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headers: smp_lock.h redux
[linux-block.git] / drivers / char / amiserial.c
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1da177e4
LT		 1/*
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
1da177e4
LT		 34#include <linux/delay.h>
35
36#undef SERIAL_PARANOIA_CHECK
37#define SERIAL_DO_RESTART
38
39/* Set of debugging defines */
40
41#undef SERIAL_DEBUG_INTR
42#undef SERIAL_DEBUG_OPEN
43#undef SERIAL_DEBUG_FLOW
44#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
45
46/* Sanity checks */
47
1da177e4
LT		 48#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
49#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
50 tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
51#else
52#define DBG_CNT(s)
53#endif
54
55/*
56 * End of serial driver configuration section.
57 */
58
59#include <linux/module.h>
60
61#include <linux/types.h>
62#include <linux/serial.h>
63#include <linux/serialP.h>
64#include <linux/serial_reg.h>
65static char *serial_version = "4.30";
66
67#include <linux/errno.h>
68#include <linux/signal.h>
69#include <linux/sched.h>
70#include <linux/kernel.h>
71#include <linux/timer.h>
72#include <linux/interrupt.h>
73#include <linux/tty.h>
74#include <linux/tty_flip.h>
75#include <linux/console.h>
76#include <linux/major.h>
77#include <linux/string.h>
78#include <linux/fcntl.h>
79#include <linux/ptrace.h>
80#include <linux/ioport.h>
81#include <linux/mm.h>
d594027d 82#include <linux/seq_file.h>
1da177e4 83#include <linux/slab.h>
405f5571 84#include <linux/smp_lock.h>
1da177e4
LT		 85#include <linux/init.h>
86#include <linux/bitops.h>
87
88#include <asm/setup.h>
89
90#include <asm/system.h>
91
92#include <asm/irq.h>
93
94#include <asm/amigahw.h>
95#include <asm/amigaints.h>
96
b4290a23 97#define custom amiga_custom
1da177e4
LT		 98static char *serial_name = "Amiga-builtin serial driver";
99
100static struct tty_driver *serial_driver;
101
102/* number of characters left in xmit buffer before we ask for more */
103#define WAKEUP_CHARS 256
104
105static struct async_struct *IRQ_ports;
106
107static unsigned char current_ctl_bits;
108
606d099c 109static void change_speed(struct async_struct *info, struct ktermios *old);
1da177e4
LT		 110static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
111
112
113static struct serial_state rs_table[1];
114
fe971071 115#define NR_PORTS ARRAY_SIZE(rs_table)
1da177e4 116
1da177e4
LT		 117#include <asm/uaccess.h>
118
119#define serial_isroot() (capable(CAP_SYS_ADMIN))
120
121
122static inline int serial_paranoia_check(struct async_struct *info,
123 char *name, const char *routine)
124{
125#ifdef SERIAL_PARANOIA_CHECK
126 static const char *badmagic =
127 "Warning: bad magic number for serial struct (%s) in %s\n";
128 static const char *badinfo =
129 "Warning: null async_struct for (%s) in %s\n";
130
131 if (!info) {
132 printk(badinfo, name, routine);
133 return 1;
134 }
135 if (info->magic != SERIAL_MAGIC) {
136 printk(badmagic, name, routine);
137 return 1;
138 }
139#endif
140 return 0;
141}
142
143/* some serial hardware definitions */
144#define SDR_OVRUN (1<<15)
145#define SDR_RBF (1<<14)
146#define SDR_TBE (1<<13)
147#define SDR_TSRE (1<<12)
148
149#define SERPER_PARENB (1<<15)
150
151#define AC_SETCLR (1<<15)
152#define AC_UARTBRK (1<<11)
153
154#define SER_DTR (1<<7)
155#define SER_RTS (1<<6)
156#define SER_DCD (1<<5)
157#define SER_CTS (1<<4)
158#define SER_DSR (1<<3)
159
160static __inline__ void rtsdtr_ctrl(int bits)
161{
162 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
163}
164
165/*
166 * ------------------------------------------------------------
167 * rs_stop() and rs_start()
168 *
169 * This routines are called before setting or resetting tty->stopped.
170 * They enable or disable transmitter interrupts, as necessary.
171 * ------------------------------------------------------------
172 */
173static void rs_stop(struct tty_struct *tty)
174{
c9f19e96 175 struct async_struct *info = tty->driver_data;
1da177e4
LT		 176 unsigned long flags;
177
178 if (serial_paranoia_check(info, tty->name, "rs_stop"))
179 return;
180
181 local_irq_save(flags);
182 if (info->IER & UART_IER_THRI) {
183 info->IER &= ~UART_IER_THRI;
184 /* disable Tx interrupt and remove any pending interrupts */
185 custom.intena = IF_TBE;
186 mb();
187 custom.intreq = IF_TBE;
188 mb();
189 }
190 local_irq_restore(flags);
191}
192
193static void rs_start(struct tty_struct *tty)
194{
c9f19e96 195 struct async_struct *info = tty->driver_data;
1da177e4
LT		 196 unsigned long flags;
197
198 if (serial_paranoia_check(info, tty->name, "rs_start"))
199 return;
200
201 local_irq_save(flags);
202 if (info->xmit.head != info->xmit.tail
203 && info->xmit.buf
204 && !(info->IER & UART_IER_THRI)) {
205 info->IER |= UART_IER_THRI;
206 custom.intena = IF_SETCLR | IF_TBE;
207 mb();
208 /* set a pending Tx Interrupt, transmitter should restart now */
209 custom.intreq = IF_SETCLR | IF_TBE;
210 mb();
211 }
212 local_irq_restore(flags);
213}
214
215/*
216 * ----------------------------------------------------------------------
217 *
218 * Here starts the interrupt handling routines. All of the following
219 * subroutines are declared as inline and are folded into
220 * rs_interrupt(). They were separated out for readability's sake.
221 *
222 * Note: rs_interrupt() is a "fast" interrupt, which means that it
223 * runs with interrupts turned off. People who may want to modify
224 * rs_interrupt() should try to keep the interrupt handler as fast as
225 * possible. After you are done making modifications, it is not a bad
226 * idea to do:
227 *
228 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
229 *
230 * and look at the resulting assemble code in serial.s.
231 *
232 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
233 * -----------------------------------------------------------------------
234 */
235
236/*
237 * This routine is used by the interrupt handler to schedule
238 * processing in the software interrupt portion of the driver.
239 */
41c28ff1
AB		 240static void rs_sched_event(struct async_struct *info,
241 int event)
1da177e4
LT		 242{
243 info->event |= 1 << event;
244 tasklet_schedule(&info->tlet);
245}
246
41c28ff1 247static void receive_chars(struct async_struct *info)
1da177e4
LT		 248{
249 int status;
250 int serdatr;
251 struct tty_struct *tty = info->tty;
33f0f88f 252 unsigned char ch, flag;
1da177e4 253 struct async_icount *icount;
33f0f88f 254 int oe = 0;
1da177e4
LT		 255
256 icount = &info->state->icount;
257
258 status = UART_LSR_DR; /* We obviously have a character! */
259 serdatr = custom.serdatr;
260 mb();
261 custom.intreq = IF_RBF;
262 mb();
263
264 if((serdatr & 0x1ff) == 0)
265 status |= UART_LSR_BI;
266 if(serdatr & SDR_OVRUN)
267 status |= UART_LSR_OE;
268
269 ch = serdatr & 0xff;
1da177e4
LT		 270 icount->rx++;
271
272#ifdef SERIAL_DEBUG_INTR
273 printk("DR%02x:%02x...", ch, status);
274#endif
33f0f88f 275 flag = TTY_NORMAL;
1da177e4
LT		 276
277 /*
278 * We don't handle parity or frame errors - but I have left
279 * the code in, since I'm not sure that the errors can't be
280 * detected.
281 */
282
283 if (status & (UART_LSR_BI | UART_LSR_PE |
284 UART_LSR_FE | UART_LSR_OE)) {
285 /*
286 * For statistics only
287 */
288 if (status & UART_LSR_BI) {
289 status &= ~(UART_LSR_FE | UART_LSR_PE);
290 icount->brk++;
291 } else if (status & UART_LSR_PE)
292 icount->parity++;
293 else if (status & UART_LSR_FE)
294 icount->frame++;
295 if (status & UART_LSR_OE)
296 icount->overrun++;
297
298 /*
299 * Now check to see if character should be
300 * ignored, and mask off conditions which
301 * should be ignored.
302 */
303 if (status & info->ignore_status_mask)
33f0f88f 304 goto out;
1da177e4
LT		 305
306 status &= info->read_status_mask;
307
308 if (status & (UART_LSR_BI)) {
309#ifdef SERIAL_DEBUG_INTR
310 printk("handling break....");
311#endif
33f0f88f 312 flag = TTY_BREAK;
1da177e4
LT		 313 if (info->flags & ASYNC_SAK)
314 do_SAK(tty);
315 } else if (status & UART_LSR_PE)
33f0f88f 316 flag = TTY_PARITY;
1da177e4 317 else if (status & UART_LSR_FE)
33f0f88f 318 flag = TTY_FRAME;
1da177e4
LT		 319 if (status & UART_LSR_OE) {
320 /*
321 * Overrun is special, since it's
322 * reported immediately, and doesn't
323 * affect the current character
324 */
33f0f88f 325 oe = 1;
1da177e4
LT		 326 }
327 }
33f0f88f
AC		 328 tty_insert_flip_char(tty, ch, flag);
329 if (oe == 1)
330 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1da177e4 331 tty_flip_buffer_push(tty);
33f0f88f
AC		 332out:
333 return;
1da177e4
LT		 334}
335
41c28ff1 336static void transmit_chars(struct async_struct *info)
1da177e4
LT		 337{
338 custom.intreq = IF_TBE;
339 mb();
340 if (info->x_char) {
341 custom.serdat = info->x_char | 0x100;
342 mb();
343 info->state->icount.tx++;
344 info->x_char = 0;
345 return;
346 }
347 if (info->xmit.head == info->xmit.tail
348 || info->tty->stopped
349 || info->tty->hw_stopped) {
350 info->IER &= ~UART_IER_THRI;
351 custom.intena = IF_TBE;
352 mb();
353 return;
354 }
355
356 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
357 mb();
358 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
359 info->state->icount.tx++;
360
361 if (CIRC_CNT(info->xmit.head,
362 info->xmit.tail,
363 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
364 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
365
366#ifdef SERIAL_DEBUG_INTR
367 printk("THRE...");
368#endif
369 if (info->xmit.head == info->xmit.tail) {
370 custom.intena = IF_TBE;
371 mb();
372 info->IER &= ~UART_IER_THRI;
373 }
374}
375
41c28ff1 376static void check_modem_status(struct async_struct *info)
1da177e4
LT		 377{
378 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
379 unsigned char dstatus;
380 struct async_icount *icount;
381
382 /* Determine bits that have changed */
383 dstatus = status ^ current_ctl_bits;
384 current_ctl_bits = status;
385
386 if (dstatus) {
387 icount = &info->state->icount;
388 /* update input line counters */
389 if (dstatus & SER_DSR)
390 icount->dsr++;
391 if (dstatus & SER_DCD) {
392 icount->dcd++;
393#ifdef CONFIG_HARD_PPS
394 if ((info->flags & ASYNC_HARDPPS_CD) &&
395 !(status & SER_DCD))
396 hardpps();
397#endif
398 }
399 if (dstatus & SER_CTS)
400 icount->cts++;
401 wake_up_interruptible(&info->delta_msr_wait);
402 }
403
404 if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
405#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
406 printk("ttyS%d CD now %s...", info->line,
407 (!(status & SER_DCD)) ? "on" : "off");
408#endif
409 if (!(status & SER_DCD))
410 wake_up_interruptible(&info->open_wait);
411 else {
412#ifdef SERIAL_DEBUG_OPEN
413 printk("doing serial hangup...");
414#endif
415 if (info->tty)
416 tty_hangup(info->tty);
417 }
418 }
419 if (info->flags & ASYNC_CTS_FLOW) {
420 if (info->tty->hw_stopped) {
421 if (!(status & SER_CTS)) {
422#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
423 printk("CTS tx start...");
424#endif
425 info->tty->hw_stopped = 0;
426 info->IER |= UART_IER_THRI;
427 custom.intena = IF_SETCLR | IF_TBE;
428 mb();
429 /* set a pending Tx Interrupt, transmitter should restart now */
430 custom.intreq = IF_SETCLR | IF_TBE;
431 mb();
432 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
433 return;
434 }
435 } else {
436 if ((status & SER_CTS)) {
437#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
438 printk("CTS tx stop...");
439#endif
440 info->tty->hw_stopped = 1;
441 info->IER &= ~UART_IER_THRI;
442 /* disable Tx interrupt and remove any pending interrupts */
443 custom.intena = IF_TBE;
444 mb();
445 custom.intreq = IF_TBE;
446 mb();
447 }
448 }
449 }
450}
451
7d12e780 452static irqreturn_t ser_vbl_int( int irq, void *data)
1da177e4
LT		 453{
454 /* vbl is just a periodic interrupt we tie into to update modem status */
455 struct async_struct * info = IRQ_ports;
456 /*
457 * TBD - is it better to unregister from this interrupt or to
458 * ignore it if MSI is clear ?
459 */
460 if(info->IER & UART_IER_MSI)
461 check_modem_status(info);
462 return IRQ_HANDLED;
463}
464
7d12e780 465static irqreturn_t ser_rx_int(int irq, void *dev_id)
1da177e4
LT		 466{
467 struct async_struct * info;
468
469#ifdef SERIAL_DEBUG_INTR
470 printk("ser_rx_int...");
471#endif
472
473 info = IRQ_ports;
474 if (!info || !info->tty)
475 return IRQ_NONE;
476
477 receive_chars(info);
478 info->last_active = jiffies;
479#ifdef SERIAL_DEBUG_INTR
480 printk("end.\n");
481#endif
482 return IRQ_HANDLED;
483}
484
7d12e780 485static irqreturn_t ser_tx_int(int irq, void *dev_id)
1da177e4
LT		 486{
487 struct async_struct * info;
488
489 if (custom.serdatr & SDR_TBE) {
490#ifdef SERIAL_DEBUG_INTR
491 printk("ser_tx_int...");
492#endif
493
494 info = IRQ_ports;
495 if (!info || !info->tty)
496 return IRQ_NONE;
497
498 transmit_chars(info);
499 info->last_active = jiffies;
500#ifdef SERIAL_DEBUG_INTR
501 printk("end.\n");
502#endif
503 }
504 return IRQ_HANDLED;
505}
506
507/*
508 * -------------------------------------------------------------------
509 * Here ends the serial interrupt routines.
510 * -------------------------------------------------------------------
511 */
512
513/*
514 * This routine is used to handle the "bottom half" processing for the
515 * serial driver, known also the "software interrupt" processing.
516 * This processing is done at the kernel interrupt level, after the
517 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
518 * is where time-consuming activities which can not be done in the
519 * interrupt driver proper are done; the interrupt driver schedules
520 * them using rs_sched_event(), and they get done here.
521 */
522
523static void do_softint(unsigned long private_)
524{
525 struct async_struct *info = (struct async_struct *) private_;
526 struct tty_struct *tty;
527
528 tty = info->tty;
529 if (!tty)
530 return;
531
b963a844 532 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
1da177e4 533 tty_wakeup(tty);
1da177e4
LT		 534}
535
536/*
537 * ---------------------------------------------------------------
538 * Low level utility subroutines for the serial driver: routines to
539 * figure out the appropriate timeout for an interrupt chain, routines
540 * to initialize and startup a serial port, and routines to shutdown a
541 * serial port. Useful stuff like that.
542 * ---------------------------------------------------------------
543 */
544
545static int startup(struct async_struct * info)
546{
547 unsigned long flags;
548 int retval=0;
549 unsigned long page;
550
551 page = get_zeroed_page(GFP_KERNEL);
552 if (!page)
553 return -ENOMEM;
554
555 local_irq_save(flags);
556
557 if (info->flags & ASYNC_INITIALIZED) {
558 free_page(page);
559 goto errout;
560 }
561
562 if (info->xmit.buf)
563 free_page(page);
564 else
565 info->xmit.buf = (unsigned char *) page;
566
567#ifdef SERIAL_DEBUG_OPEN
568 printk("starting up ttys%d ...", info->line);
569#endif
570
571 /* Clear anything in the input buffer */
572
573 custom.intreq = IF_RBF;
574 mb();
575
576 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
577 if (retval) {
578 if (serial_isroot()) {
579 if (info->tty)
580 set_bit(TTY_IO_ERROR,
581 &info->tty->flags);
582 retval = 0;
583 }
584 goto errout;
585 }
586
587 /* enable both Rx and Tx interrupts */
588 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
589 mb();
590 info->IER = UART_IER_MSI;
591
592 /* remember current state of the DCD and CTS bits */
593 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
594
595 IRQ_ports = info;
596
597 info->MCR = 0;
598 if (info->tty->termios->c_cflag & CBAUD)
599 info->MCR = SER_DTR | SER_RTS;
600 rtsdtr_ctrl(info->MCR);
601
602 if (info->tty)
603 clear_bit(TTY_IO_ERROR, &info->tty->flags);
604 info->xmit.head = info->xmit.tail = 0;
605
606 /*
607 * Set up the tty->alt_speed kludge
608 */
609 if (info->tty) {
610 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
611 info->tty->alt_speed = 57600;
612 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
613 info->tty->alt_speed = 115200;
614 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
615 info->tty->alt_speed = 230400;
616 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
617 info->tty->alt_speed = 460800;
618 }
619
620 /*
621 * and set the speed of the serial port
622 */
623 change_speed(info, NULL);
624
625 info->flags |= ASYNC_INITIALIZED;
626 local_irq_restore(flags);
627 return 0;
628
629errout:
630 local_irq_restore(flags);
631 return retval;
632}
633
634/*
635 * This routine will shutdown a serial port; interrupts are disabled, and
636 * DTR is dropped if the hangup on close termio flag is on.
637 */
638static void shutdown(struct async_struct * info)
639{
640 unsigned long flags;
641 struct serial_state *state;
642
643 if (!(info->flags & ASYNC_INITIALIZED))
644 return;
645
646 state = info->state;
647
648#ifdef SERIAL_DEBUG_OPEN
649 printk("Shutting down serial port %d ....\n", info->line);
650#endif
651
652 local_irq_save(flags); /* Disable interrupts */
653
654 /*
655 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
656 * here so the queue might never be waken up
657 */
658 wake_up_interruptible(&info->delta_msr_wait);
659
660 IRQ_ports = NULL;
661
662 /*
663 * Free the IRQ, if necessary
664 */
665 free_irq(IRQ_AMIGA_VERTB, info);
666
667 if (info->xmit.buf) {
668 free_page((unsigned long) info->xmit.buf);
669 info->xmit.buf = NULL;
670 }
671
672 info->IER = 0;
673 custom.intena = IF_RBF | IF_TBE;
674 mb();
675
676 /* disable break condition */
677 custom.adkcon = AC_UARTBRK;
678 mb();
679
680 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
681 info->MCR &= ~(SER_DTR|SER_RTS);
682 rtsdtr_ctrl(info->MCR);
683
684 if (info->tty)
685 set_bit(TTY_IO_ERROR, &info->tty->flags);
686
687 info->flags &= ~ASYNC_INITIALIZED;
688 local_irq_restore(flags);
689}
690
691
692/*
693 * This routine is called to set the UART divisor registers to match
694 * the specified baud rate for a serial port.
695 */
696static void change_speed(struct async_struct *info,
606d099c 697 struct ktermios *old_termios)
1da177e4
LT		 698{
699 int quot = 0, baud_base, baud;
700 unsigned cflag, cval = 0;
701 int bits;
702 unsigned long flags;
703
704 if (!info->tty || !info->tty->termios)
705 return;
706 cflag = info->tty->termios->c_cflag;
707
708 /* Byte size is always 8 bits plus parity bit if requested */
709
710 cval = 3; bits = 10;
711 if (cflag & CSTOPB) {
712 cval |= 0x04;
713 bits++;
714 }
715 if (cflag & PARENB) {
716 cval |= UART_LCR_PARITY;
717 bits++;
718 }
719 if (!(cflag & PARODD))
720 cval |= UART_LCR_EPAR;
721#ifdef CMSPAR
722 if (cflag & CMSPAR)
723 cval |= UART_LCR_SPAR;
724#endif
725
726 /* Determine divisor based on baud rate */
727 baud = tty_get_baud_rate(info->tty);
728 if (!baud)
729 baud = 9600; /* B0 transition handled in rs_set_termios */
730 baud_base = info->state->baud_base;
731 if (baud == 38400 &&
732 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
733 quot = info->state->custom_divisor;
734 else {
735 if (baud == 134)
736 /* Special case since 134 is really 134.5 */
737 quot = (2*baud_base / 269);
738 else if (baud)
739 quot = baud_base / baud;
740 }
741 /* If the quotient is zero refuse the change */
742 if (!quot && old_termios) {
db0ef08e 743 /* FIXME: Will need updating for new tty in the end */
1da177e4
LT		 744 info->tty->termios->c_cflag &= ~CBAUD;
745 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
746 baud = tty_get_baud_rate(info->tty);
747 if (!baud)
748 baud = 9600;
749 if (baud == 38400 &&
750 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
751 quot = info->state->custom_divisor;
752 else {
753 if (baud == 134)
754 /* Special case since 134 is really 134.5 */
755 quot = (2*baud_base / 269);
756 else if (baud)
757 quot = baud_base / baud;
758 }
759 }
760 /* As a last resort, if the quotient is zero, default to 9600 bps */
761 if (!quot)
762 quot = baud_base / 9600;
763 info->quot = quot;
764 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
765 info->timeout += HZ/50; /* Add .02 seconds of slop */
766
767 /* CTS flow control flag and modem status interrupts */
768 info->IER &= ~UART_IER_MSI;
769 if (info->flags & ASYNC_HARDPPS_CD)
770 info->IER |= UART_IER_MSI;
771 if (cflag & CRTSCTS) {
772 info->flags |= ASYNC_CTS_FLOW;
773 info->IER |= UART_IER_MSI;
774 } else
775 info->flags &= ~ASYNC_CTS_FLOW;
776 if (cflag & CLOCAL)
777 info->flags &= ~ASYNC_CHECK_CD;
778 else {
779 info->flags |= ASYNC_CHECK_CD;
780 info->IER |= UART_IER_MSI;
781 }
782 /* TBD:
4b512d26 783 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
1da177e4
LT		 784 */
785
786 /*
787 * Set up parity check flag
788 */
1da177e4
LT		 789
790 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
791 if (I_INPCK(info->tty))
792 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
793 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
794 info->read_status_mask |= UART_LSR_BI;
795
796 /*
797 * Characters to ignore
798 */
799 info->ignore_status_mask = 0;
800 if (I_IGNPAR(info->tty))
801 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
802 if (I_IGNBRK(info->tty)) {
803 info->ignore_status_mask |= UART_LSR_BI;
804 /*
805 * If we're ignore parity and break indicators, ignore
806 * overruns too. (For real raw support).
807 */
808 if (I_IGNPAR(info->tty))
809 info->ignore_status_mask |= UART_LSR_OE;
810 }
811 /*
812 * !!! ignore all characters if CREAD is not set
813 */
814 if ((cflag & CREAD) == 0)
815 info->ignore_status_mask |= UART_LSR_DR;
816 local_irq_save(flags);
817
818 {
819 short serper;
820
821 /* Set up the baud rate */
822 serper = quot - 1;
823
824 /* Enable or disable parity bit */
825
826 if(cval & UART_LCR_PARITY)
827 serper |= (SERPER_PARENB);
828
829 custom.serper = serper;
830 mb();
831 }
832
833 info->LCR = cval; /* Save LCR */
834 local_irq_restore(flags);
835}
836
257afa3c 837static int rs_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4 838{
d9ad7ef1 839 struct async_struct *info;
1da177e4
LT		 840 unsigned long flags;
841
d9ad7ef1
TJRMI		 842 info = tty->driver_data;
843
1da177e4 844 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
257afa3c 845 return 0;
1da177e4 846
d9ad7ef1 847 if (!info->xmit.buf)
257afa3c 848 return 0;
1da177e4
LT		 849
850 local_irq_save(flags);
851 if (CIRC_SPACE(info->xmit.head,
852 info->xmit.tail,
853 SERIAL_XMIT_SIZE) == 0) {
854 local_irq_restore(flags);
257afa3c 855 return 0;
1da177e4
LT		 856 }
857
858 info->xmit.buf[info->xmit.head++] = ch;
859 info->xmit.head &= SERIAL_XMIT_SIZE-1;
860 local_irq_restore(flags);
257afa3c 861 return 1;
1da177e4
LT		 862}
863
864static void rs_flush_chars(struct tty_struct *tty)
865{
c9f19e96 866 struct async_struct *info = tty->driver_data;
1da177e4
LT		 867 unsigned long flags;
868
869 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
870 return;
871
872 if (info->xmit.head == info->xmit.tail
873 || tty->stopped
874 || tty->hw_stopped
875 || !info->xmit.buf)
876 return;
877
878 local_irq_save(flags);
879 info->IER |= UART_IER_THRI;
880 custom.intena = IF_SETCLR | IF_TBE;
881 mb();
882 /* set a pending Tx Interrupt, transmitter should restart now */
883 custom.intreq = IF_SETCLR | IF_TBE;
884 mb();
885 local_irq_restore(flags);
886}
887
888static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
889{
890 int c, ret = 0;
d9ad7ef1 891 struct async_struct *info;
1da177e4
LT		 892 unsigned long flags;
893
d9ad7ef1
TJRMI		 894 info = tty->driver_data;
895
1da177e4
LT		 896 if (serial_paranoia_check(info, tty->name, "rs_write"))
897 return 0;
898
b3218a79 899 if (!info->xmit.buf)
1da177e4
LT		 900 return 0;
901
3abf3bed 902 local_irq_save(flags);
1da177e4
LT		 903 while (1) {
904 c = CIRC_SPACE_TO_END(info->xmit.head,
905 info->xmit.tail,
906 SERIAL_XMIT_SIZE);
907 if (count < c)
908 c = count;
909 if (c <= 0) {
910 break;
911 }
912 memcpy(info->xmit.buf + info->xmit.head, buf, c);
913 info->xmit.head = ((info->xmit.head + c) &
914 (SERIAL_XMIT_SIZE-1));
915 buf += c;
916 count -= c;
917 ret += c;
918 }
919 local_irq_restore(flags);
920
921 if (info->xmit.head != info->xmit.tail
922 && !tty->stopped
923 && !tty->hw_stopped
924 && !(info->IER & UART_IER_THRI)) {
925 info->IER |= UART_IER_THRI;
926 local_irq_disable();
927 custom.intena = IF_SETCLR | IF_TBE;
928 mb();
929 /* set a pending Tx Interrupt, transmitter should restart now */
930 custom.intreq = IF_SETCLR | IF_TBE;
931 mb();
932 local_irq_restore(flags);
933 }
934 return ret;
935}
936
937static int rs_write_room(struct tty_struct *tty)
938{
c9f19e96 939 struct async_struct *info = tty->driver_data;
1da177e4
LT		 940
941 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
942 return 0;
943 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
944}
945
946static int rs_chars_in_buffer(struct tty_struct *tty)
947{
c9f19e96 948 struct async_struct *info = tty->driver_data;
1da177e4
LT		 949
950 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
951 return 0;
952 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
953}
954
955static void rs_flush_buffer(struct tty_struct *tty)
956{
c9f19e96 957 struct async_struct *info = tty->driver_data;
1da177e4
LT		 958 unsigned long flags;
959
960 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
961 return;
962 local_irq_save(flags);
963 info->xmit.head = info->xmit.tail = 0;
964 local_irq_restore(flags);
1da177e4
LT		 965 tty_wakeup(tty);
966}
967
968/*
969 * This function is used to send a high-priority XON/XOFF character to
970 * the device
971 */
972static void rs_send_xchar(struct tty_struct *tty, char ch)
973{
c9f19e96 974 struct async_struct *info = tty->driver_data;
1da177e4
LT		 975 unsigned long flags;
976
977 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
978 return;
979
980 info->x_char = ch;
981 if (ch) {
982 /* Make sure transmit interrupts are on */
983
984 /* Check this ! */
985 local_irq_save(flags);
986 if(!(custom.intenar & IF_TBE)) {
987 custom.intena = IF_SETCLR | IF_TBE;
988 mb();
989 /* set a pending Tx Interrupt, transmitter should restart now */
990 custom.intreq = IF_SETCLR | IF_TBE;
991 mb();
992 }
993 local_irq_restore(flags);
994
995 info->IER |= UART_IER_THRI;
996 }
997}
998
999/*
1000 * ------------------------------------------------------------
1001 * rs_throttle()
1002 *
1003 * This routine is called by the upper-layer tty layer to signal that
1004 * incoming characters should be throttled.
1005 * ------------------------------------------------------------
1006 */
1007static void rs_throttle(struct tty_struct * tty)
1008{
c9f19e96 1009 struct async_struct *info = tty->driver_data;
1da177e4
LT		 1010 unsigned long flags;
1011#ifdef SERIAL_DEBUG_THROTTLE
1012 char buf[64];
1013
1014 printk("throttle %s: %d....\n", tty_name(tty, buf),
1015 tty->ldisc.chars_in_buffer(tty));
1016#endif
1017
1018 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1019 return;
1020
1021 if (I_IXOFF(tty))
1022 rs_send_xchar(tty, STOP_CHAR(tty));
1023
1024 if (tty->termios->c_cflag & CRTSCTS)
1025 info->MCR &= ~SER_RTS;
1026
1027 local_irq_save(flags);
1028 rtsdtr_ctrl(info->MCR);
1029 local_irq_restore(flags);
1030}
1031
1032static void rs_unthrottle(struct tty_struct * tty)
1033{
c9f19e96 1034 struct async_struct *info = tty->driver_data;
1da177e4
LT		 1035 unsigned long flags;
1036#ifdef SERIAL_DEBUG_THROTTLE
1037 char buf[64];
1038
1039 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1040 tty->ldisc.chars_in_buffer(tty));
1041#endif
1042
1043 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1044 return;
1045
1046 if (I_IXOFF(tty)) {
1047 if (info->x_char)
1048 info->x_char = 0;
1049 else
1050 rs_send_xchar(tty, START_CHAR(tty));
1051 }
1052 if (tty->termios->c_cflag & CRTSCTS)
1053 info->MCR |= SER_RTS;
1054 local_irq_save(flags);
1055 rtsdtr_ctrl(info->MCR);
1056 local_irq_restore(flags);
1057}
1058
1059/*
1060 * ------------------------------------------------------------
1061 * rs_ioctl() and friends
1062 * ------------------------------------------------------------
1063 */
1064
1065static int get_serial_info(struct async_struct * info,
ab14caec 1066 struct serial_struct __user * retinfo)
1da177e4
LT		 1067{
1068 struct serial_struct tmp;
1069 struct serial_state *state = info->state;
1070
1071 if (!retinfo)
1072 return -EFAULT;
1073 memset(&tmp, 0, sizeof(tmp));
e18ce49b 1074 lock_kernel();
1da177e4
LT		 1075 tmp.type = state->type;
1076 tmp.line = state->line;
1077 tmp.port = state->port;
1078 tmp.irq = state->irq;
1079 tmp.flags = state->flags;
1080 tmp.xmit_fifo_size = state->xmit_fifo_size;
1081 tmp.baud_base = state->baud_base;
1082 tmp.close_delay = state->close_delay;
1083 tmp.closing_wait = state->closing_wait;
1084 tmp.custom_divisor = state->custom_divisor;
e18ce49b 1085 unlock_kernel();
1da177e4
LT		 1086 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1087 return -EFAULT;
1088 return 0;
1089}
1090
1091static int set_serial_info(struct async_struct * info,
ab14caec 1092 struct serial_struct __user * new_info)
1da177e4
LT		 1093{
1094 struct serial_struct new_serial;
1095 struct serial_state old_state, *state;
1096 unsigned int change_irq,change_port;
1097 int retval = 0;
1098
1099 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1100 return -EFAULT;
e18ce49b
AC		 1101
1102 lock_kernel();
1da177e4
LT		 1103 state = info->state;
1104 old_state = *state;
1105
1106 change_irq = new_serial.irq != state->irq;
1107 change_port = (new_serial.port != state->port);
e18ce49b
AC		 1108 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1109 unlock_kernel();
1da177e4 1110 return -EINVAL;
e18ce49b 1111 }
1da177e4
LT		 1112
1113 if (!serial_isroot()) {
1114 if ((new_serial.baud_base != state->baud_base) ||
1115 (new_serial.close_delay != state->close_delay) ||
1116 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1117 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1118 (state->flags & ~ASYNC_USR_MASK)))
1119 return -EPERM;
1120 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1121 (new_serial.flags & ASYNC_USR_MASK));
1122 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1123 (new_serial.flags & ASYNC_USR_MASK));
1124 state->custom_divisor = new_serial.custom_divisor;
1125 goto check_and_exit;
1126 }
1127
e18ce49b
AC		 1128 if (new_serial.baud_base < 9600) {
1129 unlock_kernel();
1da177e4 1130 return -EINVAL;
e18ce49b 1131 }
1da177e4
LT		 1132
1133 /*
1134 * OK, past this point, all the error checking has been done.
1135 * At this point, we start making changes.....
1136 */
1137
1138 state->baud_base = new_serial.baud_base;
1139 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1140 (new_serial.flags & ASYNC_FLAGS));
1141 info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1142 (info->flags & ASYNC_INTERNAL_FLAGS));
1143 state->custom_divisor = new_serial.custom_divisor;
1144 state->close_delay = new_serial.close_delay * HZ/100;
1145 state->closing_wait = new_serial.closing_wait * HZ/100;
1146 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1147
1148check_and_exit:
1149 if (info->flags & ASYNC_INITIALIZED) {
1150 if (((old_state.flags & ASYNC_SPD_MASK) !=
1151 (state->flags & ASYNC_SPD_MASK)) ||
1152 (old_state.custom_divisor != state->custom_divisor)) {
1153 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1154 info->tty->alt_speed = 57600;
1155 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1156 info->tty->alt_speed = 115200;
1157 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1158 info->tty->alt_speed = 230400;
1159 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1160 info->tty->alt_speed = 460800;
1161 change_speed(info, NULL);
1162 }
1163 } else
1164 retval = startup(info);
e18ce49b 1165 unlock_kernel();
1da177e4
LT		 1166 return retval;
1167}
1168
1169
1170/*
1171 * get_lsr_info - get line status register info
1172 *
1173 * Purpose: Let user call ioctl() to get info when the UART physically
1174 * is emptied. On bus types like RS485, the transmitter must
1175 * release the bus after transmitting. This must be done when
1176 * the transmit shift register is empty, not be done when the
1177 * transmit holding register is empty. This functionality
1178 * allows an RS485 driver to be written in user space.
1179 */
ab14caec 1180static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1da177e4
LT		 1181{
1182 unsigned char status;
1183 unsigned int result;
1184 unsigned long flags;
1185
1186 local_irq_save(flags);
1187 status = custom.serdatr;
1188 mb();
1189 local_irq_restore(flags);
1190 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1191 if (copy_to_user(value, &result, sizeof(int)))
1192 return -EFAULT;
1193 return 0;
1194}
1195
1196
1197static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1198{
c9f19e96 1199 struct async_struct * info = tty->driver_data;
1da177e4
LT		 1200 unsigned char control, status;
1201 unsigned long flags;
1202
1203 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1204 return -ENODEV;
1205 if (tty->flags & (1 << TTY_IO_ERROR))
1206 return -EIO;
1207
1208 control = info->MCR;
1209 local_irq_save(flags);
1210 status = ciab.pra;
1211 local_irq_restore(flags);
1212 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1213 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1214 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1215 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1216 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1217}
1218
1219static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1220 unsigned int set, unsigned int clear)
1221{
c9f19e96 1222 struct async_struct * info = tty->driver_data;
1da177e4
LT		 1223 unsigned long flags;
1224
1225 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1226 return -ENODEV;
1227 if (tty->flags & (1 << TTY_IO_ERROR))
1228 return -EIO;
1229
1230 local_irq_save(flags);
1231 if (set & TIOCM_RTS)
1232 info->MCR |= SER_RTS;
1233 if (set & TIOCM_DTR)
1234 info->MCR |= SER_DTR;
1235 if (clear & TIOCM_RTS)
1236 info->MCR &= ~SER_RTS;
1237 if (clear & TIOCM_DTR)
1238 info->MCR &= ~SER_DTR;
1239 rtsdtr_ctrl(info->MCR);
1240 local_irq_restore(flags);
1241 return 0;
1242}
1243
1244/*
1245 * rs_break() --- routine which turns the break handling on or off
1246 */
9e98966c 1247static int rs_break(struct tty_struct *tty, int break_state)
1da177e4 1248{
c9f19e96 1249 struct async_struct * info = tty->driver_data;
1da177e4
LT		 1250 unsigned long flags;
1251
1252 if (serial_paranoia_check(info, tty->name, "rs_break"))
970a8a51 1253 return -EINVAL;
1da177e4
LT		 1254
1255 local_irq_save(flags);
1256 if (break_state == -1)
1257 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1258 else
1259 custom.adkcon = AC_UARTBRK;
1260 mb();
1261 local_irq_restore(flags);
9e98966c 1262 return 0;
1da177e4
LT		 1263}
1264
1265
1266static int rs_ioctl(struct tty_struct *tty, struct file * file,
1267 unsigned int cmd, unsigned long arg)
1268{
c9f19e96 1269 struct async_struct * info = tty->driver_data;
1da177e4
LT		 1270 struct async_icount cprev, cnow; /* kernel counter temps */
1271 struct serial_icounter_struct icount;
ab14caec 1272 void __user *argp = (void __user *)arg;
1da177e4
LT		 1273 unsigned long flags;
1274
1275 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1276 return -ENODEV;
1277
1278 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1279 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1280 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1281 if (tty->flags & (1 << TTY_IO_ERROR))
1282 return -EIO;
1283 }
1284
1285 switch (cmd) {
1286 case TIOCGSERIAL:
ab14caec 1287 return get_serial_info(info, argp);
1da177e4 1288 case TIOCSSERIAL:
ab14caec 1289 return set_serial_info(info, argp);
1da177e4
LT		 1290 case TIOCSERCONFIG:
1291 return 0;
1292
1293 case TIOCSERGETLSR: /* Get line status register */
ab14caec 1294 return get_lsr_info(info, argp);
1da177e4
LT		 1295
1296 case TIOCSERGSTRUCT:
ab14caec 1297 if (copy_to_user(argp,
1da177e4
LT		 1298 info, sizeof(struct async_struct)))
1299 return -EFAULT;
1300 return 0;
1301
1302 /*
1303 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1304 * - mask passed in arg for lines of interest
1305 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1306 * Caller should use TIOCGICOUNT to see which one it was
1307 */
1308 case TIOCMIWAIT:
1309 local_irq_save(flags);
1310 /* note the counters on entry */
1311 cprev = info->state->icount;
1312 local_irq_restore(flags);
1313 while (1) {
1314 interruptible_sleep_on(&info->delta_msr_wait);
1315 /* see if a signal did it */
1316 if (signal_pending(current))
1317 return -ERESTARTSYS;
1318 local_irq_save(flags);
1319 cnow = info->state->icount; /* atomic copy */
1320 local_irq_restore(flags);
1321 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1322 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1323 return -EIO; /* no change => error */
1324 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1325 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1326 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1327 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1328 return 0;
1329 }
1330 cprev = cnow;
1331 }
1332 /* NOTREACHED */
1333
1334 /*
1335 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1336 * Return: write counters to the user passed counter struct
1337 * NB: both 1->0 and 0->1 transitions are counted except for
1338 * RI where only 0->1 is counted.
1339 */
1340 case TIOCGICOUNT:
1341 local_irq_save(flags);
1342 cnow = info->state->icount;
1343 local_irq_restore(flags);
1344 icount.cts = cnow.cts;
1345 icount.dsr = cnow.dsr;
1346 icount.rng = cnow.rng;
1347 icount.dcd = cnow.dcd;
1348 icount.rx = cnow.rx;
1349 icount.tx = cnow.tx;
1350 icount.frame = cnow.frame;
1351 icount.overrun = cnow.overrun;
1352 icount.parity = cnow.parity;
1353 icount.brk = cnow.brk;
1354 icount.buf_overrun = cnow.buf_overrun;
1355
ab14caec 1356 if (copy_to_user(argp, &icount, sizeof(icount)))
1da177e4
LT		 1357 return -EFAULT;
1358 return 0;
1359 case TIOCSERGWILD:
1360 case TIOCSERSWILD:
1361 /* "setserial -W" is called in Debian boot */
1362 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1363 return 0;
1364
1365 default:
1366 return -ENOIOCTLCMD;
1367 }
1368 return 0;
1369}
1370
606d099c 1371static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1da177e4 1372{
c9f19e96 1373 struct async_struct *info = tty->driver_data;
1da177e4
LT		 1374 unsigned long flags;
1375 unsigned int cflag = tty->termios->c_cflag;
1376
1da177e4
LT		 1377 change_speed(info, old_termios);
1378
1379 /* Handle transition to B0 status */
1380 if ((old_termios->c_cflag & CBAUD) &&
1381 !(cflag & CBAUD)) {
1382 info->MCR &= ~(SER_DTR|SER_RTS);
1383 local_irq_save(flags);
1384 rtsdtr_ctrl(info->MCR);
1385 local_irq_restore(flags);
1386 }
1387
1388 /* Handle transition away from B0 status */
1389 if (!(old_termios->c_cflag & CBAUD) &&
1390 (cflag & CBAUD)) {
1391 info->MCR |= SER_DTR;
1392 if (!(tty->termios->c_cflag & CRTSCTS) ||
1393 !test_bit(TTY_THROTTLED, &tty->flags)) {
1394 info->MCR |= SER_RTS;
1395 }
1396 local_irq_save(flags);
1397 rtsdtr_ctrl(info->MCR);
1398 local_irq_restore(flags);
1399 }
1400
1401 /* Handle turning off CRTSCTS */
1402 if ((old_termios->c_cflag & CRTSCTS) &&
1403 !(tty->termios->c_cflag & CRTSCTS)) {
1404 tty->hw_stopped = 0;
1405 rs_start(tty);
1406 }
1407
1408#if 0
1409 /*
1410 * No need to wake up processes in open wait, since they
1411 * sample the CLOCAL flag once, and don't recheck it.
1412 * XXX It's not clear whether the current behavior is correct
1413 * or not. Hence, this may change.....
1414 */
1415 if (!(old_termios->c_cflag & CLOCAL) &&
1416 (tty->termios->c_cflag & CLOCAL))
1417 wake_up_interruptible(&info->open_wait);
1418#endif
1419}
1420
1421/*
1422 * ------------------------------------------------------------
1423 * rs_close()
1424 *
1425 * This routine is called when the serial port gets closed. First, we
1426 * wait for the last remaining data to be sent. Then, we unlink its
1427 * async structure from the interrupt chain if necessary, and we free
1428 * that IRQ if nothing is left in the chain.
1429 * ------------------------------------------------------------
1430 */
1431static void rs_close(struct tty_struct *tty, struct file * filp)
1432{
c9f19e96 1433 struct async_struct * info = tty->driver_data;
1da177e4
LT		 1434 struct serial_state *state;
1435 unsigned long flags;
1436
1437 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1438 return;
1439
1440 state = info->state;
1441
1442 local_irq_save(flags);
1443
1444 if (tty_hung_up_p(filp)) {
1445 DBG_CNT("before DEC-hung");
1446 local_irq_restore(flags);
1447 return;
1448 }
1449
1450#ifdef SERIAL_DEBUG_OPEN
1451 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1452#endif
1453 if ((tty->count == 1) && (state->count != 1)) {
1454 /*
1455 * Uh, oh. tty->count is 1, which means that the tty
1456 * structure will be freed. state->count should always
1457 * be one in these conditions. If it's greater than
1458 * one, we've got real problems, since it means the
1459 * serial port won't be shutdown.
1460 */
1461 printk("rs_close: bad serial port count; tty->count is 1, "
1462 "state->count is %d\n", state->count);
1463 state->count = 1;
1464 }
1465 if (--state->count < 0) {
1466 printk("rs_close: bad serial port count for ttys%d: %d\n",
1467 info->line, state->count);
1468 state->count = 0;
1469 }
1470 if (state->count) {
1471 DBG_CNT("before DEC-2");
1472 local_irq_restore(flags);
1473 return;
1474 }
1475 info->flags |= ASYNC_CLOSING;
1476 /*
1477 * Now we wait for the transmit buffer to clear; and we notify
1478 * the line discipline to only process XON/XOFF characters.
1479 */
1480 tty->closing = 1;
1481 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1482 tty_wait_until_sent(tty, info->closing_wait);
1483 /*
1484 * At this point we stop accepting input. To do this, we
1485 * disable the receive line status interrupts, and tell the
1486 * interrupt driver to stop checking the data ready bit in the
1487 * line status register.
1488 */
1489 info->read_status_mask &= ~UART_LSR_DR;
1490 if (info->flags & ASYNC_INITIALIZED) {
1491 /* disable receive interrupts */
1492 custom.intena = IF_RBF;
1493 mb();
1494 /* clear any pending receive interrupt */
1495 custom.intreq = IF_RBF;
1496 mb();
1497
1498 /*
1499 * Before we drop DTR, make sure the UART transmitter
1500 * has completely drained; this is especially
1501 * important if there is a transmit FIFO!
1502 */
1503 rs_wait_until_sent(tty, info->timeout);
1504 }
1505 shutdown(info);
978e595f 1506 rs_flush_buffer(tty);
1da177e4
LT		 1507
1508 tty_ldisc_flush(tty);
1509 tty->closing = 0;
1510 info->event = 0;
1511 info->tty = NULL;
1512 if (info->blocked_open) {
1513 if (info->close_delay) {
1514 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1515 }
1516 wake_up_interruptible(&info->open_wait);
1517 }
1518 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1519 wake_up_interruptible(&info->close_wait);
1520 local_irq_restore(flags);
1521}
1522
1523/*
1524 * rs_wait_until_sent() --- wait until the transmitter is empty
1525 */
1526static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1527{
c9f19e96 1528 struct async_struct * info = tty->driver_data;
1da177e4
LT		 1529 unsigned long orig_jiffies, char_time;
1530 int lsr;
1531
1532 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1533 return;
1534
1535 if (info->xmit_fifo_size == 0)
1536 return; /* Just in case.... */
1537
1538 orig_jiffies = jiffies;
978e595f
AC		 1539
1540 lock_kernel();
1da177e4
LT		 1541 /*
1542 * Set the check interval to be 1/5 of the estimated time to
1543 * send a single character, and make it at least 1. The check
1544 * interval should also be less than the timeout.
1545 *
1546 * Note: we have to use pretty tight timings here to satisfy
1547 * the NIST-PCTS.
1548 */
1549 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1550 char_time = char_time / 5;
1551 if (char_time == 0)
1552 char_time = 1;
1553 if (timeout)
1554 char_time = min_t(unsigned long, char_time, timeout);
1555 /*
1556 * If the transmitter hasn't cleared in twice the approximate
1557 * amount of time to send the entire FIFO, it probably won't
1558 * ever clear. This assumes the UART isn't doing flow
1559 * control, which is currently the case. Hence, if it ever
1560 * takes longer than info->timeout, this is probably due to a
1561 * UART bug of some kind. So, we clamp the timeout parameter at
1562 * 2*info->timeout.
1563 */
1564 if (!timeout || timeout > 2*info->timeout)
1565 timeout = 2*info->timeout;
1566#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1567 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1568 printk("jiff=%lu...", jiffies);
1569#endif
1570 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1571#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1572 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1573#endif
1574 msleep_interruptible(jiffies_to_msecs(char_time));
1575 if (signal_pending(current))
1576 break;
1577 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1578 break;
1579 }
cc0a8fbb 1580 __set_current_state(TASK_RUNNING);
978e595f 1581 unlock_kernel();
1da177e4
LT		 1582#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1583 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1584#endif
1585}
1586
1587/*
1588 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1589 */
1590static void rs_hangup(struct tty_struct *tty)
1591{
c9f19e96 1592 struct async_struct * info = tty->driver_data;
1da177e4
LT		 1593 struct serial_state *state = info->state;
1594
1595 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1596 return;
1597
1598 state = info->state;
1599
1600 rs_flush_buffer(tty);
1601 shutdown(info);
1602 info->event = 0;
1603 state->count = 0;
1604 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1605 info->tty = NULL;
1606 wake_up_interruptible(&info->open_wait);
1607}
1608
1609/*
1610 * ------------------------------------------------------------
1611 * rs_open() and friends
1612 * ------------------------------------------------------------
1613 */
1614static int block_til_ready(struct tty_struct *tty, struct file * filp,
1615 struct async_struct *info)
1616{
1617#ifdef DECLARE_WAITQUEUE
1618 DECLARE_WAITQUEUE(wait, current);
1619#else
1620 struct wait_queue wait = { current, NULL };
1621#endif
1622 struct serial_state *state = info->state;
1623 int retval;
1624 int do_clocal = 0, extra_count = 0;
1625 unsigned long flags;
1626
1627 /*
1628 * If the device is in the middle of being closed, then block
1629 * until it's done, and then try again.
1630 */
1631 if (tty_hung_up_p(filp) ||
1632 (info->flags & ASYNC_CLOSING)) {
1633 if (info->flags & ASYNC_CLOSING)
1634 interruptible_sleep_on(&info->close_wait);
1635#ifdef SERIAL_DO_RESTART
1636 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1637 -EAGAIN : -ERESTARTSYS);
1638#else
1639 return -EAGAIN;
1640#endif
1641 }
1642
1643 /*
1644 * If non-blocking mode is set, or the port is not enabled,
1645 * then make the check up front and then exit.
1646 */
1647 if ((filp->f_flags & O_NONBLOCK) ||
1648 (tty->flags & (1 << TTY_IO_ERROR))) {
1649 info->flags |= ASYNC_NORMAL_ACTIVE;
1650 return 0;
1651 }
1652
1653 if (tty->termios->c_cflag & CLOCAL)
1654 do_clocal = 1;
1655
1656 /*
1657 * Block waiting for the carrier detect and the line to become
1658 * free (i.e., not in use by the callout). While we are in
1659 * this loop, state->count is dropped by one, so that
1660 * rs_close() knows when to free things. We restore it upon
1661 * exit, either normal or abnormal.
1662 */
1663 retval = 0;
1664 add_wait_queue(&info->open_wait, &wait);
1665#ifdef SERIAL_DEBUG_OPEN
1666 printk("block_til_ready before block: ttys%d, count = %d\n",
1667 state->line, state->count);
1668#endif
1669 local_irq_save(flags);
1670 if (!tty_hung_up_p(filp)) {
1671 extra_count = 1;
1672 state->count--;
1673 }
1674 local_irq_restore(flags);
1675 info->blocked_open++;
1676 while (1) {
1677 local_irq_save(flags);
1678 if (tty->termios->c_cflag & CBAUD)
1679 rtsdtr_ctrl(SER_DTR|SER_RTS);
1680 local_irq_restore(flags);
1681 set_current_state(TASK_INTERRUPTIBLE);
1682 if (tty_hung_up_p(filp) ||
1683 !(info->flags & ASYNC_INITIALIZED)) {
1684#ifdef SERIAL_DO_RESTART
1685 if (info->flags & ASYNC_HUP_NOTIFY)
1686 retval = -EAGAIN;
1687 else
1688 retval = -ERESTARTSYS;
1689#else
1690 retval = -EAGAIN;
1691#endif
1692 break;
1693 }
1694 if (!(info->flags & ASYNC_CLOSING) &&
1695 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1696 break;
1697 if (signal_pending(current)) {
1698 retval = -ERESTARTSYS;
1699 break;
1700 }
1701#ifdef SERIAL_DEBUG_OPEN
1702 printk("block_til_ready blocking: ttys%d, count = %d\n",
1703 info->line, state->count);
1704#endif
1705 schedule();
1706 }
cc0a8fbb 1707 __set_current_state(TASK_RUNNING);
1da177e4
LT		 1708 remove_wait_queue(&info->open_wait, &wait);
1709 if (extra_count)
1710 state->count++;
1711 info->blocked_open--;
1712#ifdef SERIAL_DEBUG_OPEN
1713 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1714 info->line, state->count);
1715#endif
1716 if (retval)
1717 return retval;
1718 info->flags |= ASYNC_NORMAL_ACTIVE;
1719 return 0;
1720}
1721
1722static int get_async_struct(int line, struct async_struct **ret_info)
1723{
1724 struct async_struct *info;
1725 struct serial_state *sstate;
1726
1727 sstate = rs_table + line;
1728 sstate->count++;
1729 if (sstate->info) {
1730 *ret_info = sstate->info;
1731 return 0;
1732 }
dd00cc48 1733 info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1da177e4
LT		 1734 if (!info) {
1735 sstate->count--;
1736 return -ENOMEM;
1737 }
1da177e4
LT		 1738#ifdef DECLARE_WAITQUEUE
1739 init_waitqueue_head(&info->open_wait);
1740 init_waitqueue_head(&info->close_wait);
1741 init_waitqueue_head(&info->delta_msr_wait);
1742#endif
1743 info->magic = SERIAL_MAGIC;
1744 info->port = sstate->port;
1745 info->flags = sstate->flags;
1746 info->xmit_fifo_size = sstate->xmit_fifo_size;
1747 info->line = line;
1748 tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1749 info->state = sstate;
1750 if (sstate->info) {
1751 kfree(info);
1752 *ret_info = sstate->info;
1753 return 0;
1754 }
1755 *ret_info = sstate->info = info;
1756 return 0;
1757}
1758
1759/*
1760 * This routine is called whenever a serial port is opened. It
1761 * enables interrupts for a serial port, linking in its async structure into
1762 * the IRQ chain. It also performs the serial-specific
1763 * initialization for the tty structure.
1764 */
1765static int rs_open(struct tty_struct *tty, struct file * filp)
1766{
1767 struct async_struct *info;
1768 int retval, line;
1da177e4
LT		 1769
1770 line = tty->index;
1771 if ((line < 0) || (line >= NR_PORTS)) {
1772 return -ENODEV;
1773 }
1774 retval = get_async_struct(line, &info);
1775 if (retval) {
1776 return retval;
1777 }
1778 tty->driver_data = info;
1779 info->tty = tty;
1780 if (serial_paranoia_check(info, tty->name, "rs_open"))
1781 return -ENODEV;
1782
1783#ifdef SERIAL_DEBUG_OPEN
1784 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1785#endif
1786 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1787
1da177e4
LT		 1788 /*
1789 * If the port is the middle of closing, bail out now
1790 */
1791 if (tty_hung_up_p(filp) ||
1792 (info->flags & ASYNC_CLOSING)) {
1793 if (info->flags & ASYNC_CLOSING)
1794 interruptible_sleep_on(&info->close_wait);
1795#ifdef SERIAL_DO_RESTART
1796 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1797 -EAGAIN : -ERESTARTSYS);
1798#else
1799 return -EAGAIN;
1800#endif
1801 }
1802
1803 /*
1804 * Start up serial port
1805 */
1806 retval = startup(info);
1807 if (retval) {
1808 return retval;
1809 }
1810
1811 retval = block_til_ready(tty, filp, info);
1812 if (retval) {
1813#ifdef SERIAL_DEBUG_OPEN
1814 printk("rs_open returning after block_til_ready with %d\n",
1815 retval);
1816#endif
1817 return retval;
1818 }
1819
1820#ifdef SERIAL_DEBUG_OPEN
1821 printk("rs_open %s successful...", tty->name);
1822#endif
1823 return 0;
1824}
1825
1826/*
1827 * /proc fs routines....
1828 */
1829
d594027d 1830static inline void line_info(struct seq_file *m, struct serial_state *state)
1da177e4
LT		 1831{
1832 struct async_struct *info = state->info, scr_info;
1833 char stat_buf[30], control, status;
1da177e4
LT		 1834 unsigned long flags;
1835
d594027d 1836 seq_printf(m, "%d: uart:amiga_builtin",state->line);
1da177e4
LT		 1837
1838 /*
1839 * Figure out the current RS-232 lines
1840 */
1841 if (!info) {
1842 info = &scr_info; /* This is just for serial_{in,out} */
1843
1844 info->magic = SERIAL_MAGIC;
1845 info->flags = state->flags;
1846 info->quot = 0;
1847 info->tty = NULL;
1848 }
1849 local_irq_save(flags);
1850 status = ciab.pra;
1851 control = info ? info->MCR : status;
1852 local_irq_restore(flags);
1853
1854 stat_buf[0] = 0;
1855 stat_buf[1] = 0;
1856 if(!(control & SER_RTS))
1857 strcat(stat_buf, "|RTS");
1858 if(!(status & SER_CTS))
1859 strcat(stat_buf, "|CTS");
1860 if(!(control & SER_DTR))
1861 strcat(stat_buf, "|DTR");
1862 if(!(status & SER_DSR))
1863 strcat(stat_buf, "|DSR");
1864 if(!(status & SER_DCD))
1865 strcat(stat_buf, "|CD");
1866
1867 if (info->quot) {
d594027d 1868 seq_printf(m, " baud:%d", state->baud_base / info->quot);
1da177e4
LT		 1869 }
1870
d594027d 1871 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1da177e4
LT		 1872
1873 if (state->icount.frame)
d594027d 1874 seq_printf(m, " fe:%d", state->icount.frame);
1da177e4
LT		 1875
1876 if (state->icount.parity)
d594027d 1877 seq_printf(m, " pe:%d", state->icount.parity);
1da177e4
LT		 1878
1879 if (state->icount.brk)
d594027d 1880 seq_printf(m, " brk:%d", state->icount.brk);
1da177e4
LT		 1881
1882 if (state->icount.overrun)
d594027d 1883 seq_printf(m, " oe:%d", state->icount.overrun);
1da177e4
LT		 1884
1885 /*
1886 * Last thing is the RS-232 status lines
1887 */
d594027d 1888 seq_printf(m, " %s\n", stat_buf+1);
1da177e4
LT		 1889}
1890
d594027d 1891static int rs_proc_show(struct seq_file *m, void *v)
1da177e4 1892{
d594027d
AD		 1893 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1894 line_info(m, &rs_table[0]);
1895 return 0;
1da177e4
LT		 1896}
1897
d594027d
AD		 1898static int rs_proc_open(struct inode *inode, struct file *file)
1899{
1900 return single_open(file, rs_proc_show, NULL);
1901}
1902
1903static const struct file_operations rs_proc_fops = {
1904 .owner = THIS_MODULE,
1905 .open = rs_proc_open,
1906 .read = seq_read,
1907 .llseek = seq_lseek,
1908 .release = single_release,
1909};
1910
1da177e4
LT		 1911/*
1912 * ---------------------------------------------------------------------
1913 * rs_init() and friends
1914 *
1915 * rs_init() is called at boot-time to initialize the serial driver.
1916 * ---------------------------------------------------------------------
1917 */
1918
1919/*
1920 * This routine prints out the appropriate serial driver version
1921 * number, and identifies which options were configured into this
1922 * driver.
1923 */
41c28ff1 1924static void show_serial_version(void)
1da177e4
LT		 1925{
1926 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1927}
1928
1929
b68e31d0 1930static const struct tty_operations serial_ops = {
1da177e4
LT		 1931 .open = rs_open,
1932 .close = rs_close,
1933 .write = rs_write,
1934 .put_char = rs_put_char,
1935 .flush_chars = rs_flush_chars,
1936 .write_room = rs_write_room,
1937 .chars_in_buffer = rs_chars_in_buffer,
1938 .flush_buffer = rs_flush_buffer,
1939 .ioctl = rs_ioctl,
1940 .throttle = rs_throttle,
1941 .unthrottle = rs_unthrottle,
1942 .set_termios = rs_set_termios,
1943 .stop = rs_stop,
1944 .start = rs_start,
1945 .hangup = rs_hangup,
1946 .break_ctl = rs_break,
1947 .send_xchar = rs_send_xchar,
1948 .wait_until_sent = rs_wait_until_sent,
1da177e4
LT		 1949 .tiocmget = rs_tiocmget,
1950 .tiocmset = rs_tiocmset,
d594027d 1951 .proc_fops = &rs_proc_fops,
1da177e4
LT		 1952};
1953
1954/*
1955 * The serial driver boot-time initialization code!
1956 */
1957static int __init rs_init(void)
1958{
1959 unsigned long flags;
1960 struct serial_state * state;
5edc304f 1961 int error;
1da177e4
LT		 1962
1963 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1964 return -ENODEV;
1965
1966 serial_driver = alloc_tty_driver(1);
1967 if (!serial_driver)
1968 return -ENOMEM;
1969
1970 /*
1971 * We request SERDAT and SERPER only, because the serial registers are
1972 * too spreaded over the custom register space
1973 */
5edc304f
GU		 1974 if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4,
1975 "amiserial [Paula]")) {
1976 error = -EBUSY;
1977 goto fail_put_tty_driver;
1978 }
1da177e4
LT		 1979
1980 IRQ_ports = NULL;
1981
1982 show_serial_version();
1983
1984 /* Initialize the tty_driver structure */
1985
1986 serial_driver->owner = THIS_MODULE;
1987 serial_driver->driver_name = "amiserial";
1988 serial_driver->name = "ttyS";
1989 serial_driver->major = TTY_MAJOR;
1990 serial_driver->minor_start = 64;
1991 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1992 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1993 serial_driver->init_termios = tty_std_termios;
1994 serial_driver->init_termios.c_cflag =
1995 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1996 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1997 tty_set_operations(serial_driver, &serial_ops);
1998
5edc304f
GU		 1999 error = tty_register_driver(serial_driver);
2000 if (error)
2001 goto fail_release_mem_region;
1da177e4
LT		 2002
2003 state = rs_table;
2004 state->magic = SSTATE_MAGIC;
2005 state->port = (int)&custom.serdatr; /* Just to give it a value */
2006 state->line = 0;
2007 state->custom_divisor = 0;
2008 state->close_delay = 5*HZ/10;
2009 state->closing_wait = 30*HZ;
2010 state->icount.cts = state->icount.dsr =
2011 state->icount.rng = state->icount.dcd = 0;
2012 state->icount.rx = state->icount.tx = 0;
2013 state->icount.frame = state->icount.parity = 0;
2014 state->icount.overrun = state->icount.brk = 0;
1da177e4
LT		 2015
2016 printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2017 state->line);
2018
2019 /* Hardware set up */
2020
2021 state->baud_base = amiga_colorclock;
2022 state->xmit_fifo_size = 1;
2023
2024 local_irq_save(flags);
2025
2026 /* set ISRs, and then disable the rx interrupts */
5edc304f
GU		 2027 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2028 if (error)
2029 goto fail_unregister;
2030
2031 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED,
2032 "serial RX", state);
2033 if (error)
2034 goto fail_free_irq;
1da177e4
LT		 2035
2036 /* turn off Rx and Tx interrupts */
2037 custom.intena = IF_RBF | IF_TBE;
2038 mb();
2039
2040 /* clear any pending interrupt */
2041 custom.intreq = IF_RBF | IF_TBE;
2042 mb();
2043
2044 local_irq_restore(flags);
2045
2046 /*
2047 * set the appropriate directions for the modem control flags,
2048 * and clear RTS and DTR
2049 */
2050 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2051 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2052
2053 return 0;
5edc304f
GU		 2054
2055fail_free_irq:
2056 free_irq(IRQ_AMIGA_TBE, state);
2057fail_unregister:
2058 tty_unregister_driver(serial_driver);
2059fail_release_mem_region:
2060 release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2061fail_put_tty_driver:
2062 put_tty_driver(serial_driver);
2063 return error;
1da177e4
LT		 2064}
2065
2066static __exit void rs_exit(void)
2067{
2068 int error;
2069 struct async_struct *info = rs_table[0].info;
2070
2071 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2072 tasklet_kill(&info->tlet);
2073 if ((error = tty_unregister_driver(serial_driver)))
2074 printk("SERIAL: failed to unregister serial driver (%d)\n",
2075 error);
2076 put_tty_driver(serial_driver);
2077
2078 if (info) {
2079 rs_table[0].info = NULL;
2080 kfree(info);
2081 }
2082
5edc304f
GU		 2083 free_irq(IRQ_AMIGA_TBE, rs_table);
2084 free_irq(IRQ_AMIGA_RBF, rs_table);
2085
1da177e4
LT		 2086 release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2087}
2088
2089module_init(rs_init)
2090module_exit(rs_exit)
2091
2092
d1a35e4d
GU		 2093#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2094
1da177e4
LT		 2095/*
2096 * ------------------------------------------------------------
2097 * Serial console driver
2098 * ------------------------------------------------------------
2099 */
1da177e4
LT		 2100
2101static void amiga_serial_putc(char c)
2102{
2103 custom.serdat = (unsigned char)c | 0x100;
2104 while (!(custom.serdatr & 0x2000))
2105 barrier();
2106}
2107
2108/*
2109 * Print a string to the serial port trying not to disturb
2110 * any possible real use of the port...
2111 *
2112 * The console must be locked when we get here.
2113 */
2114static void serial_console_write(struct console *co, const char *s,
2115 unsigned count)
2116{
2117 unsigned short intena = custom.intenar;
2118
2119 custom.intena = IF_TBE;
2120
2121 while (count--) {
2122 if (*s == '\n')
2123 amiga_serial_putc('\r');
2124 amiga_serial_putc(*s++);
2125 }
2126
2127 custom.intena = IF_SETCLR | (intena & IF_TBE);
2128}
2129
2130static struct tty_driver *serial_console_device(struct console *c, int *index)
2131{
2132 *index = 0;
2133 return serial_driver;
2134}
2135
2136static struct console sercons = {
2137 .name = "ttyS",
2138 .write = serial_console_write,
2139 .device = serial_console_device,
2140 .flags = CON_PRINTBUFFER,
2141 .index = -1,
2142};
2143
2144/*
2145 * Register console.
2146 */
2147static int __init amiserial_console_init(void)
2148{
2149 register_console(&sercons);
2150 return 0;
2151}
2152console_initcall(amiserial_console_init);
d1a35e4d
GU		 2153
2154#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1da177e4
LT		 2155
2156MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)