IRQ: Use the new typedef for interrupt handler function pointers
[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/slab.h>
28 #include <linux/capability.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
49 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED : IRQF_DISABLED)
50
51 #define SSC_GETCHAR     21
52
53 extern long ia64_ssc (long, long, long, long, int);
54 extern void ia64_ssc_connect_irq (long intr, long irq);
55
56 static char *serial_name = "SimSerial driver";
57 static char *serial_version = "0.6";
58
59 /*
60  * This has been extracted from asm/serial.h. We need one eventually but
61  * I don't know exactly what we're going to put in it so just fake one
62  * for now.
63  */
64 #define BASE_BAUD ( 1843200 / 16 )
65
66 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
67
68 /*
69  * Most of the values here are meaningless to this particular driver.
70  * However some values must be preserved for the code (leveraged from serial.c
71  * to work correctly).
72  * port must not be 0
73  * type must not be UNKNOWN
74  * So I picked arbitrary (guess from where?) values instead
75  */
76 static struct serial_state rs_table[NR_PORTS]={
77   /* UART CLK   PORT IRQ     FLAGS        */
78   { 0, BASE_BAUD, 0x3F8, 0, STD_COM_FLAGS,0,PORT_16550 }  /* ttyS0 */
79 };
80
81 /*
82  * Just for the fun of it !
83  */
84 static struct serial_uart_config uart_config[] = {
85         { "unknown", 1, 0 },
86         { "8250", 1, 0 },
87         { "16450", 1, 0 },
88         { "16550", 1, 0 },
89         { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
90         { "cirrus", 1, 0 },
91         { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
92         { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
93                   UART_STARTECH },
94         { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
95         { 0, 0}
96 };
97
98 struct tty_driver *hp_simserial_driver;
99
100 static struct async_struct *IRQ_ports[NR_IRQS];
101
102 static struct console *console;
103
104 static unsigned char *tmp_buf;
105
106 extern struct console *console_drivers; /* from kernel/printk.c */
107
108 /*
109  * ------------------------------------------------------------
110  * rs_stop() and rs_start()
111  *
112  * This routines are called before setting or resetting tty->stopped.
113  * They enable or disable transmitter interrupts, as necessary.
114  * ------------------------------------------------------------
115  */
116 static void rs_stop(struct tty_struct *tty)
117 {
118 #ifdef SIMSERIAL_DEBUG
119         printk("rs_stop: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
120                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
121 #endif
122
123 }
124
125 static void rs_start(struct tty_struct *tty)
126 {
127 #ifdef SIMSERIAL_DEBUG
128         printk("rs_start: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
129                 tty->stopped, tty->hw_stopped, tty->flow_stopped);
130 #endif
131 }
132
133 static  void receive_chars(struct tty_struct *tty)
134 {
135         unsigned char ch;
136         static unsigned char seen_esc = 0;
137
138         while ( (ch = ia64_ssc(0, 0, 0, 0, SSC_GETCHAR)) ) {
139                 if ( ch == 27 && seen_esc == 0 ) {
140                         seen_esc = 1;
141                         continue;
142                 } else {
143                         if ( seen_esc==1 && ch == 'O' ) {
144                                 seen_esc = 2;
145                                 continue;
146                         } else if ( seen_esc == 2 ) {
147                                 if ( ch == 'P' ) /* F1 */
148                                         show_state();
149 #ifdef CONFIG_MAGIC_SYSRQ
150                                 if ( ch == 'S' ) { /* F4 */
151                                         do
152                                                 ch = ia64_ssc(0, 0, 0, 0,
153                                                               SSC_GETCHAR);
154                                         while (!ch);
155                                         handle_sysrq(ch, NULL);
156                                 }
157 #endif
158                                 seen_esc = 0;
159                                 continue;
160                         }
161                 }
162                 seen_esc = 0;
163
164                 if (tty_insert_flip_char(tty, ch, TTY_NORMAL) == 0)
165                         break;
166         }
167         tty_flip_buffer_push(tty);
168 }
169
170 /*
171  * This is the serial driver's interrupt routine for a single port
172  */
173 static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
174 {
175         struct async_struct * info;
176
177         /*
178          * I don't know exactly why they don't use the dev_id opaque data
179          * pointer instead of this extra lookup table
180          */
181         info = IRQ_ports[irq];
182         if (!info || !info->tty) {
183                 printk(KERN_INFO "simrs_interrupt_single: info|tty=0 info=%p problem\n", info);
184                 return IRQ_NONE;
185         }
186         /*
187          * pretty simple in our case, because we only get interrupts
188          * on inbound traffic
189          */
190         receive_chars(info->tty);
191         return IRQ_HANDLED;
192 }
193
194 /*
195  * -------------------------------------------------------------------
196  * Here ends the serial interrupt routines.
197  * -------------------------------------------------------------------
198  */
199
200 #if 0
201 /*
202  * not really used in our situation so keep them commented out for now
203  */
204 static DECLARE_TASK_QUEUE(tq_serial); /* used to be at the top of the file */
205 static void do_serial_bh(void)
206 {
207         run_task_queue(&tq_serial);
208         printk(KERN_ERR "do_serial_bh: called\n");
209 }
210 #endif
211
212 static void do_softint(void *private_)
213 {
214         printk(KERN_ERR "simserial: do_softint called\n");
215 }
216
217 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
218 {
219         struct async_struct *info = (struct async_struct *)tty->driver_data;
220         unsigned long flags;
221
222         if (!tty || !info->xmit.buf) return;
223
224         local_irq_save(flags);
225         if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) {
226                 local_irq_restore(flags);
227                 return;
228         }
229         info->xmit.buf[info->xmit.head] = ch;
230         info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1);
231         local_irq_restore(flags);
232 }
233
234 static void transmit_chars(struct async_struct *info, int *intr_done)
235 {
236         int count;
237         unsigned long flags;
238
239
240         local_irq_save(flags);
241
242         if (info->x_char) {
243                 char c = info->x_char;
244
245                 console->write(console, &c, 1);
246
247                 info->state->icount.tx++;
248                 info->x_char = 0;
249
250                 goto out;
251         }
252
253         if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) {
254 #ifdef SIMSERIAL_DEBUG
255                 printk("transmit_chars: head=%d, tail=%d, stopped=%d\n",
256                        info->xmit.head, info->xmit.tail, info->tty->stopped);
257 #endif
258                 goto out;
259         }
260         /*
261          * We removed the loop and try to do it in to chunks. We need
262          * 2 operations maximum because it's a ring buffer.
263          *
264          * First from current to tail if possible.
265          * Then from the beginning of the buffer until necessary
266          */
267
268         count = min(CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE),
269                     SERIAL_XMIT_SIZE - info->xmit.tail);
270         console->write(console, info->xmit.buf+info->xmit.tail, count);
271
272         info->xmit.tail = (info->xmit.tail+count) & (SERIAL_XMIT_SIZE-1);
273
274         /*
275          * We have more at the beginning of the buffer
276          */
277         count = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
278         if (count) {
279                 console->write(console, info->xmit.buf, count);
280                 info->xmit.tail += count;
281         }
282 out:
283         local_irq_restore(flags);
284 }
285
286 static void rs_flush_chars(struct tty_struct *tty)
287 {
288         struct async_struct *info = (struct async_struct *)tty->driver_data;
289
290         if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped ||
291             !info->xmit.buf)
292                 return;
293
294         transmit_chars(info, NULL);
295 }
296
297
298 static int rs_write(struct tty_struct * tty,
299                     const unsigned char *buf, int count)
300 {
301         int     c, ret = 0;
302         struct async_struct *info = (struct async_struct *)tty->driver_data;
303         unsigned long flags;
304
305         if (!tty || !info->xmit.buf || !tmp_buf) return 0;
306
307         local_irq_save(flags);
308         while (1) {
309                 c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
310                 if (count < c)
311                         c = count;
312                 if (c <= 0) {
313                         break;
314                 }
315                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
316                 info->xmit.head = ((info->xmit.head + c) &
317                                    (SERIAL_XMIT_SIZE-1));
318                 buf += c;
319                 count -= c;
320                 ret += c;
321         }
322         local_irq_restore(flags);
323         /*
324          * Hey, we transmit directly from here in our case
325          */
326         if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE)
327             && !tty->stopped && !tty->hw_stopped) {
328                 transmit_chars(info, NULL);
329         }
330         return ret;
331 }
332
333 static int rs_write_room(struct tty_struct *tty)
334 {
335         struct async_struct *info = (struct async_struct *)tty->driver_data;
336
337         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
338 }
339
340 static int rs_chars_in_buffer(struct tty_struct *tty)
341 {
342         struct async_struct *info = (struct async_struct *)tty->driver_data;
343
344         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
345 }
346
347 static void rs_flush_buffer(struct tty_struct *tty)
348 {
349         struct async_struct *info = (struct async_struct *)tty->driver_data;
350         unsigned long flags;
351
352         local_irq_save(flags);
353         info->xmit.head = info->xmit.tail = 0;
354         local_irq_restore(flags);
355
356         wake_up_interruptible(&tty->write_wait);
357
358         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
359             tty->ldisc.write_wakeup)
360                 (tty->ldisc.write_wakeup)(tty);
361 }
362
363 /*
364  * This function is used to send a high-priority XON/XOFF character to
365  * the device
366  */
367 static void rs_send_xchar(struct tty_struct *tty, char ch)
368 {
369         struct async_struct *info = (struct async_struct *)tty->driver_data;
370
371         info->x_char = ch;
372         if (ch) {
373                 /*
374                  * I guess we could call console->write() directly but
375                  * let's do that for now.
376                  */
377                 transmit_chars(info, NULL);
378         }
379 }
380
381 /*
382  * ------------------------------------------------------------
383  * rs_throttle()
384  *
385  * This routine is called by the upper-layer tty layer to signal that
386  * incoming characters should be throttled.
387  * ------------------------------------------------------------
388  */
389 static void rs_throttle(struct tty_struct * tty)
390 {
391         if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty));
392
393         printk(KERN_INFO "simrs_throttle called\n");
394 }
395
396 static void rs_unthrottle(struct tty_struct * tty)
397 {
398         struct async_struct *info = (struct async_struct *)tty->driver_data;
399
400         if (I_IXOFF(tty)) {
401                 if (info->x_char)
402                         info->x_char = 0;
403                 else
404                         rs_send_xchar(tty, START_CHAR(tty));
405         }
406         printk(KERN_INFO "simrs_unthrottle called\n");
407 }
408
409 /*
410  * rs_break() --- routine which turns the break handling on or off
411  */
412 static void rs_break(struct tty_struct *tty, int break_state)
413 {
414 }
415
416 static int rs_ioctl(struct tty_struct *tty, struct file * file,
417                     unsigned int cmd, unsigned long arg)
418 {
419         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
420             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
421             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
422                 if (tty->flags & (1 << TTY_IO_ERROR))
423                     return -EIO;
424         }
425
426         switch (cmd) {
427                 case TIOCMGET:
428                         printk(KERN_INFO "rs_ioctl: TIOCMGET called\n");
429                         return -EINVAL;
430                 case TIOCMBIS:
431                 case TIOCMBIC:
432                 case TIOCMSET:
433                         printk(KERN_INFO "rs_ioctl: TIOCMBIS/BIC/SET called\n");
434                         return -EINVAL;
435                 case TIOCGSERIAL:
436                         printk(KERN_INFO "simrs_ioctl TIOCGSERIAL called\n");
437                         return 0;
438                 case TIOCSSERIAL:
439                         printk(KERN_INFO "simrs_ioctl TIOCSSERIAL called\n");
440                         return 0;
441                 case TIOCSERCONFIG:
442                         printk(KERN_INFO "rs_ioctl: TIOCSERCONFIG called\n");
443                         return -EINVAL;
444
445                 case TIOCSERGETLSR: /* Get line status register */
446                         printk(KERN_INFO "rs_ioctl: TIOCSERGETLSR called\n");
447                         return  -EINVAL;
448
449                 case TIOCSERGSTRUCT:
450                         printk(KERN_INFO "rs_ioctl: TIOCSERGSTRUCT called\n");
451 #if 0
452                         if (copy_to_user((struct async_struct *) arg,
453                                          info, sizeof(struct async_struct)))
454                                 return -EFAULT;
455 #endif
456                         return 0;
457
458                 /*
459                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
460                  * - mask passed in arg for lines of interest
461                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
462                  * Caller should use TIOCGICOUNT to see which one it was
463                  */
464                 case TIOCMIWAIT:
465                         printk(KERN_INFO "rs_ioctl: TIOCMIWAIT: called\n");
466                         return 0;
467                 /*
468                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
469                  * Return: write counters to the user passed counter struct
470                  * NB: both 1->0 and 0->1 transitions are counted except for
471                  *     RI where only 0->1 is counted.
472                  */
473                 case TIOCGICOUNT:
474                         printk(KERN_INFO "rs_ioctl: TIOCGICOUNT called\n");
475                         return 0;
476
477                 case TIOCSERGWILD:
478                 case TIOCSERSWILD:
479                         /* "setserial -W" is called in Debian boot */
480                         printk (KERN_INFO "TIOCSER?WILD ioctl obsolete, ignored.\n");
481                         return 0;
482
483                 default:
484                         return -ENOIOCTLCMD;
485                 }
486         return 0;
487 }
488
489 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
490
491 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
492 {
493         unsigned int cflag = tty->termios->c_cflag;
494
495         if (   (cflag == old_termios->c_cflag)
496             && (   RELEVANT_IFLAG(tty->termios->c_iflag)
497                 == RELEVANT_IFLAG(old_termios->c_iflag)))
498           return;
499
500
501         /* Handle turning off CRTSCTS */
502         if ((old_termios->c_cflag & CRTSCTS) &&
503             !(tty->termios->c_cflag & CRTSCTS)) {
504                 tty->hw_stopped = 0;
505                 rs_start(tty);
506         }
507 }
508 /*
509  * This routine will shutdown a serial port; interrupts are disabled, and
510  * DTR is dropped if the hangup on close termio flag is on.
511  */
512 static void shutdown(struct async_struct * info)
513 {
514         unsigned long   flags;
515         struct serial_state *state;
516         int             retval;
517
518         if (!(info->flags & ASYNC_INITIALIZED)) return;
519
520         state = info->state;
521
522 #ifdef SIMSERIAL_DEBUG
523         printk("Shutting down serial port %d (irq %d)....", info->line,
524                state->irq);
525 #endif
526
527         local_irq_save(flags);
528         {
529                 /*
530                  * First unlink the serial port from the IRQ chain...
531                  */
532                 if (info->next_port)
533                         info->next_port->prev_port = info->prev_port;
534                 if (info->prev_port)
535                         info->prev_port->next_port = info->next_port;
536                 else
537                         IRQ_ports[state->irq] = info->next_port;
538
539                 /*
540                  * Free the IRQ, if necessary
541                  */
542                 if (state->irq && (!IRQ_ports[state->irq] ||
543                                    !IRQ_ports[state->irq]->next_port)) {
544                         if (IRQ_ports[state->irq]) {
545                                 free_irq(state->irq, NULL);
546                                 retval = request_irq(state->irq, rs_interrupt_single,
547                                                      IRQ_T(info), "serial", NULL);
548
549                                 if (retval)
550                                         printk(KERN_ERR "serial shutdown: request_irq: error %d"
551                                                "  Couldn't reacquire IRQ.\n", retval);
552                         } else
553                                 free_irq(state->irq, NULL);
554                 }
555
556                 if (info->xmit.buf) {
557                         free_page((unsigned long) info->xmit.buf);
558                         info->xmit.buf = 0;
559                 }
560
561                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
562
563                 info->flags &= ~ASYNC_INITIALIZED;
564         }
565         local_irq_restore(flags);
566 }
567
568 /*
569  * ------------------------------------------------------------
570  * rs_close()
571  *
572  * This routine is called when the serial port gets closed.  First, we
573  * wait for the last remaining data to be sent.  Then, we unlink its
574  * async structure from the interrupt chain if necessary, and we free
575  * that IRQ if nothing is left in the chain.
576  * ------------------------------------------------------------
577  */
578 static void rs_close(struct tty_struct *tty, struct file * filp)
579 {
580         struct async_struct * info = (struct async_struct *)tty->driver_data;
581         struct serial_state *state;
582         unsigned long flags;
583
584         if (!info ) return;
585
586         state = info->state;
587
588         local_irq_save(flags);
589         if (tty_hung_up_p(filp)) {
590 #ifdef SIMSERIAL_DEBUG
591                 printk("rs_close: hung_up\n");
592 #endif
593                 local_irq_restore(flags);
594                 return;
595         }
596 #ifdef SIMSERIAL_DEBUG
597         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
598 #endif
599         if ((tty->count == 1) && (state->count != 1)) {
600                 /*
601                  * Uh, oh.  tty->count is 1, which means that the tty
602                  * structure will be freed.  state->count should always
603                  * be one in these conditions.  If it's greater than
604                  * one, we've got real problems, since it means the
605                  * serial port won't be shutdown.
606                  */
607                 printk(KERN_ERR "rs_close: bad serial port count; tty->count is 1, "
608                        "state->count is %d\n", state->count);
609                 state->count = 1;
610         }
611         if (--state->count < 0) {
612                 printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
613                        info->line, state->count);
614                 state->count = 0;
615         }
616         if (state->count) {
617                 local_irq_restore(flags);
618                 return;
619         }
620         info->flags |= ASYNC_CLOSING;
621         local_irq_restore(flags);
622
623         /*
624          * Now we wait for the transmit buffer to clear; and we notify
625          * the line discipline to only process XON/XOFF characters.
626          */
627         shutdown(info);
628         if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty);
629         if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty);
630         info->event = 0;
631         info->tty = 0;
632         if (info->blocked_open) {
633                 if (info->close_delay)
634                         schedule_timeout_interruptible(info->close_delay);
635                 wake_up_interruptible(&info->open_wait);
636         }
637         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
638         wake_up_interruptible(&info->close_wait);
639 }
640
641 /*
642  * rs_wait_until_sent() --- wait until the transmitter is empty
643  */
644 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
645 {
646 }
647
648
649 /*
650  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
651  */
652 static void rs_hangup(struct tty_struct *tty)
653 {
654         struct async_struct * info = (struct async_struct *)tty->driver_data;
655         struct serial_state *state = info->state;
656
657 #ifdef SIMSERIAL_DEBUG
658         printk("rs_hangup: called\n");
659 #endif
660
661         state = info->state;
662
663         rs_flush_buffer(tty);
664         if (info->flags & ASYNC_CLOSING)
665                 return;
666         shutdown(info);
667
668         info->event = 0;
669         state->count = 0;
670         info->flags &= ~ASYNC_NORMAL_ACTIVE;
671         info->tty = 0;
672         wake_up_interruptible(&info->open_wait);
673 }
674
675
676 static int get_async_struct(int line, struct async_struct **ret_info)
677 {
678         struct async_struct *info;
679         struct serial_state *sstate;
680
681         sstate = rs_table + line;
682         sstate->count++;
683         if (sstate->info) {
684                 *ret_info = sstate->info;
685                 return 0;
686         }
687         info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
688         if (!info) {
689                 sstate->count--;
690                 return -ENOMEM;
691         }
692         memset(info, 0, sizeof(struct async_struct));
693         init_waitqueue_head(&info->open_wait);
694         init_waitqueue_head(&info->close_wait);
695         init_waitqueue_head(&info->delta_msr_wait);
696         info->magic = SERIAL_MAGIC;
697         info->port = sstate->port;
698         info->flags = sstate->flags;
699         info->xmit_fifo_size = sstate->xmit_fifo_size;
700         info->line = line;
701         INIT_WORK(&info->work, do_softint, info);
702         info->state = sstate;
703         if (sstate->info) {
704                 kfree(info);
705                 *ret_info = sstate->info;
706                 return 0;
707         }
708         *ret_info = sstate->info = info;
709         return 0;
710 }
711
712 static int
713 startup(struct async_struct *info)
714 {
715         unsigned long flags;
716         int     retval=0;
717         irq_handler_t handler;
718         struct serial_state *state= info->state;
719         unsigned long page;
720
721         page = get_zeroed_page(GFP_KERNEL);
722         if (!page)
723                 return -ENOMEM;
724
725         local_irq_save(flags);
726
727         if (info->flags & ASYNC_INITIALIZED) {
728                 free_page(page);
729                 goto errout;
730         }
731
732         if (!state->port || !state->type) {
733                 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
734                 free_page(page);
735                 goto errout;
736         }
737         if (info->xmit.buf)
738                 free_page(page);
739         else
740                 info->xmit.buf = (unsigned char *) page;
741
742 #ifdef SIMSERIAL_DEBUG
743         printk("startup: ttys%d (irq %d)...", info->line, state->irq);
744 #endif
745
746         /*
747          * Allocate the IRQ if necessary
748          */
749         if (state->irq && (!IRQ_ports[state->irq] ||
750                           !IRQ_ports[state->irq]->next_port)) {
751                 if (IRQ_ports[state->irq]) {
752                         retval = -EBUSY;
753                         goto errout;
754                 } else
755                         handler = rs_interrupt_single;
756
757                 retval = request_irq(state->irq, handler, IRQ_T(info), "simserial", NULL);
758                 if (retval) {
759                         if (capable(CAP_SYS_ADMIN)) {
760                                 if (info->tty)
761                                         set_bit(TTY_IO_ERROR,
762                                                 &info->tty->flags);
763                                 retval = 0;
764                         }
765                         goto errout;
766                 }
767         }
768
769         /*
770          * Insert serial port into IRQ chain.
771          */
772         info->prev_port = 0;
773         info->next_port = IRQ_ports[state->irq];
774         if (info->next_port)
775                 info->next_port->prev_port = info;
776         IRQ_ports[state->irq] = info;
777
778         if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags);
779
780         info->xmit.head = info->xmit.tail = 0;
781
782 #if 0
783         /*
784          * Set up serial timers...
785          */
786         timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
787         timer_active |= 1 << RS_TIMER;
788 #endif
789
790         /*
791          * Set up the tty->alt_speed kludge
792          */
793         if (info->tty) {
794                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
795                         info->tty->alt_speed = 57600;
796                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
797                         info->tty->alt_speed = 115200;
798                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
799                         info->tty->alt_speed = 230400;
800                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
801                         info->tty->alt_speed = 460800;
802         }
803
804         info->flags |= ASYNC_INITIALIZED;
805         local_irq_restore(flags);
806         return 0;
807
808 errout:
809         local_irq_restore(flags);
810         return retval;
811 }
812
813
814 /*
815  * This routine is called whenever a serial port is opened.  It
816  * enables interrupts for a serial port, linking in its async structure into
817  * the IRQ chain.   It also performs the serial-specific
818  * initialization for the tty structure.
819  */
820 static int rs_open(struct tty_struct *tty, struct file * filp)
821 {
822         struct async_struct     *info;
823         int                     retval, line;
824         unsigned long           page;
825
826         line = tty->index;
827         if ((line < 0) || (line >= NR_PORTS))
828                 return -ENODEV;
829         retval = get_async_struct(line, &info);
830         if (retval)
831                 return retval;
832         tty->driver_data = info;
833         info->tty = tty;
834
835 #ifdef SIMSERIAL_DEBUG
836         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
837 #endif
838         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
839
840         if (!tmp_buf) {
841                 page = get_zeroed_page(GFP_KERNEL);
842                 if (!page)
843                         return -ENOMEM;
844                 if (tmp_buf)
845                         free_page(page);
846                 else
847                         tmp_buf = (unsigned char *) page;
848         }
849
850         /*
851          * If the port is the middle of closing, bail out now
852          */
853         if (tty_hung_up_p(filp) ||
854             (info->flags & ASYNC_CLOSING)) {
855                 if (info->flags & ASYNC_CLOSING)
856                         interruptible_sleep_on(&info->close_wait);
857 #ifdef SERIAL_DO_RESTART
858                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
859                         -EAGAIN : -ERESTARTSYS);
860 #else
861                 return -EAGAIN;
862 #endif
863         }
864
865         /*
866          * Start up serial port
867          */
868         retval = startup(info);
869         if (retval) {
870                 return retval;
871         }
872
873         /*
874          * figure out which console to use (should be one already)
875          */
876         console = console_drivers;
877         while (console) {
878                 if ((console->flags & CON_ENABLED) && console->write) break;
879                 console = console->next;
880         }
881
882 #ifdef SIMSERIAL_DEBUG
883         printk("rs_open ttys%d successful\n", info->line);
884 #endif
885         return 0;
886 }
887
888 /*
889  * /proc fs routines....
890  */
891
892 static inline int line_info(char *buf, struct serial_state *state)
893 {
894         return sprintf(buf, "%d: uart:%s port:%lX irq:%d\n",
895                        state->line, uart_config[state->type].name,
896                        state->port, state->irq);
897 }
898
899 static int rs_read_proc(char *page, char **start, off_t off, int count,
900                  int *eof, void *data)
901 {
902         int i, len = 0, l;
903         off_t   begin = 0;
904
905         len += sprintf(page, "simserinfo:1.0 driver:%s\n", serial_version);
906         for (i = 0; i < NR_PORTS && len < 4000; i++) {
907                 l = line_info(page + len, &rs_table[i]);
908                 len += l;
909                 if (len+begin > off+count)
910                         goto done;
911                 if (len+begin < off) {
912                         begin += len;
913                         len = 0;
914                 }
915         }
916         *eof = 1;
917 done:
918         if (off >= len+begin)
919                 return 0;
920         *start = page + (begin-off);
921         return ((count < begin+len-off) ? count : begin+len-off);
922 }
923
924 /*
925  * ---------------------------------------------------------------------
926  * rs_init() and friends
927  *
928  * rs_init() is called at boot-time to initialize the serial driver.
929  * ---------------------------------------------------------------------
930  */
931
932 /*
933  * This routine prints out the appropriate serial driver version
934  * number, and identifies which options were configured into this
935  * driver.
936  */
937 static inline void show_serial_version(void)
938 {
939         printk(KERN_INFO "%s version %s with", serial_name, serial_version);
940         printk(KERN_INFO " no serial options enabled\n");
941 }
942
943 static const struct tty_operations hp_ops = {
944         .open = rs_open,
945         .close = rs_close,
946         .write = rs_write,
947         .put_char = rs_put_char,
948         .flush_chars = rs_flush_chars,
949         .write_room = rs_write_room,
950         .chars_in_buffer = rs_chars_in_buffer,
951         .flush_buffer = rs_flush_buffer,
952         .ioctl = rs_ioctl,
953         .throttle = rs_throttle,
954         .unthrottle = rs_unthrottle,
955         .send_xchar = rs_send_xchar,
956         .set_termios = rs_set_termios,
957         .stop = rs_stop,
958         .start = rs_start,
959         .hangup = rs_hangup,
960         .break_ctl = rs_break,
961         .wait_until_sent = rs_wait_until_sent,
962         .read_proc = rs_read_proc,
963 };
964
965 /*
966  * The serial driver boot-time initialization code!
967  */
968 static int __init
969 simrs_init (void)
970 {
971         int                     i, rc;
972         struct serial_state     *state;
973
974         if (!ia64_platform_is("hpsim"))
975                 return -ENODEV;
976
977         hp_simserial_driver = alloc_tty_driver(1);
978         if (!hp_simserial_driver)
979                 return -ENOMEM;
980
981         show_serial_version();
982
983         /* Initialize the tty_driver structure */
984
985         hp_simserial_driver->owner = THIS_MODULE;
986         hp_simserial_driver->driver_name = "simserial";
987         hp_simserial_driver->name = "ttyS";
988         hp_simserial_driver->major = TTY_MAJOR;
989         hp_simserial_driver->minor_start = 64;
990         hp_simserial_driver->type = TTY_DRIVER_TYPE_SERIAL;
991         hp_simserial_driver->subtype = SERIAL_TYPE_NORMAL;
992         hp_simserial_driver->init_termios = tty_std_termios;
993         hp_simserial_driver->init_termios.c_cflag =
994                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
995         hp_simserial_driver->flags = TTY_DRIVER_REAL_RAW;
996         tty_set_operations(hp_simserial_driver, &hp_ops);
997
998         /*
999          * Let's have a little bit of fun !
1000          */
1001         for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
1002
1003                 if (state->type == PORT_UNKNOWN) continue;
1004
1005                 if (!state->irq) {
1006                         if ((rc = assign_irq_vector(AUTO_ASSIGN)) < 0)
1007                                 panic("%s: out of interrupt vectors!\n",
1008                                       __FUNCTION__);
1009                         state->irq = rc;
1010                         ia64_ssc_connect_irq(KEYBOARD_INTR, state->irq);
1011                 }
1012
1013                 printk(KERN_INFO "ttyS%d at 0x%04lx (irq = %d) is a %s\n",
1014                        state->line,
1015                        state->port, state->irq,
1016                        uart_config[state->type].name);
1017         }
1018
1019         if (tty_register_driver(hp_simserial_driver))
1020                 panic("Couldn't register simserial driver\n");
1021
1022         return 0;
1023 }
1024
1025 #ifndef MODULE
1026 __initcall(simrs_init);
1027 #endif