blob: 0e2b72f2b8871d96f124581bba1ee724c2f936c0 [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>
82#include <linux/slab.h>
83#include <linux/init.h>
84#include <linux/bitops.h>
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
Al Virob4290a22006-01-12 01:06:12 -080095#define custom amiga_custom
Linus Torvalds1da177e2005-04-16 15:20:36 -070096static char *serial_name = "Amiga-builtin serial driver";
97
98static 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
103static struct async_struct *IRQ_ports;
104
105static unsigned char current_ctl_bits;
106
Alan Cox606d0992006-12-08 02:38:45 -0800107static void change_speed(struct async_struct *info, struct ktermios *old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
109
110
111static struct serial_state rs_table[1];
112
Tobias Klauserfe971072006-01-09 20:54:02 -0800113#define NR_PORTS ARRAY_SIZE(rs_table)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#include <asm/uaccess.h>
116
117#define serial_isroot() (capable(CAP_SYS_ADMIN))
118
119
120static inline int serial_paranoia_check(struct async_struct *info,
121 char *name, const char *routine)
122{
123#ifdef SERIAL_PARANOIA_CHECK
124 static const char *badmagic =
125 "Warning: bad magic number for serial struct (%s) in %s\n";
126 static const char *badinfo =
127 "Warning: null async_struct for (%s) in %s\n";
128
129 if (!info) {
130 printk(badinfo, name, routine);
131 return 1;
132 }
133 if (info->magic != SERIAL_MAGIC) {
134 printk(badmagic, name, routine);
135 return 1;
136 }
137#endif
138 return 0;
139}
140
141/* some serial hardware definitions */
142#define SDR_OVRUN (1<<15)
143#define SDR_RBF (1<<14)
144#define SDR_TBE (1<<13)
145#define SDR_TSRE (1<<12)
146
147#define SERPER_PARENB (1<<15)
148
149#define AC_SETCLR (1<<15)
150#define AC_UARTBRK (1<<11)
151
152#define SER_DTR (1<<7)
153#define SER_RTS (1<<6)
154#define SER_DCD (1<<5)
155#define SER_CTS (1<<4)
156#define SER_DSR (1<<3)
157
158static __inline__ void rtsdtr_ctrl(int bits)
159{
160 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
161}
162
163/*
164 * ------------------------------------------------------------
165 * rs_stop() and rs_start()
166 *
167 * This routines are called before setting or resetting tty->stopped.
168 * They enable or disable transmitter interrupts, as necessary.
169 * ------------------------------------------------------------
170 */
171static void rs_stop(struct tty_struct *tty)
172{
173 struct async_struct *info = (struct async_struct *)tty->driver_data;
174 unsigned long flags;
175
176 if (serial_paranoia_check(info, tty->name, "rs_stop"))
177 return;
178
179 local_irq_save(flags);
180 if (info->IER & UART_IER_THRI) {
181 info->IER &= ~UART_IER_THRI;
182 /* disable Tx interrupt and remove any pending interrupts */
183 custom.intena = IF_TBE;
184 mb();
185 custom.intreq = IF_TBE;
186 mb();
187 }
188 local_irq_restore(flags);
189}
190
191static void rs_start(struct tty_struct *tty)
192{
193 struct async_struct *info = (struct async_struct *)tty->driver_data;
194 unsigned long flags;
195
196 if (serial_paranoia_check(info, tty->name, "rs_start"))
197 return;
198
199 local_irq_save(flags);
200 if (info->xmit.head != info->xmit.tail
201 && info->xmit.buf
202 && !(info->IER & UART_IER_THRI)) {
203 info->IER |= UART_IER_THRI;
204 custom.intena = IF_SETCLR | IF_TBE;
205 mb();
206 /* set a pending Tx Interrupt, transmitter should restart now */
207 custom.intreq = IF_SETCLR | IF_TBE;
208 mb();
209 }
210 local_irq_restore(flags);
211}
212
213/*
214 * ----------------------------------------------------------------------
215 *
216 * Here starts the interrupt handling routines. All of the following
217 * subroutines are declared as inline and are folded into
218 * rs_interrupt(). They were separated out for readability's sake.
219 *
220 * Note: rs_interrupt() is a "fast" interrupt, which means that it
221 * runs with interrupts turned off. People who may want to modify
222 * rs_interrupt() should try to keep the interrupt handler as fast as
223 * possible. After you are done making modifications, it is not a bad
224 * idea to do:
225 *
226 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
227 *
228 * and look at the resulting assemble code in serial.s.
229 *
230 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
231 * -----------------------------------------------------------------------
232 */
233
234/*
235 * This routine is used by the interrupt handler to schedule
236 * processing in the software interrupt portion of the driver.
237 */
Adrian Bunk41c28ff2006-03-23 03:00:56 -0800238static void rs_sched_event(struct async_struct *info,
239 int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240{
241 info->event |= 1 << event;
242 tasklet_schedule(&info->tlet);
243}
244
Adrian Bunk41c28ff2006-03-23 03:00:56 -0800245static void receive_chars(struct async_struct *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
247 int status;
248 int serdatr;
249 struct tty_struct *tty = info->tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800250 unsigned char ch, flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 struct async_icount *icount;
Alan Cox33f0f882006-01-09 20:54:13 -0800252 int oe = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 icount = &info->state->icount;
255
256 status = UART_LSR_DR; /* We obviously have a character! */
257 serdatr = custom.serdatr;
258 mb();
259 custom.intreq = IF_RBF;
260 mb();
261
262 if((serdatr & 0x1ff) == 0)
263 status |= UART_LSR_BI;
264 if(serdatr & SDR_OVRUN)
265 status |= UART_LSR_OE;
266
267 ch = serdatr & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 icount->rx++;
269
270#ifdef SERIAL_DEBUG_INTR
271 printk("DR%02x:%02x...", ch, status);
272#endif
Alan Cox33f0f882006-01-09 20:54:13 -0800273 flag = TTY_NORMAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
275 /*
276 * We don't handle parity or frame errors - but I have left
277 * the code in, since I'm not sure that the errors can't be
278 * detected.
279 */
280
281 if (status & (UART_LSR_BI | UART_LSR_PE |
282 UART_LSR_FE | UART_LSR_OE)) {
283 /*
284 * For statistics only
285 */
286 if (status & UART_LSR_BI) {
287 status &= ~(UART_LSR_FE | UART_LSR_PE);
288 icount->brk++;
289 } else if (status & UART_LSR_PE)
290 icount->parity++;
291 else if (status & UART_LSR_FE)
292 icount->frame++;
293 if (status & UART_LSR_OE)
294 icount->overrun++;
295
296 /*
297 * Now check to see if character should be
298 * ignored, and mask off conditions which
299 * should be ignored.
300 */
301 if (status & info->ignore_status_mask)
Alan Cox33f0f882006-01-09 20:54:13 -0800302 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 status &= info->read_status_mask;
305
306 if (status & (UART_LSR_BI)) {
307#ifdef SERIAL_DEBUG_INTR
308 printk("handling break....");
309#endif
Alan Cox33f0f882006-01-09 20:54:13 -0800310 flag = TTY_BREAK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 if (info->flags & ASYNC_SAK)
312 do_SAK(tty);
313 } else if (status & UART_LSR_PE)
Alan Cox33f0f882006-01-09 20:54:13 -0800314 flag = TTY_PARITY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 else if (status & UART_LSR_FE)
Alan Cox33f0f882006-01-09 20:54:13 -0800316 flag = TTY_FRAME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 if (status & UART_LSR_OE) {
318 /*
319 * Overrun is special, since it's
320 * reported immediately, and doesn't
321 * affect the current character
322 */
Alan Cox33f0f882006-01-09 20:54:13 -0800323 oe = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 }
325 }
Alan Cox33f0f882006-01-09 20:54:13 -0800326 tty_insert_flip_char(tty, ch, flag);
327 if (oe == 1)
328 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 tty_flip_buffer_push(tty);
Alan Cox33f0f882006-01-09 20:54:13 -0800330out:
331 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332}
333
Adrian Bunk41c28ff2006-03-23 03:00:56 -0800334static void transmit_chars(struct async_struct *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335{
336 custom.intreq = IF_TBE;
337 mb();
338 if (info->x_char) {
339 custom.serdat = info->x_char | 0x100;
340 mb();
341 info->state->icount.tx++;
342 info->x_char = 0;
343 return;
344 }
345 if (info->xmit.head == info->xmit.tail
346 || info->tty->stopped
347 || info->tty->hw_stopped) {
348 info->IER &= ~UART_IER_THRI;
349 custom.intena = IF_TBE;
350 mb();
351 return;
352 }
353
354 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
355 mb();
356 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
357 info->state->icount.tx++;
358
359 if (CIRC_CNT(info->xmit.head,
360 info->xmit.tail,
361 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
362 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
363
364#ifdef SERIAL_DEBUG_INTR
365 printk("THRE...");
366#endif
367 if (info->xmit.head == info->xmit.tail) {
368 custom.intena = IF_TBE;
369 mb();
370 info->IER &= ~UART_IER_THRI;
371 }
372}
373
Adrian Bunk41c28ff2006-03-23 03:00:56 -0800374static void check_modem_status(struct async_struct *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
376 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
377 unsigned char dstatus;
378 struct async_icount *icount;
379
380 /* Determine bits that have changed */
381 dstatus = status ^ current_ctl_bits;
382 current_ctl_bits = status;
383
384 if (dstatus) {
385 icount = &info->state->icount;
386 /* update input line counters */
387 if (dstatus & SER_DSR)
388 icount->dsr++;
389 if (dstatus & SER_DCD) {
390 icount->dcd++;
391#ifdef CONFIG_HARD_PPS
392 if ((info->flags & ASYNC_HARDPPS_CD) &&
393 !(status & SER_DCD))
394 hardpps();
395#endif
396 }
397 if (dstatus & SER_CTS)
398 icount->cts++;
399 wake_up_interruptible(&info->delta_msr_wait);
400 }
401
402 if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
403#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
404 printk("ttyS%d CD now %s...", info->line,
405 (!(status & SER_DCD)) ? "on" : "off");
406#endif
407 if (!(status & SER_DCD))
408 wake_up_interruptible(&info->open_wait);
409 else {
410#ifdef SERIAL_DEBUG_OPEN
411 printk("doing serial hangup...");
412#endif
413 if (info->tty)
414 tty_hangup(info->tty);
415 }
416 }
417 if (info->flags & ASYNC_CTS_FLOW) {
418 if (info->tty->hw_stopped) {
419 if (!(status & SER_CTS)) {
420#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
421 printk("CTS tx start...");
422#endif
423 info->tty->hw_stopped = 0;
424 info->IER |= UART_IER_THRI;
425 custom.intena = IF_SETCLR | IF_TBE;
426 mb();
427 /* set a pending Tx Interrupt, transmitter should restart now */
428 custom.intreq = IF_SETCLR | IF_TBE;
429 mb();
430 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
431 return;
432 }
433 } else {
434 if ((status & SER_CTS)) {
435#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
436 printk("CTS tx stop...");
437#endif
438 info->tty->hw_stopped = 1;
439 info->IER &= ~UART_IER_THRI;
440 /* disable Tx interrupt and remove any pending interrupts */
441 custom.intena = IF_TBE;
442 mb();
443 custom.intreq = IF_TBE;
444 mb();
445 }
446 }
447 }
448}
449
David Howells7d12e782006-10-05 14:55:46 +0100450static irqreturn_t ser_vbl_int( int irq, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451{
452 /* vbl is just a periodic interrupt we tie into to update modem status */
453 struct async_struct * info = IRQ_ports;
454 /*
455 * TBD - is it better to unregister from this interrupt or to
456 * ignore it if MSI is clear ?
457 */
458 if(info->IER & UART_IER_MSI)
459 check_modem_status(info);
460 return IRQ_HANDLED;
461}
462
David Howells7d12e782006-10-05 14:55:46 +0100463static irqreturn_t ser_rx_int(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
465 struct async_struct * info;
466
467#ifdef SERIAL_DEBUG_INTR
468 printk("ser_rx_int...");
469#endif
470
471 info = IRQ_ports;
472 if (!info || !info->tty)
473 return IRQ_NONE;
474
475 receive_chars(info);
476 info->last_active = jiffies;
477#ifdef SERIAL_DEBUG_INTR
478 printk("end.\n");
479#endif
480 return IRQ_HANDLED;
481}
482
David Howells7d12e782006-10-05 14:55:46 +0100483static irqreturn_t ser_tx_int(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484{
485 struct async_struct * info;
486
487 if (custom.serdatr & SDR_TBE) {
488#ifdef SERIAL_DEBUG_INTR
489 printk("ser_tx_int...");
490#endif
491
492 info = IRQ_ports;
493 if (!info || !info->tty)
494 return IRQ_NONE;
495
496 transmit_chars(info);
497 info->last_active = jiffies;
498#ifdef SERIAL_DEBUG_INTR
499 printk("end.\n");
500#endif
501 }
502 return IRQ_HANDLED;
503}
504
505/*
506 * -------------------------------------------------------------------
507 * Here ends the serial interrupt routines.
508 * -------------------------------------------------------------------
509 */
510
511/*
512 * This routine is used to handle the "bottom half" processing for the
513 * serial driver, known also the "software interrupt" processing.
514 * This processing is done at the kernel interrupt level, after the
515 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
516 * is where time-consuming activities which can not be done in the
517 * interrupt driver proper are done; the interrupt driver schedules
518 * them using rs_sched_event(), and they get done here.
519 */
520
521static void do_softint(unsigned long private_)
522{
523 struct async_struct *info = (struct async_struct *) private_;
524 struct tty_struct *tty;
525
526 tty = info->tty;
527 if (!tty)
528 return;
529
Jiri Slabyb963a842007-02-10 01:44:55 -0800530 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 tty_wakeup(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532}
533
534/*
535 * ---------------------------------------------------------------
536 * Low level utility subroutines for the serial driver: routines to
537 * figure out the appropriate timeout for an interrupt chain, routines
538 * to initialize and startup a serial port, and routines to shutdown a
539 * serial port. Useful stuff like that.
540 * ---------------------------------------------------------------
541 */
542
543static int startup(struct async_struct * info)
544{
545 unsigned long flags;
546 int retval=0;
547 unsigned long page;
548
549 page = get_zeroed_page(GFP_KERNEL);
550 if (!page)
551 return -ENOMEM;
552
553 local_irq_save(flags);
554
555 if (info->flags & ASYNC_INITIALIZED) {
556 free_page(page);
557 goto errout;
558 }
559
560 if (info->xmit.buf)
561 free_page(page);
562 else
563 info->xmit.buf = (unsigned char *) page;
564
565#ifdef SERIAL_DEBUG_OPEN
566 printk("starting up ttys%d ...", info->line);
567#endif
568
569 /* Clear anything in the input buffer */
570
571 custom.intreq = IF_RBF;
572 mb();
573
574 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
575 if (retval) {
576 if (serial_isroot()) {
577 if (info->tty)
578 set_bit(TTY_IO_ERROR,
579 &info->tty->flags);
580 retval = 0;
581 }
582 goto errout;
583 }
584
585 /* enable both Rx and Tx interrupts */
586 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
587 mb();
588 info->IER = UART_IER_MSI;
589
590 /* remember current state of the DCD and CTS bits */
591 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
592
593 IRQ_ports = info;
594
595 info->MCR = 0;
596 if (info->tty->termios->c_cflag & CBAUD)
597 info->MCR = SER_DTR | SER_RTS;
598 rtsdtr_ctrl(info->MCR);
599
600 if (info->tty)
601 clear_bit(TTY_IO_ERROR, &info->tty->flags);
602 info->xmit.head = info->xmit.tail = 0;
603
604 /*
605 * Set up the tty->alt_speed kludge
606 */
607 if (info->tty) {
608 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
609 info->tty->alt_speed = 57600;
610 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
611 info->tty->alt_speed = 115200;
612 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
613 info->tty->alt_speed = 230400;
614 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
615 info->tty->alt_speed = 460800;
616 }
617
618 /*
619 * and set the speed of the serial port
620 */
621 change_speed(info, NULL);
622
623 info->flags |= ASYNC_INITIALIZED;
624 local_irq_restore(flags);
625 return 0;
626
627errout:
628 local_irq_restore(flags);
629 return retval;
630}
631
632/*
633 * This routine will shutdown a serial port; interrupts are disabled, and
634 * DTR is dropped if the hangup on close termio flag is on.
635 */
636static void shutdown(struct async_struct * info)
637{
638 unsigned long flags;
639 struct serial_state *state;
640
641 if (!(info->flags & ASYNC_INITIALIZED))
642 return;
643
644 state = info->state;
645
646#ifdef SERIAL_DEBUG_OPEN
647 printk("Shutting down serial port %d ....\n", info->line);
648#endif
649
650 local_irq_save(flags); /* Disable interrupts */
651
652 /*
653 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
654 * here so the queue might never be waken up
655 */
656 wake_up_interruptible(&info->delta_msr_wait);
657
658 IRQ_ports = NULL;
659
660 /*
661 * Free the IRQ, if necessary
662 */
663 free_irq(IRQ_AMIGA_VERTB, info);
664
665 if (info->xmit.buf) {
666 free_page((unsigned long) info->xmit.buf);
667 info->xmit.buf = NULL;
668 }
669
670 info->IER = 0;
671 custom.intena = IF_RBF | IF_TBE;
672 mb();
673
674 /* disable break condition */
675 custom.adkcon = AC_UARTBRK;
676 mb();
677
678 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
679 info->MCR &= ~(SER_DTR|SER_RTS);
680 rtsdtr_ctrl(info->MCR);
681
682 if (info->tty)
683 set_bit(TTY_IO_ERROR, &info->tty->flags);
684
685 info->flags &= ~ASYNC_INITIALIZED;
686 local_irq_restore(flags);
687}
688
689
690/*
691 * This routine is called to set the UART divisor registers to match
692 * the specified baud rate for a serial port.
693 */
694static void change_speed(struct async_struct *info,
Alan Cox606d0992006-12-08 02:38:45 -0800695 struct ktermios *old_termios)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696{
697 int quot = 0, baud_base, baud;
698 unsigned cflag, cval = 0;
699 int bits;
700 unsigned long flags;
701
702 if (!info->tty || !info->tty->termios)
703 return;
704 cflag = info->tty->termios->c_cflag;
705
706 /* Byte size is always 8 bits plus parity bit if requested */
707
708 cval = 3; bits = 10;
709 if (cflag & CSTOPB) {
710 cval |= 0x04;
711 bits++;
712 }
713 if (cflag & PARENB) {
714 cval |= UART_LCR_PARITY;
715 bits++;
716 }
717 if (!(cflag & PARODD))
718 cval |= UART_LCR_EPAR;
719#ifdef CMSPAR
720 if (cflag & CMSPAR)
721 cval |= UART_LCR_SPAR;
722#endif
723
724 /* Determine divisor based on baud rate */
725 baud = tty_get_baud_rate(info->tty);
726 if (!baud)
727 baud = 9600; /* B0 transition handled in rs_set_termios */
728 baud_base = info->state->baud_base;
729 if (baud == 38400 &&
730 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
731 quot = info->state->custom_divisor;
732 else {
733 if (baud == 134)
734 /* Special case since 134 is really 134.5 */
735 quot = (2*baud_base / 269);
736 else if (baud)
737 quot = baud_base / baud;
738 }
739 /* If the quotient is zero refuse the change */
740 if (!quot && old_termios) {
741 info->tty->termios->c_cflag &= ~CBAUD;
742 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
743 baud = tty_get_baud_rate(info->tty);
744 if (!baud)
745 baud = 9600;
746 if (baud == 38400 &&
747 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
748 quot = info->state->custom_divisor;
749 else {
750 if (baud == 134)
751 /* Special case since 134 is really 134.5 */
752 quot = (2*baud_base / 269);
753 else if (baud)
754 quot = baud_base / baud;
755 }
756 }
757 /* As a last resort, if the quotient is zero, default to 9600 bps */
758 if (!quot)
759 quot = baud_base / 9600;
760 info->quot = quot;
761 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
762 info->timeout += HZ/50; /* Add .02 seconds of slop */
763
764 /* CTS flow control flag and modem status interrupts */
765 info->IER &= ~UART_IER_MSI;
766 if (info->flags & ASYNC_HARDPPS_CD)
767 info->IER |= UART_IER_MSI;
768 if (cflag & CRTSCTS) {
769 info->flags |= ASYNC_CTS_FLOW;
770 info->IER |= UART_IER_MSI;
771 } else
772 info->flags &= ~ASYNC_CTS_FLOW;
773 if (cflag & CLOCAL)
774 info->flags &= ~ASYNC_CHECK_CD;
775 else {
776 info->flags |= ASYNC_CHECK_CD;
777 info->IER |= UART_IER_MSI;
778 }
779 /* TBD:
780 * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
781 */
782
783 /*
784 * Set up parity check flag
785 */
786#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
787
788 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
789 if (I_INPCK(info->tty))
790 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
791 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
792 info->read_status_mask |= UART_LSR_BI;
793
794 /*
795 * Characters to ignore
796 */
797 info->ignore_status_mask = 0;
798 if (I_IGNPAR(info->tty))
799 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
800 if (I_IGNBRK(info->tty)) {
801 info->ignore_status_mask |= UART_LSR_BI;
802 /*
803 * If we're ignore parity and break indicators, ignore
804 * overruns too. (For real raw support).
805 */
806 if (I_IGNPAR(info->tty))
807 info->ignore_status_mask |= UART_LSR_OE;
808 }
809 /*
810 * !!! ignore all characters if CREAD is not set
811 */
812 if ((cflag & CREAD) == 0)
813 info->ignore_status_mask |= UART_LSR_DR;
814 local_irq_save(flags);
815
816 {
817 short serper;
818
819 /* Set up the baud rate */
820 serper = quot - 1;
821
822 /* Enable or disable parity bit */
823
824 if(cval & UART_LCR_PARITY)
825 serper |= (SERPER_PARENB);
826
827 custom.serper = serper;
828 mb();
829 }
830
831 info->LCR = cval; /* Save LCR */
832 local_irq_restore(flags);
833}
834
835static void rs_put_char(struct tty_struct *tty, unsigned char ch)
836{
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700837 struct async_struct *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 unsigned long flags;
839
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700840 if (!tty)
841 return;
842
843 info = tty->driver_data;
844
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
846 return;
847
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700848 if (!info->xmit.buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 return;
850
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);
856 return;
857 }
858
859 info->xmit.buf[info->xmit.head++] = ch;
860 info->xmit.head &= SERIAL_XMIT_SIZE-1;
861 local_irq_restore(flags);
862}
863
864static void rs_flush_chars(struct tty_struct *tty)
865{
866 struct async_struct *info = (struct async_struct *)tty->driver_data;
867 unsigned long flags;
868
869 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
870 return;
871
872 if (info->xmit.head == info->xmit.tail
873 || tty->stopped
874 || tty->hw_stopped
875 || !info->xmit.buf)
876 return;
877
878 local_irq_save(flags);
879 info->IER |= UART_IER_THRI;
880 custom.intena = IF_SETCLR | IF_TBE;
881 mb();
882 /* set a pending Tx Interrupt, transmitter should restart now */
883 custom.intreq = IF_SETCLR | IF_TBE;
884 mb();
885 local_irq_restore(flags);
886}
887
888static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
889{
890 int c, ret = 0;
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700891 struct async_struct *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 unsigned long flags;
893
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700894 if (!tty)
895 return 0;
896
897 info = tty->driver_data;
898
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 if (serial_paranoia_check(info, tty->name, "rs_write"))
900 return 0;
901
Jiri Slabyb3218a72006-10-04 02:15:27 -0700902 if (!info->xmit.buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 return 0;
904
Jiri Kosina3abf3be2007-02-10 01:46:48 -0800905 local_irq_save(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 while (1) {
907 c = CIRC_SPACE_TO_END(info->xmit.head,
908 info->xmit.tail,
909 SERIAL_XMIT_SIZE);
910 if (count < c)
911 c = count;
912 if (c <= 0) {
913 break;
914 }
915 memcpy(info->xmit.buf + info->xmit.head, buf, c);
916 info->xmit.head = ((info->xmit.head + c) &
917 (SERIAL_XMIT_SIZE-1));
918 buf += c;
919 count -= c;
920 ret += c;
921 }
922 local_irq_restore(flags);
923
924 if (info->xmit.head != info->xmit.tail
925 && !tty->stopped
926 && !tty->hw_stopped
927 && !(info->IER & UART_IER_THRI)) {
928 info->IER |= UART_IER_THRI;
929 local_irq_disable();
930 custom.intena = IF_SETCLR | IF_TBE;
931 mb();
932 /* set a pending Tx Interrupt, transmitter should restart now */
933 custom.intreq = IF_SETCLR | IF_TBE;
934 mb();
935 local_irq_restore(flags);
936 }
937 return ret;
938}
939
940static int rs_write_room(struct tty_struct *tty)
941{
942 struct async_struct *info = (struct async_struct *)tty->driver_data;
943
944 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
945 return 0;
946 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
947}
948
949static int rs_chars_in_buffer(struct tty_struct *tty)
950{
951 struct async_struct *info = (struct async_struct *)tty->driver_data;
952
953 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
954 return 0;
955 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
956}
957
958static void rs_flush_buffer(struct tty_struct *tty)
959{
960 struct async_struct *info = (struct async_struct *)tty->driver_data;
961 unsigned long flags;
962
963 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
964 return;
965 local_irq_save(flags);
966 info->xmit.head = info->xmit.tail = 0;
967 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 tty_wakeup(tty);
969}
970
971/*
972 * This function is used to send a high-priority XON/XOFF character to
973 * the device
974 */
975static void rs_send_xchar(struct tty_struct *tty, char ch)
976{
977 struct async_struct *info = (struct async_struct *)tty->driver_data;
978 unsigned long flags;
979
980 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
981 return;
982
983 info->x_char = ch;
984 if (ch) {
985 /* Make sure transmit interrupts are on */
986
987 /* Check this ! */
988 local_irq_save(flags);
989 if(!(custom.intenar & IF_TBE)) {
990 custom.intena = IF_SETCLR | IF_TBE;
991 mb();
992 /* set a pending Tx Interrupt, transmitter should restart now */
993 custom.intreq = IF_SETCLR | IF_TBE;
994 mb();
995 }
996 local_irq_restore(flags);
997
998 info->IER |= UART_IER_THRI;
999 }
1000}
1001
1002/*
1003 * ------------------------------------------------------------
1004 * rs_throttle()
1005 *
1006 * This routine is called by the upper-layer tty layer to signal that
1007 * incoming characters should be throttled.
1008 * ------------------------------------------------------------
1009 */
1010static void rs_throttle(struct tty_struct * tty)
1011{
1012 struct async_struct *info = (struct async_struct *)tty->driver_data;
1013 unsigned long flags;
1014#ifdef SERIAL_DEBUG_THROTTLE
1015 char buf[64];
1016
1017 printk("throttle %s: %d....\n", tty_name(tty, buf),
1018 tty->ldisc.chars_in_buffer(tty));
1019#endif
1020
1021 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1022 return;
1023
1024 if (I_IXOFF(tty))
1025 rs_send_xchar(tty, STOP_CHAR(tty));
1026
1027 if (tty->termios->c_cflag & CRTSCTS)
1028 info->MCR &= ~SER_RTS;
1029
1030 local_irq_save(flags);
1031 rtsdtr_ctrl(info->MCR);
1032 local_irq_restore(flags);
1033}
1034
1035static void rs_unthrottle(struct tty_struct * tty)
1036{
1037 struct async_struct *info = (struct async_struct *)tty->driver_data;
1038 unsigned long flags;
1039#ifdef SERIAL_DEBUG_THROTTLE
1040 char buf[64];
1041
1042 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1043 tty->ldisc.chars_in_buffer(tty));
1044#endif
1045
1046 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1047 return;
1048
1049 if (I_IXOFF(tty)) {
1050 if (info->x_char)
1051 info->x_char = 0;
1052 else
1053 rs_send_xchar(tty, START_CHAR(tty));
1054 }
1055 if (tty->termios->c_cflag & CRTSCTS)
1056 info->MCR |= SER_RTS;
1057 local_irq_save(flags);
1058 rtsdtr_ctrl(info->MCR);
1059 local_irq_restore(flags);
1060}
1061
1062/*
1063 * ------------------------------------------------------------
1064 * rs_ioctl() and friends
1065 * ------------------------------------------------------------
1066 */
1067
1068static int get_serial_info(struct async_struct * info,
Al Viroab14cae2006-01-12 01:06:30 -08001069 struct serial_struct __user * retinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070{
1071 struct serial_struct tmp;
1072 struct serial_state *state = info->state;
1073
1074 if (!retinfo)
1075 return -EFAULT;
1076 memset(&tmp, 0, sizeof(tmp));
1077 tmp.type = state->type;
1078 tmp.line = state->line;
1079 tmp.port = state->port;
1080 tmp.irq = state->irq;
1081 tmp.flags = state->flags;
1082 tmp.xmit_fifo_size = state->xmit_fifo_size;
1083 tmp.baud_base = state->baud_base;
1084 tmp.close_delay = state->close_delay;
1085 tmp.closing_wait = state->closing_wait;
1086 tmp.custom_divisor = state->custom_divisor;
1087 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;
1102 state = info->state;
1103 old_state = *state;
1104
1105 change_irq = new_serial.irq != state->irq;
1106 change_port = (new_serial.port != state->port);
1107 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
1108 return -EINVAL;
1109
1110 if (!serial_isroot()) {
1111 if ((new_serial.baud_base != state->baud_base) ||
1112 (new_serial.close_delay != state->close_delay) ||
1113 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1114 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1115 (state->flags & ~ASYNC_USR_MASK)))
1116 return -EPERM;
1117 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1118 (new_serial.flags & ASYNC_USR_MASK));
1119 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1120 (new_serial.flags & ASYNC_USR_MASK));
1121 state->custom_divisor = new_serial.custom_divisor;
1122 goto check_and_exit;
1123 }
1124
1125 if (new_serial.baud_base < 9600)
1126 return -EINVAL;
1127
1128 /*
1129 * OK, past this point, all the error checking has been done.
1130 * At this point, we start making changes.....
1131 */
1132
1133 state->baud_base = new_serial.baud_base;
1134 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1135 (new_serial.flags & ASYNC_FLAGS));
1136 info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1137 (info->flags & ASYNC_INTERNAL_FLAGS));
1138 state->custom_divisor = new_serial.custom_divisor;
1139 state->close_delay = new_serial.close_delay * HZ/100;
1140 state->closing_wait = new_serial.closing_wait * HZ/100;
1141 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1142
1143check_and_exit:
1144 if (info->flags & ASYNC_INITIALIZED) {
1145 if (((old_state.flags & ASYNC_SPD_MASK) !=
1146 (state->flags & ASYNC_SPD_MASK)) ||
1147 (old_state.custom_divisor != state->custom_divisor)) {
1148 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1149 info->tty->alt_speed = 57600;
1150 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1151 info->tty->alt_speed = 115200;
1152 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1153 info->tty->alt_speed = 230400;
1154 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1155 info->tty->alt_speed = 460800;
1156 change_speed(info, NULL);
1157 }
1158 } else
1159 retval = startup(info);
1160 return retval;
1161}
1162
1163
1164/*
1165 * get_lsr_info - get line status register info
1166 *
1167 * Purpose: Let user call ioctl() to get info when the UART physically
1168 * is emptied. On bus types like RS485, the transmitter must
1169 * release the bus after transmitting. This must be done when
1170 * the transmit shift register is empty, not be done when the
1171 * transmit holding register is empty. This functionality
1172 * allows an RS485 driver to be written in user space.
1173 */
Al Viroab14cae2006-01-12 01:06:30 -08001174static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175{
1176 unsigned char status;
1177 unsigned int result;
1178 unsigned long flags;
1179
1180 local_irq_save(flags);
1181 status = custom.serdatr;
1182 mb();
1183 local_irq_restore(flags);
1184 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1185 if (copy_to_user(value, &result, sizeof(int)))
1186 return -EFAULT;
1187 return 0;
1188}
1189
1190
1191static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1192{
1193 struct async_struct * info = (struct async_struct *)tty->driver_data;
1194 unsigned char control, status;
1195 unsigned long flags;
1196
1197 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1198 return -ENODEV;
1199 if (tty->flags & (1 << TTY_IO_ERROR))
1200 return -EIO;
1201
1202 control = info->MCR;
1203 local_irq_save(flags);
1204 status = ciab.pra;
1205 local_irq_restore(flags);
1206 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1207 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1208 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1209 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1210 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1211}
1212
1213static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1214 unsigned int set, unsigned int clear)
1215{
1216 struct async_struct * info = (struct async_struct *)tty->driver_data;
1217 unsigned long flags;
1218
1219 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1220 return -ENODEV;
1221 if (tty->flags & (1 << TTY_IO_ERROR))
1222 return -EIO;
1223
1224 local_irq_save(flags);
1225 if (set & TIOCM_RTS)
1226 info->MCR |= SER_RTS;
1227 if (set & TIOCM_DTR)
1228 info->MCR |= SER_DTR;
1229 if (clear & TIOCM_RTS)
1230 info->MCR &= ~SER_RTS;
1231 if (clear & TIOCM_DTR)
1232 info->MCR &= ~SER_DTR;
1233 rtsdtr_ctrl(info->MCR);
1234 local_irq_restore(flags);
1235 return 0;
1236}
1237
1238/*
1239 * rs_break() --- routine which turns the break handling on or off
1240 */
1241static void rs_break(struct tty_struct *tty, int break_state)
1242{
1243 struct async_struct * info = (struct async_struct *)tty->driver_data;
1244 unsigned long flags;
1245
1246 if (serial_paranoia_check(info, tty->name, "rs_break"))
1247 return;
1248
1249 local_irq_save(flags);
1250 if (break_state == -1)
1251 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1252 else
1253 custom.adkcon = AC_UARTBRK;
1254 mb();
1255 local_irq_restore(flags);
1256}
1257
1258
1259static int rs_ioctl(struct tty_struct *tty, struct file * file,
1260 unsigned int cmd, unsigned long arg)
1261{
1262 struct async_struct * info = (struct async_struct *)tty->driver_data;
1263 struct async_icount cprev, cnow; /* kernel counter temps */
1264 struct serial_icounter_struct icount;
Al Viroab14cae2006-01-12 01:06:30 -08001265 void __user *argp = (void __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 unsigned long flags;
1267
1268 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1269 return -ENODEV;
1270
1271 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1272 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1273 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1274 if (tty->flags & (1 << TTY_IO_ERROR))
1275 return -EIO;
1276 }
1277
1278 switch (cmd) {
1279 case TIOCGSERIAL:
Al Viroab14cae2006-01-12 01:06:30 -08001280 return get_serial_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 case TIOCSSERIAL:
Al Viroab14cae2006-01-12 01:06:30 -08001282 return set_serial_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 case TIOCSERCONFIG:
1284 return 0;
1285
1286 case TIOCSERGETLSR: /* Get line status register */
Al Viroab14cae2006-01-12 01:06:30 -08001287 return get_lsr_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288
1289 case TIOCSERGSTRUCT:
Al Viroab14cae2006-01-12 01:06:30 -08001290 if (copy_to_user(argp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 info, sizeof(struct async_struct)))
1292 return -EFAULT;
1293 return 0;
1294
1295 /*
1296 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1297 * - mask passed in arg for lines of interest
1298 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1299 * Caller should use TIOCGICOUNT to see which one it was
1300 */
1301 case TIOCMIWAIT:
1302 local_irq_save(flags);
1303 /* note the counters on entry */
1304 cprev = info->state->icount;
1305 local_irq_restore(flags);
1306 while (1) {
1307 interruptible_sleep_on(&info->delta_msr_wait);
1308 /* see if a signal did it */
1309 if (signal_pending(current))
1310 return -ERESTARTSYS;
1311 local_irq_save(flags);
1312 cnow = info->state->icount; /* atomic copy */
1313 local_irq_restore(flags);
1314 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1315 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1316 return -EIO; /* no change => error */
1317 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1318 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1319 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1320 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1321 return 0;
1322 }
1323 cprev = cnow;
1324 }
1325 /* NOTREACHED */
1326
1327 /*
1328 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1329 * Return: write counters to the user passed counter struct
1330 * NB: both 1->0 and 0->1 transitions are counted except for
1331 * RI where only 0->1 is counted.
1332 */
1333 case TIOCGICOUNT:
1334 local_irq_save(flags);
1335 cnow = info->state->icount;
1336 local_irq_restore(flags);
1337 icount.cts = cnow.cts;
1338 icount.dsr = cnow.dsr;
1339 icount.rng = cnow.rng;
1340 icount.dcd = cnow.dcd;
1341 icount.rx = cnow.rx;
1342 icount.tx = cnow.tx;
1343 icount.frame = cnow.frame;
1344 icount.overrun = cnow.overrun;
1345 icount.parity = cnow.parity;
1346 icount.brk = cnow.brk;
1347 icount.buf_overrun = cnow.buf_overrun;
1348
Al Viroab14cae2006-01-12 01:06:30 -08001349 if (copy_to_user(argp, &icount, sizeof(icount)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 return -EFAULT;
1351 return 0;
1352 case TIOCSERGWILD:
1353 case TIOCSERSWILD:
1354 /* "setserial -W" is called in Debian boot */
1355 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1356 return 0;
1357
1358 default:
1359 return -ENOIOCTLCMD;
1360 }
1361 return 0;
1362}
1363
Alan Cox606d0992006-12-08 02:38:45 -08001364static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365{
1366 struct async_struct *info = (struct async_struct *)tty->driver_data;
1367 unsigned long flags;
1368 unsigned int cflag = tty->termios->c_cflag;
1369
1370 if ( (cflag == old_termios->c_cflag)
1371 && ( RELEVANT_IFLAG(tty->termios->c_iflag)
1372 == RELEVANT_IFLAG(old_termios->c_iflag)))
1373 return;
1374
1375 change_speed(info, old_termios);
1376
1377 /* Handle transition to B0 status */
1378 if ((old_termios->c_cflag & CBAUD) &&
1379 !(cflag & CBAUD)) {
1380 info->MCR &= ~(SER_DTR|SER_RTS);
1381 local_irq_save(flags);
1382 rtsdtr_ctrl(info->MCR);
1383 local_irq_restore(flags);
1384 }
1385
1386 /* Handle transition away from B0 status */
1387 if (!(old_termios->c_cflag & CBAUD) &&
1388 (cflag & CBAUD)) {
1389 info->MCR |= SER_DTR;
1390 if (!(tty->termios->c_cflag & CRTSCTS) ||
1391 !test_bit(TTY_THROTTLED, &tty->flags)) {
1392 info->MCR |= SER_RTS;
1393 }
1394 local_irq_save(flags);
1395 rtsdtr_ctrl(info->MCR);
1396 local_irq_restore(flags);
1397 }
1398
1399 /* Handle turning off CRTSCTS */
1400 if ((old_termios->c_cflag & CRTSCTS) &&
1401 !(tty->termios->c_cflag & CRTSCTS)) {
1402 tty->hw_stopped = 0;
1403 rs_start(tty);
1404 }
1405
1406#if 0
1407 /*
1408 * No need to wake up processes in open wait, since they
1409 * sample the CLOCAL flag once, and don't recheck it.
1410 * XXX It's not clear whether the current behavior is correct
1411 * or not. Hence, this may change.....
1412 */
1413 if (!(old_termios->c_cflag & CLOCAL) &&
1414 (tty->termios->c_cflag & CLOCAL))
1415 wake_up_interruptible(&info->open_wait);
1416#endif
1417}
1418
1419/*
1420 * ------------------------------------------------------------
1421 * rs_close()
1422 *
1423 * This routine is called when the serial port gets closed. First, we
1424 * wait for the last remaining data to be sent. Then, we unlink its
1425 * async structure from the interrupt chain if necessary, and we free
1426 * that IRQ if nothing is left in the chain.
1427 * ------------------------------------------------------------
1428 */
1429static void rs_close(struct tty_struct *tty, struct file * filp)
1430{
1431 struct async_struct * info = (struct async_struct *)tty->driver_data;
1432 struct serial_state *state;
1433 unsigned long flags;
1434
1435 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1436 return;
1437
1438 state = info->state;
1439
1440 local_irq_save(flags);
1441
1442 if (tty_hung_up_p(filp)) {
1443 DBG_CNT("before DEC-hung");
1444 local_irq_restore(flags);
1445 return;
1446 }
1447
1448#ifdef SERIAL_DEBUG_OPEN
1449 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1450#endif
1451 if ((tty->count == 1) && (state->count != 1)) {
1452 /*
1453 * Uh, oh. tty->count is 1, which means that the tty
1454 * structure will be freed. state->count should always
1455 * be one in these conditions. If it's greater than
1456 * one, we've got real problems, since it means the
1457 * serial port won't be shutdown.
1458 */
1459 printk("rs_close: bad serial port count; tty->count is 1, "
1460 "state->count is %d\n", state->count);
1461 state->count = 1;
1462 }
1463 if (--state->count < 0) {
1464 printk("rs_close: bad serial port count for ttys%d: %d\n",
1465 info->line, state->count);
1466 state->count = 0;
1467 }
1468 if (state->count) {
1469 DBG_CNT("before DEC-2");
1470 local_irq_restore(flags);
1471 return;
1472 }
1473 info->flags |= ASYNC_CLOSING;
1474 /*
1475 * Now we wait for the transmit buffer to clear; and we notify
1476 * the line discipline to only process XON/XOFF characters.
1477 */
1478 tty->closing = 1;
1479 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1480 tty_wait_until_sent(tty, info->closing_wait);
1481 /*
1482 * At this point we stop accepting input. To do this, we
1483 * disable the receive line status interrupts, and tell the
1484 * interrupt driver to stop checking the data ready bit in the
1485 * line status register.
1486 */
1487 info->read_status_mask &= ~UART_LSR_DR;
1488 if (info->flags & ASYNC_INITIALIZED) {
1489 /* disable receive interrupts */
1490 custom.intena = IF_RBF;
1491 mb();
1492 /* clear any pending receive interrupt */
1493 custom.intreq = IF_RBF;
1494 mb();
1495
1496 /*
1497 * Before we drop DTR, make sure the UART transmitter
1498 * has completely drained; this is especially
1499 * important if there is a transmit FIFO!
1500 */
1501 rs_wait_until_sent(tty, info->timeout);
1502 }
1503 shutdown(info);
1504 if (tty->driver->flush_buffer)
1505 tty->driver->flush_buffer(tty);
1506
1507 tty_ldisc_flush(tty);
1508 tty->closing = 0;
1509 info->event = 0;
1510 info->tty = NULL;
1511 if (info->blocked_open) {
1512 if (info->close_delay) {
1513 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1514 }
1515 wake_up_interruptible(&info->open_wait);
1516 }
1517 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1518 wake_up_interruptible(&info->close_wait);
1519 local_irq_restore(flags);
1520}
1521
1522/*
1523 * rs_wait_until_sent() --- wait until the transmitter is empty
1524 */
1525static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1526{
1527 struct async_struct * info = (struct async_struct *)tty->driver_data;
1528 unsigned long orig_jiffies, char_time;
1529 int lsr;
1530
1531 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1532 return;
1533
1534 if (info->xmit_fifo_size == 0)
1535 return; /* Just in case.... */
1536
1537 orig_jiffies = jiffies;
1538 /*
1539 * Set the check interval to be 1/5 of the estimated time to
1540 * send a single character, and make it at least 1. The check
1541 * interval should also be less than the timeout.
1542 *
1543 * Note: we have to use pretty tight timings here to satisfy
1544 * the NIST-PCTS.
1545 */
1546 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1547 char_time = char_time / 5;
1548 if (char_time == 0)
1549 char_time = 1;
1550 if (timeout)
1551 char_time = min_t(unsigned long, char_time, timeout);
1552 /*
1553 * If the transmitter hasn't cleared in twice the approximate
1554 * amount of time to send the entire FIFO, it probably won't
1555 * ever clear. This assumes the UART isn't doing flow
1556 * control, which is currently the case. Hence, if it ever
1557 * takes longer than info->timeout, this is probably due to a
1558 * UART bug of some kind. So, we clamp the timeout parameter at
1559 * 2*info->timeout.
1560 */
1561 if (!timeout || timeout > 2*info->timeout)
1562 timeout = 2*info->timeout;
1563#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1564 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1565 printk("jiff=%lu...", jiffies);
1566#endif
1567 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1568#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1569 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1570#endif
1571 msleep_interruptible(jiffies_to_msecs(char_time));
1572 if (signal_pending(current))
1573 break;
1574 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1575 break;
1576 }
1577 current->state = TASK_RUNNING;
1578#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1579 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1580#endif
1581}
1582
1583/*
1584 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1585 */
1586static void rs_hangup(struct tty_struct *tty)
1587{
1588 struct async_struct * info = (struct async_struct *)tty->driver_data;
1589 struct serial_state *state = info->state;
1590
1591 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1592 return;
1593
1594 state = info->state;
1595
1596 rs_flush_buffer(tty);
1597 shutdown(info);
1598 info->event = 0;
1599 state->count = 0;
1600 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1601 info->tty = NULL;
1602 wake_up_interruptible(&info->open_wait);
1603}
1604
1605/*
1606 * ------------------------------------------------------------
1607 * rs_open() and friends
1608 * ------------------------------------------------------------
1609 */
1610static int block_til_ready(struct tty_struct *tty, struct file * filp,
1611 struct async_struct *info)
1612{
1613#ifdef DECLARE_WAITQUEUE
1614 DECLARE_WAITQUEUE(wait, current);
1615#else
1616 struct wait_queue wait = { current, NULL };
1617#endif
1618 struct serial_state *state = info->state;
1619 int retval;
1620 int do_clocal = 0, extra_count = 0;
1621 unsigned long flags;
1622
1623 /*
1624 * If the device is in the middle of being closed, then block
1625 * until it's done, and then try again.
1626 */
1627 if (tty_hung_up_p(filp) ||
1628 (info->flags & ASYNC_CLOSING)) {
1629 if (info->flags & ASYNC_CLOSING)
1630 interruptible_sleep_on(&info->close_wait);
1631#ifdef SERIAL_DO_RESTART
1632 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1633 -EAGAIN : -ERESTARTSYS);
1634#else
1635 return -EAGAIN;
1636#endif
1637 }
1638
1639 /*
1640 * If non-blocking mode is set, or the port is not enabled,
1641 * then make the check up front and then exit.
1642 */
1643 if ((filp->f_flags & O_NONBLOCK) ||
1644 (tty->flags & (1 << TTY_IO_ERROR))) {
1645 info->flags |= ASYNC_NORMAL_ACTIVE;
1646 return 0;
1647 }
1648
1649 if (tty->termios->c_cflag & CLOCAL)
1650 do_clocal = 1;
1651
1652 /*
1653 * Block waiting for the carrier detect and the line to become
1654 * free (i.e., not in use by the callout). While we are in
1655 * this loop, state->count is dropped by one, so that
1656 * rs_close() knows when to free things. We restore it upon
1657 * exit, either normal or abnormal.
1658 */
1659 retval = 0;
1660 add_wait_queue(&info->open_wait, &wait);
1661#ifdef SERIAL_DEBUG_OPEN
1662 printk("block_til_ready before block: ttys%d, count = %d\n",
1663 state->line, state->count);
1664#endif
1665 local_irq_save(flags);
1666 if (!tty_hung_up_p(filp)) {
1667 extra_count = 1;
1668 state->count--;
1669 }
1670 local_irq_restore(flags);
1671 info->blocked_open++;
1672 while (1) {
1673 local_irq_save(flags);
1674 if (tty->termios->c_cflag & CBAUD)
1675 rtsdtr_ctrl(SER_DTR|SER_RTS);
1676 local_irq_restore(flags);
1677 set_current_state(TASK_INTERRUPTIBLE);
1678 if (tty_hung_up_p(filp) ||
1679 !(info->flags & ASYNC_INITIALIZED)) {
1680#ifdef SERIAL_DO_RESTART
1681 if (info->flags & ASYNC_HUP_NOTIFY)
1682 retval = -EAGAIN;
1683 else
1684 retval = -ERESTARTSYS;
1685#else
1686 retval = -EAGAIN;
1687#endif
1688 break;
1689 }
1690 if (!(info->flags & ASYNC_CLOSING) &&
1691 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1692 break;
1693 if (signal_pending(current)) {
1694 retval = -ERESTARTSYS;
1695 break;
1696 }
1697#ifdef SERIAL_DEBUG_OPEN
1698 printk("block_til_ready blocking: ttys%d, count = %d\n",
1699 info->line, state->count);
1700#endif
1701 schedule();
1702 }
1703 current->state = TASK_RUNNING;
1704 remove_wait_queue(&info->open_wait, &wait);
1705 if (extra_count)
1706 state->count++;
1707 info->blocked_open--;
1708#ifdef SERIAL_DEBUG_OPEN
1709 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1710 info->line, state->count);
1711#endif
1712 if (retval)
1713 return retval;
1714 info->flags |= ASYNC_NORMAL_ACTIVE;
1715 return 0;
1716}
1717
1718static int get_async_struct(int line, struct async_struct **ret_info)
1719{
1720 struct async_struct *info;
1721 struct serial_state *sstate;
1722
1723 sstate = rs_table + line;
1724 sstate->count++;
1725 if (sstate->info) {
1726 *ret_info = sstate->info;
1727 return 0;
1728 }
1729 info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
1730 if (!info) {
1731 sstate->count--;
1732 return -ENOMEM;
1733 }
1734 memset(info, 0, sizeof(struct async_struct));
1735#ifdef DECLARE_WAITQUEUE
1736 init_waitqueue_head(&info->open_wait);
1737 init_waitqueue_head(&info->close_wait);
1738 init_waitqueue_head(&info->delta_msr_wait);
1739#endif
1740 info->magic = SERIAL_MAGIC;
1741 info->port = sstate->port;
1742 info->flags = sstate->flags;
1743 info->xmit_fifo_size = sstate->xmit_fifo_size;
1744 info->line = line;
1745 tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1746 info->state = sstate;
1747 if (sstate->info) {
1748 kfree(info);
1749 *ret_info = sstate->info;
1750 return 0;
1751 }
1752 *ret_info = sstate->info = info;
1753 return 0;
1754}
1755
1756/*
1757 * This routine is called whenever a serial port is opened. It
1758 * enables interrupts for a serial port, linking in its async structure into
1759 * the IRQ chain. It also performs the serial-specific
1760 * initialization for the tty structure.
1761 */
1762static int rs_open(struct tty_struct *tty, struct file * filp)
1763{
1764 struct async_struct *info;
1765 int retval, line;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766
1767 line = tty->index;
1768 if ((line < 0) || (line >= NR_PORTS)) {
1769 return -ENODEV;
1770 }
1771 retval = get_async_struct(line, &info);
1772 if (retval) {
1773 return retval;
1774 }
1775 tty->driver_data = info;
1776 info->tty = tty;
1777 if (serial_paranoia_check(info, tty->name, "rs_open"))
1778 return -ENODEV;
1779
1780#ifdef SERIAL_DEBUG_OPEN
1781 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1782#endif
1783 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1784
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 /*
1786 * If the port is the middle of closing, bail out now
1787 */
1788 if (tty_hung_up_p(filp) ||
1789 (info->flags & ASYNC_CLOSING)) {
1790 if (info->flags & ASYNC_CLOSING)
1791 interruptible_sleep_on(&info->close_wait);
1792#ifdef SERIAL_DO_RESTART
1793 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1794 -EAGAIN : -ERESTARTSYS);
1795#else
1796 return -EAGAIN;
1797#endif
1798 }
1799
1800 /*
1801 * Start up serial port
1802 */
1803 retval = startup(info);
1804 if (retval) {
1805 return retval;
1806 }
1807
1808 retval = block_til_ready(tty, filp, info);
1809 if (retval) {
1810#ifdef SERIAL_DEBUG_OPEN
1811 printk("rs_open returning after block_til_ready with %d\n",
1812 retval);
1813#endif
1814 return retval;
1815 }
1816
1817#ifdef SERIAL_DEBUG_OPEN
1818 printk("rs_open %s successful...", tty->name);
1819#endif
1820 return 0;
1821}
1822
1823/*
1824 * /proc fs routines....
1825 */
1826
1827static inline int line_info(char *buf, struct serial_state *state)
1828{
1829 struct async_struct *info = state->info, scr_info;
1830 char stat_buf[30], control, status;
1831 int ret;
1832 unsigned long flags;
1833
1834 ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1835
1836 /*
1837 * Figure out the current RS-232 lines
1838 */
1839 if (!info) {
1840 info = &scr_info; /* This is just for serial_{in,out} */
1841
1842 info->magic = SERIAL_MAGIC;
1843 info->flags = state->flags;
1844 info->quot = 0;
1845 info->tty = NULL;
1846 }
1847 local_irq_save(flags);
1848 status = ciab.pra;
1849 control = info ? info->MCR : status;
1850 local_irq_restore(flags);
1851
1852 stat_buf[0] = 0;
1853 stat_buf[1] = 0;
1854 if(!(control & SER_RTS))
1855 strcat(stat_buf, "|RTS");
1856 if(!(status & SER_CTS))
1857 strcat(stat_buf, "|CTS");
1858 if(!(control & SER_DTR))
1859 strcat(stat_buf, "|DTR");
1860 if(!(status & SER_DSR))
1861 strcat(stat_buf, "|DSR");
1862 if(!(status & SER_DCD))
1863 strcat(stat_buf, "|CD");
1864
1865 if (info->quot) {
1866 ret += sprintf(buf+ret, " baud:%d",
1867 state->baud_base / info->quot);
1868 }
1869
1870 ret += sprintf(buf+ret, " tx:%d rx:%d",
1871 state->icount.tx, state->icount.rx);
1872
1873 if (state->icount.frame)
1874 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1875
1876 if (state->icount.parity)
1877 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1878
1879 if (state->icount.brk)
1880 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1881
1882 if (state->icount.overrun)
1883 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1884
1885 /*
1886 * Last thing is the RS-232 status lines
1887 */
1888 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1889 return ret;
1890}
1891
1892static int rs_read_proc(char *page, char **start, off_t off, int count,
1893 int *eof, void *data)
1894{
1895 int len = 0, l;
1896 off_t begin = 0;
1897
1898 len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1899 l = line_info(page + len, &rs_table[0]);
1900 len += l;
1901 if (len+begin > off+count)
1902 goto done;
1903 if (len+begin < off) {
1904 begin += len;
1905 len = 0;
1906 }
1907 *eof = 1;
1908done:
1909 if (off >= len+begin)
1910 return 0;
1911 *start = page + (off-begin);
1912 return ((count < begin+len-off) ? count : begin+len-off);
1913}
1914
1915/*
1916 * ---------------------------------------------------------------------
1917 * rs_init() and friends
1918 *
1919 * rs_init() is called at boot-time to initialize the serial driver.
1920 * ---------------------------------------------------------------------
1921 */
1922
1923/*
1924 * This routine prints out the appropriate serial driver version
1925 * number, and identifies which options were configured into this
1926 * driver.
1927 */
Adrian Bunk41c28ff2006-03-23 03:00:56 -08001928static void show_serial_version(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929{
1930 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1931}
1932
1933
Jeff Dikeb68e31d2006-10-02 02:17:18 -07001934static const struct tty_operations serial_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935 .open = rs_open,
1936 .close = rs_close,
1937 .write = rs_write,
1938 .put_char = rs_put_char,
1939 .flush_chars = rs_flush_chars,
1940 .write_room = rs_write_room,
1941 .chars_in_buffer = rs_chars_in_buffer,
1942 .flush_buffer = rs_flush_buffer,
1943 .ioctl = rs_ioctl,
1944 .throttle = rs_throttle,
1945 .unthrottle = rs_unthrottle,
1946 .set_termios = rs_set_termios,
1947 .stop = rs_stop,
1948 .start = rs_start,
1949 .hangup = rs_hangup,
1950 .break_ctl = rs_break,
1951 .send_xchar = rs_send_xchar,
1952 .wait_until_sent = rs_wait_until_sent,
1953 .read_proc = rs_read_proc,
1954 .tiocmget = rs_tiocmget,
1955 .tiocmset = rs_tiocmset,
1956};
1957
1958/*
1959 * The serial driver boot-time initialization code!
1960 */
1961static int __init rs_init(void)
1962{
1963 unsigned long flags;
1964 struct serial_state * state;
1965
1966 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1967 return -ENODEV;
1968
1969 serial_driver = alloc_tty_driver(1);
1970 if (!serial_driver)
1971 return -ENOMEM;
1972
1973 /*
1974 * We request SERDAT and SERPER only, because the serial registers are
1975 * too spreaded over the custom register space
1976 */
1977 if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
1978 return -EBUSY;
1979
1980 IRQ_ports = NULL;
1981
1982 show_serial_version();
1983
1984 /* Initialize the tty_driver structure */
1985
1986 serial_driver->owner = THIS_MODULE;
1987 serial_driver->driver_name = "amiserial";
1988 serial_driver->name = "ttyS";
1989 serial_driver->major = TTY_MAJOR;
1990 serial_driver->minor_start = 64;
1991 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1992 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1993 serial_driver->init_termios = tty_std_termios;
1994 serial_driver->init_termios.c_cflag =
1995 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1996 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1997 tty_set_operations(serial_driver, &serial_ops);
1998
1999 if (tty_register_driver(serial_driver))
2000 panic("Couldn't register serial driver\n");
2001
2002 state = rs_table;
2003 state->magic = SSTATE_MAGIC;
2004 state->port = (int)&custom.serdatr; /* Just to give it a value */
2005 state->line = 0;
2006 state->custom_divisor = 0;
2007 state->close_delay = 5*HZ/10;
2008 state->closing_wait = 30*HZ;
2009 state->icount.cts = state->icount.dsr =
2010 state->icount.rng = state->icount.dcd = 0;
2011 state->icount.rx = state->icount.tx = 0;
2012 state->icount.frame = state->icount.parity = 0;
2013 state->icount.overrun = state->icount.brk = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014
2015 printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2016 state->line);
2017
2018 /* Hardware set up */
2019
2020 state->baud_base = amiga_colorclock;
2021 state->xmit_fifo_size = 1;
2022
2023 local_irq_save(flags);
2024
2025 /* set ISRs, and then disable the rx interrupts */
2026 request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
Thomas Gleixner0f2ed4c2006-07-01 19:29:33 -07002027 request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028
2029 /* turn off Rx and Tx interrupts */
2030 custom.intena = IF_RBF | IF_TBE;
2031 mb();
2032
2033 /* clear any pending interrupt */
2034 custom.intreq = IF_RBF | IF_TBE;
2035 mb();
2036
2037 local_irq_restore(flags);
2038
2039 /*
2040 * set the appropriate directions for the modem control flags,
2041 * and clear RTS and DTR
2042 */
2043 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2044 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2045
2046 return 0;
2047}
2048
2049static __exit void rs_exit(void)
2050{
2051 int error;
2052 struct async_struct *info = rs_table[0].info;
2053
2054 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2055 tasklet_kill(&info->tlet);
2056 if ((error = tty_unregister_driver(serial_driver)))
2057 printk("SERIAL: failed to unregister serial driver (%d)\n",
2058 error);
2059 put_tty_driver(serial_driver);
2060
2061 if (info) {
2062 rs_table[0].info = NULL;
2063 kfree(info);
2064 }
2065
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066 release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2067}
2068
2069module_init(rs_init)
2070module_exit(rs_exit)
2071
2072
2073/*
2074 * ------------------------------------------------------------
2075 * Serial console driver
2076 * ------------------------------------------------------------
2077 */
2078#ifdef CONFIG_SERIAL_CONSOLE
2079
2080static void amiga_serial_putc(char c)
2081{
2082 custom.serdat = (unsigned char)c | 0x100;
2083 while (!(custom.serdatr & 0x2000))
2084 barrier();
2085}
2086
2087/*
2088 * Print a string to the serial port trying not to disturb
2089 * any possible real use of the port...
2090 *
2091 * The console must be locked when we get here.
2092 */
2093static void serial_console_write(struct console *co, const char *s,
2094 unsigned count)
2095{
2096 unsigned short intena = custom.intenar;
2097
2098 custom.intena = IF_TBE;
2099
2100 while (count--) {
2101 if (*s == '\n')
2102 amiga_serial_putc('\r');
2103 amiga_serial_putc(*s++);
2104 }
2105
2106 custom.intena = IF_SETCLR | (intena & IF_TBE);
2107}
2108
2109static struct tty_driver *serial_console_device(struct console *c, int *index)
2110{
2111 *index = 0;
2112 return serial_driver;
2113}
2114
2115static struct console sercons = {
2116 .name = "ttyS",
2117 .write = serial_console_write,
2118 .device = serial_console_device,
2119 .flags = CON_PRINTBUFFER,
2120 .index = -1,
2121};
2122
2123/*
2124 * Register console.
2125 */
2126static int __init amiserial_console_init(void)
2127{
2128 register_console(&sercons);
2129 return 0;
2130}
2131console_initcall(amiserial_console_init);
2132#endif
2133
2134MODULE_LICENSE("GPL");