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1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
a9415644 | 28 | #include <linux/capability.h> |
1da177e4 LT |
29 | #include <linux/console.h> |
30 | #include <linux/module.h> | |
31 | #include <linux/serial.h> | |
32 | #include <linux/serialP.h> | |
819c67e6 | 33 | #include <linux/sysrq.h> |
1da177e4 LT |
34 | |
35 | #include <asm/irq.h> | |
36 | #include <asm/hw_irq.h> | |
37 | #include <asm/uaccess.h> | |
38 | ||
1da177e4 LT |
39 | #undef SIMSERIAL_DEBUG /* define this to get some debug information */ |
40 | ||
41 | #define KEYBOARD_INTR 3 /* must match with simulator! */ | |
42 | ||
43 | #define NR_PORTS 1 /* only one port for now */ | |
1da177e4 | 44 | |
121a4226 | 45 | #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED : IRQF_DISABLED) |
1da177e4 LT |
46 | |
47 | #define SSC_GETCHAR 21 | |
48 | ||
49 | extern long ia64_ssc (long, long, long, long, int); | |
50 | extern void ia64_ssc_connect_irq (long intr, long irq); | |
51 | ||
52 | static char *serial_name = "SimSerial driver"; | |
53 | static char *serial_version = "0.6"; | |
54 | ||
55 | /* | |
56 | * This has been extracted from asm/serial.h. We need one eventually but | |
57 | * I don't know exactly what we're going to put in it so just fake one | |
58 | * for now. | |
59 | */ | |
60 | #define BASE_BAUD ( 1843200 / 16 ) | |
61 | ||
62 | #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST) | |
63 | ||
64 | /* | |
65 | * Most of the values here are meaningless to this particular driver. | |
66 | * However some values must be preserved for the code (leveraged from serial.c | |
67 | * to work correctly). | |
68 | * port must not be 0 | |
69 | * type must not be UNKNOWN | |
70 | * So I picked arbitrary (guess from where?) values instead | |
71 | */ | |
72 | static struct serial_state rs_table[NR_PORTS]={ | |
73 | /* UART CLK PORT IRQ FLAGS */ | |
74 | { 0, BASE_BAUD, 0x3F8, 0, STD_COM_FLAGS,0,PORT_16550 } /* ttyS0 */ | |
75 | }; | |
76 | ||
77 | /* | |
78 | * Just for the fun of it ! | |
79 | */ | |
80 | static struct serial_uart_config uart_config[] = { | |
81 | { "unknown", 1, 0 }, | |
82 | { "8250", 1, 0 }, | |
83 | { "16450", 1, 0 }, | |
84 | { "16550", 1, 0 }, | |
85 | { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO }, | |
86 | { "cirrus", 1, 0 }, | |
87 | { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH }, | |
88 | { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO | | |
89 | UART_STARTECH }, | |
90 | { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO}, | |
cfa7fd72 | 91 | { NULL, 0} |
1da177e4 LT |
92 | }; |
93 | ||
94 | struct tty_driver *hp_simserial_driver; | |
95 | ||
96 | static struct async_struct *IRQ_ports[NR_IRQS]; | |
97 | ||
98 | static struct console *console; | |
99 | ||
100 | static unsigned char *tmp_buf; | |
1da177e4 LT |
101 | |
102 | extern struct console *console_drivers; /* from kernel/printk.c */ | |
103 | ||
104 | /* | |
105 | * ------------------------------------------------------------ | |
106 | * rs_stop() and rs_start() | |
107 | * | |
108 | * This routines are called before setting or resetting tty->stopped. | |
109 | * They enable or disable transmitter interrupts, as necessary. | |
110 | * ------------------------------------------------------------ | |
111 | */ | |
112 | static void rs_stop(struct tty_struct *tty) | |
113 | { | |
114 | #ifdef SIMSERIAL_DEBUG | |
115 | printk("rs_stop: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n", | |
116 | tty->stopped, tty->hw_stopped, tty->flow_stopped); | |
117 | #endif | |
118 | ||
119 | } | |
120 | ||
121 | static void rs_start(struct tty_struct *tty) | |
122 | { | |
e72225d1 | 123 | #ifdef SIMSERIAL_DEBUG |
1da177e4 LT |
124 | printk("rs_start: 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 | ||
5dcded1b | 129 | static void receive_chars(struct tty_struct *tty) |
1da177e4 LT |
130 | { |
131 | unsigned char ch; | |
132 | static unsigned char seen_esc = 0; | |
133 | ||
134 | while ( (ch = ia64_ssc(0, 0, 0, 0, SSC_GETCHAR)) ) { | |
135 | if ( ch == 27 && seen_esc == 0 ) { | |
136 | seen_esc = 1; | |
137 | continue; | |
138 | } else { | |
139 | if ( seen_esc==1 && ch == 'O' ) { | |
140 | seen_esc = 2; | |
141 | continue; | |
142 | } else if ( seen_esc == 2 ) { | |
819c67e6 DMT |
143 | if ( ch == 'P' ) /* F1 */ |
144 | show_state(); | |
145 | #ifdef CONFIG_MAGIC_SYSRQ | |
146 | if ( ch == 'S' ) { /* F4 */ | |
147 | do | |
148 | ch = ia64_ssc(0, 0, 0, 0, | |
149 | SSC_GETCHAR); | |
150 | while (!ch); | |
5dcded1b | 151 | handle_sysrq(ch, NULL); |
819c67e6 | 152 | } |
1da177e4 | 153 | #endif |
1da177e4 LT |
154 | seen_esc = 0; |
155 | continue; | |
156 | } | |
157 | } | |
158 | seen_esc = 0; | |
1da177e4 | 159 | |
d50f5c5c AS |
160 | if (tty_insert_flip_char(tty, ch, TTY_NORMAL) == 0) |
161 | break; | |
1da177e4 LT |
162 | } |
163 | tty_flip_buffer_push(tty); | |
164 | } | |
165 | ||
166 | /* | |
167 | * This is the serial driver's interrupt routine for a single port | |
168 | */ | |
5dcded1b | 169 | static irqreturn_t rs_interrupt_single(int irq, void *dev_id) |
1da177e4 LT |
170 | { |
171 | struct async_struct * info; | |
172 | ||
173 | /* | |
174 | * I don't know exactly why they don't use the dev_id opaque data | |
175 | * pointer instead of this extra lookup table | |
176 | */ | |
177 | info = IRQ_ports[irq]; | |
178 | if (!info || !info->tty) { | |
179 | printk(KERN_INFO "simrs_interrupt_single: info|tty=0 info=%p problem\n", info); | |
180 | return IRQ_NONE; | |
181 | } | |
182 | /* | |
183 | * pretty simple in our case, because we only get interrupts | |
184 | * on inbound traffic | |
185 | */ | |
5dcded1b | 186 | receive_chars(info->tty); |
1da177e4 LT |
187 | return IRQ_HANDLED; |
188 | } | |
189 | ||
190 | /* | |
191 | * ------------------------------------------------------------------- | |
192 | * Here ends the serial interrupt routines. | |
193 | * ------------------------------------------------------------------- | |
194 | */ | |
195 | ||
196 | #if 0 | |
197 | /* | |
198 | * not really used in our situation so keep them commented out for now | |
199 | */ | |
200 | static DECLARE_TASK_QUEUE(tq_serial); /* used to be at the top of the file */ | |
201 | static void do_serial_bh(void) | |
202 | { | |
203 | run_task_queue(&tq_serial); | |
204 | printk(KERN_ERR "do_serial_bh: called\n"); | |
205 | } | |
206 | #endif | |
207 | ||
6d5aefb8 | 208 | static void do_softint(struct work_struct *private_) |
1da177e4 LT |
209 | { |
210 | printk(KERN_ERR "simserial: do_softint called\n"); | |
211 | } | |
212 | ||
f34d7a5b | 213 | static int rs_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 LT |
214 | { |
215 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
216 | unsigned long flags; | |
217 | ||
f34d7a5b AC |
218 | if (!tty || !info->xmit.buf) |
219 | return 0; | |
1da177e4 LT |
220 | |
221 | local_irq_save(flags); | |
222 | if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) == 0) { | |
223 | local_irq_restore(flags); | |
f34d7a5b | 224 | return 0; |
1da177e4 LT |
225 | } |
226 | info->xmit.buf[info->xmit.head] = ch; | |
227 | info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1); | |
228 | local_irq_restore(flags); | |
f34d7a5b | 229 | return 1; |
1da177e4 LT |
230 | } |
231 | ||
41c28ff1 | 232 | static void transmit_chars(struct async_struct *info, int *intr_done) |
1da177e4 LT |
233 | { |
234 | int count; | |
235 | unsigned long flags; | |
236 | ||
237 | ||
238 | local_irq_save(flags); | |
239 | ||
240 | if (info->x_char) { | |
241 | char c = info->x_char; | |
242 | ||
243 | console->write(console, &c, 1); | |
244 | ||
245 | info->state->icount.tx++; | |
246 | info->x_char = 0; | |
247 | ||
248 | goto out; | |
249 | } | |
250 | ||
251 | if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) { | |
252 | #ifdef SIMSERIAL_DEBUG | |
253 | printk("transmit_chars: head=%d, tail=%d, stopped=%d\n", | |
254 | info->xmit.head, info->xmit.tail, info->tty->stopped); | |
255 | #endif | |
256 | goto out; | |
257 | } | |
258 | /* | |
259 | * We removed the loop and try to do it in to chunks. We need | |
260 | * 2 operations maximum because it's a ring buffer. | |
261 | * | |
262 | * First from current to tail if possible. | |
263 | * Then from the beginning of the buffer until necessary | |
264 | */ | |
265 | ||
266 | count = min(CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE), | |
267 | SERIAL_XMIT_SIZE - info->xmit.tail); | |
268 | console->write(console, info->xmit.buf+info->xmit.tail, count); | |
269 | ||
270 | info->xmit.tail = (info->xmit.tail+count) & (SERIAL_XMIT_SIZE-1); | |
271 | ||
272 | /* | |
273 | * We have more at the beginning of the buffer | |
274 | */ | |
275 | count = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
276 | if (count) { | |
277 | console->write(console, info->xmit.buf, count); | |
278 | info->xmit.tail += count; | |
279 | } | |
280 | out: | |
281 | local_irq_restore(flags); | |
282 | } | |
283 | ||
284 | static void rs_flush_chars(struct tty_struct *tty) | |
285 | { | |
286 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
287 | ||
288 | if (info->xmit.head == info->xmit.tail || tty->stopped || tty->hw_stopped || | |
289 | !info->xmit.buf) | |
290 | return; | |
291 | ||
292 | transmit_chars(info, NULL); | |
293 | } | |
294 | ||
295 | ||
296 | static int rs_write(struct tty_struct * tty, | |
297 | const unsigned char *buf, int count) | |
298 | { | |
299 | int c, ret = 0; | |
300 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
301 | unsigned long flags; | |
302 | ||
303 | if (!tty || !info->xmit.buf || !tmp_buf) return 0; | |
304 | ||
305 | local_irq_save(flags); | |
306 | while (1) { | |
307 | c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
308 | if (count < c) | |
309 | c = count; | |
310 | if (c <= 0) { | |
311 | break; | |
312 | } | |
313 | memcpy(info->xmit.buf + info->xmit.head, buf, c); | |
314 | info->xmit.head = ((info->xmit.head + c) & | |
315 | (SERIAL_XMIT_SIZE-1)); | |
316 | buf += c; | |
317 | count -= c; | |
318 | ret += c; | |
319 | } | |
320 | local_irq_restore(flags); | |
321 | /* | |
322 | * Hey, we transmit directly from here in our case | |
323 | */ | |
324 | if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE) | |
325 | && !tty->stopped && !tty->hw_stopped) { | |
326 | transmit_chars(info, NULL); | |
327 | } | |
328 | return ret; | |
329 | } | |
330 | ||
331 | static int rs_write_room(struct tty_struct *tty) | |
332 | { | |
333 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
334 | ||
335 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
336 | } | |
337 | ||
338 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
339 | { | |
340 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
341 | ||
342 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
343 | } | |
344 | ||
345 | static void rs_flush_buffer(struct tty_struct *tty) | |
346 | { | |
347 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
348 | unsigned long flags; | |
349 | ||
350 | local_irq_save(flags); | |
351 | info->xmit.head = info->xmit.tail = 0; | |
352 | local_irq_restore(flags); | |
353 | ||
354 | wake_up_interruptible(&tty->write_wait); | |
355 | ||
356 | if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && | |
357 | tty->ldisc.write_wakeup) | |
358 | (tty->ldisc.write_wakeup)(tty); | |
359 | } | |
360 | ||
361 | /* | |
362 | * This function is used to send a high-priority XON/XOFF character to | |
363 | * the device | |
364 | */ | |
365 | static void rs_send_xchar(struct tty_struct *tty, char ch) | |
366 | { | |
367 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
368 | ||
369 | info->x_char = ch; | |
370 | if (ch) { | |
371 | /* | |
372 | * I guess we could call console->write() directly but | |
373 | * let's do that for now. | |
374 | */ | |
375 | transmit_chars(info, NULL); | |
376 | } | |
377 | } | |
378 | ||
379 | /* | |
380 | * ------------------------------------------------------------ | |
381 | * rs_throttle() | |
382 | * | |
383 | * This routine is called by the upper-layer tty layer to signal that | |
384 | * incoming characters should be throttled. | |
385 | * ------------------------------------------------------------ | |
386 | */ | |
387 | static void rs_throttle(struct tty_struct * tty) | |
388 | { | |
389 | if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty)); | |
390 | ||
391 | printk(KERN_INFO "simrs_throttle called\n"); | |
392 | } | |
393 | ||
394 | static void rs_unthrottle(struct tty_struct * tty) | |
395 | { | |
396 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
397 | ||
398 | if (I_IXOFF(tty)) { | |
399 | if (info->x_char) | |
400 | info->x_char = 0; | |
401 | else | |
402 | rs_send_xchar(tty, START_CHAR(tty)); | |
403 | } | |
404 | printk(KERN_INFO "simrs_unthrottle called\n"); | |
405 | } | |
406 | ||
407 | /* | |
408 | * rs_break() --- routine which turns the break handling on or off | |
409 | */ | |
410 | static void rs_break(struct tty_struct *tty, int break_state) | |
411 | { | |
412 | } | |
413 | ||
414 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
415 | unsigned int cmd, unsigned long arg) | |
416 | { | |
417 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
418 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && | |
419 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { | |
420 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
421 | return -EIO; | |
422 | } | |
423 | ||
424 | switch (cmd) { | |
425 | case TIOCMGET: | |
426 | printk(KERN_INFO "rs_ioctl: TIOCMGET called\n"); | |
427 | return -EINVAL; | |
428 | case TIOCMBIS: | |
429 | case TIOCMBIC: | |
430 | case TIOCMSET: | |
431 | printk(KERN_INFO "rs_ioctl: TIOCMBIS/BIC/SET called\n"); | |
432 | return -EINVAL; | |
433 | case TIOCGSERIAL: | |
434 | printk(KERN_INFO "simrs_ioctl TIOCGSERIAL called\n"); | |
435 | return 0; | |
436 | case TIOCSSERIAL: | |
437 | printk(KERN_INFO "simrs_ioctl TIOCSSERIAL called\n"); | |
438 | return 0; | |
439 | case TIOCSERCONFIG: | |
440 | printk(KERN_INFO "rs_ioctl: TIOCSERCONFIG called\n"); | |
441 | return -EINVAL; | |
442 | ||
443 | case TIOCSERGETLSR: /* Get line status register */ | |
444 | printk(KERN_INFO "rs_ioctl: TIOCSERGETLSR called\n"); | |
445 | return -EINVAL; | |
446 | ||
447 | case TIOCSERGSTRUCT: | |
448 | printk(KERN_INFO "rs_ioctl: TIOCSERGSTRUCT called\n"); | |
449 | #if 0 | |
450 | if (copy_to_user((struct async_struct *) arg, | |
451 | info, sizeof(struct async_struct))) | |
452 | return -EFAULT; | |
453 | #endif | |
454 | return 0; | |
455 | ||
456 | /* | |
457 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
458 | * - mask passed in arg for lines of interest | |
459 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
460 | * Caller should use TIOCGICOUNT to see which one it was | |
461 | */ | |
462 | case TIOCMIWAIT: | |
463 | printk(KERN_INFO "rs_ioctl: TIOCMIWAIT: called\n"); | |
464 | return 0; | |
465 | /* | |
466 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
467 | * Return: write counters to the user passed counter struct | |
468 | * NB: both 1->0 and 0->1 transitions are counted except for | |
469 | * RI where only 0->1 is counted. | |
470 | */ | |
471 | case TIOCGICOUNT: | |
472 | printk(KERN_INFO "rs_ioctl: TIOCGICOUNT called\n"); | |
473 | return 0; | |
474 | ||
475 | case TIOCSERGWILD: | |
476 | case TIOCSERSWILD: | |
477 | /* "setserial -W" is called in Debian boot */ | |
478 | printk (KERN_INFO "TIOCSER?WILD ioctl obsolete, ignored.\n"); | |
479 | return 0; | |
480 | ||
481 | default: | |
482 | return -ENOIOCTLCMD; | |
483 | } | |
484 | return 0; | |
485 | } | |
486 | ||
487 | #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) | |
488 | ||
f889a26a | 489 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 LT |
490 | { |
491 | unsigned int cflag = tty->termios->c_cflag; | |
492 | ||
493 | if ( (cflag == old_termios->c_cflag) | |
494 | && ( RELEVANT_IFLAG(tty->termios->c_iflag) | |
495 | == RELEVANT_IFLAG(old_termios->c_iflag))) | |
496 | return; | |
497 | ||
498 | ||
499 | /* Handle turning off CRTSCTS */ | |
500 | if ((old_termios->c_cflag & CRTSCTS) && | |
501 | !(tty->termios->c_cflag & CRTSCTS)) { | |
502 | tty->hw_stopped = 0; | |
503 | rs_start(tty); | |
504 | } | |
505 | } | |
506 | /* | |
507 | * This routine will shutdown a serial port; interrupts are disabled, and | |
508 | * DTR is dropped if the hangup on close termio flag is on. | |
509 | */ | |
510 | static void shutdown(struct async_struct * info) | |
511 | { | |
512 | unsigned long flags; | |
513 | struct serial_state *state; | |
514 | int retval; | |
515 | ||
516 | if (!(info->flags & ASYNC_INITIALIZED)) return; | |
517 | ||
518 | state = info->state; | |
519 | ||
520 | #ifdef SIMSERIAL_DEBUG | |
521 | printk("Shutting down serial port %d (irq %d)....", info->line, | |
522 | state->irq); | |
523 | #endif | |
524 | ||
525 | local_irq_save(flags); | |
526 | { | |
527 | /* | |
528 | * First unlink the serial port from the IRQ chain... | |
529 | */ | |
530 | if (info->next_port) | |
531 | info->next_port->prev_port = info->prev_port; | |
532 | if (info->prev_port) | |
533 | info->prev_port->next_port = info->next_port; | |
534 | else | |
535 | IRQ_ports[state->irq] = info->next_port; | |
536 | ||
537 | /* | |
538 | * Free the IRQ, if necessary | |
539 | */ | |
540 | if (state->irq && (!IRQ_ports[state->irq] || | |
541 | !IRQ_ports[state->irq]->next_port)) { | |
542 | if (IRQ_ports[state->irq]) { | |
543 | free_irq(state->irq, NULL); | |
544 | retval = request_irq(state->irq, rs_interrupt_single, | |
545 | IRQ_T(info), "serial", NULL); | |
546 | ||
547 | if (retval) | |
548 | printk(KERN_ERR "serial shutdown: request_irq: error %d" | |
549 | " Couldn't reacquire IRQ.\n", retval); | |
550 | } else | |
551 | free_irq(state->irq, NULL); | |
552 | } | |
553 | ||
554 | if (info->xmit.buf) { | |
555 | free_page((unsigned long) info->xmit.buf); | |
cfa7fd72 | 556 | info->xmit.buf = NULL; |
1da177e4 LT |
557 | } |
558 | ||
559 | if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); | |
560 | ||
561 | info->flags &= ~ASYNC_INITIALIZED; | |
562 | } | |
563 | local_irq_restore(flags); | |
564 | } | |
565 | ||
566 | /* | |
567 | * ------------------------------------------------------------ | |
568 | * rs_close() | |
569 | * | |
570 | * This routine is called when the serial port gets closed. First, we | |
571 | * wait for the last remaining data to be sent. Then, we unlink its | |
572 | * async structure from the interrupt chain if necessary, and we free | |
573 | * that IRQ if nothing is left in the chain. | |
574 | * ------------------------------------------------------------ | |
575 | */ | |
576 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
577 | { | |
578 | struct async_struct * info = (struct async_struct *)tty->driver_data; | |
579 | struct serial_state *state; | |
580 | unsigned long flags; | |
581 | ||
582 | if (!info ) return; | |
583 | ||
584 | state = info->state; | |
585 | ||
586 | local_irq_save(flags); | |
587 | if (tty_hung_up_p(filp)) { | |
588 | #ifdef SIMSERIAL_DEBUG | |
589 | printk("rs_close: hung_up\n"); | |
590 | #endif | |
591 | local_irq_restore(flags); | |
592 | return; | |
593 | } | |
594 | #ifdef SIMSERIAL_DEBUG | |
595 | printk("rs_close ttys%d, count = %d\n", info->line, state->count); | |
596 | #endif | |
597 | if ((tty->count == 1) && (state->count != 1)) { | |
598 | /* | |
599 | * Uh, oh. tty->count is 1, which means that the tty | |
600 | * structure will be freed. state->count should always | |
601 | * be one in these conditions. If it's greater than | |
602 | * one, we've got real problems, since it means the | |
603 | * serial port won't be shutdown. | |
604 | */ | |
605 | printk(KERN_ERR "rs_close: bad serial port count; tty->count is 1, " | |
606 | "state->count is %d\n", state->count); | |
607 | state->count = 1; | |
608 | } | |
609 | if (--state->count < 0) { | |
610 | printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n", | |
611 | info->line, state->count); | |
612 | state->count = 0; | |
613 | } | |
614 | if (state->count) { | |
615 | local_irq_restore(flags); | |
616 | return; | |
617 | } | |
618 | info->flags |= ASYNC_CLOSING; | |
619 | local_irq_restore(flags); | |
620 | ||
621 | /* | |
622 | * Now we wait for the transmit buffer to clear; and we notify | |
623 | * the line discipline to only process XON/XOFF characters. | |
624 | */ | |
625 | shutdown(info); | |
f34d7a5b AC |
626 | if (tty->ops->flush_buffer) |
627 | tty->ops->flush_buffer(tty); | |
1da177e4 LT |
628 | if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); |
629 | info->event = 0; | |
cfa7fd72 | 630 | info->tty = NULL; |
1da177e4 | 631 | if (info->blocked_open) { |
9e173c03 NA |
632 | if (info->close_delay) |
633 | schedule_timeout_interruptible(info->close_delay); | |
1da177e4 LT |
634 | wake_up_interruptible(&info->open_wait); |
635 | } | |
636 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | |
637 | wake_up_interruptible(&info->close_wait); | |
638 | } | |
639 | ||
640 | /* | |
641 | * rs_wait_until_sent() --- wait until the transmitter is empty | |
642 | */ | |
643 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
644 | { | |
645 | } | |
646 | ||
647 | ||
648 | /* | |
649 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
650 | */ | |
651 | static void rs_hangup(struct tty_struct *tty) | |
652 | { | |
653 | struct async_struct * info = (struct async_struct *)tty->driver_data; | |
654 | struct serial_state *state = info->state; | |
655 | ||
656 | #ifdef SIMSERIAL_DEBUG | |
657 | printk("rs_hangup: called\n"); | |
658 | #endif | |
659 | ||
660 | state = info->state; | |
661 | ||
662 | rs_flush_buffer(tty); | |
663 | if (info->flags & ASYNC_CLOSING) | |
664 | return; | |
665 | shutdown(info); | |
666 | ||
667 | info->event = 0; | |
668 | state->count = 0; | |
669 | info->flags &= ~ASYNC_NORMAL_ACTIVE; | |
cfa7fd72 | 670 | info->tty = NULL; |
1da177e4 LT |
671 | wake_up_interruptible(&info->open_wait); |
672 | } | |
673 | ||
674 | ||
675 | static int get_async_struct(int line, struct async_struct **ret_info) | |
676 | { | |
677 | struct async_struct *info; | |
678 | struct serial_state *sstate; | |
679 | ||
680 | sstate = rs_table + line; | |
681 | sstate->count++; | |
682 | if (sstate->info) { | |
683 | *ret_info = sstate->info; | |
684 | return 0; | |
685 | } | |
52fd9108 | 686 | info = kzalloc(sizeof(struct async_struct), GFP_KERNEL); |
1da177e4 LT |
687 | if (!info) { |
688 | sstate->count--; | |
689 | return -ENOMEM; | |
690 | } | |
1da177e4 LT |
691 | init_waitqueue_head(&info->open_wait); |
692 | init_waitqueue_head(&info->close_wait); | |
693 | init_waitqueue_head(&info->delta_msr_wait); | |
694 | info->magic = SERIAL_MAGIC; | |
695 | info->port = sstate->port; | |
696 | info->flags = sstate->flags; | |
697 | info->xmit_fifo_size = sstate->xmit_fifo_size; | |
698 | info->line = line; | |
6d5aefb8 | 699 | INIT_WORK(&info->work, do_softint); |
1da177e4 LT |
700 | info->state = sstate; |
701 | if (sstate->info) { | |
702 | kfree(info); | |
703 | *ret_info = sstate->info; | |
704 | return 0; | |
705 | } | |
706 | *ret_info = sstate->info = info; | |
707 | return 0; | |
708 | } | |
709 | ||
710 | static int | |
711 | startup(struct async_struct *info) | |
712 | { | |
713 | unsigned long flags; | |
714 | int retval=0; | |
40220c1a | 715 | irq_handler_t handler; |
1da177e4 LT |
716 | struct serial_state *state= info->state; |
717 | unsigned long page; | |
718 | ||
719 | page = get_zeroed_page(GFP_KERNEL); | |
720 | if (!page) | |
721 | return -ENOMEM; | |
722 | ||
723 | local_irq_save(flags); | |
724 | ||
725 | if (info->flags & ASYNC_INITIALIZED) { | |
726 | free_page(page); | |
727 | goto errout; | |
728 | } | |
729 | ||
730 | if (!state->port || !state->type) { | |
731 | if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); | |
732 | free_page(page); | |
733 | goto errout; | |
734 | } | |
735 | if (info->xmit.buf) | |
736 | free_page(page); | |
737 | else | |
738 | info->xmit.buf = (unsigned char *) page; | |
739 | ||
740 | #ifdef SIMSERIAL_DEBUG | |
741 | printk("startup: ttys%d (irq %d)...", info->line, state->irq); | |
742 | #endif | |
743 | ||
744 | /* | |
745 | * Allocate the IRQ if necessary | |
746 | */ | |
747 | if (state->irq && (!IRQ_ports[state->irq] || | |
748 | !IRQ_ports[state->irq]->next_port)) { | |
749 | if (IRQ_ports[state->irq]) { | |
750 | retval = -EBUSY; | |
751 | goto errout; | |
752 | } else | |
753 | handler = rs_interrupt_single; | |
754 | ||
755 | retval = request_irq(state->irq, handler, IRQ_T(info), "simserial", NULL); | |
756 | if (retval) { | |
757 | if (capable(CAP_SYS_ADMIN)) { | |
758 | if (info->tty) | |
759 | set_bit(TTY_IO_ERROR, | |
760 | &info->tty->flags); | |
761 | retval = 0; | |
762 | } | |
763 | goto errout; | |
764 | } | |
765 | } | |
766 | ||
767 | /* | |
768 | * Insert serial port into IRQ chain. | |
769 | */ | |
cfa7fd72 | 770 | info->prev_port = NULL; |
1da177e4 LT |
771 | info->next_port = IRQ_ports[state->irq]; |
772 | if (info->next_port) | |
773 | info->next_port->prev_port = info; | |
774 | IRQ_ports[state->irq] = info; | |
775 | ||
776 | if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
777 | ||
778 | info->xmit.head = info->xmit.tail = 0; | |
779 | ||
780 | #if 0 | |
781 | /* | |
782 | * Set up serial timers... | |
783 | */ | |
784 | timer_table[RS_TIMER].expires = jiffies + 2*HZ/100; | |
785 | timer_active |= 1 << RS_TIMER; | |
786 | #endif | |
787 | ||
788 | /* | |
789 | * Set up the tty->alt_speed kludge | |
790 | */ | |
791 | if (info->tty) { | |
792 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | |
793 | info->tty->alt_speed = 57600; | |
794 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | |
795 | info->tty->alt_speed = 115200; | |
796 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | |
797 | info->tty->alt_speed = 230400; | |
798 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | |
799 | info->tty->alt_speed = 460800; | |
800 | } | |
801 | ||
802 | info->flags |= ASYNC_INITIALIZED; | |
803 | local_irq_restore(flags); | |
804 | return 0; | |
805 | ||
806 | errout: | |
807 | local_irq_restore(flags); | |
808 | return retval; | |
809 | } | |
810 | ||
811 | ||
812 | /* | |
813 | * This routine is called whenever a serial port is opened. It | |
814 | * enables interrupts for a serial port, linking in its async structure into | |
815 | * the IRQ chain. It also performs the serial-specific | |
816 | * initialization for the tty structure. | |
817 | */ | |
818 | static int rs_open(struct tty_struct *tty, struct file * filp) | |
819 | { | |
820 | struct async_struct *info; | |
821 | int retval, line; | |
822 | unsigned long page; | |
823 | ||
824 | line = tty->index; | |
825 | if ((line < 0) || (line >= NR_PORTS)) | |
826 | return -ENODEV; | |
827 | retval = get_async_struct(line, &info); | |
828 | if (retval) | |
829 | return retval; | |
830 | tty->driver_data = info; | |
831 | info->tty = tty; | |
832 | ||
833 | #ifdef SIMSERIAL_DEBUG | |
834 | printk("rs_open %s, count = %d\n", tty->name, info->state->count); | |
835 | #endif | |
836 | info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; | |
837 | ||
838 | if (!tmp_buf) { | |
839 | page = get_zeroed_page(GFP_KERNEL); | |
840 | if (!page) | |
841 | return -ENOMEM; | |
842 | if (tmp_buf) | |
843 | free_page(page); | |
844 | else | |
845 | tmp_buf = (unsigned char *) page; | |
846 | } | |
847 | ||
848 | /* | |
849 | * If the port is the middle of closing, bail out now | |
850 | */ | |
851 | if (tty_hung_up_p(filp) || | |
852 | (info->flags & ASYNC_CLOSING)) { | |
853 | if (info->flags & ASYNC_CLOSING) | |
854 | interruptible_sleep_on(&info->close_wait); | |
855 | #ifdef SERIAL_DO_RESTART | |
856 | return ((info->flags & ASYNC_HUP_NOTIFY) ? | |
857 | -EAGAIN : -ERESTARTSYS); | |
858 | #else | |
859 | return -EAGAIN; | |
860 | #endif | |
861 | } | |
862 | ||
863 | /* | |
864 | * Start up serial port | |
865 | */ | |
866 | retval = startup(info); | |
867 | if (retval) { | |
868 | return retval; | |
869 | } | |
870 | ||
871 | /* | |
872 | * figure out which console to use (should be one already) | |
873 | */ | |
874 | console = console_drivers; | |
875 | while (console) { | |
876 | if ((console->flags & CON_ENABLED) && console->write) break; | |
877 | console = console->next; | |
878 | } | |
879 | ||
880 | #ifdef SIMSERIAL_DEBUG | |
881 | printk("rs_open ttys%d successful\n", info->line); | |
882 | #endif | |
883 | return 0; | |
884 | } | |
885 | ||
886 | /* | |
887 | * /proc fs routines.... | |
888 | */ | |
889 | ||
890 | static inline int line_info(char *buf, struct serial_state *state) | |
891 | { | |
892 | return sprintf(buf, "%d: uart:%s port:%lX irq:%d\n", | |
893 | state->line, uart_config[state->type].name, | |
894 | state->port, state->irq); | |
895 | } | |
896 | ||
897 | static int rs_read_proc(char *page, char **start, off_t off, int count, | |
898 | int *eof, void *data) | |
899 | { | |
900 | int i, len = 0, l; | |
901 | off_t begin = 0; | |
902 | ||
903 | len += sprintf(page, "simserinfo:1.0 driver:%s\n", serial_version); | |
904 | for (i = 0; i < NR_PORTS && len < 4000; i++) { | |
905 | l = line_info(page + len, &rs_table[i]); | |
906 | len += l; | |
907 | if (len+begin > off+count) | |
908 | goto done; | |
909 | if (len+begin < off) { | |
910 | begin += len; | |
911 | len = 0; | |
912 | } | |
913 | } | |
914 | *eof = 1; | |
915 | done: | |
916 | if (off >= len+begin) | |
917 | return 0; | |
918 | *start = page + (begin-off); | |
919 | return ((count < begin+len-off) ? count : begin+len-off); | |
920 | } | |
921 | ||
922 | /* | |
923 | * --------------------------------------------------------------------- | |
924 | * rs_init() and friends | |
925 | * | |
926 | * rs_init() is called at boot-time to initialize the serial driver. | |
927 | * --------------------------------------------------------------------- | |
928 | */ | |
929 | ||
930 | /* | |
931 | * This routine prints out the appropriate serial driver version | |
932 | * number, and identifies which options were configured into this | |
933 | * driver. | |
934 | */ | |
935 | static inline void show_serial_version(void) | |
936 | { | |
937 | printk(KERN_INFO "%s version %s with", serial_name, serial_version); | |
938 | printk(KERN_INFO " no serial options enabled\n"); | |
939 | } | |
940 | ||
b68e31d0 | 941 | static const struct tty_operations hp_ops = { |
1da177e4 LT |
942 | .open = rs_open, |
943 | .close = rs_close, | |
944 | .write = rs_write, | |
945 | .put_char = rs_put_char, | |
946 | .flush_chars = rs_flush_chars, | |
947 | .write_room = rs_write_room, | |
948 | .chars_in_buffer = rs_chars_in_buffer, | |
949 | .flush_buffer = rs_flush_buffer, | |
950 | .ioctl = rs_ioctl, | |
951 | .throttle = rs_throttle, | |
952 | .unthrottle = rs_unthrottle, | |
953 | .send_xchar = rs_send_xchar, | |
954 | .set_termios = rs_set_termios, | |
955 | .stop = rs_stop, | |
956 | .start = rs_start, | |
957 | .hangup = rs_hangup, | |
958 | .break_ctl = rs_break, | |
959 | .wait_until_sent = rs_wait_until_sent, | |
960 | .read_proc = rs_read_proc, | |
961 | }; | |
962 | ||
963 | /* | |
964 | * The serial driver boot-time initialization code! | |
965 | */ | |
966 | static int __init | |
967 | simrs_init (void) | |
968 | { | |
3b5cc090 | 969 | int i, rc; |
1da177e4 LT |
970 | struct serial_state *state; |
971 | ||
972 | if (!ia64_platform_is("hpsim")) | |
973 | return -ENODEV; | |
974 | ||
975 | hp_simserial_driver = alloc_tty_driver(1); | |
976 | if (!hp_simserial_driver) | |
977 | return -ENOMEM; | |
978 | ||
979 | show_serial_version(); | |
980 | ||
981 | /* Initialize the tty_driver structure */ | |
982 | ||
983 | hp_simserial_driver->owner = THIS_MODULE; | |
984 | hp_simserial_driver->driver_name = "simserial"; | |
985 | hp_simserial_driver->name = "ttyS"; | |
986 | hp_simserial_driver->major = TTY_MAJOR; | |
987 | hp_simserial_driver->minor_start = 64; | |
988 | hp_simserial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
989 | hp_simserial_driver->subtype = SERIAL_TYPE_NORMAL; | |
990 | hp_simserial_driver->init_termios = tty_std_termios; | |
991 | hp_simserial_driver->init_termios.c_cflag = | |
992 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
993 | hp_simserial_driver->flags = TTY_DRIVER_REAL_RAW; | |
994 | tty_set_operations(hp_simserial_driver, &hp_ops); | |
995 | ||
996 | /* | |
997 | * Let's have a little bit of fun ! | |
998 | */ | |
999 | for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) { | |
1000 | ||
1001 | if (state->type == PORT_UNKNOWN) continue; | |
1002 | ||
1003 | if (!state->irq) { | |
3b5cc090 KK |
1004 | if ((rc = assign_irq_vector(AUTO_ASSIGN)) < 0) |
1005 | panic("%s: out of interrupt vectors!\n", | |
d4ed8084 | 1006 | __func__); |
3b5cc090 | 1007 | state->irq = rc; |
1da177e4 LT |
1008 | ia64_ssc_connect_irq(KEYBOARD_INTR, state->irq); |
1009 | } | |
1010 | ||
1011 | printk(KERN_INFO "ttyS%d at 0x%04lx (irq = %d) is a %s\n", | |
1012 | state->line, | |
1013 | state->port, state->irq, | |
1014 | uart_config[state->type].name); | |
1015 | } | |
1016 | ||
1017 | if (tty_register_driver(hp_simserial_driver)) | |
1018 | panic("Couldn't register simserial driver\n"); | |
1019 | ||
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | #ifndef MODULE | |
1024 | __initcall(simrs_init); | |
1025 | #endif |