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   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/slab.h>
  55 #include <linux/netdevice.h>
  56 #include <linux/vmalloc.h>
  57 #include <linux/init.h>
  58 #include <linux/delay.h>
  59 #include <linux/ioctl.h>
  60 #include <linux/synclink.h>
  61
  62 #include <asm/system.h>
  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/cs_types.h>
  73 #include <pcmcia/cs.h>
  74 #include <pcmcia/cistpl.h>
  75 #include <pcmcia/cisreg.h>
  76 #include <pcmcia/ds.h>
  77
  78 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
  79 #define SYNCLINK_GENERIC_HDLC 1
  80 #else
  81 #define SYNCLINK_GENERIC_HDLC 0
  82 #endif
  83
  84 #define GET_USER(error,value,addr) error = get_user(value,addr)
  85 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  86 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  87 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  88
  89 #include <asm/uaccess.h>
  90
  91 static MGSL_PARAMS default_params = {
  92         MGSL_MODE_HDLC,                 /* unsigned long mode */
  93         0,                              /* unsigned char loopback; */
  94         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  95         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  96         0,                              /* unsigned long clock_speed; */
  97         0xff,                           /* unsigned char addr_filter; */
  98         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  99         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
 100         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
 101         9600,                           /* unsigned long data_rate; */
 102         8,                              /* unsigned char data_bits; */
 103         1,                              /* unsigned char stop_bits; */
 104         ASYNC_PARITY_NONE               /* unsigned char parity; */
 105 };
 106
 107 typedef struct
 108 {
 109         int count;
 110         unsigned char status;
 111         char data[1];
 112 } RXBUF;
 113
 114 /* The queue of BH actions to be performed */
 115
 116 #define BH_RECEIVE  1
 117 #define BH_TRANSMIT 2
 118 #define BH_STATUS   4
 119
 120 #define IO_PIN_SHUTDOWN_LIMIT 100
 121
 122 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 123
 124 struct _input_signal_events {
 125         int     ri_up;
 126         int     ri_down;
 127         int     dsr_up;
 128         int     dsr_down;
 129         int     dcd_up;
 130         int     dcd_down;
 131         int     cts_up;
 132         int     cts_down;
 133 };
 134
 135
 136 /*
 137  * Device instance data structure
 138  */
 139
 140 typedef struct _mgslpc_info {
 141         void *if_ptr;   /* General purpose pointer (used by SPPP) */
 142         int                     magic;
 143         int                     flags;
 144         int                     count;          /* count of opens */
 145         int                     line;
 146         unsigned short          close_delay;
 147         unsigned short          closing_wait;   /* time to wait before closing */
 148
 149         struct mgsl_icount      icount;
 150
 151         struct tty_struct       *tty;
 152         int                     timeout;
 153         int                     x_char;         /* xon/xoff character */
 154         int                     blocked_open;   /* # of blocked opens */
 155         unsigned char           read_status_mask;
 156         unsigned char           ignore_status_mask;
 157
 158         unsigned char *tx_buf;
 159         int            tx_put;
 160         int            tx_get;
 161         int            tx_count;
 162
 163         /* circular list of fixed length rx buffers */
 164
 165         unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
 166         int            rx_buf_total_size; /* size of memory allocated for rx buffers */
 167         int            rx_put;         /* index of next empty rx buffer */
 168         int            rx_get;         /* index of next full rx buffer */
 169         int            rx_buf_size;    /* size in bytes of single rx buffer */
 170         int            rx_buf_count;   /* total number of rx buffers */
 171         int            rx_frame_count; /* number of full rx buffers */
 172
 173         wait_queue_head_t       open_wait;
 174         wait_queue_head_t       close_wait;
 175
 176         wait_queue_head_t       status_event_wait_q;
 177         wait_queue_head_t       event_wait_q;
 178         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 179         struct _mgslpc_info     *next_device;   /* device list link */
 180
 181         unsigned short imra_value;
 182         unsigned short imrb_value;
 183         unsigned char  pim_value;
 184
 185         spinlock_t lock;
 186         struct work_struct task;                /* task structure for scheduling bh */
 187
 188         u32 max_frame_size;
 189
 190         u32 pending_bh;
 191
 192         bool bh_running;
 193         bool bh_requested;
 194
 195         int dcd_chkcount; /* check counts to prevent */
 196         int cts_chkcount; /* too many IRQs if a signal */
 197         int dsr_chkcount; /* is floating */
 198         int ri_chkcount;
 199
 200         bool rx_enabled;
 201         bool rx_overflow;
 202
 203         bool tx_enabled;
 204         bool tx_active;
 205         bool tx_aborting;
 206         u32 idle_mode;
 207
 208         int if_mode; /* serial interface selection (RS-232, v.35 etc) */
 209
 210         char device_name[25];           /* device instance name */
 211
 212         unsigned int io_base;   /* base I/O address of adapter */
 213         unsigned int irq_level;
 214
 215         MGSL_PARAMS params;             /* communications parameters */
 216
 217         unsigned char serial_signals;   /* current serial signal states */
 218
 219         bool irq_occurred;              /* for diagnostics use */
 220         char testing_irq;
 221         unsigned int init_error;        /* startup error (DIAGS)        */
 222
 223         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 224         bool drop_rts_on_tx_done;
 225
 226         struct  _input_signal_events    input_signal_events;
 227
 228         /* PCMCIA support */
 229         struct pcmcia_device    *p_dev;
 230         dev_node_t            node;
 231         int                   stop;
 232
 233         /* SPPP/Cisco HDLC device parts */
 234         int netcount;
 235         int dosyncppp;
 236         spinlock_t netlock;
 237
 238 #if SYNCLINK_GENERIC_HDLC
 239         struct net_device *netdev;
 240 #endif
 241
 242 } MGSLPC_INFO;
 243
 244 #define MGSLPC_MAGIC 0x5402
 245
 246 /*
 247  * The size of the serial xmit buffer is 1 page, or 4096 bytes
 248  */
 249 #define TXBUFSIZE 4096
 250
 251
 252 #define CHA     0x00   /* channel A offset */
 253 #define CHB     0x40   /* channel B offset */
 254
 255 /*
 256  *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
 257  */
 258 #undef PVR
 259
 260 #define RXFIFO  0
 261 #define TXFIFO  0
 262 #define STAR    0x20
 263 #define CMDR    0x20
 264 #define RSTA    0x21
 265 #define PRE     0x21
 266 #define MODE    0x22
 267 #define TIMR    0x23
 268 #define XAD1    0x24
 269 #define XAD2    0x25
 270 #define RAH1    0x26
 271 #define RAH2    0x27
 272 #define DAFO    0x27
 273 #define RAL1    0x28
 274 #define RFC     0x28
 275 #define RHCR    0x29
 276 #define RAL2    0x29
 277 #define RBCL    0x2a
 278 #define XBCL    0x2a
 279 #define RBCH    0x2b
 280 #define XBCH    0x2b
 281 #define CCR0    0x2c
 282 #define CCR1    0x2d
 283 #define CCR2    0x2e
 284 #define CCR3    0x2f
 285 #define VSTR    0x34
 286 #define BGR     0x34
 287 #define RLCR    0x35
 288 #define AML     0x36
 289 #define AMH     0x37
 290 #define GIS     0x38
 291 #define IVA     0x38
 292 #define IPC     0x39
 293 #define ISR     0x3a
 294 #define IMR     0x3a
 295 #define PVR     0x3c
 296 #define PIS     0x3d
 297 #define PIM     0x3d
 298 #define PCR     0x3e
 299 #define CCR4    0x3f
 300
 301 // IMR/ISR
 302
 303 #define IRQ_BREAK_ON    BIT15   // rx break detected
 304 #define IRQ_DATAOVERRUN BIT14   // receive data overflow
 305 #define IRQ_ALLSENT     BIT13   // all sent
 306 #define IRQ_UNDERRUN    BIT12   // transmit data underrun
 307 #define IRQ_TIMER       BIT11   // timer interrupt
 308 #define IRQ_CTS         BIT10   // CTS status change
 309 #define IRQ_TXREPEAT    BIT9    // tx message repeat
 310 #define IRQ_TXFIFO      BIT8    // transmit pool ready
 311 #define IRQ_RXEOM       BIT7    // receive message end
 312 #define IRQ_EXITHUNT    BIT6    // receive frame start
 313 #define IRQ_RXTIME      BIT6    // rx char timeout
 314 #define IRQ_DCD         BIT2    // carrier detect status change
 315 #define IRQ_OVERRUN     BIT1    // receive frame overflow
 316 #define IRQ_RXFIFO      BIT0    // receive pool full
 317
 318 // STAR
 319
 320 #define XFW   BIT6              // transmit FIFO write enable
 321 #define CEC   BIT2              // command executing
 322 #define CTS   BIT1              // CTS state
 323
 324 #define PVR_DTR      BIT0
 325 #define PVR_DSR      BIT1
 326 #define PVR_RI       BIT2
 327 #define PVR_AUTOCTS  BIT3
 328 #define PVR_RS232    0x20   /* 0010b */
 329 #define PVR_V35      0xe0   /* 1110b */
 330 #define PVR_RS422    0x40   /* 0100b */
 331
 332 /* Register access functions */
 333
 334 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
 335 #define read_reg(info, reg) inb((info)->io_base + (reg))
 336
 337 #define read_reg16(info, reg) inw((info)->io_base + (reg))
 338 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
 339
 340 #define set_reg_bits(info, reg, mask) \
 341     write_reg(info, (reg), \
 342                  (unsigned char) (read_reg(info, (reg)) | (mask)))
 343 #define clear_reg_bits(info, reg, mask) \
 344     write_reg(info, (reg), \
 345                  (unsigned char) (read_reg(info, (reg)) & ~(mask)))
 346 /*
 347  * interrupt enable/disable routines
 348  */
 349 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 350 {
 351         if (channel == CHA) {
 352                 info->imra_value |= mask;
 353                 write_reg16(info, CHA + IMR, info->imra_value);
 354         } else {
 355                 info->imrb_value |= mask;
 356                 write_reg16(info, CHB + IMR, info->imrb_value);
 357         }
 358 }
 359 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 360 {
 361         if (channel == CHA) {
 362                 info->imra_value &= ~mask;
 363                 write_reg16(info, CHA + IMR, info->imra_value);
 364         } else {
 365                 info->imrb_value &= ~mask;
 366                 write_reg16(info, CHB + IMR, info->imrb_value);
 367         }
 368 }
 369
 370 #define port_irq_disable(info, mask) \
 371   { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
 372
 373 #define port_irq_enable(info, mask) \
 374   { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
 375
 376 static void rx_start(MGSLPC_INFO *info);
 377 static void rx_stop(MGSLPC_INFO *info);
 378
 379 static void tx_start(MGSLPC_INFO *info);
 380 static void tx_stop(MGSLPC_INFO *info);
 381 static void tx_set_idle(MGSLPC_INFO *info);
 382
 383 static void get_signals(MGSLPC_INFO *info);
 384 static void set_signals(MGSLPC_INFO *info);
 385
 386 static void reset_device(MGSLPC_INFO *info);
 387
 388 static void hdlc_mode(MGSLPC_INFO *info);
 389 static void async_mode(MGSLPC_INFO *info);
 390
 391 static void tx_timeout(unsigned long context);
 392
 393 static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg);
 394
 395 #if SYNCLINK_GENERIC_HDLC
 396 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 397 static void hdlcdev_tx_done(MGSLPC_INFO *info);
 398 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
 399 static int  hdlcdev_init(MGSLPC_INFO *info);
 400 static void hdlcdev_exit(MGSLPC_INFO *info);
 401 #endif
 402
 403 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
 404
 405 static bool register_test(MGSLPC_INFO *info);
 406 static bool irq_test(MGSLPC_INFO *info);
 407 static int adapter_test(MGSLPC_INFO *info);
 408
 409 static int claim_resources(MGSLPC_INFO *info);
 410 static void release_resources(MGSLPC_INFO *info);
 411 static void mgslpc_add_device(MGSLPC_INFO *info);
 412 static void mgslpc_remove_device(MGSLPC_INFO *info);
 413
 414 static bool rx_get_frame(MGSLPC_INFO *info);
 415 static void rx_reset_buffers(MGSLPC_INFO *info);
 416 static int  rx_alloc_buffers(MGSLPC_INFO *info);
 417 static void rx_free_buffers(MGSLPC_INFO *info);
 418
 419 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
 420
 421 /*
 422  * Bottom half interrupt handlers
 423  */
 424 static void bh_handler(struct work_struct *work);
 425 static void bh_transmit(MGSLPC_INFO *info);
 426 static void bh_status(MGSLPC_INFO *info);
 427
 428 /*
 429  * ioctl handlers
 430  */
 431 static int tiocmget(struct tty_struct *tty, struct file *file);
 432 static int tiocmset(struct tty_struct *tty, struct file *file,
 433                     unsigned int set, unsigned int clear);
 434 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
 435 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
 436 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params);
 437 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
 438 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
 439 static int set_txenable(MGSLPC_INFO *info, int enable);
 440 static int tx_abort(MGSLPC_INFO *info);
 441 static int set_rxenable(MGSLPC_INFO *info, int enable);
 442 static int wait_events(MGSLPC_INFO *info, int __user *mask);
 443
 444 static MGSLPC_INFO *mgslpc_device_list = NULL;
 445 static int mgslpc_device_count = 0;
 446
 447 /*
 448  * Set this param to non-zero to load eax with the
 449  * .text section address and breakpoint on module load.
 450  * This is useful for use with gdb and add-symbol-file command.
 451  */
 452 static int break_on_load=0;
 453
 454 /*
 455  * Driver major number, defaults to zero to get auto
 456  * assigned major number. May be forced as module parameter.
 457  */
 458 static int ttymajor=0;
 459
 460 static int debug_level = 0;
 461 static int maxframe[MAX_DEVICE_COUNT] = {0,};
 462 static int dosyncppp[MAX_DEVICE_COUNT] = {1,1,1,1};
 463
 464 module_param(break_on_load, bool, 0);
 465 module_param(ttymajor, int, 0);
 466 module_param(debug_level, int, 0);
 467 module_param_array(maxframe, int, NULL, 0);
 468 module_param_array(dosyncppp, int, NULL, 0);
 469
 470 MODULE_LICENSE("GPL");
 471
 472 static char *driver_name = "SyncLink PC Card driver";
 473 static char *driver_version = "$Revision: 4.34 $";
 474
 475 static struct tty_driver *serial_driver;
 476
 477 /* number of characters left in xmit buffer before we ask for more */
 478 #define WAKEUP_CHARS 256
 479
 480 static void mgslpc_change_params(MGSLPC_INFO *info);
 481 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
 482
 483 /* PCMCIA prototypes */
 484
 485 static int mgslpc_config(struct pcmcia_device *link);
 486 static void mgslpc_release(u_long arg);
 487 static void mgslpc_detach(struct pcmcia_device *p_dev);
 488
 489 /*
 490  * 1st function defined in .text section. Calling this function in
 491  * init_module() followed by a breakpoint allows a remote debugger
 492  * (gdb) to get the .text address for the add-symbol-file command.
 493  * This allows remote debugging of dynamically loadable modules.
 494  */
 495 static void* mgslpc_get_text_ptr(void)
 496 {
 497         return mgslpc_get_text_ptr;
 498 }
 499
 500 /**
 501  * line discipline callback wrappers
 502  *
 503  * The wrappers maintain line discipline references
 504  * while calling into the line discipline.
 505  *
 506  * ldisc_receive_buf  - pass receive data to line discipline
 507  */
 508
 509 static void ldisc_receive_buf(struct tty_struct *tty,
 510                               const __u8 *data, char *flags, int count)
 511 {
 512         struct tty_ldisc *ld;
 513         if (!tty)
 514                 return;
 515         ld = tty_ldisc_ref(tty);
 516         if (ld) {
 517                 if (ld->receive_buf)
 518                         ld->receive_buf(tty, data, flags, count);
 519                 tty_ldisc_deref(ld);
 520         }
 521 }
 522
 523 static int mgslpc_probe(struct pcmcia_device *link)
 524 {
 525     MGSLPC_INFO *info;
 526     int ret;
 527
 528     if (debug_level >= DEBUG_LEVEL_INFO)
 529             printk("mgslpc_attach\n");
 530
 531     info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
 532     if (!info) {
 533             printk("Error can't allocate device instance data\n");
 534             return -ENOMEM;
 535     }
 536
 537     info->magic = MGSLPC_MAGIC;
 538     INIT_WORK(&info->task, bh_handler);
 539     info->max_frame_size = 4096;
 540     info->close_delay = 5*HZ/10;
 541     info->closing_wait = 30*HZ;
 542     init_waitqueue_head(&info->open_wait);
 543     init_waitqueue_head(&info->close_wait);
 544     init_waitqueue_head(&info->status_event_wait_q);
 545     init_waitqueue_head(&info->event_wait_q);
 546     spin_lock_init(&info->lock);
 547     spin_lock_init(&info->netlock);
 548     memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
 549     info->idle_mode = HDLC_TXIDLE_FLAGS;
 550     info->imra_value = 0xffff;
 551     info->imrb_value = 0xffff;
 552     info->pim_value = 0xff;
 553
 554     info->p_dev = link;
 555     link->priv = info;
 556
 557     /* Initialize the struct pcmcia_device structure */
 558
 559     /* Interrupt setup */
 560     link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
 561     link->irq.IRQInfo1   = IRQ_LEVEL_ID;
 562     link->irq.Handler = NULL;
 563
 564     link->conf.Attributes = 0;
 565     link->conf.IntType = INT_MEMORY_AND_IO;
 566
 567     ret = mgslpc_config(link);
 568     if (ret)
 569             return ret;
 570
 571     mgslpc_add_device(info);
 572
 573     return 0;
 574 }
 575
 576 /* Card has been inserted.
 577  */
 578
 579 #define CS_CHECK(fn, ret) \
 580 do { last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; } while (0)
 581
 582 static int mgslpc_config(struct pcmcia_device *link)
 583 {
 584     MGSLPC_INFO *info = link->priv;
 585     tuple_t tuple;
 586     cisparse_t parse;
 587     int last_fn, last_ret;
 588     u_char buf[64];
 589     cistpl_cftable_entry_t dflt = { 0 };
 590     cistpl_cftable_entry_t *cfg;
 591
 592     if (debug_level >= DEBUG_LEVEL_INFO)
 593             printk("mgslpc_config(0x%p)\n", link);
 594
 595     tuple.Attributes = 0;
 596     tuple.TupleData = buf;
 597     tuple.TupleDataMax = sizeof(buf);
 598     tuple.TupleOffset = 0;
 599
 600     /* get CIS configuration entry */
 601
 602     tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
 603     CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(link, &tuple));
 604
 605     cfg = &(parse.cftable_entry);
 606     CS_CHECK(GetTupleData, pcmcia_get_tuple_data(link, &tuple));
 607     CS_CHECK(ParseTuple, pcmcia_parse_tuple(link, &tuple, &parse));
 608
 609     if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
 610     if (cfg->index == 0)
 611             goto cs_failed;
 612
 613     link->conf.ConfigIndex = cfg->index;
 614     link->conf.Attributes |= CONF_ENABLE_IRQ;
 615
 616     /* IO window settings */
 617     link->io.NumPorts1 = 0;
 618     if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
 619             cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
 620             link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
 621             if (!(io->flags & CISTPL_IO_8BIT))
 622                     link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
 623             if (!(io->flags & CISTPL_IO_16BIT))
 624                     link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
 625             link->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
 626             link->io.BasePort1 = io->win[0].base;
 627             link->io.NumPorts1 = io->win[0].len;
 628             CS_CHECK(RequestIO, pcmcia_request_io(link, &link->io));
 629     }
 630
 631     link->conf.Attributes = CONF_ENABLE_IRQ;
 632     link->conf.IntType = INT_MEMORY_AND_IO;
 633     link->conf.ConfigIndex = 8;
 634     link->conf.Present = PRESENT_OPTION;
 635
 636     link->irq.Attributes |= IRQ_HANDLE_PRESENT;
 637     link->irq.Handler     = mgslpc_isr;
 638     link->irq.Instance    = info;
 639     CS_CHECK(RequestIRQ, pcmcia_request_irq(link, &link->irq));
 640
 641     CS_CHECK(RequestConfiguration, pcmcia_request_configuration(link, &link->conf));
 642
 643     info->io_base = link->io.BasePort1;
 644     info->irq_level = link->irq.AssignedIRQ;
 645
 646     /* add to linked list of devices */
 647     sprintf(info->node.dev_name, "mgslpc0");
 648     info->node.major = info->node.minor = 0;
 649     link->dev_node = &info->node;
 650
 651     printk(KERN_INFO "%s: index 0x%02x:",
 652            info->node.dev_name, link->conf.ConfigIndex);
 653     if (link->conf.Attributes & CONF_ENABLE_IRQ)
 654             printk(", irq %d", link->irq.AssignedIRQ);
 655     if (link->io.NumPorts1)
 656             printk(", io 0x%04x-0x%04x", link->io.BasePort1,
 657                    link->io.BasePort1+link->io.NumPorts1-1);
 658     printk("\n");
 659     return 0;
 660
 661 cs_failed:
 662     cs_error(link, last_fn, last_ret);
 663     mgslpc_release((u_long)link);
 664     return -ENODEV;
 665 }
 666
 667 /* Card has been removed.
 668  * Unregister device and release PCMCIA configuration.
 669  * If device is open, postpone until it is closed.
 670  */
 671 static void mgslpc_release(u_long arg)
 672 {
 673         struct pcmcia_device *link = (struct pcmcia_device *)arg;
 674
 675         if (debug_level >= DEBUG_LEVEL_INFO)
 676                 printk("mgslpc_release(0x%p)\n", link);
 677
 678         pcmcia_disable_device(link);
 679 }
 680
 681 static void mgslpc_detach(struct pcmcia_device *link)
 682 {
 683         if (debug_level >= DEBUG_LEVEL_INFO)
 684                 printk("mgslpc_detach(0x%p)\n", link);
 685
 686         ((MGSLPC_INFO *)link->priv)->stop = 1;
 687         mgslpc_release((u_long)link);
 688
 689         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
 690 }
 691
 692 static int mgslpc_suspend(struct pcmcia_device *link)
 693 {
 694         MGSLPC_INFO *info = link->priv;
 695
 696         info->stop = 1;
 697
 698         return 0;
 699 }
 700
 701 static int mgslpc_resume(struct pcmcia_device *link)
 702 {
 703         MGSLPC_INFO *info = link->priv;
 704
 705         info->stop = 0;
 706
 707         return 0;
 708 }
 709
 710
 711 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
 712                                         char *name, const char *routine)
 713 {
 714 #ifdef MGSLPC_PARANOIA_CHECK
 715         static const char *badmagic =
 716                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
 717         static const char *badinfo =
 718                 "Warning: null mgslpc_info for (%s) in %s\n";
 719
 720         if (!info) {
 721                 printk(badinfo, name, routine);
 722                 return true;
 723         }
 724         if (info->magic != MGSLPC_MAGIC) {
 725                 printk(badmagic, name, routine);
 726                 return true;
 727         }
 728 #else
 729         if (!info)
 730                 return true;
 731 #endif
 732         return false;
 733 }
 734
 735
 736 #define CMD_RXFIFO      BIT7    // release current rx FIFO
 737 #define CMD_RXRESET     BIT6    // receiver reset
 738 #define CMD_RXFIFO_READ BIT5
 739 #define CMD_START_TIMER BIT4
 740 #define CMD_TXFIFO      BIT3    // release current tx FIFO
 741 #define CMD_TXEOM       BIT1    // transmit end message
 742 #define CMD_TXRESET     BIT0    // transmit reset
 743
 744 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
 745 {
 746         int i = 0;
 747         /* wait for command completion */
 748         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
 749                 udelay(1);
 750                 if (i++ == 1000)
 751                         return false;
 752         }
 753         return true;
 754 }
 755
 756 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
 757 {
 758         wait_command_complete(info, channel);
 759         write_reg(info, (unsigned char) (channel + CMDR), cmd);
 760 }
 761
 762 static void tx_pause(struct tty_struct *tty)
 763 {
 764         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 765         unsigned long flags;
 766
 767         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
 768                 return;
 769         if (debug_level >= DEBUG_LEVEL_INFO)
 770                 printk("tx_pause(%s)\n",info->device_name);
 771
 772         spin_lock_irqsave(&info->lock,flags);
 773         if (info->tx_enabled)
 774                 tx_stop(info);
 775         spin_unlock_irqrestore(&info->lock,flags);
 776 }
 777
 778 static void tx_release(struct tty_struct *tty)
 779 {
 780         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 781         unsigned long flags;
 782
 783         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
 784                 return;
 785         if (debug_level >= DEBUG_LEVEL_INFO)
 786                 printk("tx_release(%s)\n",info->device_name);
 787
 788         spin_lock_irqsave(&info->lock,flags);
 789         if (!info->tx_enabled)
 790                 tx_start(info);
 791         spin_unlock_irqrestore(&info->lock,flags);
 792 }
 793
 794 /* Return next bottom half action to perform.
 795  * or 0 if nothing to do.
 796  */
 797 static int bh_action(MGSLPC_INFO *info)
 798 {
 799         unsigned long flags;
 800         int rc = 0;
 801
 802         spin_lock_irqsave(&info->lock,flags);
 803
 804         if (info->pending_bh & BH_RECEIVE) {
 805                 info->pending_bh &= ~BH_RECEIVE;
 806                 rc = BH_RECEIVE;
 807         } else if (info->pending_bh & BH_TRANSMIT) {
 808                 info->pending_bh &= ~BH_TRANSMIT;
 809                 rc = BH_TRANSMIT;
 810         } else if (info->pending_bh & BH_STATUS) {
 811                 info->pending_bh &= ~BH_STATUS;
 812                 rc = BH_STATUS;
 813         }
 814
 815         if (!rc) {
 816                 /* Mark BH routine as complete */
 817                 info->bh_running = false;
 818                 info->bh_requested = false;
 819         }
 820
 821         spin_unlock_irqrestore(&info->lock,flags);
 822
 823         return rc;
 824 }
 825
 826 static void bh_handler(struct work_struct *work)
 827 {
 828         MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
 829         int action;
 830
 831         if (!info)
 832                 return;
 833
 834         if (debug_level >= DEBUG_LEVEL_BH)
 835                 printk( "%s(%d):bh_handler(%s) entry\n",
 836                         __FILE__,__LINE__,info->device_name);
 837
 838         info->bh_running = true;
 839
 840         while((action = bh_action(info)) != 0) {
 841
 842                 /* Process work item */
 843                 if ( debug_level >= DEBUG_LEVEL_BH )
 844                         printk( "%s(%d):bh_handler() work item action=%d\n",
 845                                 __FILE__,__LINE__,action);
 846
 847                 switch (action) {
 848
 849                 case BH_RECEIVE:
 850                         while(rx_get_frame(info));
 851                         break;
 852                 case BH_TRANSMIT:
 853                         bh_transmit(info);
 854                         break;
 855                 case BH_STATUS:
 856                         bh_status(info);
 857                         break;
 858                 default:
 859                         /* unknown work item ID */
 860                         printk("Unknown work item ID=%08X!\n", action);
 861                         break;
 862                 }
 863         }
 864
 865         if (debug_level >= DEBUG_LEVEL_BH)
 866                 printk( "%s(%d):bh_handler(%s) exit\n",
 867                         __FILE__,__LINE__,info->device_name);
 868 }
 869
 870 static void bh_transmit(MGSLPC_INFO *info)
 871 {
 872         struct tty_struct *tty = info->tty;
 873         if (debug_level >= DEBUG_LEVEL_BH)
 874                 printk("bh_transmit() entry on %s\n", info->device_name);
 875
 876         if (tty)
 877                 tty_wakeup(tty);
 878 }
 879
 880 static void bh_status(MGSLPC_INFO *info)
 881 {
 882         info->ri_chkcount = 0;
 883         info->dsr_chkcount = 0;
 884         info->dcd_chkcount = 0;
 885         info->cts_chkcount = 0;
 886 }
 887
 888 /* eom: non-zero = end of frame */
 889 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
 890 {
 891         unsigned char data[2];
 892         unsigned char fifo_count, read_count, i;
 893         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
 894
 895         if (debug_level >= DEBUG_LEVEL_ISR)
 896                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
 897
 898         if (!info->rx_enabled)
 899                 return;
 900
 901         if (info->rx_frame_count >= info->rx_buf_count) {
 902                 /* no more free buffers */
 903                 issue_command(info, CHA, CMD_RXRESET);
 904                 info->pending_bh |= BH_RECEIVE;
 905                 info->rx_overflow = true;
 906                 info->icount.buf_overrun++;
 907                 return;
 908         }
 909
 910         if (eom) {
 911                 /* end of frame, get FIFO count from RBCL register */
 912                 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
 913                         fifo_count = 32;
 914         } else
 915                 fifo_count = 32;
 916
 917         do {
 918                 if (fifo_count == 1) {
 919                         read_count = 1;
 920                         data[0] = read_reg(info, CHA + RXFIFO);
 921                 } else {
 922                         read_count = 2;
 923                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
 924                 }
 925                 fifo_count -= read_count;
 926                 if (!fifo_count && eom)
 927                         buf->status = data[--read_count];
 928
 929                 for (i = 0; i < read_count; i++) {
 930                         if (buf->count >= info->max_frame_size) {
 931                                 /* frame too large, reset receiver and reset current buffer */
 932                                 issue_command(info, CHA, CMD_RXRESET);
 933                                 buf->count = 0;
 934                                 return;
 935                         }
 936                         *(buf->data + buf->count) = data[i];
 937                         buf->count++;
 938                 }
 939         } while (fifo_count);
 940
 941         if (eom) {
 942                 info->pending_bh |= BH_RECEIVE;
 943                 info->rx_frame_count++;
 944                 info->rx_put++;
 945                 if (info->rx_put >= info->rx_buf_count)
 946                         info->rx_put = 0;
 947         }
 948         issue_command(info, CHA, CMD_RXFIFO);
 949 }
 950
 951 static void rx_ready_async(MGSLPC_INFO *info, int tcd)
 952 {
 953         unsigned char data, status, flag;
 954         int fifo_count;
 955         int work = 0;
 956         struct tty_struct *tty = info->tty;
 957         struct mgsl_icount *icount = &info->icount;
 958
 959         if (tcd) {
 960                 /* early termination, get FIFO count from RBCL register */
 961                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
 962
 963                 /* Zero fifo count could mean 0 or 32 bytes available.
 964                  * If BIT5 of STAR is set then at least 1 byte is available.
 965                  */
 966                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
 967                         fifo_count = 32;
 968         } else
 969                 fifo_count = 32;
 970
 971         tty_buffer_request_room(tty, fifo_count);
 972         /* Flush received async data to receive data buffer. */
 973         while (fifo_count) {
 974                 data   = read_reg(info, CHA + RXFIFO);
 975                 status = read_reg(info, CHA + RXFIFO);
 976                 fifo_count -= 2;
 977
 978                 icount->rx++;
 979                 flag = TTY_NORMAL;
 980
 981                 // if no frameing/crc error then save data
 982                 // BIT7:parity error
 983                 // BIT6:framing error
 984
 985                 if (status & (BIT7 + BIT6)) {
 986                         if (status & BIT7)
 987                                 icount->parity++;
 988                         else
 989                                 icount->frame++;
 990
 991                         /* discard char if tty control flags say so */
 992                         if (status & info->ignore_status_mask)
 993                                 continue;
 994
 995                         status &= info->read_status_mask;
 996
 997                         if (status & BIT7)
 998                                 flag = TTY_PARITY;
 999                         else if (status & BIT6)
1000                                 flag = TTY_FRAME;
1001                 }
1002                 work += tty_insert_flip_char(tty, data, flag);
1003         }
1004         issue_command(info, CHA, CMD_RXFIFO);
1005
1006         if (debug_level >= DEBUG_LEVEL_ISR) {
1007                 printk("%s(%d):rx_ready_async",
1008                         __FILE__,__LINE__);
1009                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1010                         __FILE__,__LINE__,icount->rx,icount->brk,
1011                         icount->parity,icount->frame,icount->overrun);
1012         }
1013
1014         if (work)
1015                 tty_flip_buffer_push(tty);
1016 }
1017
1018
1019 static void tx_done(MGSLPC_INFO *info)
1020 {
1021         if (!info->tx_active)
1022                 return;
1023
1024         info->tx_active = false;
1025         info->tx_aborting = false;
1026
1027         if (info->params.mode == MGSL_MODE_ASYNC)
1028                 return;
1029
1030         info->tx_count = info->tx_put = info->tx_get = 0;
1031         del_timer(&info->tx_timer);
1032
1033         if (info->drop_rts_on_tx_done) {
1034                 get_signals(info);
1035                 if (info->serial_signals & SerialSignal_RTS) {
1036                         info->serial_signals &= ~SerialSignal_RTS;
1037                         set_signals(info);
1038                 }
1039                 info->drop_rts_on_tx_done = false;
1040         }
1041
1042 #if SYNCLINK_GENERIC_HDLC
1043         if (info->netcount)
1044                 hdlcdev_tx_done(info);
1045         else
1046 #endif
1047         {
1048                 if (info->tty->stopped || info->tty->hw_stopped) {
1049                         tx_stop(info);
1050                         return;
1051                 }
1052                 info->pending_bh |= BH_TRANSMIT;
1053         }
1054 }
1055
1056 static void tx_ready(MGSLPC_INFO *info)
1057 {
1058         unsigned char fifo_count = 32;
1059         int c;
1060
1061         if (debug_level >= DEBUG_LEVEL_ISR)
1062                 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
1063
1064         if (info->params.mode == MGSL_MODE_HDLC) {
1065                 if (!info->tx_active)
1066                         return;
1067         } else {
1068                 if (info->tty->stopped || info->tty->hw_stopped) {
1069                         tx_stop(info);
1070                         return;
1071                 }
1072                 if (!info->tx_count)
1073                         info->tx_active = false;
1074         }
1075
1076         if (!info->tx_count)
1077                 return;
1078
1079         while (info->tx_count && fifo_count) {
1080                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1081
1082                 if (c == 1) {
1083                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1084                 } else {
1085                         write_reg16(info, CHA + TXFIFO,
1086                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1087                 }
1088                 info->tx_count -= c;
1089                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1090                 fifo_count -= c;
1091         }
1092
1093         if (info->params.mode == MGSL_MODE_ASYNC) {
1094                 if (info->tx_count < WAKEUP_CHARS)
1095                         info->pending_bh |= BH_TRANSMIT;
1096                 issue_command(info, CHA, CMD_TXFIFO);
1097         } else {
1098                 if (info->tx_count)
1099                         issue_command(info, CHA, CMD_TXFIFO);
1100                 else
1101                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1102         }
1103 }
1104
1105 static void cts_change(MGSLPC_INFO *info)
1106 {
1107         get_signals(info);
1108         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1109                 irq_disable(info, CHB, IRQ_CTS);
1110         info->icount.cts++;
1111         if (info->serial_signals & SerialSignal_CTS)
1112                 info->input_signal_events.cts_up++;
1113         else
1114                 info->input_signal_events.cts_down++;
1115         wake_up_interruptible(&info->status_event_wait_q);
1116         wake_up_interruptible(&info->event_wait_q);
1117
1118         if (info->flags & ASYNC_CTS_FLOW) {
1119                 if (info->tty->hw_stopped) {
1120                         if (info->serial_signals & SerialSignal_CTS) {
1121                                 if (debug_level >= DEBUG_LEVEL_ISR)
1122                                         printk("CTS tx start...");
1123                                 if (info->tty)
1124                                         info->tty->hw_stopped = 0;
1125                                 tx_start(info);
1126                                 info->pending_bh |= BH_TRANSMIT;
1127                                 return;
1128                         }
1129                 } else {
1130                         if (!(info->serial_signals & SerialSignal_CTS)) {
1131                                 if (debug_level >= DEBUG_LEVEL_ISR)
1132                                         printk("CTS tx stop...");
1133                                 if (info->tty)
1134                                         info->tty->hw_stopped = 1;
1135                                 tx_stop(info);
1136                         }
1137                 }
1138         }
1139         info->pending_bh |= BH_STATUS;
1140 }
1141
1142 static void dcd_change(MGSLPC_INFO *info)
1143 {
1144         get_signals(info);
1145         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1146                 irq_disable(info, CHB, IRQ_DCD);
1147         info->icount.dcd++;
1148         if (info->serial_signals & SerialSignal_DCD) {
1149                 info->input_signal_events.dcd_up++;
1150         }
1151         else
1152                 info->input_signal_events.dcd_down++;
1153 #if SYNCLINK_GENERIC_HDLC
1154         if (info->netcount) {
1155                 if (info->serial_signals & SerialSignal_DCD)
1156                         netif_carrier_on(info->netdev);
1157                 else
1158                         netif_carrier_off(info->netdev);
1159         }
1160 #endif
1161         wake_up_interruptible(&info->status_event_wait_q);
1162         wake_up_interruptible(&info->event_wait_q);
1163
1164         if (info->flags & ASYNC_CHECK_CD) {
1165                 if (debug_level >= DEBUG_LEVEL_ISR)
1166                         printk("%s CD now %s...", info->device_name,
1167                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1168                 if (info->serial_signals & SerialSignal_DCD)
1169                         wake_up_interruptible(&info->open_wait);
1170                 else {
1171                         if (debug_level >= DEBUG_LEVEL_ISR)
1172                                 printk("doing serial hangup...");
1173                         if (info->tty)
1174                                 tty_hangup(info->tty);
1175                 }
1176         }
1177         info->pending_bh |= BH_STATUS;
1178 }
1179
1180 static void dsr_change(MGSLPC_INFO *info)
1181 {
1182         get_signals(info);
1183         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1184                 port_irq_disable(info, PVR_DSR);
1185         info->icount.dsr++;
1186         if (info->serial_signals & SerialSignal_DSR)
1187                 info->input_signal_events.dsr_up++;
1188         else
1189                 info->input_signal_events.dsr_down++;
1190         wake_up_interruptible(&info->status_event_wait_q);
1191         wake_up_interruptible(&info->event_wait_q);
1192         info->pending_bh |= BH_STATUS;
1193 }
1194
1195 static void ri_change(MGSLPC_INFO *info)
1196 {
1197         get_signals(info);
1198         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1199                 port_irq_disable(info, PVR_RI);
1200         info->icount.rng++;
1201         if (info->serial_signals & SerialSignal_RI)
1202                 info->input_signal_events.ri_up++;
1203         else
1204                 info->input_signal_events.ri_down++;
1205         wake_up_interruptible(&info->status_event_wait_q);
1206         wake_up_interruptible(&info->event_wait_q);
1207         info->pending_bh |= BH_STATUS;
1208 }
1209
1210 /* Interrupt service routine entry point.
1211  *
1212  * Arguments:
1213  *
1214  * irq     interrupt number that caused interrupt
1215  * dev_id  device ID supplied during interrupt registration
1216  */
1217 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1218 {
1219         MGSLPC_INFO *info = dev_id;
1220         unsigned short isr;
1221         unsigned char gis, pis;
1222         int count=0;
1223
1224         if (debug_level >= DEBUG_LEVEL_ISR)
1225                 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1226
1227         if (!(info->p_dev->_locked))
1228                 return IRQ_HANDLED;
1229
1230         spin_lock(&info->lock);
1231
1232         while ((gis = read_reg(info, CHA + GIS))) {
1233                 if (debug_level >= DEBUG_LEVEL_ISR)
1234                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1235
1236                 if ((gis & 0x70) || count > 1000) {
1237                         printk("synclink_cs:hardware failed or ejected\n");
1238                         break;
1239                 }
1240                 count++;
1241
1242                 if (gis & (BIT1 + BIT0)) {
1243                         isr = read_reg16(info, CHB + ISR);
1244                         if (isr & IRQ_DCD)
1245                                 dcd_change(info);
1246                         if (isr & IRQ_CTS)
1247                                 cts_change(info);
1248                 }
1249                 if (gis & (BIT3 + BIT2))
1250                 {
1251                         isr = read_reg16(info, CHA + ISR);
1252                         if (isr & IRQ_TIMER) {
1253                                 info->irq_occurred = true;
1254                                 irq_disable(info, CHA, IRQ_TIMER);
1255                         }
1256
1257                         /* receive IRQs */
1258                         if (isr & IRQ_EXITHUNT) {
1259                                 info->icount.exithunt++;
1260                                 wake_up_interruptible(&info->event_wait_q);
1261                         }
1262                         if (isr & IRQ_BREAK_ON) {
1263                                 info->icount.brk++;
1264                                 if (info->flags & ASYNC_SAK)
1265                                         do_SAK(info->tty);
1266                         }
1267                         if (isr & IRQ_RXTIME) {
1268                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1269                         }
1270                         if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1271                                 if (info->params.mode == MGSL_MODE_HDLC)
1272                                         rx_ready_hdlc(info, isr & IRQ_RXEOM);
1273                                 else
1274                                         rx_ready_async(info, isr & IRQ_RXEOM);
1275                         }
1276
1277                         /* transmit IRQs */
1278                         if (isr & IRQ_UNDERRUN) {
1279                                 if (info->tx_aborting)
1280                                         info->icount.txabort++;
1281                                 else
1282                                         info->icount.txunder++;
1283                                 tx_done(info);
1284                         }
1285                         else if (isr & IRQ_ALLSENT) {
1286                                 info->icount.txok++;
1287                                 tx_done(info);
1288                         }
1289                         else if (isr & IRQ_TXFIFO)
1290                                 tx_ready(info);
1291                 }
1292                 if (gis & BIT7) {
1293                         pis = read_reg(info, CHA + PIS);
1294                         if (pis & BIT1)
1295                                 dsr_change(info);
1296                         if (pis & BIT2)
1297                                 ri_change(info);
1298                 }
1299         }
1300
1301         /* Request bottom half processing if there's something
1302          * for it to do and the bh is not already running
1303          */
1304
1305         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1306                 if ( debug_level >= DEBUG_LEVEL_ISR )
1307                         printk("%s(%d):%s queueing bh task.\n",
1308                                 __FILE__,__LINE__,info->device_name);
1309                 schedule_work(&info->task);
1310                 info->bh_requested = true;
1311         }
1312
1313         spin_unlock(&info->lock);
1314
1315         if (debug_level >= DEBUG_LEVEL_ISR)
1316                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1317                        __FILE__, __LINE__, info->irq_level);
1318
1319         return IRQ_HANDLED;
1320 }
1321
1322 /* Initialize and start device.
1323  */
1324 static int startup(MGSLPC_INFO * info)
1325 {
1326         int retval = 0;
1327
1328         if (debug_level >= DEBUG_LEVEL_INFO)
1329                 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1330
1331         if (info->flags & ASYNC_INITIALIZED)
1332                 return 0;
1333
1334         if (!info->tx_buf) {
1335                 /* allocate a page of memory for a transmit buffer */
1336                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1337                 if (!info->tx_buf) {
1338                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1339                                 __FILE__,__LINE__,info->device_name);
1340                         return -ENOMEM;
1341                 }
1342         }
1343
1344         info->pending_bh = 0;
1345
1346         memset(&info->icount, 0, sizeof(info->icount));
1347
1348         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1349
1350         /* Allocate and claim adapter resources */
1351         retval = claim_resources(info);
1352
1353         /* perform existance check and diagnostics */
1354         if ( !retval )
1355                 retval = adapter_test(info);
1356
1357         if ( retval ) {
1358                 if (capable(CAP_SYS_ADMIN) && info->tty)
1359                         set_bit(TTY_IO_ERROR, &info->tty->flags);
1360                 release_resources(info);
1361                 return retval;
1362         }
1363
1364         /* program hardware for current parameters */
1365         mgslpc_change_params(info);
1366
1367         if (info->tty)
1368                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1369
1370         info->flags |= ASYNC_INITIALIZED;
1371
1372         return 0;
1373 }
1374
1375 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1376  */
1377 static void shutdown(MGSLPC_INFO * info)
1378 {
1379         unsigned long flags;
1380
1381         if (!(info->flags & ASYNC_INITIALIZED))
1382                 return;
1383
1384         if (debug_level >= DEBUG_LEVEL_INFO)
1385                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1386                          __FILE__,__LINE__, info->device_name );
1387
1388         /* clear status wait queue because status changes */
1389         /* can't happen after shutting down the hardware */
1390         wake_up_interruptible(&info->status_event_wait_q);
1391         wake_up_interruptible(&info->event_wait_q);
1392
1393         del_timer_sync(&info->tx_timer);
1394
1395         if (info->tx_buf) {
1396                 free_page((unsigned long) info->tx_buf);
1397                 info->tx_buf = NULL;
1398         }
1399
1400         spin_lock_irqsave(&info->lock,flags);
1401
1402         rx_stop(info);
1403         tx_stop(info);
1404
1405         /* TODO:disable interrupts instead of reset to preserve signal states */
1406         reset_device(info);
1407
1408         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1409                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1410                 set_signals(info);
1411         }
1412
1413         spin_unlock_irqrestore(&info->lock,flags);
1414
1415         release_resources(info);
1416
1417         if (info->tty)
1418                 set_bit(TTY_IO_ERROR, &info->tty->flags);
1419
1420         info->flags &= ~ASYNC_INITIALIZED;
1421 }
1422
1423 static void mgslpc_program_hw(MGSLPC_INFO *info)
1424 {
1425         unsigned long flags;
1426
1427         spin_lock_irqsave(&info->lock,flags);
1428
1429         rx_stop(info);
1430         tx_stop(info);
1431         info->tx_count = info->tx_put = info->tx_get = 0;
1432
1433         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1434                 hdlc_mode(info);
1435         else
1436                 async_mode(info);
1437
1438         set_signals(info);
1439
1440         info->dcd_chkcount = 0;
1441         info->cts_chkcount = 0;
1442         info->ri_chkcount = 0;
1443         info->dsr_chkcount = 0;
1444
1445         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1446         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1447         get_signals(info);
1448
1449         if (info->netcount || info->tty->termios->c_cflag & CREAD)
1450                 rx_start(info);
1451
1452         spin_unlock_irqrestore(&info->lock,flags);
1453 }
1454
1455 /* Reconfigure adapter based on new parameters
1456  */
1457 static void mgslpc_change_params(MGSLPC_INFO *info)
1458 {
1459         unsigned cflag;
1460         int bits_per_char;
1461
1462         if (!info->tty || !info->tty->termios)
1463                 return;
1464
1465         if (debug_level >= DEBUG_LEVEL_INFO)
1466                 printk("%s(%d):mgslpc_change_params(%s)\n",
1467                          __FILE__,__LINE__, info->device_name );
1468
1469         cflag = info->tty->termios->c_cflag;
1470
1471         /* if B0 rate (hangup) specified then negate DTR and RTS */
1472         /* otherwise assert DTR and RTS */
1473         if (cflag & CBAUD)
1474                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1475         else
1476                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1477
1478         /* byte size and parity */
1479
1480         switch (cflag & CSIZE) {
1481         case CS5: info->params.data_bits = 5; break;
1482         case CS6: info->params.data_bits = 6; break;
1483         case CS7: info->params.data_bits = 7; break;
1484         case CS8: info->params.data_bits = 8; break;
1485         default:  info->params.data_bits = 7; break;
1486         }
1487
1488         if (cflag & CSTOPB)
1489                 info->params.stop_bits = 2;
1490         else
1491                 info->params.stop_bits = 1;
1492
1493         info->params.parity = ASYNC_PARITY_NONE;
1494         if (cflag & PARENB) {
1495                 if (cflag & PARODD)
1496                         info->params.parity = ASYNC_PARITY_ODD;
1497                 else
1498                         info->params.parity = ASYNC_PARITY_EVEN;
1499 #ifdef CMSPAR
1500                 if (cflag & CMSPAR)
1501                         info->params.parity = ASYNC_PARITY_SPACE;
1502 #endif
1503         }
1504
1505         /* calculate number of jiffies to transmit a full
1506          * FIFO (32 bytes) at specified data rate
1507          */
1508         bits_per_char = info->params.data_bits +
1509                         info->params.stop_bits + 1;
1510
1511         /* if port data rate is set to 460800 or less then
1512          * allow tty settings to override, otherwise keep the
1513          * current data rate.
1514          */
1515         if (info->params.data_rate <= 460800) {
1516                 info->params.data_rate = tty_get_baud_rate(info->tty);
1517         }
1518
1519         if ( info->params.data_rate ) {
1520                 info->timeout = (32*HZ*bits_per_char) /
1521                                 info->params.data_rate;
1522         }
1523         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1524
1525         if (cflag & CRTSCTS)
1526                 info->flags |= ASYNC_CTS_FLOW;
1527         else
1528                 info->flags &= ~ASYNC_CTS_FLOW;
1529
1530         if (cflag & CLOCAL)
1531                 info->flags &= ~ASYNC_CHECK_CD;
1532         else
1533                 info->flags |= ASYNC_CHECK_CD;
1534
1535         /* process tty input control flags */
1536
1537         info->read_status_mask = 0;
1538         if (I_INPCK(info->tty))
1539                 info->read_status_mask |= BIT7 | BIT6;
1540         if (I_IGNPAR(info->tty))
1541                 info->ignore_status_mask |= BIT7 | BIT6;
1542
1543         mgslpc_program_hw(info);
1544 }
1545
1546 /* Add a character to the transmit buffer
1547  */
1548 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1549 {
1550         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1551         unsigned long flags;
1552
1553         if (debug_level >= DEBUG_LEVEL_INFO) {
1554                 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1555                         __FILE__,__LINE__,ch,info->device_name);
1556         }
1557
1558         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1559                 return 0;
1560
1561         if (!info->tx_buf)
1562                 return 0;
1563
1564         spin_lock_irqsave(&info->lock,flags);
1565
1566         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1567                 if (info->tx_count < TXBUFSIZE - 1) {
1568                         info->tx_buf[info->tx_put++] = ch;
1569                         info->tx_put &= TXBUFSIZE-1;
1570                         info->tx_count++;
1571                 }
1572         }
1573
1574         spin_unlock_irqrestore(&info->lock,flags);
1575         return 1;
1576 }
1577
1578 /* Enable transmitter so remaining characters in the
1579  * transmit buffer are sent.
1580  */
1581 static void mgslpc_flush_chars(struct tty_struct *tty)
1582 {
1583         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1584         unsigned long flags;
1585
1586         if (debug_level >= DEBUG_LEVEL_INFO)
1587                 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1588                         __FILE__,__LINE__,info->device_name,info->tx_count);
1589
1590         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1591                 return;
1592
1593         if (info->tx_count <= 0 || tty->stopped ||
1594             tty->hw_stopped || !info->tx_buf)
1595                 return;
1596
1597         if (debug_level >= DEBUG_LEVEL_INFO)
1598                 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1599                         __FILE__,__LINE__,info->device_name);
1600
1601         spin_lock_irqsave(&info->lock,flags);
1602         if (!info->tx_active)
1603                 tx_start(info);
1604         spin_unlock_irqrestore(&info->lock,flags);
1605 }
1606
1607 /* Send a block of data
1608  *
1609  * Arguments:
1610  *
1611  * tty        pointer to tty information structure
1612  * buf        pointer to buffer containing send data
1613  * count      size of send data in bytes
1614  *
1615  * Returns: number of characters written
1616  */
1617 static int mgslpc_write(struct tty_struct * tty,
1618                         const unsigned char *buf, int count)
1619 {
1620         int c, ret = 0;
1621         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1622         unsigned long flags;
1623
1624         if (debug_level >= DEBUG_LEVEL_INFO)
1625                 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1626                         __FILE__,__LINE__,info->device_name,count);
1627
1628         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1629                 !info->tx_buf)
1630                 goto cleanup;
1631
1632         if (info->params.mode == MGSL_MODE_HDLC) {
1633                 if (count > TXBUFSIZE) {
1634                         ret = -EIO;
1635                         goto cleanup;
1636                 }
1637                 if (info->tx_active)
1638                         goto cleanup;
1639                 else if (info->tx_count)
1640                         goto start;
1641         }
1642
1643         for (;;) {
1644                 c = min(count,
1645                         min(TXBUFSIZE - info->tx_count - 1,
1646                             TXBUFSIZE - info->tx_put));
1647                 if (c <= 0)
1648                         break;
1649
1650                 memcpy(info->tx_buf + info->tx_put, buf, c);
1651
1652                 spin_lock_irqsave(&info->lock,flags);
1653                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1654                 info->tx_count += c;
1655                 spin_unlock_irqrestore(&info->lock,flags);
1656
1657                 buf += c;
1658                 count -= c;
1659                 ret += c;
1660         }
1661 start:
1662         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1663                 spin_lock_irqsave(&info->lock,flags);
1664                 if (!info->tx_active)
1665                         tx_start(info);
1666                 spin_unlock_irqrestore(&info->lock,flags);
1667         }
1668 cleanup:
1669         if (debug_level >= DEBUG_LEVEL_INFO)
1670                 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1671                         __FILE__,__LINE__,info->device_name,ret);
1672         return ret;
1673 }
1674
1675 /* Return the count of free bytes in transmit buffer
1676  */
1677 static int mgslpc_write_room(struct tty_struct *tty)
1678 {
1679         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1680         int ret;
1681
1682         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1683                 return 0;
1684
1685         if (info->params.mode == MGSL_MODE_HDLC) {
1686                 /* HDLC (frame oriented) mode */
1687                 if (info->tx_active)
1688                         return 0;
1689                 else
1690                         return HDLC_MAX_FRAME_SIZE;
1691         } else {
1692                 ret = TXBUFSIZE - info->tx_count - 1;
1693                 if (ret < 0)
1694                         ret = 0;
1695         }
1696
1697         if (debug_level >= DEBUG_LEVEL_INFO)
1698                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1699                          __FILE__,__LINE__, info->device_name, ret);
1700         return ret;
1701 }
1702
1703 /* Return the count of bytes in transmit buffer
1704  */
1705 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1706 {
1707         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1708         int rc;
1709
1710         if (debug_level >= DEBUG_LEVEL_INFO)
1711                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1712                          __FILE__,__LINE__, info->device_name );
1713
1714         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1715                 return 0;
1716
1717         if (info->params.mode == MGSL_MODE_HDLC)
1718                 rc = info->tx_active ? info->max_frame_size : 0;
1719         else
1720                 rc = info->tx_count;
1721
1722         if (debug_level >= DEBUG_LEVEL_INFO)
1723                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1724                          __FILE__,__LINE__, info->device_name, rc);
1725
1726         return rc;
1727 }
1728
1729 /* Discard all data in the send buffer
1730  */
1731 static void mgslpc_flush_buffer(struct tty_struct *tty)
1732 {
1733         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1734         unsigned long flags;
1735
1736         if (debug_level >= DEBUG_LEVEL_INFO)
1737                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1738                          __FILE__,__LINE__, info->device_name );
1739
1740         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1741                 return;
1742
1743         spin_lock_irqsave(&info->lock,flags);
1744         info->tx_count = info->tx_put = info->tx_get = 0;
1745         del_timer(&info->tx_timer);
1746         spin_unlock_irqrestore(&info->lock,flags);
1747
1748         wake_up_interruptible(&tty->write_wait);
1749         tty_wakeup(tty);
1750 }
1751
1752 /* Send a high-priority XON/XOFF character
1753  */
1754 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1755 {
1756         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1757         unsigned long flags;
1758
1759         if (debug_level >= DEBUG_LEVEL_INFO)
1760                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1761                          __FILE__,__LINE__, info->device_name, ch );
1762
1763         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1764                 return;
1765
1766         info->x_char = ch;
1767         if (ch) {
1768                 spin_lock_irqsave(&info->lock,flags);
1769                 if (!info->tx_enabled)
1770                         tx_start(info);
1771                 spin_unlock_irqrestore(&info->lock,flags);
1772         }
1773 }
1774
1775 /* Signal remote device to throttle send data (our receive data)
1776  */
1777 static void mgslpc_throttle(struct tty_struct * tty)
1778 {
1779         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1780         unsigned long flags;
1781
1782         if (debug_level >= DEBUG_LEVEL_INFO)
1783                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1784                          __FILE__,__LINE__, info->device_name );
1785
1786         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1787                 return;
1788
1789         if (I_IXOFF(tty))
1790                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1791
1792         if (tty->termios->c_cflag & CRTSCTS) {
1793                 spin_lock_irqsave(&info->lock,flags);
1794                 info->serial_signals &= ~SerialSignal_RTS;
1795                 set_signals(info);
1796                 spin_unlock_irqrestore(&info->lock,flags);
1797         }
1798 }
1799
1800 /* Signal remote device to stop throttling send data (our receive data)
1801  */
1802 static void mgslpc_unthrottle(struct tty_struct * tty)
1803 {
1804         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1805         unsigned long flags;
1806
1807         if (debug_level >= DEBUG_LEVEL_INFO)
1808                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1809                          __FILE__,__LINE__, info->device_name );
1810
1811         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1812                 return;
1813
1814         if (I_IXOFF(tty)) {
1815                 if (info->x_char)
1816                         info->x_char = 0;
1817                 else
1818                         mgslpc_send_xchar(tty, START_CHAR(tty));
1819         }
1820
1821         if (tty->termios->c_cflag & CRTSCTS) {
1822                 spin_lock_irqsave(&info->lock,flags);
1823                 info->serial_signals |= SerialSignal_RTS;
1824                 set_signals(info);
1825                 spin_unlock_irqrestore(&info->lock,flags);
1826         }
1827 }
1828
1829 /* get the current serial statistics
1830  */
1831 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1832 {
1833         int err;
1834         if (debug_level >= DEBUG_LEVEL_INFO)
1835                 printk("get_params(%s)\n", info->device_name);
1836         if (!user_icount) {
1837                 memset(&info->icount, 0, sizeof(info->icount));
1838         } else {
1839                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1840                 if (err)
1841                         return -EFAULT;
1842         }
1843         return 0;
1844 }
1845
1846 /* get the current serial parameters
1847  */
1848 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1849 {
1850         int err;
1851         if (debug_level >= DEBUG_LEVEL_INFO)
1852                 printk("get_params(%s)\n", info->device_name);
1853         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1854         if (err)
1855                 return -EFAULT;
1856         return 0;
1857 }
1858
1859 /* set the serial parameters
1860  *
1861  * Arguments:
1862  *
1863  *      info            pointer to device instance data
1864  *      new_params      user buffer containing new serial params
1865  *
1866  * Returns:     0 if success, otherwise error code
1867  */
1868 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params)
1869 {
1870         unsigned long flags;
1871         MGSL_PARAMS tmp_params;
1872         int err;
1873
1874         if (debug_level >= DEBUG_LEVEL_INFO)
1875                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1876                         info->device_name );
1877         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1878         if (err) {
1879                 if ( debug_level >= DEBUG_LEVEL_INFO )
1880                         printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1881                                 __FILE__,__LINE__,info->device_name);
1882                 return -EFAULT;
1883         }
1884
1885         spin_lock_irqsave(&info->lock,flags);
1886         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1887         spin_unlock_irqrestore(&info->lock,flags);
1888
1889         mgslpc_change_params(info);
1890
1891         return 0;
1892 }
1893
1894 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1895 {
1896         int err;
1897         if (debug_level >= DEBUG_LEVEL_INFO)
1898                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1899         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1900         if (err)
1901                 return -EFAULT;
1902         return 0;
1903 }
1904
1905 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1906 {
1907         unsigned long flags;
1908         if (debug_level >= DEBUG_LEVEL_INFO)
1909                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1910         spin_lock_irqsave(&info->lock,flags);
1911         info->idle_mode = idle_mode;
1912         tx_set_idle(info);
1913         spin_unlock_irqrestore(&info->lock,flags);
1914         return 0;
1915 }
1916
1917 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1918 {
1919         int err;
1920         if (debug_level >= DEBUG_LEVEL_INFO)
1921                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1922         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1923         if (err)
1924                 return -EFAULT;
1925         return 0;
1926 }
1927
1928 static int set_interface(MGSLPC_INFO * info, int if_mode)
1929 {
1930         unsigned long flags;
1931         unsigned char val;
1932         if (debug_level >= DEBUG_LEVEL_INFO)
1933                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1934         spin_lock_irqsave(&info->lock,flags);
1935         info->if_mode = if_mode;
1936
1937         val = read_reg(info, PVR) & 0x0f;
1938         switch (info->if_mode)
1939         {
1940         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1941         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1942         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1943         }
1944         write_reg(info, PVR, val);
1945
1946         spin_unlock_irqrestore(&info->lock,flags);
1947         return 0;
1948 }
1949
1950 static int set_txenable(MGSLPC_INFO * info, int enable)
1951 {
1952         unsigned long flags;
1953
1954         if (debug_level >= DEBUG_LEVEL_INFO)
1955                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1956
1957         spin_lock_irqsave(&info->lock,flags);
1958         if (enable) {
1959                 if (!info->tx_enabled)
1960                         tx_start(info);
1961         } else {
1962                 if (info->tx_enabled)
1963                         tx_stop(info);
1964         }
1965         spin_unlock_irqrestore(&info->lock,flags);
1966         return 0;
1967 }
1968
1969 static int tx_abort(MGSLPC_INFO * info)
1970 {
1971         unsigned long flags;
1972
1973         if (debug_level >= DEBUG_LEVEL_INFO)
1974                 printk("tx_abort(%s)\n", info->device_name);
1975
1976         spin_lock_irqsave(&info->lock,flags);
1977         if (info->tx_active && info->tx_count &&
1978             info->params.mode == MGSL_MODE_HDLC) {
1979                 /* clear data count so FIFO is not filled on next IRQ.
1980                  * This results in underrun and abort transmission.
1981                  */
1982                 info->tx_count = info->tx_put = info->tx_get = 0;
1983                 info->tx_aborting = true;
1984         }
1985         spin_unlock_irqrestore(&info->lock,flags);
1986         return 0;
1987 }
1988
1989 static int set_rxenable(MGSLPC_INFO * info, int enable)
1990 {
1991         unsigned long flags;
1992
1993         if (debug_level >= DEBUG_LEVEL_INFO)
1994                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1995
1996         spin_lock_irqsave(&info->lock,flags);
1997         if (enable) {
1998                 if (!info->rx_enabled)
1999                         rx_start(info);
2000         } else {
2001                 if (info->rx_enabled)
2002                         rx_stop(info);
2003         }
2004         spin_unlock_irqrestore(&info->lock,flags);
2005         return 0;
2006 }
2007
2008 /* wait for specified event to occur
2009  *
2010  * Arguments:           info    pointer to device instance data
2011  *                      mask    pointer to bitmask of events to wait for
2012  * Return Value:        0       if successful and bit mask updated with
2013  *                              of events triggerred,
2014  *                      otherwise error code
2015  */
2016 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
2017 {
2018         unsigned long flags;
2019         int s;
2020         int rc=0;
2021         struct mgsl_icount cprev, cnow;
2022         int events;
2023         int mask;
2024         struct  _input_signal_events oldsigs, newsigs;
2025         DECLARE_WAITQUEUE(wait, current);
2026
2027         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2028         if (rc)
2029                 return  -EFAULT;
2030
2031         if (debug_level >= DEBUG_LEVEL_INFO)
2032                 printk("wait_events(%s,%d)\n", info->device_name, mask);
2033
2034         spin_lock_irqsave(&info->lock,flags);
2035
2036         /* return immediately if state matches requested events */
2037         get_signals(info);
2038         s = info->serial_signals;
2039         events = mask &
2040                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2041                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2042                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2043                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2044         if (events) {
2045                 spin_unlock_irqrestore(&info->lock,flags);
2046                 goto exit;
2047         }
2048
2049         /* save current irq counts */
2050         cprev = info->icount;
2051         oldsigs = info->input_signal_events;
2052
2053         if ((info->params.mode == MGSL_MODE_HDLC) &&
2054             (mask & MgslEvent_ExitHuntMode))
2055                 irq_enable(info, CHA, IRQ_EXITHUNT);
2056
2057         set_current_state(TASK_INTERRUPTIBLE);
2058         add_wait_queue(&info->event_wait_q, &wait);
2059
2060         spin_unlock_irqrestore(&info->lock,flags);
2061
2062
2063         for(;;) {
2064                 schedule();
2065                 if (signal_pending(current)) {
2066                         rc = -ERESTARTSYS;
2067                         break;
2068                 }
2069
2070                 /* get current irq counts */
2071                 spin_lock_irqsave(&info->lock,flags);
2072                 cnow = info->icount;
2073                 newsigs = info->input_signal_events;
2074                 set_current_state(TASK_INTERRUPTIBLE);
2075                 spin_unlock_irqrestore(&info->lock,flags);
2076
2077                 /* if no change, wait aborted for some reason */
2078                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2079                     newsigs.dsr_down == oldsigs.dsr_down &&
2080                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2081                     newsigs.dcd_down == oldsigs.dcd_down &&
2082                     newsigs.cts_up   == oldsigs.cts_up   &&
2083                     newsigs.cts_down == oldsigs.cts_down &&
2084                     newsigs.ri_up    == oldsigs.ri_up    &&
2085                     newsigs.ri_down  == oldsigs.ri_down  &&
2086                     cnow.exithunt    == cprev.exithunt   &&
2087                     cnow.rxidle      == cprev.rxidle) {
2088                         rc = -EIO;
2089                         break;
2090                 }
2091
2092                 events = mask &
2093                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2094                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2095                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2096                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2097                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2098                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2099                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2100                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2101                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2102                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2103                 if (events)
2104                         break;
2105
2106                 cprev = cnow;
2107                 oldsigs = newsigs;
2108         }
2109
2110         remove_wait_queue(&info->event_wait_q, &wait);
2111         set_current_state(TASK_RUNNING);
2112
2113         if (mask & MgslEvent_ExitHuntMode) {
2114                 spin_lock_irqsave(&info->lock,flags);
2115                 if (!waitqueue_active(&info->event_wait_q))
2116                         irq_disable(info, CHA, IRQ_EXITHUNT);
2117                 spin_unlock_irqrestore(&info->lock,flags);
2118         }
2119 exit:
2120         if (rc == 0)
2121                 PUT_USER(rc, events, mask_ptr);
2122         return rc;
2123 }
2124
2125 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2126 {
2127         unsigned long flags;
2128         int rc;
2129         struct mgsl_icount cprev, cnow;
2130         DECLARE_WAITQUEUE(wait, current);
2131
2132         /* save current irq counts */
2133         spin_lock_irqsave(&info->lock,flags);
2134         cprev = info->icount;
2135         add_wait_queue(&info->status_event_wait_q, &wait);
2136         set_current_state(TASK_INTERRUPTIBLE);
2137         spin_unlock_irqrestore(&info->lock,flags);
2138
2139         for(;;) {
2140                 schedule();
2141                 if (signal_pending(current)) {
2142                         rc = -ERESTARTSYS;
2143                         break;
2144                 }
2145
2146                 /* get new irq counts */
2147                 spin_lock_irqsave(&info->lock,flags);
2148                 cnow = info->icount;
2149                 set_current_state(TASK_INTERRUPTIBLE);
2150                 spin_unlock_irqrestore(&info->lock,flags);
2151
2152                 /* if no change, wait aborted for some reason */
2153                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2154                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2155                         rc = -EIO;
2156                         break;
2157                 }
2158
2159                 /* check for change in caller specified modem input */
2160                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2161                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2162                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2163                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2164                         rc = 0;
2165                         break;
2166                 }
2167
2168                 cprev = cnow;
2169         }
2170         remove_wait_queue(&info->status_event_wait_q, &wait);
2171         set_current_state(TASK_RUNNING);
2172         return rc;
2173 }
2174
2175 /* return the state of the serial control and status signals
2176  */
2177 static int tiocmget(struct tty_struct *tty, struct file *file)
2178 {
2179         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2180         unsigned int result;
2181         unsigned long flags;
2182
2183         spin_lock_irqsave(&info->lock,flags);
2184         get_signals(info);
2185         spin_unlock_irqrestore(&info->lock,flags);
2186
2187         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2188                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2189                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2190                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2191                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2192                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2193
2194         if (debug_level >= DEBUG_LEVEL_INFO)
2195                 printk("%s(%d):%s tiocmget() value=%08X\n",
2196                          __FILE__,__LINE__, info->device_name, result );
2197         return result;
2198 }
2199
2200 /* set modem control signals (DTR/RTS)
2201  */
2202 static int tiocmset(struct tty_struct *tty, struct file *file,
2203                     unsigned int set, unsigned int clear)
2204 {
2205         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2206         unsigned long flags;
2207
2208         if (debug_level >= DEBUG_LEVEL_INFO)
2209                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2210                         __FILE__,__LINE__,info->device_name, set, clear);
2211
2212         if (set & TIOCM_RTS)
2213                 info->serial_signals |= SerialSignal_RTS;
2214         if (set & TIOCM_DTR)
2215                 info->serial_signals |= SerialSignal_DTR;
2216         if (clear & TIOCM_RTS)
2217                 info->serial_signals &= ~SerialSignal_RTS;
2218         if (clear & TIOCM_DTR)
2219                 info->serial_signals &= ~SerialSignal_DTR;
2220
2221         spin_lock_irqsave(&info->lock,flags);
2222         set_signals(info);
2223         spin_unlock_irqrestore(&info->lock,flags);
2224
2225         return 0;
2226 }
2227
2228 /* Set or clear transmit break condition
2229  *
2230  * Arguments:           tty             pointer to tty instance data
2231  *                      break_state     -1=set break condition, 0=clear
2232  */
2233 static void mgslpc_break(struct tty_struct *tty, int break_state)
2234 {
2235         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2236         unsigned long flags;
2237
2238         if (debug_level >= DEBUG_LEVEL_INFO)
2239                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2240                          __FILE__,__LINE__, info->device_name, break_state);
2241
2242         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2243                 return;
2244
2245         spin_lock_irqsave(&info->lock,flags);
2246         if (break_state == -1)
2247                 set_reg_bits(info, CHA+DAFO, BIT6);
2248         else
2249                 clear_reg_bits(info, CHA+DAFO, BIT6);
2250         spin_unlock_irqrestore(&info->lock,flags);
2251 }
2252
2253 /* Service an IOCTL request
2254  *
2255  * Arguments:
2256  *
2257  *      tty     pointer to tty instance data
2258  *      file    pointer to associated file object for device
2259  *      cmd     IOCTL command code
2260  *      arg     command argument/context
2261  *
2262  * Return Value:        0 if success, otherwise error code
2263  */
2264 static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
2265                         unsigned int cmd, unsigned long arg)
2266 {
2267         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2268
2269         if (debug_level >= DEBUG_LEVEL_INFO)
2270                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2271                         info->device_name, cmd );
2272
2273         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2274                 return -ENODEV;
2275
2276         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2277             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2278                 if (tty->flags & (1 << TTY_IO_ERROR))
2279                     return -EIO;
2280         }
2281
2282         return ioctl_common(info, cmd, arg);
2283 }
2284
2285 static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg)
2286 {
2287         int error;
2288         struct mgsl_icount cnow;        /* kernel counter temps */
2289         struct serial_icounter_struct __user *p_cuser;  /* user space */
2290         void __user *argp = (void __user *)arg;
2291         unsigned long flags;
2292
2293         switch (cmd) {
2294         case MGSL_IOCGPARAMS:
2295                 return get_params(info, argp);
2296         case MGSL_IOCSPARAMS:
2297                 return set_params(info, argp);
2298         case MGSL_IOCGTXIDLE:
2299                 return get_txidle(info, argp);
2300         case MGSL_IOCSTXIDLE:
2301                 return set_txidle(info, (int)arg);
2302         case MGSL_IOCGIF:
2303                 return get_interface(info, argp);
2304         case MGSL_IOCSIF:
2305                 return set_interface(info,(int)arg);
2306         case MGSL_IOCTXENABLE:
2307                 return set_txenable(info,(int)arg);
2308         case MGSL_IOCRXENABLE:
2309                 return set_rxenable(info,(int)arg);
2310         case MGSL_IOCTXABORT:
2311                 return tx_abort(info);
2312         case MGSL_IOCGSTATS:
2313                 return get_stats(info, argp);
2314         case MGSL_IOCWAITEVENT:
2315                 return wait_events(info, argp);
2316         case TIOCMIWAIT:
2317                 return modem_input_wait(info,(int)arg);
2318         case TIOCGICOUNT:
2319                 spin_lock_irqsave(&info->lock,flags);
2320                 cnow = info->icount;
2321                 spin_unlock_irqrestore(&info->lock,flags);
2322                 p_cuser = argp;
2323                 PUT_USER(error,cnow.cts, &p_cuser->cts);
2324                 if (error) return error;
2325                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
2326                 if (error) return error;
2327                 PUT_USER(error,cnow.rng, &p_cuser->rng);
2328                 if (error) return error;
2329                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
2330                 if (error) return error;
2331                 PUT_USER(error,cnow.rx, &p_cuser->rx);
2332                 if (error) return error;
2333                 PUT_USER(error,cnow.tx, &p_cuser->tx);
2334                 if (error) return error;
2335                 PUT_USER(error,cnow.frame, &p_cuser->frame);
2336                 if (error) return error;
2337                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
2338                 if (error) return error;
2339                 PUT_USER(error,cnow.parity, &p_cuser->parity);
2340                 if (error) return error;
2341                 PUT_USER(error,cnow.brk, &p_cuser->brk);
2342                 if (error) return error;
2343                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
2344                 if (error) return error;
2345                 return 0;
2346         default:
2347                 return -ENOIOCTLCMD;
2348         }
2349         return 0;
2350 }
2351
2352 /* Set new termios settings
2353  *
2354  * Arguments:
2355  *
2356  *      tty             pointer to tty structure
2357  *      termios         pointer to buffer to hold returned old termios
2358  */
2359 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2360 {
2361         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2362         unsigned long flags;
2363
2364         if (debug_level >= DEBUG_LEVEL_INFO)
2365                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2366                         tty->driver->name );
2367
2368         /* just return if nothing has changed */
2369         if ((tty->termios->c_cflag == old_termios->c_cflag)
2370             && (RELEVANT_IFLAG(tty->termios->c_iflag)
2371                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2372           return;
2373
2374         mgslpc_change_params(info);
2375
2376         /* Handle transition to B0 status */
2377         if (old_termios->c_cflag & CBAUD &&
2378             !(tty->termios->c_cflag & CBAUD)) {
2379                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2380                 spin_lock_irqsave(&info->lock,flags);
2381                 set_signals(info);
2382                 spin_unlock_irqrestore(&info->lock,flags);
2383         }
2384
2385         /* Handle transition away from B0 status */
2386         if (!(old_termios->c_cflag & CBAUD) &&
2387             tty->termios->c_cflag & CBAUD) {
2388                 info->serial_signals |= SerialSignal_DTR;
2389                 if (!(tty->termios->c_cflag & CRTSCTS) ||
2390                     !test_bit(TTY_THROTTLED, &tty->flags)) {
2391                         info->serial_signals |= SerialSignal_RTS;
2392                 }
2393                 spin_lock_irqsave(&info->lock,flags);
2394                 set_signals(info);
2395                 spin_unlock_irqrestore(&info->lock,flags);
2396         }
2397
2398         /* Handle turning off CRTSCTS */
2399         if (old_termios->c_cflag & CRTSCTS &&
2400             !(tty->termios->c_cflag & CRTSCTS)) {
2401                 tty->hw_stopped = 0;
2402                 tx_release(tty);
2403         }
2404 }
2405
2406 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2407 {
2408         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2409
2410         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2411                 return;
2412
2413         if (debug_level >= DEBUG_LEVEL_INFO)
2414                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2415                          __FILE__,__LINE__, info->device_name, info->count);
2416
2417         if (!info->count)
2418                 return;
2419
2420         if (tty_hung_up_p(filp))
2421                 goto cleanup;
2422
2423         if ((tty->count == 1) && (info->count != 1)) {
2424                 /*
2425                  * tty->count is 1 and the tty structure will be freed.
2426                  * info->count should be one in this case.
2427                  * if it's not, correct it so that the port is shutdown.
2428                  */
2429                 printk("mgslpc_close: bad refcount; tty->count is 1, "
2430                        "info->count is %d\n", info->count);
2431                 info->count = 1;
2432         }
2433
2434         info->count--;
2435
2436         /* if at least one open remaining, leave hardware active */
2437         if (info->count)
2438                 goto cleanup;
2439
2440         info->flags |= ASYNC_CLOSING;
2441
2442         /* set tty->closing to notify line discipline to
2443          * only process XON/XOFF characters. Only the N_TTY
2444          * discipline appears to use this (ppp does not).
2445          */
2446         tty->closing = 1;
2447
2448         /* wait for transmit data to clear all layers */
2449
2450         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
2451                 if (debug_level >= DEBUG_LEVEL_INFO)
2452                         printk("%s(%d):mgslpc_close(%s) calling tty_wait_until_sent\n",
2453                                  __FILE__,__LINE__, info->device_name );
2454                 tty_wait_until_sent(tty, info->closing_wait);
2455         }
2456
2457         if (info->flags & ASYNC_INITIALIZED)
2458                 mgslpc_wait_until_sent(tty, info->timeout);
2459
2460         mgslpc_flush_buffer(tty);
2461
2462         tty_ldisc_flush(tty);
2463
2464         shutdown(info);
2465
2466         tty->closing = 0;
2467         info->tty = NULL;
2468
2469         if (info->blocked_open) {
2470                 if (info->close_delay) {
2471                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
2472                 }
2473                 wake_up_interruptible(&info->open_wait);
2474         }
2475
2476         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2477
2478         wake_up_interruptible(&info->close_wait);
2479
2480 cleanup:
2481         if (debug_level >= DEBUG_LEVEL_INFO)
2482                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2483                         tty->driver->name, info->count);
2484 }
2485
2486 /* Wait until the transmitter is empty.
2487  */
2488 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2489 {
2490         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2491         unsigned long orig_jiffies, char_time;
2492
2493         if (!info )
2494                 return;
2495
2496         if (debug_level >= DEBUG_LEVEL_INFO)
2497                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2498                          __FILE__,__LINE__, info->device_name );
2499
2500         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2501                 return;
2502
2503         if (!(info->flags & ASYNC_INITIALIZED))
2504                 goto exit;
2505
2506         orig_jiffies = jiffies;
2507
2508         /* Set check interval to 1/5 of estimated time to
2509          * send a character, and make it at least 1. The check
2510          * interval should also be less than the timeout.
2511          * Note: use tight timings here to satisfy the NIST-PCTS.
2512          */
2513
2514         if ( info->params.data_rate ) {
2515                 char_time = info->timeout/(32 * 5);
2516                 if (!char_time)
2517                         char_time++;
2518         } else
2519                 char_time = 1;
2520
2521         if (timeout)
2522                 char_time = min_t(unsigned long, char_time, timeout);
2523
2524         if (info->params.mode == MGSL_MODE_HDLC) {
2525                 while (info->tx_active) {
2526                         msleep_interruptible(jiffies_to_msecs(char_time));
2527                         if (signal_pending(current))
2528                                 break;
2529                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2530                                 break;
2531                 }
2532         } else {
2533                 while ((info->tx_count || info->tx_active) &&
2534                         info->tx_enabled) {
2535                         msleep_interruptible(jiffies_to_msecs(char_time));
2536                         if (signal_pending(current))
2537                                 break;
2538                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2539                                 break;
2540                 }
2541         }
2542
2543 exit:
2544         if (debug_level >= DEBUG_LEVEL_INFO)
2545                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2546                          __FILE__,__LINE__, info->device_name );
2547 }
2548
2549 /* Called by tty_hangup() when a hangup is signaled.
2550  * This is the same as closing all open files for the port.
2551  */
2552 static void mgslpc_hangup(struct tty_struct *tty)
2553 {
2554         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2555
2556         if (debug_level >= DEBUG_LEVEL_INFO)
2557                 printk("%s(%d):mgslpc_hangup(%s)\n",
2558                          __FILE__,__LINE__, info->device_name );
2559
2560         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2561                 return;
2562
2563         mgslpc_flush_buffer(tty);
2564         shutdown(info);
2565
2566         info->count = 0;
2567         info->flags &= ~ASYNC_NORMAL_ACTIVE;
2568         info->tty = NULL;
2569
2570         wake_up_interruptible(&info->open_wait);
2571 }
2572
2573 /* Block the current process until the specified port
2574  * is ready to be opened.
2575  */
2576 static int block_til_ready(struct tty_struct *tty, struct file *filp,
2577                            MGSLPC_INFO *info)
2578 {
2579         DECLARE_WAITQUEUE(wait, current);
2580         int             retval;
2581         bool            do_clocal = false;
2582         bool            extra_count = false;
2583         unsigned long   flags;
2584
2585         if (debug_level >= DEBUG_LEVEL_INFO)
2586                 printk("%s(%d):block_til_ready on %s\n",
2587                          __FILE__,__LINE__, tty->driver->name );
2588
2589         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
2590                 /* nonblock mode is set or port is not enabled */
2591                 /* just verify that callout device is not active */
2592                 info->flags |= ASYNC_NORMAL_ACTIVE;
2593                 return 0;
2594         }
2595
2596         if (tty->termios->c_cflag & CLOCAL)
2597                 do_clocal = true;
2598
2599         /* Wait for carrier detect and the line to become
2600          * free (i.e., not in use by the callout).  While we are in
2601          * this loop, info->count is dropped by one, so that
2602          * mgslpc_close() knows when to free things.  We restore it upon
2603          * exit, either normal or abnormal.
2604          */
2605
2606         retval = 0;
2607         add_wait_queue(&info->open_wait, &wait);
2608
2609         if (debug_level >= DEBUG_LEVEL_INFO)
2610                 printk("%s(%d):block_til_ready before block on %s count=%d\n",
2611                          __FILE__,__LINE__, tty->driver->name, info->count );
2612
2613         spin_lock_irqsave(&info->lock, flags);
2614         if (!tty_hung_up_p(filp)) {
2615                 extra_count = true;
2616                 info->count--;
2617         }
2618         spin_unlock_irqrestore(&info->lock, flags);
2619         info->blocked_open++;
2620
2621         while (1) {
2622                 if ((tty->termios->c_cflag & CBAUD)) {
2623                         spin_lock_irqsave(&info->lock,flags);
2624                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2625                         set_signals(info);
2626                         spin_unlock_irqrestore(&info->lock,flags);
2627                 }
2628
2629                 set_current_state(TASK_INTERRUPTIBLE);
2630
2631                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
2632                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
2633                                         -EAGAIN : -ERESTARTSYS;
2634                         break;
2635                 }
2636
2637                 spin_lock_irqsave(&info->lock,flags);
2638                 get_signals(info);
2639                 spin_unlock_irqrestore(&info->lock,flags);
2640
2641                 if (!(info->flags & ASYNC_CLOSING) &&
2642                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
2643                         break;
2644                 }
2645
2646                 if (signal_pending(current)) {
2647                         retval = -ERESTARTSYS;
2648                         break;
2649                 }
2650
2651                 if (debug_level >= DEBUG_LEVEL_INFO)
2652                         printk("%s(%d):block_til_ready blocking on %s count=%d\n",
2653                                  __FILE__,__LINE__, tty->driver->name, info->count );
2654
2655                 schedule();
2656         }
2657
2658         set_current_state(TASK_RUNNING);
2659         remove_wait_queue(&info->open_wait, &wait);
2660
2661         if (extra_count)
2662                 info->count++;
2663         info->blocked_open--;
2664
2665         if (debug_level >= DEBUG_LEVEL_INFO)
2666                 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
2667                          __FILE__,__LINE__, tty->driver->name, info->count );
2668
2669         if (!retval)
2670                 info->flags |= ASYNC_NORMAL_ACTIVE;
2671
2672         return retval;
2673 }
2674
2675 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2676 {
2677         MGSLPC_INFO     *info;
2678         int                     retval, line;
2679         unsigned long flags;
2680
2681         /* verify range of specified line number */
2682         line = tty->index;
2683         if ((line < 0) || (line >= mgslpc_device_count)) {
2684                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2685                         __FILE__,__LINE__,line);
2686                 return -ENODEV;
2687         }
2688
2689         /* find the info structure for the specified line */
2690         info = mgslpc_device_list;
2691         while(info && info->line != line)
2692                 info = info->next_device;
2693         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2694                 return -ENODEV;
2695
2696         tty->driver_data = info;
2697         info->tty = tty;
2698
2699         if (debug_level >= DEBUG_LEVEL_INFO)
2700                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2701                          __FILE__,__LINE__,tty->driver->name, info->count);
2702
2703         /* If port is closing, signal caller to try again */
2704         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
2705                 if (info->flags & ASYNC_CLOSING)
2706                         interruptible_sleep_on(&info->close_wait);
2707                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
2708                         -EAGAIN : -ERESTARTSYS);
2709                 goto cleanup;
2710         }
2711
2712         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2713
2714         spin_lock_irqsave(&info->netlock, flags);
2715         if (info->netcount) {
2716                 retval = -EBUSY;
2717                 spin_unlock_irqrestore(&info->netlock, flags);
2718                 goto cleanup;
2719         }
2720         info->count++;
2721         spin_unlock_irqrestore(&info->netlock, flags);
2722
2723         if (info->count == 1) {
2724                 /* 1st open on this device, init hardware */
2725                 retval = startup(info);
2726                 if (retval < 0)
2727                         goto cleanup;
2728         }
2729
2730         retval = block_til_ready(tty, filp, info);
2731         if (retval) {
2732                 if (debug_level >= DEBUG_LEVEL_INFO)
2733                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2734                                  __FILE__,__LINE__, info->device_name, retval);
2735                 goto cleanup;
2736         }
2737
2738         if (debug_level >= DEBUG_LEVEL_INFO)
2739                 printk("%s(%d):mgslpc_open(%s) success\n",
2740                          __FILE__,__LINE__, info->device_name);
2741         retval = 0;
2742
2743 cleanup:
2744         if (retval) {
2745                 if (tty->count == 1)
2746                         info->tty = NULL; /* tty layer will release tty struct */
2747                 if(info->count)
2748                         info->count--;
2749         }
2750
2751         return retval;
2752 }
2753
2754 /*
2755  * /proc fs routines....
2756  */
2757
2758 static inline int line_info(char *buf, MGSLPC_INFO *info)
2759 {
2760         char    stat_buf[30];
2761         int     ret;
2762         unsigned long flags;
2763
2764         ret = sprintf(buf, "%s:io:%04X irq:%d",
2765                       info->device_name, info->io_base, info->irq_level);
2766
2767         /* output current serial signal states */
2768         spin_lock_irqsave(&info->lock,flags);
2769         get_signals(info);
2770         spin_unlock_irqrestore(&info->lock,flags);
2771
2772         stat_buf[0] = 0;
2773         stat_buf[1] = 0;
2774         if (info->serial_signals & SerialSignal_RTS)
2775                 strcat(stat_buf, "|RTS");
2776         if (info->serial_signals & SerialSignal_CTS)
2777                 strcat(stat_buf, "|CTS");
2778         if (info->serial_signals & SerialSignal_DTR)
2779                 strcat(stat_buf, "|DTR");
2780         if (info->serial_signals & SerialSignal_DSR)
2781                 strcat(stat_buf, "|DSR");
2782         if (info->serial_signals & SerialSignal_DCD)
2783                 strcat(stat_buf, "|CD");
2784         if (info->serial_signals & SerialSignal_RI)
2785                 strcat(stat_buf, "|RI");
2786
2787         if (info->params.mode == MGSL_MODE_HDLC) {
2788                 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
2789                               info->icount.txok, info->icount.rxok);
2790                 if (info->icount.txunder)
2791                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
2792                 if (info->icount.txabort)
2793                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
2794                 if (info->icount.rxshort)
2795                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
2796                 if (info->icount.rxlong)
2797                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
2798                 if (info->icount.rxover)
2799                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
2800                 if (info->icount.rxcrc)
2801                         ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
2802         } else {
2803                 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
2804                               info->icount.tx, info->icount.rx);
2805                 if (info->icount.frame)
2806                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
2807                 if (info->icount.parity)
2808                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
2809                 if (info->icount.brk)
2810                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
2811                 if (info->icount.overrun)
2812                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
2813         }
2814
2815         /* Append serial signal status to end */
2816         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
2817
2818         ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2819                        info->tx_active,info->bh_requested,info->bh_running,
2820                        info->pending_bh);
2821
2822         return ret;
2823 }
2824
2825 /* Called to print information about devices
2826  */
2827 static int mgslpc_read_proc(char *page, char **start, off_t off, int count,
2828                  int *eof, void *data)
2829 {
2830         int len = 0, l;
2831         off_t   begin = 0;
2832         MGSLPC_INFO *info;
2833
2834         len += sprintf(page, "synclink driver:%s\n", driver_version);
2835
2836         info = mgslpc_device_list;
2837         while( info ) {
2838                 l = line_info(page + len, info);
2839                 len += l;
2840                 if (len+begin > off+count)
2841                         goto done;
2842                 if (len+begin < off) {
2843                         begin += len;
2844                         len = 0;
2845                 }
2846                 info = info->next_device;
2847         }
2848
2849         *eof = 1;
2850 done:
2851         if (off >= len+begin)
2852                 return 0;
2853         *start = page + (off-begin);
2854         return ((count < begin+len-off) ? count : begin+len-off);
2855 }
2856
2857 static int rx_alloc_buffers(MGSLPC_INFO *info)
2858 {
2859         /* each buffer has header and data */
2860         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2861
2862         /* calculate total allocation size for 8 buffers */
2863         info->rx_buf_total_size = info->rx_buf_size * 8;
2864
2865         /* limit total allocated memory */
2866         if (info->rx_buf_total_size > 0x10000)
2867                 info->rx_buf_total_size = 0x10000;
2868
2869         /* calculate number of buffers */
2870         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2871
2872         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2873         if (info->rx_buf == NULL)
2874                 return -ENOMEM;
2875
2876         rx_reset_buffers(info);
2877         return 0;
2878 }
2879
2880 static void rx_free_buffers(MGSLPC_INFO *info)
2881 {
2882         kfree(info->rx_buf);
2883         info->rx_buf = NULL;
2884 }
2885
2886 static int claim_resources(MGSLPC_INFO *info)
2887 {
2888         if (rx_alloc_buffers(info) < 0 ) {
2889                 printk( "Cant allocate rx buffer %s\n", info->device_name);
2890                 release_resources(info);
2891                 return -ENODEV;
2892         }
2893         return 0;
2894 }
2895
2896 static void release_resources(MGSLPC_INFO *info)
2897 {
2898         if (debug_level >= DEBUG_LEVEL_INFO)
2899                 printk("release_resources(%s)\n", info->device_name);
2900         rx_free_buffers(info);
2901 }
2902
2903 /* Add the specified device instance data structure to the
2904  * global linked list of devices and increment the device count.
2905  *
2906  * Arguments:           info    pointer to device instance data
2907  */
2908 static void mgslpc_add_device(MGSLPC_INFO *info)
2909 {
2910         info->next_device = NULL;
2911         info->line = mgslpc_device_count;
2912         sprintf(info->device_name,"ttySLP%d",info->line);
2913
2914         if (info->line < MAX_DEVICE_COUNT) {
2915                 if (maxframe[info->line])
2916                         info->max_frame_size = maxframe[info->line];
2917                 info->dosyncppp = dosyncppp[info->line];
2918         }
2919
2920         mgslpc_device_count++;
2921
2922         if (!mgslpc_device_list)
2923                 mgslpc_device_list = info;
2924         else {
2925                 MGSLPC_INFO *current_dev = mgslpc_device_list;
2926                 while( current_dev->next_device )
2927                         current_dev = current_dev->next_device;
2928                 current_dev->next_device = info;
2929         }
2930
2931         if (info->max_frame_size < 4096)
2932                 info->max_frame_size = 4096;
2933         else if (info->max_frame_size > 65535)
2934                 info->max_frame_size = 65535;
2935
2936         printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2937                 info->device_name, info->io_base, info->irq_level);
2938
2939 #if SYNCLINK_GENERIC_HDLC
2940         hdlcdev_init(info);
2941 #endif
2942 }
2943
2944 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2945 {
2946         MGSLPC_INFO *info = mgslpc_device_list;
2947         MGSLPC_INFO *last = NULL;
2948
2949         while(info) {
2950                 if (info == remove_info) {
2951                         if (last)
2952                                 last->next_device = info->next_device;
2953                         else
2954                                 mgslpc_device_list = info->next_device;
2955 #if SYNCLINK_GENERIC_HDLC
2956                         hdlcdev_exit(info);
2957 #endif
2958                         release_resources(info);
2959                         kfree(info);
2960                         mgslpc_device_count--;
2961                         return;
2962                 }
2963                 last = info;
2964                 info = info->next_device;
2965         }
2966 }
2967
2968 static struct pcmcia_device_id mgslpc_ids[] = {
2969         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2970         PCMCIA_DEVICE_NULL
2971 };
2972 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2973
2974 static struct pcmcia_driver mgslpc_driver = {
2975         .owner          = THIS_MODULE,
2976         .drv            = {
2977                 .name   = "synclink_cs",
2978         },
2979         .probe          = mgslpc_probe,
2980         .remove         = mgslpc_detach,
2981         .id_table       = mgslpc_ids,
2982         .suspend        = mgslpc_suspend,
2983         .resume         = mgslpc_resume,
2984 };
2985
2986 static const struct tty_operations mgslpc_ops = {
2987         .open = mgslpc_open,
2988         .close = mgslpc_close,
2989         .write = mgslpc_write,
2990         .put_char = mgslpc_put_char,
2991         .flush_chars = mgslpc_flush_chars,
2992         .write_room = mgslpc_write_room,
2993         .chars_in_buffer = mgslpc_chars_in_buffer,
2994         .flush_buffer = mgslpc_flush_buffer,
2995         .ioctl = mgslpc_ioctl,
2996         .throttle = mgslpc_throttle,
2997         .unthrottle = mgslpc_unthrottle,
2998         .send_xchar = mgslpc_send_xchar,
2999         .break_ctl = mgslpc_break,
3000         .wait_until_sent = mgslpc_wait_until_sent,
3001         .read_proc = mgslpc_read_proc,
3002         .set_termios = mgslpc_set_termios,
3003         .stop = tx_pause,
3004         .start = tx_release,
3005         .hangup = mgslpc_hangup,
3006         .tiocmget = tiocmget,
3007         .tiocmset = tiocmset,
3008 };
3009
3010 static void synclink_cs_cleanup(void)
3011 {
3012         int rc;
3013
3014         printk("Unloading %s: version %s\n", driver_name, driver_version);
3015
3016         while(mgslpc_device_list)
3017                 mgslpc_remove_device(mgslpc_device_list);
3018
3019         if (serial_driver) {
3020                 if ((rc = tty_unregister_driver(serial_driver)))
3021                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3022                                __FILE__,__LINE__,rc);
3023                 put_tty_driver(serial_driver);
3024         }
3025
3026         pcmcia_unregister_driver(&mgslpc_driver);
3027 }
3028
3029 static int __init synclink_cs_init(void)
3030 {
3031     int rc;
3032
3033     if (break_on_load) {
3034             mgslpc_get_text_ptr();
3035             BREAKPOINT();
3036     }
3037
3038     printk("%s %s\n", driver_name, driver_version);
3039
3040     if ((rc = pcmcia_register_driver(&mgslpc_driver)) < 0)
3041             return rc;
3042
3043     serial_driver = alloc_tty_driver(MAX_DEVICE_COUNT);
3044     if (!serial_driver) {
3045             rc = -ENOMEM;
3046             goto error;
3047     }
3048
3049     /* Initialize the tty_driver structure */
3050
3051     serial_driver->owner = THIS_MODULE;
3052     serial_driver->driver_name = "synclink_cs";
3053     serial_driver->name = "ttySLP";
3054     serial_driver->major = ttymajor;
3055     serial_driver->minor_start = 64;
3056     serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3057     serial_driver->subtype = SERIAL_TYPE_NORMAL;
3058     serial_driver->init_termios = tty_std_termios;
3059     serial_driver->init_termios.c_cflag =
3060             B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3061     serial_driver->flags = TTY_DRIVER_REAL_RAW;
3062     tty_set_operations(serial_driver, &mgslpc_ops);
3063
3064     if ((rc = tty_register_driver(serial_driver)) < 0) {
3065             printk("%s(%d):Couldn't register serial driver\n",
3066                    __FILE__,__LINE__);
3067             put_tty_driver(serial_driver);
3068             serial_driver = NULL;
3069             goto error;
3070     }
3071
3072     printk("%s %s, tty major#%d\n",
3073            driver_name, driver_version,
3074            serial_driver->major);
3075
3076     return 0;
3077
3078 error:
3079     synclink_cs_cleanup();
3080     return rc;
3081 }
3082
3083 static void __exit synclink_cs_exit(void)
3084 {
3085         synclink_cs_cleanup();
3086 }
3087
3088 module_init(synclink_cs_init);
3089 module_exit(synclink_cs_exit);
3090
3091 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
3092 {
3093         unsigned int M, N;
3094         unsigned char val;
3095
3096         /* note:standard BRG mode is broken in V3.2 chip
3097          * so enhanced mode is always used
3098          */
3099
3100         if (rate) {
3101                 N = 3686400 / rate;
3102                 if (!N)
3103                         N = 1;
3104                 N >>= 1;
3105                 for (M = 1; N > 64 && M < 16; M++)
3106                         N >>= 1;
3107                 N--;
3108
3109                 /* BGR[5..0] = N
3110                  * BGR[9..6] = M
3111                  * BGR[7..0] contained in BGR register
3112                  * BGR[9..8] contained in CCR2[7..6]
3113                  * divisor = (N+1)*2^M
3114                  *
3115                  * Note: M *must* not be zero (causes asymetric duty cycle)
3116                  */
3117                 write_reg(info, (unsigned char) (channel + BGR),
3118                                   (unsigned char) ((M << 6) + N));
3119                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
3120                 val |= ((M << 4) & 0xc0);
3121                 write_reg(info, (unsigned char) (channel + CCR2), val);
3122         }
3123 }
3124
3125 /* Enabled the AUX clock output at the specified frequency.
3126  */
3127 static void enable_auxclk(MGSLPC_INFO *info)
3128 {
3129         unsigned char val;
3130
3131         /* MODE
3132          *
3133          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3134          * 05      ADM Address Mode, 0 = no addr recognition
3135          * 04      TMD Timer Mode, 0 = external
3136          * 03      RAC Receiver Active, 0 = inactive
3137          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3138          * 01      TRS Timer Resolution, 1=512
3139          * 00      TLP Test Loop, 0 = no loop
3140          *
3141          * 1000 0010
3142          */
3143         val = 0x82;
3144
3145         /* channel B RTS is used to enable AUXCLK driver on SP505 */
3146         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3147                 val |= BIT2;
3148         write_reg(info, CHB + MODE, val);
3149
3150         /* CCR0
3151          *
3152          * 07      PU Power Up, 1=active, 0=power down
3153          * 06      MCE Master Clock Enable, 1=enabled
3154          * 05      Reserved, 0
3155          * 04..02  SC[2..0] Encoding
3156          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3157          *
3158          * 11000000
3159          */
3160         write_reg(info, CHB + CCR0, 0xc0);
3161
3162         /* CCR1
3163          *
3164          * 07      SFLG Shared Flag, 0 = disable shared flags
3165          * 06      GALP Go Active On Loop, 0 = not used
3166          * 05      GLP Go On Loop, 0 = not used
3167          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3168          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3169          * 02..00  CM[2..0] Clock Mode
3170          *
3171          * 0001 0111
3172          */
3173         write_reg(info, CHB + CCR1, 0x17);
3174
3175         /* CCR2 (Channel B)
3176          *
3177          * 07..06  BGR[9..8] Baud rate bits 9..8
3178          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3179          * 04      SSEL Clock source select, 1=submode b
3180          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
3181          * 02      RWX Read/Write Exchange 0=disabled
3182          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3183          * 00      DIV, data inversion 0=disabled, 1=enabled
3184          *
3185          * 0011 1000
3186          */
3187         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3188                 write_reg(info, CHB + CCR2, 0x38);
3189         else
3190                 write_reg(info, CHB + CCR2, 0x30);
3191
3192         /* CCR4
3193          *
3194          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3195          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3196          * 05      TST1 Test Pin, 0=normal operation
3197          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3198          * 03..02  Reserved, must be 0
3199          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3200          *
3201          * 0101 0000
3202          */
3203         write_reg(info, CHB + CCR4, 0x50);
3204
3205         /* if auxclk not enabled, set internal BRG so
3206          * CTS transitions can be detected (requires TxC)
3207          */
3208         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3209                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3210         else
3211                 mgslpc_set_rate(info, CHB, 921600);
3212 }
3213
3214 static void loopback_enable(MGSLPC_INFO *info)
3215 {
3216         unsigned char val;
3217
3218         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3219         val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3220         write_reg(info, CHA + CCR1, val);
3221
3222         /* CCR2:04 SSEL Clock source select, 1=submode b */
3223         val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3224         write_reg(info, CHA + CCR2, val);
3225
3226         /* set LinkSpeed if available, otherwise default to 2Mbps */
3227         if (info->params.clock_speed)
3228                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3229         else
3230                 mgslpc_set_rate(info, CHA, 1843200);
3231
3232         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3233         val = read_reg(info, CHA + MODE) | BIT0;
3234         write_reg(info, CHA + MODE, val);
3235 }
3236
3237 static void hdlc_mode(MGSLPC_INFO *info)
3238 {
3239         unsigned char val;
3240         unsigned char clkmode, clksubmode;
3241
3242         /* disable all interrupts */
3243         irq_disable(info, CHA, 0xffff);
3244         irq_disable(info, CHB, 0xffff);
3245         port_irq_disable(info, 0xff);
3246
3247         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3248         clkmode = clksubmode = 0;
3249         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3250             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3251                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3252                 clkmode = 7;
3253         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3254                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3255                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3256                 clkmode = 7;
3257                 clksubmode = 1;
3258         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3259                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3260                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3261                         clkmode = 6;
3262                         clksubmode = 1;
3263                 } else {
3264                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3265                         clkmode = 6;
3266                 }
3267         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3268                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3269                 clksubmode = 1;
3270         }
3271
3272         /* MODE
3273          *
3274          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3275          * 05      ADM Address Mode, 0 = no addr recognition
3276          * 04      TMD Timer Mode, 0 = external
3277          * 03      RAC Receiver Active, 0 = inactive
3278          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3279          * 01      TRS Timer Resolution, 1=512
3280          * 00      TLP Test Loop, 0 = no loop
3281          *
3282          * 1000 0010
3283          */
3284         val = 0x82;
3285         if (info->params.loopback)
3286                 val |= BIT0;
3287
3288         /* preserve RTS state */
3289         if (info->serial_signals & SerialSignal_RTS)
3290                 val |= BIT2;
3291         write_reg(info, CHA + MODE, val);
3292
3293         /* CCR0
3294          *
3295          * 07      PU Power Up, 1=active, 0=power down
3296          * 06      MCE Master Clock Enable, 1=enabled
3297          * 05      Reserved, 0
3298          * 04..02  SC[2..0] Encoding
3299          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3300          *
3301          * 11000000
3302          */
3303         val = 0xc0;
3304         switch (info->params.encoding)
3305         {
3306         case HDLC_ENCODING_NRZI:
3307                 val |= BIT3;
3308                 break;
3309         case HDLC_ENCODING_BIPHASE_SPACE:
3310                 val |= BIT4;
3311                 break;          // FM0
3312         case HDLC_ENCODING_BIPHASE_MARK:
3313                 val |= BIT4 + BIT2;
3314                 break;          // FM1
3315         case HDLC_ENCODING_BIPHASE_LEVEL:
3316                 val |= BIT4 + BIT3;
3317                 break;          // Manchester
3318         }
3319         write_reg(info, CHA + CCR0, val);
3320
3321         /* CCR1
3322          *
3323          * 07      SFLG Shared Flag, 0 = disable shared flags
3324          * 06      GALP Go Active On Loop, 0 = not used
3325          * 05      GLP Go On Loop, 0 = not used
3326          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3327          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3328          * 02..00  CM[2..0] Clock Mode
3329          *
3330          * 0001 0000
3331          */
3332         val = 0x10 + clkmode;
3333         write_reg(info, CHA + CCR1, val);
3334
3335         /* CCR2
3336          *
3337          * 07..06  BGR[9..8] Baud rate bits 9..8
3338          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3339          * 04      SSEL Clock source select, 1=submode b
3340          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3341          * 02      RWX Read/Write Exchange 0=disabled
3342          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3343          * 00      DIV, data inversion 0=disabled, 1=enabled
3344          *
3345          * 0000 0000
3346          */
3347         val = 0x00;
3348         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3349             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3350                 val |= BIT5;
3351         if (clksubmode)
3352                 val |= BIT4;
3353         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3354                 val |= BIT1;
3355         if (info->params.encoding == HDLC_ENCODING_NRZB)
3356                 val |= BIT0;
3357         write_reg(info, CHA + CCR2, val);
3358
3359         /* CCR3
3360          *
3361          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3362          * 05      EPT Enable preamble transmission, 1=enabled
3363          * 04      RADD Receive address pushed to FIFO, 0=disabled
3364          * 03      CRL CRC Reset Level, 0=FFFF
3365          * 02      RCRC Rx CRC 0=On 1=Off
3366          * 01      TCRC Tx CRC 0=On 1=Off
3367          * 00      PSD DPLL Phase Shift Disable
3368          *
3369          * 0000 0000
3370          */
3371         val = 0x00;
3372         if (info->params.crc_type == HDLC_CRC_NONE)
3373                 val |= BIT2 + BIT1;
3374         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3375                 val |= BIT5;
3376         switch (info->params.preamble_length)
3377         {
3378         case HDLC_PREAMBLE_LENGTH_16BITS:
3379                 val |= BIT6;
3380                 break;
3381         case HDLC_PREAMBLE_LENGTH_32BITS:
3382                 val |= BIT6;
3383                 break;
3384         case HDLC_PREAMBLE_LENGTH_64BITS:
3385                 val |= BIT7 + BIT6;
3386                 break;
3387         }
3388         write_reg(info, CHA + CCR3, val);
3389
3390         /* PRE - Preamble pattern */
3391         val = 0;
3392         switch (info->params.preamble)
3393         {
3394         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3395         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3396         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3397         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3398         }
3399         write_reg(info, CHA + PRE, val);
3400
3401         /* CCR4
3402          *
3403          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3404          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3405          * 05      TST1 Test Pin, 0=normal operation
3406          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3407          * 03..02  Reserved, must be 0
3408          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3409          *
3410          * 0101 0000
3411          */
3412         val = 0x50;
3413         write_reg(info, CHA + CCR4, val);
3414         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3415                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3416         else
3417                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3418
3419         /* RLCR Receive length check register
3420          *
3421          * 7     1=enable receive length check
3422          * 6..0  Max frame length = (RL + 1) * 32
3423          */
3424         write_reg(info, CHA + RLCR, 0);
3425
3426         /* XBCH Transmit Byte Count High
3427          *
3428          * 07      DMA mode, 0 = interrupt driven
3429          * 06      NRM, 0=ABM (ignored)
3430          * 05      CAS Carrier Auto Start
3431          * 04      XC Transmit Continuously (ignored)
3432          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3433          *
3434          * 0000 0000
3435          */
3436         val = 0x00;
3437         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3438                 val |= BIT5;
3439         write_reg(info, CHA + XBCH, val);
3440         enable_auxclk(info);
3441         if (info->params.loopback || info->testing_irq)
3442                 loopback_enable(info);
3443         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3444         {
3445                 irq_enable(info, CHB, IRQ_CTS);
3446                 /* PVR[3] 1=AUTO CTS active */
3447                 set_reg_bits(info, CHA + PVR, BIT3);
3448         } else
3449                 clear_reg_bits(info, CHA + PVR, BIT3);
3450
3451         irq_enable(info, CHA,
3452                          IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3453                          IRQ_UNDERRUN + IRQ_TXFIFO);
3454         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3455         wait_command_complete(info, CHA);
3456         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3457
3458         /* Master clock mode enabled above to allow reset commands
3459          * to complete even if no data clocks are present.
3460          *
3461          * Disable master clock mode for normal communications because
3462          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3463          * IRQ when in master clock mode.
3464          *
3465          * Leave master clock mode enabled for IRQ test because the
3466          * timer IRQ used by the test can only happen in master clock mode.
3467          */
3468         if (!info->testing_irq)
3469                 clear_reg_bits(info, CHA + CCR0, BIT6);
3470
3471         tx_set_idle(info);
3472
3473         tx_stop(info);
3474         rx_stop(info);
3475 }
3476
3477 static void rx_stop(MGSLPC_INFO *info)
3478 {
3479         if (debug_level >= DEBUG_LEVEL_ISR)
3480                 printk("%s(%d):rx_stop(%s)\n",
3481                          __FILE__,__LINE__, info->device_name );
3482
3483         /* MODE:03 RAC Receiver Active, 0=inactive */
3484         clear_reg_bits(info, CHA + MODE, BIT3);
3485
3486         info->rx_enabled = false;
3487         info->rx_overflow = false;
3488 }
3489
3490 static void rx_start(MGSLPC_INFO *info)
3491 {
3492         if (debug_level >= DEBUG_LEVEL_ISR)
3493                 printk("%s(%d):rx_start(%s)\n",
3494                          __FILE__,__LINE__, info->device_name );
3495
3496         rx_reset_buffers(info);
3497         info->rx_enabled = false;
3498         info->rx_overflow = false;
3499
3500         /* MODE:03 RAC Receiver Active, 1=active */
3501         set_reg_bits(info, CHA + MODE, BIT3);
3502
3503         info->rx_enabled = true;
3504 }
3505
3506 static void tx_start(MGSLPC_INFO *info)
3507 {
3508         if (debug_level >= DEBUG_LEVEL_ISR)
3509                 printk("%s(%d):tx_start(%s)\n",
3510                          __FILE__,__LINE__, info->device_name );
3511
3512         if (info->tx_count) {
3513                 /* If auto RTS enabled and RTS is inactive, then assert */
3514                 /* RTS and set a flag indicating that the driver should */
3515                 /* negate RTS when the transmission completes. */
3516                 info->drop_rts_on_tx_done = false;
3517
3518                 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3519                         get_signals(info);
3520                         if (!(info->serial_signals & SerialSignal_RTS)) {
3521                                 info->serial_signals |= SerialSignal_RTS;
3522                                 set_signals(info);
3523                                 info->drop_rts_on_tx_done = true;
3524                         }
3525                 }
3526
3527                 if (info->params.mode == MGSL_MODE_ASYNC) {
3528                         if (!info->tx_active) {
3529                                 info->tx_active = true;
3530                                 tx_ready(info);
3531                         }
3532                 } else {
3533                         info->tx_active = true;
3534                         tx_ready(info);
3535                         mod_timer(&info->tx_timer, jiffies +
3536                                         msecs_to_jiffies(5000));
3537                 }
3538         }
3539
3540         if (!info->tx_enabled)
3541                 info->tx_enabled = true;
3542 }
3543
3544 static void tx_stop(MGSLPC_INFO *info)
3545 {
3546         if (debug_level >= DEBUG_LEVEL_ISR)
3547                 printk("%s(%d):tx_stop(%s)\n",
3548                          __FILE__,__LINE__, info->device_name );
3549
3550         del_timer(&info->tx_timer);
3551
3552         info->tx_enabled = false;
3553         info->tx_active = false;
3554 }
3555
3556 /* Reset the adapter to a known state and prepare it for further use.
3557  */
3558 static void reset_device(MGSLPC_INFO *info)
3559 {
3560         /* power up both channels (set BIT7) */
3561         write_reg(info, CHA + CCR0, 0x80);
3562         write_reg(info, CHB + CCR0, 0x80);
3563         write_reg(info, CHA + MODE, 0);
3564         write_reg(info, CHB + MODE, 0);
3565
3566         /* disable all interrupts */
3567         irq_disable(info, CHA, 0xffff);
3568         irq_disable(info, CHB, 0xffff);
3569         port_irq_disable(info, 0xff);
3570
3571         /* PCR Port Configuration Register
3572          *
3573          * 07..04  DEC[3..0] Serial I/F select outputs
3574          * 03      output, 1=AUTO CTS control enabled
3575          * 02      RI Ring Indicator input 0=active
3576          * 01      DSR input 0=active
3577          * 00      DTR output 0=active
3578          *
3579          * 0000 0110
3580          */
3581         write_reg(info, PCR, 0x06);
3582
3583         /* PVR Port Value Register
3584          *
3585          * 07..04  DEC[3..0] Serial I/F select (0000=disabled)
3586          * 03      AUTO CTS output 1=enabled
3587          * 02      RI Ring Indicator input
3588          * 01      DSR input
3589          * 00      DTR output (1=inactive)
3590          *
3591          * 0000 0001
3592          */
3593 //      write_reg(info, PVR, PVR_DTR);
3594
3595         /* IPC Interrupt Port Configuration
3596          *
3597          * 07      VIS 1=Masked interrupts visible
3598          * 06..05  Reserved, 0
3599          * 04..03  SLA Slave address, 00 ignored
3600          * 02      CASM Cascading Mode, 1=daisy chain
3601          * 01..00  IC[1..0] Interrupt Config, 01=push-pull output, active low
3602          *
3603          * 0000 0101
3604          */
3605         write_reg(info, IPC, 0x05);
3606 }
3607
3608 static void async_mode(MGSLPC_INFO *info)
3609 {
3610         unsigned char val;
3611
3612         /* disable all interrupts */
3613         irq_disable(info, CHA, 0xffff);
3614         irq_disable(info, CHB, 0xffff);
3615         port_irq_disable(info, 0xff);
3616
3617         /* MODE
3618          *
3619          * 07      Reserved, 0
3620          * 06      FRTS RTS State, 0=active
3621          * 05      FCTS Flow Control on CTS
3622          * 04      FLON Flow Control Enable
3623          * 03      RAC Receiver Active, 0 = inactive
3624          * 02      RTS 0=Auto RTS, 1=manual RTS
3625          * 01      TRS Timer Resolution, 1=512
3626          * 00      TLP Test Loop, 0 = no loop
3627          *
3628          * 0000 0110
3629          */
3630         val = 0x06;
3631         if (info->params.loopback)
3632                 val |= BIT0;
3633
3634         /* preserve RTS state */
3635         if (!(info->serial_signals & SerialSignal_RTS))
3636                 val |= BIT6;
3637         write_reg(info, CHA + MODE, val);
3638
3639         /* CCR0
3640          *
3641          * 07      PU Power Up, 1=active, 0=power down
3642          * 06      MCE Master Clock Enable, 1=enabled
3643          * 05      Reserved, 0
3644          * 04..02  SC[2..0] Encoding, 000=NRZ
3645          * 01..00  SM[1..0] Serial Mode, 11=Async
3646          *
3647          * 1000 0011
3648          */
3649         write_reg(info, CHA + CCR0, 0x83);
3650
3651         /* CCR1
3652          *
3653          * 07..05  Reserved, 0
3654          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3655          * 03      BCR Bit Clock Rate, 1=16x
3656          * 02..00  CM[2..0] Clock Mode, 111=BRG
3657          *
3658          * 0001 1111
3659          */
3660         write_reg(info, CHA + CCR1, 0x1f);
3661
3662         /* CCR2 (channel A)
3663          *
3664          * 07..06  BGR[9..8] Baud rate bits 9..8
3665          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3666          * 04      SSEL Clock source select, 1=submode b
3667          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3668          * 02      RWX Read/Write Exchange 0=disabled
3669          * 01      Reserved, 0
3670          * 00      DIV, data inversion 0=disabled, 1=enabled
3671          *
3672          * 0001 0000
3673          */
3674         write_reg(info, CHA + CCR2, 0x10);
3675
3676         /* CCR3
3677          *
3678          * 07..01  Reserved, 0
3679          * 00      PSD DPLL Phase Shift Disable
3680          *
3681          * 0000 0000
3682          */
3683         write_reg(info, CHA + CCR3, 0);
3684
3685         /* CCR4
3686          *
3687          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3688          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3689          * 05      TST1 Test Pin, 0=normal operation
3690          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3691          * 03..00  Reserved, must be 0
3692          *
3693          * 0101 0000
3694          */
3695         write_reg(info, CHA + CCR4, 0x50);
3696         mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3697
3698         /* DAFO Data Format
3699          *
3700          * 07      Reserved, 0
3701          * 06      XBRK transmit break, 0=normal operation
3702          * 05      Stop bits (0=1, 1=2)
3703          * 04..03  PAR[1..0] Parity (01=odd, 10=even)
3704          * 02      PAREN Parity Enable
3705          * 01..00  CHL[1..0] Character Length (00=8, 01=7)
3706          *
3707          */
3708         val = 0x00;
3709         if (info->params.data_bits != 8)
3710                 val |= BIT0;    /* 7 bits */
3711         if (info->params.stop_bits != 1)
3712                 val |= BIT5;
3713         if (info->params.parity != ASYNC_PARITY_NONE)
3714         {
3715                 val |= BIT2;    /* Parity enable */
3716                 if (info->params.parity == ASYNC_PARITY_ODD)
3717                         val |= BIT3;
3718                 else
3719                         val |= BIT4;
3720         }
3721         write_reg(info, CHA + DAFO, val);
3722
3723         /* RFC Rx FIFO Control
3724          *
3725          * 07      Reserved, 0
3726          * 06      DPS, 1=parity bit not stored in data byte
3727          * 05      DXS, 0=all data stored in FIFO (including XON/XOFF)
3728          * 04      RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3729          * 03..02  RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3730          * 01      Reserved, 0
3731          * 00      TCDE Terminate Char Detect Enable, 0=disabled
3732          *
3733          * 0101 1100
3734          */
3735         write_reg(info, CHA + RFC, 0x5c);
3736
3737         /* RLCR Receive length check register
3738          *
3739          * Max frame length = (RL + 1) * 32
3740          */
3741         write_reg(info, CHA + RLCR, 0);
3742
3743         /* XBCH Transmit Byte Count High
3744          *
3745          * 07      DMA mode, 0 = interrupt driven
3746          * 06      NRM, 0=ABM (ignored)
3747          * 05      CAS Carrier Auto Start
3748          * 04      XC Transmit Continuously (ignored)
3749          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3750          *
3751          * 0000 0000
3752          */
3753         val = 0x00;
3754         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3755                 val |= BIT5;
3756         write_reg(info, CHA + XBCH, val);
3757         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3758                 irq_enable(info, CHA, IRQ_CTS);
3759
3760         /* MODE:03 RAC Receiver Active, 1=active */
3761         set_reg_bits(info, CHA + MODE, BIT3);
3762         enable_auxclk(info);
3763         if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3764                 irq_enable(info, CHB, IRQ_CTS);
3765                 /* PVR[3] 1=AUTO CTS active */
3766                 set_reg_bits(info, CHA + PVR, BIT3);
3767         } else
3768                 clear_reg_bits(info, CHA + PVR, BIT3);
3769         irq_enable(info, CHA,
3770                           IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3771                           IRQ_ALLSENT + IRQ_TXFIFO);
3772         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3773         wait_command_complete(info, CHA);
3774         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3775 }
3776
3777 /* Set the HDLC idle mode for the transmitter.
3778  */
3779 static void tx_set_idle(MGSLPC_INFO *info)
3780 {
3781         /* Note: ESCC2 only supports flags and one idle modes */
3782         if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3783                 set_reg_bits(info, CHA + CCR1, BIT3);
3784         else
3785                 clear_reg_bits(info, CHA + CCR1, BIT3);
3786 }
3787
3788 /* get state of the V24 status (input) signals.
3789  */
3790 static void get_signals(MGSLPC_INFO *info)
3791 {
3792         unsigned char status = 0;
3793
3794         /* preserve DTR and RTS */
3795         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3796
3797         if (read_reg(info, CHB + VSTR) & BIT7)
3798                 info->serial_signals |= SerialSignal_DCD;
3799         if (read_reg(info, CHB + STAR) & BIT1)
3800                 info->serial_signals |= SerialSignal_CTS;
3801
3802         status = read_reg(info, CHA + PVR);
3803         if (!(status & PVR_RI))
3804                 info->serial_signals |= SerialSignal_RI;
3805         if (!(status & PVR_DSR))
3806                 info->serial_signals |= SerialSignal_DSR;
3807 }
3808
3809 /* Set the state of DTR and RTS based on contents of
3810  * serial_signals member of device extension.
3811  */
3812 static void set_signals(MGSLPC_INFO *info)
3813 {
3814         unsigned char val;
3815
3816         val = read_reg(info, CHA + MODE);
3817         if (info->params.mode == MGSL_MODE_ASYNC) {
3818                 if (info->serial_signals & SerialSignal_RTS)
3819                         val &= ~BIT6;
3820                 else
3821                         val |= BIT6;
3822         } else {
3823                 if (info->serial_signals & SerialSignal_RTS)
3824                         val |= BIT2;
3825                 else
3826                         val &= ~BIT2;
3827         }
3828         write_reg(info, CHA + MODE, val);
3829
3830         if (info->serial_signals & SerialSignal_DTR)
3831                 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3832         else
3833                 set_reg_bits(info, CHA + PVR, PVR_DTR);
3834 }
3835
3836 static void rx_reset_buffers(MGSLPC_INFO *info)
3837 {
3838         RXBUF *buf;
3839         int i;
3840
3841         info->rx_put = 0;
3842         info->rx_get = 0;
3843         info->rx_frame_count = 0;
3844         for (i=0 ; i < info->rx_buf_count ; i++) {
3845                 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3846                 buf->status = buf->count = 0;
3847         }
3848 }
3849
3850 /* Attempt to return a received HDLC frame
3851  * Only frames received without errors are returned.
3852  *
3853  * Returns true if frame returned, otherwise false
3854  */
3855 static bool rx_get_frame(MGSLPC_INFO *info)
3856 {
3857         unsigned short status;
3858         RXBUF *buf;
3859         unsigned int framesize = 0;
3860         unsigned long flags;
3861         struct tty_struct *tty = info->tty;
3862         bool return_frame = false;
3863
3864         if (info->rx_frame_count == 0)
3865                 return false;
3866
3867         buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3868
3869         status = buf->status;
3870
3871         /* 07  VFR  1=valid frame
3872          * 06  RDO  1=data overrun
3873          * 05  CRC  1=OK, 0=error
3874          * 04  RAB  1=frame aborted
3875          */
3876         if ((status & 0xf0) != 0xA0) {
3877                 if (!(status & BIT7) || (status & BIT4))
3878                         info->icount.rxabort++;
3879                 else if (status & BIT6)
3880                         info->icount.rxover++;
3881                 else if (!(status & BIT5)) {
3882                         info->icount.rxcrc++;
3883                         if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3884                                 return_frame = true;
3885                 }
3886                 framesize = 0;
3887 #if SYNCLINK_GENERIC_HDLC
3888                 {
3889                         info->netdev->stats.rx_errors++;
3890                         info->netdev->stats.rx_frame_errors++;
3891                 }
3892 #endif
3893         } else
3894                 return_frame = true;
3895
3896         if (return_frame)
3897                 framesize = buf->count;
3898
3899         if (debug_level >= DEBUG_LEVEL_BH)
3900                 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3901                         __FILE__,__LINE__,info->device_name,status,framesize);
3902
3903         if (debug_level >= DEBUG_LEVEL_DATA)
3904                 trace_block(info, buf->data, framesize, 0);
3905
3906         if (framesize) {
3907                 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3908                       framesize+1 > info->max_frame_size) ||
3909                     framesize > info->max_frame_size)
3910                         info->icount.rxlong++;
3911                 else {
3912                         if (status & BIT5)
3913                                 info->icount.rxok++;
3914
3915                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3916                                 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3917                                 ++framesize;
3918                         }
3919
3920 #if SYNCLINK_GENERIC_HDLC
3921                         if (info->netcount)
3922                                 hdlcdev_rx(info, buf->data, framesize);
3923                         else
3924 #endif
3925                                 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3926                 }
3927         }
3928
3929         spin_lock_irqsave(&info->lock,flags);
3930         buf->status = buf->count = 0;
3931         info->rx_frame_count--;
3932         info->rx_get++;
3933         if (info->rx_get >= info->rx_buf_count)
3934                 info->rx_get = 0;
3935         spin_unlock_irqrestore(&info->lock,flags);
3936
3937         return true;
3938 }
3939
3940 static bool register_test(MGSLPC_INFO *info)
3941 {
3942         static unsigned char patterns[] =
3943             { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3944         static unsigned int count = ARRAY_SIZE(patterns);
3945         unsigned int i;
3946         bool rc = true;
3947         unsigned long flags;
3948
3949         spin_lock_irqsave(&info->lock,flags);
3950         reset_device(info);
3951
3952         for (i = 0; i < count; i++) {
3953                 write_reg(info, XAD1, patterns[i]);
3954                 write_reg(info, XAD2, patterns[(i + 1) % count]);
3955                 if ((read_reg(info, XAD1) != patterns[i]) ||
3956                     (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3957                         rc = false;
3958                         break;
3959                 }
3960         }
3961
3962         spin_unlock_irqrestore(&info->lock,flags);
3963         return rc;
3964 }
3965
3966 static bool irq_test(MGSLPC_INFO *info)
3967 {
3968         unsigned long end_time;
3969         unsigned long flags;
3970
3971         spin_lock_irqsave(&info->lock,flags);
3972         reset_device(info);
3973
3974         info->testing_irq = true;
3975         hdlc_mode(info);
3976
3977         info->irq_occurred = false;
3978
3979         /* init hdlc mode */
3980
3981         irq_enable(info, CHA, IRQ_TIMER);
3982         write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3983         issue_command(info, CHA, CMD_START_TIMER);
3984
3985         spin_unlock_irqrestore(&info->lock,flags);
3986
3987         end_time=100;
3988         while(end_time-- && !info->irq_occurred) {
3989                 msleep_interruptible(10);
3990         }
3991
3992         info->testing_irq = false;
3993
3994         spin_lock_irqsave(&info->lock,flags);
3995         reset_device(info);
3996         spin_unlock_irqrestore(&info->lock,flags);
3997
3998         return info->irq_occurred;
3999 }
4000
4001 static int adapter_test(MGSLPC_INFO *info)
4002 {
4003         if (!register_test(info)) {
4004                 info->init_error = DiagStatus_AddressFailure;
4005                 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
4006                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
4007                 return -ENODEV;
4008         }
4009
4010         if (!irq_test(info)) {
4011                 info->init_error = DiagStatus_IrqFailure;
4012                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
4013                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
4014                 return -ENODEV;
4015         }
4016
4017         if (debug_level >= DEBUG_LEVEL_INFO)
4018                 printk("%s(%d):device %s passed diagnostics\n",
4019                         __FILE__,__LINE__,info->device_name);
4020         return 0;
4021 }
4022
4023 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
4024 {
4025         int i;
4026         int linecount;
4027         if (xmit)
4028                 printk("%s tx data:\n",info->device_name);
4029         else
4030                 printk("%s rx data:\n",info->device_name);
4031
4032         while(count) {
4033                 if (count > 16)
4034                         linecount = 16;
4035                 else
4036                         linecount = count;
4037
4038                 for(i=0;i<linecount;i++)
4039                         printk("%02X ",(unsigned char)data[i]);
4040                 for(;i<17;i++)
4041                         printk("   ");
4042                 for(i=0;i<linecount;i++) {
4043                         if (data[i]>=040 && data[i]<=0176)
4044                                 printk("%c",data[i]);
4045                         else
4046                                 printk(".");
4047                 }
4048                 printk("\n");
4049
4050                 data  += linecount;
4051                 count -= linecount;
4052         }
4053 }
4054
4055 /* HDLC frame time out
4056  * update stats and do tx completion processing
4057  */
4058 static void tx_timeout(unsigned long context)
4059 {
4060         MGSLPC_INFO *info = (MGSLPC_INFO*)context;
4061         unsigned long flags;
4062
4063         if ( debug_level >= DEBUG_LEVEL_INFO )
4064                 printk( "%s(%d):tx_timeout(%s)\n",
4065                         __FILE__,__LINE__,info->device_name);
4066         if(info->tx_active &&
4067            info->params.mode == MGSL_MODE_HDLC) {
4068                 info->icount.txtimeout++;
4069         }
4070         spin_lock_irqsave(&info->lock,flags);
4071         info->tx_active = false;
4072         info->tx_count = info->tx_put = info->tx_get = 0;
4073
4074         spin_unlock_irqrestore(&info->lock,flags);
4075
4076 #if SYNCLINK_GENERIC_HDLC
4077         if (info->netcount)
4078                 hdlcdev_tx_done(info);
4079         else
4080 #endif
4081                 bh_transmit(info);
4082 }
4083
4084 #if SYNCLINK_GENERIC_HDLC
4085
4086 /**
4087  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
4088  * set encoding and frame check sequence (FCS) options
4089  *
4090  * dev       pointer to network device structure
4091  * encoding  serial encoding setting
4092  * parity    FCS setting
4093  *
4094  * returns 0 if success, otherwise error code
4095  */
4096 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
4097                           unsigned short parity)
4098 {
4099         MGSLPC_INFO *info = dev_to_port(dev);
4100         unsigned char  new_encoding;
4101         unsigned short new_crctype;
4102
4103         /* return error if TTY interface open */
4104         if (info->count)
4105                 return -EBUSY;
4106
4107         switch (encoding)
4108         {
4109         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
4110         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
4111         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
4112         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
4113         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
4114         default: return -EINVAL;
4115         }
4116
4117         switch (parity)
4118         {
4119         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
4120         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
4121         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
4122         default: return -EINVAL;
4123         }
4124
4125         info->params.encoding = new_encoding;
4126         info->params.crc_type = new_crctype;
4127
4128         /* if network interface up, reprogram hardware */
4129         if (info->netcount)
4130                 mgslpc_program_hw(info);
4131
4132         return 0;
4133 }
4134
4135 /**
4136  * called by generic HDLC layer to send frame
4137  *
4138  * skb  socket buffer containing HDLC frame
4139  * dev  pointer to network device structure
4140  *
4141  * returns 0 if success, otherwise error code
4142  */
4143 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
4144 {
4145         MGSLPC_INFO *info = dev_to_port(dev);
4146         unsigned long flags;
4147
4148         if (debug_level >= DEBUG_LEVEL_INFO)
4149                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
4150
4151         /* stop sending until this frame completes */
4152         netif_stop_queue(dev);
4153
4154         /* copy data to device buffers */
4155         skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
4156         info->tx_get = 0;
4157         info->tx_put = info->tx_count = skb->len;
4158
4159         /* update network statistics */
4160         dev->stats.tx_packets++;
4161         dev->stats.tx_bytes += skb->len;
4162
4163         /* done with socket buffer, so free it */
4164         dev_kfree_skb(skb);
4165
4166         /* save start time for transmit timeout detection */
4167         dev->trans_start = jiffies;
4168
4169         /* start hardware transmitter if necessary */
4170         spin_lock_irqsave(&info->lock,flags);
4171         if (!info->tx_active)
4172                 tx_start(info);
4173         spin_unlock_irqrestore(&info->lock,flags);
4174
4175         return 0;
4176 }
4177
4178 /**
4179  * called by network layer when interface enabled
4180  * claim resources and initialize hardware
4181  *
4182  * dev  pointer to network device structure
4183  *
4184  * returns 0 if success, otherwise error code
4185  */
4186 static int hdlcdev_open(struct net_device *dev)
4187 {
4188         MGSLPC_INFO *info = dev_to_port(dev);
4189         int rc;
4190         unsigned long flags;
4191
4192         if (debug_level >= DEBUG_LEVEL_INFO)
4193                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
4194
4195         /* generic HDLC layer open processing */
4196         if ((rc = hdlc_open(dev)))
4197                 return rc;
4198
4199         /* arbitrate between network and tty opens */
4200         spin_lock_irqsave(&info->netlock, flags);
4201         if (info->count != 0 || info->netcount != 0) {
4202                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4203                 spin_unlock_irqrestore(&info->netlock, flags);
4204                 return -EBUSY;
4205         }
4206         info->netcount=1;
4207         spin_unlock_irqrestore(&info->netlock, flags);
4208
4209         /* claim resources and init adapter */
4210         if ((rc = startup(info)) != 0) {
4211                 spin_lock_irqsave(&info->netlock, flags);
4212                 info->netcount=0;
4213                 spin_unlock_irqrestore(&info->netlock, flags);
4214                 return rc;
4215         }
4216
4217         /* assert DTR and RTS, apply hardware settings */
4218         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4219         mgslpc_program_hw(info);
4220
4221         /* enable network layer transmit */
4222         dev->trans_start = jiffies;
4223         netif_start_queue(dev);
4224
4225         /* inform generic HDLC layer of current DCD status */
4226         spin_lock_irqsave(&info->lock, flags);
4227         get_signals(info);
4228         spin_unlock_irqrestore(&info->lock, flags);
4229         if (info->serial_signals & SerialSignal_DCD)
4230                 netif_carrier_on(dev);
4231         else
4232                 netif_carrier_off(dev);
4233         return 0;
4234 }
4235
4236 /**
4237  * called by network layer when interface is disabled
4238  * shutdown hardware and release resources
4239  *
4240  * dev  pointer to network device structure
4241  *
4242  * returns 0 if success, otherwise error code
4243  */
4244 static int hdlcdev_close(struct net_device *dev)
4245 {
4246         MGSLPC_INFO *info = dev_to_port(dev);
4247         unsigned long flags;
4248
4249         if (debug_level >= DEBUG_LEVEL_INFO)
4250                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4251
4252         netif_stop_queue(dev);
4253
4254         /* shutdown adapter and release resources */
4255         shutdown(info);
4256
4257         hdlc_close(dev);
4258
4259         spin_lock_irqsave(&info->netlock, flags);
4260         info->netcount=0;
4261         spin_unlock_irqrestore(&info->netlock, flags);
4262
4263         return 0;
4264 }
4265
4266 /**
4267  * called by network layer to process IOCTL call to network device
4268  *
4269  * dev  pointer to network device structure
4270  * ifr  pointer to network interface request structure
4271  * cmd  IOCTL command code
4272  *
4273  * returns 0 if success, otherwise error code
4274  */
4275 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4276 {
4277         const size_t size = sizeof(sync_serial_settings);
4278         sync_serial_settings new_line;
4279         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4280         MGSLPC_INFO *info = dev_to_port(dev);
4281         unsigned int flags;
4282
4283         if (debug_level >= DEBUG_LEVEL_INFO)
4284                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4285
4286         /* return error if TTY interface open */
4287         if (info->count)
4288                 return -EBUSY;
4289
4290         if (cmd != SIOCWANDEV)
4291                 return hdlc_ioctl(dev, ifr, cmd);
4292
4293         switch(ifr->ifr_settings.type) {
4294         case IF_GET_IFACE: /* return current sync_serial_settings */
4295
4296                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4297                 if (ifr->ifr_settings.size < size) {
4298                         ifr->ifr_settings.size = size; /* data size wanted */
4299                         return -ENOBUFS;
4300                 }
4301
4302                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4303                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4304                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4305                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4306
4307                 switch (flags){
4308                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4309                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
4310                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
4311                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4312                 default: new_line.clock_type = CLOCK_DEFAULT;
4313                 }
4314
4315                 new_line.clock_rate = info->params.clock_speed;
4316                 new_line.loopback   = info->params.loopback ? 1:0;
4317
4318                 if (copy_to_user(line, &new_line, size))
4319                         return -EFAULT;
4320                 return 0;
4321
4322         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4323
4324                 if(!capable(CAP_NET_ADMIN))
4325                         return -EPERM;
4326                 if (copy_from_user(&new_line, line, size))
4327                         return -EFAULT;
4328
4329                 switch (new_line.clock_type)
4330                 {
4331                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4332                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4333                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
4334                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
4335                 case CLOCK_DEFAULT:  flags = info->params.flags &
4336                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4337                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4338                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4339                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
4340                 default: return -EINVAL;
4341                 }
4342
4343                 if (new_line.loopback != 0 && new_line.loopback != 1)
4344                         return -EINVAL;
4345
4346                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4347                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4348                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4349                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4350                 info->params.flags |= flags;
4351
4352                 info->params.loopback = new_line.loopback;
4353
4354                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4355                         info->params.clock_speed = new_line.clock_rate;
4356                 else
4357                         info->params.clock_speed = 0;
4358
4359                 /* if network interface up, reprogram hardware */
4360                 if (info->netcount)
4361                         mgslpc_program_hw(info);
4362                 return 0;
4363
4364         default:
4365                 return hdlc_ioctl(dev, ifr, cmd);
4366         }
4367 }
4368
4369 /**
4370  * called by network layer when transmit timeout is detected
4371  *
4372  * dev  pointer to network device structure
4373  */
4374 static void hdlcdev_tx_timeout(struct net_device *dev)
4375 {
4376         MGSLPC_INFO *info = dev_to_port(dev);
4377         unsigned long flags;
4378
4379         if (debug_level >= DEBUG_LEVEL_INFO)
4380                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4381
4382         dev->stats.tx_errors++;
4383         dev->stats.tx_aborted_errors++;
4384
4385         spin_lock_irqsave(&info->lock,flags);
4386         tx_stop(info);
4387         spin_unlock_irqrestore(&info->lock,flags);
4388
4389         netif_wake_queue(dev);
4390 }
4391
4392 /**
4393  * called by device driver when transmit completes
4394  * reenable network layer transmit if stopped
4395  *
4396  * info  pointer to device instance information
4397  */
4398 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4399 {
4400         if (netif_queue_stopped(info->netdev))
4401                 netif_wake_queue(info->netdev);
4402 }
4403
4404 /**
4405  * called by device driver when frame received
4406  * pass frame to network layer
4407  *
4408  * info  pointer to device instance information
4409  * buf   pointer to buffer contianing frame data
4410  * size  count of data bytes in buf
4411  */
4412 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4413 {
4414         struct sk_buff *skb = dev_alloc_skb(size);
4415         struct net_device *dev = info->netdev;
4416
4417         if (debug_level >= DEBUG_LEVEL_INFO)
4418                 printk("hdlcdev_rx(%s)\n",dev->name);
4419
4420         if (skb == NULL) {
4421                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4422                 dev->stats.rx_dropped++;
4423                 return;
4424         }
4425
4426         memcpy(skb_put(skb, size), buf, size);
4427
4428         skb->protocol = hdlc_type_trans(skb, dev);
4429
4430         dev->stats.rx_packets++;
4431         dev->stats.rx_bytes += size;
4432
4433         netif_rx(skb);
4434
4435         dev->last_rx = jiffies;
4436 }
4437
4438 /**
4439  * called by device driver when adding device instance
4440  * do generic HDLC initialization
4441  *
4442  * info  pointer to device instance information
4443  *
4444  * returns 0 if success, otherwise error code
4445  */
4446 static int hdlcdev_init(MGSLPC_INFO *info)
4447 {
4448         int rc;
4449         struct net_device *dev;
4450         hdlc_device *hdlc;
4451
4452         /* allocate and initialize network and HDLC layer objects */
4453
4454         if (!(dev = alloc_hdlcdev(info))) {
4455                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4456                 return -ENOMEM;
4457         }
4458
4459         /* for network layer reporting purposes only */
4460         dev->base_addr = info->io_base;
4461         dev->irq       = info->irq_level;
4462
4463         /* network layer callbacks and settings */
4464         dev->do_ioctl       = hdlcdev_ioctl;
4465         dev->open           = hdlcdev_open;
4466         dev->stop           = hdlcdev_close;
4467         dev->tx_timeout     = hdlcdev_tx_timeout;
4468         dev->watchdog_timeo = 10*HZ;
4469         dev->tx_queue_len   = 50;
4470
4471         /* generic HDLC layer callbacks and settings */
4472         hdlc         = dev_to_hdlc(dev);
4473         hdlc->attach = hdlcdev_attach;
4474         hdlc->xmit   = hdlcdev_xmit;
4475
4476         /* register objects with HDLC layer */
4477         if ((rc = register_hdlc_device(dev))) {
4478                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4479                 free_netdev(dev);
4480                 return rc;
4481         }
4482
4483         info->netdev = dev;
4484         return 0;
4485 }
4486
4487 /**
4488  * called by device driver when removing device instance
4489  * do generic HDLC cleanup
4490  *
4491  * info  pointer to device instance information
4492  */
4493 static void hdlcdev_exit(MGSLPC_INFO *info)
4494 {
4495         unregister_hdlc_device(info->netdev);
4496         free_netdev(info->netdev);
4497         info->netdev = NULL;
4498 }
4499
4500 #endif /* CONFIG_HDLC */
4501