[PATCH] bogus #if (simserial)
[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/config.h>
20 #include <linux/init.h>
21 #include <linux/errno.h>
22 #include <linux/sched.h>
23 #include <linux/tty.h>
24 #include <linux/tty_flip.h>
25 #include <linux/major.h>
26 #include <linux/fcntl.h>
27 #include <linux/mm.h>
28 #include <linux/slab.h>
29 #include <linux/console.h>
30 #include <linux/module.h>
31 #include <linux/serial.h>
32 #include <linux/serialP.h>
33 #include <linux/sysrq.h>
34
35 #include <asm/irq.h>
36 #include <asm/hw_irq.h>
37 #include <asm/uaccess.h>
38
39 #ifdef CONFIG_KDB
40 # include <linux/kdb.h>
41 #endif
42
43 #undef SIMSERIAL_DEBUG  /* define this to get some debug information */
44
45 #define KEYBOARD_INTR   3       /* must match with simulator! */
46
47 #define NR_PORTS        1       /* only one port for now */
48 #define SERIAL_INLINE   1
49
50 #ifdef SERIAL_INLINE
51 #define _INLINE_ inline
52 #endif
53
54 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
55
56 #define SSC_GETCHAR     21
57
58 extern long ia64_ssc (long, long, long, long, int);
59 extern void ia64_ssc_connect_irq (long intr, long irq);
60
61 static char *serial_name = "SimSerial driver";
62 static char *serial_version = "0.6";
63
64 /*
65  * This has been extracted from asm/serial.h. We need one eventually but
66  * I don't know exactly what we're going to put in it so just fake one
67  * for now.
68  */
69 #define BASE_BAUD ( 1843200 / 16 )
70
71 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
72
73 /*
74  * Most of the values here are meaningless to this particular driver.
75  * However some values must be preserved for the code (leveraged from serial.c
76  * to work correctly).
77  * port must not be 0
78  * type must not be UNKNOWN
79  * So I picked arbitrary (guess from where?) values instead
80  */
81 static struct serial_state rs_table[NR_PORTS]={
82   /* UART CLK   PORT IRQ     FLAGS        */
83   { 0, BASE_BAUD, 0x3F8, 0, STD_COM_FLAGS,0,PORT_16550 }  /* ttyS0 */
84 };
85
86 /*
87  * Just for the fun of it !
88  */
89 static struct serial_uart_config uart_config[] = {
90         { "unknown", 1, 0 },
91         { "8250", 1, 0 },
92         { "16450", 1, 0 },
93         { "16550", 1, 0 },
94         { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
95         { "cirrus", 1, 0 },
96         { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
97         { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
98                   UART_STARTECH },
99         { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
100         { 0, 0}
101 };
102
103 struct tty_driver *hp_simserial_driver;
104
105 static struct async_struct *IRQ_ports[NR_IRQS];
106
107 static struct console *console;
108
109 static unsigned char *tmp_buf;
110 static DECLARE_MUTEX(tmp_buf_sem);
111
112 extern struct console *console_drivers; /* from kernel/printk.c */
113
114 /*
115  * ------------------------------------------------------------
116  * rs_stop() and rs_start()
117  *
118  * This routines are called before setting or resetting tty->stopped.
119  * They enable or disable transmitter interrupts, as necessary.
120  * ------------------------------------------------------------
121  */
122 static void rs_stop(struct tty_struct *tty)
123 {
124 #ifdef SIMSERIAL_DEBUG
125         printk("rs_stop: 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
131 static void rs_start(struct tty_struct *tty)
132 {
133 #ifdef SIMSERIAL_DEBUG
134         printk("rs_start: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
135                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
136 #endif
137 }
138
139 static  void receive_chars(struct tty_struct *tty, struct pt_regs *regs)
140 {
141         unsigned char ch;
142         static unsigned char seen_esc = 0;
143
144         while ( (ch = ia64_ssc(0, 0, 0, 0, SSC_GETCHAR)) ) {
145                 if ( ch == 27 && seen_esc == 0 ) {
146                         seen_esc = 1;
147                         continue;
148                 } else {
149                         if ( seen_esc==1 && ch == 'O' ) {
150                                 seen_esc = 2;
151                                 continue;
152                         } else if ( seen_esc == 2 ) {
153                                 if ( ch == 'P' ) /* F1 */
154                                         show_state();
155 #ifdef CONFIG_MAGIC_SYSRQ
156                                 if ( ch == 'S' ) { /* F4 */
157                                         do
158                                                 ch = ia64_ssc(0, 0, 0, 0,
159                                                               SSC_GETCHAR);
160                                         while (!ch);
161                                         handle_sysrq(ch, regs, NULL);
162                                 }
163 #endif
164                                 seen_esc = 0;
165                                 continue;
166                         }
167                 }
168                 seen_esc = 0;
169                 if (tty->flip.count >= TTY_FLIPBUF_SIZE) break;
170
171                 *tty->flip.char_buf_ptr = ch;
172
173                 *tty->flip.flag_buf_ptr = 0;
174
175                 tty->flip.flag_buf_ptr++;
176                 tty->flip.char_buf_ptr++;
177                 tty->flip.count++;
178         }
179         tty_flip_buffer_push(tty);
180 }
181
182 /*
183  * This is the serial driver's interrupt routine for a single port
184  */
185 static irqreturn_t rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
186 {
187         struct async_struct * info;
188
189         /*
190          * I don't know exactly why they don't use the dev_id opaque data
191          * pointer instead of this extra lookup table
192          */
193         info = IRQ_ports[irq];
194         if (!info || !info->tty) {
195                 printk(KERN_INFO "simrs_interrupt_single: info|tty=0 info=%p problem\n", info);
196                 return IRQ_NONE;
197         }
198         /*
199          * pretty simple in our case, because we only get interrupts
200          * on inbound traffic
201          */
202         receive_chars(info->tty, regs);
203         return IRQ_HANDLED;
204 }
205
206 /*
207  * -------------------------------------------------------------------
208  * Here ends the serial interrupt routines.
209  * -------------------------------------------------------------------
210  */
211
212 #if 0
213 /*
214  * not really used in our situation so keep them commented out for now
215  */
216 static DECLARE_TASK_QUEUE(tq_serial); /* used to be at the top of the file */
217 static void do_serial_bh(void)
218 {
219         run_task_queue(&tq_serial);
220         printk(KERN_ERR "do_serial_bh: called\n");
221 }
222 #endif
223
224 static void do_softint(void *private_)
225 {
226         printk(KERN_ERR "simserial: do_softint called\n");
227 }
228
229 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
230 {
231         struct async_struct *info = (struct async_struct *)tty->driver_data;
232         unsigned long flags;
233
234         if (!tty || !info->xmit.buf) return;
235
236         local_irq_save(flags);
237         if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) {
238                 local_irq_restore(flags);
239                 return;
240         }
241         info->xmit.buf[info->xmit.head] = ch;
242         info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1);
243         local_irq_restore(flags);
244 }
245
246 static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
247 {
248         int count;
249         unsigned long flags;
250
251
252         local_irq_save(flags);
253
254         if (info->x_char) {
255                 char c = info->x_char;
256
257                 console->write(console, &c, 1);
258
259                 info->state->icount.tx++;
260                 info->x_char = 0;
261
262                 goto out;
263         }
264
265         if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) {
266 #ifdef SIMSERIAL_DEBUG
267                 printk("transmit_chars: head=%d, tail=%d, stopped=%d\n",
268                        info->xmit.head, info->xmit.tail, info->tty->stopped);
269 #endif
270                 goto out;
271         }
272         /*
273          * We removed the loop and try to do it in to chunks. We need
274          * 2 operations maximum because it's a ring buffer.
275          *
276          * First from current to tail if possible.
277          * Then from the beginning of the buffer until necessary
278          */
279
280         count = min(CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE),
281                     SERIAL_XMIT_SIZE - info->xmit.tail);
282         console->write(console, info->xmit.buf+info->xmit.tail, count);
283
284         info->xmit.tail = (info->xmit.tail+count) & (SERIAL_XMIT_SIZE-1);
285
286         /*
287          * We have more at the beginning of the buffer
288          */
289         count = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
290         if (count) {
291                 console->write(console, info->xmit.buf, count);
292                 info->xmit.tail += count;
293         }
294 out:
295         local_irq_restore(flags);
296 }
297
298 static void rs_flush_chars(struct tty_struct *tty)
299 {
300         struct async_struct *info = (struct async_struct *)tty->driver_data;
301
302         if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped ||
303             !info->xmit.buf)
304                 return;
305
306         transmit_chars(info, NULL);
307 }
308
309
310 static int rs_write(struct tty_struct * tty,
311                     const unsigned char *buf, int count)
312 {
313         int     c, ret = 0;
314         struct async_struct *info = (struct async_struct *)tty->driver_data;
315         unsigned long flags;
316
317         if (!tty || !info->xmit.buf || !tmp_buf) return 0;
318
319         local_irq_save(flags);
320         while (1) {
321                 c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
322                 if (count < c)
323                         c = count;
324                 if (c <= 0) {
325                         break;
326                 }
327                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
328                 info->xmit.head = ((info->xmit.head + c) &
329                                    (SERIAL_XMIT_SIZE-1));
330                 buf += c;
331                 count -= c;
332                 ret += c;
333         }
334         local_irq_restore(flags);
335         /*
336          * Hey, we transmit directly from here in our case
337          */
338         if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE)
339             && !tty->stopped && !tty->hw_stopped) {
340                 transmit_chars(info, NULL);
341         }
342         return ret;
343 }
344
345 static int rs_write_room(struct tty_struct *tty)
346 {
347         struct async_struct *info = (struct async_struct *)tty->driver_data;
348
349         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
350 }
351
352 static int rs_chars_in_buffer(struct tty_struct *tty)
353 {
354         struct async_struct *info = (struct async_struct *)tty->driver_data;
355
356         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
357 }
358
359 static void rs_flush_buffer(struct tty_struct *tty)
360 {
361         struct async_struct *info = (struct async_struct *)tty->driver_data;
362         unsigned long flags;
363
364         local_irq_save(flags);
365         info->xmit.head = info->xmit.tail = 0;
366         local_irq_restore(flags);
367
368         wake_up_interruptible(&tty->write_wait);
369
370         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
371             tty->ldisc.write_wakeup)
372                 (tty->ldisc.write_wakeup)(tty);
373 }
374
375 /*
376  * This function is used to send a high-priority XON/XOFF character to
377  * the device
378  */
379 static void rs_send_xchar(struct tty_struct *tty, char ch)
380 {
381         struct async_struct *info = (struct async_struct *)tty->driver_data;
382
383         info->x_char = ch;
384         if (ch) {
385                 /*
386                  * I guess we could call console->write() directly but
387                  * let's do that for now.
388                  */
389                 transmit_chars(info, NULL);
390         }
391 }
392
393 /*
394  * ------------------------------------------------------------
395  * rs_throttle()
396  *
397  * This routine is called by the upper-layer tty layer to signal that
398  * incoming characters should be throttled.
399  * ------------------------------------------------------------
400  */
401 static void rs_throttle(struct tty_struct * tty)
402 {
403         if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty));
404
405         printk(KERN_INFO "simrs_throttle called\n");
406 }
407
408 static void rs_unthrottle(struct tty_struct * tty)
409 {
410         struct async_struct *info = (struct async_struct *)tty->driver_data;
411
412         if (I_IXOFF(tty)) {
413                 if (info->x_char)
414                         info->x_char = 0;
415                 else
416                         rs_send_xchar(tty, START_CHAR(tty));
417         }
418         printk(KERN_INFO "simrs_unthrottle called\n");
419 }
420
421 /*
422  * rs_break() --- routine which turns the break handling on or off
423  */
424 static void rs_break(struct tty_struct *tty, int break_state)
425 {
426 }
427
428 static int rs_ioctl(struct tty_struct *tty, struct file * file,
429                     unsigned int cmd, unsigned long arg)
430 {
431         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
432             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
433             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
434                 if (tty->flags & (1 << TTY_IO_ERROR))
435                     return -EIO;
436         }
437
438         switch (cmd) {
439                 case TIOCMGET:
440                         printk(KERN_INFO "rs_ioctl: TIOCMGET called\n");
441                         return -EINVAL;
442                 case TIOCMBIS:
443                 case TIOCMBIC:
444                 case TIOCMSET:
445                         printk(KERN_INFO "rs_ioctl: TIOCMBIS/BIC/SET called\n");
446                         return -EINVAL;
447                 case TIOCGSERIAL:
448                         printk(KERN_INFO "simrs_ioctl TIOCGSERIAL called\n");
449                         return 0;
450                 case TIOCSSERIAL:
451                         printk(KERN_INFO "simrs_ioctl TIOCSSERIAL called\n");
452                         return 0;
453                 case TIOCSERCONFIG:
454                         printk(KERN_INFO "rs_ioctl: TIOCSERCONFIG called\n");
455                         return -EINVAL;
456
457                 case TIOCSERGETLSR: /* Get line status register */
458                         printk(KERN_INFO "rs_ioctl: TIOCSERGETLSR called\n");
459                         return  -EINVAL;
460
461                 case TIOCSERGSTRUCT:
462                         printk(KERN_INFO "rs_ioctl: TIOCSERGSTRUCT called\n");
463 #if 0
464                         if (copy_to_user((struct async_struct *) arg,
465                                          info, sizeof(struct async_struct)))
466                                 return -EFAULT;
467 #endif
468                         return 0;
469
470                 /*
471                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
472                  * - mask passed in arg for lines of interest
473                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
474                  * Caller should use TIOCGICOUNT to see which one it was
475                  */
476                 case TIOCMIWAIT:
477                         printk(KERN_INFO "rs_ioctl: TIOCMIWAIT: called\n");
478                         return 0;
479                 /*
480                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
481                  * Return: write counters to the user passed counter struct
482                  * NB: both 1->0 and 0->1 transitions are counted except for
483                  *     RI where only 0->1 is counted.
484                  */
485                 case TIOCGICOUNT:
486                         printk(KERN_INFO "rs_ioctl: TIOCGICOUNT called\n");
487                         return 0;
488
489                 case TIOCSERGWILD:
490                 case TIOCSERSWILD:
491                         /* "setserial -W" is called in Debian boot */
492                         printk (KERN_INFO "TIOCSER?WILD ioctl obsolete, ignored.\n");
493                         return 0;
494
495                 default:
496                         return -ENOIOCTLCMD;
497                 }
498         return 0;
499 }
500
501 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
502
503 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
504 {
505         unsigned int cflag = tty->termios->c_cflag;
506
507         if (   (cflag == old_termios->c_cflag)
508             && (   RELEVANT_IFLAG(tty->termios->c_iflag)
509                 == RELEVANT_IFLAG(old_termios->c_iflag)))
510           return;
511
512
513         /* Handle turning off CRTSCTS */
514         if ((old_termios->c_cflag & CRTSCTS) &&
515             !(tty->termios->c_cflag & CRTSCTS)) {
516                 tty->hw_stopped = 0;
517                 rs_start(tty);
518         }
519 }
520 /*
521  * This routine will shutdown a serial port; interrupts are disabled, and
522  * DTR is dropped if the hangup on close termio flag is on.
523  */
524 static void shutdown(struct async_struct * info)
525 {
526         unsigned long   flags;
527         struct serial_state *state;
528         int             retval;
529
530         if (!(info->flags & ASYNC_INITIALIZED)) return;
531
532         state = info->state;
533
534 #ifdef SIMSERIAL_DEBUG
535         printk("Shutting down serial port %d (irq %d)....", info->line,
536                state->irq);
537 #endif
538
539         local_irq_save(flags);
540         {
541                 /*
542                  * First unlink the serial port from the IRQ chain...
543                  */
544                 if (info->next_port)
545                         info->next_port->prev_port = info->prev_port;
546                 if (info->prev_port)
547                         info->prev_port->next_port = info->next_port;
548                 else
549                         IRQ_ports[state->irq] = info->next_port;
550
551                 /*
552                  * Free the IRQ, if necessary
553                  */
554                 if (state->irq && (!IRQ_ports[state->irq] ||
555                                    !IRQ_ports[state->irq]->next_port)) {
556                         if (IRQ_ports[state->irq]) {
557                                 free_irq(state->irq, NULL);
558                                 retval = request_irq(state->irq, rs_interrupt_single,
559                                                      IRQ_T(info), "serial", NULL);
560
561                                 if (retval)
562                                         printk(KERN_ERR "serial shutdown: request_irq: error %d"
563                                                "  Couldn't reacquire IRQ.\n", retval);
564                         } else
565                                 free_irq(state->irq, NULL);
566                 }
567
568                 if (info->xmit.buf) {
569                         free_page((unsigned long) info->xmit.buf);
570                         info->xmit.buf = 0;
571                 }
572
573                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
574
575                 info->flags &= ~ASYNC_INITIALIZED;
576         }
577         local_irq_restore(flags);
578 }
579
580 /*
581  * ------------------------------------------------------------
582  * rs_close()
583  *
584  * This routine is called when the serial port gets closed.  First, we
585  * wait for the last remaining data to be sent.  Then, we unlink its
586  * async structure from the interrupt chain if necessary, and we free
587  * that IRQ if nothing is left in the chain.
588  * ------------------------------------------------------------
589  */
590 static void rs_close(struct tty_struct *tty, struct file * filp)
591 {
592         struct async_struct * info = (struct async_struct *)tty->driver_data;
593         struct serial_state *state;
594         unsigned long flags;
595
596         if (!info ) return;
597
598         state = info->state;
599
600         local_irq_save(flags);
601         if (tty_hung_up_p(filp)) {
602 #ifdef SIMSERIAL_DEBUG
603                 printk("rs_close: hung_up\n");
604 #endif
605                 local_irq_restore(flags);
606                 return;
607         }
608 #ifdef SIMSERIAL_DEBUG
609         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
610 #endif
611         if ((tty->count == 1) && (state->count != 1)) {
612                 /*
613                  * Uh, oh.  tty->count is 1, which means that the tty
614                  * structure will be freed.  state->count should always
615                  * be one in these conditions.  If it's greater than
616                  * one, we've got real problems, since it means the
617                  * serial port won't be shutdown.
618                  */
619                 printk(KERN_ERR "rs_close: bad serial port count; tty->count is 1, "
620                        "state->count is %d\n", state->count);
621                 state->count = 1;
622         }
623         if (--state->count < 0) {
624                 printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
625                        info->line, state->count);
626                 state->count = 0;
627         }
628         if (state->count) {
629                 local_irq_restore(flags);
630                 return;
631         }
632         info->flags |= ASYNC_CLOSING;
633         local_irq_restore(flags);
634
635         /*
636          * Now we wait for the transmit buffer to clear; and we notify
637          * the line discipline to only process XON/XOFF characters.
638          */
639         shutdown(info);
640         if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty);
641         if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty);
642         info->event = 0;
643         info->tty = 0;
644         if (info->blocked_open) {
645                 if (info->close_delay) {
646                         current->state = TASK_INTERRUPTIBLE;
647                         schedule_timeout(info->close_delay);
648                 }
649                 wake_up_interruptible(&info->open_wait);
650         }
651         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
652         wake_up_interruptible(&info->close_wait);
653 }
654
655 /*
656  * rs_wait_until_sent() --- wait until the transmitter is empty
657  */
658 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
659 {
660 }
661
662
663 /*
664  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
665  */
666 static void rs_hangup(struct tty_struct *tty)
667 {
668         struct async_struct * info = (struct async_struct *)tty->driver_data;
669         struct serial_state *state = info->state;
670
671 #ifdef SIMSERIAL_DEBUG
672         printk("rs_hangup: called\n");
673 #endif
674
675         state = info->state;
676
677         rs_flush_buffer(tty);
678         if (info->flags & ASYNC_CLOSING)
679                 return;
680         shutdown(info);
681
682         info->event = 0;
683         state->count = 0;
684         info->flags &= ~ASYNC_NORMAL_ACTIVE;
685         info->tty = 0;
686         wake_up_interruptible(&info->open_wait);
687 }
688
689
690 static int get_async_struct(int line, struct async_struct **ret_info)
691 {
692         struct async_struct *info;
693         struct serial_state *sstate;
694
695         sstate = rs_table + line;
696         sstate->count++;
697         if (sstate->info) {
698                 *ret_info = sstate->info;
699                 return 0;
700         }
701         info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
702         if (!info) {
703                 sstate->count--;
704                 return -ENOMEM;
705         }
706         memset(info, 0, sizeof(struct async_struct));
707         init_waitqueue_head(&info->open_wait);
708         init_waitqueue_head(&info->close_wait);
709         init_waitqueue_head(&info->delta_msr_wait);
710         info->magic = SERIAL_MAGIC;
711         info->port = sstate->port;
712         info->flags = sstate->flags;
713         info->xmit_fifo_size = sstate->xmit_fifo_size;
714         info->line = line;
715         INIT_WORK(&info->work, do_softint, info);
716         info->state = sstate;
717         if (sstate->info) {
718                 kfree(info);
719                 *ret_info = sstate->info;
720                 return 0;
721         }
722         *ret_info = sstate->info = info;
723         return 0;
724 }
725
726 static int
727 startup(struct async_struct *info)
728 {
729         unsigned long flags;
730         int     retval=0;
731         irqreturn_t (*handler)(int, void *, struct pt_regs *);
732         struct serial_state *state= info->state;
733         unsigned long page;
734
735         page = get_zeroed_page(GFP_KERNEL);
736         if (!page)
737                 return -ENOMEM;
738
739         local_irq_save(flags);
740
741         if (info->flags & ASYNC_INITIALIZED) {
742                 free_page(page);
743                 goto errout;
744         }
745
746         if (!state->port || !state->type) {
747                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
748                 free_page(page);
749                 goto errout;
750         }
751         if (info->xmit.buf)
752                 free_page(page);
753         else
754                 info->xmit.buf = (unsigned char *) page;
755
756 #ifdef SIMSERIAL_DEBUG
757         printk("startup: ttys%d (irq %d)...", info->line, state->irq);
758 #endif
759
760         /*
761          * Allocate the IRQ if necessary
762          */
763         if (state->irq && (!IRQ_ports[state->irq] ||
764                           !IRQ_ports[state->irq]->next_port)) {
765                 if (IRQ_ports[state->irq]) {
766                         retval = -EBUSY;
767                         goto errout;
768                 } else
769                         handler = rs_interrupt_single;
770
771                 retval = request_irq(state->irq, handler, IRQ_T(info), "simserial", NULL);
772                 if (retval) {
773                         if (capable(CAP_SYS_ADMIN)) {
774                                 if (info->tty)
775                                         set_bit(TTY_IO_ERROR,
776                                                 &info->tty->flags);
777                                 retval = 0;
778                         }
779                         goto errout;
780                 }
781         }
782
783         /*
784          * Insert serial port into IRQ chain.
785          */
786         info->prev_port = 0;
787         info->next_port = IRQ_ports[state->irq];
788         if (info->next_port)
789                 info->next_port->prev_port = info;
790         IRQ_ports[state->irq] = info;
791
792         if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags);
793
794         info->xmit.head = info->xmit.tail = 0;
795
796 #if 0
797         /*
798          * Set up serial timers...
799          */
800         timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
801         timer_active |= 1 << RS_TIMER;
802 #endif
803
804         /*
805          * Set up the tty->alt_speed kludge
806          */
807         if (info->tty) {
808                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
809                         info->tty->alt_speed = 57600;
810                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
811                         info->tty->alt_speed = 115200;
812                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
813                         info->tty->alt_speed = 230400;
814                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
815                         info->tty->alt_speed = 460800;
816         }
817
818         info->flags |= ASYNC_INITIALIZED;
819         local_irq_restore(flags);
820         return 0;
821
822 errout:
823         local_irq_restore(flags);
824         return retval;
825 }
826
827
828 /*
829  * This routine is called whenever a serial port is opened.  It
830  * enables interrupts for a serial port, linking in its async structure into
831  * the IRQ chain.   It also performs the serial-specific
832  * initialization for the tty structure.
833  */
834 static int rs_open(struct tty_struct *tty, struct file * filp)
835 {
836         struct async_struct     *info;
837         int                     retval, line;
838         unsigned long           page;
839
840         line = tty->index;
841         if ((line < 0) || (line >= NR_PORTS))
842                 return -ENODEV;
843         retval = get_async_struct(line, &info);
844         if (retval)
845                 return retval;
846         tty->driver_data = info;
847         info->tty = tty;
848
849 #ifdef SIMSERIAL_DEBUG
850         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
851 #endif
852         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
853
854         if (!tmp_buf) {
855                 page = get_zeroed_page(GFP_KERNEL);
856                 if (!page)
857                         return -ENOMEM;
858                 if (tmp_buf)
859                         free_page(page);
860                 else
861                         tmp_buf = (unsigned char *) page;
862         }
863
864         /*
865          * If the port is the middle of closing, bail out now
866          */
867         if (tty_hung_up_p(filp) ||
868             (info->flags & ASYNC_CLOSING)) {
869                 if (info->flags & ASYNC_CLOSING)
870                         interruptible_sleep_on(&info->close_wait);
871 #ifdef SERIAL_DO_RESTART
872                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
873                         -EAGAIN : -ERESTARTSYS);
874 #else
875                 return -EAGAIN;
876 #endif
877         }
878
879         /*
880          * Start up serial port
881          */
882         retval = startup(info);
883         if (retval) {
884                 return retval;
885         }
886
887         /*
888          * figure out which console to use (should be one already)
889          */
890         console = console_drivers;
891         while (console) {
892                 if ((console->flags & CON_ENABLED) && console->write) break;
893                 console = console->next;
894         }
895
896 #ifdef SIMSERIAL_DEBUG
897         printk("rs_open ttys%d successful\n", info->line);
898 #endif
899         return 0;
900 }
901
902 /*
903  * /proc fs routines....
904  */
905
906 static inline int line_info(char *buf, struct serial_state *state)
907 {
908         return sprintf(buf, "%d: uart:%s port:%lX irq:%d\n",
909                        state->line, uart_config[state->type].name,
910                        state->port, state->irq);
911 }
912
913 static int rs_read_proc(char *page, char **start, off_t off, int count,
914                  int *eof, void *data)
915 {
916         int i, len = 0, l;
917         off_t   begin = 0;
918
919         len += sprintf(page, "simserinfo:1.0 driver:%s\n", serial_version);
920         for (i = 0; i < NR_PORTS && len < 4000; i++) {
921                 l = line_info(page + len, &rs_table[i]);
922                 len += l;
923                 if (len+begin > off+count)
924                         goto done;
925                 if (len+begin < off) {
926                         begin += len;
927                         len = 0;
928                 }
929         }
930         *eof = 1;
931 done:
932         if (off >= len+begin)
933                 return 0;
934         *start = page + (begin-off);
935         return ((count < begin+len-off) ? count : begin+len-off);
936 }
937
938 /*
939  * ---------------------------------------------------------------------
940  * rs_init() and friends
941  *
942  * rs_init() is called at boot-time to initialize the serial driver.
943  * ---------------------------------------------------------------------
944  */
945
946 /*
947  * This routine prints out the appropriate serial driver version
948  * number, and identifies which options were configured into this
949  * driver.
950  */
951 static inline void show_serial_version(void)
952 {
953         printk(KERN_INFO "%s version %s with", serial_name, serial_version);
954         printk(KERN_INFO " no serial options enabled\n");
955 }
956
957 static struct tty_operations hp_ops = {
958         .open = rs_open,
959         .close = rs_close,
960         .write = rs_write,
961         .put_char = rs_put_char,
962         .flush_chars = rs_flush_chars,
963         .write_room = rs_write_room,
964         .chars_in_buffer = rs_chars_in_buffer,
965         .flush_buffer = rs_flush_buffer,
966         .ioctl = rs_ioctl,
967         .throttle = rs_throttle,
968         .unthrottle = rs_unthrottle,
969         .send_xchar = rs_send_xchar,
970         .set_termios = rs_set_termios,
971         .stop = rs_stop,
972         .start = rs_start,
973         .hangup = rs_hangup,
974         .break_ctl = rs_break,
975         .wait_until_sent = rs_wait_until_sent,
976         .read_proc = rs_read_proc,
977 };
978
979 /*
980  * The serial driver boot-time initialization code!
981  */
982 static int __init
983 simrs_init (void)
984 {
985         int                     i, rc;
986         struct serial_state     *state;
987
988         if (!ia64_platform_is("hpsim"))
989                 return -ENODEV;
990
991         hp_simserial_driver = alloc_tty_driver(1);
992         if (!hp_simserial_driver)
993                 return -ENOMEM;
994
995         show_serial_version();
996
997         /* Initialize the tty_driver structure */
998
999         hp_simserial_driver->owner = THIS_MODULE;
1000         hp_simserial_driver->driver_name = "simserial";
1001         hp_simserial_driver->name = "ttyS";
1002         hp_simserial_driver->major = TTY_MAJOR;
1003         hp_simserial_driver->minor_start = 64;
1004         hp_simserial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1005         hp_simserial_driver->subtype = SERIAL_TYPE_NORMAL;
1006         hp_simserial_driver->init_termios = tty_std_termios;
1007         hp_simserial_driver->init_termios.c_cflag =
1008                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1009         hp_simserial_driver->flags = TTY_DRIVER_REAL_RAW;
1010         tty_set_operations(hp_simserial_driver, &hp_ops);
1011
1012         /*
1013          * Let's have a little bit of fun !
1014          */
1015         for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
1016
1017                 if (state->type == PORT_UNKNOWN) continue;
1018
1019                 if (!state->irq) {
1020                         if ((rc = assign_irq_vector(AUTO_ASSIGN)) < 0)
1021                                 panic("%s: out of interrupt vectors!\n",
1022                                       __FUNCTION__);
1023                         state->irq = rc;
1024                         ia64_ssc_connect_irq(KEYBOARD_INTR, state->irq);
1025                 }
1026
1027                 printk(KERN_INFO "ttyS%d at 0x%04lx (irq = %d) is a %s\n",
1028                        state->line,
1029                        state->port, state->irq,
1030                        uart_config[state->type].name);
1031         }
1032
1033         if (tty_register_driver(hp_simserial_driver))
1034                 panic("Couldn't register simserial driver\n");
1035
1036         return 0;
1037 }
1038
1039 #ifndef MODULE
1040 __initcall(simrs_init);
1041 #endif