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authorGreg Kroah-Hartman <gregkh@suse.de>2011-02-22 19:14:56 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-02-22 19:14:56 -0500
commita6afd9f3e819de4795fcd356e5bfad446e4323f2 (patch)
tree3402b3981867fd4057b4eb33583b6300ae93b9a6 /drivers/tty/amiserial.c
parent44ed76b78e158d852f640d533b7acc08b91f2132 (diff)
tty: move a number of tty drivers from drivers/char/ to drivers/tty/
As planned by Arnd Bergmann, this moves the following drivers from drivers/char/ to drivers/tty/ as that's where they really belong: amiserial nozomi synclink rocket cyclades moxa mxser isicom bfin_jtag_comm Cc: Arnd Bergmann <arnd@arndb.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty/amiserial.c')
-rw-r--r--drivers/tty/amiserial.c2178
1 files changed, 2178 insertions, 0 deletions
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
new file mode 100644
index 000000000000..f214e5022472
--- /dev/null
+++ b/drivers/tty/amiserial.c
@@ -0,0 +1,2178 @@
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
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
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>
82#include <linux/seq_file.h>
83#include <linux/slab.h>
84#include <linux/init.h>
85#include <linux/bitops.h>
86#include <linux/platform_device.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
97#define custom amiga_custom
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
109static void change_speed(struct async_struct *info, struct ktermios *old);
110static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
111
112
113static struct serial_state rs_table[1];
114
115#define NR_PORTS ARRAY_SIZE(rs_table)
116
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{
175 struct async_struct *info = tty->driver_data;
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{
195 struct async_struct *info = tty->driver_data;
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 */
240static void rs_sched_event(struct async_struct *info,
241 int event)
242{
243 info->event |= 1 << event;
244 tasklet_schedule(&info->tlet);
245}
246
247static void receive_chars(struct async_struct *info)
248{
249 int status;
250 int serdatr;
251 struct tty_struct *tty = info->tty;
252 unsigned char ch, flag;
253 struct async_icount *icount;
254 int oe = 0;
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;
270 icount->rx++;
271
272#ifdef SERIAL_DEBUG_INTR
273 printk("DR%02x:%02x...", ch, status);
274#endif
275 flag = TTY_NORMAL;
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)
304 goto out;
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
312 flag = TTY_BREAK;
313 if (info->flags & ASYNC_SAK)
314 do_SAK(tty);
315 } else if (status & UART_LSR_PE)
316 flag = TTY_PARITY;
317 else if (status & UART_LSR_FE)
318 flag = TTY_FRAME;
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 */
325 oe = 1;
326 }
327 }
328 tty_insert_flip_char(tty, ch, flag);
329 if (oe == 1)
330 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
331 tty_flip_buffer_push(tty);
332out:
333 return;
334}
335
336static void transmit_chars(struct async_struct *info)
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
376static void check_modem_status(struct async_struct *info)
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
452static irqreturn_t ser_vbl_int( int irq, void *data)
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
465static irqreturn_t ser_rx_int(int irq, void *dev_id)
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
485static irqreturn_t ser_tx_int(int irq, void *dev_id)
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
532 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
533 tty_wakeup(tty);
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,
697 struct ktermios *old_termios)
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) {
743 /* FIXME: Will need updating for new tty in the end */
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:
783 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
784 */
785
786 /*
787 * Set up parity check flag
788 */
789
790 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
791 if (I_INPCK(info->tty))
792 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
793 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
794 info->read_status_mask |= UART_LSR_BI;
795
796 /*
797 * Characters to ignore
798 */
799 info->ignore_status_mask = 0;
800 if (I_IGNPAR(info->tty))
801 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
802 if (I_IGNBRK(info->tty)) {
803 info->ignore_status_mask |= UART_LSR_BI;
804 /*
805 * If we're ignore parity and break indicators, ignore
806 * overruns too. (For real raw support).
807 */
808 if (I_IGNPAR(info->tty))
809 info->ignore_status_mask |= UART_LSR_OE;
810 }
811 /*
812 * !!! ignore all characters if CREAD is not set
813 */
814 if ((cflag & CREAD) == 0)
815 info->ignore_status_mask |= UART_LSR_DR;
816 local_irq_save(flags);
817
818 {
819 short serper;
820
821 /* Set up the baud rate */
822 serper = quot - 1;
823
824 /* Enable or disable parity bit */
825
826 if(cval & UART_LCR_PARITY)
827 serper |= (SERPER_PARENB);
828
829 custom.serper = serper;
830 mb();
831 }
832
833 info->LCR = cval; /* Save LCR */
834 local_irq_restore(flags);
835}
836
837static int rs_put_char(struct tty_struct *tty, unsigned char ch)
838{
839 struct async_struct *info;
840 unsigned long flags;
841
842 info = tty->driver_data;
843
844 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
845 return 0;
846
847 if (!info->xmit.buf)
848 return 0;
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);
855 return 0;
856 }
857
858 info->xmit.buf[info->xmit.head++] = ch;
859 info->xmit.head &= SERIAL_XMIT_SIZE-1;
860 local_irq_restore(flags);
861 return 1;
862}
863
864static void rs_flush_chars(struct tty_struct *tty)
865{
866 struct async_struct *info = tty->driver_data;
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;
891 struct async_struct *info;
892 unsigned long flags;
893
894 info = tty->driver_data;
895
896 if (serial_paranoia_check(info, tty->name, "rs_write"))
897 return 0;
898
899 if (!info->xmit.buf)
900 return 0;
901
902 local_irq_save(flags);
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{
939 struct async_struct *info = tty->driver_data;
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{
948 struct async_struct *info = tty->driver_data;
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{
957 struct async_struct *info = tty->driver_data;
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);
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{
974 struct async_struct *info = tty->driver_data;
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{
1009 struct async_struct *info = tty->driver_data;
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{
1034 struct async_struct *info = tty->driver_data;
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,
1066 struct serial_struct __user * retinfo)
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));
1074 tty_lock();
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;
1085 tty_unlock();
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,
1092 struct serial_struct __user * new_info)
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;
1101
1102 tty_lock();
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);
1108 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1109 tty_unlock();
1110 return -EINVAL;
1111 }
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
1128 if (new_serial.baud_base < 9600) {
1129 tty_unlock();
1130 return -EINVAL;
1131 }
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);
1165 tty_unlock();
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 */
1180static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
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)
1198{
1199 struct async_struct * info = tty->driver_data;
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, unsigned int set,
1220 unsigned int clear)
1221{
1222 struct async_struct * info = tty->driver_data;
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 */
1247static int rs_break(struct tty_struct *tty, int break_state)
1248{
1249 struct async_struct * info = tty->driver_data;
1250 unsigned long flags;
1251
1252 if (serial_paranoia_check(info, tty->name, "rs_break"))
1253 return -EINVAL;
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);
1262 return 0;
1263}
1264
1265/*
1266 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1267 * Return: write counters to the user passed counter struct
1268 * NB: both 1->0 and 0->1 transitions are counted except for
1269 * RI where only 0->1 is counted.
1270 */
1271static int rs_get_icount(struct tty_struct *tty,
1272 struct serial_icounter_struct *icount)
1273{
1274 struct async_struct *info = tty->driver_data;
1275 struct async_icount cnow;
1276 unsigned long flags;
1277
1278 local_irq_save(flags);
1279 cnow = info->state->icount;
1280 local_irq_restore(flags);
1281 icount->cts = cnow.cts;
1282 icount->dsr = cnow.dsr;
1283 icount->rng = cnow.rng;
1284 icount->dcd = cnow.dcd;
1285 icount->rx = cnow.rx;
1286 icount->tx = cnow.tx;
1287 icount->frame = cnow.frame;
1288 icount->overrun = cnow.overrun;
1289 icount->parity = cnow.parity;
1290 icount->brk = cnow.brk;
1291 icount->buf_overrun = cnow.buf_overrun;
1292
1293 return 0;
1294}
1295
1296static int rs_ioctl(struct tty_struct *tty,
1297 unsigned int cmd, unsigned long arg)
1298{
1299 struct async_struct * info = tty->driver_data;
1300 struct async_icount cprev, cnow; /* kernel counter temps */
1301 void __user *argp = (void __user *)arg;
1302 unsigned long flags;
1303
1304 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1305 return -ENODEV;
1306
1307 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1308 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1309 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1310 if (tty->flags & (1 << TTY_IO_ERROR))
1311 return -EIO;
1312 }
1313
1314 switch (cmd) {
1315 case TIOCGSERIAL:
1316 return get_serial_info(info, argp);
1317 case TIOCSSERIAL:
1318 return set_serial_info(info, argp);
1319 case TIOCSERCONFIG:
1320 return 0;
1321
1322 case TIOCSERGETLSR: /* Get line status register */
1323 return get_lsr_info(info, argp);
1324
1325 case TIOCSERGSTRUCT:
1326 if (copy_to_user(argp,
1327 info, sizeof(struct async_struct)))
1328 return -EFAULT;
1329 return 0;
1330
1331 /*
1332 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1333 * - mask passed in arg for lines of interest
1334 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1335 * Caller should use TIOCGICOUNT to see which one it was
1336 */
1337 case TIOCMIWAIT:
1338 local_irq_save(flags);
1339 /* note the counters on entry */
1340 cprev = info->state->icount;
1341 local_irq_restore(flags);
1342 while (1) {
1343 interruptible_sleep_on(&info->delta_msr_wait);
1344 /* see if a signal did it */
1345 if (signal_pending(current))
1346 return -ERESTARTSYS;
1347 local_irq_save(flags);
1348 cnow = info->state->icount; /* atomic copy */
1349 local_irq_restore(flags);
1350 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1351 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1352 return -EIO; /* no change => error */
1353 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1354 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1355 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1356 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1357 return 0;
1358 }
1359 cprev = cnow;
1360 }
1361 /* NOTREACHED */
1362
1363 case TIOCSERGWILD:
1364 case TIOCSERSWILD:
1365 /* "setserial -W" is called in Debian boot */
1366 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1367 return 0;
1368
1369 default:
1370 return -ENOIOCTLCMD;
1371 }
1372 return 0;
1373}
1374
1375static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1376{
1377 struct async_struct *info = tty->driver_data;
1378 unsigned long flags;
1379 unsigned int cflag = tty->termios->c_cflag;
1380
1381 change_speed(info, old_termios);
1382
1383 /* Handle transition to B0 status */
1384 if ((old_termios->c_cflag & CBAUD) &&
1385 !(cflag & CBAUD)) {
1386 info->MCR &= ~(SER_DTR|SER_RTS);
1387 local_irq_save(flags);
1388 rtsdtr_ctrl(info->MCR);
1389 local_irq_restore(flags);
1390 }
1391
1392 /* Handle transition away from B0 status */
1393 if (!(old_termios->c_cflag & CBAUD) &&
1394 (cflag & CBAUD)) {
1395 info->MCR |= SER_DTR;
1396 if (!(tty->termios->c_cflag & CRTSCTS) ||
1397 !test_bit(TTY_THROTTLED, &tty->flags)) {
1398 info->MCR |= SER_RTS;
1399 }
1400 local_irq_save(flags);
1401 rtsdtr_ctrl(info->MCR);
1402 local_irq_restore(flags);
1403 }
1404
1405 /* Handle turning off CRTSCTS */
1406 if ((old_termios->c_cflag & CRTSCTS) &&
1407 !(tty->termios->c_cflag & CRTSCTS)) {
1408 tty->hw_stopped = 0;
1409 rs_start(tty);
1410 }
1411
1412#if 0
1413 /*
1414 * No need to wake up processes in open wait, since they
1415 * sample the CLOCAL flag once, and don't recheck it.
1416 * XXX It's not clear whether the current behavior is correct
1417 * or not. Hence, this may change.....
1418 */
1419 if (!(old_termios->c_cflag & CLOCAL) &&
1420 (tty->termios->c_cflag & CLOCAL))
1421 wake_up_interruptible(&info->open_wait);
1422#endif
1423}
1424
1425/*
1426 * ------------------------------------------------------------
1427 * rs_close()
1428 *
1429 * This routine is called when the serial port gets closed. First, we
1430 * wait for the last remaining data to be sent. Then, we unlink its
1431 * async structure from the interrupt chain if necessary, and we free
1432 * that IRQ if nothing is left in the chain.
1433 * ------------------------------------------------------------
1434 */
1435static void rs_close(struct tty_struct *tty, struct file * filp)
1436{
1437 struct async_struct * info = tty->driver_data;
1438 struct serial_state *state;
1439 unsigned long flags;
1440
1441 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1442 return;
1443
1444 state = info->state;
1445
1446 local_irq_save(flags);
1447
1448 if (tty_hung_up_p(filp)) {
1449 DBG_CNT("before DEC-hung");
1450 local_irq_restore(flags);
1451 return;
1452 }
1453
1454#ifdef SERIAL_DEBUG_OPEN
1455 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1456#endif
1457 if ((tty->count == 1) && (state->count != 1)) {
1458 /*
1459 * Uh, oh. tty->count is 1, which means that the tty
1460 * structure will be freed. state->count should always
1461 * be one in these conditions. If it's greater than
1462 * one, we've got real problems, since it means the
1463 * serial port won't be shutdown.
1464 */
1465 printk("rs_close: bad serial port count; tty->count is 1, "
1466 "state->count is %d\n", state->count);
1467 state->count = 1;
1468 }
1469 if (--state->count < 0) {
1470 printk("rs_close: bad serial port count for ttys%d: %d\n",
1471 info->line, state->count);
1472 state->count = 0;
1473 }
1474 if (state->count) {
1475 DBG_CNT("before DEC-2");
1476 local_irq_restore(flags);
1477 return;
1478 }
1479 info->flags |= ASYNC_CLOSING;
1480 /*
1481 * Now we wait for the transmit buffer to clear; and we notify
1482 * the line discipline to only process XON/XOFF characters.
1483 */
1484 tty->closing = 1;
1485 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1486 tty_wait_until_sent(tty, info->closing_wait);
1487 /*
1488 * At this point we stop accepting input. To do this, we
1489 * disable the receive line status interrupts, and tell the
1490 * interrupt driver to stop checking the data ready bit in the
1491 * line status register.
1492 */
1493 info->read_status_mask &= ~UART_LSR_DR;
1494 if (info->flags & ASYNC_INITIALIZED) {
1495 /* disable receive interrupts */
1496 custom.intena = IF_RBF;
1497 mb();
1498 /* clear any pending receive interrupt */
1499 custom.intreq = IF_RBF;
1500 mb();
1501
1502 /*
1503 * Before we drop DTR, make sure the UART transmitter
1504 * has completely drained; this is especially
1505 * important if there is a transmit FIFO!
1506 */
1507 rs_wait_until_sent(tty, info->timeout);
1508 }
1509 shutdown(info);
1510 rs_flush_buffer(tty);
1511
1512 tty_ldisc_flush(tty);
1513 tty->closing = 0;
1514 info->event = 0;
1515 info->tty = NULL;
1516 if (info->blocked_open) {
1517 if (info->close_delay) {
1518 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1519 }
1520 wake_up_interruptible(&info->open_wait);
1521 }
1522 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1523 wake_up_interruptible(&info->close_wait);
1524 local_irq_restore(flags);
1525}
1526
1527/*
1528 * rs_wait_until_sent() --- wait until the transmitter is empty
1529 */
1530static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1531{
1532 struct async_struct * info = tty->driver_data;
1533 unsigned long orig_jiffies, char_time;
1534 int tty_was_locked = tty_locked();
1535 int lsr;
1536
1537 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1538 return;
1539
1540 if (info->xmit_fifo_size == 0)
1541 return; /* Just in case.... */
1542
1543 orig_jiffies = jiffies;
1544
1545 /*
1546 * tty_wait_until_sent is called from lots of places,
1547 * with or without the BTM.
1548 */
1549 if (!tty_was_locked)
1550 tty_lock();
1551 /*
1552 * Set the check interval to be 1/5 of the estimated time to
1553 * send a single character, and make it at least 1. The check
1554 * interval should also be less than the timeout.
1555 *
1556 * Note: we have to use pretty tight timings here to satisfy
1557 * the NIST-PCTS.
1558 */
1559 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1560 char_time = char_time / 5;
1561 if (char_time == 0)
1562 char_time = 1;
1563 if (timeout)
1564 char_time = min_t(unsigned long, char_time, timeout);
1565 /*
1566 * If the transmitter hasn't cleared in twice the approximate
1567 * amount of time to send the entire FIFO, it probably won't
1568 * ever clear. This assumes the UART isn't doing flow
1569 * control, which is currently the case. Hence, if it ever
1570 * takes longer than info->timeout, this is probably due to a
1571 * UART bug of some kind. So, we clamp the timeout parameter at
1572 * 2*info->timeout.
1573 */
1574 if (!timeout || timeout > 2*info->timeout)
1575 timeout = 2*info->timeout;
1576#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1577 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1578 printk("jiff=%lu...", jiffies);
1579#endif
1580 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1581#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1582 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1583#endif
1584 msleep_interruptible(jiffies_to_msecs(char_time));
1585 if (signal_pending(current))
1586 break;
1587 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1588 break;
1589 }
1590 __set_current_state(TASK_RUNNING);
1591 if (!tty_was_locked)
1592 tty_unlock();
1593#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1594 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1595#endif
1596}
1597
1598/*
1599 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1600 */
1601static void rs_hangup(struct tty_struct *tty)
1602{
1603 struct async_struct * info = tty->driver_data;
1604 struct serial_state *state = info->state;
1605
1606 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1607 return;
1608
1609 state = info->state;
1610
1611 rs_flush_buffer(tty);
1612 shutdown(info);
1613 info->event = 0;
1614 state->count = 0;
1615 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1616 info->tty = NULL;
1617 wake_up_interruptible(&info->open_wait);
1618}
1619
1620/*
1621 * ------------------------------------------------------------
1622 * rs_open() and friends
1623 * ------------------------------------------------------------
1624 */
1625static int block_til_ready(struct tty_struct *tty, struct file * filp,
1626 struct async_struct *info)
1627{
1628#ifdef DECLARE_WAITQUEUE
1629 DECLARE_WAITQUEUE(wait, current);
1630#else
1631 struct wait_queue wait = { current, NULL };
1632#endif
1633 struct serial_state *state = info->state;
1634 int retval;
1635 int do_clocal = 0, extra_count = 0;
1636 unsigned long flags;
1637
1638 /*
1639 * If the device is in the middle of being closed, then block
1640 * until it's done, and then try again.
1641 */
1642 if (tty_hung_up_p(filp) ||
1643 (info->flags & ASYNC_CLOSING)) {
1644 if (info->flags & ASYNC_CLOSING)
1645 interruptible_sleep_on(&info->close_wait);
1646#ifdef SERIAL_DO_RESTART
1647 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1648 -EAGAIN : -ERESTARTSYS);
1649#else
1650 return -EAGAIN;
1651#endif
1652 }
1653
1654 /*
1655 * If non-blocking mode is set, or the port is not enabled,
1656 * then make the check up front and then exit.
1657 */
1658 if ((filp->f_flags & O_NONBLOCK) ||
1659 (tty->flags & (1 << TTY_IO_ERROR))) {
1660 info->flags |= ASYNC_NORMAL_ACTIVE;
1661 return 0;
1662 }
1663
1664 if (tty->termios->c_cflag & CLOCAL)
1665 do_clocal = 1;
1666
1667 /*
1668 * Block waiting for the carrier detect and the line to become
1669 * free (i.e., not in use by the callout). While we are in
1670 * this loop, state->count is dropped by one, so that
1671 * rs_close() knows when to free things. We restore it upon
1672 * exit, either normal or abnormal.
1673 */
1674 retval = 0;
1675 add_wait_queue(&info->open_wait, &wait);
1676#ifdef SERIAL_DEBUG_OPEN
1677 printk("block_til_ready before block: ttys%d, count = %d\n",
1678 state->line, state->count);
1679#endif
1680 local_irq_save(flags);
1681 if (!tty_hung_up_p(filp)) {
1682 extra_count = 1;
1683 state->count--;
1684 }
1685 local_irq_restore(flags);
1686 info->blocked_open++;
1687 while (1) {
1688 local_irq_save(flags);
1689 if (tty->termios->c_cflag & CBAUD)
1690 rtsdtr_ctrl(SER_DTR|SER_RTS);
1691 local_irq_restore(flags);
1692 set_current_state(TASK_INTERRUPTIBLE);
1693 if (tty_hung_up_p(filp) ||
1694 !(info->flags & ASYNC_INITIALIZED)) {
1695#ifdef SERIAL_DO_RESTART
1696 if (info->flags & ASYNC_HUP_NOTIFY)
1697 retval = -EAGAIN;
1698 else
1699 retval = -ERESTARTSYS;
1700#else
1701 retval = -EAGAIN;
1702#endif
1703 break;
1704 }
1705 if (!(info->flags & ASYNC_CLOSING) &&
1706 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1707 break;
1708 if (signal_pending(current)) {
1709 retval = -ERESTARTSYS;
1710 break;
1711 }
1712#ifdef SERIAL_DEBUG_OPEN
1713 printk("block_til_ready blocking: ttys%d, count = %d\n",
1714 info->line, state->count);
1715#endif
1716 tty_unlock();
1717 schedule();
1718 tty_lock();
1719 }
1720 __set_current_state(TASK_RUNNING);
1721 remove_wait_queue(&info->open_wait, &wait);
1722 if (extra_count)
1723 state->count++;
1724 info->blocked_open--;
1725#ifdef SERIAL_DEBUG_OPEN
1726 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1727 info->line, state->count);
1728#endif
1729 if (retval)
1730 return retval;
1731 info->flags |= ASYNC_NORMAL_ACTIVE;
1732 return 0;
1733}
1734
1735static int get_async_struct(int line, struct async_struct **ret_info)
1736{
1737 struct async_struct *info;
1738 struct serial_state *sstate;
1739
1740 sstate = rs_table + line;
1741 sstate->count++;
1742 if (sstate->info) {
1743 *ret_info = sstate->info;
1744 return 0;
1745 }
1746 info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1747 if (!info) {
1748 sstate->count--;
1749 return -ENOMEM;
1750 }
1751#ifdef DECLARE_WAITQUEUE
1752 init_waitqueue_head(&info->open_wait);
1753 init_waitqueue_head(&info->close_wait);
1754 init_waitqueue_head(&info->delta_msr_wait);
1755#endif
1756 info->magic = SERIAL_MAGIC;
1757 info->port = sstate->port;
1758 info->flags = sstate->flags;
1759 info->xmit_fifo_size = sstate->xmit_fifo_size;
1760 info->line = line;
1761 tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1762 info->state = sstate;
1763 if (sstate->info) {
1764 kfree(info);
1765 *ret_info = sstate->info;
1766 return 0;
1767 }
1768 *ret_info = sstate->info = info;
1769 return 0;
1770}
1771
1772/*
1773 * This routine is called whenever a serial port is opened. It
1774 * enables interrupts for a serial port, linking in its async structure into
1775 * the IRQ chain. It also performs the serial-specific
1776 * initialization for the tty structure.
1777 */
1778static int rs_open(struct tty_struct *tty, struct file * filp)
1779{
1780 struct async_struct *info;
1781 int retval, line;
1782
1783 line = tty->index;
1784 if ((line < 0) || (line >= NR_PORTS)) {
1785 return -ENODEV;
1786 }
1787 retval = get_async_struct(line, &info);
1788 if (retval) {
1789 return retval;
1790 }
1791 tty->driver_data = info;
1792 info->tty = tty;
1793 if (serial_paranoia_check(info, tty->name, "rs_open"))
1794 return -ENODEV;
1795
1796#ifdef SERIAL_DEBUG_OPEN
1797 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1798#endif
1799 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1800
1801 /*
1802 * If the port is the middle of closing, bail out now
1803 */
1804 if (tty_hung_up_p(filp) ||
1805 (info->flags & ASYNC_CLOSING)) {
1806 if (info->flags & ASYNC_CLOSING)
1807 interruptible_sleep_on(&info->close_wait);
1808#ifdef SERIAL_DO_RESTART
1809 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1810 -EAGAIN : -ERESTARTSYS);
1811#else
1812 return -EAGAIN;
1813#endif
1814 }
1815
1816 /*
1817 * Start up serial port
1818 */
1819 retval = startup(info);
1820 if (retval) {
1821 return retval;
1822 }
1823
1824 retval = block_til_ready(tty, filp, info);
1825 if (retval) {
1826#ifdef SERIAL_DEBUG_OPEN
1827 printk("rs_open returning after block_til_ready with %d\n",
1828 retval);
1829#endif
1830 return retval;
1831 }
1832
1833#ifdef SERIAL_DEBUG_OPEN
1834 printk("rs_open %s successful...", tty->name);
1835#endif
1836 return 0;
1837}
1838
1839/*
1840 * /proc fs routines....
1841 */
1842
1843static inline void line_info(struct seq_file *m, struct serial_state *state)
1844{
1845 struct async_struct *info = state->info, scr_info;
1846 char stat_buf[30], control, status;
1847 unsigned long flags;
1848
1849 seq_printf(m, "%d: uart:amiga_builtin",state->line);
1850
1851 /*
1852 * Figure out the current RS-232 lines
1853 */
1854 if (!info) {
1855 info = &scr_info; /* This is just for serial_{in,out} */
1856
1857 info->magic = SERIAL_MAGIC;
1858 info->flags = state->flags;
1859 info->quot = 0;
1860 info->tty = NULL;
1861 }
1862 local_irq_save(flags);
1863 status = ciab.pra;
1864 control = info ? info->MCR : status;
1865 local_irq_restore(flags);
1866
1867 stat_buf[0] = 0;
1868 stat_buf[1] = 0;
1869 if(!(control & SER_RTS))
1870 strcat(stat_buf, "|RTS");
1871 if(!(status & SER_CTS))
1872 strcat(stat_buf, "|CTS");
1873 if(!(control & SER_DTR))
1874 strcat(stat_buf, "|DTR");
1875 if(!(status & SER_DSR))
1876 strcat(stat_buf, "|DSR");
1877 if(!(status & SER_DCD))
1878 strcat(stat_buf, "|CD");
1879
1880 if (info->quot) {
1881 seq_printf(m, " baud:%d", state->baud_base / info->quot);
1882 }
1883
1884 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1885
1886 if (state->icount.frame)
1887 seq_printf(m, " fe:%d", state->icount.frame);
1888
1889 if (state->icount.parity)
1890 seq_printf(m, " pe:%d", state->icount.parity);
1891
1892 if (state->icount.brk)
1893 seq_printf(m, " brk:%d", state->icount.brk);
1894
1895 if (state->icount.overrun)
1896 seq_printf(m, " oe:%d", state->icount.overrun);
1897
1898 /*
1899 * Last thing is the RS-232 status lines
1900 */
1901 seq_printf(m, " %s\n", stat_buf+1);
1902}
1903
1904static int rs_proc_show(struct seq_file *m, void *v)
1905{
1906 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1907 line_info(m, &rs_table[0]);
1908 return 0;
1909}
1910
1911static int rs_proc_open(struct inode *inode, struct file *file)
1912{
1913 return single_open(file, rs_proc_show, NULL);
1914}
1915
1916static const struct file_operations rs_proc_fops = {
1917 .owner = THIS_MODULE,
1918 .open = rs_proc_open,
1919 .read = seq_read,
1920 .llseek = seq_lseek,
1921 .release = single_release,
1922};
1923
1924/*
1925 * ---------------------------------------------------------------------
1926 * rs_init() and friends
1927 *
1928 * rs_init() is called at boot-time to initialize the serial driver.
1929 * ---------------------------------------------------------------------
1930 */
1931
1932/*
1933 * This routine prints out the appropriate serial driver version
1934 * number, and identifies which options were configured into this
1935 * driver.
1936 */
1937static void show_serial_version(void)
1938{
1939 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1940}
1941
1942
1943static const struct tty_operations serial_ops = {
1944 .open = rs_open,
1945 .close = rs_close,
1946 .write = rs_write,
1947 .put_char = rs_put_char,
1948 .flush_chars = rs_flush_chars,
1949 .write_room = rs_write_room,
1950 .chars_in_buffer = rs_chars_in_buffer,
1951 .flush_buffer = rs_flush_buffer,
1952 .ioctl = rs_ioctl,
1953 .throttle = rs_throttle,
1954 .unthrottle = rs_unthrottle,
1955 .set_termios = rs_set_termios,
1956 .stop = rs_stop,
1957 .start = rs_start,
1958 .hangup = rs_hangup,
1959 .break_ctl = rs_break,
1960 .send_xchar = rs_send_xchar,
1961 .wait_until_sent = rs_wait_until_sent,
1962 .tiocmget = rs_tiocmget,
1963 .tiocmset = rs_tiocmset,
1964 .get_icount = rs_get_icount,
1965 .proc_fops = &rs_proc_fops,
1966};
1967
1968/*
1969 * The serial driver boot-time initialization code!
1970 */
1971static int __init amiga_serial_probe(struct platform_device *pdev)
1972{
1973 unsigned long flags;
1974 struct serial_state * state;
1975 int error;
1976
1977 serial_driver = alloc_tty_driver(1);
1978 if (!serial_driver)
1979 return -ENOMEM;
1980
1981 IRQ_ports = NULL;
1982
1983 show_serial_version();
1984
1985 /* Initialize the tty_driver structure */
1986
1987 serial_driver->owner = THIS_MODULE;
1988 serial_driver->driver_name = "amiserial";
1989 serial_driver->name = "ttyS";
1990 serial_driver->major = TTY_MAJOR;
1991 serial_driver->minor_start = 64;
1992 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1993 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1994 serial_driver->init_termios = tty_std_termios;
1995 serial_driver->init_termios.c_cflag =
1996 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1997 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1998 tty_set_operations(serial_driver, &serial_ops);
1999
2000 error = tty_register_driver(serial_driver);
2001 if (error)
2002 goto fail_put_tty_driver;
2003
2004 state = rs_table;
2005 state->magic = SSTATE_MAGIC;
2006 state->port = (int)&custom.serdatr; /* Just to give it a value */
2007 state->line = 0;
2008 state->custom_divisor = 0;
2009 state->close_delay = 5*HZ/10;
2010 state->closing_wait = 30*HZ;
2011 state->icount.cts = state->icount.dsr =
2012 state->icount.rng = state->icount.dcd = 0;
2013 state->icount.rx = state->icount.tx = 0;
2014 state->icount.frame = state->icount.parity = 0;
2015 state->icount.overrun = state->icount.brk = 0;
2016
2017 printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2018 state->line);
2019
2020 /* Hardware set up */
2021
2022 state->baud_base = amiga_colorclock;
2023 state->xmit_fifo_size = 1;
2024
2025 /* set ISRs, and then disable the rx interrupts */
2026 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2027 if (error)
2028 goto fail_unregister;
2029
2030 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED,
2031 "serial RX", state);
2032 if (error)
2033 goto fail_free_irq;
2034
2035 local_irq_save(flags);
2036
2037 /* turn off Rx and Tx interrupts */
2038 custom.intena = IF_RBF | IF_TBE;
2039 mb();
2040
2041 /* clear any pending interrupt */
2042 custom.intreq = IF_RBF | IF_TBE;
2043 mb();
2044
2045 local_irq_restore(flags);
2046
2047 /*
2048 * set the appropriate directions for the modem control flags,
2049 * and clear RTS and DTR
2050 */
2051 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2052 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2053
2054 platform_set_drvdata(pdev, state);
2055
2056 return 0;
2057
2058fail_free_irq:
2059 free_irq(IRQ_AMIGA_TBE, state);
2060fail_unregister:
2061 tty_unregister_driver(serial_driver);
2062fail_put_tty_driver:
2063 put_tty_driver(serial_driver);
2064 return error;
2065}
2066
2067static int __exit amiga_serial_remove(struct platform_device *pdev)
2068{
2069 int error;
2070 struct serial_state *state = platform_get_drvdata(pdev);
2071 struct async_struct *info = state->info;
2072
2073 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2074 tasklet_kill(&info->tlet);
2075 if ((error = tty_unregister_driver(serial_driver)))
2076 printk("SERIAL: failed to unregister serial driver (%d)\n",
2077 error);
2078 put_tty_driver(serial_driver);
2079
2080 rs_table[0].info = NULL;
2081 kfree(info);
2082
2083 free_irq(IRQ_AMIGA_TBE, rs_table);
2084 free_irq(IRQ_AMIGA_RBF, rs_table);
2085
2086 platform_set_drvdata(pdev, NULL);
2087
2088 return error;
2089}
2090
2091static struct platform_driver amiga_serial_driver = {
2092 .remove = __exit_p(amiga_serial_remove),
2093 .driver = {
2094 .name = "amiga-serial",
2095 .owner = THIS_MODULE,
2096 },
2097};
2098
2099static int __init amiga_serial_init(void)
2100{
2101 return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
2102}
2103
2104module_init(amiga_serial_init);
2105
2106static void __exit amiga_serial_exit(void)
2107{
2108 platform_driver_unregister(&amiga_serial_driver);
2109}
2110
2111module_exit(amiga_serial_exit);
2112
2113
2114#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2115
2116/*
2117 * ------------------------------------------------------------
2118 * Serial console driver
2119 * ------------------------------------------------------------
2120 */
2121
2122static void amiga_serial_putc(char c)
2123{
2124 custom.serdat = (unsigned char)c | 0x100;
2125 while (!(custom.serdatr & 0x2000))
2126 barrier();
2127}
2128
2129/*
2130 * Print a string to the serial port trying not to disturb
2131 * any possible real use of the port...
2132 *
2133 * The console must be locked when we get here.
2134 */
2135static void serial_console_write(struct console *co, const char *s,
2136 unsigned count)
2137{
2138 unsigned short intena = custom.intenar;
2139
2140 custom.intena = IF_TBE;
2141
2142 while (count--) {
2143 if (*s == '\n')
2144 amiga_serial_putc('\r');
2145 amiga_serial_putc(*s++);
2146 }
2147
2148 custom.intena = IF_SETCLR | (intena & IF_TBE);
2149}
2150
2151static struct tty_driver *serial_console_device(struct console *c, int *index)
2152{
2153 *index = 0;
2154 return serial_driver;
2155}
2156
2157static struct console sercons = {
2158 .name = "ttyS",
2159 .write = serial_console_write,
2160 .device = serial_console_device,
2161 .flags = CON_PRINTBUFFER,
2162 .index = -1,
2163};
2164
2165/*
2166 * Register console.
2167 */
2168static int __init amiserial_console_init(void)
2169{
2170 register_console(&sercons);
2171 return 0;
2172}
2173console_initcall(amiserial_console_init);
2174
2175#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
2176
2177MODULE_LICENSE("GPL");
2178MODULE_ALIAS("platform:amiga-serial");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-27 17:09:51 -0500