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-rw-r--r--arch/ia64/hp/sim/simserial.c1032
1 files changed, 1032 insertions, 0 deletions
diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
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+++ b/arch/ia64/hp/sim/simserial.c
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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
34#include <asm/irq.h>
35#include <asm/hw_irq.h>
36#include <asm/uaccess.h>
37
38#ifdef CONFIG_KDB
39# include <linux/kdb.h>
40#endif
41
42#undef SIMSERIAL_DEBUG /* define this to get some debug information */
43
44#define KEYBOARD_INTR 3 /* must match with simulator! */
45
46#define NR_PORTS 1 /* only one port for now */
47#define SERIAL_INLINE 1
48
49#ifdef SERIAL_INLINE
50#define _INLINE_ inline
51#endif
52
53#define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
54
55#define SSC_GETCHAR 21
56
57extern long ia64_ssc (long, long, long, long, int);
58extern void ia64_ssc_connect_irq (long intr, long irq);
59
60static char *serial_name = "SimSerial driver";
61static char *serial_version = "0.6";
62
63/*
64 * This has been extracted from asm/serial.h. We need one eventually but
65 * I don't know exactly what we're going to put in it so just fake one
66 * for now.
67 */
68#define BASE_BAUD ( 1843200 / 16 )
69
70#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
71
72/*
73 * Most of the values here are meaningless to this particular driver.
74 * However some values must be preserved for the code (leveraged from serial.c
75 * to work correctly).
76 * port must not be 0
77 * type must not be UNKNOWN
78 * So I picked arbitrary (guess from where?) values instead
79 */
80static struct serial_state rs_table[NR_PORTS]={
81 /* UART CLK PORT IRQ FLAGS */
82 { 0, BASE_BAUD, 0x3F8, 0, STD_COM_FLAGS,0,PORT_16550 } /* ttyS0 */
83};
84
85/*
86 * Just for the fun of it !
87 */
88static struct serial_uart_config uart_config[] = {
89 { "unknown", 1, 0 },
90 { "8250", 1, 0 },
91 { "16450", 1, 0 },
92 { "16550", 1, 0 },
93 { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
94 { "cirrus", 1, 0 },
95 { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
96 { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
97 UART_STARTECH },
98 { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
99 { 0, 0}
100};
101
102struct tty_driver *hp_simserial_driver;
103
104static struct async_struct *IRQ_ports[NR_IRQS];
105
106static struct console *console;
107
108static unsigned char *tmp_buf;
109static DECLARE_MUTEX(tmp_buf_sem);
110
111extern struct console *console_drivers; /* from kernel/printk.c */
112
113/*
114 * ------------------------------------------------------------
115 * rs_stop() and rs_start()
116 *
117 * This routines are called before setting or resetting tty->stopped.
118 * They enable or disable transmitter interrupts, as necessary.
119 * ------------------------------------------------------------
120 */
121static void rs_stop(struct tty_struct *tty)
122{
123#ifdef SIMSERIAL_DEBUG
124 printk("rs_stop: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
125 tty->stopped, tty->hw_stopped, tty->flow_stopped);
126#endif
127
128}
129
130static void rs_start(struct tty_struct *tty)
131{
132#if SIMSERIAL_DEBUG
133 printk("rs_start: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
134 tty->stopped, tty->hw_stopped, tty->flow_stopped);
135#endif
136}
137
138static void receive_chars(struct tty_struct *tty, struct pt_regs *regs)
139{
140 unsigned char ch;
141 static unsigned char seen_esc = 0;
142
143 while ( (ch = ia64_ssc(0, 0, 0, 0, SSC_GETCHAR)) ) {
144 if ( ch == 27 && seen_esc == 0 ) {
145 seen_esc = 1;
146 continue;
147 } else {
148 if ( seen_esc==1 && ch == 'O' ) {
149 seen_esc = 2;
150 continue;
151 } else if ( seen_esc == 2 ) {
152 if ( ch == 'P' ) show_state(); /* F1 key */
153#ifdef CONFIG_KDB
154 if ( ch == 'S' )
155 kdb(KDB_REASON_KEYBOARD, 0, (kdb_eframe_t) regs);
156#endif
157
158 seen_esc = 0;
159 continue;
160 }
161 }
162 seen_esc = 0;
163 if (tty->flip.count >= TTY_FLIPBUF_SIZE) break;
164
165 *tty->flip.char_buf_ptr = ch;
166
167 *tty->flip.flag_buf_ptr = 0;
168
169 tty->flip.flag_buf_ptr++;
170 tty->flip.char_buf_ptr++;
171 tty->flip.count++;
172 }
173 tty_flip_buffer_push(tty);
174}
175
176/*
177 * This is the serial driver's interrupt routine for a single port
178 */
179static irqreturn_t rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
180{
181 struct async_struct * info;
182
183 /*
184 * I don't know exactly why they don't use the dev_id opaque data
185 * pointer instead of this extra lookup table
186 */
187 info = IRQ_ports[irq];
188 if (!info || !info->tty) {
189 printk(KERN_INFO "simrs_interrupt_single: info|tty=0 info=%p problem\n", info);
190 return IRQ_NONE;
191 }
192 /*
193 * pretty simple in our case, because we only get interrupts
194 * on inbound traffic
195 */
196 receive_chars(info->tty, regs);
197 return IRQ_HANDLED;
198}
199
200/*
201 * -------------------------------------------------------------------
202 * Here ends the serial interrupt routines.
203 * -------------------------------------------------------------------
204 */
205
206#if 0
207/*
208 * not really used in our situation so keep them commented out for now
209 */
210static DECLARE_TASK_QUEUE(tq_serial); /* used to be at the top of the file */
211static void do_serial_bh(void)
212{
213 run_task_queue(&tq_serial);
214 printk(KERN_ERR "do_serial_bh: called\n");
215}
216#endif
217
218static void do_softint(void *private_)
219{
220 printk(KERN_ERR "simserial: do_softint called\n");
221}
222
223static void rs_put_char(struct tty_struct *tty, unsigned char ch)
224{
225 struct async_struct *info = (struct async_struct *)tty->driver_data;
226 unsigned long flags;
227
228 if (!tty || !info->xmit.buf) return;
229
230 local_irq_save(flags);
231 if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) {
232 local_irq_restore(flags);
233 return;
234 }
235 info->xmit.buf[info->xmit.head] = ch;
236 info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1);
237 local_irq_restore(flags);
238}
239
240static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
241{
242 int count;
243 unsigned long flags;
244
245
246 local_irq_save(flags);
247
248 if (info->x_char) {
249 char c = info->x_char;
250
251 console->write(console, &c, 1);
252
253 info->state->icount.tx++;
254 info->x_char = 0;
255
256 goto out;
257 }
258
259 if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) {
260#ifdef SIMSERIAL_DEBUG
261 printk("transmit_chars: head=%d, tail=%d, stopped=%d\n",
262 info->xmit.head, info->xmit.tail, info->tty->stopped);
263#endif
264 goto out;
265 }
266 /*
267 * We removed the loop and try to do it in to chunks. We need
268 * 2 operations maximum because it's a ring buffer.
269 *
270 * First from current to tail if possible.
271 * Then from the beginning of the buffer until necessary
272 */
273
274 count = min(CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE),
275 SERIAL_XMIT_SIZE - info->xmit.tail);
276 console->write(console, info->xmit.buf+info->xmit.tail, count);
277
278 info->xmit.tail = (info->xmit.tail+count) & (SERIAL_XMIT_SIZE-1);
279
280 /*
281 * We have more at the beginning of the buffer
282 */
283 count = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
284 if (count) {
285 console->write(console, info->xmit.buf, count);
286 info->xmit.tail += count;
287 }
288out:
289 local_irq_restore(flags);
290}
291
292static void rs_flush_chars(struct tty_struct *tty)
293{
294 struct async_struct *info = (struct async_struct *)tty->driver_data;
295
296 if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped ||
297 !info->xmit.buf)
298 return;
299
300 transmit_chars(info, NULL);
301}
302
303
304static int rs_write(struct tty_struct * tty,
305 const unsigned char *buf, int count)
306{
307 int c, ret = 0;
308 struct async_struct *info = (struct async_struct *)tty->driver_data;
309 unsigned long flags;
310
311 if (!tty || !info->xmit.buf || !tmp_buf) return 0;
312
313 local_irq_save(flags);
314 while (1) {
315 c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
316 if (count < c)
317 c = count;
318 if (c <= 0) {
319 break;
320 }
321 memcpy(info->xmit.buf + info->xmit.head, buf, c);
322 info->xmit.head = ((info->xmit.head + c) &
323 (SERIAL_XMIT_SIZE-1));
324 buf += c;
325 count -= c;
326 ret += c;
327 }
328 local_irq_restore(flags);
329 /*
330 * Hey, we transmit directly from here in our case
331 */
332 if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE)
333 && !tty->stopped && !tty->hw_stopped) {
334 transmit_chars(info, NULL);
335 }
336 return ret;
337}
338
339static int rs_write_room(struct tty_struct *tty)
340{
341 struct async_struct *info = (struct async_struct *)tty->driver_data;
342
343 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
344}
345
346static int rs_chars_in_buffer(struct tty_struct *tty)
347{
348 struct async_struct *info = (struct async_struct *)tty->driver_data;
349
350 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
351}
352
353static void rs_flush_buffer(struct tty_struct *tty)
354{
355 struct async_struct *info = (struct async_struct *)tty->driver_data;
356 unsigned long flags;
357
358 local_irq_save(flags);
359 info->xmit.head = info->xmit.tail = 0;
360 local_irq_restore(flags);
361
362 wake_up_interruptible(&tty->write_wait);
363
364 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
365 tty->ldisc.write_wakeup)
366 (tty->ldisc.write_wakeup)(tty);
367}
368
369/*
370 * This function is used to send a high-priority XON/XOFF character to
371 * the device
372 */
373static void rs_send_xchar(struct tty_struct *tty, char ch)
374{
375 struct async_struct *info = (struct async_struct *)tty->driver_data;
376
377 info->x_char = ch;
378 if (ch) {
379 /*
380 * I guess we could call console->write() directly but
381 * let's do that for now.
382 */
383 transmit_chars(info, NULL);
384 }
385}
386
387/*
388 * ------------------------------------------------------------
389 * rs_throttle()
390 *
391 * This routine is called by the upper-layer tty layer to signal that
392 * incoming characters should be throttled.
393 * ------------------------------------------------------------
394 */
395static void rs_throttle(struct tty_struct * tty)
396{
397 if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty));
398
399 printk(KERN_INFO "simrs_throttle called\n");
400}
401
402static void rs_unthrottle(struct tty_struct * tty)
403{
404 struct async_struct *info = (struct async_struct *)tty->driver_data;
405
406 if (I_IXOFF(tty)) {
407 if (info->x_char)
408 info->x_char = 0;
409 else
410 rs_send_xchar(tty, START_CHAR(tty));
411 }
412 printk(KERN_INFO "simrs_unthrottle called\n");
413}
414
415/*
416 * rs_break() --- routine which turns the break handling on or off
417 */
418static void rs_break(struct tty_struct *tty, int break_state)
419{
420}
421
422static int rs_ioctl(struct tty_struct *tty, struct file * file,
423 unsigned int cmd, unsigned long arg)
424{
425 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
426 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
427 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
428 if (tty->flags & (1 << TTY_IO_ERROR))
429 return -EIO;
430 }
431
432 switch (cmd) {
433 case TIOCMGET:
434 printk(KERN_INFO "rs_ioctl: TIOCMGET called\n");
435 return -EINVAL;
436 case TIOCMBIS:
437 case TIOCMBIC:
438 case TIOCMSET:
439 printk(KERN_INFO "rs_ioctl: TIOCMBIS/BIC/SET called\n");
440 return -EINVAL;
441 case TIOCGSERIAL:
442 printk(KERN_INFO "simrs_ioctl TIOCGSERIAL called\n");
443 return 0;
444 case TIOCSSERIAL:
445 printk(KERN_INFO "simrs_ioctl TIOCSSERIAL called\n");
446 return 0;
447 case TIOCSERCONFIG:
448 printk(KERN_INFO "rs_ioctl: TIOCSERCONFIG called\n");
449 return -EINVAL;
450
451 case TIOCSERGETLSR: /* Get line status register */
452 printk(KERN_INFO "rs_ioctl: TIOCSERGETLSR called\n");
453 return -EINVAL;
454
455 case TIOCSERGSTRUCT:
456 printk(KERN_INFO "rs_ioctl: TIOCSERGSTRUCT called\n");
457#if 0
458 if (copy_to_user((struct async_struct *) arg,
459 info, sizeof(struct async_struct)))
460 return -EFAULT;
461#endif
462 return 0;
463
464 /*
465 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
466 * - mask passed in arg for lines of interest
467 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
468 * Caller should use TIOCGICOUNT to see which one it was
469 */
470 case TIOCMIWAIT:
471 printk(KERN_INFO "rs_ioctl: TIOCMIWAIT: called\n");
472 return 0;
473 /*
474 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
475 * Return: write counters to the user passed counter struct
476 * NB: both 1->0 and 0->1 transitions are counted except for
477 * RI where only 0->1 is counted.
478 */
479 case TIOCGICOUNT:
480 printk(KERN_INFO "rs_ioctl: TIOCGICOUNT called\n");
481 return 0;
482
483 case TIOCSERGWILD:
484 case TIOCSERSWILD:
485 /* "setserial -W" is called in Debian boot */
486 printk (KERN_INFO "TIOCSER?WILD ioctl obsolete, ignored.\n");
487 return 0;
488
489 default:
490 return -ENOIOCTLCMD;
491 }
492 return 0;
493}
494
495#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
496
497static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
498{
499 unsigned int cflag = tty->termios->c_cflag;
500
501 if ( (cflag == old_termios->c_cflag)
502 && ( RELEVANT_IFLAG(tty->termios->c_iflag)
503 == RELEVANT_IFLAG(old_termios->c_iflag)))
504 return;
505
506
507 /* Handle turning off CRTSCTS */
508 if ((old_termios->c_cflag & CRTSCTS) &&
509 !(tty->termios->c_cflag & CRTSCTS)) {
510 tty->hw_stopped = 0;
511 rs_start(tty);
512 }
513}
514/*
515 * This routine will shutdown a serial port; interrupts are disabled, and
516 * DTR is dropped if the hangup on close termio flag is on.
517 */
518static void shutdown(struct async_struct * info)
519{
520 unsigned long flags;
521 struct serial_state *state;
522 int retval;
523
524 if (!(info->flags & ASYNC_INITIALIZED)) return;
525
526 state = info->state;
527
528#ifdef SIMSERIAL_DEBUG
529 printk("Shutting down serial port %d (irq %d)....", info->line,
530 state->irq);
531#endif
532
533 local_irq_save(flags);
534 {
535 /*
536 * First unlink the serial port from the IRQ chain...
537 */
538 if (info->next_port)
539 info->next_port->prev_port = info->prev_port;
540 if (info->prev_port)
541 info->prev_port->next_port = info->next_port;
542 else
543 IRQ_ports[state->irq] = info->next_port;
544
545 /*
546 * Free the IRQ, if necessary
547 */
548 if (state->irq && (!IRQ_ports[state->irq] ||
549 !IRQ_ports[state->irq]->next_port)) {
550 if (IRQ_ports[state->irq]) {
551 free_irq(state->irq, NULL);
552 retval = request_irq(state->irq, rs_interrupt_single,
553 IRQ_T(info), "serial", NULL);
554
555 if (retval)
556 printk(KERN_ERR "serial shutdown: request_irq: error %d"
557 " Couldn't reacquire IRQ.\n", retval);
558 } else
559 free_irq(state->irq, NULL);
560 }
561
562 if (info->xmit.buf) {
563 free_page((unsigned long) info->xmit.buf);
564 info->xmit.buf = 0;
565 }
566
567 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
568
569 info->flags &= ~ASYNC_INITIALIZED;
570 }
571 local_irq_restore(flags);
572}
573
574/*
575 * ------------------------------------------------------------
576 * rs_close()
577 *
578 * This routine is called when the serial port gets closed. First, we
579 * wait for the last remaining data to be sent. Then, we unlink its
580 * async structure from the interrupt chain if necessary, and we free
581 * that IRQ if nothing is left in the chain.
582 * ------------------------------------------------------------
583 */
584static void rs_close(struct tty_struct *tty, struct file * filp)
585{
586 struct async_struct * info = (struct async_struct *)tty->driver_data;
587 struct serial_state *state;
588 unsigned long flags;
589
590 if (!info ) return;
591
592 state = info->state;
593
594 local_irq_save(flags);
595 if (tty_hung_up_p(filp)) {
596#ifdef SIMSERIAL_DEBUG
597 printk("rs_close: hung_up\n");
598#endif
599 local_irq_restore(flags);
600 return;
601 }
602#ifdef SIMSERIAL_DEBUG
603 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
604#endif
605 if ((tty->count == 1) && (state->count != 1)) {
606 /*
607 * Uh, oh. tty->count is 1, which means that the tty
608 * structure will be freed. state->count should always
609 * be one in these conditions. If it's greater than
610 * one, we've got real problems, since it means the
611 * serial port won't be shutdown.
612 */
613 printk(KERN_ERR "rs_close: bad serial port count; tty->count is 1, "
614 "state->count is %d\n", state->count);
615 state->count = 1;
616 }
617 if (--state->count < 0) {
618 printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
619 info->line, state->count);
620 state->count = 0;
621 }
622 if (state->count) {
623 local_irq_restore(flags);
624 return;
625 }
626 info->flags |= ASYNC_CLOSING;
627 local_irq_restore(flags);
628
629 /*
630 * Now we wait for the transmit buffer to clear; and we notify
631 * the line discipline to only process XON/XOFF characters.
632 */
633 shutdown(info);
634 if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty);
635 if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty);
636 info->event = 0;
637 info->tty = 0;
638 if (info->blocked_open) {
639 if (info->close_delay) {
640 current->state = TASK_INTERRUPTIBLE;
641 schedule_timeout(info->close_delay);
642 }
643 wake_up_interruptible(&info->open_wait);
644 }
645 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
646 wake_up_interruptible(&info->close_wait);
647}
648
649/*
650 * rs_wait_until_sent() --- wait until the transmitter is empty
651 */
652static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
653{
654}
655
656
657/*
658 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
659 */
660static void rs_hangup(struct tty_struct *tty)
661{
662 struct async_struct * info = (struct async_struct *)tty->driver_data;
663 struct serial_state *state = info->state;
664
665#ifdef SIMSERIAL_DEBUG
666 printk("rs_hangup: called\n");
667#endif
668
669 state = info->state;
670
671 rs_flush_buffer(tty);
672 if (info->flags & ASYNC_CLOSING)
673 return;
674 shutdown(info);
675
676 info->event = 0;
677 state->count = 0;
678 info->flags &= ~ASYNC_NORMAL_ACTIVE;
679 info->tty = 0;
680 wake_up_interruptible(&info->open_wait);
681}
682
683
684static int get_async_struct(int line, struct async_struct **ret_info)
685{
686 struct async_struct *info;
687 struct serial_state *sstate;
688
689 sstate = rs_table + line;
690 sstate->count++;
691 if (sstate->info) {
692 *ret_info = sstate->info;
693 return 0;
694 }
695 info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
696 if (!info) {
697 sstate->count--;
698 return -ENOMEM;
699 }
700 memset(info, 0, sizeof(struct async_struct));
701 init_waitqueue_head(&info->open_wait);
702 init_waitqueue_head(&info->close_wait);
703 init_waitqueue_head(&info->delta_msr_wait);
704 info->magic = SERIAL_MAGIC;
705 info->port = sstate->port;
706 info->flags = sstate->flags;
707 info->xmit_fifo_size = sstate->xmit_fifo_size;
708 info->line = line;
709 INIT_WORK(&info->work, do_softint, info);
710 info->state = sstate;
711 if (sstate->info) {
712 kfree(info);
713 *ret_info = sstate->info;
714 return 0;
715 }
716 *ret_info = sstate->info = info;
717 return 0;
718}
719
720static int
721startup(struct async_struct *info)
722{
723 unsigned long flags;
724 int retval=0;
725 irqreturn_t (*handler)(int, void *, struct pt_regs *);
726 struct serial_state *state= info->state;
727 unsigned long page;
728
729 page = get_zeroed_page(GFP_KERNEL);
730 if (!page)
731 return -ENOMEM;
732
733 local_irq_save(flags);
734
735 if (info->flags & ASYNC_INITIALIZED) {
736 free_page(page);
737 goto errout;
738 }
739
740 if (!state->port || !state->type) {
741 if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
742 free_page(page);
743 goto errout;
744 }
745 if (info->xmit.buf)
746 free_page(page);
747 else
748 info->xmit.buf = (unsigned char *) page;
749
750#ifdef SIMSERIAL_DEBUG
751 printk("startup: ttys%d (irq %d)...", info->line, state->irq);
752#endif
753
754 /*
755 * Allocate the IRQ if necessary
756 */
757 if (state->irq && (!IRQ_ports[state->irq] ||
758 !IRQ_ports[state->irq]->next_port)) {
759 if (IRQ_ports[state->irq]) {
760 retval = -EBUSY;
761 goto errout;
762 } else
763 handler = rs_interrupt_single;
764
765 retval = request_irq(state->irq, handler, IRQ_T(info), "simserial", NULL);
766 if (retval) {
767 if (capable(CAP_SYS_ADMIN)) {
768 if (info->tty)
769 set_bit(TTY_IO_ERROR,
770 &info->tty->flags);
771 retval = 0;
772 }
773 goto errout;
774 }
775 }
776
777 /*
778 * Insert serial port into IRQ chain.
779 */
780 info->prev_port = 0;
781 info->next_port = IRQ_ports[state->irq];
782 if (info->next_port)
783 info->next_port->prev_port = info;
784 IRQ_ports[state->irq] = info;
785
786 if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags);
787
788 info->xmit.head = info->xmit.tail = 0;
789
790#if 0
791 /*
792 * Set up serial timers...
793 */
794 timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
795 timer_active |= 1 << RS_TIMER;
796#endif
797
798 /*
799 * Set up the tty->alt_speed kludge
800 */
801 if (info->tty) {
802 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
803 info->tty->alt_speed = 57600;
804 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
805 info->tty->alt_speed = 115200;
806 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
807 info->tty->alt_speed = 230400;
808 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
809 info->tty->alt_speed = 460800;
810 }
811
812 info->flags |= ASYNC_INITIALIZED;
813 local_irq_restore(flags);
814 return 0;
815
816errout:
817 local_irq_restore(flags);
818 return retval;
819}
820
821
822/*
823 * This routine is called whenever a serial port is opened. It
824 * enables interrupts for a serial port, linking in its async structure into
825 * the IRQ chain. It also performs the serial-specific
826 * initialization for the tty structure.
827 */
828static int rs_open(struct tty_struct *tty, struct file * filp)
829{
830 struct async_struct *info;
831 int retval, line;
832 unsigned long page;
833
834 line = tty->index;
835 if ((line < 0) || (line >= NR_PORTS))
836 return -ENODEV;
837 retval = get_async_struct(line, &info);
838 if (retval)
839 return retval;
840 tty->driver_data = info;
841 info->tty = tty;
842
843#ifdef SIMSERIAL_DEBUG
844 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
845#endif
846 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
847
848 if (!tmp_buf) {
849 page = get_zeroed_page(GFP_KERNEL);
850 if (!page)
851 return -ENOMEM;
852 if (tmp_buf)
853 free_page(page);
854 else
855 tmp_buf = (unsigned char *) page;
856 }
857
858 /*
859 * If the port is the middle of closing, bail out now
860 */
861 if (tty_hung_up_p(filp) ||
862 (info->flags & ASYNC_CLOSING)) {
863 if (info->flags & ASYNC_CLOSING)
864 interruptible_sleep_on(&info->close_wait);
865#ifdef SERIAL_DO_RESTART
866 return ((info->flags & ASYNC_HUP_NOTIFY) ?
867 -EAGAIN : -ERESTARTSYS);
868#else
869 return -EAGAIN;
870#endif
871 }
872
873 /*
874 * Start up serial port
875 */
876 retval = startup(info);
877 if (retval) {
878 return retval;
879 }
880
881 /*
882 * figure out which console to use (should be one already)
883 */
884 console = console_drivers;
885 while (console) {
886 if ((console->flags & CON_ENABLED) && console->write) break;
887 console = console->next;
888 }
889
890#ifdef SIMSERIAL_DEBUG
891 printk("rs_open ttys%d successful\n", info->line);
892#endif
893 return 0;
894}
895
896/*
897 * /proc fs routines....
898 */
899
900static inline int line_info(char *buf, struct serial_state *state)
901{
902 return sprintf(buf, "%d: uart:%s port:%lX irq:%d\n",
903 state->line, uart_config[state->type].name,
904 state->port, state->irq);
905}
906
907static int rs_read_proc(char *page, char **start, off_t off, int count,
908 int *eof, void *data)
909{
910 int i, len = 0, l;
911 off_t begin = 0;
912
913 len += sprintf(page, "simserinfo:1.0 driver:%s\n", serial_version);
914 for (i = 0; i < NR_PORTS && len < 4000; i++) {
915 l = line_info(page + len, &rs_table[i]);
916 len += l;
917 if (len+begin > off+count)
918 goto done;
919 if (len+begin < off) {
920 begin += len;
921 len = 0;
922 }
923 }
924 *eof = 1;
925done:
926 if (off >= len+begin)
927 return 0;
928 *start = page + (begin-off);
929 return ((count < begin+len-off) ? count : begin+len-off);
930}
931
932/*
933 * ---------------------------------------------------------------------
934 * rs_init() and friends
935 *
936 * rs_init() is called at boot-time to initialize the serial driver.
937 * ---------------------------------------------------------------------
938 */
939
940/*
941 * This routine prints out the appropriate serial driver version
942 * number, and identifies which options were configured into this
943 * driver.
944 */
945static inline void show_serial_version(void)
946{
947 printk(KERN_INFO "%s version %s with", serial_name, serial_version);
948 printk(KERN_INFO " no serial options enabled\n");
949}
950
951static struct tty_operations hp_ops = {
952 .open = rs_open,
953 .close = rs_close,
954 .write = rs_write,
955 .put_char = rs_put_char,
956 .flush_chars = rs_flush_chars,
957 .write_room = rs_write_room,
958 .chars_in_buffer = rs_chars_in_buffer,
959 .flush_buffer = rs_flush_buffer,
960 .ioctl = rs_ioctl,
961 .throttle = rs_throttle,
962 .unthrottle = rs_unthrottle,
963 .send_xchar = rs_send_xchar,
964 .set_termios = rs_set_termios,
965 .stop = rs_stop,
966 .start = rs_start,
967 .hangup = rs_hangup,
968 .break_ctl = rs_break,
969 .wait_until_sent = rs_wait_until_sent,
970 .read_proc = rs_read_proc,
971};
972
973/*
974 * The serial driver boot-time initialization code!
975 */
976static int __init
977simrs_init (void)
978{
979 int i;
980 struct serial_state *state;
981
982 if (!ia64_platform_is("hpsim"))
983 return -ENODEV;
984
985 hp_simserial_driver = alloc_tty_driver(1);
986 if (!hp_simserial_driver)
987 return -ENOMEM;
988
989 show_serial_version();
990
991 /* Initialize the tty_driver structure */
992
993 hp_simserial_driver->owner = THIS_MODULE;
994 hp_simserial_driver->driver_name = "simserial";
995 hp_simserial_driver->name = "ttyS";
996 hp_simserial_driver->major = TTY_MAJOR;
997 hp_simserial_driver->minor_start = 64;
998 hp_simserial_driver->type = TTY_DRIVER_TYPE_SERIAL;
999 hp_simserial_driver->subtype = SERIAL_TYPE_NORMAL;
1000 hp_simserial_driver->init_termios = tty_std_termios;
1001 hp_simserial_driver->init_termios.c_cflag =
1002 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1003 hp_simserial_driver->flags = TTY_DRIVER_REAL_RAW;
1004 tty_set_operations(hp_simserial_driver, &hp_ops);
1005
1006 /*
1007 * Let's have a little bit of fun !
1008 */
1009 for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
1010
1011 if (state->type == PORT_UNKNOWN) continue;
1012
1013 if (!state->irq) {
1014 state->irq = assign_irq_vector(AUTO_ASSIGN);
1015 ia64_ssc_connect_irq(KEYBOARD_INTR, state->irq);
1016 }
1017
1018 printk(KERN_INFO "ttyS%d at 0x%04lx (irq = %d) is a %s\n",
1019 state->line,
1020 state->port, state->irq,
1021 uart_config[state->type].name);
1022 }
1023
1024 if (tty_register_driver(hp_simserial_driver))
1025 panic("Couldn't register simserial driver\n");
1026
1027 return 0;
1028}
1029
1030#ifndef MODULE
1031__initcall(simrs_init);
1032#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-23 23:38:33 -0500