blob: feb4ac802a0d1e44f8fef6d24a7e7638a0d3b563 [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
530 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
531 tty_wakeup(tty);
532 wake_up_interruptible(&tty->write_wait);
533 }
534}
535
536/*
537 * ---------------------------------------------------------------
538 * Low level utility subroutines for the serial driver: routines to
539 * figure out the appropriate timeout for an interrupt chain, routines
540 * to initialize and startup a serial port, and routines to shutdown a
541 * serial port. Useful stuff like that.
542 * ---------------------------------------------------------------
543 */
544
545static int startup(struct async_struct * info)
546{
547 unsigned long flags;
548 int retval=0;
549 unsigned long page;
550
551 page = get_zeroed_page(GFP_KERNEL);
552 if (!page)
553 return -ENOMEM;
554
555 local_irq_save(flags);
556
557 if (info->flags & ASYNC_INITIALIZED) {
558 free_page(page);
559 goto errout;
560 }
561
562 if (info->xmit.buf)
563 free_page(page);
564 else
565 info->xmit.buf = (unsigned char *) page;
566
567#ifdef SERIAL_DEBUG_OPEN
568 printk("starting up ttys%d ...", info->line);
569#endif
570
571 /* Clear anything in the input buffer */
572
573 custom.intreq = IF_RBF;
574 mb();
575
576 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
577 if (retval) {
578 if (serial_isroot()) {
579 if (info->tty)
580 set_bit(TTY_IO_ERROR,
581 &info->tty->flags);
582 retval = 0;
583 }
584 goto errout;
585 }
586
587 /* enable both Rx and Tx interrupts */
588 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
589 mb();
590 info->IER = UART_IER_MSI;
591
592 /* remember current state of the DCD and CTS bits */
593 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
594
595 IRQ_ports = info;
596
597 info->MCR = 0;
598 if (info->tty->termios->c_cflag & CBAUD)
599 info->MCR = SER_DTR | SER_RTS;
600 rtsdtr_ctrl(info->MCR);
601
602 if (info->tty)
603 clear_bit(TTY_IO_ERROR, &info->tty->flags);
604 info->xmit.head = info->xmit.tail = 0;
605
606 /*
607 * Set up the tty->alt_speed kludge
608 */
609 if (info->tty) {
610 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
611 info->tty->alt_speed = 57600;
612 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
613 info->tty->alt_speed = 115200;
614 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
615 info->tty->alt_speed = 230400;
616 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
617 info->tty->alt_speed = 460800;
618 }
619
620 /*
621 * and set the speed of the serial port
622 */
623 change_speed(info, NULL);
624
625 info->flags |= ASYNC_INITIALIZED;
626 local_irq_restore(flags);
627 return 0;
628
629errout:
630 local_irq_restore(flags);
631 return retval;
632}
633
634/*
635 * This routine will shutdown a serial port; interrupts are disabled, and
636 * DTR is dropped if the hangup on close termio flag is on.
637 */
638static void shutdown(struct async_struct * info)
639{
640 unsigned long flags;
641 struct serial_state *state;
642
643 if (!(info->flags & ASYNC_INITIALIZED))
644 return;
645
646 state = info->state;
647
648#ifdef SERIAL_DEBUG_OPEN
649 printk("Shutting down serial port %d ....\n", info->line);
650#endif
651
652 local_irq_save(flags); /* Disable interrupts */
653
654 /*
655 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
656 * here so the queue might never be waken up
657 */
658 wake_up_interruptible(&info->delta_msr_wait);
659
660 IRQ_ports = NULL;
661
662 /*
663 * Free the IRQ, if necessary
664 */
665 free_irq(IRQ_AMIGA_VERTB, info);
666
667 if (info->xmit.buf) {
668 free_page((unsigned long) info->xmit.buf);
669 info->xmit.buf = NULL;
670 }
671
672 info->IER = 0;
673 custom.intena = IF_RBF | IF_TBE;
674 mb();
675
676 /* disable break condition */
677 custom.adkcon = AC_UARTBRK;
678 mb();
679
680 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
681 info->MCR &= ~(SER_DTR|SER_RTS);
682 rtsdtr_ctrl(info->MCR);
683
684 if (info->tty)
685 set_bit(TTY_IO_ERROR, &info->tty->flags);
686
687 info->flags &= ~ASYNC_INITIALIZED;
688 local_irq_restore(flags);
689}
690
691
692/*
693 * This routine is called to set the UART divisor registers to match
694 * the specified baud rate for a serial port.
695 */
696static void change_speed(struct async_struct *info,
Alan Cox606d0992006-12-08 02:38:45 -0800697 struct ktermios *old_termios)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698{
699 int quot = 0, baud_base, baud;
700 unsigned cflag, cval = 0;
701 int bits;
702 unsigned long flags;
703
704 if (!info->tty || !info->tty->termios)
705 return;
706 cflag = info->tty->termios->c_cflag;
707
708 /* Byte size is always 8 bits plus parity bit if requested */
709
710 cval = 3; bits = 10;
711 if (cflag & CSTOPB) {
712 cval |= 0x04;
713 bits++;
714 }
715 if (cflag & PARENB) {
716 cval |= UART_LCR_PARITY;
717 bits++;
718 }
719 if (!(cflag & PARODD))
720 cval |= UART_LCR_EPAR;
721#ifdef CMSPAR
722 if (cflag & CMSPAR)
723 cval |= UART_LCR_SPAR;
724#endif
725
726 /* Determine divisor based on baud rate */
727 baud = tty_get_baud_rate(info->tty);
728 if (!baud)
729 baud = 9600; /* B0 transition handled in rs_set_termios */
730 baud_base = info->state->baud_base;
731 if (baud == 38400 &&
732 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
733 quot = info->state->custom_divisor;
734 else {
735 if (baud == 134)
736 /* Special case since 134 is really 134.5 */
737 quot = (2*baud_base / 269);
738 else if (baud)
739 quot = baud_base / baud;
740 }
741 /* If the quotient is zero refuse the change */
742 if (!quot && old_termios) {
743 info->tty->termios->c_cflag &= ~CBAUD;
744 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
745 baud = tty_get_baud_rate(info->tty);
746 if (!baud)
747 baud = 9600;
748 if (baud == 38400 &&
749 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
750 quot = info->state->custom_divisor;
751 else {
752 if (baud == 134)
753 /* Special case since 134 is really 134.5 */
754 quot = (2*baud_base / 269);
755 else if (baud)
756 quot = baud_base / baud;
757 }
758 }
759 /* As a last resort, if the quotient is zero, default to 9600 bps */
760 if (!quot)
761 quot = baud_base / 9600;
762 info->quot = quot;
763 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
764 info->timeout += HZ/50; /* Add .02 seconds of slop */
765
766 /* CTS flow control flag and modem status interrupts */
767 info->IER &= ~UART_IER_MSI;
768 if (info->flags & ASYNC_HARDPPS_CD)
769 info->IER |= UART_IER_MSI;
770 if (cflag & CRTSCTS) {
771 info->flags |= ASYNC_CTS_FLOW;
772 info->IER |= UART_IER_MSI;
773 } else
774 info->flags &= ~ASYNC_CTS_FLOW;
775 if (cflag & CLOCAL)
776 info->flags &= ~ASYNC_CHECK_CD;
777 else {
778 info->flags |= ASYNC_CHECK_CD;
779 info->IER |= UART_IER_MSI;
780 }
781 /* TBD:
782 * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
783 */
784
785 /*
786 * Set up parity check flag
787 */
788#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
789
790 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
791 if (I_INPCK(info->tty))
792 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
793 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
794 info->read_status_mask |= UART_LSR_BI;
795
796 /*
797 * Characters to ignore
798 */
799 info->ignore_status_mask = 0;
800 if (I_IGNPAR(info->tty))
801 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
802 if (I_IGNBRK(info->tty)) {
803 info->ignore_status_mask |= UART_LSR_BI;
804 /*
805 * If we're ignore parity and break indicators, ignore
806 * overruns too. (For real raw support).
807 */
808 if (I_IGNPAR(info->tty))
809 info->ignore_status_mask |= UART_LSR_OE;
810 }
811 /*
812 * !!! ignore all characters if CREAD is not set
813 */
814 if ((cflag & CREAD) == 0)
815 info->ignore_status_mask |= UART_LSR_DR;
816 local_irq_save(flags);
817
818 {
819 short serper;
820
821 /* Set up the baud rate */
822 serper = quot - 1;
823
824 /* Enable or disable parity bit */
825
826 if(cval & UART_LCR_PARITY)
827 serper |= (SERPER_PARENB);
828
829 custom.serper = serper;
830 mb();
831 }
832
833 info->LCR = cval; /* Save LCR */
834 local_irq_restore(flags);
835}
836
837static void rs_put_char(struct tty_struct *tty, unsigned char ch)
838{
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700839 struct async_struct *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 unsigned long flags;
841
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700842 if (!tty)
843 return;
844
845 info = tty->driver_data;
846
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
848 return;
849
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700850 if (!info->xmit.buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 return;
852
853 local_irq_save(flags);
854 if (CIRC_SPACE(info->xmit.head,
855 info->xmit.tail,
856 SERIAL_XMIT_SIZE) == 0) {
857 local_irq_restore(flags);
858 return;
859 }
860
861 info->xmit.buf[info->xmit.head++] = ch;
862 info->xmit.head &= SERIAL_XMIT_SIZE-1;
863 local_irq_restore(flags);
864}
865
866static void rs_flush_chars(struct tty_struct *tty)
867{
868 struct async_struct *info = (struct async_struct *)tty->driver_data;
869 unsigned long flags;
870
871 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
872 return;
873
874 if (info->xmit.head == info->xmit.tail
875 || tty->stopped
876 || tty->hw_stopped
877 || !info->xmit.buf)
878 return;
879
880 local_irq_save(flags);
881 info->IER |= UART_IER_THRI;
882 custom.intena = IF_SETCLR | IF_TBE;
883 mb();
884 /* set a pending Tx Interrupt, transmitter should restart now */
885 custom.intreq = IF_SETCLR | IF_TBE;
886 mb();
887 local_irq_restore(flags);
888}
889
890static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
891{
892 int c, ret = 0;
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700893 struct async_struct *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 unsigned long flags;
895
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700896 if (!tty)
897 return 0;
898
899 info = tty->driver_data;
900
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 if (serial_paranoia_check(info, tty->name, "rs_write"))
902 return 0;
903
Jiri Slabyb3218a72006-10-04 02:15:27 -0700904 if (!info->xmit.buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 return 0;
906
907 local_save_flags(flags);
908 local_irq_disable();
909 while (1) {
910 c = CIRC_SPACE_TO_END(info->xmit.head,
911 info->xmit.tail,
912 SERIAL_XMIT_SIZE);
913 if (count < c)
914 c = count;
915 if (c <= 0) {
916 break;
917 }
918 memcpy(info->xmit.buf + info->xmit.head, buf, c);
919 info->xmit.head = ((info->xmit.head + c) &
920 (SERIAL_XMIT_SIZE-1));
921 buf += c;
922 count -= c;
923 ret += c;
924 }
925 local_irq_restore(flags);
926
927 if (info->xmit.head != info->xmit.tail
928 && !tty->stopped
929 && !tty->hw_stopped
930 && !(info->IER & UART_IER_THRI)) {
931 info->IER |= UART_IER_THRI;
932 local_irq_disable();
933 custom.intena = IF_SETCLR | IF_TBE;
934 mb();
935 /* set a pending Tx Interrupt, transmitter should restart now */
936 custom.intreq = IF_SETCLR | IF_TBE;
937 mb();
938 local_irq_restore(flags);
939 }
940 return ret;
941}
942
943static int rs_write_room(struct tty_struct *tty)
944{
945 struct async_struct *info = (struct async_struct *)tty->driver_data;
946
947 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
948 return 0;
949 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
950}
951
952static int rs_chars_in_buffer(struct tty_struct *tty)
953{
954 struct async_struct *info = (struct async_struct *)tty->driver_data;
955
956 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
957 return 0;
958 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
959}
960
961static void rs_flush_buffer(struct tty_struct *tty)
962{
963 struct async_struct *info = (struct async_struct *)tty->driver_data;
964 unsigned long flags;
965
966 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
967 return;
968 local_irq_save(flags);
969 info->xmit.head = info->xmit.tail = 0;
970 local_irq_restore(flags);
971 wake_up_interruptible(&tty->write_wait);
972 tty_wakeup(tty);
973}
974
975/*
976 * This function is used to send a high-priority XON/XOFF character to
977 * the device
978 */
979static void rs_send_xchar(struct tty_struct *tty, char ch)
980{
981 struct async_struct *info = (struct async_struct *)tty->driver_data;
982 unsigned long flags;
983
984 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
985 return;
986
987 info->x_char = ch;
988 if (ch) {
989 /* Make sure transmit interrupts are on */
990
991 /* Check this ! */
992 local_irq_save(flags);
993 if(!(custom.intenar & IF_TBE)) {
994 custom.intena = IF_SETCLR | IF_TBE;
995 mb();
996 /* set a pending Tx Interrupt, transmitter should restart now */
997 custom.intreq = IF_SETCLR | IF_TBE;
998 mb();
999 }
1000 local_irq_restore(flags);
1001
1002 info->IER |= UART_IER_THRI;
1003 }
1004}
1005
1006/*
1007 * ------------------------------------------------------------
1008 * rs_throttle()
1009 *
1010 * This routine is called by the upper-layer tty layer to signal that
1011 * incoming characters should be throttled.
1012 * ------------------------------------------------------------
1013 */
1014static void rs_throttle(struct tty_struct * tty)
1015{
1016 struct async_struct *info = (struct async_struct *)tty->driver_data;
1017 unsigned long flags;
1018#ifdef SERIAL_DEBUG_THROTTLE
1019 char buf[64];
1020
1021 printk("throttle %s: %d....\n", tty_name(tty, buf),
1022 tty->ldisc.chars_in_buffer(tty));
1023#endif
1024
1025 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1026 return;
1027
1028 if (I_IXOFF(tty))
1029 rs_send_xchar(tty, STOP_CHAR(tty));
1030
1031 if (tty->termios->c_cflag & CRTSCTS)
1032 info->MCR &= ~SER_RTS;
1033
1034 local_irq_save(flags);
1035 rtsdtr_ctrl(info->MCR);
1036 local_irq_restore(flags);
1037}
1038
1039static void rs_unthrottle(struct tty_struct * tty)
1040{
1041 struct async_struct *info = (struct async_struct *)tty->driver_data;
1042 unsigned long flags;
1043#ifdef SERIAL_DEBUG_THROTTLE
1044 char buf[64];
1045
1046 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1047 tty->ldisc.chars_in_buffer(tty));
1048#endif
1049
1050 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1051 return;
1052
1053 if (I_IXOFF(tty)) {
1054 if (info->x_char)
1055 info->x_char = 0;
1056 else
1057 rs_send_xchar(tty, START_CHAR(tty));
1058 }
1059 if (tty->termios->c_cflag & CRTSCTS)
1060 info->MCR |= SER_RTS;
1061 local_irq_save(flags);
1062 rtsdtr_ctrl(info->MCR);
1063 local_irq_restore(flags);
1064}
1065
1066/*
1067 * ------------------------------------------------------------
1068 * rs_ioctl() and friends
1069 * ------------------------------------------------------------
1070 */
1071
1072static int get_serial_info(struct async_struct * info,
Al Viroab14cae2006-01-12 01:06:30 -08001073 struct serial_struct __user * retinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074{
1075 struct serial_struct tmp;
1076 struct serial_state *state = info->state;
1077
1078 if (!retinfo)
1079 return -EFAULT;
1080 memset(&tmp, 0, sizeof(tmp));
1081 tmp.type = state->type;
1082 tmp.line = state->line;
1083 tmp.port = state->port;
1084 tmp.irq = state->irq;
1085 tmp.flags = state->flags;
1086 tmp.xmit_fifo_size = state->xmit_fifo_size;
1087 tmp.baud_base = state->baud_base;
1088 tmp.close_delay = state->close_delay;
1089 tmp.closing_wait = state->closing_wait;
1090 tmp.custom_divisor = state->custom_divisor;
1091 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1092 return -EFAULT;
1093 return 0;
1094}
1095
1096static int set_serial_info(struct async_struct * info,
Al Viroab14cae2006-01-12 01:06:30 -08001097 struct serial_struct __user * new_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098{
1099 struct serial_struct new_serial;
1100 struct serial_state old_state, *state;
1101 unsigned int change_irq,change_port;
1102 int retval = 0;
1103
1104 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1105 return -EFAULT;
1106 state = info->state;
1107 old_state = *state;
1108
1109 change_irq = new_serial.irq != state->irq;
1110 change_port = (new_serial.port != state->port);
1111 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
1112 return -EINVAL;
1113
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
1129 if (new_serial.baud_base < 9600)
1130 return -EINVAL;
1131
1132 /*
1133 * OK, past this point, all the error checking has been done.
1134 * At this point, we start making changes.....
1135 */
1136
1137 state->baud_base = new_serial.baud_base;
1138 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1139 (new_serial.flags & ASYNC_FLAGS));
1140 info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1141 (info->flags & ASYNC_INTERNAL_FLAGS));
1142 state->custom_divisor = new_serial.custom_divisor;
1143 state->close_delay = new_serial.close_delay * HZ/100;
1144 state->closing_wait = new_serial.closing_wait * HZ/100;
1145 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1146
1147check_and_exit:
1148 if (info->flags & ASYNC_INITIALIZED) {
1149 if (((old_state.flags & ASYNC_SPD_MASK) !=
1150 (state->flags & ASYNC_SPD_MASK)) ||
1151 (old_state.custom_divisor != state->custom_divisor)) {
1152 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1153 info->tty->alt_speed = 57600;
1154 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1155 info->tty->alt_speed = 115200;
1156 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1157 info->tty->alt_speed = 230400;
1158 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1159 info->tty->alt_speed = 460800;
1160 change_speed(info, NULL);
1161 }
1162 } else
1163 retval = startup(info);
1164 return retval;
1165}
1166
1167
1168/*
1169 * get_lsr_info - get line status register info
1170 *
1171 * Purpose: Let user call ioctl() to get info when the UART physically
1172 * is emptied. On bus types like RS485, the transmitter must
1173 * release the bus after transmitting. This must be done when
1174 * the transmit shift register is empty, not be done when the
1175 * transmit holding register is empty. This functionality
1176 * allows an RS485 driver to be written in user space.
1177 */
Al Viroab14cae2006-01-12 01:06:30 -08001178static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179{
1180 unsigned char status;
1181 unsigned int result;
1182 unsigned long flags;
1183
1184 local_irq_save(flags);
1185 status = custom.serdatr;
1186 mb();
1187 local_irq_restore(flags);
1188 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1189 if (copy_to_user(value, &result, sizeof(int)))
1190 return -EFAULT;
1191 return 0;
1192}
1193
1194
1195static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1196{
1197 struct async_struct * info = (struct async_struct *)tty->driver_data;
1198 unsigned char control, status;
1199 unsigned long flags;
1200
1201 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1202 return -ENODEV;
1203 if (tty->flags & (1 << TTY_IO_ERROR))
1204 return -EIO;
1205
1206 control = info->MCR;
1207 local_irq_save(flags);
1208 status = ciab.pra;
1209 local_irq_restore(flags);
1210 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1211 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1212 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1213 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1214 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1215}
1216
1217static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1218 unsigned int set, unsigned int clear)
1219{
1220 struct async_struct * info = (struct async_struct *)tty->driver_data;
1221 unsigned long flags;
1222
1223 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1224 return -ENODEV;
1225 if (tty->flags & (1 << TTY_IO_ERROR))
1226 return -EIO;
1227
1228 local_irq_save(flags);
1229 if (set & TIOCM_RTS)
1230 info->MCR |= SER_RTS;
1231 if (set & TIOCM_DTR)
1232 info->MCR |= SER_DTR;
1233 if (clear & TIOCM_RTS)
1234 info->MCR &= ~SER_RTS;
1235 if (clear & TIOCM_DTR)
1236 info->MCR &= ~SER_DTR;
1237 rtsdtr_ctrl(info->MCR);
1238 local_irq_restore(flags);
1239 return 0;
1240}
1241
1242/*
1243 * rs_break() --- routine which turns the break handling on or off
1244 */
1245static void rs_break(struct tty_struct *tty, int break_state)
1246{
1247 struct async_struct * info = (struct async_struct *)tty->driver_data;
1248 unsigned long flags;
1249
1250 if (serial_paranoia_check(info, tty->name, "rs_break"))
1251 return;
1252
1253 local_irq_save(flags);
1254 if (break_state == -1)
1255 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1256 else
1257 custom.adkcon = AC_UARTBRK;
1258 mb();
1259 local_irq_restore(flags);
1260}
1261
1262
1263static int rs_ioctl(struct tty_struct *tty, struct file * file,
1264 unsigned int cmd, unsigned long arg)
1265{
1266 struct async_struct * info = (struct async_struct *)tty->driver_data;
1267 struct async_icount cprev, cnow; /* kernel counter temps */
1268 struct serial_icounter_struct icount;
Al Viroab14cae2006-01-12 01:06:30 -08001269 void __user *argp = (void __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 unsigned long flags;
1271
1272 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1273 return -ENODEV;
1274
1275 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1276 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1277 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1278 if (tty->flags & (1 << TTY_IO_ERROR))
1279 return -EIO;
1280 }
1281
1282 switch (cmd) {
1283 case TIOCGSERIAL:
Al Viroab14cae2006-01-12 01:06:30 -08001284 return get_serial_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 case TIOCSSERIAL:
Al Viroab14cae2006-01-12 01:06:30 -08001286 return set_serial_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 case TIOCSERCONFIG:
1288 return 0;
1289
1290 case TIOCSERGETLSR: /* Get line status register */
Al Viroab14cae2006-01-12 01:06:30 -08001291 return get_lsr_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
1293 case TIOCSERGSTRUCT:
Al Viroab14cae2006-01-12 01:06:30 -08001294 if (copy_to_user(argp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 info, sizeof(struct async_struct)))
1296 return -EFAULT;
1297 return 0;
1298
1299 /*
1300 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1301 * - mask passed in arg for lines of interest
1302 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1303 * Caller should use TIOCGICOUNT to see which one it was
1304 */
1305 case TIOCMIWAIT:
1306 local_irq_save(flags);
1307 /* note the counters on entry */
1308 cprev = info->state->icount;
1309 local_irq_restore(flags);
1310 while (1) {
1311 interruptible_sleep_on(&info->delta_msr_wait);
1312 /* see if a signal did it */
1313 if (signal_pending(current))
1314 return -ERESTARTSYS;
1315 local_irq_save(flags);
1316 cnow = info->state->icount; /* atomic copy */
1317 local_irq_restore(flags);
1318 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1319 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1320 return -EIO; /* no change => error */
1321 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1322 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1323 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1324 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1325 return 0;
1326 }
1327 cprev = cnow;
1328 }
1329 /* NOTREACHED */
1330
1331 /*
1332 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1333 * Return: write counters to the user passed counter struct
1334 * NB: both 1->0 and 0->1 transitions are counted except for
1335 * RI where only 0->1 is counted.
1336 */
1337 case TIOCGICOUNT:
1338 local_irq_save(flags);
1339 cnow = info->state->icount;
1340 local_irq_restore(flags);
1341 icount.cts = cnow.cts;
1342 icount.dsr = cnow.dsr;
1343 icount.rng = cnow.rng;
1344 icount.dcd = cnow.dcd;
1345 icount.rx = cnow.rx;
1346 icount.tx = cnow.tx;
1347 icount.frame = cnow.frame;
1348 icount.overrun = cnow.overrun;
1349 icount.parity = cnow.parity;
1350 icount.brk = cnow.brk;
1351 icount.buf_overrun = cnow.buf_overrun;
1352
Al Viroab14cae2006-01-12 01:06:30 -08001353 if (copy_to_user(argp, &icount, sizeof(icount)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 return -EFAULT;
1355 return 0;
1356 case TIOCSERGWILD:
1357 case TIOCSERSWILD:
1358 /* "setserial -W" is called in Debian boot */
1359 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1360 return 0;
1361
1362 default:
1363 return -ENOIOCTLCMD;
1364 }
1365 return 0;
1366}
1367
Alan Cox606d0992006-12-08 02:38:45 -08001368static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369{
1370 struct async_struct *info = (struct async_struct *)tty->driver_data;
1371 unsigned long flags;
1372 unsigned int cflag = tty->termios->c_cflag;
1373
1374 if ( (cflag == old_termios->c_cflag)
1375 && ( RELEVANT_IFLAG(tty->termios->c_iflag)
1376 == RELEVANT_IFLAG(old_termios->c_iflag)))
1377 return;
1378
1379 change_speed(info, old_termios);
1380
1381 /* Handle transition to B0 status */
1382 if ((old_termios->c_cflag & CBAUD) &&
1383 !(cflag & CBAUD)) {
1384 info->MCR &= ~(SER_DTR|SER_RTS);
1385 local_irq_save(flags);
1386 rtsdtr_ctrl(info->MCR);
1387 local_irq_restore(flags);
1388 }
1389
1390 /* Handle transition away from B0 status */
1391 if (!(old_termios->c_cflag & CBAUD) &&
1392 (cflag & CBAUD)) {
1393 info->MCR |= SER_DTR;
1394 if (!(tty->termios->c_cflag & CRTSCTS) ||
1395 !test_bit(TTY_THROTTLED, &tty->flags)) {
1396 info->MCR |= SER_RTS;
1397 }
1398 local_irq_save(flags);
1399 rtsdtr_ctrl(info->MCR);
1400 local_irq_restore(flags);
1401 }
1402
1403 /* Handle turning off CRTSCTS */
1404 if ((old_termios->c_cflag & CRTSCTS) &&
1405 !(tty->termios->c_cflag & CRTSCTS)) {
1406 tty->hw_stopped = 0;
1407 rs_start(tty);
1408 }
1409
1410#if 0
1411 /*
1412 * No need to wake up processes in open wait, since they
1413 * sample the CLOCAL flag once, and don't recheck it.
1414 * XXX It's not clear whether the current behavior is correct
1415 * or not. Hence, this may change.....
1416 */
1417 if (!(old_termios->c_cflag & CLOCAL) &&
1418 (tty->termios->c_cflag & CLOCAL))
1419 wake_up_interruptible(&info->open_wait);
1420#endif
1421}
1422
1423/*
1424 * ------------------------------------------------------------
1425 * rs_close()
1426 *
1427 * This routine is called when the serial port gets closed. First, we
1428 * wait for the last remaining data to be sent. Then, we unlink its
1429 * async structure from the interrupt chain if necessary, and we free
1430 * that IRQ if nothing is left in the chain.
1431 * ------------------------------------------------------------
1432 */
1433static void rs_close(struct tty_struct *tty, struct file * filp)
1434{
1435 struct async_struct * info = (struct async_struct *)tty->driver_data;
1436 struct serial_state *state;
1437 unsigned long flags;
1438
1439 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1440 return;
1441
1442 state = info->state;
1443
1444 local_irq_save(flags);
1445
1446 if (tty_hung_up_p(filp)) {
1447 DBG_CNT("before DEC-hung");
1448 local_irq_restore(flags);
1449 return;
1450 }
1451
1452#ifdef SERIAL_DEBUG_OPEN
1453 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1454#endif
1455 if ((tty->count == 1) && (state->count != 1)) {
1456 /*
1457 * Uh, oh. tty->count is 1, which means that the tty
1458 * structure will be freed. state->count should always
1459 * be one in these conditions. If it's greater than
1460 * one, we've got real problems, since it means the
1461 * serial port won't be shutdown.
1462 */
1463 printk("rs_close: bad serial port count; tty->count is 1, "
1464 "state->count is %d\n", state->count);
1465 state->count = 1;
1466 }
1467 if (--state->count < 0) {
1468 printk("rs_close: bad serial port count for ttys%d: %d\n",
1469 info->line, state->count);
1470 state->count = 0;
1471 }
1472 if (state->count) {
1473 DBG_CNT("before DEC-2");
1474 local_irq_restore(flags);
1475 return;
1476 }
1477 info->flags |= ASYNC_CLOSING;
1478 /*
1479 * Now we wait for the transmit buffer to clear; and we notify
1480 * the line discipline to only process XON/XOFF characters.
1481 */
1482 tty->closing = 1;
1483 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1484 tty_wait_until_sent(tty, info->closing_wait);
1485 /*
1486 * At this point we stop accepting input. To do this, we
1487 * disable the receive line status interrupts, and tell the
1488 * interrupt driver to stop checking the data ready bit in the
1489 * line status register.
1490 */
1491 info->read_status_mask &= ~UART_LSR_DR;
1492 if (info->flags & ASYNC_INITIALIZED) {
1493 /* disable receive interrupts */
1494 custom.intena = IF_RBF;
1495 mb();
1496 /* clear any pending receive interrupt */
1497 custom.intreq = IF_RBF;
1498 mb();
1499
1500 /*
1501 * Before we drop DTR, make sure the UART transmitter
1502 * has completely drained; this is especially
1503 * important if there is a transmit FIFO!
1504 */
1505 rs_wait_until_sent(tty, info->timeout);
1506 }
1507 shutdown(info);
1508 if (tty->driver->flush_buffer)
1509 tty->driver->flush_buffer(tty);
1510
1511 tty_ldisc_flush(tty);
1512 tty->closing = 0;
1513 info->event = 0;
1514 info->tty = NULL;
1515 if (info->blocked_open) {
1516 if (info->close_delay) {
1517 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1518 }
1519 wake_up_interruptible(&info->open_wait);
1520 }
1521 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1522 wake_up_interruptible(&info->close_wait);
1523 local_irq_restore(flags);
1524}
1525
1526/*
1527 * rs_wait_until_sent() --- wait until the transmitter is empty
1528 */
1529static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1530{
1531 struct async_struct * info = (struct async_struct *)tty->driver_data;
1532 unsigned long orig_jiffies, char_time;
1533 int lsr;
1534
1535 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1536 return;
1537
1538 if (info->xmit_fifo_size == 0)
1539 return; /* Just in case.... */
1540
1541 orig_jiffies = jiffies;
1542 /*
1543 * Set the check interval to be 1/5 of the estimated time to
1544 * send a single character, and make it at least 1. The check
1545 * interval should also be less than the timeout.
1546 *
1547 * Note: we have to use pretty tight timings here to satisfy
1548 * the NIST-PCTS.
1549 */
1550 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1551 char_time = char_time / 5;
1552 if (char_time == 0)
1553 char_time = 1;
1554 if (timeout)
1555 char_time = min_t(unsigned long, char_time, timeout);
1556 /*
1557 * If the transmitter hasn't cleared in twice the approximate
1558 * amount of time to send the entire FIFO, it probably won't
1559 * ever clear. This assumes the UART isn't doing flow
1560 * control, which is currently the case. Hence, if it ever
1561 * takes longer than info->timeout, this is probably due to a
1562 * UART bug of some kind. So, we clamp the timeout parameter at
1563 * 2*info->timeout.
1564 */
1565 if (!timeout || timeout > 2*info->timeout)
1566 timeout = 2*info->timeout;
1567#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1568 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1569 printk("jiff=%lu...", jiffies);
1570#endif
1571 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1572#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1573 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1574#endif
1575 msleep_interruptible(jiffies_to_msecs(char_time));
1576 if (signal_pending(current))
1577 break;
1578 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1579 break;
1580 }
1581 current->state = TASK_RUNNING;
1582#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1583 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1584#endif
1585}
1586
1587/*
1588 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1589 */
1590static void rs_hangup(struct tty_struct *tty)
1591{
1592 struct async_struct * info = (struct async_struct *)tty->driver_data;
1593 struct serial_state *state = info->state;
1594
1595 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1596 return;
1597
1598 state = info->state;
1599
1600 rs_flush_buffer(tty);
1601 shutdown(info);
1602 info->event = 0;
1603 state->count = 0;
1604 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1605 info->tty = NULL;
1606 wake_up_interruptible(&info->open_wait);
1607}
1608
1609/*
1610 * ------------------------------------------------------------
1611 * rs_open() and friends
1612 * ------------------------------------------------------------
1613 */
1614static int block_til_ready(struct tty_struct *tty, struct file * filp,
1615 struct async_struct *info)
1616{
1617#ifdef DECLARE_WAITQUEUE
1618 DECLARE_WAITQUEUE(wait, current);
1619#else
1620 struct wait_queue wait = { current, NULL };
1621#endif
1622 struct serial_state *state = info->state;
1623 int retval;
1624 int do_clocal = 0, extra_count = 0;
1625 unsigned long flags;
1626
1627 /*
1628 * If the device is in the middle of being closed, then block
1629 * until it's done, and then try again.
1630 */
1631 if (tty_hung_up_p(filp) ||
1632 (info->flags & ASYNC_CLOSING)) {
1633 if (info->flags & ASYNC_CLOSING)
1634 interruptible_sleep_on(&info->close_wait);
1635#ifdef SERIAL_DO_RESTART
1636 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1637 -EAGAIN : -ERESTARTSYS);
1638#else
1639 return -EAGAIN;
1640#endif
1641 }
1642
1643 /*
1644 * If non-blocking mode is set, or the port is not enabled,
1645 * then make the check up front and then exit.
1646 */
1647 if ((filp->f_flags & O_NONBLOCK) ||
1648 (tty->flags & (1 << TTY_IO_ERROR))) {
1649 info->flags |= ASYNC_NORMAL_ACTIVE;
1650 return 0;
1651 }
1652
1653 if (tty->termios->c_cflag & CLOCAL)
1654 do_clocal = 1;
1655
1656 /*
1657 * Block waiting for the carrier detect and the line to become
1658 * free (i.e., not in use by the callout). While we are in
1659 * this loop, state->count is dropped by one, so that
1660 * rs_close() knows when to free things. We restore it upon
1661 * exit, either normal or abnormal.
1662 */
1663 retval = 0;
1664 add_wait_queue(&info->open_wait, &wait);
1665#ifdef SERIAL_DEBUG_OPEN
1666 printk("block_til_ready before block: ttys%d, count = %d\n",
1667 state->line, state->count);
1668#endif
1669 local_irq_save(flags);
1670 if (!tty_hung_up_p(filp)) {
1671 extra_count = 1;
1672 state->count--;
1673 }
1674 local_irq_restore(flags);
1675 info->blocked_open++;
1676 while (1) {
1677 local_irq_save(flags);
1678 if (tty->termios->c_cflag & CBAUD)
1679 rtsdtr_ctrl(SER_DTR|SER_RTS);
1680 local_irq_restore(flags);
1681 set_current_state(TASK_INTERRUPTIBLE);
1682 if (tty_hung_up_p(filp) ||
1683 !(info->flags & ASYNC_INITIALIZED)) {
1684#ifdef SERIAL_DO_RESTART
1685 if (info->flags & ASYNC_HUP_NOTIFY)
1686 retval = -EAGAIN;
1687 else
1688 retval = -ERESTARTSYS;
1689#else
1690 retval = -EAGAIN;
1691#endif
1692 break;
1693 }
1694 if (!(info->flags & ASYNC_CLOSING) &&
1695 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1696 break;
1697 if (signal_pending(current)) {
1698 retval = -ERESTARTSYS;
1699 break;
1700 }
1701#ifdef SERIAL_DEBUG_OPEN
1702 printk("block_til_ready blocking: ttys%d, count = %d\n",
1703 info->line, state->count);
1704#endif
1705 schedule();
1706 }
1707 current->state = TASK_RUNNING;
1708 remove_wait_queue(&info->open_wait, &wait);
1709 if (extra_count)
1710 state->count++;
1711 info->blocked_open--;
1712#ifdef SERIAL_DEBUG_OPEN
1713 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1714 info->line, state->count);
1715#endif
1716 if (retval)
1717 return retval;
1718 info->flags |= ASYNC_NORMAL_ACTIVE;
1719 return 0;
1720}
1721
1722static int get_async_struct(int line, struct async_struct **ret_info)
1723{
1724 struct async_struct *info;
1725 struct serial_state *sstate;
1726
1727 sstate = rs_table + line;
1728 sstate->count++;
1729 if (sstate->info) {
1730 *ret_info = sstate->info;
1731 return 0;
1732 }
1733 info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
1734 if (!info) {
1735 sstate->count--;
1736 return -ENOMEM;
1737 }
1738 memset(info, 0, sizeof(struct async_struct));
1739#ifdef DECLARE_WAITQUEUE
1740 init_waitqueue_head(&info->open_wait);
1741 init_waitqueue_head(&info->close_wait);
1742 init_waitqueue_head(&info->delta_msr_wait);
1743#endif
1744 info->magic = SERIAL_MAGIC;
1745 info->port = sstate->port;
1746 info->flags = sstate->flags;
1747 info->xmit_fifo_size = sstate->xmit_fifo_size;
1748 info->line = line;
1749 tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1750 info->state = sstate;
1751 if (sstate->info) {
1752 kfree(info);
1753 *ret_info = sstate->info;
1754 return 0;
1755 }
1756 *ret_info = sstate->info = info;
1757 return 0;
1758}
1759
1760/*
1761 * This routine is called whenever a serial port is opened. It
1762 * enables interrupts for a serial port, linking in its async structure into
1763 * the IRQ chain. It also performs the serial-specific
1764 * initialization for the tty structure.
1765 */
1766static int rs_open(struct tty_struct *tty, struct file * filp)
1767{
1768 struct async_struct *info;
1769 int retval, line;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770
1771 line = tty->index;
1772 if ((line < 0) || (line >= NR_PORTS)) {
1773 return -ENODEV;
1774 }
1775 retval = get_async_struct(line, &info);
1776 if (retval) {
1777 return retval;
1778 }
1779 tty->driver_data = info;
1780 info->tty = tty;
1781 if (serial_paranoia_check(info, tty->name, "rs_open"))
1782 return -ENODEV;
1783
1784#ifdef SERIAL_DEBUG_OPEN
1785 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1786#endif
1787 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1788
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 /*
1790 * If the port is the middle of closing, bail out now
1791 */
1792 if (tty_hung_up_p(filp) ||
1793 (info->flags & ASYNC_CLOSING)) {
1794 if (info->flags & ASYNC_CLOSING)
1795 interruptible_sleep_on(&info->close_wait);
1796#ifdef SERIAL_DO_RESTART
1797 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1798 -EAGAIN : -ERESTARTSYS);
1799#else
1800 return -EAGAIN;
1801#endif
1802 }
1803
1804 /*
1805 * Start up serial port
1806 */
1807 retval = startup(info);
1808 if (retval) {
1809 return retval;
1810 }
1811
1812 retval = block_til_ready(tty, filp, info);
1813 if (retval) {
1814#ifdef SERIAL_DEBUG_OPEN
1815 printk("rs_open returning after block_til_ready with %d\n",
1816 retval);
1817#endif
1818 return retval;
1819 }
1820
1821#ifdef SERIAL_DEBUG_OPEN
1822 printk("rs_open %s successful...", tty->name);
1823#endif
1824 return 0;
1825}
1826
1827/*
1828 * /proc fs routines....
1829 */
1830
1831static inline int line_info(char *buf, struct serial_state *state)
1832{
1833 struct async_struct *info = state->info, scr_info;
1834 char stat_buf[30], control, status;
1835 int ret;
1836 unsigned long flags;
1837
1838 ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1839
1840 /*
1841 * Figure out the current RS-232 lines
1842 */
1843 if (!info) {
1844 info = &scr_info; /* This is just for serial_{in,out} */
1845
1846 info->magic = SERIAL_MAGIC;
1847 info->flags = state->flags;
1848 info->quot = 0;
1849 info->tty = NULL;
1850 }
1851 local_irq_save(flags);
1852 status = ciab.pra;
1853 control = info ? info->MCR : status;
1854 local_irq_restore(flags);
1855
1856 stat_buf[0] = 0;
1857 stat_buf[1] = 0;
1858 if(!(control & SER_RTS))
1859 strcat(stat_buf, "|RTS");
1860 if(!(status & SER_CTS))
1861 strcat(stat_buf, "|CTS");
1862 if(!(control & SER_DTR))
1863 strcat(stat_buf, "|DTR");
1864 if(!(status & SER_DSR))
1865 strcat(stat_buf, "|DSR");
1866 if(!(status & SER_DCD))
1867 strcat(stat_buf, "|CD");
1868
1869 if (info->quot) {
1870 ret += sprintf(buf+ret, " baud:%d",
1871 state->baud_base / info->quot);
1872 }
1873
1874 ret += sprintf(buf+ret, " tx:%d rx:%d",
1875 state->icount.tx, state->icount.rx);
1876
1877 if (state->icount.frame)
1878 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1879
1880 if (state->icount.parity)
1881 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1882
1883 if (state->icount.brk)
1884 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1885
1886 if (state->icount.overrun)
1887 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1888
1889 /*
1890 * Last thing is the RS-232 status lines
1891 */
1892 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1893 return ret;
1894}
1895
1896static int rs_read_proc(char *page, char **start, off_t off, int count,
1897 int *eof, void *data)
1898{
1899 int len = 0, l;
1900 off_t begin = 0;
1901
1902 len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1903 l = line_info(page + len, &rs_table[0]);
1904 len += l;
1905 if (len+begin > off+count)
1906 goto done;
1907 if (len+begin < off) {
1908 begin += len;
1909 len = 0;
1910 }
1911 *eof = 1;
1912done:
1913 if (off >= len+begin)
1914 return 0;
1915 *start = page + (off-begin);
1916 return ((count < begin+len-off) ? count : begin+len-off);
1917}
1918
1919/*
1920 * ---------------------------------------------------------------------
1921 * rs_init() and friends
1922 *
1923 * rs_init() is called at boot-time to initialize the serial driver.
1924 * ---------------------------------------------------------------------
1925 */
1926
1927/*
1928 * This routine prints out the appropriate serial driver version
1929 * number, and identifies which options were configured into this
1930 * driver.
1931 */
Adrian Bunk41c28ff2006-03-23 03:00:56 -08001932static void show_serial_version(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933{
1934 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1935}
1936
1937
Jeff Dikeb68e31d2006-10-02 02:17:18 -07001938static const struct tty_operations serial_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 .open = rs_open,
1940 .close = rs_close,
1941 .write = rs_write,
1942 .put_char = rs_put_char,
1943 .flush_chars = rs_flush_chars,
1944 .write_room = rs_write_room,
1945 .chars_in_buffer = rs_chars_in_buffer,
1946 .flush_buffer = rs_flush_buffer,
1947 .ioctl = rs_ioctl,
1948 .throttle = rs_throttle,
1949 .unthrottle = rs_unthrottle,
1950 .set_termios = rs_set_termios,
1951 .stop = rs_stop,
1952 .start = rs_start,
1953 .hangup = rs_hangup,
1954 .break_ctl = rs_break,
1955 .send_xchar = rs_send_xchar,
1956 .wait_until_sent = rs_wait_until_sent,
1957 .read_proc = rs_read_proc,
1958 .tiocmget = rs_tiocmget,
1959 .tiocmset = rs_tiocmset,
1960};
1961
1962/*
1963 * The serial driver boot-time initialization code!
1964 */
1965static int __init rs_init(void)
1966{
1967 unsigned long flags;
1968 struct serial_state * state;
1969
1970 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1971 return -ENODEV;
1972
1973 serial_driver = alloc_tty_driver(1);
1974 if (!serial_driver)
1975 return -ENOMEM;
1976
1977 /*
1978 * We request SERDAT and SERPER only, because the serial registers are
1979 * too spreaded over the custom register space
1980 */
1981 if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
1982 return -EBUSY;
1983
1984 IRQ_ports = NULL;
1985
1986 show_serial_version();
1987
1988 /* Initialize the tty_driver structure */
1989
1990 serial_driver->owner = THIS_MODULE;
1991 serial_driver->driver_name = "amiserial";
1992 serial_driver->name = "ttyS";
1993 serial_driver->major = TTY_MAJOR;
1994 serial_driver->minor_start = 64;
1995 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1996 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1997 serial_driver->init_termios = tty_std_termios;
1998 serial_driver->init_termios.c_cflag =
1999 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2000 serial_driver->flags = TTY_DRIVER_REAL_RAW;
2001 tty_set_operations(serial_driver, &serial_ops);
2002
2003 if (tty_register_driver(serial_driver))
2004 panic("Couldn't register serial driver\n");
2005
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
2027 local_irq_save(flags);
2028
2029 /* set ISRs, and then disable the rx interrupts */
2030 request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
Thomas Gleixner0f2ed4c2006-07-01 19:29:33 -07002031 request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032
2033 /* turn off Rx and Tx interrupts */
2034 custom.intena = IF_RBF | IF_TBE;
2035 mb();
2036
2037 /* clear any pending interrupt */
2038 custom.intreq = IF_RBF | IF_TBE;
2039 mb();
2040
2041 local_irq_restore(flags);
2042
2043 /*
2044 * set the appropriate directions for the modem control flags,
2045 * and clear RTS and DTR
2046 */
2047 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2048 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2049
2050 return 0;
2051}
2052
2053static __exit void rs_exit(void)
2054{
2055 int error;
2056 struct async_struct *info = rs_table[0].info;
2057
2058 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2059 tasklet_kill(&info->tlet);
2060 if ((error = tty_unregister_driver(serial_driver)))
2061 printk("SERIAL: failed to unregister serial driver (%d)\n",
2062 error);
2063 put_tty_driver(serial_driver);
2064
2065 if (info) {
2066 rs_table[0].info = NULL;
2067 kfree(info);
2068 }
2069
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2071}
2072
2073module_init(rs_init)
2074module_exit(rs_exit)
2075
2076
2077/*
2078 * ------------------------------------------------------------
2079 * Serial console driver
2080 * ------------------------------------------------------------
2081 */
2082#ifdef CONFIG_SERIAL_CONSOLE
2083
2084static void amiga_serial_putc(char c)
2085{
2086 custom.serdat = (unsigned char)c | 0x100;
2087 while (!(custom.serdatr & 0x2000))
2088 barrier();
2089}
2090
2091/*
2092 * Print a string to the serial port trying not to disturb
2093 * any possible real use of the port...
2094 *
2095 * The console must be locked when we get here.
2096 */
2097static void serial_console_write(struct console *co, const char *s,
2098 unsigned count)
2099{
2100 unsigned short intena = custom.intenar;
2101
2102 custom.intena = IF_TBE;
2103
2104 while (count--) {
2105 if (*s == '\n')
2106 amiga_serial_putc('\r');
2107 amiga_serial_putc(*s++);
2108 }
2109
2110 custom.intena = IF_SETCLR | (intena & IF_TBE);
2111}
2112
2113static struct tty_driver *serial_console_device(struct console *c, int *index)
2114{
2115 *index = 0;
2116 return serial_driver;
2117}
2118
2119static struct console sercons = {
2120 .name = "ttyS",
2121 .write = serial_console_write,
2122 .device = serial_console_device,
2123 .flags = CON_PRINTBUFFER,
2124 .index = -1,
2125};
2126
2127/*
2128 * Register console.
2129 */
2130static int __init amiserial_console_init(void)
2131{
2132 register_console(&sercons);
2133 return 0;
2134}
2135console_initcall(amiserial_console_init);
2136#endif
2137
2138MODULE_LICENSE("GPL");