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1/*
2 * Serial driver for the amiga builtin port.
3 *
4 * This code was created by taking serial.c version 4.30 from kernel
5 * release 2.3.22, replacing all hardware related stuff with the
6 * corresponding amiga hardware actions, and removing all irrelevant
7 * code. As a consequence, it uses many of the constants and names
8 * associated with the registers and bits of 16550 compatible UARTS -
9 * but only to keep track of status, etc in the state variables. It
10 * was done this was to make it easier to keep the code in line with
11 * (non hardware specific) changes to serial.c.
12 *
13 * The port is registered with the tty driver as minor device 64, and
14 * therefore other ports should should only use 65 upwards.
15 *
16 * Richard Lucock 28/12/99
17 *
18 * Copyright (C) 1991, 1992 Linus Torvalds
19 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
20 * 1998, 1999 Theodore Ts'o
21 *
22 */
23
24/*
25 * Serial driver configuration section. Here are the various options:
26 *
27 * SERIAL_PARANOIA_CHECK
28 * Check the magic number for the async_structure where
29 * ever possible.
30 */
31
32#include <linux/delay.h>
33
34#undef SERIAL_PARANOIA_CHECK
35#define SERIAL_DO_RESTART
36
37/* Set of debugging defines */
38
39#undef SERIAL_DEBUG_INTR
40#undef SERIAL_DEBUG_OPEN
41#undef SERIAL_DEBUG_FLOW
42#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
43
44/* Sanity checks */
45
46#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
47#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
48 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
49#else
50#define DBG_CNT(s)
51#endif
52
53/*
54 * End of serial driver configuration section.
55 */
56
57#include <linux/module.h>
58
59#include <linux/types.h>
60#include <linux/serial.h>
61#include <linux/serial_reg.h>
62static char *serial_version = "4.30";
63
64#include <linux/errno.h>
65#include <linux/signal.h>
66#include <linux/sched.h>
67#include <linux/kernel.h>
68#include <linux/timer.h>
69#include <linux/interrupt.h>
70#include <linux/tty.h>
71#include <linux/tty_flip.h>
72#include <linux/circ_buf.h>
73#include <linux/console.h>
74#include <linux/major.h>
75#include <linux/string.h>
76#include <linux/fcntl.h>
77#include <linux/ptrace.h>
78#include <linux/ioport.h>
79#include <linux/mm.h>
80#include <linux/seq_file.h>
81#include <linux/slab.h>
82#include <linux/init.h>
83#include <linux/bitops.h>
84#include <linux/platform_device.h>
85
86#include <asm/setup.h>
87
88
89#include <asm/irq.h>
90
91#include <asm/amigahw.h>
92#include <asm/amigaints.h>
93
94struct serial_state {
95 struct tty_port tport;
96 struct circ_buf xmit;
97 struct async_icount icount;
98
99 unsigned long port;
100 int baud_base;
101 int xmit_fifo_size;
102 int custom_divisor;
103 int read_status_mask;
104 int ignore_status_mask;
105 int timeout;
106 int quot;
107 int IER; /* Interrupt Enable Register */
108 int MCR; /* Modem control register */
109 int x_char; /* xon/xoff character */
110};
111
112#define custom amiga_custom
113static char *serial_name = "Amiga-builtin serial driver";
114
115static struct tty_driver *serial_driver;
116
117/* number of characters left in xmit buffer before we ask for more */
118#define WAKEUP_CHARS 256
119
120static unsigned char current_ctl_bits;
121
122static void change_speed(struct tty_struct *tty, struct serial_state *info,
123 struct ktermios *old);
124static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
125
126
127static struct serial_state rs_table[1];
128
129#define NR_PORTS ARRAY_SIZE(rs_table)
130
131#include <asm/uaccess.h>
132
133#define serial_isroot() (capable(CAP_SYS_ADMIN))
134
135
136static inline int serial_paranoia_check(struct serial_state *info,
137 char *name, const char *routine)
138{
139#ifdef SERIAL_PARANOIA_CHECK
140 static const char *badmagic =
141 "Warning: bad magic number for serial struct (%s) in %s\n";
142 static const char *badinfo =
143 "Warning: null async_struct for (%s) in %s\n";
144
145 if (!info) {
146 printk(badinfo, name, routine);
147 return 1;
148 }
149 if (info->magic != SERIAL_MAGIC) {
150 printk(badmagic, name, routine);
151 return 1;
152 }
153#endif
154 return 0;
155}
156
157/* some serial hardware definitions */
158#define SDR_OVRUN (1<<15)
159#define SDR_RBF (1<<14)
160#define SDR_TBE (1<<13)
161#define SDR_TSRE (1<<12)
162
163#define SERPER_PARENB (1<<15)
164
165#define AC_SETCLR (1<<15)
166#define AC_UARTBRK (1<<11)
167
168#define SER_DTR (1<<7)
169#define SER_RTS (1<<6)
170#define SER_DCD (1<<5)
171#define SER_CTS (1<<4)
172#define SER_DSR (1<<3)
173
174static __inline__ void rtsdtr_ctrl(int bits)
175{
176 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
177}
178
179/*
180 * ------------------------------------------------------------
181 * rs_stop() and rs_start()
182 *
183 * This routines are called before setting or resetting tty->stopped.
184 * They enable or disable transmitter interrupts, as necessary.
185 * ------------------------------------------------------------
186 */
187static void rs_stop(struct tty_struct *tty)
188{
189 struct serial_state *info = tty->driver_data;
190 unsigned long flags;
191
192 if (serial_paranoia_check(info, tty->name, "rs_stop"))
193 return;
194
195 local_irq_save(flags);
196 if (info->IER & UART_IER_THRI) {
197 info->IER &= ~UART_IER_THRI;
198 /* disable Tx interrupt and remove any pending interrupts */
199 custom.intena = IF_TBE;
200 mb();
201 custom.intreq = IF_TBE;
202 mb();
203 }
204 local_irq_restore(flags);
205}
206
207static void rs_start(struct tty_struct *tty)
208{
209 struct serial_state *info = tty->driver_data;
210 unsigned long flags;
211
212 if (serial_paranoia_check(info, tty->name, "rs_start"))
213 return;
214
215 local_irq_save(flags);
216 if (info->xmit.head != info->xmit.tail
217 && info->xmit.buf
218 && !(info->IER & UART_IER_THRI)) {
219 info->IER |= UART_IER_THRI;
220 custom.intena = IF_SETCLR | IF_TBE;
221 mb();
222 /* set a pending Tx Interrupt, transmitter should restart now */
223 custom.intreq = IF_SETCLR | IF_TBE;
224 mb();
225 }
226 local_irq_restore(flags);
227}
228
229/*
230 * ----------------------------------------------------------------------
231 *
232 * Here starts the interrupt handling routines. All of the following
233 * subroutines are declared as inline and are folded into
234 * rs_interrupt(). They were separated out for readability's sake.
235 *
236 * Note: rs_interrupt() is a "fast" interrupt, which means that it
237 * runs with interrupts turned off. People who may want to modify
238 * rs_interrupt() should try to keep the interrupt handler as fast as
239 * possible. After you are done making modifications, it is not a bad
240 * idea to do:
241 *
242 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
243 *
244 * and look at the resulting assemble code in serial.s.
245 *
246 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
247 * -----------------------------------------------------------------------
248 */
249
250static void receive_chars(struct serial_state *info)
251{
252 int status;
253 int serdatr;
254 struct tty_struct *tty = info->tport.tty;
255 unsigned char ch, flag;
256 struct async_icount *icount;
257 int oe = 0;
258
259 icount = &info->icount;
260
261 status = UART_LSR_DR; /* We obviously have a character! */
262 serdatr = custom.serdatr;
263 mb();
264 custom.intreq = IF_RBF;
265 mb();
266
267 if((serdatr & 0x1ff) == 0)
268 status |= UART_LSR_BI;
269 if(serdatr & SDR_OVRUN)
270 status |= UART_LSR_OE;
271
272 ch = serdatr & 0xff;
273 icount->rx++;
274
275#ifdef SERIAL_DEBUG_INTR
276 printk("DR%02x:%02x...", ch, status);
277#endif
278 flag = TTY_NORMAL;
279
280 /*
281 * We don't handle parity or frame errors - but I have left
282 * the code in, since I'm not sure that the errors can't be
283 * detected.
284 */
285
286 if (status & (UART_LSR_BI | UART_LSR_PE |
287 UART_LSR_FE | UART_LSR_OE)) {
288 /*
289 * For statistics only
290 */
291 if (status & UART_LSR_BI) {
292 status &= ~(UART_LSR_FE | UART_LSR_PE);
293 icount->brk++;
294 } else if (status & UART_LSR_PE)
295 icount->parity++;
296 else if (status & UART_LSR_FE)
297 icount->frame++;
298 if (status & UART_LSR_OE)
299 icount->overrun++;
300
301 /*
302 * Now check to see if character should be
303 * ignored, and mask off conditions which
304 * should be ignored.
305 */
306 if (status & info->ignore_status_mask)
307 goto out;
308
309 status &= info->read_status_mask;
310
311 if (status & (UART_LSR_BI)) {
312#ifdef SERIAL_DEBUG_INTR
313 printk("handling break....");
314#endif
315 flag = TTY_BREAK;
316 if (info->tport.flags & ASYNC_SAK)
317 do_SAK(tty);
318 } else if (status & UART_LSR_PE)
319 flag = TTY_PARITY;
320 else if (status & UART_LSR_FE)
321 flag = TTY_FRAME;
322 if (status & UART_LSR_OE) {
323 /*
324 * Overrun is special, since it's
325 * reported immediately, and doesn't
326 * affect the current character
327 */
328 oe = 1;
329 }
330 }
331 tty_insert_flip_char(tty, ch, flag);
332 if (oe == 1)
333 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
334 tty_flip_buffer_push(tty);
335out:
336 return;
337}
338
339static void transmit_chars(struct serial_state *info)
340{
341 custom.intreq = IF_TBE;
342 mb();
343 if (info->x_char) {
344 custom.serdat = info->x_char | 0x100;
345 mb();
346 info->icount.tx++;
347 info->x_char = 0;
348 return;
349 }
350 if (info->xmit.head == info->xmit.tail
351 || info->tport.tty->stopped
352 || info->tport.tty->hw_stopped) {
353 info->IER &= ~UART_IER_THRI;
354 custom.intena = IF_TBE;
355 mb();
356 return;
357 }
358
359 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
360 mb();
361 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
362 info->icount.tx++;
363
364 if (CIRC_CNT(info->xmit.head,
365 info->xmit.tail,
366 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
367 tty_wakeup(info->tport.tty);
368
369#ifdef SERIAL_DEBUG_INTR
370 printk("THRE...");
371#endif
372 if (info->xmit.head == info->xmit.tail) {
373 custom.intena = IF_TBE;
374 mb();
375 info->IER &= ~UART_IER_THRI;
376 }
377}
378
379static void check_modem_status(struct serial_state *info)
380{
381 struct tty_port *port = &info->tport;
382 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
383 unsigned char dstatus;
384 struct async_icount *icount;
385
386 /* Determine bits that have changed */
387 dstatus = status ^ current_ctl_bits;
388 current_ctl_bits = status;
389
390 if (dstatus) {
391 icount = &info->icount;
392 /* update input line counters */
393 if (dstatus & SER_DSR)
394 icount->dsr++;
395 if (dstatus & SER_DCD) {
396 icount->dcd++;
397#ifdef CONFIG_HARD_PPS
398 if ((port->flags & ASYNC_HARDPPS_CD) &&
399 !(status & SER_DCD))
400 hardpps();
401#endif
402 }
403 if (dstatus & SER_CTS)
404 icount->cts++;
405 wake_up_interruptible(&port->delta_msr_wait);
406 }
407
408 if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
409#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
410 printk("ttyS%d CD now %s...", info->line,
411 (!(status & SER_DCD)) ? "on" : "off");
412#endif
413 if (!(status & SER_DCD))
414 wake_up_interruptible(&port->open_wait);
415 else {
416#ifdef SERIAL_DEBUG_OPEN
417 printk("doing serial hangup...");
418#endif
419 if (port->tty)
420 tty_hangup(port->tty);
421 }
422 }
423 if (port->flags & ASYNC_CTS_FLOW) {
424 if (port->tty->hw_stopped) {
425 if (!(status & SER_CTS)) {
426#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
427 printk("CTS tx start...");
428#endif
429 port->tty->hw_stopped = 0;
430 info->IER |= UART_IER_THRI;
431 custom.intena = IF_SETCLR | IF_TBE;
432 mb();
433 /* set a pending Tx Interrupt, transmitter should restart now */
434 custom.intreq = IF_SETCLR | IF_TBE;
435 mb();
436 tty_wakeup(port->tty);
437 return;
438 }
439 } else {
440 if ((status & SER_CTS)) {
441#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
442 printk("CTS tx stop...");
443#endif
444 port->tty->hw_stopped = 1;
445 info->IER &= ~UART_IER_THRI;
446 /* disable Tx interrupt and remove any pending interrupts */
447 custom.intena = IF_TBE;
448 mb();
449 custom.intreq = IF_TBE;
450 mb();
451 }
452 }
453 }
454}
455
456static irqreturn_t ser_vbl_int( int irq, void *data)
457{
458 /* vbl is just a periodic interrupt we tie into to update modem status */
459 struct serial_state *info = data;
460 /*
461 * TBD - is it better to unregister from this interrupt or to
462 * ignore it if MSI is clear ?
463 */
464 if(info->IER & UART_IER_MSI)
465 check_modem_status(info);
466 return IRQ_HANDLED;
467}
468
469static irqreturn_t ser_rx_int(int irq, void *dev_id)
470{
471 struct serial_state *info = dev_id;
472
473#ifdef SERIAL_DEBUG_INTR
474 printk("ser_rx_int...");
475#endif
476
477 if (!info->tport.tty)
478 return IRQ_NONE;
479
480 receive_chars(info);
481#ifdef SERIAL_DEBUG_INTR
482 printk("end.\n");
483#endif
484 return IRQ_HANDLED;
485}
486
487static irqreturn_t ser_tx_int(int irq, void *dev_id)
488{
489 struct serial_state *info = dev_id;
490
491 if (custom.serdatr & SDR_TBE) {
492#ifdef SERIAL_DEBUG_INTR
493 printk("ser_tx_int...");
494#endif
495
496 if (!info->tport.tty)
497 return IRQ_NONE;
498
499 transmit_chars(info);
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 * ---------------------------------------------------------------
515 * Low level utility subroutines for the serial driver: routines to
516 * figure out the appropriate timeout for an interrupt chain, routines
517 * to initialize and startup a serial port, and routines to shutdown a
518 * serial port. Useful stuff like that.
519 * ---------------------------------------------------------------
520 */
521
522static int startup(struct tty_struct *tty, struct serial_state *info)
523{
524 struct tty_port *port = &info->tport;
525 unsigned long flags;
526 int retval=0;
527 unsigned long page;
528
529 page = get_zeroed_page(GFP_KERNEL);
530 if (!page)
531 return -ENOMEM;
532
533 local_irq_save(flags);
534
535 if (port->flags & ASYNC_INITIALIZED) {
536 free_page(page);
537 goto errout;
538 }
539
540 if (info->xmit.buf)
541 free_page(page);
542 else
543 info->xmit.buf = (unsigned char *) page;
544
545#ifdef SERIAL_DEBUG_OPEN
546 printk("starting up ttys%d ...", info->line);
547#endif
548
549 /* Clear anything in the input buffer */
550
551 custom.intreq = IF_RBF;
552 mb();
553
554 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
555 if (retval) {
556 if (serial_isroot()) {
557 set_bit(TTY_IO_ERROR, &tty->flags);
558 retval = 0;
559 }
560 goto errout;
561 }
562
563 /* enable both Rx and Tx interrupts */
564 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
565 mb();
566 info->IER = UART_IER_MSI;
567
568 /* remember current state of the DCD and CTS bits */
569 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
570
571 info->MCR = 0;
572 if (C_BAUD(tty))
573 info->MCR = SER_DTR | SER_RTS;
574 rtsdtr_ctrl(info->MCR);
575
576 clear_bit(TTY_IO_ERROR, &tty->flags);
577 info->xmit.head = info->xmit.tail = 0;
578
579 /*
580 * Set up the tty->alt_speed kludge
581 */
582 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
583 tty->alt_speed = 57600;
584 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
585 tty->alt_speed = 115200;
586 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
587 tty->alt_speed = 230400;
588 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
589 tty->alt_speed = 460800;
590
591 /*
592 * and set the speed of the serial port
593 */
594 change_speed(tty, info, NULL);
595
596 port->flags |= ASYNC_INITIALIZED;
597 local_irq_restore(flags);
598 return 0;
599
600errout:
601 local_irq_restore(flags);
602 return retval;
603}
604
605/*
606 * This routine will shutdown a serial port; interrupts are disabled, and
607 * DTR is dropped if the hangup on close termio flag is on.
608 */
609static void shutdown(struct tty_struct *tty, struct serial_state *info)
610{
611 unsigned long flags;
612 struct serial_state *state;
613
614 if (!(info->tport.flags & ASYNC_INITIALIZED))
615 return;
616
617 state = info;
618
619#ifdef SERIAL_DEBUG_OPEN
620 printk("Shutting down serial port %d ....\n", info->line);
621#endif
622
623 local_irq_save(flags); /* Disable interrupts */
624
625 /*
626 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
627 * here so the queue might never be waken up
628 */
629 wake_up_interruptible(&info->tport.delta_msr_wait);
630
631 /*
632 * Free the IRQ, if necessary
633 */
634 free_irq(IRQ_AMIGA_VERTB, info);
635
636 if (info->xmit.buf) {
637 free_page((unsigned long) info->xmit.buf);
638 info->xmit.buf = NULL;
639 }
640
641 info->IER = 0;
642 custom.intena = IF_RBF | IF_TBE;
643 mb();
644
645 /* disable break condition */
646 custom.adkcon = AC_UARTBRK;
647 mb();
648
649 if (tty->termios->c_cflag & HUPCL)
650 info->MCR &= ~(SER_DTR|SER_RTS);
651 rtsdtr_ctrl(info->MCR);
652
653 set_bit(TTY_IO_ERROR, &tty->flags);
654
655 info->tport.flags &= ~ASYNC_INITIALIZED;
656 local_irq_restore(flags);
657}
658
659
660/*
661 * This routine is called to set the UART divisor registers to match
662 * the specified baud rate for a serial port.
663 */
664static void change_speed(struct tty_struct *tty, struct serial_state *info,
665 struct ktermios *old_termios)
666{
667 struct tty_port *port = &info->tport;
668 int quot = 0, baud_base, baud;
669 unsigned cflag, cval = 0;
670 int bits;
671 unsigned long flags;
672
673 cflag = tty->termios->c_cflag;
674
675 /* Byte size is always 8 bits plus parity bit if requested */
676
677 cval = 3; bits = 10;
678 if (cflag & CSTOPB) {
679 cval |= 0x04;
680 bits++;
681 }
682 if (cflag & PARENB) {
683 cval |= UART_LCR_PARITY;
684 bits++;
685 }
686 if (!(cflag & PARODD))
687 cval |= UART_LCR_EPAR;
688#ifdef CMSPAR
689 if (cflag & CMSPAR)
690 cval |= UART_LCR_SPAR;
691#endif
692
693 /* Determine divisor based on baud rate */
694 baud = tty_get_baud_rate(tty);
695 if (!baud)
696 baud = 9600; /* B0 transition handled in rs_set_termios */
697 baud_base = info->baud_base;
698 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
699 quot = info->custom_divisor;
700 else {
701 if (baud == 134)
702 /* Special case since 134 is really 134.5 */
703 quot = (2*baud_base / 269);
704 else if (baud)
705 quot = baud_base / baud;
706 }
707 /* If the quotient is zero refuse the change */
708 if (!quot && old_termios) {
709 /* FIXME: Will need updating for new tty in the end */
710 tty->termios->c_cflag &= ~CBAUD;
711 tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
712 baud = tty_get_baud_rate(tty);
713 if (!baud)
714 baud = 9600;
715 if (baud == 38400 &&
716 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
717 quot = info->custom_divisor;
718 else {
719 if (baud == 134)
720 /* Special case since 134 is really 134.5 */
721 quot = (2*baud_base / 269);
722 else if (baud)
723 quot = baud_base / baud;
724 }
725 }
726 /* As a last resort, if the quotient is zero, default to 9600 bps */
727 if (!quot)
728 quot = baud_base / 9600;
729 info->quot = quot;
730 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
731 info->timeout += HZ/50; /* Add .02 seconds of slop */
732
733 /* CTS flow control flag and modem status interrupts */
734 info->IER &= ~UART_IER_MSI;
735 if (port->flags & ASYNC_HARDPPS_CD)
736 info->IER |= UART_IER_MSI;
737 if (cflag & CRTSCTS) {
738 port->flags |= ASYNC_CTS_FLOW;
739 info->IER |= UART_IER_MSI;
740 } else
741 port->flags &= ~ASYNC_CTS_FLOW;
742 if (cflag & CLOCAL)
743 port->flags &= ~ASYNC_CHECK_CD;
744 else {
745 port->flags |= ASYNC_CHECK_CD;
746 info->IER |= UART_IER_MSI;
747 }
748 /* TBD:
749 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
750 */
751
752 /*
753 * Set up parity check flag
754 */
755
756 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
757 if (I_INPCK(tty))
758 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
759 if (I_BRKINT(tty) || I_PARMRK(tty))
760 info->read_status_mask |= UART_LSR_BI;
761
762 /*
763 * Characters to ignore
764 */
765 info->ignore_status_mask = 0;
766 if (I_IGNPAR(tty))
767 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
768 if (I_IGNBRK(tty)) {
769 info->ignore_status_mask |= UART_LSR_BI;
770 /*
771 * If we're ignore parity and break indicators, ignore
772 * overruns too. (For real raw support).
773 */
774 if (I_IGNPAR(tty))
775 info->ignore_status_mask |= UART_LSR_OE;
776 }
777 /*
778 * !!! ignore all characters if CREAD is not set
779 */
780 if ((cflag & CREAD) == 0)
781 info->ignore_status_mask |= UART_LSR_DR;
782 local_irq_save(flags);
783
784 {
785 short serper;
786
787 /* Set up the baud rate */
788 serper = quot - 1;
789
790 /* Enable or disable parity bit */
791
792 if(cval & UART_LCR_PARITY)
793 serper |= (SERPER_PARENB);
794
795 custom.serper = serper;
796 mb();
797 }
798
799 local_irq_restore(flags);
800}
801
802static int rs_put_char(struct tty_struct *tty, unsigned char ch)
803{
804 struct serial_state *info;
805 unsigned long flags;
806
807 info = tty->driver_data;
808
809 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
810 return 0;
811
812 if (!info->xmit.buf)
813 return 0;
814
815 local_irq_save(flags);
816 if (CIRC_SPACE(info->xmit.head,
817 info->xmit.tail,
818 SERIAL_XMIT_SIZE) == 0) {
819 local_irq_restore(flags);
820 return 0;
821 }
822
823 info->xmit.buf[info->xmit.head++] = ch;
824 info->xmit.head &= SERIAL_XMIT_SIZE-1;
825 local_irq_restore(flags);
826 return 1;
827}
828
829static void rs_flush_chars(struct tty_struct *tty)
830{
831 struct serial_state *info = tty->driver_data;
832 unsigned long flags;
833
834 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
835 return;
836
837 if (info->xmit.head == info->xmit.tail
838 || tty->stopped
839 || tty->hw_stopped
840 || !info->xmit.buf)
841 return;
842
843 local_irq_save(flags);
844 info->IER |= UART_IER_THRI;
845 custom.intena = IF_SETCLR | IF_TBE;
846 mb();
847 /* set a pending Tx Interrupt, transmitter should restart now */
848 custom.intreq = IF_SETCLR | IF_TBE;
849 mb();
850 local_irq_restore(flags);
851}
852
853static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
854{
855 int c, ret = 0;
856 struct serial_state *info = tty->driver_data;
857 unsigned long flags;
858
859 if (serial_paranoia_check(info, tty->name, "rs_write"))
860 return 0;
861
862 if (!info->xmit.buf)
863 return 0;
864
865 local_irq_save(flags);
866 while (1) {
867 c = CIRC_SPACE_TO_END(info->xmit.head,
868 info->xmit.tail,
869 SERIAL_XMIT_SIZE);
870 if (count < c)
871 c = count;
872 if (c <= 0) {
873 break;
874 }
875 memcpy(info->xmit.buf + info->xmit.head, buf, c);
876 info->xmit.head = ((info->xmit.head + c) &
877 (SERIAL_XMIT_SIZE-1));
878 buf += c;
879 count -= c;
880 ret += c;
881 }
882 local_irq_restore(flags);
883
884 if (info->xmit.head != info->xmit.tail
885 && !tty->stopped
886 && !tty->hw_stopped
887 && !(info->IER & UART_IER_THRI)) {
888 info->IER |= UART_IER_THRI;
889 local_irq_disable();
890 custom.intena = IF_SETCLR | IF_TBE;
891 mb();
892 /* set a pending Tx Interrupt, transmitter should restart now */
893 custom.intreq = IF_SETCLR | IF_TBE;
894 mb();
895 local_irq_restore(flags);
896 }
897 return ret;
898}
899
900static int rs_write_room(struct tty_struct *tty)
901{
902 struct serial_state *info = tty->driver_data;
903
904 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
905 return 0;
906 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
907}
908
909static int rs_chars_in_buffer(struct tty_struct *tty)
910{
911 struct serial_state *info = tty->driver_data;
912
913 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
914 return 0;
915 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
916}
917
918static void rs_flush_buffer(struct tty_struct *tty)
919{
920 struct serial_state *info = tty->driver_data;
921 unsigned long flags;
922
923 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
924 return;
925 local_irq_save(flags);
926 info->xmit.head = info->xmit.tail = 0;
927 local_irq_restore(flags);
928 tty_wakeup(tty);
929}
930
931/*
932 * This function is used to send a high-priority XON/XOFF character to
933 * the device
934 */
935static void rs_send_xchar(struct tty_struct *tty, char ch)
936{
937 struct serial_state *info = tty->driver_data;
938 unsigned long flags;
939
940 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
941 return;
942
943 info->x_char = ch;
944 if (ch) {
945 /* Make sure transmit interrupts are on */
946
947 /* Check this ! */
948 local_irq_save(flags);
949 if(!(custom.intenar & IF_TBE)) {
950 custom.intena = IF_SETCLR | IF_TBE;
951 mb();
952 /* set a pending Tx Interrupt, transmitter should restart now */
953 custom.intreq = IF_SETCLR | IF_TBE;
954 mb();
955 }
956 local_irq_restore(flags);
957
958 info->IER |= UART_IER_THRI;
959 }
960}
961
962/*
963 * ------------------------------------------------------------
964 * rs_throttle()
965 *
966 * This routine is called by the upper-layer tty layer to signal that
967 * incoming characters should be throttled.
968 * ------------------------------------------------------------
969 */
970static void rs_throttle(struct tty_struct * tty)
971{
972 struct serial_state *info = tty->driver_data;
973 unsigned long flags;
974#ifdef SERIAL_DEBUG_THROTTLE
975 char buf[64];
976
977 printk("throttle %s: %d....\n", tty_name(tty, buf),
978 tty->ldisc.chars_in_buffer(tty));
979#endif
980
981 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
982 return;
983
984 if (I_IXOFF(tty))
985 rs_send_xchar(tty, STOP_CHAR(tty));
986
987 if (tty->termios->c_cflag & CRTSCTS)
988 info->MCR &= ~SER_RTS;
989
990 local_irq_save(flags);
991 rtsdtr_ctrl(info->MCR);
992 local_irq_restore(flags);
993}
994
995static void rs_unthrottle(struct tty_struct * tty)
996{
997 struct serial_state *info = tty->driver_data;
998 unsigned long flags;
999#ifdef SERIAL_DEBUG_THROTTLE
1000 char buf[64];
1001
1002 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1003 tty->ldisc.chars_in_buffer(tty));
1004#endif
1005
1006 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1007 return;
1008
1009 if (I_IXOFF(tty)) {
1010 if (info->x_char)
1011 info->x_char = 0;
1012 else
1013 rs_send_xchar(tty, START_CHAR(tty));
1014 }
1015 if (tty->termios->c_cflag & CRTSCTS)
1016 info->MCR |= SER_RTS;
1017 local_irq_save(flags);
1018 rtsdtr_ctrl(info->MCR);
1019 local_irq_restore(flags);
1020}
1021
1022/*
1023 * ------------------------------------------------------------
1024 * rs_ioctl() and friends
1025 * ------------------------------------------------------------
1026 */
1027
1028static int get_serial_info(struct tty_struct *tty, struct serial_state *state,
1029 struct serial_struct __user * retinfo)
1030{
1031 struct serial_struct tmp;
1032
1033 if (!retinfo)
1034 return -EFAULT;
1035 memset(&tmp, 0, sizeof(tmp));
1036 tty_lock();
1037 tmp.line = tty->index;
1038 tmp.port = state->port;
1039 tmp.flags = state->tport.flags;
1040 tmp.xmit_fifo_size = state->xmit_fifo_size;
1041 tmp.baud_base = state->baud_base;
1042 tmp.close_delay = state->tport.close_delay;
1043 tmp.closing_wait = state->tport.closing_wait;
1044 tmp.custom_divisor = state->custom_divisor;
1045 tty_unlock();
1046 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1047 return -EFAULT;
1048 return 0;
1049}
1050
1051static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
1052 struct serial_struct __user * new_info)
1053{
1054 struct tty_port *port = &state->tport;
1055 struct serial_struct new_serial;
1056 bool change_spd;
1057 int retval = 0;
1058
1059 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1060 return -EFAULT;
1061
1062 tty_lock();
1063 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
1064 new_serial.custom_divisor != state->custom_divisor;
1065 if (new_serial.irq || new_serial.port != state->port ||
1066 new_serial.xmit_fifo_size != state->xmit_fifo_size) {
1067 tty_unlock();
1068 return -EINVAL;
1069 }
1070
1071 if (!serial_isroot()) {
1072 if ((new_serial.baud_base != state->baud_base) ||
1073 (new_serial.close_delay != port->close_delay) ||
1074 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1075 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1076 (port->flags & ~ASYNC_USR_MASK))) {
1077 tty_unlock();
1078 return -EPERM;
1079 }
1080 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1081 (new_serial.flags & ASYNC_USR_MASK));
1082 state->custom_divisor = new_serial.custom_divisor;
1083 goto check_and_exit;
1084 }
1085
1086 if (new_serial.baud_base < 9600) {
1087 tty_unlock();
1088 return -EINVAL;
1089 }
1090
1091 /*
1092 * OK, past this point, all the error checking has been done.
1093 * At this point, we start making changes.....
1094 */
1095
1096 state->baud_base = new_serial.baud_base;
1097 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1098 (new_serial.flags & ASYNC_FLAGS));
1099 state->custom_divisor = new_serial.custom_divisor;
1100 port->close_delay = new_serial.close_delay * HZ/100;
1101 port->closing_wait = new_serial.closing_wait * HZ/100;
1102 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1103
1104check_and_exit:
1105 if (port->flags & ASYNC_INITIALIZED) {
1106 if (change_spd) {
1107 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1108 tty->alt_speed = 57600;
1109 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1110 tty->alt_speed = 115200;
1111 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1112 tty->alt_speed = 230400;
1113 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1114 tty->alt_speed = 460800;
1115 change_speed(tty, state, NULL);
1116 }
1117 } else
1118 retval = startup(tty, state);
1119 tty_unlock();
1120 return retval;
1121}
1122
1123
1124/*
1125 * get_lsr_info - get line status register info
1126 *
1127 * Purpose: Let user call ioctl() to get info when the UART physically
1128 * is emptied. On bus types like RS485, the transmitter must
1129 * release the bus after transmitting. This must be done when
1130 * the transmit shift register is empty, not be done when the
1131 * transmit holding register is empty. This functionality
1132 * allows an RS485 driver to be written in user space.
1133 */
1134static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1135{
1136 unsigned char status;
1137 unsigned int result;
1138 unsigned long flags;
1139
1140 local_irq_save(flags);
1141 status = custom.serdatr;
1142 mb();
1143 local_irq_restore(flags);
1144 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1145 if (copy_to_user(value, &result, sizeof(int)))
1146 return -EFAULT;
1147 return 0;
1148}
1149
1150
1151static int rs_tiocmget(struct tty_struct *tty)
1152{
1153 struct serial_state *info = tty->driver_data;
1154 unsigned char control, status;
1155 unsigned long flags;
1156
1157 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1158 return -ENODEV;
1159 if (tty->flags & (1 << TTY_IO_ERROR))
1160 return -EIO;
1161
1162 control = info->MCR;
1163 local_irq_save(flags);
1164 status = ciab.pra;
1165 local_irq_restore(flags);
1166 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1167 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1168 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1169 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1170 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1171}
1172
1173static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1174 unsigned int clear)
1175{
1176 struct serial_state *info = tty->driver_data;
1177 unsigned long flags;
1178
1179 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1180 return -ENODEV;
1181 if (tty->flags & (1 << TTY_IO_ERROR))
1182 return -EIO;
1183
1184 local_irq_save(flags);
1185 if (set & TIOCM_RTS)
1186 info->MCR |= SER_RTS;
1187 if (set & TIOCM_DTR)
1188 info->MCR |= SER_DTR;
1189 if (clear & TIOCM_RTS)
1190 info->MCR &= ~SER_RTS;
1191 if (clear & TIOCM_DTR)
1192 info->MCR &= ~SER_DTR;
1193 rtsdtr_ctrl(info->MCR);
1194 local_irq_restore(flags);
1195 return 0;
1196}
1197
1198/*
1199 * rs_break() --- routine which turns the break handling on or off
1200 */
1201static int rs_break(struct tty_struct *tty, int break_state)
1202{
1203 struct serial_state *info = tty->driver_data;
1204 unsigned long flags;
1205
1206 if (serial_paranoia_check(info, tty->name, "rs_break"))
1207 return -EINVAL;
1208
1209 local_irq_save(flags);
1210 if (break_state == -1)
1211 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1212 else
1213 custom.adkcon = AC_UARTBRK;
1214 mb();
1215 local_irq_restore(flags);
1216 return 0;
1217}
1218
1219/*
1220 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1221 * Return: write counters to the user passed counter struct
1222 * NB: both 1->0 and 0->1 transitions are counted except for
1223 * RI where only 0->1 is counted.
1224 */
1225static int rs_get_icount(struct tty_struct *tty,
1226 struct serial_icounter_struct *icount)
1227{
1228 struct serial_state *info = tty->driver_data;
1229 struct async_icount cnow;
1230 unsigned long flags;
1231
1232 local_irq_save(flags);
1233 cnow = info->icount;
1234 local_irq_restore(flags);
1235 icount->cts = cnow.cts;
1236 icount->dsr = cnow.dsr;
1237 icount->rng = cnow.rng;
1238 icount->dcd = cnow.dcd;
1239 icount->rx = cnow.rx;
1240 icount->tx = cnow.tx;
1241 icount->frame = cnow.frame;
1242 icount->overrun = cnow.overrun;
1243 icount->parity = cnow.parity;
1244 icount->brk = cnow.brk;
1245 icount->buf_overrun = cnow.buf_overrun;
1246
1247 return 0;
1248}
1249
1250static int rs_ioctl(struct tty_struct *tty,
1251 unsigned int cmd, unsigned long arg)
1252{
1253 struct serial_state *info = tty->driver_data;
1254 struct async_icount cprev, cnow; /* kernel counter temps */
1255 void __user *argp = (void __user *)arg;
1256 unsigned long flags;
1257
1258 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1259 return -ENODEV;
1260
1261 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1262 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1263 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1264 if (tty->flags & (1 << TTY_IO_ERROR))
1265 return -EIO;
1266 }
1267
1268 switch (cmd) {
1269 case TIOCGSERIAL:
1270 return get_serial_info(tty, info, argp);
1271 case TIOCSSERIAL:
1272 return set_serial_info(tty, info, argp);
1273 case TIOCSERCONFIG:
1274 return 0;
1275
1276 case TIOCSERGETLSR: /* Get line status register */
1277 return get_lsr_info(info, argp);
1278
1279 case TIOCSERGSTRUCT:
1280 if (copy_to_user(argp,
1281 info, sizeof(struct serial_state)))
1282 return -EFAULT;
1283 return 0;
1284
1285 /*
1286 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1287 * - mask passed in arg for lines of interest
1288 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1289 * Caller should use TIOCGICOUNT to see which one it was
1290 */
1291 case TIOCMIWAIT:
1292 local_irq_save(flags);
1293 /* note the counters on entry */
1294 cprev = info->icount;
1295 local_irq_restore(flags);
1296 while (1) {
1297 interruptible_sleep_on(&info->tport.delta_msr_wait);
1298 /* see if a signal did it */
1299 if (signal_pending(current))
1300 return -ERESTARTSYS;
1301 local_irq_save(flags);
1302 cnow = info->icount; /* atomic copy */
1303 local_irq_restore(flags);
1304 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1305 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1306 return -EIO; /* no change => error */
1307 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1308 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1309 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1310 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1311 return 0;
1312 }
1313 cprev = cnow;
1314 }
1315 /* NOTREACHED */
1316
1317 case TIOCSERGWILD:
1318 case TIOCSERSWILD:
1319 /* "setserial -W" is called in Debian boot */
1320 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1321 return 0;
1322
1323 default:
1324 return -ENOIOCTLCMD;
1325 }
1326 return 0;
1327}
1328
1329static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1330{
1331 struct serial_state *info = tty->driver_data;
1332 unsigned long flags;
1333 unsigned int cflag = tty->termios->c_cflag;
1334
1335 change_speed(tty, info, old_termios);
1336
1337 /* Handle transition to B0 status */
1338 if ((old_termios->c_cflag & CBAUD) &&
1339 !(cflag & CBAUD)) {
1340 info->MCR &= ~(SER_DTR|SER_RTS);
1341 local_irq_save(flags);
1342 rtsdtr_ctrl(info->MCR);
1343 local_irq_restore(flags);
1344 }
1345
1346 /* Handle transition away from B0 status */
1347 if (!(old_termios->c_cflag & CBAUD) &&
1348 (cflag & CBAUD)) {
1349 info->MCR |= SER_DTR;
1350 if (!(tty->termios->c_cflag & CRTSCTS) ||
1351 !test_bit(TTY_THROTTLED, &tty->flags)) {
1352 info->MCR |= SER_RTS;
1353 }
1354 local_irq_save(flags);
1355 rtsdtr_ctrl(info->MCR);
1356 local_irq_restore(flags);
1357 }
1358
1359 /* Handle turning off CRTSCTS */
1360 if ((old_termios->c_cflag & CRTSCTS) &&
1361 !(tty->termios->c_cflag & CRTSCTS)) {
1362 tty->hw_stopped = 0;
1363 rs_start(tty);
1364 }
1365
1366#if 0
1367 /*
1368 * No need to wake up processes in open wait, since they
1369 * sample the CLOCAL flag once, and don't recheck it.
1370 * XXX It's not clear whether the current behavior is correct
1371 * or not. Hence, this may change.....
1372 */
1373 if (!(old_termios->c_cflag & CLOCAL) &&
1374 (tty->termios->c_cflag & CLOCAL))
1375 wake_up_interruptible(&info->open_wait);
1376#endif
1377}
1378
1379/*
1380 * ------------------------------------------------------------
1381 * rs_close()
1382 *
1383 * This routine is called when the serial port gets closed. First, we
1384 * wait for the last remaining data to be sent. Then, we unlink its
1385 * async structure from the interrupt chain if necessary, and we free
1386 * that IRQ if nothing is left in the chain.
1387 * ------------------------------------------------------------
1388 */
1389static void rs_close(struct tty_struct *tty, struct file * filp)
1390{
1391 struct serial_state *state = tty->driver_data;
1392 struct tty_port *port = &state->tport;
1393
1394 if (serial_paranoia_check(state, tty->name, "rs_close"))
1395 return;
1396
1397 if (tty_port_close_start(port, tty, filp) == 0)
1398 return;
1399
1400 /*
1401 * At this point we stop accepting input. To do this, we
1402 * disable the receive line status interrupts, and tell the
1403 * interrupt driver to stop checking the data ready bit in the
1404 * line status register.
1405 */
1406 state->read_status_mask &= ~UART_LSR_DR;
1407 if (port->flags & ASYNC_INITIALIZED) {
1408 /* disable receive interrupts */
1409 custom.intena = IF_RBF;
1410 mb();
1411 /* clear any pending receive interrupt */
1412 custom.intreq = IF_RBF;
1413 mb();
1414
1415 /*
1416 * Before we drop DTR, make sure the UART transmitter
1417 * has completely drained; this is especially
1418 * important if there is a transmit FIFO!
1419 */
1420 rs_wait_until_sent(tty, state->timeout);
1421 }
1422 shutdown(tty, state);
1423 rs_flush_buffer(tty);
1424
1425 tty_ldisc_flush(tty);
1426 port->tty = NULL;
1427
1428 tty_port_close_end(port, tty);
1429}
1430
1431/*
1432 * rs_wait_until_sent() --- wait until the transmitter is empty
1433 */
1434static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1435{
1436 struct serial_state *info = tty->driver_data;
1437 unsigned long orig_jiffies, char_time;
1438 int lsr;
1439
1440 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1441 return;
1442
1443 if (info->xmit_fifo_size == 0)
1444 return; /* Just in case.... */
1445
1446 orig_jiffies = jiffies;
1447
1448 /*
1449 * Set the check interval to be 1/5 of the estimated time to
1450 * send a single character, and make it at least 1. The check
1451 * interval should also be less than the timeout.
1452 *
1453 * Note: we have to use pretty tight timings here to satisfy
1454 * the NIST-PCTS.
1455 */
1456 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1457 char_time = char_time / 5;
1458 if (char_time == 0)
1459 char_time = 1;
1460 if (timeout)
1461 char_time = min_t(unsigned long, char_time, timeout);
1462 /*
1463 * If the transmitter hasn't cleared in twice the approximate
1464 * amount of time to send the entire FIFO, it probably won't
1465 * ever clear. This assumes the UART isn't doing flow
1466 * control, which is currently the case. Hence, if it ever
1467 * takes longer than info->timeout, this is probably due to a
1468 * UART bug of some kind. So, we clamp the timeout parameter at
1469 * 2*info->timeout.
1470 */
1471 if (!timeout || timeout > 2*info->timeout)
1472 timeout = 2*info->timeout;
1473#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1474 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1475 printk("jiff=%lu...", jiffies);
1476#endif
1477 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1478#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1479 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1480#endif
1481 msleep_interruptible(jiffies_to_msecs(char_time));
1482 if (signal_pending(current))
1483 break;
1484 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1485 break;
1486 }
1487 __set_current_state(TASK_RUNNING);
1488
1489#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1490 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1491#endif
1492}
1493
1494/*
1495 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1496 */
1497static void rs_hangup(struct tty_struct *tty)
1498{
1499 struct serial_state *info = tty->driver_data;
1500
1501 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1502 return;
1503
1504 rs_flush_buffer(tty);
1505 shutdown(tty, info);
1506 info->tport.count = 0;
1507 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
1508 info->tport.tty = NULL;
1509 wake_up_interruptible(&info->tport.open_wait);
1510}
1511
1512/*
1513 * This routine is called whenever a serial port is opened. It
1514 * enables interrupts for a serial port, linking in its async structure into
1515 * the IRQ chain. It also performs the serial-specific
1516 * initialization for the tty structure.
1517 */
1518static int rs_open(struct tty_struct *tty, struct file * filp)
1519{
1520 struct serial_state *info = rs_table + tty->index;
1521 struct tty_port *port = &info->tport;
1522 int retval;
1523
1524 port->count++;
1525 port->tty = tty;
1526 tty->driver_data = info;
1527 tty->port = port;
1528 if (serial_paranoia_check(info, tty->name, "rs_open"))
1529 return -ENODEV;
1530
1531 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1532
1533 retval = startup(tty, info);
1534 if (retval) {
1535 return retval;
1536 }
1537
1538 return tty_port_block_til_ready(port, tty, filp);
1539}
1540
1541/*
1542 * /proc fs routines....
1543 */
1544
1545static inline void line_info(struct seq_file *m, int line,
1546 struct serial_state *state)
1547{
1548 char stat_buf[30], control, status;
1549 unsigned long flags;
1550
1551 seq_printf(m, "%d: uart:amiga_builtin", line);
1552
1553 local_irq_save(flags);
1554 status = ciab.pra;
1555 control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status;
1556 local_irq_restore(flags);
1557
1558 stat_buf[0] = 0;
1559 stat_buf[1] = 0;
1560 if(!(control & SER_RTS))
1561 strcat(stat_buf, "|RTS");
1562 if(!(status & SER_CTS))
1563 strcat(stat_buf, "|CTS");
1564 if(!(control & SER_DTR))
1565 strcat(stat_buf, "|DTR");
1566 if(!(status & SER_DSR))
1567 strcat(stat_buf, "|DSR");
1568 if(!(status & SER_DCD))
1569 strcat(stat_buf, "|CD");
1570
1571 if (state->quot)
1572 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1573
1574 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1575
1576 if (state->icount.frame)
1577 seq_printf(m, " fe:%d", state->icount.frame);
1578
1579 if (state->icount.parity)
1580 seq_printf(m, " pe:%d", state->icount.parity);
1581
1582 if (state->icount.brk)
1583 seq_printf(m, " brk:%d", state->icount.brk);
1584
1585 if (state->icount.overrun)
1586 seq_printf(m, " oe:%d", state->icount.overrun);
1587
1588 /*
1589 * Last thing is the RS-232 status lines
1590 */
1591 seq_printf(m, " %s\n", stat_buf+1);
1592}
1593
1594static int rs_proc_show(struct seq_file *m, void *v)
1595{
1596 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1597 line_info(m, 0, &rs_table[0]);
1598 return 0;
1599}
1600
1601static int rs_proc_open(struct inode *inode, struct file *file)
1602{
1603 return single_open(file, rs_proc_show, NULL);
1604}
1605
1606static const struct file_operations rs_proc_fops = {
1607 .owner = THIS_MODULE,
1608 .open = rs_proc_open,
1609 .read = seq_read,
1610 .llseek = seq_lseek,
1611 .release = single_release,
1612};
1613
1614/*
1615 * ---------------------------------------------------------------------
1616 * rs_init() and friends
1617 *
1618 * rs_init() is called at boot-time to initialize the serial driver.
1619 * ---------------------------------------------------------------------
1620 */
1621
1622/*
1623 * This routine prints out the appropriate serial driver version
1624 * number, and identifies which options were configured into this
1625 * driver.
1626 */
1627static void show_serial_version(void)
1628{
1629 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1630}
1631
1632
1633static const struct tty_operations serial_ops = {
1634 .open = rs_open,
1635 .close = rs_close,
1636 .write = rs_write,
1637 .put_char = rs_put_char,
1638 .flush_chars = rs_flush_chars,
1639 .write_room = rs_write_room,
1640 .chars_in_buffer = rs_chars_in_buffer,
1641 .flush_buffer = rs_flush_buffer,
1642 .ioctl = rs_ioctl,
1643 .throttle = rs_throttle,
1644 .unthrottle = rs_unthrottle,
1645 .set_termios = rs_set_termios,
1646 .stop = rs_stop,
1647 .start = rs_start,
1648 .hangup = rs_hangup,
1649 .break_ctl = rs_break,
1650 .send_xchar = rs_send_xchar,
1651 .wait_until_sent = rs_wait_until_sent,
1652 .tiocmget = rs_tiocmget,
1653 .tiocmset = rs_tiocmset,
1654 .get_icount = rs_get_icount,
1655 .proc_fops = &rs_proc_fops,
1656};
1657
1658static int amiga_carrier_raised(struct tty_port *port)
1659{
1660 return !(ciab.pra & SER_DCD);
1661}
1662
1663static void amiga_dtr_rts(struct tty_port *port, int raise)
1664{
1665 struct serial_state *info = container_of(port, struct serial_state,
1666 tport);
1667 unsigned long flags;
1668
1669 if (raise)
1670 info->MCR |= SER_DTR|SER_RTS;
1671 else
1672 info->MCR &= ~(SER_DTR|SER_RTS);
1673
1674 local_irq_save(flags);
1675 rtsdtr_ctrl(info->MCR);
1676 local_irq_restore(flags);
1677}
1678
1679static const struct tty_port_operations amiga_port_ops = {
1680 .carrier_raised = amiga_carrier_raised,
1681 .dtr_rts = amiga_dtr_rts,
1682};
1683
1684/*
1685 * The serial driver boot-time initialization code!
1686 */
1687static int __init amiga_serial_probe(struct platform_device *pdev)
1688{
1689 unsigned long flags;
1690 struct serial_state * state;
1691 int error;
1692
1693 serial_driver = alloc_tty_driver(NR_PORTS);
1694 if (!serial_driver)
1695 return -ENOMEM;
1696
1697 show_serial_version();
1698
1699 /* Initialize the tty_driver structure */
1700
1701 serial_driver->driver_name = "amiserial";
1702 serial_driver->name = "ttyS";
1703 serial_driver->major = TTY_MAJOR;
1704 serial_driver->minor_start = 64;
1705 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1706 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1707 serial_driver->init_termios = tty_std_termios;
1708 serial_driver->init_termios.c_cflag =
1709 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1710 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1711 tty_set_operations(serial_driver, &serial_ops);
1712
1713 error = tty_register_driver(serial_driver);
1714 if (error)
1715 goto fail_put_tty_driver;
1716
1717 state = rs_table;
1718 state->port = (int)&custom.serdatr; /* Just to give it a value */
1719 state->custom_divisor = 0;
1720 state->icount.cts = state->icount.dsr =
1721 state->icount.rng = state->icount.dcd = 0;
1722 state->icount.rx = state->icount.tx = 0;
1723 state->icount.frame = state->icount.parity = 0;
1724 state->icount.overrun = state->icount.brk = 0;
1725 tty_port_init(&state->tport);
1726 state->tport.ops = &amiga_port_ops;
1727
1728 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1729
1730 /* Hardware set up */
1731
1732 state->baud_base = amiga_colorclock;
1733 state->xmit_fifo_size = 1;
1734
1735 /* set ISRs, and then disable the rx interrupts */
1736 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1737 if (error)
1738 goto fail_unregister;
1739
1740 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1741 "serial RX", state);
1742 if (error)
1743 goto fail_free_irq;
1744
1745 local_irq_save(flags);
1746
1747 /* turn off Rx and Tx interrupts */
1748 custom.intena = IF_RBF | IF_TBE;
1749 mb();
1750
1751 /* clear any pending interrupt */
1752 custom.intreq = IF_RBF | IF_TBE;
1753 mb();
1754
1755 local_irq_restore(flags);
1756
1757 /*
1758 * set the appropriate directions for the modem control flags,
1759 * and clear RTS and DTR
1760 */
1761 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1762 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1763
1764 platform_set_drvdata(pdev, state);
1765
1766 return 0;
1767
1768fail_free_irq:
1769 free_irq(IRQ_AMIGA_TBE, state);
1770fail_unregister:
1771 tty_unregister_driver(serial_driver);
1772fail_put_tty_driver:
1773 put_tty_driver(serial_driver);
1774 return error;
1775}
1776
1777static int __exit amiga_serial_remove(struct platform_device *pdev)
1778{
1779 int error;
1780 struct serial_state *state = platform_get_drvdata(pdev);
1781
1782 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1783 if ((error = tty_unregister_driver(serial_driver)))
1784 printk("SERIAL: failed to unregister serial driver (%d)\n",
1785 error);
1786 put_tty_driver(serial_driver);
1787
1788 free_irq(IRQ_AMIGA_TBE, state);
1789 free_irq(IRQ_AMIGA_RBF, state);
1790
1791 platform_set_drvdata(pdev, NULL);
1792
1793 return error;
1794}
1795
1796static struct platform_driver amiga_serial_driver = {
1797 .remove = __exit_p(amiga_serial_remove),
1798 .driver = {
1799 .name = "amiga-serial",
1800 .owner = THIS_MODULE,
1801 },
1802};
1803
1804static int __init amiga_serial_init(void)
1805{
1806 return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
1807}
1808
1809module_init(amiga_serial_init);
1810
1811static void __exit amiga_serial_exit(void)
1812{
1813 platform_driver_unregister(&amiga_serial_driver);
1814}
1815
1816module_exit(amiga_serial_exit);
1817
1818
1819#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1820
1821/*
1822 * ------------------------------------------------------------
1823 * Serial console driver
1824 * ------------------------------------------------------------
1825 */
1826
1827static void amiga_serial_putc(char c)
1828{
1829 custom.serdat = (unsigned char)c | 0x100;
1830 while (!(custom.serdatr & 0x2000))
1831 barrier();
1832}
1833
1834/*
1835 * Print a string to the serial port trying not to disturb
1836 * any possible real use of the port...
1837 *
1838 * The console must be locked when we get here.
1839 */
1840static void serial_console_write(struct console *co, const char *s,
1841 unsigned count)
1842{
1843 unsigned short intena = custom.intenar;
1844
1845 custom.intena = IF_TBE;
1846
1847 while (count--) {
1848 if (*s == '\n')
1849 amiga_serial_putc('\r');
1850 amiga_serial_putc(*s++);
1851 }
1852
1853 custom.intena = IF_SETCLR | (intena & IF_TBE);
1854}
1855
1856static struct tty_driver *serial_console_device(struct console *c, int *index)
1857{
1858 *index = 0;
1859 return serial_driver;
1860}
1861
1862static struct console sercons = {
1863 .name = "ttyS",
1864 .write = serial_console_write,
1865 .device = serial_console_device,
1866 .flags = CON_PRINTBUFFER,
1867 .index = -1,
1868};
1869
1870/*
1871 * Register console.
1872 */
1873static int __init amiserial_console_init(void)
1874{
1875 register_console(&sercons);
1876 return 0;
1877}
1878console_initcall(amiserial_console_init);
1879
1880#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1881
1882MODULE_LICENSE("GPL");
1883MODULE_ALIAS("platform:amiga-serial");