drivers/tty/synclinkmp.c

   1 /*
   2  * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
   3  *
   4  * Device driver for Microgate SyncLink Multiport
   5  * high speed multiprotocol serial adapter.
   6  *
   7  * written by Paul Fulghum for Microgate Corporation
   8  * paulkf@microgate.com
   9  *
  10  * Microgate and SyncLink are trademarks of Microgate Corporation
  11  *
  12  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
  13  * This code is released under the GNU General Public License (GPL)
  14  *
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  25  * OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  29 #if defined(__i386__)
  30 #  define BREAKPOINT() asm("   int $3");
  31 #else
  32 #  define BREAKPOINT() { }
  33 #endif
  34
  35 #define MAX_DEVICES 12
  36
  37 #include <linux/module.h>
  38 #include <linux/errno.h>
  39 #include <linux/signal.h>
  40 #include <linux/sched.h>
  41 #include <linux/timer.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/pci.h>
  44 #include <linux/tty.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/serial.h>
  47 #include <linux/major.h>
  48 #include <linux/string.h>
  49 #include <linux/fcntl.h>
  50 #include <linux/ptrace.h>
  51 #include <linux/ioport.h>
  52 #include <linux/mm.h>
  53 #include <linux/seq_file.h>
  54 #include <linux/slab.h>
  55 #include <linux/netdevice.h>
  56 #include <linux/vmalloc.h>
  57 #include <linux/init.h>
  58 #include <linux/delay.h>
  59 #include <linux/ioctl.h>
  60
  61 #include <asm/io.h>
  62 #include <asm/irq.h>
  63 #include <asm/dma.h>
  64 #include <linux/bitops.h>
  65 #include <asm/types.h>
  66 #include <linux/termios.h>
  67 #include <linux/workqueue.h>
  68 #include <linux/hdlc.h>
  69 #include <linux/synclink.h>
  70
  71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
  72 #define SYNCLINK_GENERIC_HDLC 1
  73 #else
  74 #define SYNCLINK_GENERIC_HDLC 0
  75 #endif
  76
  77 #define GET_USER(error,value,addr) error = get_user(value,addr)
  78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  81
  82 #include <linux/uaccess.h>
  83
  84 static MGSL_PARAMS default_params = {
  85         MGSL_MODE_HDLC,                 /* unsigned long mode */
  86         0,                              /* unsigned char loopback; */
  87         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  88         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  89         0,                              /* unsigned long clock_speed; */
  90         0xff,                           /* unsigned char addr_filter; */
  91         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  92         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  93         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  94         9600,                           /* unsigned long data_rate; */
  95         8,                              /* unsigned char data_bits; */
  96         1,                              /* unsigned char stop_bits; */
  97         ASYNC_PARITY_NONE               /* unsigned char parity; */
  98 };
  99
 100 /* size in bytes of DMA data buffers */
 101 #define SCABUFSIZE      1024
 102 #define SCA_MEM_SIZE    0x40000
 103 #define SCA_BASE_SIZE   512
 104 #define SCA_REG_SIZE    16
 105 #define SCA_MAX_PORTS   4
 106 #define SCAMAXDESC      128
 107
 108 #define BUFFERLISTSIZE  4096
 109
 110 /* SCA-I style DMA buffer descriptor */
 111 typedef struct _SCADESC
 112 {
 113         u16     next;           /* lower l6 bits of next descriptor addr */
 114         u16     buf_ptr;        /* lower 16 bits of buffer addr */
 115         u8      buf_base;       /* upper 8 bits of buffer addr */
 116         u8      pad1;
 117         u16     length;         /* length of buffer */
 118         u8      status;         /* status of buffer */
 119         u8      pad2;
 120 } SCADESC, *PSCADESC;
 121
 122 typedef struct _SCADESC_EX
 123 {
 124         /* device driver bookkeeping section */
 125         char    *virt_addr;     /* virtual address of data buffer */
 126         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
 127 } SCADESC_EX, *PSCADESC_EX;
 128
 129 /* The queue of BH actions to be performed */
 130
 131 #define BH_RECEIVE  1
 132 #define BH_TRANSMIT 2
 133 #define BH_STATUS   4
 134
 135 #define IO_PIN_SHUTDOWN_LIMIT 100
 136
 137 struct  _input_signal_events {
 138         int     ri_up;
 139         int     ri_down;
 140         int     dsr_up;
 141         int     dsr_down;
 142         int     dcd_up;
 143         int     dcd_down;
 144         int     cts_up;
 145         int     cts_down;
 146 };
 147
 148 /*
 149  * Device instance data structure
 150  */
 151 typedef struct _synclinkmp_info {
 152         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
 153         int                     magic;
 154         struct tty_port         port;
 155         int                     line;
 156         unsigned short          close_delay;
 157         unsigned short          closing_wait;   /* time to wait before closing */
 158
 159         struct mgsl_icount      icount;
 160
 161         int                     timeout;
 162         int                     x_char;         /* xon/xoff character */
 163         u16                     read_status_mask1;  /* break detection (SR1 indications) */
 164         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
 165         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
 166         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
 167         unsigned char           *tx_buf;
 168         int                     tx_put;
 169         int                     tx_get;
 170         int                     tx_count;
 171
 172         wait_queue_head_t       status_event_wait_q;
 173         wait_queue_head_t       event_wait_q;
 174         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 175         struct _synclinkmp_info *next_device;   /* device list link */
 176         struct timer_list       status_timer;   /* input signal status check timer */
 177
 178         spinlock_t lock;                /* spinlock for synchronizing with ISR */
 179         struct work_struct task;                        /* task structure for scheduling bh */
 180
 181         u32 max_frame_size;                     /* as set by device config */
 182
 183         u32 pending_bh;
 184
 185         bool bh_running;                                /* Protection from multiple */
 186         int isr_overflow;
 187         bool bh_requested;
 188
 189         int dcd_chkcount;                       /* check counts to prevent */
 190         int cts_chkcount;                       /* too many IRQs if a signal */
 191         int dsr_chkcount;                       /* is floating */
 192         int ri_chkcount;
 193
 194         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
 195         unsigned long buffer_list_phys;
 196
 197         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
 198         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
 199         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
 200         unsigned int current_rx_buf;
 201
 202         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
 203         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
 204         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
 205         unsigned int last_tx_buf;
 206
 207         unsigned char *tmp_rx_buf;
 208         unsigned int tmp_rx_buf_count;
 209
 210         bool rx_enabled;
 211         bool rx_overflow;
 212
 213         bool tx_enabled;
 214         bool tx_active;
 215         u32 idle_mode;
 216
 217         unsigned char ie0_value;
 218         unsigned char ie1_value;
 219         unsigned char ie2_value;
 220         unsigned char ctrlreg_value;
 221         unsigned char old_signals;
 222
 223         char device_name[25];                   /* device instance name */
 224
 225         int port_count;
 226         int adapter_num;
 227         int port_num;
 228
 229         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
 230
 231         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
 232
 233         unsigned int irq_level;                 /* interrupt level */
 234         unsigned long irq_flags;
 235         bool irq_requested;                     /* true if IRQ requested */
 236
 237         MGSL_PARAMS params;                     /* communications parameters */
 238
 239         unsigned char serial_signals;           /* current serial signal states */
 240
 241         bool irq_occurred;                      /* for diagnostics use */
 242         unsigned int init_error;                /* Initialization startup error */
 243
 244         u32 last_mem_alloc;
 245         unsigned char* memory_base;             /* shared memory address (PCI only) */
 246         u32 phys_memory_base;
 247         int shared_mem_requested;
 248
 249         unsigned char* sca_base;                /* HD64570 SCA Memory address */
 250         u32 phys_sca_base;
 251         u32 sca_offset;
 252         bool sca_base_requested;
 253
 254         unsigned char* lcr_base;                /* local config registers (PCI only) */
 255         u32 phys_lcr_base;
 256         u32 lcr_offset;
 257         int lcr_mem_requested;
 258
 259         unsigned char* statctrl_base;           /* status/control register memory */
 260         u32 phys_statctrl_base;
 261         u32 statctrl_offset;
 262         bool sca_statctrl_requested;
 263
 264         u32 misc_ctrl_value;
 265         char *flag_buf;
 266         bool drop_rts_on_tx_done;
 267
 268         struct  _input_signal_events    input_signal_events;
 269
 270         /* SPPP/Cisco HDLC device parts */
 271         int netcount;
 272         spinlock_t netlock;
 273
 274 #if SYNCLINK_GENERIC_HDLC
 275         struct net_device *netdev;
 276 #endif
 277
 278 } SLMP_INFO;
 279
 280 #define MGSL_MAGIC 0x5401
 281
 282 /*
 283  * define serial signal status change macros
 284  */
 285 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
 286 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
 287 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
 288 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
 289
 290 /* Common Register macros */
 291 #define LPR     0x00
 292 #define PABR0   0x02
 293 #define PABR1   0x03
 294 #define WCRL    0x04
 295 #define WCRM    0x05
 296 #define WCRH    0x06
 297 #define DPCR    0x08
 298 #define DMER    0x09
 299 #define ISR0    0x10
 300 #define ISR1    0x11
 301 #define ISR2    0x12
 302 #define IER0    0x14
 303 #define IER1    0x15
 304 #define IER2    0x16
 305 #define ITCR    0x18
 306 #define INTVR   0x1a
 307 #define IMVR    0x1c
 308
 309 /* MSCI Register macros */
 310 #define TRB     0x20
 311 #define TRBL    0x20
 312 #define TRBH    0x21
 313 #define SR0     0x22
 314 #define SR1     0x23
 315 #define SR2     0x24
 316 #define SR3     0x25
 317 #define FST     0x26
 318 #define IE0     0x28
 319 #define IE1     0x29
 320 #define IE2     0x2a
 321 #define FIE     0x2b
 322 #define CMD     0x2c
 323 #define MD0     0x2e
 324 #define MD1     0x2f
 325 #define MD2     0x30
 326 #define CTL     0x31
 327 #define SA0     0x32
 328 #define SA1     0x33
 329 #define IDL     0x34
 330 #define TMC     0x35
 331 #define RXS     0x36
 332 #define TXS     0x37
 333 #define TRC0    0x38
 334 #define TRC1    0x39
 335 #define RRC     0x3a
 336 #define CST0    0x3c
 337 #define CST1    0x3d
 338
 339 /* Timer Register Macros */
 340 #define TCNT    0x60
 341 #define TCNTL   0x60
 342 #define TCNTH   0x61
 343 #define TCONR   0x62
 344 #define TCONRL  0x62
 345 #define TCONRH  0x63
 346 #define TMCS    0x64
 347 #define TEPR    0x65
 348
 349 /* DMA Controller Register macros */
 350 #define DARL    0x80
 351 #define DARH    0x81
 352 #define DARB    0x82
 353 #define BAR     0x80
 354 #define BARL    0x80
 355 #define BARH    0x81
 356 #define BARB    0x82
 357 #define SAR     0x84
 358 #define SARL    0x84
 359 #define SARH    0x85
 360 #define SARB    0x86
 361 #define CPB     0x86
 362 #define CDA     0x88
 363 #define CDAL    0x88
 364 #define CDAH    0x89
 365 #define EDA     0x8a
 366 #define EDAL    0x8a
 367 #define EDAH    0x8b
 368 #define BFL     0x8c
 369 #define BFLL    0x8c
 370 #define BFLH    0x8d
 371 #define BCR     0x8e
 372 #define BCRL    0x8e
 373 #define BCRH    0x8f
 374 #define DSR     0x90
 375 #define DMR     0x91
 376 #define FCT     0x93
 377 #define DIR     0x94
 378 #define DCMD    0x95
 379
 380 /* combine with timer or DMA register address */
 381 #define TIMER0  0x00
 382 #define TIMER1  0x08
 383 #define TIMER2  0x10
 384 #define TIMER3  0x18
 385 #define RXDMA   0x00
 386 #define TXDMA   0x20
 387
 388 /* SCA Command Codes */
 389 #define NOOP            0x00
 390 #define TXRESET         0x01
 391 #define TXENABLE        0x02
 392 #define TXDISABLE       0x03
 393 #define TXCRCINIT       0x04
 394 #define TXCRCEXCL       0x05
 395 #define TXEOM           0x06
 396 #define TXABORT         0x07
 397 #define MPON            0x08
 398 #define TXBUFCLR        0x09
 399 #define RXRESET         0x11
 400 #define RXENABLE        0x12
 401 #define RXDISABLE       0x13
 402 #define RXCRCINIT       0x14
 403 #define RXREJECT        0x15
 404 #define SEARCHMP        0x16
 405 #define RXCRCEXCL       0x17
 406 #define RXCRCCALC       0x18
 407 #define CHRESET         0x21
 408 #define HUNT            0x31
 409
 410 /* DMA command codes */
 411 #define SWABORT         0x01
 412 #define FEICLEAR        0x02
 413
 414 /* IE0 */
 415 #define TXINTE          BIT7
 416 #define RXINTE          BIT6
 417 #define TXRDYE          BIT1
 418 #define RXRDYE          BIT0
 419
 420 /* IE1 & SR1 */
 421 #define UDRN    BIT7
 422 #define IDLE    BIT6
 423 #define SYNCD   BIT4
 424 #define FLGD    BIT4
 425 #define CCTS    BIT3
 426 #define CDCD    BIT2
 427 #define BRKD    BIT1
 428 #define ABTD    BIT1
 429 #define GAPD    BIT1
 430 #define BRKE    BIT0
 431 #define IDLD    BIT0
 432
 433 /* IE2 & SR2 */
 434 #define EOM     BIT7
 435 #define PMP     BIT6
 436 #define SHRT    BIT6
 437 #define PE      BIT5
 438 #define ABT     BIT5
 439 #define FRME    BIT4
 440 #define RBIT    BIT4
 441 #define OVRN    BIT3
 442 #define CRCE    BIT2
 443
 444
 445 /*
 446  * Global linked list of SyncLink devices
 447  */
 448 static SLMP_INFO *synclinkmp_device_list = NULL;
 449 static int synclinkmp_adapter_count = -1;
 450 static int synclinkmp_device_count = 0;
 451
 452 /*
 453  * Set this param to non-zero to load eax with the
 454  * .text section address and breakpoint on module load.
 455  * This is useful for use with gdb and add-symbol-file command.
 456  */
 457 static bool break_on_load = 0;
 458
 459 /*
 460  * Driver major number, defaults to zero to get auto
 461  * assigned major number. May be forced as module parameter.
 462  */
 463 static int ttymajor = 0;
 464
 465 /*
 466  * Array of user specified options for ISA adapters.
 467  */
 468 static int debug_level = 0;
 469 static int maxframe[MAX_DEVICES] = {0,};
 470
 471 module_param(break_on_load, bool, 0);
 472 module_param(ttymajor, int, 0);
 473 module_param(debug_level, int, 0);
 474 module_param_array(maxframe, int, NULL, 0);
 475
 476 static char *driver_name = "SyncLink MultiPort driver";
 477 static char *driver_version = "$Revision: 4.38 $";
 478
 479 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 480 static void synclinkmp_remove_one(struct pci_dev *dev);
 481
 482 static struct pci_device_id synclinkmp_pci_tbl[] = {
 483         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 484         { 0, }, /* terminate list */
 485 };
 486 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
 487
 488 MODULE_LICENSE("GPL");
 489
 490 static struct pci_driver synclinkmp_pci_driver = {
 491         .name           = "synclinkmp",
 492         .id_table       = synclinkmp_pci_tbl,
 493         .probe          = synclinkmp_init_one,
 494         .remove         = synclinkmp_remove_one,
 495 };
 496
 497
 498 static struct tty_driver *serial_driver;
 499
 500 /* number of characters left in xmit buffer before we ask for more */
 501 #define WAKEUP_CHARS 256
 502
 503
 504 /* tty callbacks */
 505
 506 static int  open(struct tty_struct *tty, struct file * filp);
 507 static void close(struct tty_struct *tty, struct file * filp);
 508 static void hangup(struct tty_struct *tty);
 509 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 510
 511 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 512 static int put_char(struct tty_struct *tty, unsigned char ch);
 513 static void send_xchar(struct tty_struct *tty, char ch);
 514 static void wait_until_sent(struct tty_struct *tty, int timeout);
 515 static int  write_room(struct tty_struct *tty);
 516 static void flush_chars(struct tty_struct *tty);
 517 static void flush_buffer(struct tty_struct *tty);
 518 static void tx_hold(struct tty_struct *tty);
 519 static void tx_release(struct tty_struct *tty);
 520
 521 static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
 522 static int  chars_in_buffer(struct tty_struct *tty);
 523 static void throttle(struct tty_struct * tty);
 524 static void unthrottle(struct tty_struct * tty);
 525 static int set_break(struct tty_struct *tty, int break_state);
 526
 527 #if SYNCLINK_GENERIC_HDLC
 528 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 529 static void hdlcdev_tx_done(SLMP_INFO *info);
 530 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
 531 static int  hdlcdev_init(SLMP_INFO *info);
 532 static void hdlcdev_exit(SLMP_INFO *info);
 533 #endif
 534
 535 /* ioctl handlers */
 536
 537 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
 538 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 539 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 540 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
 541 static int  set_txidle(SLMP_INFO *info, int idle_mode);
 542 static int  tx_enable(SLMP_INFO *info, int enable);
 543 static int  tx_abort(SLMP_INFO *info);
 544 static int  rx_enable(SLMP_INFO *info, int enable);
 545 static int  modem_input_wait(SLMP_INFO *info,int arg);
 546 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 547 static int  tiocmget(struct tty_struct *tty);
 548 static int  tiocmset(struct tty_struct *tty,
 549                         unsigned int set, unsigned int clear);
 550 static int  set_break(struct tty_struct *tty, int break_state);
 551
 552 static int  add_device(SLMP_INFO *info);
 553 static int  device_init(int adapter_num, struct pci_dev *pdev);
 554 static int  claim_resources(SLMP_INFO *info);
 555 static void release_resources(SLMP_INFO *info);
 556
 557 static int  startup(SLMP_INFO *info);
 558 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
 559 static int carrier_raised(struct tty_port *port);
 560 static void shutdown(SLMP_INFO *info);
 561 static void program_hw(SLMP_INFO *info);
 562 static void change_params(SLMP_INFO *info);
 563
 564 static bool init_adapter(SLMP_INFO *info);
 565 static bool register_test(SLMP_INFO *info);
 566 static bool irq_test(SLMP_INFO *info);
 567 static bool loopback_test(SLMP_INFO *info);
 568 static int  adapter_test(SLMP_INFO *info);
 569 static bool memory_test(SLMP_INFO *info);
 570
 571 static void reset_adapter(SLMP_INFO *info);
 572 static void reset_port(SLMP_INFO *info);
 573 static void async_mode(SLMP_INFO *info);
 574 static void hdlc_mode(SLMP_INFO *info);
 575
 576 static void rx_stop(SLMP_INFO *info);
 577 static void rx_start(SLMP_INFO *info);
 578 static void rx_reset_buffers(SLMP_INFO *info);
 579 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
 580 static bool rx_get_frame(SLMP_INFO *info);
 581
 582 static void tx_start(SLMP_INFO *info);
 583 static void tx_stop(SLMP_INFO *info);
 584 static void tx_load_fifo(SLMP_INFO *info);
 585 static void tx_set_idle(SLMP_INFO *info);
 586 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
 587
 588 static void get_signals(SLMP_INFO *info);
 589 static void set_signals(SLMP_INFO *info);
 590 static void enable_loopback(SLMP_INFO *info, int enable);
 591 static void set_rate(SLMP_INFO *info, u32 data_rate);
 592
 593 static int  bh_action(SLMP_INFO *info);
 594 static void bh_handler(struct work_struct *work);
 595 static void bh_receive(SLMP_INFO *info);
 596 static void bh_transmit(SLMP_INFO *info);
 597 static void bh_status(SLMP_INFO *info);
 598 static void isr_timer(SLMP_INFO *info);
 599 static void isr_rxint(SLMP_INFO *info);
 600 static void isr_rxrdy(SLMP_INFO *info);
 601 static void isr_txint(SLMP_INFO *info);
 602 static void isr_txrdy(SLMP_INFO *info);
 603 static void isr_rxdmaok(SLMP_INFO *info);
 604 static void isr_rxdmaerror(SLMP_INFO *info);
 605 static void isr_txdmaok(SLMP_INFO *info);
 606 static void isr_txdmaerror(SLMP_INFO *info);
 607 static void isr_io_pin(SLMP_INFO *info, u16 status);
 608
 609 static int  alloc_dma_bufs(SLMP_INFO *info);
 610 static void free_dma_bufs(SLMP_INFO *info);
 611 static int  alloc_buf_list(SLMP_INFO *info);
 612 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
 613 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
 614 static void free_tmp_rx_buf(SLMP_INFO *info);
 615
 616 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
 617 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
 618 static void tx_timeout(unsigned long context);
 619 static void status_timeout(unsigned long context);
 620
 621 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
 622 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
 623 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
 624 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
 625 static unsigned char read_status_reg(SLMP_INFO * info);
 626 static void write_control_reg(SLMP_INFO * info);
 627
 628
 629 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
 630 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
 631 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
 632
 633 static u32 misc_ctrl_value = 0x007e4040;
 634 static u32 lcr1_brdr_value = 0x00800028;
 635
 636 static u32 read_ahead_count = 8;
 637
 638 /* DPCR, DMA Priority Control
 639  *
 640  * 07..05  Not used, must be 0
 641  * 04      BRC, bus release condition: 0=all transfers complete
 642  *              1=release after 1 xfer on all channels
 643  * 03      CCC, channel change condition: 0=every cycle
 644  *              1=after each channel completes all xfers
 645  * 02..00  PR<2..0>, priority 100=round robin
 646  *
 647  * 00000100 = 0x00
 648  */
 649 static unsigned char dma_priority = 0x04;
 650
 651 // Number of bytes that can be written to shared RAM
 652 // in a single write operation
 653 static u32 sca_pci_load_interval = 64;
 654
 655 /*
 656  * 1st function defined in .text section. Calling this function in
 657  * init_module() followed by a breakpoint allows a remote debugger
 658  * (gdb) to get the .text address for the add-symbol-file command.
 659  * This allows remote debugging of dynamically loadable modules.
 660  */
 661 static void* synclinkmp_get_text_ptr(void);
 662 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
 663
 664 static inline int sanity_check(SLMP_INFO *info,
 665                                char *name, const char *routine)
 666 {
 667 #ifdef SANITY_CHECK
 668         static const char *badmagic =
 669                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
 670         static const char *badinfo =
 671                 "Warning: null synclinkmp_struct for (%s) in %s\n";
 672
 673         if (!info) {
 674                 printk(badinfo, name, routine);
 675                 return 1;
 676         }
 677         if (info->magic != MGSL_MAGIC) {
 678                 printk(badmagic, name, routine);
 679                 return 1;
 680         }
 681 #else
 682         if (!info)
 683                 return 1;
 684 #endif
 685         return 0;
 686 }
 687
 688 /**
 689  * line discipline callback wrappers
 690  *
 691  * The wrappers maintain line discipline references
 692  * while calling into the line discipline.
 693  *
 694  * ldisc_receive_buf  - pass receive data to line discipline
 695  */
 696
 697 static void ldisc_receive_buf(struct tty_struct *tty,
 698                               const __u8 *data, char *flags, int count)
 699 {
 700         struct tty_ldisc *ld;
 701         if (!tty)
 702                 return;
 703         ld = tty_ldisc_ref(tty);
 704         if (ld) {
 705                 if (ld->ops->receive_buf)
 706                         ld->ops->receive_buf(tty, data, flags, count);
 707                 tty_ldisc_deref(ld);
 708         }
 709 }
 710
 711 /* tty callbacks */
 712
 713 static int install(struct tty_driver *driver, struct tty_struct *tty)
 714 {
 715         SLMP_INFO *info;
 716         int line = tty->index;
 717
 718         if (line >= synclinkmp_device_count) {
 719                 printk("%s(%d): open with invalid line #%d.\n",
 720                         __FILE__,__LINE__,line);
 721                 return -ENODEV;
 722         }
 723
 724         info = synclinkmp_device_list;
 725         while (info && info->line != line)
 726                 info = info->next_device;
 727         if (sanity_check(info, tty->name, "open"))
 728                 return -ENODEV;
 729         if (info->init_error) {
 730                 printk("%s(%d):%s device is not allocated, init error=%d\n",
 731                         __FILE__, __LINE__, info->device_name,
 732                         info->init_error);
 733                 return -ENODEV;
 734         }
 735
 736         tty->driver_data = info;
 737
 738         return tty_port_install(&info->port, driver, tty);
 739 }
 740
 741 /* Called when a port is opened.  Init and enable port.
 742  */
 743 static int open(struct tty_struct *tty, struct file *filp)
 744 {
 745         SLMP_INFO *info = tty->driver_data;
 746         unsigned long flags;
 747         int retval;
 748
 749         info->port.tty = tty;
 750
 751         if (debug_level >= DEBUG_LEVEL_INFO)
 752                 printk("%s(%d):%s open(), old ref count = %d\n",
 753                          __FILE__,__LINE__,tty->driver->name, info->port.count);
 754
 755         info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 756
 757         spin_lock_irqsave(&info->netlock, flags);
 758         if (info->netcount) {
 759                 retval = -EBUSY;
 760                 spin_unlock_irqrestore(&info->netlock, flags);
 761                 goto cleanup;
 762         }
 763         info->port.count++;
 764         spin_unlock_irqrestore(&info->netlock, flags);
 765
 766         if (info->port.count == 1) {
 767                 /* 1st open on this device, init hardware */
 768                 retval = startup(info);
 769                 if (retval < 0)
 770                         goto cleanup;
 771         }
 772
 773         retval = block_til_ready(tty, filp, info);
 774         if (retval) {
 775                 if (debug_level >= DEBUG_LEVEL_INFO)
 776                         printk("%s(%d):%s block_til_ready() returned %d\n",
 777                                  __FILE__,__LINE__, info->device_name, retval);
 778                 goto cleanup;
 779         }
 780
 781         if (debug_level >= DEBUG_LEVEL_INFO)
 782                 printk("%s(%d):%s open() success\n",
 783                          __FILE__,__LINE__, info->device_name);
 784         retval = 0;
 785
 786 cleanup:
 787         if (retval) {
 788                 if (tty->count == 1)
 789                         info->port.tty = NULL; /* tty layer will release tty struct */
 790                 if(info->port.count)
 791                         info->port.count--;
 792         }
 793
 794         return retval;
 795 }
 796
 797 /* Called when port is closed. Wait for remaining data to be
 798  * sent. Disable port and free resources.
 799  */
 800 static void close(struct tty_struct *tty, struct file *filp)
 801 {
 802         SLMP_INFO * info = tty->driver_data;
 803
 804         if (sanity_check(info, tty->name, "close"))
 805                 return;
 806
 807         if (debug_level >= DEBUG_LEVEL_INFO)
 808                 printk("%s(%d):%s close() entry, count=%d\n",
 809                          __FILE__,__LINE__, info->device_name, info->port.count);
 810
 811         if (tty_port_close_start(&info->port, tty, filp) == 0)
 812                 goto cleanup;
 813
 814         mutex_lock(&info->port.mutex);
 815         if (tty_port_initialized(&info->port))
 816                 wait_until_sent(tty, info->timeout);
 817
 818         flush_buffer(tty);
 819         tty_ldisc_flush(tty);
 820         shutdown(info);
 821         mutex_unlock(&info->port.mutex);
 822
 823         tty_port_close_end(&info->port, tty);
 824         info->port.tty = NULL;
 825 cleanup:
 826         if (debug_level >= DEBUG_LEVEL_INFO)
 827                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
 828                         tty->driver->name, info->port.count);
 829 }
 830
 831 /* Called by tty_hangup() when a hangup is signaled.
 832  * This is the same as closing all open descriptors for the port.
 833  */
 834 static void hangup(struct tty_struct *tty)
 835 {
 836         SLMP_INFO *info = tty->driver_data;
 837         unsigned long flags;
 838
 839         if (debug_level >= DEBUG_LEVEL_INFO)
 840                 printk("%s(%d):%s hangup()\n",
 841                          __FILE__,__LINE__, info->device_name );
 842
 843         if (sanity_check(info, tty->name, "hangup"))
 844                 return;
 845
 846         mutex_lock(&info->port.mutex);
 847         flush_buffer(tty);
 848         shutdown(info);
 849
 850         spin_lock_irqsave(&info->port.lock, flags);
 851         info->port.count = 0;
 852         info->port.tty = NULL;
 853         spin_unlock_irqrestore(&info->port.lock, flags);
 854         tty_port_set_active(&info->port, 1);
 855         mutex_unlock(&info->port.mutex);
 856
 857         wake_up_interruptible(&info->port.open_wait);
 858 }
 859
 860 /* Set new termios settings
 861  */
 862 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 863 {
 864         SLMP_INFO *info = tty->driver_data;
 865         unsigned long flags;
 866
 867         if (debug_level >= DEBUG_LEVEL_INFO)
 868                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
 869                         tty->driver->name );
 870
 871         change_params(info);
 872
 873         /* Handle transition to B0 status */
 874         if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
 875                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
 876                 spin_lock_irqsave(&info->lock,flags);
 877                 set_signals(info);
 878                 spin_unlock_irqrestore(&info->lock,flags);
 879         }
 880
 881         /* Handle transition away from B0 status */
 882         if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
 883                 info->serial_signals |= SerialSignal_DTR;
 884                 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
 885                         info->serial_signals |= SerialSignal_RTS;
 886                 spin_lock_irqsave(&info->lock,flags);
 887                 set_signals(info);
 888                 spin_unlock_irqrestore(&info->lock,flags);
 889         }
 890
 891         /* Handle turning off CRTSCTS */
 892         if (old_termios->c_cflag & CRTSCTS && !C_CRTSCTS(tty)) {
 893                 tty->hw_stopped = 0;
 894                 tx_release(tty);
 895         }
 896 }
 897
 898 /* Send a block of data
 899  *
 900  * Arguments:
 901  *
 902  *      tty             pointer to tty information structure
 903  *      buf             pointer to buffer containing send data
 904  *      count           size of send data in bytes
 905  *
 906  * Return Value:        number of characters written
 907  */
 908 static int write(struct tty_struct *tty,
 909                  const unsigned char *buf, int count)
 910 {
 911         int     c, ret = 0;
 912         SLMP_INFO *info = tty->driver_data;
 913         unsigned long flags;
 914
 915         if (debug_level >= DEBUG_LEVEL_INFO)
 916                 printk("%s(%d):%s write() count=%d\n",
 917                        __FILE__,__LINE__,info->device_name,count);
 918
 919         if (sanity_check(info, tty->name, "write"))
 920                 goto cleanup;
 921
 922         if (!info->tx_buf)
 923                 goto cleanup;
 924
 925         if (info->params.mode == MGSL_MODE_HDLC) {
 926                 if (count > info->max_frame_size) {
 927                         ret = -EIO;
 928                         goto cleanup;
 929                 }
 930                 if (info->tx_active)
 931                         goto cleanup;
 932                 if (info->tx_count) {
 933                         /* send accumulated data from send_char() calls */
 934                         /* as frame and wait before accepting more data. */
 935                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
 936                         goto start;
 937                 }
 938                 ret = info->tx_count = count;
 939                 tx_load_dma_buffer(info, buf, count);
 940                 goto start;
 941         }
 942
 943         for (;;) {
 944                 c = min_t(int, count,
 945                         min(info->max_frame_size - info->tx_count - 1,
 946                             info->max_frame_size - info->tx_put));
 947                 if (c <= 0)
 948                         break;
 949
 950                 memcpy(info->tx_buf + info->tx_put, buf, c);
 951
 952                 spin_lock_irqsave(&info->lock,flags);
 953                 info->tx_put += c;
 954                 if (info->tx_put >= info->max_frame_size)
 955                         info->tx_put -= info->max_frame_size;
 956                 info->tx_count += c;
 957                 spin_unlock_irqrestore(&info->lock,flags);
 958
 959                 buf += c;
 960                 count -= c;
 961                 ret += c;
 962         }
 963
 964         if (info->params.mode == MGSL_MODE_HDLC) {
 965                 if (count) {
 966                         ret = info->tx_count = 0;
 967                         goto cleanup;
 968                 }
 969                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
 970         }
 971 start:
 972         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
 973                 spin_lock_irqsave(&info->lock,flags);
 974                 if (!info->tx_active)
 975                         tx_start(info);
 976                 spin_unlock_irqrestore(&info->lock,flags);
 977         }
 978
 979 cleanup:
 980         if (debug_level >= DEBUG_LEVEL_INFO)
 981                 printk( "%s(%d):%s write() returning=%d\n",
 982                         __FILE__,__LINE__,info->device_name,ret);
 983         return ret;
 984 }
 985
 986 /* Add a character to the transmit buffer.
 987  */
 988 static int put_char(struct tty_struct *tty, unsigned char ch)
 989 {
 990         SLMP_INFO *info = tty->driver_data;
 991         unsigned long flags;
 992         int ret = 0;
 993
 994         if ( debug_level >= DEBUG_LEVEL_INFO ) {
 995                 printk( "%s(%d):%s put_char(%d)\n",
 996                         __FILE__,__LINE__,info->device_name,ch);
 997         }
 998
 999         if (sanity_check(info, tty->name, "put_char"))
1000                 return 0;
1001
1002         if (!info->tx_buf)
1003                 return 0;
1004
1005         spin_lock_irqsave(&info->lock,flags);
1006
1007         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1008              !info->tx_active ) {
1009
1010                 if (info->tx_count < info->max_frame_size - 1) {
1011                         info->tx_buf[info->tx_put++] = ch;
1012                         if (info->tx_put >= info->max_frame_size)
1013                                 info->tx_put -= info->max_frame_size;
1014                         info->tx_count++;
1015                         ret = 1;
1016                 }
1017         }
1018
1019         spin_unlock_irqrestore(&info->lock,flags);
1020         return ret;
1021 }
1022
1023 /* Send a high-priority XON/XOFF character
1024  */
1025 static void send_xchar(struct tty_struct *tty, char ch)
1026 {
1027         SLMP_INFO *info = tty->driver_data;
1028         unsigned long flags;
1029
1030         if (debug_level >= DEBUG_LEVEL_INFO)
1031                 printk("%s(%d):%s send_xchar(%d)\n",
1032                          __FILE__,__LINE__, info->device_name, ch );
1033
1034         if (sanity_check(info, tty->name, "send_xchar"))
1035                 return;
1036
1037         info->x_char = ch;
1038         if (ch) {
1039                 /* Make sure transmit interrupts are on */
1040                 spin_lock_irqsave(&info->lock,flags);
1041                 if (!info->tx_enabled)
1042                         tx_start(info);
1043                 spin_unlock_irqrestore(&info->lock,flags);
1044         }
1045 }
1046
1047 /* Wait until the transmitter is empty.
1048  */
1049 static void wait_until_sent(struct tty_struct *tty, int timeout)
1050 {
1051         SLMP_INFO * info = tty->driver_data;
1052         unsigned long orig_jiffies, char_time;
1053
1054         if (!info )
1055                 return;
1056
1057         if (debug_level >= DEBUG_LEVEL_INFO)
1058                 printk("%s(%d):%s wait_until_sent() entry\n",
1059                          __FILE__,__LINE__, info->device_name );
1060
1061         if (sanity_check(info, tty->name, "wait_until_sent"))
1062                 return;
1063
1064         if (!tty_port_initialized(&info->port))
1065                 goto exit;
1066
1067         orig_jiffies = jiffies;
1068
1069         /* Set check interval to 1/5 of estimated time to
1070          * send a character, and make it at least 1. The check
1071          * interval should also be less than the timeout.
1072          * Note: use tight timings here to satisfy the NIST-PCTS.
1073          */
1074
1075         if ( info->params.data_rate ) {
1076                 char_time = info->timeout/(32 * 5);
1077                 if (!char_time)
1078                         char_time++;
1079         } else
1080                 char_time = 1;
1081
1082         if (timeout)
1083                 char_time = min_t(unsigned long, char_time, timeout);
1084
1085         if ( info->params.mode == MGSL_MODE_HDLC ) {
1086                 while (info->tx_active) {
1087                         msleep_interruptible(jiffies_to_msecs(char_time));
1088                         if (signal_pending(current))
1089                                 break;
1090                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1091                                 break;
1092                 }
1093         } else {
1094                 /*
1095                  * TODO: determine if there is something similar to USC16C32
1096                  *       TXSTATUS_ALL_SENT status
1097                  */
1098                 while ( info->tx_active && info->tx_enabled) {
1099                         msleep_interruptible(jiffies_to_msecs(char_time));
1100                         if (signal_pending(current))
1101                                 break;
1102                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1103                                 break;
1104                 }
1105         }
1106
1107 exit:
1108         if (debug_level >= DEBUG_LEVEL_INFO)
1109                 printk("%s(%d):%s wait_until_sent() exit\n",
1110                          __FILE__,__LINE__, info->device_name );
1111 }
1112
1113 /* Return the count of free bytes in transmit buffer
1114  */
1115 static int write_room(struct tty_struct *tty)
1116 {
1117         SLMP_INFO *info = tty->driver_data;
1118         int ret;
1119
1120         if (sanity_check(info, tty->name, "write_room"))
1121                 return 0;
1122
1123         if (info->params.mode == MGSL_MODE_HDLC) {
1124                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1125         } else {
1126                 ret = info->max_frame_size - info->tx_count - 1;
1127                 if (ret < 0)
1128                         ret = 0;
1129         }
1130
1131         if (debug_level >= DEBUG_LEVEL_INFO)
1132                 printk("%s(%d):%s write_room()=%d\n",
1133                        __FILE__, __LINE__, info->device_name, ret);
1134
1135         return ret;
1136 }
1137
1138 /* enable transmitter and send remaining buffered characters
1139  */
1140 static void flush_chars(struct tty_struct *tty)
1141 {
1142         SLMP_INFO *info = tty->driver_data;
1143         unsigned long flags;
1144
1145         if ( debug_level >= DEBUG_LEVEL_INFO )
1146                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1147                         __FILE__,__LINE__,info->device_name,info->tx_count);
1148
1149         if (sanity_check(info, tty->name, "flush_chars"))
1150                 return;
1151
1152         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1153             !info->tx_buf)
1154                 return;
1155
1156         if ( debug_level >= DEBUG_LEVEL_INFO )
1157                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1158                         __FILE__,__LINE__,info->device_name );
1159
1160         spin_lock_irqsave(&info->lock,flags);
1161
1162         if (!info->tx_active) {
1163                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1164                         info->tx_count ) {
1165                         /* operating in synchronous (frame oriented) mode */
1166                         /* copy data from circular tx_buf to */
1167                         /* transmit DMA buffer. */
1168                         tx_load_dma_buffer(info,
1169                                  info->tx_buf,info->tx_count);
1170                 }
1171                 tx_start(info);
1172         }
1173
1174         spin_unlock_irqrestore(&info->lock,flags);
1175 }
1176
1177 /* Discard all data in the send buffer
1178  */
1179 static void flush_buffer(struct tty_struct *tty)
1180 {
1181         SLMP_INFO *info = tty->driver_data;
1182         unsigned long flags;
1183
1184         if (debug_level >= DEBUG_LEVEL_INFO)
1185                 printk("%s(%d):%s flush_buffer() entry\n",
1186                          __FILE__,__LINE__, info->device_name );
1187
1188         if (sanity_check(info, tty->name, "flush_buffer"))
1189                 return;
1190
1191         spin_lock_irqsave(&info->lock,flags);
1192         info->tx_count = info->tx_put = info->tx_get = 0;
1193         del_timer(&info->tx_timer);
1194         spin_unlock_irqrestore(&info->lock,flags);
1195
1196         tty_wakeup(tty);
1197 }
1198
1199 /* throttle (stop) transmitter
1200  */
1201 static void tx_hold(struct tty_struct *tty)
1202 {
1203         SLMP_INFO *info = tty->driver_data;
1204         unsigned long flags;
1205
1206         if (sanity_check(info, tty->name, "tx_hold"))
1207                 return;
1208
1209         if ( debug_level >= DEBUG_LEVEL_INFO )
1210                 printk("%s(%d):%s tx_hold()\n",
1211                         __FILE__,__LINE__,info->device_name);
1212
1213         spin_lock_irqsave(&info->lock,flags);
1214         if (info->tx_enabled)
1215                 tx_stop(info);
1216         spin_unlock_irqrestore(&info->lock,flags);
1217 }
1218
1219 /* release (start) transmitter
1220  */
1221 static void tx_release(struct tty_struct *tty)
1222 {
1223         SLMP_INFO *info = tty->driver_data;
1224         unsigned long flags;
1225
1226         if (sanity_check(info, tty->name, "tx_release"))
1227                 return;
1228
1229         if ( debug_level >= DEBUG_LEVEL_INFO )
1230                 printk("%s(%d):%s tx_release()\n",
1231                         __FILE__,__LINE__,info->device_name);
1232
1233         spin_lock_irqsave(&info->lock,flags);
1234         if (!info->tx_enabled)
1235                 tx_start(info);
1236         spin_unlock_irqrestore(&info->lock,flags);
1237 }
1238
1239 /* Service an IOCTL request
1240  *
1241  * Arguments:
1242  *
1243  *      tty     pointer to tty instance data
1244  *      cmd     IOCTL command code
1245  *      arg     command argument/context
1246  *
1247  * Return Value:        0 if success, otherwise error code
1248  */
1249 static int ioctl(struct tty_struct *tty,
1250                  unsigned int cmd, unsigned long arg)
1251 {
1252         SLMP_INFO *info = tty->driver_data;
1253         void __user *argp = (void __user *)arg;
1254
1255         if (debug_level >= DEBUG_LEVEL_INFO)
1256                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1257                         info->device_name, cmd );
1258
1259         if (sanity_check(info, tty->name, "ioctl"))
1260                 return -ENODEV;
1261
1262         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1263             (cmd != TIOCMIWAIT)) {
1264                 if (tty_io_error(tty))
1265                     return -EIO;
1266         }
1267
1268         switch (cmd) {
1269         case MGSL_IOCGPARAMS:
1270                 return get_params(info, argp);
1271         case MGSL_IOCSPARAMS:
1272                 return set_params(info, argp);
1273         case MGSL_IOCGTXIDLE:
1274                 return get_txidle(info, argp);
1275         case MGSL_IOCSTXIDLE:
1276                 return set_txidle(info, (int)arg);
1277         case MGSL_IOCTXENABLE:
1278                 return tx_enable(info, (int)arg);
1279         case MGSL_IOCRXENABLE:
1280                 return rx_enable(info, (int)arg);
1281         case MGSL_IOCTXABORT:
1282                 return tx_abort(info);
1283         case MGSL_IOCGSTATS:
1284                 return get_stats(info, argp);
1285         case MGSL_IOCWAITEVENT:
1286                 return wait_mgsl_event(info, argp);
1287         case MGSL_IOCLOOPTXDONE:
1288                 return 0; // TODO: Not supported, need to document
1289                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1290                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1291                  */
1292         case TIOCMIWAIT:
1293                 return modem_input_wait(info,(int)arg);
1294
1295                 /*
1296                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1297                  * Return: write counters to the user passed counter struct
1298                  * NB: both 1->0 and 0->1 transitions are counted except for
1299                  *     RI where only 0->1 is counted.
1300                  */
1301         default:
1302                 return -ENOIOCTLCMD;
1303         }
1304         return 0;
1305 }
1306
1307 static int get_icount(struct tty_struct *tty,
1308                                 struct serial_icounter_struct *icount)
1309 {
1310         SLMP_INFO *info = tty->driver_data;
1311         struct mgsl_icount cnow;        /* kernel counter temps */
1312         unsigned long flags;
1313
1314         spin_lock_irqsave(&info->lock,flags);
1315         cnow = info->icount;
1316         spin_unlock_irqrestore(&info->lock,flags);
1317
1318         icount->cts = cnow.cts;
1319         icount->dsr = cnow.dsr;
1320         icount->rng = cnow.rng;
1321         icount->dcd = cnow.dcd;
1322         icount->rx = cnow.rx;
1323         icount->tx = cnow.tx;
1324         icount->frame = cnow.frame;
1325         icount->overrun = cnow.overrun;
1326         icount->parity = cnow.parity;
1327         icount->brk = cnow.brk;
1328         icount->buf_overrun = cnow.buf_overrun;
1329
1330         return 0;
1331 }
1332
1333 /*
1334  * /proc fs routines....
1335  */
1336
1337 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1338 {
1339         char    stat_buf[30];
1340         unsigned long flags;
1341
1342         seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1343                        "\tIRQ=%d MaxFrameSize=%u\n",
1344                 info->device_name,
1345                 info->phys_sca_base,
1346                 info->phys_memory_base,
1347                 info->phys_statctrl_base,
1348                 info->phys_lcr_base,
1349                 info->irq_level,
1350                 info->max_frame_size );
1351
1352         /* output current serial signal states */
1353         spin_lock_irqsave(&info->lock,flags);
1354         get_signals(info);
1355         spin_unlock_irqrestore(&info->lock,flags);
1356
1357         stat_buf[0] = 0;
1358         stat_buf[1] = 0;
1359         if (info->serial_signals & SerialSignal_RTS)
1360                 strcat(stat_buf, "|RTS");
1361         if (info->serial_signals & SerialSignal_CTS)
1362                 strcat(stat_buf, "|CTS");
1363         if (info->serial_signals & SerialSignal_DTR)
1364                 strcat(stat_buf, "|DTR");
1365         if (info->serial_signals & SerialSignal_DSR)
1366                 strcat(stat_buf, "|DSR");
1367         if (info->serial_signals & SerialSignal_DCD)
1368                 strcat(stat_buf, "|CD");
1369         if (info->serial_signals & SerialSignal_RI)
1370                 strcat(stat_buf, "|RI");
1371
1372         if (info->params.mode == MGSL_MODE_HDLC) {
1373                 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1374                               info->icount.txok, info->icount.rxok);
1375                 if (info->icount.txunder)
1376                         seq_printf(m, " txunder:%d", info->icount.txunder);
1377                 if (info->icount.txabort)
1378                         seq_printf(m, " txabort:%d", info->icount.txabort);
1379                 if (info->icount.rxshort)
1380                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
1381                 if (info->icount.rxlong)
1382                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
1383                 if (info->icount.rxover)
1384                         seq_printf(m, " rxover:%d", info->icount.rxover);
1385                 if (info->icount.rxcrc)
1386                         seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1387         } else {
1388                 seq_printf(m, "\tASYNC tx:%d rx:%d",
1389                               info->icount.tx, info->icount.rx);
1390                 if (info->icount.frame)
1391                         seq_printf(m, " fe:%d", info->icount.frame);
1392                 if (info->icount.parity)
1393                         seq_printf(m, " pe:%d", info->icount.parity);
1394                 if (info->icount.brk)
1395                         seq_printf(m, " brk:%d", info->icount.brk);
1396                 if (info->icount.overrun)
1397                         seq_printf(m, " oe:%d", info->icount.overrun);
1398         }
1399
1400         /* Append serial signal status to end */
1401         seq_printf(m, " %s\n", stat_buf+1);
1402
1403         seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1404          info->tx_active,info->bh_requested,info->bh_running,
1405          info->pending_bh);
1406 }
1407
1408 /* Called to print information about devices
1409  */
1410 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1411 {
1412         SLMP_INFO *info;
1413
1414         seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1415
1416         info = synclinkmp_device_list;
1417         while( info ) {
1418                 line_info(m, info);
1419                 info = info->next_device;
1420         }
1421         return 0;
1422 }
1423
1424 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1425 {
1426         return single_open(file, synclinkmp_proc_show, NULL);
1427 }
1428
1429 static const struct file_operations synclinkmp_proc_fops = {
1430         .owner          = THIS_MODULE,
1431         .open           = synclinkmp_proc_open,
1432         .read           = seq_read,
1433         .llseek         = seq_lseek,
1434         .release        = single_release,
1435 };
1436
1437 /* Return the count of bytes in transmit buffer
1438  */
1439 static int chars_in_buffer(struct tty_struct *tty)
1440 {
1441         SLMP_INFO *info = tty->driver_data;
1442
1443         if (sanity_check(info, tty->name, "chars_in_buffer"))
1444                 return 0;
1445
1446         if (debug_level >= DEBUG_LEVEL_INFO)
1447                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1448                        __FILE__, __LINE__, info->device_name, info->tx_count);
1449
1450         return info->tx_count;
1451 }
1452
1453 /* Signal remote device to throttle send data (our receive data)
1454  */
1455 static void throttle(struct tty_struct * tty)
1456 {
1457         SLMP_INFO *info = tty->driver_data;
1458         unsigned long flags;
1459
1460         if (debug_level >= DEBUG_LEVEL_INFO)
1461                 printk("%s(%d):%s throttle() entry\n",
1462                          __FILE__,__LINE__, info->device_name );
1463
1464         if (sanity_check(info, tty->name, "throttle"))
1465                 return;
1466
1467         if (I_IXOFF(tty))
1468                 send_xchar(tty, STOP_CHAR(tty));
1469
1470         if (C_CRTSCTS(tty)) {
1471                 spin_lock_irqsave(&info->lock,flags);
1472                 info->serial_signals &= ~SerialSignal_RTS;
1473                 set_signals(info);
1474                 spin_unlock_irqrestore(&info->lock,flags);
1475         }
1476 }
1477
1478 /* Signal remote device to stop throttling send data (our receive data)
1479  */
1480 static void unthrottle(struct tty_struct * tty)
1481 {
1482         SLMP_INFO *info = tty->driver_data;
1483         unsigned long flags;
1484
1485         if (debug_level >= DEBUG_LEVEL_INFO)
1486                 printk("%s(%d):%s unthrottle() entry\n",
1487                          __FILE__,__LINE__, info->device_name );
1488
1489         if (sanity_check(info, tty->name, "unthrottle"))
1490                 return;
1491
1492         if (I_IXOFF(tty)) {
1493                 if (info->x_char)
1494                         info->x_char = 0;
1495                 else
1496                         send_xchar(tty, START_CHAR(tty));
1497         }
1498
1499         if (C_CRTSCTS(tty)) {
1500                 spin_lock_irqsave(&info->lock,flags);
1501                 info->serial_signals |= SerialSignal_RTS;
1502                 set_signals(info);
1503                 spin_unlock_irqrestore(&info->lock,flags);
1504         }
1505 }
1506
1507 /* set or clear transmit break condition
1508  * break_state  -1=set break condition, 0=clear
1509  */
1510 static int set_break(struct tty_struct *tty, int break_state)
1511 {
1512         unsigned char RegValue;
1513         SLMP_INFO * info = tty->driver_data;
1514         unsigned long flags;
1515
1516         if (debug_level >= DEBUG_LEVEL_INFO)
1517                 printk("%s(%d):%s set_break(%d)\n",
1518                          __FILE__,__LINE__, info->device_name, break_state);
1519
1520         if (sanity_check(info, tty->name, "set_break"))
1521                 return -EINVAL;
1522
1523         spin_lock_irqsave(&info->lock,flags);
1524         RegValue = read_reg(info, CTL);
1525         if (break_state == -1)
1526                 RegValue |= BIT3;
1527         else
1528                 RegValue &= ~BIT3;
1529         write_reg(info, CTL, RegValue);
1530         spin_unlock_irqrestore(&info->lock,flags);
1531         return 0;
1532 }
1533
1534 #if SYNCLINK_GENERIC_HDLC
1535
1536 /**
1537  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1538  * set encoding and frame check sequence (FCS) options
1539  *
1540  * dev       pointer to network device structure
1541  * encoding  serial encoding setting
1542  * parity    FCS setting
1543  *
1544  * returns 0 if success, otherwise error code
1545  */
1546 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1547                           unsigned short parity)
1548 {
1549         SLMP_INFO *info = dev_to_port(dev);
1550         unsigned char  new_encoding;
1551         unsigned short new_crctype;
1552
1553         /* return error if TTY interface open */
1554         if (info->port.count)
1555                 return -EBUSY;
1556
1557         switch (encoding)
1558         {
1559         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1560         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1561         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1562         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1563         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1564         default: return -EINVAL;
1565         }
1566
1567         switch (parity)
1568         {
1569         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1570         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1571         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1572         default: return -EINVAL;
1573         }
1574
1575         info->params.encoding = new_encoding;
1576         info->params.crc_type = new_crctype;
1577
1578         /* if network interface up, reprogram hardware */
1579         if (info->netcount)
1580                 program_hw(info);
1581
1582         return 0;
1583 }
1584
1585 /**
1586  * called by generic HDLC layer to send frame
1587  *
1588  * skb  socket buffer containing HDLC frame
1589  * dev  pointer to network device structure
1590  */
1591 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1592                                       struct net_device *dev)
1593 {
1594         SLMP_INFO *info = dev_to_port(dev);
1595         unsigned long flags;
1596
1597         if (debug_level >= DEBUG_LEVEL_INFO)
1598                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1599
1600         /* stop sending until this frame completes */
1601         netif_stop_queue(dev);
1602
1603         /* copy data to device buffers */
1604         info->tx_count = skb->len;
1605         tx_load_dma_buffer(info, skb->data, skb->len);
1606
1607         /* update network statistics */
1608         dev->stats.tx_packets++;
1609         dev->stats.tx_bytes += skb->len;
1610
1611         /* done with socket buffer, so free it */
1612         dev_kfree_skb(skb);
1613
1614         /* save start time for transmit timeout detection */
1615         netif_trans_update(dev);
1616
1617         /* start hardware transmitter if necessary */
1618         spin_lock_irqsave(&info->lock,flags);
1619         if (!info->tx_active)
1620                 tx_start(info);
1621         spin_unlock_irqrestore(&info->lock,flags);
1622
1623         return NETDEV_TX_OK;
1624 }
1625
1626 /**
1627  * called by network layer when interface enabled
1628  * claim resources and initialize hardware
1629  *
1630  * dev  pointer to network device structure
1631  *
1632  * returns 0 if success, otherwise error code
1633  */
1634 static int hdlcdev_open(struct net_device *dev)
1635 {
1636         SLMP_INFO *info = dev_to_port(dev);
1637         int rc;
1638         unsigned long flags;
1639
1640         if (debug_level >= DEBUG_LEVEL_INFO)
1641                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1642
1643         /* generic HDLC layer open processing */
1644         rc = hdlc_open(dev);
1645         if (rc)
1646                 return rc;
1647
1648         /* arbitrate between network and tty opens */
1649         spin_lock_irqsave(&info->netlock, flags);
1650         if (info->port.count != 0 || info->netcount != 0) {
1651                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1652                 spin_unlock_irqrestore(&info->netlock, flags);
1653                 return -EBUSY;
1654         }
1655         info->netcount=1;
1656         spin_unlock_irqrestore(&info->netlock, flags);
1657
1658         /* claim resources and init adapter */
1659         if ((rc = startup(info)) != 0) {
1660                 spin_lock_irqsave(&info->netlock, flags);
1661                 info->netcount=0;
1662                 spin_unlock_irqrestore(&info->netlock, flags);
1663                 return rc;
1664         }
1665
1666         /* assert RTS and DTR, apply hardware settings */
1667         info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1668         program_hw(info);
1669
1670         /* enable network layer transmit */
1671         netif_trans_update(dev);
1672         netif_start_queue(dev);
1673
1674         /* inform generic HDLC layer of current DCD status */
1675         spin_lock_irqsave(&info->lock, flags);
1676         get_signals(info);
1677         spin_unlock_irqrestore(&info->lock, flags);
1678         if (info->serial_signals & SerialSignal_DCD)
1679                 netif_carrier_on(dev);
1680         else
1681                 netif_carrier_off(dev);
1682         return 0;
1683 }
1684
1685 /**
1686  * called by network layer when interface is disabled
1687  * shutdown hardware and release resources
1688  *
1689  * dev  pointer to network device structure
1690  *
1691  * returns 0 if success, otherwise error code
1692  */
1693 static int hdlcdev_close(struct net_device *dev)
1694 {
1695         SLMP_INFO *info = dev_to_port(dev);
1696         unsigned long flags;
1697
1698         if (debug_level >= DEBUG_LEVEL_INFO)
1699                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1700
1701         netif_stop_queue(dev);
1702
1703         /* shutdown adapter and release resources */
1704         shutdown(info);
1705
1706         hdlc_close(dev);
1707
1708         spin_lock_irqsave(&info->netlock, flags);
1709         info->netcount=0;
1710         spin_unlock_irqrestore(&info->netlock, flags);
1711
1712         return 0;
1713 }
1714
1715 /**
1716  * called by network layer to process IOCTL call to network device
1717  *
1718  * dev  pointer to network device structure
1719  * ifr  pointer to network interface request structure
1720  * cmd  IOCTL command code
1721  *
1722  * returns 0 if success, otherwise error code
1723  */
1724 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1725 {
1726         const size_t size = sizeof(sync_serial_settings);
1727         sync_serial_settings new_line;
1728         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1729         SLMP_INFO *info = dev_to_port(dev);
1730         unsigned int flags;
1731
1732         if (debug_level >= DEBUG_LEVEL_INFO)
1733                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1734
1735         /* return error if TTY interface open */
1736         if (info->port.count)
1737                 return -EBUSY;
1738
1739         if (cmd != SIOCWANDEV)
1740                 return hdlc_ioctl(dev, ifr, cmd);
1741
1742         switch(ifr->ifr_settings.type) {
1743         case IF_GET_IFACE: /* return current sync_serial_settings */
1744
1745                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1746                 if (ifr->ifr_settings.size < size) {
1747                         ifr->ifr_settings.size = size; /* data size wanted */
1748                         return -ENOBUFS;
1749                 }
1750
1751                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1752                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1753                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1754                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1755
1756                 memset(&new_line, 0, sizeof(new_line));
1757                 switch (flags){
1758                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1759                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1760                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1761                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1762                 default: new_line.clock_type = CLOCK_DEFAULT;
1763                 }
1764
1765                 new_line.clock_rate = info->params.clock_speed;
1766                 new_line.loopback   = info->params.loopback ? 1:0;
1767
1768                 if (copy_to_user(line, &new_line, size))
1769                         return -EFAULT;
1770                 return 0;
1771
1772         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1773
1774                 if(!capable(CAP_NET_ADMIN))
1775                         return -EPERM;
1776                 if (copy_from_user(&new_line, line, size))
1777                         return -EFAULT;
1778
1779                 switch (new_line.clock_type)
1780                 {
1781                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1782                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1783                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1784                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1785                 case CLOCK_DEFAULT:  flags = info->params.flags &
1786                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1787                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1788                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1789                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1790                 default: return -EINVAL;
1791                 }
1792
1793                 if (new_line.loopback != 0 && new_line.loopback != 1)
1794                         return -EINVAL;
1795
1796                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1797                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1798                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1799                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1800                 info->params.flags |= flags;
1801
1802                 info->params.loopback = new_line.loopback;
1803
1804                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1805                         info->params.clock_speed = new_line.clock_rate;
1806                 else
1807                         info->params.clock_speed = 0;
1808
1809                 /* if network interface up, reprogram hardware */
1810                 if (info->netcount)
1811                         program_hw(info);
1812                 return 0;
1813
1814         default:
1815                 return hdlc_ioctl(dev, ifr, cmd);
1816         }
1817 }
1818
1819 /**
1820  * called by network layer when transmit timeout is detected
1821  *
1822  * dev  pointer to network device structure
1823  */
1824 static void hdlcdev_tx_timeout(struct net_device *dev)
1825 {
1826         SLMP_INFO *info = dev_to_port(dev);
1827         unsigned long flags;
1828
1829         if (debug_level >= DEBUG_LEVEL_INFO)
1830                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1831
1832         dev->stats.tx_errors++;
1833         dev->stats.tx_aborted_errors++;
1834
1835         spin_lock_irqsave(&info->lock,flags);
1836         tx_stop(info);
1837         spin_unlock_irqrestore(&info->lock,flags);
1838
1839         netif_wake_queue(dev);
1840 }
1841
1842 /**
1843  * called by device driver when transmit completes
1844  * reenable network layer transmit if stopped
1845  *
1846  * info  pointer to device instance information
1847  */
1848 static void hdlcdev_tx_done(SLMP_INFO *info)
1849 {
1850         if (netif_queue_stopped(info->netdev))
1851                 netif_wake_queue(info->netdev);
1852 }
1853
1854 /**
1855  * called by device driver when frame received
1856  * pass frame to network layer
1857  *
1858  * info  pointer to device instance information
1859  * buf   pointer to buffer contianing frame data
1860  * size  count of data bytes in buf
1861  */
1862 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1863 {
1864         struct sk_buff *skb = dev_alloc_skb(size);
1865         struct net_device *dev = info->netdev;
1866
1867         if (debug_level >= DEBUG_LEVEL_INFO)
1868                 printk("hdlcdev_rx(%s)\n",dev->name);
1869
1870         if (skb == NULL) {
1871                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1872                        dev->name);
1873                 dev->stats.rx_dropped++;
1874                 return;
1875         }
1876
1877         memcpy(skb_put(skb, size), buf, size);
1878
1879         skb->protocol = hdlc_type_trans(skb, dev);
1880
1881         dev->stats.rx_packets++;
1882         dev->stats.rx_bytes += size;
1883
1884         netif_rx(skb);
1885 }
1886
1887 static const struct net_device_ops hdlcdev_ops = {
1888         .ndo_open       = hdlcdev_open,
1889         .ndo_stop       = hdlcdev_close,
1890         .ndo_start_xmit = hdlc_start_xmit,
1891         .ndo_do_ioctl   = hdlcdev_ioctl,
1892         .ndo_tx_timeout = hdlcdev_tx_timeout,
1893 };
1894
1895 /**
1896  * called by device driver when adding device instance
1897  * do generic HDLC initialization
1898  *
1899  * info  pointer to device instance information
1900  *
1901  * returns 0 if success, otherwise error code
1902  */
1903 static int hdlcdev_init(SLMP_INFO *info)
1904 {
1905         int rc;
1906         struct net_device *dev;
1907         hdlc_device *hdlc;
1908
1909         /* allocate and initialize network and HDLC layer objects */
1910
1911         dev = alloc_hdlcdev(info);
1912         if (!dev) {
1913                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1914                 return -ENOMEM;
1915         }
1916
1917         /* for network layer reporting purposes only */
1918         dev->mem_start = info->phys_sca_base;
1919         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1920         dev->irq       = info->irq_level;
1921
1922         /* network layer callbacks and settings */
1923         dev->netdev_ops     = &hdlcdev_ops;
1924         dev->watchdog_timeo = 10 * HZ;
1925         dev->tx_queue_len   = 50;
1926
1927         /* generic HDLC layer callbacks and settings */
1928         hdlc         = dev_to_hdlc(dev);
1929         hdlc->attach = hdlcdev_attach;
1930         hdlc->xmit   = hdlcdev_xmit;
1931
1932         /* register objects with HDLC layer */
1933         rc = register_hdlc_device(dev);
1934         if (rc) {
1935                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1936                 free_netdev(dev);
1937                 return rc;
1938         }
1939
1940         info->netdev = dev;
1941         return 0;
1942 }
1943
1944 /**
1945  * called by device driver when removing device instance
1946  * do generic HDLC cleanup
1947  *
1948  * info  pointer to device instance information
1949  */
1950 static void hdlcdev_exit(SLMP_INFO *info)
1951 {
1952         unregister_hdlc_device(info->netdev);
1953         free_netdev(info->netdev);
1954         info->netdev = NULL;
1955 }
1956
1957 #endif /* CONFIG_HDLC */
1958
1959
1960 /* Return next bottom half action to perform.
1961  * Return Value:        BH action code or 0 if nothing to do.
1962  */
1963 static int bh_action(SLMP_INFO *info)
1964 {
1965         unsigned long flags;
1966         int rc = 0;
1967
1968         spin_lock_irqsave(&info->lock,flags);
1969
1970         if (info->pending_bh & BH_RECEIVE) {
1971                 info->pending_bh &= ~BH_RECEIVE;
1972                 rc = BH_RECEIVE;
1973         } else if (info->pending_bh & BH_TRANSMIT) {
1974                 info->pending_bh &= ~BH_TRANSMIT;
1975                 rc = BH_TRANSMIT;
1976         } else if (info->pending_bh & BH_STATUS) {
1977                 info->pending_bh &= ~BH_STATUS;
1978                 rc = BH_STATUS;
1979         }
1980
1981         if (!rc) {
1982                 /* Mark BH routine as complete */
1983                 info->bh_running = false;
1984                 info->bh_requested = false;
1985         }
1986
1987         spin_unlock_irqrestore(&info->lock,flags);
1988
1989         return rc;
1990 }
1991
1992 /* Perform bottom half processing of work items queued by ISR.
1993  */
1994 static void bh_handler(struct work_struct *work)
1995 {
1996         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
1997         int action;
1998
1999         if ( debug_level >= DEBUG_LEVEL_BH )
2000                 printk( "%s(%d):%s bh_handler() entry\n",
2001                         __FILE__,__LINE__,info->device_name);
2002
2003         info->bh_running = true;
2004
2005         while((action = bh_action(info)) != 0) {
2006
2007                 /* Process work item */
2008                 if ( debug_level >= DEBUG_LEVEL_BH )
2009                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2010                                 __FILE__,__LINE__,info->device_name, action);
2011
2012                 switch (action) {
2013
2014                 case BH_RECEIVE:
2015                         bh_receive(info);
2016                         break;
2017                 case BH_TRANSMIT:
2018                         bh_transmit(info);
2019                         break;
2020                 case BH_STATUS:
2021                         bh_status(info);
2022                         break;
2023                 default:
2024                         /* unknown work item ID */
2025                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2026                                 __FILE__,__LINE__,info->device_name,action);
2027                         break;
2028                 }
2029         }
2030
2031         if ( debug_level >= DEBUG_LEVEL_BH )
2032                 printk( "%s(%d):%s bh_handler() exit\n",
2033                         __FILE__,__LINE__,info->device_name);
2034 }
2035
2036 static void bh_receive(SLMP_INFO *info)
2037 {
2038         if ( debug_level >= DEBUG_LEVEL_BH )
2039                 printk( "%s(%d):%s bh_receive()\n",
2040                         __FILE__,__LINE__,info->device_name);
2041
2042         while( rx_get_frame(info) );
2043 }
2044
2045 static void bh_transmit(SLMP_INFO *info)
2046 {
2047         struct tty_struct *tty = info->port.tty;
2048
2049         if ( debug_level >= DEBUG_LEVEL_BH )
2050                 printk( "%s(%d):%s bh_transmit() entry\n",
2051                         __FILE__,__LINE__,info->device_name);
2052
2053         if (tty)
2054                 tty_wakeup(tty);
2055 }
2056
2057 static void bh_status(SLMP_INFO *info)
2058 {
2059         if ( debug_level >= DEBUG_LEVEL_BH )
2060                 printk( "%s(%d):%s bh_status() entry\n",
2061                         __FILE__,__LINE__,info->device_name);
2062
2063         info->ri_chkcount = 0;
2064         info->dsr_chkcount = 0;
2065         info->dcd_chkcount = 0;
2066         info->cts_chkcount = 0;
2067 }
2068
2069 static void isr_timer(SLMP_INFO * info)
2070 {
2071         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2072
2073         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2074         write_reg(info, IER2, 0);
2075
2076         /* TMCS, Timer Control/Status Register
2077          *
2078          * 07      CMF, Compare match flag (read only) 1=match
2079          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2080          * 05      Reserved, must be 0
2081          * 04      TME, Timer Enable
2082          * 03..00  Reserved, must be 0
2083          *
2084          * 0000 0000
2085          */
2086         write_reg(info, (unsigned char)(timer + TMCS), 0);
2087
2088         info->irq_occurred = true;
2089
2090         if ( debug_level >= DEBUG_LEVEL_ISR )
2091                 printk("%s(%d):%s isr_timer()\n",
2092                         __FILE__,__LINE__,info->device_name);
2093 }
2094
2095 static void isr_rxint(SLMP_INFO * info)
2096 {
2097         struct tty_struct *tty = info->port.tty;
2098         struct  mgsl_icount *icount = &info->icount;
2099         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2100         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2101
2102         /* clear status bits */
2103         if (status)
2104                 write_reg(info, SR1, status);
2105
2106         if (status2)
2107                 write_reg(info, SR2, status2);
2108
2109         if ( debug_level >= DEBUG_LEVEL_ISR )
2110                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2111                         __FILE__,__LINE__,info->device_name,status,status2);
2112
2113         if (info->params.mode == MGSL_MODE_ASYNC) {
2114                 if (status & BRKD) {
2115                         icount->brk++;
2116
2117                         /* process break detection if tty control
2118                          * is not set to ignore it
2119                          */
2120                         if (!(status & info->ignore_status_mask1)) {
2121                                 if (info->read_status_mask1 & BRKD) {
2122                                         tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2123                                         if (tty && (info->port.flags & ASYNC_SAK))
2124                                                 do_SAK(tty);
2125                                 }
2126                         }
2127                 }
2128         }
2129         else {
2130                 if (status & (FLGD|IDLD)) {
2131                         if (status & FLGD)
2132                                 info->icount.exithunt++;
2133                         else if (status & IDLD)
2134                                 info->icount.rxidle++;
2135                         wake_up_interruptible(&info->event_wait_q);
2136                 }
2137         }
2138
2139         if (status & CDCD) {
2140                 /* simulate a common modem status change interrupt
2141                  * for our handler
2142                  */
2143                 get_signals( info );
2144                 isr_io_pin(info,
2145                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2146         }
2147 }
2148
2149 /*
2150  * handle async rx data interrupts
2151  */
2152 static void isr_rxrdy(SLMP_INFO * info)
2153 {
2154         u16 status;
2155         unsigned char DataByte;
2156         struct  mgsl_icount *icount = &info->icount;
2157
2158         if ( debug_level >= DEBUG_LEVEL_ISR )
2159                 printk("%s(%d):%s isr_rxrdy\n",
2160                         __FILE__,__LINE__,info->device_name);
2161
2162         while((status = read_reg(info,CST0)) & BIT0)
2163         {
2164                 int flag = 0;
2165                 bool over = false;
2166                 DataByte = read_reg(info,TRB);
2167
2168                 icount->rx++;
2169
2170                 if ( status & (PE + FRME + OVRN) ) {
2171                         printk("%s(%d):%s rxerr=%04X\n",
2172                                 __FILE__,__LINE__,info->device_name,status);
2173
2174                         /* update error statistics */
2175                         if (status & PE)
2176                                 icount->parity++;
2177                         else if (status & FRME)
2178                                 icount->frame++;
2179                         else if (status & OVRN)
2180                                 icount->overrun++;
2181
2182                         /* discard char if tty control flags say so */
2183                         if (status & info->ignore_status_mask2)
2184                                 continue;
2185
2186                         status &= info->read_status_mask2;
2187
2188                         if (status & PE)
2189                                 flag = TTY_PARITY;
2190                         else if (status & FRME)
2191                                 flag = TTY_FRAME;
2192                         if (status & OVRN) {
2193                                 /* Overrun is special, since it's
2194                                  * reported immediately, and doesn't
2195                                  * affect the current character
2196                                  */
2197                                 over = true;
2198                         }
2199                 }       /* end of if (error) */
2200
2201                 tty_insert_flip_char(&info->port, DataByte, flag);
2202                 if (over)
2203                         tty_insert_flip_char(&info->port, 0, TTY_OVERRUN);
2204         }
2205
2206         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2207                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2208                         __FILE__,__LINE__,info->device_name,
2209                         icount->rx,icount->brk,icount->parity,
2210                         icount->frame,icount->overrun);
2211         }
2212
2213         tty_flip_buffer_push(&info->port);
2214 }
2215
2216 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2217 {
2218         if ( debug_level >= DEBUG_LEVEL_ISR )
2219                 printk("%s(%d):%s isr_txeom status=%02x\n",
2220                         __FILE__,__LINE__,info->device_name,status);
2221
2222         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2223         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2224         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2225
2226         if (status & UDRN) {
2227                 write_reg(info, CMD, TXRESET);
2228                 write_reg(info, CMD, TXENABLE);
2229         } else
2230                 write_reg(info, CMD, TXBUFCLR);
2231
2232         /* disable and clear tx interrupts */
2233         info->ie0_value &= ~TXRDYE;
2234         info->ie1_value &= ~(IDLE + UDRN);
2235         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2236         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2237
2238         if ( info->tx_active ) {
2239                 if (info->params.mode != MGSL_MODE_ASYNC) {
2240                         if (status & UDRN)
2241                                 info->icount.txunder++;
2242                         else if (status & IDLE)
2243                                 info->icount.txok++;
2244                 }
2245
2246                 info->tx_active = false;
2247                 info->tx_count = info->tx_put = info->tx_get = 0;
2248
2249                 del_timer(&info->tx_timer);
2250
2251                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2252                         info->serial_signals &= ~SerialSignal_RTS;
2253                         info->drop_rts_on_tx_done = false;
2254                         set_signals(info);
2255                 }
2256
2257 #if SYNCLINK_GENERIC_HDLC
2258                 if (info->netcount)
2259                         hdlcdev_tx_done(info);
2260                 else
2261 #endif
2262                 {
2263                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2264                                 tx_stop(info);
2265                                 return;
2266                         }
2267                         info->pending_bh |= BH_TRANSMIT;
2268                 }
2269         }
2270 }
2271
2272
2273 /*
2274  * handle tx status interrupts
2275  */
2276 static void isr_txint(SLMP_INFO * info)
2277 {
2278         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2279
2280         /* clear status bits */
2281         write_reg(info, SR1, status);
2282
2283         if ( debug_level >= DEBUG_LEVEL_ISR )
2284                 printk("%s(%d):%s isr_txint status=%02x\n",
2285                         __FILE__,__LINE__,info->device_name,status);
2286
2287         if (status & (UDRN + IDLE))
2288                 isr_txeom(info, status);
2289
2290         if (status & CCTS) {
2291                 /* simulate a common modem status change interrupt
2292                  * for our handler
2293                  */
2294                 get_signals( info );
2295                 isr_io_pin(info,
2296                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2297
2298         }
2299 }
2300
2301 /*
2302  * handle async tx data interrupts
2303  */
2304 static void isr_txrdy(SLMP_INFO * info)
2305 {
2306         if ( debug_level >= DEBUG_LEVEL_ISR )
2307                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2308                         __FILE__,__LINE__,info->device_name,info->tx_count);
2309
2310         if (info->params.mode != MGSL_MODE_ASYNC) {
2311                 /* disable TXRDY IRQ, enable IDLE IRQ */
2312                 info->ie0_value &= ~TXRDYE;
2313                 info->ie1_value |= IDLE;
2314                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2315                 return;
2316         }
2317
2318         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2319                 tx_stop(info);
2320                 return;
2321         }
2322
2323         if ( info->tx_count )
2324                 tx_load_fifo( info );
2325         else {
2326                 info->tx_active = false;
2327                 info->ie0_value &= ~TXRDYE;
2328                 write_reg(info, IE0, info->ie0_value);
2329         }
2330
2331         if (info->tx_count < WAKEUP_CHARS)
2332                 info->pending_bh |= BH_TRANSMIT;
2333 }
2334
2335 static void isr_rxdmaok(SLMP_INFO * info)
2336 {
2337         /* BIT7 = EOT (end of transfer)
2338          * BIT6 = EOM (end of message/frame)
2339          */
2340         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2341
2342         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2343         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2344
2345         if ( debug_level >= DEBUG_LEVEL_ISR )
2346                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2347                         __FILE__,__LINE__,info->device_name,status);
2348
2349         info->pending_bh |= BH_RECEIVE;
2350 }
2351
2352 static void isr_rxdmaerror(SLMP_INFO * info)
2353 {
2354         /* BIT5 = BOF (buffer overflow)
2355          * BIT4 = COF (counter overflow)
2356          */
2357         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2358
2359         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2360         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2361
2362         if ( debug_level >= DEBUG_LEVEL_ISR )
2363                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2364                         __FILE__,__LINE__,info->device_name,status);
2365
2366         info->rx_overflow = true;
2367         info->pending_bh |= BH_RECEIVE;
2368 }
2369
2370 static void isr_txdmaok(SLMP_INFO * info)
2371 {
2372         unsigned char status_reg1 = read_reg(info, SR1);
2373
2374         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2375         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2376         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2377
2378         if ( debug_level >= DEBUG_LEVEL_ISR )
2379                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2380                         __FILE__,__LINE__,info->device_name,status_reg1);
2381
2382         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2383         write_reg16(info, TRC0, 0);
2384         info->ie0_value |= TXRDYE;
2385         write_reg(info, IE0, info->ie0_value);
2386 }
2387
2388 static void isr_txdmaerror(SLMP_INFO * info)
2389 {
2390         /* BIT5 = BOF (buffer overflow)
2391          * BIT4 = COF (counter overflow)
2392          */
2393         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2394
2395         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2396         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2397
2398         if ( debug_level >= DEBUG_LEVEL_ISR )
2399                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2400                         __FILE__,__LINE__,info->device_name,status);
2401 }
2402
2403 /* handle input serial signal changes
2404  */
2405 static void isr_io_pin( SLMP_INFO *info, u16 status )
2406 {
2407         struct  mgsl_icount *icount;
2408
2409         if ( debug_level >= DEBUG_LEVEL_ISR )
2410                 printk("%s(%d):isr_io_pin status=%04X\n",
2411                         __FILE__,__LINE__,status);
2412
2413         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2414                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2415                 icount = &info->icount;
2416                 /* update input line counters */
2417                 if (status & MISCSTATUS_RI_LATCHED) {
2418                         icount->rng++;
2419                         if ( status & SerialSignal_RI )
2420                                 info->input_signal_events.ri_up++;
2421                         else
2422                                 info->input_signal_events.ri_down++;
2423                 }
2424                 if (status & MISCSTATUS_DSR_LATCHED) {
2425                         icount->dsr++;
2426                         if ( status & SerialSignal_DSR )
2427                                 info->input_signal_events.dsr_up++;
2428                         else
2429                                 info->input_signal_events.dsr_down++;
2430                 }
2431                 if (status & MISCSTATUS_DCD_LATCHED) {
2432                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2433                                 info->ie1_value &= ~CDCD;
2434                                 write_reg(info, IE1, info->ie1_value);
2435                         }
2436                         icount->dcd++;
2437                         if (status & SerialSignal_DCD) {
2438                                 info->input_signal_events.dcd_up++;
2439                         } else
2440                                 info->input_signal_events.dcd_down++;
2441 #if SYNCLINK_GENERIC_HDLC
2442                         if (info->netcount) {
2443                                 if (status & SerialSignal_DCD)
2444                                         netif_carrier_on(info->netdev);
2445                                 else
2446                                         netif_carrier_off(info->netdev);
2447                         }
2448 #endif
2449                 }
2450                 if (status & MISCSTATUS_CTS_LATCHED)
2451                 {
2452                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2453                                 info->ie1_value &= ~CCTS;
2454                                 write_reg(info, IE1, info->ie1_value);
2455                         }
2456                         icount->cts++;
2457                         if ( status & SerialSignal_CTS )
2458                                 info->input_signal_events.cts_up++;
2459                         else
2460                                 info->input_signal_events.cts_down++;
2461                 }
2462                 wake_up_interruptible(&info->status_event_wait_q);
2463                 wake_up_interruptible(&info->event_wait_q);
2464
2465                 if (tty_port_check_carrier(&info->port) &&
2466                      (status & MISCSTATUS_DCD_LATCHED) ) {
2467                         if ( debug_level >= DEBUG_LEVEL_ISR )
2468                                 printk("%s CD now %s...", info->device_name,
2469                                        (status & SerialSignal_DCD) ? "on" : "off");
2470                         if (status & SerialSignal_DCD)
2471                                 wake_up_interruptible(&info->port.open_wait);
2472                         else {
2473                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2474                                         printk("doing serial hangup...");
2475                                 if (info->port.tty)
2476                                         tty_hangup(info->port.tty);
2477                         }
2478                 }
2479
2480                 if (tty_port_cts_enabled(&info->port) &&
2481                      (status & MISCSTATUS_CTS_LATCHED) ) {
2482                         if ( info->port.tty ) {
2483                                 if (info->port.tty->hw_stopped) {
2484                                         if (status & SerialSignal_CTS) {
2485                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2486                                                         printk("CTS tx start...");
2487                                                 info->port.tty->hw_stopped = 0;
2488                                                 tx_start(info);
2489                                                 info->pending_bh |= BH_TRANSMIT;
2490                                                 return;
2491                                         }
2492                                 } else {
2493                                         if (!(status & SerialSignal_CTS)) {
2494                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2495                                                         printk("CTS tx stop...");
2496                                                 info->port.tty->hw_stopped = 1;
2497                                                 tx_stop(info);
2498                                         }
2499                                 }
2500                         }
2501                 }
2502         }
2503
2504         info->pending_bh |= BH_STATUS;
2505 }
2506
2507 /* Interrupt service routine entry point.
2508  *
2509  * Arguments:
2510  *      irq             interrupt number that caused interrupt
2511  *      dev_id          device ID supplied during interrupt registration
2512  *      regs            interrupted processor context
2513  */
2514 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2515 {
2516         SLMP_INFO *info = dev_id;
2517         unsigned char status, status0, status1=0;
2518         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2519         unsigned char timerstatus0, timerstatus1=0;
2520         unsigned char shift;
2521         unsigned int i;
2522         unsigned short tmp;
2523
2524         if ( debug_level >= DEBUG_LEVEL_ISR )
2525                 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2526                         __FILE__, __LINE__, info->irq_level);
2527
2528         spin_lock(&info->lock);
2529
2530         for(;;) {
2531
2532                 /* get status for SCA0 (ports 0-1) */
2533                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2534                 status0 = (unsigned char)tmp;
2535                 dmastatus0 = (unsigned char)(tmp>>8);
2536                 timerstatus0 = read_reg(info, ISR2);
2537
2538                 if ( debug_level >= DEBUG_LEVEL_ISR )
2539                         printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2540                                 __FILE__, __LINE__, info->device_name,
2541                                 status0, dmastatus0, timerstatus0);
2542
2543                 if (info->port_count == 4) {
2544                         /* get status for SCA1 (ports 2-3) */
2545                         tmp = read_reg16(info->port_array[2], ISR0);
2546                         status1 = (unsigned char)tmp;
2547                         dmastatus1 = (unsigned char)(tmp>>8);
2548                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2549
2550                         if ( debug_level >= DEBUG_LEVEL_ISR )
2551                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2552                                         __FILE__,__LINE__,info->device_name,
2553                                         status1,dmastatus1,timerstatus1);
2554                 }
2555
2556                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2557                          !status1 && !dmastatus1 && !timerstatus1)
2558                         break;
2559
2560                 for(i=0; i < info->port_count ; i++) {
2561                         if (info->port_array[i] == NULL)
2562                                 continue;
2563                         if (i < 2) {
2564                                 status = status0;
2565                                 dmastatus = dmastatus0;
2566                         } else {
2567                                 status = status1;
2568                                 dmastatus = dmastatus1;
2569                         }
2570
2571                         shift = i & 1 ? 4 :0;
2572
2573                         if (status & BIT0 << shift)
2574                                 isr_rxrdy(info->port_array[i]);
2575                         if (status & BIT1 << shift)
2576                                 isr_txrdy(info->port_array[i]);
2577                         if (status & BIT2 << shift)
2578                                 isr_rxint(info->port_array[i]);
2579                         if (status & BIT3 << shift)
2580                                 isr_txint(info->port_array[i]);
2581
2582                         if (dmastatus & BIT0 << shift)
2583                                 isr_rxdmaerror(info->port_array[i]);
2584                         if (dmastatus & BIT1 << shift)
2585                                 isr_rxdmaok(info->port_array[i]);
2586                         if (dmastatus & BIT2 << shift)
2587                                 isr_txdmaerror(info->port_array[i]);
2588                         if (dmastatus & BIT3 << shift)
2589                                 isr_txdmaok(info->port_array[i]);
2590                 }
2591
2592                 if (timerstatus0 & (BIT5 | BIT4))
2593                         isr_timer(info->port_array[0]);
2594                 if (timerstatus0 & (BIT7 | BIT6))
2595                         isr_timer(info->port_array[1]);
2596                 if (timerstatus1 & (BIT5 | BIT4))
2597                         isr_timer(info->port_array[2]);
2598                 if (timerstatus1 & (BIT7 | BIT6))
2599                         isr_timer(info->port_array[3]);
2600         }
2601
2602         for(i=0; i < info->port_count ; i++) {
2603                 SLMP_INFO * port = info->port_array[i];
2604
2605                 /* Request bottom half processing if there's something
2606                  * for it to do and the bh is not already running.
2607                  *
2608                  * Note: startup adapter diags require interrupts.
2609                  * do not request bottom half processing if the
2610                  * device is not open in a normal mode.
2611                  */
2612                 if ( port && (port->port.count || port->netcount) &&
2613                      port->pending_bh && !port->bh_running &&
2614                      !port->bh_requested ) {
2615                         if ( debug_level >= DEBUG_LEVEL_ISR )
2616                                 printk("%s(%d):%s queueing bh task.\n",
2617                                         __FILE__,__LINE__,port->device_name);
2618                         schedule_work(&port->task);
2619                         port->bh_requested = true;
2620                 }
2621         }
2622
2623         spin_unlock(&info->lock);
2624
2625         if ( debug_level >= DEBUG_LEVEL_ISR )
2626                 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2627                         __FILE__, __LINE__, info->irq_level);
2628         return IRQ_HANDLED;
2629 }
2630
2631 /* Initialize and start device.
2632  */
2633 static int startup(SLMP_INFO * info)
2634 {
2635         if ( debug_level >= DEBUG_LEVEL_INFO )
2636                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2637
2638         if (tty_port_initialized(&info->port))
2639                 return 0;
2640
2641         if (!info->tx_buf) {
2642                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2643                 if (!info->tx_buf) {
2644                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2645                                 __FILE__,__LINE__,info->device_name);
2646                         return -ENOMEM;
2647                 }
2648         }
2649
2650         info->pending_bh = 0;
2651
2652         memset(&info->icount, 0, sizeof(info->icount));
2653
2654         /* program hardware for current parameters */
2655         reset_port(info);
2656
2657         change_params(info);
2658
2659         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2660
2661         if (info->port.tty)
2662                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2663
2664         tty_port_set_initialized(&info->port, 1);
2665
2666         return 0;
2667 }
2668
2669 /* Called by close() and hangup() to shutdown hardware
2670  */
2671 static void shutdown(SLMP_INFO * info)
2672 {
2673         unsigned long flags;
2674
2675         if (!tty_port_initialized(&info->port))
2676                 return;
2677
2678         if (debug_level >= DEBUG_LEVEL_INFO)
2679                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2680                          __FILE__,__LINE__, info->device_name );
2681
2682         /* clear status wait queue because status changes */
2683         /* can't happen after shutting down the hardware */
2684         wake_up_interruptible(&info->status_event_wait_q);
2685         wake_up_interruptible(&info->event_wait_q);
2686
2687         del_timer(&info->tx_timer);
2688         del_timer(&info->status_timer);
2689
2690         kfree(info->tx_buf);
2691         info->tx_buf = NULL;
2692
2693         spin_lock_irqsave(&info->lock,flags);
2694
2695         reset_port(info);
2696
2697         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2698                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2699                 set_signals(info);
2700         }
2701
2702         spin_unlock_irqrestore(&info->lock,flags);
2703
2704         if (info->port.tty)
2705                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2706
2707         tty_port_set_initialized(&info->port, 0);
2708 }
2709
2710 static void program_hw(SLMP_INFO *info)
2711 {
2712         unsigned long flags;
2713
2714         spin_lock_irqsave(&info->lock,flags);
2715
2716         rx_stop(info);
2717         tx_stop(info);
2718
2719         info->tx_count = info->tx_put = info->tx_get = 0;
2720
2721         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2722                 hdlc_mode(info);
2723         else
2724                 async_mode(info);
2725
2726         set_signals(info);
2727
2728         info->dcd_chkcount = 0;
2729         info->cts_chkcount = 0;
2730         info->ri_chkcount = 0;
2731         info->dsr_chkcount = 0;
2732
2733         info->ie1_value |= (CDCD|CCTS);
2734         write_reg(info, IE1, info->ie1_value);
2735
2736         get_signals(info);
2737
2738         if (info->netcount || (info->port.tty && info->port.tty->termios.c_cflag & CREAD) )
2739                 rx_start(info);
2740
2741         spin_unlock_irqrestore(&info->lock,flags);
2742 }
2743
2744 /* Reconfigure adapter based on new parameters
2745  */
2746 static void change_params(SLMP_INFO *info)
2747 {
2748         unsigned cflag;
2749         int bits_per_char;
2750
2751         if (!info->port.tty)
2752                 return;
2753
2754         if (debug_level >= DEBUG_LEVEL_INFO)
2755                 printk("%s(%d):%s change_params()\n",
2756                          __FILE__,__LINE__, info->device_name );
2757
2758         cflag = info->port.tty->termios.c_cflag;
2759
2760         /* if B0 rate (hangup) specified then negate RTS and DTR */
2761         /* otherwise assert RTS and DTR */
2762         if (cflag & CBAUD)
2763                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2764         else
2765                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2766
2767         /* byte size and parity */
2768
2769         switch (cflag & CSIZE) {
2770               case CS5: info->params.data_bits = 5; break;
2771               case CS6: info->params.data_bits = 6; break;
2772               case CS7: info->params.data_bits = 7; break;
2773               case CS8: info->params.data_bits = 8; break;
2774               /* Never happens, but GCC is too dumb to figure it out */
2775               default:  info->params.data_bits = 7; break;
2776               }
2777
2778         if (cflag & CSTOPB)
2779                 info->params.stop_bits = 2;
2780         else
2781                 info->params.stop_bits = 1;
2782
2783         info->params.parity = ASYNC_PARITY_NONE;
2784         if (cflag & PARENB) {
2785                 if (cflag & PARODD)
2786                         info->params.parity = ASYNC_PARITY_ODD;
2787                 else
2788                         info->params.parity = ASYNC_PARITY_EVEN;
2789 #ifdef CMSPAR
2790                 if (cflag & CMSPAR)
2791                         info->params.parity = ASYNC_PARITY_SPACE;
2792 #endif
2793         }
2794
2795         /* calculate number of jiffies to transmit a full
2796          * FIFO (32 bytes) at specified data rate
2797          */
2798         bits_per_char = info->params.data_bits +
2799                         info->params.stop_bits + 1;
2800
2801         /* if port data rate is set to 460800 or less then
2802          * allow tty settings to override, otherwise keep the
2803          * current data rate.
2804          */
2805         if (info->params.data_rate <= 460800) {
2806                 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2807         }
2808
2809         if ( info->params.data_rate ) {
2810                 info->timeout = (32*HZ*bits_per_char) /
2811                                 info->params.data_rate;
2812         }
2813         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2814
2815         tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
2816         tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
2817
2818         /* process tty input control flags */
2819
2820         info->read_status_mask2 = OVRN;
2821         if (I_INPCK(info->port.tty))
2822                 info->read_status_mask2 |= PE | FRME;
2823         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2824                 info->read_status_mask1 |= BRKD;
2825         if (I_IGNPAR(info->port.tty))
2826                 info->ignore_status_mask2 |= PE | FRME;
2827         if (I_IGNBRK(info->port.tty)) {
2828                 info->ignore_status_mask1 |= BRKD;
2829                 /* If ignoring parity and break indicators, ignore
2830                  * overruns too.  (For real raw support).
2831                  */
2832                 if (I_IGNPAR(info->port.tty))
2833                         info->ignore_status_mask2 |= OVRN;
2834         }
2835
2836         program_hw(info);
2837 }
2838
2839 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2840 {
2841         int err;
2842
2843         if (debug_level >= DEBUG_LEVEL_INFO)
2844                 printk("%s(%d):%s get_params()\n",
2845                          __FILE__,__LINE__, info->device_name);
2846
2847         if (!user_icount) {
2848                 memset(&info->icount, 0, sizeof(info->icount));
2849         } else {
2850                 mutex_lock(&info->port.mutex);
2851                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2852                 mutex_unlock(&info->port.mutex);
2853                 if (err)
2854                         return -EFAULT;
2855         }
2856
2857         return 0;
2858 }
2859
2860 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2861 {
2862         int err;
2863         if (debug_level >= DEBUG_LEVEL_INFO)
2864                 printk("%s(%d):%s get_params()\n",
2865                          __FILE__,__LINE__, info->device_name);
2866
2867         mutex_lock(&info->port.mutex);
2868         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2869         mutex_unlock(&info->port.mutex);
2870         if (err) {
2871                 if ( debug_level >= DEBUG_LEVEL_INFO )
2872                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2873                                 __FILE__,__LINE__,info->device_name);
2874                 return -EFAULT;
2875         }
2876
2877         return 0;
2878 }
2879
2880 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2881 {
2882         unsigned long flags;
2883         MGSL_PARAMS tmp_params;
2884         int err;
2885
2886         if (debug_level >= DEBUG_LEVEL_INFO)
2887                 printk("%s(%d):%s set_params\n",
2888                         __FILE__,__LINE__,info->device_name );
2889         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2890         if (err) {
2891                 if ( debug_level >= DEBUG_LEVEL_INFO )
2892                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2893                                 __FILE__,__LINE__,info->device_name);
2894                 return -EFAULT;
2895         }
2896
2897         mutex_lock(&info->port.mutex);
2898         spin_lock_irqsave(&info->lock,flags);
2899         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2900         spin_unlock_irqrestore(&info->lock,flags);
2901
2902         change_params(info);
2903         mutex_unlock(&info->port.mutex);
2904
2905         return 0;
2906 }
2907
2908 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2909 {
2910         int err;
2911
2912         if (debug_level >= DEBUG_LEVEL_INFO)
2913                 printk("%s(%d):%s get_txidle()=%d\n",
2914                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2915
2916         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2917         if (err) {
2918                 if ( debug_level >= DEBUG_LEVEL_INFO )
2919                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2920                                 __FILE__,__LINE__,info->device_name);
2921                 return -EFAULT;
2922         }
2923
2924         return 0;
2925 }
2926
2927 static int set_txidle(SLMP_INFO * info, int idle_mode)
2928 {
2929         unsigned long flags;
2930
2931         if (debug_level >= DEBUG_LEVEL_INFO)
2932                 printk("%s(%d):%s set_txidle(%d)\n",
2933                         __FILE__,__LINE__,info->device_name, idle_mode );
2934
2935         spin_lock_irqsave(&info->lock,flags);
2936         info->idle_mode = idle_mode;
2937         tx_set_idle( info );
2938         spin_unlock_irqrestore(&info->lock,flags);
2939         return 0;
2940 }
2941
2942 static int tx_enable(SLMP_INFO * info, int enable)
2943 {
2944         unsigned long flags;
2945
2946         if (debug_level >= DEBUG_LEVEL_INFO)
2947                 printk("%s(%d):%s tx_enable(%d)\n",
2948                         __FILE__,__LINE__,info->device_name, enable);
2949
2950         spin_lock_irqsave(&info->lock,flags);
2951         if ( enable ) {
2952                 if ( !info->tx_enabled ) {
2953                         tx_start(info);
2954                 }
2955         } else {
2956                 if ( info->tx_enabled )
2957                         tx_stop(info);
2958         }
2959         spin_unlock_irqrestore(&info->lock,flags);
2960         return 0;
2961 }
2962
2963 /* abort send HDLC frame
2964  */
2965 static int tx_abort(SLMP_INFO * info)
2966 {
2967         unsigned long flags;
2968
2969         if (debug_level >= DEBUG_LEVEL_INFO)
2970                 printk("%s(%d):%s tx_abort()\n",
2971                         __FILE__,__LINE__,info->device_name);
2972
2973         spin_lock_irqsave(&info->lock,flags);
2974         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
2975                 info->ie1_value &= ~UDRN;
2976                 info->ie1_value |= IDLE;
2977                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
2978                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
2979
2980                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
2981                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2982
2983                 write_reg(info, CMD, TXABORT);
2984         }
2985         spin_unlock_irqrestore(&info->lock,flags);
2986         return 0;
2987 }
2988
2989 static int rx_enable(SLMP_INFO * info, int enable)
2990 {
2991         unsigned long flags;
2992
2993         if (debug_level >= DEBUG_LEVEL_INFO)
2994                 printk("%s(%d):%s rx_enable(%d)\n",
2995                         __FILE__,__LINE__,info->device_name,enable);
2996
2997         spin_lock_irqsave(&info->lock,flags);
2998         if ( enable ) {
2999                 if ( !info->rx_enabled )
3000                         rx_start(info);
3001         } else {
3002                 if ( info->rx_enabled )
3003                         rx_stop(info);
3004         }
3005         spin_unlock_irqrestore(&info->lock,flags);
3006         return 0;
3007 }
3008
3009 /* wait for specified event to occur
3010  */
3011 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3012 {
3013         unsigned long flags;
3014         int s;
3015         int rc=0;
3016         struct mgsl_icount cprev, cnow;
3017         int events;
3018         int mask;
3019         struct  _input_signal_events oldsigs, newsigs;
3020         DECLARE_WAITQUEUE(wait, current);
3021
3022         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3023         if (rc) {
3024                 return  -EFAULT;
3025         }
3026
3027         if (debug_level >= DEBUG_LEVEL_INFO)
3028                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3029                         __FILE__,__LINE__,info->device_name,mask);
3030
3031         spin_lock_irqsave(&info->lock,flags);
3032
3033         /* return immediately if state matches requested events */
3034         get_signals(info);
3035         s = info->serial_signals;
3036
3037         events = mask &
3038                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3039                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3040                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3041                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3042         if (events) {
3043                 spin_unlock_irqrestore(&info->lock,flags);
3044                 goto exit;
3045         }
3046
3047         /* save current irq counts */
3048         cprev = info->icount;
3049         oldsigs = info->input_signal_events;
3050
3051         /* enable hunt and idle irqs if needed */
3052         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3053                 unsigned char oldval = info->ie1_value;
3054                 unsigned char newval = oldval +
3055                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3056                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3057                 if ( oldval != newval ) {
3058                         info->ie1_value = newval;
3059                         write_reg(info, IE1, info->ie1_value);
3060                 }
3061         }
3062
3063         set_current_state(TASK_INTERRUPTIBLE);
3064         add_wait_queue(&info->event_wait_q, &wait);
3065
3066         spin_unlock_irqrestore(&info->lock,flags);
3067
3068         for(;;) {
3069                 schedule();
3070                 if (signal_pending(current)) {
3071                         rc = -ERESTARTSYS;
3072                         break;
3073                 }
3074
3075                 /* get current irq counts */
3076                 spin_lock_irqsave(&info->lock,flags);
3077                 cnow = info->icount;
3078                 newsigs = info->input_signal_events;
3079                 set_current_state(TASK_INTERRUPTIBLE);
3080                 spin_unlock_irqrestore(&info->lock,flags);
3081
3082                 /* if no change, wait aborted for some reason */
3083                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3084                     newsigs.dsr_down == oldsigs.dsr_down &&
3085                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3086                     newsigs.dcd_down == oldsigs.dcd_down &&
3087                     newsigs.cts_up   == oldsigs.cts_up   &&
3088                     newsigs.cts_down == oldsigs.cts_down &&
3089                     newsigs.ri_up    == oldsigs.ri_up    &&
3090                     newsigs.ri_down  == oldsigs.ri_down  &&
3091                     cnow.exithunt    == cprev.exithunt   &&
3092                     cnow.rxidle      == cprev.rxidle) {
3093                         rc = -EIO;
3094                         break;
3095                 }
3096
3097                 events = mask &
3098                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3099                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3100                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3101                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3102                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3103                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3104                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3105                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3106                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3107                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3108                 if (events)
3109                         break;
3110
3111                 cprev = cnow;
3112                 oldsigs = newsigs;
3113         }
3114
3115         remove_wait_queue(&info->event_wait_q, &wait);
3116         set_current_state(TASK_RUNNING);
3117
3118
3119         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3120                 spin_lock_irqsave(&info->lock,flags);
3121                 if (!waitqueue_active(&info->event_wait_q)) {
3122                         /* disable enable exit hunt mode/idle rcvd IRQs */
3123                         info->ie1_value &= ~(FLGD|IDLD);
3124                         write_reg(info, IE1, info->ie1_value);
3125                 }
3126                 spin_unlock_irqrestore(&info->lock,flags);
3127         }
3128 exit:
3129         if ( rc == 0 )
3130                 PUT_USER(rc, events, mask_ptr);
3131
3132         return rc;
3133 }
3134
3135 static int modem_input_wait(SLMP_INFO *info,int arg)
3136 {
3137         unsigned long flags;
3138         int rc;
3139         struct mgsl_icount cprev, cnow;
3140         DECLARE_WAITQUEUE(wait, current);
3141
3142         /* save current irq counts */
3143         spin_lock_irqsave(&info->lock,flags);
3144         cprev = info->icount;
3145         add_wait_queue(&info->status_event_wait_q, &wait);
3146         set_current_state(TASK_INTERRUPTIBLE);
3147         spin_unlock_irqrestore(&info->lock,flags);
3148
3149         for(;;) {
3150                 schedule();
3151                 if (signal_pending(current)) {
3152                         rc = -ERESTARTSYS;
3153                         break;
3154                 }
3155
3156                 /* get new irq counts */
3157                 spin_lock_irqsave(&info->lock,flags);
3158                 cnow = info->icount;
3159                 set_current_state(TASK_INTERRUPTIBLE);
3160                 spin_unlock_irqrestore(&info->lock,flags);
3161
3162                 /* if no change, wait aborted for some reason */
3163                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3164                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3165                         rc = -EIO;
3166                         break;
3167                 }
3168
3169                 /* check for change in caller specified modem input */
3170                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3171                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3172                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3173                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3174                         rc = 0;
3175                         break;
3176                 }
3177
3178                 cprev = cnow;
3179         }
3180         remove_wait_queue(&info->status_event_wait_q, &wait);
3181         set_current_state(TASK_RUNNING);
3182         return rc;
3183 }
3184
3185 /* return the state of the serial control and status signals
3186  */
3187 static int tiocmget(struct tty_struct *tty)
3188 {
3189         SLMP_INFO *info = tty->driver_data;
3190         unsigned int result;
3191         unsigned long flags;
3192
3193         spin_lock_irqsave(&info->lock,flags);
3194         get_signals(info);
3195         spin_unlock_irqrestore(&info->lock,flags);
3196
3197         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS : 0) |
3198                  ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR : 0) |
3199                  ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR : 0) |
3200                  ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG : 0) |
3201                  ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR : 0) |
3202                  ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS : 0);
3203
3204         if (debug_level >= DEBUG_LEVEL_INFO)
3205                 printk("%s(%d):%s tiocmget() value=%08X\n",
3206                          __FILE__,__LINE__, info->device_name, result );
3207         return result;
3208 }
3209
3210 /* set modem control signals (DTR/RTS)
3211  */
3212 static int tiocmset(struct tty_struct *tty,
3213                                         unsigned int set, unsigned int clear)
3214 {
3215         SLMP_INFO *info = tty->driver_data;
3216         unsigned long flags;
3217
3218         if (debug_level >= DEBUG_LEVEL_INFO)
3219                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3220                         __FILE__,__LINE__,info->device_name, set, clear);
3221
3222         if (set & TIOCM_RTS)
3223                 info->serial_signals |= SerialSignal_RTS;
3224         if (set & TIOCM_DTR)
3225                 info->serial_signals |= SerialSignal_DTR;
3226         if (clear & TIOCM_RTS)
3227                 info->serial_signals &= ~SerialSignal_RTS;
3228         if (clear & TIOCM_DTR)
3229                 info->serial_signals &= ~SerialSignal_DTR;
3230
3231         spin_lock_irqsave(&info->lock,flags);
3232         set_signals(info);
3233         spin_unlock_irqrestore(&info->lock,flags);
3234
3235         return 0;
3236 }
3237
3238 static int carrier_raised(struct tty_port *port)
3239 {
3240         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3241         unsigned long flags;
3242
3243         spin_lock_irqsave(&info->lock,flags);
3244         get_signals(info);
3245         spin_unlock_irqrestore(&info->lock,flags);
3246
3247         return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3248 }
3249
3250 static void dtr_rts(struct tty_port *port, int on)
3251 {
3252         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3253         unsigned long flags;
3254
3255         spin_lock_irqsave(&info->lock,flags);
3256         if (on)
3257                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
3258         else
3259                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3260         set_signals(info);
3261         spin_unlock_irqrestore(&info->lock,flags);
3262 }
3263
3264 /* Block the current process until the specified port is ready to open.
3265  */
3266 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3267                            SLMP_INFO *info)
3268 {
3269         DECLARE_WAITQUEUE(wait, current);
3270         int             retval;
3271         bool            do_clocal = false;
3272         unsigned long   flags;
3273         int             cd;
3274         struct tty_port *port = &info->port;
3275
3276         if (debug_level >= DEBUG_LEVEL_INFO)
3277                 printk("%s(%d):%s block_til_ready()\n",
3278                          __FILE__,__LINE__, tty->driver->name );
3279
3280         if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
3281                 /* nonblock mode is set or port is not enabled */
3282                 /* just verify that callout device is not active */
3283                 tty_port_set_active(port, 1);
3284                 return 0;
3285         }
3286
3287         if (C_CLOCAL(tty))
3288                 do_clocal = true;
3289
3290         /* Wait for carrier detect and the line to become
3291          * free (i.e., not in use by the callout).  While we are in
3292          * this loop, port->count is dropped by one, so that
3293          * close() knows when to free things.  We restore it upon
3294          * exit, either normal or abnormal.
3295          */
3296
3297         retval = 0;
3298         add_wait_queue(&port->open_wait, &wait);
3299
3300         if (debug_level >= DEBUG_LEVEL_INFO)
3301                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3302                          __FILE__,__LINE__, tty->driver->name, port->count );
3303
3304         spin_lock_irqsave(&info->lock, flags);
3305         port->count--;
3306         spin_unlock_irqrestore(&info->lock, flags);
3307         port->blocked_open++;
3308
3309         while (1) {
3310                 if (C_BAUD(tty) && tty_port_initialized(port))
3311                         tty_port_raise_dtr_rts(port);
3312
3313                 set_current_state(TASK_INTERRUPTIBLE);
3314
3315                 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
3316                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3317                                         -EAGAIN : -ERESTARTSYS;
3318                         break;
3319                 }
3320
3321                 cd = tty_port_carrier_raised(port);
3322                 if (do_clocal || cd)
3323                         break;
3324
3325                 if (signal_pending(current)) {
3326                         retval = -ERESTARTSYS;
3327                         break;
3328                 }
3329
3330                 if (debug_level >= DEBUG_LEVEL_INFO)
3331                         printk("%s(%d):%s block_til_ready() count=%d\n",
3332                                  __FILE__,__LINE__, tty->driver->name, port->count );
3333
3334                 tty_unlock(tty);
3335                 schedule();
3336                 tty_lock(tty);
3337         }
3338
3339         set_current_state(TASK_RUNNING);
3340         remove_wait_queue(&port->open_wait, &wait);
3341         if (!tty_hung_up_p(filp))
3342                 port->count++;
3343         port->blocked_open--;
3344
3345         if (debug_level >= DEBUG_LEVEL_INFO)
3346                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3347                          __FILE__,__LINE__, tty->driver->name, port->count );
3348
3349         if (!retval)
3350                 tty_port_set_active(port, 1);
3351
3352         return retval;
3353 }
3354
3355 static int alloc_dma_bufs(SLMP_INFO *info)
3356 {
3357         unsigned short BuffersPerFrame;
3358         unsigned short BufferCount;
3359
3360         // Force allocation to start at 64K boundary for each port.
3361         // This is necessary because *all* buffer descriptors for a port
3362         // *must* be in the same 64K block. All descriptors on a port
3363         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3364         // into the CBP register.
3365         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3366
3367         /* Calculate the number of DMA buffers necessary to hold the */
3368         /* largest allowable frame size. Note: If the max frame size is */
3369         /* not an even multiple of the DMA buffer size then we need to */
3370         /* round the buffer count per frame up one. */
3371
3372         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3373         if ( info->max_frame_size % SCABUFSIZE )
3374                 BuffersPerFrame++;
3375
3376         /* calculate total number of data buffers (SCABUFSIZE) possible
3377          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3378          * for the descriptor list (BUFFERLISTSIZE).
3379          */
3380         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3381
3382         /* limit number of buffers to maximum amount of descriptors */
3383         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3384                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3385
3386         /* use enough buffers to transmit one max size frame */
3387         info->tx_buf_count = BuffersPerFrame + 1;
3388
3389         /* never use more than half the available buffers for transmit */
3390         if (info->tx_buf_count > (BufferCount/2))
3391                 info->tx_buf_count = BufferCount/2;
3392
3393         if (info->tx_buf_count > SCAMAXDESC)
3394                 info->tx_buf_count = SCAMAXDESC;
3395
3396         /* use remaining buffers for receive */
3397         info->rx_buf_count = BufferCount - info->tx_buf_count;
3398
3399         if (info->rx_buf_count > SCAMAXDESC)
3400                 info->rx_buf_count = SCAMAXDESC;
3401
3402         if ( debug_level >= DEBUG_LEVEL_INFO )
3403                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3404                         __FILE__,__LINE__, info->device_name,
3405                         info->tx_buf_count,info->rx_buf_count);
3406
3407         if ( alloc_buf_list( info ) < 0 ||
3408                 alloc_frame_bufs(info,
3409                                         info->rx_buf_list,
3410                                         info->rx_buf_list_ex,
3411                                         info->rx_buf_count) < 0 ||
3412                 alloc_frame_bufs(info,
3413                                         info->tx_buf_list,
3414                                         info->tx_buf_list_ex,
3415                                         info->tx_buf_count) < 0 ||
3416                 alloc_tmp_rx_buf(info) < 0 ) {
3417                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3418                         __FILE__,__LINE__, info->device_name);
3419                 return -ENOMEM;
3420         }
3421
3422         rx_reset_buffers( info );
3423
3424         return 0;
3425 }
3426
3427 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3428  */
3429 static int alloc_buf_list(SLMP_INFO *info)
3430 {
3431         unsigned int i;
3432
3433         /* build list in adapter shared memory */
3434         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3435         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3436         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3437
3438         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3439
3440         /* Save virtual address pointers to the receive and */
3441         /* transmit buffer lists. (Receive 1st). These pointers will */
3442         /* be used by the processor to access the lists. */
3443         info->rx_buf_list = (SCADESC *)info->buffer_list;
3444
3445         info->tx_buf_list = (SCADESC *)info->buffer_list;
3446         info->tx_buf_list += info->rx_buf_count;
3447
3448         /* Build links for circular buffer entry lists (tx and rx)
3449          *
3450          * Note: links are physical addresses read by the SCA device
3451          * to determine the next buffer entry to use.
3452          */
3453
3454         for ( i = 0; i < info->rx_buf_count; i++ ) {
3455                 /* calculate and store physical address of this buffer entry */
3456                 info->rx_buf_list_ex[i].phys_entry =
3457                         info->buffer_list_phys + (i * SCABUFSIZE);
3458
3459                 /* calculate and store physical address of */
3460                 /* next entry in cirular list of entries */
3461                 info->rx_buf_list[i].next = info->buffer_list_phys;
3462                 if ( i < info->rx_buf_count - 1 )
3463                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3464
3465                 info->rx_buf_list[i].length = SCABUFSIZE;
3466         }
3467
3468         for ( i = 0; i < info->tx_buf_count; i++ ) {
3469                 /* calculate and store physical address of this buffer entry */
3470                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3471                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3472
3473                 /* calculate and store physical address of */
3474                 /* next entry in cirular list of entries */
3475
3476                 info->tx_buf_list[i].next = info->buffer_list_phys +
3477                         info->rx_buf_count * sizeof(SCADESC);
3478
3479                 if ( i < info->tx_buf_count - 1 )
3480                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3481         }
3482
3483         return 0;
3484 }
3485
3486 /* Allocate the frame DMA buffers used by the specified buffer list.
3487  */
3488 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3489 {
3490         int i;
3491         unsigned long phys_addr;
3492
3493         for ( i = 0; i < count; i++ ) {
3494                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3495                 phys_addr = info->port_array[0]->last_mem_alloc;
3496                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3497
3498                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3499                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3500         }
3501
3502         return 0;
3503 }
3504
3505 static void free_dma_bufs(SLMP_INFO *info)
3506 {
3507         info->buffer_list = NULL;
3508         info->rx_buf_list = NULL;
3509         info->tx_buf_list = NULL;
3510 }
3511
3512 /* allocate buffer large enough to hold max_frame_size.
3513  * This buffer is used to pass an assembled frame to the line discipline.
3514  */
3515 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3516 {
3517         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3518         if (info->tmp_rx_buf == NULL)
3519                 return -ENOMEM;
3520         /* unused flag buffer to satisfy receive_buf calling interface */
3521         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
3522         if (!info->flag_buf) {
3523                 kfree(info->tmp_rx_buf);
3524                 info->tmp_rx_buf = NULL;
3525                 return -ENOMEM;
3526         }
3527         return 0;
3528 }
3529
3530 static void free_tmp_rx_buf(SLMP_INFO *info)
3531 {
3532         kfree(info->tmp_rx_buf);
3533         info->tmp_rx_buf = NULL;
3534         kfree(info->flag_buf);
3535         info->flag_buf = NULL;
3536 }
3537
3538 static int claim_resources(SLMP_INFO *info)
3539 {
3540         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3541                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3542                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3543                 info->init_error = DiagStatus_AddressConflict;
3544                 goto errout;
3545         }
3546         else
3547                 info->shared_mem_requested = true;
3548
3549         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3550                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3551                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3552                 info->init_error = DiagStatus_AddressConflict;
3553                 goto errout;
3554         }
3555         else
3556                 info->lcr_mem_requested = true;
3557
3558         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3559                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3560                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3561                 info->init_error = DiagStatus_AddressConflict;
3562                 goto errout;
3563         }
3564         else
3565                 info->sca_base_requested = true;
3566
3567         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3568                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3569                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3570                 info->init_error = DiagStatus_AddressConflict;
3571                 goto errout;
3572         }
3573         else
3574                 info->sca_statctrl_requested = true;
3575
3576         info->memory_base = ioremap_nocache(info->phys_memory_base,
3577                                                                 SCA_MEM_SIZE);
3578         if (!info->memory_base) {
3579                 printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
3580                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3581                 info->init_error = DiagStatus_CantAssignPciResources;
3582                 goto errout;
3583         }
3584
3585         info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3586         if (!info->lcr_base) {
3587                 printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
3588                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3589                 info->init_error = DiagStatus_CantAssignPciResources;
3590                 goto errout;
3591         }
3592         info->lcr_base += info->lcr_offset;
3593
3594         info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3595         if (!info->sca_base) {
3596                 printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
3597                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3598                 info->init_error = DiagStatus_CantAssignPciResources;
3599                 goto errout;
3600         }
3601         info->sca_base += info->sca_offset;
3602
3603         info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3604                                                                 PAGE_SIZE);
3605         if (!info->statctrl_base) {
3606                 printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
3607                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3608                 info->init_error = DiagStatus_CantAssignPciResources;
3609                 goto errout;
3610         }
3611         info->statctrl_base += info->statctrl_offset;
3612
3613         if ( !memory_test(info) ) {
3614                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3615                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3616                 info->init_error = DiagStatus_MemoryError;
3617                 goto errout;
3618         }
3619
3620         return 0;
3621
3622 errout:
3623         release_resources( info );
3624         return -ENODEV;
3625 }
3626
3627 static void release_resources(SLMP_INFO *info)
3628 {
3629         if ( debug_level >= DEBUG_LEVEL_INFO )
3630                 printk( "%s(%d):%s release_resources() entry\n",
3631                         __FILE__,__LINE__,info->device_name );
3632
3633         if ( info->irq_requested ) {
3634                 free_irq(info->irq_level, info);
3635                 info->irq_requested = false;
3636         }
3637
3638         if ( info->shared_mem_requested ) {
3639                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3640                 info->shared_mem_requested = false;
3641         }
3642         if ( info->lcr_mem_requested ) {
3643                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3644                 info->lcr_mem_requested = false;
3645         }
3646         if ( info->sca_base_requested ) {
3647                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3648                 info->sca_base_requested = false;
3649         }
3650         if ( info->sca_statctrl_requested ) {
3651                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3652                 info->sca_statctrl_requested = false;
3653         }
3654
3655         if (info->memory_base){
3656                 iounmap(info->memory_base);
3657                 info->memory_base = NULL;
3658         }
3659
3660         if (info->sca_base) {
3661                 iounmap(info->sca_base - info->sca_offset);
3662                 info->sca_base=NULL;
3663         }
3664
3665         if (info->statctrl_base) {
3666                 iounmap(info->statctrl_base - info->statctrl_offset);
3667                 info->statctrl_base=NULL;
3668         }
3669
3670         if (info->lcr_base){
3671                 iounmap(info->lcr_base - info->lcr_offset);
3672                 info->lcr_base = NULL;
3673         }
3674
3675         if ( debug_level >= DEBUG_LEVEL_INFO )
3676                 printk( "%s(%d):%s release_resources() exit\n",
3677                         __FILE__,__LINE__,info->device_name );
3678 }
3679
3680 /* Add the specified device instance data structure to the
3681  * global linked list of devices and increment the device count.
3682  */
3683 static int add_device(SLMP_INFO *info)
3684 {
3685         info->next_device = NULL;
3686         info->line = synclinkmp_device_count;
3687         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3688
3689         if (info->line < MAX_DEVICES) {
3690                 if (maxframe[info->line])
3691                         info->max_frame_size = maxframe[info->line];
3692         }
3693
3694         synclinkmp_device_count++;
3695
3696         if ( !synclinkmp_device_list )
3697                 synclinkmp_device_list = info;
3698         else {
3699                 SLMP_INFO *current_dev = synclinkmp_device_list;
3700                 while( current_dev->next_device )
3701                         current_dev = current_dev->next_device;
3702                 current_dev->next_device = info;
3703         }
3704
3705         if ( info->max_frame_size < 4096 )
3706                 info->max_frame_size = 4096;
3707         else if ( info->max_frame_size > 65535 )
3708                 info->max_frame_size = 65535;
3709
3710         printk( "SyncLink MultiPort %s: "
3711                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3712                 info->device_name,
3713                 info->phys_sca_base,
3714                 info->phys_memory_base,
3715                 info->phys_statctrl_base,
3716                 info->phys_lcr_base,
3717                 info->irq_level,
3718                 info->max_frame_size );
3719
3720 #if SYNCLINK_GENERIC_HDLC
3721         return hdlcdev_init(info);
3722 #else
3723         return 0;
3724 #endif
3725 }
3726
3727 static const struct tty_port_operations port_ops = {
3728         .carrier_raised = carrier_raised,
3729         .dtr_rts = dtr_rts,
3730 };
3731
3732 /* Allocate and initialize a device instance structure
3733  *
3734  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3735  */
3736 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3737 {
3738         SLMP_INFO *info;
3739
3740         info = kzalloc(sizeof(SLMP_INFO),
3741                  GFP_KERNEL);
3742
3743         if (!info) {
3744                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3745                         __FILE__,__LINE__, adapter_num, port_num);
3746         } else {
3747                 tty_port_init(&info->port);
3748                 info->port.ops = &port_ops;
3749                 info->magic = MGSL_MAGIC;
3750                 INIT_WORK(&info->task, bh_handler);
3751                 info->max_frame_size = 4096;
3752                 info->port.close_delay = 5*HZ/10;
3753                 info->port.closing_wait = 30*HZ;
3754                 init_waitqueue_head(&info->status_event_wait_q);
3755                 init_waitqueue_head(&info->event_wait_q);
3756                 spin_lock_init(&info->netlock);
3757                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3758                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3759                 info->adapter_num = adapter_num;
3760                 info->port_num = port_num;
3761
3762                 /* Copy configuration info to device instance data */
3763                 info->irq_level = pdev->irq;
3764                 info->phys_lcr_base = pci_resource_start(pdev,0);
3765                 info->phys_sca_base = pci_resource_start(pdev,2);
3766                 info->phys_memory_base = pci_resource_start(pdev,3);
3767                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3768
3769                 /* Because veremap only works on page boundaries we must map
3770                  * a larger area than is actually implemented for the LCR
3771                  * memory range. We map a full page starting at the page boundary.
3772                  */
3773                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3774                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3775
3776                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3777                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3778
3779                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3780                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3781
3782                 info->bus_type = MGSL_BUS_TYPE_PCI;
3783                 info->irq_flags = IRQF_SHARED;
3784
3785                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3786                 setup_timer(&info->status_timer, status_timeout,
3787                                 (unsigned long)info);
3788
3789                 /* Store the PCI9050 misc control register value because a flaw
3790                  * in the PCI9050 prevents LCR registers from being read if
3791                  * BIOS assigns an LCR base address with bit 7 set.
3792                  *
3793                  * Only the misc control register is accessed for which only
3794                  * write access is needed, so set an initial value and change
3795                  * bits to the device instance data as we write the value
3796                  * to the actual misc control register.
3797                  */
3798                 info->misc_ctrl_value = 0x087e4546;
3799
3800                 /* initial port state is unknown - if startup errors
3801                  * occur, init_error will be set to indicate the
3802                  * problem. Once the port is fully initialized,
3803                  * this value will be set to 0 to indicate the
3804                  * port is available.
3805                  */
3806                 info->init_error = -1;
3807         }
3808
3809         return info;
3810 }
3811
3812 static int device_init(int adapter_num, struct pci_dev *pdev)
3813 {
3814         SLMP_INFO *port_array[SCA_MAX_PORTS];
3815         int port, rc;
3816
3817         /* allocate device instances for up to SCA_MAX_PORTS devices */
3818         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3819                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3820                 if( port_array[port] == NULL ) {
3821                         for (--port; port >= 0; --port) {
3822                                 tty_port_destroy(&port_array[port]->port);
3823                                 kfree(port_array[port]);
3824                         }
3825                         return -ENOMEM;
3826                 }
3827         }
3828
3829         /* give copy of port_array to all ports and add to device list  */
3830         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3831                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3832                 rc = add_device( port_array[port] );
3833                 if (rc)
3834                         goto err_add;
3835                 spin_lock_init(&port_array[port]->lock);
3836         }
3837
3838         /* Allocate and claim adapter resources */
3839         if ( !claim_resources(port_array[0]) ) {
3840
3841                 alloc_dma_bufs(port_array[0]);
3842
3843                 /* copy resource information from first port to others */
3844                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3845                         port_array[port]->lock  = port_array[0]->lock;
3846                         port_array[port]->irq_level     = port_array[0]->irq_level;
3847                         port_array[port]->memory_base   = port_array[0]->memory_base;
3848                         port_array[port]->sca_base      = port_array[0]->sca_base;
3849                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3850                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3851                         alloc_dma_bufs(port_array[port]);
3852                 }
3853
3854                 rc = request_irq(port_array[0]->irq_level,
3855                                         synclinkmp_interrupt,
3856                                         port_array[0]->irq_flags,
3857                                         port_array[0]->device_name,
3858                                         port_array[0]);
3859                 if ( rc ) {
3860                         printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
3861                                 __FILE__,__LINE__,
3862                                 port_array[0]->device_name,
3863                                 port_array[0]->irq_level );
3864                         goto err_irq;
3865                 }
3866                 port_array[0]->irq_requested = true;
3867                 adapter_test(port_array[0]);
3868         }
3869         return 0;
3870 err_irq:
3871         release_resources( port_array[0] );
3872 err_add:
3873         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3874                 tty_port_destroy(&port_array[port]->port);
3875                 kfree(port_array[port]);
3876         }
3877         return rc;
3878 }
3879
3880 static const struct tty_operations ops = {
3881         .install = install,
3882         .open = open,
3883         .close = close,
3884         .write = write,
3885         .put_char = put_char,
3886         .flush_chars = flush_chars,
3887         .write_room = write_room,
3888         .chars_in_buffer = chars_in_buffer,
3889         .flush_buffer = flush_buffer,
3890         .ioctl = ioctl,
3891         .throttle = throttle,
3892         .unthrottle = unthrottle,
3893         .send_xchar = send_xchar,
3894         .break_ctl = set_break,
3895         .wait_until_sent = wait_until_sent,
3896         .set_termios = set_termios,
3897         .stop = tx_hold,
3898         .start = tx_release,
3899         .hangup = hangup,
3900         .tiocmget = tiocmget,
3901         .tiocmset = tiocmset,
3902         .get_icount = get_icount,
3903         .proc_fops = &synclinkmp_proc_fops,
3904 };
3905
3906
3907 static void synclinkmp_cleanup(void)
3908 {
3909         int rc;
3910         SLMP_INFO *info;
3911         SLMP_INFO *tmp;
3912
3913         printk("Unloading %s %s\n", driver_name, driver_version);
3914
3915         if (serial_driver) {
3916                 rc = tty_unregister_driver(serial_driver);
3917                 if (rc)
3918                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3919                                __FILE__,__LINE__,rc);
3920                 put_tty_driver(serial_driver);
3921         }
3922
3923         /* reset devices */
3924         info = synclinkmp_device_list;
3925         while(info) {
3926                 reset_port(info);
3927                 info = info->next_device;
3928         }
3929
3930         /* release devices */
3931         info = synclinkmp_device_list;
3932         while(info) {
3933 #if SYNCLINK_GENERIC_HDLC
3934                 hdlcdev_exit(info);
3935 #endif
3936                 free_dma_bufs(info);
3937                 free_tmp_rx_buf(info);
3938                 if ( info->port_num == 0 ) {
3939                         if (info->sca_base)
3940                                 write_reg(info, LPR, 1); /* set low power mode */
3941                         release_resources(info);
3942                 }
3943                 tmp = info;
3944                 info = info->next_device;
3945                 tty_port_destroy(&tmp->port);
3946                 kfree(tmp);
3947         }
3948
3949         pci_unregister_driver(&synclinkmp_pci_driver);
3950 }
3951
3952 /* Driver initialization entry point.
3953  */
3954
3955 static int __init synclinkmp_init(void)
3956 {
3957         int rc;
3958
3959         if (break_on_load) {
3960                 synclinkmp_get_text_ptr();
3961                 BREAKPOINT();
3962         }
3963
3964         printk("%s %s\n", driver_name, driver_version);
3965
3966         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3967                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3968                 return rc;
3969         }
3970
3971         serial_driver = alloc_tty_driver(128);
3972         if (!serial_driver) {
3973                 rc = -ENOMEM;
3974                 goto error;
3975         }
3976
3977         /* Initialize the tty_driver structure */
3978
3979         serial_driver->driver_name = "synclinkmp";
3980         serial_driver->name = "ttySLM";
3981         serial_driver->major = ttymajor;
3982         serial_driver->minor_start = 64;
3983         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3984         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3985         serial_driver->init_termios = tty_std_termios;
3986         serial_driver->init_termios.c_cflag =
3987                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3988         serial_driver->init_termios.c_ispeed = 9600;
3989         serial_driver->init_termios.c_ospeed = 9600;
3990         serial_driver->flags = TTY_DRIVER_REAL_RAW;
3991         tty_set_operations(serial_driver, &ops);
3992         if ((rc = tty_register_driver(serial_driver)) < 0) {
3993                 printk("%s(%d):Couldn't register serial driver\n",
3994                         __FILE__,__LINE__);
3995                 put_tty_driver(serial_driver);
3996                 serial_driver = NULL;
3997                 goto error;
3998         }
3999
4000         printk("%s %s, tty major#%d\n",
4001                 driver_name, driver_version,
4002                 serial_driver->major);
4003
4004         return 0;
4005
4006 error:
4007         synclinkmp_cleanup();
4008         return rc;
4009 }
4010
4011 static void __exit synclinkmp_exit(void)
4012 {
4013         synclinkmp_cleanup();
4014 }
4015
4016 module_init(synclinkmp_init);
4017 module_exit(synclinkmp_exit);
4018
4019 /* Set the port for internal loopback mode.
4020  * The TxCLK and RxCLK signals are generated from the BRG and
4021  * the TxD is looped back to the RxD internally.
4022  */
4023 static void enable_loopback(SLMP_INFO *info, int enable)
4024 {
4025         if (enable) {
4026                 /* MD2 (Mode Register 2)
4027                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4028                  */
4029                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4030
4031                 /* degate external TxC clock source */
4032                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4033                 write_control_reg(info);
4034
4035                 /* RXS/TXS (Rx/Tx clock source)
4036                  * 07      Reserved, must be 0
4037                  * 06..04  Clock Source, 100=BRG
4038                  * 03..00  Clock Divisor, 0000=1
4039                  */
4040                 write_reg(info, RXS, 0x40);
4041                 write_reg(info, TXS, 0x40);
4042
4043         } else {
4044                 /* MD2 (Mode Register 2)
4045                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4046                  */
4047                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4048
4049                 /* RXS/TXS (Rx/Tx clock source)
4050                  * 07      Reserved, must be 0
4051                  * 06..04  Clock Source, 000=RxC/TxC Pin
4052                  * 03..00  Clock Divisor, 0000=1
4053                  */
4054                 write_reg(info, RXS, 0x00);
4055                 write_reg(info, TXS, 0x00);
4056         }
4057
4058         /* set LinkSpeed if available, otherwise default to 2Mbps */
4059         if (info->params.clock_speed)
4060                 set_rate(info, info->params.clock_speed);
4061         else
4062                 set_rate(info, 3686400);
4063 }
4064
4065 /* Set the baud rate register to the desired speed
4066  *
4067  *      data_rate       data rate of clock in bits per second
4068  *                      A data rate of 0 disables the AUX clock.
4069  */
4070 static void set_rate( SLMP_INFO *info, u32 data_rate )
4071 {
4072         u32 TMCValue;
4073         unsigned char BRValue;
4074         u32 Divisor=0;
4075
4076         /* fBRG = fCLK/(TMC * 2^BR)
4077          */
4078         if (data_rate != 0) {
4079                 Divisor = 14745600/data_rate;
4080                 if (!Divisor)
4081                         Divisor = 1;
4082
4083                 TMCValue = Divisor;
4084
4085                 BRValue = 0;
4086                 if (TMCValue != 1 && TMCValue != 2) {
4087                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4088                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4089                          * 50/50 duty cycle.
4090                          */
4091                         BRValue = 1;
4092                         TMCValue >>= 1;
4093                 }
4094
4095                 /* while TMCValue is too big for TMC register, divide
4096                  * by 2 and increment BR exponent.
4097                  */
4098                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4099                         TMCValue >>= 1;
4100
4101                 write_reg(info, TXS,
4102                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4103                 write_reg(info, RXS,
4104                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4105                 write_reg(info, TMC, (unsigned char)TMCValue);
4106         }
4107         else {
4108                 write_reg(info, TXS,0);
4109                 write_reg(info, RXS,0);
4110                 write_reg(info, TMC, 0);
4111         }
4112 }
4113
4114 /* Disable receiver
4115  */
4116 static void rx_stop(SLMP_INFO *info)
4117 {
4118         if (debug_level >= DEBUG_LEVEL_ISR)
4119                 printk("%s(%d):%s rx_stop()\n",
4120                          __FILE__,__LINE__, info->device_name );
4121
4122         write_reg(info, CMD, RXRESET);
4123
4124         info->ie0_value &= ~RXRDYE;
4125         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4126
4127         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4128         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4129         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4130
4131         info->rx_enabled = false;
4132         info->rx_overflow = false;
4133 }
4134
4135 /* enable the receiver
4136  */
4137 static void rx_start(SLMP_INFO *info)
4138 {
4139         int i;
4140
4141         if (debug_level >= DEBUG_LEVEL_ISR)
4142                 printk("%s(%d):%s rx_start()\n",
4143                          __FILE__,__LINE__, info->device_name );
4144
4145         write_reg(info, CMD, RXRESET);
4146
4147         if ( info->params.mode == MGSL_MODE_HDLC ) {
4148                 /* HDLC, disabe IRQ on rxdata */
4149                 info->ie0_value &= ~RXRDYE;
4150                 write_reg(info, IE0, info->ie0_value);
4151
4152                 /* Reset all Rx DMA buffers and program rx dma */
4153                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4154                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4155
4156                 for (i = 0; i < info->rx_buf_count; i++) {
4157                         info->rx_buf_list[i].status = 0xff;
4158
4159                         // throttle to 4 shared memory writes at a time to prevent
4160                         // hogging local bus (keep latency time for DMA requests low).
4161                         if (!(i % 4))
4162                                 read_status_reg(info);
4163                 }
4164                 info->current_rx_buf = 0;
4165
4166                 /* set current/1st descriptor address */
4167                 write_reg16(info, RXDMA + CDA,
4168                         info->rx_buf_list_ex[0].phys_entry);
4169
4170                 /* set new last rx descriptor address */
4171                 write_reg16(info, RXDMA + EDA,
4172                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4173
4174                 /* set buffer length (shared by all rx dma data buffers) */
4175                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4176
4177                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4178                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4179         } else {
4180                 /* async, enable IRQ on rxdata */
4181                 info->ie0_value |= RXRDYE;
4182                 write_reg(info, IE0, info->ie0_value);
4183         }
4184
4185         write_reg(info, CMD, RXENABLE);
4186
4187         info->rx_overflow = false;
4188         info->rx_enabled = true;
4189 }
4190
4191 /* Enable the transmitter and send a transmit frame if
4192  * one is loaded in the DMA buffers.
4193  */
4194 static void tx_start(SLMP_INFO *info)
4195 {
4196         if (debug_level >= DEBUG_LEVEL_ISR)
4197                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4198                          __FILE__,__LINE__, info->device_name,info->tx_count );
4199
4200         if (!info->tx_enabled ) {
4201                 write_reg(info, CMD, TXRESET);
4202                 write_reg(info, CMD, TXENABLE);
4203                 info->tx_enabled = true;
4204         }
4205
4206         if ( info->tx_count ) {
4207
4208                 /* If auto RTS enabled and RTS is inactive, then assert */
4209                 /* RTS and set a flag indicating that the driver should */
4210                 /* negate RTS when the transmission completes. */
4211
4212                 info->drop_rts_on_tx_done = false;
4213
4214                 if (info->params.mode != MGSL_MODE_ASYNC) {
4215
4216                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4217                                 get_signals( info );
4218                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4219                                         info->serial_signals |= SerialSignal_RTS;
4220                                         set_signals( info );
4221                                         info->drop_rts_on_tx_done = true;
4222                                 }
4223                         }
4224
4225                         write_reg16(info, TRC0,
4226                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4227
4228                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4229                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4230
4231                         /* set TX CDA (current descriptor address) */
4232                         write_reg16(info, TXDMA + CDA,
4233                                 info->tx_buf_list_ex[0].phys_entry);
4234
4235                         /* set TX EDA (last descriptor address) */
4236                         write_reg16(info, TXDMA + EDA,
4237                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4238
4239                         /* enable underrun IRQ */
4240                         info->ie1_value &= ~IDLE;
4241                         info->ie1_value |= UDRN;
4242                         write_reg(info, IE1, info->ie1_value);
4243                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4244
4245                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4246                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4247
4248                         mod_timer(&info->tx_timer, jiffies +
4249                                         msecs_to_jiffies(5000));
4250                 }
4251                 else {
4252                         tx_load_fifo(info);
4253                         /* async, enable IRQ on txdata */
4254                         info->ie0_value |= TXRDYE;
4255                         write_reg(info, IE0, info->ie0_value);
4256                 }
4257
4258                 info->tx_active = true;
4259         }
4260 }
4261
4262 /* stop the transmitter and DMA
4263  */
4264 static void tx_stop( SLMP_INFO *info )
4265 {
4266         if (debug_level >= DEBUG_LEVEL_ISR)
4267                 printk("%s(%d):%s tx_stop()\n",
4268                          __FILE__,__LINE__, info->device_name );
4269
4270         del_timer(&info->tx_timer);
4271
4272         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4273         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4274
4275         write_reg(info, CMD, TXRESET);
4276
4277         info->ie1_value &= ~(UDRN + IDLE);
4278         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4279         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4280
4281         info->ie0_value &= ~TXRDYE;
4282         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4283
4284         info->tx_enabled = false;
4285         info->tx_active = false;
4286 }
4287
4288 /* Fill the transmit FIFO until the FIFO is full or
4289  * there is no more data to load.
4290  */
4291 static void tx_load_fifo(SLMP_INFO *info)
4292 {
4293         u8 TwoBytes[2];
4294
4295         /* do nothing is now tx data available and no XON/XOFF pending */
4296
4297         if ( !info->tx_count && !info->x_char )
4298                 return;
4299
4300         /* load the Transmit FIFO until FIFOs full or all data sent */
4301
4302         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4303
4304                 /* there is more space in the transmit FIFO and */
4305                 /* there is more data in transmit buffer */
4306
4307                 if ( (info->tx_count > 1) && !info->x_char ) {
4308                         /* write 16-bits */
4309                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4310                         if (info->tx_get >= info->max_frame_size)
4311                                 info->tx_get -= info->max_frame_size;
4312                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4313                         if (info->tx_get >= info->max_frame_size)
4314                                 info->tx_get -= info->max_frame_size;
4315
4316                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4317
4318                         info->tx_count -= 2;
4319                         info->icount.tx += 2;
4320                 } else {
4321                         /* only 1 byte left to transmit or 1 FIFO slot left */
4322
4323                         if (info->x_char) {
4324                                 /* transmit pending high priority char */
4325                                 write_reg(info, TRB, info->x_char);
4326                                 info->x_char = 0;
4327                         } else {
4328                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4329                                 if (info->tx_get >= info->max_frame_size)
4330                                         info->tx_get -= info->max_frame_size;
4331                                 info->tx_count--;
4332                         }
4333                         info->icount.tx++;
4334                 }
4335         }
4336 }
4337
4338 /* Reset a port to a known state
4339  */
4340 static void reset_port(SLMP_INFO *info)
4341 {
4342         if (info->sca_base) {
4343
4344                 tx_stop(info);
4345                 rx_stop(info);
4346
4347                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4348                 set_signals(info);
4349
4350                 /* disable all port interrupts */
4351                 info->ie0_value = 0;
4352                 info->ie1_value = 0;
4353                 info->ie2_value = 0;
4354                 write_reg(info, IE0, info->ie0_value);
4355                 write_reg(info, IE1, info->ie1_value);
4356                 write_reg(info, IE2, info->ie2_value);
4357
4358                 write_reg(info, CMD, CHRESET);
4359         }
4360 }
4361
4362 /* Reset all the ports to a known state.
4363  */
4364 static void reset_adapter(SLMP_INFO *info)
4365 {
4366         int i;
4367
4368         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4369                 if (info->port_array[i])
4370                         reset_port(info->port_array[i]);
4371         }
4372 }
4373
4374 /* Program port for asynchronous communications.
4375  */
4376 static void async_mode(SLMP_INFO *info)
4377 {
4378
4379         unsigned char RegValue;
4380
4381         tx_stop(info);
4382         rx_stop(info);
4383
4384         /* MD0, Mode Register 0
4385          *
4386          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4387          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4388          * 03      Reserved, must be 0
4389          * 02      CRCCC, CRC Calculation, 0=disabled
4390          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4391          *
4392          * 0000 0000
4393          */
4394         RegValue = 0x00;
4395         if (info->params.stop_bits != 1)
4396                 RegValue |= BIT1;
4397         write_reg(info, MD0, RegValue);
4398
4399         /* MD1, Mode Register 1
4400          *
4401          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4402          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4403          * 03..02  RXCHR<1..0>, rx char size
4404          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4405          *
4406          * 0100 0000
4407          */
4408         RegValue = 0x40;
4409         switch (info->params.data_bits) {
4410         case 7: RegValue |= BIT4 + BIT2; break;
4411         case 6: RegValue |= BIT5 + BIT3; break;
4412         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4413         }
4414         if (info->params.parity != ASYNC_PARITY_NONE) {
4415                 RegValue |= BIT1;
4416                 if (info->params.parity == ASYNC_PARITY_ODD)
4417                         RegValue |= BIT0;
4418         }
4419         write_reg(info, MD1, RegValue);
4420
4421         /* MD2, Mode Register 2
4422          *
4423          * 07..02  Reserved, must be 0
4424          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4425          *
4426          * 0000 0000
4427          */
4428         RegValue = 0x00;
4429         if (info->params.loopback)
4430                 RegValue |= (BIT1 + BIT0);
4431         write_reg(info, MD2, RegValue);
4432
4433         /* RXS, Receive clock source
4434          *
4435          * 07      Reserved, must be 0
4436          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4437          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4438          */
4439         RegValue=BIT6;
4440         write_reg(info, RXS, RegValue);
4441
4442         /* TXS, Transmit clock source
4443          *
4444          * 07      Reserved, must be 0
4445          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4446          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4447          */
4448         RegValue=BIT6;
4449         write_reg(info, TXS, RegValue);
4450
4451         /* Control Register
4452          *
4453          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4454          */
4455         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4456         write_control_reg(info);
4457
4458         tx_set_idle(info);
4459
4460         /* RRC Receive Ready Control 0
4461          *
4462          * 07..05  Reserved, must be 0
4463          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4464          */
4465         write_reg(info, RRC, 0x00);
4466
4467         /* TRC0 Transmit Ready Control 0
4468          *
4469          * 07..05  Reserved, must be 0
4470          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4471          */
4472         write_reg(info, TRC0, 0x10);
4473
4474         /* TRC1 Transmit Ready Control 1
4475          *
4476          * 07..05  Reserved, must be 0
4477          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4478          */
4479         write_reg(info, TRC1, 0x1e);
4480
4481         /* CTL, MSCI control register
4482          *
4483          * 07..06  Reserved, set to 0
4484          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4485          * 04      IDLC, idle control, 0=mark 1=idle register
4486          * 03      BRK, break, 0=off 1 =on (async)
4487          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4488          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4489          * 00      RTS, RTS output control, 0=active 1=inactive
4490          *
4491          * 0001 0001
4492          */
4493         RegValue = 0x10;
4494         if (!(info->serial_signals & SerialSignal_RTS))
4495                 RegValue |= 0x01;
4496         write_reg(info, CTL, RegValue);
4497
4498         /* enable status interrupts */
4499         info->ie0_value |= TXINTE + RXINTE;
4500         write_reg(info, IE0, info->ie0_value);
4501
4502         /* enable break detect interrupt */
4503         info->ie1_value = BRKD;
4504         write_reg(info, IE1, info->ie1_value);
4505
4506         /* enable rx overrun interrupt */
4507         info->ie2_value = OVRN;
4508         write_reg(info, IE2, info->ie2_value);
4509
4510         set_rate( info, info->params.data_rate * 16 );
4511 }
4512
4513 /* Program the SCA for HDLC communications.
4514  */
4515 static void hdlc_mode(SLMP_INFO *info)
4516 {
4517         unsigned char RegValue;
4518         u32 DpllDivisor;
4519
4520         // Can't use DPLL because SCA outputs recovered clock on RxC when
4521         // DPLL mode selected. This causes output contention with RxC receiver.
4522         // Use of DPLL would require external hardware to disable RxC receiver
4523         // when DPLL mode selected.
4524         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4525
4526         /* disable DMA interrupts */
4527         write_reg(info, TXDMA + DIR, 0);
4528         write_reg(info, RXDMA + DIR, 0);
4529
4530         /* MD0, Mode Register 0
4531          *
4532          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4533          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4534          * 03      Reserved, must be 0
4535          * 02      CRCCC, CRC Calculation, 1=enabled
4536          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4537          * 00      CRC0, CRC initial value, 1 = all 1s
4538          *
4539          * 1000 0001
4540          */
4541         RegValue = 0x81;
4542         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4543                 RegValue |= BIT4;
4544         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4545                 RegValue |= BIT4;
4546         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4547                 RegValue |= BIT2 + BIT1;
4548         write_reg(info, MD0, RegValue);
4549
4550         /* MD1, Mode Register 1
4551          *
4552          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4553          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4554          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4555          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4556          *
4557          * 0000 0000
4558          */
4559         RegValue = 0x00;
4560         write_reg(info, MD1, RegValue);
4561
4562         /* MD2, Mode Register 2
4563          *
4564          * 07      NRZFM, 0=NRZ, 1=FM
4565          * 06..05  CODE<1..0> Encoding, 00=NRZ
4566          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4567          * 02      Reserved, must be 0
4568          * 01..00  CNCT<1..0> Channel connection, 0=normal
4569          *
4570          * 0000 0000
4571          */
4572         RegValue = 0x00;
4573         switch(info->params.encoding) {
4574         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4575         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4576         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4577         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4578 #if 0
4579         case HDLC_ENCODING_NRZB:                                        /* not supported */
4580         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4581         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4582 #endif
4583         }
4584         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4585                 DpllDivisor = 16;
4586                 RegValue |= BIT3;
4587         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4588                 DpllDivisor = 8;
4589         } else {
4590                 DpllDivisor = 32;
4591                 RegValue |= BIT4;
4592         }
4593         write_reg(info, MD2, RegValue);
4594
4595
4596         /* RXS, Receive clock source
4597          *
4598          * 07      Reserved, must be 0
4599          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4600          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4601          */
4602         RegValue=0;
4603         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4604                 RegValue |= BIT6;
4605         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4606                 RegValue |= BIT6 + BIT5;
4607         write_reg(info, RXS, RegValue);
4608
4609         /* TXS, Transmit clock source
4610          *
4611          * 07      Reserved, must be 0
4612          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4613          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4614          */
4615         RegValue=0;
4616         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4617                 RegValue |= BIT6;
4618         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4619                 RegValue |= BIT6 + BIT5;
4620         write_reg(info, TXS, RegValue);
4621
4622         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4623                 set_rate(info, info->params.clock_speed * DpllDivisor);
4624         else
4625                 set_rate(info, info->params.clock_speed);
4626
4627         /* GPDATA (General Purpose I/O Data Register)
4628          *
4629          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4630          */
4631         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4632                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4633         else
4634                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4635         write_control_reg(info);
4636
4637         /* RRC Receive Ready Control 0
4638          *
4639          * 07..05  Reserved, must be 0
4640          * 04..00  RRC<4..0> Rx FIFO trigger active
4641          */
4642         write_reg(info, RRC, rx_active_fifo_level);
4643
4644         /* TRC0 Transmit Ready Control 0
4645          *
4646          * 07..05  Reserved, must be 0
4647          * 04..00  TRC<4..0> Tx FIFO trigger active
4648          */
4649         write_reg(info, TRC0, tx_active_fifo_level);
4650
4651         /* TRC1 Transmit Ready Control 1
4652          *
4653          * 07..05  Reserved, must be 0
4654          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4655          */
4656         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4657
4658         /* DMR, DMA Mode Register
4659          *
4660          * 07..05  Reserved, must be 0
4661          * 04      TMOD, Transfer Mode: 1=chained-block
4662          * 03      Reserved, must be 0
4663          * 02      NF, Number of Frames: 1=multi-frame
4664          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4665          * 00      Reserved, must be 0
4666          *
4667          * 0001 0100
4668          */
4669         write_reg(info, TXDMA + DMR, 0x14);
4670         write_reg(info, RXDMA + DMR, 0x14);
4671
4672         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4673         write_reg(info, RXDMA + CPB,
4674                 (unsigned char)(info->buffer_list_phys >> 16));
4675
4676         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4677         write_reg(info, TXDMA + CPB,
4678                 (unsigned char)(info->buffer_list_phys >> 16));
4679
4680         /* enable status interrupts. other code enables/disables
4681          * the individual sources for these two interrupt classes.
4682          */
4683         info->ie0_value |= TXINTE + RXINTE;
4684         write_reg(info, IE0, info->ie0_value);
4685
4686         /* CTL, MSCI control register
4687          *
4688          * 07..06  Reserved, set to 0
4689          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4690          * 04      IDLC, idle control, 0=mark 1=idle register
4691          * 03      BRK, break, 0=off 1 =on (async)
4692          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4693          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4694          * 00      RTS, RTS output control, 0=active 1=inactive
4695          *
4696          * 0001 0001
4697          */
4698         RegValue = 0x10;
4699         if (!(info->serial_signals & SerialSignal_RTS))
4700                 RegValue |= 0x01;
4701         write_reg(info, CTL, RegValue);
4702
4703         /* preamble not supported ! */
4704
4705         tx_set_idle(info);
4706         tx_stop(info);
4707         rx_stop(info);
4708
4709         set_rate(info, info->params.clock_speed);
4710
4711         if (info->params.loopback)
4712                 enable_loopback(info,1);
4713 }
4714
4715 /* Set the transmit HDLC idle mode
4716  */
4717 static void tx_set_idle(SLMP_INFO *info)
4718 {
4719         unsigned char RegValue = 0xff;
4720
4721         /* Map API idle mode to SCA register bits */
4722         switch(info->idle_mode) {
4723         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4724         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4725         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4726         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4727         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4728         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4729         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4730         }
4731
4732         write_reg(info, IDL, RegValue);
4733 }
4734
4735 /* Query the adapter for the state of the V24 status (input) signals.
4736  */
4737 static void get_signals(SLMP_INFO *info)
4738 {
4739         u16 status = read_reg(info, SR3);
4740         u16 gpstatus = read_status_reg(info);
4741         u16 testbit;
4742
4743         /* clear all serial signals except RTS and DTR */
4744         info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
4745
4746         /* set serial signal bits to reflect MISR */
4747
4748         if (!(status & BIT3))
4749                 info->serial_signals |= SerialSignal_CTS;
4750
4751         if ( !(status & BIT2))
4752                 info->serial_signals |= SerialSignal_DCD;
4753
4754         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4755         if (!(gpstatus & testbit))
4756                 info->serial_signals |= SerialSignal_RI;
4757
4758         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4759         if (!(gpstatus & testbit))
4760                 info->serial_signals |= SerialSignal_DSR;
4761 }
4762
4763 /* Set the state of RTS and DTR based on contents of
4764  * serial_signals member of device context.
4765  */
4766 static void set_signals(SLMP_INFO *info)
4767 {
4768         unsigned char RegValue;
4769         u16 EnableBit;
4770
4771         RegValue = read_reg(info, CTL);
4772         if (info->serial_signals & SerialSignal_RTS)
4773                 RegValue &= ~BIT0;
4774         else
4775                 RegValue |= BIT0;
4776         write_reg(info, CTL, RegValue);
4777
4778         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4779         EnableBit = BIT1 << (info->port_num*2);
4780         if (info->serial_signals & SerialSignal_DTR)
4781                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4782         else
4783                 info->port_array[0]->ctrlreg_value |= EnableBit;
4784         write_control_reg(info);
4785 }
4786
4787 /*******************/
4788 /* DMA Buffer Code */
4789 /*******************/
4790
4791 /* Set the count for all receive buffers to SCABUFSIZE
4792  * and set the current buffer to the first buffer. This effectively
4793  * makes all buffers free and discards any data in buffers.
4794  */
4795 static void rx_reset_buffers(SLMP_INFO *info)
4796 {
4797         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4798 }
4799
4800 /* Free the buffers used by a received frame
4801  *
4802  * info   pointer to device instance data
4803  * first  index of 1st receive buffer of frame
4804  * last   index of last receive buffer of frame
4805  */
4806 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4807 {
4808         bool done = false;
4809
4810         while(!done) {
4811                 /* reset current buffer for reuse */
4812                 info->rx_buf_list[first].status = 0xff;
4813
4814                 if (first == last) {
4815                         done = true;
4816                         /* set new last rx descriptor address */
4817                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4818                 }
4819
4820                 first++;
4821                 if (first == info->rx_buf_count)
4822                         first = 0;
4823         }
4824
4825         /* set current buffer to next buffer after last buffer of frame */
4826         info->current_rx_buf = first;
4827 }
4828
4829 /* Return a received frame from the receive DMA buffers.
4830  * Only frames received without errors are returned.
4831  *
4832  * Return Value:        true if frame returned, otherwise false
4833  */
4834 static bool rx_get_frame(SLMP_INFO *info)
4835 {
4836         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4837         unsigned short status;
4838         unsigned int framesize = 0;
4839         bool ReturnCode = false;
4840         unsigned long flags;
4841         struct tty_struct *tty = info->port.tty;
4842         unsigned char addr_field = 0xff;
4843         SCADESC *desc;
4844         SCADESC_EX *desc_ex;
4845
4846 CheckAgain:
4847         /* assume no frame returned, set zero length */
4848         framesize = 0;
4849         addr_field = 0xff;
4850
4851         /*
4852          * current_rx_buf points to the 1st buffer of the next available
4853          * receive frame. To find the last buffer of the frame look for
4854          * a non-zero status field in the buffer entries. (The status
4855          * field is set by the 16C32 after completing a receive frame.
4856          */
4857         StartIndex = EndIndex = info->current_rx_buf;
4858
4859         for ( ;; ) {
4860                 desc = &info->rx_buf_list[EndIndex];
4861                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4862
4863                 if (desc->status == 0xff)
4864                         goto Cleanup;   /* current desc still in use, no frames available */
4865
4866                 if (framesize == 0 && info->params.addr_filter != 0xff)
4867                         addr_field = desc_ex->virt_addr[0];
4868
4869                 framesize += desc->length;
4870
4871                 /* Status != 0 means last buffer of frame */
4872                 if (desc->status)
4873                         break;
4874
4875                 EndIndex++;
4876                 if (EndIndex == info->rx_buf_count)
4877                         EndIndex = 0;
4878
4879                 if (EndIndex == info->current_rx_buf) {
4880                         /* all buffers have been 'used' but none mark      */
4881                         /* the end of a frame. Reset buffers and receiver. */
4882                         if ( info->rx_enabled ){
4883                                 spin_lock_irqsave(&info->lock,flags);
4884                                 rx_start(info);
4885                                 spin_unlock_irqrestore(&info->lock,flags);
4886                         }
4887                         goto Cleanup;
4888                 }
4889
4890         }
4891
4892         /* check status of receive frame */
4893
4894         /* frame status is byte stored after frame data
4895          *
4896          * 7 EOM (end of msg), 1 = last buffer of frame
4897          * 6 Short Frame, 1 = short frame
4898          * 5 Abort, 1 = frame aborted
4899          * 4 Residue, 1 = last byte is partial
4900          * 3 Overrun, 1 = overrun occurred during frame reception
4901          * 2 CRC,     1 = CRC error detected
4902          *
4903          */
4904         status = desc->status;
4905
4906         /* ignore CRC bit if not using CRC (bit is undefined) */
4907         /* Note:CRC is not save to data buffer */
4908         if (info->params.crc_type == HDLC_CRC_NONE)
4909                 status &= ~BIT2;
4910
4911         if (framesize == 0 ||
4912                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4913                 /* discard 0 byte frames, this seems to occur sometime
4914                  * when remote is idling flags.
4915                  */
4916                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4917                 goto CheckAgain;
4918         }
4919
4920         if (framesize < 2)
4921                 status |= BIT6;
4922
4923         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4924                 /* received frame has errors,
4925                  * update counts and mark frame size as 0
4926                  */
4927                 if (status & BIT6)
4928                         info->icount.rxshort++;
4929                 else if (status & BIT5)
4930                         info->icount.rxabort++;
4931                 else if (status & BIT3)
4932                         info->icount.rxover++;
4933                 else
4934                         info->icount.rxcrc++;
4935
4936                 framesize = 0;
4937 #if SYNCLINK_GENERIC_HDLC
4938                 {
4939                         info->netdev->stats.rx_errors++;
4940                         info->netdev->stats.rx_frame_errors++;
4941                 }
4942 #endif
4943         }
4944
4945         if ( debug_level >= DEBUG_LEVEL_BH )
4946                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4947                         __FILE__,__LINE__,info->device_name,status,framesize);
4948
4949         if ( debug_level >= DEBUG_LEVEL_DATA )
4950                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4951                         min_t(unsigned int, framesize, SCABUFSIZE), 0);
4952
4953         if (framesize) {
4954                 if (framesize > info->max_frame_size)
4955                         info->icount.rxlong++;
4956                 else {
4957                         /* copy dma buffer(s) to contiguous intermediate buffer */
4958                         int copy_count = framesize;
4959                         int index = StartIndex;
4960                         unsigned char *ptmp = info->tmp_rx_buf;
4961                         info->tmp_rx_buf_count = framesize;
4962
4963                         info->icount.rxok++;
4964
4965                         while(copy_count) {
4966                                 int partial_count = min(copy_count,SCABUFSIZE);
4967                                 memcpy( ptmp,
4968                                         info->rx_buf_list_ex[index].virt_addr,
4969                                         partial_count );
4970                                 ptmp += partial_count;
4971                                 copy_count -= partial_count;
4972
4973                                 if ( ++index == info->rx_buf_count )
4974                                         index = 0;
4975                         }
4976
4977 #if SYNCLINK_GENERIC_HDLC
4978                         if (info->netcount)
4979                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4980                         else
4981 #endif
4982                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
4983                                                   info->flag_buf, framesize);
4984                 }
4985         }
4986         /* Free the buffers used by this frame. */
4987         rx_free_frame_buffers( info, StartIndex, EndIndex );
4988
4989         ReturnCode = true;
4990
4991 Cleanup:
4992         if ( info->rx_enabled && info->rx_overflow ) {
4993                 /* Receiver is enabled, but needs to restarted due to
4994                  * rx buffer overflow. If buffers are empty, restart receiver.
4995                  */
4996                 if (info->rx_buf_list[EndIndex].status == 0xff) {
4997                         spin_lock_irqsave(&info->lock,flags);
4998                         rx_start(info);
4999                         spin_unlock_irqrestore(&info->lock,flags);
5000                 }
5001         }
5002
5003         return ReturnCode;
5004 }
5005
5006 /* load the transmit DMA buffer with data
5007  */
5008 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5009 {
5010         unsigned short copy_count;
5011         unsigned int i = 0;
5012         SCADESC *desc;
5013         SCADESC_EX *desc_ex;
5014
5015         if ( debug_level >= DEBUG_LEVEL_DATA )
5016                 trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
5017
5018         /* Copy source buffer to one or more DMA buffers, starting with
5019          * the first transmit dma buffer.
5020          */
5021         for(i=0;;)
5022         {
5023                 copy_count = min_t(unsigned int, count, SCABUFSIZE);
5024
5025                 desc = &info->tx_buf_list[i];
5026                 desc_ex = &info->tx_buf_list_ex[i];
5027
5028                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5029
5030                 desc->length = copy_count;
5031                 desc->status = 0;
5032
5033                 buf += copy_count;
5034                 count -= copy_count;
5035
5036                 if (!count)
5037                         break;
5038
5039                 i++;
5040                 if (i >= info->tx_buf_count)
5041                         i = 0;
5042         }
5043
5044         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5045         info->last_tx_buf = ++i;
5046 }
5047
5048 static bool register_test(SLMP_INFO *info)
5049 {
5050         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5051         static unsigned int count = ARRAY_SIZE(testval);
5052         unsigned int i;
5053         bool rc = true;
5054         unsigned long flags;
5055
5056         spin_lock_irqsave(&info->lock,flags);
5057         reset_port(info);
5058
5059         /* assume failure */
5060         info->init_error = DiagStatus_AddressFailure;
5061
5062         /* Write bit patterns to various registers but do it out of */
5063         /* sync, then read back and verify values. */
5064
5065         for (i = 0 ; i < count ; i++) {
5066                 write_reg(info, TMC, testval[i]);
5067                 write_reg(info, IDL, testval[(i+1)%count]);
5068                 write_reg(info, SA0, testval[(i+2)%count]);
5069                 write_reg(info, SA1, testval[(i+3)%count]);
5070
5071                 if ( (read_reg(info, TMC) != testval[i]) ||
5072                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5073                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5074                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5075                 {
5076                         rc = false;
5077                         break;
5078                 }
5079         }
5080
5081         reset_port(info);
5082         spin_unlock_irqrestore(&info->lock,flags);
5083
5084         return rc;
5085 }
5086
5087 static bool irq_test(SLMP_INFO *info)
5088 {
5089         unsigned long timeout;
5090         unsigned long flags;
5091
5092         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5093
5094         spin_lock_irqsave(&info->lock,flags);
5095         reset_port(info);
5096
5097         /* assume failure */
5098         info->init_error = DiagStatus_IrqFailure;
5099         info->irq_occurred = false;
5100
5101         /* setup timer0 on SCA0 to interrupt */
5102
5103         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5104         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5105
5106         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5107         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5108
5109
5110         /* TMCS, Timer Control/Status Register
5111          *
5112          * 07      CMF, Compare match flag (read only) 1=match
5113          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5114          * 05      Reserved, must be 0
5115          * 04      TME, Timer Enable
5116          * 03..00  Reserved, must be 0
5117          *
5118          * 0101 0000
5119          */
5120         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5121
5122         spin_unlock_irqrestore(&info->lock,flags);
5123
5124         timeout=100;
5125         while( timeout-- && !info->irq_occurred ) {
5126                 msleep_interruptible(10);
5127         }
5128
5129         spin_lock_irqsave(&info->lock,flags);
5130         reset_port(info);
5131         spin_unlock_irqrestore(&info->lock,flags);
5132
5133         return info->irq_occurred;
5134 }
5135
5136 /* initialize individual SCA device (2 ports)
5137  */
5138 static bool sca_init(SLMP_INFO *info)
5139 {
5140         /* set wait controller to single mem partition (low), no wait states */
5141         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5142         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5143         write_reg(info, WCRL, 0);       /* wait controller low range */
5144         write_reg(info, WCRM, 0);       /* wait controller mid range */
5145         write_reg(info, WCRH, 0);       /* wait controller high range */
5146
5147         /* DPCR, DMA Priority Control
5148          *
5149          * 07..05  Not used, must be 0
5150          * 04      BRC, bus release condition: 0=all transfers complete
5151          * 03      CCC, channel change condition: 0=every cycle
5152          * 02..00  PR<2..0>, priority 100=round robin
5153          *
5154          * 00000100 = 0x04
5155          */
5156         write_reg(info, DPCR, dma_priority);
5157
5158         /* DMA Master Enable, BIT7: 1=enable all channels */
5159         write_reg(info, DMER, 0x80);
5160
5161         /* enable all interrupt classes */
5162         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5163         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5164         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5165
5166         /* ITCR, interrupt control register
5167          * 07      IPC, interrupt priority, 0=MSCI->DMA
5168          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5169          * 04      VOS, Vector Output, 0=unmodified vector
5170          * 03..00  Reserved, must be 0
5171          */
5172         write_reg(info, ITCR, 0);
5173
5174         return true;
5175 }
5176
5177 /* initialize adapter hardware
5178  */
5179 static bool init_adapter(SLMP_INFO *info)
5180 {
5181         int i;
5182
5183         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5184         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5185         u32 readval;
5186
5187         info->misc_ctrl_value |= BIT30;
5188         *MiscCtrl = info->misc_ctrl_value;
5189
5190         /*
5191          * Force at least 170ns delay before clearing
5192          * reset bit. Each read from LCR takes at least
5193          * 30ns so 10 times for 300ns to be safe.
5194          */
5195         for(i=0;i<10;i++)
5196                 readval = *MiscCtrl;
5197
5198         info->misc_ctrl_value &= ~BIT30;
5199         *MiscCtrl = info->misc_ctrl_value;
5200
5201         /* init control reg (all DTRs off, all clksel=input) */
5202         info->ctrlreg_value = 0xaa;
5203         write_control_reg(info);
5204
5205         {
5206                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5207                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5208
5209                 switch(read_ahead_count)
5210                 {
5211                 case 16:
5212                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5213                         break;
5214                 case 8:
5215                         lcr1_brdr_value |= BIT5 + BIT4;
5216                         break;
5217                 case 4:
5218                         lcr1_brdr_value |= BIT5 + BIT3;
5219                         break;
5220                 case 0:
5221                         lcr1_brdr_value |= BIT5;
5222                         break;
5223                 }
5224
5225                 *LCR1BRDR = lcr1_brdr_value;
5226                 *MiscCtrl = misc_ctrl_value;
5227         }
5228
5229         sca_init(info->port_array[0]);
5230         sca_init(info->port_array[2]);
5231
5232         return true;
5233 }
5234
5235 /* Loopback an HDLC frame to test the hardware
5236  * interrupt and DMA functions.
5237  */
5238 static bool loopback_test(SLMP_INFO *info)
5239 {
5240 #define TESTFRAMESIZE 20
5241
5242         unsigned long timeout;
5243         u16 count = TESTFRAMESIZE;
5244         unsigned char buf[TESTFRAMESIZE];
5245         bool rc = false;
5246         unsigned long flags;
5247
5248         struct tty_struct *oldtty = info->port.tty;
5249         u32 speed = info->params.clock_speed;
5250
5251         info->params.clock_speed = 3686400;
5252         info->port.tty = NULL;
5253
5254         /* assume failure */
5255         info->init_error = DiagStatus_DmaFailure;
5256
5257         /* build and send transmit frame */
5258         for (count = 0; count < TESTFRAMESIZE;++count)
5259                 buf[count] = (unsigned char)count;
5260
5261         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5262
5263         /* program hardware for HDLC and enabled receiver */
5264         spin_lock_irqsave(&info->lock,flags);
5265         hdlc_mode(info);
5266         enable_loopback(info,1);
5267         rx_start(info);
5268         info->tx_count = count;
5269         tx_load_dma_buffer(info,buf,count);
5270         tx_start(info);
5271         spin_unlock_irqrestore(&info->lock,flags);
5272
5273         /* wait for receive complete */
5274         /* Set a timeout for waiting for interrupt. */
5275         for ( timeout = 100; timeout; --timeout ) {
5276                 msleep_interruptible(10);
5277
5278                 if (rx_get_frame(info)) {
5279                         rc = true;
5280                         break;
5281                 }
5282         }
5283
5284         /* verify received frame length and contents */
5285         if (rc &&
5286             ( info->tmp_rx_buf_count != count ||
5287               memcmp(buf, info->tmp_rx_buf,count))) {
5288                 rc = false;
5289         }
5290
5291         spin_lock_irqsave(&info->lock,flags);
5292         reset_adapter(info);
5293         spin_unlock_irqrestore(&info->lock,flags);
5294
5295         info->params.clock_speed = speed;
5296         info->port.tty = oldtty;
5297
5298         return rc;
5299 }
5300
5301 /* Perform diagnostics on hardware
5302  */
5303 static int adapter_test( SLMP_INFO *info )
5304 {
5305         unsigned long flags;
5306         if ( debug_level >= DEBUG_LEVEL_INFO )
5307                 printk( "%s(%d):Testing device %s\n",
5308                         __FILE__,__LINE__,info->device_name );
5309
5310         spin_lock_irqsave(&info->lock,flags);
5311         init_adapter(info);
5312         spin_unlock_irqrestore(&info->lock,flags);
5313
5314         info->port_array[0]->port_count = 0;
5315
5316         if ( register_test(info->port_array[0]) &&
5317                 register_test(info->port_array[1])) {
5318
5319                 info->port_array[0]->port_count = 2;
5320
5321                 if ( register_test(info->port_array[2]) &&
5322                         register_test(info->port_array[3]) )
5323                         info->port_array[0]->port_count += 2;
5324         }
5325         else {
5326                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5327                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5328                 return -ENODEV;
5329         }
5330
5331         if ( !irq_test(info->port_array[0]) ||
5332                 !irq_test(info->port_array[1]) ||
5333                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5334                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5335                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5336                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5337                 return -ENODEV;
5338         }
5339
5340         if (!loopback_test(info->port_array[0]) ||
5341                 !loopback_test(info->port_array[1]) ||
5342                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5343                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5344                 printk( "%s(%d):DMA test failure for device %s\n",
5345                         __FILE__,__LINE__,info->device_name);
5346                 return -ENODEV;
5347         }
5348
5349         if ( debug_level >= DEBUG_LEVEL_INFO )
5350                 printk( "%s(%d):device %s passed diagnostics\n",
5351                         __FILE__,__LINE__,info->device_name );
5352
5353         info->port_array[0]->init_error = 0;
5354         info->port_array[1]->init_error = 0;
5355         if ( info->port_count > 2 ) {
5356                 info->port_array[2]->init_error = 0;
5357                 info->port_array[3]->init_error = 0;
5358         }
5359
5360         return 0;
5361 }
5362
5363 /* Test the shared memory on a PCI adapter.
5364  */
5365 static bool memory_test(SLMP_INFO *info)
5366 {
5367         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5368                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5369         unsigned long count = ARRAY_SIZE(testval);
5370         unsigned long i;
5371         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5372         unsigned long * addr = (unsigned long *)info->memory_base;
5373
5374         /* Test data lines with test pattern at one location. */
5375
5376         for ( i = 0 ; i < count ; i++ ) {
5377                 *addr = testval[i];
5378                 if ( *addr != testval[i] )
5379                         return false;
5380         }
5381
5382         /* Test address lines with incrementing pattern over */
5383         /* entire address range. */
5384
5385         for ( i = 0 ; i < limit ; i++ ) {
5386                 *addr = i * 4;
5387                 addr++;
5388         }
5389
5390         addr = (unsigned long *)info->memory_base;
5391
5392         for ( i = 0 ; i < limit ; i++ ) {
5393                 if ( *addr != i * 4 )
5394                         return false;
5395                 addr++;
5396         }
5397
5398         memset( info->memory_base, 0, SCA_MEM_SIZE );
5399         return true;
5400 }
5401
5402 /* Load data into PCI adapter shared memory.
5403  *
5404  * The PCI9050 releases control of the local bus
5405  * after completing the current read or write operation.
5406  *
5407  * While the PCI9050 write FIFO not empty, the
5408  * PCI9050 treats all of the writes as a single transaction
5409  * and does not release the bus. This causes DMA latency problems
5410  * at high speeds when copying large data blocks to the shared memory.
5411  *
5412  * This function breaks a write into multiple transations by
5413  * interleaving a read which flushes the write FIFO and 'completes'
5414  * the write transation. This allows any pending DMA request to gain control
5415  * of the local bus in a timely fasion.
5416  */
5417 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5418 {
5419         /* A load interval of 16 allows for 4 32-bit writes at */
5420         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5421
5422         unsigned short interval = count / sca_pci_load_interval;
5423         unsigned short i;
5424
5425         for ( i = 0 ; i < interval ; i++ )
5426         {
5427                 memcpy(dest, src, sca_pci_load_interval);
5428                 read_status_reg(info);
5429                 dest += sca_pci_load_interval;
5430                 src += sca_pci_load_interval;
5431         }
5432
5433         memcpy(dest, src, count % sca_pci_load_interval);
5434 }
5435
5436 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5437 {
5438         int i;
5439         int linecount;
5440         if (xmit)
5441                 printk("%s tx data:\n",info->device_name);
5442         else
5443                 printk("%s rx data:\n",info->device_name);
5444
5445         while(count) {
5446                 if (count > 16)
5447                         linecount = 16;
5448                 else
5449                         linecount = count;
5450
5451                 for(i=0;i<linecount;i++)
5452                         printk("%02X ",(unsigned char)data[i]);
5453                 for(;i<17;i++)
5454                         printk("   ");
5455                 for(i=0;i<linecount;i++) {
5456                         if (data[i]>=040 && data[i]<=0176)
5457                                 printk("%c",data[i]);
5458                         else
5459                                 printk(".");
5460                 }
5461                 printk("\n");
5462
5463                 data  += linecount;
5464                 count -= linecount;
5465         }
5466 }       /* end of trace_block() */
5467
5468 /* called when HDLC frame times out
5469  * update stats and do tx completion processing
5470  */
5471 static void tx_timeout(unsigned long context)
5472 {
5473         SLMP_INFO *info = (SLMP_INFO*)context;
5474         unsigned long flags;
5475
5476         if ( debug_level >= DEBUG_LEVEL_INFO )
5477                 printk( "%s(%d):%s tx_timeout()\n",
5478                         __FILE__,__LINE__,info->device_name);
5479         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5480                 info->icount.txtimeout++;
5481         }
5482         spin_lock_irqsave(&info->lock,flags);
5483         info->tx_active = false;
5484         info->tx_count = info->tx_put = info->tx_get = 0;
5485
5486         spin_unlock_irqrestore(&info->lock,flags);
5487
5488 #if SYNCLINK_GENERIC_HDLC
5489         if (info->netcount)
5490                 hdlcdev_tx_done(info);
5491         else
5492 #endif
5493                 bh_transmit(info);
5494 }
5495
5496 /* called to periodically check the DSR/RI modem signal input status
5497  */
5498 static void status_timeout(unsigned long context)
5499 {
5500         u16 status = 0;
5501         SLMP_INFO *info = (SLMP_INFO*)context;
5502         unsigned long flags;
5503         unsigned char delta;
5504
5505
5506         spin_lock_irqsave(&info->lock,flags);
5507         get_signals(info);
5508         spin_unlock_irqrestore(&info->lock,flags);
5509
5510         /* check for DSR/RI state change */
5511
5512         delta = info->old_signals ^ info->serial_signals;
5513         info->old_signals = info->serial_signals;
5514
5515         if (delta & SerialSignal_DSR)
5516                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5517
5518         if (delta & SerialSignal_RI)
5519                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5520
5521         if (delta & SerialSignal_DCD)
5522                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5523
5524         if (delta & SerialSignal_CTS)
5525                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5526
5527         if (status)
5528                 isr_io_pin(info,status);
5529
5530         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5531 }
5532
5533
5534 /* Register Access Routines -
5535  * All registers are memory mapped
5536  */
5537 #define CALC_REGADDR() \
5538         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5539         if (info->port_num > 1) \
5540                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5541         if ( info->port_num & 1) { \
5542                 if (Addr > 0x7f) \
5543                         RegAddr += 0x40;        /* DMA access */ \
5544                 else if (Addr > 0x1f && Addr < 0x60) \
5545                         RegAddr += 0x20;        /* MSCI access */ \
5546         }
5547
5548
5549 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5550 {
5551         CALC_REGADDR();
5552         return *RegAddr;
5553 }
5554 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5555 {
5556         CALC_REGADDR();
5557         *RegAddr = Value;
5558 }
5559
5560 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5561 {
5562         CALC_REGADDR();
5563         return *((u16 *)RegAddr);
5564 }
5565
5566 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5567 {
5568         CALC_REGADDR();
5569         *((u16 *)RegAddr) = Value;
5570 }
5571
5572 static unsigned char read_status_reg(SLMP_INFO * info)
5573 {
5574         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5575         return *RegAddr;
5576 }
5577
5578 static void write_control_reg(SLMP_INFO * info)
5579 {
5580         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5581         *RegAddr = info->port_array[0]->ctrlreg_value;
5582 }
5583
5584
5585 static int synclinkmp_init_one (struct pci_dev *dev,
5586                                           const struct pci_device_id *ent)
5587 {
5588         if (pci_enable_device(dev)) {
5589                 printk("error enabling pci device %p\n", dev);
5590                 return -EIO;
5591         }
5592         return device_init( ++synclinkmp_adapter_count, dev );
5593 }
5594
5595 static void synclinkmp_remove_one (struct pci_dev *dev)
5596 {
5597 }