Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
d594027d | 82 | #include <linux/seq_file.h> |
1da177e4 LT |
83 | #include <linux/slab.h> |
84 | #include <linux/init.h> | |
85 | #include <linux/bitops.h> | |
826e8c8c | 86 | #include <linux/platform_device.h> |
1da177e4 LT |
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 | ||
b4290a23 | 97 | #define custom amiga_custom |
1da177e4 LT |
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 | ||
606d099c | 109 | static void change_speed(struct async_struct *info, struct ktermios *old); |
1da177e4 LT |
110 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); |
111 | ||
112 | ||
113 | static struct serial_state rs_table[1]; | |
114 | ||
fe971071 | 115 | #define NR_PORTS ARRAY_SIZE(rs_table) |
1da177e4 | 116 | |
1da177e4 LT |
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 | { | |
c9f19e96 | 175 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
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 | { | |
c9f19e96 | 195 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
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 | */ | |
41c28ff1 AB |
240 | static void rs_sched_event(struct async_struct *info, |
241 | int event) | |
1da177e4 LT |
242 | { |
243 | info->event |= 1 << event; | |
244 | tasklet_schedule(&info->tlet); | |
245 | } | |
246 | ||
41c28ff1 | 247 | static void receive_chars(struct async_struct *info) |
1da177e4 LT |
248 | { |
249 | int status; | |
250 | int serdatr; | |
251 | struct tty_struct *tty = info->tty; | |
33f0f88f | 252 | unsigned char ch, flag; |
1da177e4 | 253 | struct async_icount *icount; |
33f0f88f | 254 | int oe = 0; |
1da177e4 LT |
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; | |
1da177e4 LT |
270 | icount->rx++; |
271 | ||
272 | #ifdef SERIAL_DEBUG_INTR | |
273 | printk("DR%02x:%02x...", ch, status); | |
274 | #endif | |
33f0f88f | 275 | flag = TTY_NORMAL; |
1da177e4 LT |
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) | |
33f0f88f | 304 | goto out; |
1da177e4 LT |
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 | |
33f0f88f | 312 | flag = TTY_BREAK; |
1da177e4 LT |
313 | if (info->flags & ASYNC_SAK) |
314 | do_SAK(tty); | |
315 | } else if (status & UART_LSR_PE) | |
33f0f88f | 316 | flag = TTY_PARITY; |
1da177e4 | 317 | else if (status & UART_LSR_FE) |
33f0f88f | 318 | flag = TTY_FRAME; |
1da177e4 LT |
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 | */ | |
33f0f88f | 325 | oe = 1; |
1da177e4 LT |
326 | } |
327 | } | |
33f0f88f AC |
328 | tty_insert_flip_char(tty, ch, flag); |
329 | if (oe == 1) | |
330 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
1da177e4 | 331 | tty_flip_buffer_push(tty); |
33f0f88f AC |
332 | out: |
333 | return; | |
1da177e4 LT |
334 | } |
335 | ||
41c28ff1 | 336 | static void transmit_chars(struct async_struct *info) |
1da177e4 LT |
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 | ||
41c28ff1 | 376 | static void check_modem_status(struct async_struct *info) |
1da177e4 LT |
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 | ||
7d12e780 | 452 | static irqreturn_t ser_vbl_int( int irq, void *data) |
1da177e4 LT |
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 | ||
7d12e780 | 465 | static irqreturn_t ser_rx_int(int irq, void *dev_id) |
1da177e4 LT |
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 | ||
7d12e780 | 485 | static irqreturn_t ser_tx_int(int irq, void *dev_id) |
1da177e4 LT |
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 | ||
b963a844 | 532 | if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) |
1da177e4 | 533 | tty_wakeup(tty); |
1da177e4 LT |
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, | |
606d099c | 697 | struct ktermios *old_termios) |
1da177e4 LT |
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) { | |
db0ef08e | 743 | /* FIXME: Will need updating for new tty in the end */ |
1da177e4 LT |
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: | |
4b512d26 | 783 | * Does clearing IER_MSI imply that we should disable the VBL interrupt ? |
1da177e4 LT |
784 | */ |
785 | ||
786 | /* | |
787 | * Set up parity check flag | |
788 | */ | |
1da177e4 LT |
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 | ||
257afa3c | 837 | static int rs_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 | 838 | { |
d9ad7ef1 | 839 | struct async_struct *info; |
1da177e4 LT |
840 | unsigned long flags; |
841 | ||
d9ad7ef1 TJRMI |
842 | info = tty->driver_data; |
843 | ||
1da177e4 | 844 | if (serial_paranoia_check(info, tty->name, "rs_put_char")) |
257afa3c | 845 | return 0; |
1da177e4 | 846 | |
d9ad7ef1 | 847 | if (!info->xmit.buf) |
257afa3c | 848 | return 0; |
1da177e4 LT |
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); | |
257afa3c | 855 | return 0; |
1da177e4 LT |
856 | } |
857 | ||
858 | info->xmit.buf[info->xmit.head++] = ch; | |
859 | info->xmit.head &= SERIAL_XMIT_SIZE-1; | |
860 | local_irq_restore(flags); | |
257afa3c | 861 | return 1; |
1da177e4 LT |
862 | } |
863 | ||
864 | static void rs_flush_chars(struct tty_struct *tty) | |
865 | { | |
c9f19e96 | 866 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
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; | |
d9ad7ef1 | 891 | struct async_struct *info; |
1da177e4 LT |
892 | unsigned long flags; |
893 | ||
d9ad7ef1 TJRMI |
894 | info = tty->driver_data; |
895 | ||
1da177e4 LT |
896 | if (serial_paranoia_check(info, tty->name, "rs_write")) |
897 | return 0; | |
898 | ||
b3218a79 | 899 | if (!info->xmit.buf) |
1da177e4 LT |
900 | return 0; |
901 | ||
3abf3bed | 902 | local_irq_save(flags); |
1da177e4 LT |
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 | { | |
c9f19e96 | 939 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
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 | { | |
c9f19e96 | 948 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
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 | { | |
c9f19e96 | 957 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
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); | |
1da177e4 LT |
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 | { | |
c9f19e96 | 974 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
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 | { | |
c9f19e96 | 1009 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
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 | { | |
c9f19e96 | 1034 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
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, | |
ab14caec | 1066 | struct serial_struct __user * retinfo) |
1da177e4 LT |
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)); | |
ec79d605 | 1074 | tty_lock(); |
1da177e4 LT |
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; | |
ec79d605 | 1085 | tty_unlock(); |
1da177e4 LT |
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, | |
ab14caec | 1092 | struct serial_struct __user * new_info) |
1da177e4 LT |
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; | |
e18ce49b | 1101 | |
ec79d605 | 1102 | tty_lock(); |
1da177e4 LT |
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); | |
e18ce49b | 1108 | if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) { |
ec79d605 | 1109 | tty_unlock(); |
1da177e4 | 1110 | return -EINVAL; |
e18ce49b | 1111 | } |
1da177e4 LT |
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 | ||
e18ce49b | 1128 | if (new_serial.baud_base < 9600) { |
ec79d605 | 1129 | tty_unlock(); |
1da177e4 | 1130 | return -EINVAL; |
e18ce49b | 1131 | } |
1da177e4 LT |
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); | |
ec79d605 | 1165 | tty_unlock(); |
1da177e4 LT |
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 | */ | |
ab14caec | 1180 | static int get_lsr_info(struct async_struct * info, unsigned int __user *value) |
1da177e4 LT |
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 | ||
60b33c13 | 1197 | static int rs_tiocmget(struct tty_struct *tty) |
1da177e4 | 1198 | { |
c9f19e96 | 1199 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
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 | ||
20b9d177 AC |
1219 | static int rs_tiocmset(struct tty_struct *tty, unsigned int set, |
1220 | unsigned int clear) | |
1da177e4 | 1221 | { |
c9f19e96 | 1222 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
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 | */ | |
9e98966c | 1247 | static int rs_break(struct tty_struct *tty, int break_state) |
1da177e4 | 1248 | { |
c9f19e96 | 1249 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
1250 | unsigned long flags; |
1251 | ||
1252 | if (serial_paranoia_check(info, tty->name, "rs_break")) | |
970a8a51 | 1253 | return -EINVAL; |
1da177e4 LT |
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); | |
9e98966c | 1262 | return 0; |
1da177e4 LT |
1263 | } |
1264 | ||
0587102c AC |
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 | } | |
1da177e4 LT |
1295 | |
1296 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
1297 | unsigned int cmd, unsigned long arg) | |
1298 | { | |
c9f19e96 | 1299 | struct async_struct * info = tty->driver_data; |
1da177e4 | 1300 | struct async_icount cprev, cnow; /* kernel counter temps */ |
ab14caec | 1301 | void __user *argp = (void __user *)arg; |
1da177e4 LT |
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: | |
ab14caec | 1316 | return get_serial_info(info, argp); |
1da177e4 | 1317 | case TIOCSSERIAL: |
ab14caec | 1318 | return set_serial_info(info, argp); |
1da177e4 LT |
1319 | case TIOCSERCONFIG: |
1320 | return 0; | |
1321 | ||
1322 | case TIOCSERGETLSR: /* Get line status register */ | |
ab14caec | 1323 | return get_lsr_info(info, argp); |
1da177e4 LT |
1324 | |
1325 | case TIOCSERGSTRUCT: | |
ab14caec | 1326 | if (copy_to_user(argp, |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
606d099c | 1375 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 | 1376 | { |
c9f19e96 | 1377 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
1378 | unsigned long flags; |
1379 | unsigned int cflag = tty->termios->c_cflag; | |
1380 | ||
1da177e4 LT |
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 | { | |
c9f19e96 | 1437 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
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); | |
978e595f | 1510 | rs_flush_buffer(tty); |
1da177e4 LT |
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 | { | |
c9f19e96 | 1532 | struct async_struct * info = tty->driver_data; |
1da177e4 | 1533 | unsigned long orig_jiffies, char_time; |
20365219 | 1534 | int tty_was_locked = tty_locked(); |
1da177e4 LT |
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; | |
978e595f | 1544 | |
20365219 AB |
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(); | |
1da177e4 LT |
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 | } | |
cc0a8fbb | 1590 | __set_current_state(TASK_RUNNING); |
20365219 AB |
1591 | if (!tty_was_locked) |
1592 | tty_unlock(); | |
1da177e4 LT |
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 | { | |
c9f19e96 | 1603 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
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 | |
e142a31d | 1716 | tty_unlock(); |
1da177e4 | 1717 | schedule(); |
e142a31d | 1718 | tty_lock(); |
1da177e4 | 1719 | } |
cc0a8fbb | 1720 | __set_current_state(TASK_RUNNING); |
1da177e4 LT |
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 | } | |
dd00cc48 | 1746 | info = kzalloc(sizeof(struct async_struct), GFP_KERNEL); |
1da177e4 LT |
1747 | if (!info) { |
1748 | sstate->count--; | |
1749 | return -ENOMEM; | |
1750 | } | |
1da177e4 LT |
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; | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
d594027d | 1843 | static inline void line_info(struct seq_file *m, struct serial_state *state) |
1da177e4 LT |
1844 | { |
1845 | struct async_struct *info = state->info, scr_info; | |
1846 | char stat_buf[30], control, status; | |
1da177e4 LT |
1847 | unsigned long flags; |
1848 | ||
d594027d | 1849 | seq_printf(m, "%d: uart:amiga_builtin",state->line); |
1da177e4 LT |
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) { | |
d594027d | 1881 | seq_printf(m, " baud:%d", state->baud_base / info->quot); |
1da177e4 LT |
1882 | } |
1883 | ||
d594027d | 1884 | seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); |
1da177e4 LT |
1885 | |
1886 | if (state->icount.frame) | |
d594027d | 1887 | seq_printf(m, " fe:%d", state->icount.frame); |
1da177e4 LT |
1888 | |
1889 | if (state->icount.parity) | |
d594027d | 1890 | seq_printf(m, " pe:%d", state->icount.parity); |
1da177e4 LT |
1891 | |
1892 | if (state->icount.brk) | |
d594027d | 1893 | seq_printf(m, " brk:%d", state->icount.brk); |
1da177e4 LT |
1894 | |
1895 | if (state->icount.overrun) | |
d594027d | 1896 | seq_printf(m, " oe:%d", state->icount.overrun); |
1da177e4 LT |
1897 | |
1898 | /* | |
1899 | * Last thing is the RS-232 status lines | |
1900 | */ | |
d594027d | 1901 | seq_printf(m, " %s\n", stat_buf+1); |
1da177e4 LT |
1902 | } |
1903 | ||
d594027d | 1904 | static int rs_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1905 | { |
d594027d AD |
1906 | seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); |
1907 | line_info(m, &rs_table[0]); | |
1908 | return 0; | |
1da177e4 LT |
1909 | } |
1910 | ||
d594027d AD |
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 | ||
1da177e4 LT |
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 | */ | |
41c28ff1 | 1937 | static void show_serial_version(void) |
1da177e4 LT |
1938 | { |
1939 | printk(KERN_INFO "%s version %s\n", serial_name, serial_version); | |
1940 | } | |
1941 | ||
1942 | ||
b68e31d0 | 1943 | static const struct tty_operations serial_ops = { |
1da177e4 LT |
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, | |
1da177e4 LT |
1962 | .tiocmget = rs_tiocmget, |
1963 | .tiocmset = rs_tiocmset, | |
0587102c | 1964 | .get_icount = rs_get_icount, |
d594027d | 1965 | .proc_fops = &rs_proc_fops, |
1da177e4 LT |
1966 | }; |
1967 | ||
1968 | /* | |
1969 | * The serial driver boot-time initialization code! | |
1970 | */ | |
826e8c8c | 1971 | static int __init amiga_serial_probe(struct platform_device *pdev) |
1da177e4 LT |
1972 | { |
1973 | unsigned long flags; | |
1974 | struct serial_state * state; | |
5edc304f | 1975 | int error; |
1da177e4 | 1976 | |
1da177e4 LT |
1977 | serial_driver = alloc_tty_driver(1); |
1978 | if (!serial_driver) | |
1979 | return -ENOMEM; | |
1980 | ||
1da177e4 LT |
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 | ||
5edc304f GU |
2000 | error = tty_register_driver(serial_driver); |
2001 | if (error) | |
826e8c8c | 2002 | goto fail_put_tty_driver; |
1da177e4 LT |
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; | |
1da177e4 LT |
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 | ||
1da177e4 | 2025 | /* set ISRs, and then disable the rx interrupts */ |
5edc304f GU |
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; | |
1da177e4 | 2034 | |
c70c036f JL |
2035 | local_irq_save(flags); |
2036 | ||
1da177e4 LT |
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 | ||
826e8c8c GU |
2054 | platform_set_drvdata(pdev, state); |
2055 | ||
1da177e4 | 2056 | return 0; |
5edc304f GU |
2057 | |
2058 | fail_free_irq: | |
2059 | free_irq(IRQ_AMIGA_TBE, state); | |
2060 | fail_unregister: | |
2061 | tty_unregister_driver(serial_driver); | |
5edc304f GU |
2062 | fail_put_tty_driver: |
2063 | put_tty_driver(serial_driver); | |
2064 | return error; | |
1da177e4 LT |
2065 | } |
2066 | ||
826e8c8c | 2067 | static int __exit amiga_serial_remove(struct platform_device *pdev) |
1da177e4 LT |
2068 | { |
2069 | int error; | |
826e8c8c GU |
2070 | struct serial_state *state = platform_get_drvdata(pdev); |
2071 | struct async_struct *info = state->info; | |
1da177e4 LT |
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 | ||
826e8c8c GU |
2080 | rs_table[0].info = NULL; |
2081 | kfree(info); | |
1da177e4 | 2082 | |
5edc304f GU |
2083 | free_irq(IRQ_AMIGA_TBE, rs_table); |
2084 | free_irq(IRQ_AMIGA_RBF, rs_table); | |
2085 | ||
826e8c8c GU |
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); | |
1da177e4 LT |
2109 | } |
2110 | ||
826e8c8c | 2111 | module_exit(amiga_serial_exit); |
1da177e4 LT |
2112 | |
2113 | ||
d1a35e4d GU |
2114 | #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) |
2115 | ||
1da177e4 LT |
2116 | /* |
2117 | * ------------------------------------------------------------ | |
2118 | * Serial console driver | |
2119 | * ------------------------------------------------------------ | |
2120 | */ | |
1da177e4 LT |
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); | |
d1a35e4d GU |
2174 | |
2175 | #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ | |
1da177e4 LT |
2176 | |
2177 | MODULE_LICENSE("GPL"); | |
826e8c8c | 2178 | MODULE_ALIAS("platform:amiga-serial"); |