Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Serial driver for the amiga builtin port. |
3 | * | |
4 | * This code was created by taking serial.c version 4.30 from kernel | |
5 | * release 2.3.22, replacing all hardware related stuff with the | |
6 | * corresponding amiga hardware actions, and removing all irrelevant | |
7 | * code. As a consequence, it uses many of the constants and names | |
8 | * associated with the registers and bits of 16550 compatible UARTS - | |
9 | * but only to keep track of status, etc in the state variables. It | |
10 | * was done this was to make it easier to keep the code in line with | |
11 | * (non hardware specific) changes to serial.c. | |
12 | * | |
13 | * The port is registered with the tty driver as minor device 64, and | |
14 | * therefore other ports should should only use 65 upwards. | |
15 | * | |
16 | * Richard Lucock 28/12/99 | |
17 | * | |
18 | * Copyright (C) 1991, 1992 Linus Torvalds | |
19 | * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, | |
20 | * 1998, 1999 Theodore Ts'o | |
21 | * | |
22 | */ | |
23 | ||
24 | /* | |
25 | * Serial driver configuration section. Here are the various options: | |
26 | * | |
27 | * SERIAL_PARANOIA_CHECK | |
28 | * Check the magic number for the async_structure where | |
29 | * ever possible. | |
30 | */ | |
31 | ||
1da177e4 LT |
32 | #include <linux/delay.h> |
33 | ||
34 | #undef SERIAL_PARANOIA_CHECK | |
35 | #define SERIAL_DO_RESTART | |
36 | ||
37 | /* Set of debugging defines */ | |
38 | ||
39 | #undef SERIAL_DEBUG_INTR | |
40 | #undef SERIAL_DEBUG_OPEN | |
41 | #undef SERIAL_DEBUG_FLOW | |
42 | #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
43 | ||
44 | /* Sanity checks */ | |
45 | ||
1da177e4 LT |
46 | #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) |
47 | #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ | |
fef21073 | 48 | tty->name, (info->state->flags), serial_driver->refcount,info->count,tty->count,s) |
1da177e4 LT |
49 | #else |
50 | #define DBG_CNT(s) | |
51 | #endif | |
52 | ||
53 | /* | |
54 | * End of serial driver configuration section. | |
55 | */ | |
56 | ||
57 | #include <linux/module.h> | |
58 | ||
59 | #include <linux/types.h> | |
60 | #include <linux/serial.h> | |
61 | #include <linux/serialP.h> | |
62 | #include <linux/serial_reg.h> | |
63 | static char *serial_version = "4.30"; | |
64 | ||
65 | #include <linux/errno.h> | |
66 | #include <linux/signal.h> | |
67 | #include <linux/sched.h> | |
68 | #include <linux/kernel.h> | |
69 | #include <linux/timer.h> | |
70 | #include <linux/interrupt.h> | |
71 | #include <linux/tty.h> | |
72 | #include <linux/tty_flip.h> | |
73 | #include <linux/console.h> | |
74 | #include <linux/major.h> | |
75 | #include <linux/string.h> | |
76 | #include <linux/fcntl.h> | |
77 | #include <linux/ptrace.h> | |
78 | #include <linux/ioport.h> | |
79 | #include <linux/mm.h> | |
d594027d | 80 | #include <linux/seq_file.h> |
1da177e4 LT |
81 | #include <linux/slab.h> |
82 | #include <linux/init.h> | |
83 | #include <linux/bitops.h> | |
826e8c8c | 84 | #include <linux/platform_device.h> |
1da177e4 LT |
85 | |
86 | #include <asm/setup.h> | |
87 | ||
88 | #include <asm/system.h> | |
89 | ||
90 | #include <asm/irq.h> | |
91 | ||
92 | #include <asm/amigahw.h> | |
93 | #include <asm/amigaints.h> | |
94 | ||
b4290a23 | 95 | #define custom amiga_custom |
1da177e4 LT |
96 | static char *serial_name = "Amiga-builtin serial driver"; |
97 | ||
98 | static struct tty_driver *serial_driver; | |
99 | ||
100 | /* number of characters left in xmit buffer before we ask for more */ | |
101 | #define WAKEUP_CHARS 256 | |
102 | ||
1da177e4 LT |
103 | static unsigned char current_ctl_bits; |
104 | ||
606d099c | 105 | static void change_speed(struct async_struct *info, struct ktermios *old); |
1da177e4 LT |
106 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); |
107 | ||
108 | ||
109 | static struct serial_state rs_table[1]; | |
110 | ||
fe971071 | 111 | #define NR_PORTS ARRAY_SIZE(rs_table) |
1da177e4 | 112 | |
1da177e4 LT |
113 | #include <asm/uaccess.h> |
114 | ||
115 | #define serial_isroot() (capable(CAP_SYS_ADMIN)) | |
116 | ||
117 | ||
118 | static inline int serial_paranoia_check(struct async_struct *info, | |
119 | char *name, const char *routine) | |
120 | { | |
121 | #ifdef SERIAL_PARANOIA_CHECK | |
122 | static const char *badmagic = | |
123 | "Warning: bad magic number for serial struct (%s) in %s\n"; | |
124 | static const char *badinfo = | |
125 | "Warning: null async_struct for (%s) in %s\n"; | |
126 | ||
127 | if (!info) { | |
128 | printk(badinfo, name, routine); | |
129 | return 1; | |
130 | } | |
131 | if (info->magic != SERIAL_MAGIC) { | |
132 | printk(badmagic, name, routine); | |
133 | return 1; | |
134 | } | |
135 | #endif | |
136 | return 0; | |
137 | } | |
138 | ||
139 | /* some serial hardware definitions */ | |
140 | #define SDR_OVRUN (1<<15) | |
141 | #define SDR_RBF (1<<14) | |
142 | #define SDR_TBE (1<<13) | |
143 | #define SDR_TSRE (1<<12) | |
144 | ||
145 | #define SERPER_PARENB (1<<15) | |
146 | ||
147 | #define AC_SETCLR (1<<15) | |
148 | #define AC_UARTBRK (1<<11) | |
149 | ||
150 | #define SER_DTR (1<<7) | |
151 | #define SER_RTS (1<<6) | |
152 | #define SER_DCD (1<<5) | |
153 | #define SER_CTS (1<<4) | |
154 | #define SER_DSR (1<<3) | |
155 | ||
156 | static __inline__ void rtsdtr_ctrl(int bits) | |
157 | { | |
158 | ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); | |
159 | } | |
160 | ||
161 | /* | |
162 | * ------------------------------------------------------------ | |
163 | * rs_stop() and rs_start() | |
164 | * | |
165 | * This routines are called before setting or resetting tty->stopped. | |
166 | * They enable or disable transmitter interrupts, as necessary. | |
167 | * ------------------------------------------------------------ | |
168 | */ | |
169 | static void rs_stop(struct tty_struct *tty) | |
170 | { | |
c9f19e96 | 171 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
172 | unsigned long flags; |
173 | ||
174 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
175 | return; | |
176 | ||
177 | local_irq_save(flags); | |
178 | if (info->IER & UART_IER_THRI) { | |
179 | info->IER &= ~UART_IER_THRI; | |
180 | /* disable Tx interrupt and remove any pending interrupts */ | |
181 | custom.intena = IF_TBE; | |
182 | mb(); | |
183 | custom.intreq = IF_TBE; | |
184 | mb(); | |
185 | } | |
186 | local_irq_restore(flags); | |
187 | } | |
188 | ||
189 | static void rs_start(struct tty_struct *tty) | |
190 | { | |
c9f19e96 | 191 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
192 | unsigned long flags; |
193 | ||
194 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
195 | return; | |
196 | ||
197 | local_irq_save(flags); | |
198 | if (info->xmit.head != info->xmit.tail | |
199 | && info->xmit.buf | |
200 | && !(info->IER & UART_IER_THRI)) { | |
201 | info->IER |= UART_IER_THRI; | |
202 | custom.intena = IF_SETCLR | IF_TBE; | |
203 | mb(); | |
204 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
205 | custom.intreq = IF_SETCLR | IF_TBE; | |
206 | mb(); | |
207 | } | |
208 | local_irq_restore(flags); | |
209 | } | |
210 | ||
211 | /* | |
212 | * ---------------------------------------------------------------------- | |
213 | * | |
214 | * Here starts the interrupt handling routines. All of the following | |
215 | * subroutines are declared as inline and are folded into | |
216 | * rs_interrupt(). They were separated out for readability's sake. | |
217 | * | |
218 | * Note: rs_interrupt() is a "fast" interrupt, which means that it | |
219 | * runs with interrupts turned off. People who may want to modify | |
220 | * rs_interrupt() should try to keep the interrupt handler as fast as | |
221 | * possible. After you are done making modifications, it is not a bad | |
222 | * idea to do: | |
223 | * | |
224 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c | |
225 | * | |
226 | * and look at the resulting assemble code in serial.s. | |
227 | * | |
228 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
229 | * ----------------------------------------------------------------------- | |
230 | */ | |
231 | ||
41c28ff1 | 232 | static void receive_chars(struct async_struct *info) |
1da177e4 LT |
233 | { |
234 | int status; | |
235 | int serdatr; | |
236 | struct tty_struct *tty = info->tty; | |
33f0f88f | 237 | unsigned char ch, flag; |
1da177e4 | 238 | struct async_icount *icount; |
33f0f88f | 239 | int oe = 0; |
1da177e4 LT |
240 | |
241 | icount = &info->state->icount; | |
242 | ||
243 | status = UART_LSR_DR; /* We obviously have a character! */ | |
244 | serdatr = custom.serdatr; | |
245 | mb(); | |
246 | custom.intreq = IF_RBF; | |
247 | mb(); | |
248 | ||
249 | if((serdatr & 0x1ff) == 0) | |
250 | status |= UART_LSR_BI; | |
251 | if(serdatr & SDR_OVRUN) | |
252 | status |= UART_LSR_OE; | |
253 | ||
254 | ch = serdatr & 0xff; | |
1da177e4 LT |
255 | icount->rx++; |
256 | ||
257 | #ifdef SERIAL_DEBUG_INTR | |
258 | printk("DR%02x:%02x...", ch, status); | |
259 | #endif | |
33f0f88f | 260 | flag = TTY_NORMAL; |
1da177e4 LT |
261 | |
262 | /* | |
263 | * We don't handle parity or frame errors - but I have left | |
264 | * the code in, since I'm not sure that the errors can't be | |
265 | * detected. | |
266 | */ | |
267 | ||
268 | if (status & (UART_LSR_BI | UART_LSR_PE | | |
269 | UART_LSR_FE | UART_LSR_OE)) { | |
270 | /* | |
271 | * For statistics only | |
272 | */ | |
273 | if (status & UART_LSR_BI) { | |
274 | status &= ~(UART_LSR_FE | UART_LSR_PE); | |
275 | icount->brk++; | |
276 | } else if (status & UART_LSR_PE) | |
277 | icount->parity++; | |
278 | else if (status & UART_LSR_FE) | |
279 | icount->frame++; | |
280 | if (status & UART_LSR_OE) | |
281 | icount->overrun++; | |
282 | ||
283 | /* | |
284 | * Now check to see if character should be | |
285 | * ignored, and mask off conditions which | |
286 | * should be ignored. | |
287 | */ | |
288 | if (status & info->ignore_status_mask) | |
33f0f88f | 289 | goto out; |
1da177e4 LT |
290 | |
291 | status &= info->read_status_mask; | |
292 | ||
293 | if (status & (UART_LSR_BI)) { | |
294 | #ifdef SERIAL_DEBUG_INTR | |
295 | printk("handling break...."); | |
296 | #endif | |
33f0f88f | 297 | flag = TTY_BREAK; |
fef21073 | 298 | if (info->state->flags & ASYNC_SAK) |
1da177e4 LT |
299 | do_SAK(tty); |
300 | } else if (status & UART_LSR_PE) | |
33f0f88f | 301 | flag = TTY_PARITY; |
1da177e4 | 302 | else if (status & UART_LSR_FE) |
33f0f88f | 303 | flag = TTY_FRAME; |
1da177e4 LT |
304 | if (status & UART_LSR_OE) { |
305 | /* | |
306 | * Overrun is special, since it's | |
307 | * reported immediately, and doesn't | |
308 | * affect the current character | |
309 | */ | |
33f0f88f | 310 | oe = 1; |
1da177e4 LT |
311 | } |
312 | } | |
33f0f88f AC |
313 | tty_insert_flip_char(tty, ch, flag); |
314 | if (oe == 1) | |
315 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
1da177e4 | 316 | tty_flip_buffer_push(tty); |
33f0f88f AC |
317 | out: |
318 | return; | |
1da177e4 LT |
319 | } |
320 | ||
41c28ff1 | 321 | static void transmit_chars(struct async_struct *info) |
1da177e4 LT |
322 | { |
323 | custom.intreq = IF_TBE; | |
324 | mb(); | |
325 | if (info->x_char) { | |
326 | custom.serdat = info->x_char | 0x100; | |
327 | mb(); | |
328 | info->state->icount.tx++; | |
329 | info->x_char = 0; | |
330 | return; | |
331 | } | |
332 | if (info->xmit.head == info->xmit.tail | |
333 | || info->tty->stopped | |
334 | || info->tty->hw_stopped) { | |
335 | info->IER &= ~UART_IER_THRI; | |
336 | custom.intena = IF_TBE; | |
337 | mb(); | |
338 | return; | |
339 | } | |
340 | ||
341 | custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; | |
342 | mb(); | |
343 | info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); | |
344 | info->state->icount.tx++; | |
345 | ||
346 | if (CIRC_CNT(info->xmit.head, | |
347 | info->xmit.tail, | |
348 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) | |
c5f0508b | 349 | tty_wakeup(info->tty); |
1da177e4 LT |
350 | |
351 | #ifdef SERIAL_DEBUG_INTR | |
352 | printk("THRE..."); | |
353 | #endif | |
354 | if (info->xmit.head == info->xmit.tail) { | |
355 | custom.intena = IF_TBE; | |
356 | mb(); | |
357 | info->IER &= ~UART_IER_THRI; | |
358 | } | |
359 | } | |
360 | ||
41c28ff1 | 361 | static void check_modem_status(struct async_struct *info) |
1da177e4 LT |
362 | { |
363 | unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); | |
364 | unsigned char dstatus; | |
365 | struct async_icount *icount; | |
366 | ||
367 | /* Determine bits that have changed */ | |
368 | dstatus = status ^ current_ctl_bits; | |
369 | current_ctl_bits = status; | |
370 | ||
371 | if (dstatus) { | |
372 | icount = &info->state->icount; | |
373 | /* update input line counters */ | |
374 | if (dstatus & SER_DSR) | |
375 | icount->dsr++; | |
376 | if (dstatus & SER_DCD) { | |
377 | icount->dcd++; | |
378 | #ifdef CONFIG_HARD_PPS | |
fef21073 | 379 | if ((info->state->flags & ASYNC_HARDPPS_CD) && |
1da177e4 LT |
380 | !(status & SER_DCD)) |
381 | hardpps(); | |
382 | #endif | |
383 | } | |
384 | if (dstatus & SER_CTS) | |
385 | icount->cts++; | |
386 | wake_up_interruptible(&info->delta_msr_wait); | |
387 | } | |
388 | ||
fef21073 | 389 | if ((info->state->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) { |
1da177e4 LT |
390 | #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) |
391 | printk("ttyS%d CD now %s...", info->line, | |
392 | (!(status & SER_DCD)) ? "on" : "off"); | |
393 | #endif | |
394 | if (!(status & SER_DCD)) | |
395 | wake_up_interruptible(&info->open_wait); | |
396 | else { | |
397 | #ifdef SERIAL_DEBUG_OPEN | |
398 | printk("doing serial hangup..."); | |
399 | #endif | |
400 | if (info->tty) | |
401 | tty_hangup(info->tty); | |
402 | } | |
403 | } | |
fef21073 | 404 | if (info->state->flags & ASYNC_CTS_FLOW) { |
1da177e4 LT |
405 | if (info->tty->hw_stopped) { |
406 | if (!(status & SER_CTS)) { | |
407 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) | |
408 | printk("CTS tx start..."); | |
409 | #endif | |
410 | info->tty->hw_stopped = 0; | |
411 | info->IER |= UART_IER_THRI; | |
412 | custom.intena = IF_SETCLR | IF_TBE; | |
413 | mb(); | |
414 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
415 | custom.intreq = IF_SETCLR | IF_TBE; | |
416 | mb(); | |
c5f0508b | 417 | tty_wakeup(info->tty); |
1da177e4 LT |
418 | return; |
419 | } | |
420 | } else { | |
421 | if ((status & SER_CTS)) { | |
422 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) | |
423 | printk("CTS tx stop..."); | |
424 | #endif | |
425 | info->tty->hw_stopped = 1; | |
426 | info->IER &= ~UART_IER_THRI; | |
427 | /* disable Tx interrupt and remove any pending interrupts */ | |
428 | custom.intena = IF_TBE; | |
429 | mb(); | |
430 | custom.intreq = IF_TBE; | |
431 | mb(); | |
432 | } | |
433 | } | |
434 | } | |
435 | } | |
436 | ||
7d12e780 | 437 | static irqreturn_t ser_vbl_int( int irq, void *data) |
1da177e4 LT |
438 | { |
439 | /* vbl is just a periodic interrupt we tie into to update modem status */ | |
13c90621 | 440 | struct async_struct *info = data; |
1da177e4 LT |
441 | /* |
442 | * TBD - is it better to unregister from this interrupt or to | |
443 | * ignore it if MSI is clear ? | |
444 | */ | |
445 | if(info->IER & UART_IER_MSI) | |
446 | check_modem_status(info); | |
447 | return IRQ_HANDLED; | |
448 | } | |
449 | ||
7d12e780 | 450 | static irqreturn_t ser_rx_int(int irq, void *dev_id) |
1da177e4 | 451 | { |
13c90621 JS |
452 | struct serial_state *state = dev_id; |
453 | struct async_struct *info = state->info; | |
1da177e4 LT |
454 | |
455 | #ifdef SERIAL_DEBUG_INTR | |
456 | printk("ser_rx_int..."); | |
457 | #endif | |
458 | ||
1da177e4 LT |
459 | if (!info || !info->tty) |
460 | return IRQ_NONE; | |
461 | ||
462 | receive_chars(info); | |
1da177e4 LT |
463 | #ifdef SERIAL_DEBUG_INTR |
464 | printk("end.\n"); | |
465 | #endif | |
466 | return IRQ_HANDLED; | |
467 | } | |
468 | ||
7d12e780 | 469 | static irqreturn_t ser_tx_int(int irq, void *dev_id) |
1da177e4 | 470 | { |
13c90621 JS |
471 | struct serial_state *state = dev_id; |
472 | struct async_struct *info = state->info; | |
1da177e4 LT |
473 | |
474 | if (custom.serdatr & SDR_TBE) { | |
475 | #ifdef SERIAL_DEBUG_INTR | |
476 | printk("ser_tx_int..."); | |
477 | #endif | |
478 | ||
1da177e4 LT |
479 | if (!info || !info->tty) |
480 | return IRQ_NONE; | |
481 | ||
482 | transmit_chars(info); | |
1da177e4 LT |
483 | #ifdef SERIAL_DEBUG_INTR |
484 | printk("end.\n"); | |
485 | #endif | |
486 | } | |
487 | return IRQ_HANDLED; | |
488 | } | |
489 | ||
490 | /* | |
491 | * ------------------------------------------------------------------- | |
492 | * Here ends the serial interrupt routines. | |
493 | * ------------------------------------------------------------------- | |
494 | */ | |
495 | ||
1da177e4 LT |
496 | /* |
497 | * --------------------------------------------------------------- | |
498 | * Low level utility subroutines for the serial driver: routines to | |
499 | * figure out the appropriate timeout for an interrupt chain, routines | |
500 | * to initialize and startup a serial port, and routines to shutdown a | |
501 | * serial port. Useful stuff like that. | |
502 | * --------------------------------------------------------------- | |
503 | */ | |
504 | ||
505 | static int startup(struct async_struct * info) | |
506 | { | |
507 | unsigned long flags; | |
508 | int retval=0; | |
509 | unsigned long page; | |
510 | ||
511 | page = get_zeroed_page(GFP_KERNEL); | |
512 | if (!page) | |
513 | return -ENOMEM; | |
514 | ||
515 | local_irq_save(flags); | |
516 | ||
fef21073 | 517 | if (info->state->flags & ASYNC_INITIALIZED) { |
1da177e4 LT |
518 | free_page(page); |
519 | goto errout; | |
520 | } | |
521 | ||
522 | if (info->xmit.buf) | |
523 | free_page(page); | |
524 | else | |
525 | info->xmit.buf = (unsigned char *) page; | |
526 | ||
527 | #ifdef SERIAL_DEBUG_OPEN | |
528 | printk("starting up ttys%d ...", info->line); | |
529 | #endif | |
530 | ||
531 | /* Clear anything in the input buffer */ | |
532 | ||
533 | custom.intreq = IF_RBF; | |
534 | mb(); | |
535 | ||
536 | retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); | |
537 | if (retval) { | |
538 | if (serial_isroot()) { | |
539 | if (info->tty) | |
540 | set_bit(TTY_IO_ERROR, | |
541 | &info->tty->flags); | |
542 | retval = 0; | |
543 | } | |
544 | goto errout; | |
545 | } | |
546 | ||
547 | /* enable both Rx and Tx interrupts */ | |
548 | custom.intena = IF_SETCLR | IF_RBF | IF_TBE; | |
549 | mb(); | |
550 | info->IER = UART_IER_MSI; | |
551 | ||
552 | /* remember current state of the DCD and CTS bits */ | |
553 | current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); | |
554 | ||
1da177e4 LT |
555 | info->MCR = 0; |
556 | if (info->tty->termios->c_cflag & CBAUD) | |
557 | info->MCR = SER_DTR | SER_RTS; | |
558 | rtsdtr_ctrl(info->MCR); | |
559 | ||
560 | if (info->tty) | |
561 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
562 | info->xmit.head = info->xmit.tail = 0; | |
563 | ||
564 | /* | |
565 | * Set up the tty->alt_speed kludge | |
566 | */ | |
567 | if (info->tty) { | |
fef21073 | 568 | if ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
1da177e4 | 569 | info->tty->alt_speed = 57600; |
fef21073 | 570 | if ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
1da177e4 | 571 | info->tty->alt_speed = 115200; |
fef21073 | 572 | if ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
1da177e4 | 573 | info->tty->alt_speed = 230400; |
fef21073 | 574 | if ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
1da177e4 LT |
575 | info->tty->alt_speed = 460800; |
576 | } | |
577 | ||
578 | /* | |
579 | * and set the speed of the serial port | |
580 | */ | |
581 | change_speed(info, NULL); | |
582 | ||
fef21073 | 583 | info->state->flags |= ASYNC_INITIALIZED; |
1da177e4 LT |
584 | local_irq_restore(flags); |
585 | return 0; | |
586 | ||
587 | errout: | |
588 | local_irq_restore(flags); | |
589 | return retval; | |
590 | } | |
591 | ||
592 | /* | |
593 | * This routine will shutdown a serial port; interrupts are disabled, and | |
594 | * DTR is dropped if the hangup on close termio flag is on. | |
595 | */ | |
596 | static void shutdown(struct async_struct * info) | |
597 | { | |
598 | unsigned long flags; | |
599 | struct serial_state *state; | |
600 | ||
fef21073 | 601 | if (!(info->state->flags & ASYNC_INITIALIZED)) |
1da177e4 LT |
602 | return; |
603 | ||
604 | state = info->state; | |
605 | ||
606 | #ifdef SERIAL_DEBUG_OPEN | |
607 | printk("Shutting down serial port %d ....\n", info->line); | |
608 | #endif | |
609 | ||
610 | local_irq_save(flags); /* Disable interrupts */ | |
611 | ||
612 | /* | |
613 | * clear delta_msr_wait queue to avoid mem leaks: we may free the irq | |
614 | * here so the queue might never be waken up | |
615 | */ | |
616 | wake_up_interruptible(&info->delta_msr_wait); | |
617 | ||
1da177e4 LT |
618 | /* |
619 | * Free the IRQ, if necessary | |
620 | */ | |
621 | free_irq(IRQ_AMIGA_VERTB, info); | |
622 | ||
623 | if (info->xmit.buf) { | |
624 | free_page((unsigned long) info->xmit.buf); | |
625 | info->xmit.buf = NULL; | |
626 | } | |
627 | ||
628 | info->IER = 0; | |
629 | custom.intena = IF_RBF | IF_TBE; | |
630 | mb(); | |
631 | ||
632 | /* disable break condition */ | |
633 | custom.adkcon = AC_UARTBRK; | |
634 | mb(); | |
635 | ||
636 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) | |
637 | info->MCR &= ~(SER_DTR|SER_RTS); | |
638 | rtsdtr_ctrl(info->MCR); | |
639 | ||
640 | if (info->tty) | |
641 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
642 | ||
fef21073 | 643 | info->state->flags &= ~ASYNC_INITIALIZED; |
1da177e4 LT |
644 | local_irq_restore(flags); |
645 | } | |
646 | ||
647 | ||
648 | /* | |
649 | * This routine is called to set the UART divisor registers to match | |
650 | * the specified baud rate for a serial port. | |
651 | */ | |
652 | static void change_speed(struct async_struct *info, | |
606d099c | 653 | struct ktermios *old_termios) |
1da177e4 LT |
654 | { |
655 | int quot = 0, baud_base, baud; | |
656 | unsigned cflag, cval = 0; | |
657 | int bits; | |
658 | unsigned long flags; | |
659 | ||
660 | if (!info->tty || !info->tty->termios) | |
661 | return; | |
662 | cflag = info->tty->termios->c_cflag; | |
663 | ||
664 | /* Byte size is always 8 bits plus parity bit if requested */ | |
665 | ||
666 | cval = 3; bits = 10; | |
667 | if (cflag & CSTOPB) { | |
668 | cval |= 0x04; | |
669 | bits++; | |
670 | } | |
671 | if (cflag & PARENB) { | |
672 | cval |= UART_LCR_PARITY; | |
673 | bits++; | |
674 | } | |
675 | if (!(cflag & PARODD)) | |
676 | cval |= UART_LCR_EPAR; | |
677 | #ifdef CMSPAR | |
678 | if (cflag & CMSPAR) | |
679 | cval |= UART_LCR_SPAR; | |
680 | #endif | |
681 | ||
682 | /* Determine divisor based on baud rate */ | |
683 | baud = tty_get_baud_rate(info->tty); | |
684 | if (!baud) | |
685 | baud = 9600; /* B0 transition handled in rs_set_termios */ | |
686 | baud_base = info->state->baud_base; | |
687 | if (baud == 38400 && | |
fef21073 | 688 | ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) |
1da177e4 LT |
689 | quot = info->state->custom_divisor; |
690 | else { | |
691 | if (baud == 134) | |
692 | /* Special case since 134 is really 134.5 */ | |
693 | quot = (2*baud_base / 269); | |
694 | else if (baud) | |
695 | quot = baud_base / baud; | |
696 | } | |
697 | /* If the quotient is zero refuse the change */ | |
698 | if (!quot && old_termios) { | |
db0ef08e | 699 | /* FIXME: Will need updating for new tty in the end */ |
1da177e4 LT |
700 | info->tty->termios->c_cflag &= ~CBAUD; |
701 | info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD); | |
702 | baud = tty_get_baud_rate(info->tty); | |
703 | if (!baud) | |
704 | baud = 9600; | |
705 | if (baud == 38400 && | |
fef21073 | 706 | ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) |
1da177e4 LT |
707 | quot = info->state->custom_divisor; |
708 | else { | |
709 | if (baud == 134) | |
710 | /* Special case since 134 is really 134.5 */ | |
711 | quot = (2*baud_base / 269); | |
712 | else if (baud) | |
713 | quot = baud_base / baud; | |
714 | } | |
715 | } | |
716 | /* As a last resort, if the quotient is zero, default to 9600 bps */ | |
717 | if (!quot) | |
718 | quot = baud_base / 9600; | |
719 | info->quot = quot; | |
d8522563 | 720 | info->timeout = ((info->state->xmit_fifo_size*HZ*bits*quot) / baud_base); |
1da177e4 LT |
721 | info->timeout += HZ/50; /* Add .02 seconds of slop */ |
722 | ||
723 | /* CTS flow control flag and modem status interrupts */ | |
724 | info->IER &= ~UART_IER_MSI; | |
fef21073 | 725 | if (info->state->flags & ASYNC_HARDPPS_CD) |
1da177e4 LT |
726 | info->IER |= UART_IER_MSI; |
727 | if (cflag & CRTSCTS) { | |
fef21073 | 728 | info->state->flags |= ASYNC_CTS_FLOW; |
1da177e4 LT |
729 | info->IER |= UART_IER_MSI; |
730 | } else | |
fef21073 | 731 | info->state->flags &= ~ASYNC_CTS_FLOW; |
1da177e4 | 732 | if (cflag & CLOCAL) |
fef21073 | 733 | info->state->flags &= ~ASYNC_CHECK_CD; |
1da177e4 | 734 | else { |
fef21073 | 735 | info->state->flags |= ASYNC_CHECK_CD; |
1da177e4 LT |
736 | info->IER |= UART_IER_MSI; |
737 | } | |
738 | /* TBD: | |
4b512d26 | 739 | * Does clearing IER_MSI imply that we should disable the VBL interrupt ? |
1da177e4 LT |
740 | */ |
741 | ||
742 | /* | |
743 | * Set up parity check flag | |
744 | */ | |
1da177e4 LT |
745 | |
746 | info->read_status_mask = UART_LSR_OE | UART_LSR_DR; | |
747 | if (I_INPCK(info->tty)) | |
748 | info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
749 | if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) | |
750 | info->read_status_mask |= UART_LSR_BI; | |
751 | ||
752 | /* | |
753 | * Characters to ignore | |
754 | */ | |
755 | info->ignore_status_mask = 0; | |
756 | if (I_IGNPAR(info->tty)) | |
757 | info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
758 | if (I_IGNBRK(info->tty)) { | |
759 | info->ignore_status_mask |= UART_LSR_BI; | |
760 | /* | |
761 | * If we're ignore parity and break indicators, ignore | |
762 | * overruns too. (For real raw support). | |
763 | */ | |
764 | if (I_IGNPAR(info->tty)) | |
765 | info->ignore_status_mask |= UART_LSR_OE; | |
766 | } | |
767 | /* | |
768 | * !!! ignore all characters if CREAD is not set | |
769 | */ | |
770 | if ((cflag & CREAD) == 0) | |
771 | info->ignore_status_mask |= UART_LSR_DR; | |
772 | local_irq_save(flags); | |
773 | ||
774 | { | |
775 | short serper; | |
776 | ||
777 | /* Set up the baud rate */ | |
778 | serper = quot - 1; | |
779 | ||
780 | /* Enable or disable parity bit */ | |
781 | ||
782 | if(cval & UART_LCR_PARITY) | |
783 | serper |= (SERPER_PARENB); | |
784 | ||
785 | custom.serper = serper; | |
786 | mb(); | |
787 | } | |
788 | ||
1da177e4 LT |
789 | local_irq_restore(flags); |
790 | } | |
791 | ||
257afa3c | 792 | static int rs_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 | 793 | { |
d9ad7ef1 | 794 | struct async_struct *info; |
1da177e4 LT |
795 | unsigned long flags; |
796 | ||
d9ad7ef1 TJRMI |
797 | info = tty->driver_data; |
798 | ||
1da177e4 | 799 | if (serial_paranoia_check(info, tty->name, "rs_put_char")) |
257afa3c | 800 | return 0; |
1da177e4 | 801 | |
d9ad7ef1 | 802 | if (!info->xmit.buf) |
257afa3c | 803 | return 0; |
1da177e4 LT |
804 | |
805 | local_irq_save(flags); | |
806 | if (CIRC_SPACE(info->xmit.head, | |
807 | info->xmit.tail, | |
808 | SERIAL_XMIT_SIZE) == 0) { | |
809 | local_irq_restore(flags); | |
257afa3c | 810 | return 0; |
1da177e4 LT |
811 | } |
812 | ||
813 | info->xmit.buf[info->xmit.head++] = ch; | |
814 | info->xmit.head &= SERIAL_XMIT_SIZE-1; | |
815 | local_irq_restore(flags); | |
257afa3c | 816 | return 1; |
1da177e4 LT |
817 | } |
818 | ||
819 | static void rs_flush_chars(struct tty_struct *tty) | |
820 | { | |
c9f19e96 | 821 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
822 | unsigned long flags; |
823 | ||
824 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
825 | return; | |
826 | ||
827 | if (info->xmit.head == info->xmit.tail | |
828 | || tty->stopped | |
829 | || tty->hw_stopped | |
830 | || !info->xmit.buf) | |
831 | return; | |
832 | ||
833 | local_irq_save(flags); | |
834 | info->IER |= UART_IER_THRI; | |
835 | custom.intena = IF_SETCLR | IF_TBE; | |
836 | mb(); | |
837 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
838 | custom.intreq = IF_SETCLR | IF_TBE; | |
839 | mb(); | |
840 | local_irq_restore(flags); | |
841 | } | |
842 | ||
843 | static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) | |
844 | { | |
845 | int c, ret = 0; | |
d9ad7ef1 | 846 | struct async_struct *info; |
1da177e4 LT |
847 | unsigned long flags; |
848 | ||
d9ad7ef1 TJRMI |
849 | info = tty->driver_data; |
850 | ||
1da177e4 LT |
851 | if (serial_paranoia_check(info, tty->name, "rs_write")) |
852 | return 0; | |
853 | ||
b3218a79 | 854 | if (!info->xmit.buf) |
1da177e4 LT |
855 | return 0; |
856 | ||
3abf3bed | 857 | local_irq_save(flags); |
1da177e4 LT |
858 | while (1) { |
859 | c = CIRC_SPACE_TO_END(info->xmit.head, | |
860 | info->xmit.tail, | |
861 | SERIAL_XMIT_SIZE); | |
862 | if (count < c) | |
863 | c = count; | |
864 | if (c <= 0) { | |
865 | break; | |
866 | } | |
867 | memcpy(info->xmit.buf + info->xmit.head, buf, c); | |
868 | info->xmit.head = ((info->xmit.head + c) & | |
869 | (SERIAL_XMIT_SIZE-1)); | |
870 | buf += c; | |
871 | count -= c; | |
872 | ret += c; | |
873 | } | |
874 | local_irq_restore(flags); | |
875 | ||
876 | if (info->xmit.head != info->xmit.tail | |
877 | && !tty->stopped | |
878 | && !tty->hw_stopped | |
879 | && !(info->IER & UART_IER_THRI)) { | |
880 | info->IER |= UART_IER_THRI; | |
881 | local_irq_disable(); | |
882 | custom.intena = IF_SETCLR | IF_TBE; | |
883 | mb(); | |
884 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
885 | custom.intreq = IF_SETCLR | IF_TBE; | |
886 | mb(); | |
887 | local_irq_restore(flags); | |
888 | } | |
889 | return ret; | |
890 | } | |
891 | ||
892 | static int rs_write_room(struct tty_struct *tty) | |
893 | { | |
c9f19e96 | 894 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
895 | |
896 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
897 | return 0; | |
898 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
899 | } | |
900 | ||
901 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
902 | { | |
c9f19e96 | 903 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
904 | |
905 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
906 | return 0; | |
907 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
908 | } | |
909 | ||
910 | static void rs_flush_buffer(struct tty_struct *tty) | |
911 | { | |
c9f19e96 | 912 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
913 | unsigned long flags; |
914 | ||
915 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
916 | return; | |
917 | local_irq_save(flags); | |
918 | info->xmit.head = info->xmit.tail = 0; | |
919 | local_irq_restore(flags); | |
1da177e4 LT |
920 | tty_wakeup(tty); |
921 | } | |
922 | ||
923 | /* | |
924 | * This function is used to send a high-priority XON/XOFF character to | |
925 | * the device | |
926 | */ | |
927 | static void rs_send_xchar(struct tty_struct *tty, char ch) | |
928 | { | |
c9f19e96 | 929 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
930 | unsigned long flags; |
931 | ||
932 | if (serial_paranoia_check(info, tty->name, "rs_send_char")) | |
933 | return; | |
934 | ||
935 | info->x_char = ch; | |
936 | if (ch) { | |
937 | /* Make sure transmit interrupts are on */ | |
938 | ||
939 | /* Check this ! */ | |
940 | local_irq_save(flags); | |
941 | if(!(custom.intenar & IF_TBE)) { | |
942 | custom.intena = IF_SETCLR | IF_TBE; | |
943 | mb(); | |
944 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
945 | custom.intreq = IF_SETCLR | IF_TBE; | |
946 | mb(); | |
947 | } | |
948 | local_irq_restore(flags); | |
949 | ||
950 | info->IER |= UART_IER_THRI; | |
951 | } | |
952 | } | |
953 | ||
954 | /* | |
955 | * ------------------------------------------------------------ | |
956 | * rs_throttle() | |
957 | * | |
958 | * This routine is called by the upper-layer tty layer to signal that | |
959 | * incoming characters should be throttled. | |
960 | * ------------------------------------------------------------ | |
961 | */ | |
962 | static void rs_throttle(struct tty_struct * tty) | |
963 | { | |
c9f19e96 | 964 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
965 | unsigned long flags; |
966 | #ifdef SERIAL_DEBUG_THROTTLE | |
967 | char buf[64]; | |
968 | ||
969 | printk("throttle %s: %d....\n", tty_name(tty, buf), | |
970 | tty->ldisc.chars_in_buffer(tty)); | |
971 | #endif | |
972 | ||
973 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
974 | return; | |
975 | ||
976 | if (I_IXOFF(tty)) | |
977 | rs_send_xchar(tty, STOP_CHAR(tty)); | |
978 | ||
979 | if (tty->termios->c_cflag & CRTSCTS) | |
980 | info->MCR &= ~SER_RTS; | |
981 | ||
982 | local_irq_save(flags); | |
983 | rtsdtr_ctrl(info->MCR); | |
984 | local_irq_restore(flags); | |
985 | } | |
986 | ||
987 | static void rs_unthrottle(struct tty_struct * tty) | |
988 | { | |
c9f19e96 | 989 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
990 | unsigned long flags; |
991 | #ifdef SERIAL_DEBUG_THROTTLE | |
992 | char buf[64]; | |
993 | ||
994 | printk("unthrottle %s: %d....\n", tty_name(tty, buf), | |
995 | tty->ldisc.chars_in_buffer(tty)); | |
996 | #endif | |
997 | ||
998 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
999 | return; | |
1000 | ||
1001 | if (I_IXOFF(tty)) { | |
1002 | if (info->x_char) | |
1003 | info->x_char = 0; | |
1004 | else | |
1005 | rs_send_xchar(tty, START_CHAR(tty)); | |
1006 | } | |
1007 | if (tty->termios->c_cflag & CRTSCTS) | |
1008 | info->MCR |= SER_RTS; | |
1009 | local_irq_save(flags); | |
1010 | rtsdtr_ctrl(info->MCR); | |
1011 | local_irq_restore(flags); | |
1012 | } | |
1013 | ||
1014 | /* | |
1015 | * ------------------------------------------------------------ | |
1016 | * rs_ioctl() and friends | |
1017 | * ------------------------------------------------------------ | |
1018 | */ | |
1019 | ||
1020 | static int get_serial_info(struct async_struct * info, | |
ab14caec | 1021 | struct serial_struct __user * retinfo) |
1da177e4 LT |
1022 | { |
1023 | struct serial_struct tmp; | |
1024 | struct serial_state *state = info->state; | |
1025 | ||
1026 | if (!retinfo) | |
1027 | return -EFAULT; | |
1028 | memset(&tmp, 0, sizeof(tmp)); | |
ec79d605 | 1029 | tty_lock(); |
1da177e4 LT |
1030 | tmp.type = state->type; |
1031 | tmp.line = state->line; | |
1032 | tmp.port = state->port; | |
1033 | tmp.irq = state->irq; | |
1034 | tmp.flags = state->flags; | |
1035 | tmp.xmit_fifo_size = state->xmit_fifo_size; | |
1036 | tmp.baud_base = state->baud_base; | |
1037 | tmp.close_delay = state->close_delay; | |
1038 | tmp.closing_wait = state->closing_wait; | |
1039 | tmp.custom_divisor = state->custom_divisor; | |
ec79d605 | 1040 | tty_unlock(); |
1da177e4 LT |
1041 | if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) |
1042 | return -EFAULT; | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | static int set_serial_info(struct async_struct * info, | |
ab14caec | 1047 | struct serial_struct __user * new_info) |
1da177e4 LT |
1048 | { |
1049 | struct serial_struct new_serial; | |
1050 | struct serial_state old_state, *state; | |
1051 | unsigned int change_irq,change_port; | |
1052 | int retval = 0; | |
1053 | ||
1054 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) | |
1055 | return -EFAULT; | |
e18ce49b | 1056 | |
ec79d605 | 1057 | tty_lock(); |
1da177e4 LT |
1058 | state = info->state; |
1059 | old_state = *state; | |
1060 | ||
1061 | change_irq = new_serial.irq != state->irq; | |
1062 | change_port = (new_serial.port != state->port); | |
e18ce49b | 1063 | if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) { |
ec79d605 | 1064 | tty_unlock(); |
1da177e4 | 1065 | return -EINVAL; |
e18ce49b | 1066 | } |
1da177e4 LT |
1067 | |
1068 | if (!serial_isroot()) { | |
1069 | if ((new_serial.baud_base != state->baud_base) || | |
1070 | (new_serial.close_delay != state->close_delay) || | |
1071 | (new_serial.xmit_fifo_size != state->xmit_fifo_size) || | |
1072 | ((new_serial.flags & ~ASYNC_USR_MASK) != | |
1073 | (state->flags & ~ASYNC_USR_MASK))) | |
1074 | return -EPERM; | |
1075 | state->flags = ((state->flags & ~ASYNC_USR_MASK) | | |
1076 | (new_serial.flags & ASYNC_USR_MASK)); | |
1da177e4 LT |
1077 | state->custom_divisor = new_serial.custom_divisor; |
1078 | goto check_and_exit; | |
1079 | } | |
1080 | ||
e18ce49b | 1081 | if (new_serial.baud_base < 9600) { |
ec79d605 | 1082 | tty_unlock(); |
1da177e4 | 1083 | return -EINVAL; |
e18ce49b | 1084 | } |
1da177e4 LT |
1085 | |
1086 | /* | |
1087 | * OK, past this point, all the error checking has been done. | |
1088 | * At this point, we start making changes..... | |
1089 | */ | |
1090 | ||
1091 | state->baud_base = new_serial.baud_base; | |
1092 | state->flags = ((state->flags & ~ASYNC_FLAGS) | | |
1093 | (new_serial.flags & ASYNC_FLAGS)); | |
1da177e4 LT |
1094 | state->custom_divisor = new_serial.custom_divisor; |
1095 | state->close_delay = new_serial.close_delay * HZ/100; | |
1096 | state->closing_wait = new_serial.closing_wait * HZ/100; | |
fef21073 | 1097 | info->tty->low_latency = (state->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
1098 | |
1099 | check_and_exit: | |
fef21073 | 1100 | if (state->flags & ASYNC_INITIALIZED) { |
1da177e4 LT |
1101 | if (((old_state.flags & ASYNC_SPD_MASK) != |
1102 | (state->flags & ASYNC_SPD_MASK)) || | |
1103 | (old_state.custom_divisor != state->custom_divisor)) { | |
1104 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | |
1105 | info->tty->alt_speed = 57600; | |
1106 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | |
1107 | info->tty->alt_speed = 115200; | |
1108 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | |
1109 | info->tty->alt_speed = 230400; | |
1110 | if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | |
1111 | info->tty->alt_speed = 460800; | |
1112 | change_speed(info, NULL); | |
1113 | } | |
1114 | } else | |
1115 | retval = startup(info); | |
ec79d605 | 1116 | tty_unlock(); |
1da177e4 LT |
1117 | return retval; |
1118 | } | |
1119 | ||
1120 | ||
1121 | /* | |
1122 | * get_lsr_info - get line status register info | |
1123 | * | |
1124 | * Purpose: Let user call ioctl() to get info when the UART physically | |
1125 | * is emptied. On bus types like RS485, the transmitter must | |
1126 | * release the bus after transmitting. This must be done when | |
1127 | * the transmit shift register is empty, not be done when the | |
1128 | * transmit holding register is empty. This functionality | |
1129 | * allows an RS485 driver to be written in user space. | |
1130 | */ | |
ab14caec | 1131 | static int get_lsr_info(struct async_struct * info, unsigned int __user *value) |
1da177e4 LT |
1132 | { |
1133 | unsigned char status; | |
1134 | unsigned int result; | |
1135 | unsigned long flags; | |
1136 | ||
1137 | local_irq_save(flags); | |
1138 | status = custom.serdatr; | |
1139 | mb(); | |
1140 | local_irq_restore(flags); | |
1141 | result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); | |
1142 | if (copy_to_user(value, &result, sizeof(int))) | |
1143 | return -EFAULT; | |
1144 | return 0; | |
1145 | } | |
1146 | ||
1147 | ||
60b33c13 | 1148 | static int rs_tiocmget(struct tty_struct *tty) |
1da177e4 | 1149 | { |
c9f19e96 | 1150 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
1151 | unsigned char control, status; |
1152 | unsigned long flags; | |
1153 | ||
1154 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1155 | return -ENODEV; | |
1156 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1157 | return -EIO; | |
1158 | ||
1159 | control = info->MCR; | |
1160 | local_irq_save(flags); | |
1161 | status = ciab.pra; | |
1162 | local_irq_restore(flags); | |
1163 | return ((control & SER_RTS) ? TIOCM_RTS : 0) | |
1164 | | ((control & SER_DTR) ? TIOCM_DTR : 0) | |
1165 | | (!(status & SER_DCD) ? TIOCM_CAR : 0) | |
1166 | | (!(status & SER_DSR) ? TIOCM_DSR : 0) | |
1167 | | (!(status & SER_CTS) ? TIOCM_CTS : 0); | |
1168 | } | |
1169 | ||
20b9d177 AC |
1170 | static int rs_tiocmset(struct tty_struct *tty, unsigned int set, |
1171 | unsigned int clear) | |
1da177e4 | 1172 | { |
c9f19e96 | 1173 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
1174 | unsigned long flags; |
1175 | ||
1176 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1177 | return -ENODEV; | |
1178 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1179 | return -EIO; | |
1180 | ||
1181 | local_irq_save(flags); | |
1182 | if (set & TIOCM_RTS) | |
1183 | info->MCR |= SER_RTS; | |
1184 | if (set & TIOCM_DTR) | |
1185 | info->MCR |= SER_DTR; | |
1186 | if (clear & TIOCM_RTS) | |
1187 | info->MCR &= ~SER_RTS; | |
1188 | if (clear & TIOCM_DTR) | |
1189 | info->MCR &= ~SER_DTR; | |
1190 | rtsdtr_ctrl(info->MCR); | |
1191 | local_irq_restore(flags); | |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * rs_break() --- routine which turns the break handling on or off | |
1197 | */ | |
9e98966c | 1198 | static int rs_break(struct tty_struct *tty, int break_state) |
1da177e4 | 1199 | { |
c9f19e96 | 1200 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
1201 | unsigned long flags; |
1202 | ||
1203 | if (serial_paranoia_check(info, tty->name, "rs_break")) | |
970a8a51 | 1204 | return -EINVAL; |
1da177e4 LT |
1205 | |
1206 | local_irq_save(flags); | |
1207 | if (break_state == -1) | |
1208 | custom.adkcon = AC_SETCLR | AC_UARTBRK; | |
1209 | else | |
1210 | custom.adkcon = AC_UARTBRK; | |
1211 | mb(); | |
1212 | local_irq_restore(flags); | |
9e98966c | 1213 | return 0; |
1da177e4 LT |
1214 | } |
1215 | ||
0587102c AC |
1216 | /* |
1217 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1218 | * Return: write counters to the user passed counter struct | |
1219 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1220 | * RI where only 0->1 is counted. | |
1221 | */ | |
1222 | static int rs_get_icount(struct tty_struct *tty, | |
1223 | struct serial_icounter_struct *icount) | |
1224 | { | |
1225 | struct async_struct *info = tty->driver_data; | |
1226 | struct async_icount cnow; | |
1227 | unsigned long flags; | |
1228 | ||
1229 | local_irq_save(flags); | |
1230 | cnow = info->state->icount; | |
1231 | local_irq_restore(flags); | |
1232 | icount->cts = cnow.cts; | |
1233 | icount->dsr = cnow.dsr; | |
1234 | icount->rng = cnow.rng; | |
1235 | icount->dcd = cnow.dcd; | |
1236 | icount->rx = cnow.rx; | |
1237 | icount->tx = cnow.tx; | |
1238 | icount->frame = cnow.frame; | |
1239 | icount->overrun = cnow.overrun; | |
1240 | icount->parity = cnow.parity; | |
1241 | icount->brk = cnow.brk; | |
1242 | icount->buf_overrun = cnow.buf_overrun; | |
1243 | ||
1244 | return 0; | |
1245 | } | |
1da177e4 | 1246 | |
6caa76b7 | 1247 | static int rs_ioctl(struct tty_struct *tty, |
1da177e4 LT |
1248 | unsigned int cmd, unsigned long arg) |
1249 | { | |
c9f19e96 | 1250 | struct async_struct * info = tty->driver_data; |
1da177e4 | 1251 | struct async_icount cprev, cnow; /* kernel counter temps */ |
ab14caec | 1252 | void __user *argp = (void __user *)arg; |
1da177e4 LT |
1253 | unsigned long flags; |
1254 | ||
1255 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1256 | return -ENODEV; | |
1257 | ||
1258 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1259 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && | |
1260 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { | |
1261 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1262 | return -EIO; | |
1263 | } | |
1264 | ||
1265 | switch (cmd) { | |
1266 | case TIOCGSERIAL: | |
ab14caec | 1267 | return get_serial_info(info, argp); |
1da177e4 | 1268 | case TIOCSSERIAL: |
ab14caec | 1269 | return set_serial_info(info, argp); |
1da177e4 LT |
1270 | case TIOCSERCONFIG: |
1271 | return 0; | |
1272 | ||
1273 | case TIOCSERGETLSR: /* Get line status register */ | |
ab14caec | 1274 | return get_lsr_info(info, argp); |
1da177e4 LT |
1275 | |
1276 | case TIOCSERGSTRUCT: | |
ab14caec | 1277 | if (copy_to_user(argp, |
1da177e4 LT |
1278 | info, sizeof(struct async_struct))) |
1279 | return -EFAULT; | |
1280 | return 0; | |
1281 | ||
1282 | /* | |
1283 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1284 | * - mask passed in arg for lines of interest | |
1285 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1286 | * Caller should use TIOCGICOUNT to see which one it was | |
1287 | */ | |
1288 | case TIOCMIWAIT: | |
1289 | local_irq_save(flags); | |
1290 | /* note the counters on entry */ | |
1291 | cprev = info->state->icount; | |
1292 | local_irq_restore(flags); | |
1293 | while (1) { | |
1294 | interruptible_sleep_on(&info->delta_msr_wait); | |
1295 | /* see if a signal did it */ | |
1296 | if (signal_pending(current)) | |
1297 | return -ERESTARTSYS; | |
1298 | local_irq_save(flags); | |
1299 | cnow = info->state->icount; /* atomic copy */ | |
1300 | local_irq_restore(flags); | |
1301 | if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && | |
1302 | cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) | |
1303 | return -EIO; /* no change => error */ | |
1304 | if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
1305 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1306 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1307 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { | |
1308 | return 0; | |
1309 | } | |
1310 | cprev = cnow; | |
1311 | } | |
1312 | /* NOTREACHED */ | |
1313 | ||
1da177e4 LT |
1314 | case TIOCSERGWILD: |
1315 | case TIOCSERSWILD: | |
1316 | /* "setserial -W" is called in Debian boot */ | |
1317 | printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); | |
1318 | return 0; | |
1319 | ||
1320 | default: | |
1321 | return -ENOIOCTLCMD; | |
1322 | } | |
1323 | return 0; | |
1324 | } | |
1325 | ||
606d099c | 1326 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 | 1327 | { |
c9f19e96 | 1328 | struct async_struct *info = tty->driver_data; |
1da177e4 LT |
1329 | unsigned long flags; |
1330 | unsigned int cflag = tty->termios->c_cflag; | |
1331 | ||
1da177e4 LT |
1332 | change_speed(info, old_termios); |
1333 | ||
1334 | /* Handle transition to B0 status */ | |
1335 | if ((old_termios->c_cflag & CBAUD) && | |
1336 | !(cflag & CBAUD)) { | |
1337 | info->MCR &= ~(SER_DTR|SER_RTS); | |
1338 | local_irq_save(flags); | |
1339 | rtsdtr_ctrl(info->MCR); | |
1340 | local_irq_restore(flags); | |
1341 | } | |
1342 | ||
1343 | /* Handle transition away from B0 status */ | |
1344 | if (!(old_termios->c_cflag & CBAUD) && | |
1345 | (cflag & CBAUD)) { | |
1346 | info->MCR |= SER_DTR; | |
1347 | if (!(tty->termios->c_cflag & CRTSCTS) || | |
1348 | !test_bit(TTY_THROTTLED, &tty->flags)) { | |
1349 | info->MCR |= SER_RTS; | |
1350 | } | |
1351 | local_irq_save(flags); | |
1352 | rtsdtr_ctrl(info->MCR); | |
1353 | local_irq_restore(flags); | |
1354 | } | |
1355 | ||
1356 | /* Handle turning off CRTSCTS */ | |
1357 | if ((old_termios->c_cflag & CRTSCTS) && | |
1358 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1359 | tty->hw_stopped = 0; | |
1360 | rs_start(tty); | |
1361 | } | |
1362 | ||
1363 | #if 0 | |
1364 | /* | |
1365 | * No need to wake up processes in open wait, since they | |
1366 | * sample the CLOCAL flag once, and don't recheck it. | |
1367 | * XXX It's not clear whether the current behavior is correct | |
1368 | * or not. Hence, this may change..... | |
1369 | */ | |
1370 | if (!(old_termios->c_cflag & CLOCAL) && | |
1371 | (tty->termios->c_cflag & CLOCAL)) | |
1372 | wake_up_interruptible(&info->open_wait); | |
1373 | #endif | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * ------------------------------------------------------------ | |
1378 | * rs_close() | |
1379 | * | |
1380 | * This routine is called when the serial port gets closed. First, we | |
1381 | * wait for the last remaining data to be sent. Then, we unlink its | |
1382 | * async structure from the interrupt chain if necessary, and we free | |
1383 | * that IRQ if nothing is left in the chain. | |
1384 | * ------------------------------------------------------------ | |
1385 | */ | |
1386 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1387 | { | |
c9f19e96 | 1388 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
1389 | struct serial_state *state; |
1390 | unsigned long flags; | |
1391 | ||
1392 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1393 | return; | |
1394 | ||
1395 | state = info->state; | |
1396 | ||
1397 | local_irq_save(flags); | |
1398 | ||
1399 | if (tty_hung_up_p(filp)) { | |
1400 | DBG_CNT("before DEC-hung"); | |
1401 | local_irq_restore(flags); | |
1402 | return; | |
1403 | } | |
1404 | ||
1405 | #ifdef SERIAL_DEBUG_OPEN | |
1406 | printk("rs_close ttys%d, count = %d\n", info->line, state->count); | |
1407 | #endif | |
1408 | if ((tty->count == 1) && (state->count != 1)) { | |
1409 | /* | |
1410 | * Uh, oh. tty->count is 1, which means that the tty | |
1411 | * structure will be freed. state->count should always | |
1412 | * be one in these conditions. If it's greater than | |
1413 | * one, we've got real problems, since it means the | |
1414 | * serial port won't be shutdown. | |
1415 | */ | |
1416 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1417 | "state->count is %d\n", state->count); | |
1418 | state->count = 1; | |
1419 | } | |
1420 | if (--state->count < 0) { | |
1421 | printk("rs_close: bad serial port count for ttys%d: %d\n", | |
d8522563 | 1422 | state->line, state->count); |
1da177e4 LT |
1423 | state->count = 0; |
1424 | } | |
1425 | if (state->count) { | |
1426 | DBG_CNT("before DEC-2"); | |
1427 | local_irq_restore(flags); | |
1428 | return; | |
1429 | } | |
fef21073 | 1430 | state->flags |= ASYNC_CLOSING; |
1da177e4 LT |
1431 | /* |
1432 | * Now we wait for the transmit buffer to clear; and we notify | |
1433 | * the line discipline to only process XON/XOFF characters. | |
1434 | */ | |
1435 | tty->closing = 1; | |
d8522563 JS |
1436 | if (state->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
1437 | tty_wait_until_sent(tty, state->closing_wait); | |
1da177e4 LT |
1438 | /* |
1439 | * At this point we stop accepting input. To do this, we | |
1440 | * disable the receive line status interrupts, and tell the | |
1441 | * interrupt driver to stop checking the data ready bit in the | |
1442 | * line status register. | |
1443 | */ | |
1444 | info->read_status_mask &= ~UART_LSR_DR; | |
fef21073 | 1445 | if (state->flags & ASYNC_INITIALIZED) { |
1da177e4 LT |
1446 | /* disable receive interrupts */ |
1447 | custom.intena = IF_RBF; | |
1448 | mb(); | |
1449 | /* clear any pending receive interrupt */ | |
1450 | custom.intreq = IF_RBF; | |
1451 | mb(); | |
1452 | ||
1453 | /* | |
1454 | * Before we drop DTR, make sure the UART transmitter | |
1455 | * has completely drained; this is especially | |
1456 | * important if there is a transmit FIFO! | |
1457 | */ | |
1458 | rs_wait_until_sent(tty, info->timeout); | |
1459 | } | |
1460 | shutdown(info); | |
978e595f | 1461 | rs_flush_buffer(tty); |
1da177e4 LT |
1462 | |
1463 | tty_ldisc_flush(tty); | |
1464 | tty->closing = 0; | |
1da177e4 LT |
1465 | info->tty = NULL; |
1466 | if (info->blocked_open) { | |
d8522563 JS |
1467 | if (state->close_delay) { |
1468 | msleep_interruptible(jiffies_to_msecs(state->close_delay)); | |
1da177e4 LT |
1469 | } |
1470 | wake_up_interruptible(&info->open_wait); | |
1471 | } | |
fef21073 | 1472 | state->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
1da177e4 LT |
1473 | wake_up_interruptible(&info->close_wait); |
1474 | local_irq_restore(flags); | |
1475 | } | |
1476 | ||
1477 | /* | |
1478 | * rs_wait_until_sent() --- wait until the transmitter is empty | |
1479 | */ | |
1480 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
1481 | { | |
c9f19e96 | 1482 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
1483 | unsigned long orig_jiffies, char_time; |
1484 | int lsr; | |
1485 | ||
1486 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) | |
1487 | return; | |
1488 | ||
d8522563 | 1489 | if (info->state->xmit_fifo_size == 0) |
1da177e4 LT |
1490 | return; /* Just in case.... */ |
1491 | ||
1492 | orig_jiffies = jiffies; | |
978e595f | 1493 | |
1da177e4 LT |
1494 | /* |
1495 | * Set the check interval to be 1/5 of the estimated time to | |
1496 | * send a single character, and make it at least 1. The check | |
1497 | * interval should also be less than the timeout. | |
1498 | * | |
1499 | * Note: we have to use pretty tight timings here to satisfy | |
1500 | * the NIST-PCTS. | |
1501 | */ | |
d8522563 | 1502 | char_time = (info->timeout - HZ/50) / info->state->xmit_fifo_size; |
1da177e4 LT |
1503 | char_time = char_time / 5; |
1504 | if (char_time == 0) | |
1505 | char_time = 1; | |
1506 | if (timeout) | |
1507 | char_time = min_t(unsigned long, char_time, timeout); | |
1508 | /* | |
1509 | * If the transmitter hasn't cleared in twice the approximate | |
1510 | * amount of time to send the entire FIFO, it probably won't | |
1511 | * ever clear. This assumes the UART isn't doing flow | |
1512 | * control, which is currently the case. Hence, if it ever | |
1513 | * takes longer than info->timeout, this is probably due to a | |
1514 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1515 | * 2*info->timeout. | |
1516 | */ | |
1517 | if (!timeout || timeout > 2*info->timeout) | |
1518 | timeout = 2*info->timeout; | |
1519 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
1520 | printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); | |
1521 | printk("jiff=%lu...", jiffies); | |
1522 | #endif | |
1523 | while(!((lsr = custom.serdatr) & SDR_TSRE)) { | |
1524 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
1525 | printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); | |
1526 | #endif | |
1527 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1528 | if (signal_pending(current)) | |
1529 | break; | |
1530 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
1531 | break; | |
1532 | } | |
cc0a8fbb | 1533 | __set_current_state(TASK_RUNNING); |
eff4b0b9 | 1534 | |
1da177e4 LT |
1535 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
1536 | printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); | |
1537 | #endif | |
1538 | } | |
1539 | ||
1540 | /* | |
1541 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1542 | */ | |
1543 | static void rs_hangup(struct tty_struct *tty) | |
1544 | { | |
c9f19e96 | 1545 | struct async_struct * info = tty->driver_data; |
1da177e4 LT |
1546 | struct serial_state *state = info->state; |
1547 | ||
1548 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1549 | return; | |
1550 | ||
1551 | state = info->state; | |
1552 | ||
1553 | rs_flush_buffer(tty); | |
1554 | shutdown(info); | |
1da177e4 | 1555 | state->count = 0; |
fef21073 | 1556 | state->flags &= ~ASYNC_NORMAL_ACTIVE; |
1da177e4 LT |
1557 | info->tty = NULL; |
1558 | wake_up_interruptible(&info->open_wait); | |
1559 | } | |
1560 | ||
1561 | /* | |
1562 | * ------------------------------------------------------------ | |
1563 | * rs_open() and friends | |
1564 | * ------------------------------------------------------------ | |
1565 | */ | |
1566 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1567 | struct async_struct *info) | |
1568 | { | |
1569 | #ifdef DECLARE_WAITQUEUE | |
1570 | DECLARE_WAITQUEUE(wait, current); | |
1571 | #else | |
1572 | struct wait_queue wait = { current, NULL }; | |
1573 | #endif | |
1574 | struct serial_state *state = info->state; | |
1575 | int retval; | |
1576 | int do_clocal = 0, extra_count = 0; | |
1577 | unsigned long flags; | |
1578 | ||
1579 | /* | |
1580 | * If the device is in the middle of being closed, then block | |
1581 | * until it's done, and then try again. | |
1582 | */ | |
1583 | if (tty_hung_up_p(filp) || | |
fef21073 JS |
1584 | (state->flags & ASYNC_CLOSING)) { |
1585 | if (state->flags & ASYNC_CLOSING) | |
1da177e4 LT |
1586 | interruptible_sleep_on(&info->close_wait); |
1587 | #ifdef SERIAL_DO_RESTART | |
fef21073 | 1588 | return ((state->flags & ASYNC_HUP_NOTIFY) ? |
1da177e4 LT |
1589 | -EAGAIN : -ERESTARTSYS); |
1590 | #else | |
1591 | return -EAGAIN; | |
1592 | #endif | |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * If non-blocking mode is set, or the port is not enabled, | |
1597 | * then make the check up front and then exit. | |
1598 | */ | |
1599 | if ((filp->f_flags & O_NONBLOCK) || | |
1600 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
fef21073 | 1601 | state->flags |= ASYNC_NORMAL_ACTIVE; |
1da177e4 LT |
1602 | return 0; |
1603 | } | |
1604 | ||
1605 | if (tty->termios->c_cflag & CLOCAL) | |
1606 | do_clocal = 1; | |
1607 | ||
1608 | /* | |
1609 | * Block waiting for the carrier detect and the line to become | |
1610 | * free (i.e., not in use by the callout). While we are in | |
1611 | * this loop, state->count is dropped by one, so that | |
1612 | * rs_close() knows when to free things. We restore it upon | |
1613 | * exit, either normal or abnormal. | |
1614 | */ | |
1615 | retval = 0; | |
1616 | add_wait_queue(&info->open_wait, &wait); | |
1617 | #ifdef SERIAL_DEBUG_OPEN | |
1618 | printk("block_til_ready before block: ttys%d, count = %d\n", | |
1619 | state->line, state->count); | |
1620 | #endif | |
1621 | local_irq_save(flags); | |
1622 | if (!tty_hung_up_p(filp)) { | |
1623 | extra_count = 1; | |
1624 | state->count--; | |
1625 | } | |
1626 | local_irq_restore(flags); | |
1627 | info->blocked_open++; | |
1628 | while (1) { | |
1629 | local_irq_save(flags); | |
1630 | if (tty->termios->c_cflag & CBAUD) | |
1631 | rtsdtr_ctrl(SER_DTR|SER_RTS); | |
1632 | local_irq_restore(flags); | |
1633 | set_current_state(TASK_INTERRUPTIBLE); | |
1634 | if (tty_hung_up_p(filp) || | |
fef21073 | 1635 | !(state->flags & ASYNC_INITIALIZED)) { |
1da177e4 | 1636 | #ifdef SERIAL_DO_RESTART |
fef21073 | 1637 | if (state->flags & ASYNC_HUP_NOTIFY) |
1da177e4 LT |
1638 | retval = -EAGAIN; |
1639 | else | |
1640 | retval = -ERESTARTSYS; | |
1641 | #else | |
1642 | retval = -EAGAIN; | |
1643 | #endif | |
1644 | break; | |
1645 | } | |
fef21073 | 1646 | if (!(state->flags & ASYNC_CLOSING) && |
1da177e4 LT |
1647 | (do_clocal || (!(ciab.pra & SER_DCD)) )) |
1648 | break; | |
1649 | if (signal_pending(current)) { | |
1650 | retval = -ERESTARTSYS; | |
1651 | break; | |
1652 | } | |
1653 | #ifdef SERIAL_DEBUG_OPEN | |
1654 | printk("block_til_ready blocking: ttys%d, count = %d\n", | |
1655 | info->line, state->count); | |
1656 | #endif | |
e142a31d | 1657 | tty_unlock(); |
1da177e4 | 1658 | schedule(); |
e142a31d | 1659 | tty_lock(); |
1da177e4 | 1660 | } |
cc0a8fbb | 1661 | __set_current_state(TASK_RUNNING); |
1da177e4 LT |
1662 | remove_wait_queue(&info->open_wait, &wait); |
1663 | if (extra_count) | |
1664 | state->count++; | |
1665 | info->blocked_open--; | |
1666 | #ifdef SERIAL_DEBUG_OPEN | |
1667 | printk("block_til_ready after blocking: ttys%d, count = %d\n", | |
1668 | info->line, state->count); | |
1669 | #endif | |
1670 | if (retval) | |
1671 | return retval; | |
fef21073 | 1672 | state->flags |= ASYNC_NORMAL_ACTIVE; |
1da177e4 LT |
1673 | return 0; |
1674 | } | |
1675 | ||
1676 | static int get_async_struct(int line, struct async_struct **ret_info) | |
1677 | { | |
1678 | struct async_struct *info; | |
1679 | struct serial_state *sstate; | |
1680 | ||
1681 | sstate = rs_table + line; | |
1682 | sstate->count++; | |
1683 | if (sstate->info) { | |
1684 | *ret_info = sstate->info; | |
1685 | return 0; | |
1686 | } | |
dd00cc48 | 1687 | info = kzalloc(sizeof(struct async_struct), GFP_KERNEL); |
1da177e4 LT |
1688 | if (!info) { |
1689 | sstate->count--; | |
1690 | return -ENOMEM; | |
1691 | } | |
1da177e4 LT |
1692 | #ifdef DECLARE_WAITQUEUE |
1693 | init_waitqueue_head(&info->open_wait); | |
1694 | init_waitqueue_head(&info->close_wait); | |
1695 | init_waitqueue_head(&info->delta_msr_wait); | |
1696 | #endif | |
1da177e4 LT |
1697 | info->state = sstate; |
1698 | if (sstate->info) { | |
1699 | kfree(info); | |
1700 | *ret_info = sstate->info; | |
1701 | return 0; | |
1702 | } | |
1703 | *ret_info = sstate->info = info; | |
1704 | return 0; | |
1705 | } | |
1706 | ||
1707 | /* | |
1708 | * This routine is called whenever a serial port is opened. It | |
1709 | * enables interrupts for a serial port, linking in its async structure into | |
1710 | * the IRQ chain. It also performs the serial-specific | |
1711 | * initialization for the tty structure. | |
1712 | */ | |
1713 | static int rs_open(struct tty_struct *tty, struct file * filp) | |
1714 | { | |
1715 | struct async_struct *info; | |
410235fd | 1716 | int retval; |
1da177e4 | 1717 | |
410235fd | 1718 | retval = get_async_struct(tty->index, &info); |
1da177e4 LT |
1719 | if (retval) { |
1720 | return retval; | |
1721 | } | |
1722 | tty->driver_data = info; | |
1723 | info->tty = tty; | |
1724 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1725 | return -ENODEV; | |
1726 | ||
1727 | #ifdef SERIAL_DEBUG_OPEN | |
1728 | printk("rs_open %s, count = %d\n", tty->name, info->state->count); | |
1729 | #endif | |
fef21073 | 1730 | info->tty->low_latency = (info->state->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 | 1731 | |
1da177e4 LT |
1732 | /* |
1733 | * If the port is the middle of closing, bail out now | |
1734 | */ | |
1735 | if (tty_hung_up_p(filp) || | |
fef21073 JS |
1736 | (info->state->flags & ASYNC_CLOSING)) { |
1737 | if (info->state->flags & ASYNC_CLOSING) | |
1da177e4 LT |
1738 | interruptible_sleep_on(&info->close_wait); |
1739 | #ifdef SERIAL_DO_RESTART | |
fef21073 | 1740 | return ((info->state->flags & ASYNC_HUP_NOTIFY) ? |
1da177e4 LT |
1741 | -EAGAIN : -ERESTARTSYS); |
1742 | #else | |
1743 | return -EAGAIN; | |
1744 | #endif | |
1745 | } | |
1746 | ||
1747 | /* | |
1748 | * Start up serial port | |
1749 | */ | |
1750 | retval = startup(info); | |
1751 | if (retval) { | |
1752 | return retval; | |
1753 | } | |
1754 | ||
1755 | retval = block_til_ready(tty, filp, info); | |
1756 | if (retval) { | |
1757 | #ifdef SERIAL_DEBUG_OPEN | |
1758 | printk("rs_open returning after block_til_ready with %d\n", | |
1759 | retval); | |
1760 | #endif | |
1761 | return retval; | |
1762 | } | |
1763 | ||
1764 | #ifdef SERIAL_DEBUG_OPEN | |
1765 | printk("rs_open %s successful...", tty->name); | |
1766 | #endif | |
1767 | return 0; | |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * /proc fs routines.... | |
1772 | */ | |
1773 | ||
d594027d | 1774 | static inline void line_info(struct seq_file *m, struct serial_state *state) |
1da177e4 LT |
1775 | { |
1776 | struct async_struct *info = state->info, scr_info; | |
1777 | char stat_buf[30], control, status; | |
1da177e4 LT |
1778 | unsigned long flags; |
1779 | ||
d594027d | 1780 | seq_printf(m, "%d: uart:amiga_builtin",state->line); |
1da177e4 LT |
1781 | |
1782 | /* | |
1783 | * Figure out the current RS-232 lines | |
1784 | */ | |
1785 | if (!info) { | |
1786 | info = &scr_info; /* This is just for serial_{in,out} */ | |
1787 | ||
1da177e4 LT |
1788 | info->quot = 0; |
1789 | info->tty = NULL; | |
1790 | } | |
1791 | local_irq_save(flags); | |
1792 | status = ciab.pra; | |
1793 | control = info ? info->MCR : status; | |
1794 | local_irq_restore(flags); | |
1795 | ||
1796 | stat_buf[0] = 0; | |
1797 | stat_buf[1] = 0; | |
1798 | if(!(control & SER_RTS)) | |
1799 | strcat(stat_buf, "|RTS"); | |
1800 | if(!(status & SER_CTS)) | |
1801 | strcat(stat_buf, "|CTS"); | |
1802 | if(!(control & SER_DTR)) | |
1803 | strcat(stat_buf, "|DTR"); | |
1804 | if(!(status & SER_DSR)) | |
1805 | strcat(stat_buf, "|DSR"); | |
1806 | if(!(status & SER_DCD)) | |
1807 | strcat(stat_buf, "|CD"); | |
1808 | ||
1809 | if (info->quot) { | |
d594027d | 1810 | seq_printf(m, " baud:%d", state->baud_base / info->quot); |
1da177e4 LT |
1811 | } |
1812 | ||
d594027d | 1813 | seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); |
1da177e4 LT |
1814 | |
1815 | if (state->icount.frame) | |
d594027d | 1816 | seq_printf(m, " fe:%d", state->icount.frame); |
1da177e4 LT |
1817 | |
1818 | if (state->icount.parity) | |
d594027d | 1819 | seq_printf(m, " pe:%d", state->icount.parity); |
1da177e4 LT |
1820 | |
1821 | if (state->icount.brk) | |
d594027d | 1822 | seq_printf(m, " brk:%d", state->icount.brk); |
1da177e4 LT |
1823 | |
1824 | if (state->icount.overrun) | |
d594027d | 1825 | seq_printf(m, " oe:%d", state->icount.overrun); |
1da177e4 LT |
1826 | |
1827 | /* | |
1828 | * Last thing is the RS-232 status lines | |
1829 | */ | |
d594027d | 1830 | seq_printf(m, " %s\n", stat_buf+1); |
1da177e4 LT |
1831 | } |
1832 | ||
d594027d | 1833 | static int rs_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1834 | { |
d594027d AD |
1835 | seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); |
1836 | line_info(m, &rs_table[0]); | |
1837 | return 0; | |
1da177e4 LT |
1838 | } |
1839 | ||
d594027d AD |
1840 | static int rs_proc_open(struct inode *inode, struct file *file) |
1841 | { | |
1842 | return single_open(file, rs_proc_show, NULL); | |
1843 | } | |
1844 | ||
1845 | static const struct file_operations rs_proc_fops = { | |
1846 | .owner = THIS_MODULE, | |
1847 | .open = rs_proc_open, | |
1848 | .read = seq_read, | |
1849 | .llseek = seq_lseek, | |
1850 | .release = single_release, | |
1851 | }; | |
1852 | ||
1da177e4 LT |
1853 | /* |
1854 | * --------------------------------------------------------------------- | |
1855 | * rs_init() and friends | |
1856 | * | |
1857 | * rs_init() is called at boot-time to initialize the serial driver. | |
1858 | * --------------------------------------------------------------------- | |
1859 | */ | |
1860 | ||
1861 | /* | |
1862 | * This routine prints out the appropriate serial driver version | |
1863 | * number, and identifies which options were configured into this | |
1864 | * driver. | |
1865 | */ | |
41c28ff1 | 1866 | static void show_serial_version(void) |
1da177e4 LT |
1867 | { |
1868 | printk(KERN_INFO "%s version %s\n", serial_name, serial_version); | |
1869 | } | |
1870 | ||
1871 | ||
b68e31d0 | 1872 | static const struct tty_operations serial_ops = { |
1da177e4 LT |
1873 | .open = rs_open, |
1874 | .close = rs_close, | |
1875 | .write = rs_write, | |
1876 | .put_char = rs_put_char, | |
1877 | .flush_chars = rs_flush_chars, | |
1878 | .write_room = rs_write_room, | |
1879 | .chars_in_buffer = rs_chars_in_buffer, | |
1880 | .flush_buffer = rs_flush_buffer, | |
1881 | .ioctl = rs_ioctl, | |
1882 | .throttle = rs_throttle, | |
1883 | .unthrottle = rs_unthrottle, | |
1884 | .set_termios = rs_set_termios, | |
1885 | .stop = rs_stop, | |
1886 | .start = rs_start, | |
1887 | .hangup = rs_hangup, | |
1888 | .break_ctl = rs_break, | |
1889 | .send_xchar = rs_send_xchar, | |
1890 | .wait_until_sent = rs_wait_until_sent, | |
1da177e4 LT |
1891 | .tiocmget = rs_tiocmget, |
1892 | .tiocmset = rs_tiocmset, | |
0587102c | 1893 | .get_icount = rs_get_icount, |
d594027d | 1894 | .proc_fops = &rs_proc_fops, |
1da177e4 LT |
1895 | }; |
1896 | ||
1897 | /* | |
1898 | * The serial driver boot-time initialization code! | |
1899 | */ | |
826e8c8c | 1900 | static int __init amiga_serial_probe(struct platform_device *pdev) |
1da177e4 LT |
1901 | { |
1902 | unsigned long flags; | |
1903 | struct serial_state * state; | |
5edc304f | 1904 | int error; |
1da177e4 | 1905 | |
410235fd | 1906 | serial_driver = alloc_tty_driver(NR_PORTS); |
1da177e4 LT |
1907 | if (!serial_driver) |
1908 | return -ENOMEM; | |
1909 | ||
1da177e4 LT |
1910 | show_serial_version(); |
1911 | ||
1912 | /* Initialize the tty_driver structure */ | |
1913 | ||
1da177e4 LT |
1914 | serial_driver->driver_name = "amiserial"; |
1915 | serial_driver->name = "ttyS"; | |
1916 | serial_driver->major = TTY_MAJOR; | |
1917 | serial_driver->minor_start = 64; | |
1918 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1919 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1920 | serial_driver->init_termios = tty_std_termios; | |
1921 | serial_driver->init_termios.c_cflag = | |
1922 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
1923 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1924 | tty_set_operations(serial_driver, &serial_ops); | |
1925 | ||
5edc304f GU |
1926 | error = tty_register_driver(serial_driver); |
1927 | if (error) | |
826e8c8c | 1928 | goto fail_put_tty_driver; |
1da177e4 LT |
1929 | |
1930 | state = rs_table; | |
1da177e4 LT |
1931 | state->port = (int)&custom.serdatr; /* Just to give it a value */ |
1932 | state->line = 0; | |
1933 | state->custom_divisor = 0; | |
1934 | state->close_delay = 5*HZ/10; | |
1935 | state->closing_wait = 30*HZ; | |
1936 | state->icount.cts = state->icount.dsr = | |
1937 | state->icount.rng = state->icount.dcd = 0; | |
1938 | state->icount.rx = state->icount.tx = 0; | |
1939 | state->icount.frame = state->icount.parity = 0; | |
1940 | state->icount.overrun = state->icount.brk = 0; | |
1da177e4 LT |
1941 | |
1942 | printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n", | |
1943 | state->line); | |
1944 | ||
1945 | /* Hardware set up */ | |
1946 | ||
1947 | state->baud_base = amiga_colorclock; | |
1948 | state->xmit_fifo_size = 1; | |
1949 | ||
1da177e4 | 1950 | /* set ISRs, and then disable the rx interrupts */ |
5edc304f GU |
1951 | error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); |
1952 | if (error) | |
1953 | goto fail_unregister; | |
1954 | ||
9cfb5c05 | 1955 | error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, |
5edc304f GU |
1956 | "serial RX", state); |
1957 | if (error) | |
1958 | goto fail_free_irq; | |
1da177e4 | 1959 | |
c70c036f JL |
1960 | local_irq_save(flags); |
1961 | ||
1da177e4 LT |
1962 | /* turn off Rx and Tx interrupts */ |
1963 | custom.intena = IF_RBF | IF_TBE; | |
1964 | mb(); | |
1965 | ||
1966 | /* clear any pending interrupt */ | |
1967 | custom.intreq = IF_RBF | IF_TBE; | |
1968 | mb(); | |
1969 | ||
1970 | local_irq_restore(flags); | |
1971 | ||
1972 | /* | |
1973 | * set the appropriate directions for the modem control flags, | |
1974 | * and clear RTS and DTR | |
1975 | */ | |
1976 | ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ | |
1977 | ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ | |
1978 | ||
826e8c8c GU |
1979 | platform_set_drvdata(pdev, state); |
1980 | ||
1da177e4 | 1981 | return 0; |
5edc304f GU |
1982 | |
1983 | fail_free_irq: | |
1984 | free_irq(IRQ_AMIGA_TBE, state); | |
1985 | fail_unregister: | |
1986 | tty_unregister_driver(serial_driver); | |
5edc304f GU |
1987 | fail_put_tty_driver: |
1988 | put_tty_driver(serial_driver); | |
1989 | return error; | |
1da177e4 LT |
1990 | } |
1991 | ||
826e8c8c | 1992 | static int __exit amiga_serial_remove(struct platform_device *pdev) |
1da177e4 LT |
1993 | { |
1994 | int error; | |
826e8c8c GU |
1995 | struct serial_state *state = platform_get_drvdata(pdev); |
1996 | struct async_struct *info = state->info; | |
1da177e4 LT |
1997 | |
1998 | /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ | |
1da177e4 LT |
1999 | if ((error = tty_unregister_driver(serial_driver))) |
2000 | printk("SERIAL: failed to unregister serial driver (%d)\n", | |
2001 | error); | |
2002 | put_tty_driver(serial_driver); | |
2003 | ||
826e8c8c GU |
2004 | rs_table[0].info = NULL; |
2005 | kfree(info); | |
1da177e4 | 2006 | |
5edc304f GU |
2007 | free_irq(IRQ_AMIGA_TBE, rs_table); |
2008 | free_irq(IRQ_AMIGA_RBF, rs_table); | |
2009 | ||
826e8c8c GU |
2010 | platform_set_drvdata(pdev, NULL); |
2011 | ||
2012 | return error; | |
2013 | } | |
2014 | ||
2015 | static struct platform_driver amiga_serial_driver = { | |
2016 | .remove = __exit_p(amiga_serial_remove), | |
2017 | .driver = { | |
2018 | .name = "amiga-serial", | |
2019 | .owner = THIS_MODULE, | |
2020 | }, | |
2021 | }; | |
2022 | ||
2023 | static int __init amiga_serial_init(void) | |
2024 | { | |
2025 | return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe); | |
2026 | } | |
2027 | ||
2028 | module_init(amiga_serial_init); | |
2029 | ||
2030 | static void __exit amiga_serial_exit(void) | |
2031 | { | |
2032 | platform_driver_unregister(&amiga_serial_driver); | |
1da177e4 LT |
2033 | } |
2034 | ||
826e8c8c | 2035 | module_exit(amiga_serial_exit); |
1da177e4 LT |
2036 | |
2037 | ||
d1a35e4d GU |
2038 | #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) |
2039 | ||
1da177e4 LT |
2040 | /* |
2041 | * ------------------------------------------------------------ | |
2042 | * Serial console driver | |
2043 | * ------------------------------------------------------------ | |
2044 | */ | |
1da177e4 LT |
2045 | |
2046 | static void amiga_serial_putc(char c) | |
2047 | { | |
2048 | custom.serdat = (unsigned char)c | 0x100; | |
2049 | while (!(custom.serdatr & 0x2000)) | |
2050 | barrier(); | |
2051 | } | |
2052 | ||
2053 | /* | |
2054 | * Print a string to the serial port trying not to disturb | |
2055 | * any possible real use of the port... | |
2056 | * | |
2057 | * The console must be locked when we get here. | |
2058 | */ | |
2059 | static void serial_console_write(struct console *co, const char *s, | |
2060 | unsigned count) | |
2061 | { | |
2062 | unsigned short intena = custom.intenar; | |
2063 | ||
2064 | custom.intena = IF_TBE; | |
2065 | ||
2066 | while (count--) { | |
2067 | if (*s == '\n') | |
2068 | amiga_serial_putc('\r'); | |
2069 | amiga_serial_putc(*s++); | |
2070 | } | |
2071 | ||
2072 | custom.intena = IF_SETCLR | (intena & IF_TBE); | |
2073 | } | |
2074 | ||
2075 | static struct tty_driver *serial_console_device(struct console *c, int *index) | |
2076 | { | |
2077 | *index = 0; | |
2078 | return serial_driver; | |
2079 | } | |
2080 | ||
2081 | static struct console sercons = { | |
2082 | .name = "ttyS", | |
2083 | .write = serial_console_write, | |
2084 | .device = serial_console_device, | |
2085 | .flags = CON_PRINTBUFFER, | |
2086 | .index = -1, | |
2087 | }; | |
2088 | ||
2089 | /* | |
2090 | * Register console. | |
2091 | */ | |
2092 | static int __init amiserial_console_init(void) | |
2093 | { | |
2094 | register_console(&sercons); | |
2095 | return 0; | |
2096 | } | |
2097 | console_initcall(amiserial_console_init); | |
d1a35e4d GU |
2098 | |
2099 | #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ | |
1da177e4 LT |
2100 | |
2101 | MODULE_LICENSE("GPL"); | |
826e8c8c | 2102 | MODULE_ALIAS("platform:amiga-serial"); |