blob: 6e763e3f5a815565d57e06ab26641c4a6979856d [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) {
Alan Coxdb0ef082007-07-15 23:41:47 -0700741 /* FIXME: Will need updating for new tty in the end */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 info->tty->termios->c_cflag &= ~CBAUD;
743 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
744 baud = tty_get_baud_rate(info->tty);
745 if (!baud)
746 baud = 9600;
747 if (baud == 38400 &&
748 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
749 quot = info->state->custom_divisor;
750 else {
751 if (baud == 134)
752 /* Special case since 134 is really 134.5 */
753 quot = (2*baud_base / 269);
754 else if (baud)
755 quot = baud_base / baud;
756 }
757 }
758 /* As a last resort, if the quotient is zero, default to 9600 bps */
759 if (!quot)
760 quot = baud_base / 9600;
761 info->quot = quot;
762 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
763 info->timeout += HZ/50; /* Add .02 seconds of slop */
764
765 /* CTS flow control flag and modem status interrupts */
766 info->IER &= ~UART_IER_MSI;
767 if (info->flags & ASYNC_HARDPPS_CD)
768 info->IER |= UART_IER_MSI;
769 if (cflag & CRTSCTS) {
770 info->flags |= ASYNC_CTS_FLOW;
771 info->IER |= UART_IER_MSI;
772 } else
773 info->flags &= ~ASYNC_CTS_FLOW;
774 if (cflag & CLOCAL)
775 info->flags &= ~ASYNC_CHECK_CD;
776 else {
777 info->flags |= ASYNC_CHECK_CD;
778 info->IER |= UART_IER_MSI;
779 }
780 /* TBD:
781 * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
782 */
783
784 /*
785 * Set up parity check flag
786 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
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
Alan Cox257afa32008-04-30 00:54:02 -0700835static int rs_put_char(struct tty_struct *tty, unsigned char ch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836{
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)
Alan Cox257afa32008-04-30 00:54:02 -0700841 return 0;
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700842
843 info = tty->driver_data;
844
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
Alan Cox257afa32008-04-30 00:54:02 -0700846 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700848 if (!info->xmit.buf)
Alan Cox257afa32008-04-30 00:54:02 -0700849 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
851 local_irq_save(flags);
852 if (CIRC_SPACE(info->xmit.head,
853 info->xmit.tail,
854 SERIAL_XMIT_SIZE) == 0) {
855 local_irq_restore(flags);
Alan Cox257afa32008-04-30 00:54:02 -0700856 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 }
858
859 info->xmit.buf[info->xmit.head++] = ch;
860 info->xmit.head &= SERIAL_XMIT_SIZE-1;
861 local_irq_restore(flags);
Alan Cox257afa32008-04-30 00:54:02 -0700862 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863}
864
865static void rs_flush_chars(struct tty_struct *tty)
866{
867 struct async_struct *info = (struct async_struct *)tty->driver_data;
868 unsigned long flags;
869
870 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
871 return;
872
873 if (info->xmit.head == info->xmit.tail
874 || tty->stopped
875 || tty->hw_stopped
876 || !info->xmit.buf)
877 return;
878
879 local_irq_save(flags);
880 info->IER |= UART_IER_THRI;
881 custom.intena = IF_SETCLR | IF_TBE;
882 mb();
883 /* set a pending Tx Interrupt, transmitter should restart now */
884 custom.intreq = IF_SETCLR | IF_TBE;
885 mb();
886 local_irq_restore(flags);
887}
888
889static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
890{
891 int c, ret = 0;
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700892 struct async_struct *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 unsigned long flags;
894
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700895 if (!tty)
896 return 0;
897
898 info = tty->driver_data;
899
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 if (serial_paranoia_check(info, tty->name, "rs_write"))
901 return 0;
902
Jiri Slabyb3218a72006-10-04 02:15:27 -0700903 if (!info->xmit.buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 return 0;
905
Jiri Kosina3abf3be2007-02-10 01:46:48 -0800906 local_irq_save(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 while (1) {
908 c = CIRC_SPACE_TO_END(info->xmit.head,
909 info->xmit.tail,
910 SERIAL_XMIT_SIZE);
911 if (count < c)
912 c = count;
913 if (c <= 0) {
914 break;
915 }
916 memcpy(info->xmit.buf + info->xmit.head, buf, c);
917 info->xmit.head = ((info->xmit.head + c) &
918 (SERIAL_XMIT_SIZE-1));
919 buf += c;
920 count -= c;
921 ret += c;
922 }
923 local_irq_restore(flags);
924
925 if (info->xmit.head != info->xmit.tail
926 && !tty->stopped
927 && !tty->hw_stopped
928 && !(info->IER & UART_IER_THRI)) {
929 info->IER |= UART_IER_THRI;
930 local_irq_disable();
931 custom.intena = IF_SETCLR | IF_TBE;
932 mb();
933 /* set a pending Tx Interrupt, transmitter should restart now */
934 custom.intreq = IF_SETCLR | IF_TBE;
935 mb();
936 local_irq_restore(flags);
937 }
938 return ret;
939}
940
941static int rs_write_room(struct tty_struct *tty)
942{
943 struct async_struct *info = (struct async_struct *)tty->driver_data;
944
945 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
946 return 0;
947 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
948}
949
950static int rs_chars_in_buffer(struct tty_struct *tty)
951{
952 struct async_struct *info = (struct async_struct *)tty->driver_data;
953
954 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
955 return 0;
956 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
957}
958
959static void rs_flush_buffer(struct tty_struct *tty)
960{
961 struct async_struct *info = (struct async_struct *)tty->driver_data;
962 unsigned long flags;
963
964 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
965 return;
966 local_irq_save(flags);
967 info->xmit.head = info->xmit.tail = 0;
968 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 tty_wakeup(tty);
970}
971
972/*
973 * This function is used to send a high-priority XON/XOFF character to
974 * the device
975 */
976static void rs_send_xchar(struct tty_struct *tty, char ch)
977{
978 struct async_struct *info = (struct async_struct *)tty->driver_data;
979 unsigned long flags;
980
981 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
982 return;
983
984 info->x_char = ch;
985 if (ch) {
986 /* Make sure transmit interrupts are on */
987
988 /* Check this ! */
989 local_irq_save(flags);
990 if(!(custom.intenar & IF_TBE)) {
991 custom.intena = IF_SETCLR | IF_TBE;
992 mb();
993 /* set a pending Tx Interrupt, transmitter should restart now */
994 custom.intreq = IF_SETCLR | IF_TBE;
995 mb();
996 }
997 local_irq_restore(flags);
998
999 info->IER |= UART_IER_THRI;
1000 }
1001}
1002
1003/*
1004 * ------------------------------------------------------------
1005 * rs_throttle()
1006 *
1007 * This routine is called by the upper-layer tty layer to signal that
1008 * incoming characters should be throttled.
1009 * ------------------------------------------------------------
1010 */
1011static void rs_throttle(struct tty_struct * tty)
1012{
1013 struct async_struct *info = (struct async_struct *)tty->driver_data;
1014 unsigned long flags;
1015#ifdef SERIAL_DEBUG_THROTTLE
1016 char buf[64];
1017
1018 printk("throttle %s: %d....\n", tty_name(tty, buf),
1019 tty->ldisc.chars_in_buffer(tty));
1020#endif
1021
1022 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1023 return;
1024
1025 if (I_IXOFF(tty))
1026 rs_send_xchar(tty, STOP_CHAR(tty));
1027
1028 if (tty->termios->c_cflag & CRTSCTS)
1029 info->MCR &= ~SER_RTS;
1030
1031 local_irq_save(flags);
1032 rtsdtr_ctrl(info->MCR);
1033 local_irq_restore(flags);
1034}
1035
1036static void rs_unthrottle(struct tty_struct * tty)
1037{
1038 struct async_struct *info = (struct async_struct *)tty->driver_data;
1039 unsigned long flags;
1040#ifdef SERIAL_DEBUG_THROTTLE
1041 char buf[64];
1042
1043 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1044 tty->ldisc.chars_in_buffer(tty));
1045#endif
1046
1047 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1048 return;
1049
1050 if (I_IXOFF(tty)) {
1051 if (info->x_char)
1052 info->x_char = 0;
1053 else
1054 rs_send_xchar(tty, START_CHAR(tty));
1055 }
1056 if (tty->termios->c_cflag & CRTSCTS)
1057 info->MCR |= SER_RTS;
1058 local_irq_save(flags);
1059 rtsdtr_ctrl(info->MCR);
1060 local_irq_restore(flags);
1061}
1062
1063/*
1064 * ------------------------------------------------------------
1065 * rs_ioctl() and friends
1066 * ------------------------------------------------------------
1067 */
1068
1069static int get_serial_info(struct async_struct * info,
Al Viroab14cae2006-01-12 01:06:30 -08001070 struct serial_struct __user * retinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071{
1072 struct serial_struct tmp;
1073 struct serial_state *state = info->state;
1074
1075 if (!retinfo)
1076 return -EFAULT;
1077 memset(&tmp, 0, sizeof(tmp));
Alan Coxe18ce492008-04-30 00:53:16 -07001078 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 tmp.type = state->type;
1080 tmp.line = state->line;
1081 tmp.port = state->port;
1082 tmp.irq = state->irq;
1083 tmp.flags = state->flags;
1084 tmp.xmit_fifo_size = state->xmit_fifo_size;
1085 tmp.baud_base = state->baud_base;
1086 tmp.close_delay = state->close_delay;
1087 tmp.closing_wait = state->closing_wait;
1088 tmp.custom_divisor = state->custom_divisor;
Alan Coxe18ce492008-04-30 00:53:16 -07001089 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1091 return -EFAULT;
1092 return 0;
1093}
1094
1095static int set_serial_info(struct async_struct * info,
Al Viroab14cae2006-01-12 01:06:30 -08001096 struct serial_struct __user * new_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097{
1098 struct serial_struct new_serial;
1099 struct serial_state old_state, *state;
1100 unsigned int change_irq,change_port;
1101 int retval = 0;
1102
1103 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1104 return -EFAULT;
Alan Coxe18ce492008-04-30 00:53:16 -07001105
1106 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 state = info->state;
1108 old_state = *state;
1109
1110 change_irq = new_serial.irq != state->irq;
1111 change_port = (new_serial.port != state->port);
Alan Coxe18ce492008-04-30 00:53:16 -07001112 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1113 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 return -EINVAL;
Alan Coxe18ce492008-04-30 00:53:16 -07001115 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116
1117 if (!serial_isroot()) {
1118 if ((new_serial.baud_base != state->baud_base) ||
1119 (new_serial.close_delay != state->close_delay) ||
1120 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1121 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1122 (state->flags & ~ASYNC_USR_MASK)))
1123 return -EPERM;
1124 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1125 (new_serial.flags & ASYNC_USR_MASK));
1126 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1127 (new_serial.flags & ASYNC_USR_MASK));
1128 state->custom_divisor = new_serial.custom_divisor;
1129 goto check_and_exit;
1130 }
1131
Alan Coxe18ce492008-04-30 00:53:16 -07001132 if (new_serial.baud_base < 9600) {
1133 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 return -EINVAL;
Alan Coxe18ce492008-04-30 00:53:16 -07001135 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136
1137 /*
1138 * OK, past this point, all the error checking has been done.
1139 * At this point, we start making changes.....
1140 */
1141
1142 state->baud_base = new_serial.baud_base;
1143 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1144 (new_serial.flags & ASYNC_FLAGS));
1145 info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1146 (info->flags & ASYNC_INTERNAL_FLAGS));
1147 state->custom_divisor = new_serial.custom_divisor;
1148 state->close_delay = new_serial.close_delay * HZ/100;
1149 state->closing_wait = new_serial.closing_wait * HZ/100;
1150 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1151
1152check_and_exit:
1153 if (info->flags & ASYNC_INITIALIZED) {
1154 if (((old_state.flags & ASYNC_SPD_MASK) !=
1155 (state->flags & ASYNC_SPD_MASK)) ||
1156 (old_state.custom_divisor != state->custom_divisor)) {
1157 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1158 info->tty->alt_speed = 57600;
1159 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1160 info->tty->alt_speed = 115200;
1161 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1162 info->tty->alt_speed = 230400;
1163 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1164 info->tty->alt_speed = 460800;
1165 change_speed(info, NULL);
1166 }
1167 } else
1168 retval = startup(info);
Alan Coxe18ce492008-04-30 00:53:16 -07001169 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 return retval;
1171}
1172
1173
1174/*
1175 * get_lsr_info - get line status register info
1176 *
1177 * Purpose: Let user call ioctl() to get info when the UART physically
1178 * is emptied. On bus types like RS485, the transmitter must
1179 * release the bus after transmitting. This must be done when
1180 * the transmit shift register is empty, not be done when the
1181 * transmit holding register is empty. This functionality
1182 * allows an RS485 driver to be written in user space.
1183 */
Al Viroab14cae2006-01-12 01:06:30 -08001184static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185{
1186 unsigned char status;
1187 unsigned int result;
1188 unsigned long flags;
1189
1190 local_irq_save(flags);
1191 status = custom.serdatr;
1192 mb();
1193 local_irq_restore(flags);
1194 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1195 if (copy_to_user(value, &result, sizeof(int)))
1196 return -EFAULT;
1197 return 0;
1198}
1199
1200
1201static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1202{
1203 struct async_struct * info = (struct async_struct *)tty->driver_data;
1204 unsigned char control, status;
1205 unsigned long flags;
1206
1207 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1208 return -ENODEV;
1209 if (tty->flags & (1 << TTY_IO_ERROR))
1210 return -EIO;
1211
1212 control = info->MCR;
1213 local_irq_save(flags);
1214 status = ciab.pra;
1215 local_irq_restore(flags);
1216 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1217 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1218 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1219 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1220 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1221}
1222
1223static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1224 unsigned int set, unsigned int clear)
1225{
1226 struct async_struct * info = (struct async_struct *)tty->driver_data;
1227 unsigned long flags;
1228
1229 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1230 return -ENODEV;
1231 if (tty->flags & (1 << TTY_IO_ERROR))
1232 return -EIO;
1233
1234 local_irq_save(flags);
1235 if (set & TIOCM_RTS)
1236 info->MCR |= SER_RTS;
1237 if (set & TIOCM_DTR)
1238 info->MCR |= SER_DTR;
1239 if (clear & TIOCM_RTS)
1240 info->MCR &= ~SER_RTS;
1241 if (clear & TIOCM_DTR)
1242 info->MCR &= ~SER_DTR;
1243 rtsdtr_ctrl(info->MCR);
1244 local_irq_restore(flags);
1245 return 0;
1246}
1247
1248/*
1249 * rs_break() --- routine which turns the break handling on or off
1250 */
Alan Cox9e989662008-07-22 11:18:03 +01001251static int rs_break(struct tty_struct *tty, int break_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252{
1253 struct async_struct * info = (struct async_struct *)tty->driver_data;
1254 unsigned long flags;
1255
1256 if (serial_paranoia_check(info, tty->name, "rs_break"))
Geert Uytterhoeven970a8a52008-08-06 22:19:39 +02001257 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258
1259 local_irq_save(flags);
1260 if (break_state == -1)
1261 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1262 else
1263 custom.adkcon = AC_UARTBRK;
1264 mb();
1265 local_irq_restore(flags);
Alan Cox9e989662008-07-22 11:18:03 +01001266 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267}
1268
1269
1270static int rs_ioctl(struct tty_struct *tty, struct file * file,
1271 unsigned int cmd, unsigned long arg)
1272{
1273 struct async_struct * info = (struct async_struct *)tty->driver_data;
1274 struct async_icount cprev, cnow; /* kernel counter temps */
1275 struct serial_icounter_struct icount;
Al Viroab14cae2006-01-12 01:06:30 -08001276 void __user *argp = (void __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 unsigned long flags;
1278
1279 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1280 return -ENODEV;
1281
1282 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1283 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1284 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1285 if (tty->flags & (1 << TTY_IO_ERROR))
1286 return -EIO;
1287 }
1288
1289 switch (cmd) {
1290 case TIOCGSERIAL:
Al Viroab14cae2006-01-12 01:06:30 -08001291 return get_serial_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 case TIOCSSERIAL:
Al Viroab14cae2006-01-12 01:06:30 -08001293 return set_serial_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 case TIOCSERCONFIG:
1295 return 0;
1296
1297 case TIOCSERGETLSR: /* Get line status register */
Al Viroab14cae2006-01-12 01:06:30 -08001298 return get_lsr_info(info, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299
1300 case TIOCSERGSTRUCT:
Al Viroab14cae2006-01-12 01:06:30 -08001301 if (copy_to_user(argp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 info, sizeof(struct async_struct)))
1303 return -EFAULT;
1304 return 0;
1305
1306 /*
1307 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1308 * - mask passed in arg for lines of interest
1309 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1310 * Caller should use TIOCGICOUNT to see which one it was
1311 */
1312 case TIOCMIWAIT:
1313 local_irq_save(flags);
1314 /* note the counters on entry */
1315 cprev = info->state->icount;
1316 local_irq_restore(flags);
1317 while (1) {
1318 interruptible_sleep_on(&info->delta_msr_wait);
1319 /* see if a signal did it */
1320 if (signal_pending(current))
1321 return -ERESTARTSYS;
1322 local_irq_save(flags);
1323 cnow = info->state->icount; /* atomic copy */
1324 local_irq_restore(flags);
1325 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1326 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1327 return -EIO; /* no change => error */
1328 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1329 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1330 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1331 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1332 return 0;
1333 }
1334 cprev = cnow;
1335 }
1336 /* NOTREACHED */
1337
1338 /*
1339 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1340 * Return: write counters to the user passed counter struct
1341 * NB: both 1->0 and 0->1 transitions are counted except for
1342 * RI where only 0->1 is counted.
1343 */
1344 case TIOCGICOUNT:
1345 local_irq_save(flags);
1346 cnow = info->state->icount;
1347 local_irq_restore(flags);
1348 icount.cts = cnow.cts;
1349 icount.dsr = cnow.dsr;
1350 icount.rng = cnow.rng;
1351 icount.dcd = cnow.dcd;
1352 icount.rx = cnow.rx;
1353 icount.tx = cnow.tx;
1354 icount.frame = cnow.frame;
1355 icount.overrun = cnow.overrun;
1356 icount.parity = cnow.parity;
1357 icount.brk = cnow.brk;
1358 icount.buf_overrun = cnow.buf_overrun;
1359
Al Viroab14cae2006-01-12 01:06:30 -08001360 if (copy_to_user(argp, &icount, sizeof(icount)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 return -EFAULT;
1362 return 0;
1363 case TIOCSERGWILD:
1364 case TIOCSERSWILD:
1365 /* "setserial -W" is called in Debian boot */
1366 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1367 return 0;
1368
1369 default:
1370 return -ENOIOCTLCMD;
1371 }
1372 return 0;
1373}
1374
Alan Cox606d0992006-12-08 02:38:45 -08001375static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376{
1377 struct async_struct *info = (struct async_struct *)tty->driver_data;
1378 unsigned long flags;
1379 unsigned int cflag = tty->termios->c_cflag;
1380
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 change_speed(info, old_termios);
1382
1383 /* Handle transition to B0 status */
1384 if ((old_termios->c_cflag & CBAUD) &&
1385 !(cflag & CBAUD)) {
1386 info->MCR &= ~(SER_DTR|SER_RTS);
1387 local_irq_save(flags);
1388 rtsdtr_ctrl(info->MCR);
1389 local_irq_restore(flags);
1390 }
1391
1392 /* Handle transition away from B0 status */
1393 if (!(old_termios->c_cflag & CBAUD) &&
1394 (cflag & CBAUD)) {
1395 info->MCR |= SER_DTR;
1396 if (!(tty->termios->c_cflag & CRTSCTS) ||
1397 !test_bit(TTY_THROTTLED, &tty->flags)) {
1398 info->MCR |= SER_RTS;
1399 }
1400 local_irq_save(flags);
1401 rtsdtr_ctrl(info->MCR);
1402 local_irq_restore(flags);
1403 }
1404
1405 /* Handle turning off CRTSCTS */
1406 if ((old_termios->c_cflag & CRTSCTS) &&
1407 !(tty->termios->c_cflag & CRTSCTS)) {
1408 tty->hw_stopped = 0;
1409 rs_start(tty);
1410 }
1411
1412#if 0
1413 /*
1414 * No need to wake up processes in open wait, since they
1415 * sample the CLOCAL flag once, and don't recheck it.
1416 * XXX It's not clear whether the current behavior is correct
1417 * or not. Hence, this may change.....
1418 */
1419 if (!(old_termios->c_cflag & CLOCAL) &&
1420 (tty->termios->c_cflag & CLOCAL))
1421 wake_up_interruptible(&info->open_wait);
1422#endif
1423}
1424
1425/*
1426 * ------------------------------------------------------------
1427 * rs_close()
1428 *
1429 * This routine is called when the serial port gets closed. First, we
1430 * wait for the last remaining data to be sent. Then, we unlink its
1431 * async structure from the interrupt chain if necessary, and we free
1432 * that IRQ if nothing is left in the chain.
1433 * ------------------------------------------------------------
1434 */
1435static void rs_close(struct tty_struct *tty, struct file * filp)
1436{
1437 struct async_struct * info = (struct async_struct *)tty->driver_data;
1438 struct serial_state *state;
1439 unsigned long flags;
1440
1441 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1442 return;
1443
1444 state = info->state;
1445
1446 local_irq_save(flags);
1447
1448 if (tty_hung_up_p(filp)) {
1449 DBG_CNT("before DEC-hung");
1450 local_irq_restore(flags);
1451 return;
1452 }
1453
1454#ifdef SERIAL_DEBUG_OPEN
1455 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1456#endif
1457 if ((tty->count == 1) && (state->count != 1)) {
1458 /*
1459 * Uh, oh. tty->count is 1, which means that the tty
1460 * structure will be freed. state->count should always
1461 * be one in these conditions. If it's greater than
1462 * one, we've got real problems, since it means the
1463 * serial port won't be shutdown.
1464 */
1465 printk("rs_close: bad serial port count; tty->count is 1, "
1466 "state->count is %d\n", state->count);
1467 state->count = 1;
1468 }
1469 if (--state->count < 0) {
1470 printk("rs_close: bad serial port count for ttys%d: %d\n",
1471 info->line, state->count);
1472 state->count = 0;
1473 }
1474 if (state->count) {
1475 DBG_CNT("before DEC-2");
1476 local_irq_restore(flags);
1477 return;
1478 }
1479 info->flags |= ASYNC_CLOSING;
1480 /*
1481 * Now we wait for the transmit buffer to clear; and we notify
1482 * the line discipline to only process XON/XOFF characters.
1483 */
1484 tty->closing = 1;
1485 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1486 tty_wait_until_sent(tty, info->closing_wait);
1487 /*
1488 * At this point we stop accepting input. To do this, we
1489 * disable the receive line status interrupts, and tell the
1490 * interrupt driver to stop checking the data ready bit in the
1491 * line status register.
1492 */
1493 info->read_status_mask &= ~UART_LSR_DR;
1494 if (info->flags & ASYNC_INITIALIZED) {
1495 /* disable receive interrupts */
1496 custom.intena = IF_RBF;
1497 mb();
1498 /* clear any pending receive interrupt */
1499 custom.intreq = IF_RBF;
1500 mb();
1501
1502 /*
1503 * Before we drop DTR, make sure the UART transmitter
1504 * has completely drained; this is especially
1505 * important if there is a transmit FIFO!
1506 */
1507 rs_wait_until_sent(tty, info->timeout);
1508 }
1509 shutdown(info);
Alan Cox978e5952008-04-30 00:53:59 -07001510 rs_flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
1512 tty_ldisc_flush(tty);
1513 tty->closing = 0;
1514 info->event = 0;
1515 info->tty = NULL;
1516 if (info->blocked_open) {
1517 if (info->close_delay) {
1518 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1519 }
1520 wake_up_interruptible(&info->open_wait);
1521 }
1522 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1523 wake_up_interruptible(&info->close_wait);
1524 local_irq_restore(flags);
1525}
1526
1527/*
1528 * rs_wait_until_sent() --- wait until the transmitter is empty
1529 */
1530static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1531{
1532 struct async_struct * info = (struct async_struct *)tty->driver_data;
1533 unsigned long orig_jiffies, char_time;
1534 int lsr;
1535
1536 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1537 return;
1538
1539 if (info->xmit_fifo_size == 0)
1540 return; /* Just in case.... */
1541
1542 orig_jiffies = jiffies;
Alan Cox978e5952008-04-30 00:53:59 -07001543
1544 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 /*
1546 * Set the check interval to be 1/5 of the estimated time to
1547 * send a single character, and make it at least 1. The check
1548 * interval should also be less than the timeout.
1549 *
1550 * Note: we have to use pretty tight timings here to satisfy
1551 * the NIST-PCTS.
1552 */
1553 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1554 char_time = char_time / 5;
1555 if (char_time == 0)
1556 char_time = 1;
1557 if (timeout)
1558 char_time = min_t(unsigned long, char_time, timeout);
1559 /*
1560 * If the transmitter hasn't cleared in twice the approximate
1561 * amount of time to send the entire FIFO, it probably won't
1562 * ever clear. This assumes the UART isn't doing flow
1563 * control, which is currently the case. Hence, if it ever
1564 * takes longer than info->timeout, this is probably due to a
1565 * UART bug of some kind. So, we clamp the timeout parameter at
1566 * 2*info->timeout.
1567 */
1568 if (!timeout || timeout > 2*info->timeout)
1569 timeout = 2*info->timeout;
1570#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1571 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1572 printk("jiff=%lu...", jiffies);
1573#endif
1574 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1575#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1576 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1577#endif
1578 msleep_interruptible(jiffies_to_msecs(char_time));
1579 if (signal_pending(current))
1580 break;
1581 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1582 break;
1583 }
Milind Arun Choudharycc0a8fb2007-05-08 00:30:52 -07001584 __set_current_state(TASK_RUNNING);
Alan Cox978e5952008-04-30 00:53:59 -07001585 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1587 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1588#endif
1589}
1590
1591/*
1592 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1593 */
1594static void rs_hangup(struct tty_struct *tty)
1595{
1596 struct async_struct * info = (struct async_struct *)tty->driver_data;
1597 struct serial_state *state = info->state;
1598
1599 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1600 return;
1601
1602 state = info->state;
1603
1604 rs_flush_buffer(tty);
1605 shutdown(info);
1606 info->event = 0;
1607 state->count = 0;
1608 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1609 info->tty = NULL;
1610 wake_up_interruptible(&info->open_wait);
1611}
1612
1613/*
1614 * ------------------------------------------------------------
1615 * rs_open() and friends
1616 * ------------------------------------------------------------
1617 */
1618static int block_til_ready(struct tty_struct *tty, struct file * filp,
1619 struct async_struct *info)
1620{
1621#ifdef DECLARE_WAITQUEUE
1622 DECLARE_WAITQUEUE(wait, current);
1623#else
1624 struct wait_queue wait = { current, NULL };
1625#endif
1626 struct serial_state *state = info->state;
1627 int retval;
1628 int do_clocal = 0, extra_count = 0;
1629 unsigned long flags;
1630
1631 /*
1632 * If the device is in the middle of being closed, then block
1633 * until it's done, and then try again.
1634 */
1635 if (tty_hung_up_p(filp) ||
1636 (info->flags & ASYNC_CLOSING)) {
1637 if (info->flags & ASYNC_CLOSING)
1638 interruptible_sleep_on(&info->close_wait);
1639#ifdef SERIAL_DO_RESTART
1640 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1641 -EAGAIN : -ERESTARTSYS);
1642#else
1643 return -EAGAIN;
1644#endif
1645 }
1646
1647 /*
1648 * If non-blocking mode is set, or the port is not enabled,
1649 * then make the check up front and then exit.
1650 */
1651 if ((filp->f_flags & O_NONBLOCK) ||
1652 (tty->flags & (1 << TTY_IO_ERROR))) {
1653 info->flags |= ASYNC_NORMAL_ACTIVE;
1654 return 0;
1655 }
1656
1657 if (tty->termios->c_cflag & CLOCAL)
1658 do_clocal = 1;
1659
1660 /*
1661 * Block waiting for the carrier detect and the line to become
1662 * free (i.e., not in use by the callout). While we are in
1663 * this loop, state->count is dropped by one, so that
1664 * rs_close() knows when to free things. We restore it upon
1665 * exit, either normal or abnormal.
1666 */
1667 retval = 0;
1668 add_wait_queue(&info->open_wait, &wait);
1669#ifdef SERIAL_DEBUG_OPEN
1670 printk("block_til_ready before block: ttys%d, count = %d\n",
1671 state->line, state->count);
1672#endif
1673 local_irq_save(flags);
1674 if (!tty_hung_up_p(filp)) {
1675 extra_count = 1;
1676 state->count--;
1677 }
1678 local_irq_restore(flags);
1679 info->blocked_open++;
1680 while (1) {
1681 local_irq_save(flags);
1682 if (tty->termios->c_cflag & CBAUD)
1683 rtsdtr_ctrl(SER_DTR|SER_RTS);
1684 local_irq_restore(flags);
1685 set_current_state(TASK_INTERRUPTIBLE);
1686 if (tty_hung_up_p(filp) ||
1687 !(info->flags & ASYNC_INITIALIZED)) {
1688#ifdef SERIAL_DO_RESTART
1689 if (info->flags & ASYNC_HUP_NOTIFY)
1690 retval = -EAGAIN;
1691 else
1692 retval = -ERESTARTSYS;
1693#else
1694 retval = -EAGAIN;
1695#endif
1696 break;
1697 }
1698 if (!(info->flags & ASYNC_CLOSING) &&
1699 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1700 break;
1701 if (signal_pending(current)) {
1702 retval = -ERESTARTSYS;
1703 break;
1704 }
1705#ifdef SERIAL_DEBUG_OPEN
1706 printk("block_til_ready blocking: ttys%d, count = %d\n",
1707 info->line, state->count);
1708#endif
1709 schedule();
1710 }
Milind Arun Choudharycc0a8fb2007-05-08 00:30:52 -07001711 __set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 remove_wait_queue(&info->open_wait, &wait);
1713 if (extra_count)
1714 state->count++;
1715 info->blocked_open--;
1716#ifdef SERIAL_DEBUG_OPEN
1717 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1718 info->line, state->count);
1719#endif
1720 if (retval)
1721 return retval;
1722 info->flags |= ASYNC_NORMAL_ACTIVE;
1723 return 0;
1724}
1725
1726static int get_async_struct(int line, struct async_struct **ret_info)
1727{
1728 struct async_struct *info;
1729 struct serial_state *sstate;
1730
1731 sstate = rs_table + line;
1732 sstate->count++;
1733 if (sstate->info) {
1734 *ret_info = sstate->info;
1735 return 0;
1736 }
Yoann Padioleaudd00cc42007-07-19 01:49:03 -07001737 info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 if (!info) {
1739 sstate->count--;
1740 return -ENOMEM;
1741 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742#ifdef DECLARE_WAITQUEUE
1743 init_waitqueue_head(&info->open_wait);
1744 init_waitqueue_head(&info->close_wait);
1745 init_waitqueue_head(&info->delta_msr_wait);
1746#endif
1747 info->magic = SERIAL_MAGIC;
1748 info->port = sstate->port;
1749 info->flags = sstate->flags;
1750 info->xmit_fifo_size = sstate->xmit_fifo_size;
1751 info->line = line;
1752 tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1753 info->state = sstate;
1754 if (sstate->info) {
1755 kfree(info);
1756 *ret_info = sstate->info;
1757 return 0;
1758 }
1759 *ret_info = sstate->info = info;
1760 return 0;
1761}
1762
1763/*
1764 * This routine is called whenever a serial port is opened. It
1765 * enables interrupts for a serial port, linking in its async structure into
1766 * the IRQ chain. It also performs the serial-specific
1767 * initialization for the tty structure.
1768 */
1769static int rs_open(struct tty_struct *tty, struct file * filp)
1770{
1771 struct async_struct *info;
1772 int retval, line;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773
1774 line = tty->index;
1775 if ((line < 0) || (line >= NR_PORTS)) {
1776 return -ENODEV;
1777 }
1778 retval = get_async_struct(line, &info);
1779 if (retval) {
1780 return retval;
1781 }
1782 tty->driver_data = info;
1783 info->tty = tty;
1784 if (serial_paranoia_check(info, tty->name, "rs_open"))
1785 return -ENODEV;
1786
1787#ifdef SERIAL_DEBUG_OPEN
1788 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1789#endif
1790 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1791
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 /*
1793 * If the port is the middle of closing, bail out now
1794 */
1795 if (tty_hung_up_p(filp) ||
1796 (info->flags & ASYNC_CLOSING)) {
1797 if (info->flags & ASYNC_CLOSING)
1798 interruptible_sleep_on(&info->close_wait);
1799#ifdef SERIAL_DO_RESTART
1800 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1801 -EAGAIN : -ERESTARTSYS);
1802#else
1803 return -EAGAIN;
1804#endif
1805 }
1806
1807 /*
1808 * Start up serial port
1809 */
1810 retval = startup(info);
1811 if (retval) {
1812 return retval;
1813 }
1814
1815 retval = block_til_ready(tty, filp, info);
1816 if (retval) {
1817#ifdef SERIAL_DEBUG_OPEN
1818 printk("rs_open returning after block_til_ready with %d\n",
1819 retval);
1820#endif
1821 return retval;
1822 }
1823
1824#ifdef SERIAL_DEBUG_OPEN
1825 printk("rs_open %s successful...", tty->name);
1826#endif
1827 return 0;
1828}
1829
1830/*
1831 * /proc fs routines....
1832 */
1833
1834static inline int line_info(char *buf, struct serial_state *state)
1835{
1836 struct async_struct *info = state->info, scr_info;
1837 char stat_buf[30], control, status;
1838 int ret;
1839 unsigned long flags;
1840
1841 ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1842
1843 /*
1844 * Figure out the current RS-232 lines
1845 */
1846 if (!info) {
1847 info = &scr_info; /* This is just for serial_{in,out} */
1848
1849 info->magic = SERIAL_MAGIC;
1850 info->flags = state->flags;
1851 info->quot = 0;
1852 info->tty = NULL;
1853 }
1854 local_irq_save(flags);
1855 status = ciab.pra;
1856 control = info ? info->MCR : status;
1857 local_irq_restore(flags);
1858
1859 stat_buf[0] = 0;
1860 stat_buf[1] = 0;
1861 if(!(control & SER_RTS))
1862 strcat(stat_buf, "|RTS");
1863 if(!(status & SER_CTS))
1864 strcat(stat_buf, "|CTS");
1865 if(!(control & SER_DTR))
1866 strcat(stat_buf, "|DTR");
1867 if(!(status & SER_DSR))
1868 strcat(stat_buf, "|DSR");
1869 if(!(status & SER_DCD))
1870 strcat(stat_buf, "|CD");
1871
1872 if (info->quot) {
1873 ret += sprintf(buf+ret, " baud:%d",
1874 state->baud_base / info->quot);
1875 }
1876
1877 ret += sprintf(buf+ret, " tx:%d rx:%d",
1878 state->icount.tx, state->icount.rx);
1879
1880 if (state->icount.frame)
1881 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1882
1883 if (state->icount.parity)
1884 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1885
1886 if (state->icount.brk)
1887 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1888
1889 if (state->icount.overrun)
1890 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1891
1892 /*
1893 * Last thing is the RS-232 status lines
1894 */
1895 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1896 return ret;
1897}
1898
1899static int rs_read_proc(char *page, char **start, off_t off, int count,
1900 int *eof, void *data)
1901{
1902 int len = 0, l;
1903 off_t begin = 0;
1904
1905 len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1906 l = line_info(page + len, &rs_table[0]);
1907 len += l;
1908 if (len+begin > off+count)
1909 goto done;
1910 if (len+begin < off) {
1911 begin += len;
1912 len = 0;
1913 }
1914 *eof = 1;
1915done:
1916 if (off >= len+begin)
1917 return 0;
1918 *start = page + (off-begin);
1919 return ((count < begin+len-off) ? count : begin+len-off);
1920}
1921
1922/*
1923 * ---------------------------------------------------------------------
1924 * rs_init() and friends
1925 *
1926 * rs_init() is called at boot-time to initialize the serial driver.
1927 * ---------------------------------------------------------------------
1928 */
1929
1930/*
1931 * This routine prints out the appropriate serial driver version
1932 * number, and identifies which options were configured into this
1933 * driver.
1934 */
Adrian Bunk41c28ff2006-03-23 03:00:56 -08001935static void show_serial_version(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936{
1937 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1938}
1939
1940
Jeff Dikeb68e31d2006-10-02 02:17:18 -07001941static const struct tty_operations serial_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942 .open = rs_open,
1943 .close = rs_close,
1944 .write = rs_write,
1945 .put_char = rs_put_char,
1946 .flush_chars = rs_flush_chars,
1947 .write_room = rs_write_room,
1948 .chars_in_buffer = rs_chars_in_buffer,
1949 .flush_buffer = rs_flush_buffer,
1950 .ioctl = rs_ioctl,
1951 .throttle = rs_throttle,
1952 .unthrottle = rs_unthrottle,
1953 .set_termios = rs_set_termios,
1954 .stop = rs_stop,
1955 .start = rs_start,
1956 .hangup = rs_hangup,
1957 .break_ctl = rs_break,
1958 .send_xchar = rs_send_xchar,
1959 .wait_until_sent = rs_wait_until_sent,
1960 .read_proc = rs_read_proc,
1961 .tiocmget = rs_tiocmget,
1962 .tiocmset = rs_tiocmset,
1963};
1964
1965/*
1966 * The serial driver boot-time initialization code!
1967 */
1968static int __init rs_init(void)
1969{
1970 unsigned long flags;
1971 struct serial_state * state;
1972
1973 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1974 return -ENODEV;
1975
1976 serial_driver = alloc_tty_driver(1);
1977 if (!serial_driver)
1978 return -ENOMEM;
1979
1980 /*
1981 * We request SERDAT and SERPER only, because the serial registers are
1982 * too spreaded over the custom register space
1983 */
1984 if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
1985 return -EBUSY;
1986
1987 IRQ_ports = NULL;
1988
1989 show_serial_version();
1990
1991 /* Initialize the tty_driver structure */
1992
1993 serial_driver->owner = THIS_MODULE;
1994 serial_driver->driver_name = "amiserial";
1995 serial_driver->name = "ttyS";
1996 serial_driver->major = TTY_MAJOR;
1997 serial_driver->minor_start = 64;
1998 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1999 serial_driver->subtype = SERIAL_TYPE_NORMAL;
2000 serial_driver->init_termios = tty_std_termios;
2001 serial_driver->init_termios.c_cflag =
2002 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2003 serial_driver->flags = TTY_DRIVER_REAL_RAW;
2004 tty_set_operations(serial_driver, &serial_ops);
2005
2006 if (tty_register_driver(serial_driver))
2007 panic("Couldn't register serial driver\n");
2008
2009 state = rs_table;
2010 state->magic = SSTATE_MAGIC;
2011 state->port = (int)&custom.serdatr; /* Just to give it a value */
2012 state->line = 0;
2013 state->custom_divisor = 0;
2014 state->close_delay = 5*HZ/10;
2015 state->closing_wait = 30*HZ;
2016 state->icount.cts = state->icount.dsr =
2017 state->icount.rng = state->icount.dcd = 0;
2018 state->icount.rx = state->icount.tx = 0;
2019 state->icount.frame = state->icount.parity = 0;
2020 state->icount.overrun = state->icount.brk = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021
2022 printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2023 state->line);
2024
2025 /* Hardware set up */
2026
2027 state->baud_base = amiga_colorclock;
2028 state->xmit_fifo_size = 1;
2029
2030 local_irq_save(flags);
2031
2032 /* set ISRs, and then disable the rx interrupts */
2033 request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
Thomas Gleixner0f2ed4c2006-07-01 19:29:33 -07002034 request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035
2036 /* turn off Rx and Tx interrupts */
2037 custom.intena = IF_RBF | IF_TBE;
2038 mb();
2039
2040 /* clear any pending interrupt */
2041 custom.intreq = IF_RBF | IF_TBE;
2042 mb();
2043
2044 local_irq_restore(flags);
2045
2046 /*
2047 * set the appropriate directions for the modem control flags,
2048 * and clear RTS and DTR
2049 */
2050 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2051 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2052
2053 return 0;
2054}
2055
2056static __exit void rs_exit(void)
2057{
2058 int error;
2059 struct async_struct *info = rs_table[0].info;
2060
2061 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2062 tasklet_kill(&info->tlet);
2063 if ((error = tty_unregister_driver(serial_driver)))
2064 printk("SERIAL: failed to unregister serial driver (%d)\n",
2065 error);
2066 put_tty_driver(serial_driver);
2067
2068 if (info) {
2069 rs_table[0].info = NULL;
2070 kfree(info);
2071 }
2072
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2074}
2075
2076module_init(rs_init)
2077module_exit(rs_exit)
2078
2079
2080/*
2081 * ------------------------------------------------------------
2082 * Serial console driver
2083 * ------------------------------------------------------------
2084 */
2085#ifdef CONFIG_SERIAL_CONSOLE
2086
2087static void amiga_serial_putc(char c)
2088{
2089 custom.serdat = (unsigned char)c | 0x100;
2090 while (!(custom.serdatr & 0x2000))
2091 barrier();
2092}
2093
2094/*
2095 * Print a string to the serial port trying not to disturb
2096 * any possible real use of the port...
2097 *
2098 * The console must be locked when we get here.
2099 */
2100static void serial_console_write(struct console *co, const char *s,
2101 unsigned count)
2102{
2103 unsigned short intena = custom.intenar;
2104
2105 custom.intena = IF_TBE;
2106
2107 while (count--) {
2108 if (*s == '\n')
2109 amiga_serial_putc('\r');
2110 amiga_serial_putc(*s++);
2111 }
2112
2113 custom.intena = IF_SETCLR | (intena & IF_TBE);
2114}
2115
2116static struct tty_driver *serial_console_device(struct console *c, int *index)
2117{
2118 *index = 0;
2119 return serial_driver;
2120}
2121
2122static struct console sercons = {
2123 .name = "ttyS",
2124 .write = serial_console_write,
2125 .device = serial_console_device,
2126 .flags = CON_PRINTBUFFER,
2127 .index = -1,
2128};
2129
2130/*
2131 * Register console.
2132 */
2133static int __init amiserial_console_init(void)
2134{
2135 register_console(&sercons);
2136 return 0;
2137}
2138console_initcall(amiserial_console_init);
2139#endif
2140
2141MODULE_LICENSE("GPL");