drivers/char/pcmcia/synclink_cs.c

   1 /*
   2  * linux/drivers/char/pcmcia/synclink_cs.c
   3  *
   4  * $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $
   5  *
   6  * Device driver for Microgate SyncLink PC Card
   7  * multiprotocol serial adapter.
   8  *
   9  * written by Paul Fulghum for Microgate Corporation
  10  * paulkf@microgate.com
  11  *
  12  * Microgate and SyncLink are trademarks of Microgate Corporation
  13  *
  14  * This code is released under the GNU General Public License (GPL)
  15  *
  16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  20  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  24  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  26  * OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  30 #if defined(__i386__)
  31 #  define BREAKPOINT() asm("   int $3");
  32 #else
  33 #  define BREAKPOINT() { }
  34 #endif
  35
  36 #define MAX_DEVICE_COUNT 4
  37
  38 #include <linux/module.h>
  39 #include <linux/errno.h>
  40 #include <linux/signal.h>
  41 #include <linux/sched.h>
  42 #include <linux/timer.h>
  43 #include <linux/time.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/tty.h>
  46 #include <linux/tty_flip.h>
  47 #include <linux/serial.h>
  48 #include <linux/major.h>
  49 #include <linux/string.h>
  50 #include <linux/fcntl.h>
  51 #include <linux/ptrace.h>
  52 #include <linux/ioport.h>
  53 #include <linux/mm.h>
  54 #include <linux/seq_file.h>
  55 #include <linux/slab.h>
  56 #include <linux/netdevice.h>
  57 #include <linux/vmalloc.h>
  58 #include <linux/init.h>
  59 #include <linux/delay.h>
  60 #include <linux/ioctl.h>
  61 #include <linux/synclink.h>
  62
  63 #include <asm/io.h>
  64 #include <asm/irq.h>
  65 #include <asm/dma.h>
  66 #include <linux/bitops.h>
  67 #include <asm/types.h>
  68 #include <linux/termios.h>
  69 #include <linux/workqueue.h>
  70 #include <linux/hdlc.h>
  71
  72 #include <pcmcia/cistpl.h>
  73 #include <pcmcia/cisreg.h>
  74 #include <pcmcia/ds.h>
  75
  76 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
  77 #define SYNCLINK_GENERIC_HDLC 1
  78 #else
  79 #define SYNCLINK_GENERIC_HDLC 0
  80 #endif
  81
  82 #define GET_USER(error,value,addr) error = get_user(value,addr)
  83 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  84 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  85 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  86
  87 #include <asm/uaccess.h>
  88
  89 static MGSL_PARAMS default_params = {
  90         MGSL_MODE_HDLC,                 /* unsigned long mode */
  91         0,                              /* unsigned char loopback; */
  92         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  93         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  94         0,                              /* unsigned long clock_speed; */
  95         0xff,                           /* unsigned char addr_filter; */
  96         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  97         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  98         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  99         9600,                           /* unsigned long data_rate; */
 100         8,                              /* unsigned char data_bits; */
 101         1,                              /* unsigned char stop_bits; */
 102         ASYNC_PARITY_NONE               /* unsigned char parity; */
 103 };
 104
 105 typedef struct
 106 {
 107         int count;
 108         unsigned char status;
 109         char data[1];
 110 } RXBUF;
 111
 112 /* The queue of BH actions to be performed */
 113
 114 #define BH_RECEIVE  1
 115 #define BH_TRANSMIT 2
 116 #define BH_STATUS   4
 117
 118 #define IO_PIN_SHUTDOWN_LIMIT 100
 119
 120 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 121
 122 struct _input_signal_events {
 123         int     ri_up;
 124         int     ri_down;
 125         int     dsr_up;
 126         int     dsr_down;
 127         int     dcd_up;
 128         int     dcd_down;
 129         int     cts_up;
 130         int     cts_down;
 131 };
 132
 133
 134 /*
 135  * Device instance data structure
 136  */
 137
 138 typedef struct _mgslpc_info {
 139         struct tty_port         port;
 140         void *if_ptr;   /* General purpose pointer (used by SPPP) */
 141         int                     magic;
 142         int                     line;
 143
 144         struct mgsl_icount      icount;
 145
 146         int                     timeout;
 147         int                     x_char;         /* xon/xoff character */
 148         unsigned char           read_status_mask;
 149         unsigned char           ignore_status_mask;
 150
 151         unsigned char *tx_buf;
 152         int            tx_put;
 153         int            tx_get;
 154         int            tx_count;
 155
 156         /* circular list of fixed length rx buffers */
 157
 158         unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
 159         int            rx_buf_total_size; /* size of memory allocated for rx buffers */
 160         int            rx_put;         /* index of next empty rx buffer */
 161         int            rx_get;         /* index of next full rx buffer */
 162         int            rx_buf_size;    /* size in bytes of single rx buffer */
 163         int            rx_buf_count;   /* total number of rx buffers */
 164         int            rx_frame_count; /* number of full rx buffers */
 165
 166         wait_queue_head_t       status_event_wait_q;
 167         wait_queue_head_t       event_wait_q;
 168         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 169         struct _mgslpc_info     *next_device;   /* device list link */
 170
 171         unsigned short imra_value;
 172         unsigned short imrb_value;
 173         unsigned char  pim_value;
 174
 175         spinlock_t lock;
 176         struct work_struct task;                /* task structure for scheduling bh */
 177
 178         u32 max_frame_size;
 179
 180         u32 pending_bh;
 181
 182         bool bh_running;
 183         bool bh_requested;
 184
 185         int dcd_chkcount; /* check counts to prevent */
 186         int cts_chkcount; /* too many IRQs if a signal */
 187         int dsr_chkcount; /* is floating */
 188         int ri_chkcount;
 189
 190         bool rx_enabled;
 191         bool rx_overflow;
 192
 193         bool tx_enabled;
 194         bool tx_active;
 195         bool tx_aborting;
 196         u32 idle_mode;
 197
 198         int if_mode; /* serial interface selection (RS-232, v.35 etc) */
 199
 200         char device_name[25];           /* device instance name */
 201
 202         unsigned int io_base;   /* base I/O address of adapter */
 203         unsigned int irq_level;
 204
 205         MGSL_PARAMS params;             /* communications parameters */
 206
 207         unsigned char serial_signals;   /* current serial signal states */
 208
 209         bool irq_occurred;              /* for diagnostics use */
 210         char testing_irq;
 211         unsigned int init_error;        /* startup error (DIAGS)        */
 212
 213         char *flag_buf;
 214         bool drop_rts_on_tx_done;
 215
 216         struct  _input_signal_events    input_signal_events;
 217
 218         /* PCMCIA support */
 219         struct pcmcia_device    *p_dev;
 220         int                   stop;
 221
 222         /* SPPP/Cisco HDLC device parts */
 223         int netcount;
 224         spinlock_t netlock;
 225
 226 #if SYNCLINK_GENERIC_HDLC
 227         struct net_device *netdev;
 228 #endif
 229
 230 } MGSLPC_INFO;
 231
 232 #define MGSLPC_MAGIC 0x5402
 233
 234 /*
 235  * The size of the serial xmit buffer is 1 page, or 4096 bytes
 236  */
 237 #define TXBUFSIZE 4096
 238
 239
 240 #define CHA     0x00   /* channel A offset */
 241 #define CHB     0x40   /* channel B offset */
 242
 243 /*
 244  *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
 245  */
 246 #undef PVR
 247
 248 #define RXFIFO  0
 249 #define TXFIFO  0
 250 #define STAR    0x20
 251 #define CMDR    0x20
 252 #define RSTA    0x21
 253 #define PRE     0x21
 254 #define MODE    0x22
 255 #define TIMR    0x23
 256 #define XAD1    0x24
 257 #define XAD2    0x25
 258 #define RAH1    0x26
 259 #define RAH2    0x27
 260 #define DAFO    0x27
 261 #define RAL1    0x28
 262 #define RFC     0x28
 263 #define RHCR    0x29
 264 #define RAL2    0x29
 265 #define RBCL    0x2a
 266 #define XBCL    0x2a
 267 #define RBCH    0x2b
 268 #define XBCH    0x2b
 269 #define CCR0    0x2c
 270 #define CCR1    0x2d
 271 #define CCR2    0x2e
 272 #define CCR3    0x2f
 273 #define VSTR    0x34
 274 #define BGR     0x34
 275 #define RLCR    0x35
 276 #define AML     0x36
 277 #define AMH     0x37
 278 #define GIS     0x38
 279 #define IVA     0x38
 280 #define IPC     0x39
 281 #define ISR     0x3a
 282 #define IMR     0x3a
 283 #define PVR     0x3c
 284 #define PIS     0x3d
 285 #define PIM     0x3d
 286 #define PCR     0x3e
 287 #define CCR4    0x3f
 288
 289 // IMR/ISR
 290
 291 #define IRQ_BREAK_ON    BIT15   // rx break detected
 292 #define IRQ_DATAOVERRUN BIT14   // receive data overflow
 293 #define IRQ_ALLSENT     BIT13   // all sent
 294 #define IRQ_UNDERRUN    BIT12   // transmit data underrun
 295 #define IRQ_TIMER       BIT11   // timer interrupt
 296 #define IRQ_CTS         BIT10   // CTS status change
 297 #define IRQ_TXREPEAT    BIT9    // tx message repeat
 298 #define IRQ_TXFIFO      BIT8    // transmit pool ready
 299 #define IRQ_RXEOM       BIT7    // receive message end
 300 #define IRQ_EXITHUNT    BIT6    // receive frame start
 301 #define IRQ_RXTIME      BIT6    // rx char timeout
 302 #define IRQ_DCD         BIT2    // carrier detect status change
 303 #define IRQ_OVERRUN     BIT1    // receive frame overflow
 304 #define IRQ_RXFIFO      BIT0    // receive pool full
 305
 306 // STAR
 307
 308 #define XFW   BIT6              // transmit FIFO write enable
 309 #define CEC   BIT2              // command executing
 310 #define CTS   BIT1              // CTS state
 311
 312 #define PVR_DTR      BIT0
 313 #define PVR_DSR      BIT1
 314 #define PVR_RI       BIT2
 315 #define PVR_AUTOCTS  BIT3
 316 #define PVR_RS232    0x20   /* 0010b */
 317 #define PVR_V35      0xe0   /* 1110b */
 318 #define PVR_RS422    0x40   /* 0100b */
 319
 320 /* Register access functions */
 321
 322 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
 323 #define read_reg(info, reg) inb((info)->io_base + (reg))
 324
 325 #define read_reg16(info, reg) inw((info)->io_base + (reg))
 326 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
 327
 328 #define set_reg_bits(info, reg, mask) \
 329     write_reg(info, (reg), \
 330                  (unsigned char) (read_reg(info, (reg)) | (mask)))
 331 #define clear_reg_bits(info, reg, mask) \
 332     write_reg(info, (reg), \
 333                  (unsigned char) (read_reg(info, (reg)) & ~(mask)))
 334 /*
 335  * interrupt enable/disable routines
 336  */
 337 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 338 {
 339         if (channel == CHA) {
 340                 info->imra_value |= mask;
 341                 write_reg16(info, CHA + IMR, info->imra_value);
 342         } else {
 343                 info->imrb_value |= mask;
 344                 write_reg16(info, CHB + IMR, info->imrb_value);
 345         }
 346 }
 347 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 348 {
 349         if (channel == CHA) {
 350                 info->imra_value &= ~mask;
 351                 write_reg16(info, CHA + IMR, info->imra_value);
 352         } else {
 353                 info->imrb_value &= ~mask;
 354                 write_reg16(info, CHB + IMR, info->imrb_value);
 355         }
 356 }
 357
 358 #define port_irq_disable(info, mask) \
 359   { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
 360
 361 #define port_irq_enable(info, mask) \
 362   { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
 363
 364 static void rx_start(MGSLPC_INFO *info);
 365 static void rx_stop(MGSLPC_INFO *info);
 366
 367 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
 368 static void tx_stop(MGSLPC_INFO *info);
 369 static void tx_set_idle(MGSLPC_INFO *info);
 370
 371 static void get_signals(MGSLPC_INFO *info);
 372 static void set_signals(MGSLPC_INFO *info);
 373
 374 static void reset_device(MGSLPC_INFO *info);
 375
 376 static void hdlc_mode(MGSLPC_INFO *info);
 377 static void async_mode(MGSLPC_INFO *info);
 378
 379 static void tx_timeout(unsigned long context);
 380
 381 static int carrier_raised(struct tty_port *port);
 382 static void dtr_rts(struct tty_port *port, int onoff);
 383
 384 #if SYNCLINK_GENERIC_HDLC
 385 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 386 static void hdlcdev_tx_done(MGSLPC_INFO *info);
 387 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
 388 static int  hdlcdev_init(MGSLPC_INFO *info);
 389 static void hdlcdev_exit(MGSLPC_INFO *info);
 390 #endif
 391
 392 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
 393
 394 static bool register_test(MGSLPC_INFO *info);
 395 static bool irq_test(MGSLPC_INFO *info);
 396 static int adapter_test(MGSLPC_INFO *info);
 397
 398 static int claim_resources(MGSLPC_INFO *info);
 399 static void release_resources(MGSLPC_INFO *info);
 400 static void mgslpc_add_device(MGSLPC_INFO *info);
 401 static void mgslpc_remove_device(MGSLPC_INFO *info);
 402
 403 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
 404 static void rx_reset_buffers(MGSLPC_INFO *info);
 405 static int  rx_alloc_buffers(MGSLPC_INFO *info);
 406 static void rx_free_buffers(MGSLPC_INFO *info);
 407
 408 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
 409
 410 /*
 411  * Bottom half interrupt handlers
 412  */
 413 static void bh_handler(struct work_struct *work);
 414 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
 415 static void bh_status(MGSLPC_INFO *info);
 416
 417 /*
 418  * ioctl handlers
 419  */
 420 static int tiocmget(struct tty_struct *tty);
 421 static int tiocmset(struct tty_struct *tty,
 422                                         unsigned int set, unsigned int clear);
 423 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
 424 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
 425 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
 426 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
 427 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
 428 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
 429 static int tx_abort(MGSLPC_INFO *info);
 430 static int set_rxenable(MGSLPC_INFO *info, int enable);
 431 static int wait_events(MGSLPC_INFO *info, int __user *mask);
 432
 433 static MGSLPC_INFO *mgslpc_device_list = NULL;
 434 static int mgslpc_device_count = 0;
 435
 436 /*
 437  * Set this param to non-zero to load eax with the
 438  * .text section address and breakpoint on module load.
 439  * This is useful for use with gdb and add-symbol-file command.
 440  */
 441 static bool break_on_load=0;
 442
 443 /*
 444  * Driver major number, defaults to zero to get auto
 445  * assigned major number. May be forced as module parameter.
 446  */
 447 static int ttymajor=0;
 448
 449 static int debug_level = 0;
 450 static int maxframe[MAX_DEVICE_COUNT] = {0,};
 451
 452 module_param(break_on_load, bool, 0);
 453 module_param(ttymajor, int, 0);
 454 module_param(debug_level, int, 0);
 455 module_param_array(maxframe, int, NULL, 0);
 456
 457 MODULE_LICENSE("GPL");
 458
 459 static char *driver_name = "SyncLink PC Card driver";
 460 static char *driver_version = "$Revision: 4.34 $";
 461
 462 static struct tty_driver *serial_driver;
 463
 464 /* number of characters left in xmit buffer before we ask for more */
 465 #define WAKEUP_CHARS 256
 466
 467 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
 468 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
 469
 470 /* PCMCIA prototypes */
 471
 472 static int mgslpc_config(struct pcmcia_device *link);
 473 static void mgslpc_release(u_long arg);
 474 static void mgslpc_detach(struct pcmcia_device *p_dev);
 475
 476 /*
 477  * 1st function defined in .text section. Calling this function in
 478  * init_module() followed by a breakpoint allows a remote debugger
 479  * (gdb) to get the .text address for the add-symbol-file command.
 480  * This allows remote debugging of dynamically loadable modules.
 481  */
 482 static void* mgslpc_get_text_ptr(void)
 483 {
 484         return mgslpc_get_text_ptr;
 485 }
 486
 487 /**
 488  * line discipline callback wrappers
 489  *
 490  * The wrappers maintain line discipline references
 491  * while calling into the line discipline.
 492  *
 493  * ldisc_receive_buf  - pass receive data to line discipline
 494  */
 495
 496 static void ldisc_receive_buf(struct tty_struct *tty,
 497                               const __u8 *data, char *flags, int count)
 498 {
 499         struct tty_ldisc *ld;
 500         if (!tty)
 501                 return;
 502         ld = tty_ldisc_ref(tty);
 503         if (ld) {
 504                 if (ld->ops->receive_buf)
 505                         ld->ops->receive_buf(tty, data, flags, count);
 506                 tty_ldisc_deref(ld);
 507         }
 508 }
 509
 510 static const struct tty_port_operations mgslpc_port_ops = {
 511         .carrier_raised = carrier_raised,
 512         .dtr_rts = dtr_rts
 513 };
 514
 515 static int mgslpc_probe(struct pcmcia_device *link)
 516 {
 517     MGSLPC_INFO *info;
 518     int ret;
 519
 520     if (debug_level >= DEBUG_LEVEL_INFO)
 521             printk("mgslpc_attach\n");
 522
 523     info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
 524     if (!info) {
 525             printk("Error can't allocate device instance data\n");
 526             return -ENOMEM;
 527     }
 528
 529     info->magic = MGSLPC_MAGIC;
 530     tty_port_init(&info->port);
 531     info->port.ops = &mgslpc_port_ops;
 532     INIT_WORK(&info->task, bh_handler);
 533     info->max_frame_size = 4096;
 534     info->port.close_delay = 5*HZ/10;
 535     info->port.closing_wait = 30*HZ;
 536     init_waitqueue_head(&info->status_event_wait_q);
 537     init_waitqueue_head(&info->event_wait_q);
 538     spin_lock_init(&info->lock);
 539     spin_lock_init(&info->netlock);
 540     memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
 541     info->idle_mode = HDLC_TXIDLE_FLAGS;
 542     info->imra_value = 0xffff;
 543     info->imrb_value = 0xffff;
 544     info->pim_value = 0xff;
 545
 546     info->p_dev = link;
 547     link->priv = info;
 548
 549     /* Initialize the struct pcmcia_device structure */
 550
 551     ret = mgslpc_config(link);
 552     if (ret) {
 553             tty_port_destroy(&info->port);
 554             return ret;
 555     }
 556
 557     mgslpc_add_device(info);
 558
 559     return 0;
 560 }
 561
 562 /* Card has been inserted.
 563  */
 564
 565 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
 566 {
 567         return pcmcia_request_io(p_dev);
 568 }
 569
 570 static int mgslpc_config(struct pcmcia_device *link)
 571 {
 572     MGSLPC_INFO *info = link->priv;
 573     int ret;
 574
 575     if (debug_level >= DEBUG_LEVEL_INFO)
 576             printk("mgslpc_config(0x%p)\n", link);
 577
 578     link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 579
 580     ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
 581     if (ret != 0)
 582             goto failed;
 583
 584     link->config_index = 8;
 585     link->config_regs = PRESENT_OPTION;
 586
 587     ret = pcmcia_request_irq(link, mgslpc_isr);
 588     if (ret)
 589             goto failed;
 590     ret = pcmcia_enable_device(link);
 591     if (ret)
 592             goto failed;
 593
 594     info->io_base = link->resource[0]->start;
 595     info->irq_level = link->irq;
 596     return 0;
 597
 598 failed:
 599     mgslpc_release((u_long)link);
 600     return -ENODEV;
 601 }
 602
 603 /* Card has been removed.
 604  * Unregister device and release PCMCIA configuration.
 605  * If device is open, postpone until it is closed.
 606  */
 607 static void mgslpc_release(u_long arg)
 608 {
 609         struct pcmcia_device *link = (struct pcmcia_device *)arg;
 610
 611         if (debug_level >= DEBUG_LEVEL_INFO)
 612                 printk("mgslpc_release(0x%p)\n", link);
 613
 614         pcmcia_disable_device(link);
 615 }
 616
 617 static void mgslpc_detach(struct pcmcia_device *link)
 618 {
 619         if (debug_level >= DEBUG_LEVEL_INFO)
 620                 printk("mgslpc_detach(0x%p)\n", link);
 621
 622         ((MGSLPC_INFO *)link->priv)->stop = 1;
 623         mgslpc_release((u_long)link);
 624
 625         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
 626 }
 627
 628 static int mgslpc_suspend(struct pcmcia_device *link)
 629 {
 630         MGSLPC_INFO *info = link->priv;
 631
 632         info->stop = 1;
 633
 634         return 0;
 635 }
 636
 637 static int mgslpc_resume(struct pcmcia_device *link)
 638 {
 639         MGSLPC_INFO *info = link->priv;
 640
 641         info->stop = 0;
 642
 643         return 0;
 644 }
 645
 646
 647 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
 648                                         char *name, const char *routine)
 649 {
 650 #ifdef MGSLPC_PARANOIA_CHECK
 651         static const char *badmagic =
 652                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
 653         static const char *badinfo =
 654                 "Warning: null mgslpc_info for (%s) in %s\n";
 655
 656         if (!info) {
 657                 printk(badinfo, name, routine);
 658                 return true;
 659         }
 660         if (info->magic != MGSLPC_MAGIC) {
 661                 printk(badmagic, name, routine);
 662                 return true;
 663         }
 664 #else
 665         if (!info)
 666                 return true;
 667 #endif
 668         return false;
 669 }
 670
 671
 672 #define CMD_RXFIFO      BIT7    // release current rx FIFO
 673 #define CMD_RXRESET     BIT6    // receiver reset
 674 #define CMD_RXFIFO_READ BIT5
 675 #define CMD_START_TIMER BIT4
 676 #define CMD_TXFIFO      BIT3    // release current tx FIFO
 677 #define CMD_TXEOM       BIT1    // transmit end message
 678 #define CMD_TXRESET     BIT0    // transmit reset
 679
 680 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
 681 {
 682         int i = 0;
 683         /* wait for command completion */
 684         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
 685                 udelay(1);
 686                 if (i++ == 1000)
 687                         return false;
 688         }
 689         return true;
 690 }
 691
 692 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
 693 {
 694         wait_command_complete(info, channel);
 695         write_reg(info, (unsigned char) (channel + CMDR), cmd);
 696 }
 697
 698 static void tx_pause(struct tty_struct *tty)
 699 {
 700         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 701         unsigned long flags;
 702
 703         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
 704                 return;
 705         if (debug_level >= DEBUG_LEVEL_INFO)
 706                 printk("tx_pause(%s)\n",info->device_name);
 707
 708         spin_lock_irqsave(&info->lock,flags);
 709         if (info->tx_enabled)
 710                 tx_stop(info);
 711         spin_unlock_irqrestore(&info->lock,flags);
 712 }
 713
 714 static void tx_release(struct tty_struct *tty)
 715 {
 716         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 717         unsigned long flags;
 718
 719         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
 720                 return;
 721         if (debug_level >= DEBUG_LEVEL_INFO)
 722                 printk("tx_release(%s)\n",info->device_name);
 723
 724         spin_lock_irqsave(&info->lock,flags);
 725         if (!info->tx_enabled)
 726                 tx_start(info, tty);
 727         spin_unlock_irqrestore(&info->lock,flags);
 728 }
 729
 730 /* Return next bottom half action to perform.
 731  * or 0 if nothing to do.
 732  */
 733 static int bh_action(MGSLPC_INFO *info)
 734 {
 735         unsigned long flags;
 736         int rc = 0;
 737
 738         spin_lock_irqsave(&info->lock,flags);
 739
 740         if (info->pending_bh & BH_RECEIVE) {
 741                 info->pending_bh &= ~BH_RECEIVE;
 742                 rc = BH_RECEIVE;
 743         } else if (info->pending_bh & BH_TRANSMIT) {
 744                 info->pending_bh &= ~BH_TRANSMIT;
 745                 rc = BH_TRANSMIT;
 746         } else if (info->pending_bh & BH_STATUS) {
 747                 info->pending_bh &= ~BH_STATUS;
 748                 rc = BH_STATUS;
 749         }
 750
 751         if (!rc) {
 752                 /* Mark BH routine as complete */
 753                 info->bh_running = false;
 754                 info->bh_requested = false;
 755         }
 756
 757         spin_unlock_irqrestore(&info->lock,flags);
 758
 759         return rc;
 760 }
 761
 762 static void bh_handler(struct work_struct *work)
 763 {
 764         MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
 765         struct tty_struct *tty;
 766         int action;
 767
 768         if (!info)
 769                 return;
 770
 771         if (debug_level >= DEBUG_LEVEL_BH)
 772                 printk( "%s(%d):bh_handler(%s) entry\n",
 773                         __FILE__,__LINE__,info->device_name);
 774
 775         info->bh_running = true;
 776         tty = tty_port_tty_get(&info->port);
 777
 778         while((action = bh_action(info)) != 0) {
 779
 780                 /* Process work item */
 781                 if ( debug_level >= DEBUG_LEVEL_BH )
 782                         printk( "%s(%d):bh_handler() work item action=%d\n",
 783                                 __FILE__,__LINE__,action);
 784
 785                 switch (action) {
 786
 787                 case BH_RECEIVE:
 788                         while(rx_get_frame(info, tty));
 789                         break;
 790                 case BH_TRANSMIT:
 791                         bh_transmit(info, tty);
 792                         break;
 793                 case BH_STATUS:
 794                         bh_status(info);
 795                         break;
 796                 default:
 797                         /* unknown work item ID */
 798                         printk("Unknown work item ID=%08X!\n", action);
 799                         break;
 800                 }
 801         }
 802
 803         tty_kref_put(tty);
 804         if (debug_level >= DEBUG_LEVEL_BH)
 805                 printk( "%s(%d):bh_handler(%s) exit\n",
 806                         __FILE__,__LINE__,info->device_name);
 807 }
 808
 809 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
 810 {
 811         if (debug_level >= DEBUG_LEVEL_BH)
 812                 printk("bh_transmit() entry on %s\n", info->device_name);
 813
 814         if (tty)
 815                 tty_wakeup(tty);
 816 }
 817
 818 static void bh_status(MGSLPC_INFO *info)
 819 {
 820         info->ri_chkcount = 0;
 821         info->dsr_chkcount = 0;
 822         info->dcd_chkcount = 0;
 823         info->cts_chkcount = 0;
 824 }
 825
 826 /* eom: non-zero = end of frame */
 827 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
 828 {
 829         unsigned char data[2];
 830         unsigned char fifo_count, read_count, i;
 831         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
 832
 833         if (debug_level >= DEBUG_LEVEL_ISR)
 834                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
 835
 836         if (!info->rx_enabled)
 837                 return;
 838
 839         if (info->rx_frame_count >= info->rx_buf_count) {
 840                 /* no more free buffers */
 841                 issue_command(info, CHA, CMD_RXRESET);
 842                 info->pending_bh |= BH_RECEIVE;
 843                 info->rx_overflow = true;
 844                 info->icount.buf_overrun++;
 845                 return;
 846         }
 847
 848         if (eom) {
 849                 /* end of frame, get FIFO count from RBCL register */
 850                 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
 851                         fifo_count = 32;
 852         } else
 853                 fifo_count = 32;
 854
 855         do {
 856                 if (fifo_count == 1) {
 857                         read_count = 1;
 858                         data[0] = read_reg(info, CHA + RXFIFO);
 859                 } else {
 860                         read_count = 2;
 861                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
 862                 }
 863                 fifo_count -= read_count;
 864                 if (!fifo_count && eom)
 865                         buf->status = data[--read_count];
 866
 867                 for (i = 0; i < read_count; i++) {
 868                         if (buf->count >= info->max_frame_size) {
 869                                 /* frame too large, reset receiver and reset current buffer */
 870                                 issue_command(info, CHA, CMD_RXRESET);
 871                                 buf->count = 0;
 872                                 return;
 873                         }
 874                         *(buf->data + buf->count) = data[i];
 875                         buf->count++;
 876                 }
 877         } while (fifo_count);
 878
 879         if (eom) {
 880                 info->pending_bh |= BH_RECEIVE;
 881                 info->rx_frame_count++;
 882                 info->rx_put++;
 883                 if (info->rx_put >= info->rx_buf_count)
 884                         info->rx_put = 0;
 885         }
 886         issue_command(info, CHA, CMD_RXFIFO);
 887 }
 888
 889 static void rx_ready_async(MGSLPC_INFO *info, int tcd, struct tty_struct *tty)
 890 {
 891         struct tty_port *port = &info->port;
 892         unsigned char data, status, flag;
 893         int fifo_count;
 894         int work = 0;
 895         struct mgsl_icount *icount = &info->icount;
 896
 897         if (!tty) {
 898                 /* tty is not available anymore */
 899                 issue_command(info, CHA, CMD_RXRESET);
 900                 if (debug_level >= DEBUG_LEVEL_ISR)
 901                         printk("%s(%d):rx_ready_async(tty=NULL)\n",__FILE__,__LINE__);
 902                 return;
 903         }
 904
 905         if (tcd) {
 906                 /* early termination, get FIFO count from RBCL register */
 907                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
 908
 909                 /* Zero fifo count could mean 0 or 32 bytes available.
 910                  * If BIT5 of STAR is set then at least 1 byte is available.
 911                  */
 912                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
 913                         fifo_count = 32;
 914         } else
 915                 fifo_count = 32;
 916
 917         tty_buffer_request_room(port, fifo_count);
 918         /* Flush received async data to receive data buffer. */
 919         while (fifo_count) {
 920                 data   = read_reg(info, CHA + RXFIFO);
 921                 status = read_reg(info, CHA + RXFIFO);
 922                 fifo_count -= 2;
 923
 924                 icount->rx++;
 925                 flag = TTY_NORMAL;
 926
 927                 // if no frameing/crc error then save data
 928                 // BIT7:parity error
 929                 // BIT6:framing error
 930
 931                 if (status & (BIT7 + BIT6)) {
 932                         if (status & BIT7)
 933                                 icount->parity++;
 934                         else
 935                                 icount->frame++;
 936
 937                         /* discard char if tty control flags say so */
 938                         if (status & info->ignore_status_mask)
 939                                 continue;
 940
 941                         status &= info->read_status_mask;
 942
 943                         if (status & BIT7)
 944                                 flag = TTY_PARITY;
 945                         else if (status & BIT6)
 946                                 flag = TTY_FRAME;
 947                 }
 948                 work += tty_insert_flip_char(port, data, flag);
 949         }
 950         issue_command(info, CHA, CMD_RXFIFO);
 951
 952         if (debug_level >= DEBUG_LEVEL_ISR) {
 953                 printk("%s(%d):rx_ready_async",
 954                         __FILE__,__LINE__);
 955                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
 956                         __FILE__,__LINE__,icount->rx,icount->brk,
 957                         icount->parity,icount->frame,icount->overrun);
 958         }
 959
 960         if (work)
 961                 tty_flip_buffer_push(tty);
 962 }
 963
 964
 965 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
 966 {
 967         if (!info->tx_active)
 968                 return;
 969
 970         info->tx_active = false;
 971         info->tx_aborting = false;
 972
 973         if (info->params.mode == MGSL_MODE_ASYNC)
 974                 return;
 975
 976         info->tx_count = info->tx_put = info->tx_get = 0;
 977         del_timer(&info->tx_timer);
 978
 979         if (info->drop_rts_on_tx_done) {
 980                 get_signals(info);
 981                 if (info->serial_signals & SerialSignal_RTS) {
 982                         info->serial_signals &= ~SerialSignal_RTS;
 983                         set_signals(info);
 984                 }
 985                 info->drop_rts_on_tx_done = false;
 986         }
 987
 988 #if SYNCLINK_GENERIC_HDLC
 989         if (info->netcount)
 990                 hdlcdev_tx_done(info);
 991         else
 992 #endif
 993         {
 994                 if (tty && (tty->stopped || tty->hw_stopped)) {
 995                         tx_stop(info);
 996                         return;
 997                 }
 998                 info->pending_bh |= BH_TRANSMIT;
 999         }
1000 }
1001
1002 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
1003 {
1004         unsigned char fifo_count = 32;
1005         int c;
1006
1007         if (debug_level >= DEBUG_LEVEL_ISR)
1008                 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
1009
1010         if (info->params.mode == MGSL_MODE_HDLC) {
1011                 if (!info->tx_active)
1012                         return;
1013         } else {
1014                 if (tty && (tty->stopped || tty->hw_stopped)) {
1015                         tx_stop(info);
1016                         return;
1017                 }
1018                 if (!info->tx_count)
1019                         info->tx_active = false;
1020         }
1021
1022         if (!info->tx_count)
1023                 return;
1024
1025         while (info->tx_count && fifo_count) {
1026                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1027
1028                 if (c == 1) {
1029                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1030                 } else {
1031                         write_reg16(info, CHA + TXFIFO,
1032                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1033                 }
1034                 info->tx_count -= c;
1035                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1036                 fifo_count -= c;
1037         }
1038
1039         if (info->params.mode == MGSL_MODE_ASYNC) {
1040                 if (info->tx_count < WAKEUP_CHARS)
1041                         info->pending_bh |= BH_TRANSMIT;
1042                 issue_command(info, CHA, CMD_TXFIFO);
1043         } else {
1044                 if (info->tx_count)
1045                         issue_command(info, CHA, CMD_TXFIFO);
1046                 else
1047                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1048         }
1049 }
1050
1051 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1052 {
1053         get_signals(info);
1054         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1055                 irq_disable(info, CHB, IRQ_CTS);
1056         info->icount.cts++;
1057         if (info->serial_signals & SerialSignal_CTS)
1058                 info->input_signal_events.cts_up++;
1059         else
1060                 info->input_signal_events.cts_down++;
1061         wake_up_interruptible(&info->status_event_wait_q);
1062         wake_up_interruptible(&info->event_wait_q);
1063
1064         if (tty && tty_port_cts_enabled(&info->port)) {
1065                 if (tty->hw_stopped) {
1066                         if (info->serial_signals & SerialSignal_CTS) {
1067                                 if (debug_level >= DEBUG_LEVEL_ISR)
1068                                         printk("CTS tx start...");
1069                                 tty->hw_stopped = 0;
1070                                 tx_start(info, tty);
1071                                 info->pending_bh |= BH_TRANSMIT;
1072                                 return;
1073                         }
1074                 } else {
1075                         if (!(info->serial_signals & SerialSignal_CTS)) {
1076                                 if (debug_level >= DEBUG_LEVEL_ISR)
1077                                         printk("CTS tx stop...");
1078                                 tty->hw_stopped = 1;
1079                                 tx_stop(info);
1080                         }
1081                 }
1082         }
1083         info->pending_bh |= BH_STATUS;
1084 }
1085
1086 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1087 {
1088         get_signals(info);
1089         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1090                 irq_disable(info, CHB, IRQ_DCD);
1091         info->icount.dcd++;
1092         if (info->serial_signals & SerialSignal_DCD) {
1093                 info->input_signal_events.dcd_up++;
1094         }
1095         else
1096                 info->input_signal_events.dcd_down++;
1097 #if SYNCLINK_GENERIC_HDLC
1098         if (info->netcount) {
1099                 if (info->serial_signals & SerialSignal_DCD)
1100                         netif_carrier_on(info->netdev);
1101                 else
1102                         netif_carrier_off(info->netdev);
1103         }
1104 #endif
1105         wake_up_interruptible(&info->status_event_wait_q);
1106         wake_up_interruptible(&info->event_wait_q);
1107
1108         if (info->port.flags & ASYNC_CHECK_CD) {
1109                 if (debug_level >= DEBUG_LEVEL_ISR)
1110                         printk("%s CD now %s...", info->device_name,
1111                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1112                 if (info->serial_signals & SerialSignal_DCD)
1113                         wake_up_interruptible(&info->port.open_wait);
1114                 else {
1115                         if (debug_level >= DEBUG_LEVEL_ISR)
1116                                 printk("doing serial hangup...");
1117                         if (tty)
1118                                 tty_hangup(tty);
1119                 }
1120         }
1121         info->pending_bh |= BH_STATUS;
1122 }
1123
1124 static void dsr_change(MGSLPC_INFO *info)
1125 {
1126         get_signals(info);
1127         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1128                 port_irq_disable(info, PVR_DSR);
1129         info->icount.dsr++;
1130         if (info->serial_signals & SerialSignal_DSR)
1131                 info->input_signal_events.dsr_up++;
1132         else
1133                 info->input_signal_events.dsr_down++;
1134         wake_up_interruptible(&info->status_event_wait_q);
1135         wake_up_interruptible(&info->event_wait_q);
1136         info->pending_bh |= BH_STATUS;
1137 }
1138
1139 static void ri_change(MGSLPC_INFO *info)
1140 {
1141         get_signals(info);
1142         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1143                 port_irq_disable(info, PVR_RI);
1144         info->icount.rng++;
1145         if (info->serial_signals & SerialSignal_RI)
1146                 info->input_signal_events.ri_up++;
1147         else
1148                 info->input_signal_events.ri_down++;
1149         wake_up_interruptible(&info->status_event_wait_q);
1150         wake_up_interruptible(&info->event_wait_q);
1151         info->pending_bh |= BH_STATUS;
1152 }
1153
1154 /* Interrupt service routine entry point.
1155  *
1156  * Arguments:
1157  *
1158  * irq     interrupt number that caused interrupt
1159  * dev_id  device ID supplied during interrupt registration
1160  */
1161 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1162 {
1163         MGSLPC_INFO *info = dev_id;
1164         struct tty_struct *tty;
1165         unsigned short isr;
1166         unsigned char gis, pis;
1167         int count=0;
1168
1169         if (debug_level >= DEBUG_LEVEL_ISR)
1170                 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1171
1172         if (!(info->p_dev->_locked))
1173                 return IRQ_HANDLED;
1174
1175         tty = tty_port_tty_get(&info->port);
1176
1177         spin_lock(&info->lock);
1178
1179         while ((gis = read_reg(info, CHA + GIS))) {
1180                 if (debug_level >= DEBUG_LEVEL_ISR)
1181                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1182
1183                 if ((gis & 0x70) || count > 1000) {
1184                         printk("synclink_cs:hardware failed or ejected\n");
1185                         break;
1186                 }
1187                 count++;
1188
1189                 if (gis & (BIT1 + BIT0)) {
1190                         isr = read_reg16(info, CHB + ISR);
1191                         if (isr & IRQ_DCD)
1192                                 dcd_change(info, tty);
1193                         if (isr & IRQ_CTS)
1194                                 cts_change(info, tty);
1195                 }
1196                 if (gis & (BIT3 + BIT2))
1197                 {
1198                         isr = read_reg16(info, CHA + ISR);
1199                         if (isr & IRQ_TIMER) {
1200                                 info->irq_occurred = true;
1201                                 irq_disable(info, CHA, IRQ_TIMER);
1202                         }
1203
1204                         /* receive IRQs */
1205                         if (isr & IRQ_EXITHUNT) {
1206                                 info->icount.exithunt++;
1207                                 wake_up_interruptible(&info->event_wait_q);
1208                         }
1209                         if (isr & IRQ_BREAK_ON) {
1210                                 info->icount.brk++;
1211                                 if (info->port.flags & ASYNC_SAK)
1212                                         do_SAK(tty);
1213                         }
1214                         if (isr & IRQ_RXTIME) {
1215                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1216                         }
1217                         if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1218                                 if (info->params.mode == MGSL_MODE_HDLC)
1219                                         rx_ready_hdlc(info, isr & IRQ_RXEOM);
1220                                 else
1221                                         rx_ready_async(info, isr & IRQ_RXEOM, tty);
1222                         }
1223
1224                         /* transmit IRQs */
1225                         if (isr & IRQ_UNDERRUN) {
1226                                 if (info->tx_aborting)
1227                                         info->icount.txabort++;
1228                                 else
1229                                         info->icount.txunder++;
1230                                 tx_done(info, tty);
1231                         }
1232                         else if (isr & IRQ_ALLSENT) {
1233                                 info->icount.txok++;
1234                                 tx_done(info, tty);
1235                         }
1236                         else if (isr & IRQ_TXFIFO)
1237                                 tx_ready(info, tty);
1238                 }
1239                 if (gis & BIT7) {
1240                         pis = read_reg(info, CHA + PIS);
1241                         if (pis & BIT1)
1242                                 dsr_change(info);
1243                         if (pis & BIT2)
1244                                 ri_change(info);
1245                 }
1246         }
1247
1248         /* Request bottom half processing if there's something
1249          * for it to do and the bh is not already running
1250          */
1251
1252         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1253                 if ( debug_level >= DEBUG_LEVEL_ISR )
1254                         printk("%s(%d):%s queueing bh task.\n",
1255                                 __FILE__,__LINE__,info->device_name);
1256                 schedule_work(&info->task);
1257                 info->bh_requested = true;
1258         }
1259
1260         spin_unlock(&info->lock);
1261         tty_kref_put(tty);
1262
1263         if (debug_level >= DEBUG_LEVEL_ISR)
1264                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1265                        __FILE__, __LINE__, info->irq_level);
1266
1267         return IRQ_HANDLED;
1268 }
1269
1270 /* Initialize and start device.
1271  */
1272 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1273 {
1274         int retval = 0;
1275
1276         if (debug_level >= DEBUG_LEVEL_INFO)
1277                 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1278
1279         if (info->port.flags & ASYNC_INITIALIZED)
1280                 return 0;
1281
1282         if (!info->tx_buf) {
1283                 /* allocate a page of memory for a transmit buffer */
1284                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1285                 if (!info->tx_buf) {
1286                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1287                                 __FILE__,__LINE__,info->device_name);
1288                         return -ENOMEM;
1289                 }
1290         }
1291
1292         info->pending_bh = 0;
1293
1294         memset(&info->icount, 0, sizeof(info->icount));
1295
1296         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1297
1298         /* Allocate and claim adapter resources */
1299         retval = claim_resources(info);
1300
1301         /* perform existence check and diagnostics */
1302         if ( !retval )
1303                 retval = adapter_test(info);
1304
1305         if ( retval ) {
1306                 if (capable(CAP_SYS_ADMIN) && tty)
1307                         set_bit(TTY_IO_ERROR, &tty->flags);
1308                 release_resources(info);
1309                 return retval;
1310         }
1311
1312         /* program hardware for current parameters */
1313         mgslpc_change_params(info, tty);
1314
1315         if (tty)
1316                 clear_bit(TTY_IO_ERROR, &tty->flags);
1317
1318         info->port.flags |= ASYNC_INITIALIZED;
1319
1320         return 0;
1321 }
1322
1323 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1324  */
1325 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1326 {
1327         unsigned long flags;
1328
1329         if (!(info->port.flags & ASYNC_INITIALIZED))
1330                 return;
1331
1332         if (debug_level >= DEBUG_LEVEL_INFO)
1333                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1334                          __FILE__,__LINE__, info->device_name );
1335
1336         /* clear status wait queue because status changes */
1337         /* can't happen after shutting down the hardware */
1338         wake_up_interruptible(&info->status_event_wait_q);
1339         wake_up_interruptible(&info->event_wait_q);
1340
1341         del_timer_sync(&info->tx_timer);
1342
1343         if (info->tx_buf) {
1344                 free_page((unsigned long) info->tx_buf);
1345                 info->tx_buf = NULL;
1346         }
1347
1348         spin_lock_irqsave(&info->lock,flags);
1349
1350         rx_stop(info);
1351         tx_stop(info);
1352
1353         /* TODO:disable interrupts instead of reset to preserve signal states */
1354         reset_device(info);
1355
1356         if (!tty || tty->termios.c_cflag & HUPCL) {
1357                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1358                 set_signals(info);
1359         }
1360
1361         spin_unlock_irqrestore(&info->lock,flags);
1362
1363         release_resources(info);
1364
1365         if (tty)
1366                 set_bit(TTY_IO_ERROR, &tty->flags);
1367
1368         info->port.flags &= ~ASYNC_INITIALIZED;
1369 }
1370
1371 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1372 {
1373         unsigned long flags;
1374
1375         spin_lock_irqsave(&info->lock,flags);
1376
1377         rx_stop(info);
1378         tx_stop(info);
1379         info->tx_count = info->tx_put = info->tx_get = 0;
1380
1381         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1382                 hdlc_mode(info);
1383         else
1384                 async_mode(info);
1385
1386         set_signals(info);
1387
1388         info->dcd_chkcount = 0;
1389         info->cts_chkcount = 0;
1390         info->ri_chkcount = 0;
1391         info->dsr_chkcount = 0;
1392
1393         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1394         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1395         get_signals(info);
1396
1397         if (info->netcount || (tty && (tty->termios.c_cflag & CREAD)))
1398                 rx_start(info);
1399
1400         spin_unlock_irqrestore(&info->lock,flags);
1401 }
1402
1403 /* Reconfigure adapter based on new parameters
1404  */
1405 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1406 {
1407         unsigned cflag;
1408         int bits_per_char;
1409
1410         if (!tty)
1411                 return;
1412
1413         if (debug_level >= DEBUG_LEVEL_INFO)
1414                 printk("%s(%d):mgslpc_change_params(%s)\n",
1415                          __FILE__,__LINE__, info->device_name );
1416
1417         cflag = tty->termios.c_cflag;
1418
1419         /* if B0 rate (hangup) specified then negate DTR and RTS */
1420         /* otherwise assert DTR and RTS */
1421         if (cflag & CBAUD)
1422                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1423         else
1424                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1425
1426         /* byte size and parity */
1427
1428         switch (cflag & CSIZE) {
1429         case CS5: info->params.data_bits = 5; break;
1430         case CS6: info->params.data_bits = 6; break;
1431         case CS7: info->params.data_bits = 7; break;
1432         case CS8: info->params.data_bits = 8; break;
1433         default:  info->params.data_bits = 7; break;
1434         }
1435
1436         if (cflag & CSTOPB)
1437                 info->params.stop_bits = 2;
1438         else
1439                 info->params.stop_bits = 1;
1440
1441         info->params.parity = ASYNC_PARITY_NONE;
1442         if (cflag & PARENB) {
1443                 if (cflag & PARODD)
1444                         info->params.parity = ASYNC_PARITY_ODD;
1445                 else
1446                         info->params.parity = ASYNC_PARITY_EVEN;
1447 #ifdef CMSPAR
1448                 if (cflag & CMSPAR)
1449                         info->params.parity = ASYNC_PARITY_SPACE;
1450 #endif
1451         }
1452
1453         /* calculate number of jiffies to transmit a full
1454          * FIFO (32 bytes) at specified data rate
1455          */
1456         bits_per_char = info->params.data_bits +
1457                         info->params.stop_bits + 1;
1458
1459         /* if port data rate is set to 460800 or less then
1460          * allow tty settings to override, otherwise keep the
1461          * current data rate.
1462          */
1463         if (info->params.data_rate <= 460800) {
1464                 info->params.data_rate = tty_get_baud_rate(tty);
1465         }
1466
1467         if ( info->params.data_rate ) {
1468                 info->timeout = (32*HZ*bits_per_char) /
1469                                 info->params.data_rate;
1470         }
1471         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1472
1473         if (cflag & CRTSCTS)
1474                 info->port.flags |= ASYNC_CTS_FLOW;
1475         else
1476                 info->port.flags &= ~ASYNC_CTS_FLOW;
1477
1478         if (cflag & CLOCAL)
1479                 info->port.flags &= ~ASYNC_CHECK_CD;
1480         else
1481                 info->port.flags |= ASYNC_CHECK_CD;
1482
1483         /* process tty input control flags */
1484
1485         info->read_status_mask = 0;
1486         if (I_INPCK(tty))
1487                 info->read_status_mask |= BIT7 | BIT6;
1488         if (I_IGNPAR(tty))
1489                 info->ignore_status_mask |= BIT7 | BIT6;
1490
1491         mgslpc_program_hw(info, tty);
1492 }
1493
1494 /* Add a character to the transmit buffer
1495  */
1496 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1497 {
1498         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1499         unsigned long flags;
1500
1501         if (debug_level >= DEBUG_LEVEL_INFO) {
1502                 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1503                         __FILE__,__LINE__,ch,info->device_name);
1504         }
1505
1506         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1507                 return 0;
1508
1509         if (!info->tx_buf)
1510                 return 0;
1511
1512         spin_lock_irqsave(&info->lock,flags);
1513
1514         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1515                 if (info->tx_count < TXBUFSIZE - 1) {
1516                         info->tx_buf[info->tx_put++] = ch;
1517                         info->tx_put &= TXBUFSIZE-1;
1518                         info->tx_count++;
1519                 }
1520         }
1521
1522         spin_unlock_irqrestore(&info->lock,flags);
1523         return 1;
1524 }
1525
1526 /* Enable transmitter so remaining characters in the
1527  * transmit buffer are sent.
1528  */
1529 static void mgslpc_flush_chars(struct tty_struct *tty)
1530 {
1531         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1532         unsigned long flags;
1533
1534         if (debug_level >= DEBUG_LEVEL_INFO)
1535                 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1536                         __FILE__,__LINE__,info->device_name,info->tx_count);
1537
1538         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1539                 return;
1540
1541         if (info->tx_count <= 0 || tty->stopped ||
1542             tty->hw_stopped || !info->tx_buf)
1543                 return;
1544
1545         if (debug_level >= DEBUG_LEVEL_INFO)
1546                 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1547                         __FILE__,__LINE__,info->device_name);
1548
1549         spin_lock_irqsave(&info->lock,flags);
1550         if (!info->tx_active)
1551                 tx_start(info, tty);
1552         spin_unlock_irqrestore(&info->lock,flags);
1553 }
1554
1555 /* Send a block of data
1556  *
1557  * Arguments:
1558  *
1559  * tty        pointer to tty information structure
1560  * buf        pointer to buffer containing send data
1561  * count      size of send data in bytes
1562  *
1563  * Returns: number of characters written
1564  */
1565 static int mgslpc_write(struct tty_struct * tty,
1566                         const unsigned char *buf, int count)
1567 {
1568         int c, ret = 0;
1569         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1570         unsigned long flags;
1571
1572         if (debug_level >= DEBUG_LEVEL_INFO)
1573                 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1574                         __FILE__,__LINE__,info->device_name,count);
1575
1576         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1577                 !info->tx_buf)
1578                 goto cleanup;
1579
1580         if (info->params.mode == MGSL_MODE_HDLC) {
1581                 if (count > TXBUFSIZE) {
1582                         ret = -EIO;
1583                         goto cleanup;
1584                 }
1585                 if (info->tx_active)
1586                         goto cleanup;
1587                 else if (info->tx_count)
1588                         goto start;
1589         }
1590
1591         for (;;) {
1592                 c = min(count,
1593                         min(TXBUFSIZE - info->tx_count - 1,
1594                             TXBUFSIZE - info->tx_put));
1595                 if (c <= 0)
1596                         break;
1597
1598                 memcpy(info->tx_buf + info->tx_put, buf, c);
1599
1600                 spin_lock_irqsave(&info->lock,flags);
1601                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1602                 info->tx_count += c;
1603                 spin_unlock_irqrestore(&info->lock,flags);
1604
1605                 buf += c;
1606                 count -= c;
1607                 ret += c;
1608         }
1609 start:
1610         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1611                 spin_lock_irqsave(&info->lock,flags);
1612                 if (!info->tx_active)
1613                         tx_start(info, tty);
1614                 spin_unlock_irqrestore(&info->lock,flags);
1615         }
1616 cleanup:
1617         if (debug_level >= DEBUG_LEVEL_INFO)
1618                 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1619                         __FILE__,__LINE__,info->device_name,ret);
1620         return ret;
1621 }
1622
1623 /* Return the count of free bytes in transmit buffer
1624  */
1625 static int mgslpc_write_room(struct tty_struct *tty)
1626 {
1627         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1628         int ret;
1629
1630         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1631                 return 0;
1632
1633         if (info->params.mode == MGSL_MODE_HDLC) {
1634                 /* HDLC (frame oriented) mode */
1635                 if (info->tx_active)
1636                         return 0;
1637                 else
1638                         return HDLC_MAX_FRAME_SIZE;
1639         } else {
1640                 ret = TXBUFSIZE - info->tx_count - 1;
1641                 if (ret < 0)
1642                         ret = 0;
1643         }
1644
1645         if (debug_level >= DEBUG_LEVEL_INFO)
1646                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1647                          __FILE__,__LINE__, info->device_name, ret);
1648         return ret;
1649 }
1650
1651 /* Return the count of bytes in transmit buffer
1652  */
1653 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1654 {
1655         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1656         int rc;
1657
1658         if (debug_level >= DEBUG_LEVEL_INFO)
1659                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1660                          __FILE__,__LINE__, info->device_name );
1661
1662         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1663                 return 0;
1664
1665         if (info->params.mode == MGSL_MODE_HDLC)
1666                 rc = info->tx_active ? info->max_frame_size : 0;
1667         else
1668                 rc = info->tx_count;
1669
1670         if (debug_level >= DEBUG_LEVEL_INFO)
1671                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1672                          __FILE__,__LINE__, info->device_name, rc);
1673
1674         return rc;
1675 }
1676
1677 /* Discard all data in the send buffer
1678  */
1679 static void mgslpc_flush_buffer(struct tty_struct *tty)
1680 {
1681         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1682         unsigned long flags;
1683
1684         if (debug_level >= DEBUG_LEVEL_INFO)
1685                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1686                          __FILE__,__LINE__, info->device_name );
1687
1688         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1689                 return;
1690
1691         spin_lock_irqsave(&info->lock,flags);
1692         info->tx_count = info->tx_put = info->tx_get = 0;
1693         del_timer(&info->tx_timer);
1694         spin_unlock_irqrestore(&info->lock,flags);
1695
1696         wake_up_interruptible(&tty->write_wait);
1697         tty_wakeup(tty);
1698 }
1699
1700 /* Send a high-priority XON/XOFF character
1701  */
1702 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1703 {
1704         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1705         unsigned long flags;
1706
1707         if (debug_level >= DEBUG_LEVEL_INFO)
1708                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1709                          __FILE__,__LINE__, info->device_name, ch );
1710
1711         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1712                 return;
1713
1714         info->x_char = ch;
1715         if (ch) {
1716                 spin_lock_irqsave(&info->lock,flags);
1717                 if (!info->tx_enabled)
1718                         tx_start(info, tty);
1719                 spin_unlock_irqrestore(&info->lock,flags);
1720         }
1721 }
1722
1723 /* Signal remote device to throttle send data (our receive data)
1724  */
1725 static void mgslpc_throttle(struct tty_struct * tty)
1726 {
1727         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1728         unsigned long flags;
1729
1730         if (debug_level >= DEBUG_LEVEL_INFO)
1731                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1732                          __FILE__,__LINE__, info->device_name );
1733
1734         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1735                 return;
1736
1737         if (I_IXOFF(tty))
1738                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1739
1740         if (tty->termios.c_cflag & CRTSCTS) {
1741                 spin_lock_irqsave(&info->lock,flags);
1742                 info->serial_signals &= ~SerialSignal_RTS;
1743                 set_signals(info);
1744                 spin_unlock_irqrestore(&info->lock,flags);
1745         }
1746 }
1747
1748 /* Signal remote device to stop throttling send data (our receive data)
1749  */
1750 static void mgslpc_unthrottle(struct tty_struct * tty)
1751 {
1752         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1753         unsigned long flags;
1754
1755         if (debug_level >= DEBUG_LEVEL_INFO)
1756                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1757                          __FILE__,__LINE__, info->device_name );
1758
1759         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1760                 return;
1761
1762         if (I_IXOFF(tty)) {
1763                 if (info->x_char)
1764                         info->x_char = 0;
1765                 else
1766                         mgslpc_send_xchar(tty, START_CHAR(tty));
1767         }
1768
1769         if (tty->termios.c_cflag & CRTSCTS) {
1770                 spin_lock_irqsave(&info->lock,flags);
1771                 info->serial_signals |= SerialSignal_RTS;
1772                 set_signals(info);
1773                 spin_unlock_irqrestore(&info->lock,flags);
1774         }
1775 }
1776
1777 /* get the current serial statistics
1778  */
1779 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1780 {
1781         int err;
1782         if (debug_level >= DEBUG_LEVEL_INFO)
1783                 printk("get_params(%s)\n", info->device_name);
1784         if (!user_icount) {
1785                 memset(&info->icount, 0, sizeof(info->icount));
1786         } else {
1787                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1788                 if (err)
1789                         return -EFAULT;
1790         }
1791         return 0;
1792 }
1793
1794 /* get the current serial parameters
1795  */
1796 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1797 {
1798         int err;
1799         if (debug_level >= DEBUG_LEVEL_INFO)
1800                 printk("get_params(%s)\n", info->device_name);
1801         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1802         if (err)
1803                 return -EFAULT;
1804         return 0;
1805 }
1806
1807 /* set the serial parameters
1808  *
1809  * Arguments:
1810  *
1811  *      info            pointer to device instance data
1812  *      new_params      user buffer containing new serial params
1813  *
1814  * Returns:     0 if success, otherwise error code
1815  */
1816 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1817 {
1818         unsigned long flags;
1819         MGSL_PARAMS tmp_params;
1820         int err;
1821
1822         if (debug_level >= DEBUG_LEVEL_INFO)
1823                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1824                         info->device_name );
1825         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1826         if (err) {
1827                 if ( debug_level >= DEBUG_LEVEL_INFO )
1828                         printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1829                                 __FILE__,__LINE__,info->device_name);
1830                 return -EFAULT;
1831         }
1832
1833         spin_lock_irqsave(&info->lock,flags);
1834         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1835         spin_unlock_irqrestore(&info->lock,flags);
1836
1837         mgslpc_change_params(info, tty);
1838
1839         return 0;
1840 }
1841
1842 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1843 {
1844         int err;
1845         if (debug_level >= DEBUG_LEVEL_INFO)
1846                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1847         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1848         if (err)
1849                 return -EFAULT;
1850         return 0;
1851 }
1852
1853 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1854 {
1855         unsigned long flags;
1856         if (debug_level >= DEBUG_LEVEL_INFO)
1857                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1858         spin_lock_irqsave(&info->lock,flags);
1859         info->idle_mode = idle_mode;
1860         tx_set_idle(info);
1861         spin_unlock_irqrestore(&info->lock,flags);
1862         return 0;
1863 }
1864
1865 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1866 {
1867         int err;
1868         if (debug_level >= DEBUG_LEVEL_INFO)
1869                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1870         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1871         if (err)
1872                 return -EFAULT;
1873         return 0;
1874 }
1875
1876 static int set_interface(MGSLPC_INFO * info, int if_mode)
1877 {
1878         unsigned long flags;
1879         unsigned char val;
1880         if (debug_level >= DEBUG_LEVEL_INFO)
1881                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1882         spin_lock_irqsave(&info->lock,flags);
1883         info->if_mode = if_mode;
1884
1885         val = read_reg(info, PVR) & 0x0f;
1886         switch (info->if_mode)
1887         {
1888         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1889         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1890         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1891         }
1892         write_reg(info, PVR, val);
1893
1894         spin_unlock_irqrestore(&info->lock,flags);
1895         return 0;
1896 }
1897
1898 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1899 {
1900         unsigned long flags;
1901
1902         if (debug_level >= DEBUG_LEVEL_INFO)
1903                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1904
1905         spin_lock_irqsave(&info->lock,flags);
1906         if (enable) {
1907                 if (!info->tx_enabled)
1908                         tx_start(info, tty);
1909         } else {
1910                 if (info->tx_enabled)
1911                         tx_stop(info);
1912         }
1913         spin_unlock_irqrestore(&info->lock,flags);
1914         return 0;
1915 }
1916
1917 static int tx_abort(MGSLPC_INFO * info)
1918 {
1919         unsigned long flags;
1920
1921         if (debug_level >= DEBUG_LEVEL_INFO)
1922                 printk("tx_abort(%s)\n", info->device_name);
1923
1924         spin_lock_irqsave(&info->lock,flags);
1925         if (info->tx_active && info->tx_count &&
1926             info->params.mode == MGSL_MODE_HDLC) {
1927                 /* clear data count so FIFO is not filled on next IRQ.
1928                  * This results in underrun and abort transmission.
1929                  */
1930                 info->tx_count = info->tx_put = info->tx_get = 0;
1931                 info->tx_aborting = true;
1932         }
1933         spin_unlock_irqrestore(&info->lock,flags);
1934         return 0;
1935 }
1936
1937 static int set_rxenable(MGSLPC_INFO * info, int enable)
1938 {
1939         unsigned long flags;
1940
1941         if (debug_level >= DEBUG_LEVEL_INFO)
1942                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1943
1944         spin_lock_irqsave(&info->lock,flags);
1945         if (enable) {
1946                 if (!info->rx_enabled)
1947                         rx_start(info);
1948         } else {
1949                 if (info->rx_enabled)
1950                         rx_stop(info);
1951         }
1952         spin_unlock_irqrestore(&info->lock,flags);
1953         return 0;
1954 }
1955
1956 /* wait for specified event to occur
1957  *
1958  * Arguments:           info    pointer to device instance data
1959  *                      mask    pointer to bitmask of events to wait for
1960  * Return Value:        0       if successful and bit mask updated with
1961  *                              of events triggerred,
1962  *                      otherwise error code
1963  */
1964 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1965 {
1966         unsigned long flags;
1967         int s;
1968         int rc=0;
1969         struct mgsl_icount cprev, cnow;
1970         int events;
1971         int mask;
1972         struct  _input_signal_events oldsigs, newsigs;
1973         DECLARE_WAITQUEUE(wait, current);
1974
1975         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1976         if (rc)
1977                 return  -EFAULT;
1978
1979         if (debug_level >= DEBUG_LEVEL_INFO)
1980                 printk("wait_events(%s,%d)\n", info->device_name, mask);
1981
1982         spin_lock_irqsave(&info->lock,flags);
1983
1984         /* return immediately if state matches requested events */
1985         get_signals(info);
1986         s = info->serial_signals;
1987         events = mask &
1988                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1989                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1990                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1991                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1992         if (events) {
1993                 spin_unlock_irqrestore(&info->lock,flags);
1994                 goto exit;
1995         }
1996
1997         /* save current irq counts */
1998         cprev = info->icount;
1999         oldsigs = info->input_signal_events;
2000
2001         if ((info->params.mode == MGSL_MODE_HDLC) &&
2002             (mask & MgslEvent_ExitHuntMode))
2003                 irq_enable(info, CHA, IRQ_EXITHUNT);
2004
2005         set_current_state(TASK_INTERRUPTIBLE);
2006         add_wait_queue(&info->event_wait_q, &wait);
2007
2008         spin_unlock_irqrestore(&info->lock,flags);
2009
2010
2011         for(;;) {
2012                 schedule();
2013                 if (signal_pending(current)) {
2014                         rc = -ERESTARTSYS;
2015                         break;
2016                 }
2017
2018                 /* get current irq counts */
2019                 spin_lock_irqsave(&info->lock,flags);
2020                 cnow = info->icount;
2021                 newsigs = info->input_signal_events;
2022                 set_current_state(TASK_INTERRUPTIBLE);
2023                 spin_unlock_irqrestore(&info->lock,flags);
2024
2025                 /* if no change, wait aborted for some reason */
2026                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2027                     newsigs.dsr_down == oldsigs.dsr_down &&
2028                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2029                     newsigs.dcd_down == oldsigs.dcd_down &&
2030                     newsigs.cts_up   == oldsigs.cts_up   &&
2031                     newsigs.cts_down == oldsigs.cts_down &&
2032                     newsigs.ri_up    == oldsigs.ri_up    &&
2033                     newsigs.ri_down  == oldsigs.ri_down  &&
2034                     cnow.exithunt    == cprev.exithunt   &&
2035                     cnow.rxidle      == cprev.rxidle) {
2036                         rc = -EIO;
2037                         break;
2038                 }
2039
2040                 events = mask &
2041                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2042                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2043                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2044                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2045                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2046                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2047                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2048                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2049                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2050                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2051                 if (events)
2052                         break;
2053
2054                 cprev = cnow;
2055                 oldsigs = newsigs;
2056         }
2057
2058         remove_wait_queue(&info->event_wait_q, &wait);
2059         set_current_state(TASK_RUNNING);
2060
2061         if (mask & MgslEvent_ExitHuntMode) {
2062                 spin_lock_irqsave(&info->lock,flags);
2063                 if (!waitqueue_active(&info->event_wait_q))
2064                         irq_disable(info, CHA, IRQ_EXITHUNT);
2065                 spin_unlock_irqrestore(&info->lock,flags);
2066         }
2067 exit:
2068         if (rc == 0)
2069                 PUT_USER(rc, events, mask_ptr);
2070         return rc;
2071 }
2072
2073 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2074 {
2075         unsigned long flags;
2076         int rc;
2077         struct mgsl_icount cprev, cnow;
2078         DECLARE_WAITQUEUE(wait, current);
2079
2080         /* save current irq counts */
2081         spin_lock_irqsave(&info->lock,flags);
2082         cprev = info->icount;
2083         add_wait_queue(&info->status_event_wait_q, &wait);
2084         set_current_state(TASK_INTERRUPTIBLE);
2085         spin_unlock_irqrestore(&info->lock,flags);
2086
2087         for(;;) {
2088                 schedule();
2089                 if (signal_pending(current)) {
2090                         rc = -ERESTARTSYS;
2091                         break;
2092                 }
2093
2094                 /* get new irq counts */
2095                 spin_lock_irqsave(&info->lock,flags);
2096                 cnow = info->icount;
2097                 set_current_state(TASK_INTERRUPTIBLE);
2098                 spin_unlock_irqrestore(&info->lock,flags);
2099
2100                 /* if no change, wait aborted for some reason */
2101                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2102                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2103                         rc = -EIO;
2104                         break;
2105                 }
2106
2107                 /* check for change in caller specified modem input */
2108                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2109                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2110                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2111                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2112                         rc = 0;
2113                         break;
2114                 }
2115
2116                 cprev = cnow;
2117         }
2118         remove_wait_queue(&info->status_event_wait_q, &wait);
2119         set_current_state(TASK_RUNNING);
2120         return rc;
2121 }
2122
2123 /* return the state of the serial control and status signals
2124  */
2125 static int tiocmget(struct tty_struct *tty)
2126 {
2127         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2128         unsigned int result;
2129         unsigned long flags;
2130
2131         spin_lock_irqsave(&info->lock,flags);
2132         get_signals(info);
2133         spin_unlock_irqrestore(&info->lock,flags);
2134
2135         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2136                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2137                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2138                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2139                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2140                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2141
2142         if (debug_level >= DEBUG_LEVEL_INFO)
2143                 printk("%s(%d):%s tiocmget() value=%08X\n",
2144                          __FILE__,__LINE__, info->device_name, result );
2145         return result;
2146 }
2147
2148 /* set modem control signals (DTR/RTS)
2149  */
2150 static int tiocmset(struct tty_struct *tty,
2151                     unsigned int set, unsigned int clear)
2152 {
2153         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2154         unsigned long flags;
2155
2156         if (debug_level >= DEBUG_LEVEL_INFO)
2157                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2158                         __FILE__,__LINE__,info->device_name, set, clear);
2159
2160         if (set & TIOCM_RTS)
2161                 info->serial_signals |= SerialSignal_RTS;
2162         if (set & TIOCM_DTR)
2163                 info->serial_signals |= SerialSignal_DTR;
2164         if (clear & TIOCM_RTS)
2165                 info->serial_signals &= ~SerialSignal_RTS;
2166         if (clear & TIOCM_DTR)
2167                 info->serial_signals &= ~SerialSignal_DTR;
2168
2169         spin_lock_irqsave(&info->lock,flags);
2170         set_signals(info);
2171         spin_unlock_irqrestore(&info->lock,flags);
2172
2173         return 0;
2174 }
2175
2176 /* Set or clear transmit break condition
2177  *
2178  * Arguments:           tty             pointer to tty instance data
2179  *                      break_state     -1=set break condition, 0=clear
2180  */
2181 static int mgslpc_break(struct tty_struct *tty, int break_state)
2182 {
2183         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2184         unsigned long flags;
2185
2186         if (debug_level >= DEBUG_LEVEL_INFO)
2187                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2188                          __FILE__,__LINE__, info->device_name, break_state);
2189
2190         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2191                 return -EINVAL;
2192
2193         spin_lock_irqsave(&info->lock,flags);
2194         if (break_state == -1)
2195                 set_reg_bits(info, CHA+DAFO, BIT6);
2196         else
2197                 clear_reg_bits(info, CHA+DAFO, BIT6);
2198         spin_unlock_irqrestore(&info->lock,flags);
2199         return 0;
2200 }
2201
2202 static int mgslpc_get_icount(struct tty_struct *tty,
2203                                 struct serial_icounter_struct *icount)
2204 {
2205         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2206         struct mgsl_icount cnow;        /* kernel counter temps */
2207         unsigned long flags;
2208
2209         spin_lock_irqsave(&info->lock,flags);
2210         cnow = info->icount;
2211         spin_unlock_irqrestore(&info->lock,flags);
2212
2213         icount->cts = cnow.cts;
2214         icount->dsr = cnow.dsr;
2215         icount->rng = cnow.rng;
2216         icount->dcd = cnow.dcd;
2217         icount->rx = cnow.rx;
2218         icount->tx = cnow.tx;
2219         icount->frame = cnow.frame;
2220         icount->overrun = cnow.overrun;
2221         icount->parity = cnow.parity;
2222         icount->brk = cnow.brk;
2223         icount->buf_overrun = cnow.buf_overrun;
2224
2225         return 0;
2226 }
2227
2228 /* Service an IOCTL request
2229  *
2230  * Arguments:
2231  *
2232  *      tty     pointer to tty instance data
2233  *      cmd     IOCTL command code
2234  *      arg     command argument/context
2235  *
2236  * Return Value:        0 if success, otherwise error code
2237  */
2238 static int mgslpc_ioctl(struct tty_struct *tty,
2239                         unsigned int cmd, unsigned long arg)
2240 {
2241         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2242         void __user *argp = (void __user *)arg;
2243
2244         if (debug_level >= DEBUG_LEVEL_INFO)
2245                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2246                         info->device_name, cmd );
2247
2248         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2249                 return -ENODEV;
2250
2251         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2252             (cmd != TIOCMIWAIT)) {
2253                 if (tty->flags & (1 << TTY_IO_ERROR))
2254                     return -EIO;
2255         }
2256
2257         switch (cmd) {
2258         case MGSL_IOCGPARAMS:
2259                 return get_params(info, argp);
2260         case MGSL_IOCSPARAMS:
2261                 return set_params(info, argp, tty);
2262         case MGSL_IOCGTXIDLE:
2263                 return get_txidle(info, argp);
2264         case MGSL_IOCSTXIDLE:
2265                 return set_txidle(info, (int)arg);
2266         case MGSL_IOCGIF:
2267                 return get_interface(info, argp);
2268         case MGSL_IOCSIF:
2269                 return set_interface(info,(int)arg);
2270         case MGSL_IOCTXENABLE:
2271                 return set_txenable(info,(int)arg, tty);
2272         case MGSL_IOCRXENABLE:
2273                 return set_rxenable(info,(int)arg);
2274         case MGSL_IOCTXABORT:
2275                 return tx_abort(info);
2276         case MGSL_IOCGSTATS:
2277                 return get_stats(info, argp);
2278         case MGSL_IOCWAITEVENT:
2279                 return wait_events(info, argp);
2280         case TIOCMIWAIT:
2281                 return modem_input_wait(info,(int)arg);
2282         default:
2283                 return -ENOIOCTLCMD;
2284         }
2285         return 0;
2286 }
2287
2288 /* Set new termios settings
2289  *
2290  * Arguments:
2291  *
2292  *      tty             pointer to tty structure
2293  *      termios         pointer to buffer to hold returned old termios
2294  */
2295 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2296 {
2297         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2298         unsigned long flags;
2299
2300         if (debug_level >= DEBUG_LEVEL_INFO)
2301                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2302                         tty->driver->name );
2303
2304         /* just return if nothing has changed */
2305         if ((tty->termios.c_cflag == old_termios->c_cflag)
2306             && (RELEVANT_IFLAG(tty->termios.c_iflag)
2307                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2308           return;
2309
2310         mgslpc_change_params(info, tty);
2311
2312         /* Handle transition to B0 status */
2313         if (old_termios->c_cflag & CBAUD &&
2314             !(tty->termios.c_cflag & CBAUD)) {
2315                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2316                 spin_lock_irqsave(&info->lock,flags);
2317                 set_signals(info);
2318                 spin_unlock_irqrestore(&info->lock,flags);
2319         }
2320
2321         /* Handle transition away from B0 status */
2322         if (!(old_termios->c_cflag & CBAUD) &&
2323             tty->termios.c_cflag & CBAUD) {
2324                 info->serial_signals |= SerialSignal_DTR;
2325                 if (!(tty->termios.c_cflag & CRTSCTS) ||
2326                     !test_bit(TTY_THROTTLED, &tty->flags)) {
2327                         info->serial_signals |= SerialSignal_RTS;
2328                 }
2329                 spin_lock_irqsave(&info->lock,flags);
2330                 set_signals(info);
2331                 spin_unlock_irqrestore(&info->lock,flags);
2332         }
2333
2334         /* Handle turning off CRTSCTS */
2335         if (old_termios->c_cflag & CRTSCTS &&
2336             !(tty->termios.c_cflag & CRTSCTS)) {
2337                 tty->hw_stopped = 0;
2338                 tx_release(tty);
2339         }
2340 }
2341
2342 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2343 {
2344         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2345         struct tty_port *port = &info->port;
2346
2347         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2348                 return;
2349
2350         if (debug_level >= DEBUG_LEVEL_INFO)
2351                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2352                          __FILE__,__LINE__, info->device_name, port->count);
2353
2354         WARN_ON(!port->count);
2355
2356         if (tty_port_close_start(port, tty, filp) == 0)
2357                 goto cleanup;
2358
2359         if (port->flags & ASYNC_INITIALIZED)
2360                 mgslpc_wait_until_sent(tty, info->timeout);
2361
2362         mgslpc_flush_buffer(tty);
2363
2364         tty_ldisc_flush(tty);
2365         shutdown(info, tty);
2366
2367         tty_port_close_end(port, tty);
2368         tty_port_tty_set(port, NULL);
2369 cleanup:
2370         if (debug_level >= DEBUG_LEVEL_INFO)
2371                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2372                         tty->driver->name, port->count);
2373 }
2374
2375 /* Wait until the transmitter is empty.
2376  */
2377 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2378 {
2379         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2380         unsigned long orig_jiffies, char_time;
2381
2382         if (!info )
2383                 return;
2384
2385         if (debug_level >= DEBUG_LEVEL_INFO)
2386                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2387                          __FILE__,__LINE__, info->device_name );
2388
2389         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2390                 return;
2391
2392         if (!(info->port.flags & ASYNC_INITIALIZED))
2393                 goto exit;
2394
2395         orig_jiffies = jiffies;
2396
2397         /* Set check interval to 1/5 of estimated time to
2398          * send a character, and make it at least 1. The check
2399          * interval should also be less than the timeout.
2400          * Note: use tight timings here to satisfy the NIST-PCTS.
2401          */
2402
2403         if ( info->params.data_rate ) {
2404                 char_time = info->timeout/(32 * 5);
2405                 if (!char_time)
2406                         char_time++;
2407         } else
2408                 char_time = 1;
2409
2410         if (timeout)
2411                 char_time = min_t(unsigned long, char_time, timeout);
2412
2413         if (info->params.mode == MGSL_MODE_HDLC) {
2414                 while (info->tx_active) {
2415                         msleep_interruptible(jiffies_to_msecs(char_time));
2416                         if (signal_pending(current))
2417                                 break;
2418                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2419                                 break;
2420                 }
2421         } else {
2422                 while ((info->tx_count || info->tx_active) &&
2423                         info->tx_enabled) {
2424                         msleep_interruptible(jiffies_to_msecs(char_time));
2425                         if (signal_pending(current))
2426                                 break;
2427                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2428                                 break;
2429                 }
2430         }
2431
2432 exit:
2433         if (debug_level >= DEBUG_LEVEL_INFO)
2434                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2435                          __FILE__,__LINE__, info->device_name );
2436 }
2437
2438 /* Called by tty_hangup() when a hangup is signaled.
2439  * This is the same as closing all open files for the port.
2440  */
2441 static void mgslpc_hangup(struct tty_struct *tty)
2442 {
2443         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2444
2445         if (debug_level >= DEBUG_LEVEL_INFO)
2446                 printk("%s(%d):mgslpc_hangup(%s)\n",
2447                          __FILE__,__LINE__, info->device_name );
2448
2449         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2450                 return;
2451
2452         mgslpc_flush_buffer(tty);
2453         shutdown(info, tty);
2454         tty_port_hangup(&info->port);
2455 }
2456
2457 static int carrier_raised(struct tty_port *port)
2458 {
2459         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2460         unsigned long flags;
2461
2462         spin_lock_irqsave(&info->lock,flags);
2463         get_signals(info);
2464         spin_unlock_irqrestore(&info->lock,flags);
2465
2466         if (info->serial_signals & SerialSignal_DCD)
2467                 return 1;
2468         return 0;
2469 }
2470
2471 static void dtr_rts(struct tty_port *port, int onoff)
2472 {
2473         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2474         unsigned long flags;
2475
2476         spin_lock_irqsave(&info->lock,flags);
2477         if (onoff)
2478                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2479         else
2480                 info->serial_signals &= ~SerialSignal_RTS + SerialSignal_DTR;
2481         set_signals(info);
2482         spin_unlock_irqrestore(&info->lock,flags);
2483 }
2484
2485
2486 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2487 {
2488         MGSLPC_INFO     *info;
2489         struct tty_port *port;
2490         int                     retval, line;
2491         unsigned long flags;
2492
2493         /* verify range of specified line number */
2494         line = tty->index;
2495         if (line >= mgslpc_device_count) {
2496                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2497                         __FILE__,__LINE__,line);
2498                 return -ENODEV;
2499         }
2500
2501         /* find the info structure for the specified line */
2502         info = mgslpc_device_list;
2503         while(info && info->line != line)
2504                 info = info->next_device;
2505         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2506                 return -ENODEV;
2507
2508         port = &info->port;
2509         tty->driver_data = info;
2510         tty_port_tty_set(port, tty);
2511
2512         if (debug_level >= DEBUG_LEVEL_INFO)
2513                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2514                          __FILE__,__LINE__,tty->driver->name, port->count);
2515
2516         /* If port is closing, signal caller to try again */
2517         if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2518                 if (port->flags & ASYNC_CLOSING)
2519                         interruptible_sleep_on(&port->close_wait);
2520                 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2521                         -EAGAIN : -ERESTARTSYS);
2522                 goto cleanup;
2523         }
2524
2525         port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2526
2527         spin_lock_irqsave(&info->netlock, flags);
2528         if (info->netcount) {
2529                 retval = -EBUSY;
2530                 spin_unlock_irqrestore(&info->netlock, flags);
2531                 goto cleanup;
2532         }
2533         spin_lock(&port->lock);
2534         port->count++;
2535         spin_unlock(&port->lock);
2536         spin_unlock_irqrestore(&info->netlock, flags);
2537
2538         if (port->count == 1) {
2539                 /* 1st open on this device, init hardware */
2540                 retval = startup(info, tty);
2541                 if (retval < 0)
2542                         goto cleanup;
2543         }
2544
2545         retval = tty_port_block_til_ready(&info->port, tty, filp);
2546         if (retval) {
2547                 if (debug_level >= DEBUG_LEVEL_INFO)
2548                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2549                                  __FILE__,__LINE__, info->device_name, retval);
2550                 goto cleanup;
2551         }
2552
2553         if (debug_level >= DEBUG_LEVEL_INFO)
2554                 printk("%s(%d):mgslpc_open(%s) success\n",
2555                          __FILE__,__LINE__, info->device_name);
2556         retval = 0;
2557
2558 cleanup:
2559         return retval;
2560 }
2561
2562 /*
2563  * /proc fs routines....
2564  */
2565
2566 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2567 {
2568         char    stat_buf[30];
2569         unsigned long flags;
2570
2571         seq_printf(m, "%s:io:%04X irq:%d",
2572                       info->device_name, info->io_base, info->irq_level);
2573
2574         /* output current serial signal states */
2575         spin_lock_irqsave(&info->lock,flags);
2576         get_signals(info);
2577         spin_unlock_irqrestore(&info->lock,flags);
2578
2579         stat_buf[0] = 0;
2580         stat_buf[1] = 0;
2581         if (info->serial_signals & SerialSignal_RTS)
2582                 strcat(stat_buf, "|RTS");
2583         if (info->serial_signals & SerialSignal_CTS)
2584                 strcat(stat_buf, "|CTS");
2585         if (info->serial_signals & SerialSignal_DTR)
2586                 strcat(stat_buf, "|DTR");
2587         if (info->serial_signals & SerialSignal_DSR)
2588                 strcat(stat_buf, "|DSR");
2589         if (info->serial_signals & SerialSignal_DCD)
2590                 strcat(stat_buf, "|CD");
2591         if (info->serial_signals & SerialSignal_RI)
2592                 strcat(stat_buf, "|RI");
2593
2594         if (info->params.mode == MGSL_MODE_HDLC) {
2595                 seq_printf(m, " HDLC txok:%d rxok:%d",
2596                               info->icount.txok, info->icount.rxok);
2597                 if (info->icount.txunder)
2598                         seq_printf(m, " txunder:%d", info->icount.txunder);
2599                 if (info->icount.txabort)
2600                         seq_printf(m, " txabort:%d", info->icount.txabort);
2601                 if (info->icount.rxshort)
2602                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
2603                 if (info->icount.rxlong)
2604                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
2605                 if (info->icount.rxover)
2606                         seq_printf(m, " rxover:%d", info->icount.rxover);
2607                 if (info->icount.rxcrc)
2608                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2609         } else {
2610                 seq_printf(m, " ASYNC tx:%d rx:%d",
2611                               info->icount.tx, info->icount.rx);
2612                 if (info->icount.frame)
2613                         seq_printf(m, " fe:%d", info->icount.frame);
2614                 if (info->icount.parity)
2615                         seq_printf(m, " pe:%d", info->icount.parity);
2616                 if (info->icount.brk)
2617                         seq_printf(m, " brk:%d", info->icount.brk);
2618                 if (info->icount.overrun)
2619                         seq_printf(m, " oe:%d", info->icount.overrun);
2620         }
2621
2622         /* Append serial signal status to end */
2623         seq_printf(m, " %s\n", stat_buf+1);
2624
2625         seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2626                        info->tx_active,info->bh_requested,info->bh_running,
2627                        info->pending_bh);
2628 }
2629
2630 /* Called to print information about devices
2631  */
2632 static int mgslpc_proc_show(struct seq_file *m, void *v)
2633 {
2634         MGSLPC_INFO *info;
2635
2636         seq_printf(m, "synclink driver:%s\n", driver_version);
2637
2638         info = mgslpc_device_list;
2639         while( info ) {
2640                 line_info(m, info);
2641                 info = info->next_device;
2642         }
2643         return 0;
2644 }
2645
2646 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2647 {
2648         return single_open(file, mgslpc_proc_show, NULL);
2649 }
2650
2651 static const struct file_operations mgslpc_proc_fops = {
2652         .owner          = THIS_MODULE,
2653         .open           = mgslpc_proc_open,
2654         .read           = seq_read,
2655         .llseek         = seq_lseek,
2656         .release        = single_release,
2657 };
2658
2659 static int rx_alloc_buffers(MGSLPC_INFO *info)
2660 {
2661         /* each buffer has header and data */
2662         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2663
2664         /* calculate total allocation size for 8 buffers */
2665         info->rx_buf_total_size = info->rx_buf_size * 8;
2666
2667         /* limit total allocated memory */
2668         if (info->rx_buf_total_size > 0x10000)
2669                 info->rx_buf_total_size = 0x10000;
2670
2671         /* calculate number of buffers */
2672         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2673
2674         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2675         if (info->rx_buf == NULL)
2676                 return -ENOMEM;
2677
2678         /* unused flag buffer to satisfy receive_buf calling interface */
2679         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
2680         if (!info->flag_buf) {
2681                 kfree(info->rx_buf);
2682                 info->rx_buf = NULL;
2683                 return -ENOMEM;
2684         }
2685
2686         rx_reset_buffers(info);
2687         return 0;
2688 }
2689
2690 static void rx_free_buffers(MGSLPC_INFO *info)
2691 {
2692         kfree(info->rx_buf);
2693         info->rx_buf = NULL;
2694         kfree(info->flag_buf);
2695         info->flag_buf = NULL;
2696 }
2697
2698 static int claim_resources(MGSLPC_INFO *info)
2699 {
2700         if (rx_alloc_buffers(info) < 0 ) {
2701                 printk( "Can't allocate rx buffer %s\n", info->device_name);
2702                 release_resources(info);
2703                 return -ENODEV;
2704         }
2705         return 0;
2706 }
2707
2708 static void release_resources(MGSLPC_INFO *info)
2709 {
2710         if (debug_level >= DEBUG_LEVEL_INFO)
2711                 printk("release_resources(%s)\n", info->device_name);
2712         rx_free_buffers(info);
2713 }
2714
2715 /* Add the specified device instance data structure to the
2716  * global linked list of devices and increment the device count.
2717  *
2718  * Arguments:           info    pointer to device instance data
2719  */
2720 static void mgslpc_add_device(MGSLPC_INFO *info)
2721 {
2722         info->next_device = NULL;
2723         info->line = mgslpc_device_count;
2724         sprintf(info->device_name,"ttySLP%d",info->line);
2725
2726         if (info->line < MAX_DEVICE_COUNT) {
2727                 if (maxframe[info->line])
2728                         info->max_frame_size = maxframe[info->line];
2729         }
2730
2731         mgslpc_device_count++;
2732
2733         if (!mgslpc_device_list)
2734                 mgslpc_device_list = info;
2735         else {
2736                 MGSLPC_INFO *current_dev = mgslpc_device_list;
2737                 while( current_dev->next_device )
2738                         current_dev = current_dev->next_device;
2739                 current_dev->next_device = info;
2740         }
2741
2742         if (info->max_frame_size < 4096)
2743                 info->max_frame_size = 4096;
2744         else if (info->max_frame_size > 65535)
2745                 info->max_frame_size = 65535;
2746
2747         printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2748                 info->device_name, info->io_base, info->irq_level);
2749
2750 #if SYNCLINK_GENERIC_HDLC
2751         hdlcdev_init(info);
2752 #endif
2753         tty_port_register_device(&info->port, serial_driver, info->line,
2754                         &info->p_dev->dev);
2755 }
2756
2757 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2758 {
2759         MGSLPC_INFO *info = mgslpc_device_list;
2760         MGSLPC_INFO *last = NULL;
2761
2762         while(info) {
2763                 if (info == remove_info) {
2764                         if (last)
2765                                 last->next_device = info->next_device;
2766                         else
2767                                 mgslpc_device_list = info->next_device;
2768                         tty_unregister_device(serial_driver, info->line);
2769 #if SYNCLINK_GENERIC_HDLC
2770                         hdlcdev_exit(info);
2771 #endif
2772                         release_resources(info);
2773                         tty_port_destroy(&info->port);
2774                         kfree(info);
2775                         mgslpc_device_count--;
2776                         return;
2777                 }
2778                 last = info;
2779                 info = info->next_device;
2780         }
2781 }
2782
2783 static const struct pcmcia_device_id mgslpc_ids[] = {
2784         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2785         PCMCIA_DEVICE_NULL
2786 };
2787 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2788
2789 static struct pcmcia_driver mgslpc_driver = {
2790         .owner          = THIS_MODULE,
2791         .name           = "synclink_cs",
2792         .probe          = mgslpc_probe,
2793         .remove         = mgslpc_detach,
2794         .id_table       = mgslpc_ids,
2795         .suspend        = mgslpc_suspend,
2796         .resume         = mgslpc_resume,
2797 };
2798
2799 static const struct tty_operations mgslpc_ops = {
2800         .open = mgslpc_open,
2801         .close = mgslpc_close,
2802         .write = mgslpc_write,
2803         .put_char = mgslpc_put_char,
2804         .flush_chars = mgslpc_flush_chars,
2805         .write_room = mgslpc_write_room,
2806         .chars_in_buffer = mgslpc_chars_in_buffer,
2807         .flush_buffer = mgslpc_flush_buffer,
2808         .ioctl = mgslpc_ioctl,
2809         .throttle = mgslpc_throttle,
2810         .unthrottle = mgslpc_unthrottle,
2811         .send_xchar = mgslpc_send_xchar,
2812         .break_ctl = mgslpc_break,
2813         .wait_until_sent = mgslpc_wait_until_sent,
2814         .set_termios = mgslpc_set_termios,
2815         .stop = tx_pause,
2816         .start = tx_release,
2817         .hangup = mgslpc_hangup,
2818         .tiocmget = tiocmget,
2819         .tiocmset = tiocmset,
2820         .get_icount = mgslpc_get_icount,
2821         .proc_fops = &mgslpc_proc_fops,
2822 };
2823
2824 static int __init synclink_cs_init(void)
2825 {
2826         int rc;
2827
2828         if (break_on_load) {
2829                 mgslpc_get_text_ptr();
2830                 BREAKPOINT();
2831         }
2832
2833         serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2834                         TTY_DRIVER_REAL_RAW |
2835                         TTY_DRIVER_DYNAMIC_DEV);
2836         if (IS_ERR(serial_driver)) {
2837                 rc = PTR_ERR(serial_driver);
2838                 goto err;
2839         }
2840
2841         /* Initialize the tty_driver structure */
2842         serial_driver->driver_name = "synclink_cs";
2843         serial_driver->name = "ttySLP";
2844         serial_driver->major = ttymajor;
2845         serial_driver->minor_start = 64;
2846         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2847         serial_driver->subtype = SERIAL_TYPE_NORMAL;
2848         serial_driver->init_termios = tty_std_termios;
2849         serial_driver->init_termios.c_cflag =
2850         B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2851         tty_set_operations(serial_driver, &mgslpc_ops);
2852
2853         rc = tty_register_driver(serial_driver);
2854         if (rc < 0) {
2855                 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2856                                 __FILE__, __LINE__);
2857                 goto err_put_tty;
2858         }
2859
2860         rc = pcmcia_register_driver(&mgslpc_driver);
2861         if (rc < 0)
2862                 goto err_unreg_tty;
2863
2864         printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2865                         serial_driver->major);
2866
2867         return 0;
2868 err_unreg_tty:
2869         tty_unregister_driver(serial_driver);
2870 err_put_tty:
2871         put_tty_driver(serial_driver);
2872 err:
2873         return rc;
2874 }
2875
2876 static void __exit synclink_cs_exit(void)
2877 {
2878         pcmcia_unregister_driver(&mgslpc_driver);
2879         tty_unregister_driver(serial_driver);
2880         put_tty_driver(serial_driver);
2881 }
2882
2883 module_init(synclink_cs_init);
2884 module_exit(synclink_cs_exit);
2885
2886 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2887 {
2888         unsigned int M, N;
2889         unsigned char val;
2890
2891         /* note:standard BRG mode is broken in V3.2 chip
2892          * so enhanced mode is always used
2893          */
2894
2895         if (rate) {
2896                 N = 3686400 / rate;
2897                 if (!N)
2898                         N = 1;
2899                 N >>= 1;
2900                 for (M = 1; N > 64 && M < 16; M++)
2901                         N >>= 1;
2902                 N--;
2903
2904                 /* BGR[5..0] = N
2905                  * BGR[9..6] = M
2906                  * BGR[7..0] contained in BGR register
2907                  * BGR[9..8] contained in CCR2[7..6]
2908                  * divisor = (N+1)*2^M
2909                  *
2910                  * Note: M *must* not be zero (causes asymetric duty cycle)
2911                  */
2912                 write_reg(info, (unsigned char) (channel + BGR),
2913                                   (unsigned char) ((M << 6) + N));
2914                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2915                 val |= ((M << 4) & 0xc0);
2916                 write_reg(info, (unsigned char) (channel + CCR2), val);
2917         }
2918 }
2919
2920 /* Enabled the AUX clock output at the specified frequency.
2921  */
2922 static void enable_auxclk(MGSLPC_INFO *info)
2923 {
2924         unsigned char val;
2925
2926         /* MODE
2927          *
2928          * 07..06  MDS[1..0] 10 = transparent HDLC mode
2929          * 05      ADM Address Mode, 0 = no addr recognition
2930          * 04      TMD Timer Mode, 0 = external
2931          * 03      RAC Receiver Active, 0 = inactive
2932          * 02      RTS 0=RTS active during xmit, 1=RTS always active
2933          * 01      TRS Timer Resolution, 1=512
2934          * 00      TLP Test Loop, 0 = no loop
2935          *
2936          * 1000 0010
2937          */
2938         val = 0x82;
2939
2940         /* channel B RTS is used to enable AUXCLK driver on SP505 */
2941         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2942                 val |= BIT2;
2943         write_reg(info, CHB + MODE, val);
2944
2945         /* CCR0
2946          *
2947          * 07      PU Power Up, 1=active, 0=power down
2948          * 06      MCE Master Clock Enable, 1=enabled
2949          * 05      Reserved, 0
2950          * 04..02  SC[2..0] Encoding
2951          * 01..00  SM[1..0] Serial Mode, 00=HDLC
2952          *
2953          * 11000000
2954          */
2955         write_reg(info, CHB + CCR0, 0xc0);
2956
2957         /* CCR1
2958          *
2959          * 07      SFLG Shared Flag, 0 = disable shared flags
2960          * 06      GALP Go Active On Loop, 0 = not used
2961          * 05      GLP Go On Loop, 0 = not used
2962          * 04      ODS Output Driver Select, 1=TxD is push-pull output
2963          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
2964          * 02..00  CM[2..0] Clock Mode
2965          *
2966          * 0001 0111
2967          */
2968         write_reg(info, CHB + CCR1, 0x17);
2969
2970         /* CCR2 (Channel B)
2971          *
2972          * 07..06  BGR[9..8] Baud rate bits 9..8
2973          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
2974          * 04      SSEL Clock source select, 1=submode b
2975          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
2976          * 02      RWX Read/Write Exchange 0=disabled
2977          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
2978          * 00      DIV, data inversion 0=disabled, 1=enabled
2979          *
2980          * 0011 1000
2981          */
2982         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2983                 write_reg(info, CHB + CCR2, 0x38);
2984         else
2985                 write_reg(info, CHB + CCR2, 0x30);
2986
2987         /* CCR4
2988          *
2989          * 07      MCK4 Master Clock Divide by 4, 1=enabled
2990          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
2991          * 05      TST1 Test Pin, 0=normal operation
2992          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
2993          * 03..02  Reserved, must be 0
2994          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
2995          *
2996          * 0101 0000
2997          */
2998         write_reg(info, CHB + CCR4, 0x50);
2999
3000         /* if auxclk not enabled, set internal BRG so
3001          * CTS transitions can be detected (requires TxC)
3002          */
3003         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3004                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3005         else
3006                 mgslpc_set_rate(info, CHB, 921600);
3007 }
3008
3009 static void loopback_enable(MGSLPC_INFO *info)
3010 {
3011         unsigned char val;
3012
3013         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3014         val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3015         write_reg(info, CHA + CCR1, val);
3016
3017         /* CCR2:04 SSEL Clock source select, 1=submode b */
3018         val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3019         write_reg(info, CHA + CCR2, val);
3020
3021         /* set LinkSpeed if available, otherwise default to 2Mbps */
3022         if (info->params.clock_speed)
3023                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3024         else
3025                 mgslpc_set_rate(info, CHA, 1843200);
3026
3027         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3028         val = read_reg(info, CHA + MODE) | BIT0;
3029         write_reg(info, CHA + MODE, val);
3030 }
3031
3032 static void hdlc_mode(MGSLPC_INFO *info)
3033 {
3034         unsigned char val;
3035         unsigned char clkmode, clksubmode;
3036
3037         /* disable all interrupts */
3038         irq_disable(info, CHA, 0xffff);
3039         irq_disable(info, CHB, 0xffff);
3040         port_irq_disable(info, 0xff);
3041
3042         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3043         clkmode = clksubmode = 0;
3044         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3045             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3046                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3047                 clkmode = 7;
3048         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3049                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3050                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3051                 clkmode = 7;
3052                 clksubmode = 1;
3053         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3054                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3055                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3056                         clkmode = 6;
3057                         clksubmode = 1;
3058                 } else {
3059                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3060                         clkmode = 6;
3061                 }
3062         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3063                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3064                 clksubmode = 1;
3065         }
3066
3067         /* MODE
3068          *
3069          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3070          * 05      ADM Address Mode, 0 = no addr recognition
3071          * 04      TMD Timer Mode, 0 = external
3072          * 03      RAC Receiver Active, 0 = inactive
3073          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3074          * 01      TRS Timer Resolution, 1=512
3075          * 00      TLP Test Loop, 0 = no loop
3076          *
3077          * 1000 0010
3078          */
3079         val = 0x82;
3080         if (info->params.loopback)
3081                 val |= BIT0;
3082
3083         /* preserve RTS state */
3084         if (info->serial_signals & SerialSignal_RTS)
3085                 val |= BIT2;
3086         write_reg(info, CHA + MODE, val);
3087
3088         /* CCR0
3089          *
3090          * 07      PU Power Up, 1=active, 0=power down
3091          * 06      MCE Master Clock Enable, 1=enabled
3092          * 05      Reserved, 0
3093          * 04..02  SC[2..0] Encoding
3094          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3095          *
3096          * 11000000
3097          */
3098         val = 0xc0;
3099         switch (info->params.encoding)
3100         {
3101         case HDLC_ENCODING_NRZI:
3102                 val |= BIT3;
3103                 break;
3104         case HDLC_ENCODING_BIPHASE_SPACE:
3105                 val |= BIT4;
3106                 break;          // FM0
3107         case HDLC_ENCODING_BIPHASE_MARK:
3108                 val |= BIT4 + BIT2;
3109                 break;          // FM1
3110         case HDLC_ENCODING_BIPHASE_LEVEL:
3111                 val |= BIT4 + BIT3;
3112                 break;          // Manchester
3113         }
3114         write_reg(info, CHA + CCR0, val);
3115
3116         /* CCR1
3117          *
3118          * 07      SFLG Shared Flag, 0 = disable shared flags
3119          * 06      GALP Go Active On Loop, 0 = not used
3120          * 05      GLP Go On Loop, 0 = not used
3121          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3122          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3123          * 02..00  CM[2..0] Clock Mode
3124          *
3125          * 0001 0000
3126          */
3127         val = 0x10 + clkmode;
3128         write_reg(info, CHA + CCR1, val);
3129
3130         /* CCR2
3131          *
3132          * 07..06  BGR[9..8] Baud rate bits 9..8
3133          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3134          * 04      SSEL Clock source select, 1=submode b
3135          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3136          * 02      RWX Read/Write Exchange 0=disabled
3137          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3138          * 00      DIV, data inversion 0=disabled, 1=enabled
3139          *
3140          * 0000 0000
3141          */
3142         val = 0x00;
3143         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3144             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3145                 val |= BIT5;
3146         if (clksubmode)
3147                 val |= BIT4;
3148         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3149                 val |= BIT1;
3150         if (info->params.encoding == HDLC_ENCODING_NRZB)
3151                 val |= BIT0;
3152         write_reg(info, CHA + CCR2, val);
3153
3154         /* CCR3
3155          *
3156          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3157          * 05      EPT Enable preamble transmission, 1=enabled
3158          * 04      RADD Receive address pushed to FIFO, 0=disabled
3159          * 03      CRL CRC Reset Level, 0=FFFF
3160          * 02      RCRC Rx CRC 0=On 1=Off
3161          * 01      TCRC Tx CRC 0=On 1=Off
3162          * 00      PSD DPLL Phase Shift Disable
3163          *
3164          * 0000 0000
3165          */
3166         val = 0x00;
3167         if (info->params.crc_type == HDLC_CRC_NONE)
3168                 val |= BIT2 + BIT1;
3169         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3170                 val |= BIT5;
3171         switch (info->params.preamble_length)
3172         {
3173         case HDLC_PREAMBLE_LENGTH_16BITS:
3174                 val |= BIT6;
3175                 break;
3176         case HDLC_PREAMBLE_LENGTH_32BITS:
3177                 val |= BIT6;
3178                 break;
3179         case HDLC_PREAMBLE_LENGTH_64BITS:
3180                 val |= BIT7 + BIT6;
3181                 break;
3182         }
3183         write_reg(info, CHA + CCR3, val);
3184
3185         /* PRE - Preamble pattern */
3186         val = 0;
3187         switch (info->params.preamble)
3188         {
3189         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3190         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3191         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3192         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3193         }
3194         write_reg(info, CHA + PRE, val);
3195
3196         /* CCR4
3197          *
3198          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3199          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3200          * 05      TST1 Test Pin, 0=normal operation
3201          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3202          * 03..02  Reserved, must be 0
3203          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3204          *
3205          * 0101 0000
3206          */
3207         val = 0x50;
3208         write_reg(info, CHA + CCR4, val);
3209         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3210                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3211         else
3212                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3213
3214         /* RLCR Receive length check register
3215          *
3216          * 7     1=enable receive length check
3217          * 6..0  Max frame length = (RL + 1) * 32
3218          */
3219         write_reg(info, CHA + RLCR, 0);
3220
3221         /* XBCH Transmit Byte Count High
3222          *
3223          * 07      DMA mode, 0 = interrupt driven
3224          * 06      NRM, 0=ABM (ignored)
3225          * 05      CAS Carrier Auto Start
3226          * 04      XC Transmit Continuously (ignored)
3227          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3228          *
3229          * 0000 0000
3230          */
3231         val = 0x00;
3232         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3233                 val |= BIT5;
3234         write_reg(info, CHA + XBCH, val);
3235         enable_auxclk(info);
3236         if (info->params.loopback || info->testing_irq)
3237                 loopback_enable(info);
3238         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3239         {
3240                 irq_enable(info, CHB, IRQ_CTS);
3241                 /* PVR[3] 1=AUTO CTS active */
3242                 set_reg_bits(info, CHA + PVR, BIT3);
3243         } else
3244                 clear_reg_bits(info, CHA + PVR, BIT3);
3245
3246         irq_enable(info, CHA,
3247                          IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3248                          IRQ_UNDERRUN + IRQ_TXFIFO);
3249         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3250         wait_command_complete(info, CHA);
3251         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3252
3253         /* Master clock mode enabled above to allow reset commands
3254          * to complete even if no data clocks are present.
3255          *
3256          * Disable master clock mode for normal communications because
3257          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3258          * IRQ when in master clock mode.
3259          *
3260          * Leave master clock mode enabled for IRQ test because the
3261          * timer IRQ used by the test can only happen in master clock mode.
3262          */
3263         if (!info->testing_irq)
3264                 clear_reg_bits(info, CHA + CCR0, BIT6);
3265
3266         tx_set_idle(info);
3267
3268         tx_stop(info);
3269         rx_stop(info);
3270 }
3271
3272 static void rx_stop(MGSLPC_INFO *info)
3273 {
3274         if (debug_level >= DEBUG_LEVEL_ISR)
3275                 printk("%s(%d):rx_stop(%s)\n",
3276                          __FILE__,__LINE__, info->device_name );
3277
3278         /* MODE:03 RAC Receiver Active, 0=inactive */
3279         clear_reg_bits(info, CHA + MODE, BIT3);
3280
3281         info->rx_enabled = false;
3282         info->rx_overflow = false;
3283 }
3284
3285 static void rx_start(MGSLPC_INFO *info)
3286 {
3287         if (debug_level >= DEBUG_LEVEL_ISR)
3288                 printk("%s(%d):rx_start(%s)\n",
3289                          __FILE__,__LINE__, info->device_name );
3290
3291         rx_reset_buffers(info);
3292         info->rx_enabled = false;
3293         info->rx_overflow = false;
3294
3295         /* MODE:03 RAC Receiver Active, 1=active */
3296         set_reg_bits(info, CHA + MODE, BIT3);
3297
3298         info->rx_enabled = true;
3299 }
3300
3301 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3302 {
3303         if (debug_level >= DEBUG_LEVEL_ISR)
3304                 printk("%s(%d):tx_start(%s)\n",
3305                          __FILE__,__LINE__, info->device_name );
3306
3307         if (info->tx_count) {
3308                 /* If auto RTS enabled and RTS is inactive, then assert */
3309                 /* RTS and set a flag indicating that the driver should */
3310                 /* negate RTS when the transmission completes. */
3311                 info->drop_rts_on_tx_done = false;
3312
3313                 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3314                         get_signals(info);
3315                         if (!(info->serial_signals & SerialSignal_RTS)) {
3316                                 info->serial_signals |= SerialSignal_RTS;
3317                                 set_signals(info);
3318                                 info->drop_rts_on_tx_done = true;
3319                         }
3320                 }
3321
3322                 if (info->params.mode == MGSL_MODE_ASYNC) {
3323                         if (!info->tx_active) {
3324                                 info->tx_active = true;
3325                                 tx_ready(info, tty);
3326                         }
3327                 } else {
3328                         info->tx_active = true;
3329                         tx_ready(info, tty);
3330                         mod_timer(&info->tx_timer, jiffies +
3331                                         msecs_to_jiffies(5000));
3332                 }
3333         }
3334
3335         if (!info->tx_enabled)
3336                 info->tx_enabled = true;
3337 }
3338
3339 static void tx_stop(MGSLPC_INFO *info)
3340 {
3341         if (debug_level >= DEBUG_LEVEL_ISR)
3342                 printk("%s(%d):tx_stop(%s)\n",
3343                          __FILE__,__LINE__, info->device_name );
3344
3345         del_timer(&info->tx_timer);
3346
3347         info->tx_enabled = false;
3348         info->tx_active = false;
3349 }
3350
3351 /* Reset the adapter to a known state and prepare it for further use.
3352  */
3353 static void reset_device(MGSLPC_INFO *info)
3354 {
3355         /* power up both channels (set BIT7) */
3356         write_reg(info, CHA + CCR0, 0x80);
3357         write_reg(info, CHB + CCR0, 0x80);
3358         write_reg(info, CHA + MODE, 0);
3359         write_reg(info, CHB + MODE, 0);
3360
3361         /* disable all interrupts */
3362         irq_disable(info, CHA, 0xffff);
3363         irq_disable(info, CHB, 0xffff);
3364         port_irq_disable(info, 0xff);
3365
3366         /* PCR Port Configuration Register
3367          *
3368          * 07..04  DEC[3..0] Serial I/F select outputs
3369          * 03      output, 1=AUTO CTS control enabled
3370          * 02      RI Ring Indicator input 0=active
3371          * 01      DSR input 0=active
3372          * 00      DTR output 0=active
3373          *
3374          * 0000 0110
3375          */
3376         write_reg(info, PCR, 0x06);
3377
3378         /* PVR Port Value Register
3379          *
3380          * 07..04  DEC[3..0] Serial I/F select (0000=disabled)
3381          * 03      AUTO CTS output 1=enabled
3382          * 02      RI Ring Indicator input
3383          * 01      DSR input
3384          * 00      DTR output (1=inactive)
3385          *
3386          * 0000 0001
3387          */
3388 //      write_reg(info, PVR, PVR_DTR);
3389
3390         /* IPC Interrupt Port Configuration
3391          *
3392          * 07      VIS 1=Masked interrupts visible
3393          * 06..05  Reserved, 0
3394          * 04..03  SLA Slave address, 00 ignored
3395          * 02      CASM Cascading Mode, 1=daisy chain
3396          * 01..00  IC[1..0] Interrupt Config, 01=push-pull output, active low
3397          *
3398          * 0000 0101
3399          */
3400         write_reg(info, IPC, 0x05);
3401 }
3402
3403 static void async_mode(MGSLPC_INFO *info)
3404 {
3405         unsigned char val;
3406
3407         /* disable all interrupts */
3408         irq_disable(info, CHA, 0xffff);
3409         irq_disable(info, CHB, 0xffff);
3410         port_irq_disable(info, 0xff);
3411
3412         /* MODE
3413          *
3414          * 07      Reserved, 0
3415          * 06      FRTS RTS State, 0=active
3416          * 05      FCTS Flow Control on CTS
3417          * 04      FLON Flow Control Enable
3418          * 03      RAC Receiver Active, 0 = inactive
3419          * 02      RTS 0=Auto RTS, 1=manual RTS
3420          * 01      TRS Timer Resolution, 1=512
3421          * 00      TLP Test Loop, 0 = no loop
3422          *
3423          * 0000 0110
3424          */
3425         val = 0x06;
3426         if (info->params.loopback)
3427                 val |= BIT0;
3428
3429         /* preserve RTS state */
3430         if (!(info->serial_signals & SerialSignal_RTS))
3431                 val |= BIT6;
3432         write_reg(info, CHA + MODE, val);
3433
3434         /* CCR0
3435          *
3436          * 07      PU Power Up, 1=active, 0=power down
3437          * 06      MCE Master Clock Enable, 1=enabled
3438          * 05      Reserved, 0
3439          * 04..02  SC[2..0] Encoding, 000=NRZ
3440          * 01..00  SM[1..0] Serial Mode, 11=Async
3441          *
3442          * 1000 0011
3443          */
3444         write_reg(info, CHA + CCR0, 0x83);
3445
3446         /* CCR1
3447          *
3448          * 07..05  Reserved, 0
3449          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3450          * 03      BCR Bit Clock Rate, 1=16x
3451          * 02..00  CM[2..0] Clock Mode, 111=BRG
3452          *
3453          * 0001 1111
3454          */
3455         write_reg(info, CHA + CCR1, 0x1f);
3456
3457         /* CCR2 (channel A)
3458          *
3459          * 07..06  BGR[9..8] Baud rate bits 9..8
3460          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3461          * 04      SSEL Clock source select, 1=submode b
3462          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3463          * 02      RWX Read/Write Exchange 0=disabled
3464          * 01      Reserved, 0
3465          * 00      DIV, data inversion 0=disabled, 1=enabled
3466          *
3467          * 0001 0000
3468          */
3469         write_reg(info, CHA + CCR2, 0x10);
3470
3471         /* CCR3
3472          *
3473          * 07..01  Reserved, 0
3474          * 00      PSD DPLL Phase Shift Disable
3475          *
3476          * 0000 0000
3477          */
3478         write_reg(info, CHA + CCR3, 0);
3479
3480         /* CCR4
3481          *
3482          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3483          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3484          * 05      TST1 Test Pin, 0=normal operation
3485          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3486          * 03..00  Reserved, must be 0
3487          *
3488          * 0101 0000
3489          */
3490         write_reg(info, CHA + CCR4, 0x50);
3491         mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3492
3493         /* DAFO Data Format
3494          *
3495          * 07      Reserved, 0
3496          * 06      XBRK transmit break, 0=normal operation
3497          * 05      Stop bits (0=1, 1=2)
3498          * 04..03  PAR[1..0] Parity (01=odd, 10=even)
3499          * 02      PAREN Parity Enable
3500          * 01..00  CHL[1..0] Character Length (00=8, 01=7)
3501          *
3502          */
3503         val = 0x00;
3504         if (info->params.data_bits != 8)
3505                 val |= BIT0;    /* 7 bits */
3506         if (info->params.stop_bits != 1)
3507                 val |= BIT5;
3508         if (info->params.parity != ASYNC_PARITY_NONE)
3509         {
3510                 val |= BIT2;    /* Parity enable */
3511                 if (info->params.parity == ASYNC_PARITY_ODD)
3512                         val |= BIT3;
3513                 else
3514                         val |= BIT4;
3515         }
3516         write_reg(info, CHA + DAFO, val);
3517
3518         /* RFC Rx FIFO Control
3519          *
3520          * 07      Reserved, 0
3521          * 06      DPS, 1=parity bit not stored in data byte
3522          * 05      DXS, 0=all data stored in FIFO (including XON/XOFF)
3523          * 04      RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3524          * 03..02  RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3525          * 01      Reserved, 0
3526          * 00      TCDE Terminate Char Detect Enable, 0=disabled
3527          *
3528          * 0101 1100
3529          */
3530         write_reg(info, CHA + RFC, 0x5c);
3531
3532         /* RLCR Receive length check register
3533          *
3534          * Max frame length = (RL + 1) * 32
3535          */
3536         write_reg(info, CHA + RLCR, 0);
3537
3538         /* XBCH Transmit Byte Count High
3539          *
3540          * 07      DMA mode, 0 = interrupt driven
3541          * 06      NRM, 0=ABM (ignored)
3542          * 05      CAS Carrier Auto Start
3543          * 04      XC Transmit Continuously (ignored)
3544          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3545          *
3546          * 0000 0000
3547          */
3548         val = 0x00;
3549         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3550                 val |= BIT5;
3551         write_reg(info, CHA + XBCH, val);
3552         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3553                 irq_enable(info, CHA, IRQ_CTS);
3554
3555         /* MODE:03 RAC Receiver Active, 1=active */
3556         set_reg_bits(info, CHA + MODE, BIT3);
3557         enable_auxclk(info);
3558         if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3559                 irq_enable(info, CHB, IRQ_CTS);
3560                 /* PVR[3] 1=AUTO CTS active */
3561                 set_reg_bits(info, CHA + PVR, BIT3);
3562         } else
3563                 clear_reg_bits(info, CHA + PVR, BIT3);
3564         irq_enable(info, CHA,
3565                           IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3566                           IRQ_ALLSENT + IRQ_TXFIFO);
3567         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3568         wait_command_complete(info, CHA);
3569         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3570 }
3571
3572 /* Set the HDLC idle mode for the transmitter.
3573  */
3574 static void tx_set_idle(MGSLPC_INFO *info)
3575 {
3576         /* Note: ESCC2 only supports flags and one idle modes */
3577         if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3578                 set_reg_bits(info, CHA + CCR1, BIT3);
3579         else
3580                 clear_reg_bits(info, CHA + CCR1, BIT3);
3581 }
3582
3583 /* get state of the V24 status (input) signals.
3584  */
3585 static void get_signals(MGSLPC_INFO *info)
3586 {
3587         unsigned char status = 0;
3588
3589         /* preserve DTR and RTS */
3590         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3591
3592         if (read_reg(info, CHB + VSTR) & BIT7)
3593                 info->serial_signals |= SerialSignal_DCD;
3594         if (read_reg(info, CHB + STAR) & BIT1)
3595                 info->serial_signals |= SerialSignal_CTS;
3596
3597         status = read_reg(info, CHA + PVR);
3598         if (!(status & PVR_RI))
3599                 info->serial_signals |= SerialSignal_RI;
3600         if (!(status & PVR_DSR))
3601                 info->serial_signals |= SerialSignal_DSR;
3602 }
3603
3604 /* Set the state of DTR and RTS based on contents of
3605  * serial_signals member of device extension.
3606  */
3607 static void set_signals(MGSLPC_INFO *info)
3608 {
3609         unsigned char val;
3610
3611         val = read_reg(info, CHA + MODE);
3612         if (info->params.mode == MGSL_MODE_ASYNC) {
3613                 if (info->serial_signals & SerialSignal_RTS)
3614                         val &= ~BIT6;
3615                 else
3616                         val |= BIT6;
3617         } else {
3618                 if (info->serial_signals & SerialSignal_RTS)
3619                         val |= BIT2;
3620                 else
3621                         val &= ~BIT2;
3622         }
3623         write_reg(info, CHA + MODE, val);
3624
3625         if (info->serial_signals & SerialSignal_DTR)
3626                 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3627         else
3628                 set_reg_bits(info, CHA + PVR, PVR_DTR);
3629 }
3630
3631 static void rx_reset_buffers(MGSLPC_INFO *info)
3632 {
3633         RXBUF *buf;
3634         int i;
3635
3636         info->rx_put = 0;
3637         info->rx_get = 0;
3638         info->rx_frame_count = 0;
3639         for (i=0 ; i < info->rx_buf_count ; i++) {
3640                 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3641                 buf->status = buf->count = 0;
3642         }
3643 }
3644
3645 /* Attempt to return a received HDLC frame
3646  * Only frames received without errors are returned.
3647  *
3648  * Returns true if frame returned, otherwise false
3649  */
3650 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3651 {
3652         unsigned short status;
3653         RXBUF *buf;
3654         unsigned int framesize = 0;
3655         unsigned long flags;
3656         bool return_frame = false;
3657
3658         if (info->rx_frame_count == 0)
3659                 return false;
3660
3661         buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3662
3663         status = buf->status;
3664
3665         /* 07  VFR  1=valid frame
3666          * 06  RDO  1=data overrun
3667          * 05  CRC  1=OK, 0=error
3668          * 04  RAB  1=frame aborted
3669          */
3670         if ((status & 0xf0) != 0xA0) {
3671                 if (!(status & BIT7) || (status & BIT4))
3672                         info->icount.rxabort++;
3673                 else if (status & BIT6)
3674                         info->icount.rxover++;
3675                 else if (!(status & BIT5)) {
3676                         info->icount.rxcrc++;
3677                         if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3678                                 return_frame = true;
3679                 }
3680                 framesize = 0;
3681 #if SYNCLINK_GENERIC_HDLC
3682                 {
3683                         info->netdev->stats.rx_errors++;
3684                         info->netdev->stats.rx_frame_errors++;
3685                 }
3686 #endif
3687         } else
3688                 return_frame = true;
3689
3690         if (return_frame)
3691                 framesize = buf->count;
3692
3693         if (debug_level >= DEBUG_LEVEL_BH)
3694                 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3695                         __FILE__,__LINE__,info->device_name,status,framesize);
3696
3697         if (debug_level >= DEBUG_LEVEL_DATA)
3698                 trace_block(info, buf->data, framesize, 0);
3699
3700         if (framesize) {
3701                 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3702                       framesize+1 > info->max_frame_size) ||
3703                     framesize > info->max_frame_size)
3704                         info->icount.rxlong++;
3705                 else {
3706                         if (status & BIT5)
3707                                 info->icount.rxok++;
3708
3709                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3710                                 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3711                                 ++framesize;
3712                         }
3713
3714 #if SYNCLINK_GENERIC_HDLC
3715                         if (info->netcount)
3716                                 hdlcdev_rx(info, buf->data, framesize);
3717                         else
3718 #endif
3719                                 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3720                 }
3721         }
3722
3723         spin_lock_irqsave(&info->lock,flags);
3724         buf->status = buf->count = 0;
3725         info->rx_frame_count--;
3726         info->rx_get++;
3727         if (info->rx_get >= info->rx_buf_count)
3728                 info->rx_get = 0;
3729         spin_unlock_irqrestore(&info->lock,flags);
3730
3731         return true;
3732 }
3733
3734 static bool register_test(MGSLPC_INFO *info)
3735 {
3736         static unsigned char patterns[] =
3737             { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3738         static unsigned int count = ARRAY_SIZE(patterns);
3739         unsigned int i;
3740         bool rc = true;
3741         unsigned long flags;
3742
3743         spin_lock_irqsave(&info->lock,flags);
3744         reset_device(info);
3745
3746         for (i = 0; i < count; i++) {
3747                 write_reg(info, XAD1, patterns[i]);
3748                 write_reg(info, XAD2, patterns[(i + 1) % count]);
3749                 if ((read_reg(info, XAD1) != patterns[i]) ||
3750                     (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3751                         rc = false;
3752                         break;
3753                 }
3754         }
3755
3756         spin_unlock_irqrestore(&info->lock,flags);
3757         return rc;
3758 }
3759
3760 static bool irq_test(MGSLPC_INFO *info)
3761 {
3762         unsigned long end_time;
3763         unsigned long flags;
3764
3765         spin_lock_irqsave(&info->lock,flags);
3766         reset_device(info);
3767
3768         info->testing_irq = true;
3769         hdlc_mode(info);
3770
3771         info->irq_occurred = false;
3772
3773         /* init hdlc mode */
3774
3775         irq_enable(info, CHA, IRQ_TIMER);
3776         write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3777         issue_command(info, CHA, CMD_START_TIMER);
3778
3779         spin_unlock_irqrestore(&info->lock,flags);
3780
3781         end_time=100;
3782         while(end_time-- && !info->irq_occurred) {
3783                 msleep_interruptible(10);
3784         }
3785
3786         info->testing_irq = false;
3787
3788         spin_lock_irqsave(&info->lock,flags);
3789         reset_device(info);
3790         spin_unlock_irqrestore(&info->lock,flags);
3791
3792         return info->irq_occurred;
3793 }
3794
3795 static int adapter_test(MGSLPC_INFO *info)
3796 {
3797         if (!register_test(info)) {
3798                 info->init_error = DiagStatus_AddressFailure;
3799                 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
3800                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
3801                 return -ENODEV;
3802         }
3803
3804         if (!irq_test(info)) {
3805                 info->init_error = DiagStatus_IrqFailure;
3806                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3807                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
3808                 return -ENODEV;
3809         }
3810
3811         if (debug_level >= DEBUG_LEVEL_INFO)
3812                 printk("%s(%d):device %s passed diagnostics\n",
3813                         __FILE__,__LINE__,info->device_name);
3814         return 0;
3815 }
3816
3817 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3818 {
3819         int i;
3820         int linecount;
3821         if (xmit)
3822                 printk("%s tx data:\n",info->device_name);
3823         else
3824                 printk("%s rx data:\n",info->device_name);
3825
3826         while(count) {
3827                 if (count > 16)
3828                         linecount = 16;
3829                 else
3830                         linecount = count;
3831
3832                 for(i=0;i<linecount;i++)
3833                         printk("%02X ",(unsigned char)data[i]);
3834                 for(;i<17;i++)
3835                         printk("   ");
3836                 for(i=0;i<linecount;i++) {
3837                         if (data[i]>=040 && data[i]<=0176)
3838                                 printk("%c",data[i]);
3839                         else
3840                                 printk(".");
3841                 }
3842                 printk("\n");
3843
3844                 data  += linecount;
3845                 count -= linecount;
3846         }
3847 }
3848
3849 /* HDLC frame time out
3850  * update stats and do tx completion processing
3851  */
3852 static void tx_timeout(unsigned long context)
3853 {
3854         MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3855         unsigned long flags;
3856
3857         if ( debug_level >= DEBUG_LEVEL_INFO )
3858                 printk( "%s(%d):tx_timeout(%s)\n",
3859                         __FILE__,__LINE__,info->device_name);
3860         if(info->tx_active &&
3861            info->params.mode == MGSL_MODE_HDLC) {
3862                 info->icount.txtimeout++;
3863         }
3864         spin_lock_irqsave(&info->lock,flags);
3865         info->tx_active = false;
3866         info->tx_count = info->tx_put = info->tx_get = 0;
3867
3868         spin_unlock_irqrestore(&info->lock,flags);
3869
3870 #if SYNCLINK_GENERIC_HDLC
3871         if (info->netcount)
3872                 hdlcdev_tx_done(info);
3873         else
3874 #endif
3875         {
3876                 struct tty_struct *tty = tty_port_tty_get(&info->port);
3877                 bh_transmit(info, tty);
3878                 tty_kref_put(tty);
3879         }
3880 }
3881
3882 #if SYNCLINK_GENERIC_HDLC
3883
3884 /**
3885  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3886  * set encoding and frame check sequence (FCS) options
3887  *
3888  * dev       pointer to network device structure
3889  * encoding  serial encoding setting
3890  * parity    FCS setting
3891  *
3892  * returns 0 if success, otherwise error code
3893  */
3894 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3895                           unsigned short parity)
3896 {
3897         MGSLPC_INFO *info = dev_to_port(dev);
3898         struct tty_struct *tty;
3899         unsigned char  new_encoding;
3900         unsigned short new_crctype;
3901
3902         /* return error if TTY interface open */
3903         if (info->port.count)
3904                 return -EBUSY;
3905
3906         switch (encoding)
3907         {
3908         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
3909         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3910         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3911         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3912         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3913         default: return -EINVAL;
3914         }
3915
3916         switch (parity)
3917         {
3918         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
3919         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3920         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3921         default: return -EINVAL;
3922         }
3923
3924         info->params.encoding = new_encoding;
3925         info->params.crc_type = new_crctype;
3926
3927         /* if network interface up, reprogram hardware */
3928         if (info->netcount) {
3929                 tty = tty_port_tty_get(&info->port);
3930                 mgslpc_program_hw(info, tty);
3931                 tty_kref_put(tty);
3932         }
3933
3934         return 0;
3935 }
3936
3937 /**
3938  * called by generic HDLC layer to send frame
3939  *
3940  * skb  socket buffer containing HDLC frame
3941  * dev  pointer to network device structure
3942  */
3943 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3944                                       struct net_device *dev)
3945 {
3946         MGSLPC_INFO *info = dev_to_port(dev);
3947         unsigned long flags;
3948
3949         if (debug_level >= DEBUG_LEVEL_INFO)
3950                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
3951
3952         /* stop sending until this frame completes */
3953         netif_stop_queue(dev);
3954
3955         /* copy data to device buffers */
3956         skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3957         info->tx_get = 0;
3958         info->tx_put = info->tx_count = skb->len;
3959
3960         /* update network statistics */
3961         dev->stats.tx_packets++;
3962         dev->stats.tx_bytes += skb->len;
3963
3964         /* done with socket buffer, so free it */
3965         dev_kfree_skb(skb);
3966
3967         /* save start time for transmit timeout detection */
3968         dev->trans_start = jiffies;
3969
3970         /* start hardware transmitter if necessary */
3971         spin_lock_irqsave(&info->lock,flags);
3972         if (!info->tx_active) {
3973                 struct tty_struct *tty = tty_port_tty_get(&info->port);
3974                 tx_start(info, tty);
3975                 tty_kref_put(tty);
3976         }
3977         spin_unlock_irqrestore(&info->lock,flags);
3978
3979         return NETDEV_TX_OK;
3980 }
3981
3982 /**
3983  * called by network layer when interface enabled
3984  * claim resources and initialize hardware
3985  *
3986  * dev  pointer to network device structure
3987  *
3988  * returns 0 if success, otherwise error code
3989  */
3990 static int hdlcdev_open(struct net_device *dev)
3991 {
3992         MGSLPC_INFO *info = dev_to_port(dev);
3993         struct tty_struct *tty;
3994         int rc;
3995         unsigned long flags;
3996
3997         if (debug_level >= DEBUG_LEVEL_INFO)
3998                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
3999
4000         /* generic HDLC layer open processing */
4001         if ((rc = hdlc_open(dev)))
4002                 return rc;
4003
4004         /* arbitrate between network and tty opens */
4005         spin_lock_irqsave(&info->netlock, flags);
4006         if (info->port.count != 0 || info->netcount != 0) {
4007                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4008                 spin_unlock_irqrestore(&info->netlock, flags);
4009                 return -EBUSY;
4010         }
4011         info->netcount=1;
4012         spin_unlock_irqrestore(&info->netlock, flags);
4013
4014         tty = tty_port_tty_get(&info->port);
4015         /* claim resources and init adapter */
4016         if ((rc = startup(info, tty)) != 0) {
4017                 tty_kref_put(tty);
4018                 spin_lock_irqsave(&info->netlock, flags);
4019                 info->netcount=0;
4020                 spin_unlock_irqrestore(&info->netlock, flags);
4021                 return rc;
4022         }
4023         /* assert DTR and RTS, apply hardware settings */
4024         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4025         mgslpc_program_hw(info, tty);
4026         tty_kref_put(tty);
4027
4028         /* enable network layer transmit */
4029         dev->trans_start = jiffies;
4030         netif_start_queue(dev);
4031
4032         /* inform generic HDLC layer of current DCD status */
4033         spin_lock_irqsave(&info->lock, flags);
4034         get_signals(info);
4035         spin_unlock_irqrestore(&info->lock, flags);
4036         if (info->serial_signals & SerialSignal_DCD)
4037                 netif_carrier_on(dev);
4038         else
4039                 netif_carrier_off(dev);
4040         return 0;
4041 }
4042
4043 /**
4044  * called by network layer when interface is disabled
4045  * shutdown hardware and release resources
4046  *
4047  * dev  pointer to network device structure
4048  *
4049  * returns 0 if success, otherwise error code
4050  */
4051 static int hdlcdev_close(struct net_device *dev)
4052 {
4053         MGSLPC_INFO *info = dev_to_port(dev);
4054         struct tty_struct *tty = tty_port_tty_get(&info->port);
4055         unsigned long flags;
4056
4057         if (debug_level >= DEBUG_LEVEL_INFO)
4058                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4059
4060         netif_stop_queue(dev);
4061
4062         /* shutdown adapter and release resources */
4063         shutdown(info, tty);
4064         tty_kref_put(tty);
4065         hdlc_close(dev);
4066
4067         spin_lock_irqsave(&info->netlock, flags);
4068         info->netcount=0;
4069         spin_unlock_irqrestore(&info->netlock, flags);
4070
4071         return 0;
4072 }
4073
4074 /**
4075  * called by network layer to process IOCTL call to network device
4076  *
4077  * dev  pointer to network device structure
4078  * ifr  pointer to network interface request structure
4079  * cmd  IOCTL command code
4080  *
4081  * returns 0 if success, otherwise error code
4082  */
4083 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4084 {
4085         const size_t size = sizeof(sync_serial_settings);
4086         sync_serial_settings new_line;
4087         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4088         MGSLPC_INFO *info = dev_to_port(dev);
4089         unsigned int flags;
4090
4091         if (debug_level >= DEBUG_LEVEL_INFO)
4092                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4093
4094         /* return error if TTY interface open */
4095         if (info->port.count)
4096                 return -EBUSY;
4097
4098         if (cmd != SIOCWANDEV)
4099                 return hdlc_ioctl(dev, ifr, cmd);
4100
4101         memset(&new_line, 0, size);
4102
4103         switch(ifr->ifr_settings.type) {
4104         case IF_GET_IFACE: /* return current sync_serial_settings */
4105
4106                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4107                 if (ifr->ifr_settings.size < size) {
4108                         ifr->ifr_settings.size = size; /* data size wanted */
4109                         return -ENOBUFS;
4110                 }
4111
4112                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4113                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4114                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4115                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4116
4117                 switch (flags){
4118                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4119                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
4120                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
4121                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4122                 default: new_line.clock_type = CLOCK_DEFAULT;
4123                 }
4124
4125                 new_line.clock_rate = info->params.clock_speed;
4126                 new_line.loopback   = info->params.loopback ? 1:0;
4127
4128                 if (copy_to_user(line, &new_line, size))
4129                         return -EFAULT;
4130                 return 0;
4131
4132         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4133
4134                 if(!capable(CAP_NET_ADMIN))
4135                         return -EPERM;
4136                 if (copy_from_user(&new_line, line, size))
4137                         return -EFAULT;
4138
4139                 switch (new_line.clock_type)
4140                 {
4141                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4142                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4143                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
4144                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
4145                 case CLOCK_DEFAULT:  flags = info->params.flags &
4146                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4147                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4148                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4149                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
4150                 default: return -EINVAL;
4151                 }
4152
4153                 if (new_line.loopback != 0 && new_line.loopback != 1)
4154                         return -EINVAL;
4155
4156                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4157                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4158                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4159                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4160                 info->params.flags |= flags;
4161
4162                 info->params.loopback = new_line.loopback;
4163
4164                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4165                         info->params.clock_speed = new_line.clock_rate;
4166                 else
4167                         info->params.clock_speed = 0;
4168
4169                 /* if network interface up, reprogram hardware */
4170                 if (info->netcount) {
4171                         struct tty_struct *tty = tty_port_tty_get(&info->port);
4172                         mgslpc_program_hw(info, tty);
4173                         tty_kref_put(tty);
4174                 }
4175                 return 0;
4176
4177         default:
4178                 return hdlc_ioctl(dev, ifr, cmd);
4179         }
4180 }
4181
4182 /**
4183  * called by network layer when transmit timeout is detected
4184  *
4185  * dev  pointer to network device structure
4186  */
4187 static void hdlcdev_tx_timeout(struct net_device *dev)
4188 {
4189         MGSLPC_INFO *info = dev_to_port(dev);
4190         unsigned long flags;
4191
4192         if (debug_level >= DEBUG_LEVEL_INFO)
4193                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4194
4195         dev->stats.tx_errors++;
4196         dev->stats.tx_aborted_errors++;
4197
4198         spin_lock_irqsave(&info->lock,flags);
4199         tx_stop(info);
4200         spin_unlock_irqrestore(&info->lock,flags);
4201
4202         netif_wake_queue(dev);
4203 }
4204
4205 /**
4206  * called by device driver when transmit completes
4207  * reenable network layer transmit if stopped
4208  *
4209  * info  pointer to device instance information
4210  */
4211 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4212 {
4213         if (netif_queue_stopped(info->netdev))
4214                 netif_wake_queue(info->netdev);
4215 }
4216
4217 /**
4218  * called by device driver when frame received
4219  * pass frame to network layer
4220  *
4221  * info  pointer to device instance information
4222  * buf   pointer to buffer contianing frame data
4223  * size  count of data bytes in buf
4224  */
4225 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4226 {
4227         struct sk_buff *skb = dev_alloc_skb(size);
4228         struct net_device *dev = info->netdev;
4229
4230         if (debug_level >= DEBUG_LEVEL_INFO)
4231                 printk("hdlcdev_rx(%s)\n",dev->name);
4232
4233         if (skb == NULL) {
4234                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4235                 dev->stats.rx_dropped++;
4236                 return;
4237         }
4238
4239         memcpy(skb_put(skb, size), buf, size);
4240
4241         skb->protocol = hdlc_type_trans(skb, dev);
4242
4243         dev->stats.rx_packets++;
4244         dev->stats.rx_bytes += size;
4245
4246         netif_rx(skb);
4247 }
4248
4249 static const struct net_device_ops hdlcdev_ops = {
4250         .ndo_open       = hdlcdev_open,
4251         .ndo_stop       = hdlcdev_close,
4252         .ndo_change_mtu = hdlc_change_mtu,
4253         .ndo_start_xmit = hdlc_start_xmit,
4254         .ndo_do_ioctl   = hdlcdev_ioctl,
4255         .ndo_tx_timeout = hdlcdev_tx_timeout,
4256 };
4257
4258 /**
4259  * called by device driver when adding device instance
4260  * do generic HDLC initialization
4261  *
4262  * info  pointer to device instance information
4263  *
4264  * returns 0 if success, otherwise error code
4265  */
4266 static int hdlcdev_init(MGSLPC_INFO *info)
4267 {
4268         int rc;
4269         struct net_device *dev;
4270         hdlc_device *hdlc;
4271
4272         /* allocate and initialize network and HDLC layer objects */
4273
4274         if (!(dev = alloc_hdlcdev(info))) {
4275                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4276                 return -ENOMEM;
4277         }
4278
4279         /* for network layer reporting purposes only */
4280         dev->base_addr = info->io_base;
4281         dev->irq       = info->irq_level;
4282
4283         /* network layer callbacks and settings */
4284         dev->netdev_ops     = &hdlcdev_ops;
4285         dev->watchdog_timeo = 10 * HZ;
4286         dev->tx_queue_len   = 50;
4287
4288         /* generic HDLC layer callbacks and settings */
4289         hdlc         = dev_to_hdlc(dev);
4290         hdlc->attach = hdlcdev_attach;
4291         hdlc->xmit   = hdlcdev_xmit;
4292
4293         /* register objects with HDLC layer */
4294         if ((rc = register_hdlc_device(dev))) {
4295                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4296                 free_netdev(dev);
4297                 return rc;
4298         }
4299
4300         info->netdev = dev;
4301         return 0;
4302 }
4303
4304 /**
4305  * called by device driver when removing device instance
4306  * do generic HDLC cleanup
4307  *
4308  * info  pointer to device instance information
4309  */
4310 static void hdlcdev_exit(MGSLPC_INFO *info)
4311 {
4312         unregister_hdlc_device(info->netdev);
4313         free_netdev(info->netdev);
4314         info->netdev = NULL;
4315 }
4316
4317 #endif /* CONFIG_HDLC */
4318