blob: b0a70461a12c9c19269b8fe6c443251960c131b1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#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>
65static 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>
Alexey Dobriyand5940272009-03-31 15:19:23 -070082#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#include <linux/slab.h>
Alexey Dobriyan405f5572009-07-11 22:08:37 +040084#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#include <linux/init.h>
86#include <linux/bitops.h>
Geert Uytterhoeven826e8c82009-04-05 13:12:30 +020087#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89#include <asm/setup.h>
90
91#include <asm/system.h>
92
93#include <asm/irq.h>
94
95#include <asm/amigahw.h>
96#include <asm/amigaints.h>
97
Al Virob4290a22006-01-12 01:06:12 -080098#define custom amiga_custom
Linus Torvalds1da177e2005-04-16 15:20:36 -070099static char *serial_name = "Amiga-builtin serial driver";
100
101static struct tty_driver *serial_driver;
102
103/* number of characters left in xmit buffer before we ask for more */
104#define WAKEUP_CHARS 256
105
106static struct async_struct *IRQ_ports;
107
108static unsigned char current_ctl_bits;
109
Alan Cox606d0992006-12-08 02:38:45 -0800110static void change_speed(struct async_struct *info, struct ktermios *old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
112
113
114static struct serial_state rs_table[1];
115
Tobias Klauserfe971072006-01-09 20:54:02 -0800116#define NR_PORTS ARRAY_SIZE(rs_table)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118#include <asm/uaccess.h>
119
120#define serial_isroot() (capable(CAP_SYS_ADMIN))
121
122
123static inline int serial_paranoia_check(struct async_struct *info,
124 char *name, const char *routine)
125{
126#ifdef SERIAL_PARANOIA_CHECK
127 static const char *badmagic =
128 "Warning: bad magic number for serial struct (%s) in %s\n";
129 static const char *badinfo =
130 "Warning: null async_struct for (%s) in %s\n";
131
132 if (!info) {
133 printk(badinfo, name, routine);
134 return 1;
135 }
136 if (info->magic != SERIAL_MAGIC) {
137 printk(badmagic, name, routine);
138 return 1;
139 }
140#endif
141 return 0;
142}
143
144/* some serial hardware definitions */
145#define SDR_OVRUN (1<<15)
146#define SDR_RBF (1<<14)
147#define SDR_TBE (1<<13)
148#define SDR_TSRE (1<<12)
149
150#define SERPER_PARENB (1<<15)
151
152#define AC_SETCLR (1<<15)
153#define AC_UARTBRK (1<<11)
154
155#define SER_DTR (1<<7)
156#define SER_RTS (1<<6)
157#define SER_DCD (1<<5)
158#define SER_CTS (1<<4)
159#define SER_DSR (1<<3)
160
161static __inline__ void rtsdtr_ctrl(int bits)
162{
163 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
164}
165
166/*
167 * ------------------------------------------------------------
168 * rs_stop() and rs_start()
169 *
170 * This routines are called before setting or resetting tty->stopped.
171 * They enable or disable transmitter interrupts, as necessary.
172 * ------------------------------------------------------------
173 */
174static void rs_stop(struct tty_struct *tty)
175{
Alan Coxc9f19e92009-01-02 13:47:26 +0000176 struct async_struct *info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 unsigned long flags;
178
179 if (serial_paranoia_check(info, tty->name, "rs_stop"))
180 return;
181
182 local_irq_save(flags);
183 if (info->IER & UART_IER_THRI) {
184 info->IER &= ~UART_IER_THRI;
185 /* disable Tx interrupt and remove any pending interrupts */
186 custom.intena = IF_TBE;
187 mb();
188 custom.intreq = IF_TBE;
189 mb();
190 }
191 local_irq_restore(flags);
192}
193
194static void rs_start(struct tty_struct *tty)
195{
Alan Coxc9f19e92009-01-02 13:47:26 +0000196 struct async_struct *info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 unsigned long flags;
198
199 if (serial_paranoia_check(info, tty->name, "rs_start"))
200 return;
201
202 local_irq_save(flags);
203 if (info->xmit.head != info->xmit.tail
204 && info->xmit.buf
205 && !(info->IER & UART_IER_THRI)) {
206 info->IER |= UART_IER_THRI;
207 custom.intena = IF_SETCLR | IF_TBE;
208 mb();
209 /* set a pending Tx Interrupt, transmitter should restart now */
210 custom.intreq = IF_SETCLR | IF_TBE;
211 mb();
212 }
213 local_irq_restore(flags);
214}
215
216/*
217 * ----------------------------------------------------------------------
218 *
219 * Here starts the interrupt handling routines. All of the following
220 * subroutines are declared as inline and are folded into
221 * rs_interrupt(). They were separated out for readability's sake.
222 *
223 * Note: rs_interrupt() is a "fast" interrupt, which means that it
224 * runs with interrupts turned off. People who may want to modify
225 * rs_interrupt() should try to keep the interrupt handler as fast as
226 * possible. After you are done making modifications, it is not a bad
227 * idea to do:
228 *
229 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
230 *
231 * and look at the resulting assemble code in serial.s.
232 *
233 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
234 * -----------------------------------------------------------------------
235 */
236
237/*
238 * This routine is used by the interrupt handler to schedule
239 * processing in the software interrupt portion of the driver.
240 */
Adrian Bunk41c28ff2006-03-23 03:00:56 -0800241static void rs_sched_event(struct async_struct *info,
242 int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
244 info->event |= 1 << event;
245 tasklet_schedule(&info->tlet);
246}
247
Adrian Bunk41c28ff2006-03-23 03:00:56 -0800248static void receive_chars(struct async_struct *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
250 int status;
251 int serdatr;
252 struct tty_struct *tty = info->tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800253 unsigned char ch, flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 struct async_icount *icount;
Alan Cox33f0f882006-01-09 20:54:13 -0800255 int oe = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 icount = &info->state->icount;
258
259 status = UART_LSR_DR; /* We obviously have a character! */
260 serdatr = custom.serdatr;
261 mb();
262 custom.intreq = IF_RBF;
263 mb();
264
265 if((serdatr & 0x1ff) == 0)
266 status |= UART_LSR_BI;
267 if(serdatr & SDR_OVRUN)
268 status |= UART_LSR_OE;
269
270 ch = serdatr & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 icount->rx++;
272
273#ifdef SERIAL_DEBUG_INTR
274 printk("DR%02x:%02x...", ch, status);
275#endif
Alan Cox33f0f882006-01-09 20:54:13 -0800276 flag = TTY_NORMAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
278 /*
279 * We don't handle parity or frame errors - but I have left
280 * the code in, since I'm not sure that the errors can't be
281 * detected.
282 */
283
284 if (status & (UART_LSR_BI | UART_LSR_PE |
285 UART_LSR_FE | UART_LSR_OE)) {
286 /*
287 * For statistics only
288 */
289 if (status & UART_LSR_BI) {
290 status &= ~(UART_LSR_FE | UART_LSR_PE);
291 icount->brk++;
292 } else if (status & UART_LSR_PE)
293 icount->parity++;
294 else if (status & UART_LSR_FE)
295 icount->frame++;
296 if (status & UART_LSR_OE)
297 icount->overrun++;
298
299 /*
300 * Now check to see if character should be
301 * ignored, and mask off conditions which
302 * should be ignored.
303 */
304 if (status & info->ignore_status_mask)
Alan Cox33f0f882006-01-09 20:54:13 -0800305 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 status &= info->read_status_mask;
308
309 if (status & (UART_LSR_BI)) {
310#ifdef SERIAL_DEBUG_INTR
311 printk("handling break....");
312#endif
Alan Cox33f0f882006-01-09 20:54:13 -0800313 flag = TTY_BREAK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 if (info->flags & ASYNC_SAK)
315 do_SAK(tty);
316 } else if (status & UART_LSR_PE)
Alan Cox33f0f882006-01-09 20:54:13 -0800317 flag = TTY_PARITY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 else if (status & UART_LSR_FE)
Alan Cox33f0f882006-01-09 20:54:13 -0800319 flag = TTY_FRAME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 if (status & UART_LSR_OE) {
321 /*
322 * Overrun is special, since it's
323 * reported immediately, and doesn't
324 * affect the current character
325 */
Alan Cox33f0f882006-01-09 20:54:13 -0800326 oe = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 }
328 }
Alan Cox33f0f882006-01-09 20:54:13 -0800329 tty_insert_flip_char(tty, ch, flag);
330 if (oe == 1)
331 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 tty_flip_buffer_push(tty);
Alan Cox33f0f882006-01-09 20:54:13 -0800333out:
334 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335}
336
Adrian Bunk41c28ff2006-03-23 03:00:56 -0800337static void transmit_chars(struct async_struct *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
339 custom.intreq = IF_TBE;
340 mb();
341 if (info->x_char) {
342 custom.serdat = info->x_char | 0x100;
343 mb();
344 info->state->icount.tx++;
345 info->x_char = 0;
346 return;
347 }
348 if (info->xmit.head == info->xmit.tail
349 || info->tty->stopped
350 || info->tty->hw_stopped) {
351 info->IER &= ~UART_IER_THRI;
352 custom.intena = IF_TBE;
353 mb();
354 return;
355 }
356
357 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
358 mb();
359 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
360 info->state->icount.tx++;
361
362 if (CIRC_CNT(info->xmit.head,
363 info->xmit.tail,
364 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
365 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
366
367#ifdef SERIAL_DEBUG_INTR
368 printk("THRE...");
369#endif
370 if (info->xmit.head == info->xmit.tail) {
371 custom.intena = IF_TBE;
372 mb();
373 info->IER &= ~UART_IER_THRI;
374 }
375}
376
Adrian Bunk41c28ff2006-03-23 03:00:56 -0800377static void check_modem_status(struct async_struct *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378{
379 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
380 unsigned char dstatus;
381 struct async_icount *icount;
382
383 /* Determine bits that have changed */
384 dstatus = status ^ current_ctl_bits;
385 current_ctl_bits = status;
386
387 if (dstatus) {
388 icount = &info->state->icount;
389 /* update input line counters */
390 if (dstatus & SER_DSR)
391 icount->dsr++;
392 if (dstatus & SER_DCD) {
393 icount->dcd++;
394#ifdef CONFIG_HARD_PPS
395 if ((info->flags & ASYNC_HARDPPS_CD) &&
396 !(status & SER_DCD))
397 hardpps();
398#endif
399 }
400 if (dstatus & SER_CTS)
401 icount->cts++;
402 wake_up_interruptible(&info->delta_msr_wait);
403 }
404
405 if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
406#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
407 printk("ttyS%d CD now %s...", info->line,
408 (!(status & SER_DCD)) ? "on" : "off");
409#endif
410 if (!(status & SER_DCD))
411 wake_up_interruptible(&info->open_wait);
412 else {
413#ifdef SERIAL_DEBUG_OPEN
414 printk("doing serial hangup...");
415#endif
416 if (info->tty)
417 tty_hangup(info->tty);
418 }
419 }
420 if (info->flags & ASYNC_CTS_FLOW) {
421 if (info->tty->hw_stopped) {
422 if (!(status & SER_CTS)) {
423#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
424 printk("CTS tx start...");
425#endif
426 info->tty->hw_stopped = 0;
427 info->IER |= UART_IER_THRI;
428 custom.intena = IF_SETCLR | IF_TBE;
429 mb();
430 /* set a pending Tx Interrupt, transmitter should restart now */
431 custom.intreq = IF_SETCLR | IF_TBE;
432 mb();
433 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
434 return;
435 }
436 } else {
437 if ((status & SER_CTS)) {
438#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
439 printk("CTS tx stop...");
440#endif
441 info->tty->hw_stopped = 1;
442 info->IER &= ~UART_IER_THRI;
443 /* disable Tx interrupt and remove any pending interrupts */
444 custom.intena = IF_TBE;
445 mb();
446 custom.intreq = IF_TBE;
447 mb();
448 }
449 }
450 }
451}
452
David Howells7d12e782006-10-05 14:55:46 +0100453static irqreturn_t ser_vbl_int( int irq, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454{
455 /* vbl is just a periodic interrupt we tie into to update modem status */
456 struct async_struct * info = IRQ_ports;
457 /*
458 * TBD - is it better to unregister from this interrupt or to
459 * ignore it if MSI is clear ?
460 */
461 if(info->IER & UART_IER_MSI)
462 check_modem_status(info);
463 return IRQ_HANDLED;
464}
465
David Howells7d12e782006-10-05 14:55:46 +0100466static irqreturn_t ser_rx_int(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
468 struct async_struct * info;
469
470#ifdef SERIAL_DEBUG_INTR
471 printk("ser_rx_int...");
472#endif
473
474 info = IRQ_ports;
475 if (!info || !info->tty)
476 return IRQ_NONE;
477
478 receive_chars(info);
479 info->last_active = jiffies;
480#ifdef SERIAL_DEBUG_INTR
481 printk("end.\n");
482#endif
483 return IRQ_HANDLED;
484}
485
David Howells7d12e782006-10-05 14:55:46 +0100486static irqreturn_t ser_tx_int(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487{
488 struct async_struct * info;
489
490 if (custom.serdatr & SDR_TBE) {
491#ifdef SERIAL_DEBUG_INTR
492 printk("ser_tx_int...");
493#endif
494
495 info = IRQ_ports;
496 if (!info || !info->tty)
497 return IRQ_NONE;
498
499 transmit_chars(info);
500 info->last_active = jiffies;
501#ifdef SERIAL_DEBUG_INTR
502 printk("end.\n");
503#endif
504 }
505 return IRQ_HANDLED;
506}
507
508/*
509 * -------------------------------------------------------------------
510 * Here ends the serial interrupt routines.
511 * -------------------------------------------------------------------
512 */
513
514/*
515 * This routine is used to handle the "bottom half" processing for the
516 * serial driver, known also the "software interrupt" processing.
517 * This processing is done at the kernel interrupt level, after the
518 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
519 * is where time-consuming activities which can not be done in the
520 * interrupt driver proper are done; the interrupt driver schedules
521 * them using rs_sched_event(), and they get done here.
522 */
523
524static void do_softint(unsigned long private_)
525{
526 struct async_struct *info = (struct async_struct *) private_;
527 struct tty_struct *tty;
528
529 tty = info->tty;
530 if (!tty)
531 return;
532
Jiri Slabyb963a842007-02-10 01:44:55 -0800533 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 tty_wakeup(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535}
536
537/*
538 * ---------------------------------------------------------------
539 * Low level utility subroutines for the serial driver: routines to
540 * figure out the appropriate timeout for an interrupt chain, routines
541 * to initialize and startup a serial port, and routines to shutdown a
542 * serial port. Useful stuff like that.
543 * ---------------------------------------------------------------
544 */
545
546static int startup(struct async_struct * info)
547{
548 unsigned long flags;
549 int retval=0;
550 unsigned long page;
551
552 page = get_zeroed_page(GFP_KERNEL);
553 if (!page)
554 return -ENOMEM;
555
556 local_irq_save(flags);
557
558 if (info->flags & ASYNC_INITIALIZED) {
559 free_page(page);
560 goto errout;
561 }
562
563 if (info->xmit.buf)
564 free_page(page);
565 else
566 info->xmit.buf = (unsigned char *) page;
567
568#ifdef SERIAL_DEBUG_OPEN
569 printk("starting up ttys%d ...", info->line);
570#endif
571
572 /* Clear anything in the input buffer */
573
574 custom.intreq = IF_RBF;
575 mb();
576
577 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
578 if (retval) {
579 if (serial_isroot()) {
580 if (info->tty)
581 set_bit(TTY_IO_ERROR,
582 &info->tty->flags);
583 retval = 0;
584 }
585 goto errout;
586 }
587
588 /* enable both Rx and Tx interrupts */
589 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
590 mb();
591 info->IER = UART_IER_MSI;
592
593 /* remember current state of the DCD and CTS bits */
594 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
595
596 IRQ_ports = info;
597
598 info->MCR = 0;
599 if (info->tty->termios->c_cflag & CBAUD)
600 info->MCR = SER_DTR | SER_RTS;
601 rtsdtr_ctrl(info->MCR);
602
603 if (info->tty)
604 clear_bit(TTY_IO_ERROR, &info->tty->flags);
605 info->xmit.head = info->xmit.tail = 0;
606
607 /*
608 * Set up the tty->alt_speed kludge
609 */
610 if (info->tty) {
611 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
612 info->tty->alt_speed = 57600;
613 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
614 info->tty->alt_speed = 115200;
615 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
616 info->tty->alt_speed = 230400;
617 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
618 info->tty->alt_speed = 460800;
619 }
620
621 /*
622 * and set the speed of the serial port
623 */
624 change_speed(info, NULL);
625
626 info->flags |= ASYNC_INITIALIZED;
627 local_irq_restore(flags);
628 return 0;
629
630errout:
631 local_irq_restore(flags);
632 return retval;
633}
634
635/*
636 * This routine will shutdown a serial port; interrupts are disabled, and
637 * DTR is dropped if the hangup on close termio flag is on.
638 */
639static void shutdown(struct async_struct * info)
640{
641 unsigned long flags;
642 struct serial_state *state;
643
644 if (!(info->flags & ASYNC_INITIALIZED))
645 return;
646
647 state = info->state;
648
649#ifdef SERIAL_DEBUG_OPEN
650 printk("Shutting down serial port %d ....\n", info->line);
651#endif
652
653 local_irq_save(flags); /* Disable interrupts */
654
655 /*
656 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
657 * here so the queue might never be waken up
658 */
659 wake_up_interruptible(&info->delta_msr_wait);
660
661 IRQ_ports = NULL;
662
663 /*
664 * Free the IRQ, if necessary
665 */
666 free_irq(IRQ_AMIGA_VERTB, info);
667
668 if (info->xmit.buf) {
669 free_page((unsigned long) info->xmit.buf);
670 info->xmit.buf = NULL;
671 }
672
673 info->IER = 0;
674 custom.intena = IF_RBF | IF_TBE;
675 mb();
676
677 /* disable break condition */
678 custom.adkcon = AC_UARTBRK;
679 mb();
680
681 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
682 info->MCR &= ~(SER_DTR|SER_RTS);
683 rtsdtr_ctrl(info->MCR);
684
685 if (info->tty)
686 set_bit(TTY_IO_ERROR, &info->tty->flags);
687
688 info->flags &= ~ASYNC_INITIALIZED;
689 local_irq_restore(flags);
690}
691
692
693/*
694 * This routine is called to set the UART divisor registers to match
695 * the specified baud rate for a serial port.
696 */
697static void change_speed(struct async_struct *info,
Alan Cox606d0992006-12-08 02:38:45 -0800698 struct ktermios *old_termios)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699{
700 int quot = 0, baud_base, baud;
701 unsigned cflag, cval = 0;
702 int bits;
703 unsigned long flags;
704
705 if (!info->tty || !info->tty->termios)
706 return;
707 cflag = info->tty->termios->c_cflag;
708
709 /* Byte size is always 8 bits plus parity bit if requested */
710
711 cval = 3; bits = 10;
712 if (cflag & CSTOPB) {
713 cval |= 0x04;
714 bits++;
715 }
716 if (cflag & PARENB) {
717 cval |= UART_LCR_PARITY;
718 bits++;
719 }
720 if (!(cflag & PARODD))
721 cval |= UART_LCR_EPAR;
722#ifdef CMSPAR
723 if (cflag & CMSPAR)
724 cval |= UART_LCR_SPAR;
725#endif
726
727 /* Determine divisor based on baud rate */
728 baud = tty_get_baud_rate(info->tty);
729 if (!baud)
730 baud = 9600; /* B0 transition handled in rs_set_termios */
731 baud_base = info->state->baud_base;
732 if (baud == 38400 &&
733 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
734 quot = info->state->custom_divisor;
735 else {
736 if (baud == 134)
737 /* Special case since 134 is really 134.5 */
738 quot = (2*baud_base / 269);
739 else if (baud)
740 quot = baud_base / baud;
741 }
742 /* If the quotient is zero refuse the change */
743 if (!quot && old_termios) {
Alan Coxdb0ef082007-07-15 23:41:47 -0700744 /* FIXME: Will need updating for new tty in the end */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 info->tty->termios->c_cflag &= ~CBAUD;
746 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
747 baud = tty_get_baud_rate(info->tty);
748 if (!baud)
749 baud = 9600;
750 if (baud == 38400 &&
751 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
752 quot = info->state->custom_divisor;
753 else {
754 if (baud == 134)
755 /* Special case since 134 is really 134.5 */
756 quot = (2*baud_base / 269);
757 else if (baud)
758 quot = baud_base / baud;
759 }
760 }
761 /* As a last resort, if the quotient is zero, default to 9600 bps */
762 if (!quot)
763 quot = baud_base / 9600;
764 info->quot = quot;
765 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
766 info->timeout += HZ/50; /* Add .02 seconds of slop */
767
768 /* CTS flow control flag and modem status interrupts */
769 info->IER &= ~UART_IER_MSI;
770 if (info->flags & ASYNC_HARDPPS_CD)
771 info->IER |= UART_IER_MSI;
772 if (cflag & CRTSCTS) {
773 info->flags |= ASYNC_CTS_FLOW;
774 info->IER |= UART_IER_MSI;
775 } else
776 info->flags &= ~ASYNC_CTS_FLOW;
777 if (cflag & CLOCAL)
778 info->flags &= ~ASYNC_CHECK_CD;
779 else {
780 info->flags |= ASYNC_CHECK_CD;
781 info->IER |= UART_IER_MSI;
782 }
783 /* TBD:
Thadeu Lima de Souza Cascardo4b512d22009-04-14 23:14:10 -0300784 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 */
786
787 /*
788 * Set up parity check flag
789 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
791 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
792 if (I_INPCK(info->tty))
793 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
794 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
795 info->read_status_mask |= UART_LSR_BI;
796
797 /*
798 * Characters to ignore
799 */
800 info->ignore_status_mask = 0;
801 if (I_IGNPAR(info->tty))
802 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
803 if (I_IGNBRK(info->tty)) {
804 info->ignore_status_mask |= UART_LSR_BI;
805 /*
806 * If we're ignore parity and break indicators, ignore
807 * overruns too. (For real raw support).
808 */
809 if (I_IGNPAR(info->tty))
810 info->ignore_status_mask |= UART_LSR_OE;
811 }
812 /*
813 * !!! ignore all characters if CREAD is not set
814 */
815 if ((cflag & CREAD) == 0)
816 info->ignore_status_mask |= UART_LSR_DR;
817 local_irq_save(flags);
818
819 {
820 short serper;
821
822 /* Set up the baud rate */
823 serper = quot - 1;
824
825 /* Enable or disable parity bit */
826
827 if(cval & UART_LCR_PARITY)
828 serper |= (SERPER_PARENB);
829
830 custom.serper = serper;
831 mb();
832 }
833
834 info->LCR = cval; /* Save LCR */
835 local_irq_restore(flags);
836}
837
Alan Cox257afa32008-04-30 00:54:02 -0700838static int rs_put_char(struct tty_struct *tty, unsigned char ch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839{
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700840 struct async_struct *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 unsigned long flags;
842
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700843 info = tty->driver_data;
844
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
Alan Cox257afa32008-04-30 00:54:02 -0700846 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700848 if (!info->xmit.buf)
Alan Cox257afa32008-04-30 00:54:02 -0700849 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
851 local_irq_save(flags);
852 if (CIRC_SPACE(info->xmit.head,
853 info->xmit.tail,
854 SERIAL_XMIT_SIZE) == 0) {
855 local_irq_restore(flags);
Alan Cox257afa32008-04-30 00:54:02 -0700856 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 }
858
859 info->xmit.buf[info->xmit.head++] = ch;
860 info->xmit.head &= SERIAL_XMIT_SIZE-1;
861 local_irq_restore(flags);
Alan Cox257afa32008-04-30 00:54:02 -0700862 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863}
864
865static void rs_flush_chars(struct tty_struct *tty)
866{
Alan Coxc9f19e92009-01-02 13:47:26 +0000867 struct async_struct *info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 unsigned long flags;
869
870 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
871 return;
872
873 if (info->xmit.head == info->xmit.tail
874 || tty->stopped
875 || tty->hw_stopped
876 || !info->xmit.buf)
877 return;
878
879 local_irq_save(flags);
880 info->IER |= UART_IER_THRI;
881 custom.intena = IF_SETCLR | IF_TBE;
882 mb();
883 /* set a pending Tx Interrupt, transmitter should restart now */
884 custom.intreq = IF_SETCLR | IF_TBE;
885 mb();
886 local_irq_restore(flags);
887}
888
889static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
890{
891 int c, ret = 0;
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700892 struct async_struct *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 unsigned long flags;
894
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700895 info = tty->driver_data;
896
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 if (serial_paranoia_check(info, tty->name, "rs_write"))
898 return 0;
899
Jiri Slabyb3218a72006-10-04 02:15:27 -0700900 if (!info->xmit.buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 return 0;
902
Jiri Kosina3abf3be2007-02-10 01:46:48 -0800903 local_irq_save(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 while (1) {
905 c = CIRC_SPACE_TO_END(info->xmit.head,
906 info->xmit.tail,
907 SERIAL_XMIT_SIZE);
908 if (count < c)
909 c = count;
910 if (c <= 0) {
911 break;
912 }
913 memcpy(info->xmit.buf + info->xmit.head, buf, c);
914 info->xmit.head = ((info->xmit.head + c) &
915 (SERIAL_XMIT_SIZE-1));
916 buf += c;
917 count -= c;
918 ret += c;
919 }
920 local_irq_restore(flags);
921
922 if (info->xmit.head != info->xmit.tail
923 && !tty->stopped
924 && !tty->hw_stopped
925 && !(info->IER & UART_IER_THRI)) {
926 info->IER |= UART_IER_THRI;
927 local_irq_disable();
928 custom.intena = IF_SETCLR | IF_TBE;
929 mb();
930 /* set a pending Tx Interrupt, transmitter should restart now */
931 custom.intreq = IF_SETCLR | IF_TBE;
932 mb();
933 local_irq_restore(flags);
934 }
935 return ret;
936}
937
938static int rs_write_room(struct tty_struct *tty)
939{
Alan Coxc9f19e92009-01-02 13:47:26 +0000940 struct async_struct *info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
942 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
943 return 0;
944 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
945}
946
947static int rs_chars_in_buffer(struct tty_struct *tty)
948{
Alan Coxc9f19e92009-01-02 13:47:26 +0000949 struct async_struct *info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
952 return 0;
953 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
954}
955
956static void rs_flush_buffer(struct tty_struct *tty)
957{
Alan Coxc9f19e92009-01-02 13:47:26 +0000958 struct async_struct *info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 unsigned long flags;
960
961 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
962 return;
963 local_irq_save(flags);
964 info->xmit.head = info->xmit.tail = 0;
965 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 tty_wakeup(tty);
967}
968
969/*
970 * This function is used to send a high-priority XON/XOFF character to
971 * the device
972 */
973static void rs_send_xchar(struct tty_struct *tty, char ch)
974{
Alan Coxc9f19e92009-01-02 13:47:26 +0000975 struct async_struct *info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 unsigned long flags;
977
978 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
979 return;
980
981 info->x_char = ch;
982 if (ch) {
983 /* Make sure transmit interrupts are on */
984
985 /* Check this ! */
986 local_irq_save(flags);
987 if(!(custom.intenar & IF_TBE)) {
988 custom.intena = IF_SETCLR | IF_TBE;
989 mb();
990 /* set a pending Tx Interrupt, transmitter should restart now */
991 custom.intreq = IF_SETCLR | IF_TBE;
992 mb();
993 }
994 local_irq_restore(flags);
995
996 info->IER |= UART_IER_THRI;
997 }
998}
999
1000/*
1001 * ------------------------------------------------------------
1002 * rs_throttle()
1003 *
1004 * This routine is called by the upper-layer tty layer to signal that
1005 * incoming characters should be throttled.
1006 * ------------------------------------------------------------
1007 */
1008static void rs_throttle(struct tty_struct * tty)
1009{
Alan Coxc9f19e92009-01-02 13:47:26 +00001010 struct async_struct *info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 unsigned long flags;
1012#ifdef SERIAL_DEBUG_THROTTLE
1013 char buf[64];
1014
1015 printk("throttle %s: %d....\n", tty_name(tty, buf),
1016 tty->ldisc.chars_in_buffer(tty));
1017#endif
1018
1019 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1020 return;
1021
1022 if (I_IXOFF(tty))
1023 rs_send_xchar(tty, STOP_CHAR(tty));
1024
1025 if (tty->termios->c_cflag & CRTSCTS)
1026 info->MCR &= ~SER_RTS;
1027
1028 local_irq_save(flags);
1029 rtsdtr_ctrl(info->MCR);
1030 local_irq_restore(flags);
1031}
1032
1033static void rs_unthrottle(struct tty_struct * tty)
1034{
Alan Coxc9f19e92009-01-02 13:47:26 +00001035 struct async_struct *info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 unsigned long flags;
1037#ifdef SERIAL_DEBUG_THROTTLE
1038 char buf[64];
1039
1040 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1041 tty->ldisc.chars_in_buffer(tty));
1042#endif
1043
1044 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1045 return;
1046
1047 if (I_IXOFF(tty)) {
1048 if (info->x_char)
1049 info->x_char = 0;
1050 else
1051 rs_send_xchar(tty, START_CHAR(tty));
1052 }
1053 if (tty->termios->c_cflag & CRTSCTS)
1054 info->MCR |= SER_RTS;
1055 local_irq_save(flags);
1056 rtsdtr_ctrl(info->MCR);
1057 local_irq_restore(flags);
1058}
1059
1060/*
1061 * ------------------------------------------------------------
1062 * rs_ioctl() and friends
1063 * ------------------------------------------------------------
1064 */
1065
1066static int get_serial_info(struct async_struct * info,
Al Viroab14cae2006-01-12 01:06:30 -08001067 struct serial_struct __user * retinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068{
1069 struct serial_struct tmp;
1070 struct serial_state *state = info->state;
1071
1072 if (!retinfo)
1073 return -EFAULT;
1074 memset(&tmp, 0, sizeof(tmp));
Arnd Bergmannec79d602010-06-01 22:53:01 +02001075 tty_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 tmp.type = state->type;
1077 tmp.line = state->line;
1078 tmp.port = state->port;
1079 tmp.irq = state->irq;
1080 tmp.flags = state->flags;
1081 tmp.xmit_fifo_size = state->xmit_fifo_size;
1082 tmp.baud_base = state->baud_base;
1083 tmp.close_delay = state->close_delay;
1084 tmp.closing_wait = state->closing_wait;
1085 tmp.custom_divisor = state->custom_divisor;
Arnd Bergmannec79d602010-06-01 22:53:01 +02001086 tty_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1088 return -EFAULT;
1089 return 0;
1090}
1091
1092static int set_serial_info(struct async_struct * info,
Al Viroab14cae2006-01-12 01:06:30 -08001093 struct serial_struct __user * new_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094{
1095 struct serial_struct new_serial;
1096 struct serial_state old_state, *state;
1097 unsigned int change_irq,change_port;
1098 int retval = 0;
1099
1100 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1101 return -EFAULT;
Alan Coxe18ce492008-04-30 00:53:16 -07001102
Arnd Bergmannec79d602010-06-01 22:53:01 +02001103 tty_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 state = info->state;
1105 old_state = *state;
1106
1107 change_irq = new_serial.irq != state->irq;
1108 change_port = (new_serial.port != state->port);
Alan Coxe18ce492008-04-30 00:53:16 -07001109 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
Arnd Bergmannec79d602010-06-01 22:53:01 +02001110 tty_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 return -EINVAL;
Alan Coxe18ce492008-04-30 00:53:16 -07001112 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113
1114 if (!serial_isroot()) {
1115 if ((new_serial.baud_base != state->baud_base) ||
1116 (new_serial.close_delay != state->close_delay) ||
1117 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1118 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1119 (state->flags & ~ASYNC_USR_MASK)))
1120 return -EPERM;
1121 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1122 (new_serial.flags & ASYNC_USR_MASK));
1123 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1124 (new_serial.flags & ASYNC_USR_MASK));
1125 state->custom_divisor = new_serial.custom_divisor;
1126 goto check_and_exit;
1127 }
1128
Alan Coxe18ce492008-04-30 00:53:16 -07001129 if (new_serial.baud_base < 9600) {
Arnd Bergmannec79d602010-06-01 22:53:01 +02001130 tty_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 return -EINVAL;
Alan Coxe18ce492008-04-30 00:53:16 -07001132 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
1134 /*
1135 * OK, past this point, all the error checking has been done.
1136 * At this point, we start making changes.....
1137 */
1138
1139 state->baud_base = new_serial.baud_base;
1140 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1141 (new_serial.flags & ASYNC_FLAGS));
1142 info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1143 (info->flags & ASYNC_INTERNAL_FLAGS));
1144 state->custom_divisor = new_serial.custom_divisor;
1145 state->close_delay = new_serial.close_delay * HZ/100;
1146 state->closing_wait = new_serial.closing_wait * HZ/100;
1147 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1148
1149check_and_exit:
1150 if (info->flags & ASYNC_INITIALIZED) {
1151 if (((old_state.flags & ASYNC_SPD_MASK) !=
1152 (state->flags & ASYNC_SPD_MASK)) ||
1153 (old_state.custom_divisor != state->custom_divisor)) {
1154 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1155 info->tty->alt_speed = 57600;
1156 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1157 info->tty->alt_speed = 115200;
1158 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1159 info->tty->alt_speed = 230400;
1160 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1161 info->tty->alt_speed = 460800;
1162 change_speed(info, NULL);
1163 }
1164 } else
1165 retval = startup(info);
Arnd Bergmannec79d602010-06-01 22:53:01 +02001166 tty_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 return retval;
1168}
1169
1170
1171/*
1172 * get_lsr_info - get line status register info
1173 *
1174 * Purpose: Let user call ioctl() to get info when the UART physically
1175 * is emptied. On bus types like RS485, the transmitter must
1176 * release the bus after transmitting. This must be done when
1177 * the transmit shift register is empty, not be done when the
1178 * transmit holding register is empty. This functionality
1179 * allows an RS485 driver to be written in user space.
1180 */
Al Viroab14cae2006-01-12 01:06:30 -08001181static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182{
1183 unsigned char status;
1184 unsigned int result;
1185 unsigned long flags;
1186
1187 local_irq_save(flags);
1188 status = custom.serdatr;
1189 mb();
1190 local_irq_restore(flags);
1191 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1192 if (copy_to_user(value, &result, sizeof(int)))
1193 return -EFAULT;
1194 return 0;
1195}
1196
1197
1198static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1199{
Alan Coxc9f19e92009-01-02 13:47:26 +00001200 struct async_struct * info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 unsigned char control, status;
1202 unsigned long flags;
1203
1204 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1205 return -ENODEV;
1206 if (tty->flags & (1 << TTY_IO_ERROR))
1207 return -EIO;
1208
1209 control = info->MCR;
1210 local_irq_save(flags);
1211 status = ciab.pra;
1212 local_irq_restore(flags);
1213 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1214 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1215 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1216 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1217 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1218}
1219
1220static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1221 unsigned int set, unsigned int clear)
1222{
Alan Coxc9f19e92009-01-02 13:47:26 +00001223 struct async_struct * info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 unsigned long flags;
1225
1226 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1227 return -ENODEV;
1228 if (tty->flags & (1 << TTY_IO_ERROR))
1229 return -EIO;
1230
1231 local_irq_save(flags);
1232 if (set & TIOCM_RTS)
1233 info->MCR |= SER_RTS;
1234 if (set & TIOCM_DTR)
1235 info->MCR |= SER_DTR;
1236 if (clear & TIOCM_RTS)
1237 info->MCR &= ~SER_RTS;
1238 if (clear & TIOCM_DTR)
1239 info->MCR &= ~SER_DTR;
1240 rtsdtr_ctrl(info->MCR);
1241 local_irq_restore(flags);
1242 return 0;
1243}
1244
1245/*
1246 * rs_break() --- routine which turns the break handling on or off
1247 */
Alan Cox9e989662008-07-22 11:18:03 +01001248static int rs_break(struct tty_struct *tty, int break_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249{
Alan Coxc9f19e92009-01-02 13:47:26 +00001250 struct async_struct * info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 unsigned long flags;
1252
1253 if (serial_paranoia_check(info, tty->name, "rs_break"))
Geert Uytterhoeven970a8a52008-08-06 22:19:39 +02001254 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255
1256 local_irq_save(flags);
1257 if (break_state == -1)
1258 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1259 else
1260 custom.adkcon = AC_UARTBRK;
1261 mb();
1262 local_irq_restore(flags);
Alan Cox9e989662008-07-22 11:18:03 +01001263 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264}
1265
Alan Cox05871022010-09-16 18:21:52 +01001266/*
1267 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1268 * Return: write counters to the user passed counter struct
1269 * NB: both 1->0 and 0->1 transitions are counted except for
1270 * RI where only 0->1 is counted.
1271 */
1272static int rs_get_icount(struct tty_struct *tty,
1273 struct serial_icounter_struct *icount)
1274{
1275 struct async_struct *info = tty->driver_data;
1276 struct async_icount cnow;
1277 unsigned long flags;
1278
1279 local_irq_save(flags);
1280 cnow = info->state->icount;
1281 local_irq_restore(flags);
1282 icount->cts = cnow.cts;
1283 icount->dsr = cnow.dsr;
1284 icount->rng = cnow.rng;
1285 icount->dcd = cnow.dcd;
1286 icount->rx = cnow.rx;
1287 icount->tx = cnow.tx;
1288 icount->frame = cnow.frame;
1289 icount->overrun = cnow.overrun;
1290 icount->parity = cnow.parity;
1291 icount->brk = cnow.brk;
1292 icount->buf_overrun = cnow.buf_overrun;
1293
1294 return 0;
1295}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
1297static int rs_ioctl(struct tty_struct *tty, struct file * file,
1298 unsigned int cmd, unsigned long arg)
1299{
Alan Coxc9f19e92009-01-02 13:47:26 +00001300 struct async_struct * info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 struct async_icount cprev, cnow; /* kernel counter temps */
1302 struct serial_icounter_struct icount;
Al Viroab14cae2006-01-12 01:06:30 -08001303 void __user *argp = (void __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 unsigned long flags;
1305
1306 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1307 return -ENODEV;
1308
1309 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1310 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1311 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1312 if (tty->flags & (1 << TTY_IO_ERROR))
1313 return -EIO;
1314 }
1315
1316 switch (cmd) {
1317 case TIOCGSERIAL:
Al Viroab14cae2006-01-12 01:06:30 -08001318 return get_serial_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 case TIOCSSERIAL:
Al Viroab14cae2006-01-12 01:06:30 -08001320 return set_serial_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 case TIOCSERCONFIG:
1322 return 0;
1323
1324 case TIOCSERGETLSR: /* Get line status register */
Al Viroab14cae2006-01-12 01:06:30 -08001325 return get_lsr_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
1327 case TIOCSERGSTRUCT:
Al Viroab14cae2006-01-12 01:06:30 -08001328 if (copy_to_user(argp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 info, sizeof(struct async_struct)))
1330 return -EFAULT;
1331 return 0;
1332
1333 /*
1334 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1335 * - mask passed in arg for lines of interest
1336 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1337 * Caller should use TIOCGICOUNT to see which one it was
1338 */
1339 case TIOCMIWAIT:
1340 local_irq_save(flags);
1341 /* note the counters on entry */
1342 cprev = info->state->icount;
1343 local_irq_restore(flags);
1344 while (1) {
1345 interruptible_sleep_on(&info->delta_msr_wait);
1346 /* see if a signal did it */
1347 if (signal_pending(current))
1348 return -ERESTARTSYS;
1349 local_irq_save(flags);
1350 cnow = info->state->icount; /* atomic copy */
1351 local_irq_restore(flags);
1352 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1353 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1354 return -EIO; /* no change => error */
1355 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1356 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1357 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1358 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1359 return 0;
1360 }
1361 cprev = cnow;
1362 }
1363 /* NOTREACHED */
1364
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 case TIOCSERGWILD:
1366 case TIOCSERSWILD:
1367 /* "setserial -W" is called in Debian boot */
1368 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1369 return 0;
1370
1371 default:
1372 return -ENOIOCTLCMD;
1373 }
1374 return 0;
1375}
1376
Alan Cox606d0992006-12-08 02:38:45 -08001377static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378{
Alan Coxc9f19e92009-01-02 13:47:26 +00001379 struct async_struct *info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 unsigned long flags;
1381 unsigned int cflag = tty->termios->c_cflag;
1382
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 change_speed(info, old_termios);
1384
1385 /* Handle transition to B0 status */
1386 if ((old_termios->c_cflag & CBAUD) &&
1387 !(cflag & CBAUD)) {
1388 info->MCR &= ~(SER_DTR|SER_RTS);
1389 local_irq_save(flags);
1390 rtsdtr_ctrl(info->MCR);
1391 local_irq_restore(flags);
1392 }
1393
1394 /* Handle transition away from B0 status */
1395 if (!(old_termios->c_cflag & CBAUD) &&
1396 (cflag & CBAUD)) {
1397 info->MCR |= SER_DTR;
1398 if (!(tty->termios->c_cflag & CRTSCTS) ||
1399 !test_bit(TTY_THROTTLED, &tty->flags)) {
1400 info->MCR |= SER_RTS;
1401 }
1402 local_irq_save(flags);
1403 rtsdtr_ctrl(info->MCR);
1404 local_irq_restore(flags);
1405 }
1406
1407 /* Handle turning off CRTSCTS */
1408 if ((old_termios->c_cflag & CRTSCTS) &&
1409 !(tty->termios->c_cflag & CRTSCTS)) {
1410 tty->hw_stopped = 0;
1411 rs_start(tty);
1412 }
1413
1414#if 0
1415 /*
1416 * No need to wake up processes in open wait, since they
1417 * sample the CLOCAL flag once, and don't recheck it.
1418 * XXX It's not clear whether the current behavior is correct
1419 * or not. Hence, this may change.....
1420 */
1421 if (!(old_termios->c_cflag & CLOCAL) &&
1422 (tty->termios->c_cflag & CLOCAL))
1423 wake_up_interruptible(&info->open_wait);
1424#endif
1425}
1426
1427/*
1428 * ------------------------------------------------------------
1429 * rs_close()
1430 *
1431 * This routine is called when the serial port gets closed. First, we
1432 * wait for the last remaining data to be sent. Then, we unlink its
1433 * async structure from the interrupt chain if necessary, and we free
1434 * that IRQ if nothing is left in the chain.
1435 * ------------------------------------------------------------
1436 */
1437static void rs_close(struct tty_struct *tty, struct file * filp)
1438{
Alan Coxc9f19e92009-01-02 13:47:26 +00001439 struct async_struct * info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 struct serial_state *state;
1441 unsigned long flags;
1442
1443 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1444 return;
1445
1446 state = info->state;
1447
1448 local_irq_save(flags);
1449
1450 if (tty_hung_up_p(filp)) {
1451 DBG_CNT("before DEC-hung");
1452 local_irq_restore(flags);
1453 return;
1454 }
1455
1456#ifdef SERIAL_DEBUG_OPEN
1457 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1458#endif
1459 if ((tty->count == 1) && (state->count != 1)) {
1460 /*
1461 * Uh, oh. tty->count is 1, which means that the tty
1462 * structure will be freed. state->count should always
1463 * be one in these conditions. If it's greater than
1464 * one, we've got real problems, since it means the
1465 * serial port won't be shutdown.
1466 */
1467 printk("rs_close: bad serial port count; tty->count is 1, "
1468 "state->count is %d\n", state->count);
1469 state->count = 1;
1470 }
1471 if (--state->count < 0) {
1472 printk("rs_close: bad serial port count for ttys%d: %d\n",
1473 info->line, state->count);
1474 state->count = 0;
1475 }
1476 if (state->count) {
1477 DBG_CNT("before DEC-2");
1478 local_irq_restore(flags);
1479 return;
1480 }
1481 info->flags |= ASYNC_CLOSING;
1482 /*
1483 * Now we wait for the transmit buffer to clear; and we notify
1484 * the line discipline to only process XON/XOFF characters.
1485 */
1486 tty->closing = 1;
1487 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1488 tty_wait_until_sent(tty, info->closing_wait);
1489 /*
1490 * At this point we stop accepting input. To do this, we
1491 * disable the receive line status interrupts, and tell the
1492 * interrupt driver to stop checking the data ready bit in the
1493 * line status register.
1494 */
1495 info->read_status_mask &= ~UART_LSR_DR;
1496 if (info->flags & ASYNC_INITIALIZED) {
1497 /* disable receive interrupts */
1498 custom.intena = IF_RBF;
1499 mb();
1500 /* clear any pending receive interrupt */
1501 custom.intreq = IF_RBF;
1502 mb();
1503
1504 /*
1505 * Before we drop DTR, make sure the UART transmitter
1506 * has completely drained; this is especially
1507 * important if there is a transmit FIFO!
1508 */
1509 rs_wait_until_sent(tty, info->timeout);
1510 }
1511 shutdown(info);
Alan Cox978e5952008-04-30 00:53:59 -07001512 rs_flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513
1514 tty_ldisc_flush(tty);
1515 tty->closing = 0;
1516 info->event = 0;
1517 info->tty = NULL;
1518 if (info->blocked_open) {
1519 if (info->close_delay) {
1520 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1521 }
1522 wake_up_interruptible(&info->open_wait);
1523 }
1524 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1525 wake_up_interruptible(&info->close_wait);
1526 local_irq_restore(flags);
1527}
1528
1529/*
1530 * rs_wait_until_sent() --- wait until the transmitter is empty
1531 */
1532static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1533{
Alan Coxc9f19e92009-01-02 13:47:26 +00001534 struct async_struct * info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 unsigned long orig_jiffies, char_time;
Arnd Bergmann20365212010-06-01 22:53:07 +02001536 int tty_was_locked = tty_locked();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 int lsr;
1538
1539 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1540 return;
1541
1542 if (info->xmit_fifo_size == 0)
1543 return; /* Just in case.... */
1544
1545 orig_jiffies = jiffies;
Alan Cox978e5952008-04-30 00:53:59 -07001546
Arnd Bergmann20365212010-06-01 22:53:07 +02001547 /*
1548 * tty_wait_until_sent is called from lots of places,
1549 * with or without the BTM.
1550 */
1551 if (!tty_was_locked)
1552 tty_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 /*
1554 * Set the check interval to be 1/5 of the estimated time to
1555 * send a single character, and make it at least 1. The check
1556 * interval should also be less than the timeout.
1557 *
1558 * Note: we have to use pretty tight timings here to satisfy
1559 * the NIST-PCTS.
1560 */
1561 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1562 char_time = char_time / 5;
1563 if (char_time == 0)
1564 char_time = 1;
1565 if (timeout)
1566 char_time = min_t(unsigned long, char_time, timeout);
1567 /*
1568 * If the transmitter hasn't cleared in twice the approximate
1569 * amount of time to send the entire FIFO, it probably won't
1570 * ever clear. This assumes the UART isn't doing flow
1571 * control, which is currently the case. Hence, if it ever
1572 * takes longer than info->timeout, this is probably due to a
1573 * UART bug of some kind. So, we clamp the timeout parameter at
1574 * 2*info->timeout.
1575 */
1576 if (!timeout || timeout > 2*info->timeout)
1577 timeout = 2*info->timeout;
1578#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1579 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1580 printk("jiff=%lu...", jiffies);
1581#endif
1582 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1583#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1584 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1585#endif
1586 msleep_interruptible(jiffies_to_msecs(char_time));
1587 if (signal_pending(current))
1588 break;
1589 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1590 break;
1591 }
Milind Arun Choudharycc0a8fb2007-05-08 00:30:52 -07001592 __set_current_state(TASK_RUNNING);
Arnd Bergmann20365212010-06-01 22:53:07 +02001593 if (!tty_was_locked)
1594 tty_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1596 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1597#endif
1598}
1599
1600/*
1601 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1602 */
1603static void rs_hangup(struct tty_struct *tty)
1604{
Alan Coxc9f19e92009-01-02 13:47:26 +00001605 struct async_struct * info = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 struct serial_state *state = info->state;
1607
1608 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1609 return;
1610
1611 state = info->state;
1612
1613 rs_flush_buffer(tty);
1614 shutdown(info);
1615 info->event = 0;
1616 state->count = 0;
1617 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1618 info->tty = NULL;
1619 wake_up_interruptible(&info->open_wait);
1620}
1621
1622/*
1623 * ------------------------------------------------------------
1624 * rs_open() and friends
1625 * ------------------------------------------------------------
1626 */
1627static int block_til_ready(struct tty_struct *tty, struct file * filp,
1628 struct async_struct *info)
1629{
1630#ifdef DECLARE_WAITQUEUE
1631 DECLARE_WAITQUEUE(wait, current);
1632#else
1633 struct wait_queue wait = { current, NULL };
1634#endif
1635 struct serial_state *state = info->state;
1636 int retval;
1637 int do_clocal = 0, extra_count = 0;
1638 unsigned long flags;
1639
1640 /*
1641 * If the device is in the middle of being closed, then block
1642 * until it's done, and then try again.
1643 */
1644 if (tty_hung_up_p(filp) ||
1645 (info->flags & ASYNC_CLOSING)) {
1646 if (info->flags & ASYNC_CLOSING)
1647 interruptible_sleep_on(&info->close_wait);
1648#ifdef SERIAL_DO_RESTART
1649 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1650 -EAGAIN : -ERESTARTSYS);
1651#else
1652 return -EAGAIN;
1653#endif
1654 }
1655
1656 /*
1657 * If non-blocking mode is set, or the port is not enabled,
1658 * then make the check up front and then exit.
1659 */
1660 if ((filp->f_flags & O_NONBLOCK) ||
1661 (tty->flags & (1 << TTY_IO_ERROR))) {
1662 info->flags |= ASYNC_NORMAL_ACTIVE;
1663 return 0;
1664 }
1665
1666 if (tty->termios->c_cflag & CLOCAL)
1667 do_clocal = 1;
1668
1669 /*
1670 * Block waiting for the carrier detect and the line to become
1671 * free (i.e., not in use by the callout). While we are in
1672 * this loop, state->count is dropped by one, so that
1673 * rs_close() knows when to free things. We restore it upon
1674 * exit, either normal or abnormal.
1675 */
1676 retval = 0;
1677 add_wait_queue(&info->open_wait, &wait);
1678#ifdef SERIAL_DEBUG_OPEN
1679 printk("block_til_ready before block: ttys%d, count = %d\n",
1680 state->line, state->count);
1681#endif
1682 local_irq_save(flags);
1683 if (!tty_hung_up_p(filp)) {
1684 extra_count = 1;
1685 state->count--;
1686 }
1687 local_irq_restore(flags);
1688 info->blocked_open++;
1689 while (1) {
1690 local_irq_save(flags);
1691 if (tty->termios->c_cflag & CBAUD)
1692 rtsdtr_ctrl(SER_DTR|SER_RTS);
1693 local_irq_restore(flags);
1694 set_current_state(TASK_INTERRUPTIBLE);
1695 if (tty_hung_up_p(filp) ||
1696 !(info->flags & ASYNC_INITIALIZED)) {
1697#ifdef SERIAL_DO_RESTART
1698 if (info->flags & ASYNC_HUP_NOTIFY)
1699 retval = -EAGAIN;
1700 else
1701 retval = -ERESTARTSYS;
1702#else
1703 retval = -EAGAIN;
1704#endif
1705 break;
1706 }
1707 if (!(info->flags & ASYNC_CLOSING) &&
1708 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1709 break;
1710 if (signal_pending(current)) {
1711 retval = -ERESTARTSYS;
1712 break;
1713 }
1714#ifdef SERIAL_DEBUG_OPEN
1715 printk("block_til_ready blocking: ttys%d, count = %d\n",
1716 info->line, state->count);
1717#endif
Arnd Bergmanne142a312010-06-01 22:53:10 +02001718 tty_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 schedule();
Arnd Bergmanne142a312010-06-01 22:53:10 +02001720 tty_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 }
Milind Arun Choudharycc0a8fb2007-05-08 00:30:52 -07001722 __set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 remove_wait_queue(&info->open_wait, &wait);
1724 if (extra_count)
1725 state->count++;
1726 info->blocked_open--;
1727#ifdef SERIAL_DEBUG_OPEN
1728 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1729 info->line, state->count);
1730#endif
1731 if (retval)
1732 return retval;
1733 info->flags |= ASYNC_NORMAL_ACTIVE;
1734 return 0;
1735}
1736
1737static int get_async_struct(int line, struct async_struct **ret_info)
1738{
1739 struct async_struct *info;
1740 struct serial_state *sstate;
1741
1742 sstate = rs_table + line;
1743 sstate->count++;
1744 if (sstate->info) {
1745 *ret_info = sstate->info;
1746 return 0;
1747 }
Yoann Padioleaudd00cc42007-07-19 01:49:03 -07001748 info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 if (!info) {
1750 sstate->count--;
1751 return -ENOMEM;
1752 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753#ifdef DECLARE_WAITQUEUE
1754 init_waitqueue_head(&info->open_wait);
1755 init_waitqueue_head(&info->close_wait);
1756 init_waitqueue_head(&info->delta_msr_wait);
1757#endif
1758 info->magic = SERIAL_MAGIC;
1759 info->port = sstate->port;
1760 info->flags = sstate->flags;
1761 info->xmit_fifo_size = sstate->xmit_fifo_size;
1762 info->line = line;
1763 tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1764 info->state = sstate;
1765 if (sstate->info) {
1766 kfree(info);
1767 *ret_info = sstate->info;
1768 return 0;
1769 }
1770 *ret_info = sstate->info = info;
1771 return 0;
1772}
1773
1774/*
1775 * This routine is called whenever a serial port is opened. It
1776 * enables interrupts for a serial port, linking in its async structure into
1777 * the IRQ chain. It also performs the serial-specific
1778 * initialization for the tty structure.
1779 */
1780static int rs_open(struct tty_struct *tty, struct file * filp)
1781{
1782 struct async_struct *info;
1783 int retval, line;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784
1785 line = tty->index;
1786 if ((line < 0) || (line >= NR_PORTS)) {
1787 return -ENODEV;
1788 }
1789 retval = get_async_struct(line, &info);
1790 if (retval) {
1791 return retval;
1792 }
1793 tty->driver_data = info;
1794 info->tty = tty;
1795 if (serial_paranoia_check(info, tty->name, "rs_open"))
1796 return -ENODEV;
1797
1798#ifdef SERIAL_DEBUG_OPEN
1799 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1800#endif
1801 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1802
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 /*
1804 * If the port is the middle of closing, bail out now
1805 */
1806 if (tty_hung_up_p(filp) ||
1807 (info->flags & ASYNC_CLOSING)) {
1808 if (info->flags & ASYNC_CLOSING)
1809 interruptible_sleep_on(&info->close_wait);
1810#ifdef SERIAL_DO_RESTART
1811 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1812 -EAGAIN : -ERESTARTSYS);
1813#else
1814 return -EAGAIN;
1815#endif
1816 }
1817
1818 /*
1819 * Start up serial port
1820 */
1821 retval = startup(info);
1822 if (retval) {
1823 return retval;
1824 }
1825
1826 retval = block_til_ready(tty, filp, info);
1827 if (retval) {
1828#ifdef SERIAL_DEBUG_OPEN
1829 printk("rs_open returning after block_til_ready with %d\n",
1830 retval);
1831#endif
1832 return retval;
1833 }
1834
1835#ifdef SERIAL_DEBUG_OPEN
1836 printk("rs_open %s successful...", tty->name);
1837#endif
1838 return 0;
1839}
1840
1841/*
1842 * /proc fs routines....
1843 */
1844
Alexey Dobriyand5940272009-03-31 15:19:23 -07001845static inline void line_info(struct seq_file *m, struct serial_state *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846{
1847 struct async_struct *info = state->info, scr_info;
1848 char stat_buf[30], control, status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849 unsigned long flags;
1850
Alexey Dobriyand5940272009-03-31 15:19:23 -07001851 seq_printf(m, "%d: uart:amiga_builtin",state->line);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852
1853 /*
1854 * Figure out the current RS-232 lines
1855 */
1856 if (!info) {
1857 info = &scr_info; /* This is just for serial_{in,out} */
1858
1859 info->magic = SERIAL_MAGIC;
1860 info->flags = state->flags;
1861 info->quot = 0;
1862 info->tty = NULL;
1863 }
1864 local_irq_save(flags);
1865 status = ciab.pra;
1866 control = info ? info->MCR : status;
1867 local_irq_restore(flags);
1868
1869 stat_buf[0] = 0;
1870 stat_buf[1] = 0;
1871 if(!(control & SER_RTS))
1872 strcat(stat_buf, "|RTS");
1873 if(!(status & SER_CTS))
1874 strcat(stat_buf, "|CTS");
1875 if(!(control & SER_DTR))
1876 strcat(stat_buf, "|DTR");
1877 if(!(status & SER_DSR))
1878 strcat(stat_buf, "|DSR");
1879 if(!(status & SER_DCD))
1880 strcat(stat_buf, "|CD");
1881
1882 if (info->quot) {
Alexey Dobriyand5940272009-03-31 15:19:23 -07001883 seq_printf(m, " baud:%d", state->baud_base / info->quot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 }
1885
Alexey Dobriyand5940272009-03-31 15:19:23 -07001886 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887
1888 if (state->icount.frame)
Alexey Dobriyand5940272009-03-31 15:19:23 -07001889 seq_printf(m, " fe:%d", state->icount.frame);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890
1891 if (state->icount.parity)
Alexey Dobriyand5940272009-03-31 15:19:23 -07001892 seq_printf(m, " pe:%d", state->icount.parity);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893
1894 if (state->icount.brk)
Alexey Dobriyand5940272009-03-31 15:19:23 -07001895 seq_printf(m, " brk:%d", state->icount.brk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896
1897 if (state->icount.overrun)
Alexey Dobriyand5940272009-03-31 15:19:23 -07001898 seq_printf(m, " oe:%d", state->icount.overrun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899
1900 /*
1901 * Last thing is the RS-232 status lines
1902 */
Alexey Dobriyand5940272009-03-31 15:19:23 -07001903 seq_printf(m, " %s\n", stat_buf+1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904}
1905
Alexey Dobriyand5940272009-03-31 15:19:23 -07001906static int rs_proc_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907{
Alexey Dobriyand5940272009-03-31 15:19:23 -07001908 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1909 line_info(m, &rs_table[0]);
1910 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911}
1912
Alexey Dobriyand5940272009-03-31 15:19:23 -07001913static int rs_proc_open(struct inode *inode, struct file *file)
1914{
1915 return single_open(file, rs_proc_show, NULL);
1916}
1917
1918static const struct file_operations rs_proc_fops = {
1919 .owner = THIS_MODULE,
1920 .open = rs_proc_open,
1921 .read = seq_read,
1922 .llseek = seq_lseek,
1923 .release = single_release,
1924};
1925
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926/*
1927 * ---------------------------------------------------------------------
1928 * rs_init() and friends
1929 *
1930 * rs_init() is called at boot-time to initialize the serial driver.
1931 * ---------------------------------------------------------------------
1932 */
1933
1934/*
1935 * This routine prints out the appropriate serial driver version
1936 * number, and identifies which options were configured into this
1937 * driver.
1938 */
Adrian Bunk41c28ff2006-03-23 03:00:56 -08001939static void show_serial_version(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940{
1941 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1942}
1943
1944
Jeff Dikeb68e31d2006-10-02 02:17:18 -07001945static const struct tty_operations serial_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 .open = rs_open,
1947 .close = rs_close,
1948 .write = rs_write,
1949 .put_char = rs_put_char,
1950 .flush_chars = rs_flush_chars,
1951 .write_room = rs_write_room,
1952 .chars_in_buffer = rs_chars_in_buffer,
1953 .flush_buffer = rs_flush_buffer,
1954 .ioctl = rs_ioctl,
1955 .throttle = rs_throttle,
1956 .unthrottle = rs_unthrottle,
1957 .set_termios = rs_set_termios,
1958 .stop = rs_stop,
1959 .start = rs_start,
1960 .hangup = rs_hangup,
1961 .break_ctl = rs_break,
1962 .send_xchar = rs_send_xchar,
1963 .wait_until_sent = rs_wait_until_sent,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964 .tiocmget = rs_tiocmget,
1965 .tiocmset = rs_tiocmset,
Alan Cox05871022010-09-16 18:21:52 +01001966 .get_icount = rs_get_icount,
Alexey Dobriyand5940272009-03-31 15:19:23 -07001967 .proc_fops = &rs_proc_fops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968};
1969
1970/*
1971 * The serial driver boot-time initialization code!
1972 */
Geert Uytterhoeven826e8c82009-04-05 13:12:30 +02001973static int __init amiga_serial_probe(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974{
1975 unsigned long flags;
1976 struct serial_state * state;
Geert Uytterhoeven5edc3042008-12-30 14:13:41 +01001977 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 serial_driver = alloc_tty_driver(1);
1980 if (!serial_driver)
1981 return -ENOMEM;
1982
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 IRQ_ports = NULL;
1984
1985 show_serial_version();
1986
1987 /* Initialize the tty_driver structure */
1988
1989 serial_driver->owner = THIS_MODULE;
1990 serial_driver->driver_name = "amiserial";
1991 serial_driver->name = "ttyS";
1992 serial_driver->major = TTY_MAJOR;
1993 serial_driver->minor_start = 64;
1994 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1995 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1996 serial_driver->init_termios = tty_std_termios;
1997 serial_driver->init_termios.c_cflag =
1998 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1999 serial_driver->flags = TTY_DRIVER_REAL_RAW;
2000 tty_set_operations(serial_driver, &serial_ops);
2001
Geert Uytterhoeven5edc3042008-12-30 14:13:41 +01002002 error = tty_register_driver(serial_driver);
2003 if (error)
Geert Uytterhoeven826e8c82009-04-05 13:12:30 +02002004 goto fail_put_tty_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005
2006 state = rs_table;
2007 state->magic = SSTATE_MAGIC;
2008 state->port = (int)&custom.serdatr; /* Just to give it a value */
2009 state->line = 0;
2010 state->custom_divisor = 0;
2011 state->close_delay = 5*HZ/10;
2012 state->closing_wait = 30*HZ;
2013 state->icount.cts = state->icount.dsr =
2014 state->icount.rng = state->icount.dcd = 0;
2015 state->icount.rx = state->icount.tx = 0;
2016 state->icount.frame = state->icount.parity = 0;
2017 state->icount.overrun = state->icount.brk = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002018
2019 printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2020 state->line);
2021
2022 /* Hardware set up */
2023
2024 state->baud_base = amiga_colorclock;
2025 state->xmit_fifo_size = 1;
2026
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027 /* set ISRs, and then disable the rx interrupts */
Geert Uytterhoeven5edc3042008-12-30 14:13:41 +01002028 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2029 if (error)
2030 goto fail_unregister;
2031
2032 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED,
2033 "serial RX", state);
2034 if (error)
2035 goto fail_free_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036
Julia Lawallc70c0362010-04-06 14:34:46 -07002037 local_irq_save(flags);
2038
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039 /* turn off Rx and Tx interrupts */
2040 custom.intena = IF_RBF | IF_TBE;
2041 mb();
2042
2043 /* clear any pending interrupt */
2044 custom.intreq = IF_RBF | IF_TBE;
2045 mb();
2046
2047 local_irq_restore(flags);
2048
2049 /*
2050 * set the appropriate directions for the modem control flags,
2051 * and clear RTS and DTR
2052 */
2053 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2054 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2055
Geert Uytterhoeven826e8c82009-04-05 13:12:30 +02002056 platform_set_drvdata(pdev, state);
2057
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058 return 0;
Geert Uytterhoeven5edc3042008-12-30 14:13:41 +01002059
2060fail_free_irq:
2061 free_irq(IRQ_AMIGA_TBE, state);
2062fail_unregister:
2063 tty_unregister_driver(serial_driver);
Geert Uytterhoeven5edc3042008-12-30 14:13:41 +01002064fail_put_tty_driver:
2065 put_tty_driver(serial_driver);
2066 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067}
2068
Geert Uytterhoeven826e8c82009-04-05 13:12:30 +02002069static int __exit amiga_serial_remove(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070{
2071 int error;
Geert Uytterhoeven826e8c82009-04-05 13:12:30 +02002072 struct serial_state *state = platform_get_drvdata(pdev);
2073 struct async_struct *info = state->info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074
2075 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2076 tasklet_kill(&info->tlet);
2077 if ((error = tty_unregister_driver(serial_driver)))
2078 printk("SERIAL: failed to unregister serial driver (%d)\n",
2079 error);
2080 put_tty_driver(serial_driver);
2081
Geert Uytterhoeven826e8c82009-04-05 13:12:30 +02002082 rs_table[0].info = NULL;
2083 kfree(info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084
Geert Uytterhoeven5edc3042008-12-30 14:13:41 +01002085 free_irq(IRQ_AMIGA_TBE, rs_table);
2086 free_irq(IRQ_AMIGA_RBF, rs_table);
2087
Geert Uytterhoeven826e8c82009-04-05 13:12:30 +02002088 platform_set_drvdata(pdev, NULL);
2089
2090 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091}
2092
Geert Uytterhoeven826e8c82009-04-05 13:12:30 +02002093static struct platform_driver amiga_serial_driver = {
2094 .remove = __exit_p(amiga_serial_remove),
2095 .driver = {
2096 .name = "amiga-serial",
2097 .owner = THIS_MODULE,
2098 },
2099};
2100
2101static int __init amiga_serial_init(void)
2102{
2103 return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
2104}
2105
2106module_init(amiga_serial_init);
2107
2108static void __exit amiga_serial_exit(void)
2109{
2110 platform_driver_unregister(&amiga_serial_driver);
2111}
2112
2113module_exit(amiga_serial_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114
2115
Geert Uytterhoevend1a35e42008-10-26 19:51:14 +01002116#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2117
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118/*
2119 * ------------------------------------------------------------
2120 * Serial console driver
2121 * ------------------------------------------------------------
2122 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123
2124static void amiga_serial_putc(char c)
2125{
2126 custom.serdat = (unsigned char)c | 0x100;
2127 while (!(custom.serdatr & 0x2000))
2128 barrier();
2129}
2130
2131/*
2132 * Print a string to the serial port trying not to disturb
2133 * any possible real use of the port...
2134 *
2135 * The console must be locked when we get here.
2136 */
2137static void serial_console_write(struct console *co, const char *s,
2138 unsigned count)
2139{
2140 unsigned short intena = custom.intenar;
2141
2142 custom.intena = IF_TBE;
2143
2144 while (count--) {
2145 if (*s == '\n')
2146 amiga_serial_putc('\r');
2147 amiga_serial_putc(*s++);
2148 }
2149
2150 custom.intena = IF_SETCLR | (intena & IF_TBE);
2151}
2152
2153static struct tty_driver *serial_console_device(struct console *c, int *index)
2154{
2155 *index = 0;
2156 return serial_driver;
2157}
2158
2159static struct console sercons = {
2160 .name = "ttyS",
2161 .write = serial_console_write,
2162 .device = serial_console_device,
2163 .flags = CON_PRINTBUFFER,
2164 .index = -1,
2165};
2166
2167/*
2168 * Register console.
2169 */
2170static int __init amiserial_console_init(void)
2171{
2172 register_console(&sercons);
2173 return 0;
2174}
2175console_initcall(amiserial_console_init);
Geert Uytterhoevend1a35e42008-10-26 19:51:14 +01002176
2177#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002178
2179MODULE_LICENSE("GPL");
Geert Uytterhoeven826e8c82009-04-05 13:12:30 +02002180MODULE_ALIAS("platform:amiga-serial");