Merge tag 'char-misc-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[~shefty/rdma-dev.git] / 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         int count;
107         unsigned char status;
108         char data[1];
109 } RXBUF;
110
111 /* The queue of BH actions to be performed */
112
113 #define BH_RECEIVE  1
114 #define BH_TRANSMIT 2
115 #define BH_STATUS   4
116
117 #define IO_PIN_SHUTDOWN_LIMIT 100
118
119 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
120
121 struct _input_signal_events {
122         int     ri_up;
123         int     ri_down;
124         int     dsr_up;
125         int     dsr_down;
126         int     dcd_up;
127         int     dcd_down;
128         int     cts_up;
129         int     cts_down;
130 };
131
132
133 /*
134  * Device instance data structure
135  */
136
137 typedef struct _mgslpc_info {
138         struct tty_port         port;
139         void *if_ptr;   /* General purpose pointer (used by SPPP) */
140         int                     magic;
141         int                     line;
142
143         struct mgsl_icount      icount;
144
145         int                     timeout;
146         int                     x_char;         /* xon/xoff character */
147         unsigned char           read_status_mask;
148         unsigned char           ignore_status_mask;
149
150         unsigned char *tx_buf;
151         int            tx_put;
152         int            tx_get;
153         int            tx_count;
154
155         /* circular list of fixed length rx buffers */
156
157         unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
158         int            rx_buf_total_size; /* size of memory allocated for rx buffers */
159         int            rx_put;         /* index of next empty rx buffer */
160         int            rx_get;         /* index of next full rx buffer */
161         int            rx_buf_size;    /* size in bytes of single rx buffer */
162         int            rx_buf_count;   /* total number of rx buffers */
163         int            rx_frame_count; /* number of full rx buffers */
164
165         wait_queue_head_t       status_event_wait_q;
166         wait_queue_head_t       event_wait_q;
167         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
168         struct _mgslpc_info     *next_device;   /* device list link */
169
170         unsigned short imra_value;
171         unsigned short imrb_value;
172         unsigned char  pim_value;
173
174         spinlock_t lock;
175         struct work_struct task;                /* task structure for scheduling bh */
176
177         u32 max_frame_size;
178
179         u32 pending_bh;
180
181         bool bh_running;
182         bool bh_requested;
183
184         int dcd_chkcount; /* check counts to prevent */
185         int cts_chkcount; /* too many IRQs if a signal */
186         int dsr_chkcount; /* is floating */
187         int ri_chkcount;
188
189         bool rx_enabled;
190         bool rx_overflow;
191
192         bool tx_enabled;
193         bool tx_active;
194         bool tx_aborting;
195         u32 idle_mode;
196
197         int if_mode; /* serial interface selection (RS-232, v.35 etc) */
198
199         char device_name[25];           /* device instance name */
200
201         unsigned int io_base;   /* base I/O address of adapter */
202         unsigned int irq_level;
203
204         MGSL_PARAMS params;             /* communications parameters */
205
206         unsigned char serial_signals;   /* current serial signal states */
207
208         bool irq_occurred;              /* for diagnostics use */
209         char testing_irq;
210         unsigned int init_error;        /* startup error (DIAGS)        */
211
212         char *flag_buf;
213         bool drop_rts_on_tx_done;
214
215         struct  _input_signal_events    input_signal_events;
216
217         /* PCMCIA support */
218         struct pcmcia_device    *p_dev;
219         int                   stop;
220
221         /* SPPP/Cisco HDLC device parts */
222         int netcount;
223         spinlock_t netlock;
224
225 #if SYNCLINK_GENERIC_HDLC
226         struct net_device *netdev;
227 #endif
228
229 } MGSLPC_INFO;
230
231 #define MGSLPC_MAGIC 0x5402
232
233 /*
234  * The size of the serial xmit buffer is 1 page, or 4096 bytes
235  */
236 #define TXBUFSIZE 4096
237
238
239 #define CHA     0x00   /* channel A offset */
240 #define CHB     0x40   /* channel B offset */
241
242 /*
243  *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
244  */
245 #undef PVR
246
247 #define RXFIFO  0
248 #define TXFIFO  0
249 #define STAR    0x20
250 #define CMDR    0x20
251 #define RSTA    0x21
252 #define PRE     0x21
253 #define MODE    0x22
254 #define TIMR    0x23
255 #define XAD1    0x24
256 #define XAD2    0x25
257 #define RAH1    0x26
258 #define RAH2    0x27
259 #define DAFO    0x27
260 #define RAL1    0x28
261 #define RFC     0x28
262 #define RHCR    0x29
263 #define RAL2    0x29
264 #define RBCL    0x2a
265 #define XBCL    0x2a
266 #define RBCH    0x2b
267 #define XBCH    0x2b
268 #define CCR0    0x2c
269 #define CCR1    0x2d
270 #define CCR2    0x2e
271 #define CCR3    0x2f
272 #define VSTR    0x34
273 #define BGR     0x34
274 #define RLCR    0x35
275 #define AML     0x36
276 #define AMH     0x37
277 #define GIS     0x38
278 #define IVA     0x38
279 #define IPC     0x39
280 #define ISR     0x3a
281 #define IMR     0x3a
282 #define PVR     0x3c
283 #define PIS     0x3d
284 #define PIM     0x3d
285 #define PCR     0x3e
286 #define CCR4    0x3f
287
288 // IMR/ISR
289
290 #define IRQ_BREAK_ON    BIT15   // rx break detected
291 #define IRQ_DATAOVERRUN BIT14   // receive data overflow
292 #define IRQ_ALLSENT     BIT13   // all sent
293 #define IRQ_UNDERRUN    BIT12   // transmit data underrun
294 #define IRQ_TIMER       BIT11   // timer interrupt
295 #define IRQ_CTS         BIT10   // CTS status change
296 #define IRQ_TXREPEAT    BIT9    // tx message repeat
297 #define IRQ_TXFIFO      BIT8    // transmit pool ready
298 #define IRQ_RXEOM       BIT7    // receive message end
299 #define IRQ_EXITHUNT    BIT6    // receive frame start
300 #define IRQ_RXTIME      BIT6    // rx char timeout
301 #define IRQ_DCD         BIT2    // carrier detect status change
302 #define IRQ_OVERRUN     BIT1    // receive frame overflow
303 #define IRQ_RXFIFO      BIT0    // receive pool full
304
305 // STAR
306
307 #define XFW   BIT6              // transmit FIFO write enable
308 #define CEC   BIT2              // command executing
309 #define CTS   BIT1              // CTS state
310
311 #define PVR_DTR      BIT0
312 #define PVR_DSR      BIT1
313 #define PVR_RI       BIT2
314 #define PVR_AUTOCTS  BIT3
315 #define PVR_RS232    0x20   /* 0010b */
316 #define PVR_V35      0xe0   /* 1110b */
317 #define PVR_RS422    0x40   /* 0100b */
318
319 /* Register access functions */
320
321 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
322 #define read_reg(info, reg) inb((info)->io_base + (reg))
323
324 #define read_reg16(info, reg) inw((info)->io_base + (reg))
325 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
326
327 #define set_reg_bits(info, reg, mask) \
328         write_reg(info, (reg), \
329                  (unsigned char) (read_reg(info, (reg)) | (mask)))
330 #define clear_reg_bits(info, reg, mask) \
331         write_reg(info, (reg), \
332                  (unsigned char) (read_reg(info, (reg)) & ~(mask)))
333 /*
334  * interrupt enable/disable routines
335  */
336 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
337 {
338         if (channel == CHA) {
339                 info->imra_value |= mask;
340                 write_reg16(info, CHA + IMR, info->imra_value);
341         } else {
342                 info->imrb_value |= mask;
343                 write_reg16(info, CHB + IMR, info->imrb_value);
344         }
345 }
346 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
347 {
348         if (channel == CHA) {
349                 info->imra_value &= ~mask;
350                 write_reg16(info, CHA + IMR, info->imra_value);
351         } else {
352                 info->imrb_value &= ~mask;
353                 write_reg16(info, CHB + IMR, info->imrb_value);
354         }
355 }
356
357 #define port_irq_disable(info, mask) \
358         { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
359
360 #define port_irq_enable(info, mask) \
361         { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
362
363 static void rx_start(MGSLPC_INFO *info);
364 static void rx_stop(MGSLPC_INFO *info);
365
366 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
367 static void tx_stop(MGSLPC_INFO *info);
368 static void tx_set_idle(MGSLPC_INFO *info);
369
370 static void get_signals(MGSLPC_INFO *info);
371 static void set_signals(MGSLPC_INFO *info);
372
373 static void reset_device(MGSLPC_INFO *info);
374
375 static void hdlc_mode(MGSLPC_INFO *info);
376 static void async_mode(MGSLPC_INFO *info);
377
378 static void tx_timeout(unsigned long context);
379
380 static int carrier_raised(struct tty_port *port);
381 static void dtr_rts(struct tty_port *port, int onoff);
382
383 #if SYNCLINK_GENERIC_HDLC
384 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
385 static void hdlcdev_tx_done(MGSLPC_INFO *info);
386 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
387 static int  hdlcdev_init(MGSLPC_INFO *info);
388 static void hdlcdev_exit(MGSLPC_INFO *info);
389 #endif
390
391 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
392
393 static bool register_test(MGSLPC_INFO *info);
394 static bool irq_test(MGSLPC_INFO *info);
395 static int adapter_test(MGSLPC_INFO *info);
396
397 static int claim_resources(MGSLPC_INFO *info);
398 static void release_resources(MGSLPC_INFO *info);
399 static int mgslpc_add_device(MGSLPC_INFO *info);
400 static void mgslpc_remove_device(MGSLPC_INFO *info);
401
402 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
403 static void rx_reset_buffers(MGSLPC_INFO *info);
404 static int  rx_alloc_buffers(MGSLPC_INFO *info);
405 static void rx_free_buffers(MGSLPC_INFO *info);
406
407 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
408
409 /*
410  * Bottom half interrupt handlers
411  */
412 static void bh_handler(struct work_struct *work);
413 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
414 static void bh_status(MGSLPC_INFO *info);
415
416 /*
417  * ioctl handlers
418  */
419 static int tiocmget(struct tty_struct *tty);
420 static int tiocmset(struct tty_struct *tty,
421                                         unsigned int set, unsigned int clear);
422 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
423 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
424 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
425 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
426 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
427 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
428 static int tx_abort(MGSLPC_INFO *info);
429 static int set_rxenable(MGSLPC_INFO *info, int enable);
430 static int wait_events(MGSLPC_INFO *info, int __user *mask);
431
432 static MGSLPC_INFO *mgslpc_device_list = NULL;
433 static int mgslpc_device_count = 0;
434
435 /*
436  * Set this param to non-zero to load eax with the
437  * .text section address and breakpoint on module load.
438  * This is useful for use with gdb and add-symbol-file command.
439  */
440 static bool break_on_load=0;
441
442 /*
443  * Driver major number, defaults to zero to get auto
444  * assigned major number. May be forced as module parameter.
445  */
446 static int ttymajor=0;
447
448 static int debug_level = 0;
449 static int maxframe[MAX_DEVICE_COUNT] = {0,};
450
451 module_param(break_on_load, bool, 0);
452 module_param(ttymajor, int, 0);
453 module_param(debug_level, int, 0);
454 module_param_array(maxframe, int, NULL, 0);
455
456 MODULE_LICENSE("GPL");
457
458 static char *driver_name = "SyncLink PC Card driver";
459 static char *driver_version = "$Revision: 4.34 $";
460
461 static struct tty_driver *serial_driver;
462
463 /* number of characters left in xmit buffer before we ask for more */
464 #define WAKEUP_CHARS 256
465
466 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
467 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
468
469 /* PCMCIA prototypes */
470
471 static int mgslpc_config(struct pcmcia_device *link);
472 static void mgslpc_release(u_long arg);
473 static void mgslpc_detach(struct pcmcia_device *p_dev);
474
475 /*
476  * 1st function defined in .text section. Calling this function in
477  * init_module() followed by a breakpoint allows a remote debugger
478  * (gdb) to get the .text address for the add-symbol-file command.
479  * This allows remote debugging of dynamically loadable modules.
480  */
481 static void* mgslpc_get_text_ptr(void)
482 {
483         return mgslpc_get_text_ptr;
484 }
485
486 /**
487  * line discipline callback wrappers
488  *
489  * The wrappers maintain line discipline references
490  * while calling into the line discipline.
491  *
492  * ldisc_receive_buf  - pass receive data to line discipline
493  */
494
495 static void ldisc_receive_buf(struct tty_struct *tty,
496                               const __u8 *data, char *flags, int count)
497 {
498         struct tty_ldisc *ld;
499         if (!tty)
500                 return;
501         ld = tty_ldisc_ref(tty);
502         if (ld) {
503                 if (ld->ops->receive_buf)
504                         ld->ops->receive_buf(tty, data, flags, count);
505                 tty_ldisc_deref(ld);
506         }
507 }
508
509 static const struct tty_port_operations mgslpc_port_ops = {
510         .carrier_raised = carrier_raised,
511         .dtr_rts = dtr_rts
512 };
513
514 static int mgslpc_probe(struct pcmcia_device *link)
515 {
516         MGSLPC_INFO *info;
517         int ret;
518
519         if (debug_level >= DEBUG_LEVEL_INFO)
520                 printk("mgslpc_attach\n");
521
522         info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
523         if (!info) {
524                 printk("Error can't allocate device instance data\n");
525                 return -ENOMEM;
526         }
527
528         info->magic = MGSLPC_MAGIC;
529         tty_port_init(&info->port);
530         info->port.ops = &mgslpc_port_ops;
531         INIT_WORK(&info->task, bh_handler);
532         info->max_frame_size = 4096;
533         info->port.close_delay = 5*HZ/10;
534         info->port.closing_wait = 30*HZ;
535         init_waitqueue_head(&info->status_event_wait_q);
536         init_waitqueue_head(&info->event_wait_q);
537         spin_lock_init(&info->lock);
538         spin_lock_init(&info->netlock);
539         memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
540         info->idle_mode = HDLC_TXIDLE_FLAGS;
541         info->imra_value = 0xffff;
542         info->imrb_value = 0xffff;
543         info->pim_value = 0xff;
544
545         info->p_dev = link;
546         link->priv = info;
547
548         /* Initialize the struct pcmcia_device structure */
549
550         ret = mgslpc_config(link);
551         if (ret != 0)
552                 goto failed;
553
554         ret = mgslpc_add_device(info);
555         if (ret != 0)
556                 goto failed_release;
557
558         return 0;
559
560 failed_release:
561         mgslpc_release((u_long)link);
562 failed:
563         tty_port_destroy(&info->port);
564         kfree(info);
565         return ret;
566 }
567
568 /* Card has been inserted.
569  */
570
571 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
572 {
573         return pcmcia_request_io(p_dev);
574 }
575
576 static int mgslpc_config(struct pcmcia_device *link)
577 {
578         MGSLPC_INFO *info = link->priv;
579         int ret;
580
581         if (debug_level >= DEBUG_LEVEL_INFO)
582                 printk("mgslpc_config(0x%p)\n", link);
583
584         link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
585
586         ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
587         if (ret != 0)
588                 goto failed;
589
590         link->config_index = 8;
591         link->config_regs = PRESENT_OPTION;
592
593         ret = pcmcia_request_irq(link, mgslpc_isr);
594         if (ret)
595                 goto failed;
596         ret = pcmcia_enable_device(link);
597         if (ret)
598                 goto failed;
599
600         info->io_base = link->resource[0]->start;
601         info->irq_level = link->irq;
602         return 0;
603
604 failed:
605         mgslpc_release((u_long)link);
606         return -ENODEV;
607 }
608
609 /* Card has been removed.
610  * Unregister device and release PCMCIA configuration.
611  * If device is open, postpone until it is closed.
612  */
613 static void mgslpc_release(u_long arg)
614 {
615         struct pcmcia_device *link = (struct pcmcia_device *)arg;
616
617         if (debug_level >= DEBUG_LEVEL_INFO)
618                 printk("mgslpc_release(0x%p)\n", link);
619
620         pcmcia_disable_device(link);
621 }
622
623 static void mgslpc_detach(struct pcmcia_device *link)
624 {
625         if (debug_level >= DEBUG_LEVEL_INFO)
626                 printk("mgslpc_detach(0x%p)\n", link);
627
628         ((MGSLPC_INFO *)link->priv)->stop = 1;
629         mgslpc_release((u_long)link);
630
631         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
632 }
633
634 static int mgslpc_suspend(struct pcmcia_device *link)
635 {
636         MGSLPC_INFO *info = link->priv;
637
638         info->stop = 1;
639
640         return 0;
641 }
642
643 static int mgslpc_resume(struct pcmcia_device *link)
644 {
645         MGSLPC_INFO *info = link->priv;
646
647         info->stop = 0;
648
649         return 0;
650 }
651
652
653 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
654                                         char *name, const char *routine)
655 {
656 #ifdef MGSLPC_PARANOIA_CHECK
657         static const char *badmagic =
658                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
659         static const char *badinfo =
660                 "Warning: null mgslpc_info for (%s) in %s\n";
661
662         if (!info) {
663                 printk(badinfo, name, routine);
664                 return true;
665         }
666         if (info->magic != MGSLPC_MAGIC) {
667                 printk(badmagic, name, routine);
668                 return true;
669         }
670 #else
671         if (!info)
672                 return true;
673 #endif
674         return false;
675 }
676
677
678 #define CMD_RXFIFO      BIT7    // release current rx FIFO
679 #define CMD_RXRESET     BIT6    // receiver reset
680 #define CMD_RXFIFO_READ BIT5
681 #define CMD_START_TIMER BIT4
682 #define CMD_TXFIFO      BIT3    // release current tx FIFO
683 #define CMD_TXEOM       BIT1    // transmit end message
684 #define CMD_TXRESET     BIT0    // transmit reset
685
686 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
687 {
688         int i = 0;
689         /* wait for command completion */
690         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
691                 udelay(1);
692                 if (i++ == 1000)
693                         return false;
694         }
695         return true;
696 }
697
698 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
699 {
700         wait_command_complete(info, channel);
701         write_reg(info, (unsigned char) (channel + CMDR), cmd);
702 }
703
704 static void tx_pause(struct tty_struct *tty)
705 {
706         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
707         unsigned long flags;
708
709         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
710                 return;
711         if (debug_level >= DEBUG_LEVEL_INFO)
712                 printk("tx_pause(%s)\n", info->device_name);
713
714         spin_lock_irqsave(&info->lock, flags);
715         if (info->tx_enabled)
716                 tx_stop(info);
717         spin_unlock_irqrestore(&info->lock, flags);
718 }
719
720 static void tx_release(struct tty_struct *tty)
721 {
722         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
723         unsigned long flags;
724
725         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
726                 return;
727         if (debug_level >= DEBUG_LEVEL_INFO)
728                 printk("tx_release(%s)\n", info->device_name);
729
730         spin_lock_irqsave(&info->lock, flags);
731         if (!info->tx_enabled)
732                 tx_start(info, tty);
733         spin_unlock_irqrestore(&info->lock, flags);
734 }
735
736 /* Return next bottom half action to perform.
737  * or 0 if nothing to do.
738  */
739 static int bh_action(MGSLPC_INFO *info)
740 {
741         unsigned long flags;
742         int rc = 0;
743
744         spin_lock_irqsave(&info->lock, flags);
745
746         if (info->pending_bh & BH_RECEIVE) {
747                 info->pending_bh &= ~BH_RECEIVE;
748                 rc = BH_RECEIVE;
749         } else if (info->pending_bh & BH_TRANSMIT) {
750                 info->pending_bh &= ~BH_TRANSMIT;
751                 rc = BH_TRANSMIT;
752         } else if (info->pending_bh & BH_STATUS) {
753                 info->pending_bh &= ~BH_STATUS;
754                 rc = BH_STATUS;
755         }
756
757         if (!rc) {
758                 /* Mark BH routine as complete */
759                 info->bh_running = false;
760                 info->bh_requested = false;
761         }
762
763         spin_unlock_irqrestore(&info->lock, flags);
764
765         return rc;
766 }
767
768 static void bh_handler(struct work_struct *work)
769 {
770         MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
771         struct tty_struct *tty;
772         int action;
773
774         if (debug_level >= DEBUG_LEVEL_BH)
775                 printk("%s(%d):bh_handler(%s) entry\n",
776                         __FILE__,__LINE__,info->device_name);
777
778         info->bh_running = true;
779         tty = tty_port_tty_get(&info->port);
780
781         while((action = bh_action(info)) != 0) {
782
783                 /* Process work item */
784                 if (debug_level >= DEBUG_LEVEL_BH)
785                         printk("%s(%d):bh_handler() work item action=%d\n",
786                                 __FILE__,__LINE__,action);
787
788                 switch (action) {
789
790                 case BH_RECEIVE:
791                         while(rx_get_frame(info, tty));
792                         break;
793                 case BH_TRANSMIT:
794                         bh_transmit(info, tty);
795                         break;
796                 case BH_STATUS:
797                         bh_status(info);
798                         break;
799                 default:
800                         /* unknown work item ID */
801                         printk("Unknown work item ID=%08X!\n", action);
802                         break;
803                 }
804         }
805
806         tty_kref_put(tty);
807         if (debug_level >= DEBUG_LEVEL_BH)
808                 printk("%s(%d):bh_handler(%s) exit\n",
809                         __FILE__,__LINE__,info->device_name);
810 }
811
812 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
813 {
814         if (debug_level >= DEBUG_LEVEL_BH)
815                 printk("bh_transmit() entry on %s\n", info->device_name);
816
817         if (tty)
818                 tty_wakeup(tty);
819 }
820
821 static void bh_status(MGSLPC_INFO *info)
822 {
823         info->ri_chkcount = 0;
824         info->dsr_chkcount = 0;
825         info->dcd_chkcount = 0;
826         info->cts_chkcount = 0;
827 }
828
829 /* eom: non-zero = end of frame */
830 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
831 {
832         unsigned char data[2];
833         unsigned char fifo_count, read_count, i;
834         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
835
836         if (debug_level >= DEBUG_LEVEL_ISR)
837                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n", __FILE__, __LINE__, eom);
838
839         if (!info->rx_enabled)
840                 return;
841
842         if (info->rx_frame_count >= info->rx_buf_count) {
843                 /* no more free buffers */
844                 issue_command(info, CHA, CMD_RXRESET);
845                 info->pending_bh |= BH_RECEIVE;
846                 info->rx_overflow = true;
847                 info->icount.buf_overrun++;
848                 return;
849         }
850
851         if (eom) {
852                 /* end of frame, get FIFO count from RBCL register */
853                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
854                 if (fifo_count == 0)
855                         fifo_count = 32;
856         } else
857                 fifo_count = 32;
858
859         do {
860                 if (fifo_count == 1) {
861                         read_count = 1;
862                         data[0] = read_reg(info, CHA + RXFIFO);
863                 } else {
864                         read_count = 2;
865                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
866                 }
867                 fifo_count -= read_count;
868                 if (!fifo_count && eom)
869                         buf->status = data[--read_count];
870
871                 for (i = 0; i < read_count; i++) {
872                         if (buf->count >= info->max_frame_size) {
873                                 /* frame too large, reset receiver and reset current buffer */
874                                 issue_command(info, CHA, CMD_RXRESET);
875                                 buf->count = 0;
876                                 return;
877                         }
878                         *(buf->data + buf->count) = data[i];
879                         buf->count++;
880                 }
881         } while (fifo_count);
882
883         if (eom) {
884                 info->pending_bh |= BH_RECEIVE;
885                 info->rx_frame_count++;
886                 info->rx_put++;
887                 if (info->rx_put >= info->rx_buf_count)
888                         info->rx_put = 0;
889         }
890         issue_command(info, CHA, CMD_RXFIFO);
891 }
892
893 static void rx_ready_async(MGSLPC_INFO *info, int tcd)
894 {
895         struct tty_port *port = &info->port;
896         unsigned char data, status, flag;
897         int fifo_count;
898         int work = 0;
899         struct mgsl_icount *icount = &info->icount;
900
901         if (tcd) {
902                 /* early termination, get FIFO count from RBCL register */
903                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
904
905                 /* Zero fifo count could mean 0 or 32 bytes available.
906                  * If BIT5 of STAR is set then at least 1 byte is available.
907                  */
908                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
909                         fifo_count = 32;
910         } else
911                 fifo_count = 32;
912
913         tty_buffer_request_room(port, fifo_count);
914         /* Flush received async data to receive data buffer. */
915         while (fifo_count) {
916                 data   = read_reg(info, CHA + RXFIFO);
917                 status = read_reg(info, CHA + RXFIFO);
918                 fifo_count -= 2;
919
920                 icount->rx++;
921                 flag = TTY_NORMAL;
922
923                 // if no frameing/crc error then save data
924                 // BIT7:parity error
925                 // BIT6:framing error
926
927                 if (status & (BIT7 + BIT6)) {
928                         if (status & BIT7)
929                                 icount->parity++;
930                         else
931                                 icount->frame++;
932
933                         /* discard char if tty control flags say so */
934                         if (status & info->ignore_status_mask)
935                                 continue;
936
937                         status &= info->read_status_mask;
938
939                         if (status & BIT7)
940                                 flag = TTY_PARITY;
941                         else if (status & BIT6)
942                                 flag = TTY_FRAME;
943                 }
944                 work += tty_insert_flip_char(port, data, flag);
945         }
946         issue_command(info, CHA, CMD_RXFIFO);
947
948         if (debug_level >= DEBUG_LEVEL_ISR) {
949                 printk("%s(%d):rx_ready_async",
950                         __FILE__,__LINE__);
951                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
952                         __FILE__,__LINE__,icount->rx,icount->brk,
953                         icount->parity,icount->frame,icount->overrun);
954         }
955
956         if (work)
957                 tty_flip_buffer_push(port);
958 }
959
960
961 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
962 {
963         if (!info->tx_active)
964                 return;
965
966         info->tx_active = false;
967         info->tx_aborting = false;
968
969         if (info->params.mode == MGSL_MODE_ASYNC)
970                 return;
971
972         info->tx_count = info->tx_put = info->tx_get = 0;
973         del_timer(&info->tx_timer);
974
975         if (info->drop_rts_on_tx_done) {
976                 get_signals(info);
977                 if (info->serial_signals & SerialSignal_RTS) {
978                         info->serial_signals &= ~SerialSignal_RTS;
979                         set_signals(info);
980                 }
981                 info->drop_rts_on_tx_done = false;
982         }
983
984 #if SYNCLINK_GENERIC_HDLC
985         if (info->netcount)
986                 hdlcdev_tx_done(info);
987         else
988 #endif
989         {
990                 if (tty && (tty->stopped || tty->hw_stopped)) {
991                         tx_stop(info);
992                         return;
993                 }
994                 info->pending_bh |= BH_TRANSMIT;
995         }
996 }
997
998 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
999 {
1000         unsigned char fifo_count = 32;
1001         int c;
1002
1003         if (debug_level >= DEBUG_LEVEL_ISR)
1004                 printk("%s(%d):tx_ready(%s)\n", __FILE__, __LINE__, info->device_name);
1005
1006         if (info->params.mode == MGSL_MODE_HDLC) {
1007                 if (!info->tx_active)
1008                         return;
1009         } else {
1010                 if (tty && (tty->stopped || tty->hw_stopped)) {
1011                         tx_stop(info);
1012                         return;
1013                 }
1014                 if (!info->tx_count)
1015                         info->tx_active = false;
1016         }
1017
1018         if (!info->tx_count)
1019                 return;
1020
1021         while (info->tx_count && fifo_count) {
1022                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1023
1024                 if (c == 1) {
1025                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1026                 } else {
1027                         write_reg16(info, CHA + TXFIFO,
1028                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1029                 }
1030                 info->tx_count -= c;
1031                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1032                 fifo_count -= c;
1033         }
1034
1035         if (info->params.mode == MGSL_MODE_ASYNC) {
1036                 if (info->tx_count < WAKEUP_CHARS)
1037                         info->pending_bh |= BH_TRANSMIT;
1038                 issue_command(info, CHA, CMD_TXFIFO);
1039         } else {
1040                 if (info->tx_count)
1041                         issue_command(info, CHA, CMD_TXFIFO);
1042                 else
1043                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1044         }
1045 }
1046
1047 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1048 {
1049         get_signals(info);
1050         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1051                 irq_disable(info, CHB, IRQ_CTS);
1052         info->icount.cts++;
1053         if (info->serial_signals & SerialSignal_CTS)
1054                 info->input_signal_events.cts_up++;
1055         else
1056                 info->input_signal_events.cts_down++;
1057         wake_up_interruptible(&info->status_event_wait_q);
1058         wake_up_interruptible(&info->event_wait_q);
1059
1060         if (tty && tty_port_cts_enabled(&info->port)) {
1061                 if (tty->hw_stopped) {
1062                         if (info->serial_signals & SerialSignal_CTS) {
1063                                 if (debug_level >= DEBUG_LEVEL_ISR)
1064                                         printk("CTS tx start...");
1065                                 tty->hw_stopped = 0;
1066                                 tx_start(info, tty);
1067                                 info->pending_bh |= BH_TRANSMIT;
1068                                 return;
1069                         }
1070                 } else {
1071                         if (!(info->serial_signals & SerialSignal_CTS)) {
1072                                 if (debug_level >= DEBUG_LEVEL_ISR)
1073                                         printk("CTS tx stop...");
1074                                 tty->hw_stopped = 1;
1075                                 tx_stop(info);
1076                         }
1077                 }
1078         }
1079         info->pending_bh |= BH_STATUS;
1080 }
1081
1082 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1083 {
1084         get_signals(info);
1085         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1086                 irq_disable(info, CHB, IRQ_DCD);
1087         info->icount.dcd++;
1088         if (info->serial_signals & SerialSignal_DCD) {
1089                 info->input_signal_events.dcd_up++;
1090         }
1091         else
1092                 info->input_signal_events.dcd_down++;
1093 #if SYNCLINK_GENERIC_HDLC
1094         if (info->netcount) {
1095                 if (info->serial_signals & SerialSignal_DCD)
1096                         netif_carrier_on(info->netdev);
1097                 else
1098                         netif_carrier_off(info->netdev);
1099         }
1100 #endif
1101         wake_up_interruptible(&info->status_event_wait_q);
1102         wake_up_interruptible(&info->event_wait_q);
1103
1104         if (info->port.flags & ASYNC_CHECK_CD) {
1105                 if (debug_level >= DEBUG_LEVEL_ISR)
1106                         printk("%s CD now %s...", info->device_name,
1107                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1108                 if (info->serial_signals & SerialSignal_DCD)
1109                         wake_up_interruptible(&info->port.open_wait);
1110                 else {
1111                         if (debug_level >= DEBUG_LEVEL_ISR)
1112                                 printk("doing serial hangup...");
1113                         if (tty)
1114                                 tty_hangup(tty);
1115                 }
1116         }
1117         info->pending_bh |= BH_STATUS;
1118 }
1119
1120 static void dsr_change(MGSLPC_INFO *info)
1121 {
1122         get_signals(info);
1123         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1124                 port_irq_disable(info, PVR_DSR);
1125         info->icount.dsr++;
1126         if (info->serial_signals & SerialSignal_DSR)
1127                 info->input_signal_events.dsr_up++;
1128         else
1129                 info->input_signal_events.dsr_down++;
1130         wake_up_interruptible(&info->status_event_wait_q);
1131         wake_up_interruptible(&info->event_wait_q);
1132         info->pending_bh |= BH_STATUS;
1133 }
1134
1135 static void ri_change(MGSLPC_INFO *info)
1136 {
1137         get_signals(info);
1138         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1139                 port_irq_disable(info, PVR_RI);
1140         info->icount.rng++;
1141         if (info->serial_signals & SerialSignal_RI)
1142                 info->input_signal_events.ri_up++;
1143         else
1144                 info->input_signal_events.ri_down++;
1145         wake_up_interruptible(&info->status_event_wait_q);
1146         wake_up_interruptible(&info->event_wait_q);
1147         info->pending_bh |= BH_STATUS;
1148 }
1149
1150 /* Interrupt service routine entry point.
1151  *
1152  * Arguments:
1153  *
1154  * irq     interrupt number that caused interrupt
1155  * dev_id  device ID supplied during interrupt registration
1156  */
1157 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1158 {
1159         MGSLPC_INFO *info = dev_id;
1160         struct tty_struct *tty;
1161         unsigned short isr;
1162         unsigned char gis, pis;
1163         int count=0;
1164
1165         if (debug_level >= DEBUG_LEVEL_ISR)
1166                 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1167
1168         if (!(info->p_dev->_locked))
1169                 return IRQ_HANDLED;
1170
1171         tty = tty_port_tty_get(&info->port);
1172
1173         spin_lock(&info->lock);
1174
1175         while ((gis = read_reg(info, CHA + GIS))) {
1176                 if (debug_level >= DEBUG_LEVEL_ISR)
1177                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1178
1179                 if ((gis & 0x70) || count > 1000) {
1180                         printk("synclink_cs:hardware failed or ejected\n");
1181                         break;
1182                 }
1183                 count++;
1184
1185                 if (gis & (BIT1 + BIT0)) {
1186                         isr = read_reg16(info, CHB + ISR);
1187                         if (isr & IRQ_DCD)
1188                                 dcd_change(info, tty);
1189                         if (isr & IRQ_CTS)
1190                                 cts_change(info, tty);
1191                 }
1192                 if (gis & (BIT3 + BIT2))
1193                 {
1194                         isr = read_reg16(info, CHA + ISR);
1195                         if (isr & IRQ_TIMER) {
1196                                 info->irq_occurred = true;
1197                                 irq_disable(info, CHA, IRQ_TIMER);
1198                         }
1199
1200                         /* receive IRQs */
1201                         if (isr & IRQ_EXITHUNT) {
1202                                 info->icount.exithunt++;
1203                                 wake_up_interruptible(&info->event_wait_q);
1204                         }
1205                         if (isr & IRQ_BREAK_ON) {
1206                                 info->icount.brk++;
1207                                 if (info->port.flags & ASYNC_SAK)
1208                                         do_SAK(tty);
1209                         }
1210                         if (isr & IRQ_RXTIME) {
1211                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1212                         }
1213                         if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1214                                 if (info->params.mode == MGSL_MODE_HDLC)
1215                                         rx_ready_hdlc(info, isr & IRQ_RXEOM);
1216                                 else
1217                                         rx_ready_async(info, isr & IRQ_RXEOM);
1218                         }
1219
1220                         /* transmit IRQs */
1221                         if (isr & IRQ_UNDERRUN) {
1222                                 if (info->tx_aborting)
1223                                         info->icount.txabort++;
1224                                 else
1225                                         info->icount.txunder++;
1226                                 tx_done(info, tty);
1227                         }
1228                         else if (isr & IRQ_ALLSENT) {
1229                                 info->icount.txok++;
1230                                 tx_done(info, tty);
1231                         }
1232                         else if (isr & IRQ_TXFIFO)
1233                                 tx_ready(info, tty);
1234                 }
1235                 if (gis & BIT7) {
1236                         pis = read_reg(info, CHA + PIS);
1237                         if (pis & BIT1)
1238                                 dsr_change(info);
1239                         if (pis & BIT2)
1240                                 ri_change(info);
1241                 }
1242         }
1243
1244         /* Request bottom half processing if there's something
1245          * for it to do and the bh is not already running
1246          */
1247
1248         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1249                 if (debug_level >= DEBUG_LEVEL_ISR)
1250                         printk("%s(%d):%s queueing bh task.\n",
1251                                 __FILE__,__LINE__,info->device_name);
1252                 schedule_work(&info->task);
1253                 info->bh_requested = true;
1254         }
1255
1256         spin_unlock(&info->lock);
1257         tty_kref_put(tty);
1258
1259         if (debug_level >= DEBUG_LEVEL_ISR)
1260                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1261                        __FILE__, __LINE__, info->irq_level);
1262
1263         return IRQ_HANDLED;
1264 }
1265
1266 /* Initialize and start device.
1267  */
1268 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1269 {
1270         int retval = 0;
1271
1272         if (debug_level >= DEBUG_LEVEL_INFO)
1273                 printk("%s(%d):startup(%s)\n", __FILE__, __LINE__, info->device_name);
1274
1275         if (info->port.flags & ASYNC_INITIALIZED)
1276                 return 0;
1277
1278         if (!info->tx_buf) {
1279                 /* allocate a page of memory for a transmit buffer */
1280                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1281                 if (!info->tx_buf) {
1282                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1283                                 __FILE__, __LINE__, info->device_name);
1284                         return -ENOMEM;
1285                 }
1286         }
1287
1288         info->pending_bh = 0;
1289
1290         memset(&info->icount, 0, sizeof(info->icount));
1291
1292         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1293
1294         /* Allocate and claim adapter resources */
1295         retval = claim_resources(info);
1296
1297         /* perform existence check and diagnostics */
1298         if (!retval)
1299                 retval = adapter_test(info);
1300
1301         if (retval) {
1302                 if (capable(CAP_SYS_ADMIN) && tty)
1303                         set_bit(TTY_IO_ERROR, &tty->flags);
1304                 release_resources(info);
1305                 return retval;
1306         }
1307
1308         /* program hardware for current parameters */
1309         mgslpc_change_params(info, tty);
1310
1311         if (tty)
1312                 clear_bit(TTY_IO_ERROR, &tty->flags);
1313
1314         info->port.flags |= ASYNC_INITIALIZED;
1315
1316         return 0;
1317 }
1318
1319 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1320  */
1321 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1322 {
1323         unsigned long flags;
1324
1325         if (!(info->port.flags & ASYNC_INITIALIZED))
1326                 return;
1327
1328         if (debug_level >= DEBUG_LEVEL_INFO)
1329                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1330                          __FILE__, __LINE__, info->device_name);
1331
1332         /* clear status wait queue because status changes */
1333         /* can't happen after shutting down the hardware */
1334         wake_up_interruptible(&info->status_event_wait_q);
1335         wake_up_interruptible(&info->event_wait_q);
1336
1337         del_timer_sync(&info->tx_timer);
1338
1339         if (info->tx_buf) {
1340                 free_page((unsigned long) info->tx_buf);
1341                 info->tx_buf = NULL;
1342         }
1343
1344         spin_lock_irqsave(&info->lock, flags);
1345
1346         rx_stop(info);
1347         tx_stop(info);
1348
1349         /* TODO:disable interrupts instead of reset to preserve signal states */
1350         reset_device(info);
1351
1352         if (!tty || tty->termios.c_cflag & HUPCL) {
1353                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1354                 set_signals(info);
1355         }
1356
1357         spin_unlock_irqrestore(&info->lock, flags);
1358
1359         release_resources(info);
1360
1361         if (tty)
1362                 set_bit(TTY_IO_ERROR, &tty->flags);
1363
1364         info->port.flags &= ~ASYNC_INITIALIZED;
1365 }
1366
1367 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1368 {
1369         unsigned long flags;
1370
1371         spin_lock_irqsave(&info->lock, flags);
1372
1373         rx_stop(info);
1374         tx_stop(info);
1375         info->tx_count = info->tx_put = info->tx_get = 0;
1376
1377         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1378                 hdlc_mode(info);
1379         else
1380                 async_mode(info);
1381
1382         set_signals(info);
1383
1384         info->dcd_chkcount = 0;
1385         info->cts_chkcount = 0;
1386         info->ri_chkcount = 0;
1387         info->dsr_chkcount = 0;
1388
1389         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1390         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1391         get_signals(info);
1392
1393         if (info->netcount || (tty && (tty->termios.c_cflag & CREAD)))
1394                 rx_start(info);
1395
1396         spin_unlock_irqrestore(&info->lock, flags);
1397 }
1398
1399 /* Reconfigure adapter based on new parameters
1400  */
1401 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1402 {
1403         unsigned cflag;
1404         int bits_per_char;
1405
1406         if (!tty)
1407                 return;
1408
1409         if (debug_level >= DEBUG_LEVEL_INFO)
1410                 printk("%s(%d):mgslpc_change_params(%s)\n",
1411                          __FILE__, __LINE__, info->device_name);
1412
1413         cflag = tty->termios.c_cflag;
1414
1415         /* if B0 rate (hangup) specified then negate RTS and DTR */
1416         /* otherwise assert RTS and DTR */
1417         if (cflag & CBAUD)
1418                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1419         else
1420                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1421
1422         /* byte size and parity */
1423
1424         switch (cflag & CSIZE) {
1425         case CS5: info->params.data_bits = 5; break;
1426         case CS6: info->params.data_bits = 6; break;
1427         case CS7: info->params.data_bits = 7; break;
1428         case CS8: info->params.data_bits = 8; break;
1429         default:  info->params.data_bits = 7; break;
1430         }
1431
1432         if (cflag & CSTOPB)
1433                 info->params.stop_bits = 2;
1434         else
1435                 info->params.stop_bits = 1;
1436
1437         info->params.parity = ASYNC_PARITY_NONE;
1438         if (cflag & PARENB) {
1439                 if (cflag & PARODD)
1440                         info->params.parity = ASYNC_PARITY_ODD;
1441                 else
1442                         info->params.parity = ASYNC_PARITY_EVEN;
1443 #ifdef CMSPAR
1444                 if (cflag & CMSPAR)
1445                         info->params.parity = ASYNC_PARITY_SPACE;
1446 #endif
1447         }
1448
1449         /* calculate number of jiffies to transmit a full
1450          * FIFO (32 bytes) at specified data rate
1451          */
1452         bits_per_char = info->params.data_bits +
1453                         info->params.stop_bits + 1;
1454
1455         /* if port data rate is set to 460800 or less then
1456          * allow tty settings to override, otherwise keep the
1457          * current data rate.
1458          */
1459         if (info->params.data_rate <= 460800) {
1460                 info->params.data_rate = tty_get_baud_rate(tty);
1461         }
1462
1463         if (info->params.data_rate) {
1464                 info->timeout = (32*HZ*bits_per_char) /
1465                                 info->params.data_rate;
1466         }
1467         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1468
1469         if (cflag & CRTSCTS)
1470                 info->port.flags |= ASYNC_CTS_FLOW;
1471         else
1472                 info->port.flags &= ~ASYNC_CTS_FLOW;
1473
1474         if (cflag & CLOCAL)
1475                 info->port.flags &= ~ASYNC_CHECK_CD;
1476         else
1477                 info->port.flags |= ASYNC_CHECK_CD;
1478
1479         /* process tty input control flags */
1480
1481         info->read_status_mask = 0;
1482         if (I_INPCK(tty))
1483                 info->read_status_mask |= BIT7 | BIT6;
1484         if (I_IGNPAR(tty))
1485                 info->ignore_status_mask |= BIT7 | BIT6;
1486
1487         mgslpc_program_hw(info, tty);
1488 }
1489
1490 /* Add a character to the transmit buffer
1491  */
1492 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1493 {
1494         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1495         unsigned long flags;
1496
1497         if (debug_level >= DEBUG_LEVEL_INFO) {
1498                 printk("%s(%d):mgslpc_put_char(%d) on %s\n",
1499                         __FILE__, __LINE__, ch, info->device_name);
1500         }
1501
1502         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1503                 return 0;
1504
1505         if (!info->tx_buf)
1506                 return 0;
1507
1508         spin_lock_irqsave(&info->lock, flags);
1509
1510         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1511                 if (info->tx_count < TXBUFSIZE - 1) {
1512                         info->tx_buf[info->tx_put++] = ch;
1513                         info->tx_put &= TXBUFSIZE-1;
1514                         info->tx_count++;
1515                 }
1516         }
1517
1518         spin_unlock_irqrestore(&info->lock, flags);
1519         return 1;
1520 }
1521
1522 /* Enable transmitter so remaining characters in the
1523  * transmit buffer are sent.
1524  */
1525 static void mgslpc_flush_chars(struct tty_struct *tty)
1526 {
1527         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1528         unsigned long flags;
1529
1530         if (debug_level >= DEBUG_LEVEL_INFO)
1531                 printk("%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1532                         __FILE__, __LINE__, info->device_name, info->tx_count);
1533
1534         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1535                 return;
1536
1537         if (info->tx_count <= 0 || tty->stopped ||
1538             tty->hw_stopped || !info->tx_buf)
1539                 return;
1540
1541         if (debug_level >= DEBUG_LEVEL_INFO)
1542                 printk("%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1543                         __FILE__, __LINE__, info->device_name);
1544
1545         spin_lock_irqsave(&info->lock, flags);
1546         if (!info->tx_active)
1547                 tx_start(info, tty);
1548         spin_unlock_irqrestore(&info->lock, flags);
1549 }
1550
1551 /* Send a block of data
1552  *
1553  * Arguments:
1554  *
1555  * tty        pointer to tty information structure
1556  * buf        pointer to buffer containing send data
1557  * count      size of send data in bytes
1558  *
1559  * Returns: number of characters written
1560  */
1561 static int mgslpc_write(struct tty_struct * tty,
1562                         const unsigned char *buf, int count)
1563 {
1564         int c, ret = 0;
1565         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1566         unsigned long flags;
1567
1568         if (debug_level >= DEBUG_LEVEL_INFO)
1569                 printk("%s(%d):mgslpc_write(%s) count=%d\n",
1570                         __FILE__, __LINE__, info->device_name, count);
1571
1572         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1573                 !info->tx_buf)
1574                 goto cleanup;
1575
1576         if (info->params.mode == MGSL_MODE_HDLC) {
1577                 if (count > TXBUFSIZE) {
1578                         ret = -EIO;
1579                         goto cleanup;
1580                 }
1581                 if (info->tx_active)
1582                         goto cleanup;
1583                 else if (info->tx_count)
1584                         goto start;
1585         }
1586
1587         for (;;) {
1588                 c = min(count,
1589                         min(TXBUFSIZE - info->tx_count - 1,
1590                             TXBUFSIZE - info->tx_put));
1591                 if (c <= 0)
1592                         break;
1593
1594                 memcpy(info->tx_buf + info->tx_put, buf, c);
1595
1596                 spin_lock_irqsave(&info->lock, flags);
1597                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1598                 info->tx_count += c;
1599                 spin_unlock_irqrestore(&info->lock, flags);
1600
1601                 buf += c;
1602                 count -= c;
1603                 ret += c;
1604         }
1605 start:
1606         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1607                 spin_lock_irqsave(&info->lock, flags);
1608                 if (!info->tx_active)
1609                         tx_start(info, tty);
1610                 spin_unlock_irqrestore(&info->lock, flags);
1611         }
1612 cleanup:
1613         if (debug_level >= DEBUG_LEVEL_INFO)
1614                 printk("%s(%d):mgslpc_write(%s) returning=%d\n",
1615                         __FILE__, __LINE__, info->device_name, ret);
1616         return ret;
1617 }
1618
1619 /* Return the count of free bytes in transmit buffer
1620  */
1621 static int mgslpc_write_room(struct tty_struct *tty)
1622 {
1623         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1624         int ret;
1625
1626         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1627                 return 0;
1628
1629         if (info->params.mode == MGSL_MODE_HDLC) {
1630                 /* HDLC (frame oriented) mode */
1631                 if (info->tx_active)
1632                         return 0;
1633                 else
1634                         return HDLC_MAX_FRAME_SIZE;
1635         } else {
1636                 ret = TXBUFSIZE - info->tx_count - 1;
1637                 if (ret < 0)
1638                         ret = 0;
1639         }
1640
1641         if (debug_level >= DEBUG_LEVEL_INFO)
1642                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1643                          __FILE__, __LINE__, info->device_name, ret);
1644         return ret;
1645 }
1646
1647 /* Return the count of bytes in transmit buffer
1648  */
1649 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1650 {
1651         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1652         int rc;
1653
1654         if (debug_level >= DEBUG_LEVEL_INFO)
1655                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1656                          __FILE__, __LINE__, info->device_name);
1657
1658         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1659                 return 0;
1660
1661         if (info->params.mode == MGSL_MODE_HDLC)
1662                 rc = info->tx_active ? info->max_frame_size : 0;
1663         else
1664                 rc = info->tx_count;
1665
1666         if (debug_level >= DEBUG_LEVEL_INFO)
1667                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1668                          __FILE__, __LINE__, info->device_name, rc);
1669
1670         return rc;
1671 }
1672
1673 /* Discard all data in the send buffer
1674  */
1675 static void mgslpc_flush_buffer(struct tty_struct *tty)
1676 {
1677         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1678         unsigned long flags;
1679
1680         if (debug_level >= DEBUG_LEVEL_INFO)
1681                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1682                          __FILE__, __LINE__, info->device_name);
1683
1684         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1685                 return;
1686
1687         spin_lock_irqsave(&info->lock, flags);
1688         info->tx_count = info->tx_put = info->tx_get = 0;
1689         del_timer(&info->tx_timer);
1690         spin_unlock_irqrestore(&info->lock, flags);
1691
1692         wake_up_interruptible(&tty->write_wait);
1693         tty_wakeup(tty);
1694 }
1695
1696 /* Send a high-priority XON/XOFF character
1697  */
1698 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1699 {
1700         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1701         unsigned long flags;
1702
1703         if (debug_level >= DEBUG_LEVEL_INFO)
1704                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1705                          __FILE__, __LINE__, info->device_name, ch);
1706
1707         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1708                 return;
1709
1710         info->x_char = ch;
1711         if (ch) {
1712                 spin_lock_irqsave(&info->lock, flags);
1713                 if (!info->tx_enabled)
1714                         tx_start(info, tty);
1715                 spin_unlock_irqrestore(&info->lock, flags);
1716         }
1717 }
1718
1719 /* Signal remote device to throttle send data (our receive data)
1720  */
1721 static void mgslpc_throttle(struct tty_struct * tty)
1722 {
1723         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1724         unsigned long flags;
1725
1726         if (debug_level >= DEBUG_LEVEL_INFO)
1727                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1728                          __FILE__, __LINE__, info->device_name);
1729
1730         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1731                 return;
1732
1733         if (I_IXOFF(tty))
1734                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1735
1736         if (tty->termios.c_cflag & CRTSCTS) {
1737                 spin_lock_irqsave(&info->lock, flags);
1738                 info->serial_signals &= ~SerialSignal_RTS;
1739                 set_signals(info);
1740                 spin_unlock_irqrestore(&info->lock, flags);
1741         }
1742 }
1743
1744 /* Signal remote device to stop throttling send data (our receive data)
1745  */
1746 static void mgslpc_unthrottle(struct tty_struct * tty)
1747 {
1748         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1749         unsigned long flags;
1750
1751         if (debug_level >= DEBUG_LEVEL_INFO)
1752                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1753                          __FILE__, __LINE__, info->device_name);
1754
1755         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1756                 return;
1757
1758         if (I_IXOFF(tty)) {
1759                 if (info->x_char)
1760                         info->x_char = 0;
1761                 else
1762                         mgslpc_send_xchar(tty, START_CHAR(tty));
1763         }
1764
1765         if (tty->termios.c_cflag & CRTSCTS) {
1766                 spin_lock_irqsave(&info->lock, flags);
1767                 info->serial_signals |= SerialSignal_RTS;
1768                 set_signals(info);
1769                 spin_unlock_irqrestore(&info->lock, flags);
1770         }
1771 }
1772
1773 /* get the current serial statistics
1774  */
1775 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1776 {
1777         int err;
1778         if (debug_level >= DEBUG_LEVEL_INFO)
1779                 printk("get_params(%s)\n", info->device_name);
1780         if (!user_icount) {
1781                 memset(&info->icount, 0, sizeof(info->icount));
1782         } else {
1783                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1784                 if (err)
1785                         return -EFAULT;
1786         }
1787         return 0;
1788 }
1789
1790 /* get the current serial parameters
1791  */
1792 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1793 {
1794         int err;
1795         if (debug_level >= DEBUG_LEVEL_INFO)
1796                 printk("get_params(%s)\n", info->device_name);
1797         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1798         if (err)
1799                 return -EFAULT;
1800         return 0;
1801 }
1802
1803 /* set the serial parameters
1804  *
1805  * Arguments:
1806  *
1807  *      info            pointer to device instance data
1808  *      new_params      user buffer containing new serial params
1809  *
1810  * Returns:     0 if success, otherwise error code
1811  */
1812 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1813 {
1814         unsigned long flags;
1815         MGSL_PARAMS tmp_params;
1816         int err;
1817
1818         if (debug_level >= DEBUG_LEVEL_INFO)
1819                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1820                         info->device_name);
1821         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1822         if (err) {
1823                 if (debug_level >= DEBUG_LEVEL_INFO)
1824                         printk("%s(%d):set_params(%s) user buffer copy failed\n",
1825                                 __FILE__, __LINE__, info->device_name);
1826                 return -EFAULT;
1827         }
1828
1829         spin_lock_irqsave(&info->lock, flags);
1830         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1831         spin_unlock_irqrestore(&info->lock, flags);
1832
1833         mgslpc_change_params(info, tty);
1834
1835         return 0;
1836 }
1837
1838 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1839 {
1840         int err;
1841         if (debug_level >= DEBUG_LEVEL_INFO)
1842                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1843         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1844         if (err)
1845                 return -EFAULT;
1846         return 0;
1847 }
1848
1849 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1850 {
1851         unsigned long flags;
1852         if (debug_level >= DEBUG_LEVEL_INFO)
1853                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1854         spin_lock_irqsave(&info->lock, flags);
1855         info->idle_mode = idle_mode;
1856         tx_set_idle(info);
1857         spin_unlock_irqrestore(&info->lock, flags);
1858         return 0;
1859 }
1860
1861 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1862 {
1863         int err;
1864         if (debug_level >= DEBUG_LEVEL_INFO)
1865                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1866         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1867         if (err)
1868                 return -EFAULT;
1869         return 0;
1870 }
1871
1872 static int set_interface(MGSLPC_INFO * info, int if_mode)
1873 {
1874         unsigned long flags;
1875         unsigned char val;
1876         if (debug_level >= DEBUG_LEVEL_INFO)
1877                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1878         spin_lock_irqsave(&info->lock, flags);
1879         info->if_mode = if_mode;
1880
1881         val = read_reg(info, PVR) & 0x0f;
1882         switch (info->if_mode)
1883         {
1884         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1885         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1886         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1887         }
1888         write_reg(info, PVR, val);
1889
1890         spin_unlock_irqrestore(&info->lock, flags);
1891         return 0;
1892 }
1893
1894 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1895 {
1896         unsigned long flags;
1897
1898         if (debug_level >= DEBUG_LEVEL_INFO)
1899                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1900
1901         spin_lock_irqsave(&info->lock, flags);
1902         if (enable) {
1903                 if (!info->tx_enabled)
1904                         tx_start(info, tty);
1905         } else {
1906                 if (info->tx_enabled)
1907                         tx_stop(info);
1908         }
1909         spin_unlock_irqrestore(&info->lock, flags);
1910         return 0;
1911 }
1912
1913 static int tx_abort(MGSLPC_INFO * info)
1914 {
1915         unsigned long flags;
1916
1917         if (debug_level >= DEBUG_LEVEL_INFO)
1918                 printk("tx_abort(%s)\n", info->device_name);
1919
1920         spin_lock_irqsave(&info->lock, flags);
1921         if (info->tx_active && info->tx_count &&
1922             info->params.mode == MGSL_MODE_HDLC) {
1923                 /* clear data count so FIFO is not filled on next IRQ.
1924                  * This results in underrun and abort transmission.
1925                  */
1926                 info->tx_count = info->tx_put = info->tx_get = 0;
1927                 info->tx_aborting = true;
1928         }
1929         spin_unlock_irqrestore(&info->lock, flags);
1930         return 0;
1931 }
1932
1933 static int set_rxenable(MGSLPC_INFO * info, int enable)
1934 {
1935         unsigned long flags;
1936
1937         if (debug_level >= DEBUG_LEVEL_INFO)
1938                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1939
1940         spin_lock_irqsave(&info->lock, flags);
1941         if (enable) {
1942                 if (!info->rx_enabled)
1943                         rx_start(info);
1944         } else {
1945                 if (info->rx_enabled)
1946                         rx_stop(info);
1947         }
1948         spin_unlock_irqrestore(&info->lock, flags);
1949         return 0;
1950 }
1951
1952 /* wait for specified event to occur
1953  *
1954  * Arguments:           info    pointer to device instance data
1955  *                      mask    pointer to bitmask of events to wait for
1956  * Return Value:        0       if successful and bit mask updated with
1957  *                              of events triggerred,
1958  *                      otherwise error code
1959  */
1960 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1961 {
1962         unsigned long flags;
1963         int s;
1964         int rc=0;
1965         struct mgsl_icount cprev, cnow;
1966         int events;
1967         int mask;
1968         struct  _input_signal_events oldsigs, newsigs;
1969         DECLARE_WAITQUEUE(wait, current);
1970
1971         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1972         if (rc)
1973                 return  -EFAULT;
1974
1975         if (debug_level >= DEBUG_LEVEL_INFO)
1976                 printk("wait_events(%s,%d)\n", info->device_name, mask);
1977
1978         spin_lock_irqsave(&info->lock, flags);
1979
1980         /* return immediately if state matches requested events */
1981         get_signals(info);
1982         s = info->serial_signals;
1983         events = mask &
1984                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1985                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1986                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1987                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1988         if (events) {
1989                 spin_unlock_irqrestore(&info->lock, flags);
1990                 goto exit;
1991         }
1992
1993         /* save current irq counts */
1994         cprev = info->icount;
1995         oldsigs = info->input_signal_events;
1996
1997         if ((info->params.mode == MGSL_MODE_HDLC) &&
1998             (mask & MgslEvent_ExitHuntMode))
1999                 irq_enable(info, CHA, IRQ_EXITHUNT);
2000
2001         set_current_state(TASK_INTERRUPTIBLE);
2002         add_wait_queue(&info->event_wait_q, &wait);
2003
2004         spin_unlock_irqrestore(&info->lock, flags);
2005
2006
2007         for(;;) {
2008                 schedule();
2009                 if (signal_pending(current)) {
2010                         rc = -ERESTARTSYS;
2011                         break;
2012                 }
2013
2014                 /* get current irq counts */
2015                 spin_lock_irqsave(&info->lock, flags);
2016                 cnow = info->icount;
2017                 newsigs = info->input_signal_events;
2018                 set_current_state(TASK_INTERRUPTIBLE);
2019                 spin_unlock_irqrestore(&info->lock, flags);
2020
2021                 /* if no change, wait aborted for some reason */
2022                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2023                     newsigs.dsr_down == oldsigs.dsr_down &&
2024                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2025                     newsigs.dcd_down == oldsigs.dcd_down &&
2026                     newsigs.cts_up   == oldsigs.cts_up   &&
2027                     newsigs.cts_down == oldsigs.cts_down &&
2028                     newsigs.ri_up    == oldsigs.ri_up    &&
2029                     newsigs.ri_down  == oldsigs.ri_down  &&
2030                     cnow.exithunt    == cprev.exithunt   &&
2031                     cnow.rxidle      == cprev.rxidle) {
2032                         rc = -EIO;
2033                         break;
2034                 }
2035
2036                 events = mask &
2037                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2038                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2039                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2040                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2041                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2042                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2043                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2044                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2045                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2046                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2047                 if (events)
2048                         break;
2049
2050                 cprev = cnow;
2051                 oldsigs = newsigs;
2052         }
2053
2054         remove_wait_queue(&info->event_wait_q, &wait);
2055         set_current_state(TASK_RUNNING);
2056
2057         if (mask & MgslEvent_ExitHuntMode) {
2058                 spin_lock_irqsave(&info->lock, flags);
2059                 if (!waitqueue_active(&info->event_wait_q))
2060                         irq_disable(info, CHA, IRQ_EXITHUNT);
2061                 spin_unlock_irqrestore(&info->lock, flags);
2062         }
2063 exit:
2064         if (rc == 0)
2065                 PUT_USER(rc, events, mask_ptr);
2066         return rc;
2067 }
2068
2069 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2070 {
2071         unsigned long flags;
2072         int rc;
2073         struct mgsl_icount cprev, cnow;
2074         DECLARE_WAITQUEUE(wait, current);
2075
2076         /* save current irq counts */
2077         spin_lock_irqsave(&info->lock, flags);
2078         cprev = info->icount;
2079         add_wait_queue(&info->status_event_wait_q, &wait);
2080         set_current_state(TASK_INTERRUPTIBLE);
2081         spin_unlock_irqrestore(&info->lock, flags);
2082
2083         for(;;) {
2084                 schedule();
2085                 if (signal_pending(current)) {
2086                         rc = -ERESTARTSYS;
2087                         break;
2088                 }
2089
2090                 /* get new irq counts */
2091                 spin_lock_irqsave(&info->lock, flags);
2092                 cnow = info->icount;
2093                 set_current_state(TASK_INTERRUPTIBLE);
2094                 spin_unlock_irqrestore(&info->lock, flags);
2095
2096                 /* if no change, wait aborted for some reason */
2097                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2098                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2099                         rc = -EIO;
2100                         break;
2101                 }
2102
2103                 /* check for change in caller specified modem input */
2104                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2105                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2106                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2107                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2108                         rc = 0;
2109                         break;
2110                 }
2111
2112                 cprev = cnow;
2113         }
2114         remove_wait_queue(&info->status_event_wait_q, &wait);
2115         set_current_state(TASK_RUNNING);
2116         return rc;
2117 }
2118
2119 /* return the state of the serial control and status signals
2120  */
2121 static int tiocmget(struct tty_struct *tty)
2122 {
2123         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2124         unsigned int result;
2125         unsigned long flags;
2126
2127         spin_lock_irqsave(&info->lock, flags);
2128         get_signals(info);
2129         spin_unlock_irqrestore(&info->lock, flags);
2130
2131         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2132                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2133                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2134                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2135                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2136                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2137
2138         if (debug_level >= DEBUG_LEVEL_INFO)
2139                 printk("%s(%d):%s tiocmget() value=%08X\n",
2140                          __FILE__, __LINE__, info->device_name, result);
2141         return result;
2142 }
2143
2144 /* set modem control signals (DTR/RTS)
2145  */
2146 static int tiocmset(struct tty_struct *tty,
2147                     unsigned int set, unsigned int clear)
2148 {
2149         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2150         unsigned long flags;
2151
2152         if (debug_level >= DEBUG_LEVEL_INFO)
2153                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2154                         __FILE__, __LINE__, info->device_name, set, clear);
2155
2156         if (set & TIOCM_RTS)
2157                 info->serial_signals |= SerialSignal_RTS;
2158         if (set & TIOCM_DTR)
2159                 info->serial_signals |= SerialSignal_DTR;
2160         if (clear & TIOCM_RTS)
2161                 info->serial_signals &= ~SerialSignal_RTS;
2162         if (clear & TIOCM_DTR)
2163                 info->serial_signals &= ~SerialSignal_DTR;
2164
2165         spin_lock_irqsave(&info->lock, flags);
2166         set_signals(info);
2167         spin_unlock_irqrestore(&info->lock, flags);
2168
2169         return 0;
2170 }
2171
2172 /* Set or clear transmit break condition
2173  *
2174  * Arguments:           tty             pointer to tty instance data
2175  *                      break_state     -1=set break condition, 0=clear
2176  */
2177 static int mgslpc_break(struct tty_struct *tty, int break_state)
2178 {
2179         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2180         unsigned long flags;
2181
2182         if (debug_level >= DEBUG_LEVEL_INFO)
2183                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2184                          __FILE__, __LINE__, info->device_name, break_state);
2185
2186         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2187                 return -EINVAL;
2188
2189         spin_lock_irqsave(&info->lock, flags);
2190         if (break_state == -1)
2191                 set_reg_bits(info, CHA+DAFO, BIT6);
2192         else
2193                 clear_reg_bits(info, CHA+DAFO, BIT6);
2194         spin_unlock_irqrestore(&info->lock, flags);
2195         return 0;
2196 }
2197
2198 static int mgslpc_get_icount(struct tty_struct *tty,
2199                                 struct serial_icounter_struct *icount)
2200 {
2201         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2202         struct mgsl_icount cnow;        /* kernel counter temps */
2203         unsigned long flags;
2204
2205         spin_lock_irqsave(&info->lock, flags);
2206         cnow = info->icount;
2207         spin_unlock_irqrestore(&info->lock, flags);
2208
2209         icount->cts = cnow.cts;
2210         icount->dsr = cnow.dsr;
2211         icount->rng = cnow.rng;
2212         icount->dcd = cnow.dcd;
2213         icount->rx = cnow.rx;
2214         icount->tx = cnow.tx;
2215         icount->frame = cnow.frame;
2216         icount->overrun = cnow.overrun;
2217         icount->parity = cnow.parity;
2218         icount->brk = cnow.brk;
2219         icount->buf_overrun = cnow.buf_overrun;
2220
2221         return 0;
2222 }
2223
2224 /* Service an IOCTL request
2225  *
2226  * Arguments:
2227  *
2228  *      tty     pointer to tty instance data
2229  *      cmd     IOCTL command code
2230  *      arg     command argument/context
2231  *
2232  * Return Value:        0 if success, otherwise error code
2233  */
2234 static int mgslpc_ioctl(struct tty_struct *tty,
2235                         unsigned int cmd, unsigned long arg)
2236 {
2237         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2238         void __user *argp = (void __user *)arg;
2239
2240         if (debug_level >= DEBUG_LEVEL_INFO)
2241                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__, __LINE__,
2242                         info->device_name, cmd);
2243
2244         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2245                 return -ENODEV;
2246
2247         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2248             (cmd != TIOCMIWAIT)) {
2249                 if (tty->flags & (1 << TTY_IO_ERROR))
2250                     return -EIO;
2251         }
2252
2253         switch (cmd) {
2254         case MGSL_IOCGPARAMS:
2255                 return get_params(info, argp);
2256         case MGSL_IOCSPARAMS:
2257                 return set_params(info, argp, tty);
2258         case MGSL_IOCGTXIDLE:
2259                 return get_txidle(info, argp);
2260         case MGSL_IOCSTXIDLE:
2261                 return set_txidle(info, (int)arg);
2262         case MGSL_IOCGIF:
2263                 return get_interface(info, argp);
2264         case MGSL_IOCSIF:
2265                 return set_interface(info,(int)arg);
2266         case MGSL_IOCTXENABLE:
2267                 return set_txenable(info,(int)arg, tty);
2268         case MGSL_IOCRXENABLE:
2269                 return set_rxenable(info,(int)arg);
2270         case MGSL_IOCTXABORT:
2271                 return tx_abort(info);
2272         case MGSL_IOCGSTATS:
2273                 return get_stats(info, argp);
2274         case MGSL_IOCWAITEVENT:
2275                 return wait_events(info, argp);
2276         case TIOCMIWAIT:
2277                 return modem_input_wait(info,(int)arg);
2278         default:
2279                 return -ENOIOCTLCMD;
2280         }
2281         return 0;
2282 }
2283
2284 /* Set new termios settings
2285  *
2286  * Arguments:
2287  *
2288  *      tty             pointer to tty structure
2289  *      termios         pointer to buffer to hold returned old termios
2290  */
2291 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2292 {
2293         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2294         unsigned long flags;
2295
2296         if (debug_level >= DEBUG_LEVEL_INFO)
2297                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__, __LINE__,
2298                         tty->driver->name);
2299
2300         /* just return if nothing has changed */
2301         if ((tty->termios.c_cflag == old_termios->c_cflag)
2302             && (RELEVANT_IFLAG(tty->termios.c_iflag)
2303                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2304           return;
2305
2306         mgslpc_change_params(info, tty);
2307
2308         /* Handle transition to B0 status */
2309         if (old_termios->c_cflag & CBAUD &&
2310             !(tty->termios.c_cflag & CBAUD)) {
2311                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2312                 spin_lock_irqsave(&info->lock, flags);
2313                 set_signals(info);
2314                 spin_unlock_irqrestore(&info->lock, flags);
2315         }
2316
2317         /* Handle transition away from B0 status */
2318         if (!(old_termios->c_cflag & CBAUD) &&
2319             tty->termios.c_cflag & CBAUD) {
2320                 info->serial_signals |= SerialSignal_DTR;
2321                 if (!(tty->termios.c_cflag & CRTSCTS) ||
2322                     !test_bit(TTY_THROTTLED, &tty->flags)) {
2323                         info->serial_signals |= SerialSignal_RTS;
2324                 }
2325                 spin_lock_irqsave(&info->lock, flags);
2326                 set_signals(info);
2327                 spin_unlock_irqrestore(&info->lock, flags);
2328         }
2329
2330         /* Handle turning off CRTSCTS */
2331         if (old_termios->c_cflag & CRTSCTS &&
2332             !(tty->termios.c_cflag & CRTSCTS)) {
2333                 tty->hw_stopped = 0;
2334                 tx_release(tty);
2335         }
2336 }
2337
2338 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2339 {
2340         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2341         struct tty_port *port = &info->port;
2342
2343         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2344                 return;
2345
2346         if (debug_level >= DEBUG_LEVEL_INFO)
2347                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2348                          __FILE__, __LINE__, info->device_name, port->count);
2349
2350         WARN_ON(!port->count);
2351
2352         if (tty_port_close_start(port, tty, filp) == 0)
2353                 goto cleanup;
2354
2355         if (port->flags & ASYNC_INITIALIZED)
2356                 mgslpc_wait_until_sent(tty, info->timeout);
2357
2358         mgslpc_flush_buffer(tty);
2359
2360         tty_ldisc_flush(tty);
2361         shutdown(info, tty);
2362         
2363         tty_port_close_end(port, tty);
2364         tty_port_tty_set(port, NULL);
2365 cleanup:
2366         if (debug_level >= DEBUG_LEVEL_INFO)
2367                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__, __LINE__,
2368                         tty->driver->name, port->count);
2369 }
2370
2371 /* Wait until the transmitter is empty.
2372  */
2373 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2374 {
2375         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2376         unsigned long orig_jiffies, char_time;
2377
2378         if (!info)
2379                 return;
2380
2381         if (debug_level >= DEBUG_LEVEL_INFO)
2382                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2383                          __FILE__, __LINE__, info->device_name);
2384
2385         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2386                 return;
2387
2388         if (!(info->port.flags & ASYNC_INITIALIZED))
2389                 goto exit;
2390
2391         orig_jiffies = jiffies;
2392
2393         /* Set check interval to 1/5 of estimated time to
2394          * send a character, and make it at least 1. The check
2395          * interval should also be less than the timeout.
2396          * Note: use tight timings here to satisfy the NIST-PCTS.
2397          */
2398
2399         if (info->params.data_rate) {
2400                 char_time = info->timeout/(32 * 5);
2401                 if (!char_time)
2402                         char_time++;
2403         } else
2404                 char_time = 1;
2405
2406         if (timeout)
2407                 char_time = min_t(unsigned long, char_time, timeout);
2408
2409         if (info->params.mode == MGSL_MODE_HDLC) {
2410                 while (info->tx_active) {
2411                         msleep_interruptible(jiffies_to_msecs(char_time));
2412                         if (signal_pending(current))
2413                                 break;
2414                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2415                                 break;
2416                 }
2417         } else {
2418                 while ((info->tx_count || info->tx_active) &&
2419                         info->tx_enabled) {
2420                         msleep_interruptible(jiffies_to_msecs(char_time));
2421                         if (signal_pending(current))
2422                                 break;
2423                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2424                                 break;
2425                 }
2426         }
2427
2428 exit:
2429         if (debug_level >= DEBUG_LEVEL_INFO)
2430                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2431                          __FILE__, __LINE__, info->device_name);
2432 }
2433
2434 /* Called by tty_hangup() when a hangup is signaled.
2435  * This is the same as closing all open files for the port.
2436  */
2437 static void mgslpc_hangup(struct tty_struct *tty)
2438 {
2439         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2440
2441         if (debug_level >= DEBUG_LEVEL_INFO)
2442                 printk("%s(%d):mgslpc_hangup(%s)\n",
2443                          __FILE__, __LINE__, info->device_name);
2444
2445         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2446                 return;
2447
2448         mgslpc_flush_buffer(tty);
2449         shutdown(info, tty);
2450         tty_port_hangup(&info->port);
2451 }
2452
2453 static int carrier_raised(struct tty_port *port)
2454 {
2455         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2456         unsigned long flags;
2457
2458         spin_lock_irqsave(&info->lock, flags);
2459         get_signals(info);
2460         spin_unlock_irqrestore(&info->lock, flags);
2461
2462         if (info->serial_signals & SerialSignal_DCD)
2463                 return 1;
2464         return 0;
2465 }
2466
2467 static void dtr_rts(struct tty_port *port, int onoff)
2468 {
2469         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2470         unsigned long flags;
2471
2472         spin_lock_irqsave(&info->lock, flags);
2473         if (onoff)
2474                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2475         else
2476                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2477         set_signals(info);
2478         spin_unlock_irqrestore(&info->lock, flags);
2479 }
2480
2481
2482 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2483 {
2484         MGSLPC_INFO     *info;
2485         struct tty_port *port;
2486         int             retval, line;
2487         unsigned long   flags;
2488
2489         /* verify range of specified line number */
2490         line = tty->index;
2491         if (line >= mgslpc_device_count) {
2492                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2493                         __FILE__, __LINE__, line);
2494                 return -ENODEV;
2495         }
2496
2497         /* find the info structure for the specified line */
2498         info = mgslpc_device_list;
2499         while(info && info->line != line)
2500                 info = info->next_device;
2501         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2502                 return -ENODEV;
2503
2504         port = &info->port;
2505         tty->driver_data = info;
2506         tty_port_tty_set(port, tty);
2507
2508         if (debug_level >= DEBUG_LEVEL_INFO)
2509                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2510                          __FILE__, __LINE__, tty->driver->name, port->count);
2511
2512         /* If port is closing, signal caller to try again */
2513         if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2514                 if (port->flags & ASYNC_CLOSING)
2515                         interruptible_sleep_on(&port->close_wait);
2516                 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2517                         -EAGAIN : -ERESTARTSYS);
2518                 goto cleanup;
2519         }
2520
2521         port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2522
2523         spin_lock_irqsave(&info->netlock, flags);
2524         if (info->netcount) {
2525                 retval = -EBUSY;
2526                 spin_unlock_irqrestore(&info->netlock, flags);
2527                 goto cleanup;
2528         }
2529         spin_lock(&port->lock);
2530         port->count++;
2531         spin_unlock(&port->lock);
2532         spin_unlock_irqrestore(&info->netlock, flags);
2533
2534         if (port->count == 1) {
2535                 /* 1st open on this device, init hardware */
2536                 retval = startup(info, tty);
2537                 if (retval < 0)
2538                         goto cleanup;
2539         }
2540
2541         retval = tty_port_block_til_ready(&info->port, tty, filp);
2542         if (retval) {
2543                 if (debug_level >= DEBUG_LEVEL_INFO)
2544                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2545                                  __FILE__, __LINE__, info->device_name, retval);
2546                 goto cleanup;
2547         }
2548
2549         if (debug_level >= DEBUG_LEVEL_INFO)
2550                 printk("%s(%d):mgslpc_open(%s) success\n",
2551                          __FILE__, __LINE__, info->device_name);
2552         retval = 0;
2553
2554 cleanup:
2555         return retval;
2556 }
2557
2558 /*
2559  * /proc fs routines....
2560  */
2561
2562 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2563 {
2564         char    stat_buf[30];
2565         unsigned long flags;
2566
2567         seq_printf(m, "%s:io:%04X irq:%d",
2568                       info->device_name, info->io_base, info->irq_level);
2569
2570         /* output current serial signal states */
2571         spin_lock_irqsave(&info->lock, flags);
2572         get_signals(info);
2573         spin_unlock_irqrestore(&info->lock, flags);
2574
2575         stat_buf[0] = 0;
2576         stat_buf[1] = 0;
2577         if (info->serial_signals & SerialSignal_RTS)
2578                 strcat(stat_buf, "|RTS");
2579         if (info->serial_signals & SerialSignal_CTS)
2580                 strcat(stat_buf, "|CTS");
2581         if (info->serial_signals & SerialSignal_DTR)
2582                 strcat(stat_buf, "|DTR");
2583         if (info->serial_signals & SerialSignal_DSR)
2584                 strcat(stat_buf, "|DSR");
2585         if (info->serial_signals & SerialSignal_DCD)
2586                 strcat(stat_buf, "|CD");
2587         if (info->serial_signals & SerialSignal_RI)
2588                 strcat(stat_buf, "|RI");
2589
2590         if (info->params.mode == MGSL_MODE_HDLC) {
2591                 seq_printf(m, " HDLC txok:%d rxok:%d",
2592                               info->icount.txok, info->icount.rxok);
2593                 if (info->icount.txunder)
2594                         seq_printf(m, " txunder:%d", info->icount.txunder);
2595                 if (info->icount.txabort)
2596                         seq_printf(m, " txabort:%d", info->icount.txabort);
2597                 if (info->icount.rxshort)
2598                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
2599                 if (info->icount.rxlong)
2600                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
2601                 if (info->icount.rxover)
2602                         seq_printf(m, " rxover:%d", info->icount.rxover);
2603                 if (info->icount.rxcrc)
2604                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2605         } else {
2606                 seq_printf(m, " ASYNC tx:%d rx:%d",
2607                               info->icount.tx, info->icount.rx);
2608                 if (info->icount.frame)
2609                         seq_printf(m, " fe:%d", info->icount.frame);
2610                 if (info->icount.parity)
2611                         seq_printf(m, " pe:%d", info->icount.parity);
2612                 if (info->icount.brk)
2613                         seq_printf(m, " brk:%d", info->icount.brk);
2614                 if (info->icount.overrun)
2615                         seq_printf(m, " oe:%d", info->icount.overrun);
2616         }
2617
2618         /* Append serial signal status to end */
2619         seq_printf(m, " %s\n", stat_buf+1);
2620
2621         seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2622                        info->tx_active,info->bh_requested,info->bh_running,
2623                        info->pending_bh);
2624 }
2625
2626 /* Called to print information about devices
2627  */
2628 static int mgslpc_proc_show(struct seq_file *m, void *v)
2629 {
2630         MGSLPC_INFO *info;
2631
2632         seq_printf(m, "synclink driver:%s\n", driver_version);
2633
2634         info = mgslpc_device_list;
2635         while (info) {
2636                 line_info(m, info);
2637                 info = info->next_device;
2638         }
2639         return 0;
2640 }
2641
2642 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2643 {
2644         return single_open(file, mgslpc_proc_show, NULL);
2645 }
2646
2647 static const struct file_operations mgslpc_proc_fops = {
2648         .owner          = THIS_MODULE,
2649         .open           = mgslpc_proc_open,
2650         .read           = seq_read,
2651         .llseek         = seq_lseek,
2652         .release        = single_release,
2653 };
2654
2655 static int rx_alloc_buffers(MGSLPC_INFO *info)
2656 {
2657         /* each buffer has header and data */
2658         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2659
2660         /* calculate total allocation size for 8 buffers */
2661         info->rx_buf_total_size = info->rx_buf_size * 8;
2662
2663         /* limit total allocated memory */
2664         if (info->rx_buf_total_size > 0x10000)
2665                 info->rx_buf_total_size = 0x10000;
2666
2667         /* calculate number of buffers */
2668         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2669
2670         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2671         if (info->rx_buf == NULL)
2672                 return -ENOMEM;
2673
2674         /* unused flag buffer to satisfy receive_buf calling interface */
2675         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
2676         if (!info->flag_buf) {
2677                 kfree(info->rx_buf);
2678                 info->rx_buf = NULL;
2679                 return -ENOMEM;
2680         }
2681         
2682         rx_reset_buffers(info);
2683         return 0;
2684 }
2685
2686 static void rx_free_buffers(MGSLPC_INFO *info)
2687 {
2688         kfree(info->rx_buf);
2689         info->rx_buf = NULL;
2690         kfree(info->flag_buf);
2691         info->flag_buf = NULL;
2692 }
2693
2694 static int claim_resources(MGSLPC_INFO *info)
2695 {
2696         if (rx_alloc_buffers(info) < 0) {
2697                 printk("Can't allocate rx buffer %s\n", info->device_name);
2698                 release_resources(info);
2699                 return -ENODEV;
2700         }
2701         return 0;
2702 }
2703
2704 static void release_resources(MGSLPC_INFO *info)
2705 {
2706         if (debug_level >= DEBUG_LEVEL_INFO)
2707                 printk("release_resources(%s)\n", info->device_name);
2708         rx_free_buffers(info);
2709 }
2710
2711 /* Add the specified device instance data structure to the
2712  * global linked list of devices and increment the device count.
2713  *
2714  * Arguments:           info    pointer to device instance data
2715  */
2716 static int mgslpc_add_device(MGSLPC_INFO *info)
2717 {
2718         MGSLPC_INFO *current_dev = NULL;
2719         struct device *tty_dev;
2720         int ret;
2721
2722         info->next_device = NULL;
2723         info->line = mgslpc_device_count;
2724         sprintf(info->device_name,"ttySLP%d",info->line);
2725
2726         if (info->line < MAX_DEVICE_COUNT) {
2727                 if (maxframe[info->line])
2728                         info->max_frame_size = maxframe[info->line];
2729         }
2730
2731         mgslpc_device_count++;
2732
2733         if (!mgslpc_device_list)
2734                 mgslpc_device_list = info;
2735         else {
2736                 current_dev = mgslpc_device_list;
2737                 while (current_dev->next_device)
2738                         current_dev = current_dev->next_device;
2739                 current_dev->next_device = info;
2740         }
2741
2742         if (info->max_frame_size < 4096)
2743                 info->max_frame_size = 4096;
2744         else if (info->max_frame_size > 65535)
2745                 info->max_frame_size = 65535;
2746
2747         printk("SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2748                 info->device_name, info->io_base, info->irq_level);
2749
2750 #if SYNCLINK_GENERIC_HDLC
2751         ret = hdlcdev_init(info);
2752         if (ret != 0)
2753                 goto failed;
2754 #endif
2755
2756         tty_dev = tty_port_register_device(&info->port, serial_driver, info->line,
2757                         &info->p_dev->dev);
2758         if (IS_ERR(tty_dev)) {
2759                 ret = PTR_ERR(tty_dev);
2760 #if SYNCLINK_GENERIC_HDLC
2761                 hdlcdev_exit(info);
2762 #endif
2763                 goto failed;
2764         }
2765
2766         return 0;
2767
2768 failed:
2769         if (current_dev)
2770                 current_dev->next_device = NULL;
2771         else
2772                 mgslpc_device_list = NULL;
2773         mgslpc_device_count--;
2774         return ret;
2775 }
2776
2777 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2778 {
2779         MGSLPC_INFO *info = mgslpc_device_list;
2780         MGSLPC_INFO *last = NULL;
2781
2782         while(info) {
2783                 if (info == remove_info) {
2784                         if (last)
2785                                 last->next_device = info->next_device;
2786                         else
2787                                 mgslpc_device_list = info->next_device;
2788                         tty_unregister_device(serial_driver, info->line);
2789 #if SYNCLINK_GENERIC_HDLC
2790                         hdlcdev_exit(info);
2791 #endif
2792                         release_resources(info);
2793                         tty_port_destroy(&info->port);
2794                         kfree(info);
2795                         mgslpc_device_count--;
2796                         return;
2797                 }
2798                 last = info;
2799                 info = info->next_device;
2800         }
2801 }
2802
2803 static const struct pcmcia_device_id mgslpc_ids[] = {
2804         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2805         PCMCIA_DEVICE_NULL
2806 };
2807 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2808
2809 static struct pcmcia_driver mgslpc_driver = {
2810         .owner          = THIS_MODULE,
2811         .name           = "synclink_cs",
2812         .probe          = mgslpc_probe,
2813         .remove         = mgslpc_detach,
2814         .id_table       = mgslpc_ids,
2815         .suspend        = mgslpc_suspend,
2816         .resume         = mgslpc_resume,
2817 };
2818
2819 static const struct tty_operations mgslpc_ops = {
2820         .open = mgslpc_open,
2821         .close = mgslpc_close,
2822         .write = mgslpc_write,
2823         .put_char = mgslpc_put_char,
2824         .flush_chars = mgslpc_flush_chars,
2825         .write_room = mgslpc_write_room,
2826         .chars_in_buffer = mgslpc_chars_in_buffer,
2827         .flush_buffer = mgslpc_flush_buffer,
2828         .ioctl = mgslpc_ioctl,
2829         .throttle = mgslpc_throttle,
2830         .unthrottle = mgslpc_unthrottle,
2831         .send_xchar = mgslpc_send_xchar,
2832         .break_ctl = mgslpc_break,
2833         .wait_until_sent = mgslpc_wait_until_sent,
2834         .set_termios = mgslpc_set_termios,
2835         .stop = tx_pause,
2836         .start = tx_release,
2837         .hangup = mgslpc_hangup,
2838         .tiocmget = tiocmget,
2839         .tiocmset = tiocmset,
2840         .get_icount = mgslpc_get_icount,
2841         .proc_fops = &mgslpc_proc_fops,
2842 };
2843
2844 static int __init synclink_cs_init(void)
2845 {
2846         int rc;
2847
2848         if (break_on_load) {
2849                 mgslpc_get_text_ptr();
2850                 BREAKPOINT();
2851         }
2852
2853         serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2854                         TTY_DRIVER_REAL_RAW |
2855                         TTY_DRIVER_DYNAMIC_DEV);
2856         if (IS_ERR(serial_driver)) {
2857                 rc = PTR_ERR(serial_driver);
2858                 goto err;
2859         }
2860
2861         /* Initialize the tty_driver structure */
2862         serial_driver->driver_name = "synclink_cs";
2863         serial_driver->name = "ttySLP";
2864         serial_driver->major = ttymajor;
2865         serial_driver->minor_start = 64;
2866         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2867         serial_driver->subtype = SERIAL_TYPE_NORMAL;
2868         serial_driver->init_termios = tty_std_termios;
2869         serial_driver->init_termios.c_cflag =
2870         B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2871         tty_set_operations(serial_driver, &mgslpc_ops);
2872
2873         rc = tty_register_driver(serial_driver);
2874         if (rc < 0) {
2875                 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2876                                 __FILE__, __LINE__);
2877                 goto err_put_tty;
2878         }
2879
2880         rc = pcmcia_register_driver(&mgslpc_driver);
2881         if (rc < 0)
2882                 goto err_unreg_tty;
2883
2884         printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2885                         serial_driver->major);
2886
2887         return 0;
2888 err_unreg_tty:
2889         tty_unregister_driver(serial_driver);
2890 err_put_tty:
2891         put_tty_driver(serial_driver);
2892 err:
2893         return rc;
2894 }
2895
2896 static void __exit synclink_cs_exit(void)
2897 {
2898         pcmcia_unregister_driver(&mgslpc_driver);
2899         tty_unregister_driver(serial_driver);
2900         put_tty_driver(serial_driver);
2901 }
2902
2903 module_init(synclink_cs_init);
2904 module_exit(synclink_cs_exit);
2905
2906 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2907 {
2908         unsigned int M, N;
2909         unsigned char val;
2910
2911         /* note:standard BRG mode is broken in V3.2 chip
2912          * so enhanced mode is always used
2913          */
2914
2915         if (rate) {
2916                 N = 3686400 / rate;
2917                 if (!N)
2918                         N = 1;
2919                 N >>= 1;
2920                 for (M = 1; N > 64 && M < 16; M++)
2921                         N >>= 1;
2922                 N--;
2923
2924                 /* BGR[5..0] = N
2925                  * BGR[9..6] = M
2926                  * BGR[7..0] contained in BGR register
2927                  * BGR[9..8] contained in CCR2[7..6]
2928                  * divisor = (N+1)*2^M
2929                  *
2930                  * Note: M *must* not be zero (causes asymetric duty cycle)
2931                  */
2932                 write_reg(info, (unsigned char) (channel + BGR),
2933                                   (unsigned char) ((M << 6) + N));
2934                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2935                 val |= ((M << 4) & 0xc0);
2936                 write_reg(info, (unsigned char) (channel + CCR2), val);
2937         }
2938 }
2939
2940 /* Enabled the AUX clock output at the specified frequency.
2941  */
2942 static void enable_auxclk(MGSLPC_INFO *info)
2943 {
2944         unsigned char val;
2945
2946         /* MODE
2947          *
2948          * 07..06  MDS[1..0] 10 = transparent HDLC mode
2949          * 05      ADM Address Mode, 0 = no addr recognition
2950          * 04      TMD Timer Mode, 0 = external
2951          * 03      RAC Receiver Active, 0 = inactive
2952          * 02      RTS 0=RTS active during xmit, 1=RTS always active
2953          * 01      TRS Timer Resolution, 1=512
2954          * 00      TLP Test Loop, 0 = no loop
2955          *
2956          * 1000 0010
2957          */
2958         val = 0x82;
2959
2960         /* channel B RTS is used to enable AUXCLK driver on SP505 */
2961         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2962                 val |= BIT2;
2963         write_reg(info, CHB + MODE, val);
2964
2965         /* CCR0
2966          *
2967          * 07      PU Power Up, 1=active, 0=power down
2968          * 06      MCE Master Clock Enable, 1=enabled
2969          * 05      Reserved, 0
2970          * 04..02  SC[2..0] Encoding
2971          * 01..00  SM[1..0] Serial Mode, 00=HDLC
2972          *
2973          * 11000000
2974          */
2975         write_reg(info, CHB + CCR0, 0xc0);
2976
2977         /* CCR1
2978          *
2979          * 07      SFLG Shared Flag, 0 = disable shared flags
2980          * 06      GALP Go Active On Loop, 0 = not used
2981          * 05      GLP Go On Loop, 0 = not used
2982          * 04      ODS Output Driver Select, 1=TxD is push-pull output
2983          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
2984          * 02..00  CM[2..0] Clock Mode
2985          *
2986          * 0001 0111
2987          */
2988         write_reg(info, CHB + CCR1, 0x17);
2989
2990         /* CCR2 (Channel B)
2991          *
2992          * 07..06  BGR[9..8] Baud rate bits 9..8
2993          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
2994          * 04      SSEL Clock source select, 1=submode b
2995          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
2996          * 02      RWX Read/Write Exchange 0=disabled
2997          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
2998          * 00      DIV, data inversion 0=disabled, 1=enabled
2999          *
3000          * 0011 1000
3001          */
3002         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3003                 write_reg(info, CHB + CCR2, 0x38);
3004         else
3005                 write_reg(info, CHB + CCR2, 0x30);
3006
3007         /* CCR4
3008          *
3009          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3010          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3011          * 05      TST1 Test Pin, 0=normal operation
3012          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3013          * 03..02  Reserved, must be 0
3014          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3015          *
3016          * 0101 0000
3017          */
3018         write_reg(info, CHB + CCR4, 0x50);
3019
3020         /* if auxclk not enabled, set internal BRG so
3021          * CTS transitions can be detected (requires TxC)
3022          */
3023         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3024                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3025         else
3026                 mgslpc_set_rate(info, CHB, 921600);
3027 }
3028
3029 static void loopback_enable(MGSLPC_INFO *info)
3030 {
3031         unsigned char val;
3032
3033         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3034         val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3035         write_reg(info, CHA + CCR1, val);
3036
3037         /* CCR2:04 SSEL Clock source select, 1=submode b */
3038         val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3039         write_reg(info, CHA + CCR2, val);
3040
3041         /* set LinkSpeed if available, otherwise default to 2Mbps */
3042         if (info->params.clock_speed)
3043                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3044         else
3045                 mgslpc_set_rate(info, CHA, 1843200);
3046
3047         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3048         val = read_reg(info, CHA + MODE) | BIT0;
3049         write_reg(info, CHA + MODE, val);
3050 }
3051
3052 static void hdlc_mode(MGSLPC_INFO *info)
3053 {
3054         unsigned char val;
3055         unsigned char clkmode, clksubmode;
3056
3057         /* disable all interrupts */
3058         irq_disable(info, CHA, 0xffff);
3059         irq_disable(info, CHB, 0xffff);
3060         port_irq_disable(info, 0xff);
3061
3062         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3063         clkmode = clksubmode = 0;
3064         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3065             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3066                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3067                 clkmode = 7;
3068         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3069                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3070                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3071                 clkmode = 7;
3072                 clksubmode = 1;
3073         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3074                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3075                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3076                         clkmode = 6;
3077                         clksubmode = 1;
3078                 } else {
3079                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3080                         clkmode = 6;
3081                 }
3082         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3083                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3084                 clksubmode = 1;
3085         }
3086
3087         /* MODE
3088          *
3089          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3090          * 05      ADM Address Mode, 0 = no addr recognition
3091          * 04      TMD Timer Mode, 0 = external
3092          * 03      RAC Receiver Active, 0 = inactive
3093          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3094          * 01      TRS Timer Resolution, 1=512
3095          * 00      TLP Test Loop, 0 = no loop
3096          *
3097          * 1000 0010
3098          */
3099         val = 0x82;
3100         if (info->params.loopback)
3101                 val |= BIT0;
3102
3103         /* preserve RTS state */
3104         if (info->serial_signals & SerialSignal_RTS)
3105                 val |= BIT2;
3106         write_reg(info, CHA + MODE, val);
3107
3108         /* CCR0
3109          *
3110          * 07      PU Power Up, 1=active, 0=power down
3111          * 06      MCE Master Clock Enable, 1=enabled
3112          * 05      Reserved, 0
3113          * 04..02  SC[2..0] Encoding
3114          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3115          *
3116          * 11000000
3117          */
3118         val = 0xc0;
3119         switch (info->params.encoding)
3120         {
3121         case HDLC_ENCODING_NRZI:
3122                 val |= BIT3;
3123                 break;
3124         case HDLC_ENCODING_BIPHASE_SPACE:
3125                 val |= BIT4;
3126                 break;          // FM0
3127         case HDLC_ENCODING_BIPHASE_MARK:
3128                 val |= BIT4 + BIT2;
3129                 break;          // FM1
3130         case HDLC_ENCODING_BIPHASE_LEVEL:
3131                 val |= BIT4 + BIT3;
3132                 break;          // Manchester
3133         }
3134         write_reg(info, CHA + CCR0, val);
3135
3136         /* CCR1
3137          *
3138          * 07      SFLG Shared Flag, 0 = disable shared flags
3139          * 06      GALP Go Active On Loop, 0 = not used
3140          * 05      GLP Go On Loop, 0 = not used
3141          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3142          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3143          * 02..00  CM[2..0] Clock Mode
3144          *
3145          * 0001 0000
3146          */
3147         val = 0x10 + clkmode;
3148         write_reg(info, CHA + CCR1, val);
3149
3150         /* CCR2
3151          *
3152          * 07..06  BGR[9..8] Baud rate bits 9..8
3153          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3154          * 04      SSEL Clock source select, 1=submode b
3155          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3156          * 02      RWX Read/Write Exchange 0=disabled
3157          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3158          * 00      DIV, data inversion 0=disabled, 1=enabled
3159          *
3160          * 0000 0000
3161          */
3162         val = 0x00;
3163         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3164             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3165                 val |= BIT5;
3166         if (clksubmode)
3167                 val |= BIT4;
3168         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3169                 val |= BIT1;
3170         if (info->params.encoding == HDLC_ENCODING_NRZB)
3171                 val |= BIT0;
3172         write_reg(info, CHA + CCR2, val);
3173
3174         /* CCR3
3175          *
3176          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3177          * 05      EPT Enable preamble transmission, 1=enabled
3178          * 04      RADD Receive address pushed to FIFO, 0=disabled
3179          * 03      CRL CRC Reset Level, 0=FFFF
3180          * 02      RCRC Rx CRC 0=On 1=Off
3181          * 01      TCRC Tx CRC 0=On 1=Off
3182          * 00      PSD DPLL Phase Shift Disable
3183          *
3184          * 0000 0000
3185          */
3186         val = 0x00;
3187         if (info->params.crc_type == HDLC_CRC_NONE)
3188                 val |= BIT2 + BIT1;
3189         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3190                 val |= BIT5;
3191         switch (info->params.preamble_length)
3192         {
3193         case HDLC_PREAMBLE_LENGTH_16BITS:
3194                 val |= BIT6;
3195                 break;
3196         case HDLC_PREAMBLE_LENGTH_32BITS:
3197                 val |= BIT6;
3198                 break;
3199         case HDLC_PREAMBLE_LENGTH_64BITS:
3200                 val |= BIT7 + BIT6;
3201                 break;
3202         }
3203         write_reg(info, CHA + CCR3, val);
3204
3205         /* PRE - Preamble pattern */
3206         val = 0;
3207         switch (info->params.preamble)
3208         {
3209         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3210         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3211         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3212         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3213         }
3214         write_reg(info, CHA + PRE, val);
3215
3216         /* CCR4
3217          *
3218          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3219          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3220          * 05      TST1 Test Pin, 0=normal operation
3221          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3222          * 03..02  Reserved, must be 0
3223          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3224          *
3225          * 0101 0000
3226          */
3227         val = 0x50;
3228         write_reg(info, CHA + CCR4, val);
3229         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3230                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3231         else
3232                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3233
3234         /* RLCR Receive length check register
3235          *
3236          * 7     1=enable receive length check
3237          * 6..0  Max frame length = (RL + 1) * 32
3238          */
3239         write_reg(info, CHA + RLCR, 0);
3240
3241         /* XBCH Transmit Byte Count High
3242          *
3243          * 07      DMA mode, 0 = interrupt driven
3244          * 06      NRM, 0=ABM (ignored)
3245          * 05      CAS Carrier Auto Start
3246          * 04      XC Transmit Continuously (ignored)
3247          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3248          *
3249          * 0000 0000
3250          */
3251         val = 0x00;
3252         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3253                 val |= BIT5;
3254         write_reg(info, CHA + XBCH, val);
3255         enable_auxclk(info);
3256         if (info->params.loopback || info->testing_irq)
3257                 loopback_enable(info);
3258         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3259         {
3260                 irq_enable(info, CHB, IRQ_CTS);
3261                 /* PVR[3] 1=AUTO CTS active */
3262                 set_reg_bits(info, CHA + PVR, BIT3);
3263         } else
3264                 clear_reg_bits(info, CHA + PVR, BIT3);
3265
3266         irq_enable(info, CHA,
3267                          IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3268                          IRQ_UNDERRUN + IRQ_TXFIFO);
3269         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3270         wait_command_complete(info, CHA);
3271         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3272
3273         /* Master clock mode enabled above to allow reset commands
3274          * to complete even if no data clocks are present.
3275          *
3276          * Disable master clock mode for normal communications because
3277          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3278          * IRQ when in master clock mode.
3279          *
3280          * Leave master clock mode enabled for IRQ test because the
3281          * timer IRQ used by the test can only happen in master clock mode.
3282          */
3283         if (!info->testing_irq)
3284                 clear_reg_bits(info, CHA + CCR0, BIT6);
3285
3286         tx_set_idle(info);
3287
3288         tx_stop(info);