drivers/tty/synclink_gt.c

   1 /*
   2  * Device driver for Microgate SyncLink GT serial adapters.
   3  *
   4  * written by Paul Fulghum for Microgate Corporation
   5  * paulkf@microgate.com
   6  *
   7  * Microgate and SyncLink are trademarks of Microgate Corporation
   8  *
   9  * This code is released under the GNU General Public License (GPL)
  10  *
  11  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  12  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  13  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  14  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  15  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  16  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  17  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  18  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  19  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  20  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  21  * OF THE POSSIBILITY OF SUCH DAMAGE.
  22  */
  23
  24 /*
  25  * DEBUG OUTPUT DEFINITIONS
  26  *
  27  * uncomment lines below to enable specific types of debug output
  28  *
  29  * DBGINFO   information - most verbose output
  30  * DBGERR    serious errors
  31  * DBGBH     bottom half service routine debugging
  32  * DBGISR    interrupt service routine debugging
  33  * DBGDATA   output receive and transmit data
  34  * DBGTBUF   output transmit DMA buffers and registers
  35  * DBGRBUF   output receive DMA buffers and registers
  36  */
  37
  38 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
  39 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
  40 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
  41 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
  42 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
  43 /*#define DBGTBUF(info) dump_tbufs(info)*/
  44 /*#define DBGRBUF(info) dump_rbufs(info)*/
  45
  46
  47 #include <linux/module.h>
  48 #include <linux/errno.h>
  49 #include <linux/signal.h>
  50 #include <linux/sched.h>
  51 #include <linux/timer.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/pci.h>
  54 #include <linux/tty.h>
  55 #include <linux/tty_flip.h>
  56 #include <linux/serial.h>
  57 #include <linux/major.h>
  58 #include <linux/string.h>
  59 #include <linux/fcntl.h>
  60 #include <linux/ptrace.h>
  61 #include <linux/ioport.h>
  62 #include <linux/mm.h>
  63 #include <linux/seq_file.h>
  64 #include <linux/slab.h>
  65 #include <linux/netdevice.h>
  66 #include <linux/vmalloc.h>
  67 #include <linux/init.h>
  68 #include <linux/delay.h>
  69 #include <linux/ioctl.h>
  70 #include <linux/termios.h>
  71 #include <linux/bitops.h>
  72 #include <linux/workqueue.h>
  73 #include <linux/hdlc.h>
  74 #include <linux/synclink.h>
  75
  76 #include <asm/io.h>
  77 #include <asm/irq.h>
  78 #include <asm/dma.h>
  79 #include <asm/types.h>
  80 #include <asm/uaccess.h>
  81
  82 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
  83 #define SYNCLINK_GENERIC_HDLC 1
  84 #else
  85 #define SYNCLINK_GENERIC_HDLC 0
  86 #endif
  87
  88 /*
  89  * module identification
  90  */
  91 static char *driver_name     = "SyncLink GT";
  92 static char *tty_driver_name = "synclink_gt";
  93 static char *tty_dev_prefix  = "ttySLG";
  94 MODULE_LICENSE("GPL");
  95 #define MGSL_MAGIC 0x5401
  96 #define MAX_DEVICES 32
  97
  98 static struct pci_device_id pci_table[] = {
  99         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 100         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 101         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 102         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 103         {0,}, /* terminate list */
 104 };
 105 MODULE_DEVICE_TABLE(pci, pci_table);
 106
 107 static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 108 static void remove_one(struct pci_dev *dev);
 109 static struct pci_driver pci_driver = {
 110         .name           = "synclink_gt",
 111         .id_table       = pci_table,
 112         .probe          = init_one,
 113         .remove         = remove_one,
 114 };
 115
 116 static bool pci_registered;
 117
 118 /*
 119  * module configuration and status
 120  */
 121 static struct slgt_info *slgt_device_list;
 122 static int slgt_device_count;
 123
 124 static int ttymajor;
 125 static int debug_level;
 126 static int maxframe[MAX_DEVICES];
 127
 128 module_param(ttymajor, int, 0);
 129 module_param(debug_level, int, 0);
 130 module_param_array(maxframe, int, NULL, 0);
 131
 132 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
 133 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
 134 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
 135
 136 /*
 137  * tty support and callbacks
 138  */
 139 static struct tty_driver *serial_driver;
 140
 141 static int  open(struct tty_struct *tty, struct file * filp);
 142 static void close(struct tty_struct *tty, struct file * filp);
 143 static void hangup(struct tty_struct *tty);
 144 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 145
 146 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 147 static int put_char(struct tty_struct *tty, unsigned char ch);
 148 static void send_xchar(struct tty_struct *tty, char ch);
 149 static void wait_until_sent(struct tty_struct *tty, int timeout);
 150 static int  write_room(struct tty_struct *tty);
 151 static void flush_chars(struct tty_struct *tty);
 152 static void flush_buffer(struct tty_struct *tty);
 153 static void tx_hold(struct tty_struct *tty);
 154 static void tx_release(struct tty_struct *tty);
 155
 156 static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
 157 static int  chars_in_buffer(struct tty_struct *tty);
 158 static void throttle(struct tty_struct * tty);
 159 static void unthrottle(struct tty_struct * tty);
 160 static int set_break(struct tty_struct *tty, int break_state);
 161
 162 /*
 163  * generic HDLC support and callbacks
 164  */
 165 #if SYNCLINK_GENERIC_HDLC
 166 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 167 static void hdlcdev_tx_done(struct slgt_info *info);
 168 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
 169 static int  hdlcdev_init(struct slgt_info *info);
 170 static void hdlcdev_exit(struct slgt_info *info);
 171 #endif
 172
 173
 174 /*
 175  * device specific structures, macros and functions
 176  */
 177
 178 #define SLGT_MAX_PORTS 4
 179 #define SLGT_REG_SIZE  256
 180
 181 /*
 182  * conditional wait facility
 183  */
 184 struct cond_wait {
 185         struct cond_wait *next;
 186         wait_queue_head_t q;
 187         wait_queue_t wait;
 188         unsigned int data;
 189 };
 190 static void init_cond_wait(struct cond_wait *w, unsigned int data);
 191 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
 192 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
 193 static void flush_cond_wait(struct cond_wait **head);
 194
 195 /*
 196  * DMA buffer descriptor and access macros
 197  */
 198 struct slgt_desc
 199 {
 200         __le16 count;
 201         __le16 status;
 202         __le32 pbuf;  /* physical address of data buffer */
 203         __le32 next;  /* physical address of next descriptor */
 204
 205         /* driver book keeping */
 206         char *buf;          /* virtual  address of data buffer */
 207         unsigned int pdesc; /* physical address of this descriptor */
 208         dma_addr_t buf_dma_addr;
 209         unsigned short buf_count;
 210 };
 211
 212 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
 213 #define set_desc_next(a,b) (a).next   = cpu_to_le32((unsigned int)(b))
 214 #define set_desc_count(a,b)(a).count  = cpu_to_le16((unsigned short)(b))
 215 #define set_desc_eof(a,b)  (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
 216 #define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
 217 #define desc_count(a)      (le16_to_cpu((a).count))
 218 #define desc_status(a)     (le16_to_cpu((a).status))
 219 #define desc_complete(a)   (le16_to_cpu((a).status) & BIT15)
 220 #define desc_eof(a)        (le16_to_cpu((a).status) & BIT2)
 221 #define desc_crc_error(a)  (le16_to_cpu((a).status) & BIT1)
 222 #define desc_abort(a)      (le16_to_cpu((a).status) & BIT0)
 223 #define desc_residue(a)    ((le16_to_cpu((a).status) & 0x38) >> 3)
 224
 225 struct _input_signal_events {
 226         int ri_up;
 227         int ri_down;
 228         int dsr_up;
 229         int dsr_down;
 230         int dcd_up;
 231         int dcd_down;
 232         int cts_up;
 233         int cts_down;
 234 };
 235
 236 /*
 237  * device instance data structure
 238  */
 239 struct slgt_info {
 240         void *if_ptr;           /* General purpose pointer (used by SPPP) */
 241         struct tty_port port;
 242
 243         struct slgt_info *next_device;  /* device list link */
 244
 245         int magic;
 246
 247         char device_name[25];
 248         struct pci_dev *pdev;
 249
 250         int port_count;  /* count of ports on adapter */
 251         int adapter_num; /* adapter instance number */
 252         int port_num;    /* port instance number */
 253
 254         /* array of pointers to port contexts on this adapter */
 255         struct slgt_info *port_array[SLGT_MAX_PORTS];
 256
 257         int                     line;           /* tty line instance number */
 258
 259         struct mgsl_icount      icount;
 260
 261         int                     timeout;
 262         int                     x_char;         /* xon/xoff character */
 263         unsigned int            read_status_mask;
 264         unsigned int            ignore_status_mask;
 265
 266         wait_queue_head_t       status_event_wait_q;
 267         wait_queue_head_t       event_wait_q;
 268         struct timer_list       tx_timer;
 269         struct timer_list       rx_timer;
 270
 271         unsigned int            gpio_present;
 272         struct cond_wait        *gpio_wait_q;
 273
 274         spinlock_t lock;        /* spinlock for synchronizing with ISR */
 275
 276         struct work_struct task;
 277         u32 pending_bh;
 278         bool bh_requested;
 279         bool bh_running;
 280
 281         int isr_overflow;
 282         bool irq_requested;     /* true if IRQ requested */
 283         bool irq_occurred;      /* for diagnostics use */
 284
 285         /* device configuration */
 286
 287         unsigned int bus_type;
 288         unsigned int irq_level;
 289         unsigned long irq_flags;
 290
 291         unsigned char __iomem * reg_addr;  /* memory mapped registers address */
 292         u32 phys_reg_addr;
 293         bool reg_addr_requested;
 294
 295         MGSL_PARAMS params;       /* communications parameters */
 296         u32 idle_mode;
 297         u32 max_frame_size;       /* as set by device config */
 298
 299         unsigned int rbuf_fill_level;
 300         unsigned int rx_pio;
 301         unsigned int if_mode;
 302         unsigned int base_clock;
 303         unsigned int xsync;
 304         unsigned int xctrl;
 305
 306         /* device status */
 307
 308         bool rx_enabled;
 309         bool rx_restart;
 310
 311         bool tx_enabled;
 312         bool tx_active;
 313
 314         unsigned char signals;    /* serial signal states */
 315         int init_error;  /* initialization error */
 316
 317         unsigned char *tx_buf;
 318         int tx_count;
 319
 320         char *flag_buf;
 321         bool drop_rts_on_tx_done;
 322         struct  _input_signal_events    input_signal_events;
 323
 324         int dcd_chkcount;       /* check counts to prevent */
 325         int cts_chkcount;       /* too many IRQs if a signal */
 326         int dsr_chkcount;       /* is floating */
 327         int ri_chkcount;
 328
 329         char *bufs;             /* virtual address of DMA buffer lists */
 330         dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
 331
 332         unsigned int rbuf_count;
 333         struct slgt_desc *rbufs;
 334         unsigned int rbuf_current;
 335         unsigned int rbuf_index;
 336         unsigned int rbuf_fill_index;
 337         unsigned short rbuf_fill_count;
 338
 339         unsigned int tbuf_count;
 340         struct slgt_desc *tbufs;
 341         unsigned int tbuf_current;
 342         unsigned int tbuf_start;
 343
 344         unsigned char *tmp_rbuf;
 345         unsigned int tmp_rbuf_count;
 346
 347         /* SPPP/Cisco HDLC device parts */
 348
 349         int netcount;
 350         spinlock_t netlock;
 351 #if SYNCLINK_GENERIC_HDLC
 352         struct net_device *netdev;
 353 #endif
 354
 355 };
 356
 357 static MGSL_PARAMS default_params = {
 358         .mode            = MGSL_MODE_HDLC,
 359         .loopback        = 0,
 360         .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
 361         .encoding        = HDLC_ENCODING_NRZI_SPACE,
 362         .clock_speed     = 0,
 363         .addr_filter     = 0xff,
 364         .crc_type        = HDLC_CRC_16_CCITT,
 365         .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
 366         .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
 367         .data_rate       = 9600,
 368         .data_bits       = 8,
 369         .stop_bits       = 1,
 370         .parity          = ASYNC_PARITY_NONE
 371 };
 372
 373
 374 #define BH_RECEIVE  1
 375 #define BH_TRANSMIT 2
 376 #define BH_STATUS   4
 377 #define IO_PIN_SHUTDOWN_LIMIT 100
 378
 379 #define DMABUFSIZE 256
 380 #define DESC_LIST_SIZE 4096
 381
 382 #define MASK_PARITY  BIT1
 383 #define MASK_FRAMING BIT0
 384 #define MASK_BREAK   BIT14
 385 #define MASK_OVERRUN BIT4
 386
 387 #define GSR   0x00 /* global status */
 388 #define JCR   0x04 /* JTAG control */
 389 #define IODR  0x08 /* GPIO direction */
 390 #define IOER  0x0c /* GPIO interrupt enable */
 391 #define IOVR  0x10 /* GPIO value */
 392 #define IOSR  0x14 /* GPIO interrupt status */
 393 #define TDR   0x80 /* tx data */
 394 #define RDR   0x80 /* rx data */
 395 #define TCR   0x82 /* tx control */
 396 #define TIR   0x84 /* tx idle */
 397 #define TPR   0x85 /* tx preamble */
 398 #define RCR   0x86 /* rx control */
 399 #define VCR   0x88 /* V.24 control */
 400 #define CCR   0x89 /* clock control */
 401 #define BDR   0x8a /* baud divisor */
 402 #define SCR   0x8c /* serial control */
 403 #define SSR   0x8e /* serial status */
 404 #define RDCSR 0x90 /* rx DMA control/status */
 405 #define TDCSR 0x94 /* tx DMA control/status */
 406 #define RDDAR 0x98 /* rx DMA descriptor address */
 407 #define TDDAR 0x9c /* tx DMA descriptor address */
 408 #define XSR   0x40 /* extended sync pattern */
 409 #define XCR   0x44 /* extended control */
 410
 411 #define RXIDLE      BIT14
 412 #define RXBREAK     BIT14
 413 #define IRQ_TXDATA  BIT13
 414 #define IRQ_TXIDLE  BIT12
 415 #define IRQ_TXUNDER BIT11 /* HDLC */
 416 #define IRQ_RXDATA  BIT10
 417 #define IRQ_RXIDLE  BIT9  /* HDLC */
 418 #define IRQ_RXBREAK BIT9  /* async */
 419 #define IRQ_RXOVER  BIT8
 420 #define IRQ_DSR     BIT7
 421 #define IRQ_CTS     BIT6
 422 #define IRQ_DCD     BIT5
 423 #define IRQ_RI      BIT4
 424 #define IRQ_ALL     0x3ff0
 425 #define IRQ_MASTER  BIT0
 426
 427 #define slgt_irq_on(info, mask) \
 428         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
 429 #define slgt_irq_off(info, mask) \
 430         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
 431
 432 static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
 433 static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
 434 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
 435 static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
 436 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
 437 static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
 438
 439 static void  msc_set_vcr(struct slgt_info *info);
 440
 441 static int  startup(struct slgt_info *info);
 442 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
 443 static void shutdown(struct slgt_info *info);
 444 static void program_hw(struct slgt_info *info);
 445 static void change_params(struct slgt_info *info);
 446
 447 static int  register_test(struct slgt_info *info);
 448 static int  irq_test(struct slgt_info *info);
 449 static int  loopback_test(struct slgt_info *info);
 450 static int  adapter_test(struct slgt_info *info);
 451
 452 static void reset_adapter(struct slgt_info *info);
 453 static void reset_port(struct slgt_info *info);
 454 static void async_mode(struct slgt_info *info);
 455 static void sync_mode(struct slgt_info *info);
 456
 457 static void rx_stop(struct slgt_info *info);
 458 static void rx_start(struct slgt_info *info);
 459 static void reset_rbufs(struct slgt_info *info);
 460 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
 461 static void rdma_reset(struct slgt_info *info);
 462 static bool rx_get_frame(struct slgt_info *info);
 463 static bool rx_get_buf(struct slgt_info *info);
 464
 465 static void tx_start(struct slgt_info *info);
 466 static void tx_stop(struct slgt_info *info);
 467 static void tx_set_idle(struct slgt_info *info);
 468 static unsigned int free_tbuf_count(struct slgt_info *info);
 469 static unsigned int tbuf_bytes(struct slgt_info *info);
 470 static void reset_tbufs(struct slgt_info *info);
 471 static void tdma_reset(struct slgt_info *info);
 472 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
 473
 474 static void get_signals(struct slgt_info *info);
 475 static void set_signals(struct slgt_info *info);
 476 static void enable_loopback(struct slgt_info *info);
 477 static void set_rate(struct slgt_info *info, u32 data_rate);
 478
 479 static int  bh_action(struct slgt_info *info);
 480 static void bh_handler(struct work_struct *work);
 481 static void bh_transmit(struct slgt_info *info);
 482 static void isr_serial(struct slgt_info *info);
 483 static void isr_rdma(struct slgt_info *info);
 484 static void isr_txeom(struct slgt_info *info, unsigned short status);
 485 static void isr_tdma(struct slgt_info *info);
 486
 487 static int  alloc_dma_bufs(struct slgt_info *info);
 488 static void free_dma_bufs(struct slgt_info *info);
 489 static int  alloc_desc(struct slgt_info *info);
 490 static void free_desc(struct slgt_info *info);
 491 static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
 492 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
 493
 494 static int  alloc_tmp_rbuf(struct slgt_info *info);
 495 static void free_tmp_rbuf(struct slgt_info *info);
 496
 497 static void tx_timeout(unsigned long context);
 498 static void rx_timeout(unsigned long context);
 499
 500 /*
 501  * ioctl handlers
 502  */
 503 static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
 504 static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
 505 static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
 506 static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
 507 static int  set_txidle(struct slgt_info *info, int idle_mode);
 508 static int  tx_enable(struct slgt_info *info, int enable);
 509 static int  tx_abort(struct slgt_info *info);
 510 static int  rx_enable(struct slgt_info *info, int enable);
 511 static int  modem_input_wait(struct slgt_info *info,int arg);
 512 static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
 513 static int  tiocmget(struct tty_struct *tty);
 514 static int  tiocmset(struct tty_struct *tty,
 515                                 unsigned int set, unsigned int clear);
 516 static int set_break(struct tty_struct *tty, int break_state);
 517 static int  get_interface(struct slgt_info *info, int __user *if_mode);
 518 static int  set_interface(struct slgt_info *info, int if_mode);
 519 static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 520 static int  get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 521 static int  wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 522 static int  get_xsync(struct slgt_info *info, int __user *if_mode);
 523 static int  set_xsync(struct slgt_info *info, int if_mode);
 524 static int  get_xctrl(struct slgt_info *info, int __user *if_mode);
 525 static int  set_xctrl(struct slgt_info *info, int if_mode);
 526
 527 /*
 528  * driver functions
 529  */
 530 static void add_device(struct slgt_info *info);
 531 static void device_init(int adapter_num, struct pci_dev *pdev);
 532 static int  claim_resources(struct slgt_info *info);
 533 static void release_resources(struct slgt_info *info);
 534
 535 /*
 536  * DEBUG OUTPUT CODE
 537  */
 538 #ifndef DBGINFO
 539 #define DBGINFO(fmt)
 540 #endif
 541 #ifndef DBGERR
 542 #define DBGERR(fmt)
 543 #endif
 544 #ifndef DBGBH
 545 #define DBGBH(fmt)
 546 #endif
 547 #ifndef DBGISR
 548 #define DBGISR(fmt)
 549 #endif
 550
 551 #ifdef DBGDATA
 552 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
 553 {
 554         int i;
 555         int linecount;
 556         printk("%s %s data:\n",info->device_name, label);
 557         while(count) {
 558                 linecount = (count > 16) ? 16 : count;
 559                 for(i=0; i < linecount; i++)
 560                         printk("%02X ",(unsigned char)data[i]);
 561                 for(;i<17;i++)
 562                         printk("   ");
 563                 for(i=0;i<linecount;i++) {
 564                         if (data[i]>=040 && data[i]<=0176)
 565                                 printk("%c",data[i]);
 566                         else
 567                                 printk(".");
 568                 }
 569                 printk("\n");
 570                 data  += linecount;
 571                 count -= linecount;
 572         }
 573 }
 574 #else
 575 #define DBGDATA(info, buf, size, label)
 576 #endif
 577
 578 #ifdef DBGTBUF
 579 static void dump_tbufs(struct slgt_info *info)
 580 {
 581         int i;
 582         printk("tbuf_current=%d\n", info->tbuf_current);
 583         for (i=0 ; i < info->tbuf_count ; i++) {
 584                 printk("%d: count=%04X status=%04X\n",
 585                         i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
 586         }
 587 }
 588 #else
 589 #define DBGTBUF(info)
 590 #endif
 591
 592 #ifdef DBGRBUF
 593 static void dump_rbufs(struct slgt_info *info)
 594 {
 595         int i;
 596         printk("rbuf_current=%d\n", info->rbuf_current);
 597         for (i=0 ; i < info->rbuf_count ; i++) {
 598                 printk("%d: count=%04X status=%04X\n",
 599                         i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
 600         }
 601 }
 602 #else
 603 #define DBGRBUF(info)
 604 #endif
 605
 606 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
 607 {
 608 #ifdef SANITY_CHECK
 609         if (!info) {
 610                 printk("null struct slgt_info for (%s) in %s\n", devname, name);
 611                 return 1;
 612         }
 613         if (info->magic != MGSL_MAGIC) {
 614                 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
 615                 return 1;
 616         }
 617 #else
 618         if (!info)
 619                 return 1;
 620 #endif
 621         return 0;
 622 }
 623
 624 /**
 625  * line discipline callback wrappers
 626  *
 627  * The wrappers maintain line discipline references
 628  * while calling into the line discipline.
 629  *
 630  * ldisc_receive_buf  - pass receive data to line discipline
 631  */
 632 static void ldisc_receive_buf(struct tty_struct *tty,
 633                               const __u8 *data, char *flags, int count)
 634 {
 635         struct tty_ldisc *ld;
 636         if (!tty)
 637                 return;
 638         ld = tty_ldisc_ref(tty);
 639         if (ld) {
 640                 if (ld->ops->receive_buf)
 641                         ld->ops->receive_buf(tty, data, flags, count);
 642                 tty_ldisc_deref(ld);
 643         }
 644 }
 645
 646 /* tty callbacks */
 647
 648 static int open(struct tty_struct *tty, struct file *filp)
 649 {
 650         struct slgt_info *info;
 651         int retval, line;
 652         unsigned long flags;
 653
 654         line = tty->index;
 655         if (line >= slgt_device_count) {
 656                 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
 657                 return -ENODEV;
 658         }
 659
 660         info = slgt_device_list;
 661         while(info && info->line != line)
 662                 info = info->next_device;
 663         if (sanity_check(info, tty->name, "open"))
 664                 return -ENODEV;
 665         if (info->init_error) {
 666                 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
 667                 return -ENODEV;
 668         }
 669
 670         tty->driver_data = info;
 671         info->port.tty = tty;
 672
 673         DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
 674
 675         /* If port is closing, signal caller to try again */
 676         if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
 677                 if (info->port.flags & ASYNC_CLOSING)
 678                         interruptible_sleep_on(&info->port.close_wait);
 679                 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
 680                         -EAGAIN : -ERESTARTSYS);
 681                 goto cleanup;
 682         }
 683
 684         mutex_lock(&info->port.mutex);
 685         info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 686
 687         spin_lock_irqsave(&info->netlock, flags);
 688         if (info->netcount) {
 689                 retval = -EBUSY;
 690                 spin_unlock_irqrestore(&info->netlock, flags);
 691                 mutex_unlock(&info->port.mutex);
 692                 goto cleanup;
 693         }
 694         info->port.count++;
 695         spin_unlock_irqrestore(&info->netlock, flags);
 696
 697         if (info->port.count == 1) {
 698                 /* 1st open on this device, init hardware */
 699                 retval = startup(info);
 700                 if (retval < 0) {
 701                         mutex_unlock(&info->port.mutex);
 702                         goto cleanup;
 703                 }
 704         }
 705         mutex_unlock(&info->port.mutex);
 706         retval = block_til_ready(tty, filp, info);
 707         if (retval) {
 708                 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
 709                 goto cleanup;
 710         }
 711
 712         retval = 0;
 713
 714 cleanup:
 715         if (retval) {
 716                 if (tty->count == 1)
 717                         info->port.tty = NULL; /* tty layer will release tty struct */
 718                 if(info->port.count)
 719                         info->port.count--;
 720         }
 721
 722         DBGINFO(("%s open rc=%d\n", info->device_name, retval));
 723         return retval;
 724 }
 725
 726 static void close(struct tty_struct *tty, struct file *filp)
 727 {
 728         struct slgt_info *info = tty->driver_data;
 729
 730         if (sanity_check(info, tty->name, "close"))
 731                 return;
 732         DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
 733
 734         if (tty_port_close_start(&info->port, tty, filp) == 0)
 735                 goto cleanup;
 736
 737         mutex_lock(&info->port.mutex);
 738         if (info->port.flags & ASYNC_INITIALIZED)
 739                 wait_until_sent(tty, info->timeout);
 740         flush_buffer(tty);
 741         tty_ldisc_flush(tty);
 742
 743         shutdown(info);
 744         mutex_unlock(&info->port.mutex);
 745
 746         tty_port_close_end(&info->port, tty);
 747         info->port.tty = NULL;
 748 cleanup:
 749         DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
 750 }
 751
 752 static void hangup(struct tty_struct *tty)
 753 {
 754         struct slgt_info *info = tty->driver_data;
 755         unsigned long flags;
 756
 757         if (sanity_check(info, tty->name, "hangup"))
 758                 return;
 759         DBGINFO(("%s hangup\n", info->device_name));
 760
 761         flush_buffer(tty);
 762
 763         mutex_lock(&info->port.mutex);
 764         shutdown(info);
 765
 766         spin_lock_irqsave(&info->port.lock, flags);
 767         info->port.count = 0;
 768         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
 769         info->port.tty = NULL;
 770         spin_unlock_irqrestore(&info->port.lock, flags);
 771         mutex_unlock(&info->port.mutex);
 772
 773         wake_up_interruptible(&info->port.open_wait);
 774 }
 775
 776 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 777 {
 778         struct slgt_info *info = tty->driver_data;
 779         unsigned long flags;
 780
 781         DBGINFO(("%s set_termios\n", tty->driver->name));
 782
 783         change_params(info);
 784
 785         /* Handle transition to B0 status */
 786         if (old_termios->c_cflag & CBAUD &&
 787             !(tty->termios.c_cflag & CBAUD)) {
 788                 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
 789                 spin_lock_irqsave(&info->lock,flags);
 790                 set_signals(info);
 791                 spin_unlock_irqrestore(&info->lock,flags);
 792         }
 793
 794         /* Handle transition away from B0 status */
 795         if (!(old_termios->c_cflag & CBAUD) &&
 796             tty->termios.c_cflag & CBAUD) {
 797                 info->signals |= SerialSignal_DTR;
 798                 if (!(tty->termios.c_cflag & CRTSCTS) ||
 799                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 800                         info->signals |= SerialSignal_RTS;
 801                 }
 802                 spin_lock_irqsave(&info->lock,flags);
 803                 set_signals(info);
 804                 spin_unlock_irqrestore(&info->lock,flags);
 805         }
 806
 807         /* Handle turning off CRTSCTS */
 808         if (old_termios->c_cflag & CRTSCTS &&
 809             !(tty->termios.c_cflag & CRTSCTS)) {
 810                 tty->hw_stopped = 0;
 811                 tx_release(tty);
 812         }
 813 }
 814
 815 static void update_tx_timer(struct slgt_info *info)
 816 {
 817         /*
 818          * use worst case speed of 1200bps to calculate transmit timeout
 819          * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
 820          */
 821         if (info->params.mode == MGSL_MODE_HDLC) {
 822                 int timeout  = (tbuf_bytes(info) * 7) + 1000;
 823                 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
 824         }
 825 }
 826
 827 static int write(struct tty_struct *tty,
 828                  const unsigned char *buf, int count)
 829 {
 830         int ret = 0;
 831         struct slgt_info *info = tty->driver_data;
 832         unsigned long flags;
 833
 834         if (sanity_check(info, tty->name, "write"))
 835                 return -EIO;
 836
 837         DBGINFO(("%s write count=%d\n", info->device_name, count));
 838
 839         if (!info->tx_buf || (count > info->max_frame_size))
 840                 return -EIO;
 841
 842         if (!count || tty->stopped || tty->hw_stopped)
 843                 return 0;
 844
 845         spin_lock_irqsave(&info->lock, flags);
 846
 847         if (info->tx_count) {
 848                 /* send accumulated data from send_char() */
 849                 if (!tx_load(info, info->tx_buf, info->tx_count))
 850                         goto cleanup;
 851                 info->tx_count = 0;
 852         }
 853
 854         if (tx_load(info, buf, count))
 855                 ret = count;
 856
 857 cleanup:
 858         spin_unlock_irqrestore(&info->lock, flags);
 859         DBGINFO(("%s write rc=%d\n", info->device_name, ret));
 860         return ret;
 861 }
 862
 863 static int put_char(struct tty_struct *tty, unsigned char ch)
 864 {
 865         struct slgt_info *info = tty->driver_data;
 866         unsigned long flags;
 867         int ret = 0;
 868
 869         if (sanity_check(info, tty->name, "put_char"))
 870                 return 0;
 871         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
 872         if (!info->tx_buf)
 873                 return 0;
 874         spin_lock_irqsave(&info->lock,flags);
 875         if (info->tx_count < info->max_frame_size) {
 876                 info->tx_buf[info->tx_count++] = ch;
 877                 ret = 1;
 878         }
 879         spin_unlock_irqrestore(&info->lock,flags);
 880         return ret;
 881 }
 882
 883 static void send_xchar(struct tty_struct *tty, char ch)
 884 {
 885         struct slgt_info *info = tty->driver_data;
 886         unsigned long flags;
 887
 888         if (sanity_check(info, tty->name, "send_xchar"))
 889                 return;
 890         DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
 891         info->x_char = ch;
 892         if (ch) {
 893                 spin_lock_irqsave(&info->lock,flags);
 894                 if (!info->tx_enabled)
 895                         tx_start(info);
 896                 spin_unlock_irqrestore(&info->lock,flags);
 897         }
 898 }
 899
 900 static void wait_until_sent(struct tty_struct *tty, int timeout)
 901 {
 902         struct slgt_info *info = tty->driver_data;
 903         unsigned long orig_jiffies, char_time;
 904
 905         if (!info )
 906                 return;
 907         if (sanity_check(info, tty->name, "wait_until_sent"))
 908                 return;
 909         DBGINFO(("%s wait_until_sent entry\n", info->device_name));
 910         if (!(info->port.flags & ASYNC_INITIALIZED))
 911                 goto exit;
 912
 913         orig_jiffies = jiffies;
 914
 915         /* Set check interval to 1/5 of estimated time to
 916          * send a character, and make it at least 1. The check
 917          * interval should also be less than the timeout.
 918          * Note: use tight timings here to satisfy the NIST-PCTS.
 919          */
 920
 921         if (info->params.data_rate) {
 922                 char_time = info->timeout/(32 * 5);
 923                 if (!char_time)
 924                         char_time++;
 925         } else
 926                 char_time = 1;
 927
 928         if (timeout)
 929                 char_time = min_t(unsigned long, char_time, timeout);
 930
 931         while (info->tx_active) {
 932                 msleep_interruptible(jiffies_to_msecs(char_time));
 933                 if (signal_pending(current))
 934                         break;
 935                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 936                         break;
 937         }
 938 exit:
 939         DBGINFO(("%s wait_until_sent exit\n", info->device_name));
 940 }
 941
 942 static int write_room(struct tty_struct *tty)
 943 {
 944         struct slgt_info *info = tty->driver_data;
 945         int ret;
 946
 947         if (sanity_check(info, tty->name, "write_room"))
 948                 return 0;
 949         ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
 950         DBGINFO(("%s write_room=%d\n", info->device_name, ret));
 951         return ret;
 952 }
 953
 954 static void flush_chars(struct tty_struct *tty)
 955 {
 956         struct slgt_info *info = tty->driver_data;
 957         unsigned long flags;
 958
 959         if (sanity_check(info, tty->name, "flush_chars"))
 960                 return;
 961         DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
 962
 963         if (info->tx_count <= 0 || tty->stopped ||
 964             tty->hw_stopped || !info->tx_buf)
 965                 return;
 966
 967         DBGINFO(("%s flush_chars start transmit\n", info->device_name));
 968
 969         spin_lock_irqsave(&info->lock,flags);
 970         if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
 971                 info->tx_count = 0;
 972         spin_unlock_irqrestore(&info->lock,flags);
 973 }
 974
 975 static void flush_buffer(struct tty_struct *tty)
 976 {
 977         struct slgt_info *info = tty->driver_data;
 978         unsigned long flags;
 979
 980         if (sanity_check(info, tty->name, "flush_buffer"))
 981                 return;
 982         DBGINFO(("%s flush_buffer\n", info->device_name));
 983
 984         spin_lock_irqsave(&info->lock, flags);
 985         info->tx_count = 0;
 986         spin_unlock_irqrestore(&info->lock, flags);
 987
 988         tty_wakeup(tty);
 989 }
 990
 991 /*
 992  * throttle (stop) transmitter
 993  */
 994 static void tx_hold(struct tty_struct *tty)
 995 {
 996         struct slgt_info *info = tty->driver_data;
 997         unsigned long flags;
 998
 999         if (sanity_check(info, tty->name, "tx_hold"))
1000                 return;
1001         DBGINFO(("%s tx_hold\n", info->device_name));
1002         spin_lock_irqsave(&info->lock,flags);
1003         if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1004                 tx_stop(info);
1005         spin_unlock_irqrestore(&info->lock,flags);
1006 }
1007
1008 /*
1009  * release (start) transmitter
1010  */
1011 static void tx_release(struct tty_struct *tty)
1012 {
1013         struct slgt_info *info = tty->driver_data;
1014         unsigned long flags;
1015
1016         if (sanity_check(info, tty->name, "tx_release"))
1017                 return;
1018         DBGINFO(("%s tx_release\n", info->device_name));
1019         spin_lock_irqsave(&info->lock, flags);
1020         if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
1021                 info->tx_count = 0;
1022         spin_unlock_irqrestore(&info->lock, flags);
1023 }
1024
1025 /*
1026  * Service an IOCTL request
1027  *
1028  * Arguments
1029  *
1030  *      tty     pointer to tty instance data
1031  *      cmd     IOCTL command code
1032  *      arg     command argument/context
1033  *
1034  * Return 0 if success, otherwise error code
1035  */
1036 static int ioctl(struct tty_struct *tty,
1037                  unsigned int cmd, unsigned long arg)
1038 {
1039         struct slgt_info *info = tty->driver_data;
1040         void __user *argp = (void __user *)arg;
1041         int ret;
1042
1043         if (sanity_check(info, tty->name, "ioctl"))
1044                 return -ENODEV;
1045         DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1046
1047         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1048             (cmd != TIOCMIWAIT)) {
1049                 if (tty->flags & (1 << TTY_IO_ERROR))
1050                     return -EIO;
1051         }
1052
1053         switch (cmd) {
1054         case MGSL_IOCWAITEVENT:
1055                 return wait_mgsl_event(info, argp);
1056         case TIOCMIWAIT:
1057                 return modem_input_wait(info,(int)arg);
1058         case MGSL_IOCSGPIO:
1059                 return set_gpio(info, argp);
1060         case MGSL_IOCGGPIO:
1061                 return get_gpio(info, argp);
1062         case MGSL_IOCWAITGPIO:
1063                 return wait_gpio(info, argp);
1064         case MGSL_IOCGXSYNC:
1065                 return get_xsync(info, argp);
1066         case MGSL_IOCSXSYNC:
1067                 return set_xsync(info, (int)arg);
1068         case MGSL_IOCGXCTRL:
1069                 return get_xctrl(info, argp);
1070         case MGSL_IOCSXCTRL:
1071                 return set_xctrl(info, (int)arg);
1072         }
1073         mutex_lock(&info->port.mutex);
1074         switch (cmd) {
1075         case MGSL_IOCGPARAMS:
1076                 ret = get_params(info, argp);
1077                 break;
1078         case MGSL_IOCSPARAMS:
1079                 ret = set_params(info, argp);
1080                 break;
1081         case MGSL_IOCGTXIDLE:
1082                 ret = get_txidle(info, argp);
1083                 break;
1084         case MGSL_IOCSTXIDLE:
1085                 ret = set_txidle(info, (int)arg);
1086                 break;
1087         case MGSL_IOCTXENABLE:
1088                 ret = tx_enable(info, (int)arg);
1089                 break;
1090         case MGSL_IOCRXENABLE:
1091                 ret = rx_enable(info, (int)arg);
1092                 break;
1093         case MGSL_IOCTXABORT:
1094                 ret = tx_abort(info);
1095                 break;
1096         case MGSL_IOCGSTATS:
1097                 ret = get_stats(info, argp);
1098                 break;
1099         case MGSL_IOCGIF:
1100                 ret = get_interface(info, argp);
1101                 break;
1102         case MGSL_IOCSIF:
1103                 ret = set_interface(info,(int)arg);
1104                 break;
1105         default:
1106                 ret = -ENOIOCTLCMD;
1107         }
1108         mutex_unlock(&info->port.mutex);
1109         return ret;
1110 }
1111
1112 static int get_icount(struct tty_struct *tty,
1113                                 struct serial_icounter_struct *icount)
1114
1115 {
1116         struct slgt_info *info = tty->driver_data;
1117         struct mgsl_icount cnow;        /* kernel counter temps */
1118         unsigned long flags;
1119
1120         spin_lock_irqsave(&info->lock,flags);
1121         cnow = info->icount;
1122         spin_unlock_irqrestore(&info->lock,flags);
1123
1124         icount->cts = cnow.cts;
1125         icount->dsr = cnow.dsr;
1126         icount->rng = cnow.rng;
1127         icount->dcd = cnow.dcd;
1128         icount->rx = cnow.rx;
1129         icount->tx = cnow.tx;
1130         icount->frame = cnow.frame;
1131         icount->overrun = cnow.overrun;
1132         icount->parity = cnow.parity;
1133         icount->brk = cnow.brk;
1134         icount->buf_overrun = cnow.buf_overrun;
1135
1136         return 0;
1137 }
1138
1139 /*
1140  * support for 32 bit ioctl calls on 64 bit systems
1141  */
1142 #ifdef CONFIG_COMPAT
1143 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1144 {
1145         struct MGSL_PARAMS32 tmp_params;
1146
1147         DBGINFO(("%s get_params32\n", info->device_name));
1148         memset(&tmp_params, 0, sizeof(tmp_params));
1149         tmp_params.mode            = (compat_ulong_t)info->params.mode;
1150         tmp_params.loopback        = info->params.loopback;
1151         tmp_params.flags           = info->params.flags;
1152         tmp_params.encoding        = info->params.encoding;
1153         tmp_params.clock_speed     = (compat_ulong_t)info->params.clock_speed;
1154         tmp_params.addr_filter     = info->params.addr_filter;
1155         tmp_params.crc_type        = info->params.crc_type;
1156         tmp_params.preamble_length = info->params.preamble_length;
1157         tmp_params.preamble        = info->params.preamble;
1158         tmp_params.data_rate       = (compat_ulong_t)info->params.data_rate;
1159         tmp_params.data_bits       = info->params.data_bits;
1160         tmp_params.stop_bits       = info->params.stop_bits;
1161         tmp_params.parity          = info->params.parity;
1162         if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1163                 return -EFAULT;
1164         return 0;
1165 }
1166
1167 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1168 {
1169         struct MGSL_PARAMS32 tmp_params;
1170
1171         DBGINFO(("%s set_params32\n", info->device_name));
1172         if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1173                 return -EFAULT;
1174
1175         spin_lock(&info->lock);
1176         if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1177                 info->base_clock = tmp_params.clock_speed;
1178         } else {
1179                 info->params.mode            = tmp_params.mode;
1180                 info->params.loopback        = tmp_params.loopback;
1181                 info->params.flags           = tmp_params.flags;
1182                 info->params.encoding        = tmp_params.encoding;
1183                 info->params.clock_speed     = tmp_params.clock_speed;
1184                 info->params.addr_filter     = tmp_params.addr_filter;
1185                 info->params.crc_type        = tmp_params.crc_type;
1186                 info->params.preamble_length = tmp_params.preamble_length;
1187                 info->params.preamble        = tmp_params.preamble;
1188                 info->params.data_rate       = tmp_params.data_rate;
1189                 info->params.data_bits       = tmp_params.data_bits;
1190                 info->params.stop_bits       = tmp_params.stop_bits;
1191                 info->params.parity          = tmp_params.parity;
1192         }
1193         spin_unlock(&info->lock);
1194
1195         program_hw(info);
1196
1197         return 0;
1198 }
1199
1200 static long slgt_compat_ioctl(struct tty_struct *tty,
1201                          unsigned int cmd, unsigned long arg)
1202 {
1203         struct slgt_info *info = tty->driver_data;
1204         int rc = -ENOIOCTLCMD;
1205
1206         if (sanity_check(info, tty->name, "compat_ioctl"))
1207                 return -ENODEV;
1208         DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1209
1210         switch (cmd) {
1211
1212         case MGSL_IOCSPARAMS32:
1213                 rc = set_params32(info, compat_ptr(arg));
1214                 break;
1215
1216         case MGSL_IOCGPARAMS32:
1217                 rc = get_params32(info, compat_ptr(arg));
1218                 break;
1219
1220         case MGSL_IOCGPARAMS:
1221         case MGSL_IOCSPARAMS:
1222         case MGSL_IOCGTXIDLE:
1223         case MGSL_IOCGSTATS:
1224         case MGSL_IOCWAITEVENT:
1225         case MGSL_IOCGIF:
1226         case MGSL_IOCSGPIO:
1227         case MGSL_IOCGGPIO:
1228         case MGSL_IOCWAITGPIO:
1229         case MGSL_IOCGXSYNC:
1230         case MGSL_IOCGXCTRL:
1231         case MGSL_IOCSTXIDLE:
1232         case MGSL_IOCTXENABLE:
1233         case MGSL_IOCRXENABLE:
1234         case MGSL_IOCTXABORT:
1235         case TIOCMIWAIT:
1236         case MGSL_IOCSIF:
1237         case MGSL_IOCSXSYNC:
1238         case MGSL_IOCSXCTRL:
1239                 rc = ioctl(tty, cmd, arg);
1240                 break;
1241         }
1242
1243         DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1244         return rc;
1245 }
1246 #else
1247 #define slgt_compat_ioctl NULL
1248 #endif /* ifdef CONFIG_COMPAT */
1249
1250 /*
1251  * proc fs support
1252  */
1253 static inline void line_info(struct seq_file *m, struct slgt_info *info)
1254 {
1255         char stat_buf[30];
1256         unsigned long flags;
1257
1258         seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1259                       info->device_name, info->phys_reg_addr,
1260                       info->irq_level, info->max_frame_size);
1261
1262         /* output current serial signal states */
1263         spin_lock_irqsave(&info->lock,flags);
1264         get_signals(info);
1265         spin_unlock_irqrestore(&info->lock,flags);
1266
1267         stat_buf[0] = 0;
1268         stat_buf[1] = 0;
1269         if (info->signals & SerialSignal_RTS)
1270                 strcat(stat_buf, "|RTS");
1271         if (info->signals & SerialSignal_CTS)
1272                 strcat(stat_buf, "|CTS");
1273         if (info->signals & SerialSignal_DTR)
1274                 strcat(stat_buf, "|DTR");
1275         if (info->signals & SerialSignal_DSR)
1276                 strcat(stat_buf, "|DSR");
1277         if (info->signals & SerialSignal_DCD)
1278                 strcat(stat_buf, "|CD");
1279         if (info->signals & SerialSignal_RI)
1280                 strcat(stat_buf, "|RI");
1281
1282         if (info->params.mode != MGSL_MODE_ASYNC) {
1283                 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1284                                info->icount.txok, info->icount.rxok);
1285                 if (info->icount.txunder)
1286                         seq_printf(m, " txunder:%d", info->icount.txunder);
1287                 if (info->icount.txabort)
1288                         seq_printf(m, " txabort:%d", info->icount.txabort);
1289                 if (info->icount.rxshort)
1290                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
1291                 if (info->icount.rxlong)
1292                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
1293                 if (info->icount.rxover)
1294                         seq_printf(m, " rxover:%d", info->icount.rxover);
1295                 if (info->icount.rxcrc)
1296                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1297         } else {
1298                 seq_printf(m, "\tASYNC tx:%d rx:%d",
1299                                info->icount.tx, info->icount.rx);
1300                 if (info->icount.frame)
1301                         seq_printf(m, " fe:%d", info->icount.frame);
1302                 if (info->icount.parity)
1303                         seq_printf(m, " pe:%d", info->icount.parity);
1304                 if (info->icount.brk)
1305                         seq_printf(m, " brk:%d", info->icount.brk);
1306                 if (info->icount.overrun)
1307                         seq_printf(m, " oe:%d", info->icount.overrun);
1308         }
1309
1310         /* Append serial signal status to end */
1311         seq_printf(m, " %s\n", stat_buf+1);
1312
1313         seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1314                        info->tx_active,info->bh_requested,info->bh_running,
1315                        info->pending_bh);
1316 }
1317
1318 /* Called to print information about devices
1319  */
1320 static int synclink_gt_proc_show(struct seq_file *m, void *v)
1321 {
1322         struct slgt_info *info;
1323
1324         seq_puts(m, "synclink_gt driver\n");
1325
1326         info = slgt_device_list;
1327         while( info ) {
1328                 line_info(m, info);
1329                 info = info->next_device;
1330         }
1331         return 0;
1332 }
1333
1334 static int synclink_gt_proc_open(struct inode *inode, struct file *file)
1335 {
1336         return single_open(file, synclink_gt_proc_show, NULL);
1337 }
1338
1339 static const struct file_operations synclink_gt_proc_fops = {
1340         .owner          = THIS_MODULE,
1341         .open           = synclink_gt_proc_open,
1342         .read           = seq_read,
1343         .llseek         = seq_lseek,
1344         .release        = single_release,
1345 };
1346
1347 /*
1348  * return count of bytes in transmit buffer
1349  */
1350 static int chars_in_buffer(struct tty_struct *tty)
1351 {
1352         struct slgt_info *info = tty->driver_data;
1353         int count;
1354         if (sanity_check(info, tty->name, "chars_in_buffer"))
1355                 return 0;
1356         count = tbuf_bytes(info);
1357         DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1358         return count;
1359 }
1360
1361 /*
1362  * signal remote device to throttle send data (our receive data)
1363  */
1364 static void throttle(struct tty_struct * tty)
1365 {
1366         struct slgt_info *info = tty->driver_data;
1367         unsigned long flags;
1368
1369         if (sanity_check(info, tty->name, "throttle"))
1370                 return;
1371         DBGINFO(("%s throttle\n", info->device_name));
1372         if (I_IXOFF(tty))
1373                 send_xchar(tty, STOP_CHAR(tty));
1374         if (tty->termios.c_cflag & CRTSCTS) {
1375                 spin_lock_irqsave(&info->lock,flags);
1376                 info->signals &= ~SerialSignal_RTS;
1377                 set_signals(info);
1378                 spin_unlock_irqrestore(&info->lock,flags);
1379         }
1380 }
1381
1382 /*
1383  * signal remote device to stop throttling send data (our receive data)
1384  */
1385 static void unthrottle(struct tty_struct * tty)
1386 {
1387         struct slgt_info *info = tty->driver_data;
1388         unsigned long flags;
1389
1390         if (sanity_check(info, tty->name, "unthrottle"))
1391                 return;
1392         DBGINFO(("%s unthrottle\n", info->device_name));
1393         if (I_IXOFF(tty)) {
1394                 if (info->x_char)
1395                         info->x_char = 0;
1396                 else
1397                         send_xchar(tty, START_CHAR(tty));
1398         }
1399         if (tty->termios.c_cflag & CRTSCTS) {
1400                 spin_lock_irqsave(&info->lock,flags);
1401                 info->signals |= SerialSignal_RTS;
1402                 set_signals(info);
1403                 spin_unlock_irqrestore(&info->lock,flags);
1404         }
1405 }
1406
1407 /*
1408  * set or clear transmit break condition
1409  * break_state  -1=set break condition, 0=clear
1410  */
1411 static int set_break(struct tty_struct *tty, int break_state)
1412 {
1413         struct slgt_info *info = tty->driver_data;
1414         unsigned short value;
1415         unsigned long flags;
1416
1417         if (sanity_check(info, tty->name, "set_break"))
1418                 return -EINVAL;
1419         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1420
1421         spin_lock_irqsave(&info->lock,flags);
1422         value = rd_reg16(info, TCR);
1423         if (break_state == -1)
1424                 value |= BIT6;
1425         else
1426                 value &= ~BIT6;
1427         wr_reg16(info, TCR, value);
1428         spin_unlock_irqrestore(&info->lock,flags);
1429         return 0;
1430 }
1431
1432 #if SYNCLINK_GENERIC_HDLC
1433
1434 /**
1435  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1436  * set encoding and frame check sequence (FCS) options
1437  *
1438  * dev       pointer to network device structure
1439  * encoding  serial encoding setting
1440  * parity    FCS setting
1441  *
1442  * returns 0 if success, otherwise error code
1443  */
1444 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1445                           unsigned short parity)
1446 {
1447         struct slgt_info *info = dev_to_port(dev);
1448         unsigned char  new_encoding;
1449         unsigned short new_crctype;
1450
1451         /* return error if TTY interface open */
1452         if (info->port.count)
1453                 return -EBUSY;
1454
1455         DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1456
1457         switch (encoding)
1458         {
1459         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1460         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1461         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1462         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1463         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1464         default: return -EINVAL;
1465         }
1466
1467         switch (parity)
1468         {
1469         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1470         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1471         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1472         default: return -EINVAL;
1473         }
1474
1475         info->params.encoding = new_encoding;
1476         info->params.crc_type = new_crctype;
1477
1478         /* if network interface up, reprogram hardware */
1479         if (info->netcount)
1480                 program_hw(info);
1481
1482         return 0;
1483 }
1484
1485 /**
1486  * called by generic HDLC layer to send frame
1487  *
1488  * skb  socket buffer containing HDLC frame
1489  * dev  pointer to network device structure
1490  */
1491 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1492                                       struct net_device *dev)
1493 {
1494         struct slgt_info *info = dev_to_port(dev);
1495         unsigned long flags;
1496
1497         DBGINFO(("%s hdlc_xmit\n", dev->name));
1498
1499         if (!skb->len)
1500                 return NETDEV_TX_OK;
1501
1502         /* stop sending until this frame completes */
1503         netif_stop_queue(dev);
1504
1505         /* update network statistics */
1506         dev->stats.tx_packets++;
1507         dev->stats.tx_bytes += skb->len;
1508
1509         /* save start time for transmit timeout detection */
1510         dev->trans_start = jiffies;
1511
1512         spin_lock_irqsave(&info->lock, flags);
1513         tx_load(info, skb->data, skb->len);
1514         spin_unlock_irqrestore(&info->lock, flags);
1515
1516         /* done with socket buffer, so free it */
1517         dev_kfree_skb(skb);
1518
1519         return NETDEV_TX_OK;
1520 }
1521
1522 /**
1523  * called by network layer when interface enabled
1524  * claim resources and initialize hardware
1525  *
1526  * dev  pointer to network device structure
1527  *
1528  * returns 0 if success, otherwise error code
1529  */
1530 static int hdlcdev_open(struct net_device *dev)
1531 {
1532         struct slgt_info *info = dev_to_port(dev);
1533         int rc;
1534         unsigned long flags;
1535
1536         if (!try_module_get(THIS_MODULE))
1537                 return -EBUSY;
1538
1539         DBGINFO(("%s hdlcdev_open\n", dev->name));
1540
1541         /* generic HDLC layer open processing */
1542         if ((rc = hdlc_open(dev)))
1543                 return rc;
1544
1545         /* arbitrate between network and tty opens */
1546         spin_lock_irqsave(&info->netlock, flags);
1547         if (info->port.count != 0 || info->netcount != 0) {
1548                 DBGINFO(("%s hdlc_open busy\n", dev->name));
1549                 spin_unlock_irqrestore(&info->netlock, flags);
1550                 return -EBUSY;
1551         }
1552         info->netcount=1;
1553         spin_unlock_irqrestore(&info->netlock, flags);
1554
1555         /* claim resources and init adapter */
1556         if ((rc = startup(info)) != 0) {
1557                 spin_lock_irqsave(&info->netlock, flags);
1558                 info->netcount=0;
1559                 spin_unlock_irqrestore(&info->netlock, flags);
1560                 return rc;
1561         }
1562
1563         /* assert RTS and DTR, apply hardware settings */
1564         info->signals |= SerialSignal_RTS | SerialSignal_DTR;
1565         program_hw(info);
1566
1567         /* enable network layer transmit */
1568         dev->trans_start = jiffies;
1569         netif_start_queue(dev);
1570
1571         /* inform generic HDLC layer of current DCD status */
1572         spin_lock_irqsave(&info->lock, flags);
1573         get_signals(info);
1574         spin_unlock_irqrestore(&info->lock, flags);
1575         if (info->signals & SerialSignal_DCD)
1576                 netif_carrier_on(dev);
1577         else
1578                 netif_carrier_off(dev);
1579         return 0;
1580 }
1581
1582 /**
1583  * called by network layer when interface is disabled
1584  * shutdown hardware and release resources
1585  *
1586  * dev  pointer to network device structure
1587  *
1588  * returns 0 if success, otherwise error code
1589  */
1590 static int hdlcdev_close(struct net_device *dev)
1591 {
1592         struct slgt_info *info = dev_to_port(dev);
1593         unsigned long flags;
1594
1595         DBGINFO(("%s hdlcdev_close\n", dev->name));
1596
1597         netif_stop_queue(dev);
1598
1599         /* shutdown adapter and release resources */
1600         shutdown(info);
1601
1602         hdlc_close(dev);
1603
1604         spin_lock_irqsave(&info->netlock, flags);
1605         info->netcount=0;
1606         spin_unlock_irqrestore(&info->netlock, flags);
1607
1608         module_put(THIS_MODULE);
1609         return 0;
1610 }
1611
1612 /**
1613  * called by network layer to process IOCTL call to network device
1614  *
1615  * dev  pointer to network device structure
1616  * ifr  pointer to network interface request structure
1617  * cmd  IOCTL command code
1618  *
1619  * returns 0 if success, otherwise error code
1620  */
1621 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1622 {
1623         const size_t size = sizeof(sync_serial_settings);
1624         sync_serial_settings new_line;
1625         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1626         struct slgt_info *info = dev_to_port(dev);
1627         unsigned int flags;
1628
1629         DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1630
1631         /* return error if TTY interface open */
1632         if (info->port.count)
1633                 return -EBUSY;
1634
1635         if (cmd != SIOCWANDEV)
1636                 return hdlc_ioctl(dev, ifr, cmd);
1637
1638         memset(&new_line, 0, sizeof(new_line));
1639
1640         switch(ifr->ifr_settings.type) {
1641         case IF_GET_IFACE: /* return current sync_serial_settings */
1642
1643                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1644                 if (ifr->ifr_settings.size < size) {
1645                         ifr->ifr_settings.size = size; /* data size wanted */
1646                         return -ENOBUFS;
1647                 }
1648
1649                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1650                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1651                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1652                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1653
1654                 switch (flags){
1655                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1656                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1657                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1658                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1659                 default: new_line.clock_type = CLOCK_DEFAULT;
1660                 }
1661
1662                 new_line.clock_rate = info->params.clock_speed;
1663                 new_line.loopback   = info->params.loopback ? 1:0;
1664
1665                 if (copy_to_user(line, &new_line, size))
1666                         return -EFAULT;
1667                 return 0;
1668
1669         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1670
1671                 if(!capable(CAP_NET_ADMIN))
1672                         return -EPERM;
1673                 if (copy_from_user(&new_line, line, size))
1674                         return -EFAULT;
1675
1676                 switch (new_line.clock_type)
1677                 {
1678                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1679                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1680                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1681                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1682                 case CLOCK_DEFAULT:  flags = info->params.flags &
1683                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1684                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1685                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1686                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1687                 default: return -EINVAL;
1688                 }
1689
1690                 if (new_line.loopback != 0 && new_line.loopback != 1)
1691                         return -EINVAL;
1692
1693                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1694                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1695                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1696                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1697                 info->params.flags |= flags;
1698
1699                 info->params.loopback = new_line.loopback;
1700
1701                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1702                         info->params.clock_speed = new_line.clock_rate;
1703                 else
1704                         info->params.clock_speed = 0;
1705
1706                 /* if network interface up, reprogram hardware */
1707                 if (info->netcount)
1708                         program_hw(info);
1709                 return 0;
1710
1711         default:
1712                 return hdlc_ioctl(dev, ifr, cmd);
1713         }
1714 }
1715
1716 /**
1717  * called by network layer when transmit timeout is detected
1718  *
1719  * dev  pointer to network device structure
1720  */
1721 static void hdlcdev_tx_timeout(struct net_device *dev)
1722 {
1723         struct slgt_info *info = dev_to_port(dev);
1724         unsigned long flags;
1725
1726         DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1727
1728         dev->stats.tx_errors++;
1729         dev->stats.tx_aborted_errors++;
1730
1731         spin_lock_irqsave(&info->lock,flags);
1732         tx_stop(info);
1733         spin_unlock_irqrestore(&info->lock,flags);
1734
1735         netif_wake_queue(dev);
1736 }
1737
1738 /**
1739  * called by device driver when transmit completes
1740  * reenable network layer transmit if stopped
1741  *
1742  * info  pointer to device instance information
1743  */
1744 static void hdlcdev_tx_done(struct slgt_info *info)
1745 {
1746         if (netif_queue_stopped(info->netdev))
1747                 netif_wake_queue(info->netdev);
1748 }
1749
1750 /**
1751  * called by device driver when frame received
1752  * pass frame to network layer
1753  *
1754  * info  pointer to device instance information
1755  * buf   pointer to buffer contianing frame data
1756  * size  count of data bytes in buf
1757  */
1758 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1759 {
1760         struct sk_buff *skb = dev_alloc_skb(size);
1761         struct net_device *dev = info->netdev;
1762
1763         DBGINFO(("%s hdlcdev_rx\n", dev->name));
1764
1765         if (skb == NULL) {
1766                 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1767                 dev->stats.rx_dropped++;
1768                 return;
1769         }
1770
1771         memcpy(skb_put(skb, size), buf, size);
1772
1773         skb->protocol = hdlc_type_trans(skb, dev);
1774
1775         dev->stats.rx_packets++;
1776         dev->stats.rx_bytes += size;
1777
1778         netif_rx(skb);
1779 }
1780
1781 static const struct net_device_ops hdlcdev_ops = {
1782         .ndo_open       = hdlcdev_open,
1783         .ndo_stop       = hdlcdev_close,
1784         .ndo_change_mtu = hdlc_change_mtu,
1785         .ndo_start_xmit = hdlc_start_xmit,
1786         .ndo_do_ioctl   = hdlcdev_ioctl,
1787         .ndo_tx_timeout = hdlcdev_tx_timeout,
1788 };
1789
1790 /**
1791  * called by device driver when adding device instance
1792  * do generic HDLC initialization
1793  *
1794  * info  pointer to device instance information
1795  *
1796  * returns 0 if success, otherwise error code
1797  */
1798 static int hdlcdev_init(struct slgt_info *info)
1799 {
1800         int rc;
1801         struct net_device *dev;
1802         hdlc_device *hdlc;
1803
1804         /* allocate and initialize network and HDLC layer objects */
1805
1806         if (!(dev = alloc_hdlcdev(info))) {
1807                 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1808                 return -ENOMEM;
1809         }
1810
1811         /* for network layer reporting purposes only */
1812         dev->mem_start = info->phys_reg_addr;
1813         dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1814         dev->irq       = info->irq_level;
1815
1816         /* network layer callbacks and settings */
1817         dev->netdev_ops     = &hdlcdev_ops;
1818         dev->watchdog_timeo = 10 * HZ;
1819         dev->tx_queue_len   = 50;
1820
1821         /* generic HDLC layer callbacks and settings */
1822         hdlc         = dev_to_hdlc(dev);
1823         hdlc->attach = hdlcdev_attach;
1824         hdlc->xmit   = hdlcdev_xmit;
1825
1826         /* register objects with HDLC layer */
1827         if ((rc = register_hdlc_device(dev))) {
1828                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1829                 free_netdev(dev);
1830                 return rc;
1831         }
1832
1833         info->netdev = dev;
1834         return 0;
1835 }
1836
1837 /**
1838  * called by device driver when removing device instance
1839  * do generic HDLC cleanup
1840  *
1841  * info  pointer to device instance information
1842  */
1843 static void hdlcdev_exit(struct slgt_info *info)
1844 {
1845         unregister_hdlc_device(info->netdev);
1846         free_netdev(info->netdev);
1847         info->netdev = NULL;
1848 }
1849
1850 #endif /* ifdef CONFIG_HDLC */
1851
1852 /*
1853  * get async data from rx DMA buffers
1854  */
1855 static void rx_async(struct slgt_info *info)
1856 {
1857         struct mgsl_icount *icount = &info->icount;
1858         unsigned int start, end;
1859         unsigned char *p;
1860         unsigned char status;
1861         struct slgt_desc *bufs = info->rbufs;
1862         int i, count;
1863         int chars = 0;
1864         int stat;
1865         unsigned char ch;
1866
1867         start = end = info->rbuf_current;
1868
1869         while(desc_complete(bufs[end])) {
1870                 count = desc_count(bufs[end]) - info->rbuf_index;
1871                 p     = bufs[end].buf + info->rbuf_index;
1872
1873                 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1874                 DBGDATA(info, p, count, "rx");
1875
1876                 for(i=0 ; i < count; i+=2, p+=2) {
1877                         ch = *p;
1878                         icount->rx++;
1879
1880                         stat = 0;
1881
1882                         if ((status = *(p+1) & (BIT1 + BIT0))) {
1883                                 if (status & BIT1)
1884                                         icount->parity++;
1885                                 else if (status & BIT0)
1886                                         icount->frame++;
1887                                 /* discard char if tty control flags say so */
1888                                 if (status & info->ignore_status_mask)
1889                                         continue;
1890                                 if (status & BIT1)
1891                                         stat = TTY_PARITY;
1892                                 else if (status & BIT0)
1893                                         stat = TTY_FRAME;
1894                         }
1895                         tty_insert_flip_char(&info->port, ch, stat);
1896                         chars++;
1897                 }
1898
1899                 if (i < count) {
1900                         /* receive buffer not completed */
1901                         info->rbuf_index += i;
1902                         mod_timer(&info->rx_timer, jiffies + 1);
1903                         break;
1904                 }
1905
1906                 info->rbuf_index = 0;
1907                 free_rbufs(info, end, end);
1908
1909                 if (++end == info->rbuf_count)
1910                         end = 0;
1911
1912                 /* if entire list searched then no frame available */
1913                 if (end == start)
1914                         break;
1915         }
1916
1917         if (chars)
1918                 tty_flip_buffer_push(&info->port);
1919 }
1920
1921 /*
1922  * return next bottom half action to perform
1923  */
1924 static int bh_action(struct slgt_info *info)
1925 {
1926         unsigned long flags;
1927         int rc;
1928
1929         spin_lock_irqsave(&info->lock,flags);
1930
1931         if (info->pending_bh & BH_RECEIVE) {
1932                 info->pending_bh &= ~BH_RECEIVE;
1933                 rc = BH_RECEIVE;
1934         } else if (info->pending_bh & BH_TRANSMIT) {
1935                 info->pending_bh &= ~BH_TRANSMIT;
1936                 rc = BH_TRANSMIT;
1937         } else if (info->pending_bh & BH_STATUS) {
1938                 info->pending_bh &= ~BH_STATUS;
1939                 rc = BH_STATUS;
1940         } else {
1941                 /* Mark BH routine as complete */
1942                 info->bh_running = false;
1943                 info->bh_requested = false;
1944                 rc = 0;
1945         }
1946
1947         spin_unlock_irqrestore(&info->lock,flags);
1948
1949         return rc;
1950 }
1951
1952 /*
1953  * perform bottom half processing
1954  */
1955 static void bh_handler(struct work_struct *work)
1956 {
1957         struct slgt_info *info = container_of(work, struct slgt_info, task);
1958         int action;
1959
1960         info->bh_running = true;
1961
1962         while((action = bh_action(info))) {
1963                 switch (action) {
1964                 case BH_RECEIVE:
1965                         DBGBH(("%s bh receive\n", info->device_name));
1966                         switch(info->params.mode) {
1967                         case MGSL_MODE_ASYNC:
1968                                 rx_async(info);
1969                                 break;
1970                         case MGSL_MODE_HDLC:
1971                                 while(rx_get_frame(info));
1972                                 break;
1973                         case MGSL_MODE_RAW:
1974                         case MGSL_MODE_MONOSYNC:
1975                         case MGSL_MODE_BISYNC:
1976                         case MGSL_MODE_XSYNC:
1977                                 while(rx_get_buf(info));
1978                                 break;
1979                         }
1980                         /* restart receiver if rx DMA buffers exhausted */
1981                         if (info->rx_restart)
1982                                 rx_start(info);
1983                         break;
1984                 case BH_TRANSMIT:
1985                         bh_transmit(info);
1986                         break;
1987                 case BH_STATUS:
1988                         DBGBH(("%s bh status\n", info->device_name));
1989                         info->ri_chkcount = 0;
1990                         info->dsr_chkcount = 0;
1991                         info->dcd_chkcount = 0;
1992                         info->cts_chkcount = 0;
1993                         break;
1994                 default:
1995                         DBGBH(("%s unknown action\n", info->device_name));
1996                         break;
1997                 }
1998         }
1999         DBGBH(("%s bh_handler exit\n", info->device_name));
2000 }
2001
2002 static void bh_transmit(struct slgt_info *info)
2003 {
2004         struct tty_struct *tty = info->port.tty;
2005
2006         DBGBH(("%s bh_transmit\n", info->device_name));
2007         if (tty)
2008                 tty_wakeup(tty);
2009 }
2010
2011 static void dsr_change(struct slgt_info *info, unsigned short status)
2012 {
2013         if (status & BIT3) {
2014                 info->signals |= SerialSignal_DSR;
2015                 info->input_signal_events.dsr_up++;
2016         } else {
2017                 info->signals &= ~SerialSignal_DSR;
2018                 info->input_signal_events.dsr_down++;
2019         }
2020         DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2021         if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2022                 slgt_irq_off(info, IRQ_DSR);
2023                 return;
2024         }
2025         info->icount.dsr++;
2026         wake_up_interruptible(&info->status_event_wait_q);
2027         wake_up_interruptible(&info->event_wait_q);
2028         info->pending_bh |= BH_STATUS;
2029 }
2030
2031 static void cts_change(struct slgt_info *info, unsigned short status)
2032 {
2033         if (status & BIT2) {
2034                 info->signals |= SerialSignal_CTS;
2035                 info->input_signal_events.cts_up++;
2036         } else {
2037                 info->signals &= ~SerialSignal_CTS;
2038                 info->input_signal_events.cts_down++;
2039         }
2040         DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2041         if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2042                 slgt_irq_off(info, IRQ_CTS);
2043                 return;
2044         }
2045         info->icount.cts++;
2046         wake_up_interruptible(&info->status_event_wait_q);
2047         wake_up_interruptible(&info->event_wait_q);
2048         info->pending_bh |= BH_STATUS;
2049
2050         if (tty_port_cts_enabled(&info->port)) {
2051                 if (info->port.tty) {
2052                         if (info->port.tty->hw_stopped) {
2053                                 if (info->signals & SerialSignal_CTS) {
2054                                         info->port.tty->hw_stopped = 0;
2055                                         info->pending_bh |= BH_TRANSMIT;
2056                                         return;
2057                                 }
2058                         } else {
2059                                 if (!(info->signals & SerialSignal_CTS))
2060                                         info->port.tty->hw_stopped = 1;
2061                         }
2062                 }
2063         }
2064 }
2065
2066 static void dcd_change(struct slgt_info *info, unsigned short status)
2067 {
2068         if (status & BIT1) {
2069                 info->signals |= SerialSignal_DCD;
2070                 info->input_signal_events.dcd_up++;
2071         } else {
2072                 info->signals &= ~SerialSignal_DCD;
2073                 info->input_signal_events.dcd_down++;
2074         }
2075         DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2076         if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2077                 slgt_irq_off(info, IRQ_DCD);
2078                 return;
2079         }
2080         info->icount.dcd++;
2081 #if SYNCLINK_GENERIC_HDLC
2082         if (info->netcount) {
2083                 if (info->signals & SerialSignal_DCD)
2084                         netif_carrier_on(info->netdev);
2085                 else
2086                         netif_carrier_off(info->netdev);
2087         }
2088 #endif
2089         wake_up_interruptible(&info->status_event_wait_q);
2090         wake_up_interruptible(&info->event_wait_q);
2091         info->pending_bh |= BH_STATUS;
2092
2093         if (info->port.flags & ASYNC_CHECK_CD) {
2094                 if (info->signals & SerialSignal_DCD)
2095                         wake_up_interruptible(&info->port.open_wait);
2096                 else {
2097                         if (info->port.tty)
2098                                 tty_hangup(info->port.tty);
2099                 }
2100         }
2101 }
2102
2103 static void ri_change(struct slgt_info *info, unsigned short status)
2104 {
2105         if (status & BIT0) {
2106                 info->signals |= SerialSignal_RI;
2107                 info->input_signal_events.ri_up++;
2108         } else {
2109                 info->signals &= ~SerialSignal_RI;
2110                 info->input_signal_events.ri_down++;
2111         }
2112         DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2113         if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2114                 slgt_irq_off(info, IRQ_RI);
2115                 return;
2116         }
2117         info->icount.rng++;
2118         wake_up_interruptible(&info->status_event_wait_q);
2119         wake_up_interruptible(&info->event_wait_q);
2120         info->pending_bh |= BH_STATUS;
2121 }
2122
2123 static void isr_rxdata(struct slgt_info *info)
2124 {
2125         unsigned int count = info->rbuf_fill_count;
2126         unsigned int i = info->rbuf_fill_index;
2127         unsigned short reg;
2128
2129         while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2130                 reg = rd_reg16(info, RDR);
2131                 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2132                 if (desc_complete(info->rbufs[i])) {
2133                         /* all buffers full */
2134                         rx_stop(info);
2135                         info->rx_restart = 1;
2136                         continue;
2137                 }
2138                 info->rbufs[i].buf[count++] = (unsigned char)reg;
2139                 /* async mode saves status byte to buffer for each data byte */
2140                 if (info->params.mode == MGSL_MODE_ASYNC)
2141                         info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2142                 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2143                         /* buffer full or end of frame */
2144                         set_desc_count(info->rbufs[i], count);
2145                         set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2146                         info->rbuf_fill_count = count = 0;
2147                         if (++i == info->rbuf_count)
2148                                 i = 0;
2149                         info->pending_bh |= BH_RECEIVE;
2150                 }
2151         }
2152
2153         info->rbuf_fill_index = i;
2154         info->rbuf_fill_count = count;
2155 }
2156
2157 static void isr_serial(struct slgt_info *info)
2158 {
2159         unsigned short status = rd_reg16(info, SSR);
2160
2161         DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2162
2163         wr_reg16(info, SSR, status); /* clear pending */
2164
2165         info->irq_occurred = true;
2166
2167         if (info->params.mode == MGSL_MODE_ASYNC) {
2168                 if (status & IRQ_TXIDLE) {
2169                         if (info->tx_active)
2170                                 isr_txeom(info, status);
2171                 }
2172                 if (info->rx_pio && (status & IRQ_RXDATA))
2173                         isr_rxdata(info);
2174                 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2175                         info->icount.brk++;
2176                         /* process break detection if tty control allows */
2177                         if (info->port.tty) {
2178                                 if (!(status & info->ignore_status_mask)) {
2179                                         if (info->read_status_mask & MASK_BREAK) {
2180                                                 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2181                                                 if (info->port.flags & ASYNC_SAK)
2182                                                         do_SAK(info->port.tty);
2183                                         }
2184                                 }
2185                         }
2186                 }
2187         } else {
2188                 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2189                         isr_txeom(info, status);
2190                 if (info->rx_pio && (status & IRQ_RXDATA))
2191                         isr_rxdata(info);
2192                 if (status & IRQ_RXIDLE) {
2193                         if (status & RXIDLE)
2194                                 info->icount.rxidle++;
2195                         else
2196                                 info->icount.exithunt++;
2197                         wake_up_interruptible(&info->event_wait_q);
2198                 }
2199
2200                 if (status & IRQ_RXOVER)
2201                         rx_start(info);
2202         }
2203
2204         if (status & IRQ_DSR)
2205                 dsr_change(info, status);
2206         if (status & IRQ_CTS)
2207                 cts_change(info, status);
2208         if (status & IRQ_DCD)
2209                 dcd_change(info, status);
2210         if (status & IRQ_RI)
2211                 ri_change(info, status);
2212 }
2213
2214 static void isr_rdma(struct slgt_info *info)
2215 {
2216         unsigned int status = rd_reg32(info, RDCSR);
2217
2218         DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2219
2220         /* RDCSR (rx DMA control/status)
2221          *
2222          * 31..07  reserved
2223          * 06      save status byte to DMA buffer
2224          * 05      error
2225          * 04      eol (end of list)
2226          * 03      eob (end of buffer)
2227          * 02      IRQ enable
2228          * 01      reset
2229          * 00      enable
2230          */
2231         wr_reg32(info, RDCSR, status);  /* clear pending */
2232
2233         if (status & (BIT5 + BIT4)) {
2234                 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2235                 info->rx_restart = true;
2236         }
2237         info->pending_bh |= BH_RECEIVE;
2238 }
2239
2240 static void isr_tdma(struct slgt_info *info)
2241 {
2242         unsigned int status = rd_reg32(info, TDCSR);
2243
2244         DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2245
2246         /* TDCSR (tx DMA control/status)
2247          *
2248          * 31..06  reserved
2249          * 05      error
2250          * 04      eol (end of list)
2251          * 03      eob (end of buffer)
2252          * 02      IRQ enable
2253          * 01      reset
2254          * 00      enable
2255          */
2256         wr_reg32(info, TDCSR, status);  /* clear pending */
2257
2258         if (status & (BIT5 + BIT4 + BIT3)) {
2259                 // another transmit buffer has completed
2260                 // run bottom half to get more send data from user
2261                 info->pending_bh |= BH_TRANSMIT;
2262         }
2263 }
2264
2265 /*
2266  * return true if there are unsent tx DMA buffers, otherwise false
2267  *
2268  * if there are unsent buffers then info->tbuf_start
2269  * is set to index of first unsent buffer
2270  */
2271 static bool unsent_tbufs(struct slgt_info *info)
2272 {
2273         unsigned int i = info->tbuf_current;
2274         bool rc = false;
2275
2276         /*
2277          * search backwards from last loaded buffer (precedes tbuf_current)
2278          * for first unsent buffer (desc_count > 0)
2279          */
2280
2281         do {
2282                 if (i)
2283                         i--;
2284                 else
2285                         i = info->tbuf_count - 1;
2286                 if (!desc_count(info->tbufs[i]))
2287                         break;
2288                 info->tbuf_start = i;
2289                 rc = true;
2290         } while (i != info->tbuf_current);
2291
2292         return rc;
2293 }
2294
2295 static void isr_txeom(struct slgt_info *info, unsigned short status)
2296 {
2297         DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2298
2299         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2300         tdma_reset(info);
2301         if (status & IRQ_TXUNDER) {
2302                 unsigned short val = rd_reg16(info, TCR);
2303                 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2304                 wr_reg16(info, TCR, val); /* clear reset bit */
2305         }
2306
2307         if (info->tx_active) {
2308                 if (info->params.mode != MGSL_MODE_ASYNC) {
2309                         if (status & IRQ_TXUNDER)
2310                                 info->icount.txunder++;
2311                         else if (status & IRQ_TXIDLE)
2312                                 info->icount.txok++;
2313                 }
2314
2315                 if (unsent_tbufs(info)) {
2316                         tx_start(info);
2317                         update_tx_timer(info);
2318                         return;
2319                 }
2320                 info->tx_active = false;
2321
2322                 del_timer(&info->tx_timer);
2323
2324                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2325                         info->signals &= ~SerialSignal_RTS;
2326                         info->drop_rts_on_tx_done = false;
2327                         set_signals(info);
2328                 }
2329
2330 #if SYNCLINK_GENERIC_HDLC
2331                 if (info->netcount)
2332                         hdlcdev_tx_done(info);
2333                 else
2334 #endif
2335                 {
2336                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2337                                 tx_stop(info);
2338                                 return;
2339                         }
2340                         info->pending_bh |= BH_TRANSMIT;
2341                 }
2342         }
2343 }
2344
2345 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2346 {
2347         struct cond_wait *w, *prev;
2348
2349         /* wake processes waiting for specific transitions */
2350         for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2351                 if (w->data & changed) {
2352                         w->data = state;
2353                         wake_up_interruptible(&w->q);
2354                         if (prev != NULL)
2355                                 prev->next = w->next;
2356                         else
2357                                 info->gpio_wait_q = w->next;
2358                 } else
2359                         prev = w;
2360         }
2361 }
2362
2363 /* interrupt service routine
2364  *
2365  *      irq     interrupt number
2366  *      dev_id  device ID supplied during interrupt registration
2367  */
2368 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2369 {
2370         struct slgt_info *info = dev_id;
2371         unsigned int gsr;
2372         unsigned int i;
2373
2374         DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2375
2376         while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2377                 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2378                 info->irq_occurred = true;
2379                 for(i=0; i < info->port_count ; i++) {
2380                         if (info->port_array[i] == NULL)
2381                                 continue;
2382                         spin_lock(&info->port_array[i]->lock);
2383                         if (gsr & (BIT8 << i))
2384                                 isr_serial(info->port_array[i]);
2385                         if (gsr & (BIT16 << (i*2)))
2386                                 isr_rdma(info->port_array[i]);
2387                         if (gsr & (BIT17 << (i*2)))
2388                                 isr_tdma(info->port_array[i]);
2389                         spin_unlock(&info->port_array[i]->lock);
2390                 }
2391         }
2392
2393         if (info->gpio_present) {
2394                 unsigned int state;
2395                 unsigned int changed;
2396                 spin_lock(&info->lock);
2397                 while ((changed = rd_reg32(info, IOSR)) != 0) {
2398                         DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2399                         /* read latched state of GPIO signals */
2400                         state = rd_reg32(info, IOVR);
2401                         /* clear pending GPIO interrupt bits */
2402                         wr_reg32(info, IOSR, changed);
2403                         for (i=0 ; i < info->port_count ; i++) {
2404                                 if (info->port_array[i] != NULL)
2405                                         isr_gpio(info->port_array[i], changed, state);
2406                         }
2407                 }
2408                 spin_unlock(&info->lock);
2409         }
2410
2411         for(i=0; i < info->port_count ; i++) {
2412                 struct slgt_info *port = info->port_array[i];
2413                 if (port == NULL)
2414                         continue;
2415                 spin_lock(&port->lock);
2416                 if ((port->port.count || port->netcount) &&
2417                     port->pending_bh && !port->bh_running &&
2418                     !port->bh_requested) {
2419                         DBGISR(("%s bh queued\n", port->device_name));
2420                         schedule_work(&port->task);
2421                         port->bh_requested = true;
2422                 }
2423                 spin_unlock(&port->lock);
2424         }
2425
2426         DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2427         return IRQ_HANDLED;
2428 }
2429
2430 static int startup(struct slgt_info *info)
2431 {
2432         DBGINFO(("%s startup\n", info->device_name));
2433
2434         if (info->port.flags & ASYNC_INITIALIZED)
2435                 return 0;
2436
2437         if (!info->tx_buf) {
2438                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2439                 if (!info->tx_buf) {
2440                         DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2441                         return -ENOMEM;
2442                 }
2443         }
2444
2445         info->pending_bh = 0;
2446
2447         memset(&info->icount, 0, sizeof(info->icount));
2448
2449         /* program hardware for current parameters */
2450         change_params(info);
2451
2452         if (info->port.tty)
2453                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2454
2455         info->port.flags |= ASYNC_INITIALIZED;
2456
2457         return 0;
2458 }
2459
2460 /*
2461  *  called by close() and hangup() to shutdown hardware
2462  */
2463 static void shutdown(struct slgt_info *info)
2464 {
2465         unsigned long flags;
2466
2467         if (!(info->port.flags & ASYNC_INITIALIZED))
2468                 return;
2469
2470         DBGINFO(("%s shutdown\n", info->device_name));
2471
2472         /* clear status wait queue because status changes */
2473         /* can't happen after shutting down the hardware */
2474         wake_up_interruptible(&info->status_event_wait_q);
2475         wake_up_interruptible(&info->event_wait_q);
2476
2477         del_timer_sync(&info->tx_timer);
2478         del_timer_sync(&info->rx_timer);
2479
2480         kfree(info->tx_buf);
2481         info->tx_buf = NULL;
2482
2483         spin_lock_irqsave(&info->lock,flags);
2484
2485         tx_stop(info);
2486         rx_stop(info);
2487
2488         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2489
2490         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2491                 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2492                 set_signals(info);
2493         }
2494
2495         flush_cond_wait(&info->gpio_wait_q);
2496
2497         spin_unlock_irqrestore(&info->lock,flags);
2498
2499         if (info->port.tty)
2500                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2501
2502         info->port.flags &= ~ASYNC_INITIALIZED;
2503 }
2504
2505 static void program_hw(struct slgt_info *info)
2506 {
2507         unsigned long flags;
2508
2509         spin_lock_irqsave(&info->lock,flags);
2510
2511         rx_stop(info);
2512         tx_stop(info);
2513
2514         if (info->params.mode != MGSL_MODE_ASYNC ||
2515             info->netcount)
2516                 sync_mode(info);
2517         else
2518                 async_mode(info);
2519
2520         set_signals(info);
2521
2522         info->dcd_chkcount = 0;
2523         info->cts_chkcount = 0;
2524         info->ri_chkcount = 0;
2525         info->dsr_chkcount = 0;
2526
2527         slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2528         get_signals(info);
2529
2530         if (info->netcount ||
2531             (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2532                 rx_start(info);
2533
2534         spin_unlock_irqrestore(&info->lock,flags);
2535 }
2536
2537 /*
2538  * reconfigure adapter based on new parameters
2539  */
2540 static void change_params(struct slgt_info *info)
2541 {
2542         unsigned cflag;
2543         int bits_per_char;
2544
2545         if (!info->port.tty)
2546                 return;
2547         DBGINFO(("%s change_params\n", info->device_name));
2548
2549         cflag = info->port.tty->termios.c_cflag;
2550
2551         /* if B0 rate (hangup) specified then negate RTS and DTR */
2552         /* otherwise assert RTS and DTR */
2553         if (cflag & CBAUD)
2554                 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
2555         else
2556                 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2557
2558         /* byte size and parity */
2559
2560         switch (cflag & CSIZE) {
2561         case CS5: info->params.data_bits = 5; break;
2562         case CS6: info->params.data_bits = 6; break;
2563         case CS7: info->params.data_bits = 7; break;
2564         case CS8: info->params.data_bits = 8; break;
2565         default:  info->params.data_bits = 7; break;
2566         }
2567
2568         info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2569
2570         if (cflag & PARENB)
2571                 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2572         else
2573                 info->params.parity = ASYNC_PARITY_NONE;
2574
2575         /* calculate number of jiffies to transmit a full
2576          * FIFO (32 bytes) at specified data rate
2577          */
2578         bits_per_char = info->params.data_bits +
2579                         info->params.stop_bits + 1;
2580
2581         info->params.data_rate = tty_get_baud_rate(info->port.tty);
2582
2583         if (info->params.data_rate) {
2584                 info->timeout = (32*HZ*bits_per_char) /
2585                                 info->params.data_rate;
2586         }
2587         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2588
2589         if (cflag & CRTSCTS)
2590                 info->port.flags |= ASYNC_CTS_FLOW;
2591         else
2592                 info->port.flags &= ~ASYNC_CTS_FLOW;
2593
2594         if (cflag & CLOCAL)
2595                 info->port.flags &= ~ASYNC_CHECK_CD;
2596         else
2597                 info->port.flags |= ASYNC_CHECK_CD;
2598
2599         /* process tty input control flags */
2600
2601         info->read_status_mask = IRQ_RXOVER;
2602         if (I_INPCK(info->port.tty))
2603                 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2604         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2605                 info->read_status_mask |= MASK_BREAK;
2606         if (I_IGNPAR(info->port.tty))
2607                 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2608         if (I_IGNBRK(info->port.tty)) {
2609                 info->ignore_status_mask |= MASK_BREAK;
2610                 /* If ignoring parity and break indicators, ignore
2611                  * overruns too.  (For real raw support).
2612                  */
2613                 if (I_IGNPAR(info->port.tty))
2614                         info->ignore_status_mask |= MASK_OVERRUN;
2615         }
2616
2617         program_hw(info);
2618 }
2619
2620 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2621 {
2622         DBGINFO(("%s get_stats\n",  info->device_name));
2623         if (!user_icount) {
2624                 memset(&info->icount, 0, sizeof(info->icount));
2625         } else {
2626                 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2627                         return -EFAULT;
2628         }
2629         return 0;
2630 }
2631
2632 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2633 {
2634         DBGINFO(("%s get_params\n", info->device_name));
2635         if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2636                 return -EFAULT;
2637         return 0;
2638 }
2639
2640 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2641 {
2642         unsigned long flags;
2643         MGSL_PARAMS tmp_params;
2644
2645         DBGINFO(("%s set_params\n", info->device_name));
2646         if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2647                 return -EFAULT;
2648
2649         spin_lock_irqsave(&info->lock, flags);
2650         if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2651                 info->base_clock = tmp_params.clock_speed;
2652         else
2653                 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2654         spin_unlock_irqrestore(&info->lock, flags);
2655
2656         program_hw(info);
2657
2658         return 0;
2659 }
2660
2661 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2662 {
2663         DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2664         if (put_user(info->idle_mode, idle_mode))
2665                 return -EFAULT;
2666         return 0;
2667 }
2668
2669 static int set_txidle(struct slgt_info *info, int idle_mode)
2670 {
2671         unsigned long flags;
2672         DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2673         spin_lock_irqsave(&info->lock,flags);
2674         info->idle_mode = idle_mode;
2675         if (info->params.mode != MGSL_MODE_ASYNC)
2676                 tx_set_idle(info);
2677         spin_unlock_irqrestore(&info->lock,flags);
2678         return 0;
2679 }
2680
2681 static int tx_enable(struct slgt_info *info, int enable)
2682 {
2683         unsigned long flags;
2684         DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2685         spin_lock_irqsave(&info->lock,flags);
2686         if (enable) {
2687                 if (!info->tx_enabled)
2688                         tx_start(info);
2689         } else {
2690                 if (info->tx_enabled)
2691                         tx_stop(info);
2692         }
2693         spin_unlock_irqrestore(&info->lock,flags);
2694         return 0;
2695 }
2696
2697 /*
2698  * abort transmit HDLC frame
2699  */
2700 static int tx_abort(struct slgt_info *info)
2701 {
2702         unsigned long flags;
2703         DBGINFO(("%s tx_abort\n", info->device_name));
2704         spin_lock_irqsave(&info->lock,flags);
2705         tdma_reset(info);
2706         spin_unlock_irqrestore(&info->lock,flags);
2707         return 0;
2708 }
2709
2710 static int rx_enable(struct slgt_info *info, int enable)
2711 {
2712         unsigned long flags;
2713         unsigned int rbuf_fill_level;
2714         DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2715         spin_lock_irqsave(&info->lock,flags);
2716         /*
2717          * enable[31..16] = receive DMA buffer fill level
2718          * 0 = noop (leave fill level unchanged)
2719          * fill level must be multiple of 4 and <= buffer size
2720          */
2721         rbuf_fill_level = ((unsigned int)enable) >> 16;
2722         if (rbuf_fill_level) {
2723                 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2724                         spin_unlock_irqrestore(&info->lock, flags);
2725                         return -EINVAL;
2726                 }
2727                 info->rbuf_fill_level = rbuf_fill_level;
2728                 if (rbuf_fill_level < 128)
2729                         info->rx_pio = 1; /* PIO mode */
2730                 else
2731                         info->rx_pio = 0; /* DMA mode */
2732                 rx_stop(info); /* restart receiver to use new fill level */
2733         }
2734
2735         /*
2736          * enable[1..0] = receiver enable command
2737          * 0 = disable
2738          * 1 = enable
2739          * 2 = enable or force hunt mode if already enabled
2740          */
2741         enable &= 3;
2742         if (enable) {
2743                 if (!info->rx_enabled)
2744                         rx_start(info);
2745                 else if (enable == 2) {
2746                         /* force hunt mode (write 1 to RCR[3]) */
2747                         wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2748                 }
2749         } else {
2750                 if (info->rx_enabled)
2751                         rx_stop(info);
2752         }
2753         spin_unlock_irqrestore(&info->lock,flags);
2754         return 0;
2755 }
2756
2757 /*
2758  *  wait for specified event to occur
2759  */
2760 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2761 {
2762         unsigned long flags;
2763         int s;
2764         int rc=0;
2765         struct mgsl_icount cprev, cnow;
2766         int events;
2767         int mask;
2768         struct  _input_signal_events oldsigs, newsigs;
2769         DECLARE_WAITQUEUE(wait, current);
2770
2771         if (get_user(mask, mask_ptr))
2772                 return -EFAULT;
2773
2774         DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2775
2776         spin_lock_irqsave(&info->lock,flags);
2777
2778         /* return immediately if state matches requested events */
2779         get_signals(info);
2780         s = info->signals;
2781
2782         events = mask &
2783                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2784                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2785                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2786                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2787         if (events) {
2788                 spin_unlock_irqrestore(&info->lock,flags);
2789                 goto exit;
2790         }
2791
2792         /* save current irq counts */
2793         cprev = info->icount;
2794         oldsigs = info->input_signal_events;
2795
2796         /* enable hunt and idle irqs if needed */
2797         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2798                 unsigned short val = rd_reg16(info, SCR);
2799                 if (!(val & IRQ_RXIDLE))
2800                         wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2801         }
2802
2803         set_current_state(TASK_INTERRUPTIBLE);
2804         add_wait_queue(&info->event_wait_q, &wait);
2805
2806         spin_unlock_irqrestore(&info->lock,flags);
2807
2808         for(;;) {
2809                 schedule();
2810                 if (signal_pending(current)) {
2811                         rc = -ERESTARTSYS;
2812                         break;
2813                 }
2814
2815                 /* get current irq counts */
2816                 spin_lock_irqsave(&info->lock,flags);
2817                 cnow = info->icount;
2818                 newsigs = info->input_signal_events;
2819                 set_current_state(TASK_INTERRUPTIBLE);
2820                 spin_unlock_irqrestore(&info->lock,flags);
2821
2822                 /* if no change, wait aborted for some reason */
2823                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2824                     newsigs.dsr_down == oldsigs.dsr_down &&
2825                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2826                     newsigs.dcd_down == oldsigs.dcd_down &&
2827                     newsigs.cts_up   == oldsigs.cts_up   &&
2828                     newsigs.cts_down == oldsigs.cts_down &&
2829                     newsigs.ri_up    == oldsigs.ri_up    &&
2830                     newsigs.ri_down  == oldsigs.ri_down  &&
2831                     cnow.exithunt    == cprev.exithunt   &&
2832                     cnow.rxidle      == cprev.rxidle) {
2833                         rc = -EIO;
2834                         break;
2835                 }
2836
2837                 events = mask &
2838                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2839                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2840                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2841                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2842                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2843                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2844                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2845                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2846                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2847                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2848                 if (events)
2849                         break;
2850
2851                 cprev = cnow;
2852                 oldsigs = newsigs;
2853         }
2854
2855         remove_wait_queue(&info->event_wait_q, &wait);
2856         set_current_state(TASK_RUNNING);
2857
2858
2859         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2860                 spin_lock_irqsave(&info->lock,flags);
2861                 if (!waitqueue_active(&info->event_wait_q)) {
2862                         /* disable enable exit hunt mode/idle rcvd IRQs */
2863                         wr_reg16(info, SCR,
2864                                 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2865                 }
2866                 spin_unlock_irqrestore(&info->lock,flags);
2867         }
2868 exit:
2869         if (rc == 0)
2870                 rc = put_user(events, mask_ptr);
2871         return rc;
2872 }
2873
2874 static int get_interface(struct slgt_info *info, int __user *if_mode)
2875 {
2876         DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2877         if (put_user(info->if_mode, if_mode))
2878                 return -EFAULT;
2879         return 0;
2880 }
2881
2882 static int set_interface(struct slgt_info *info, int if_mode)
2883 {
2884         unsigned long flags;
2885         unsigned short val;
2886
2887         DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2888         spin_lock_irqsave(&info->lock,flags);
2889         info->if_mode = if_mode;
2890
2891         msc_set_vcr(info);
2892
2893         /* TCR (tx control) 07  1=RTS driver control */
2894         val = rd_reg16(info, TCR);
2895         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2896                 val |= BIT7;
2897         else
2898                 val &= ~BIT7;
2899         wr_reg16(info, TCR, val);
2900
2901         spin_unlock_irqrestore(&info->lock,flags);
2902         return 0;
2903 }
2904
2905 static int get_xsync(struct slgt_info *info, int __user *xsync)
2906 {
2907         DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2908         if (put_user(info->xsync, xsync))
2909                 return -EFAULT;
2910         return 0;
2911 }
2912
2913 /*
2914  * set extended sync pattern (1 to 4 bytes) for extended sync mode
2915  *
2916  * sync pattern is contained in least significant bytes of value
2917  * most significant byte of sync pattern is oldest (1st sent/detected)
2918  */
2919 static int set_xsync(struct slgt_info *info, int xsync)
2920 {
2921         unsigned long flags;
2922
2923         DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2924         spin_lock_irqsave(&info->lock, flags);
2925         info->xsync = xsync;
2926         wr_reg32(info, XSR, xsync);
2927         spin_unlock_irqrestore(&info->lock, flags);
2928         return 0;
2929 }
2930
2931 static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2932 {
2933         DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2934         if (put_user(info->xctrl, xctrl))
2935                 return -EFAULT;
2936         return 0;
2937 }
2938
2939 /*
2940  * set extended control options
2941  *
2942  * xctrl[31:19] reserved, must be zero
2943  * xctrl[18:17] extended sync pattern length in bytes
2944  *              00 = 1 byte  in xsr[7:0]
2945  *              01 = 2 bytes in xsr[15:0]
2946  *              10 = 3 bytes in xsr[23:0]
2947  *              11 = 4 bytes in xsr[31:0]
2948  * xctrl[16]    1 = enable terminal count, 0=disabled
2949  * xctrl[15:0]  receive terminal count for fixed length packets
2950  *              value is count minus one (0 = 1 byte packet)
2951  *              when terminal count is reached, receiver
2952  *              automatically returns to hunt mode and receive
2953  *              FIFO contents are flushed to DMA buffers with
2954  *              end of frame (EOF) status
2955  */
2956 static int set_xctrl(struct slgt_info *info, int xctrl)
2957 {
2958         unsigned long flags;
2959
2960         DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2961         spin_lock_irqsave(&info->lock, flags);
2962         info->xctrl = xctrl;
2963         wr_reg32(info, XCR, xctrl);
2964         spin_unlock_irqrestore(&info->lock, flags);
2965         return 0;
2966 }
2967
2968 /*
2969  * set general purpose IO pin state and direction
2970  *
2971  * user_gpio fields:
2972  * state   each bit indicates a pin state
2973  * smask   set bit indicates pin state to set
2974  * dir     each bit indicates a pin direction (0=input, 1=output)
2975  * dmask   set bit indicates pin direction to set
2976  */
2977 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2978 {
2979         unsigned long flags;
2980         struct gpio_desc gpio;
2981         __u32 data;
2982
2983         if (!info->gpio_present)
2984                 return -EINVAL;
2985         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2986                 return -EFAULT;
2987         DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2988                  info->device_name, gpio.state, gpio.smask,
2989                  gpio.dir, gpio.dmask));
2990
2991         spin_lock_irqsave(&info->port_array[0]->lock, flags);
2992         if (gpio.dmask) {
2993                 data = rd_reg32(info, IODR);
2994                 data |= gpio.dmask & gpio.dir;
2995                 data &= ~(gpio.dmask & ~gpio.dir);
2996                 wr_reg32(info, IODR, data);
2997         }
2998         if (gpio.smask) {
2999                 data = rd_reg32(info, IOVR);
3000                 data |= gpio.smask & gpio.state;
3001                 data &= ~(gpio.smask & ~gpio.state);
3002                 wr_reg32(info, IOVR, data);
3003         }
3004         spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3005
3006         return 0;
3007 }
3008
3009 /*
3010  * get general purpose IO pin state and direction
3011  */
3012 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3013 {
3014         struct gpio_desc gpio;
3015         if (!info->gpio_present)
3016                 return -EINVAL;
3017         gpio.state = rd_reg32(info, IOVR);
3018         gpio.smask = 0xffffffff;
3019         gpio.dir   = rd_reg32(info, IODR);
3020         gpio.dmask = 0xffffffff;
3021         if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3022                 return -EFAULT;
3023         DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
3024                  info->device_name, gpio.state, gpio.dir));
3025         return 0;
3026 }
3027
3028 /*
3029  * conditional wait facility
3030  */
3031 static void init_cond_wait(struct cond_wait *w, unsigned int data)
3032 {
3033         init_waitqueue_head(&w->q);
3034         init_waitqueue_entry(&w->wait, current);
3035         w->data = data;
3036 }
3037
3038 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
3039 {
3040         set_current_state(TASK_INTERRUPTIBLE);
3041         add_wait_queue(&w->q, &w->wait);
3042         w->next = *head;
3043         *head = w;
3044 }
3045
3046 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
3047 {
3048         struct cond_wait *w, *prev;
3049         remove_wait_queue(&cw->q, &cw->wait);
3050         set_current_state(TASK_RUNNING);
3051         for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
3052                 if (w == cw) {
3053                         if (prev != NULL)
3054                                 prev->next = w->next;
3055                         else
3056                                 *head = w->next;
3057                         break;
3058                 }
3059         }
3060 }
3061
3062 static void flush_cond_wait(struct cond_wait **head)
3063 {
3064         while (*head != NULL) {
3065                 wake_up_interruptible(&(*head)->q);
3066                 *head = (*head)->next;
3067         }
3068 }
3069
3070 /*
3071  * wait for general purpose I/O pin(s) to enter specified state
3072  *
3073  * user_gpio fields:
3074  * state - bit indicates target pin state
3075  * smask - set bit indicates watched pin
3076  *
3077  * The wait ends when at least one watched pin enters the specified
3078  * state. When 0 (no error) is returned, user_gpio->state is set to the
3079  * state of all GPIO pins when the wait ends.
3080  *
3081  * Note: Each pin may be a dedicated input, dedicated output, or
3082  * configurable input/output. The number and configuration of pins
3083  * varies with the specific adapter model. Only input pins (dedicated
3084  * or configured) can be monitored with this function.
3085  */
3086 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3087 {
3088         unsigned long flags;
3089         int rc = 0;
3090         struct gpio_desc gpio;
3091         struct cond_wait wait;
3092         u32 state;
3093
3094         if (!info->gpio_present)
3095                 return -EINVAL;
3096         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
3097                 return -EFAULT;
3098         DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
3099                  info->device_name, gpio.state, gpio.smask));
3100         /* ignore output pins identified by set IODR bit */
3101         if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3102                 return -EINVAL;
3103         init_cond_wait(&wait, gpio.smask);
3104
3105         spin_lock_irqsave(&info->port_array[0]->lock, flags);
3106         /* enable interrupts for watched pins */
3107         wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3108         /* get current pin states */
3109         state = rd_reg32(info, IOVR);
3110
3111         if (gpio.smask & ~(state ^ gpio.state)) {
3112                 /* already in target state */
3113                 gpio.state = state;
3114         } else {
3115                 /* wait for target state */
3116                 add_cond_wait(&info->gpio_wait_q, &wait);
3117                 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3118                 schedule();
3119                 if (signal_pending(current))
3120                         rc = -ERESTARTSYS;
3121                 else
3122                         gpio.state = wait.data;
3123                 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3124                 remove_cond_wait(&info->gpio_wait_q, &wait);
3125         }
3126
3127         /* disable all GPIO interrupts if no waiting processes */
3128         if (info->gpio_wait_q == NULL)
3129                 wr_reg32(info, IOER, 0);
3130         spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3131
3132         if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3133                 rc = -EFAULT;
3134         return rc;
3135 }
3136
3137 static int modem_input_wait(struct slgt_info *info,int arg)
3138 {
3139         unsigned long flags;
3140         int rc;
3141         struct mgsl_icount cprev, cnow;
3142         DECLARE_WAITQUEUE(wait, current);
3143
3144         /* save current irq counts */
3145         spin_lock_irqsave(&info->lock,flags);
3146         cprev = info->icount;
3147         add_wait_queue(&info->status_event_wait_q, &wait);
3148         set_current_state(TASK_INTERRUPTIBLE);
3149         spin_unlock_irqrestore(&info->lock,flags);
3150
3151         for(;;) {
3152                 schedule();
3153                 if (signal_pending(current)) {
3154                         rc = -ERESTARTSYS;
3155                         break;
3156                 }
3157
3158                 /* get new irq counts */
3159                 spin_lock_irqsave(&info->lock,flags);
3160                 cnow = info->icount;
3161                 set_current_state(TASK_INTERRUPTIBLE);
3162                 spin_unlock_irqrestore(&info->lock,flags);
3163
3164                 /* if no change, wait aborted for some reason */
3165                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3166                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3167                         rc = -EIO;
3168                         break;
3169                 }
3170
3171                 /* check for change in caller specified modem input */
3172                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3173                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3174                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3175                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3176                         rc = 0;
3177                         break;
3178                 }
3179
3180                 cprev = cnow;
3181         }
3182         remove_wait_queue(&info->status_event_wait_q, &wait);
3183         set_current_state(TASK_RUNNING);
3184         return rc;
3185 }
3186
3187 /*
3188  *  return state of serial control and status signals
3189  */
3190 static int tiocmget(struct tty_struct *tty)
3191 {
3192         struct slgt_info *info = tty->driver_data;
3193         unsigned int result;
3194         unsigned long flags;
3195
3196         spin_lock_irqsave(&info->lock,flags);
3197         get_signals(info);
3198         spin_unlock_irqrestore(&info->lock,flags);
3199
3200         result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3201                 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3202                 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3203                 ((info->signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3204                 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3205                 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3206
3207         DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3208         return result;
3209 }
3210
3211 /*
3212  * set modem control signals (DTR/RTS)
3213  *
3214  *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3215  *              TIOCMSET = set/clear signal values
3216  *      value   bit mask for command
3217  */
3218 static int tiocmset(struct tty_struct *tty,
3219                     unsigned int set, unsigned int clear)
3220 {
3221         struct slgt_info *info = tty->driver_data;
3222         unsigned long flags;
3223
3224         DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3225
3226         if (set & TIOCM_RTS)
3227                 info->signals |= SerialSignal_RTS;
3228         if (set & TIOCM_DTR)
3229                 info->signals |= SerialSignal_DTR;
3230         if (clear & TIOCM_RTS)
3231                 info->signals &= ~SerialSignal_RTS;
3232         if (clear & TIOCM_DTR)
3233                 info->signals &= ~SerialSignal_DTR;
3234
3235         spin_lock_irqsave(&info->lock,flags);
3236         set_signals(info);
3237         spin_unlock_irqrestore(&info->lock,flags);
3238         return 0;
3239 }
3240
3241 static int carrier_raised(struct tty_port *port)
3242 {
3243         unsigned long flags;
3244         struct slgt_info *info = container_of(port, struct slgt_info, port);
3245
3246         spin_lock_irqsave(&info->lock,flags);
3247         get_signals(info);
3248         spin_unlock_irqrestore(&info->lock,flags);
3249         return (info->signals & SerialSignal_DCD) ? 1 : 0;
3250 }
3251
3252 static void dtr_rts(struct tty_port *port, int on)
3253 {
3254         unsigned long flags;
3255         struct slgt_info *info = container_of(port, struct slgt_info, port);
3256
3257         spin_lock_irqsave(&info->lock,flags);
3258         if (on)
3259                 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
3260         else
3261                 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3262         set_signals(info);
3263         spin_unlock_irqrestore(&info->lock,flags);
3264 }
3265
3266
3267 /*
3268  *  block current process until the device is ready to open
3269  */
3270 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3271                            struct slgt_info *info)
3272 {
3273         DECLARE_WAITQUEUE(wait, current);
3274         int             retval;
3275         bool            do_clocal = false;
3276         bool            extra_count = false;
3277         unsigned long   flags;
3278         int             cd;
3279         struct tty_port *port = &info->port;
3280
3281         DBGINFO(("%s block_til_ready\n", tty->driver->name));
3282
3283         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3284                 /* nonblock mode is set or port is not enabled */
3285                 port->flags |= ASYNC_NORMAL_ACTIVE;
3286                 return 0;
3287         }
3288
3289         if (tty->termios.c_cflag & CLOCAL)
3290                 do_clocal = true;
3291
3292         /* Wait for carrier detect and the line to become
3293          * free (i.e., not in use by the callout).  While we are in
3294          * this loop, port->count is dropped by one, so that
3295          * close() knows when to free things.  We restore it upon
3296          * exit, either normal or abnormal.
3297          */
3298
3299         retval = 0;
3300         add_wait_queue(&port->open_wait, &wait);
3301
3302         spin_lock_irqsave(&info->lock, flags);
3303         if (!tty_hung_up_p(filp)) {
3304                 extra_count = true;
3305                 port->count--;
3306         }
3307         spin_unlock_irqrestore(&info->lock, flags);
3308         port->blocked_open++;
3309
3310         while (1) {
3311                 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
3312                         tty_port_raise_dtr_rts(port);
3313
3314                 set_current_state(TASK_INTERRUPTIBLE);
3315
3316                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3317                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3318                                         -EAGAIN : -ERESTARTSYS;
3319                         break;
3320                 }
3321
3322                 cd = tty_port_carrier_raised(port);
3323
3324                 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
3325                         break;
3326
3327                 if (signal_pending(current)) {
3328                         retval = -ERESTARTSYS;
3329                         break;
3330                 }
3331
3332                 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3333                 tty_unlock(tty);
3334                 schedule();
3335                 tty_lock(tty);
3336         }
3337
3338         set_current_state(TASK_RUNNING);
3339         remove_wait_queue(&port->open_wait, &wait);
3340
3341         if (extra_count)
3342                 port->count++;
3343         port->blocked_open--;
3344
3345         if (!retval)
3346                 port->flags |= ASYNC_NORMAL_ACTIVE;
3347
3348         DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3349         return retval;
3350 }
3351
3352 /*
3353  * allocate buffers used for calling line discipline receive_buf
3354  * directly in synchronous mode
3355  * note: add 5 bytes to max frame size to allow appending
3356  * 32-bit CRC and status byte when configured to do so
3357  */
3358 static int alloc_tmp_rbuf(struct slgt_info *info)
3359 {
3360         info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3361         if (info->tmp_rbuf == NULL)
3362                 return -ENOMEM;
3363         /* unused flag buffer to satisfy receive_buf calling interface */
3364         info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL);
3365         if (!info->flag_buf) {
3366                 kfree(info->tmp_rbuf);
3367                 info->tmp_rbuf = NULL;
3368                 return -ENOMEM;
3369         }
3370         return 0;
3371 }
3372
3373 static void free_tmp_rbuf(struct slgt_info *info)
3374 {
3375         kfree(info->tmp_rbuf);
3376         info->tmp_rbuf = NULL;
3377         kfree(info->flag_buf);
3378         info->flag_buf = NULL;
3379 }
3380
3381 /*
3382  * allocate DMA descriptor lists.
3383  */
3384 static int alloc_desc(struct slgt_info *info)
3385 {
3386         unsigned int i;
3387         unsigned int pbufs;
3388
3389         /* allocate memory to hold descriptor lists */
3390         info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3391         if (info->bufs == NULL)
3392                 return -ENOMEM;
3393
3394         memset(info->bufs, 0, DESC_LIST_SIZE);
3395
3396         info->rbufs = (struct slgt_desc*)info->bufs;
3397         info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3398
3399         pbufs = (unsigned int)info->bufs_dma_addr;
3400
3401         /*
3402          * Build circular lists of descriptors
3403          */
3404
3405         for (i=0; i < info->rbuf_count; i++) {
3406                 /* physical address of this descriptor */
3407                 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3408
3409                 /* physical address of next descriptor */
3410                 if (i == info->rbuf_count - 1)
3411                         info->rbufs[i].next = cpu_to_le32(pbufs);
3412                 else
3413                         info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3414                 set_desc_count(info->rbufs[i], DMABUFSIZE);
3415         }
3416
3417         for (i=0; i < info->tbuf_count; i++) {
3418                 /* physical address of this descriptor */
3419                 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3420
3421                 /* physical address of next descriptor */
3422                 if (i == info->tbuf_count - 1)
3423                         info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3424                 else
3425                         info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3426         }
3427
3428         return 0;
3429 }
3430
3431 static void free_desc(struct slgt_info *info)
3432 {
3433         if (info->bufs != NULL) {
3434                 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3435                 info->bufs  = NULL;
3436                 info->rbufs = NULL;
3437                 info->tbufs = NULL;
3438         }
3439 }
3440
3441 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3442 {
3443         int i;
3444         for (i=0; i < count; i++) {
3445                 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3446                         return -ENOMEM;
3447                 bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3448         }
3449         return 0;
3450 }
3451
3452 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3453 {
3454         int i;
3455         for (i=0; i < count; i++) {
3456                 if (bufs[i].buf == NULL)
3457                         continue;
3458                 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3459                 bufs[i].buf = NULL;
3460         }
3461 }
3462
3463 static int alloc_dma_bufs(struct slgt_info *info)
3464 {
3465         info->rbuf_count = 32;
3466         info->tbuf_count = 32;
3467
3468         if (alloc_desc(info) < 0 ||
3469             alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3470             alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3471             alloc_tmp_rbuf(info) < 0) {
3472                 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3473                 return -ENOMEM;
3474         }
3475         reset_rbufs(info);
3476         return 0;
3477 }
3478
3479 static void free_dma_bufs(struct slgt_info *info)
3480 {
3481         if (info->bufs) {
3482                 free_bufs(info, info->rbufs, info->rbuf_count);
3483                 free_bufs(info, info->tbufs, info->tbuf_count);
3484                 free_desc(info);
3485         }
3486         free_tmp_rbuf(info);
3487 }
3488
3489 static int claim_resources(struct slgt_info *info)
3490 {
3491         if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3492                 DBGERR(("%s reg addr conflict, addr=%08X\n",
3493                         info->device_name, info->phys_reg_addr));
3494                 info->init_error = DiagStatus_AddressConflict;
3495                 goto errout;
3496         }
3497         else
3498                 info->reg_addr_requested = true;
3499
3500         info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3501         if (!info->reg_addr) {
3502                 DBGERR(("%s can't map device registers, addr=%08X\n",
3503                         info->device_name, info->phys_reg_addr));
3504                 info->init_error = DiagStatus_CantAssignPciResources;
3505                 goto errout;
3506         }
3507         return 0;
3508
3509 errout:
3510         release_resources(info);
3511         return -ENODEV;
3512 }
3513
3514 static void release_resources(struct slgt_info *info)
3515 {
3516         if (info->irq_requested) {
3517                 free_irq(info->irq_level, info);
3518                 info->irq_requested = false;
3519         }
3520
3521         if (info->reg_addr_requested) {
3522                 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3523                 info->reg_addr_requested = false;
3524         }
3525
3526         if (info->reg_addr) {
3527                 iounmap(info->reg_addr);
3528                 info->reg_addr = NULL;
3529         }
3530 }
3531
3532 /* Add the specified device instance data structure to the
3533  * global linked list of devices and increment the device count.
3534  */
3535 static void add_device(struct slgt_info *info)
3536 {
3537         char *devstr;
3538
3539         info->next_device = NULL;
3540         info->line = slgt_device_count;
3541         sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3542
3543         if (info->line < MAX_DEVICES) {
3544                 if (maxframe[info->line])
3545                         info->max_frame_size = maxframe[info->line];
3546         }
3547
3548         slgt_device_count++;
3549
3550         if (!slgt_device_list)
3551                 slgt_device_list = info;
3552         else {
3553                 struct slgt_info *current_dev = slgt_device_list;
3554                 while(current_dev->next_device)
3555                         current_dev = current_dev->next_device;
3556                 current_dev->next_device = info;
3557         }
3558
3559         if (info->max_frame_size < 4096)
3560                 info->max_frame_size = 4096;
3561         else if (info->max_frame_size > 65535)
3562                 info->max_frame_size = 65535;
3563
3564         switch(info->pdev->device) {
3565         case SYNCLINK_GT_DEVICE_ID:
3566                 devstr = "GT";
3567                 break;
3568         case SYNCLINK_GT2_DEVICE_ID:
3569                 devstr = "GT2";
3570                 break;
3571         case SYNCLINK_GT4_DEVICE_ID:
3572                 devstr = "GT4";
3573                 break;
3574         case SYNCLINK_AC_DEVICE_ID:
3575                 devstr = "AC";
3576                 info->params.mode = MGSL_MODE_ASYNC;
3577                 break;
3578         default:
3579                 devstr = "(unknown model)";
3580         }
3581         printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3582                 devstr, info->device_name, info->phys_reg_addr,
3583                 info->irq_level, info->max_frame_size);
3584
3585 #if SYNCLINK_GENERIC_HDLC
3586         hdlcdev_init(info);
3587 #endif
3588 }
3589
3590 static const struct tty_port_operations slgt_port_ops = {
3591         .carrier_raised = carrier_raised,
3592         .dtr_rts = dtr_rts,
3593 };
3594
3595 /*
3596  *  allocate device instance structure, return NULL on failure
3597  */
3598 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3599 {
3600         struct slgt_info *info;
3601
3602         info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3603
3604         if (!info) {
3605                 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3606                         driver_name, adapter_num, port_num));
3607         } else {
3608                 tty_port_init(&info->port);
3609                 info->port.ops = &slgt_port_ops;
3610                 info->magic = MGSL_MAGIC;
3611                 INIT_WORK(&info->task, bh_handler);
3612                 info->max_frame_size = 4096;
3613                 info->base_clock = 14745600;
3614                 info->rbuf_fill_level = DMABUFSIZE;
3615                 info->port.close_delay = 5*HZ/10;
3616                 info->port.closing_wait = 30*HZ;
3617                 init_waitqueue_head(&info->status_event_wait_q);
3618                 init_waitqueue_head(&info->event_wait_q);
3619                 spin_lock_init(&info->netlock);
3620                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3621                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3622                 info->adapter_num = adapter_num;
3623                 info->port_num = port_num;
3624
3625                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3626                 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3627
3628                 /* Copy configuration info to device instance data */
3629                 info->pdev = pdev;
3630                 info->irq_level = pdev->irq;
3631                 info->phys_reg_addr = pci_resource_start(pdev,0);
3632
3633                 info->bus_type = MGSL_BUS_TYPE_PCI;
3634                 info->irq_flags = IRQF_SHARED;
3635
3636                 info->init_error = -1; /* assume error, set to 0 on successful init */
3637         }
3638
3639         return info;
3640 }
3641
3642 static void device_init(int adapter_num, struct pci_dev *pdev)
3643 {
3644         struct slgt_info *port_array[SLGT_MAX_PORTS];
3645         int i;
3646         int port_count = 1;
3647
3648         if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3649                 port_count = 2;
3650         else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3651                 port_count = 4;
3652
3653         /* allocate device instances for all ports */
3654         for (i=0; i < port_count; ++i) {
3655                 port_array[i] = alloc_dev(adapter_num, i, pdev);
3656                 if (port_array[i] == NULL) {
3657                         for (--i; i >= 0; --i) {
3658                                 tty_port_destroy(&port_array[i]->port);
3659                                 kfree(port_array[i]);
3660                         }
3661                         return;
3662                 }
3663         }
3664
3665         /* give copy of port_array to all ports and add to device list  */
3666         for (i=0; i < port_count; ++i) {
3667                 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3668                 add_device(port_array[i]);
3669                 port_array[i]->port_count = port_count;
3670                 spin_lock_init(&port_array[i]->lock);
3671         }
3672
3673         /* Allocate and claim adapter resources */
3674         if (!claim_resources(port_array[0])) {
3675
3676                 alloc_dma_bufs(port_array[0]);
3677
3678                 /* copy resource information from first port to others */
3679                 for (i = 1; i < port_count; ++i) {
3680                         port_array[i]->irq_level = port_array[0]->irq_level;
3681                         port_array[i]->reg_addr  = port_array[0]->reg_addr;
3682                         alloc_dma_bufs(port_array[i]);
3683                 }
3684
3685                 if (request_irq(port_array[0]->irq_level,
3686                                         slgt_interrupt,
3687                                         port_array[0]->irq_flags,
3688                                         port_array[0]->device_name,
3689                                         port_array[0]) < 0) {
3690                         DBGERR(("%s request_irq failed IRQ=%d\n",
3691                                 port_array[0]->device_name,
3692                                 port_array[0]->irq_level));
3693                 } else {
3694                         port_array[0]->irq_requested = true;
3695                         adapter_test(port_array[0]);
3696                         for (i=1 ; i < port_count ; i++) {
3697                                 port_array[i]->init_error = port_array[0]->init_error;
3698                                 port_array[i]->gpio_present = port_array[0]->gpio_present;
3699                         }
3700                 }
3701         }
3702
3703         for (i = 0; i < port_count; ++i) {
3704                 struct slgt_info *info = port_array[i];
3705                 tty_port_register_device(&info->port, serial_driver, info->line,
3706                                 &info->pdev->dev);
3707         }
3708 }
3709
3710 static int init_one(struct pci_dev *dev,
3711                               const struct pci_device_id *ent)
3712 {
3713         if (pci_enable_device(dev)) {
3714                 printk("error enabling pci device %p\n", dev);
3715                 return -EIO;
3716         }
3717         pci_set_master(dev);
3718         device_init(slgt_device_count, dev);
3719         return 0;
3720 }
3721
3722 static void remove_one(struct pci_dev *dev)
3723 {
3724 }
3725
3726 static const struct tty_operations ops = {
3727         .open = open,
3728         .close = close,
3729         .write = write,
3730         .put_char = put_char,
3731         .flush_chars = flush_chars,
3732         .write_room = write_room,
3733         .chars_in_buffer = chars_in_buffer,
3734         .flush_buffer = flush_buffer,
3735         .ioctl = ioctl,
3736         .compat_ioctl = slgt_compat_ioctl,
3737         .throttle = throttle,
3738         .unthrottle = unthrottle,
3739         .send_xchar = send_xchar,
3740         .break_ctl = set_break,
3741         .wait_until_sent = wait_until_sent,
3742         .set_termios = set_termios,
3743         .stop = tx_hold,
3744         .start = tx_release,
3745         .hangup = hangup,
3746         .tiocmget = tiocmget,
3747         .tiocmset = tiocmset,
3748         .get_icount = get_icount,
3749         .proc_fops = &synclink_gt_proc_fops,
3750 };
3751
3752 static void slgt_cleanup(void)
3753 {
3754         int rc;
3755         struct slgt_info *info;
3756         struct slgt_info *tmp;
3757
3758         printk(KERN_INFO "unload %s\n", driver_name);
3759
3760         if (serial_driver) {
3761                 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3762                         tty_unregister_device(serial_driver, info->line);
3763                 if ((rc = tty_unregister_driver(serial_driver)))
3764                         DBGERR(("tty_unregister_driver error=%d\n", rc));
3765                 put_tty_driver(serial_driver);
3766         }
3767
3768         /* reset devices */
3769         info = slgt_device_list;
3770         while(info) {
3771                 reset_port(info);
3772                 info = info->next_device;
3773         }
3774
3775         /* release devices */
3776         info = slgt_device_list;
3777         while(info) {
3778 #if SYNCLINK_GENERIC_HDLC
3779                 hdlcdev_exit(info);
3780 #endif
3781                 free_dma_bufs(info);
3782                 free_tmp_rbuf(info);
3783                 if (info->port_num == 0)
3784                         release_resources(info);
3785                 tmp = info;
3786                 info = info->next_device;
3787                 tty_port_destroy(&tmp->port);
3788                 kfree(tmp);
3789         }
3790
3791         if (pci_registered)
3792                 pci_unregister_driver(&pci_driver);
3793 }
3794
3795 /*
3796  *  Driver initialization entry point.
3797  */
3798 static int __init slgt_init(void)
3799 {
3800         int rc;
3801
3802         printk(KERN_INFO "%s\n", driver_name);
3803
3804         serial_driver = alloc_tty_driver(MAX_DEVICES);
3805         if (!serial_driver) {
3806                 printk("%s can't allocate tty driver\n", driver_name);
3807                 return -ENOMEM;
3808         }
3809
3810         /* Initialize the tty_driver structure */
3811
3812         serial_driver->driver_name = tty_driver_name;
3813         serial_driver->name = tty_dev_prefix;
3814         serial_driver->major = ttymajor;
3815         serial_driver->minor_start = 64;
3816         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3817         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3818         serial_driver->init_termios = tty_std_termios;
3819         serial_driver->init_termios.c_cflag =
3820                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3821         serial_driver->init_termios.c_ispeed = 9600;
3822         serial_driver->init_termios.c_ospeed = 9600;
3823         serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3824         tty_set_operations(serial_driver, &ops);
3825         if ((rc = tty_register_driver(serial_driver)) < 0) {
3826                 DBGERR(("%s can't register serial driver\n", driver_name));
3827                 put_tty_driver(serial_driver);
3828                 serial_driver = NULL;
3829                 goto error;
3830         }
3831
3832         printk(KERN_INFO "%s, tty major#%d\n",
3833                driver_name, serial_driver->major);
3834
3835         slgt_device_count = 0;
3836         if ((rc = pci_register_driver(&pci_driver)) < 0) {
3837                 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3838                 goto error;
3839         }
3840         pci_registered = true;
3841
3842         if (!slgt_device_list)
3843                 printk("%s no devices found\n",driver_name);
3844
3845         return 0;
3846
3847 error:
3848         slgt_cleanup();
3849         return rc;
3850 }
3851
3852 static void __exit slgt_exit(void)
3853 {
3854         slgt_cleanup();
3855 }
3856
3857 module_init(slgt_init);
3858 module_exit(slgt_exit);
3859
3860 /*
3861  * register access routines
3862  */
3863
3864 #define CALC_REGADDR() \
3865         unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3866         if (addr >= 0x80) \
3867                 reg_addr += (info->port_num) * 32; \
3868         else if (addr >= 0x40)  \
3869                 reg_addr += (info->port_num) * 16;
3870
3871 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3872 {
3873         CALC_REGADDR();
3874         return readb((void __iomem *)reg_addr);
3875 }
3876
3877 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3878 {
3879         CALC_REGADDR();
3880         writeb(value, (void __iomem *)reg_addr);
3881 }
3882
3883 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3884 {
3885         CALC_REGADDR();
3886         return readw((void __iomem *)reg_addr);
3887 }
3888
3889 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3890 {
3891         CALC_REGADDR();
3892         writew(value, (void __iomem *)reg_addr);
3893 }
3894
3895 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3896 {
3897         CALC_REGADDR();
3898         return readl((void __iomem *)reg_addr);
3899 }
3900
3901 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3902 {
3903         CALC_REGADDR();
3904         writel(value, (void __iomem *)reg_addr);
3905 }
3906
3907 static void rdma_reset(struct slgt_info *info)
3908 {
3909         unsigned int i;
3910
3911         /* set reset bit */
3912         wr_reg32(info, RDCSR, BIT1);
3913
3914         /* wait for enable bit cleared */
3915         for(i=0 ; i < 1000 ; i++)
3916                 if (!(rd_reg32(info, RDCSR) & BIT0))
3917                         break;
3918 }
3919
3920 static void tdma_reset(struct slgt_info *info)
3921 {
3922         unsigned int i;
3923
3924         /* set reset bit */
3925         wr_reg32(info, TDCSR, BIT1);
3926
3927         /* wait for enable bit cleared */
3928         for(i=0 ; i < 1000 ; i++)
3929                 if (!(rd_reg32(info, TDCSR) & BIT0))
3930                         break;
3931 }
3932
3933 /*
3934  * enable internal loopback
3935  * TxCLK and RxCLK are generated from BRG
3936  * and TxD is looped back to RxD internally.
3937  */
3938 static void enable_loopback(struct slgt_info *info)
3939 {
3940         /* SCR (serial control) BIT2=loopback enable */
3941         wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3942
3943         if (info->params.mode != MGSL_MODE_ASYNC) {
3944                 /* CCR (clock control)
3945                  * 07..05  tx clock source (010 = BRG)
3946                  * 04..02  rx clock source (010 = BRG)
3947                  * 01      auxclk enable   (0 = disable)
3948                  * 00      BRG enable      (1 = enable)
3949                  *
3950                  * 0100 1001
3951                  */
3952                 wr_reg8(info, CCR, 0x49);
3953
3954                 /* set speed if available, otherwise use default */
3955                 if (info->params.clock_speed)
3956                         set_rate(info, info->params.clock_speed);
3957                 else
3958                         set_rate(info, 3686400);
3959         }
3960 }
3961
3962 /*
3963  *  set baud rate generator to specified rate
3964  */
3965 static void set_rate(struct slgt_info *info, u32 rate)
3966 {
3967         unsigned int div;
3968         unsigned int osc = info->base_clock;
3969
3970         /* div = osc/rate - 1
3971          *
3972          * Round div up if osc/rate is not integer to
3973          * force to next slowest rate.
3974          */
3975
3976         if (rate) {
3977                 div = osc/rate;
3978                 if (!(osc % rate) && div)
3979                         div--;
3980                 wr_reg16(info, BDR, (unsigned short)div);
3981         }
3982 }
3983
3984 static void rx_stop(struct slgt_info *info)
3985 {
3986         unsigned short val;
3987
3988         /* disable and reset receiver */
3989         val = rd_reg16(info, RCR) & ~BIT1;          /* clear enable bit */
3990         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3991         wr_reg16(info, RCR, val);                  /* clear reset bit */
3992
3993         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3994
3995         /* clear pending rx interrupts */
3996         wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3997
3998         rdma_reset(info);
3999
4000         info->rx_enabled = false;
4001         info->rx_restart = false;
4002 }
4003
4004 static void rx_start(struct slgt_info *info)
4005 {
4006         unsigned short val;
4007
4008         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
4009
4010         /* clear pending rx overrun IRQ */
4011         wr_reg16(info, SSR, IRQ_RXOVER);
4012
4013         /* reset and disable receiver */
4014         val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
4015         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
4016         wr_reg16(info, RCR, val);                  /* clear reset bit */
4017
4018         rdma_reset(info);
4019         reset_rbufs(info);
4020
4021         if (info->rx_pio) {
4022                 /* rx request when rx FIFO not empty */
4023                 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
4024                 slgt_irq_on(info, IRQ_RXDATA);
4025                 if (info->params.mode == MGSL_MODE_ASYNC) {
4026                         /* enable saving of rx status */
4027                         wr_reg32(info, RDCSR, BIT6);
4028                 }
4029         } else {
4030                 /* rx request when rx FIFO half full */
4031                 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
4032                 /* set 1st descriptor address */
4033                 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
4034
4035                 if (info->params.mode != MGSL_MODE_ASYNC) {
4036                         /* enable rx DMA and DMA interrupt */
4037                         wr_reg32(info, RDCSR, (BIT2 + BIT0));
4038                 } else {
4039                         /* enable saving of rx status, rx DMA and DMA interrupt */
4040                         wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
4041                 }
4042         }
4043
4044         slgt_irq_on(info, IRQ_RXOVER);
4045
4046         /* enable receiver */
4047         wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
4048
4049         info->rx_restart = false;
4050         info->rx_enabled = true;
4051 }
4052
4053 static void tx_start(struct slgt_info *info)
4054 {
4055         if (!info->tx_enabled) {
4056                 wr_reg16(info, TCR,
4057                          (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
4058                 info->tx_enabled = true;
4059         }
4060
4061         if (desc_count(info->tbufs[info->tbuf_start])) {
4062                 info->drop_rts_on_tx_done = false;
4063
4064                 if (info->params.mode != MGSL_MODE_ASYNC) {
4065                         if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
4066                                 get_signals(info);
4067                                 if (!(info->signals & SerialSignal_RTS)) {
4068                                         info->signals |= SerialSignal_RTS;
4069                                         set_signals(info);
4070                                         info->drop_rts_on_tx_done = true;
4071                                 }
4072                         }
4073
4074                         slgt_irq_off(info, IRQ_TXDATA);
4075                         slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
4076                         /* clear tx idle and underrun status bits */
4077                         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4078                 } else {
4079                         slgt_irq_off(info, IRQ_TXDATA);
4080                         slgt_irq_on(info, IRQ_TXIDLE);
4081                         /* clear tx idle status bit */
4082                         wr_reg16(info, SSR, IRQ_TXIDLE);
4083                 }
4084                 /* set 1st descriptor address and start DMA */
4085                 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
4086                 wr_reg32(info, TDCSR, BIT2 + BIT0);
4087                 info->tx_active = true;
4088         }
4089 }
4090
4091 static void tx_stop(struct slgt_info *info)
4092 {
4093         unsigned short val;
4094
4095         del_timer(&info->tx_timer);
4096
4097         tdma_reset(info);
4098
4099         /* reset and disable transmitter */
4100         val = rd_reg16(info, TCR) & ~BIT1;          /* clear enable bit */
4101         wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
4102
4103         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
4104
4105         /* clear tx idle and underrun status bit */
4106         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4107
4108         reset_tbufs(info);
4109
4110         info->tx_enabled = false;
4111         info->tx_active = false;
4112 }
4113
4114 static void reset_port(struct slgt_info *info)
4115 {
4116         if (!info->reg_addr)
4117                 return;
4118
4119         tx_stop(info);
4120         rx_stop(info);
4121
4122         info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4123         set_signals(info);
4124
4125         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4126 }
4127
4128 static void reset_adapter(struct slgt_info *info)
4129 {
4130         int i;
4131         for (i=0; i < info->port_count; ++i) {
4132                 if (info->port_array[i])
4133                         reset_port(info->port_array[i]);
4134         }
4135 }
4136
4137 static void async_mode(struct slgt_info *info)
4138 {
4139         unsigned short val;
4140
4141         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4142         tx_stop(info);
4143         rx_stop(info);
4144
4145         /* TCR (tx control)
4146          *
4147          * 15..13  mode, 010=async
4148          * 12..10  encoding, 000=NRZ
4149          * 09      parity enable
4150          * 08      1=odd parity, 0=even parity
4151          * 07      1=RTS driver control
4152          * 06      1=break enable
4153          * 05..04  character length
4154          *         00=5 bits
4155          *         01=6 bits
4156          *         10=7 bits
4157          *         11=8 bits
4158          * 03      0=1 stop bit, 1=2 stop bits
4159          * 02      reset
4160          * 01      enable
4161          * 00      auto-CTS enable
4162          */
4163         val = 0x4000;
4164
4165         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4166                 val |= BIT7;
4167
4168         if (info->params.parity != ASYNC_PARITY_NONE) {
4169                 val |= BIT9;
4170                 if (info->params.parity == ASYNC_PARITY_ODD)
4171                         val |= BIT8;
4172         }
4173
4174         switch (info->params.data_bits)
4175         {
4176         case 6: val |= BIT4; break;
4177         case 7: val |= BIT5; break;
4178         case 8: val |= BIT5 + BIT4; break;
4179         }
4180
4181         if (info->params.stop_bits != 1)
4182                 val |= BIT3;
4183
4184         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4185                 val |= BIT0;
4186
4187         wr_reg16(info, TCR, val);
4188
4189         /* RCR (rx control)
4190          *
4191          * 15..13  mode, 010=async
4192          * 12..10  encoding, 000=NRZ
4193          * 09      parity enable
4194          * 08      1=odd parity, 0=even parity
4195          * 07..06  reserved, must be 0
4196          * 05..04  character length
4197          *         00=5 bits
4198          *         01=6 bits
4199          *         10=7 bits
4200          *         11=8 bits
4201          * 03      reserved, must be zero
4202          * 02      reset
4203          * 01      enable
4204          * 00      auto-DCD enable
4205          */
4206         val = 0x4000;
4207
4208         if (info->params.parity != ASYNC_PARITY_NONE) {
4209                 val |= BIT9;
4210                 if (info->params.parity == ASYNC_PARITY_ODD)
4211                         val |= BIT8;
4212         }
4213
4214         switch (info->params.data_bits)
4215         {
4216         case 6: val |= BIT4; break;
4217         case 7: val |= BIT5; break;
4218         case 8: val |= BIT5 + BIT4; break;
4219         }
4220
4221         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4222                 val |= BIT0;
4223
4224         wr_reg16(info, RCR, val);
4225
4226         /* CCR (clock control)
4227          *
4228          * 07..05  011 = tx clock source is BRG/16
4229          * 04..02  010 = rx clock source is BRG
4230          * 01      0 = auxclk disabled
4231          * 00      1 = BRG enabled
4232          *
4233          * 0110 1001
4234          */
4235         wr_reg8(info, CCR, 0x69);
4236
4237         msc_set_vcr(info);
4238
4239         /* SCR (serial control)
4240          *
4241          * 15  1=tx req on FIFO half empty
4242          * 14  1=rx req on FIFO half full
4243          * 13  tx data  IRQ enable
4244          * 12  tx idle  IRQ enable
4245          * 11  rx break on IRQ enable
4246          * 10  rx data  IRQ enable
4247          * 09  rx break off IRQ enable
4248          * 08  overrun  IRQ enable
4249          * 07  DSR      IRQ enable
4250          * 06  CTS      IRQ enable
4251          * 05  DCD      IRQ enable
4252          * 04  RI       IRQ enable
4253          * 03  0=16x sampling, 1=8x sampling
4254          * 02  1=txd->rxd internal loopback enable
4255          * 01  reserved, must be zero
4256          * 00  1=master IRQ enable
4257          */
4258         val = BIT15 + BIT14 + BIT0;
4259         /* JCR[8] : 1 = x8 async mode feature available */
4260         if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4261             ((info->base_clock < (info->params.data_rate * 16)) ||
4262              (info->base_clock % (info->params.data_rate * 16)))) {
4263                 /* use 8x sampling */
4264                 val |= BIT3;
4265                 set_rate(info, info->params.data_rate * 8);
4266         } else {
4267                 /* use 16x sampling */
4268                 set_rate(info, info->params.data_rate * 16);
4269         }
4270         wr_reg16(info, SCR, val);
4271
4272         slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4273
4274         if (info->params.loopback)
4275                 enable_loopback(info);
4276 }
4277
4278 static void sync_mode(struct slgt_info *info)
4279 {
4280         unsigned short val;
4281
4282         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4283         tx_stop(info);
4284         rx_stop(info);
4285
4286         /* TCR (tx control)
4287          *
4288          * 15..13  mode
4289          *         000=HDLC/SDLC
4290          *         001=raw bit synchronous
4291          *         010=asynchronous/isochronous
4292          *         011=monosync byte synchronous
4293          *         100=bisync byte synchronous
4294          *         101=xsync byte synchronous
4295          * 12..10  encoding
4296          * 09      CRC enable
4297          * 08      CRC32
4298          * 07      1=RTS driver control
4299          * 06      preamble enable
4300          * 05..04  preamble length
4301          * 03      share open/close flag
4302          * 02      reset
4303          * 01      enable
4304          * 00      auto-CTS enable
4305          */
4306         val = BIT2;
4307
4308         switch(info->params.mode) {
4309         case MGSL_MODE_XSYNC:
4310                 val |= BIT15 + BIT13;
4311                 break;
4312         case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4313         case MGSL_MODE_BISYNC:   val |= BIT15; break;
4314         case MGSL_MODE_RAW:      val |= BIT13; break;
4315         }
4316         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4317                 val |= BIT7;
4318
4319         switch(info->params.encoding)
4320         {
4321         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4322         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4323         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4324         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4325         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4326         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4327         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4328         }
4329
4330         switch (info->params.crc_type & HDLC_CRC_MASK)
4331         {
4332         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4333         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4334         }
4335
4336         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4337                 val |= BIT6;
4338
4339         switch (info->params.preamble_length)
4340         {
4341         case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4342         case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4343         case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4344         }
4345
4346         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4347                 val |= BIT0;
4348
4349         wr_reg16(info, TCR, val);
4350
4351         /* TPR (transmit preamble) */
4352
4353         switch (info->params.preamble)
4354         {
4355         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4356         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
4357         case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4358         case HDLC_PREAMBLE_PATTERN_10:    val = 0x55; break;
4359         case HDLC_PREAMBLE_PATTERN_01:    val = 0xaa; break;
4360         default:                          val = 0x7e; break;
4361         }
4362         wr_reg8(info, TPR, (unsigned char)val);
4363
4364         /* RCR (rx control)
4365          *
4366          * 15..13  mode
4367          *         000=HDLC/SDLC
4368          *         001=raw bit synchronous
4369          *         010=asynchronous/isochronous
4370          *         011=monosync byte synchronous
4371          *         100=bisync byte synchronous
4372          *         101=xsync byte synchronous
4373          * 12..10  encoding
4374          * 09      CRC enable
4375          * 08      CRC32
4376          * 07..03  reserved, must be 0
4377          * 02      reset
4378          * 01      enable
4379          * 00      auto-DCD enable
4380          */
4381         val = 0;
4382
4383         switch(info->params.mode) {
4384         case MGSL_MODE_XSYNC:
4385                 val |= BIT15 + BIT13;
4386                 break;
4387         case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4388         case MGSL_MODE_BISYNC:   val |= BIT15; break;
4389         case MGSL_MODE_RAW:      val |= BIT13; break;
4390         }
4391
4392         switch(info->params.encoding)
4393         {
4394         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4395         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4396         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4397         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4398         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4399         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4400         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4401         }
4402
4403         switch (info->params.crc_type & HDLC_CRC_MASK)
4404         {
4405         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4406         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4407         }
4408
4409         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4410                 val |= BIT0;
4411
4412         wr_reg16(info, RCR, val);
4413
4414         /* CCR (clock control)
4415          *
4416          * 07..05  tx clock source
4417          * 04..02  rx clock source
4418          * 01      auxclk enable
4419          * 00      BRG enable
4420          */
4421         val = 0;
4422
4423         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4424         {
4425                 // when RxC source is DPLL, BRG generates 16X DPLL
4426                 // reference clock, so take TxC from BRG/16 to get
4427                 // transmit clock at actual data rate
4428                 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4429                         val |= BIT6 + BIT5;     /* 011, txclk = BRG/16 */
4430                 else
4431                         val |= BIT6;    /* 010, txclk = BRG */
4432         }
4433         else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4434                 val |= BIT7;    /* 100, txclk = DPLL Input */
4435         else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4436                 val |= BIT5;    /* 001, txclk = RXC Input */
4437
4438         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4439                 val |= BIT3;    /* 010, rxclk = BRG */
4440         else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4441                 val |= BIT4;    /* 100, rxclk = DPLL */
4442         else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4443                 val |= BIT2;    /* 001, rxclk = TXC Input */
4444
4445         if (info->params.clock_speed)
4446                 val |= BIT1 + BIT0;
4447
4448         wr_reg8(info, CCR, (unsigned char)val);
4449
4450         if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4451         {
4452                 // program DPLL mode
4453                 switch(info->params.encoding)
4454                 {
4455                 case HDLC_ENCODING_BIPHASE_MARK:
4456                 case HDLC_ENCODING_BIPHASE_SPACE:
4457                         val = BIT7; break;
4458                 case HDLC_ENCODING_BIPHASE_LEVEL:
4459                 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4460                         val = BIT7 + BIT6; break;
4461                 default: val = BIT6;    // NRZ encodings
4462                 }
4463                 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4464
4465                 // DPLL requires a 16X reference clock from BRG
4466                 set_rate(info, info->params.clock_speed * 16);
4467         }
4468         else
4469                 set_rate(info, info->params.clock_speed);
4470
4471         tx_set_idle(info);
4472
4473         msc_set_vcr(info);
4474
4475         /* SCR (serial control)
4476          *
4477          * 15  1=tx req on FIFO half empty
4478          * 14  1=rx req on FIFO half full
4479          * 13  tx data  IRQ enable
4480          * 12  tx idle  IRQ enable
4481          * 11  underrun IRQ enable
4482          * 10  rx data  IRQ enable
4483          * 09  rx idle  IRQ enable
4484          * 08  overrun  IRQ enable
4485          * 07  DSR      IRQ enable
4486          * 06  CTS      IRQ enable
4487          * 05  DCD      IRQ enable
4488          * 04  RI       IRQ enable
4489          * 03  reserved, must be zero
4490          * 02  1=txd->rxd internal loopback enable
4491          * 01  reserved, must be zero
4492          * 00  1=master IRQ enable
4493          */
4494         wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4495
4496         if (info->params.loopback)
4497                 enable_loopback(info);
4498 }
4499
4500 /*
4501  *  set transmit idle mode
4502  */
4503 static void tx_set_idle(struct slgt_info *info)
4504 {
4505         unsigned char val;
4506         unsigned short tcr;
4507
4508         /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4509          * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4510          */
4511         tcr = rd_reg16(info, TCR);
4512         if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4513                 /* disable preamble, set idle size to 16 bits */
4514                 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4515                 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4516                 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4517         } else if (!(tcr & BIT6)) {
4518                 /* preamble is disabled, set idle size to 8 bits */
4519                 tcr &= ~(BIT5 + BIT4);
4520         }
4521         wr_reg16(info, TCR, tcr);
4522
4523         if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4524                 /* LSB of custom tx idle specified in tx idle register */
4525                 val = (unsigned char)(info->idle_mode & 0xff);
4526         } else {
4527                 /* standard 8 bit idle patterns */
4528                 switch(info->idle_mode)
4529                 {
4530                 case HDLC_TXIDLE_FLAGS:          val = 0x7e; break;
4531                 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4532                 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4533                 case HDLC_TXIDLE_ZEROS:
4534                 case HDLC_TXIDLE_SPACE:          val = 0x00; break;
4535                 default:                         val = 0xff;
4536                 }
4537         }
4538
4539         wr_reg8(info, TIR, val);
4540 }
4541
4542 /*
4543  * get state of V24 status (input) signals
4544  */
4545 static void get_signals(struct slgt_info *info)
4546 {
4547         unsigned short status = rd_reg16(info, SSR);
4548
4549         /* clear all serial signals except RTS and DTR */
4550         info->signals &= SerialSignal_RTS | SerialSignal_DTR;
4551
4552         if (status & BIT3)
4553                 info->signals |= SerialSignal_DSR;
4554         if (status & BIT2)
4555                 info->signals |= SerialSignal_CTS;
4556         if (status & BIT1)
4557                 info->signals |= SerialSignal_DCD;
4558         if (status & BIT0)
4559                 info->signals |= SerialSignal_RI;
4560 }
4561
4562 /*
4563  * set V.24 Control Register based on current configuration
4564  */
4565 static void msc_set_vcr(struct slgt_info *info)
4566 {
4567         unsigned char val = 0;
4568
4569         /* VCR (V.24 control)
4570          *
4571          * 07..04  serial IF select
4572          * 03      DTR
4573          * 02      RTS
4574          * 01      LL
4575          * 00      RL
4576          */
4577
4578         switch(info->if_mode & MGSL_INTERFACE_MASK)
4579         {
4580         case MGSL_INTERFACE_RS232:
4581                 val |= BIT5; /* 0010 */
4582                 break;
4583         case MGSL_INTERFACE_V35:
4584                 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4585                 break;
4586         case MGSL_INTERFACE_RS422:
4587                 val |= BIT6; /* 0100 */
4588                 break;
4589         }
4590
4591         if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4592                 val |= BIT4;
4593         if (info->signals & SerialSignal_DTR)
4594                 val |= BIT3;
4595         if (info->signals & SerialSignal_RTS)
4596                 val |= BIT2;
4597         if (info->if_mode & MGSL_INTERFACE_LL)
4598                 val |= BIT1;
4599         if (info->if_mode & MGSL_INTERFACE_RL)
4600                 val |= BIT0;
4601         wr_reg8(info, VCR, val);
4602 }
4603
4604 /*
4605  * set state of V24 control (output) signals
4606  */
4607 static void set_signals(struct slgt_info *info)
4608 {
4609         unsigned char val = rd_reg8(info, VCR);
4610         if (info->signals & SerialSignal_DTR)
4611                 val |= BIT3;
4612         else
4613                 val &= ~BIT3;
4614         if (info->signals & SerialSignal_RTS)
4615                 val |= BIT2;
4616         else
4617                 val &= ~BIT2;
4618         wr_reg8(info, VCR, val);
4619 }
4620
4621 /*
4622  * free range of receive DMA buffers (i to last)
4623  */
4624 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4625 {
4626         int done = 0;
4627
4628         while(!done) {
4629                 /* reset current buffer for reuse */
4630                 info->rbufs[i].status = 0;
4631                 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4632                 if (i == last)
4633                         done = 1;
4634                 if (++i == info->rbuf_count)
4635                         i = 0;
4636         }
4637         info->rbuf_current = i;
4638 }
4639
4640 /*
4641  * mark all receive DMA buffers as free
4642  */
4643 static void reset_rbufs(struct slgt_info *info)
4644 {
4645         free_rbufs(info, 0, info->rbuf_count - 1);
4646         info->rbuf_fill_index = 0;
4647         info->rbuf_fill_count = 0;
4648 }
4649
4650 /*
4651  * pass receive HDLC frame to upper layer
4652  *
4653  * return true if frame available, otherwise false
4654  */
4655 static bool rx_get_frame(struct slgt_info *info)
4656 {
4657         unsigned int start, end;
4658         unsigned short status;
4659         unsigned int framesize = 0;
4660         unsigned long flags;
4661         struct tty_struct *tty = info->port.tty;
4662         unsigned char addr_field = 0xff;
4663         unsigned int crc_size = 0;
4664
4665         switch (info->params.crc_type & HDLC_CRC_MASK) {
4666         case HDLC_CRC_16_CCITT: crc_size = 2; break;
4667         case HDLC_CRC_32_CCITT: crc_size = 4; break;
4668         }
4669
4670 check_again:
4671
4672         framesize = 0;
4673         addr_field = 0xff;
4674         start = end = info->rbuf_current;
4675
4676         for (;;) {
4677                 if (!desc_complete(info->rbufs[end]))
4678                         goto cleanup;
4679
4680                 if (framesize == 0 && info->params.addr_filter != 0xff)
4681                         addr_field = info->rbufs[end].buf[0];
4682
4683                 framesize += desc_count(info->rbufs[end]);
4684
4685                 if (desc_eof(info->rbufs[end]))
4686                         break;
4687
4688                 if (++end == info->rbuf_count)
4689                         end = 0;
4690
4691                 if (end == info->rbuf_current) {
4692                         if (info->rx_enabled){
4693                                 spin_lock_irqsave(&info->lock,flags);
4694                                 rx_start(info);
4695                                 spin_unlock_irqrestore(&info->lock,flags);
4696                         }
4697                         goto cleanup;
4698                 }
4699         }
4700
4701         /* status
4702          *
4703          * 15      buffer complete
4704          * 14..06  reserved
4705          * 05..04  residue
4706          * 02      eof (end of frame)
4707          * 01      CRC error
4708          * 00      abort
4709          */
4710         status = desc_status(info->rbufs[end]);
4711
4712         /* ignore CRC bit if not using CRC (bit is undefined) */
4713         if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4714                 status &= ~BIT1;
4715
4716         if (framesize == 0 ||
4717                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4718                 free_rbufs(info, start, end);
4719                 goto check_again;
4720         }
4721
4722         if (framesize < (2 + crc_size) || status & BIT0) {
4723                 info->icount.rxshort++;
4724                 framesize = 0;
4725         } else if (status & BIT1) {
4726                 info->icount.rxcrc++;
4727                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4728                         framesize = 0;
4729         }
4730
4731 #if SYNCLINK_GENERIC_HDLC
4732         if (framesize == 0) {
4733                 info->netdev->stats.rx_errors++;
4734                 info->netdev->stats.rx_frame_errors++;
4735         }
4736 #endif
4737
4738         DBGBH(("%s rx frame status=%04X size=%d\n",
4739                 info->device_name, status, framesize));
4740         DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4741
4742         if (framesize) {
4743                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4744                         framesize -= crc_size;
4745                         crc_size = 0;
4746                 }
4747
4748                 if (framesize > info->max_frame_size + crc_size)
4749                         info->icount.rxlong++;
4750                 else {
4751                         /* copy dma buffer(s) to contiguous temp buffer */
4752                         int copy_count = framesize;
4753                         int i = start;
4754                         unsigned char *p = info->tmp_rbuf;
4755                         info->tmp_rbuf_count = framesize;
4756
4757                         info->icount.rxok++;
4758
4759                         while(copy_count) {
4760                                 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4761                                 memcpy(p, info->rbufs[i].buf, partial_count);
4762                                 p += partial_count;
4763                                 copy_count -= partial_count;
4764                                 if (++i == info->rbuf_count)
4765                                         i = 0;
4766                         }
4767
4768                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4769                                 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4770                                 framesize++;
4771                         }
4772
4773 #if SYNCLINK_GENERIC_HDLC
4774                         if (info->netcount)
4775                                 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4776                         else
4777 #endif
4778                                 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4779                 }
4780         }
4781         free_rbufs(info, start, end);
4782         return true;
4783
4784 cleanup:
4785         return false;
4786 }
4787
4788 /*
4789  * pass receive buffer (RAW synchronous mode) to tty layer
4790  * return true if buffer available, otherwise false
4791  */
4792 static bool rx_get_buf(struct slgt_info *info)
4793 {
4794         unsigned int i = info->rbuf_current;
4795         unsigned int count;
4796
4797         if (!desc_complete(info->rbufs[i]))
4798                 return false;
4799         count = desc_count(info->rbufs[i]);
4800         switch(info->params.mode) {
4801         case MGSL_MODE_MONOSYNC:
4802         case MGSL_MODE_BISYNC:
4803         case MGSL_MODE_XSYNC:
4804                 /* ignore residue in byte synchronous modes */
4805                 if (desc_residue(info->rbufs[i]))
4806                         count--;
4807                 break;
4808         }
4809         DBGDATA(info, info->rbufs[i].buf, count, "rx");
4810         DBGINFO(("rx_get_buf size=%d\n", count));
4811         if (count)
4812                 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4813                                   info->flag_buf, count);
4814         free_rbufs(info, i, i);
4815         return true;
4816 }
4817
4818 static void reset_tbufs(struct slgt_info *info)
4819 {
4820         unsigned int i;
4821         info->tbuf_current = 0;
4822         for (i=0 ; i < info->tbuf_count ; i++) {
4823                 info->tbufs[i].status = 0;
4824                 info->tbufs[i].count  = 0;
4825         }
4826 }
4827
4828 /*
4829  * return number of free transmit DMA buffers
4830  */
4831 static unsigned int free_tbuf_count(struct slgt_info *info)
4832 {
4833         unsigned int count = 0;
4834         unsigned int i = info->tbuf_current;
4835
4836         do
4837         {
4838                 if (desc_count(info->tbufs[i]))
4839                         break; /* buffer in use */
4840                 ++count;
4841                 if (++i == info->tbuf_count)
4842                         i=0;
4843         } while (i != info->tbuf_current);
4844
4845         /* if tx DMA active, last zero count buffer is in use */
4846         if (count && (rd_reg32(info, TDCSR) & BIT0))
4847                 --count;
4848
4849         return count;
4850 }
4851
4852 /*
4853  * return number of bytes in unsent transmit DMA buffers
4854  * and the serial controller tx FIFO
4855  */
4856 static unsigned int tbuf_bytes(struct slgt_info *info)
4857 {
4858         unsigned int total_count = 0;
4859         unsigned int i = info->tbuf_current;
4860         unsigned int reg_value;
4861         unsigned int count;
4862         unsigned int active_buf_count = 0;
4863
4864         /*
4865          * Add descriptor counts for all tx DMA buffers.
4866          * If count is zero (cleared by DMA controller after read),
4867          * the buffer is complete or is actively being read from.
4868          *
4869          * Record buf_count of last buffer with zero count starting
4870          * from current ring position. buf_count is mirror
4871          * copy of count and is not cleared by serial controller.
4872          * If DMA controller is active, that buffer is actively
4873          * being read so add to total.
4874          */
4875         do {
4876                 count = desc_count(info->tbufs[i]);
4877                 if (count)
4878                         total_count += count;
4879                 else if (!total_count)
4880                         active_buf_count = info->tbufs[i].buf_count;
4881                 if (++i == info->tbuf_count)
4882                         i = 0;
4883         } while (i != info->tbuf_current);
4884
4885         /* read tx DMA status register */
4886         reg_value = rd_reg32(info, TDCSR);
4887
4888         /* if tx DMA active, last zero count buffer is in use */
4889         if (reg_value & BIT0)
4890                 total_count += active_buf_count;
4891
4892         /* add tx FIFO count = reg_value[15..8] */
4893         total_count += (reg_value >> 8) & 0xff;
4894
4895         /* if transmitter active add one byte for shift register */
4896         if (info->tx_active)
4897                 total_count++;
4898
4899         return total_count;
4900 }
4901
4902 /*
4903  * load data into transmit DMA buffer ring and start transmitter if needed
4904  * return true if data accepted, otherwise false (buffers full)
4905  */
4906 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4907 {
4908         unsigned short count;
4909         unsigned int i;
4910         struct slgt_desc *d;
4911
4912         /* check required buffer space */
4913         if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4914                 return false;
4915
4916         DBGDATA(info, buf, size, "tx");
4917
4918         /*
4919          * copy data to one or more DMA buffers in circular ring
4920          * tbuf_start   = first buffer for this data
4921          * tbuf_current = next free buffer
4922          *
4923          * Copy all data before making data visible to DMA controller by
4924          * setting descriptor count of the first buffer.
4925          * This prevents an active DMA controller from reading the first DMA
4926          * buffers of a frame and stopping before the final buffers are filled.
4927          */
4928
4929         info->tbuf_start = i = info->tbuf_current;
4930
4931         while (size) {
4932                 d = &info->tbufs[i];
4933
4934                 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4935                 memcpy(d->buf, buf, count);
4936
4937                 size -= count;
4938                 buf  += count;
4939
4940                 /*
4941                  * set EOF bit for last buffer of HDLC frame or
4942                  * for every buffer in raw mode
4943                  */
4944                 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4945                     info->params.mode == MGSL_MODE_RAW)
4946                         set_desc_eof(*d, 1);
4947                 else
4948                         set_desc_eof(*d, 0);
4949
4950                 /* set descriptor count for all but first buffer */
4951                 if (i != info->tbuf_start)
4952                         set_desc_count(*d, count);
4953                 d->buf_count = count;
4954
4955                 if (++i == info->tbuf_count)
4956                         i = 0;
4957         }
4958
4959         info->tbuf_current = i;
4960
4961         /* set first buffer count to make new data visible to DMA controller */
4962         d = &info->tbufs[info->tbuf_start];
4963         set_desc_count(*d, d->buf_count);
4964
4965         /* start transmitter if needed and update transmit timeout */
4966         if (!info->tx_active)
4967                 tx_start(info);
4968         update_tx_timer(info);
4969
4970         return true;
4971 }
4972
4973 static int register_test(struct slgt_info *info)
4974 {
4975         static unsigned short patterns[] =
4976                 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4977         static unsigned int count = ARRAY_SIZE(patterns);
4978         unsigned int i;
4979         int rc = 0;
4980
4981         for (i=0 ; i < count ; i++) {
4982                 wr_reg16(info, TIR, patterns[i]);
4983                 wr_reg16(info, BDR, patterns[(i+1)%count]);
4984                 if ((rd_reg16(info, TIR) != patterns[i]) ||
4985                     (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4986                         rc = -ENODEV;
4987                         break;
4988                 }
4989         }
4990         info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4991         info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4992         return rc;
4993 }
4994
4995 static int irq_test(struct slgt_info *info)
4996 {
4997         unsigned long timeout;
4998         unsigned long flags;
4999         struct tty_struct *oldtty = info->port.tty;
5000         u32 speed = info->params.data_rate;
5001
5002         info->params.data_rate = 921600;
5003         info->port.tty = NULL;
5004
5005         spin_lock_irqsave(&info->lock, flags);
5006         async_mode(info);
5007         slgt_irq_on(info, IRQ_TXIDLE);
5008
5009         /* enable transmitter */
5010         wr_reg16(info, TCR,
5011                 (unsigned short)(rd_reg16(info, TCR) | BIT1));
5012
5013         /* write one byte and wait for tx idle */
5014         wr_reg16(info, TDR, 0);
5015
5016         /* assume failure */
5017         info->init_error = DiagStatus_IrqFailure;
5018         info->irq_occurred = false;
5019
5020         spin_unlock_irqrestore(&info->lock, flags);
5021
5022         timeout=100;
5023         while(timeout-- && !info->irq_occurred)
5024                 msleep_interruptible(10);
5025
5026         spin_lock_irqsave(&info->lock,flags);
5027         reset_port(info);
5028         spin_unlock_irqrestore(&info->lock,flags);
5029
5030         info->params.data_rate = speed;
5031         info->port.tty = oldtty;
5032
5033         info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
5034         return info->irq_occurred ? 0 : -ENODEV;
5035 }
5036
5037 static int loopback_test_rx(struct slgt_info *info)
5038 {
5039         unsigned char *src, *dest;
5040         int count;
5041
5042         if (desc_complete(info->rbufs[0])) {
5043                 count = desc_count(info->rbufs[0]);
5044                 src   = info->rbufs[0].buf;
5045                 dest  = info->tmp_rbuf;
5046
5047                 for( ; count ; count-=2, src+=2) {
5048                         /* src=data byte (src+1)=status byte */
5049                         if (!(*(src+1) & (BIT9 + BIT8))) {
5050                                 *dest = *src;
5051                                 dest++;
5052                                 info->tmp_rbuf_count++;
5053                         }
5054                 }
5055                 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
5056                 return 1;
5057         }
5058         return 0;
5059 }
5060
5061 static int loopback_test(struct slgt_info *info)
5062 {
5063 #define TESTFRAMESIZE 20
5064
5065         unsigned long timeout;
5066         u16 count = TESTFRAMESIZE;
5067         unsigned char buf[TESTFRAMESIZE];
5068         int rc = -ENODEV;
5069         unsigned long flags;
5070
5071         struct tty_struct *oldtty = info->port.tty;
5072         MGSL_PARAMS params;
5073
5074         memcpy(&params, &info->params, sizeof(params));
5075
5076         info->params.mode = MGSL_MODE_ASYNC;
5077         info->params.data_rate = 921600;
5078         info->params.loopback = 1;
5079         info->port.tty = NULL;
5080
5081         /* build and send transmit frame */
5082         for (count = 0; count < TESTFRAMESIZE; ++count)
5083                 buf[count] = (unsigned char)count;
5084
5085         info->tmp_rbuf_count = 0;
5086         memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
5087
5088         /* program hardware for HDLC and enabled receiver */
5089         spin_lock_irqsave(&info->lock,flags);
5090         async_mode(info);
5091         rx_start(info);
5092         tx_load(info, buf, count);
5093         spin_unlock_irqrestore(&info->lock, flags);
5094
5095         /* wait for receive complete */
5096         for (timeout = 100; timeout; --timeout) {
5097                 msleep_interruptible(10);
5098                 if (loopback_test_rx(info)) {
5099                         rc = 0;
5100                         break;
5101                 }
5102         }
5103
5104         /* verify received frame length and contents */
5105         if (!rc && (info->tmp_rbuf_count != count ||
5106                   memcmp(buf, info->tmp_rbuf, count))) {
5107                 rc = -ENODEV;
5108         }
5109
5110         spin_lock_irqsave(&info->lock,flags);
5111         reset_adapter(info);
5112         spin_unlock_irqrestore(&info->lock,flags);
5113
5114         memcpy(&info->params, &params, sizeof(info->params));
5115         info->port.tty = oldtty;
5116
5117         info->init_error = rc ? DiagStatus_DmaFailure : 0;
5118         return rc;
5119 }
5120
5121 static int adapter_test(struct slgt_info *info)
5122 {
5123         DBGINFO(("testing %s\n", info->device_name));
5124         if (register_test(info) < 0) {
5125                 printk("register test failure %s addr=%08X\n",
5126                         info->device_name, info->phys_reg_addr);
5127         } else if (irq_test(info) < 0) {
5128                 printk("IRQ test failure %s IRQ=%d\n",
5129                         info->device_name, info->irq_level);
5130         } else if (loopback_test(info) < 0) {
5131                 printk("loopback test failure %s\n", info->device_name);
5132         }
5133         return info->init_error;
5134 }
5135
5136 /*
5137  * transmit timeout handler
5138  */
5139 static void tx_timeout(unsigned long context)
5140 {
5141         struct slgt_info *info = (struct slgt_info*)context;
5142         unsigned long flags;
5143
5144         DBGINFO(("%s tx_timeout\n", info->device_name));
5145         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5146                 info->icount.txtimeout++;
5147         }
5148         spin_lock_irqsave(&info->lock,flags);
5149         tx_stop(info);
5150         spin_unlock_irqrestore(&info->lock,flags);
5151
5152 #if SYNCLINK_GENERIC_HDLC
5153         if (info->netcount)
5154                 hdlcdev_tx_done(info);
5155         else
5156 #endif
5157                 bh_transmit(info);
5158 }
5159
5160 /*
5161  * receive buffer polling timer
5162  */
5163 static void rx_timeout(unsigned long context)
5164 {
5165         struct slgt_info *info = (struct slgt_info*)context;
5166         unsigned long flags;
5167
5168         DBGINFO(("%s rx_timeout\n", info->device_name));
5169         spin_lock_irqsave(&info->lock, flags);
5170         info->pending_bh |= BH_RECEIVE;
5171         spin_unlock_irqrestore(&info->lock, flags);
5172         bh_handler(&info->task);
5173 }
5174