Commit | Line | Data |
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1da177e4 LT |
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/config.h> | |
35 | #include <linux/delay.h> | |
36 | ||
37 | #undef SERIAL_PARANOIA_CHECK | |
38 | #define SERIAL_DO_RESTART | |
39 | ||
40 | /* Set of debugging defines */ | |
41 | ||
42 | #undef SERIAL_DEBUG_INTR | |
43 | #undef SERIAL_DEBUG_OPEN | |
44 | #undef SERIAL_DEBUG_FLOW | |
45 | #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
46 | ||
47 | /* Sanity checks */ | |
48 | ||
49 | #define SERIAL_INLINE | |
50 | ||
51 | #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) | |
52 | #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ | |
53 | tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s) | |
54 | #else | |
55 | #define DBG_CNT(s) | |
56 | #endif | |
57 | ||
58 | /* | |
59 | * End of serial driver configuration section. | |
60 | */ | |
61 | ||
62 | #include <linux/module.h> | |
63 | ||
64 | #include <linux/types.h> | |
65 | #include <linux/serial.h> | |
66 | #include <linux/serialP.h> | |
67 | #include <linux/serial_reg.h> | |
68 | static char *serial_version = "4.30"; | |
69 | ||
70 | #include <linux/errno.h> | |
71 | #include <linux/signal.h> | |
72 | #include <linux/sched.h> | |
73 | #include <linux/kernel.h> | |
74 | #include <linux/timer.h> | |
75 | #include <linux/interrupt.h> | |
76 | #include <linux/tty.h> | |
77 | #include <linux/tty_flip.h> | |
78 | #include <linux/console.h> | |
79 | #include <linux/major.h> | |
80 | #include <linux/string.h> | |
81 | #include <linux/fcntl.h> | |
82 | #include <linux/ptrace.h> | |
83 | #include <linux/ioport.h> | |
84 | #include <linux/mm.h> | |
85 | #include <linux/slab.h> | |
86 | #include <linux/init.h> | |
87 | #include <linux/bitops.h> | |
88 | ||
89 | #include <asm/setup.h> | |
90 | ||
91 | #include <asm/system.h> | |
92 | ||
93 | #include <asm/irq.h> | |
94 | ||
95 | #include <asm/amigahw.h> | |
96 | #include <asm/amigaints.h> | |
97 | ||
98 | #ifdef SERIAL_INLINE | |
99 | #define _INLINE_ inline | |
100 | #endif | |
101 | ||
102 | static char *serial_name = "Amiga-builtin serial driver"; | |
103 | ||
104 | static struct tty_driver *serial_driver; | |
105 | ||
106 | /* number of characters left in xmit buffer before we ask for more */ | |
107 | #define WAKEUP_CHARS 256 | |
108 | ||
109 | static struct async_struct *IRQ_ports; | |
110 | ||
111 | static unsigned char current_ctl_bits; | |
112 | ||
113 | static void change_speed(struct async_struct *info, struct termios *old); | |
114 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); | |
115 | ||
116 | ||
117 | static struct serial_state rs_table[1]; | |
118 | ||
fe971071 | 119 | #define NR_PORTS ARRAY_SIZE(rs_table) |
1da177e4 LT |
120 | |
121 | /* | |
122 | * tmp_buf is used as a temporary buffer by serial_write. We need to | |
123 | * lock it in case the copy_from_user blocks while swapping in a page, | |
124 | * and some other program tries to do a serial write at the same time. | |
125 | * Since the lock will only come under contention when the system is | |
126 | * swapping and available memory is low, it makes sense to share one | |
127 | * buffer across all the serial ports, since it significantly saves | |
128 | * memory if large numbers of serial ports are open. | |
129 | */ | |
130 | static unsigned char *tmp_buf; | |
131 | static DECLARE_MUTEX(tmp_buf_sem); | |
132 | ||
133 | #include <asm/uaccess.h> | |
134 | ||
135 | #define serial_isroot() (capable(CAP_SYS_ADMIN)) | |
136 | ||
137 | ||
138 | static inline int serial_paranoia_check(struct async_struct *info, | |
139 | char *name, const char *routine) | |
140 | { | |
141 | #ifdef SERIAL_PARANOIA_CHECK | |
142 | static const char *badmagic = | |
143 | "Warning: bad magic number for serial struct (%s) in %s\n"; | |
144 | static const char *badinfo = | |
145 | "Warning: null async_struct for (%s) in %s\n"; | |
146 | ||
147 | if (!info) { | |
148 | printk(badinfo, name, routine); | |
149 | return 1; | |
150 | } | |
151 | if (info->magic != SERIAL_MAGIC) { | |
152 | printk(badmagic, name, routine); | |
153 | return 1; | |
154 | } | |
155 | #endif | |
156 | return 0; | |
157 | } | |
158 | ||
159 | /* some serial hardware definitions */ | |
160 | #define SDR_OVRUN (1<<15) | |
161 | #define SDR_RBF (1<<14) | |
162 | #define SDR_TBE (1<<13) | |
163 | #define SDR_TSRE (1<<12) | |
164 | ||
165 | #define SERPER_PARENB (1<<15) | |
166 | ||
167 | #define AC_SETCLR (1<<15) | |
168 | #define AC_UARTBRK (1<<11) | |
169 | ||
170 | #define SER_DTR (1<<7) | |
171 | #define SER_RTS (1<<6) | |
172 | #define SER_DCD (1<<5) | |
173 | #define SER_CTS (1<<4) | |
174 | #define SER_DSR (1<<3) | |
175 | ||
176 | static __inline__ void rtsdtr_ctrl(int bits) | |
177 | { | |
178 | ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); | |
179 | } | |
180 | ||
181 | /* | |
182 | * ------------------------------------------------------------ | |
183 | * rs_stop() and rs_start() | |
184 | * | |
185 | * This routines are called before setting or resetting tty->stopped. | |
186 | * They enable or disable transmitter interrupts, as necessary. | |
187 | * ------------------------------------------------------------ | |
188 | */ | |
189 | static void rs_stop(struct tty_struct *tty) | |
190 | { | |
191 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
192 | unsigned long flags; | |
193 | ||
194 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
195 | return; | |
196 | ||
197 | local_irq_save(flags); | |
198 | if (info->IER & UART_IER_THRI) { | |
199 | info->IER &= ~UART_IER_THRI; | |
200 | /* disable Tx interrupt and remove any pending interrupts */ | |
201 | custom.intena = IF_TBE; | |
202 | mb(); | |
203 | custom.intreq = IF_TBE; | |
204 | mb(); | |
205 | } | |
206 | local_irq_restore(flags); | |
207 | } | |
208 | ||
209 | static void rs_start(struct tty_struct *tty) | |
210 | { | |
211 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
212 | unsigned long flags; | |
213 | ||
214 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
215 | return; | |
216 | ||
217 | local_irq_save(flags); | |
218 | if (info->xmit.head != info->xmit.tail | |
219 | && info->xmit.buf | |
220 | && !(info->IER & UART_IER_THRI)) { | |
221 | info->IER |= UART_IER_THRI; | |
222 | custom.intena = IF_SETCLR | IF_TBE; | |
223 | mb(); | |
224 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
225 | custom.intreq = IF_SETCLR | IF_TBE; | |
226 | mb(); | |
227 | } | |
228 | local_irq_restore(flags); | |
229 | } | |
230 | ||
231 | /* | |
232 | * ---------------------------------------------------------------------- | |
233 | * | |
234 | * Here starts the interrupt handling routines. All of the following | |
235 | * subroutines are declared as inline and are folded into | |
236 | * rs_interrupt(). They were separated out for readability's sake. | |
237 | * | |
238 | * Note: rs_interrupt() is a "fast" interrupt, which means that it | |
239 | * runs with interrupts turned off. People who may want to modify | |
240 | * rs_interrupt() should try to keep the interrupt handler as fast as | |
241 | * possible. After you are done making modifications, it is not a bad | |
242 | * idea to do: | |
243 | * | |
244 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c | |
245 | * | |
246 | * and look at the resulting assemble code in serial.s. | |
247 | * | |
248 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
249 | * ----------------------------------------------------------------------- | |
250 | */ | |
251 | ||
252 | /* | |
253 | * This routine is used by the interrupt handler to schedule | |
254 | * processing in the software interrupt portion of the driver. | |
255 | */ | |
256 | static _INLINE_ void rs_sched_event(struct async_struct *info, | |
257 | int event) | |
258 | { | |
259 | info->event |= 1 << event; | |
260 | tasklet_schedule(&info->tlet); | |
261 | } | |
262 | ||
263 | static _INLINE_ void receive_chars(struct async_struct *info) | |
264 | { | |
265 | int status; | |
266 | int serdatr; | |
267 | struct tty_struct *tty = info->tty; | |
268 | unsigned char ch; | |
269 | struct async_icount *icount; | |
270 | ||
271 | icount = &info->state->icount; | |
272 | ||
273 | status = UART_LSR_DR; /* We obviously have a character! */ | |
274 | serdatr = custom.serdatr; | |
275 | mb(); | |
276 | custom.intreq = IF_RBF; | |
277 | mb(); | |
278 | ||
279 | if((serdatr & 0x1ff) == 0) | |
280 | status |= UART_LSR_BI; | |
281 | if(serdatr & SDR_OVRUN) | |
282 | status |= UART_LSR_OE; | |
283 | ||
284 | ch = serdatr & 0xff; | |
285 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) | |
286 | goto ignore_char; | |
287 | *tty->flip.char_buf_ptr = ch; | |
288 | icount->rx++; | |
289 | ||
290 | #ifdef SERIAL_DEBUG_INTR | |
291 | printk("DR%02x:%02x...", ch, status); | |
292 | #endif | |
293 | *tty->flip.flag_buf_ptr = 0; | |
294 | ||
295 | /* | |
296 | * We don't handle parity or frame errors - but I have left | |
297 | * the code in, since I'm not sure that the errors can't be | |
298 | * detected. | |
299 | */ | |
300 | ||
301 | if (status & (UART_LSR_BI | UART_LSR_PE | | |
302 | UART_LSR_FE | UART_LSR_OE)) { | |
303 | /* | |
304 | * For statistics only | |
305 | */ | |
306 | if (status & UART_LSR_BI) { | |
307 | status &= ~(UART_LSR_FE | UART_LSR_PE); | |
308 | icount->brk++; | |
309 | } else if (status & UART_LSR_PE) | |
310 | icount->parity++; | |
311 | else if (status & UART_LSR_FE) | |
312 | icount->frame++; | |
313 | if (status & UART_LSR_OE) | |
314 | icount->overrun++; | |
315 | ||
316 | /* | |
317 | * Now check to see if character should be | |
318 | * ignored, and mask off conditions which | |
319 | * should be ignored. | |
320 | */ | |
321 | if (status & info->ignore_status_mask) | |
322 | goto ignore_char; | |
323 | ||
324 | status &= info->read_status_mask; | |
325 | ||
326 | if (status & (UART_LSR_BI)) { | |
327 | #ifdef SERIAL_DEBUG_INTR | |
328 | printk("handling break...."); | |
329 | #endif | |
330 | *tty->flip.flag_buf_ptr = TTY_BREAK; | |
331 | if (info->flags & ASYNC_SAK) | |
332 | do_SAK(tty); | |
333 | } else if (status & UART_LSR_PE) | |
334 | *tty->flip.flag_buf_ptr = TTY_PARITY; | |
335 | else if (status & UART_LSR_FE) | |
336 | *tty->flip.flag_buf_ptr = TTY_FRAME; | |
337 | if (status & UART_LSR_OE) { | |
338 | /* | |
339 | * Overrun is special, since it's | |
340 | * reported immediately, and doesn't | |
341 | * affect the current character | |
342 | */ | |
343 | if (tty->flip.count < TTY_FLIPBUF_SIZE) { | |
344 | tty->flip.count++; | |
345 | tty->flip.flag_buf_ptr++; | |
346 | tty->flip.char_buf_ptr++; | |
347 | *tty->flip.flag_buf_ptr = TTY_OVERRUN; | |
348 | } | |
349 | } | |
350 | } | |
351 | tty->flip.flag_buf_ptr++; | |
352 | tty->flip.char_buf_ptr++; | |
353 | tty->flip.count++; | |
354 | ignore_char: | |
355 | ||
356 | tty_flip_buffer_push(tty); | |
357 | } | |
358 | ||
359 | static _INLINE_ void transmit_chars(struct async_struct *info) | |
360 | { | |
361 | custom.intreq = IF_TBE; | |
362 | mb(); | |
363 | if (info->x_char) { | |
364 | custom.serdat = info->x_char | 0x100; | |
365 | mb(); | |
366 | info->state->icount.tx++; | |
367 | info->x_char = 0; | |
368 | return; | |
369 | } | |
370 | if (info->xmit.head == info->xmit.tail | |
371 | || info->tty->stopped | |
372 | || info->tty->hw_stopped) { | |
373 | info->IER &= ~UART_IER_THRI; | |
374 | custom.intena = IF_TBE; | |
375 | mb(); | |
376 | return; | |
377 | } | |
378 | ||
379 | custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; | |
380 | mb(); | |
381 | info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); | |
382 | info->state->icount.tx++; | |
383 | ||
384 | if (CIRC_CNT(info->xmit.head, | |
385 | info->xmit.tail, | |
386 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) | |
387 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); | |
388 | ||
389 | #ifdef SERIAL_DEBUG_INTR | |
390 | printk("THRE..."); | |
391 | #endif | |
392 | if (info->xmit.head == info->xmit.tail) { | |
393 | custom.intena = IF_TBE; | |
394 | mb(); | |
395 | info->IER &= ~UART_IER_THRI; | |
396 | } | |
397 | } | |
398 | ||
399 | static _INLINE_ void check_modem_status(struct async_struct *info) | |
400 | { | |
401 | unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); | |
402 | unsigned char dstatus; | |
403 | struct async_icount *icount; | |
404 | ||
405 | /* Determine bits that have changed */ | |
406 | dstatus = status ^ current_ctl_bits; | |
407 | current_ctl_bits = status; | |
408 | ||
409 | if (dstatus) { | |
410 | icount = &info->state->icount; | |
411 | /* update input line counters */ | |
412 | if (dstatus & SER_DSR) | |
413 | icount->dsr++; | |
414 | if (dstatus & SER_DCD) { | |
415 | icount->dcd++; | |
416 | #ifdef CONFIG_HARD_PPS | |
417 | if ((info->flags & ASYNC_HARDPPS_CD) && | |
418 | !(status & SER_DCD)) | |
419 | hardpps(); | |
420 | #endif | |
421 | } | |
422 | if (dstatus & SER_CTS) | |
423 | icount->cts++; | |
424 | wake_up_interruptible(&info->delta_msr_wait); | |
425 | } | |
426 | ||
427 | if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) { | |
428 | #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) | |
429 | printk("ttyS%d CD now %s...", info->line, | |
430 | (!(status & SER_DCD)) ? "on" : "off"); | |
431 | #endif | |
432 | if (!(status & SER_DCD)) | |
433 | wake_up_interruptible(&info->open_wait); | |
434 | else { | |
435 | #ifdef SERIAL_DEBUG_OPEN | |
436 | printk("doing serial hangup..."); | |
437 | #endif | |
438 | if (info->tty) | |
439 | tty_hangup(info->tty); | |
440 | } | |
441 | } | |
442 | if (info->flags & ASYNC_CTS_FLOW) { | |
443 | if (info->tty->hw_stopped) { | |
444 | if (!(status & SER_CTS)) { | |
445 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) | |
446 | printk("CTS tx start..."); | |
447 | #endif | |
448 | info->tty->hw_stopped = 0; | |
449 | info->IER |= UART_IER_THRI; | |
450 | custom.intena = IF_SETCLR | IF_TBE; | |
451 | mb(); | |
452 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
453 | custom.intreq = IF_SETCLR | IF_TBE; | |
454 | mb(); | |
455 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); | |
456 | return; | |
457 | } | |
458 | } else { | |
459 | if ((status & SER_CTS)) { | |
460 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) | |
461 | printk("CTS tx stop..."); | |
462 | #endif | |
463 | info->tty->hw_stopped = 1; | |
464 | info->IER &= ~UART_IER_THRI; | |
465 | /* disable Tx interrupt and remove any pending interrupts */ | |
466 | custom.intena = IF_TBE; | |
467 | mb(); | |
468 | custom.intreq = IF_TBE; | |
469 | mb(); | |
470 | } | |
471 | } | |
472 | } | |
473 | } | |
474 | ||
475 | static irqreturn_t ser_vbl_int( int irq, void *data, struct pt_regs *regs) | |
476 | { | |
477 | /* vbl is just a periodic interrupt we tie into to update modem status */ | |
478 | struct async_struct * info = IRQ_ports; | |
479 | /* | |
480 | * TBD - is it better to unregister from this interrupt or to | |
481 | * ignore it if MSI is clear ? | |
482 | */ | |
483 | if(info->IER & UART_IER_MSI) | |
484 | check_modem_status(info); | |
485 | return IRQ_HANDLED; | |
486 | } | |
487 | ||
488 | static irqreturn_t ser_rx_int(int irq, void *dev_id, struct pt_regs * regs) | |
489 | { | |
490 | struct async_struct * info; | |
491 | ||
492 | #ifdef SERIAL_DEBUG_INTR | |
493 | printk("ser_rx_int..."); | |
494 | #endif | |
495 | ||
496 | info = IRQ_ports; | |
497 | if (!info || !info->tty) | |
498 | return IRQ_NONE; | |
499 | ||
500 | receive_chars(info); | |
501 | info->last_active = jiffies; | |
502 | #ifdef SERIAL_DEBUG_INTR | |
503 | printk("end.\n"); | |
504 | #endif | |
505 | return IRQ_HANDLED; | |
506 | } | |
507 | ||
508 | static irqreturn_t ser_tx_int(int irq, void *dev_id, struct pt_regs * regs) | |
509 | { | |
510 | struct async_struct * info; | |
511 | ||
512 | if (custom.serdatr & SDR_TBE) { | |
513 | #ifdef SERIAL_DEBUG_INTR | |
514 | printk("ser_tx_int..."); | |
515 | #endif | |
516 | ||
517 | info = IRQ_ports; | |
518 | if (!info || !info->tty) | |
519 | return IRQ_NONE; | |
520 | ||
521 | transmit_chars(info); | |
522 | info->last_active = jiffies; | |
523 | #ifdef SERIAL_DEBUG_INTR | |
524 | printk("end.\n"); | |
525 | #endif | |
526 | } | |
527 | return IRQ_HANDLED; | |
528 | } | |
529 | ||
530 | /* | |
531 | * ------------------------------------------------------------------- | |
532 | * Here ends the serial interrupt routines. | |
533 | * ------------------------------------------------------------------- | |
534 | */ | |
535 | ||
536 | /* | |
537 | * This routine is used to handle the "bottom half" processing for the | |
538 | * serial driver, known also the "software interrupt" processing. | |
539 | * This processing is done at the kernel interrupt level, after the | |
540 | * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This | |
541 | * is where time-consuming activities which can not be done in the | |
542 | * interrupt driver proper are done; the interrupt driver schedules | |
543 | * them using rs_sched_event(), and they get done here. | |
544 | */ | |
545 | ||
546 | static void do_softint(unsigned long private_) | |
547 | { | |
548 | struct async_struct *info = (struct async_struct *) private_; | |
549 | struct tty_struct *tty; | |
550 | ||
551 | tty = info->tty; | |
552 | if (!tty) | |
553 | return; | |
554 | ||
555 | if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
556 | tty_wakeup(tty); | |
557 | wake_up_interruptible(&tty->write_wait); | |
558 | } | |
559 | } | |
560 | ||
561 | /* | |
562 | * --------------------------------------------------------------- | |
563 | * Low level utility subroutines for the serial driver: routines to | |
564 | * figure out the appropriate timeout for an interrupt chain, routines | |
565 | * to initialize and startup a serial port, and routines to shutdown a | |
566 | * serial port. Useful stuff like that. | |
567 | * --------------------------------------------------------------- | |
568 | */ | |
569 | ||
570 | static int startup(struct async_struct * info) | |
571 | { | |
572 | unsigned long flags; | |
573 | int retval=0; | |
574 | unsigned long page; | |
575 | ||
576 | page = get_zeroed_page(GFP_KERNEL); | |
577 | if (!page) | |
578 | return -ENOMEM; | |
579 | ||
580 | local_irq_save(flags); | |
581 | ||
582 | if (info->flags & ASYNC_INITIALIZED) { | |
583 | free_page(page); | |
584 | goto errout; | |
585 | } | |
586 | ||
587 | if (info->xmit.buf) | |
588 | free_page(page); | |
589 | else | |
590 | info->xmit.buf = (unsigned char *) page; | |
591 | ||
592 | #ifdef SERIAL_DEBUG_OPEN | |
593 | printk("starting up ttys%d ...", info->line); | |
594 | #endif | |
595 | ||
596 | /* Clear anything in the input buffer */ | |
597 | ||
598 | custom.intreq = IF_RBF; | |
599 | mb(); | |
600 | ||
601 | retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); | |
602 | if (retval) { | |
603 | if (serial_isroot()) { | |
604 | if (info->tty) | |
605 | set_bit(TTY_IO_ERROR, | |
606 | &info->tty->flags); | |
607 | retval = 0; | |
608 | } | |
609 | goto errout; | |
610 | } | |
611 | ||
612 | /* enable both Rx and Tx interrupts */ | |
613 | custom.intena = IF_SETCLR | IF_RBF | IF_TBE; | |
614 | mb(); | |
615 | info->IER = UART_IER_MSI; | |
616 | ||
617 | /* remember current state of the DCD and CTS bits */ | |
618 | current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); | |
619 | ||
620 | IRQ_ports = info; | |
621 | ||
622 | info->MCR = 0; | |
623 | if (info->tty->termios->c_cflag & CBAUD) | |
624 | info->MCR = SER_DTR | SER_RTS; | |
625 | rtsdtr_ctrl(info->MCR); | |
626 | ||
627 | if (info->tty) | |
628 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
629 | info->xmit.head = info->xmit.tail = 0; | |
630 | ||
631 | /* | |
632 | * Set up the tty->alt_speed kludge | |
633 | */ | |
634 | if (info->tty) { | |
635 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | |
636 | info->tty->alt_speed = 57600; | |
637 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | |
638 | info->tty->alt_speed = 115200; | |
639 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | |
640 | info->tty->alt_speed = 230400; | |
641 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | |
642 | info->tty->alt_speed = 460800; | |
643 | } | |
644 | ||
645 | /* | |
646 | * and set the speed of the serial port | |
647 | */ | |
648 | change_speed(info, NULL); | |
649 | ||
650 | info->flags |= ASYNC_INITIALIZED; | |
651 | local_irq_restore(flags); | |
652 | return 0; | |
653 | ||
654 | errout: | |
655 | local_irq_restore(flags); | |
656 | return retval; | |
657 | } | |
658 | ||
659 | /* | |
660 | * This routine will shutdown a serial port; interrupts are disabled, and | |
661 | * DTR is dropped if the hangup on close termio flag is on. | |
662 | */ | |
663 | static void shutdown(struct async_struct * info) | |
664 | { | |
665 | unsigned long flags; | |
666 | struct serial_state *state; | |
667 | ||
668 | if (!(info->flags & ASYNC_INITIALIZED)) | |
669 | return; | |
670 | ||
671 | state = info->state; | |
672 | ||
673 | #ifdef SERIAL_DEBUG_OPEN | |
674 | printk("Shutting down serial port %d ....\n", info->line); | |
675 | #endif | |
676 | ||
677 | local_irq_save(flags); /* Disable interrupts */ | |
678 | ||
679 | /* | |
680 | * clear delta_msr_wait queue to avoid mem leaks: we may free the irq | |
681 | * here so the queue might never be waken up | |
682 | */ | |
683 | wake_up_interruptible(&info->delta_msr_wait); | |
684 | ||
685 | IRQ_ports = NULL; | |
686 | ||
687 | /* | |
688 | * Free the IRQ, if necessary | |
689 | */ | |
690 | free_irq(IRQ_AMIGA_VERTB, info); | |
691 | ||
692 | if (info->xmit.buf) { | |
693 | free_page((unsigned long) info->xmit.buf); | |
694 | info->xmit.buf = NULL; | |
695 | } | |
696 | ||
697 | info->IER = 0; | |
698 | custom.intena = IF_RBF | IF_TBE; | |
699 | mb(); | |
700 | ||
701 | /* disable break condition */ | |
702 | custom.adkcon = AC_UARTBRK; | |
703 | mb(); | |
704 | ||
705 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) | |
706 | info->MCR &= ~(SER_DTR|SER_RTS); | |
707 | rtsdtr_ctrl(info->MCR); | |
708 | ||
709 | if (info->tty) | |
710 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
711 | ||
712 | info->flags &= ~ASYNC_INITIALIZED; | |
713 | local_irq_restore(flags); | |
714 | } | |
715 | ||
716 | ||
717 | /* | |
718 | * This routine is called to set the UART divisor registers to match | |
719 | * the specified baud rate for a serial port. | |
720 | */ | |
721 | static void change_speed(struct async_struct *info, | |
722 | struct termios *old_termios) | |
723 | { | |
724 | int quot = 0, baud_base, baud; | |
725 | unsigned cflag, cval = 0; | |
726 | int bits; | |
727 | unsigned long flags; | |
728 | ||
729 | if (!info->tty || !info->tty->termios) | |
730 | return; | |
731 | cflag = info->tty->termios->c_cflag; | |
732 | ||
733 | /* Byte size is always 8 bits plus parity bit if requested */ | |
734 | ||
735 | cval = 3; bits = 10; | |
736 | if (cflag & CSTOPB) { | |
737 | cval |= 0x04; | |
738 | bits++; | |
739 | } | |
740 | if (cflag & PARENB) { | |
741 | cval |= UART_LCR_PARITY; | |
742 | bits++; | |
743 | } | |
744 | if (!(cflag & PARODD)) | |
745 | cval |= UART_LCR_EPAR; | |
746 | #ifdef CMSPAR | |
747 | if (cflag & CMSPAR) | |
748 | cval |= UART_LCR_SPAR; | |
749 | #endif | |
750 | ||
751 | /* Determine divisor based on baud rate */ | |
752 | baud = tty_get_baud_rate(info->tty); | |
753 | if (!baud) | |
754 | baud = 9600; /* B0 transition handled in rs_set_termios */ | |
755 | baud_base = info->state->baud_base; | |
756 | if (baud == 38400 && | |
757 | ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) | |
758 | quot = info->state->custom_divisor; | |
759 | else { | |
760 | if (baud == 134) | |
761 | /* Special case since 134 is really 134.5 */ | |
762 | quot = (2*baud_base / 269); | |
763 | else if (baud) | |
764 | quot = baud_base / baud; | |
765 | } | |
766 | /* If the quotient is zero refuse the change */ | |
767 | if (!quot && old_termios) { | |
768 | info->tty->termios->c_cflag &= ~CBAUD; | |
769 | info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD); | |
770 | baud = tty_get_baud_rate(info->tty); | |
771 | if (!baud) | |
772 | baud = 9600; | |
773 | if (baud == 38400 && | |
774 | ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) | |
775 | quot = info->state->custom_divisor; | |
776 | else { | |
777 | if (baud == 134) | |
778 | /* Special case since 134 is really 134.5 */ | |
779 | quot = (2*baud_base / 269); | |
780 | else if (baud) | |
781 | quot = baud_base / baud; | |
782 | } | |
783 | } | |
784 | /* As a last resort, if the quotient is zero, default to 9600 bps */ | |
785 | if (!quot) | |
786 | quot = baud_base / 9600; | |
787 | info->quot = quot; | |
788 | info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); | |
789 | info->timeout += HZ/50; /* Add .02 seconds of slop */ | |
790 | ||
791 | /* CTS flow control flag and modem status interrupts */ | |
792 | info->IER &= ~UART_IER_MSI; | |
793 | if (info->flags & ASYNC_HARDPPS_CD) | |
794 | info->IER |= UART_IER_MSI; | |
795 | if (cflag & CRTSCTS) { | |
796 | info->flags |= ASYNC_CTS_FLOW; | |
797 | info->IER |= UART_IER_MSI; | |
798 | } else | |
799 | info->flags &= ~ASYNC_CTS_FLOW; | |
800 | if (cflag & CLOCAL) | |
801 | info->flags &= ~ASYNC_CHECK_CD; | |
802 | else { | |
803 | info->flags |= ASYNC_CHECK_CD; | |
804 | info->IER |= UART_IER_MSI; | |
805 | } | |
806 | /* TBD: | |
807 | * Does clearing IER_MSI imply that we should disbale the VBL interrupt ? | |
808 | */ | |
809 | ||
810 | /* | |
811 | * Set up parity check flag | |
812 | */ | |
813 | #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) | |
814 | ||
815 | info->read_status_mask = UART_LSR_OE | UART_LSR_DR; | |
816 | if (I_INPCK(info->tty)) | |
817 | info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
818 | if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) | |
819 | info->read_status_mask |= UART_LSR_BI; | |
820 | ||
821 | /* | |
822 | * Characters to ignore | |
823 | */ | |
824 | info->ignore_status_mask = 0; | |
825 | if (I_IGNPAR(info->tty)) | |
826 | info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
827 | if (I_IGNBRK(info->tty)) { | |
828 | info->ignore_status_mask |= UART_LSR_BI; | |
829 | /* | |
830 | * If we're ignore parity and break indicators, ignore | |
831 | * overruns too. (For real raw support). | |
832 | */ | |
833 | if (I_IGNPAR(info->tty)) | |
834 | info->ignore_status_mask |= UART_LSR_OE; | |
835 | } | |
836 | /* | |
837 | * !!! ignore all characters if CREAD is not set | |
838 | */ | |
839 | if ((cflag & CREAD) == 0) | |
840 | info->ignore_status_mask |= UART_LSR_DR; | |
841 | local_irq_save(flags); | |
842 | ||
843 | { | |
844 | short serper; | |
845 | ||
846 | /* Set up the baud rate */ | |
847 | serper = quot - 1; | |
848 | ||
849 | /* Enable or disable parity bit */ | |
850 | ||
851 | if(cval & UART_LCR_PARITY) | |
852 | serper |= (SERPER_PARENB); | |
853 | ||
854 | custom.serper = serper; | |
855 | mb(); | |
856 | } | |
857 | ||
858 | info->LCR = cval; /* Save LCR */ | |
859 | local_irq_restore(flags); | |
860 | } | |
861 | ||
862 | static void rs_put_char(struct tty_struct *tty, unsigned char ch) | |
863 | { | |
d9ad7ef1 | 864 | struct async_struct *info; |
1da177e4 LT |
865 | unsigned long flags; |
866 | ||
d9ad7ef1 TJRMI |
867 | if (!tty) |
868 | return; | |
869 | ||
870 | info = tty->driver_data; | |
871 | ||
1da177e4 LT |
872 | if (serial_paranoia_check(info, tty->name, "rs_put_char")) |
873 | return; | |
874 | ||
d9ad7ef1 | 875 | if (!info->xmit.buf) |
1da177e4 LT |
876 | return; |
877 | ||
878 | local_irq_save(flags); | |
879 | if (CIRC_SPACE(info->xmit.head, | |
880 | info->xmit.tail, | |
881 | SERIAL_XMIT_SIZE) == 0) { | |
882 | local_irq_restore(flags); | |
883 | return; | |
884 | } | |
885 | ||
886 | info->xmit.buf[info->xmit.head++] = ch; | |
887 | info->xmit.head &= SERIAL_XMIT_SIZE-1; | |
888 | local_irq_restore(flags); | |
889 | } | |
890 | ||
891 | static void rs_flush_chars(struct tty_struct *tty) | |
892 | { | |
893 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
894 | unsigned long flags; | |
895 | ||
896 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
897 | return; | |
898 | ||
899 | if (info->xmit.head == info->xmit.tail | |
900 | || tty->stopped | |
901 | || tty->hw_stopped | |
902 | || !info->xmit.buf) | |
903 | return; | |
904 | ||
905 | local_irq_save(flags); | |
906 | info->IER |= UART_IER_THRI; | |
907 | custom.intena = IF_SETCLR | IF_TBE; | |
908 | mb(); | |
909 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
910 | custom.intreq = IF_SETCLR | IF_TBE; | |
911 | mb(); | |
912 | local_irq_restore(flags); | |
913 | } | |
914 | ||
915 | static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) | |
916 | { | |
917 | int c, ret = 0; | |
d9ad7ef1 | 918 | struct async_struct *info; |
1da177e4 LT |
919 | unsigned long flags; |
920 | ||
d9ad7ef1 TJRMI |
921 | if (!tty) |
922 | return 0; | |
923 | ||
924 | info = tty->driver_data; | |
925 | ||
1da177e4 LT |
926 | if (serial_paranoia_check(info, tty->name, "rs_write")) |
927 | return 0; | |
928 | ||
d9ad7ef1 | 929 | if (!info->xmit.buf || !tmp_buf) |
1da177e4 LT |
930 | return 0; |
931 | ||
932 | local_save_flags(flags); | |
933 | local_irq_disable(); | |
934 | while (1) { | |
935 | c = CIRC_SPACE_TO_END(info->xmit.head, | |
936 | info->xmit.tail, | |
937 | SERIAL_XMIT_SIZE); | |
938 | if (count < c) | |
939 | c = count; | |
940 | if (c <= 0) { | |
941 | break; | |
942 | } | |
943 | memcpy(info->xmit.buf + info->xmit.head, buf, c); | |
944 | info->xmit.head = ((info->xmit.head + c) & | |
945 | (SERIAL_XMIT_SIZE-1)); | |
946 | buf += c; | |
947 | count -= c; | |
948 | ret += c; | |
949 | } | |
950 | local_irq_restore(flags); | |
951 | ||
952 | if (info->xmit.head != info->xmit.tail | |
953 | && !tty->stopped | |
954 | && !tty->hw_stopped | |
955 | && !(info->IER & UART_IER_THRI)) { | |
956 | info->IER |= UART_IER_THRI; | |
957 | local_irq_disable(); | |
958 | custom.intena = IF_SETCLR | IF_TBE; | |
959 | mb(); | |
960 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
961 | custom.intreq = IF_SETCLR | IF_TBE; | |
962 | mb(); | |
963 | local_irq_restore(flags); | |
964 | } | |
965 | return ret; | |
966 | } | |
967 | ||
968 | static int rs_write_room(struct tty_struct *tty) | |
969 | { | |
970 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
971 | ||
972 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
973 | return 0; | |
974 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
975 | } | |
976 | ||
977 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
978 | { | |
979 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
980 | ||
981 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
982 | return 0; | |
983 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
984 | } | |
985 | ||
986 | static void rs_flush_buffer(struct tty_struct *tty) | |
987 | { | |
988 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
989 | unsigned long flags; | |
990 | ||
991 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
992 | return; | |
993 | local_irq_save(flags); | |
994 | info->xmit.head = info->xmit.tail = 0; | |
995 | local_irq_restore(flags); | |
996 | wake_up_interruptible(&tty->write_wait); | |
997 | tty_wakeup(tty); | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * This function is used to send a high-priority XON/XOFF character to | |
1002 | * the device | |
1003 | */ | |
1004 | static void rs_send_xchar(struct tty_struct *tty, char ch) | |
1005 | { | |
1006 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
1007 | unsigned long flags; | |
1008 | ||
1009 | if (serial_paranoia_check(info, tty->name, "rs_send_char")) | |
1010 | return; | |
1011 | ||
1012 | info->x_char = ch; | |
1013 | if (ch) { | |
1014 | /* Make sure transmit interrupts are on */ | |
1015 | ||
1016 | /* Check this ! */ | |
1017 | local_irq_save(flags); | |
1018 | if(!(custom.intenar & IF_TBE)) { | |
1019 | custom.intena = IF_SETCLR | IF_TBE; | |
1020 | mb(); | |
1021 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
1022 | custom.intreq = IF_SETCLR | IF_TBE; | |
1023 | mb(); | |
1024 | } | |
1025 | local_irq_restore(flags); | |
1026 | ||
1027 | info->IER |= UART_IER_THRI; | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * ------------------------------------------------------------ | |
1033 | * rs_throttle() | |
1034 | * | |
1035 | * This routine is called by the upper-layer tty layer to signal that | |
1036 | * incoming characters should be throttled. | |
1037 | * ------------------------------------------------------------ | |
1038 | */ | |
1039 | static void rs_throttle(struct tty_struct * tty) | |
1040 | { | |
1041 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
1042 | unsigned long flags; | |
1043 | #ifdef SERIAL_DEBUG_THROTTLE | |
1044 | char buf[64]; | |
1045 | ||
1046 | printk("throttle %s: %d....\n", tty_name(tty, buf), | |
1047 | tty->ldisc.chars_in_buffer(tty)); | |
1048 | #endif | |
1049 | ||
1050 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
1051 | return; | |
1052 | ||
1053 | if (I_IXOFF(tty)) | |
1054 | rs_send_xchar(tty, STOP_CHAR(tty)); | |
1055 | ||
1056 | if (tty->termios->c_cflag & CRTSCTS) | |
1057 | info->MCR &= ~SER_RTS; | |
1058 | ||
1059 | local_irq_save(flags); | |
1060 | rtsdtr_ctrl(info->MCR); | |
1061 | local_irq_restore(flags); | |
1062 | } | |
1063 | ||
1064 | static void rs_unthrottle(struct tty_struct * tty) | |
1065 | { | |
1066 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
1067 | unsigned long flags; | |
1068 | #ifdef SERIAL_DEBUG_THROTTLE | |
1069 | char buf[64]; | |
1070 | ||
1071 | printk("unthrottle %s: %d....\n", tty_name(tty, buf), | |
1072 | tty->ldisc.chars_in_buffer(tty)); | |
1073 | #endif | |
1074 | ||
1075 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
1076 | return; | |
1077 | ||
1078 | if (I_IXOFF(tty)) { | |
1079 | if (info->x_char) | |
1080 | info->x_char = 0; | |
1081 | else | |
1082 | rs_send_xchar(tty, START_CHAR(tty)); | |
1083 | } | |
1084 | if (tty->termios->c_cflag & CRTSCTS) | |
1085 | info->MCR |= SER_RTS; | |
1086 | local_irq_save(flags); | |
1087 | rtsdtr_ctrl(info->MCR); | |
1088 | local_irq_restore(flags); | |
1089 | } | |
1090 | ||
1091 | /* | |
1092 | * ------------------------------------------------------------ | |
1093 | * rs_ioctl() and friends | |
1094 | * ------------------------------------------------------------ | |
1095 | */ | |
1096 | ||
1097 | static int get_serial_info(struct async_struct * info, | |
1098 | struct serial_struct * retinfo) | |
1099 | { | |
1100 | struct serial_struct tmp; | |
1101 | struct serial_state *state = info->state; | |
1102 | ||
1103 | if (!retinfo) | |
1104 | return -EFAULT; | |
1105 | memset(&tmp, 0, sizeof(tmp)); | |
1106 | tmp.type = state->type; | |
1107 | tmp.line = state->line; | |
1108 | tmp.port = state->port; | |
1109 | tmp.irq = state->irq; | |
1110 | tmp.flags = state->flags; | |
1111 | tmp.xmit_fifo_size = state->xmit_fifo_size; | |
1112 | tmp.baud_base = state->baud_base; | |
1113 | tmp.close_delay = state->close_delay; | |
1114 | tmp.closing_wait = state->closing_wait; | |
1115 | tmp.custom_divisor = state->custom_divisor; | |
1116 | if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) | |
1117 | return -EFAULT; | |
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | static int set_serial_info(struct async_struct * info, | |
1122 | struct serial_struct * new_info) | |
1123 | { | |
1124 | struct serial_struct new_serial; | |
1125 | struct serial_state old_state, *state; | |
1126 | unsigned int change_irq,change_port; | |
1127 | int retval = 0; | |
1128 | ||
1129 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) | |
1130 | return -EFAULT; | |
1131 | state = info->state; | |
1132 | old_state = *state; | |
1133 | ||
1134 | change_irq = new_serial.irq != state->irq; | |
1135 | change_port = (new_serial.port != state->port); | |
1136 | if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) | |
1137 | return -EINVAL; | |
1138 | ||
1139 | if (!serial_isroot()) { | |
1140 | if ((new_serial.baud_base != state->baud_base) || | |
1141 | (new_serial.close_delay != state->close_delay) || | |
1142 | (new_serial.xmit_fifo_size != state->xmit_fifo_size) || | |
1143 | ((new_serial.flags & ~ASYNC_USR_MASK) != | |
1144 | (state->flags & ~ASYNC_USR_MASK))) | |
1145 | return -EPERM; | |
1146 | state->flags = ((state->flags & ~ASYNC_USR_MASK) | | |
1147 | (new_serial.flags & ASYNC_USR_MASK)); | |
1148 | info->flags = ((info->flags & ~ASYNC_USR_MASK) | | |
1149 | (new_serial.flags & ASYNC_USR_MASK)); | |
1150 | state->custom_divisor = new_serial.custom_divisor; | |
1151 | goto check_and_exit; | |
1152 | } | |
1153 | ||
1154 | if (new_serial.baud_base < 9600) | |
1155 | return -EINVAL; | |
1156 | ||
1157 | /* | |
1158 | * OK, past this point, all the error checking has been done. | |
1159 | * At this point, we start making changes..... | |
1160 | */ | |
1161 | ||
1162 | state->baud_base = new_serial.baud_base; | |
1163 | state->flags = ((state->flags & ~ASYNC_FLAGS) | | |
1164 | (new_serial.flags & ASYNC_FLAGS)); | |
1165 | info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) | | |
1166 | (info->flags & ASYNC_INTERNAL_FLAGS)); | |
1167 | state->custom_divisor = new_serial.custom_divisor; | |
1168 | state->close_delay = new_serial.close_delay * HZ/100; | |
1169 | state->closing_wait = new_serial.closing_wait * HZ/100; | |
1170 | info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; | |
1171 | ||
1172 | check_and_exit: | |
1173 | if (info->flags & ASYNC_INITIALIZED) { | |
1174 | if (((old_state.flags & ASYNC_SPD_MASK) != | |
1175 | (state->flags & ASYNC_SPD_MASK)) || | |
1176 | (old_state.custom_divisor != state->custom_divisor)) { | |
1177 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | |
1178 | info->tty->alt_speed = 57600; | |
1179 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | |
1180 | info->tty->alt_speed = 115200; | |
1181 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | |
1182 | info->tty->alt_speed = 230400; | |
1183 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | |
1184 | info->tty->alt_speed = 460800; | |
1185 | change_speed(info, NULL); | |
1186 | } | |
1187 | } else | |
1188 | retval = startup(info); | |
1189 | return retval; | |
1190 | } | |
1191 | ||
1192 | ||
1193 | /* | |
1194 | * get_lsr_info - get line status register info | |
1195 | * | |
1196 | * Purpose: Let user call ioctl() to get info when the UART physically | |
1197 | * is emptied. On bus types like RS485, the transmitter must | |
1198 | * release the bus after transmitting. This must be done when | |
1199 | * the transmit shift register is empty, not be done when the | |
1200 | * transmit holding register is empty. This functionality | |
1201 | * allows an RS485 driver to be written in user space. | |
1202 | */ | |
1203 | static int get_lsr_info(struct async_struct * info, unsigned int *value) | |
1204 | { | |
1205 | unsigned char status; | |
1206 | unsigned int result; | |
1207 | unsigned long flags; | |
1208 | ||
1209 | local_irq_save(flags); | |
1210 | status = custom.serdatr; | |
1211 | mb(); | |
1212 | local_irq_restore(flags); | |
1213 | result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); | |
1214 | if (copy_to_user(value, &result, sizeof(int))) | |
1215 | return -EFAULT; | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | ||
1220 | static int rs_tiocmget(struct tty_struct *tty, struct file *file) | |
1221 | { | |
1222 | struct async_struct * info = (struct async_struct *)tty->driver_data; | |
1223 | unsigned char control, status; | |
1224 | unsigned long flags; | |
1225 | ||
1226 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1227 | return -ENODEV; | |
1228 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1229 | return -EIO; | |
1230 | ||
1231 | control = info->MCR; | |
1232 | local_irq_save(flags); | |
1233 | status = ciab.pra; | |
1234 | local_irq_restore(flags); | |
1235 | return ((control & SER_RTS) ? TIOCM_RTS : 0) | |
1236 | | ((control & SER_DTR) ? TIOCM_DTR : 0) | |
1237 | | (!(status & SER_DCD) ? TIOCM_CAR : 0) | |
1238 | | (!(status & SER_DSR) ? TIOCM_DSR : 0) | |
1239 | | (!(status & SER_CTS) ? TIOCM_CTS : 0); | |
1240 | } | |
1241 | ||
1242 | static int rs_tiocmset(struct tty_struct *tty, struct file *file, | |
1243 | unsigned int set, unsigned int clear) | |
1244 | { | |
1245 | struct async_struct * info = (struct async_struct *)tty->driver_data; | |
1246 | unsigned long flags; | |
1247 | ||
1248 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1249 | return -ENODEV; | |
1250 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1251 | return -EIO; | |
1252 | ||
1253 | local_irq_save(flags); | |
1254 | if (set & TIOCM_RTS) | |
1255 | info->MCR |= SER_RTS; | |
1256 | if (set & TIOCM_DTR) | |
1257 | info->MCR |= SER_DTR; | |
1258 | if (clear & TIOCM_RTS) | |
1259 | info->MCR &= ~SER_RTS; | |
1260 | if (clear & TIOCM_DTR) | |
1261 | info->MCR &= ~SER_DTR; | |
1262 | rtsdtr_ctrl(info->MCR); | |
1263 | local_irq_restore(flags); | |
1264 | return 0; | |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * rs_break() --- routine which turns the break handling on or off | |
1269 | */ | |
1270 | static void rs_break(struct tty_struct *tty, int break_state) | |
1271 | { | |
1272 | struct async_struct * info = (struct async_struct *)tty->driver_data; | |
1273 | unsigned long flags; | |
1274 | ||
1275 | if (serial_paranoia_check(info, tty->name, "rs_break")) | |
1276 | return; | |
1277 | ||
1278 | local_irq_save(flags); | |
1279 | if (break_state == -1) | |
1280 | custom.adkcon = AC_SETCLR | AC_UARTBRK; | |
1281 | else | |
1282 | custom.adkcon = AC_UARTBRK; | |
1283 | mb(); | |
1284 | local_irq_restore(flags); | |
1285 | } | |
1286 | ||
1287 | ||
1288 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
1289 | unsigned int cmd, unsigned long arg) | |
1290 | { | |
1291 | struct async_struct * info = (struct async_struct *)tty->driver_data; | |
1292 | struct async_icount cprev, cnow; /* kernel counter temps */ | |
1293 | struct serial_icounter_struct icount; | |
1294 | unsigned long flags; | |
1295 | ||
1296 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1297 | return -ENODEV; | |
1298 | ||
1299 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1300 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && | |
1301 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { | |
1302 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1303 | return -EIO; | |
1304 | } | |
1305 | ||
1306 | switch (cmd) { | |
1307 | case TIOCGSERIAL: | |
1308 | return get_serial_info(info, | |
1309 | (struct serial_struct *) arg); | |
1310 | case TIOCSSERIAL: | |
1311 | return set_serial_info(info, | |
1312 | (struct serial_struct *) arg); | |
1313 | case TIOCSERCONFIG: | |
1314 | return 0; | |
1315 | ||
1316 | case TIOCSERGETLSR: /* Get line status register */ | |
1317 | return get_lsr_info(info, (unsigned int *) arg); | |
1318 | ||
1319 | case TIOCSERGSTRUCT: | |
1320 | if (copy_to_user((struct async_struct *) arg, | |
1321 | info, sizeof(struct async_struct))) | |
1322 | return -EFAULT; | |
1323 | return 0; | |
1324 | ||
1325 | /* | |
1326 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1327 | * - mask passed in arg for lines of interest | |
1328 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1329 | * Caller should use TIOCGICOUNT to see which one it was | |
1330 | */ | |
1331 | case TIOCMIWAIT: | |
1332 | local_irq_save(flags); | |
1333 | /* note the counters on entry */ | |
1334 | cprev = info->state->icount; | |
1335 | local_irq_restore(flags); | |
1336 | while (1) { | |
1337 | interruptible_sleep_on(&info->delta_msr_wait); | |
1338 | /* see if a signal did it */ | |
1339 | if (signal_pending(current)) | |
1340 | return -ERESTARTSYS; | |
1341 | local_irq_save(flags); | |
1342 | cnow = info->state->icount; /* atomic copy */ | |
1343 | local_irq_restore(flags); | |
1344 | if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && | |
1345 | cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) | |
1346 | return -EIO; /* no change => error */ | |
1347 | if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1348 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1349 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1350 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { | |
1351 | return 0; | |
1352 | } | |
1353 | cprev = cnow; | |
1354 | } | |
1355 | /* NOTREACHED */ | |
1356 | ||
1357 | /* | |
1358 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1359 | * Return: write counters to the user passed counter struct | |
1360 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1361 | * RI where only 0->1 is counted. | |
1362 | */ | |
1363 | case TIOCGICOUNT: | |
1364 | local_irq_save(flags); | |
1365 | cnow = info->state->icount; | |
1366 | local_irq_restore(flags); | |
1367 | icount.cts = cnow.cts; | |
1368 | icount.dsr = cnow.dsr; | |
1369 | icount.rng = cnow.rng; | |
1370 | icount.dcd = cnow.dcd; | |
1371 | icount.rx = cnow.rx; | |
1372 | icount.tx = cnow.tx; | |
1373 | icount.frame = cnow.frame; | |
1374 | icount.overrun = cnow.overrun; | |
1375 | icount.parity = cnow.parity; | |
1376 | icount.brk = cnow.brk; | |
1377 | icount.buf_overrun = cnow.buf_overrun; | |
1378 | ||
1379 | if (copy_to_user((void *)arg, &icount, sizeof(icount))) | |
1380 | return -EFAULT; | |
1381 | return 0; | |
1382 | case TIOCSERGWILD: | |
1383 | case TIOCSERSWILD: | |
1384 | /* "setserial -W" is called in Debian boot */ | |
1385 | printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); | |
1386 | return 0; | |
1387 | ||
1388 | default: | |
1389 | return -ENOIOCTLCMD; | |
1390 | } | |
1391 | return 0; | |
1392 | } | |
1393 | ||
1394 | static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) | |
1395 | { | |
1396 | struct async_struct *info = (struct async_struct *)tty->driver_data; | |
1397 | unsigned long flags; | |
1398 | unsigned int cflag = tty->termios->c_cflag; | |
1399 | ||
1400 | if ( (cflag == old_termios->c_cflag) | |
1401 | && ( RELEVANT_IFLAG(tty->termios->c_iflag) | |
1402 | == RELEVANT_IFLAG(old_termios->c_iflag))) | |
1403 | return; | |
1404 | ||
1405 | change_speed(info, old_termios); | |
1406 | ||
1407 | /* Handle transition to B0 status */ | |
1408 | if ((old_termios->c_cflag & CBAUD) && | |
1409 | !(cflag & CBAUD)) { | |
1410 | info->MCR &= ~(SER_DTR|SER_RTS); | |
1411 | local_irq_save(flags); | |
1412 | rtsdtr_ctrl(info->MCR); | |
1413 | local_irq_restore(flags); | |
1414 | } | |
1415 | ||
1416 | /* Handle transition away from B0 status */ | |
1417 | if (!(old_termios->c_cflag & CBAUD) && | |
1418 | (cflag & CBAUD)) { | |
1419 | info->MCR |= SER_DTR; | |
1420 | if (!(tty->termios->c_cflag & CRTSCTS) || | |
1421 | !test_bit(TTY_THROTTLED, &tty->flags)) { | |
1422 | info->MCR |= SER_RTS; | |
1423 | } | |
1424 | local_irq_save(flags); | |
1425 | rtsdtr_ctrl(info->MCR); | |
1426 | local_irq_restore(flags); | |
1427 | } | |
1428 | ||
1429 | /* Handle turning off CRTSCTS */ | |
1430 | if ((old_termios->c_cflag & CRTSCTS) && | |
1431 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1432 | tty->hw_stopped = 0; | |
1433 | rs_start(tty); | |
1434 | } | |
1435 | ||
1436 | #if 0 | |
1437 | /* | |
1438 | * No need to wake up processes in open wait, since they | |
1439 | * sample the CLOCAL flag once, and don't recheck it. | |
1440 | * XXX It's not clear whether the current behavior is correct | |
1441 | * or not. Hence, this may change..... | |
1442 | */ | |
1443 | if (!(old_termios->c_cflag & CLOCAL) && | |
1444 | (tty->termios->c_cflag & CLOCAL)) | |
1445 | wake_up_interruptible(&info->open_wait); | |
1446 | #endif | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * ------------------------------------------------------------ | |
1451 | * rs_close() | |
1452 | * | |
1453 | * This routine is called when the serial port gets closed. First, we | |
1454 | * wait for the last remaining data to be sent. Then, we unlink its | |
1455 | * async structure from the interrupt chain if necessary, and we free | |
1456 | * that IRQ if nothing is left in the chain. | |
1457 | * ------------------------------------------------------------ | |
1458 | */ | |
1459 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1460 | { | |
1461 | struct async_struct * info = (struct async_struct *)tty->driver_data; | |
1462 | struct serial_state *state; | |
1463 | unsigned long flags; | |
1464 | ||
1465 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1466 | return; | |
1467 | ||
1468 | state = info->state; | |
1469 | ||
1470 | local_irq_save(flags); | |
1471 | ||
1472 | if (tty_hung_up_p(filp)) { | |
1473 | DBG_CNT("before DEC-hung"); | |
1474 | local_irq_restore(flags); | |
1475 | return; | |
1476 | } | |
1477 | ||
1478 | #ifdef SERIAL_DEBUG_OPEN | |
1479 | printk("rs_close ttys%d, count = %d\n", info->line, state->count); | |
1480 | #endif | |
1481 | if ((tty->count == 1) && (state->count != 1)) { | |
1482 | /* | |
1483 | * Uh, oh. tty->count is 1, which means that the tty | |
1484 | * structure will be freed. state->count should always | |
1485 | * be one in these conditions. If it's greater than | |
1486 | * one, we've got real problems, since it means the | |
1487 | * serial port won't be shutdown. | |
1488 | */ | |
1489 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1490 | "state->count is %d\n", state->count); | |
1491 | state->count = 1; | |
1492 | } | |
1493 | if (--state->count < 0) { | |
1494 | printk("rs_close: bad serial port count for ttys%d: %d\n", | |
1495 | info->line, state->count); | |
1496 | state->count = 0; | |
1497 | } | |
1498 | if (state->count) { | |
1499 | DBG_CNT("before DEC-2"); | |
1500 | local_irq_restore(flags); | |
1501 | return; | |
1502 | } | |
1503 | info->flags |= ASYNC_CLOSING; | |
1504 | /* | |
1505 | * Now we wait for the transmit buffer to clear; and we notify | |
1506 | * the line discipline to only process XON/XOFF characters. | |
1507 | */ | |
1508 | tty->closing = 1; | |
1509 | if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
1510 | tty_wait_until_sent(tty, info->closing_wait); | |
1511 | /* | |
1512 | * At this point we stop accepting input. To do this, we | |
1513 | * disable the receive line status interrupts, and tell the | |
1514 | * interrupt driver to stop checking the data ready bit in the | |
1515 | * line status register. | |
1516 | */ | |
1517 | info->read_status_mask &= ~UART_LSR_DR; | |
1518 | if (info->flags & ASYNC_INITIALIZED) { | |
1519 | /* disable receive interrupts */ | |
1520 | custom.intena = IF_RBF; | |
1521 | mb(); | |
1522 | /* clear any pending receive interrupt */ | |
1523 | custom.intreq = IF_RBF; | |
1524 | mb(); | |
1525 | ||
1526 | /* | |
1527 | * Before we drop DTR, make sure the UART transmitter | |
1528 | * has completely drained; this is especially | |
1529 | * important if there is a transmit FIFO! | |
1530 | */ | |
1531 | rs_wait_until_sent(tty, info->timeout); | |
1532 | } | |
1533 | shutdown(info); | |
1534 | if (tty->driver->flush_buffer) | |
1535 | tty->driver->flush_buffer(tty); | |
1536 | ||
1537 | tty_ldisc_flush(tty); | |
1538 | tty->closing = 0; | |
1539 | info->event = 0; | |
1540 | info->tty = NULL; | |
1541 | if (info->blocked_open) { | |
1542 | if (info->close_delay) { | |
1543 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1544 | } | |
1545 | wake_up_interruptible(&info->open_wait); | |
1546 | } | |
1547 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | |
1548 | wake_up_interruptible(&info->close_wait); | |
1549 | local_irq_restore(flags); | |
1550 | } | |
1551 | ||
1552 | /* | |
1553 | * rs_wait_until_sent() --- wait until the transmitter is empty | |
1554 | */ | |
1555 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
1556 | { | |
1557 | struct async_struct * info = (struct async_struct *)tty->driver_data; | |
1558 | unsigned long orig_jiffies, char_time; | |
1559 | int lsr; | |
1560 | ||
1561 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) | |
1562 | return; | |
1563 | ||
1564 | if (info->xmit_fifo_size == 0) | |
1565 | return; /* Just in case.... */ | |
1566 | ||
1567 | orig_jiffies = jiffies; | |
1568 | /* | |
1569 | * Set the check interval to be 1/5 of the estimated time to | |
1570 | * send a single character, and make it at least 1. The check | |
1571 | * interval should also be less than the timeout. | |
1572 | * | |
1573 | * Note: we have to use pretty tight timings here to satisfy | |
1574 | * the NIST-PCTS. | |
1575 | */ | |
1576 | char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; | |
1577 | char_time = char_time / 5; | |
1578 | if (char_time == 0) | |
1579 | char_time = 1; | |
1580 | if (timeout) | |
1581 | char_time = min_t(unsigned long, char_time, timeout); | |
1582 | /* | |
1583 | * If the transmitter hasn't cleared in twice the approximate | |
1584 | * amount of time to send the entire FIFO, it probably won't | |
1585 | * ever clear. This assumes the UART isn't doing flow | |
1586 | * control, which is currently the case. Hence, if it ever | |
1587 | * takes longer than info->timeout, this is probably due to a | |
1588 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1589 | * 2*info->timeout. | |
1590 | */ | |
1591 | if (!timeout || timeout > 2*info->timeout) | |
1592 | timeout = 2*info->timeout; | |
1593 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
1594 | printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); | |
1595 | printk("jiff=%lu...", jiffies); | |
1596 | #endif | |
1597 | while(!((lsr = custom.serdatr) & SDR_TSRE)) { | |
1598 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
1599 | printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); | |
1600 | #endif | |
1601 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1602 | if (signal_pending(current)) | |
1603 | break; | |
1604 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
1605 | break; | |
1606 | } | |
1607 | current->state = TASK_RUNNING; | |
1608 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
1609 | printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); | |
1610 | #endif | |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1615 | */ | |
1616 | static void rs_hangup(struct tty_struct *tty) | |
1617 | { | |
1618 | struct async_struct * info = (struct async_struct *)tty->driver_data; | |
1619 | struct serial_state *state = info->state; | |
1620 | ||
1621 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1622 | return; | |
1623 | ||
1624 | state = info->state; | |
1625 | ||
1626 | rs_flush_buffer(tty); | |
1627 | shutdown(info); | |
1628 | info->event = 0; | |
1629 | state->count = 0; | |
1630 | info->flags &= ~ASYNC_NORMAL_ACTIVE; | |
1631 | info->tty = NULL; | |
1632 | wake_up_interruptible(&info->open_wait); | |
1633 | } | |
1634 | ||
1635 | /* | |
1636 | * ------------------------------------------------------------ | |
1637 | * rs_open() and friends | |
1638 | * ------------------------------------------------------------ | |
1639 | */ | |
1640 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1641 | struct async_struct *info) | |
1642 | { | |
1643 | #ifdef DECLARE_WAITQUEUE | |
1644 | DECLARE_WAITQUEUE(wait, current); | |
1645 | #else | |
1646 | struct wait_queue wait = { current, NULL }; | |
1647 | #endif | |
1648 | struct serial_state *state = info->state; | |
1649 | int retval; | |
1650 | int do_clocal = 0, extra_count = 0; | |
1651 | unsigned long flags; | |
1652 | ||
1653 | /* | |
1654 | * If the device is in the middle of being closed, then block | |
1655 | * until it's done, and then try again. | |
1656 | */ | |
1657 | if (tty_hung_up_p(filp) || | |
1658 | (info->flags & ASYNC_CLOSING)) { | |
1659 | if (info->flags & ASYNC_CLOSING) | |
1660 | interruptible_sleep_on(&info->close_wait); | |
1661 | #ifdef SERIAL_DO_RESTART | |
1662 | return ((info->flags & ASYNC_HUP_NOTIFY) ? | |
1663 | -EAGAIN : -ERESTARTSYS); | |
1664 | #else | |
1665 | return -EAGAIN; | |
1666 | #endif | |
1667 | } | |
1668 | ||
1669 | /* | |
1670 | * If non-blocking mode is set, or the port is not enabled, | |
1671 | * then make the check up front and then exit. | |
1672 | */ | |
1673 | if ((filp->f_flags & O_NONBLOCK) || | |
1674 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1675 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
1676 | return 0; | |
1677 | } | |
1678 | ||
1679 | if (tty->termios->c_cflag & CLOCAL) | |
1680 | do_clocal = 1; | |
1681 | ||
1682 | /* | |
1683 | * Block waiting for the carrier detect and the line to become | |
1684 | * free (i.e., not in use by the callout). While we are in | |
1685 | * this loop, state->count is dropped by one, so that | |
1686 | * rs_close() knows when to free things. We restore it upon | |
1687 | * exit, either normal or abnormal. | |
1688 | */ | |
1689 | retval = 0; | |
1690 | add_wait_queue(&info->open_wait, &wait); | |
1691 | #ifdef SERIAL_DEBUG_OPEN | |
1692 | printk("block_til_ready before block: ttys%d, count = %d\n", | |
1693 | state->line, state->count); | |
1694 | #endif | |
1695 | local_irq_save(flags); | |
1696 | if (!tty_hung_up_p(filp)) { | |
1697 | extra_count = 1; | |
1698 | state->count--; | |
1699 | } | |
1700 | local_irq_restore(flags); | |
1701 | info->blocked_open++; | |
1702 | while (1) { | |
1703 | local_irq_save(flags); | |
1704 | if (tty->termios->c_cflag & CBAUD) | |
1705 | rtsdtr_ctrl(SER_DTR|SER_RTS); | |
1706 | local_irq_restore(flags); | |
1707 | set_current_state(TASK_INTERRUPTIBLE); | |
1708 | if (tty_hung_up_p(filp) || | |
1709 | !(info->flags & ASYNC_INITIALIZED)) { | |
1710 | #ifdef SERIAL_DO_RESTART | |
1711 | if (info->flags & ASYNC_HUP_NOTIFY) | |
1712 | retval = -EAGAIN; | |
1713 | else | |
1714 | retval = -ERESTARTSYS; | |
1715 | #else | |
1716 | retval = -EAGAIN; | |
1717 | #endif | |
1718 | break; | |
1719 | } | |
1720 | if (!(info->flags & ASYNC_CLOSING) && | |
1721 | (do_clocal || (!(ciab.pra & SER_DCD)) )) | |
1722 | break; | |
1723 | if (signal_pending(current)) { | |
1724 | retval = -ERESTARTSYS; | |
1725 | break; | |
1726 | } | |
1727 | #ifdef SERIAL_DEBUG_OPEN | |
1728 | printk("block_til_ready blocking: ttys%d, count = %d\n", | |
1729 | info->line, state->count); | |
1730 | #endif | |
1731 | schedule(); | |
1732 | } | |
1733 | current->state = TASK_RUNNING; | |
1734 | remove_wait_queue(&info->open_wait, &wait); | |
1735 | if (extra_count) | |
1736 | state->count++; | |
1737 | info->blocked_open--; | |
1738 | #ifdef SERIAL_DEBUG_OPEN | |
1739 | printk("block_til_ready after blocking: ttys%d, count = %d\n", | |
1740 | info->line, state->count); | |
1741 | #endif | |
1742 | if (retval) | |
1743 | return retval; | |
1744 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
1745 | return 0; | |
1746 | } | |
1747 | ||
1748 | static int get_async_struct(int line, struct async_struct **ret_info) | |
1749 | { | |
1750 | struct async_struct *info; | |
1751 | struct serial_state *sstate; | |
1752 | ||
1753 | sstate = rs_table + line; | |
1754 | sstate->count++; | |
1755 | if (sstate->info) { | |
1756 | *ret_info = sstate->info; | |
1757 | return 0; | |
1758 | } | |
1759 | info = kmalloc(sizeof(struct async_struct), GFP_KERNEL); | |
1760 | if (!info) { | |
1761 | sstate->count--; | |
1762 | return -ENOMEM; | |
1763 | } | |
1764 | memset(info, 0, sizeof(struct async_struct)); | |
1765 | #ifdef DECLARE_WAITQUEUE | |
1766 | init_waitqueue_head(&info->open_wait); | |
1767 | init_waitqueue_head(&info->close_wait); | |
1768 | init_waitqueue_head(&info->delta_msr_wait); | |
1769 | #endif | |
1770 | info->magic = SERIAL_MAGIC; | |
1771 | info->port = sstate->port; | |
1772 | info->flags = sstate->flags; | |
1773 | info->xmit_fifo_size = sstate->xmit_fifo_size; | |
1774 | info->line = line; | |
1775 | tasklet_init(&info->tlet, do_softint, (unsigned long)info); | |
1776 | info->state = sstate; | |
1777 | if (sstate->info) { | |
1778 | kfree(info); | |
1779 | *ret_info = sstate->info; | |
1780 | return 0; | |
1781 | } | |
1782 | *ret_info = sstate->info = info; | |
1783 | return 0; | |
1784 | } | |
1785 | ||
1786 | /* | |
1787 | * This routine is called whenever a serial port is opened. It | |
1788 | * enables interrupts for a serial port, linking in its async structure into | |
1789 | * the IRQ chain. It also performs the serial-specific | |
1790 | * initialization for the tty structure. | |
1791 | */ | |
1792 | static int rs_open(struct tty_struct *tty, struct file * filp) | |
1793 | { | |
1794 | struct async_struct *info; | |
1795 | int retval, line; | |
1796 | unsigned long page; | |
1797 | ||
1798 | line = tty->index; | |
1799 | if ((line < 0) || (line >= NR_PORTS)) { | |
1800 | return -ENODEV; | |
1801 | } | |
1802 | retval = get_async_struct(line, &info); | |
1803 | if (retval) { | |
1804 | return retval; | |
1805 | } | |
1806 | tty->driver_data = info; | |
1807 | info->tty = tty; | |
1808 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1809 | return -ENODEV; | |
1810 | ||
1811 | #ifdef SERIAL_DEBUG_OPEN | |
1812 | printk("rs_open %s, count = %d\n", tty->name, info->state->count); | |
1813 | #endif | |
1814 | info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; | |
1815 | ||
1816 | if (!tmp_buf) { | |
1817 | page = get_zeroed_page(GFP_KERNEL); | |
1818 | if (!page) { | |
1819 | return -ENOMEM; | |
1820 | } | |
1821 | if (tmp_buf) | |
1822 | free_page(page); | |
1823 | else | |
1824 | tmp_buf = (unsigned char *) page; | |
1825 | } | |
1826 | ||
1827 | /* | |
1828 | * If the port is the middle of closing, bail out now | |
1829 | */ | |
1830 | if (tty_hung_up_p(filp) || | |
1831 | (info->flags & ASYNC_CLOSING)) { | |
1832 | if (info->flags & ASYNC_CLOSING) | |
1833 | interruptible_sleep_on(&info->close_wait); | |
1834 | #ifdef SERIAL_DO_RESTART | |
1835 | return ((info->flags & ASYNC_HUP_NOTIFY) ? | |
1836 | -EAGAIN : -ERESTARTSYS); | |
1837 | #else | |
1838 | return -EAGAIN; | |
1839 | #endif | |
1840 | } | |
1841 | ||
1842 | /* | |
1843 | * Start up serial port | |
1844 | */ | |
1845 | retval = startup(info); | |
1846 | if (retval) { | |
1847 | return retval; | |
1848 | } | |
1849 | ||
1850 | retval = block_til_ready(tty, filp, info); | |
1851 | if (retval) { | |
1852 | #ifdef SERIAL_DEBUG_OPEN | |
1853 | printk("rs_open returning after block_til_ready with %d\n", | |
1854 | retval); | |
1855 | #endif | |
1856 | return retval; | |
1857 | } | |
1858 | ||
1859 | #ifdef SERIAL_DEBUG_OPEN | |
1860 | printk("rs_open %s successful...", tty->name); | |
1861 | #endif | |
1862 | return 0; | |
1863 | } | |
1864 | ||
1865 | /* | |
1866 | * /proc fs routines.... | |
1867 | */ | |
1868 | ||
1869 | static inline int line_info(char *buf, struct serial_state *state) | |
1870 | { | |
1871 | struct async_struct *info = state->info, scr_info; | |
1872 | char stat_buf[30], control, status; | |
1873 | int ret; | |
1874 | unsigned long flags; | |
1875 | ||
1876 | ret = sprintf(buf, "%d: uart:amiga_builtin",state->line); | |
1877 | ||
1878 | /* | |
1879 | * Figure out the current RS-232 lines | |
1880 | */ | |
1881 | if (!info) { | |
1882 | info = &scr_info; /* This is just for serial_{in,out} */ | |
1883 | ||
1884 | info->magic = SERIAL_MAGIC; | |
1885 | info->flags = state->flags; | |
1886 | info->quot = 0; | |
1887 | info->tty = NULL; | |
1888 | } | |
1889 | local_irq_save(flags); | |
1890 | status = ciab.pra; | |
1891 | control = info ? info->MCR : status; | |
1892 | local_irq_restore(flags); | |
1893 | ||
1894 | stat_buf[0] = 0; | |
1895 | stat_buf[1] = 0; | |
1896 | if(!(control & SER_RTS)) | |
1897 | strcat(stat_buf, "|RTS"); | |
1898 | if(!(status & SER_CTS)) | |
1899 | strcat(stat_buf, "|CTS"); | |
1900 | if(!(control & SER_DTR)) | |
1901 | strcat(stat_buf, "|DTR"); | |
1902 | if(!(status & SER_DSR)) | |
1903 | strcat(stat_buf, "|DSR"); | |
1904 | if(!(status & SER_DCD)) | |
1905 | strcat(stat_buf, "|CD"); | |
1906 | ||
1907 | if (info->quot) { | |
1908 | ret += sprintf(buf+ret, " baud:%d", | |
1909 | state->baud_base / info->quot); | |
1910 | } | |
1911 | ||
1912 | ret += sprintf(buf+ret, " tx:%d rx:%d", | |
1913 | state->icount.tx, state->icount.rx); | |
1914 | ||
1915 | if (state->icount.frame) | |
1916 | ret += sprintf(buf+ret, " fe:%d", state->icount.frame); | |
1917 | ||
1918 | if (state->icount.parity) | |
1919 | ret += sprintf(buf+ret, " pe:%d", state->icount.parity); | |
1920 | ||
1921 | if (state->icount.brk) | |
1922 | ret += sprintf(buf+ret, " brk:%d", state->icount.brk); | |
1923 | ||
1924 | if (state->icount.overrun) | |
1925 | ret += sprintf(buf+ret, " oe:%d", state->icount.overrun); | |
1926 | ||
1927 | /* | |
1928 | * Last thing is the RS-232 status lines | |
1929 | */ | |
1930 | ret += sprintf(buf+ret, " %s\n", stat_buf+1); | |
1931 | return ret; | |
1932 | } | |
1933 | ||
1934 | static int rs_read_proc(char *page, char **start, off_t off, int count, | |
1935 | int *eof, void *data) | |
1936 | { | |
1937 | int len = 0, l; | |
1938 | off_t begin = 0; | |
1939 | ||
1940 | len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version); | |
1941 | l = line_info(page + len, &rs_table[0]); | |
1942 | len += l; | |
1943 | if (len+begin > off+count) | |
1944 | goto done; | |
1945 | if (len+begin < off) { | |
1946 | begin += len; | |
1947 | len = 0; | |
1948 | } | |
1949 | *eof = 1; | |
1950 | done: | |
1951 | if (off >= len+begin) | |
1952 | return 0; | |
1953 | *start = page + (off-begin); | |
1954 | return ((count < begin+len-off) ? count : begin+len-off); | |
1955 | } | |
1956 | ||
1957 | /* | |
1958 | * --------------------------------------------------------------------- | |
1959 | * rs_init() and friends | |
1960 | * | |
1961 | * rs_init() is called at boot-time to initialize the serial driver. | |
1962 | * --------------------------------------------------------------------- | |
1963 | */ | |
1964 | ||
1965 | /* | |
1966 | * This routine prints out the appropriate serial driver version | |
1967 | * number, and identifies which options were configured into this | |
1968 | * driver. | |
1969 | */ | |
1970 | static _INLINE_ void show_serial_version(void) | |
1971 | { | |
1972 | printk(KERN_INFO "%s version %s\n", serial_name, serial_version); | |
1973 | } | |
1974 | ||
1975 | ||
1da177e4 LT |
1976 | static struct tty_operations serial_ops = { |
1977 | .open = rs_open, | |
1978 | .close = rs_close, | |
1979 | .write = rs_write, | |
1980 | .put_char = rs_put_char, | |
1981 | .flush_chars = rs_flush_chars, | |
1982 | .write_room = rs_write_room, | |
1983 | .chars_in_buffer = rs_chars_in_buffer, | |
1984 | .flush_buffer = rs_flush_buffer, | |
1985 | .ioctl = rs_ioctl, | |
1986 | .throttle = rs_throttle, | |
1987 | .unthrottle = rs_unthrottle, | |
1988 | .set_termios = rs_set_termios, | |
1989 | .stop = rs_stop, | |
1990 | .start = rs_start, | |
1991 | .hangup = rs_hangup, | |
1992 | .break_ctl = rs_break, | |
1993 | .send_xchar = rs_send_xchar, | |
1994 | .wait_until_sent = rs_wait_until_sent, | |
1995 | .read_proc = rs_read_proc, | |
1996 | .tiocmget = rs_tiocmget, | |
1997 | .tiocmset = rs_tiocmset, | |
1998 | }; | |
1999 | ||
2000 | /* | |
2001 | * The serial driver boot-time initialization code! | |
2002 | */ | |
2003 | static int __init rs_init(void) | |
2004 | { | |
2005 | unsigned long flags; | |
2006 | struct serial_state * state; | |
2007 | ||
2008 | if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL)) | |
2009 | return -ENODEV; | |
2010 | ||
2011 | serial_driver = alloc_tty_driver(1); | |
2012 | if (!serial_driver) | |
2013 | return -ENOMEM; | |
2014 | ||
2015 | /* | |
2016 | * We request SERDAT and SERPER only, because the serial registers are | |
2017 | * too spreaded over the custom register space | |
2018 | */ | |
2019 | if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]")) | |
2020 | return -EBUSY; | |
2021 | ||
2022 | IRQ_ports = NULL; | |
2023 | ||
2024 | show_serial_version(); | |
2025 | ||
2026 | /* Initialize the tty_driver structure */ | |
2027 | ||
2028 | serial_driver->owner = THIS_MODULE; | |
2029 | serial_driver->driver_name = "amiserial"; | |
2030 | serial_driver->name = "ttyS"; | |
2031 | serial_driver->major = TTY_MAJOR; | |
2032 | serial_driver->minor_start = 64; | |
2033 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
2034 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
2035 | serial_driver->init_termios = tty_std_termios; | |
2036 | serial_driver->init_termios.c_cflag = | |
2037 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
2038 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
2039 | tty_set_operations(serial_driver, &serial_ops); | |
2040 | ||
2041 | if (tty_register_driver(serial_driver)) | |
2042 | panic("Couldn't register serial driver\n"); | |
2043 | ||
2044 | state = rs_table; | |
2045 | state->magic = SSTATE_MAGIC; | |
2046 | state->port = (int)&custom.serdatr; /* Just to give it a value */ | |
2047 | state->line = 0; | |
2048 | state->custom_divisor = 0; | |
2049 | state->close_delay = 5*HZ/10; | |
2050 | state->closing_wait = 30*HZ; | |
2051 | state->icount.cts = state->icount.dsr = | |
2052 | state->icount.rng = state->icount.dcd = 0; | |
2053 | state->icount.rx = state->icount.tx = 0; | |
2054 | state->icount.frame = state->icount.parity = 0; | |
2055 | state->icount.overrun = state->icount.brk = 0; | |
1da177e4 LT |
2056 | |
2057 | printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n", | |
2058 | state->line); | |
2059 | ||
2060 | /* Hardware set up */ | |
2061 | ||
2062 | state->baud_base = amiga_colorclock; | |
2063 | state->xmit_fifo_size = 1; | |
2064 | ||
2065 | local_irq_save(flags); | |
2066 | ||
2067 | /* set ISRs, and then disable the rx interrupts */ | |
2068 | request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); | |
2069 | request_irq(IRQ_AMIGA_RBF, ser_rx_int, SA_INTERRUPT, "serial RX", state); | |
2070 | ||
2071 | /* turn off Rx and Tx interrupts */ | |
2072 | custom.intena = IF_RBF | IF_TBE; | |
2073 | mb(); | |
2074 | ||
2075 | /* clear any pending interrupt */ | |
2076 | custom.intreq = IF_RBF | IF_TBE; | |
2077 | mb(); | |
2078 | ||
2079 | local_irq_restore(flags); | |
2080 | ||
2081 | /* | |
2082 | * set the appropriate directions for the modem control flags, | |
2083 | * and clear RTS and DTR | |
2084 | */ | |
2085 | ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ | |
2086 | ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ | |
2087 | ||
2088 | return 0; | |
2089 | } | |
2090 | ||
2091 | static __exit void rs_exit(void) | |
2092 | { | |
2093 | int error; | |
2094 | struct async_struct *info = rs_table[0].info; | |
2095 | ||
2096 | /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ | |
2097 | tasklet_kill(&info->tlet); | |
2098 | if ((error = tty_unregister_driver(serial_driver))) | |
2099 | printk("SERIAL: failed to unregister serial driver (%d)\n", | |
2100 | error); | |
2101 | put_tty_driver(serial_driver); | |
2102 | ||
2103 | if (info) { | |
2104 | rs_table[0].info = NULL; | |
2105 | kfree(info); | |
2106 | } | |
2107 | ||
2108 | if (tmp_buf) { | |
2109 | free_page((unsigned long) tmp_buf); | |
2110 | tmp_buf = NULL; | |
2111 | } | |
2112 | ||
2113 | release_mem_region(CUSTOM_PHYSADDR+0x30, 4); | |
2114 | } | |
2115 | ||
2116 | module_init(rs_init) | |
2117 | module_exit(rs_exit) | |
2118 | ||
2119 | ||
2120 | /* | |
2121 | * ------------------------------------------------------------ | |
2122 | * Serial console driver | |
2123 | * ------------------------------------------------------------ | |
2124 | */ | |
2125 | #ifdef CONFIG_SERIAL_CONSOLE | |
2126 | ||
2127 | static void amiga_serial_putc(char c) | |
2128 | { | |
2129 | custom.serdat = (unsigned char)c | 0x100; | |
2130 | while (!(custom.serdatr & 0x2000)) | |
2131 | barrier(); | |
2132 | } | |
2133 | ||
2134 | /* | |
2135 | * Print a string to the serial port trying not to disturb | |
2136 | * any possible real use of the port... | |
2137 | * | |
2138 | * The console must be locked when we get here. | |
2139 | */ | |
2140 | static void serial_console_write(struct console *co, const char *s, | |
2141 | unsigned count) | |
2142 | { | |
2143 | unsigned short intena = custom.intenar; | |
2144 | ||
2145 | custom.intena = IF_TBE; | |
2146 | ||
2147 | while (count--) { | |
2148 | if (*s == '\n') | |
2149 | amiga_serial_putc('\r'); | |
2150 | amiga_serial_putc(*s++); | |
2151 | } | |
2152 | ||
2153 | custom.intena = IF_SETCLR | (intena & IF_TBE); | |
2154 | } | |
2155 | ||
2156 | static struct tty_driver *serial_console_device(struct console *c, int *index) | |
2157 | { | |
2158 | *index = 0; | |
2159 | return serial_driver; | |
2160 | } | |
2161 | ||
2162 | static struct console sercons = { | |
2163 | .name = "ttyS", | |
2164 | .write = serial_console_write, | |
2165 | .device = serial_console_device, | |
2166 | .flags = CON_PRINTBUFFER, | |
2167 | .index = -1, | |
2168 | }; | |
2169 | ||
2170 | /* | |
2171 | * Register console. | |
2172 | */ | |
2173 | static int __init amiserial_console_init(void) | |
2174 | { | |
2175 | register_console(&sercons); | |
2176 | return 0; | |
2177 | } | |
2178 | console_initcall(amiserial_console_init); | |
2179 | #endif | |
2180 | ||
2181 | MODULE_LICENSE("GPL"); |