blob: a124f8c5d062dd65b29775881f9b9c55a0d95a14 [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
34#include <linux/config.h>
35#include <linux/delay.h>
36
37#undef SERIAL_PARANOIA_CHECK
38#define SERIAL_DO_RESTART
39
40/* Set of debugging defines */
41
42#undef SERIAL_DEBUG_INTR
43#undef SERIAL_DEBUG_OPEN
44#undef SERIAL_DEBUG_FLOW
45#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
46
47/* Sanity checks */
48
49#define SERIAL_INLINE
50
51#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
52#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
53 tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
54#else
55#define DBG_CNT(s)
56#endif
57
58/*
59 * End of serial driver configuration section.
60 */
61
62#include <linux/module.h>
63
64#include <linux/types.h>
65#include <linux/serial.h>
66#include <linux/serialP.h>
67#include <linux/serial_reg.h>
68static char *serial_version = "4.30";
69
70#include <linux/errno.h>
71#include <linux/signal.h>
72#include <linux/sched.h>
73#include <linux/kernel.h>
74#include <linux/timer.h>
75#include <linux/interrupt.h>
76#include <linux/tty.h>
77#include <linux/tty_flip.h>
78#include <linux/console.h>
79#include <linux/major.h>
80#include <linux/string.h>
81#include <linux/fcntl.h>
82#include <linux/ptrace.h>
83#include <linux/ioport.h>
84#include <linux/mm.h>
85#include <linux/slab.h>
86#include <linux/init.h>
87#include <linux/bitops.h>
88
89#include <asm/setup.h>
90
91#include <asm/system.h>
92
93#include <asm/irq.h>
94
95#include <asm/amigahw.h>
96#include <asm/amigaints.h>
97
98#ifdef SERIAL_INLINE
99#define _INLINE_ inline
100#endif
101
102static char *serial_name = "Amiga-builtin serial driver";
103
104static struct tty_driver *serial_driver;
105
106/* number of characters left in xmit buffer before we ask for more */
107#define WAKEUP_CHARS 256
108
109static struct async_struct *IRQ_ports;
110
111static unsigned char current_ctl_bits;
112
113static void change_speed(struct async_struct *info, struct termios *old);
114static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
115
116
117static struct serial_state rs_table[1];
118
119#define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
120
121/*
122 * tmp_buf is used as a temporary buffer by serial_write. We need to
123 * lock it in case the copy_from_user blocks while swapping in a page,
124 * and some other program tries to do a serial write at the same time.
125 * Since the lock will only come under contention when the system is
126 * swapping and available memory is low, it makes sense to share one
127 * buffer across all the serial ports, since it significantly saves
128 * memory if large numbers of serial ports are open.
129 */
130static unsigned char *tmp_buf;
131static DECLARE_MUTEX(tmp_buf_sem);
132
133#include <asm/uaccess.h>
134
135#define serial_isroot() (capable(CAP_SYS_ADMIN))
136
137
138static inline int serial_paranoia_check(struct async_struct *info,
139 char *name, const char *routine)
140{
141#ifdef SERIAL_PARANOIA_CHECK
142 static const char *badmagic =
143 "Warning: bad magic number for serial struct (%s) in %s\n";
144 static const char *badinfo =
145 "Warning: null async_struct for (%s) in %s\n";
146
147 if (!info) {
148 printk(badinfo, name, routine);
149 return 1;
150 }
151 if (info->magic != SERIAL_MAGIC) {
152 printk(badmagic, name, routine);
153 return 1;
154 }
155#endif
156 return 0;
157}
158
159/* some serial hardware definitions */
160#define SDR_OVRUN (1<<15)
161#define SDR_RBF (1<<14)
162#define SDR_TBE (1<<13)
163#define SDR_TSRE (1<<12)
164
165#define SERPER_PARENB (1<<15)
166
167#define AC_SETCLR (1<<15)
168#define AC_UARTBRK (1<<11)
169
170#define SER_DTR (1<<7)
171#define SER_RTS (1<<6)
172#define SER_DCD (1<<5)
173#define SER_CTS (1<<4)
174#define SER_DSR (1<<3)
175
176static __inline__ void rtsdtr_ctrl(int bits)
177{
178 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
179}
180
181/*
182 * ------------------------------------------------------------
183 * rs_stop() and rs_start()
184 *
185 * This routines are called before setting or resetting tty->stopped.
186 * They enable or disable transmitter interrupts, as necessary.
187 * ------------------------------------------------------------
188 */
189static void rs_stop(struct tty_struct *tty)
190{
191 struct async_struct *info = (struct async_struct *)tty->driver_data;
192 unsigned long flags;
193
194 if (serial_paranoia_check(info, tty->name, "rs_stop"))
195 return;
196
197 local_irq_save(flags);
198 if (info->IER & UART_IER_THRI) {
199 info->IER &= ~UART_IER_THRI;
200 /* disable Tx interrupt and remove any pending interrupts */
201 custom.intena = IF_TBE;
202 mb();
203 custom.intreq = IF_TBE;
204 mb();
205 }
206 local_irq_restore(flags);
207}
208
209static void rs_start(struct tty_struct *tty)
210{
211 struct async_struct *info = (struct async_struct *)tty->driver_data;
212 unsigned long flags;
213
214 if (serial_paranoia_check(info, tty->name, "rs_start"))
215 return;
216
217 local_irq_save(flags);
218 if (info->xmit.head != info->xmit.tail
219 && info->xmit.buf
220 && !(info->IER & UART_IER_THRI)) {
221 info->IER |= UART_IER_THRI;
222 custom.intena = IF_SETCLR | IF_TBE;
223 mb();
224 /* set a pending Tx Interrupt, transmitter should restart now */
225 custom.intreq = IF_SETCLR | IF_TBE;
226 mb();
227 }
228 local_irq_restore(flags);
229}
230
231/*
232 * ----------------------------------------------------------------------
233 *
234 * Here starts the interrupt handling routines. All of the following
235 * subroutines are declared as inline and are folded into
236 * rs_interrupt(). They were separated out for readability's sake.
237 *
238 * Note: rs_interrupt() is a "fast" interrupt, which means that it
239 * runs with interrupts turned off. People who may want to modify
240 * rs_interrupt() should try to keep the interrupt handler as fast as
241 * possible. After you are done making modifications, it is not a bad
242 * idea to do:
243 *
244 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
245 *
246 * and look at the resulting assemble code in serial.s.
247 *
248 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
249 * -----------------------------------------------------------------------
250 */
251
252/*
253 * This routine is used by the interrupt handler to schedule
254 * processing in the software interrupt portion of the driver.
255 */
256static _INLINE_ void rs_sched_event(struct async_struct *info,
257 int event)
258{
259 info->event |= 1 << event;
260 tasklet_schedule(&info->tlet);
261}
262
263static _INLINE_ void receive_chars(struct async_struct *info)
264{
265 int status;
266 int serdatr;
267 struct tty_struct *tty = info->tty;
268 unsigned char ch;
269 struct async_icount *icount;
270
271 icount = &info->state->icount;
272
273 status = UART_LSR_DR; /* We obviously have a character! */
274 serdatr = custom.serdatr;
275 mb();
276 custom.intreq = IF_RBF;
277 mb();
278
279 if((serdatr & 0x1ff) == 0)
280 status |= UART_LSR_BI;
281 if(serdatr & SDR_OVRUN)
282 status |= UART_LSR_OE;
283
284 ch = serdatr & 0xff;
285 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
286 goto ignore_char;
287 *tty->flip.char_buf_ptr = ch;
288 icount->rx++;
289
290#ifdef SERIAL_DEBUG_INTR
291 printk("DR%02x:%02x...", ch, status);
292#endif
293 *tty->flip.flag_buf_ptr = 0;
294
295 /*
296 * We don't handle parity or frame errors - but I have left
297 * the code in, since I'm not sure that the errors can't be
298 * detected.
299 */
300
301 if (status & (UART_LSR_BI | UART_LSR_PE |
302 UART_LSR_FE | UART_LSR_OE)) {
303 /*
304 * For statistics only
305 */
306 if (status & UART_LSR_BI) {
307 status &= ~(UART_LSR_FE | UART_LSR_PE);
308 icount->brk++;
309 } else if (status & UART_LSR_PE)
310 icount->parity++;
311 else if (status & UART_LSR_FE)
312 icount->frame++;
313 if (status & UART_LSR_OE)
314 icount->overrun++;
315
316 /*
317 * Now check to see if character should be
318 * ignored, and mask off conditions which
319 * should be ignored.
320 */
321 if (status & info->ignore_status_mask)
322 goto ignore_char;
323
324 status &= info->read_status_mask;
325
326 if (status & (UART_LSR_BI)) {
327#ifdef SERIAL_DEBUG_INTR
328 printk("handling break....");
329#endif
330 *tty->flip.flag_buf_ptr = TTY_BREAK;
331 if (info->flags & ASYNC_SAK)
332 do_SAK(tty);
333 } else if (status & UART_LSR_PE)
334 *tty->flip.flag_buf_ptr = TTY_PARITY;
335 else if (status & UART_LSR_FE)
336 *tty->flip.flag_buf_ptr = TTY_FRAME;
337 if (status & UART_LSR_OE) {
338 /*
339 * Overrun is special, since it's
340 * reported immediately, and doesn't
341 * affect the current character
342 */
343 if (tty->flip.count < TTY_FLIPBUF_SIZE) {
344 tty->flip.count++;
345 tty->flip.flag_buf_ptr++;
346 tty->flip.char_buf_ptr++;
347 *tty->flip.flag_buf_ptr = TTY_OVERRUN;
348 }
349 }
350 }
351 tty->flip.flag_buf_ptr++;
352 tty->flip.char_buf_ptr++;
353 tty->flip.count++;
354 ignore_char:
355
356 tty_flip_buffer_push(tty);
357}
358
359static _INLINE_ void transmit_chars(struct async_struct *info)
360{
361 custom.intreq = IF_TBE;
362 mb();
363 if (info->x_char) {
364 custom.serdat = info->x_char | 0x100;
365 mb();
366 info->state->icount.tx++;
367 info->x_char = 0;
368 return;
369 }
370 if (info->xmit.head == info->xmit.tail
371 || info->tty->stopped
372 || info->tty->hw_stopped) {
373 info->IER &= ~UART_IER_THRI;
374 custom.intena = IF_TBE;
375 mb();
376 return;
377 }
378
379 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
380 mb();
381 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
382 info->state->icount.tx++;
383
384 if (CIRC_CNT(info->xmit.head,
385 info->xmit.tail,
386 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
387 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
388
389#ifdef SERIAL_DEBUG_INTR
390 printk("THRE...");
391#endif
392 if (info->xmit.head == info->xmit.tail) {
393 custom.intena = IF_TBE;
394 mb();
395 info->IER &= ~UART_IER_THRI;
396 }
397}
398
399static _INLINE_ void check_modem_status(struct async_struct *info)
400{
401 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
402 unsigned char dstatus;
403 struct async_icount *icount;
404
405 /* Determine bits that have changed */
406 dstatus = status ^ current_ctl_bits;
407 current_ctl_bits = status;
408
409 if (dstatus) {
410 icount = &info->state->icount;
411 /* update input line counters */
412 if (dstatus & SER_DSR)
413 icount->dsr++;
414 if (dstatus & SER_DCD) {
415 icount->dcd++;
416#ifdef CONFIG_HARD_PPS
417 if ((info->flags & ASYNC_HARDPPS_CD) &&
418 !(status & SER_DCD))
419 hardpps();
420#endif
421 }
422 if (dstatus & SER_CTS)
423 icount->cts++;
424 wake_up_interruptible(&info->delta_msr_wait);
425 }
426
427 if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
428#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
429 printk("ttyS%d CD now %s...", info->line,
430 (!(status & SER_DCD)) ? "on" : "off");
431#endif
432 if (!(status & SER_DCD))
433 wake_up_interruptible(&info->open_wait);
434 else {
435#ifdef SERIAL_DEBUG_OPEN
436 printk("doing serial hangup...");
437#endif
438 if (info->tty)
439 tty_hangup(info->tty);
440 }
441 }
442 if (info->flags & ASYNC_CTS_FLOW) {
443 if (info->tty->hw_stopped) {
444 if (!(status & SER_CTS)) {
445#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
446 printk("CTS tx start...");
447#endif
448 info->tty->hw_stopped = 0;
449 info->IER |= UART_IER_THRI;
450 custom.intena = IF_SETCLR | IF_TBE;
451 mb();
452 /* set a pending Tx Interrupt, transmitter should restart now */
453 custom.intreq = IF_SETCLR | IF_TBE;
454 mb();
455 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
456 return;
457 }
458 } else {
459 if ((status & SER_CTS)) {
460#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
461 printk("CTS tx stop...");
462#endif
463 info->tty->hw_stopped = 1;
464 info->IER &= ~UART_IER_THRI;
465 /* disable Tx interrupt and remove any pending interrupts */
466 custom.intena = IF_TBE;
467 mb();
468 custom.intreq = IF_TBE;
469 mb();
470 }
471 }
472 }
473}
474
475static irqreturn_t ser_vbl_int( int irq, void *data, struct pt_regs *regs)
476{
477 /* vbl is just a periodic interrupt we tie into to update modem status */
478 struct async_struct * info = IRQ_ports;
479 /*
480 * TBD - is it better to unregister from this interrupt or to
481 * ignore it if MSI is clear ?
482 */
483 if(info->IER & UART_IER_MSI)
484 check_modem_status(info);
485 return IRQ_HANDLED;
486}
487
488static irqreturn_t ser_rx_int(int irq, void *dev_id, struct pt_regs * regs)
489{
490 struct async_struct * info;
491
492#ifdef SERIAL_DEBUG_INTR
493 printk("ser_rx_int...");
494#endif
495
496 info = IRQ_ports;
497 if (!info || !info->tty)
498 return IRQ_NONE;
499
500 receive_chars(info);
501 info->last_active = jiffies;
502#ifdef SERIAL_DEBUG_INTR
503 printk("end.\n");
504#endif
505 return IRQ_HANDLED;
506}
507
508static irqreturn_t ser_tx_int(int irq, void *dev_id, struct pt_regs * regs)
509{
510 struct async_struct * info;
511
512 if (custom.serdatr & SDR_TBE) {
513#ifdef SERIAL_DEBUG_INTR
514 printk("ser_tx_int...");
515#endif
516
517 info = IRQ_ports;
518 if (!info || !info->tty)
519 return IRQ_NONE;
520
521 transmit_chars(info);
522 info->last_active = jiffies;
523#ifdef SERIAL_DEBUG_INTR
524 printk("end.\n");
525#endif
526 }
527 return IRQ_HANDLED;
528}
529
530/*
531 * -------------------------------------------------------------------
532 * Here ends the serial interrupt routines.
533 * -------------------------------------------------------------------
534 */
535
536/*
537 * This routine is used to handle the "bottom half" processing for the
538 * serial driver, known also the "software interrupt" processing.
539 * This processing is done at the kernel interrupt level, after the
540 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
541 * is where time-consuming activities which can not be done in the
542 * interrupt driver proper are done; the interrupt driver schedules
543 * them using rs_sched_event(), and they get done here.
544 */
545
546static void do_softint(unsigned long private_)
547{
548 struct async_struct *info = (struct async_struct *) private_;
549 struct tty_struct *tty;
550
551 tty = info->tty;
552 if (!tty)
553 return;
554
555 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
556 tty_wakeup(tty);
557 wake_up_interruptible(&tty->write_wait);
558 }
559}
560
561/*
562 * ---------------------------------------------------------------
563 * Low level utility subroutines for the serial driver: routines to
564 * figure out the appropriate timeout for an interrupt chain, routines
565 * to initialize and startup a serial port, and routines to shutdown a
566 * serial port. Useful stuff like that.
567 * ---------------------------------------------------------------
568 */
569
570static int startup(struct async_struct * info)
571{
572 unsigned long flags;
573 int retval=0;
574 unsigned long page;
575
576 page = get_zeroed_page(GFP_KERNEL);
577 if (!page)
578 return -ENOMEM;
579
580 local_irq_save(flags);
581
582 if (info->flags & ASYNC_INITIALIZED) {
583 free_page(page);
584 goto errout;
585 }
586
587 if (info->xmit.buf)
588 free_page(page);
589 else
590 info->xmit.buf = (unsigned char *) page;
591
592#ifdef SERIAL_DEBUG_OPEN
593 printk("starting up ttys%d ...", info->line);
594#endif
595
596 /* Clear anything in the input buffer */
597
598 custom.intreq = IF_RBF;
599 mb();
600
601 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
602 if (retval) {
603 if (serial_isroot()) {
604 if (info->tty)
605 set_bit(TTY_IO_ERROR,
606 &info->tty->flags);
607 retval = 0;
608 }
609 goto errout;
610 }
611
612 /* enable both Rx and Tx interrupts */
613 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
614 mb();
615 info->IER = UART_IER_MSI;
616
617 /* remember current state of the DCD and CTS bits */
618 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
619
620 IRQ_ports = info;
621
622 info->MCR = 0;
623 if (info->tty->termios->c_cflag & CBAUD)
624 info->MCR = SER_DTR | SER_RTS;
625 rtsdtr_ctrl(info->MCR);
626
627 if (info->tty)
628 clear_bit(TTY_IO_ERROR, &info->tty->flags);
629 info->xmit.head = info->xmit.tail = 0;
630
631 /*
632 * Set up the tty->alt_speed kludge
633 */
634 if (info->tty) {
635 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
636 info->tty->alt_speed = 57600;
637 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
638 info->tty->alt_speed = 115200;
639 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
640 info->tty->alt_speed = 230400;
641 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
642 info->tty->alt_speed = 460800;
643 }
644
645 /*
646 * and set the speed of the serial port
647 */
648 change_speed(info, NULL);
649
650 info->flags |= ASYNC_INITIALIZED;
651 local_irq_restore(flags);
652 return 0;
653
654errout:
655 local_irq_restore(flags);
656 return retval;
657}
658
659/*
660 * This routine will shutdown a serial port; interrupts are disabled, and
661 * DTR is dropped if the hangup on close termio flag is on.
662 */
663static void shutdown(struct async_struct * info)
664{
665 unsigned long flags;
666 struct serial_state *state;
667
668 if (!(info->flags & ASYNC_INITIALIZED))
669 return;
670
671 state = info->state;
672
673#ifdef SERIAL_DEBUG_OPEN
674 printk("Shutting down serial port %d ....\n", info->line);
675#endif
676
677 local_irq_save(flags); /* Disable interrupts */
678
679 /*
680 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
681 * here so the queue might never be waken up
682 */
683 wake_up_interruptible(&info->delta_msr_wait);
684
685 IRQ_ports = NULL;
686
687 /*
688 * Free the IRQ, if necessary
689 */
690 free_irq(IRQ_AMIGA_VERTB, info);
691
692 if (info->xmit.buf) {
693 free_page((unsigned long) info->xmit.buf);
694 info->xmit.buf = NULL;
695 }
696
697 info->IER = 0;
698 custom.intena = IF_RBF | IF_TBE;
699 mb();
700
701 /* disable break condition */
702 custom.adkcon = AC_UARTBRK;
703 mb();
704
705 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
706 info->MCR &= ~(SER_DTR|SER_RTS);
707 rtsdtr_ctrl(info->MCR);
708
709 if (info->tty)
710 set_bit(TTY_IO_ERROR, &info->tty->flags);
711
712 info->flags &= ~ASYNC_INITIALIZED;
713 local_irq_restore(flags);
714}
715
716
717/*
718 * This routine is called to set the UART divisor registers to match
719 * the specified baud rate for a serial port.
720 */
721static void change_speed(struct async_struct *info,
722 struct termios *old_termios)
723{
724 int quot = 0, baud_base, baud;
725 unsigned cflag, cval = 0;
726 int bits;
727 unsigned long flags;
728
729 if (!info->tty || !info->tty->termios)
730 return;
731 cflag = info->tty->termios->c_cflag;
732
733 /* Byte size is always 8 bits plus parity bit if requested */
734
735 cval = 3; bits = 10;
736 if (cflag & CSTOPB) {
737 cval |= 0x04;
738 bits++;
739 }
740 if (cflag & PARENB) {
741 cval |= UART_LCR_PARITY;
742 bits++;
743 }
744 if (!(cflag & PARODD))
745 cval |= UART_LCR_EPAR;
746#ifdef CMSPAR
747 if (cflag & CMSPAR)
748 cval |= UART_LCR_SPAR;
749#endif
750
751 /* Determine divisor based on baud rate */
752 baud = tty_get_baud_rate(info->tty);
753 if (!baud)
754 baud = 9600; /* B0 transition handled in rs_set_termios */
755 baud_base = info->state->baud_base;
756 if (baud == 38400 &&
757 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
758 quot = info->state->custom_divisor;
759 else {
760 if (baud == 134)
761 /* Special case since 134 is really 134.5 */
762 quot = (2*baud_base / 269);
763 else if (baud)
764 quot = baud_base / baud;
765 }
766 /* If the quotient is zero refuse the change */
767 if (!quot && old_termios) {
768 info->tty->termios->c_cflag &= ~CBAUD;
769 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
770 baud = tty_get_baud_rate(info->tty);
771 if (!baud)
772 baud = 9600;
773 if (baud == 38400 &&
774 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
775 quot = info->state->custom_divisor;
776 else {
777 if (baud == 134)
778 /* Special case since 134 is really 134.5 */
779 quot = (2*baud_base / 269);
780 else if (baud)
781 quot = baud_base / baud;
782 }
783 }
784 /* As a last resort, if the quotient is zero, default to 9600 bps */
785 if (!quot)
786 quot = baud_base / 9600;
787 info->quot = quot;
788 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
789 info->timeout += HZ/50; /* Add .02 seconds of slop */
790
791 /* CTS flow control flag and modem status interrupts */
792 info->IER &= ~UART_IER_MSI;
793 if (info->flags & ASYNC_HARDPPS_CD)
794 info->IER |= UART_IER_MSI;
795 if (cflag & CRTSCTS) {
796 info->flags |= ASYNC_CTS_FLOW;
797 info->IER |= UART_IER_MSI;
798 } else
799 info->flags &= ~ASYNC_CTS_FLOW;
800 if (cflag & CLOCAL)
801 info->flags &= ~ASYNC_CHECK_CD;
802 else {
803 info->flags |= ASYNC_CHECK_CD;
804 info->IER |= UART_IER_MSI;
805 }
806 /* TBD:
807 * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
808 */
809
810 /*
811 * Set up parity check flag
812 */
813#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
814
815 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
816 if (I_INPCK(info->tty))
817 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
818 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
819 info->read_status_mask |= UART_LSR_BI;
820
821 /*
822 * Characters to ignore
823 */
824 info->ignore_status_mask = 0;
825 if (I_IGNPAR(info->tty))
826 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
827 if (I_IGNBRK(info->tty)) {
828 info->ignore_status_mask |= UART_LSR_BI;
829 /*
830 * If we're ignore parity and break indicators, ignore
831 * overruns too. (For real raw support).
832 */
833 if (I_IGNPAR(info->tty))
834 info->ignore_status_mask |= UART_LSR_OE;
835 }
836 /*
837 * !!! ignore all characters if CREAD is not set
838 */
839 if ((cflag & CREAD) == 0)
840 info->ignore_status_mask |= UART_LSR_DR;
841 local_irq_save(flags);
842
843 {
844 short serper;
845
846 /* Set up the baud rate */
847 serper = quot - 1;
848
849 /* Enable or disable parity bit */
850
851 if(cval & UART_LCR_PARITY)
852 serper |= (SERPER_PARENB);
853
854 custom.serper = serper;
855 mb();
856 }
857
858 info->LCR = cval; /* Save LCR */
859 local_irq_restore(flags);
860}
861
862static void rs_put_char(struct tty_struct *tty, unsigned char ch)
863{
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700864 struct async_struct *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 unsigned long flags;
866
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700867 if (!tty)
868 return;
869
870 info = tty->driver_data;
871
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
873 return;
874
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700875 if (!info->xmit.buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 return;
877
878 local_irq_save(flags);
879 if (CIRC_SPACE(info->xmit.head,
880 info->xmit.tail,
881 SERIAL_XMIT_SIZE) == 0) {
882 local_irq_restore(flags);
883 return;
884 }
885
886 info->xmit.buf[info->xmit.head++] = ch;
887 info->xmit.head &= SERIAL_XMIT_SIZE-1;
888 local_irq_restore(flags);
889}
890
891static void rs_flush_chars(struct tty_struct *tty)
892{
893 struct async_struct *info = (struct async_struct *)tty->driver_data;
894 unsigned long flags;
895
896 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
897 return;
898
899 if (info->xmit.head == info->xmit.tail
900 || tty->stopped
901 || tty->hw_stopped
902 || !info->xmit.buf)
903 return;
904
905 local_irq_save(flags);
906 info->IER |= UART_IER_THRI;
907 custom.intena = IF_SETCLR | IF_TBE;
908 mb();
909 /* set a pending Tx Interrupt, transmitter should restart now */
910 custom.intreq = IF_SETCLR | IF_TBE;
911 mb();
912 local_irq_restore(flags);
913}
914
915static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
916{
917 int c, ret = 0;
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700918 struct async_struct *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 unsigned long flags;
920
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700921 if (!tty)
922 return 0;
923
924 info = tty->driver_data;
925
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 if (serial_paranoia_check(info, tty->name, "rs_write"))
927 return 0;
928
TINNES Julien RD-MAPS-ISSd9ad7ef2005-06-23 00:10:08 -0700929 if (!info->xmit.buf || !tmp_buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 return 0;
931
932 local_save_flags(flags);
933 local_irq_disable();
934 while (1) {
935 c = CIRC_SPACE_TO_END(info->xmit.head,
936 info->xmit.tail,
937 SERIAL_XMIT_SIZE);
938 if (count < c)
939 c = count;
940 if (c <= 0) {
941 break;
942 }
943 memcpy(info->xmit.buf + info->xmit.head, buf, c);
944 info->xmit.head = ((info->xmit.head + c) &
945 (SERIAL_XMIT_SIZE-1));
946 buf += c;
947 count -= c;
948 ret += c;
949 }
950 local_irq_restore(flags);
951
952 if (info->xmit.head != info->xmit.tail
953 && !tty->stopped
954 && !tty->hw_stopped
955 && !(info->IER & UART_IER_THRI)) {
956 info->IER |= UART_IER_THRI;
957 local_irq_disable();
958 custom.intena = IF_SETCLR | IF_TBE;
959 mb();
960 /* set a pending Tx Interrupt, transmitter should restart now */
961 custom.intreq = IF_SETCLR | IF_TBE;
962 mb();
963 local_irq_restore(flags);
964 }
965 return ret;
966}
967
968static int rs_write_room(struct tty_struct *tty)
969{
970 struct async_struct *info = (struct async_struct *)tty->driver_data;
971
972 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
973 return 0;
974 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
975}
976
977static int rs_chars_in_buffer(struct tty_struct *tty)
978{
979 struct async_struct *info = (struct async_struct *)tty->driver_data;
980
981 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
982 return 0;
983 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
984}
985
986static void rs_flush_buffer(struct tty_struct *tty)
987{
988 struct async_struct *info = (struct async_struct *)tty->driver_data;
989 unsigned long flags;
990
991 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
992 return;
993 local_irq_save(flags);
994 info->xmit.head = info->xmit.tail = 0;
995 local_irq_restore(flags);
996 wake_up_interruptible(&tty->write_wait);
997 tty_wakeup(tty);
998}
999
1000/*
1001 * This function is used to send a high-priority XON/XOFF character to
1002 * the device
1003 */
1004static void rs_send_xchar(struct tty_struct *tty, char ch)
1005{
1006 struct async_struct *info = (struct async_struct *)tty->driver_data;
1007 unsigned long flags;
1008
1009 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
1010 return;
1011
1012 info->x_char = ch;
1013 if (ch) {
1014 /* Make sure transmit interrupts are on */
1015
1016 /* Check this ! */
1017 local_irq_save(flags);
1018 if(!(custom.intenar & IF_TBE)) {
1019 custom.intena = IF_SETCLR | IF_TBE;
1020 mb();
1021 /* set a pending Tx Interrupt, transmitter should restart now */
1022 custom.intreq = IF_SETCLR | IF_TBE;
1023 mb();
1024 }
1025 local_irq_restore(flags);
1026
1027 info->IER |= UART_IER_THRI;
1028 }
1029}
1030
1031/*
1032 * ------------------------------------------------------------
1033 * rs_throttle()
1034 *
1035 * This routine is called by the upper-layer tty layer to signal that
1036 * incoming characters should be throttled.
1037 * ------------------------------------------------------------
1038 */
1039static void rs_throttle(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("throttle %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_throttle"))
1051 return;
1052
1053 if (I_IXOFF(tty))
1054 rs_send_xchar(tty, STOP_CHAR(tty));
1055
1056 if (tty->termios->c_cflag & CRTSCTS)
1057 info->MCR &= ~SER_RTS;
1058
1059 local_irq_save(flags);
1060 rtsdtr_ctrl(info->MCR);
1061 local_irq_restore(flags);
1062}
1063
1064static void rs_unthrottle(struct tty_struct * tty)
1065{
1066 struct async_struct *info = (struct async_struct *)tty->driver_data;
1067 unsigned long flags;
1068#ifdef SERIAL_DEBUG_THROTTLE
1069 char buf[64];
1070
1071 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1072 tty->ldisc.chars_in_buffer(tty));
1073#endif
1074
1075 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1076 return;
1077
1078 if (I_IXOFF(tty)) {
1079 if (info->x_char)
1080 info->x_char = 0;
1081 else
1082 rs_send_xchar(tty, START_CHAR(tty));
1083 }
1084 if (tty->termios->c_cflag & CRTSCTS)
1085 info->MCR |= SER_RTS;
1086 local_irq_save(flags);
1087 rtsdtr_ctrl(info->MCR);
1088 local_irq_restore(flags);
1089}
1090
1091/*
1092 * ------------------------------------------------------------
1093 * rs_ioctl() and friends
1094 * ------------------------------------------------------------
1095 */
1096
1097static int get_serial_info(struct async_struct * info,
1098 struct serial_struct * retinfo)
1099{
1100 struct serial_struct tmp;
1101 struct serial_state *state = info->state;
1102
1103 if (!retinfo)
1104 return -EFAULT;
1105 memset(&tmp, 0, sizeof(tmp));
1106 tmp.type = state->type;
1107 tmp.line = state->line;
1108 tmp.port = state->port;
1109 tmp.irq = state->irq;
1110 tmp.flags = state->flags;
1111 tmp.xmit_fifo_size = state->xmit_fifo_size;
1112 tmp.baud_base = state->baud_base;
1113 tmp.close_delay = state->close_delay;
1114 tmp.closing_wait = state->closing_wait;
1115 tmp.custom_divisor = state->custom_divisor;
1116 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1117 return -EFAULT;
1118 return 0;
1119}
1120
1121static int set_serial_info(struct async_struct * info,
1122 struct serial_struct * new_info)
1123{
1124 struct serial_struct new_serial;
1125 struct serial_state old_state, *state;
1126 unsigned int change_irq,change_port;
1127 int retval = 0;
1128
1129 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1130 return -EFAULT;
1131 state = info->state;
1132 old_state = *state;
1133
1134 change_irq = new_serial.irq != state->irq;
1135 change_port = (new_serial.port != state->port);
1136 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
1137 return -EINVAL;
1138
1139 if (!serial_isroot()) {
1140 if ((new_serial.baud_base != state->baud_base) ||
1141 (new_serial.close_delay != state->close_delay) ||
1142 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1143 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1144 (state->flags & ~ASYNC_USR_MASK)))
1145 return -EPERM;
1146 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1147 (new_serial.flags & ASYNC_USR_MASK));
1148 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1149 (new_serial.flags & ASYNC_USR_MASK));
1150 state->custom_divisor = new_serial.custom_divisor;
1151 goto check_and_exit;
1152 }
1153
1154 if (new_serial.baud_base < 9600)
1155 return -EINVAL;
1156
1157 /*
1158 * OK, past this point, all the error checking has been done.
1159 * At this point, we start making changes.....
1160 */
1161
1162 state->baud_base = new_serial.baud_base;
1163 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1164 (new_serial.flags & ASYNC_FLAGS));
1165 info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1166 (info->flags & ASYNC_INTERNAL_FLAGS));
1167 state->custom_divisor = new_serial.custom_divisor;
1168 state->close_delay = new_serial.close_delay * HZ/100;
1169 state->closing_wait = new_serial.closing_wait * HZ/100;
1170 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1171
1172check_and_exit:
1173 if (info->flags & ASYNC_INITIALIZED) {
1174 if (((old_state.flags & ASYNC_SPD_MASK) !=
1175 (state->flags & ASYNC_SPD_MASK)) ||
1176 (old_state.custom_divisor != state->custom_divisor)) {
1177 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1178 info->tty->alt_speed = 57600;
1179 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1180 info->tty->alt_speed = 115200;
1181 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1182 info->tty->alt_speed = 230400;
1183 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1184 info->tty->alt_speed = 460800;
1185 change_speed(info, NULL);
1186 }
1187 } else
1188 retval = startup(info);
1189 return retval;
1190}
1191
1192
1193/*
1194 * get_lsr_info - get line status register info
1195 *
1196 * Purpose: Let user call ioctl() to get info when the UART physically
1197 * is emptied. On bus types like RS485, the transmitter must
1198 * release the bus after transmitting. This must be done when
1199 * the transmit shift register is empty, not be done when the
1200 * transmit holding register is empty. This functionality
1201 * allows an RS485 driver to be written in user space.
1202 */
1203static int get_lsr_info(struct async_struct * info, unsigned int *value)
1204{
1205 unsigned char status;
1206 unsigned int result;
1207 unsigned long flags;
1208
1209 local_irq_save(flags);
1210 status = custom.serdatr;
1211 mb();
1212 local_irq_restore(flags);
1213 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1214 if (copy_to_user(value, &result, sizeof(int)))
1215 return -EFAULT;
1216 return 0;
1217}
1218
1219
1220static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1221{
1222 struct async_struct * info = (struct async_struct *)tty->driver_data;
1223 unsigned char control, status;
1224 unsigned long flags;
1225
1226 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1227 return -ENODEV;
1228 if (tty->flags & (1 << TTY_IO_ERROR))
1229 return -EIO;
1230
1231 control = info->MCR;
1232 local_irq_save(flags);
1233 status = ciab.pra;
1234 local_irq_restore(flags);
1235 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1236 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1237 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1238 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1239 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1240}
1241
1242static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1243 unsigned int set, unsigned int clear)
1244{
1245 struct async_struct * info = (struct async_struct *)tty->driver_data;
1246 unsigned long flags;
1247
1248 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1249 return -ENODEV;
1250 if (tty->flags & (1 << TTY_IO_ERROR))
1251 return -EIO;
1252
1253 local_irq_save(flags);
1254 if (set & TIOCM_RTS)
1255 info->MCR |= SER_RTS;
1256 if (set & TIOCM_DTR)
1257 info->MCR |= SER_DTR;
1258 if (clear & TIOCM_RTS)
1259 info->MCR &= ~SER_RTS;
1260 if (clear & TIOCM_DTR)
1261 info->MCR &= ~SER_DTR;
1262 rtsdtr_ctrl(info->MCR);
1263 local_irq_restore(flags);
1264 return 0;
1265}
1266
1267/*
1268 * rs_break() --- routine which turns the break handling on or off
1269 */
1270static void rs_break(struct tty_struct *tty, int break_state)
1271{
1272 struct async_struct * info = (struct async_struct *)tty->driver_data;
1273 unsigned long flags;
1274
1275 if (serial_paranoia_check(info, tty->name, "rs_break"))
1276 return;
1277
1278 local_irq_save(flags);
1279 if (break_state == -1)
1280 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1281 else
1282 custom.adkcon = AC_UARTBRK;
1283 mb();
1284 local_irq_restore(flags);
1285}
1286
1287
1288static int rs_ioctl(struct tty_struct *tty, struct file * file,
1289 unsigned int cmd, unsigned long arg)
1290{
1291 struct async_struct * info = (struct async_struct *)tty->driver_data;
1292 struct async_icount cprev, cnow; /* kernel counter temps */
1293 struct serial_icounter_struct icount;
1294 unsigned long flags;
1295
1296 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1297 return -ENODEV;
1298
1299 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1300 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1301 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1302 if (tty->flags & (1 << TTY_IO_ERROR))
1303 return -EIO;
1304 }
1305
1306 switch (cmd) {
1307 case TIOCGSERIAL:
1308 return get_serial_info(info,
1309 (struct serial_struct *) arg);
1310 case TIOCSSERIAL:
1311 return set_serial_info(info,
1312 (struct serial_struct *) arg);
1313 case TIOCSERCONFIG:
1314 return 0;
1315
1316 case TIOCSERGETLSR: /* Get line status register */
1317 return get_lsr_info(info, (unsigned int *) arg);
1318
1319 case TIOCSERGSTRUCT:
1320 if (copy_to_user((struct async_struct *) arg,
1321 info, sizeof(struct async_struct)))
1322 return -EFAULT;
1323 return 0;
1324
1325 /*
1326 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1327 * - mask passed in arg for lines of interest
1328 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1329 * Caller should use TIOCGICOUNT to see which one it was
1330 */
1331 case TIOCMIWAIT:
1332 local_irq_save(flags);
1333 /* note the counters on entry */
1334 cprev = info->state->icount;
1335 local_irq_restore(flags);
1336 while (1) {
1337 interruptible_sleep_on(&info->delta_msr_wait);
1338 /* see if a signal did it */
1339 if (signal_pending(current))
1340 return -ERESTARTSYS;
1341 local_irq_save(flags);
1342 cnow = info->state->icount; /* atomic copy */
1343 local_irq_restore(flags);
1344 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1345 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1346 return -EIO; /* no change => error */
1347 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1348 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1349 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1350 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1351 return 0;
1352 }
1353 cprev = cnow;
1354 }
1355 /* NOTREACHED */
1356
1357 /*
1358 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1359 * Return: write counters to the user passed counter struct
1360 * NB: both 1->0 and 0->1 transitions are counted except for
1361 * RI where only 0->1 is counted.
1362 */
1363 case TIOCGICOUNT:
1364 local_irq_save(flags);
1365 cnow = info->state->icount;
1366 local_irq_restore(flags);
1367 icount.cts = cnow.cts;
1368 icount.dsr = cnow.dsr;
1369 icount.rng = cnow.rng;
1370 icount.dcd = cnow.dcd;
1371 icount.rx = cnow.rx;
1372 icount.tx = cnow.tx;
1373 icount.frame = cnow.frame;
1374 icount.overrun = cnow.overrun;
1375 icount.parity = cnow.parity;
1376 icount.brk = cnow.brk;
1377 icount.buf_overrun = cnow.buf_overrun;
1378
1379 if (copy_to_user((void *)arg, &icount, sizeof(icount)))
1380 return -EFAULT;
1381 return 0;
1382 case TIOCSERGWILD:
1383 case TIOCSERSWILD:
1384 /* "setserial -W" is called in Debian boot */
1385 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1386 return 0;
1387
1388 default:
1389 return -ENOIOCTLCMD;
1390 }
1391 return 0;
1392}
1393
1394static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1395{
1396 struct async_struct *info = (struct async_struct *)tty->driver_data;
1397 unsigned long flags;
1398 unsigned int cflag = tty->termios->c_cflag;
1399
1400 if ( (cflag == old_termios->c_cflag)
1401 && ( RELEVANT_IFLAG(tty->termios->c_iflag)
1402 == RELEVANT_IFLAG(old_termios->c_iflag)))
1403 return;
1404
1405 change_speed(info, old_termios);
1406
1407 /* Handle transition to B0 status */
1408 if ((old_termios->c_cflag & CBAUD) &&
1409 !(cflag & CBAUD)) {
1410 info->MCR &= ~(SER_DTR|SER_RTS);
1411 local_irq_save(flags);
1412 rtsdtr_ctrl(info->MCR);
1413 local_irq_restore(flags);
1414 }
1415
1416 /* Handle transition away from B0 status */
1417 if (!(old_termios->c_cflag & CBAUD) &&
1418 (cflag & CBAUD)) {
1419 info->MCR |= SER_DTR;
1420 if (!(tty->termios->c_cflag & CRTSCTS) ||
1421 !test_bit(TTY_THROTTLED, &tty->flags)) {
1422 info->MCR |= SER_RTS;
1423 }
1424 local_irq_save(flags);
1425 rtsdtr_ctrl(info->MCR);
1426 local_irq_restore(flags);
1427 }
1428
1429 /* Handle turning off CRTSCTS */
1430 if ((old_termios->c_cflag & CRTSCTS) &&
1431 !(tty->termios->c_cflag & CRTSCTS)) {
1432 tty->hw_stopped = 0;
1433 rs_start(tty);
1434 }
1435
1436#if 0
1437 /*
1438 * No need to wake up processes in open wait, since they
1439 * sample the CLOCAL flag once, and don't recheck it.
1440 * XXX It's not clear whether the current behavior is correct
1441 * or not. Hence, this may change.....
1442 */
1443 if (!(old_termios->c_cflag & CLOCAL) &&
1444 (tty->termios->c_cflag & CLOCAL))
1445 wake_up_interruptible(&info->open_wait);
1446#endif
1447}
1448
1449/*
1450 * ------------------------------------------------------------
1451 * rs_close()
1452 *
1453 * This routine is called when the serial port gets closed. First, we
1454 * wait for the last remaining data to be sent. Then, we unlink its
1455 * async structure from the interrupt chain if necessary, and we free
1456 * that IRQ if nothing is left in the chain.
1457 * ------------------------------------------------------------
1458 */
1459static void rs_close(struct tty_struct *tty, struct file * filp)
1460{
1461 struct async_struct * info = (struct async_struct *)tty->driver_data;
1462 struct serial_state *state;
1463 unsigned long flags;
1464
1465 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1466 return;
1467
1468 state = info->state;
1469
1470 local_irq_save(flags);
1471
1472 if (tty_hung_up_p(filp)) {
1473 DBG_CNT("before DEC-hung");
1474 local_irq_restore(flags);
1475 return;
1476 }
1477
1478#ifdef SERIAL_DEBUG_OPEN
1479 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1480#endif
1481 if ((tty->count == 1) && (state->count != 1)) {
1482 /*
1483 * Uh, oh. tty->count is 1, which means that the tty
1484 * structure will be freed. state->count should always
1485 * be one in these conditions. If it's greater than
1486 * one, we've got real problems, since it means the
1487 * serial port won't be shutdown.
1488 */
1489 printk("rs_close: bad serial port count; tty->count is 1, "
1490 "state->count is %d\n", state->count);
1491 state->count = 1;
1492 }
1493 if (--state->count < 0) {
1494 printk("rs_close: bad serial port count for ttys%d: %d\n",
1495 info->line, state->count);
1496 state->count = 0;
1497 }
1498 if (state->count) {
1499 DBG_CNT("before DEC-2");
1500 local_irq_restore(flags);
1501 return;
1502 }
1503 info->flags |= ASYNC_CLOSING;
1504 /*
1505 * Now we wait for the transmit buffer to clear; and we notify
1506 * the line discipline to only process XON/XOFF characters.
1507 */
1508 tty->closing = 1;
1509 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1510 tty_wait_until_sent(tty, info->closing_wait);
1511 /*
1512 * At this point we stop accepting input. To do this, we
1513 * disable the receive line status interrupts, and tell the
1514 * interrupt driver to stop checking the data ready bit in the
1515 * line status register.
1516 */
1517 info->read_status_mask &= ~UART_LSR_DR;
1518 if (info->flags & ASYNC_INITIALIZED) {
1519 /* disable receive interrupts */
1520 custom.intena = IF_RBF;
1521 mb();
1522 /* clear any pending receive interrupt */
1523 custom.intreq = IF_RBF;
1524 mb();
1525
1526 /*
1527 * Before we drop DTR, make sure the UART transmitter
1528 * has completely drained; this is especially
1529 * important if there is a transmit FIFO!
1530 */
1531 rs_wait_until_sent(tty, info->timeout);
1532 }
1533 shutdown(info);
1534 if (tty->driver->flush_buffer)
1535 tty->driver->flush_buffer(tty);
1536
1537 tty_ldisc_flush(tty);
1538 tty->closing = 0;
1539 info->event = 0;
1540 info->tty = NULL;
1541 if (info->blocked_open) {
1542 if (info->close_delay) {
1543 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1544 }
1545 wake_up_interruptible(&info->open_wait);
1546 }
1547 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1548 wake_up_interruptible(&info->close_wait);
1549 local_irq_restore(flags);
1550}
1551
1552/*
1553 * rs_wait_until_sent() --- wait until the transmitter is empty
1554 */
1555static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1556{
1557 struct async_struct * info = (struct async_struct *)tty->driver_data;
1558 unsigned long orig_jiffies, char_time;
1559 int lsr;
1560
1561 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1562 return;
1563
1564 if (info->xmit_fifo_size == 0)
1565 return; /* Just in case.... */
1566
1567 orig_jiffies = jiffies;
1568 /*
1569 * Set the check interval to be 1/5 of the estimated time to
1570 * send a single character, and make it at least 1. The check
1571 * interval should also be less than the timeout.
1572 *
1573 * Note: we have to use pretty tight timings here to satisfy
1574 * the NIST-PCTS.
1575 */
1576 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1577 char_time = char_time / 5;
1578 if (char_time == 0)
1579 char_time = 1;
1580 if (timeout)
1581 char_time = min_t(unsigned long, char_time, timeout);
1582 /*
1583 * If the transmitter hasn't cleared in twice the approximate
1584 * amount of time to send the entire FIFO, it probably won't
1585 * ever clear. This assumes the UART isn't doing flow
1586 * control, which is currently the case. Hence, if it ever
1587 * takes longer than info->timeout, this is probably due to a
1588 * UART bug of some kind. So, we clamp the timeout parameter at
1589 * 2*info->timeout.
1590 */
1591 if (!timeout || timeout > 2*info->timeout)
1592 timeout = 2*info->timeout;
1593#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1594 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1595 printk("jiff=%lu...", jiffies);
1596#endif
1597 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1598#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1599 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1600#endif
1601 msleep_interruptible(jiffies_to_msecs(char_time));
1602 if (signal_pending(current))
1603 break;
1604 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1605 break;
1606 }
1607 current->state = TASK_RUNNING;
1608#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1609 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1610#endif
1611}
1612
1613/*
1614 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1615 */
1616static void rs_hangup(struct tty_struct *tty)
1617{
1618 struct async_struct * info = (struct async_struct *)tty->driver_data;
1619 struct serial_state *state = info->state;
1620
1621 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1622 return;
1623
1624 state = info->state;
1625
1626 rs_flush_buffer(tty);
1627 shutdown(info);
1628 info->event = 0;
1629 state->count = 0;
1630 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1631 info->tty = NULL;
1632 wake_up_interruptible(&info->open_wait);
1633}
1634
1635/*
1636 * ------------------------------------------------------------
1637 * rs_open() and friends
1638 * ------------------------------------------------------------
1639 */
1640static int block_til_ready(struct tty_struct *tty, struct file * filp,
1641 struct async_struct *info)
1642{
1643#ifdef DECLARE_WAITQUEUE
1644 DECLARE_WAITQUEUE(wait, current);
1645#else
1646 struct wait_queue wait = { current, NULL };
1647#endif
1648 struct serial_state *state = info->state;
1649 int retval;
1650 int do_clocal = 0, extra_count = 0;
1651 unsigned long flags;
1652
1653 /*
1654 * If the device is in the middle of being closed, then block
1655 * until it's done, and then try again.
1656 */
1657 if (tty_hung_up_p(filp) ||
1658 (info->flags & ASYNC_CLOSING)) {
1659 if (info->flags & ASYNC_CLOSING)
1660 interruptible_sleep_on(&info->close_wait);
1661#ifdef SERIAL_DO_RESTART
1662 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1663 -EAGAIN : -ERESTARTSYS);
1664#else
1665 return -EAGAIN;
1666#endif
1667 }
1668
1669 /*
1670 * If non-blocking mode is set, or the port is not enabled,
1671 * then make the check up front and then exit.
1672 */
1673 if ((filp->f_flags & O_NONBLOCK) ||
1674 (tty->flags & (1 << TTY_IO_ERROR))) {
1675 info->flags |= ASYNC_NORMAL_ACTIVE;
1676 return 0;
1677 }
1678
1679 if (tty->termios->c_cflag & CLOCAL)
1680 do_clocal = 1;
1681
1682 /*
1683 * Block waiting for the carrier detect and the line to become
1684 * free (i.e., not in use by the callout). While we are in
1685 * this loop, state->count is dropped by one, so that
1686 * rs_close() knows when to free things. We restore it upon
1687 * exit, either normal or abnormal.
1688 */
1689 retval = 0;
1690 add_wait_queue(&info->open_wait, &wait);
1691#ifdef SERIAL_DEBUG_OPEN
1692 printk("block_til_ready before block: ttys%d, count = %d\n",
1693 state->line, state->count);
1694#endif
1695 local_irq_save(flags);
1696 if (!tty_hung_up_p(filp)) {
1697 extra_count = 1;
1698 state->count--;
1699 }
1700 local_irq_restore(flags);
1701 info->blocked_open++;
1702 while (1) {
1703 local_irq_save(flags);
1704 if (tty->termios->c_cflag & CBAUD)
1705 rtsdtr_ctrl(SER_DTR|SER_RTS);
1706 local_irq_restore(flags);
1707 set_current_state(TASK_INTERRUPTIBLE);
1708 if (tty_hung_up_p(filp) ||
1709 !(info->flags & ASYNC_INITIALIZED)) {
1710#ifdef SERIAL_DO_RESTART
1711 if (info->flags & ASYNC_HUP_NOTIFY)
1712 retval = -EAGAIN;
1713 else
1714 retval = -ERESTARTSYS;
1715#else
1716 retval = -EAGAIN;
1717#endif
1718 break;
1719 }
1720 if (!(info->flags & ASYNC_CLOSING) &&
1721 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1722 break;
1723 if (signal_pending(current)) {
1724 retval = -ERESTARTSYS;
1725 break;
1726 }
1727#ifdef SERIAL_DEBUG_OPEN
1728 printk("block_til_ready blocking: ttys%d, count = %d\n",
1729 info->line, state->count);
1730#endif
1731 schedule();
1732 }
1733 current->state = TASK_RUNNING;
1734 remove_wait_queue(&info->open_wait, &wait);
1735 if (extra_count)
1736 state->count++;
1737 info->blocked_open--;
1738#ifdef SERIAL_DEBUG_OPEN
1739 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1740 info->line, state->count);
1741#endif
1742 if (retval)
1743 return retval;
1744 info->flags |= ASYNC_NORMAL_ACTIVE;
1745 return 0;
1746}
1747
1748static int get_async_struct(int line, struct async_struct **ret_info)
1749{
1750 struct async_struct *info;
1751 struct serial_state *sstate;
1752
1753 sstate = rs_table + line;
1754 sstate->count++;
1755 if (sstate->info) {
1756 *ret_info = sstate->info;
1757 return 0;
1758 }
1759 info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
1760 if (!info) {
1761 sstate->count--;
1762 return -ENOMEM;
1763 }
1764 memset(info, 0, sizeof(struct async_struct));
1765#ifdef DECLARE_WAITQUEUE
1766 init_waitqueue_head(&info->open_wait);
1767 init_waitqueue_head(&info->close_wait);
1768 init_waitqueue_head(&info->delta_msr_wait);
1769#endif
1770 info->magic = SERIAL_MAGIC;
1771 info->port = sstate->port;
1772 info->flags = sstate->flags;
1773 info->xmit_fifo_size = sstate->xmit_fifo_size;
1774 info->line = line;
1775 tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1776 info->state = sstate;
1777 if (sstate->info) {
1778 kfree(info);
1779 *ret_info = sstate->info;
1780 return 0;
1781 }
1782 *ret_info = sstate->info = info;
1783 return 0;
1784}
1785
1786/*
1787 * This routine is called whenever a serial port is opened. It
1788 * enables interrupts for a serial port, linking in its async structure into
1789 * the IRQ chain. It also performs the serial-specific
1790 * initialization for the tty structure.
1791 */
1792static int rs_open(struct tty_struct *tty, struct file * filp)
1793{
1794 struct async_struct *info;
1795 int retval, line;
1796 unsigned long page;
1797
1798 line = tty->index;
1799 if ((line < 0) || (line >= NR_PORTS)) {
1800 return -ENODEV;
1801 }
1802 retval = get_async_struct(line, &info);
1803 if (retval) {
1804 return retval;
1805 }
1806 tty->driver_data = info;
1807 info->tty = tty;
1808 if (serial_paranoia_check(info, tty->name, "rs_open"))
1809 return -ENODEV;
1810
1811#ifdef SERIAL_DEBUG_OPEN
1812 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1813#endif
1814 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1815
1816 if (!tmp_buf) {
1817 page = get_zeroed_page(GFP_KERNEL);
1818 if (!page) {
1819 return -ENOMEM;
1820 }
1821 if (tmp_buf)
1822 free_page(page);
1823 else
1824 tmp_buf = (unsigned char *) page;
1825 }
1826
1827 /*
1828 * If the port is the middle of closing, bail out now
1829 */
1830 if (tty_hung_up_p(filp) ||
1831 (info->flags & ASYNC_CLOSING)) {
1832 if (info->flags & ASYNC_CLOSING)
1833 interruptible_sleep_on(&info->close_wait);
1834#ifdef SERIAL_DO_RESTART
1835 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1836 -EAGAIN : -ERESTARTSYS);
1837#else
1838 return -EAGAIN;
1839#endif
1840 }
1841
1842 /*
1843 * Start up serial port
1844 */
1845 retval = startup(info);
1846 if (retval) {
1847 return retval;
1848 }
1849
1850 retval = block_til_ready(tty, filp, info);
1851 if (retval) {
1852#ifdef SERIAL_DEBUG_OPEN
1853 printk("rs_open returning after block_til_ready with %d\n",
1854 retval);
1855#endif
1856 return retval;
1857 }
1858
1859#ifdef SERIAL_DEBUG_OPEN
1860 printk("rs_open %s successful...", tty->name);
1861#endif
1862 return 0;
1863}
1864
1865/*
1866 * /proc fs routines....
1867 */
1868
1869static inline int line_info(char *buf, struct serial_state *state)
1870{
1871 struct async_struct *info = state->info, scr_info;
1872 char stat_buf[30], control, status;
1873 int ret;
1874 unsigned long flags;
1875
1876 ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1877
1878 /*
1879 * Figure out the current RS-232 lines
1880 */
1881 if (!info) {
1882 info = &scr_info; /* This is just for serial_{in,out} */
1883
1884 info->magic = SERIAL_MAGIC;
1885 info->flags = state->flags;
1886 info->quot = 0;
1887 info->tty = NULL;
1888 }
1889 local_irq_save(flags);
1890 status = ciab.pra;
1891 control = info ? info->MCR : status;
1892 local_irq_restore(flags);
1893
1894 stat_buf[0] = 0;
1895 stat_buf[1] = 0;
1896 if(!(control & SER_RTS))
1897 strcat(stat_buf, "|RTS");
1898 if(!(status & SER_CTS))
1899 strcat(stat_buf, "|CTS");
1900 if(!(control & SER_DTR))
1901 strcat(stat_buf, "|DTR");
1902 if(!(status & SER_DSR))
1903 strcat(stat_buf, "|DSR");
1904 if(!(status & SER_DCD))
1905 strcat(stat_buf, "|CD");
1906
1907 if (info->quot) {
1908 ret += sprintf(buf+ret, " baud:%d",
1909 state->baud_base / info->quot);
1910 }
1911
1912 ret += sprintf(buf+ret, " tx:%d rx:%d",
1913 state->icount.tx, state->icount.rx);
1914
1915 if (state->icount.frame)
1916 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1917
1918 if (state->icount.parity)
1919 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1920
1921 if (state->icount.brk)
1922 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1923
1924 if (state->icount.overrun)
1925 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1926
1927 /*
1928 * Last thing is the RS-232 status lines
1929 */
1930 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1931 return ret;
1932}
1933
1934static int rs_read_proc(char *page, char **start, off_t off, int count,
1935 int *eof, void *data)
1936{
1937 int len = 0, l;
1938 off_t begin = 0;
1939
1940 len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1941 l = line_info(page + len, &rs_table[0]);
1942 len += l;
1943 if (len+begin > off+count)
1944 goto done;
1945 if (len+begin < off) {
1946 begin += len;
1947 len = 0;
1948 }
1949 *eof = 1;
1950done:
1951 if (off >= len+begin)
1952 return 0;
1953 *start = page + (off-begin);
1954 return ((count < begin+len-off) ? count : begin+len-off);
1955}
1956
1957/*
1958 * ---------------------------------------------------------------------
1959 * rs_init() and friends
1960 *
1961 * rs_init() is called at boot-time to initialize the serial driver.
1962 * ---------------------------------------------------------------------
1963 */
1964
1965/*
1966 * This routine prints out the appropriate serial driver version
1967 * number, and identifies which options were configured into this
1968 * driver.
1969 */
1970static _INLINE_ void show_serial_version(void)
1971{
1972 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1973}
1974
1975
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976static struct tty_operations serial_ops = {
1977 .open = rs_open,
1978 .close = rs_close,
1979 .write = rs_write,
1980 .put_char = rs_put_char,
1981 .flush_chars = rs_flush_chars,
1982 .write_room = rs_write_room,
1983 .chars_in_buffer = rs_chars_in_buffer,
1984 .flush_buffer = rs_flush_buffer,
1985 .ioctl = rs_ioctl,
1986 .throttle = rs_throttle,
1987 .unthrottle = rs_unthrottle,
1988 .set_termios = rs_set_termios,
1989 .stop = rs_stop,
1990 .start = rs_start,
1991 .hangup = rs_hangup,
1992 .break_ctl = rs_break,
1993 .send_xchar = rs_send_xchar,
1994 .wait_until_sent = rs_wait_until_sent,
1995 .read_proc = rs_read_proc,
1996 .tiocmget = rs_tiocmget,
1997 .tiocmset = rs_tiocmset,
1998};
1999
2000/*
2001 * The serial driver boot-time initialization code!
2002 */
2003static int __init rs_init(void)
2004{
2005 unsigned long flags;
2006 struct serial_state * state;
2007
2008 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
2009 return -ENODEV;
2010
2011 serial_driver = alloc_tty_driver(1);
2012 if (!serial_driver)
2013 return -ENOMEM;
2014
2015 /*
2016 * We request SERDAT and SERPER only, because the serial registers are
2017 * too spreaded over the custom register space
2018 */
2019 if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
2020 return -EBUSY;
2021
2022 IRQ_ports = NULL;
2023
2024 show_serial_version();
2025
2026 /* Initialize the tty_driver structure */
2027
2028 serial_driver->owner = THIS_MODULE;
2029 serial_driver->driver_name = "amiserial";
2030 serial_driver->name = "ttyS";
2031 serial_driver->major = TTY_MAJOR;
2032 serial_driver->minor_start = 64;
2033 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2034 serial_driver->subtype = SERIAL_TYPE_NORMAL;
2035 serial_driver->init_termios = tty_std_termios;
2036 serial_driver->init_termios.c_cflag =
2037 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2038 serial_driver->flags = TTY_DRIVER_REAL_RAW;
2039 tty_set_operations(serial_driver, &serial_ops);
2040
2041 if (tty_register_driver(serial_driver))
2042 panic("Couldn't register serial driver\n");
2043
2044 state = rs_table;
2045 state->magic = SSTATE_MAGIC;
2046 state->port = (int)&custom.serdatr; /* Just to give it a value */
2047 state->line = 0;
2048 state->custom_divisor = 0;
2049 state->close_delay = 5*HZ/10;
2050 state->closing_wait = 30*HZ;
2051 state->icount.cts = state->icount.dsr =
2052 state->icount.rng = state->icount.dcd = 0;
2053 state->icount.rx = state->icount.tx = 0;
2054 state->icount.frame = state->icount.parity = 0;
2055 state->icount.overrun = state->icount.brk = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056
2057 printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2058 state->line);
2059
2060 /* Hardware set up */
2061
2062 state->baud_base = amiga_colorclock;
2063 state->xmit_fifo_size = 1;
2064
2065 local_irq_save(flags);
2066
2067 /* set ISRs, and then disable the rx interrupts */
2068 request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2069 request_irq(IRQ_AMIGA_RBF, ser_rx_int, SA_INTERRUPT, "serial RX", state);
2070
2071 /* turn off Rx and Tx interrupts */
2072 custom.intena = IF_RBF | IF_TBE;
2073 mb();
2074
2075 /* clear any pending interrupt */
2076 custom.intreq = IF_RBF | IF_TBE;
2077 mb();
2078
2079 local_irq_restore(flags);
2080
2081 /*
2082 * set the appropriate directions for the modem control flags,
2083 * and clear RTS and DTR
2084 */
2085 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2086 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2087
2088 return 0;
2089}
2090
2091static __exit void rs_exit(void)
2092{
2093 int error;
2094 struct async_struct *info = rs_table[0].info;
2095
2096 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2097 tasklet_kill(&info->tlet);
2098 if ((error = tty_unregister_driver(serial_driver)))
2099 printk("SERIAL: failed to unregister serial driver (%d)\n",
2100 error);
2101 put_tty_driver(serial_driver);
2102
2103 if (info) {
2104 rs_table[0].info = NULL;
2105 kfree(info);
2106 }
2107
2108 if (tmp_buf) {
2109 free_page((unsigned long) tmp_buf);
2110 tmp_buf = NULL;
2111 }
2112
2113 release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2114}
2115
2116module_init(rs_init)
2117module_exit(rs_exit)
2118
2119
2120/*
2121 * ------------------------------------------------------------
2122 * Serial console driver
2123 * ------------------------------------------------------------
2124 */
2125#ifdef CONFIG_SERIAL_CONSOLE
2126
2127static void amiga_serial_putc(char c)
2128{
2129 custom.serdat = (unsigned char)c | 0x100;
2130 while (!(custom.serdatr & 0x2000))
2131 barrier();
2132}
2133
2134/*
2135 * Print a string to the serial port trying not to disturb
2136 * any possible real use of the port...
2137 *
2138 * The console must be locked when we get here.
2139 */
2140static void serial_console_write(struct console *co, const char *s,
2141 unsigned count)
2142{
2143 unsigned short intena = custom.intenar;
2144
2145 custom.intena = IF_TBE;
2146
2147 while (count--) {
2148 if (*s == '\n')
2149 amiga_serial_putc('\r');
2150 amiga_serial_putc(*s++);
2151 }
2152
2153 custom.intena = IF_SETCLR | (intena & IF_TBE);
2154}
2155
2156static struct tty_driver *serial_console_device(struct console *c, int *index)
2157{
2158 *index = 0;
2159 return serial_driver;
2160}
2161
2162static struct console sercons = {
2163 .name = "ttyS",
2164 .write = serial_console_write,
2165 .device = serial_console_device,
2166 .flags = CON_PRINTBUFFER,
2167 .index = -1,
2168};
2169
2170/*
2171 * Register console.
2172 */
2173static int __init amiserial_console_init(void)
2174{
2175 register_console(&sercons);
2176 return 0;
2177}
2178console_initcall(amiserial_console_init);
2179#endif
2180
2181MODULE_LICENSE("GPL");