TTY: amiserial, provide carrier helpers
[deliverable/linux.git] / drivers / tty / amiserial.c
CommitLineData
1da177e4 1/*
1da177e4
LT
2 * Serial driver for the amiga builtin port.
3 *
4 * This code was created by taking serial.c version 4.30 from kernel
5 * release 2.3.22, replacing all hardware related stuff with the
6 * corresponding amiga hardware actions, and removing all irrelevant
7 * code. As a consequence, it uses many of the constants and names
8 * associated with the registers and bits of 16550 compatible UARTS -
9 * but only to keep track of status, etc in the state variables. It
10 * was done this was to make it easier to keep the code in line with
11 * (non hardware specific) changes to serial.c.
12 *
13 * The port is registered with the tty driver as minor device 64, and
14 * therefore other ports should should only use 65 upwards.
15 *
16 * Richard Lucock 28/12/99
17 *
18 * Copyright (C) 1991, 1992 Linus Torvalds
19 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
20 * 1998, 1999 Theodore Ts'o
21 *
22 */
23
24/*
25 * Serial driver configuration section. Here are the various options:
26 *
27 * SERIAL_PARANOIA_CHECK
28 * Check the magic number for the async_structure where
29 * ever possible.
30 */
31
1da177e4
LT
32#include <linux/delay.h>
33
34#undef SERIAL_PARANOIA_CHECK
35#define SERIAL_DO_RESTART
36
37/* Set of debugging defines */
38
39#undef SERIAL_DEBUG_INTR
40#undef SERIAL_DEBUG_OPEN
41#undef SERIAL_DEBUG_FLOW
42#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
43
44/* Sanity checks */
45
1da177e4
LT
46#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
47#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
01bd730d 48 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
1da177e4
LT
49#else
50#define DBG_CNT(s)
51#endif
52
53/*
54 * End of serial driver configuration section.
55 */
56
57#include <linux/module.h>
58
59#include <linux/types.h>
60#include <linux/serial.h>
1da177e4
LT
61#include <linux/serial_reg.h>
62static char *serial_version = "4.30";
63
64#include <linux/errno.h>
65#include <linux/signal.h>
66#include <linux/sched.h>
67#include <linux/kernel.h>
68#include <linux/timer.h>
69#include <linux/interrupt.h>
70#include <linux/tty.h>
71#include <linux/tty_flip.h>
6fe18d26 72#include <linux/circ_buf.h>
1da177e4
LT
73#include <linux/console.h>
74#include <linux/major.h>
75#include <linux/string.h>
76#include <linux/fcntl.h>
77#include <linux/ptrace.h>
78#include <linux/ioport.h>
79#include <linux/mm.h>
d594027d 80#include <linux/seq_file.h>
1da177e4
LT
81#include <linux/slab.h>
82#include <linux/init.h>
83#include <linux/bitops.h>
826e8c8c 84#include <linux/platform_device.h>
1da177e4
LT
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
6fe18d26
JS
95struct serial_state {
96 struct tty_port tport;
97 struct circ_buf xmit;
98 struct async_icount icount;
99
100 unsigned long port;
101 int baud_base;
102 int xmit_fifo_size;
103 int custom_divisor;
104 int read_status_mask;
105 int ignore_status_mask;
106 int timeout;
107 int quot;
108 int IER; /* Interrupt Enable Register */
109 int MCR; /* Modem control register */
110 int x_char; /* xon/xoff character */
111};
112
b4290a23 113#define custom amiga_custom
1da177e4
LT
114static char *serial_name = "Amiga-builtin serial driver";
115
116static struct tty_driver *serial_driver;
117
118/* number of characters left in xmit buffer before we ask for more */
119#define WAKEUP_CHARS 256
120
1da177e4
LT
121static unsigned char current_ctl_bits;
122
588993dd
JS
123static void change_speed(struct tty_struct *tty, struct serial_state *info,
124 struct ktermios *old);
1da177e4
LT
125static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
126
127
128static struct serial_state rs_table[1];
129
fe971071 130#define NR_PORTS ARRAY_SIZE(rs_table)
1da177e4 131
1da177e4
LT
132#include <asm/uaccess.h>
133
134#define serial_isroot() (capable(CAP_SYS_ADMIN))
135
136
916b7656 137static inline int serial_paranoia_check(struct serial_state *info,
1da177e4
LT
138 char *name, const char *routine)
139{
140#ifdef SERIAL_PARANOIA_CHECK
141 static const char *badmagic =
142 "Warning: bad magic number for serial struct (%s) in %s\n";
143 static const char *badinfo =
144 "Warning: null async_struct for (%s) in %s\n";
145
146 if (!info) {
147 printk(badinfo, name, routine);
148 return 1;
149 }
150 if (info->magic != SERIAL_MAGIC) {
151 printk(badmagic, name, routine);
152 return 1;
153 }
154#endif
155 return 0;
156}
157
158/* some serial hardware definitions */
159#define SDR_OVRUN (1<<15)
160#define SDR_RBF (1<<14)
161#define SDR_TBE (1<<13)
162#define SDR_TSRE (1<<12)
163
164#define SERPER_PARENB (1<<15)
165
166#define AC_SETCLR (1<<15)
167#define AC_UARTBRK (1<<11)
168
169#define SER_DTR (1<<7)
170#define SER_RTS (1<<6)
171#define SER_DCD (1<<5)
172#define SER_CTS (1<<4)
173#define SER_DSR (1<<3)
174
175static __inline__ void rtsdtr_ctrl(int bits)
176{
177 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
178}
179
180/*
181 * ------------------------------------------------------------
182 * rs_stop() and rs_start()
183 *
184 * This routines are called before setting or resetting tty->stopped.
185 * They enable or disable transmitter interrupts, as necessary.
186 * ------------------------------------------------------------
187 */
188static void rs_stop(struct tty_struct *tty)
189{
916b7656 190 struct serial_state *info = tty->driver_data;
1da177e4
LT
191 unsigned long flags;
192
193 if (serial_paranoia_check(info, tty->name, "rs_stop"))
194 return;
195
196 local_irq_save(flags);
197 if (info->IER & UART_IER_THRI) {
198 info->IER &= ~UART_IER_THRI;
199 /* disable Tx interrupt and remove any pending interrupts */
200 custom.intena = IF_TBE;
201 mb();
202 custom.intreq = IF_TBE;
203 mb();
204 }
205 local_irq_restore(flags);
206}
207
208static void rs_start(struct tty_struct *tty)
209{
916b7656 210 struct serial_state *info = tty->driver_data;
1da177e4
LT
211 unsigned long flags;
212
213 if (serial_paranoia_check(info, tty->name, "rs_start"))
214 return;
215
216 local_irq_save(flags);
217 if (info->xmit.head != info->xmit.tail
218 && info->xmit.buf
219 && !(info->IER & UART_IER_THRI)) {
220 info->IER |= UART_IER_THRI;
221 custom.intena = IF_SETCLR | IF_TBE;
222 mb();
223 /* set a pending Tx Interrupt, transmitter should restart now */
224 custom.intreq = IF_SETCLR | IF_TBE;
225 mb();
226 }
227 local_irq_restore(flags);
228}
229
230/*
231 * ----------------------------------------------------------------------
232 *
233 * Here starts the interrupt handling routines. All of the following
234 * subroutines are declared as inline and are folded into
235 * rs_interrupt(). They were separated out for readability's sake.
236 *
237 * Note: rs_interrupt() is a "fast" interrupt, which means that it
238 * runs with interrupts turned off. People who may want to modify
239 * rs_interrupt() should try to keep the interrupt handler as fast as
240 * possible. After you are done making modifications, it is not a bad
241 * idea to do:
242 *
243 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
244 *
245 * and look at the resulting assemble code in serial.s.
246 *
247 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
248 * -----------------------------------------------------------------------
249 */
250
916b7656 251static void receive_chars(struct serial_state *info)
1da177e4
LT
252{
253 int status;
254 int serdatr;
87758791 255 struct tty_struct *tty = info->tport.tty;
33f0f88f 256 unsigned char ch, flag;
1da177e4 257 struct async_icount *icount;
33f0f88f 258 int oe = 0;
1da177e4 259
916b7656 260 icount = &info->icount;
1da177e4
LT
261
262 status = UART_LSR_DR; /* We obviously have a character! */
263 serdatr = custom.serdatr;
264 mb();
265 custom.intreq = IF_RBF;
266 mb();
267
268 if((serdatr & 0x1ff) == 0)
269 status |= UART_LSR_BI;
270 if(serdatr & SDR_OVRUN)
271 status |= UART_LSR_OE;
272
273 ch = serdatr & 0xff;
1da177e4
LT
274 icount->rx++;
275
276#ifdef SERIAL_DEBUG_INTR
277 printk("DR%02x:%02x...", ch, status);
278#endif
33f0f88f 279 flag = TTY_NORMAL;
1da177e4
LT
280
281 /*
282 * We don't handle parity or frame errors - but I have left
283 * the code in, since I'm not sure that the errors can't be
284 * detected.
285 */
286
287 if (status & (UART_LSR_BI | UART_LSR_PE |
288 UART_LSR_FE | UART_LSR_OE)) {
289 /*
290 * For statistics only
291 */
292 if (status & UART_LSR_BI) {
293 status &= ~(UART_LSR_FE | UART_LSR_PE);
294 icount->brk++;
295 } else if (status & UART_LSR_PE)
296 icount->parity++;
297 else if (status & UART_LSR_FE)
298 icount->frame++;
299 if (status & UART_LSR_OE)
300 icount->overrun++;
301
302 /*
303 * Now check to see if character should be
304 * ignored, and mask off conditions which
305 * should be ignored.
306 */
307 if (status & info->ignore_status_mask)
33f0f88f 308 goto out;
1da177e4
LT
309
310 status &= info->read_status_mask;
311
312 if (status & (UART_LSR_BI)) {
313#ifdef SERIAL_DEBUG_INTR
314 printk("handling break....");
315#endif
33f0f88f 316 flag = TTY_BREAK;
01bd730d 317 if (info->tport.flags & ASYNC_SAK)
1da177e4
LT
318 do_SAK(tty);
319 } else if (status & UART_LSR_PE)
33f0f88f 320 flag = TTY_PARITY;
1da177e4 321 else if (status & UART_LSR_FE)
33f0f88f 322 flag = TTY_FRAME;
1da177e4
LT
323 if (status & UART_LSR_OE) {
324 /*
325 * Overrun is special, since it's
326 * reported immediately, and doesn't
327 * affect the current character
328 */
33f0f88f 329 oe = 1;
1da177e4
LT
330 }
331 }
33f0f88f
AC
332 tty_insert_flip_char(tty, ch, flag);
333 if (oe == 1)
334 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1da177e4 335 tty_flip_buffer_push(tty);
33f0f88f
AC
336out:
337 return;
1da177e4
LT
338}
339
916b7656 340static void transmit_chars(struct serial_state *info)
1da177e4
LT
341{
342 custom.intreq = IF_TBE;
343 mb();
344 if (info->x_char) {
345 custom.serdat = info->x_char | 0x100;
346 mb();
916b7656 347 info->icount.tx++;
1da177e4
LT
348 info->x_char = 0;
349 return;
350 }
351 if (info->xmit.head == info->xmit.tail
87758791
JS
352 || info->tport.tty->stopped
353 || info->tport.tty->hw_stopped) {
1da177e4
LT
354 info->IER &= ~UART_IER_THRI;
355 custom.intena = IF_TBE;
356 mb();
357 return;
358 }
359
360 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
361 mb();
362 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
916b7656 363 info->icount.tx++;
1da177e4
LT
364
365 if (CIRC_CNT(info->xmit.head,
366 info->xmit.tail,
367 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
87758791 368 tty_wakeup(info->tport.tty);
1da177e4
LT
369
370#ifdef SERIAL_DEBUG_INTR
371 printk("THRE...");
372#endif
373 if (info->xmit.head == info->xmit.tail) {
374 custom.intena = IF_TBE;
375 mb();
376 info->IER &= ~UART_IER_THRI;
377 }
378}
379
916b7656 380static void check_modem_status(struct serial_state *info)
1da177e4 381{
7188dc20 382 struct tty_port *port = &info->tport;
1da177e4
LT
383 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
384 unsigned char dstatus;
385 struct async_icount *icount;
386
387 /* Determine bits that have changed */
388 dstatus = status ^ current_ctl_bits;
389 current_ctl_bits = status;
390
391 if (dstatus) {
916b7656 392 icount = &info->icount;
1da177e4
LT
393 /* update input line counters */
394 if (dstatus & SER_DSR)
395 icount->dsr++;
396 if (dstatus & SER_DCD) {
397 icount->dcd++;
398#ifdef CONFIG_HARD_PPS
7188dc20 399 if ((port->flags & ASYNC_HARDPPS_CD) &&
1da177e4
LT
400 !(status & SER_DCD))
401 hardpps();
402#endif
403 }
404 if (dstatus & SER_CTS)
405 icount->cts++;
7188dc20 406 wake_up_interruptible(&port->delta_msr_wait);
1da177e4
LT
407 }
408
7188dc20 409 if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
1da177e4
LT
410#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
411 printk("ttyS%d CD now %s...", info->line,
412 (!(status & SER_DCD)) ? "on" : "off");
413#endif
414 if (!(status & SER_DCD))
7188dc20 415 wake_up_interruptible(&port->open_wait);
1da177e4
LT
416 else {
417#ifdef SERIAL_DEBUG_OPEN
418 printk("doing serial hangup...");
419#endif
7188dc20
JS
420 if (port->tty)
421 tty_hangup(port->tty);
1da177e4
LT
422 }
423 }
7188dc20
JS
424 if (port->flags & ASYNC_CTS_FLOW) {
425 if (port->tty->hw_stopped) {
1da177e4
LT
426 if (!(status & SER_CTS)) {
427#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
428 printk("CTS tx start...");
429#endif
7188dc20 430 port->tty->hw_stopped = 0;
1da177e4
LT
431 info->IER |= UART_IER_THRI;
432 custom.intena = IF_SETCLR | IF_TBE;
433 mb();
434 /* set a pending Tx Interrupt, transmitter should restart now */
435 custom.intreq = IF_SETCLR | IF_TBE;
436 mb();
7188dc20 437 tty_wakeup(port->tty);
1da177e4
LT
438 return;
439 }
440 } else {
441 if ((status & SER_CTS)) {
442#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
443 printk("CTS tx stop...");
444#endif
7188dc20 445 port->tty->hw_stopped = 1;
1da177e4
LT
446 info->IER &= ~UART_IER_THRI;
447 /* disable Tx interrupt and remove any pending interrupts */
448 custom.intena = IF_TBE;
449 mb();
450 custom.intreq = IF_TBE;
451 mb();
452 }
453 }
454 }
455}
456
7d12e780 457static irqreturn_t ser_vbl_int( int irq, void *data)
1da177e4
LT
458{
459 /* vbl is just a periodic interrupt we tie into to update modem status */
916b7656 460 struct serial_state *info = data;
1da177e4
LT
461 /*
462 * TBD - is it better to unregister from this interrupt or to
463 * ignore it if MSI is clear ?
464 */
465 if(info->IER & UART_IER_MSI)
466 check_modem_status(info);
467 return IRQ_HANDLED;
468}
469
7d12e780 470static irqreturn_t ser_rx_int(int irq, void *dev_id)
1da177e4 471{
916b7656 472 struct serial_state *info = dev_id;
1da177e4
LT
473
474#ifdef SERIAL_DEBUG_INTR
475 printk("ser_rx_int...");
476#endif
477
87758791 478 if (!info->tport.tty)
1da177e4
LT
479 return IRQ_NONE;
480
481 receive_chars(info);
1da177e4
LT
482#ifdef SERIAL_DEBUG_INTR
483 printk("end.\n");
484#endif
485 return IRQ_HANDLED;
486}
487
7d12e780 488static irqreturn_t ser_tx_int(int irq, void *dev_id)
1da177e4 489{
916b7656 490 struct serial_state *info = dev_id;
1da177e4
LT
491
492 if (custom.serdatr & SDR_TBE) {
493#ifdef SERIAL_DEBUG_INTR
494 printk("ser_tx_int...");
495#endif
496
87758791 497 if (!info->tport.tty)
1da177e4
LT
498 return IRQ_NONE;
499
500 transmit_chars(info);
1da177e4
LT
501#ifdef SERIAL_DEBUG_INTR
502 printk("end.\n");
503#endif
504 }
505 return IRQ_HANDLED;
506}
507
508/*
509 * -------------------------------------------------------------------
510 * Here ends the serial interrupt routines.
511 * -------------------------------------------------------------------
512 */
513
1da177e4
LT
514/*
515 * ---------------------------------------------------------------
516 * Low level utility subroutines for the serial driver: routines to
517 * figure out the appropriate timeout for an interrupt chain, routines
518 * to initialize and startup a serial port, and routines to shutdown a
519 * serial port. Useful stuff like that.
520 * ---------------------------------------------------------------
521 */
522
588993dd 523static int startup(struct tty_struct *tty, struct serial_state *info)
1da177e4 524{
01bd730d 525 struct tty_port *port = &info->tport;
1da177e4
LT
526 unsigned long flags;
527 int retval=0;
528 unsigned long page;
529
530 page = get_zeroed_page(GFP_KERNEL);
531 if (!page)
532 return -ENOMEM;
533
534 local_irq_save(flags);
535
01bd730d 536 if (port->flags & ASYNC_INITIALIZED) {
1da177e4
LT
537 free_page(page);
538 goto errout;
539 }
540
541 if (info->xmit.buf)
542 free_page(page);
543 else
544 info->xmit.buf = (unsigned char *) page;
545
546#ifdef SERIAL_DEBUG_OPEN
547 printk("starting up ttys%d ...", info->line);
548#endif
549
550 /* Clear anything in the input buffer */
551
552 custom.intreq = IF_RBF;
553 mb();
554
555 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
556 if (retval) {
557 if (serial_isroot()) {
588993dd 558 set_bit(TTY_IO_ERROR, &tty->flags);
1da177e4
LT
559 retval = 0;
560 }
561 goto errout;
562 }
563
564 /* enable both Rx and Tx interrupts */
565 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
566 mb();
567 info->IER = UART_IER_MSI;
568
569 /* remember current state of the DCD and CTS bits */
570 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
571
1da177e4 572 info->MCR = 0;
588993dd 573 if (C_BAUD(tty))
1da177e4
LT
574 info->MCR = SER_DTR | SER_RTS;
575 rtsdtr_ctrl(info->MCR);
576
588993dd 577 clear_bit(TTY_IO_ERROR, &tty->flags);
1da177e4
LT
578 info->xmit.head = info->xmit.tail = 0;
579
580 /*
581 * Set up the tty->alt_speed kludge
582 */
01bd730d 583 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
588993dd 584 tty->alt_speed = 57600;
01bd730d 585 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
588993dd 586 tty->alt_speed = 115200;
01bd730d 587 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
588993dd 588 tty->alt_speed = 230400;
01bd730d 589 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
588993dd 590 tty->alt_speed = 460800;
1da177e4
LT
591
592 /*
593 * and set the speed of the serial port
594 */
588993dd 595 change_speed(tty, info, NULL);
1da177e4 596
01bd730d 597 port->flags |= ASYNC_INITIALIZED;
1da177e4
LT
598 local_irq_restore(flags);
599 return 0;
600
601errout:
602 local_irq_restore(flags);
603 return retval;
604}
605
606/*
607 * This routine will shutdown a serial port; interrupts are disabled, and
608 * DTR is dropped if the hangup on close termio flag is on.
609 */
588993dd 610static void shutdown(struct tty_struct *tty, struct serial_state *info)
1da177e4
LT
611{
612 unsigned long flags;
613 struct serial_state *state;
614
01bd730d 615 if (!(info->tport.flags & ASYNC_INITIALIZED))
1da177e4
LT
616 return;
617
916b7656 618 state = info;
1da177e4
LT
619
620#ifdef SERIAL_DEBUG_OPEN
621 printk("Shutting down serial port %d ....\n", info->line);
622#endif
623
624 local_irq_save(flags); /* Disable interrupts */
625
626 /*
627 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
628 * here so the queue might never be waken up
629 */
87758791 630 wake_up_interruptible(&info->tport.delta_msr_wait);
1da177e4 631
1da177e4
LT
632 /*
633 * Free the IRQ, if necessary
634 */
635 free_irq(IRQ_AMIGA_VERTB, info);
636
637 if (info->xmit.buf) {
638 free_page((unsigned long) info->xmit.buf);
639 info->xmit.buf = NULL;
640 }
641
642 info->IER = 0;
643 custom.intena = IF_RBF | IF_TBE;
644 mb();
645
646 /* disable break condition */
647 custom.adkcon = AC_UARTBRK;
648 mb();
649
588993dd 650 if (tty->termios->c_cflag & HUPCL)
1da177e4
LT
651 info->MCR &= ~(SER_DTR|SER_RTS);
652 rtsdtr_ctrl(info->MCR);
653
588993dd 654 set_bit(TTY_IO_ERROR, &tty->flags);
1da177e4 655
01bd730d 656 info->tport.flags &= ~ASYNC_INITIALIZED;
1da177e4
LT
657 local_irq_restore(flags);
658}
659
660
661/*
662 * This routine is called to set the UART divisor registers to match
663 * the specified baud rate for a serial port.
664 */
588993dd 665static void change_speed(struct tty_struct *tty, struct serial_state *info,
606d099c 666 struct ktermios *old_termios)
1da177e4 667{
01bd730d 668 struct tty_port *port = &info->tport;
1da177e4
LT
669 int quot = 0, baud_base, baud;
670 unsigned cflag, cval = 0;
671 int bits;
672 unsigned long flags;
673
588993dd 674 cflag = tty->termios->c_cflag;
1da177e4
LT
675
676 /* Byte size is always 8 bits plus parity bit if requested */
677
678 cval = 3; bits = 10;
679 if (cflag & CSTOPB) {
680 cval |= 0x04;
681 bits++;
682 }
683 if (cflag & PARENB) {
684 cval |= UART_LCR_PARITY;
685 bits++;
686 }
687 if (!(cflag & PARODD))
688 cval |= UART_LCR_EPAR;
689#ifdef CMSPAR
690 if (cflag & CMSPAR)
691 cval |= UART_LCR_SPAR;
692#endif
693
694 /* Determine divisor based on baud rate */
588993dd 695 baud = tty_get_baud_rate(tty);
1da177e4
LT
696 if (!baud)
697 baud = 9600; /* B0 transition handled in rs_set_termios */
916b7656 698 baud_base = info->baud_base;
01bd730d 699 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
916b7656 700 quot = info->custom_divisor;
1da177e4
LT
701 else {
702 if (baud == 134)
703 /* Special case since 134 is really 134.5 */
704 quot = (2*baud_base / 269);
705 else if (baud)
706 quot = baud_base / baud;
707 }
708 /* If the quotient is zero refuse the change */
709 if (!quot && old_termios) {
db0ef08e 710 /* FIXME: Will need updating for new tty in the end */
588993dd
JS
711 tty->termios->c_cflag &= ~CBAUD;
712 tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
713 baud = tty_get_baud_rate(tty);
1da177e4
LT
714 if (!baud)
715 baud = 9600;
716 if (baud == 38400 &&
01bd730d 717 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
916b7656 718 quot = info->custom_divisor;
1da177e4
LT
719 else {
720 if (baud == 134)
721 /* Special case since 134 is really 134.5 */
722 quot = (2*baud_base / 269);
723 else if (baud)
724 quot = baud_base / baud;
725 }
726 }
727 /* As a last resort, if the quotient is zero, default to 9600 bps */
728 if (!quot)
729 quot = baud_base / 9600;
730 info->quot = quot;
916b7656 731 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
1da177e4
LT
732 info->timeout += HZ/50; /* Add .02 seconds of slop */
733
734 /* CTS flow control flag and modem status interrupts */
735 info->IER &= ~UART_IER_MSI;
01bd730d 736 if (port->flags & ASYNC_HARDPPS_CD)
1da177e4
LT
737 info->IER |= UART_IER_MSI;
738 if (cflag & CRTSCTS) {
01bd730d 739 port->flags |= ASYNC_CTS_FLOW;
1da177e4
LT
740 info->IER |= UART_IER_MSI;
741 } else
01bd730d 742 port->flags &= ~ASYNC_CTS_FLOW;
1da177e4 743 if (cflag & CLOCAL)
01bd730d 744 port->flags &= ~ASYNC_CHECK_CD;
1da177e4 745 else {
01bd730d 746 port->flags |= ASYNC_CHECK_CD;
1da177e4
LT
747 info->IER |= UART_IER_MSI;
748 }
749 /* TBD:
4b512d26 750 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
1da177e4
LT
751 */
752
753 /*
754 * Set up parity check flag
755 */
1da177e4
LT
756
757 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
588993dd 758 if (I_INPCK(tty))
1da177e4 759 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
588993dd 760 if (I_BRKINT(tty) || I_PARMRK(tty))
1da177e4
LT
761 info->read_status_mask |= UART_LSR_BI;
762
763 /*
764 * Characters to ignore
765 */
766 info->ignore_status_mask = 0;
588993dd 767 if (I_IGNPAR(tty))
1da177e4 768 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
588993dd 769 if (I_IGNBRK(tty)) {
1da177e4
LT
770 info->ignore_status_mask |= UART_LSR_BI;
771 /*
772 * If we're ignore parity and break indicators, ignore
773 * overruns too. (For real raw support).
774 */
588993dd 775 if (I_IGNPAR(tty))
1da177e4
LT
776 info->ignore_status_mask |= UART_LSR_OE;
777 }
778 /*
779 * !!! ignore all characters if CREAD is not set
780 */
781 if ((cflag & CREAD) == 0)
782 info->ignore_status_mask |= UART_LSR_DR;
783 local_irq_save(flags);
784
785 {
786 short serper;
787
788 /* Set up the baud rate */
789 serper = quot - 1;
790
791 /* Enable or disable parity bit */
792
793 if(cval & UART_LCR_PARITY)
794 serper |= (SERPER_PARENB);
795
796 custom.serper = serper;
797 mb();
798 }
799
1da177e4
LT
800 local_irq_restore(flags);
801}
802
257afa3c 803static int rs_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4 804{
916b7656 805 struct serial_state *info;
1da177e4
LT
806 unsigned long flags;
807
d9ad7ef1
TJRMI
808 info = tty->driver_data;
809
1da177e4 810 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
257afa3c 811 return 0;
1da177e4 812
d9ad7ef1 813 if (!info->xmit.buf)
257afa3c 814 return 0;
1da177e4
LT
815
816 local_irq_save(flags);
817 if (CIRC_SPACE(info->xmit.head,
818 info->xmit.tail,
819 SERIAL_XMIT_SIZE) == 0) {
820 local_irq_restore(flags);
257afa3c 821 return 0;
1da177e4
LT
822 }
823
824 info->xmit.buf[info->xmit.head++] = ch;
825 info->xmit.head &= SERIAL_XMIT_SIZE-1;
826 local_irq_restore(flags);
257afa3c 827 return 1;
1da177e4
LT
828}
829
830static void rs_flush_chars(struct tty_struct *tty)
831{
916b7656 832 struct serial_state *info = tty->driver_data;
1da177e4
LT
833 unsigned long flags;
834
835 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
836 return;
837
838 if (info->xmit.head == info->xmit.tail
839 || tty->stopped
840 || tty->hw_stopped
841 || !info->xmit.buf)
842 return;
843
844 local_irq_save(flags);
845 info->IER |= UART_IER_THRI;
846 custom.intena = IF_SETCLR | IF_TBE;
847 mb();
848 /* set a pending Tx Interrupt, transmitter should restart now */
849 custom.intreq = IF_SETCLR | IF_TBE;
850 mb();
851 local_irq_restore(flags);
852}
853
854static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
855{
856 int c, ret = 0;
916b7656 857 struct serial_state *info = tty->driver_data;
1da177e4
LT
858 unsigned long flags;
859
860 if (serial_paranoia_check(info, tty->name, "rs_write"))
861 return 0;
862
b3218a79 863 if (!info->xmit.buf)
1da177e4
LT
864 return 0;
865
3abf3bed 866 local_irq_save(flags);
1da177e4
LT
867 while (1) {
868 c = CIRC_SPACE_TO_END(info->xmit.head,
869 info->xmit.tail,
870 SERIAL_XMIT_SIZE);
871 if (count < c)
872 c = count;
873 if (c <= 0) {
874 break;
875 }
876 memcpy(info->xmit.buf + info->xmit.head, buf, c);
877 info->xmit.head = ((info->xmit.head + c) &
878 (SERIAL_XMIT_SIZE-1));
879 buf += c;
880 count -= c;
881 ret += c;
882 }
883 local_irq_restore(flags);
884
885 if (info->xmit.head != info->xmit.tail
886 && !tty->stopped
887 && !tty->hw_stopped
888 && !(info->IER & UART_IER_THRI)) {
889 info->IER |= UART_IER_THRI;
890 local_irq_disable();
891 custom.intena = IF_SETCLR | IF_TBE;
892 mb();
893 /* set a pending Tx Interrupt, transmitter should restart now */
894 custom.intreq = IF_SETCLR | IF_TBE;
895 mb();
896 local_irq_restore(flags);
897 }
898 return ret;
899}
900
901static int rs_write_room(struct tty_struct *tty)
902{
916b7656 903 struct serial_state *info = tty->driver_data;
1da177e4
LT
904
905 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
906 return 0;
907 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
908}
909
910static int rs_chars_in_buffer(struct tty_struct *tty)
911{
916b7656 912 struct serial_state *info = tty->driver_data;
1da177e4
LT
913
914 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
915 return 0;
916 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
917}
918
919static void rs_flush_buffer(struct tty_struct *tty)
920{
916b7656 921 struct serial_state *info = tty->driver_data;
1da177e4
LT
922 unsigned long flags;
923
924 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
925 return;
926 local_irq_save(flags);
927 info->xmit.head = info->xmit.tail = 0;
928 local_irq_restore(flags);
1da177e4
LT
929 tty_wakeup(tty);
930}
931
932/*
933 * This function is used to send a high-priority XON/XOFF character to
934 * the device
935 */
936static void rs_send_xchar(struct tty_struct *tty, char ch)
937{
916b7656 938 struct serial_state *info = tty->driver_data;
1da177e4
LT
939 unsigned long flags;
940
941 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
942 return;
943
944 info->x_char = ch;
945 if (ch) {
946 /* Make sure transmit interrupts are on */
947
948 /* Check this ! */
949 local_irq_save(flags);
950 if(!(custom.intenar & IF_TBE)) {
951 custom.intena = IF_SETCLR | IF_TBE;
952 mb();
953 /* set a pending Tx Interrupt, transmitter should restart now */
954 custom.intreq = IF_SETCLR | IF_TBE;
955 mb();
956 }
957 local_irq_restore(flags);
958
959 info->IER |= UART_IER_THRI;
960 }
961}
962
963/*
964 * ------------------------------------------------------------
965 * rs_throttle()
966 *
967 * This routine is called by the upper-layer tty layer to signal that
968 * incoming characters should be throttled.
969 * ------------------------------------------------------------
970 */
971static void rs_throttle(struct tty_struct * tty)
972{
916b7656 973 struct serial_state *info = tty->driver_data;
1da177e4
LT
974 unsigned long flags;
975#ifdef SERIAL_DEBUG_THROTTLE
976 char buf[64];
977
978 printk("throttle %s: %d....\n", tty_name(tty, buf),
979 tty->ldisc.chars_in_buffer(tty));
980#endif
981
982 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
983 return;
984
985 if (I_IXOFF(tty))
986 rs_send_xchar(tty, STOP_CHAR(tty));
987
988 if (tty->termios->c_cflag & CRTSCTS)
989 info->MCR &= ~SER_RTS;
990
991 local_irq_save(flags);
992 rtsdtr_ctrl(info->MCR);
993 local_irq_restore(flags);
994}
995
996static void rs_unthrottle(struct tty_struct * tty)
997{
916b7656 998 struct serial_state *info = tty->driver_data;
1da177e4
LT
999 unsigned long flags;
1000#ifdef SERIAL_DEBUG_THROTTLE
1001 char buf[64];
1002
1003 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1004 tty->ldisc.chars_in_buffer(tty));
1005#endif
1006
1007 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1008 return;
1009
1010 if (I_IXOFF(tty)) {
1011 if (info->x_char)
1012 info->x_char = 0;
1013 else
1014 rs_send_xchar(tty, START_CHAR(tty));
1015 }
1016 if (tty->termios->c_cflag & CRTSCTS)
1017 info->MCR |= SER_RTS;
1018 local_irq_save(flags);
1019 rtsdtr_ctrl(info->MCR);
1020 local_irq_restore(flags);
1021}
1022
1023/*
1024 * ------------------------------------------------------------
1025 * rs_ioctl() and friends
1026 * ------------------------------------------------------------
1027 */
1028
ff169e5c 1029static int get_serial_info(struct tty_struct *tty, struct serial_state *state,
ab14caec 1030 struct serial_struct __user * retinfo)
1da177e4
LT
1031{
1032 struct serial_struct tmp;
1da177e4
LT
1033
1034 if (!retinfo)
1035 return -EFAULT;
1036 memset(&tmp, 0, sizeof(tmp));
ec79d605 1037 tty_lock();
ff169e5c 1038 tmp.line = tty->index;
1da177e4 1039 tmp.port = state->port;
01bd730d 1040 tmp.flags = state->tport.flags;
1da177e4
LT
1041 tmp.xmit_fifo_size = state->xmit_fifo_size;
1042 tmp.baud_base = state->baud_base;
799be6ff
JS
1043 tmp.close_delay = state->tport.close_delay;
1044 tmp.closing_wait = state->tport.closing_wait;
1da177e4 1045 tmp.custom_divisor = state->custom_divisor;
ec79d605 1046 tty_unlock();
1da177e4
LT
1047 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1048 return -EFAULT;
1049 return 0;
1050}
1051
588993dd 1052static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
ab14caec 1053 struct serial_struct __user * new_info)
1da177e4 1054{
01bd730d 1055 struct tty_port *port = &state->tport;
1da177e4 1056 struct serial_struct new_serial;
0f9b9684 1057 bool change_spd;
1da177e4
LT
1058 int retval = 0;
1059
1060 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1061 return -EFAULT;
e18ce49b 1062
ec79d605 1063 tty_lock();
01bd730d 1064 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
0f9b9684 1065 new_serial.custom_divisor != state->custom_divisor;
ff169e5c 1066 if (new_serial.irq || new_serial.port != state->port ||
0f9b9684
JS
1067 new_serial.xmit_fifo_size != state->xmit_fifo_size) {
1068 tty_unlock();
1069 return -EINVAL;
e18ce49b 1070 }
1da177e4
LT
1071
1072 if (!serial_isroot()) {
1073 if ((new_serial.baud_base != state->baud_base) ||
01bd730d 1074 (new_serial.close_delay != port->close_delay) ||
1da177e4
LT
1075 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1076 ((new_serial.flags & ~ASYNC_USR_MASK) !=
01bd730d 1077 (port->flags & ~ASYNC_USR_MASK)))
1da177e4 1078 return -EPERM;
01bd730d 1079 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1da177e4 1080 (new_serial.flags & ASYNC_USR_MASK));
1da177e4
LT
1081 state->custom_divisor = new_serial.custom_divisor;
1082 goto check_and_exit;
1083 }
1084
e18ce49b 1085 if (new_serial.baud_base < 9600) {
ec79d605 1086 tty_unlock();
1da177e4 1087 return -EINVAL;
e18ce49b 1088 }
1da177e4
LT
1089
1090 /*
1091 * OK, past this point, all the error checking has been done.
1092 * At this point, we start making changes.....
1093 */
1094
1095 state->baud_base = new_serial.baud_base;
01bd730d 1096 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1da177e4 1097 (new_serial.flags & ASYNC_FLAGS));
1da177e4 1098 state->custom_divisor = new_serial.custom_divisor;
01bd730d
JS
1099 port->close_delay = new_serial.close_delay * HZ/100;
1100 port->closing_wait = new_serial.closing_wait * HZ/100;
1101 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1da177e4
LT
1102
1103check_and_exit:
01bd730d 1104 if (port->flags & ASYNC_INITIALIZED) {
0f9b9684 1105 if (change_spd) {
01bd730d 1106 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
588993dd 1107 tty->alt_speed = 57600;
01bd730d 1108 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
588993dd 1109 tty->alt_speed = 115200;
01bd730d 1110 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
588993dd 1111 tty->alt_speed = 230400;
01bd730d 1112 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
588993dd
JS
1113 tty->alt_speed = 460800;
1114 change_speed(tty, state, NULL);
1da177e4
LT
1115 }
1116 } else
588993dd 1117 retval = startup(tty, state);
ec79d605 1118 tty_unlock();
1da177e4
LT
1119 return retval;
1120}
1121
1122
1123/*
1124 * get_lsr_info - get line status register info
1125 *
1126 * Purpose: Let user call ioctl() to get info when the UART physically
1127 * is emptied. On bus types like RS485, the transmitter must
1128 * release the bus after transmitting. This must be done when
1129 * the transmit shift register is empty, not be done when the
1130 * transmit holding register is empty. This functionality
1131 * allows an RS485 driver to be written in user space.
1132 */
916b7656 1133static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1da177e4
LT
1134{
1135 unsigned char status;
1136 unsigned int result;
1137 unsigned long flags;
1138
1139 local_irq_save(flags);
1140 status = custom.serdatr;
1141 mb();
1142 local_irq_restore(flags);
1143 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1144 if (copy_to_user(value, &result, sizeof(int)))
1145 return -EFAULT;
1146 return 0;
1147}
1148
1149
60b33c13 1150static int rs_tiocmget(struct tty_struct *tty)
1da177e4 1151{
916b7656 1152 struct serial_state *info = tty->driver_data;
1da177e4
LT
1153 unsigned char control, status;
1154 unsigned long flags;
1155
1156 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1157 return -ENODEV;
1158 if (tty->flags & (1 << TTY_IO_ERROR))
1159 return -EIO;
1160
1161 control = info->MCR;
1162 local_irq_save(flags);
1163 status = ciab.pra;
1164 local_irq_restore(flags);
1165 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1166 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1167 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1168 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1169 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1170}
1171
20b9d177
AC
1172static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1173 unsigned int clear)
1da177e4 1174{
916b7656 1175 struct serial_state *info = tty->driver_data;
1da177e4
LT
1176 unsigned long flags;
1177
1178 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1179 return -ENODEV;
1180 if (tty->flags & (1 << TTY_IO_ERROR))
1181 return -EIO;
1182
1183 local_irq_save(flags);
1184 if (set & TIOCM_RTS)
1185 info->MCR |= SER_RTS;
1186 if (set & TIOCM_DTR)
1187 info->MCR |= SER_DTR;
1188 if (clear & TIOCM_RTS)
1189 info->MCR &= ~SER_RTS;
1190 if (clear & TIOCM_DTR)
1191 info->MCR &= ~SER_DTR;
1192 rtsdtr_ctrl(info->MCR);
1193 local_irq_restore(flags);
1194 return 0;
1195}
1196
1197/*
1198 * rs_break() --- routine which turns the break handling on or off
1199 */
9e98966c 1200static int rs_break(struct tty_struct *tty, int break_state)
1da177e4 1201{
916b7656 1202 struct serial_state *info = tty->driver_data;
1da177e4
LT
1203 unsigned long flags;
1204
1205 if (serial_paranoia_check(info, tty->name, "rs_break"))
970a8a51 1206 return -EINVAL;
1da177e4
LT
1207
1208 local_irq_save(flags);
1209 if (break_state == -1)
1210 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1211 else
1212 custom.adkcon = AC_UARTBRK;
1213 mb();
1214 local_irq_restore(flags);
9e98966c 1215 return 0;
1da177e4
LT
1216}
1217
0587102c
AC
1218/*
1219 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1220 * Return: write counters to the user passed counter struct
1221 * NB: both 1->0 and 0->1 transitions are counted except for
1222 * RI where only 0->1 is counted.
1223 */
1224static int rs_get_icount(struct tty_struct *tty,
1225 struct serial_icounter_struct *icount)
1226{
916b7656 1227 struct serial_state *info = tty->driver_data;
0587102c
AC
1228 struct async_icount cnow;
1229 unsigned long flags;
1230
1231 local_irq_save(flags);
916b7656 1232 cnow = info->icount;
0587102c
AC
1233 local_irq_restore(flags);
1234 icount->cts = cnow.cts;
1235 icount->dsr = cnow.dsr;
1236 icount->rng = cnow.rng;
1237 icount->dcd = cnow.dcd;
1238 icount->rx = cnow.rx;
1239 icount->tx = cnow.tx;
1240 icount->frame = cnow.frame;
1241 icount->overrun = cnow.overrun;
1242 icount->parity = cnow.parity;
1243 icount->brk = cnow.brk;
1244 icount->buf_overrun = cnow.buf_overrun;
1245
1246 return 0;
1247}
1da177e4 1248
6caa76b7 1249static int rs_ioctl(struct tty_struct *tty,
1da177e4
LT
1250 unsigned int cmd, unsigned long arg)
1251{
916b7656 1252 struct serial_state *info = tty->driver_data;
1da177e4 1253 struct async_icount cprev, cnow; /* kernel counter temps */
ab14caec 1254 void __user *argp = (void __user *)arg;
1da177e4
LT
1255 unsigned long flags;
1256
1257 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1258 return -ENODEV;
1259
1260 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1261 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1262 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1263 if (tty->flags & (1 << TTY_IO_ERROR))
1264 return -EIO;
1265 }
1266
1267 switch (cmd) {
1268 case TIOCGSERIAL:
ff169e5c 1269 return get_serial_info(tty, info, argp);
1da177e4 1270 case TIOCSSERIAL:
588993dd 1271 return set_serial_info(tty, info, argp);
1da177e4
LT
1272 case TIOCSERCONFIG:
1273 return 0;
1274
1275 case TIOCSERGETLSR: /* Get line status register */
ab14caec 1276 return get_lsr_info(info, argp);
1da177e4
LT
1277
1278 case TIOCSERGSTRUCT:
ab14caec 1279 if (copy_to_user(argp,
916b7656 1280 info, sizeof(struct serial_state)))
1da177e4
LT
1281 return -EFAULT;
1282 return 0;
1283
1284 /*
1285 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1286 * - mask passed in arg for lines of interest
1287 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1288 * Caller should use TIOCGICOUNT to see which one it was
1289 */
1290 case TIOCMIWAIT:
1291 local_irq_save(flags);
1292 /* note the counters on entry */
916b7656 1293 cprev = info->icount;
1da177e4
LT
1294 local_irq_restore(flags);
1295 while (1) {
87758791 1296 interruptible_sleep_on(&info->tport.delta_msr_wait);
1da177e4
LT
1297 /* see if a signal did it */
1298 if (signal_pending(current))
1299 return -ERESTARTSYS;
1300 local_irq_save(flags);
916b7656 1301 cnow = info->icount; /* atomic copy */
1da177e4
LT
1302 local_irq_restore(flags);
1303 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1304 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1305 return -EIO; /* no change => error */
1306 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1307 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1308 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1309 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1310 return 0;
1311 }
1312 cprev = cnow;
1313 }
1314 /* NOTREACHED */
1315
1da177e4
LT
1316 case TIOCSERGWILD:
1317 case TIOCSERSWILD:
1318 /* "setserial -W" is called in Debian boot */
1319 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1320 return 0;
1321
1322 default:
1323 return -ENOIOCTLCMD;
1324 }
1325 return 0;
1326}
1327
606d099c 1328static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1da177e4 1329{
916b7656 1330 struct serial_state *info = tty->driver_data;
1da177e4
LT
1331 unsigned long flags;
1332 unsigned int cflag = tty->termios->c_cflag;
1333
588993dd 1334 change_speed(tty, info, old_termios);
1da177e4
LT
1335
1336 /* Handle transition to B0 status */
1337 if ((old_termios->c_cflag & CBAUD) &&
1338 !(cflag & CBAUD)) {
1339 info->MCR &= ~(SER_DTR|SER_RTS);
1340 local_irq_save(flags);
1341 rtsdtr_ctrl(info->MCR);
1342 local_irq_restore(flags);
1343 }
1344
1345 /* Handle transition away from B0 status */
1346 if (!(old_termios->c_cflag & CBAUD) &&
1347 (cflag & CBAUD)) {
1348 info->MCR |= SER_DTR;
1349 if (!(tty->termios->c_cflag & CRTSCTS) ||
1350 !test_bit(TTY_THROTTLED, &tty->flags)) {
1351 info->MCR |= SER_RTS;
1352 }
1353 local_irq_save(flags);
1354 rtsdtr_ctrl(info->MCR);
1355 local_irq_restore(flags);
1356 }
1357
1358 /* Handle turning off CRTSCTS */
1359 if ((old_termios->c_cflag & CRTSCTS) &&
1360 !(tty->termios->c_cflag & CRTSCTS)) {
1361 tty->hw_stopped = 0;
1362 rs_start(tty);
1363 }
1364
1365#if 0
1366 /*
1367 * No need to wake up processes in open wait, since they
1368 * sample the CLOCAL flag once, and don't recheck it.
1369 * XXX It's not clear whether the current behavior is correct
1370 * or not. Hence, this may change.....
1371 */
1372 if (!(old_termios->c_cflag & CLOCAL) &&
1373 (tty->termios->c_cflag & CLOCAL))
1374 wake_up_interruptible(&info->open_wait);
1375#endif
1376}
1377
1378/*
1379 * ------------------------------------------------------------
1380 * rs_close()
1381 *
1382 * This routine is called when the serial port gets closed. First, we
1383 * wait for the last remaining data to be sent. Then, we unlink its
1384 * async structure from the interrupt chain if necessary, and we free
1385 * that IRQ if nothing is left in the chain.
1386 * ------------------------------------------------------------
1387 */
1388static void rs_close(struct tty_struct *tty, struct file * filp)
1389{
916b7656 1390 struct serial_state *state = tty->driver_data;
7188dc20 1391 struct tty_port *port = &state->tport;
1da177e4
LT
1392 unsigned long flags;
1393
916b7656 1394 if (!state || serial_paranoia_check(state, tty->name, "rs_close"))
1da177e4
LT
1395 return;
1396
1da177e4
LT
1397 local_irq_save(flags);
1398
1399 if (tty_hung_up_p(filp)) {
1400 DBG_CNT("before DEC-hung");
1401 local_irq_restore(flags);
1402 return;
1403 }
1404
1405#ifdef SERIAL_DEBUG_OPEN
7188dc20 1406 printk("rs_close ttys%d, count = %d\n", state->line, port->count);
1da177e4 1407#endif
7188dc20 1408 if ((tty->count == 1) && (port->count != 1)) {
1da177e4
LT
1409 /*
1410 * Uh, oh. tty->count is 1, which means that the tty
7188dc20 1411 * structure will be freed. port->count should always
1da177e4
LT
1412 * be one in these conditions. If it's greater than
1413 * one, we've got real problems, since it means the
1414 * serial port won't be shutdown.
1415 */
1416 printk("rs_close: bad serial port count; tty->count is 1, "
7188dc20
JS
1417 "port->count is %d\n", state->tport.count);
1418 port->count = 1;
1da177e4 1419 }
7188dc20 1420 if (--port->count < 0) {
1da177e4 1421 printk("rs_close: bad serial port count for ttys%d: %d\n",
ff169e5c 1422 tty->index, port->count);
7188dc20 1423 port->count = 0;
1da177e4 1424 }
7188dc20 1425 if (port->count) {
1da177e4
LT
1426 DBG_CNT("before DEC-2");
1427 local_irq_restore(flags);
1428 return;
1429 }
7188dc20 1430 port->flags |= ASYNC_CLOSING;
1da177e4
LT
1431 /*
1432 * Now we wait for the transmit buffer to clear; and we notify
1433 * the line discipline to only process XON/XOFF characters.
1434 */
1435 tty->closing = 1;
7188dc20
JS
1436 if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1437 tty_wait_until_sent(tty, port->closing_wait);
1da177e4
LT
1438 /*
1439 * At this point we stop accepting input. To do this, we
1440 * disable the receive line status interrupts, and tell the
1441 * interrupt driver to stop checking the data ready bit in the
1442 * line status register.
1443 */
916b7656 1444 state->read_status_mask &= ~UART_LSR_DR;
7188dc20 1445 if (port->flags & ASYNC_INITIALIZED) {
1da177e4
LT
1446 /* disable receive interrupts */
1447 custom.intena = IF_RBF;
1448 mb();
1449 /* clear any pending receive interrupt */
1450 custom.intreq = IF_RBF;
1451 mb();
1452
1453 /*
1454 * Before we drop DTR, make sure the UART transmitter
1455 * has completely drained; this is especially
1456 * important if there is a transmit FIFO!
1457 */
916b7656 1458 rs_wait_until_sent(tty, state->timeout);
1da177e4 1459 }
588993dd 1460 shutdown(tty, state);
978e595f 1461 rs_flush_buffer(tty);
1da177e4
LT
1462
1463 tty_ldisc_flush(tty);
1464 tty->closing = 0;
7188dc20
JS
1465 port->tty = NULL;
1466 if (port->blocked_open) {
1467 if (port->close_delay) {
1468 msleep_interruptible(jiffies_to_msecs(port->close_delay));
1da177e4 1469 }
7188dc20 1470 wake_up_interruptible(&port->open_wait);
1da177e4 1471 }
7188dc20
JS
1472 port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1473 wake_up_interruptible(&port->close_wait);
1da177e4
LT
1474 local_irq_restore(flags);
1475}
1476
1477/*
1478 * rs_wait_until_sent() --- wait until the transmitter is empty
1479 */
1480static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1481{
916b7656 1482 struct serial_state *info = tty->driver_data;
1da177e4
LT
1483 unsigned long orig_jiffies, char_time;
1484 int lsr;
1485
1486 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1487 return;
1488
916b7656 1489 if (info->xmit_fifo_size == 0)
1da177e4
LT
1490 return; /* Just in case.... */
1491
1492 orig_jiffies = jiffies;
978e595f 1493
1da177e4
LT
1494 /*
1495 * Set the check interval to be 1/5 of the estimated time to
1496 * send a single character, and make it at least 1. The check
1497 * interval should also be less than the timeout.
1498 *
1499 * Note: we have to use pretty tight timings here to satisfy
1500 * the NIST-PCTS.
1501 */
916b7656 1502 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1da177e4
LT
1503 char_time = char_time / 5;
1504 if (char_time == 0)
1505 char_time = 1;
1506 if (timeout)
1507 char_time = min_t(unsigned long, char_time, timeout);
1508 /*
1509 * If the transmitter hasn't cleared in twice the approximate
1510 * amount of time to send the entire FIFO, it probably won't
1511 * ever clear. This assumes the UART isn't doing flow
1512 * control, which is currently the case. Hence, if it ever
1513 * takes longer than info->timeout, this is probably due to a
1514 * UART bug of some kind. So, we clamp the timeout parameter at
1515 * 2*info->timeout.
1516 */
1517 if (!timeout || timeout > 2*info->timeout)
1518 timeout = 2*info->timeout;
1519#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1520 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1521 printk("jiff=%lu...", jiffies);
1522#endif
1523 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1524#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1525 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1526#endif
1527 msleep_interruptible(jiffies_to_msecs(char_time));
1528 if (signal_pending(current))
1529 break;
1530 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1531 break;
1532 }
cc0a8fbb 1533 __set_current_state(TASK_RUNNING);
eff4b0b9 1534
1da177e4
LT
1535#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1536 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1537#endif
1538}
1539
1540/*
1541 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1542 */
1543static void rs_hangup(struct tty_struct *tty)
1544{
916b7656 1545 struct serial_state *info = tty->driver_data;
1da177e4
LT
1546
1547 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1548 return;
1549
1da177e4 1550 rs_flush_buffer(tty);
588993dd 1551 shutdown(tty, info);
12c80354 1552 info->tport.count = 0;
01bd730d 1553 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
87758791
JS
1554 info->tport.tty = NULL;
1555 wake_up_interruptible(&info->tport.open_wait);
1da177e4
LT
1556}
1557
1558/*
1559 * ------------------------------------------------------------
1560 * rs_open() and friends
1561 * ------------------------------------------------------------
1562 */
1563static int block_til_ready(struct tty_struct *tty, struct file * filp,
916b7656 1564 struct serial_state *info)
1da177e4
LT
1565{
1566#ifdef DECLARE_WAITQUEUE
1567 DECLARE_WAITQUEUE(wait, current);
1568#else
1569 struct wait_queue wait = { current, NULL };
1570#endif
01bd730d 1571 struct tty_port *port = &info->tport;
1da177e4
LT
1572 int retval;
1573 int do_clocal = 0, extra_count = 0;
1574 unsigned long flags;
1575
1576 /*
1577 * If the device is in the middle of being closed, then block
1578 * until it's done, and then try again.
1579 */
1580 if (tty_hung_up_p(filp) ||
01bd730d
JS
1581 (port->flags & ASYNC_CLOSING)) {
1582 if (port->flags & ASYNC_CLOSING)
1583 interruptible_sleep_on(&port->close_wait);
1da177e4 1584#ifdef SERIAL_DO_RESTART
01bd730d 1585 return ((port->flags & ASYNC_HUP_NOTIFY) ?
1da177e4
LT
1586 -EAGAIN : -ERESTARTSYS);
1587#else
1588 return -EAGAIN;
1589#endif
1590 }
1591
1592 /*
1593 * If non-blocking mode is set, or the port is not enabled,
1594 * then make the check up front and then exit.
1595 */
1596 if ((filp->f_flags & O_NONBLOCK) ||
1597 (tty->flags & (1 << TTY_IO_ERROR))) {
01bd730d 1598 port->flags |= ASYNC_NORMAL_ACTIVE;
1da177e4
LT
1599 return 0;
1600 }
1601
1602 if (tty->termios->c_cflag & CLOCAL)
1603 do_clocal = 1;
1604
1605 /*
1606 * Block waiting for the carrier detect and the line to become
1607 * free (i.e., not in use by the callout). While we are in
01bd730d 1608 * this loop, port->count is dropped by one, so that
1da177e4
LT
1609 * rs_close() knows when to free things. We restore it upon
1610 * exit, either normal or abnormal.
1611 */
1612 retval = 0;
01bd730d 1613 add_wait_queue(&port->open_wait, &wait);
1da177e4
LT
1614#ifdef SERIAL_DEBUG_OPEN
1615 printk("block_til_ready before block: ttys%d, count = %d\n",
01bd730d 1616 info->line, port->count);
1da177e4
LT
1617#endif
1618 local_irq_save(flags);
1619 if (!tty_hung_up_p(filp)) {
1620 extra_count = 1;
01bd730d 1621 port->count--;
1da177e4
LT
1622 }
1623 local_irq_restore(flags);
01bd730d 1624 port->blocked_open++;
1da177e4 1625 while (1) {
1da177e4 1626 if (tty->termios->c_cflag & CBAUD)
f1166604 1627 tty_port_raise_dtr_rts(port);
1da177e4
LT
1628 set_current_state(TASK_INTERRUPTIBLE);
1629 if (tty_hung_up_p(filp) ||
01bd730d 1630 !(port->flags & ASYNC_INITIALIZED)) {
1da177e4 1631#ifdef SERIAL_DO_RESTART
01bd730d 1632 if (port->flags & ASYNC_HUP_NOTIFY)
1da177e4
LT
1633 retval = -EAGAIN;
1634 else
1635 retval = -ERESTARTSYS;
1636#else
1637 retval = -EAGAIN;
1638#endif
1639 break;
1640 }
01bd730d 1641 if (!(port->flags & ASYNC_CLOSING) &&
f1166604 1642 (do_clocal || tty_port_carrier_raised(port)))
1da177e4
LT
1643 break;
1644 if (signal_pending(current)) {
1645 retval = -ERESTARTSYS;
1646 break;
1647 }
1648#ifdef SERIAL_DEBUG_OPEN
1649 printk("block_til_ready blocking: ttys%d, count = %d\n",
01bd730d 1650 info->line, port->count);
1da177e4 1651#endif
e142a31d 1652 tty_unlock();
1da177e4 1653 schedule();
e142a31d 1654 tty_lock();
1da177e4 1655 }
cc0a8fbb 1656 __set_current_state(TASK_RUNNING);
01bd730d 1657 remove_wait_queue(&port->open_wait, &wait);
1da177e4 1658 if (extra_count)
01bd730d
JS
1659 port->count++;
1660 port->blocked_open--;
1da177e4
LT
1661#ifdef SERIAL_DEBUG_OPEN
1662 printk("block_til_ready after blocking: ttys%d, count = %d\n",
01bd730d 1663 info->line, port->count);
1da177e4
LT
1664#endif
1665 if (retval)
1666 return retval;
01bd730d 1667 port->flags |= ASYNC_NORMAL_ACTIVE;
1da177e4
LT
1668 return 0;
1669}
1670
1671/*
1672 * This routine is called whenever a serial port is opened. It
1673 * enables interrupts for a serial port, linking in its async structure into
1674 * the IRQ chain. It also performs the serial-specific
1675 * initialization for the tty structure.
1676 */
1677static int rs_open(struct tty_struct *tty, struct file * filp)
1678{
916b7656 1679 struct serial_state *info = rs_table + tty->index;
7188dc20 1680 struct tty_port *port = &info->tport;
410235fd 1681 int retval;
1da177e4 1682
7188dc20
JS
1683 port->count++;
1684 port->tty = tty;
916b7656 1685 tty->driver_data = info;
7188dc20 1686 tty->port = port;
1da177e4
LT
1687 if (serial_paranoia_check(info, tty->name, "rs_open"))
1688 return -ENODEV;
1689
1690#ifdef SERIAL_DEBUG_OPEN
916b7656 1691 printk("rs_open %s, count = %d\n", tty->name, info->count);
1da177e4 1692#endif
7188dc20 1693 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1da177e4 1694
1da177e4
LT
1695 /*
1696 * If the port is the middle of closing, bail out now
1697 */
1698 if (tty_hung_up_p(filp) ||
7188dc20
JS
1699 (port->flags & ASYNC_CLOSING)) {
1700 if (port->flags & ASYNC_CLOSING)
1701 interruptible_sleep_on(&port->close_wait);
1da177e4 1702#ifdef SERIAL_DO_RESTART
7188dc20 1703 return ((port->flags & ASYNC_HUP_NOTIFY) ?
1da177e4
LT
1704 -EAGAIN : -ERESTARTSYS);
1705#else
1706 return -EAGAIN;
1707#endif
1708 }
1709
1710 /*
1711 * Start up serial port
1712 */
588993dd 1713 retval = startup(tty, info);
1da177e4
LT
1714 if (retval) {
1715 return retval;
1716 }
1717
1718 retval = block_til_ready(tty, filp, info);
1719 if (retval) {
1720#ifdef SERIAL_DEBUG_OPEN
1721 printk("rs_open returning after block_til_ready with %d\n",
1722 retval);
1723#endif
1724 return retval;
1725 }
1726
1727#ifdef SERIAL_DEBUG_OPEN
1728 printk("rs_open %s successful...", tty->name);
1729#endif
1730 return 0;
1731}
1732
1733/*
1734 * /proc fs routines....
1735 */
1736
ff169e5c
JS
1737static inline void line_info(struct seq_file *m, int line,
1738 struct serial_state *state)
1da177e4 1739{
1da177e4 1740 char stat_buf[30], control, status;
1da177e4
LT
1741 unsigned long flags;
1742
ff169e5c 1743 seq_printf(m, "%d: uart:amiga_builtin", line);
1da177e4 1744
1da177e4
LT
1745 local_irq_save(flags);
1746 status = ciab.pra;
01bd730d 1747 control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status;
1da177e4
LT
1748 local_irq_restore(flags);
1749
1750 stat_buf[0] = 0;
1751 stat_buf[1] = 0;
1752 if(!(control & SER_RTS))
1753 strcat(stat_buf, "|RTS");
1754 if(!(status & SER_CTS))
1755 strcat(stat_buf, "|CTS");
1756 if(!(control & SER_DTR))
1757 strcat(stat_buf, "|DTR");
1758 if(!(status & SER_DSR))
1759 strcat(stat_buf, "|DSR");
1760 if(!(status & SER_DCD))
1761 strcat(stat_buf, "|CD");
1762
916b7656
JS
1763 if (state->quot)
1764 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1da177e4 1765
d594027d 1766 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1da177e4
LT
1767
1768 if (state->icount.frame)
d594027d 1769 seq_printf(m, " fe:%d", state->icount.frame);
1da177e4
LT
1770
1771 if (state->icount.parity)
d594027d 1772 seq_printf(m, " pe:%d", state->icount.parity);
1da177e4
LT
1773
1774 if (state->icount.brk)
d594027d 1775 seq_printf(m, " brk:%d", state->icount.brk);
1da177e4
LT
1776
1777 if (state->icount.overrun)
d594027d 1778 seq_printf(m, " oe:%d", state->icount.overrun);
1da177e4
LT
1779
1780 /*
1781 * Last thing is the RS-232 status lines
1782 */
d594027d 1783 seq_printf(m, " %s\n", stat_buf+1);
1da177e4
LT
1784}
1785
d594027d 1786static int rs_proc_show(struct seq_file *m, void *v)
1da177e4 1787{
d594027d 1788 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
ff169e5c 1789 line_info(m, 0, &rs_table[0]);
d594027d 1790 return 0;
1da177e4
LT
1791}
1792
d594027d
AD
1793static int rs_proc_open(struct inode *inode, struct file *file)
1794{
1795 return single_open(file, rs_proc_show, NULL);
1796}
1797
1798static const struct file_operations rs_proc_fops = {
1799 .owner = THIS_MODULE,
1800 .open = rs_proc_open,
1801 .read = seq_read,
1802 .llseek = seq_lseek,
1803 .release = single_release,
1804};
1805
1da177e4
LT
1806/*
1807 * ---------------------------------------------------------------------
1808 * rs_init() and friends
1809 *
1810 * rs_init() is called at boot-time to initialize the serial driver.
1811 * ---------------------------------------------------------------------
1812 */
1813
1814/*
1815 * This routine prints out the appropriate serial driver version
1816 * number, and identifies which options were configured into this
1817 * driver.
1818 */
41c28ff1 1819static void show_serial_version(void)
1da177e4
LT
1820{
1821 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1822}
1823
1824
b68e31d0 1825static const struct tty_operations serial_ops = {
1da177e4
LT
1826 .open = rs_open,
1827 .close = rs_close,
1828 .write = rs_write,
1829 .put_char = rs_put_char,
1830 .flush_chars = rs_flush_chars,
1831 .write_room = rs_write_room,
1832 .chars_in_buffer = rs_chars_in_buffer,
1833 .flush_buffer = rs_flush_buffer,
1834 .ioctl = rs_ioctl,
1835 .throttle = rs_throttle,
1836 .unthrottle = rs_unthrottle,
1837 .set_termios = rs_set_termios,
1838 .stop = rs_stop,
1839 .start = rs_start,
1840 .hangup = rs_hangup,
1841 .break_ctl = rs_break,
1842 .send_xchar = rs_send_xchar,
1843 .wait_until_sent = rs_wait_until_sent,
1da177e4
LT
1844 .tiocmget = rs_tiocmget,
1845 .tiocmset = rs_tiocmset,
0587102c 1846 .get_icount = rs_get_icount,
d594027d 1847 .proc_fops = &rs_proc_fops,
1da177e4
LT
1848};
1849
f1166604
JS
1850static int amiga_carrier_raised(struct tty_port *port)
1851{
1852 return !(ciab.pra & SER_DCD);
1853}
1854
1855static void amiga_dtr_rts(struct tty_port *port, int raise)
1856{
1857 struct serial_state *info = container_of(port, struct serial_state,
1858 tport);
1859 unsigned long flags;
1860
1861 if (raise)
1862 info->MCR |= SER_DTR|SER_RTS;
1863 else
1864 info->MCR &= ~(SER_DTR|SER_RTS);
1865
1866 local_irq_save(flags);
1867 rtsdtr_ctrl(info->MCR);
1868 local_irq_restore(flags);
1869}
1870
1871static const struct tty_port_operations amiga_port_ops = {
1872 .carrier_raised = amiga_carrier_raised,
1873 .dtr_rts = amiga_dtr_rts,
1874};
1875
1da177e4
LT
1876/*
1877 * The serial driver boot-time initialization code!
1878 */
826e8c8c 1879static int __init amiga_serial_probe(struct platform_device *pdev)
1da177e4
LT
1880{
1881 unsigned long flags;
1882 struct serial_state * state;
5edc304f 1883 int error;
1da177e4 1884
410235fd 1885 serial_driver = alloc_tty_driver(NR_PORTS);
1da177e4
LT
1886 if (!serial_driver)
1887 return -ENOMEM;
1888
1da177e4
LT
1889 show_serial_version();
1890
1891 /* Initialize the tty_driver structure */
1892
1da177e4
LT
1893 serial_driver->driver_name = "amiserial";
1894 serial_driver->name = "ttyS";
1895 serial_driver->major = TTY_MAJOR;
1896 serial_driver->minor_start = 64;
1897 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1898 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1899 serial_driver->init_termios = tty_std_termios;
1900 serial_driver->init_termios.c_cflag =
1901 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1902 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1903 tty_set_operations(serial_driver, &serial_ops);
1904
5edc304f
GU
1905 error = tty_register_driver(serial_driver);
1906 if (error)
826e8c8c 1907 goto fail_put_tty_driver;
1da177e4
LT
1908
1909 state = rs_table;
1da177e4 1910 state->port = (int)&custom.serdatr; /* Just to give it a value */
1da177e4 1911 state->custom_divisor = 0;
1da177e4
LT
1912 state->icount.cts = state->icount.dsr =
1913 state->icount.rng = state->icount.dcd = 0;
1914 state->icount.rx = state->icount.tx = 0;
1915 state->icount.frame = state->icount.parity = 0;
1916 state->icount.overrun = state->icount.brk = 0;
87758791 1917 tty_port_init(&state->tport);
f1166604 1918 state->tport.ops = &amiga_port_ops;
1da177e4 1919
ff169e5c 1920 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1da177e4
LT
1921
1922 /* Hardware set up */
1923
1924 state->baud_base = amiga_colorclock;
1925 state->xmit_fifo_size = 1;
1926
1da177e4 1927 /* set ISRs, and then disable the rx interrupts */
5edc304f
GU
1928 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1929 if (error)
1930 goto fail_unregister;
1931
9cfb5c05 1932 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
5edc304f
GU
1933 "serial RX", state);
1934 if (error)
1935 goto fail_free_irq;
1da177e4 1936
c70c036f
JL
1937 local_irq_save(flags);
1938
1da177e4
LT
1939 /* turn off Rx and Tx interrupts */
1940 custom.intena = IF_RBF | IF_TBE;
1941 mb();
1942
1943 /* clear any pending interrupt */
1944 custom.intreq = IF_RBF | IF_TBE;
1945 mb();
1946
1947 local_irq_restore(flags);
1948
1949 /*
1950 * set the appropriate directions for the modem control flags,
1951 * and clear RTS and DTR
1952 */
1953 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1954 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1955
826e8c8c
GU
1956 platform_set_drvdata(pdev, state);
1957
1da177e4 1958 return 0;
5edc304f
GU
1959
1960fail_free_irq:
1961 free_irq(IRQ_AMIGA_TBE, state);
1962fail_unregister:
1963 tty_unregister_driver(serial_driver);
5edc304f
GU
1964fail_put_tty_driver:
1965 put_tty_driver(serial_driver);
1966 return error;
1da177e4
LT
1967}
1968
826e8c8c 1969static int __exit amiga_serial_remove(struct platform_device *pdev)
1da177e4
LT
1970{
1971 int error;
826e8c8c 1972 struct serial_state *state = platform_get_drvdata(pdev);
1da177e4
LT
1973
1974 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1da177e4
LT
1975 if ((error = tty_unregister_driver(serial_driver)))
1976 printk("SERIAL: failed to unregister serial driver (%d)\n",
1977 error);
1978 put_tty_driver(serial_driver);
1979
916b7656
JS
1980 free_irq(IRQ_AMIGA_TBE, state);
1981 free_irq(IRQ_AMIGA_RBF, state);
5edc304f 1982
826e8c8c
GU
1983 platform_set_drvdata(pdev, NULL);
1984
1985 return error;
1986}
1987
1988static struct platform_driver amiga_serial_driver = {
1989 .remove = __exit_p(amiga_serial_remove),
1990 .driver = {
1991 .name = "amiga-serial",
1992 .owner = THIS_MODULE,
1993 },
1994};
1995
1996static int __init amiga_serial_init(void)
1997{
1998 return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
1999}
2000
2001module_init(amiga_serial_init);
2002
2003static void __exit amiga_serial_exit(void)
2004{
2005 platform_driver_unregister(&amiga_serial_driver);
1da177e4
LT
2006}
2007
826e8c8c 2008module_exit(amiga_serial_exit);
1da177e4
LT
2009
2010
d1a35e4d
GU
2011#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2012
1da177e4
LT
2013/*
2014 * ------------------------------------------------------------
2015 * Serial console driver
2016 * ------------------------------------------------------------
2017 */
1da177e4
LT
2018
2019static void amiga_serial_putc(char c)
2020{
2021 custom.serdat = (unsigned char)c | 0x100;
2022 while (!(custom.serdatr & 0x2000))
2023 barrier();
2024}
2025
2026/*
2027 * Print a string to the serial port trying not to disturb
2028 * any possible real use of the port...
2029 *
2030 * The console must be locked when we get here.
2031 */
2032static void serial_console_write(struct console *co, const char *s,
2033 unsigned count)
2034{
2035 unsigned short intena = custom.intenar;
2036
2037 custom.intena = IF_TBE;
2038
2039 while (count--) {
2040 if (*s == '\n')
2041 amiga_serial_putc('\r');
2042 amiga_serial_putc(*s++);
2043 }
2044
2045 custom.intena = IF_SETCLR | (intena & IF_TBE);
2046}
2047
2048static struct tty_driver *serial_console_device(struct console *c, int *index)
2049{
2050 *index = 0;
2051 return serial_driver;
2052}
2053
2054static struct console sercons = {
2055 .name = "ttyS",
2056 .write = serial_console_write,
2057 .device = serial_console_device,
2058 .flags = CON_PRINTBUFFER,
2059 .index = -1,
2060};
2061
2062/*
2063 * Register console.
2064 */
2065static int __init amiserial_console_init(void)
2066{
2067 register_console(&sercons);
2068 return 0;
2069}
2070console_initcall(amiserial_console_init);
d1a35e4d
GU
2071
2072#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1da177e4
LT
2073
2074MODULE_LICENSE("GPL");
826e8c8c 2075MODULE_ALIAS("platform:amiga-serial");
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