drivers/char/pcmcia/synclink_cs.c

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