ia64: allocate percpu area for cpu0 like percpu areas for other cpus
[linux-2.6.git] / arch / ia64 / hp / sim / simserial.c
1 /*
2  * Simulated Serial Driver (fake serial)
3  *
4  * This driver is mostly used for bringup purposes and will go away.
5  * It has a strong dependency on the system console. All outputs
6  * are rerouted to the same facility as the one used by printk which, in our
7  * case means sys_sim.c console (goes via the simulator). The code hereafter
8  * is completely leveraged from the serial.c driver.
9  *
10  * Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co
11  *      Stephane Eranian <eranian@hpl.hp.com>
12  *      David Mosberger-Tang <davidm@hpl.hp.com>
13  *
14  * 02/04/00 D. Mosberger        Merged in serial.c bug fixes in rs_close().
15  * 02/25/00 D. Mosberger        Synced up with 2.3.99pre-5 version of serial.c.
16  * 07/30/02 D. Mosberger        Replace sti()/cli() with explicit spinlocks & local irq masking
17  */
18
19 #include <linux/init.h>
20 #include <linux/errno.h>
21 #include <linux/sched.h>
22 #include <linux/tty.h>
23 #include <linux/tty_flip.h>
24 #include <linux/major.h>
25 #include <linux/fcntl.h>
26 #include <linux/mm.h>
27 #include <linux/seq_file.h>
28 #include <linux/slab.h>
29 #include <linux/capability.h>
30 #include <linux/console.h>
31 #include <linux/module.h>
32 #include <linux/serial.h>
33 #include <linux/serialP.h>
34 #include <linux/sysrq.h>
35
36 #include <asm/irq.h>
37 #include <asm/hw_irq.h>
38 #include <asm/uaccess.h>
39
40 #undef SIMSERIAL_DEBUG  /* define this to get some debug information */
41
42 #define KEYBOARD_INTR   3       /* must match with simulator! */
43
44 #define NR_PORTS        1       /* only one port for now */
45
46 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED : IRQF_DISABLED)
47
48 #define SSC_GETCHAR     21
49
50 extern long ia64_ssc (long, long, long, long, int);
51 extern void ia64_ssc_connect_irq (long intr, long irq);
52
53 static char *serial_name = "SimSerial driver";
54 static char *serial_version = "0.6";
55
56 /*
57  * This has been extracted from asm/serial.h. We need one eventually but
58  * I don't know exactly what we're going to put in it so just fake one
59  * for now.
60  */
61 #define BASE_BAUD ( 1843200 / 16 )
62
63 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
64
65 /*
66  * Most of the values here are meaningless to this particular driver.
67  * However some values must be preserved for the code (leveraged from serial.c
68  * to work correctly).
69  * port must not be 0
70  * type must not be UNKNOWN
71  * So I picked arbitrary (guess from where?) values instead
72  */
73 static struct serial_state rs_table[NR_PORTS]={
74   /* UART CLK   PORT IRQ     FLAGS        */
75   { 0, BASE_BAUD, 0x3F8, 0, STD_COM_FLAGS,0,PORT_16550 }  /* ttyS0 */
76 };
77
78 /*
79  * Just for the fun of it !
80  */
81 static struct serial_uart_config uart_config[] = {
82         { "unknown", 1, 0 },
83         { "8250", 1, 0 },
84         { "16450", 1, 0 },
85         { "16550", 1, 0 },
86         { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
87         { "cirrus", 1, 0 },
88         { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
89         { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
90                   UART_STARTECH },
91         { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
92         { NULL, 0}
93 };
94
95 struct tty_driver *hp_simserial_driver;
96
97 static struct async_struct *IRQ_ports[NR_IRQS];
98
99 static struct console *console;
100
101 static unsigned char *tmp_buf;
102
103 extern struct console *console_drivers; /* from kernel/printk.c */
104
105 /*
106  * ------------------------------------------------------------
107  * rs_stop() and rs_start()
108  *
109  * This routines are called before setting or resetting tty->stopped.
110  * They enable or disable transmitter interrupts, as necessary.
111  * ------------------------------------------------------------
112  */
113 static void rs_stop(struct tty_struct *tty)
114 {
115 #ifdef SIMSERIAL_DEBUG
116         printk("rs_stop: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
117                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
118 #endif
119
120 }
121
122 static void rs_start(struct tty_struct *tty)
123 {
124 #ifdef SIMSERIAL_DEBUG
125         printk("rs_start: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
126                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
127 #endif
128 }
129
130 static  void receive_chars(struct tty_struct *tty)
131 {
132         unsigned char ch;
133         static unsigned char seen_esc = 0;
134
135         while ( (ch = ia64_ssc(0, 0, 0, 0, SSC_GETCHAR)) ) {
136                 if ( ch == 27 && seen_esc == 0 ) {
137                         seen_esc = 1;
138                         continue;
139                 } else {
140                         if ( seen_esc==1 && ch == 'O' ) {
141                                 seen_esc = 2;
142                                 continue;
143                         } else if ( seen_esc == 2 ) {
144                                 if ( ch == 'P' ) /* F1 */
145                                         show_state();
146 #ifdef CONFIG_MAGIC_SYSRQ
147                                 if ( ch == 'S' ) { /* F4 */
148                                         do
149                                                 ch = ia64_ssc(0, 0, 0, 0,
150                                                               SSC_GETCHAR);
151                                         while (!ch);
152                                         handle_sysrq(ch, NULL);
153                                 }
154 #endif
155                                 seen_esc = 0;
156                                 continue;
157                         }
158                 }
159                 seen_esc = 0;
160
161                 if (tty_insert_flip_char(tty, ch, TTY_NORMAL) == 0)
162                         break;
163         }
164         tty_flip_buffer_push(tty);
165 }
166
167 /*
168  * This is the serial driver's interrupt routine for a single port
169  */
170 static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
171 {
172         struct async_struct * info;
173
174         /*
175          * I don't know exactly why they don't use the dev_id opaque data
176          * pointer instead of this extra lookup table
177          */
178         info = IRQ_ports[irq];
179         if (!info || !info->tty) {
180                 printk(KERN_INFO "simrs_interrupt_single: info|tty=0 info=%p problem\n", info);
181                 return IRQ_NONE;
182         }
183         /*
184          * pretty simple in our case, because we only get interrupts
185          * on inbound traffic
186          */
187         receive_chars(info->tty);
188         return IRQ_HANDLED;
189 }
190
191 /*
192  * -------------------------------------------------------------------
193  * Here ends the serial interrupt routines.
194  * -------------------------------------------------------------------
195  */
196
197 static void do_softint(struct work_struct *private_)
198 {
199         printk(KERN_ERR "simserial: do_softint called\n");
200 }
201
202 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
203 {
204         struct async_struct *info = (struct async_struct *)tty->driver_data;
205         unsigned long flags;
206
207         if (!tty || !info->xmit.buf)
208                 return 0;
209
210         local_irq_save(flags);
211         if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) {
212                 local_irq_restore(flags);
213                 return 0;
214         }
215         info->xmit.buf[info->xmit.head] = ch;
216         info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1);
217         local_irq_restore(flags);
218         return 1;
219 }
220
221 static void transmit_chars(struct async_struct *info, int *intr_done)
222 {
223         int count;
224         unsigned long flags;
225
226
227         local_irq_save(flags);
228
229         if (info->x_char) {
230                 char c = info->x_char;
231
232                 console->write(console, &c, 1);
233
234                 info->state->icount.tx++;
235                 info->x_char = 0;
236
237                 goto out;
238         }
239
240         if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) {
241 #ifdef SIMSERIAL_DEBUG
242                 printk("transmit_chars: head=%d, tail=%d, stopped=%d\n",
243                        info->xmit.head, info->xmit.tail, info->tty->stopped);
244 #endif
245                 goto out;
246         }
247         /*
248          * We removed the loop and try to do it in to chunks. We need
249          * 2 operations maximum because it's a ring buffer.
250          *
251          * First from current to tail if possible.
252          * Then from the beginning of the buffer until necessary
253          */
254
255         count = min(CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE),
256                     SERIAL_XMIT_SIZE - info->xmit.tail);
257         console->write(console, info->xmit.buf+info->xmit.tail, count);
258
259         info->xmit.tail = (info->xmit.tail+count) & (SERIAL_XMIT_SIZE-1);
260
261         /*
262          * We have more at the beginning of the buffer
263          */
264         count = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
265         if (count) {
266                 console->write(console, info->xmit.buf, count);
267                 info->xmit.tail += count;
268         }
269 out:
270         local_irq_restore(flags);
271 }
272
273 static void rs_flush_chars(struct tty_struct *tty)
274 {
275         struct async_struct *info = (struct async_struct *)tty->driver_data;
276
277         if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped ||
278             !info->xmit.buf)
279                 return;
280
281         transmit_chars(info, NULL);
282 }
283
284
285 static int rs_write(struct tty_struct * tty,
286                     const unsigned char *buf, int count)
287 {
288         int     c, ret = 0;
289         struct async_struct *info = (struct async_struct *)tty->driver_data;
290         unsigned long flags;
291
292         if (!tty || !info->xmit.buf || !tmp_buf) return 0;
293
294         local_irq_save(flags);
295         while (1) {
296                 c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
297                 if (count < c)
298                         c = count;
299                 if (c <= 0) {
300                         break;
301                 }
302                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
303                 info->xmit.head = ((info->xmit.head + c) &
304                                    (SERIAL_XMIT_SIZE-1));
305                 buf += c;
306                 count -= c;
307                 ret += c;
308         }
309         local_irq_restore(flags);
310         /*
311          * Hey, we transmit directly from here in our case
312          */
313         if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE)
314             && !tty->stopped && !tty->hw_stopped) {
315                 transmit_chars(info, NULL);
316         }
317         return ret;
318 }
319
320 static int rs_write_room(struct tty_struct *tty)
321 {
322         struct async_struct *info = (struct async_struct *)tty->driver_data;
323
324         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
325 }
326
327 static int rs_chars_in_buffer(struct tty_struct *tty)
328 {
329         struct async_struct *info = (struct async_struct *)tty->driver_data;
330
331         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
332 }
333
334 static void rs_flush_buffer(struct tty_struct *tty)
335 {
336         struct async_struct *info = (struct async_struct *)tty->driver_data;
337         unsigned long flags;
338
339         local_irq_save(flags);
340         info->xmit.head = info->xmit.tail = 0;
341         local_irq_restore(flags);
342
343         tty_wakeup(tty);
344 }
345
346 /*
347  * This function is used to send a high-priority XON/XOFF character to
348  * the device
349  */
350 static void rs_send_xchar(struct tty_struct *tty, char ch)
351 {
352         struct async_struct *info = (struct async_struct *)tty->driver_data;
353
354         info->x_char = ch;
355         if (ch) {
356                 /*
357                  * I guess we could call console->write() directly but
358                  * let's do that for now.
359                  */
360                 transmit_chars(info, NULL);
361         }
362 }
363
364 /*
365  * ------------------------------------------------------------
366  * rs_throttle()
367  *
368  * This routine is called by the upper-layer tty layer to signal that
369  * incoming characters should be throttled.
370  * ------------------------------------------------------------
371  */
372 static void rs_throttle(struct tty_struct * tty)
373 {
374         if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty));
375
376         printk(KERN_INFO "simrs_throttle called\n");
377 }
378
379 static void rs_unthrottle(struct tty_struct * tty)
380 {
381         struct async_struct *info = (struct async_struct *)tty->driver_data;
382
383         if (I_IXOFF(tty)) {
384                 if (info->x_char)
385                         info->x_char = 0;
386                 else
387                         rs_send_xchar(tty, START_CHAR(tty));
388         }
389         printk(KERN_INFO "simrs_unthrottle called\n");
390 }
391
392
393 static int rs_ioctl(struct tty_struct *tty, struct file * file,
394                     unsigned int cmd, unsigned long arg)
395 {
396         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
397             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
398             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
399                 if (tty->flags & (1 << TTY_IO_ERROR))
400                     return -EIO;
401         }
402
403         switch (cmd) {
404                 case TIOCGSERIAL:
405                         printk(KERN_INFO "simrs_ioctl TIOCGSERIAL called\n");
406                         return 0;
407                 case TIOCSSERIAL:
408                         printk(KERN_INFO "simrs_ioctl TIOCSSERIAL called\n");
409                         return 0;
410                 case TIOCSERCONFIG:
411                         printk(KERN_INFO "rs_ioctl: TIOCSERCONFIG called\n");
412                         return -EINVAL;
413
414                 case TIOCSERGETLSR: /* Get line status register */
415                         printk(KERN_INFO "rs_ioctl: TIOCSERGETLSR called\n");
416                         return  -EINVAL;
417
418                 case TIOCSERGSTRUCT:
419                         printk(KERN_INFO "rs_ioctl: TIOCSERGSTRUCT called\n");
420 #if 0
421                         if (copy_to_user((struct async_struct *) arg,
422                                          info, sizeof(struct async_struct)))
423                                 return -EFAULT;
424 #endif
425                         return 0;
426
427                 /*
428                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
429                  * - mask passed in arg for lines of interest
430                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
431                  * Caller should use TIOCGICOUNT to see which one it was
432                  */
433                 case TIOCMIWAIT:
434                         printk(KERN_INFO "rs_ioctl: TIOCMIWAIT: called\n");
435                         return 0;
436                 /*
437                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
438                  * Return: write counters to the user passed counter struct
439                  * NB: both 1->0 and 0->1 transitions are counted except for
440                  *     RI where only 0->1 is counted.
441                  */
442                 case TIOCGICOUNT:
443                         printk(KERN_INFO "rs_ioctl: TIOCGICOUNT called\n");
444                         return 0;
445
446                 case TIOCSERGWILD:
447                 case TIOCSERSWILD:
448                         /* "setserial -W" is called in Debian boot */
449                         printk (KERN_INFO "TIOCSER?WILD ioctl obsolete, ignored.\n");
450                         return 0;
451
452                 default:
453                         return -ENOIOCTLCMD;
454                 }
455         return 0;
456 }
457
458 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
459
460 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
461 {
462         /* Handle turning off CRTSCTS */
463         if ((old_termios->c_cflag & CRTSCTS) &&
464             !(tty->termios->c_cflag & CRTSCTS)) {
465                 tty->hw_stopped = 0;
466                 rs_start(tty);
467         }
468 }
469 /*
470  * This routine will shutdown a serial port; interrupts are disabled, and
471  * DTR is dropped if the hangup on close termio flag is on.
472  */
473 static void shutdown(struct async_struct * info)
474 {
475         unsigned long   flags;
476         struct serial_state *state;
477         int             retval;
478
479         if (!(info->flags & ASYNC_INITIALIZED)) return;
480
481         state = info->state;
482
483 #ifdef SIMSERIAL_DEBUG
484         printk("Shutting down serial port %d (irq %d)....", info->line,
485                state->irq);
486 #endif
487
488         local_irq_save(flags);
489         {
490                 /*
491                  * First unlink the serial port from the IRQ chain...
492                  */
493                 if (info->next_port)
494                         info->next_port->prev_port = info->prev_port;
495                 if (info->prev_port)
496                         info->prev_port->next_port = info->next_port;
497                 else
498                         IRQ_ports[state->irq] = info->next_port;
499
500                 /*
501                  * Free the IRQ, if necessary
502                  */
503                 if (state->irq && (!IRQ_ports[state->irq] ||
504                                    !IRQ_ports[state->irq]->next_port)) {
505                         if (IRQ_ports[state->irq]) {
506                                 free_irq(state->irq, NULL);
507                                 retval = request_irq(state->irq, rs_interrupt_single,
508                                                      IRQ_T(info), "serial", NULL);
509
510                                 if (retval)
511                                         printk(KERN_ERR "serial shutdown: request_irq: error %d"
512                                                "  Couldn't reacquire IRQ.\n", retval);
513                         } else
514                                 free_irq(state->irq, NULL);
515                 }
516
517                 if (info->xmit.buf) {
518                         free_page((unsigned long) info->xmit.buf);
519                         info->xmit.buf = NULL;
520                 }
521
522                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
523
524                 info->flags &= ~ASYNC_INITIALIZED;
525         }
526         local_irq_restore(flags);
527 }
528
529 /*
530  * ------------------------------------------------------------
531  * rs_close()
532  *
533  * This routine is called when the serial port gets closed.  First, we
534  * wait for the last remaining data to be sent.  Then, we unlink its
535  * async structure from the interrupt chain if necessary, and we free
536  * that IRQ if nothing is left in the chain.
537  * ------------------------------------------------------------
538  */
539 static void rs_close(struct tty_struct *tty, struct file * filp)
540 {
541         struct async_struct * info = (struct async_struct *)tty->driver_data;
542         struct serial_state *state;
543         unsigned long flags;
544
545         if (!info ) return;
546
547         state = info->state;
548
549         local_irq_save(flags);
550         if (tty_hung_up_p(filp)) {
551 #ifdef SIMSERIAL_DEBUG
552                 printk("rs_close: hung_up\n");
553 #endif
554                 local_irq_restore(flags);
555                 return;
556         }
557 #ifdef SIMSERIAL_DEBUG
558         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
559 #endif
560         if ((tty->count == 1) && (state->count != 1)) {
561                 /*
562                  * Uh, oh.  tty->count is 1, which means that the tty
563                  * structure will be freed.  state->count should always
564                  * be one in these conditions.  If it's greater than
565                  * one, we've got real problems, since it means the
566                  * serial port won't be shutdown.
567                  */
568                 printk(KERN_ERR "rs_close: bad serial port count; tty->count is 1, "
569                        "state->count is %d\n", state->count);
570                 state->count = 1;
571         }
572         if (--state->count < 0) {
573                 printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
574                        info->line, state->count);
575                 state->count = 0;
576         }
577         if (state->count) {
578                 local_irq_restore(flags);
579                 return;
580         }
581         info->flags |= ASYNC_CLOSING;
582         local_irq_restore(flags);
583
584         /*
585          * Now we wait for the transmit buffer to clear; and we notify
586          * the line discipline to only process XON/XOFF characters.
587          */
588         shutdown(info);
589         rs_flush_buffer(tty);
590         tty_ldisc_flush(tty);
591         info->event = 0;
592         info->tty = NULL;
593         if (info->blocked_open) {
594                 if (info->close_delay)
595                         schedule_timeout_interruptible(info->close_delay);
596                 wake_up_interruptible(&info->open_wait);
597         }
598         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
599         wake_up_interruptible(&info->close_wait);
600 }
601
602 /*
603  * rs_wait_until_sent() --- wait until the transmitter is empty
604  */
605 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
606 {
607 }
608
609
610 /*
611  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
612  */
613 static void rs_hangup(struct tty_struct *tty)
614 {
615         struct async_struct * info = (struct async_struct *)tty->driver_data;
616         struct serial_state *state = info->state;
617
618 #ifdef SIMSERIAL_DEBUG
619         printk("rs_hangup: called\n");
620 #endif
621
622         state = info->state;
623
624         rs_flush_buffer(tty);
625         if (info->flags & ASYNC_CLOSING)
626                 return;
627         shutdown(info);
628
629         info->event = 0;
630         state->count = 0;
631         info->flags &= ~ASYNC_NORMAL_ACTIVE;
632         info->tty = NULL;
633         wake_up_interruptible(&info->open_wait);
634 }
635
636
637 static int get_async_struct(int line, struct async_struct **ret_info)
638 {
639         struct async_struct *info;
640         struct serial_state *sstate;
641
642         sstate = rs_table + line;
643         sstate->count++;
644         if (sstate->info) {
645                 *ret_info = sstate->info;
646                 return 0;
647         }
648         info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
649         if (!info) {
650                 sstate->count--;
651                 return -ENOMEM;
652         }
653         init_waitqueue_head(&info->open_wait);
654         init_waitqueue_head(&info->close_wait);
655         init_waitqueue_head(&info->delta_msr_wait);
656         info->magic = SERIAL_MAGIC;
657         info->port = sstate->port;
658         info->flags = sstate->flags;
659         info->xmit_fifo_size = sstate->xmit_fifo_size;
660         info->line = line;
661         INIT_WORK(&info->work, do_softint);
662         info->state = sstate;
663         if (sstate->info) {
664                 kfree(info);
665                 *ret_info = sstate->info;
666                 return 0;
667         }
668         *ret_info = sstate->info = info;
669         return 0;
670 }
671
672 static int
673 startup(struct async_struct *info)
674 {
675         unsigned long flags;
676         int     retval=0;
677         irq_handler_t handler;
678         struct serial_state *state= info->state;
679         unsigned long page;
680
681         page = get_zeroed_page(GFP_KERNEL);
682         if (!page)
683                 return -ENOMEM;
684
685         local_irq_save(flags);
686
687         if (info->flags & ASYNC_INITIALIZED) {
688                 free_page(page);
689                 goto errout;
690         }
691
692         if (!state->port || !state->type) {
693                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
694                 free_page(page);
695                 goto errout;
696         }
697         if (info->xmit.buf)
698                 free_page(page);
699         else
700                 info->xmit.buf = (unsigned char *) page;
701
702 #ifdef SIMSERIAL_DEBUG
703         printk("startup: ttys%d (irq %d)...", info->line, state->irq);
704 #endif
705
706         /*
707          * Allocate the IRQ if necessary
708          */
709         if (state->irq && (!IRQ_ports[state->irq] ||
710                           !IRQ_ports[state->irq]->next_port)) {
711                 if (IRQ_ports[state->irq]) {
712                         retval = -EBUSY;
713                         goto errout;
714                 } else
715                         handler = rs_interrupt_single;
716
717                 retval = request_irq(state->irq, handler, IRQ_T(info), "simserial", NULL);
718                 if (retval) {
719                         if (capable(CAP_SYS_ADMIN)) {
720                                 if (info->tty)
721                                         set_bit(TTY_IO_ERROR,
722                                                 &info->tty->flags);
723                                 retval = 0;
724                         }
725                         goto errout;
726                 }
727         }
728
729         /*
730          * Insert serial port into IRQ chain.
731          */
732         info->prev_port = NULL;
733         info->next_port = IRQ_ports[state->irq];
734         if (info->next_port)
735                 info->next_port->prev_port = info;
736         IRQ_ports[state->irq] = info;
737
738         if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags);
739
740         info->xmit.head = info->xmit.tail = 0;
741
742 #if 0
743         /*
744          * Set up serial timers...
745          */
746         timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
747         timer_active |= 1 << RS_TIMER;
748 #endif
749
750         /*
751          * Set up the tty->alt_speed kludge
752          */
753         if (info->tty) {
754                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
755                         info->tty->alt_speed = 57600;
756                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
757                         info->tty->alt_speed = 115200;
758                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
759                         info->tty->alt_speed = 230400;
760                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
761                         info->tty->alt_speed = 460800;
762         }
763
764         info->flags |= ASYNC_INITIALIZED;
765         local_irq_restore(flags);
766         return 0;
767
768 errout:
769         local_irq_restore(flags);
770         return retval;
771 }
772
773
774 /*
775  * This routine is called whenever a serial port is opened.  It
776  * enables interrupts for a serial port, linking in its async structure into
777  * the IRQ chain.   It also performs the serial-specific
778  * initialization for the tty structure.
779  */
780 static int rs_open(struct tty_struct *tty, struct file * filp)
781 {
782         struct async_struct     *info;
783         int                     retval, line;
784         unsigned long           page;
785
786         line = tty->index;
787         if ((line < 0) || (line >= NR_PORTS))
788                 return -ENODEV;
789         retval = get_async_struct(line, &info);
790         if (retval)
791                 return retval;
792         tty->driver_data = info;
793         info->tty = tty;
794
795 #ifdef SIMSERIAL_DEBUG
796         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
797 #endif
798         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
799
800         if (!tmp_buf) {
801                 page = get_zeroed_page(GFP_KERNEL);
802                 if (!page)
803                         return -ENOMEM;
804                 if (tmp_buf)
805                         free_page(page);
806                 else
807                         tmp_buf = (unsigned char *) page;
808         }
809
810         /*
811          * If the port is the middle of closing, bail out now
812          */
813         if (tty_hung_up_p(filp) ||
814             (info->flags & ASYNC_CLOSING)) {
815                 if (info->flags & ASYNC_CLOSING)
816                         interruptible_sleep_on(&info->close_wait);
817 #ifdef SERIAL_DO_RESTART
818                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
819                         -EAGAIN : -ERESTARTSYS);
820 #else
821                 return -EAGAIN;
822 #endif
823         }
824
825         /*
826          * Start up serial port
827          */
828         retval = startup(info);
829         if (retval) {
830                 return retval;
831         }
832
833         /*
834          * figure out which console to use (should be one already)
835          */
836         console = console_drivers;
837         while (console) {
838                 if ((console->flags & CON_ENABLED) && console->write) break;
839                 console = console->next;
840         }
841
842 #ifdef SIMSERIAL_DEBUG
843         printk("rs_open ttys%d successful\n", info->line);
844 #endif
845         return 0;
846 }
847
848 /*
849  * /proc fs routines....
850  */
851
852 static inline void line_info(struct seq_file *m, struct serial_state *state)
853 {
854         seq_printf(m, "%d: uart:%s port:%lX irq:%d\n",
855                        state->line, uart_config[state->type].name,
856                        state->port, state->irq);
857 }
858
859 static int rs_proc_show(struct seq_file *m, void *v)
860 {
861         int i;
862
863         seq_printf(m, "simserinfo:1.0 driver:%s\n", serial_version);
864         for (i = 0; i < NR_PORTS; i++)
865                 line_info(m, &rs_table[i]);
866         return 0;
867 }
868
869 static int rs_proc_open(struct inode *inode, struct file *file)
870 {
871         return single_open(file, rs_proc_show, NULL);
872 }
873
874 static const struct file_operations rs_proc_fops = {
875         .owner          = THIS_MODULE,
876         .open           = rs_proc_open,
877         .read           = seq_read,
878         .llseek         = seq_lseek,
879         .release        = single_release,
880 };
881
882 /*
883  * ---------------------------------------------------------------------
884  * rs_init() and friends
885  *
886  * rs_init() is called at boot-time to initialize the serial driver.
887  * ---------------------------------------------------------------------
888  */
889
890 /*
891  * This routine prints out the appropriate serial driver version
892  * number, and identifies which options were configured into this
893  * driver.
894  */
895 static inline void show_serial_version(void)
896 {
897         printk(KERN_INFO "%s version %s with", serial_name, serial_version);
898         printk(KERN_INFO " no serial options enabled\n");
899 }
900
901 static const struct tty_operations hp_ops = {
902         .open = rs_open,
903         .close = rs_close,
904         .write = rs_write,
905         .put_char = rs_put_char,
906         .flush_chars = rs_flush_chars,
907         .write_room = rs_write_room,
908         .chars_in_buffer = rs_chars_in_buffer,
909         .flush_buffer = rs_flush_buffer,
910         .ioctl = rs_ioctl,
911         .throttle = rs_throttle,
912         .unthrottle = rs_unthrottle,
913         .send_xchar = rs_send_xchar,
914         .set_termios = rs_set_termios,
915         .stop = rs_stop,
916         .start = rs_start,
917         .hangup = rs_hangup,
918         .wait_until_sent = rs_wait_until_sent,
919         .proc_fops = &rs_proc_fops,
920 };
921
922 /*
923  * The serial driver boot-time initialization code!
924  */
925 static int __init
926 simrs_init (void)
927 {
928         int                     i, rc;
929         struct serial_state     *state;
930
931         if (!ia64_platform_is("hpsim"))
932                 return -ENODEV;
933
934         hp_simserial_driver = alloc_tty_driver(1);
935         if (!hp_simserial_driver)
936                 return -ENOMEM;
937
938         show_serial_version();
939
940         /* Initialize the tty_driver structure */
941
942         hp_simserial_driver->owner = THIS_MODULE;
943         hp_simserial_driver->driver_name = "simserial";
944         hp_simserial_driver->name = "ttyS";
945         hp_simserial_driver->major = TTY_MAJOR;
946         hp_simserial_driver->minor_start = 64;
947         hp_simserial_driver->type = TTY_DRIVER_TYPE_SERIAL;
948         hp_simserial_driver->subtype = SERIAL_TYPE_NORMAL;
949         hp_simserial_driver->init_termios = tty_std_termios;
950         hp_simserial_driver->init_termios.c_cflag =
951                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
952         hp_simserial_driver->flags = TTY_DRIVER_REAL_RAW;
953         tty_set_operations(hp_simserial_driver, &hp_ops);
954
955         /*
956          * Let's have a little bit of fun !
957          */
958         for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
959
960                 if (state->type == PORT_UNKNOWN) continue;
961
962                 if (!state->irq) {
963                         if ((rc = assign_irq_vector(AUTO_ASSIGN)) < 0)
964                                 panic("%s: out of interrupt vectors!\n",
965                                       __func__);
966                         state->irq = rc;
967                         ia64_ssc_connect_irq(KEYBOARD_INTR, state->irq);
968                 }
969
970                 printk(KERN_INFO "ttyS%d at 0x%04lx (irq = %d) is a %s\n",
971                        state->line,
972                        state->port, state->irq,
973                        uart_config[state->type].name);
974         }
975
976         if (tty_register_driver(hp_simserial_driver))
977                 panic("Couldn't register simserial driver\n");
978
979         return 0;
980 }
981
982 #ifndef MODULE
983 __initcall(simrs_init);
984 #endif