diff options
Diffstat (limited to 'drivers/char/amiserial.c')
-rw-r--r-- | drivers/char/amiserial.c | 2178 |
1 files changed, 0 insertions, 2178 deletions
diff --git a/drivers/char/amiserial.c b/drivers/char/amiserial.c deleted file mode 100644 index 6ee3348bc3e4..000000000000 --- a/drivers/char/amiserial.c +++ /dev/null | |||
@@ -1,2178 +0,0 @@ | |||
1 | /* | ||
2 | * linux/drivers/char/amiserial.c | ||
3 | * | ||
4 | * Serial driver for the amiga builtin port. | ||
5 | * | ||
6 | * This code was created by taking serial.c version 4.30 from kernel | ||
7 | * release 2.3.22, replacing all hardware related stuff with the | ||
8 | * corresponding amiga hardware actions, and removing all irrelevant | ||
9 | * code. As a consequence, it uses many of the constants and names | ||
10 | * associated with the registers and bits of 16550 compatible UARTS - | ||
11 | * but only to keep track of status, etc in the state variables. It | ||
12 | * was done this was to make it easier to keep the code in line with | ||
13 | * (non hardware specific) changes to serial.c. | ||
14 | * | ||
15 | * The port is registered with the tty driver as minor device 64, and | ||
16 | * therefore other ports should should only use 65 upwards. | ||
17 | * | ||
18 | * Richard Lucock 28/12/99 | ||
19 | * | ||
20 | * Copyright (C) 1991, 1992 Linus Torvalds | ||
21 | * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, | ||
22 | * 1998, 1999 Theodore Ts'o | ||
23 | * | ||
24 | */ | ||
25 | |||
26 | /* | ||
27 | * Serial driver configuration section. Here are the various options: | ||
28 | * | ||
29 | * SERIAL_PARANOIA_CHECK | ||
30 | * Check the magic number for the async_structure where | ||
31 | * ever possible. | ||
32 | */ | ||
33 | |||
34 | #include <linux/delay.h> | ||
35 | |||
36 | #undef SERIAL_PARANOIA_CHECK | ||
37 | #define SERIAL_DO_RESTART | ||
38 | |||
39 | /* Set of debugging defines */ | ||
40 | |||
41 | #undef SERIAL_DEBUG_INTR | ||
42 | #undef SERIAL_DEBUG_OPEN | ||
43 | #undef SERIAL_DEBUG_FLOW | ||
44 | #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | ||
45 | |||
46 | /* Sanity checks */ | ||
47 | |||
48 | #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) | ||
49 | #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ | ||
50 | tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s) | ||
51 | #else | ||
52 | #define DBG_CNT(s) | ||
53 | #endif | ||
54 | |||
55 | /* | ||
56 | * End of serial driver configuration section. | ||
57 | */ | ||
58 | |||
59 | #include <linux/module.h> | ||
60 | |||
61 | #include <linux/types.h> | ||
62 | #include <linux/serial.h> | ||
63 | #include <linux/serialP.h> | ||
64 | #include <linux/serial_reg.h> | ||
65 | static char *serial_version = "4.30"; | ||
66 | |||
67 | #include <linux/errno.h> | ||
68 | #include <linux/signal.h> | ||
69 | #include <linux/sched.h> | ||
70 | #include <linux/kernel.h> | ||
71 | #include <linux/timer.h> | ||
72 | #include <linux/interrupt.h> | ||
73 | #include <linux/tty.h> | ||
74 | #include <linux/tty_flip.h> | ||
75 | #include <linux/console.h> | ||
76 | #include <linux/major.h> | ||
77 | #include <linux/string.h> | ||
78 | #include <linux/fcntl.h> | ||
79 | #include <linux/ptrace.h> | ||
80 | #include <linux/ioport.h> | ||
81 | #include <linux/mm.h> | ||
82 | #include <linux/seq_file.h> | ||
83 | #include <linux/slab.h> | ||
84 | #include <linux/init.h> | ||
85 | #include <linux/bitops.h> | ||
86 | #include <linux/platform_device.h> | ||
87 | |||
88 | #include <asm/setup.h> | ||
89 | |||
90 | #include <asm/system.h> | ||
91 | |||
92 | #include <asm/irq.h> | ||
93 | |||
94 | #include <asm/amigahw.h> | ||
95 | #include <asm/amigaints.h> | ||
96 | |||
97 | #define custom amiga_custom | ||
98 | static char *serial_name = "Amiga-builtin serial driver"; | ||
99 | |||
100 | static struct tty_driver *serial_driver; | ||
101 | |||
102 | /* number of characters left in xmit buffer before we ask for more */ | ||
103 | #define WAKEUP_CHARS 256 | ||
104 | |||
105 | static struct async_struct *IRQ_ports; | ||
106 | |||
107 | static unsigned char current_ctl_bits; | ||
108 | |||
109 | static void change_speed(struct async_struct *info, struct ktermios *old); | ||
110 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); | ||
111 | |||
112 | |||
113 | static struct serial_state rs_table[1]; | ||
114 | |||
115 | #define NR_PORTS ARRAY_SIZE(rs_table) | ||
116 | |||
117 | #include <asm/uaccess.h> | ||
118 | |||
119 | #define serial_isroot() (capable(CAP_SYS_ADMIN)) | ||
120 | |||
121 | |||
122 | static inline int serial_paranoia_check(struct async_struct *info, | ||
123 | char *name, const char *routine) | ||
124 | { | ||
125 | #ifdef SERIAL_PARANOIA_CHECK | ||
126 | static const char *badmagic = | ||
127 | "Warning: bad magic number for serial struct (%s) in %s\n"; | ||
128 | static const char *badinfo = | ||
129 | "Warning: null async_struct for (%s) in %s\n"; | ||
130 | |||
131 | if (!info) { | ||
132 | printk(badinfo, name, routine); | ||
133 | return 1; | ||
134 | } | ||
135 | if (info->magic != SERIAL_MAGIC) { | ||
136 | printk(badmagic, name, routine); | ||
137 | return 1; | ||
138 | } | ||
139 | #endif | ||
140 | return 0; | ||
141 | } | ||
142 | |||
143 | /* some serial hardware definitions */ | ||
144 | #define SDR_OVRUN (1<<15) | ||
145 | #define SDR_RBF (1<<14) | ||
146 | #define SDR_TBE (1<<13) | ||
147 | #define SDR_TSRE (1<<12) | ||
148 | |||
149 | #define SERPER_PARENB (1<<15) | ||
150 | |||
151 | #define AC_SETCLR (1<<15) | ||
152 | #define AC_UARTBRK (1<<11) | ||
153 | |||
154 | #define SER_DTR (1<<7) | ||
155 | #define SER_RTS (1<<6) | ||
156 | #define SER_DCD (1<<5) | ||
157 | #define SER_CTS (1<<4) | ||
158 | #define SER_DSR (1<<3) | ||
159 | |||
160 | static __inline__ void rtsdtr_ctrl(int bits) | ||
161 | { | ||
162 | ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); | ||
163 | } | ||
164 | |||
165 | /* | ||
166 | * ------------------------------------------------------------ | ||
167 | * rs_stop() and rs_start() | ||
168 | * | ||
169 | * This routines are called before setting or resetting tty->stopped. | ||
170 | * They enable or disable transmitter interrupts, as necessary. | ||
171 | * ------------------------------------------------------------ | ||
172 | */ | ||
173 | static void rs_stop(struct tty_struct *tty) | ||
174 | { | ||
175 | struct async_struct *info = tty->driver_data; | ||
176 | unsigned long flags; | ||
177 | |||
178 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | ||
179 | return; | ||
180 | |||
181 | local_irq_save(flags); | ||
182 | if (info->IER & UART_IER_THRI) { | ||
183 | info->IER &= ~UART_IER_THRI; | ||
184 | /* disable Tx interrupt and remove any pending interrupts */ | ||
185 | custom.intena = IF_TBE; | ||
186 | mb(); | ||
187 | custom.intreq = IF_TBE; | ||
188 | mb(); | ||
189 | } | ||
190 | local_irq_restore(flags); | ||
191 | } | ||
192 | |||
193 | static void rs_start(struct tty_struct *tty) | ||
194 | { | ||
195 | struct async_struct *info = tty->driver_data; | ||
196 | unsigned long flags; | ||
197 | |||
198 | if (serial_paranoia_check(info, tty->name, "rs_start")) | ||
199 | return; | ||
200 | |||
201 | local_irq_save(flags); | ||
202 | if (info->xmit.head != info->xmit.tail | ||
203 | && info->xmit.buf | ||
204 | && !(info->IER & UART_IER_THRI)) { | ||
205 | info->IER |= UART_IER_THRI; | ||
206 | custom.intena = IF_SETCLR | IF_TBE; | ||
207 | mb(); | ||
208 | /* set a pending Tx Interrupt, transmitter should restart now */ | ||
209 | custom.intreq = IF_SETCLR | IF_TBE; | ||
210 | mb(); | ||
211 | } | ||
212 | local_irq_restore(flags); | ||
213 | } | ||
214 | |||
215 | /* | ||
216 | * ---------------------------------------------------------------------- | ||
217 | * | ||
218 | * Here starts the interrupt handling routines. All of the following | ||
219 | * subroutines are declared as inline and are folded into | ||
220 | * rs_interrupt(). They were separated out for readability's sake. | ||
221 | * | ||
222 | * Note: rs_interrupt() is a "fast" interrupt, which means that it | ||
223 | * runs with interrupts turned off. People who may want to modify | ||
224 | * rs_interrupt() should try to keep the interrupt handler as fast as | ||
225 | * possible. After you are done making modifications, it is not a bad | ||
226 | * idea to do: | ||
227 | * | ||
228 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c | ||
229 | * | ||
230 | * and look at the resulting assemble code in serial.s. | ||
231 | * | ||
232 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | ||
233 | * ----------------------------------------------------------------------- | ||
234 | */ | ||
235 | |||
236 | /* | ||
237 | * This routine is used by the interrupt handler to schedule | ||
238 | * processing in the software interrupt portion of the driver. | ||
239 | */ | ||
240 | static void rs_sched_event(struct async_struct *info, | ||
241 | int event) | ||
242 | { | ||
243 | info->event |= 1 << event; | ||
244 | tasklet_schedule(&info->tlet); | ||
245 | } | ||
246 | |||
247 | static void receive_chars(struct async_struct *info) | ||
248 | { | ||
249 | int status; | ||
250 | int serdatr; | ||
251 | struct tty_struct *tty = info->tty; | ||
252 | unsigned char ch, flag; | ||
253 | struct async_icount *icount; | ||
254 | int oe = 0; | ||
255 | |||
256 | icount = &info->state->icount; | ||
257 | |||
258 | status = UART_LSR_DR; /* We obviously have a character! */ | ||
259 | serdatr = custom.serdatr; | ||
260 | mb(); | ||
261 | custom.intreq = IF_RBF; | ||
262 | mb(); | ||
263 | |||
264 | if((serdatr & 0x1ff) == 0) | ||
265 | status |= UART_LSR_BI; | ||
266 | if(serdatr & SDR_OVRUN) | ||
267 | status |= UART_LSR_OE; | ||
268 | |||
269 | ch = serdatr & 0xff; | ||
270 | icount->rx++; | ||
271 | |||
272 | #ifdef SERIAL_DEBUG_INTR | ||
273 | printk("DR%02x:%02x...", ch, status); | ||
274 | #endif | ||
275 | flag = TTY_NORMAL; | ||
276 | |||
277 | /* | ||
278 | * We don't handle parity or frame errors - but I have left | ||
279 | * the code in, since I'm not sure that the errors can't be | ||
280 | * detected. | ||
281 | */ | ||
282 | |||
283 | if (status & (UART_LSR_BI | UART_LSR_PE | | ||
284 | UART_LSR_FE | UART_LSR_OE)) { | ||
285 | /* | ||
286 | * For statistics only | ||
287 | */ | ||
288 | if (status & UART_LSR_BI) { | ||
289 | status &= ~(UART_LSR_FE | UART_LSR_PE); | ||
290 | icount->brk++; | ||
291 | } else if (status & UART_LSR_PE) | ||
292 | icount->parity++; | ||
293 | else if (status & UART_LSR_FE) | ||
294 | icount->frame++; | ||
295 | if (status & UART_LSR_OE) | ||
296 | icount->overrun++; | ||
297 | |||
298 | /* | ||
299 | * Now check to see if character should be | ||
300 | * ignored, and mask off conditions which | ||
301 | * should be ignored. | ||
302 | */ | ||
303 | if (status & info->ignore_status_mask) | ||
304 | goto out; | ||
305 | |||
306 | status &= info->read_status_mask; | ||
307 | |||
308 | if (status & (UART_LSR_BI)) { | ||
309 | #ifdef SERIAL_DEBUG_INTR | ||
310 | printk("handling break...."); | ||
311 | #endif | ||
312 | flag = TTY_BREAK; | ||
313 | if (info->flags & ASYNC_SAK) | ||
314 | do_SAK(tty); | ||
315 | } else if (status & UART_LSR_PE) | ||
316 | flag = TTY_PARITY; | ||
317 | else if (status & UART_LSR_FE) | ||
318 | flag = TTY_FRAME; | ||
319 | if (status & UART_LSR_OE) { | ||
320 | /* | ||
321 | * Overrun is special, since it's | ||
322 | * reported immediately, and doesn't | ||
323 | * affect the current character | ||
324 | */ | ||
325 | oe = 1; | ||
326 | } | ||
327 | } | ||
328 | tty_insert_flip_char(tty, ch, flag); | ||
329 | if (oe == 1) | ||
330 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | ||
331 | tty_flip_buffer_push(tty); | ||
332 | out: | ||
333 | return; | ||
334 | } | ||
335 | |||
336 | static void transmit_chars(struct async_struct *info) | ||
337 | { | ||
338 | custom.intreq = IF_TBE; | ||
339 | mb(); | ||
340 | if (info->x_char) { | ||
341 | custom.serdat = info->x_char | 0x100; | ||
342 | mb(); | ||
343 | info->state->icount.tx++; | ||
344 | info->x_char = 0; | ||
345 | return; | ||
346 | } | ||
347 | if (info->xmit.head == info->xmit.tail | ||
348 | || info->tty->stopped | ||
349 | || info->tty->hw_stopped) { | ||
350 | info->IER &= ~UART_IER_THRI; | ||
351 | custom.intena = IF_TBE; | ||
352 | mb(); | ||
353 | return; | ||
354 | } | ||
355 | |||
356 | custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; | ||
357 | mb(); | ||
358 | info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); | ||
359 | info->state->icount.tx++; | ||
360 | |||
361 | if (CIRC_CNT(info->xmit.head, | ||
362 | info->xmit.tail, | ||
363 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) | ||
364 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); | ||
365 | |||
366 | #ifdef SERIAL_DEBUG_INTR | ||
367 | printk("THRE..."); | ||
368 | #endif | ||
369 | if (info->xmit.head == info->xmit.tail) { | ||
370 | custom.intena = IF_TBE; | ||
371 | mb(); | ||
372 | info->IER &= ~UART_IER_THRI; | ||
373 | } | ||
374 | } | ||
375 | |||
376 | static void check_modem_status(struct async_struct *info) | ||
377 | { | ||
378 | unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); | ||
379 | unsigned char dstatus; | ||
380 | struct async_icount *icount; | ||
381 | |||
382 | /* Determine bits that have changed */ | ||
383 | dstatus = status ^ current_ctl_bits; | ||
384 | current_ctl_bits = status; | ||
385 | |||
386 | if (dstatus) { | ||
387 | icount = &info->state->icount; | ||
388 | /* update input line counters */ | ||
389 | if (dstatus & SER_DSR) | ||
390 | icount->dsr++; | ||
391 | if (dstatus & SER_DCD) { | ||
392 | icount->dcd++; | ||
393 | #ifdef CONFIG_HARD_PPS | ||
394 | if ((info->flags & ASYNC_HARDPPS_CD) && | ||
395 | !(status & SER_DCD)) | ||
396 | hardpps(); | ||
397 | #endif | ||
398 | } | ||
399 | if (dstatus & SER_CTS) | ||
400 | icount->cts++; | ||
401 | wake_up_interruptible(&info->delta_msr_wait); | ||
402 | } | ||
403 | |||
404 | if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) { | ||
405 | #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) | ||
406 | printk("ttyS%d CD now %s...", info->line, | ||
407 | (!(status & SER_DCD)) ? "on" : "off"); | ||
408 | #endif | ||
409 | if (!(status & SER_DCD)) | ||
410 | wake_up_interruptible(&info->open_wait); | ||
411 | else { | ||
412 | #ifdef SERIAL_DEBUG_OPEN | ||
413 | printk("doing serial hangup..."); | ||
414 | #endif | ||
415 | if (info->tty) | ||
416 | tty_hangup(info->tty); | ||
417 | } | ||
418 | } | ||
419 | if (info->flags & ASYNC_CTS_FLOW) { | ||
420 | if (info->tty->hw_stopped) { | ||
421 | if (!(status & SER_CTS)) { | ||
422 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) | ||
423 | printk("CTS tx start..."); | ||
424 | #endif | ||
425 | info->tty->hw_stopped = 0; | ||
426 | info->IER |= UART_IER_THRI; | ||
427 | custom.intena = IF_SETCLR | IF_TBE; | ||
428 | mb(); | ||
429 | /* set a pending Tx Interrupt, transmitter should restart now */ | ||
430 | custom.intreq = IF_SETCLR | IF_TBE; | ||
431 | mb(); | ||
432 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); | ||
433 | return; | ||
434 | } | ||
435 | } else { | ||
436 | if ((status & SER_CTS)) { | ||
437 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) | ||
438 | printk("CTS tx stop..."); | ||
439 | #endif | ||
440 | info->tty->hw_stopped = 1; | ||
441 | info->IER &= ~UART_IER_THRI; | ||
442 | /* disable Tx interrupt and remove any pending interrupts */ | ||
443 | custom.intena = IF_TBE; | ||
444 | mb(); | ||
445 | custom.intreq = IF_TBE; | ||
446 | mb(); | ||
447 | } | ||
448 | } | ||
449 | } | ||
450 | } | ||
451 | |||
452 | static irqreturn_t ser_vbl_int( int irq, void *data) | ||
453 | { | ||
454 | /* vbl is just a periodic interrupt we tie into to update modem status */ | ||
455 | struct async_struct * info = IRQ_ports; | ||
456 | /* | ||
457 | * TBD - is it better to unregister from this interrupt or to | ||
458 | * ignore it if MSI is clear ? | ||
459 | */ | ||
460 | if(info->IER & UART_IER_MSI) | ||
461 | check_modem_status(info); | ||
462 | return IRQ_HANDLED; | ||
463 | } | ||
464 | |||
465 | static irqreturn_t ser_rx_int(int irq, void *dev_id) | ||
466 | { | ||
467 | struct async_struct * info; | ||
468 | |||
469 | #ifdef SERIAL_DEBUG_INTR | ||
470 | printk("ser_rx_int..."); | ||
471 | #endif | ||
472 | |||
473 | info = IRQ_ports; | ||
474 | if (!info || !info->tty) | ||
475 | return IRQ_NONE; | ||
476 | |||
477 | receive_chars(info); | ||
478 | info->last_active = jiffies; | ||
479 | #ifdef SERIAL_DEBUG_INTR | ||
480 | printk("end.\n"); | ||
481 | #endif | ||
482 | return IRQ_HANDLED; | ||
483 | } | ||
484 | |||
485 | static irqreturn_t ser_tx_int(int irq, void *dev_id) | ||
486 | { | ||
487 | struct async_struct * info; | ||
488 | |||
489 | if (custom.serdatr & SDR_TBE) { | ||
490 | #ifdef SERIAL_DEBUG_INTR | ||
491 | printk("ser_tx_int..."); | ||
492 | #endif | ||
493 | |||
494 | info = IRQ_ports; | ||
495 | if (!info || !info->tty) | ||
496 | return IRQ_NONE; | ||
497 | |||
498 | transmit_chars(info); | ||
499 | info->last_active = jiffies; | ||
500 | #ifdef SERIAL_DEBUG_INTR | ||
501 | printk("end.\n"); | ||
502 | #endif | ||
503 | } | ||
504 | return IRQ_HANDLED; | ||
505 | } | ||
506 | |||
507 | /* | ||
508 | * ------------------------------------------------------------------- | ||
509 | * Here ends the serial interrupt routines. | ||
510 | * ------------------------------------------------------------------- | ||
511 | */ | ||
512 | |||
513 | /* | ||
514 | * This routine is used to handle the "bottom half" processing for the | ||
515 | * serial driver, known also the "software interrupt" processing. | ||
516 | * This processing is done at the kernel interrupt level, after the | ||
517 | * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This | ||
518 | * is where time-consuming activities which can not be done in the | ||
519 | * interrupt driver proper are done; the interrupt driver schedules | ||
520 | * them using rs_sched_event(), and they get done here. | ||
521 | */ | ||
522 | |||
523 | static void do_softint(unsigned long private_) | ||
524 | { | ||
525 | struct async_struct *info = (struct async_struct *) private_; | ||
526 | struct tty_struct *tty; | ||
527 | |||
528 | tty = info->tty; | ||
529 | if (!tty) | ||
530 | return; | ||
531 | |||
532 | if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) | ||
533 | tty_wakeup(tty); | ||
534 | } | ||
535 | |||
536 | /* | ||
537 | * --------------------------------------------------------------- | ||
538 | * Low level utility subroutines for the serial driver: routines to | ||
539 | * figure out the appropriate timeout for an interrupt chain, routines | ||
540 | * to initialize and startup a serial port, and routines to shutdown a | ||
541 | * serial port. Useful stuff like that. | ||
542 | * --------------------------------------------------------------- | ||
543 | */ | ||
544 | |||
545 | static int startup(struct async_struct * info) | ||
546 | { | ||
547 | unsigned long flags; | ||
548 | int retval=0; | ||
549 | unsigned long page; | ||
550 | |||
551 | page = get_zeroed_page(GFP_KERNEL); | ||
552 | if (!page) | ||
553 | return -ENOMEM; | ||
554 | |||
555 | local_irq_save(flags); | ||
556 | |||
557 | if (info->flags & ASYNC_INITIALIZED) { | ||
558 | free_page(page); | ||
559 | goto errout; | ||
560 | } | ||
561 | |||
562 | if (info->xmit.buf) | ||
563 | free_page(page); | ||
564 | else | ||
565 | info->xmit.buf = (unsigned char *) page; | ||
566 | |||
567 | #ifdef SERIAL_DEBUG_OPEN | ||
568 | printk("starting up ttys%d ...", info->line); | ||
569 | #endif | ||
570 | |||
571 | /* Clear anything in the input buffer */ | ||
572 | |||
573 | custom.intreq = IF_RBF; | ||
574 | mb(); | ||
575 | |||
576 | retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); | ||
577 | if (retval) { | ||
578 | if (serial_isroot()) { | ||
579 | if (info->tty) | ||
580 | set_bit(TTY_IO_ERROR, | ||
581 | &info->tty->flags); | ||
582 | retval = 0; | ||
583 | } | ||
584 | goto errout; | ||
585 | } | ||
586 | |||
587 | /* enable both Rx and Tx interrupts */ | ||
588 | custom.intena = IF_SETCLR | IF_RBF | IF_TBE; | ||
589 | mb(); | ||
590 | info->IER = UART_IER_MSI; | ||
591 | |||
592 | /* remember current state of the DCD and CTS bits */ | ||
593 | current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); | ||
594 | |||
595 | IRQ_ports = info; | ||
596 | |||
597 | info->MCR = 0; | ||
598 | if (info->tty->termios->c_cflag & CBAUD) | ||
599 | info->MCR = SER_DTR | SER_RTS; | ||
600 | rtsdtr_ctrl(info->MCR); | ||
601 | |||
602 | if (info->tty) | ||
603 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | ||
604 | info->xmit.head = info->xmit.tail = 0; | ||
605 | |||
606 | /* | ||
607 | * Set up the tty->alt_speed kludge | ||
608 | */ | ||
609 | if (info->tty) { | ||
610 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | ||
611 | info->tty->alt_speed = 57600; | ||
612 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | ||
613 | info->tty->alt_speed = 115200; | ||
614 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | ||
615 | info->tty->alt_speed = 230400; | ||
616 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | ||
617 | info->tty->alt_speed = 460800; | ||
618 | } | ||
619 | |||
620 | /* | ||
621 | * and set the speed of the serial port | ||
622 | */ | ||
623 | change_speed(info, NULL); | ||
624 | |||
625 | info->flags |= ASYNC_INITIALIZED; | ||
626 | local_irq_restore(flags); | ||
627 | return 0; | ||
628 | |||
629 | errout: | ||
630 | local_irq_restore(flags); | ||
631 | return retval; | ||
632 | } | ||
633 | |||
634 | /* | ||
635 | * This routine will shutdown a serial port; interrupts are disabled, and | ||
636 | * DTR is dropped if the hangup on close termio flag is on. | ||
637 | */ | ||
638 | static void shutdown(struct async_struct * info) | ||
639 | { | ||
640 | unsigned long flags; | ||
641 | struct serial_state *state; | ||
642 | |||
643 | if (!(info->flags & ASYNC_INITIALIZED)) | ||
644 | return; | ||
645 | |||
646 | state = info->state; | ||
647 | |||
648 | #ifdef SERIAL_DEBUG_OPEN | ||
649 | printk("Shutting down serial port %d ....\n", info->line); | ||
650 | #endif | ||
651 | |||
652 | local_irq_save(flags); /* Disable interrupts */ | ||
653 | |||
654 | /* | ||
655 | * clear delta_msr_wait queue to avoid mem leaks: we may free the irq | ||
656 | * here so the queue might never be waken up | ||
657 | */ | ||
658 | wake_up_interruptible(&info->delta_msr_wait); | ||
659 | |||
660 | IRQ_ports = NULL; | ||
661 | |||
662 | /* | ||
663 | * Free the IRQ, if necessary | ||
664 | */ | ||
665 | free_irq(IRQ_AMIGA_VERTB, info); | ||
666 | |||
667 | if (info->xmit.buf) { | ||
668 | free_page((unsigned long) info->xmit.buf); | ||
669 | info->xmit.buf = NULL; | ||
670 | } | ||
671 | |||
672 | info->IER = 0; | ||
673 | custom.intena = IF_RBF | IF_TBE; | ||
674 | mb(); | ||
675 | |||
676 | /* disable break condition */ | ||
677 | custom.adkcon = AC_UARTBRK; | ||
678 | mb(); | ||
679 | |||
680 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) | ||
681 | info->MCR &= ~(SER_DTR|SER_RTS); | ||
682 | rtsdtr_ctrl(info->MCR); | ||
683 | |||
684 | if (info->tty) | ||
685 | set_bit(TTY_IO_ERROR, &info->tty->flags); | ||
686 | |||
687 | info->flags &= ~ASYNC_INITIALIZED; | ||
688 | local_irq_restore(flags); | ||
689 | } | ||
690 | |||
691 | |||
692 | /* | ||
693 | * This routine is called to set the UART divisor registers to match | ||
694 | * the specified baud rate for a serial port. | ||
695 | */ | ||
696 | static void change_speed(struct async_struct *info, | ||
697 | struct ktermios *old_termios) | ||
698 | { | ||
699 | int quot = 0, baud_base, baud; | ||
700 | unsigned cflag, cval = 0; | ||
701 | int bits; | ||
702 | unsigned long flags; | ||
703 | |||
704 | if (!info->tty || !info->tty->termios) | ||
705 | return; | ||
706 | cflag = info->tty->termios->c_cflag; | ||
707 | |||
708 | /* Byte size is always 8 bits plus parity bit if requested */ | ||
709 | |||
710 | cval = 3; bits = 10; | ||
711 | if (cflag & CSTOPB) { | ||
712 | cval |= 0x04; | ||
713 | bits++; | ||
714 | } | ||
715 | if (cflag & PARENB) { | ||
716 | cval |= UART_LCR_PARITY; | ||
717 | bits++; | ||
718 | } | ||
719 | if (!(cflag & PARODD)) | ||
720 | cval |= UART_LCR_EPAR; | ||
721 | #ifdef CMSPAR | ||
722 | if (cflag & CMSPAR) | ||
723 | cval |= UART_LCR_SPAR; | ||
724 | #endif | ||
725 | |||
726 | /* Determine divisor based on baud rate */ | ||
727 | baud = tty_get_baud_rate(info->tty); | ||
728 | if (!baud) | ||
729 | baud = 9600; /* B0 transition handled in rs_set_termios */ | ||
730 | baud_base = info->state->baud_base; | ||
731 | if (baud == 38400 && | ||
732 | ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) | ||
733 | quot = info->state->custom_divisor; | ||
734 | else { | ||
735 | if (baud == 134) | ||
736 | /* Special case since 134 is really 134.5 */ | ||
737 | quot = (2*baud_base / 269); | ||
738 | else if (baud) | ||
739 | quot = baud_base / baud; | ||
740 | } | ||
741 | /* If the quotient is zero refuse the change */ | ||
742 | if (!quot && old_termios) { | ||
743 | /* FIXME: Will need updating for new tty in the end */ | ||
744 | info->tty->termios->c_cflag &= ~CBAUD; | ||
745 | info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD); | ||
746 | baud = tty_get_baud_rate(info->tty); | ||
747 | if (!baud) | ||
748 | baud = 9600; | ||
749 | if (baud == 38400 && | ||
750 | ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) | ||
751 | quot = info->state->custom_divisor; | ||
752 | else { | ||
753 | if (baud == 134) | ||
754 | /* Special case since 134 is really 134.5 */ | ||
755 | quot = (2*baud_base / 269); | ||
756 | else if (baud) | ||
757 | quot = baud_base / baud; | ||
758 | } | ||
759 | } | ||
760 | /* As a last resort, if the quotient is zero, default to 9600 bps */ | ||
761 | if (!quot) | ||
762 | quot = baud_base / 9600; | ||
763 | info->quot = quot; | ||
764 | info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); | ||
765 | info->timeout += HZ/50; /* Add .02 seconds of slop */ | ||
766 | |||
767 | /* CTS flow control flag and modem status interrupts */ | ||
768 | info->IER &= ~UART_IER_MSI; | ||
769 | if (info->flags & ASYNC_HARDPPS_CD) | ||
770 | info->IER |= UART_IER_MSI; | ||
771 | if (cflag & CRTSCTS) { | ||
772 | info->flags |= ASYNC_CTS_FLOW; | ||
773 | info->IER |= UART_IER_MSI; | ||
774 | } else | ||
775 | info->flags &= ~ASYNC_CTS_FLOW; | ||
776 | if (cflag & CLOCAL) | ||
777 | info->flags &= ~ASYNC_CHECK_CD; | ||
778 | else { | ||
779 | info->flags |= ASYNC_CHECK_CD; | ||
780 | info->IER |= UART_IER_MSI; | ||
781 | } | ||
782 | /* TBD: | ||
783 | * Does clearing IER_MSI imply that we should disable the VBL interrupt ? | ||
784 | */ | ||
785 | |||
786 | /* | ||
787 | * Set up parity check flag | ||
788 | */ | ||
789 | |||
790 | info->read_status_mask = UART_LSR_OE | UART_LSR_DR; | ||
791 | if (I_INPCK(info->tty)) | ||
792 | info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | ||
793 | if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) | ||
794 | info->read_status_mask |= UART_LSR_BI; | ||
795 | |||
796 | /* | ||
797 | * Characters to ignore | ||
798 | */ | ||
799 | info->ignore_status_mask = 0; | ||
800 | if (I_IGNPAR(info->tty)) | ||
801 | info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | ||
802 | if (I_IGNBRK(info->tty)) { | ||
803 | info->ignore_status_mask |= UART_LSR_BI; | ||
804 | /* | ||
805 | * If we're ignore parity and break indicators, ignore | ||
806 | * overruns too. (For real raw support). | ||
807 | */ | ||
808 | if (I_IGNPAR(info->tty)) | ||
809 | info->ignore_status_mask |= UART_LSR_OE; | ||
810 | } | ||
811 | /* | ||
812 | * !!! ignore all characters if CREAD is not set | ||
813 | */ | ||
814 | if ((cflag & CREAD) == 0) | ||
815 | info->ignore_status_mask |= UART_LSR_DR; | ||
816 | local_irq_save(flags); | ||
817 | |||
818 | { | ||
819 | short serper; | ||
820 | |||
821 | /* Set up the baud rate */ | ||
822 | serper = quot - 1; | ||
823 | |||
824 | /* Enable or disable parity bit */ | ||
825 | |||
826 | if(cval & UART_LCR_PARITY) | ||
827 | serper |= (SERPER_PARENB); | ||
828 | |||
829 | custom.serper = serper; | ||
830 | mb(); | ||
831 | } | ||
832 | |||
833 | info->LCR = cval; /* Save LCR */ | ||
834 | local_irq_restore(flags); | ||
835 | } | ||
836 | |||
837 | static int rs_put_char(struct tty_struct *tty, unsigned char ch) | ||
838 | { | ||
839 | struct async_struct *info; | ||
840 | unsigned long flags; | ||
841 | |||
842 | info = tty->driver_data; | ||
843 | |||
844 | if (serial_paranoia_check(info, tty->name, "rs_put_char")) | ||
845 | return 0; | ||
846 | |||
847 | if (!info->xmit.buf) | ||
848 | return 0; | ||
849 | |||
850 | local_irq_save(flags); | ||
851 | if (CIRC_SPACE(info->xmit.head, | ||
852 | info->xmit.tail, | ||
853 | SERIAL_XMIT_SIZE) == 0) { | ||
854 | local_irq_restore(flags); | ||
855 | return 0; | ||
856 | } | ||
857 | |||
858 | info->xmit.buf[info->xmit.head++] = ch; | ||
859 | info->xmit.head &= SERIAL_XMIT_SIZE-1; | ||
860 | local_irq_restore(flags); | ||
861 | return 1; | ||
862 | } | ||
863 | |||
864 | static void rs_flush_chars(struct tty_struct *tty) | ||
865 | { | ||
866 | struct async_struct *info = tty->driver_data; | ||
867 | unsigned long flags; | ||
868 | |||
869 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | ||
870 | return; | ||
871 | |||
872 | if (info->xmit.head == info->xmit.tail | ||
873 | || tty->stopped | ||
874 | || tty->hw_stopped | ||
875 | || !info->xmit.buf) | ||
876 | return; | ||
877 | |||
878 | local_irq_save(flags); | ||
879 | info->IER |= UART_IER_THRI; | ||
880 | custom.intena = IF_SETCLR | IF_TBE; | ||
881 | mb(); | ||
882 | /* set a pending Tx Interrupt, transmitter should restart now */ | ||
883 | custom.intreq = IF_SETCLR | IF_TBE; | ||
884 | mb(); | ||
885 | local_irq_restore(flags); | ||
886 | } | ||
887 | |||
888 | static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) | ||
889 | { | ||
890 | int c, ret = 0; | ||
891 | struct async_struct *info; | ||
892 | unsigned long flags; | ||
893 | |||
894 | info = tty->driver_data; | ||
895 | |||
896 | if (serial_paranoia_check(info, tty->name, "rs_write")) | ||
897 | return 0; | ||
898 | |||
899 | if (!info->xmit.buf) | ||
900 | return 0; | ||
901 | |||
902 | local_irq_save(flags); | ||
903 | while (1) { | ||
904 | c = CIRC_SPACE_TO_END(info->xmit.head, | ||
905 | info->xmit.tail, | ||
906 | SERIAL_XMIT_SIZE); | ||
907 | if (count < c) | ||
908 | c = count; | ||
909 | if (c <= 0) { | ||
910 | break; | ||
911 | } | ||
912 | memcpy(info->xmit.buf + info->xmit.head, buf, c); | ||
913 | info->xmit.head = ((info->xmit.head + c) & | ||
914 | (SERIAL_XMIT_SIZE-1)); | ||
915 | buf += c; | ||
916 | count -= c; | ||
917 | ret += c; | ||
918 | } | ||
919 | local_irq_restore(flags); | ||
920 | |||
921 | if (info->xmit.head != info->xmit.tail | ||
922 | && !tty->stopped | ||
923 | && !tty->hw_stopped | ||
924 | && !(info->IER & UART_IER_THRI)) { | ||
925 | info->IER |= UART_IER_THRI; | ||
926 | local_irq_disable(); | ||
927 | custom.intena = IF_SETCLR | IF_TBE; | ||
928 | mb(); | ||
929 | /* set a pending Tx Interrupt, transmitter should restart now */ | ||
930 | custom.intreq = IF_SETCLR | IF_TBE; | ||
931 | mb(); | ||
932 | local_irq_restore(flags); | ||
933 | } | ||
934 | return ret; | ||
935 | } | ||
936 | |||
937 | static int rs_write_room(struct tty_struct *tty) | ||
938 | { | ||
939 | struct async_struct *info = tty->driver_data; | ||
940 | |||
941 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | ||
942 | return 0; | ||
943 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | ||
944 | } | ||
945 | |||
946 | static int rs_chars_in_buffer(struct tty_struct *tty) | ||
947 | { | ||
948 | struct async_struct *info = tty->driver_data; | ||
949 | |||
950 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | ||
951 | return 0; | ||
952 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | ||
953 | } | ||
954 | |||
955 | static void rs_flush_buffer(struct tty_struct *tty) | ||
956 | { | ||
957 | struct async_struct *info = tty->driver_data; | ||
958 | unsigned long flags; | ||
959 | |||
960 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | ||
961 | return; | ||
962 | local_irq_save(flags); | ||
963 | info->xmit.head = info->xmit.tail = 0; | ||
964 | local_irq_restore(flags); | ||
965 | tty_wakeup(tty); | ||
966 | } | ||
967 | |||
968 | /* | ||
969 | * This function is used to send a high-priority XON/XOFF character to | ||
970 | * the device | ||
971 | */ | ||
972 | static void rs_send_xchar(struct tty_struct *tty, char ch) | ||
973 | { | ||
974 | struct async_struct *info = tty->driver_data; | ||
975 | unsigned long flags; | ||
976 | |||
977 | if (serial_paranoia_check(info, tty->name, "rs_send_char")) | ||
978 | return; | ||
979 | |||
980 | info->x_char = ch; | ||
981 | if (ch) { | ||
982 | /* Make sure transmit interrupts are on */ | ||
983 | |||
984 | /* Check this ! */ | ||
985 | local_irq_save(flags); | ||
986 | if(!(custom.intenar & IF_TBE)) { | ||
987 | custom.intena = IF_SETCLR | IF_TBE; | ||
988 | mb(); | ||
989 | /* set a pending Tx Interrupt, transmitter should restart now */ | ||
990 | custom.intreq = IF_SETCLR | IF_TBE; | ||
991 | mb(); | ||
992 | } | ||
993 | local_irq_restore(flags); | ||
994 | |||
995 | info->IER |= UART_IER_THRI; | ||
996 | } | ||
997 | } | ||
998 | |||
999 | /* | ||
1000 | * ------------------------------------------------------------ | ||
1001 | * rs_throttle() | ||
1002 | * | ||
1003 | * This routine is called by the upper-layer tty layer to signal that | ||
1004 | * incoming characters should be throttled. | ||
1005 | * ------------------------------------------------------------ | ||
1006 | */ | ||
1007 | static void rs_throttle(struct tty_struct * tty) | ||
1008 | { | ||
1009 | struct async_struct *info = tty->driver_data; | ||
1010 | unsigned long flags; | ||
1011 | #ifdef SERIAL_DEBUG_THROTTLE | ||
1012 | char buf[64]; | ||
1013 | |||
1014 | printk("throttle %s: %d....\n", tty_name(tty, buf), | ||
1015 | tty->ldisc.chars_in_buffer(tty)); | ||
1016 | #endif | ||
1017 | |||
1018 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | ||
1019 | return; | ||
1020 | |||
1021 | if (I_IXOFF(tty)) | ||
1022 | rs_send_xchar(tty, STOP_CHAR(tty)); | ||
1023 | |||
1024 | if (tty->termios->c_cflag & CRTSCTS) | ||
1025 | info->MCR &= ~SER_RTS; | ||
1026 | |||
1027 | local_irq_save(flags); | ||
1028 | rtsdtr_ctrl(info->MCR); | ||
1029 | local_irq_restore(flags); | ||
1030 | } | ||
1031 | |||
1032 | static void rs_unthrottle(struct tty_struct * tty) | ||
1033 | { | ||
1034 | struct async_struct *info = tty->driver_data; | ||
1035 | unsigned long flags; | ||
1036 | #ifdef SERIAL_DEBUG_THROTTLE | ||
1037 | char buf[64]; | ||
1038 | |||
1039 | printk("unthrottle %s: %d....\n", tty_name(tty, buf), | ||
1040 | tty->ldisc.chars_in_buffer(tty)); | ||
1041 | #endif | ||
1042 | |||
1043 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | ||
1044 | return; | ||
1045 | |||
1046 | if (I_IXOFF(tty)) { | ||
1047 | if (info->x_char) | ||
1048 | info->x_char = 0; | ||
1049 | else | ||
1050 | rs_send_xchar(tty, START_CHAR(tty)); | ||
1051 | } | ||
1052 | if (tty->termios->c_cflag & CRTSCTS) | ||
1053 | info->MCR |= SER_RTS; | ||
1054 | local_irq_save(flags); | ||
1055 | rtsdtr_ctrl(info->MCR); | ||
1056 | local_irq_restore(flags); | ||
1057 | } | ||
1058 | |||
1059 | /* | ||
1060 | * ------------------------------------------------------------ | ||
1061 | * rs_ioctl() and friends | ||
1062 | * ------------------------------------------------------------ | ||
1063 | */ | ||
1064 | |||
1065 | static int get_serial_info(struct async_struct * info, | ||
1066 | struct serial_struct __user * retinfo) | ||
1067 | { | ||
1068 | struct serial_struct tmp; | ||
1069 | struct serial_state *state = info->state; | ||
1070 | |||
1071 | if (!retinfo) | ||
1072 | return -EFAULT; | ||
1073 | memset(&tmp, 0, sizeof(tmp)); | ||
1074 | tty_lock(); | ||
1075 | tmp.type = state->type; | ||
1076 | tmp.line = state->line; | ||
1077 | tmp.port = state->port; | ||
1078 | tmp.irq = state->irq; | ||
1079 | tmp.flags = state->flags; | ||
1080 | tmp.xmit_fifo_size = state->xmit_fifo_size; | ||
1081 | tmp.baud_base = state->baud_base; | ||
1082 | tmp.close_delay = state->close_delay; | ||
1083 | tmp.closing_wait = state->closing_wait; | ||
1084 | tmp.custom_divisor = state->custom_divisor; | ||
1085 | tty_unlock(); | ||
1086 | if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) | ||
1087 | return -EFAULT; | ||
1088 | return 0; | ||
1089 | } | ||
1090 | |||
1091 | static int set_serial_info(struct async_struct * info, | ||
1092 | struct serial_struct __user * new_info) | ||
1093 | { | ||
1094 | struct serial_struct new_serial; | ||
1095 | struct serial_state old_state, *state; | ||
1096 | unsigned int change_irq,change_port; | ||
1097 | int retval = 0; | ||
1098 | |||
1099 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) | ||
1100 | return -EFAULT; | ||
1101 | |||
1102 | tty_lock(); | ||
1103 | state = info->state; | ||
1104 | old_state = *state; | ||
1105 | |||
1106 | change_irq = new_serial.irq != state->irq; | ||
1107 | change_port = (new_serial.port != state->port); | ||
1108 | if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) { | ||
1109 | tty_unlock(); | ||
1110 | return -EINVAL; | ||
1111 | } | ||
1112 | |||
1113 | if (!serial_isroot()) { | ||
1114 | if ((new_serial.baud_base != state->baud_base) || | ||
1115 | (new_serial.close_delay != state->close_delay) || | ||
1116 | (new_serial.xmit_fifo_size != state->xmit_fifo_size) || | ||
1117 | ((new_serial.flags & ~ASYNC_USR_MASK) != | ||
1118 | (state->flags & ~ASYNC_USR_MASK))) | ||
1119 | return -EPERM; | ||
1120 | state->flags = ((state->flags & ~ASYNC_USR_MASK) | | ||
1121 | (new_serial.flags & ASYNC_USR_MASK)); | ||
1122 | info->flags = ((info->flags & ~ASYNC_USR_MASK) | | ||
1123 | (new_serial.flags & ASYNC_USR_MASK)); | ||
1124 | state->custom_divisor = new_serial.custom_divisor; | ||
1125 | goto check_and_exit; | ||
1126 | } | ||
1127 | |||
1128 | if (new_serial.baud_base < 9600) { | ||
1129 | tty_unlock(); | ||
1130 | return -EINVAL; | ||
1131 | } | ||
1132 | |||
1133 | /* | ||
1134 | * OK, past this point, all the error checking has been done. | ||
1135 | * At this point, we start making changes..... | ||
1136 | */ | ||
1137 | |||
1138 | state->baud_base = new_serial.baud_base; | ||
1139 | state->flags = ((state->flags & ~ASYNC_FLAGS) | | ||
1140 | (new_serial.flags & ASYNC_FLAGS)); | ||
1141 | info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) | | ||
1142 | (info->flags & ASYNC_INTERNAL_FLAGS)); | ||
1143 | state->custom_divisor = new_serial.custom_divisor; | ||
1144 | state->close_delay = new_serial.close_delay * HZ/100; | ||
1145 | state->closing_wait = new_serial.closing_wait * HZ/100; | ||
1146 | info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; | ||
1147 | |||
1148 | check_and_exit: | ||
1149 | if (info->flags & ASYNC_INITIALIZED) { | ||
1150 | if (((old_state.flags & ASYNC_SPD_MASK) != | ||
1151 | (state->flags & ASYNC_SPD_MASK)) || | ||
1152 | (old_state.custom_divisor != state->custom_divisor)) { | ||
1153 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | ||
1154 | info->tty->alt_speed = 57600; | ||
1155 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | ||
1156 | info->tty->alt_speed = 115200; | ||
1157 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | ||
1158 | info->tty->alt_speed = 230400; | ||
1159 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | ||
1160 | info->tty->alt_speed = 460800; | ||
1161 | change_speed(info, NULL); | ||
1162 | } | ||
1163 | } else | ||
1164 | retval = startup(info); | ||
1165 | tty_unlock(); | ||
1166 | return retval; | ||
1167 | } | ||
1168 | |||
1169 | |||
1170 | /* | ||
1171 | * get_lsr_info - get line status register info | ||
1172 | * | ||
1173 | * Purpose: Let user call ioctl() to get info when the UART physically | ||
1174 | * is emptied. On bus types like RS485, the transmitter must | ||
1175 | * release the bus after transmitting. This must be done when | ||
1176 | * the transmit shift register is empty, not be done when the | ||
1177 | * transmit holding register is empty. This functionality | ||
1178 | * allows an RS485 driver to be written in user space. | ||
1179 | */ | ||
1180 | static int get_lsr_info(struct async_struct * info, unsigned int __user *value) | ||
1181 | { | ||
1182 | unsigned char status; | ||
1183 | unsigned int result; | ||
1184 | unsigned long flags; | ||
1185 | |||
1186 | local_irq_save(flags); | ||
1187 | status = custom.serdatr; | ||
1188 | mb(); | ||
1189 | local_irq_restore(flags); | ||
1190 | result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); | ||
1191 | if (copy_to_user(value, &result, sizeof(int))) | ||
1192 | return -EFAULT; | ||
1193 | return 0; | ||
1194 | } | ||
1195 | |||
1196 | |||
1197 | static int rs_tiocmget(struct tty_struct *tty, struct file *file) | ||
1198 | { | ||
1199 | struct async_struct * info = tty->driver_data; | ||
1200 | unsigned char control, status; | ||
1201 | unsigned long flags; | ||
1202 | |||
1203 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | ||
1204 | return -ENODEV; | ||
1205 | if (tty->flags & (1 << TTY_IO_ERROR)) | ||
1206 | return -EIO; | ||
1207 | |||
1208 | control = info->MCR; | ||
1209 | local_irq_save(flags); | ||
1210 | status = ciab.pra; | ||
1211 | local_irq_restore(flags); | ||
1212 | return ((control & SER_RTS) ? TIOCM_RTS : 0) | ||
1213 | | ((control & SER_DTR) ? TIOCM_DTR : 0) | ||
1214 | | (!(status & SER_DCD) ? TIOCM_CAR : 0) | ||
1215 | | (!(status & SER_DSR) ? TIOCM_DSR : 0) | ||
1216 | | (!(status & SER_CTS) ? TIOCM_CTS : 0); | ||
1217 | } | ||
1218 | |||
1219 | static int rs_tiocmset(struct tty_struct *tty, struct file *file, | ||
1220 | unsigned int set, unsigned int clear) | ||
1221 | { | ||
1222 | struct async_struct * info = tty->driver_data; | ||
1223 | unsigned long flags; | ||
1224 | |||
1225 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | ||
1226 | return -ENODEV; | ||
1227 | if (tty->flags & (1 << TTY_IO_ERROR)) | ||
1228 | return -EIO; | ||
1229 | |||
1230 | local_irq_save(flags); | ||
1231 | if (set & TIOCM_RTS) | ||
1232 | info->MCR |= SER_RTS; | ||
1233 | if (set & TIOCM_DTR) | ||
1234 | info->MCR |= SER_DTR; | ||
1235 | if (clear & TIOCM_RTS) | ||
1236 | info->MCR &= ~SER_RTS; | ||
1237 | if (clear & TIOCM_DTR) | ||
1238 | info->MCR &= ~SER_DTR; | ||
1239 | rtsdtr_ctrl(info->MCR); | ||
1240 | local_irq_restore(flags); | ||
1241 | return 0; | ||
1242 | } | ||
1243 | |||
1244 | /* | ||
1245 | * rs_break() --- routine which turns the break handling on or off | ||
1246 | */ | ||
1247 | static int rs_break(struct tty_struct *tty, int break_state) | ||
1248 | { | ||
1249 | struct async_struct * info = tty->driver_data; | ||
1250 | unsigned long flags; | ||
1251 | |||
1252 | if (serial_paranoia_check(info, tty->name, "rs_break")) | ||
1253 | return -EINVAL; | ||
1254 | |||
1255 | local_irq_save(flags); | ||
1256 | if (break_state == -1) | ||
1257 | custom.adkcon = AC_SETCLR | AC_UARTBRK; | ||
1258 | else | ||
1259 | custom.adkcon = AC_UARTBRK; | ||
1260 | mb(); | ||
1261 | local_irq_restore(flags); | ||
1262 | return 0; | ||
1263 | } | ||
1264 | |||
1265 | /* | ||
1266 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | ||
1267 | * Return: write counters to the user passed counter struct | ||
1268 | * NB: both 1->0 and 0->1 transitions are counted except for | ||
1269 | * RI where only 0->1 is counted. | ||
1270 | */ | ||
1271 | static int rs_get_icount(struct tty_struct *tty, | ||
1272 | struct serial_icounter_struct *icount) | ||
1273 | { | ||
1274 | struct async_struct *info = tty->driver_data; | ||
1275 | struct async_icount cnow; | ||
1276 | unsigned long flags; | ||
1277 | |||
1278 | local_irq_save(flags); | ||
1279 | cnow = info->state->icount; | ||
1280 | local_irq_restore(flags); | ||
1281 | icount->cts = cnow.cts; | ||
1282 | icount->dsr = cnow.dsr; | ||
1283 | icount->rng = cnow.rng; | ||
1284 | icount->dcd = cnow.dcd; | ||
1285 | icount->rx = cnow.rx; | ||
1286 | icount->tx = cnow.tx; | ||
1287 | icount->frame = cnow.frame; | ||
1288 | icount->overrun = cnow.overrun; | ||
1289 | icount->parity = cnow.parity; | ||
1290 | icount->brk = cnow.brk; | ||
1291 | icount->buf_overrun = cnow.buf_overrun; | ||
1292 | |||
1293 | return 0; | ||
1294 | } | ||
1295 | |||
1296 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | ||
1297 | unsigned int cmd, unsigned long arg) | ||
1298 | { | ||
1299 | struct async_struct * info = tty->driver_data; | ||
1300 | struct async_icount cprev, cnow; /* kernel counter temps */ | ||
1301 | void __user *argp = (void __user *)arg; | ||
1302 | unsigned long flags; | ||
1303 | |||
1304 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | ||
1305 | return -ENODEV; | ||
1306 | |||
1307 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | ||
1308 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && | ||
1309 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { | ||
1310 | if (tty->flags & (1 << TTY_IO_ERROR)) | ||
1311 | return -EIO; | ||
1312 | } | ||
1313 | |||
1314 | switch (cmd) { | ||
1315 | case TIOCGSERIAL: | ||
1316 | return get_serial_info(info, argp); | ||
1317 | case TIOCSSERIAL: | ||
1318 | return set_serial_info(info, argp); | ||
1319 | case TIOCSERCONFIG: | ||
1320 | return 0; | ||
1321 | |||
1322 | case TIOCSERGETLSR: /* Get line status register */ | ||
1323 | return get_lsr_info(info, argp); | ||
1324 | |||
1325 | case TIOCSERGSTRUCT: | ||
1326 | if (copy_to_user(argp, | ||
1327 | info, sizeof(struct async_struct))) | ||
1328 | return -EFAULT; | ||
1329 | return 0; | ||
1330 | |||
1331 | /* | ||
1332 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | ||
1333 | * - mask passed in arg for lines of interest | ||
1334 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | ||
1335 | * Caller should use TIOCGICOUNT to see which one it was | ||
1336 | */ | ||
1337 | case TIOCMIWAIT: | ||
1338 | local_irq_save(flags); | ||
1339 | /* note the counters on entry */ | ||
1340 | cprev = info->state->icount; | ||
1341 | local_irq_restore(flags); | ||
1342 | while (1) { | ||
1343 | interruptible_sleep_on(&info->delta_msr_wait); | ||
1344 | /* see if a signal did it */ | ||
1345 | if (signal_pending(current)) | ||
1346 | return -ERESTARTSYS; | ||
1347 | local_irq_save(flags); | ||
1348 | cnow = info->state->icount; /* atomic copy */ | ||
1349 | local_irq_restore(flags); | ||
1350 | if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && | ||
1351 | cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) | ||
1352 | return -EIO; /* no change => error */ | ||
1353 | if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | ||
1354 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | ||
1355 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | ||
1356 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { | ||
1357 | return 0; | ||
1358 | } | ||
1359 | cprev = cnow; | ||
1360 | } | ||
1361 | /* NOTREACHED */ | ||
1362 | |||
1363 | case TIOCSERGWILD: | ||
1364 | case TIOCSERSWILD: | ||
1365 | /* "setserial -W" is called in Debian boot */ | ||
1366 | printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); | ||
1367 | return 0; | ||
1368 | |||
1369 | default: | ||
1370 | return -ENOIOCTLCMD; | ||
1371 | } | ||
1372 | return 0; | ||
1373 | } | ||
1374 | |||
1375 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) | ||
1376 | { | ||
1377 | struct async_struct *info = tty->driver_data; | ||
1378 | unsigned long flags; | ||
1379 | unsigned int cflag = tty->termios->c_cflag; | ||
1380 | |||
1381 | change_speed(info, old_termios); | ||
1382 | |||
1383 | /* Handle transition to B0 status */ | ||
1384 | if ((old_termios->c_cflag & CBAUD) && | ||
1385 | !(cflag & CBAUD)) { | ||
1386 | info->MCR &= ~(SER_DTR|SER_RTS); | ||
1387 | local_irq_save(flags); | ||
1388 | rtsdtr_ctrl(info->MCR); | ||
1389 | local_irq_restore(flags); | ||
1390 | } | ||
1391 | |||
1392 | /* Handle transition away from B0 status */ | ||
1393 | if (!(old_termios->c_cflag & CBAUD) && | ||
1394 | (cflag & CBAUD)) { | ||
1395 | info->MCR |= SER_DTR; | ||
1396 | if (!(tty->termios->c_cflag & CRTSCTS) || | ||
1397 | !test_bit(TTY_THROTTLED, &tty->flags)) { | ||
1398 | info->MCR |= SER_RTS; | ||
1399 | } | ||
1400 | local_irq_save(flags); | ||
1401 | rtsdtr_ctrl(info->MCR); | ||
1402 | local_irq_restore(flags); | ||
1403 | } | ||
1404 | |||
1405 | /* Handle turning off CRTSCTS */ | ||
1406 | if ((old_termios->c_cflag & CRTSCTS) && | ||
1407 | !(tty->termios->c_cflag & CRTSCTS)) { | ||
1408 | tty->hw_stopped = 0; | ||
1409 | rs_start(tty); | ||
1410 | } | ||
1411 | |||
1412 | #if 0 | ||
1413 | /* | ||
1414 | * No need to wake up processes in open wait, since they | ||
1415 | * sample the CLOCAL flag once, and don't recheck it. | ||
1416 | * XXX It's not clear whether the current behavior is correct | ||
1417 | * or not. Hence, this may change..... | ||
1418 | */ | ||
1419 | if (!(old_termios->c_cflag & CLOCAL) && | ||
1420 | (tty->termios->c_cflag & CLOCAL)) | ||
1421 | wake_up_interruptible(&info->open_wait); | ||
1422 | #endif | ||
1423 | } | ||
1424 | |||
1425 | /* | ||
1426 | * ------------------------------------------------------------ | ||
1427 | * rs_close() | ||
1428 | * | ||
1429 | * This routine is called when the serial port gets closed. First, we | ||
1430 | * wait for the last remaining data to be sent. Then, we unlink its | ||
1431 | * async structure from the interrupt chain if necessary, and we free | ||
1432 | * that IRQ if nothing is left in the chain. | ||
1433 | * ------------------------------------------------------------ | ||
1434 | */ | ||
1435 | static void rs_close(struct tty_struct *tty, struct file * filp) | ||
1436 | { | ||
1437 | struct async_struct * info = tty->driver_data; | ||
1438 | struct serial_state *state; | ||
1439 | unsigned long flags; | ||
1440 | |||
1441 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | ||
1442 | return; | ||
1443 | |||
1444 | state = info->state; | ||
1445 | |||
1446 | local_irq_save(flags); | ||
1447 | |||
1448 | if (tty_hung_up_p(filp)) { | ||
1449 | DBG_CNT("before DEC-hung"); | ||
1450 | local_irq_restore(flags); | ||
1451 | return; | ||
1452 | } | ||
1453 | |||
1454 | #ifdef SERIAL_DEBUG_OPEN | ||
1455 | printk("rs_close ttys%d, count = %d\n", info->line, state->count); | ||
1456 | #endif | ||
1457 | if ((tty->count == 1) && (state->count != 1)) { | ||
1458 | /* | ||
1459 | * Uh, oh. tty->count is 1, which means that the tty | ||
1460 | * structure will be freed. state->count should always | ||
1461 | * be one in these conditions. If it's greater than | ||
1462 | * one, we've got real problems, since it means the | ||
1463 | * serial port won't be shutdown. | ||
1464 | */ | ||
1465 | printk("rs_close: bad serial port count; tty->count is 1, " | ||
1466 | "state->count is %d\n", state->count); | ||
1467 | state->count = 1; | ||
1468 | } | ||
1469 | if (--state->count < 0) { | ||
1470 | printk("rs_close: bad serial port count for ttys%d: %d\n", | ||
1471 | info->line, state->count); | ||
1472 | state->count = 0; | ||
1473 | } | ||
1474 | if (state->count) { | ||
1475 | DBG_CNT("before DEC-2"); | ||
1476 | local_irq_restore(flags); | ||
1477 | return; | ||
1478 | } | ||
1479 | info->flags |= ASYNC_CLOSING; | ||
1480 | /* | ||
1481 | * Now we wait for the transmit buffer to clear; and we notify | ||
1482 | * the line discipline to only process XON/XOFF characters. | ||
1483 | */ | ||
1484 | tty->closing = 1; | ||
1485 | if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) | ||
1486 | tty_wait_until_sent(tty, info->closing_wait); | ||
1487 | /* | ||
1488 | * At this point we stop accepting input. To do this, we | ||
1489 | * disable the receive line status interrupts, and tell the | ||
1490 | * interrupt driver to stop checking the data ready bit in the | ||
1491 | * line status register. | ||
1492 | */ | ||
1493 | info->read_status_mask &= ~UART_LSR_DR; | ||
1494 | if (info->flags & ASYNC_INITIALIZED) { | ||
1495 | /* disable receive interrupts */ | ||
1496 | custom.intena = IF_RBF; | ||
1497 | mb(); | ||
1498 | /* clear any pending receive interrupt */ | ||
1499 | custom.intreq = IF_RBF; | ||
1500 | mb(); | ||
1501 | |||
1502 | /* | ||
1503 | * Before we drop DTR, make sure the UART transmitter | ||
1504 | * has completely drained; this is especially | ||
1505 | * important if there is a transmit FIFO! | ||
1506 | */ | ||
1507 | rs_wait_until_sent(tty, info->timeout); | ||
1508 | } | ||
1509 | shutdown(info); | ||
1510 | rs_flush_buffer(tty); | ||
1511 | |||
1512 | tty_ldisc_flush(tty); | ||
1513 | tty->closing = 0; | ||
1514 | info->event = 0; | ||
1515 | info->tty = NULL; | ||
1516 | if (info->blocked_open) { | ||
1517 | if (info->close_delay) { | ||
1518 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | ||
1519 | } | ||
1520 | wake_up_interruptible(&info->open_wait); | ||
1521 | } | ||
1522 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | ||
1523 | wake_up_interruptible(&info->close_wait); | ||
1524 | local_irq_restore(flags); | ||
1525 | } | ||
1526 | |||
1527 | /* | ||
1528 | * rs_wait_until_sent() --- wait until the transmitter is empty | ||
1529 | */ | ||
1530 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | ||
1531 | { | ||
1532 | struct async_struct * info = tty->driver_data; | ||
1533 | unsigned long orig_jiffies, char_time; | ||
1534 | int tty_was_locked = tty_locked(); | ||
1535 | int lsr; | ||
1536 | |||
1537 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) | ||
1538 | return; | ||
1539 | |||
1540 | if (info->xmit_fifo_size == 0) | ||
1541 | return; /* Just in case.... */ | ||
1542 | |||
1543 | orig_jiffies = jiffies; | ||
1544 | |||
1545 | /* | ||
1546 | * tty_wait_until_sent is called from lots of places, | ||
1547 | * with or without the BTM. | ||
1548 | */ | ||
1549 | if (!tty_was_locked) | ||
1550 | tty_lock(); | ||
1551 | /* | ||
1552 | * Set the check interval to be 1/5 of the estimated time to | ||
1553 | * send a single character, and make it at least 1. The check | ||
1554 | * interval should also be less than the timeout. | ||
1555 | * | ||
1556 | * Note: we have to use pretty tight timings here to satisfy | ||
1557 | * the NIST-PCTS. | ||
1558 | */ | ||
1559 | char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; | ||
1560 | char_time = char_time / 5; | ||
1561 | if (char_time == 0) | ||
1562 | char_time = 1; | ||
1563 | if (timeout) | ||
1564 | char_time = min_t(unsigned long, char_time, timeout); | ||
1565 | /* | ||
1566 | * If the transmitter hasn't cleared in twice the approximate | ||
1567 | * amount of time to send the entire FIFO, it probably won't | ||
1568 | * ever clear. This assumes the UART isn't doing flow | ||
1569 | * control, which is currently the case. Hence, if it ever | ||
1570 | * takes longer than info->timeout, this is probably due to a | ||
1571 | * UART bug of some kind. So, we clamp the timeout parameter at | ||
1572 | * 2*info->timeout. | ||
1573 | */ | ||
1574 | if (!timeout || timeout > 2*info->timeout) | ||
1575 | timeout = 2*info->timeout; | ||
1576 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | ||
1577 | printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); | ||
1578 | printk("jiff=%lu...", jiffies); | ||
1579 | #endif | ||
1580 | while(!((lsr = custom.serdatr) & SDR_TSRE)) { | ||
1581 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | ||
1582 | printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); | ||
1583 | #endif | ||
1584 | msleep_interruptible(jiffies_to_msecs(char_time)); | ||
1585 | if (signal_pending(current)) | ||
1586 | break; | ||
1587 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | ||
1588 | break; | ||
1589 | } | ||
1590 | __set_current_state(TASK_RUNNING); | ||
1591 | if (!tty_was_locked) | ||
1592 | tty_unlock(); | ||
1593 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | ||
1594 | printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); | ||
1595 | #endif | ||
1596 | } | ||
1597 | |||
1598 | /* | ||
1599 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | ||
1600 | */ | ||
1601 | static void rs_hangup(struct tty_struct *tty) | ||
1602 | { | ||
1603 | struct async_struct * info = tty->driver_data; | ||
1604 | struct serial_state *state = info->state; | ||
1605 | |||
1606 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | ||
1607 | return; | ||
1608 | |||
1609 | state = info->state; | ||
1610 | |||
1611 | rs_flush_buffer(tty); | ||
1612 | shutdown(info); | ||
1613 | info->event = 0; | ||
1614 | state->count = 0; | ||
1615 | info->flags &= ~ASYNC_NORMAL_ACTIVE; | ||
1616 | info->tty = NULL; | ||
1617 | wake_up_interruptible(&info->open_wait); | ||
1618 | } | ||
1619 | |||
1620 | /* | ||
1621 | * ------------------------------------------------------------ | ||
1622 | * rs_open() and friends | ||
1623 | * ------------------------------------------------------------ | ||
1624 | */ | ||
1625 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | ||
1626 | struct async_struct *info) | ||
1627 | { | ||
1628 | #ifdef DECLARE_WAITQUEUE | ||
1629 | DECLARE_WAITQUEUE(wait, current); | ||
1630 | #else | ||
1631 | struct wait_queue wait = { current, NULL }; | ||
1632 | #endif | ||
1633 | struct serial_state *state = info->state; | ||
1634 | int retval; | ||
1635 | int do_clocal = 0, extra_count = 0; | ||
1636 | unsigned long flags; | ||
1637 | |||
1638 | /* | ||
1639 | * If the device is in the middle of being closed, then block | ||
1640 | * until it's done, and then try again. | ||
1641 | */ | ||
1642 | if (tty_hung_up_p(filp) || | ||
1643 | (info->flags & ASYNC_CLOSING)) { | ||
1644 | if (info->flags & ASYNC_CLOSING) | ||
1645 | interruptible_sleep_on(&info->close_wait); | ||
1646 | #ifdef SERIAL_DO_RESTART | ||
1647 | return ((info->flags & ASYNC_HUP_NOTIFY) ? | ||
1648 | -EAGAIN : -ERESTARTSYS); | ||
1649 | #else | ||
1650 | return -EAGAIN; | ||
1651 | #endif | ||
1652 | } | ||
1653 | |||
1654 | /* | ||
1655 | * If non-blocking mode is set, or the port is not enabled, | ||
1656 | * then make the check up front and then exit. | ||
1657 | */ | ||
1658 | if ((filp->f_flags & O_NONBLOCK) || | ||
1659 | (tty->flags & (1 << TTY_IO_ERROR))) { | ||
1660 | info->flags |= ASYNC_NORMAL_ACTIVE; | ||
1661 | return 0; | ||
1662 | } | ||
1663 | |||
1664 | if (tty->termios->c_cflag & CLOCAL) | ||
1665 | do_clocal = 1; | ||
1666 | |||
1667 | /* | ||
1668 | * Block waiting for the carrier detect and the line to become | ||
1669 | * free (i.e., not in use by the callout). While we are in | ||
1670 | * this loop, state->count is dropped by one, so that | ||
1671 | * rs_close() knows when to free things. We restore it upon | ||
1672 | * exit, either normal or abnormal. | ||
1673 | */ | ||
1674 | retval = 0; | ||
1675 | add_wait_queue(&info->open_wait, &wait); | ||
1676 | #ifdef SERIAL_DEBUG_OPEN | ||
1677 | printk("block_til_ready before block: ttys%d, count = %d\n", | ||
1678 | state->line, state->count); | ||
1679 | #endif | ||
1680 | local_irq_save(flags); | ||
1681 | if (!tty_hung_up_p(filp)) { | ||
1682 | extra_count = 1; | ||
1683 | state->count--; | ||
1684 | } | ||
1685 | local_irq_restore(flags); | ||
1686 | info->blocked_open++; | ||
1687 | while (1) { | ||
1688 | local_irq_save(flags); | ||
1689 | if (tty->termios->c_cflag & CBAUD) | ||
1690 | rtsdtr_ctrl(SER_DTR|SER_RTS); | ||
1691 | local_irq_restore(flags); | ||
1692 | set_current_state(TASK_INTERRUPTIBLE); | ||
1693 | if (tty_hung_up_p(filp) || | ||
1694 | !(info->flags & ASYNC_INITIALIZED)) { | ||
1695 | #ifdef SERIAL_DO_RESTART | ||
1696 | if (info->flags & ASYNC_HUP_NOTIFY) | ||
1697 | retval = -EAGAIN; | ||
1698 | else | ||
1699 | retval = -ERESTARTSYS; | ||
1700 | #else | ||
1701 | retval = -EAGAIN; | ||
1702 | #endif | ||
1703 | break; | ||
1704 | } | ||
1705 | if (!(info->flags & ASYNC_CLOSING) && | ||
1706 | (do_clocal || (!(ciab.pra & SER_DCD)) )) | ||
1707 | break; | ||
1708 | if (signal_pending(current)) { | ||
1709 | retval = -ERESTARTSYS; | ||
1710 | break; | ||
1711 | } | ||
1712 | #ifdef SERIAL_DEBUG_OPEN | ||
1713 | printk("block_til_ready blocking: ttys%d, count = %d\n", | ||
1714 | info->line, state->count); | ||
1715 | #endif | ||
1716 | tty_unlock(); | ||
1717 | schedule(); | ||
1718 | tty_lock(); | ||
1719 | } | ||
1720 | __set_current_state(TASK_RUNNING); | ||
1721 | remove_wait_queue(&info->open_wait, &wait); | ||
1722 | if (extra_count) | ||
1723 | state->count++; | ||
1724 | info->blocked_open--; | ||
1725 | #ifdef SERIAL_DEBUG_OPEN | ||
1726 | printk("block_til_ready after blocking: ttys%d, count = %d\n", | ||
1727 | info->line, state->count); | ||
1728 | #endif | ||
1729 | if (retval) | ||
1730 | return retval; | ||
1731 | info->flags |= ASYNC_NORMAL_ACTIVE; | ||
1732 | return 0; | ||
1733 | } | ||
1734 | |||
1735 | static int get_async_struct(int line, struct async_struct **ret_info) | ||
1736 | { | ||
1737 | struct async_struct *info; | ||
1738 | struct serial_state *sstate; | ||
1739 | |||
1740 | sstate = rs_table + line; | ||
1741 | sstate->count++; | ||
1742 | if (sstate->info) { | ||
1743 | *ret_info = sstate->info; | ||
1744 | return 0; | ||
1745 | } | ||
1746 | info = kzalloc(sizeof(struct async_struct), GFP_KERNEL); | ||
1747 | if (!info) { | ||
1748 | sstate->count--; | ||
1749 | return -ENOMEM; | ||
1750 | } | ||
1751 | #ifdef DECLARE_WAITQUEUE | ||
1752 | init_waitqueue_head(&info->open_wait); | ||
1753 | init_waitqueue_head(&info->close_wait); | ||
1754 | init_waitqueue_head(&info->delta_msr_wait); | ||
1755 | #endif | ||
1756 | info->magic = SERIAL_MAGIC; | ||
1757 | info->port = sstate->port; | ||
1758 | info->flags = sstate->flags; | ||
1759 | info->xmit_fifo_size = sstate->xmit_fifo_size; | ||
1760 | info->line = line; | ||
1761 | tasklet_init(&info->tlet, do_softint, (unsigned long)info); | ||
1762 | info->state = sstate; | ||
1763 | if (sstate->info) { | ||
1764 | kfree(info); | ||
1765 | *ret_info = sstate->info; | ||
1766 | return 0; | ||
1767 | } | ||
1768 | *ret_info = sstate->info = info; | ||
1769 | return 0; | ||
1770 | } | ||
1771 | |||
1772 | /* | ||
1773 | * This routine is called whenever a serial port is opened. It | ||
1774 | * enables interrupts for a serial port, linking in its async structure into | ||
1775 | * the IRQ chain. It also performs the serial-specific | ||
1776 | * initialization for the tty structure. | ||
1777 | */ | ||
1778 | static int rs_open(struct tty_struct *tty, struct file * filp) | ||
1779 | { | ||
1780 | struct async_struct *info; | ||
1781 | int retval, line; | ||
1782 | |||
1783 | line = tty->index; | ||
1784 | if ((line < 0) || (line >= NR_PORTS)) { | ||
1785 | return -ENODEV; | ||
1786 | } | ||
1787 | retval = get_async_struct(line, &info); | ||
1788 | if (retval) { | ||
1789 | return retval; | ||
1790 | } | ||
1791 | tty->driver_data = info; | ||
1792 | info->tty = tty; | ||
1793 | if (serial_paranoia_check(info, tty->name, "rs_open")) | ||
1794 | return -ENODEV; | ||
1795 | |||
1796 | #ifdef SERIAL_DEBUG_OPEN | ||
1797 | printk("rs_open %s, count = %d\n", tty->name, info->state->count); | ||
1798 | #endif | ||
1799 | info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; | ||
1800 | |||
1801 | /* | ||
1802 | * If the port is the middle of closing, bail out now | ||
1803 | */ | ||
1804 | if (tty_hung_up_p(filp) || | ||
1805 | (info->flags & ASYNC_CLOSING)) { | ||
1806 | if (info->flags & ASYNC_CLOSING) | ||
1807 | interruptible_sleep_on(&info->close_wait); | ||
1808 | #ifdef SERIAL_DO_RESTART | ||
1809 | return ((info->flags & ASYNC_HUP_NOTIFY) ? | ||
1810 | -EAGAIN : -ERESTARTSYS); | ||
1811 | #else | ||
1812 | return -EAGAIN; | ||
1813 | #endif | ||
1814 | } | ||
1815 | |||
1816 | /* | ||
1817 | * Start up serial port | ||
1818 | */ | ||
1819 | retval = startup(info); | ||
1820 | if (retval) { | ||
1821 | return retval; | ||
1822 | } | ||
1823 | |||
1824 | retval = block_til_ready(tty, filp, info); | ||
1825 | if (retval) { | ||
1826 | #ifdef SERIAL_DEBUG_OPEN | ||
1827 | printk("rs_open returning after block_til_ready with %d\n", | ||
1828 | retval); | ||
1829 | #endif | ||
1830 | return retval; | ||
1831 | } | ||
1832 | |||
1833 | #ifdef SERIAL_DEBUG_OPEN | ||
1834 | printk("rs_open %s successful...", tty->name); | ||
1835 | #endif | ||
1836 | return 0; | ||
1837 | } | ||
1838 | |||
1839 | /* | ||
1840 | * /proc fs routines.... | ||
1841 | */ | ||
1842 | |||
1843 | static inline void line_info(struct seq_file *m, struct serial_state *state) | ||
1844 | { | ||
1845 | struct async_struct *info = state->info, scr_info; | ||
1846 | char stat_buf[30], control, status; | ||
1847 | unsigned long flags; | ||
1848 | |||
1849 | seq_printf(m, "%d: uart:amiga_builtin",state->line); | ||
1850 | |||
1851 | /* | ||
1852 | * Figure out the current RS-232 lines | ||
1853 | */ | ||
1854 | if (!info) { | ||
1855 | info = &scr_info; /* This is just for serial_{in,out} */ | ||
1856 | |||
1857 | info->magic = SERIAL_MAGIC; | ||
1858 | info->flags = state->flags; | ||
1859 | info->quot = 0; | ||
1860 | info->tty = NULL; | ||
1861 | } | ||
1862 | local_irq_save(flags); | ||
1863 | status = ciab.pra; | ||
1864 | control = info ? info->MCR : status; | ||
1865 | local_irq_restore(flags); | ||
1866 | |||
1867 | stat_buf[0] = 0; | ||
1868 | stat_buf[1] = 0; | ||
1869 | if(!(control & SER_RTS)) | ||
1870 | strcat(stat_buf, "|RTS"); | ||
1871 | if(!(status & SER_CTS)) | ||
1872 | strcat(stat_buf, "|CTS"); | ||
1873 | if(!(control & SER_DTR)) | ||
1874 | strcat(stat_buf, "|DTR"); | ||
1875 | if(!(status & SER_DSR)) | ||
1876 | strcat(stat_buf, "|DSR"); | ||
1877 | if(!(status & SER_DCD)) | ||
1878 | strcat(stat_buf, "|CD"); | ||
1879 | |||
1880 | if (info->quot) { | ||
1881 | seq_printf(m, " baud:%d", state->baud_base / info->quot); | ||
1882 | } | ||
1883 | |||
1884 | seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); | ||
1885 | |||
1886 | if (state->icount.frame) | ||
1887 | seq_printf(m, " fe:%d", state->icount.frame); | ||
1888 | |||
1889 | if (state->icount.parity) | ||
1890 | seq_printf(m, " pe:%d", state->icount.parity); | ||
1891 | |||
1892 | if (state->icount.brk) | ||
1893 | seq_printf(m, " brk:%d", state->icount.brk); | ||
1894 | |||
1895 | if (state->icount.overrun) | ||
1896 | seq_printf(m, " oe:%d", state->icount.overrun); | ||
1897 | |||
1898 | /* | ||
1899 | * Last thing is the RS-232 status lines | ||
1900 | */ | ||
1901 | seq_printf(m, " %s\n", stat_buf+1); | ||
1902 | } | ||
1903 | |||
1904 | static int rs_proc_show(struct seq_file *m, void *v) | ||
1905 | { | ||
1906 | seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); | ||
1907 | line_info(m, &rs_table[0]); | ||
1908 | return 0; | ||
1909 | } | ||
1910 | |||
1911 | static int rs_proc_open(struct inode *inode, struct file *file) | ||
1912 | { | ||
1913 | return single_open(file, rs_proc_show, NULL); | ||
1914 | } | ||
1915 | |||
1916 | static const struct file_operations rs_proc_fops = { | ||
1917 | .owner = THIS_MODULE, | ||
1918 | .open = rs_proc_open, | ||
1919 | .read = seq_read, | ||
1920 | .llseek = seq_lseek, | ||
1921 | .release = single_release, | ||
1922 | }; | ||
1923 | |||
1924 | /* | ||
1925 | * --------------------------------------------------------------------- | ||
1926 | * rs_init() and friends | ||
1927 | * | ||
1928 | * rs_init() is called at boot-time to initialize the serial driver. | ||
1929 | * --------------------------------------------------------------------- | ||
1930 | */ | ||
1931 | |||
1932 | /* | ||
1933 | * This routine prints out the appropriate serial driver version | ||
1934 | * number, and identifies which options were configured into this | ||
1935 | * driver. | ||
1936 | */ | ||
1937 | static void show_serial_version(void) | ||
1938 | { | ||
1939 | printk(KERN_INFO "%s version %s\n", serial_name, serial_version); | ||
1940 | } | ||
1941 | |||
1942 | |||
1943 | static const struct tty_operations serial_ops = { | ||
1944 | .open = rs_open, | ||
1945 | .close = rs_close, | ||
1946 | .write = rs_write, | ||
1947 | .put_char = rs_put_char, | ||
1948 | .flush_chars = rs_flush_chars, | ||
1949 | .write_room = rs_write_room, | ||
1950 | .chars_in_buffer = rs_chars_in_buffer, | ||
1951 | .flush_buffer = rs_flush_buffer, | ||
1952 | .ioctl = rs_ioctl, | ||
1953 | .throttle = rs_throttle, | ||
1954 | .unthrottle = rs_unthrottle, | ||
1955 | .set_termios = rs_set_termios, | ||
1956 | .stop = rs_stop, | ||
1957 | .start = rs_start, | ||
1958 | .hangup = rs_hangup, | ||
1959 | .break_ctl = rs_break, | ||
1960 | .send_xchar = rs_send_xchar, | ||
1961 | .wait_until_sent = rs_wait_until_sent, | ||
1962 | .tiocmget = rs_tiocmget, | ||
1963 | .tiocmset = rs_tiocmset, | ||
1964 | .get_icount = rs_get_icount, | ||
1965 | .proc_fops = &rs_proc_fops, | ||
1966 | }; | ||
1967 | |||
1968 | /* | ||
1969 | * The serial driver boot-time initialization code! | ||
1970 | */ | ||
1971 | static int __init amiga_serial_probe(struct platform_device *pdev) | ||
1972 | { | ||
1973 | unsigned long flags; | ||
1974 | struct serial_state * state; | ||
1975 | int error; | ||
1976 | |||
1977 | serial_driver = alloc_tty_driver(1); | ||
1978 | if (!serial_driver) | ||
1979 | return -ENOMEM; | ||
1980 | |||
1981 | IRQ_ports = NULL; | ||
1982 | |||
1983 | show_serial_version(); | ||
1984 | |||
1985 | /* Initialize the tty_driver structure */ | ||
1986 | |||
1987 | serial_driver->owner = THIS_MODULE; | ||
1988 | serial_driver->driver_name = "amiserial"; | ||
1989 | serial_driver->name = "ttyS"; | ||
1990 | serial_driver->major = TTY_MAJOR; | ||
1991 | serial_driver->minor_start = 64; | ||
1992 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | ||
1993 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | ||
1994 | serial_driver->init_termios = tty_std_termios; | ||
1995 | serial_driver->init_termios.c_cflag = | ||
1996 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | ||
1997 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | ||
1998 | tty_set_operations(serial_driver, &serial_ops); | ||
1999 | |||
2000 | error = tty_register_driver(serial_driver); | ||
2001 | if (error) | ||
2002 | goto fail_put_tty_driver; | ||
2003 | |||
2004 | state = rs_table; | ||
2005 | state->magic = SSTATE_MAGIC; | ||
2006 | state->port = (int)&custom.serdatr; /* Just to give it a value */ | ||
2007 | state->line = 0; | ||
2008 | state->custom_divisor = 0; | ||
2009 | state->close_delay = 5*HZ/10; | ||
2010 | state->closing_wait = 30*HZ; | ||
2011 | state->icount.cts = state->icount.dsr = | ||
2012 | state->icount.rng = state->icount.dcd = 0; | ||
2013 | state->icount.rx = state->icount.tx = 0; | ||
2014 | state->icount.frame = state->icount.parity = 0; | ||
2015 | state->icount.overrun = state->icount.brk = 0; | ||
2016 | |||
2017 | printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n", | ||
2018 | state->line); | ||
2019 | |||
2020 | /* Hardware set up */ | ||
2021 | |||
2022 | state->baud_base = amiga_colorclock; | ||
2023 | state->xmit_fifo_size = 1; | ||
2024 | |||
2025 | /* set ISRs, and then disable the rx interrupts */ | ||
2026 | error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); | ||
2027 | if (error) | ||
2028 | goto fail_unregister; | ||
2029 | |||
2030 | error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, | ||
2031 | "serial RX", state); | ||
2032 | if (error) | ||
2033 | goto fail_free_irq; | ||
2034 | |||
2035 | local_irq_save(flags); | ||
2036 | |||
2037 | /* turn off Rx and Tx interrupts */ | ||
2038 | custom.intena = IF_RBF | IF_TBE; | ||
2039 | mb(); | ||
2040 | |||
2041 | /* clear any pending interrupt */ | ||
2042 | custom.intreq = IF_RBF | IF_TBE; | ||
2043 | mb(); | ||
2044 | |||
2045 | local_irq_restore(flags); | ||
2046 | |||
2047 | /* | ||
2048 | * set the appropriate directions for the modem control flags, | ||
2049 | * and clear RTS and DTR | ||
2050 | */ | ||
2051 | ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ | ||
2052 | ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ | ||
2053 | |||
2054 | platform_set_drvdata(pdev, state); | ||
2055 | |||
2056 | return 0; | ||
2057 | |||
2058 | fail_free_irq: | ||
2059 | free_irq(IRQ_AMIGA_TBE, state); | ||
2060 | fail_unregister: | ||
2061 | tty_unregister_driver(serial_driver); | ||
2062 | fail_put_tty_driver: | ||
2063 | put_tty_driver(serial_driver); | ||
2064 | return error; | ||
2065 | } | ||
2066 | |||
2067 | static int __exit amiga_serial_remove(struct platform_device *pdev) | ||
2068 | { | ||
2069 | int error; | ||
2070 | struct serial_state *state = platform_get_drvdata(pdev); | ||
2071 | struct async_struct *info = state->info; | ||
2072 | |||
2073 | /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ | ||
2074 | tasklet_kill(&info->tlet); | ||
2075 | if ((error = tty_unregister_driver(serial_driver))) | ||
2076 | printk("SERIAL: failed to unregister serial driver (%d)\n", | ||
2077 | error); | ||
2078 | put_tty_driver(serial_driver); | ||
2079 | |||
2080 | rs_table[0].info = NULL; | ||
2081 | kfree(info); | ||
2082 | |||
2083 | free_irq(IRQ_AMIGA_TBE, rs_table); | ||
2084 | free_irq(IRQ_AMIGA_RBF, rs_table); | ||
2085 | |||
2086 | platform_set_drvdata(pdev, NULL); | ||
2087 | |||
2088 | return error; | ||
2089 | } | ||
2090 | |||
2091 | static struct platform_driver amiga_serial_driver = { | ||
2092 | .remove = __exit_p(amiga_serial_remove), | ||
2093 | .driver = { | ||
2094 | .name = "amiga-serial", | ||
2095 | .owner = THIS_MODULE, | ||
2096 | }, | ||
2097 | }; | ||
2098 | |||
2099 | static int __init amiga_serial_init(void) | ||
2100 | { | ||
2101 | return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe); | ||
2102 | } | ||
2103 | |||
2104 | module_init(amiga_serial_init); | ||
2105 | |||
2106 | static void __exit amiga_serial_exit(void) | ||
2107 | { | ||
2108 | platform_driver_unregister(&amiga_serial_driver); | ||
2109 | } | ||
2110 | |||
2111 | module_exit(amiga_serial_exit); | ||
2112 | |||
2113 | |||
2114 | #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) | ||
2115 | |||
2116 | /* | ||
2117 | * ------------------------------------------------------------ | ||
2118 | * Serial console driver | ||
2119 | * ------------------------------------------------------------ | ||
2120 | */ | ||
2121 | |||
2122 | static void amiga_serial_putc(char c) | ||
2123 | { | ||
2124 | custom.serdat = (unsigned char)c | 0x100; | ||
2125 | while (!(custom.serdatr & 0x2000)) | ||
2126 | barrier(); | ||
2127 | } | ||
2128 | |||
2129 | /* | ||
2130 | * Print a string to the serial port trying not to disturb | ||
2131 | * any possible real use of the port... | ||
2132 | * | ||
2133 | * The console must be locked when we get here. | ||
2134 | */ | ||
2135 | static void serial_console_write(struct console *co, const char *s, | ||
2136 | unsigned count) | ||
2137 | { | ||
2138 | unsigned short intena = custom.intenar; | ||
2139 | |||
2140 | custom.intena = IF_TBE; | ||
2141 | |||
2142 | while (count--) { | ||
2143 | if (*s == '\n') | ||
2144 | amiga_serial_putc('\r'); | ||
2145 | amiga_serial_putc(*s++); | ||
2146 | } | ||
2147 | |||
2148 | custom.intena = IF_SETCLR | (intena & IF_TBE); | ||
2149 | } | ||
2150 | |||
2151 | static struct tty_driver *serial_console_device(struct console *c, int *index) | ||
2152 | { | ||
2153 | *index = 0; | ||
2154 | return serial_driver; | ||
2155 | } | ||
2156 | |||
2157 | static struct console sercons = { | ||
2158 | .name = "ttyS", | ||
2159 | .write = serial_console_write, | ||
2160 | .device = serial_console_device, | ||
2161 | .flags = CON_PRINTBUFFER, | ||
2162 | .index = -1, | ||
2163 | }; | ||
2164 | |||
2165 | /* | ||
2166 | * Register console. | ||
2167 | */ | ||
2168 | static int __init amiserial_console_init(void) | ||
2169 | { | ||
2170 | register_console(&sercons); | ||
2171 | return 0; | ||
2172 | } | ||
2173 | console_initcall(amiserial_console_init); | ||
2174 | |||
2175 | #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ | ||
2176 | |||
2177 | MODULE_LICENSE("GPL"); | ||
2178 | MODULE_ALIAS("platform:amiga-serial"); | ||