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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Serial driver for the amiga builtin port.
4 *
5 * This code was created by taking serial.c version 4.30 from kernel
6 * release 2.3.22, replacing all hardware related stuff with the
7 * corresponding amiga hardware actions, and removing all irrelevant
8 * code. As a consequence, it uses many of the constants and names
9 * associated with the registers and bits of 16550 compatible UARTS -
10 * but only to keep track of status, etc in the state variables. It
11 * was done this was to make it easier to keep the code in line with
12 * (non hardware specific) changes to serial.c.
13 *
14 * The port is registered with the tty driver as minor device 64, and
15 * therefore other ports should should only use 65 upwards.
16 *
17 * Richard Lucock 28/12/99
18 *
19 * Copyright (C) 1991, 1992 Linus Torvalds
20 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
21 * 1998, 1999 Theodore Ts'o
22 *
23 */
24
25/*
26 * Serial driver configuration section. Here are the various options:
27 *
28 * SERIAL_PARANOIA_CHECK
29 * Check the magic number for the async_structure where
30 * ever possible.
31 */
32
33#include <linux/delay.h>
34
35#undef SERIAL_PARANOIA_CHECK
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 <linux/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 unsigned char ch, flag;
255 struct async_icount *icount;
256 int oe = 0;
257
258 icount = &info->icount;
259
260 status = UART_LSR_DR; /* We obviously have a character! */
261 serdatr = custom.serdatr;
262 mb();
263 custom.intreq = IF_RBF;
264 mb();
265
266 if((serdatr & 0x1ff) == 0)
267 status |= UART_LSR_BI;
268 if(serdatr & SDR_OVRUN)
269 status |= UART_LSR_OE;
270
271 ch = serdatr & 0xff;
272 icount->rx++;
273
274#ifdef SERIAL_DEBUG_INTR
275 printk("DR%02x:%02x...", ch, status);
276#endif
277 flag = TTY_NORMAL;
278
279 /*
280 * We don't handle parity or frame errors - but I have left
281 * the code in, since I'm not sure that the errors can't be
282 * detected.
283 */
284
285 if (status & (UART_LSR_BI | UART_LSR_PE |
286 UART_LSR_FE | UART_LSR_OE)) {
287 /*
288 * For statistics only
289 */
290 if (status & UART_LSR_BI) {
291 status &= ~(UART_LSR_FE | UART_LSR_PE);
292 icount->brk++;
293 } else if (status & UART_LSR_PE)
294 icount->parity++;
295 else if (status & UART_LSR_FE)
296 icount->frame++;
297 if (status & UART_LSR_OE)
298 icount->overrun++;
299
300 /*
301 * Now check to see if character should be
302 * ignored, and mask off conditions which
303 * should be ignored.
304 */
305 if (status & info->ignore_status_mask)
306 goto out;
307
308 status &= info->read_status_mask;
309
310 if (status & (UART_LSR_BI)) {
311#ifdef SERIAL_DEBUG_INTR
312 printk("handling break....");
313#endif
314 flag = TTY_BREAK;
315 if (info->tport.flags & ASYNC_SAK)
316 do_SAK(info->tport.tty);
317 } else if (status & UART_LSR_PE)
318 flag = TTY_PARITY;
319 else if (status & UART_LSR_FE)
320 flag = TTY_FRAME;
321 if (status & UART_LSR_OE) {
322 /*
323 * Overrun is special, since it's
324 * reported immediately, and doesn't
325 * affect the current character
326 */
327 oe = 1;
328 }
329 }
330 tty_insert_flip_char(&info->tport, ch, flag);
331 if (oe == 1)
332 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
333 tty_flip_buffer_push(&info->tport);
334out:
335 return;
336}
337
338static void transmit_chars(struct serial_state *info)
339{
340 custom.intreq = IF_TBE;
341 mb();
342 if (info->x_char) {
343 custom.serdat = info->x_char | 0x100;
344 mb();
345 info->icount.tx++;
346 info->x_char = 0;
347 return;
348 }
349 if (info->xmit.head == info->xmit.tail
350 || info->tport.tty->stopped
351 || info->tport.tty->hw_stopped) {
352 info->IER &= ~UART_IER_THRI;
353 custom.intena = IF_TBE;
354 mb();
355 return;
356 }
357
358 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
359 mb();
360 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
361 info->icount.tx++;
362
363 if (CIRC_CNT(info->xmit.head,
364 info->xmit.tail,
365 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
366 tty_wakeup(info->tport.tty);
367
368#ifdef SERIAL_DEBUG_INTR
369 printk("THRE...");
370#endif
371 if (info->xmit.head == info->xmit.tail) {
372 custom.intena = IF_TBE;
373 mb();
374 info->IER &= ~UART_IER_THRI;
375 }
376}
377
378static void check_modem_status(struct serial_state *info)
379{
380 struct tty_port *port = &info->tport;
381 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
382 unsigned char dstatus;
383 struct async_icount *icount;
384
385 /* Determine bits that have changed */
386 dstatus = status ^ current_ctl_bits;
387 current_ctl_bits = status;
388
389 if (dstatus) {
390 icount = &info->icount;
391 /* update input line counters */
392 if (dstatus & SER_DSR)
393 icount->dsr++;
394 if (dstatus & SER_DCD) {
395 icount->dcd++;
396 }
397 if (dstatus & SER_CTS)
398 icount->cts++;
399 wake_up_interruptible(&port->delta_msr_wait);
400 }
401
402 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
403#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
404 printk("ttyS%d CD now %s...", info->line,
405 (!(status & SER_DCD)) ? "on" : "off");
406#endif
407 if (!(status & SER_DCD))
408 wake_up_interruptible(&port->open_wait);
409 else {
410#ifdef SERIAL_DEBUG_OPEN
411 printk("doing serial hangup...");
412#endif
413 if (port->tty)
414 tty_hangup(port->tty);
415 }
416 }
417 if (tty_port_cts_enabled(port)) {
418 if (port->tty->hw_stopped) {
419 if (!(status & SER_CTS)) {
420#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
421 printk("CTS tx start...");
422#endif
423 port->tty->hw_stopped = 0;
424 info->IER |= UART_IER_THRI;
425 custom.intena = IF_SETCLR | IF_TBE;
426 mb();
427 /* set a pending Tx Interrupt, transmitter should restart now */
428 custom.intreq = IF_SETCLR | IF_TBE;
429 mb();
430 tty_wakeup(port->tty);
431 return;
432 }
433 } else {
434 if ((status & SER_CTS)) {
435#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
436 printk("CTS tx stop...");
437#endif
438 port->tty->hw_stopped = 1;
439 info->IER &= ~UART_IER_THRI;
440 /* disable Tx interrupt and remove any pending interrupts */
441 custom.intena = IF_TBE;
442 mb();
443 custom.intreq = IF_TBE;
444 mb();
445 }
446 }
447 }
448}
449
450static irqreturn_t ser_vbl_int( int irq, void *data)
451{
452 /* vbl is just a periodic interrupt we tie into to update modem status */
453 struct serial_state *info = data;
454 /*
455 * TBD - is it better to unregister from this interrupt or to
456 * ignore it if MSI is clear ?
457 */
458 if(info->IER & UART_IER_MSI)
459 check_modem_status(info);
460 return IRQ_HANDLED;
461}
462
463static irqreturn_t ser_rx_int(int irq, void *dev_id)
464{
465 struct serial_state *info = dev_id;
466
467#ifdef SERIAL_DEBUG_INTR
468 printk("ser_rx_int...");
469#endif
470
471 if (!info->tport.tty)
472 return IRQ_NONE;
473
474 receive_chars(info);
475#ifdef SERIAL_DEBUG_INTR
476 printk("end.\n");
477#endif
478 return IRQ_HANDLED;
479}
480
481static irqreturn_t ser_tx_int(int irq, void *dev_id)
482{
483 struct serial_state *info = dev_id;
484
485 if (custom.serdatr & SDR_TBE) {
486#ifdef SERIAL_DEBUG_INTR
487 printk("ser_tx_int...");
488#endif
489
490 if (!info->tport.tty)
491 return IRQ_NONE;
492
493 transmit_chars(info);
494#ifdef SERIAL_DEBUG_INTR
495 printk("end.\n");
496#endif
497 }
498 return IRQ_HANDLED;
499}
500
501/*
502 * -------------------------------------------------------------------
503 * Here ends the serial interrupt routines.
504 * -------------------------------------------------------------------
505 */
506
507/*
508 * ---------------------------------------------------------------
509 * Low level utility subroutines for the serial driver: routines to
510 * figure out the appropriate timeout for an interrupt chain, routines
511 * to initialize and startup a serial port, and routines to shutdown a
512 * serial port. Useful stuff like that.
513 * ---------------------------------------------------------------
514 */
515
516static int startup(struct tty_struct *tty, struct serial_state *info)
517{
518 struct tty_port *port = &info->tport;
519 unsigned long flags;
520 int retval=0;
521 unsigned long page;
522
523 page = get_zeroed_page(GFP_KERNEL);
524 if (!page)
525 return -ENOMEM;
526
527 local_irq_save(flags);
528
529 if (tty_port_initialized(port)) {
530 free_page(page);
531 goto errout;
532 }
533
534 if (info->xmit.buf)
535 free_page(page);
536 else
537 info->xmit.buf = (unsigned char *) page;
538
539#ifdef SERIAL_DEBUG_OPEN
540 printk("starting up ttys%d ...", info->line);
541#endif
542
543 /* Clear anything in the input buffer */
544
545 custom.intreq = IF_RBF;
546 mb();
547
548 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
549 if (retval) {
550 if (serial_isroot()) {
551 set_bit(TTY_IO_ERROR, &tty->flags);
552 retval = 0;
553 }
554 goto errout;
555 }
556
557 /* enable both Rx and Tx interrupts */
558 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
559 mb();
560 info->IER = UART_IER_MSI;
561
562 /* remember current state of the DCD and CTS bits */
563 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
564
565 info->MCR = 0;
566 if (C_BAUD(tty))
567 info->MCR = SER_DTR | SER_RTS;
568 rtsdtr_ctrl(info->MCR);
569
570 clear_bit(TTY_IO_ERROR, &tty->flags);
571 info->xmit.head = info->xmit.tail = 0;
572
573 /*
574 * and set the speed of the serial port
575 */
576 change_speed(tty, info, NULL);
577
578 tty_port_set_initialized(port, 1);
579 local_irq_restore(flags);
580 return 0;
581
582errout:
583 local_irq_restore(flags);
584 return retval;
585}
586
587/*
588 * This routine will shutdown a serial port; interrupts are disabled, and
589 * DTR is dropped if the hangup on close termio flag is on.
590 */
591static void shutdown(struct tty_struct *tty, struct serial_state *info)
592{
593 unsigned long flags;
594 struct serial_state *state;
595
596 if (!tty_port_initialized(&info->tport))
597 return;
598
599 state = info;
600
601#ifdef SERIAL_DEBUG_OPEN
602 printk("Shutting down serial port %d ....\n", info->line);
603#endif
604
605 local_irq_save(flags); /* Disable interrupts */
606
607 /*
608 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
609 * here so the queue might never be waken up
610 */
611 wake_up_interruptible(&info->tport.delta_msr_wait);
612
613 /*
614 * Free the IRQ, if necessary
615 */
616 free_irq(IRQ_AMIGA_VERTB, info);
617
618 if (info->xmit.buf) {
619 free_page((unsigned long) info->xmit.buf);
620 info->xmit.buf = NULL;
621 }
622
623 info->IER = 0;
624 custom.intena = IF_RBF | IF_TBE;
625 mb();
626
627 /* disable break condition */
628 custom.adkcon = AC_UARTBRK;
629 mb();
630
631 if (C_HUPCL(tty))
632 info->MCR &= ~(SER_DTR|SER_RTS);
633 rtsdtr_ctrl(info->MCR);
634
635 set_bit(TTY_IO_ERROR, &tty->flags);
636
637 tty_port_set_initialized(&info->tport, 0);
638 local_irq_restore(flags);
639}
640
641
642/*
643 * This routine is called to set the UART divisor registers to match
644 * the specified baud rate for a serial port.
645 */
646static void change_speed(struct tty_struct *tty, struct serial_state *info,
647 struct ktermios *old_termios)
648{
649 struct tty_port *port = &info->tport;
650 int quot = 0, baud_base, baud;
651 unsigned cflag, cval = 0;
652 int bits;
653 unsigned long flags;
654
655 cflag = tty->termios.c_cflag;
656
657 /* Byte size is always 8 bits plus parity bit if requested */
658
659 cval = 3; bits = 10;
660 if (cflag & CSTOPB) {
661 cval |= 0x04;
662 bits++;
663 }
664 if (cflag & PARENB) {
665 cval |= UART_LCR_PARITY;
666 bits++;
667 }
668 if (!(cflag & PARODD))
669 cval |= UART_LCR_EPAR;
670#ifdef CMSPAR
671 if (cflag & CMSPAR)
672 cval |= UART_LCR_SPAR;
673#endif
674
675 /* Determine divisor based on baud rate */
676 baud = tty_get_baud_rate(tty);
677 if (!baud)
678 baud = 9600; /* B0 transition handled in rs_set_termios */
679 baud_base = info->baud_base;
680 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
681 quot = info->custom_divisor;
682 else {
683 if (baud == 134)
684 /* Special case since 134 is really 134.5 */
685 quot = (2*baud_base / 269);
686 else if (baud)
687 quot = baud_base / baud;
688 }
689 /* If the quotient is zero refuse the change */
690 if (!quot && old_termios) {
691 /* FIXME: Will need updating for new tty in the end */
692 tty->termios.c_cflag &= ~CBAUD;
693 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
694 baud = tty_get_baud_rate(tty);
695 if (!baud)
696 baud = 9600;
697 if (baud == 38400 &&
698 (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 }
708 /* As a last resort, if the quotient is zero, default to 9600 bps */
709 if (!quot)
710 quot = baud_base / 9600;
711 info->quot = quot;
712 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
713 info->timeout += HZ/50; /* Add .02 seconds of slop */
714
715 /* CTS flow control flag and modem status interrupts */
716 info->IER &= ~UART_IER_MSI;
717 if (port->flags & ASYNC_HARDPPS_CD)
718 info->IER |= UART_IER_MSI;
719 tty_port_set_cts_flow(port, cflag & CRTSCTS);
720 if (cflag & CRTSCTS)
721 info->IER |= UART_IER_MSI;
722 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
723 if (~cflag & CLOCAL)
724 info->IER |= UART_IER_MSI;
725 /* TBD:
726 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
727 */
728
729 /*
730 * Set up parity check flag
731 */
732
733 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
734 if (I_INPCK(tty))
735 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
736 if (I_BRKINT(tty) || I_PARMRK(tty))
737 info->read_status_mask |= UART_LSR_BI;
738
739 /*
740 * Characters to ignore
741 */
742 info->ignore_status_mask = 0;
743 if (I_IGNPAR(tty))
744 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
745 if (I_IGNBRK(tty)) {
746 info->ignore_status_mask |= UART_LSR_BI;
747 /*
748 * If we're ignore parity and break indicators, ignore
749 * overruns too. (For real raw support).
750 */
751 if (I_IGNPAR(tty))
752 info->ignore_status_mask |= UART_LSR_OE;
753 }
754 /*
755 * !!! ignore all characters if CREAD is not set
756 */
757 if ((cflag & CREAD) == 0)
758 info->ignore_status_mask |= UART_LSR_DR;
759 local_irq_save(flags);
760
761 {
762 short serper;
763
764 /* Set up the baud rate */
765 serper = quot - 1;
766
767 /* Enable or disable parity bit */
768
769 if(cval & UART_LCR_PARITY)
770 serper |= (SERPER_PARENB);
771
772 custom.serper = serper;
773 mb();
774 }
775
776 local_irq_restore(flags);
777}
778
779static int rs_put_char(struct tty_struct *tty, unsigned char ch)
780{
781 struct serial_state *info;
782 unsigned long flags;
783
784 info = tty->driver_data;
785
786 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
787 return 0;
788
789 if (!info->xmit.buf)
790 return 0;
791
792 local_irq_save(flags);
793 if (CIRC_SPACE(info->xmit.head,
794 info->xmit.tail,
795 SERIAL_XMIT_SIZE) == 0) {
796 local_irq_restore(flags);
797 return 0;
798 }
799
800 info->xmit.buf[info->xmit.head++] = ch;
801 info->xmit.head &= SERIAL_XMIT_SIZE-1;
802 local_irq_restore(flags);
803 return 1;
804}
805
806static void rs_flush_chars(struct tty_struct *tty)
807{
808 struct serial_state *info = tty->driver_data;
809 unsigned long flags;
810
811 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
812 return;
813
814 if (info->xmit.head == info->xmit.tail
815 || tty->stopped
816 || tty->hw_stopped
817 || !info->xmit.buf)
818 return;
819
820 local_irq_save(flags);
821 info->IER |= UART_IER_THRI;
822 custom.intena = IF_SETCLR | IF_TBE;
823 mb();
824 /* set a pending Tx Interrupt, transmitter should restart now */
825 custom.intreq = IF_SETCLR | IF_TBE;
826 mb();
827 local_irq_restore(flags);
828}
829
830static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
831{
832 int c, ret = 0;
833 struct serial_state *info = tty->driver_data;
834 unsigned long flags;
835
836 if (serial_paranoia_check(info, tty->name, "rs_write"))
837 return 0;
838
839 if (!info->xmit.buf)
840 return 0;
841
842 local_irq_save(flags);
843 while (1) {
844 c = CIRC_SPACE_TO_END(info->xmit.head,
845 info->xmit.tail,
846 SERIAL_XMIT_SIZE);
847 if (count < c)
848 c = count;
849 if (c <= 0) {
850 break;
851 }
852 memcpy(info->xmit.buf + info->xmit.head, buf, c);
853 info->xmit.head = ((info->xmit.head + c) &
854 (SERIAL_XMIT_SIZE-1));
855 buf += c;
856 count -= c;
857 ret += c;
858 }
859 local_irq_restore(flags);
860
861 if (info->xmit.head != info->xmit.tail
862 && !tty->stopped
863 && !tty->hw_stopped
864 && !(info->IER & UART_IER_THRI)) {
865 info->IER |= UART_IER_THRI;
866 local_irq_disable();
867 custom.intena = IF_SETCLR | IF_TBE;
868 mb();
869 /* set a pending Tx Interrupt, transmitter should restart now */
870 custom.intreq = IF_SETCLR | IF_TBE;
871 mb();
872 local_irq_restore(flags);
873 }
874 return ret;
875}
876
877static int rs_write_room(struct tty_struct *tty)
878{
879 struct serial_state *info = tty->driver_data;
880
881 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
882 return 0;
883 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
884}
885
886static int rs_chars_in_buffer(struct tty_struct *tty)
887{
888 struct serial_state *info = tty->driver_data;
889
890 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
891 return 0;
892 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
893}
894
895static void rs_flush_buffer(struct tty_struct *tty)
896{
897 struct serial_state *info = tty->driver_data;
898 unsigned long flags;
899
900 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
901 return;
902 local_irq_save(flags);
903 info->xmit.head = info->xmit.tail = 0;
904 local_irq_restore(flags);
905 tty_wakeup(tty);
906}
907
908/*
909 * This function is used to send a high-priority XON/XOFF character to
910 * the device
911 */
912static void rs_send_xchar(struct tty_struct *tty, char ch)
913{
914 struct serial_state *info = tty->driver_data;
915 unsigned long flags;
916
917 if (serial_paranoia_check(info, tty->name, "rs_send_xchar"))
918 return;
919
920 info->x_char = ch;
921 if (ch) {
922 /* Make sure transmit interrupts are on */
923
924 /* Check this ! */
925 local_irq_save(flags);
926 if(!(custom.intenar & IF_TBE)) {
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 }
933 local_irq_restore(flags);
934
935 info->IER |= UART_IER_THRI;
936 }
937}
938
939/*
940 * ------------------------------------------------------------
941 * rs_throttle()
942 *
943 * This routine is called by the upper-layer tty layer to signal that
944 * incoming characters should be throttled.
945 * ------------------------------------------------------------
946 */
947static void rs_throttle(struct tty_struct * tty)
948{
949 struct serial_state *info = tty->driver_data;
950 unsigned long flags;
951#ifdef SERIAL_DEBUG_THROTTLE
952 printk("throttle %s ....\n", tty_name(tty));
953#endif
954
955 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
956 return;
957
958 if (I_IXOFF(tty))
959 rs_send_xchar(tty, STOP_CHAR(tty));
960
961 if (C_CRTSCTS(tty))
962 info->MCR &= ~SER_RTS;
963
964 local_irq_save(flags);
965 rtsdtr_ctrl(info->MCR);
966 local_irq_restore(flags);
967}
968
969static void rs_unthrottle(struct tty_struct * tty)
970{
971 struct serial_state *info = tty->driver_data;
972 unsigned long flags;
973#ifdef SERIAL_DEBUG_THROTTLE
974 printk("unthrottle %s ....\n", tty_name(tty));
975#endif
976
977 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
978 return;
979
980 if (I_IXOFF(tty)) {
981 if (info->x_char)
982 info->x_char = 0;
983 else
984 rs_send_xchar(tty, START_CHAR(tty));
985 }
986 if (C_CRTSCTS(tty))
987 info->MCR |= SER_RTS;
988 local_irq_save(flags);
989 rtsdtr_ctrl(info->MCR);
990 local_irq_restore(flags);
991}
992
993/*
994 * ------------------------------------------------------------
995 * rs_ioctl() and friends
996 * ------------------------------------------------------------
997 */
998
999static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
1000{
1001 struct serial_state *state = tty->driver_data;
1002
1003 tty_lock(tty);
1004 ss->line = tty->index;
1005 ss->port = state->port;
1006 ss->flags = state->tport.flags;
1007 ss->xmit_fifo_size = state->xmit_fifo_size;
1008 ss->baud_base = state->baud_base;
1009 ss->close_delay = state->tport.close_delay;
1010 ss->closing_wait = state->tport.closing_wait;
1011 ss->custom_divisor = state->custom_divisor;
1012 tty_unlock(tty);
1013 return 0;
1014}
1015
1016static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
1017{
1018 struct serial_state *state = tty->driver_data;
1019 struct tty_port *port = &state->tport;
1020 bool change_spd;
1021 int retval = 0;
1022
1023 tty_lock(tty);
1024 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
1025 ss->custom_divisor != state->custom_divisor;
1026 if (ss->irq || ss->port != state->port ||
1027 ss->xmit_fifo_size != state->xmit_fifo_size) {
1028 tty_unlock(tty);
1029 return -EINVAL;
1030 }
1031
1032 if (!serial_isroot()) {
1033 if ((ss->baud_base != state->baud_base) ||
1034 (ss->close_delay != port->close_delay) ||
1035 (ss->xmit_fifo_size != state->xmit_fifo_size) ||
1036 ((ss->flags & ~ASYNC_USR_MASK) !=
1037 (port->flags & ~ASYNC_USR_MASK))) {
1038 tty_unlock(tty);
1039 return -EPERM;
1040 }
1041 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1042 (ss->flags & ASYNC_USR_MASK));
1043 state->custom_divisor = ss->custom_divisor;
1044 goto check_and_exit;
1045 }
1046
1047 if (ss->baud_base < 9600) {
1048 tty_unlock(tty);
1049 return -EINVAL;
1050 }
1051
1052 /*
1053 * OK, past this point, all the error checking has been done.
1054 * At this point, we start making changes.....
1055 */
1056
1057 state->baud_base = ss->baud_base;
1058 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1059 (ss->flags & ASYNC_FLAGS));
1060 state->custom_divisor = ss->custom_divisor;
1061 port->close_delay = ss->close_delay * HZ/100;
1062 port->closing_wait = ss->closing_wait * HZ/100;
1063 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1064
1065check_and_exit:
1066 if (tty_port_initialized(port)) {
1067 if (change_spd) {
1068 /* warn about deprecation unless clearing */
1069 if (ss->flags & ASYNC_SPD_MASK)
1070 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
1071 change_speed(tty, state, NULL);
1072 }
1073 } else
1074 retval = startup(tty, state);
1075 tty_unlock(tty);
1076 return retval;
1077}
1078
1079/*
1080 * get_lsr_info - get line status register info
1081 *
1082 * Purpose: Let user call ioctl() to get info when the UART physically
1083 * is emptied. On bus types like RS485, the transmitter must
1084 * release the bus after transmitting. This must be done when
1085 * the transmit shift register is empty, not be done when the
1086 * transmit holding register is empty. This functionality
1087 * allows an RS485 driver to be written in user space.
1088 */
1089static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1090{
1091 unsigned char status;
1092 unsigned int result;
1093 unsigned long flags;
1094
1095 local_irq_save(flags);
1096 status = custom.serdatr;
1097 mb();
1098 local_irq_restore(flags);
1099 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1100 if (copy_to_user(value, &result, sizeof(int)))
1101 return -EFAULT;
1102 return 0;
1103}
1104
1105
1106static int rs_tiocmget(struct tty_struct *tty)
1107{
1108 struct serial_state *info = tty->driver_data;
1109 unsigned char control, status;
1110 unsigned long flags;
1111
1112 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1113 return -ENODEV;
1114 if (tty_io_error(tty))
1115 return -EIO;
1116
1117 control = info->MCR;
1118 local_irq_save(flags);
1119 status = ciab.pra;
1120 local_irq_restore(flags);
1121 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1122 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1123 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1124 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1125 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1126}
1127
1128static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1129 unsigned int clear)
1130{
1131 struct serial_state *info = tty->driver_data;
1132 unsigned long flags;
1133
1134 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1135 return -ENODEV;
1136 if (tty_io_error(tty))
1137 return -EIO;
1138
1139 local_irq_save(flags);
1140 if (set & TIOCM_RTS)
1141 info->MCR |= SER_RTS;
1142 if (set & TIOCM_DTR)
1143 info->MCR |= SER_DTR;
1144 if (clear & TIOCM_RTS)
1145 info->MCR &= ~SER_RTS;
1146 if (clear & TIOCM_DTR)
1147 info->MCR &= ~SER_DTR;
1148 rtsdtr_ctrl(info->MCR);
1149 local_irq_restore(flags);
1150 return 0;
1151}
1152
1153/*
1154 * rs_break() --- routine which turns the break handling on or off
1155 */
1156static int rs_break(struct tty_struct *tty, int break_state)
1157{
1158 struct serial_state *info = tty->driver_data;
1159 unsigned long flags;
1160
1161 if (serial_paranoia_check(info, tty->name, "rs_break"))
1162 return -EINVAL;
1163
1164 local_irq_save(flags);
1165 if (break_state == -1)
1166 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1167 else
1168 custom.adkcon = AC_UARTBRK;
1169 mb();
1170 local_irq_restore(flags);
1171 return 0;
1172}
1173
1174/*
1175 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1176 * Return: write counters to the user passed counter struct
1177 * NB: both 1->0 and 0->1 transitions are counted except for
1178 * RI where only 0->1 is counted.
1179 */
1180static int rs_get_icount(struct tty_struct *tty,
1181 struct serial_icounter_struct *icount)
1182{
1183 struct serial_state *info = tty->driver_data;
1184 struct async_icount cnow;
1185 unsigned long flags;
1186
1187 local_irq_save(flags);
1188 cnow = info->icount;
1189 local_irq_restore(flags);
1190 icount->cts = cnow.cts;
1191 icount->dsr = cnow.dsr;
1192 icount->rng = cnow.rng;
1193 icount->dcd = cnow.dcd;
1194 icount->rx = cnow.rx;
1195 icount->tx = cnow.tx;
1196 icount->frame = cnow.frame;
1197 icount->overrun = cnow.overrun;
1198 icount->parity = cnow.parity;
1199 icount->brk = cnow.brk;
1200 icount->buf_overrun = cnow.buf_overrun;
1201
1202 return 0;
1203}
1204
1205static int rs_ioctl(struct tty_struct *tty,
1206 unsigned int cmd, unsigned long arg)
1207{
1208 struct serial_state *info = tty->driver_data;
1209 struct async_icount cprev, cnow; /* kernel counter temps */
1210 void __user *argp = (void __user *)arg;
1211 unsigned long flags;
1212 DEFINE_WAIT(wait);
1213 int ret;
1214
1215 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1216 return -ENODEV;
1217
1218 if ((cmd != TIOCSERCONFIG) &&
1219 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1220 if (tty_io_error(tty))
1221 return -EIO;
1222 }
1223
1224 switch (cmd) {
1225 case TIOCSERCONFIG:
1226 return 0;
1227
1228 case TIOCSERGETLSR: /* Get line status register */
1229 return get_lsr_info(info, argp);
1230
1231 /*
1232 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1233 * - mask passed in arg for lines of interest
1234 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1235 * Caller should use TIOCGICOUNT to see which one it was
1236 */
1237 case TIOCMIWAIT:
1238 local_irq_save(flags);
1239 /* note the counters on entry */
1240 cprev = info->icount;
1241 local_irq_restore(flags);
1242 while (1) {
1243 prepare_to_wait(&info->tport.delta_msr_wait,
1244 &wait, TASK_INTERRUPTIBLE);
1245 local_irq_save(flags);
1246 cnow = info->icount; /* atomic copy */
1247 local_irq_restore(flags);
1248 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1249 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1250 ret = -EIO; /* no change => error */
1251 break;
1252 }
1253 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1254 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1255 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1256 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1257 ret = 0;
1258 break;
1259 }
1260 schedule();
1261 /* see if a signal did it */
1262 if (signal_pending(current)) {
1263 ret = -ERESTARTSYS;
1264 break;
1265 }
1266 cprev = cnow;
1267 }
1268 finish_wait(&info->tport.delta_msr_wait, &wait);
1269 return ret;
1270
1271 default:
1272 return -ENOIOCTLCMD;
1273 }
1274 return 0;
1275}
1276
1277static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1278{
1279 struct serial_state *info = tty->driver_data;
1280 unsigned long flags;
1281 unsigned int cflag = tty->termios.c_cflag;
1282
1283 change_speed(tty, info, old_termios);
1284
1285 /* Handle transition to B0 status */
1286 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1287 info->MCR &= ~(SER_DTR|SER_RTS);
1288 local_irq_save(flags);
1289 rtsdtr_ctrl(info->MCR);
1290 local_irq_restore(flags);
1291 }
1292
1293 /* Handle transition away from B0 status */
1294 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1295 info->MCR |= SER_DTR;
1296 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1297 info->MCR |= SER_RTS;
1298 local_irq_save(flags);
1299 rtsdtr_ctrl(info->MCR);
1300 local_irq_restore(flags);
1301 }
1302
1303 /* Handle turning off CRTSCTS */
1304 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1305 tty->hw_stopped = 0;
1306 rs_start(tty);
1307 }
1308
1309#if 0
1310 /*
1311 * No need to wake up processes in open wait, since they
1312 * sample the CLOCAL flag once, and don't recheck it.
1313 * XXX It's not clear whether the current behavior is correct
1314 * or not. Hence, this may change.....
1315 */
1316 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1317 wake_up_interruptible(&info->open_wait);
1318#endif
1319}
1320
1321/*
1322 * ------------------------------------------------------------
1323 * rs_close()
1324 *
1325 * This routine is called when the serial port gets closed. First, we
1326 * wait for the last remaining data to be sent. Then, we unlink its
1327 * async structure from the interrupt chain if necessary, and we free
1328 * that IRQ if nothing is left in the chain.
1329 * ------------------------------------------------------------
1330 */
1331static void rs_close(struct tty_struct *tty, struct file * filp)
1332{
1333 struct serial_state *state = tty->driver_data;
1334 struct tty_port *port = &state->tport;
1335
1336 if (serial_paranoia_check(state, tty->name, "rs_close"))
1337 return;
1338
1339 if (tty_port_close_start(port, tty, filp) == 0)
1340 return;
1341
1342 /*
1343 * At this point we stop accepting input. To do this, we
1344 * disable the receive line status interrupts, and tell the
1345 * interrupt driver to stop checking the data ready bit in the
1346 * line status register.
1347 */
1348 state->read_status_mask &= ~UART_LSR_DR;
1349 if (tty_port_initialized(port)) {
1350 /* disable receive interrupts */
1351 custom.intena = IF_RBF;
1352 mb();
1353 /* clear any pending receive interrupt */
1354 custom.intreq = IF_RBF;
1355 mb();
1356
1357 /*
1358 * Before we drop DTR, make sure the UART transmitter
1359 * has completely drained; this is especially
1360 * important if there is a transmit FIFO!
1361 */
1362 rs_wait_until_sent(tty, state->timeout);
1363 }
1364 shutdown(tty, state);
1365 rs_flush_buffer(tty);
1366
1367 tty_ldisc_flush(tty);
1368 port->tty = NULL;
1369
1370 tty_port_close_end(port, tty);
1371}
1372
1373/*
1374 * rs_wait_until_sent() --- wait until the transmitter is empty
1375 */
1376static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1377{
1378 struct serial_state *info = tty->driver_data;
1379 unsigned long orig_jiffies, char_time;
1380 int lsr;
1381
1382 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1383 return;
1384
1385 if (info->xmit_fifo_size == 0)
1386 return; /* Just in case.... */
1387
1388 orig_jiffies = jiffies;
1389
1390 /*
1391 * Set the check interval to be 1/5 of the estimated time to
1392 * send a single character, and make it at least 1. The check
1393 * interval should also be less than the timeout.
1394 *
1395 * Note: we have to use pretty tight timings here to satisfy
1396 * the NIST-PCTS.
1397 */
1398 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1399 char_time = char_time / 5;
1400 if (char_time == 0)
1401 char_time = 1;
1402 if (timeout)
1403 char_time = min_t(unsigned long, char_time, timeout);
1404 /*
1405 * If the transmitter hasn't cleared in twice the approximate
1406 * amount of time to send the entire FIFO, it probably won't
1407 * ever clear. This assumes the UART isn't doing flow
1408 * control, which is currently the case. Hence, if it ever
1409 * takes longer than info->timeout, this is probably due to a
1410 * UART bug of some kind. So, we clamp the timeout parameter at
1411 * 2*info->timeout.
1412 */
1413 if (!timeout || timeout > 2*info->timeout)
1414 timeout = 2*info->timeout;
1415#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1416 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1417 printk("jiff=%lu...", jiffies);
1418#endif
1419 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1420#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1421 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1422#endif
1423 msleep_interruptible(jiffies_to_msecs(char_time));
1424 if (signal_pending(current))
1425 break;
1426 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1427 break;
1428 }
1429 __set_current_state(TASK_RUNNING);
1430
1431#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1432 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1433#endif
1434}
1435
1436/*
1437 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1438 */
1439static void rs_hangup(struct tty_struct *tty)
1440{
1441 struct serial_state *info = tty->driver_data;
1442
1443 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1444 return;
1445
1446 rs_flush_buffer(tty);
1447 shutdown(tty, info);
1448 info->tport.count = 0;
1449 tty_port_set_active(&info->tport, 0);
1450 info->tport.tty = NULL;
1451 wake_up_interruptible(&info->tport.open_wait);
1452}
1453
1454/*
1455 * This routine is called whenever a serial port is opened. It
1456 * enables interrupts for a serial port, linking in its async structure into
1457 * the IRQ chain. It also performs the serial-specific
1458 * initialization for the tty structure.
1459 */
1460static int rs_open(struct tty_struct *tty, struct file * filp)
1461{
1462 struct serial_state *info = rs_table + tty->index;
1463 struct tty_port *port = &info->tport;
1464 int retval;
1465
1466 port->count++;
1467 port->tty = tty;
1468 tty->driver_data = info;
1469 tty->port = port;
1470 if (serial_paranoia_check(info, tty->name, "rs_open"))
1471 return -ENODEV;
1472
1473 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1474
1475 retval = startup(tty, info);
1476 if (retval) {
1477 return retval;
1478 }
1479
1480 return tty_port_block_til_ready(port, tty, filp);
1481}
1482
1483/*
1484 * /proc fs routines....
1485 */
1486
1487static inline void line_info(struct seq_file *m, int line,
1488 struct serial_state *state)
1489{
1490 char stat_buf[30], control, status;
1491 unsigned long flags;
1492
1493 seq_printf(m, "%d: uart:amiga_builtin", line);
1494
1495 local_irq_save(flags);
1496 status = ciab.pra;
1497 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1498 local_irq_restore(flags);
1499
1500 stat_buf[0] = 0;
1501 stat_buf[1] = 0;
1502 if(!(control & SER_RTS))
1503 strcat(stat_buf, "|RTS");
1504 if(!(status & SER_CTS))
1505 strcat(stat_buf, "|CTS");
1506 if(!(control & SER_DTR))
1507 strcat(stat_buf, "|DTR");
1508 if(!(status & SER_DSR))
1509 strcat(stat_buf, "|DSR");
1510 if(!(status & SER_DCD))
1511 strcat(stat_buf, "|CD");
1512
1513 if (state->quot)
1514 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1515
1516 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1517
1518 if (state->icount.frame)
1519 seq_printf(m, " fe:%d", state->icount.frame);
1520
1521 if (state->icount.parity)
1522 seq_printf(m, " pe:%d", state->icount.parity);
1523
1524 if (state->icount.brk)
1525 seq_printf(m, " brk:%d", state->icount.brk);
1526
1527 if (state->icount.overrun)
1528 seq_printf(m, " oe:%d", state->icount.overrun);
1529
1530 /*
1531 * Last thing is the RS-232 status lines
1532 */
1533 seq_printf(m, " %s\n", stat_buf+1);
1534}
1535
1536static int rs_proc_show(struct seq_file *m, void *v)
1537{
1538 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1539 line_info(m, 0, &rs_table[0]);
1540 return 0;
1541}
1542
1543/*
1544 * ---------------------------------------------------------------------
1545 * rs_init() and friends
1546 *
1547 * rs_init() is called at boot-time to initialize the serial driver.
1548 * ---------------------------------------------------------------------
1549 */
1550
1551/*
1552 * This routine prints out the appropriate serial driver version
1553 * number, and identifies which options were configured into this
1554 * driver.
1555 */
1556static void show_serial_version(void)
1557{
1558 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1559}
1560
1561
1562static const struct tty_operations serial_ops = {
1563 .open = rs_open,
1564 .close = rs_close,
1565 .write = rs_write,
1566 .put_char = rs_put_char,
1567 .flush_chars = rs_flush_chars,
1568 .write_room = rs_write_room,
1569 .chars_in_buffer = rs_chars_in_buffer,
1570 .flush_buffer = rs_flush_buffer,
1571 .ioctl = rs_ioctl,
1572 .throttle = rs_throttle,
1573 .unthrottle = rs_unthrottle,
1574 .set_termios = rs_set_termios,
1575 .stop = rs_stop,
1576 .start = rs_start,
1577 .hangup = rs_hangup,
1578 .break_ctl = rs_break,
1579 .send_xchar = rs_send_xchar,
1580 .wait_until_sent = rs_wait_until_sent,
1581 .tiocmget = rs_tiocmget,
1582 .tiocmset = rs_tiocmset,
1583 .get_icount = rs_get_icount,
1584 .set_serial = set_serial_info,
1585 .get_serial = get_serial_info,
1586 .proc_show = rs_proc_show,
1587};
1588
1589static int amiga_carrier_raised(struct tty_port *port)
1590{
1591 return !(ciab.pra & SER_DCD);
1592}
1593
1594static void amiga_dtr_rts(struct tty_port *port, int raise)
1595{
1596 struct serial_state *info = container_of(port, struct serial_state,
1597 tport);
1598 unsigned long flags;
1599
1600 if (raise)
1601 info->MCR |= SER_DTR|SER_RTS;
1602 else
1603 info->MCR &= ~(SER_DTR|SER_RTS);
1604
1605 local_irq_save(flags);
1606 rtsdtr_ctrl(info->MCR);
1607 local_irq_restore(flags);
1608}
1609
1610static const struct tty_port_operations amiga_port_ops = {
1611 .carrier_raised = amiga_carrier_raised,
1612 .dtr_rts = amiga_dtr_rts,
1613};
1614
1615/*
1616 * The serial driver boot-time initialization code!
1617 */
1618static int __init amiga_serial_probe(struct platform_device *pdev)
1619{
1620 unsigned long flags;
1621 struct serial_state * state;
1622 int error;
1623
1624 serial_driver = alloc_tty_driver(NR_PORTS);
1625 if (!serial_driver)
1626 return -ENOMEM;
1627
1628 show_serial_version();
1629
1630 /* Initialize the tty_driver structure */
1631
1632 serial_driver->driver_name = "amiserial";
1633 serial_driver->name = "ttyS";
1634 serial_driver->major = TTY_MAJOR;
1635 serial_driver->minor_start = 64;
1636 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1637 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1638 serial_driver->init_termios = tty_std_termios;
1639 serial_driver->init_termios.c_cflag =
1640 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1641 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1642 tty_set_operations(serial_driver, &serial_ops);
1643
1644 state = rs_table;
1645 state->port = (int)&custom.serdatr; /* Just to give it a value */
1646 state->custom_divisor = 0;
1647 state->icount.cts = state->icount.dsr =
1648 state->icount.rng = state->icount.dcd = 0;
1649 state->icount.rx = state->icount.tx = 0;
1650 state->icount.frame = state->icount.parity = 0;
1651 state->icount.overrun = state->icount.brk = 0;
1652 tty_port_init(&state->tport);
1653 state->tport.ops = &amiga_port_ops;
1654 tty_port_link_device(&state->tport, serial_driver, 0);
1655
1656 error = tty_register_driver(serial_driver);
1657 if (error)
1658 goto fail_put_tty_driver;
1659
1660 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1661
1662 /* Hardware set up */
1663
1664 state->baud_base = amiga_colorclock;
1665 state->xmit_fifo_size = 1;
1666
1667 /* set ISRs, and then disable the rx interrupts */
1668 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1669 if (error)
1670 goto fail_unregister;
1671
1672 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1673 "serial RX", state);
1674 if (error)
1675 goto fail_free_irq;
1676
1677 local_irq_save(flags);
1678
1679 /* turn off Rx and Tx interrupts */
1680 custom.intena = IF_RBF | IF_TBE;
1681 mb();
1682
1683 /* clear any pending interrupt */
1684 custom.intreq = IF_RBF | IF_TBE;
1685 mb();
1686
1687 local_irq_restore(flags);
1688
1689 /*
1690 * set the appropriate directions for the modem control flags,
1691 * and clear RTS and DTR
1692 */
1693 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1694 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1695
1696 platform_set_drvdata(pdev, state);
1697
1698 return 0;
1699
1700fail_free_irq:
1701 free_irq(IRQ_AMIGA_TBE, state);
1702fail_unregister:
1703 tty_unregister_driver(serial_driver);
1704fail_put_tty_driver:
1705 tty_port_destroy(&state->tport);
1706 put_tty_driver(serial_driver);
1707 return error;
1708}
1709
1710static int __exit amiga_serial_remove(struct platform_device *pdev)
1711{
1712 int error;
1713 struct serial_state *state = platform_get_drvdata(pdev);
1714
1715 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1716 error = tty_unregister_driver(serial_driver);
1717 if (error)
1718 printk("SERIAL: failed to unregister serial driver (%d)\n",
1719 error);
1720 put_tty_driver(serial_driver);
1721 tty_port_destroy(&state->tport);
1722
1723 free_irq(IRQ_AMIGA_TBE, state);
1724 free_irq(IRQ_AMIGA_RBF, state);
1725
1726 return error;
1727}
1728
1729static struct platform_driver amiga_serial_driver = {
1730 .remove = __exit_p(amiga_serial_remove),
1731 .driver = {
1732 .name = "amiga-serial",
1733 },
1734};
1735
1736module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1737
1738
1739#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1740
1741/*
1742 * ------------------------------------------------------------
1743 * Serial console driver
1744 * ------------------------------------------------------------
1745 */
1746
1747static void amiga_serial_putc(char c)
1748{
1749 custom.serdat = (unsigned char)c | 0x100;
1750 while (!(custom.serdatr & 0x2000))
1751 barrier();
1752}
1753
1754/*
1755 * Print a string to the serial port trying not to disturb
1756 * any possible real use of the port...
1757 *
1758 * The console must be locked when we get here.
1759 */
1760static void serial_console_write(struct console *co, const char *s,
1761 unsigned count)
1762{
1763 unsigned short intena = custom.intenar;
1764
1765 custom.intena = IF_TBE;
1766
1767 while (count--) {
1768 if (*s == '\n')
1769 amiga_serial_putc('\r');
1770 amiga_serial_putc(*s++);
1771 }
1772
1773 custom.intena = IF_SETCLR | (intena & IF_TBE);
1774}
1775
1776static struct tty_driver *serial_console_device(struct console *c, int *index)
1777{
1778 *index = 0;
1779 return serial_driver;
1780}
1781
1782static struct console sercons = {
1783 .name = "ttyS",
1784 .write = serial_console_write,
1785 .device = serial_console_device,
1786 .flags = CON_PRINTBUFFER,
1787 .index = -1,
1788};
1789
1790/*
1791 * Register console.
1792 */
1793static int __init amiserial_console_init(void)
1794{
1795 if (!MACH_IS_AMIGA)
1796 return -ENODEV;
1797
1798 register_console(&sercons);
1799 return 0;
1800}
1801console_initcall(amiserial_console_init);
1802
1803#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1804
1805MODULE_LICENSE("GPL");
1806MODULE_ALIAS("platform:amiga-serial");
1807

Warning: That file was not part of the compilation database. It may have many parsing errors.