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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#include <linux/delay.h>
26
27/* Set of debugging defines */
28
29#undef SERIAL_DEBUG_INTR
30#undef SERIAL_DEBUG_OPEN
31#undef SERIAL_DEBUG_FLOW
32#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
33
34/* Sanity checks */
35
36#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
37#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
38 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
39#else
40#define DBG_CNT(s)
41#endif
42
43/*
44 * End of serial driver configuration section.
45 */
46
47#include <linux/module.h>
48
49#include <linux/types.h>
50#include <linux/serial.h>
51#include <linux/serial_reg.h>
52static char *serial_version = "4.30";
53
54#include <linux/errno.h>
55#include <linux/signal.h>
56#include <linux/sched.h>
57#include <linux/kernel.h>
58#include <linux/timer.h>
59#include <linux/interrupt.h>
60#include <linux/tty.h>
61#include <linux/tty_flip.h>
62#include <linux/circ_buf.h>
63#include <linux/console.h>
64#include <linux/major.h>
65#include <linux/string.h>
66#include <linux/fcntl.h>
67#include <linux/ptrace.h>
68#include <linux/ioport.h>
69#include <linux/mm.h>
70#include <linux/seq_file.h>
71#include <linux/slab.h>
72#include <linux/init.h>
73#include <linux/bitops.h>
74#include <linux/platform_device.h>
75
76#include <asm/setup.h>
77
78
79#include <asm/irq.h>
80
81#include <asm/amigahw.h>
82#include <asm/amigaints.h>
83
84struct serial_state {
85 struct tty_port tport;
86 struct circ_buf xmit;
87 struct async_icount icount;
88
89 unsigned long port;
90 int baud_base;
91 int xmit_fifo_size;
92 int custom_divisor;
93 int read_status_mask;
94 int ignore_status_mask;
95 int timeout;
96 int quot;
97 int IER; /* Interrupt Enable Register */
98 int MCR; /* Modem control register */
99 int x_char; /* xon/xoff character */
100};
101
102#define custom amiga_custom
103static char *serial_name = "Amiga-builtin serial driver";
104
105static struct tty_driver *serial_driver;
106
107/* number of characters left in xmit buffer before we ask for more */
108#define WAKEUP_CHARS 256
109
110static unsigned char current_ctl_bits;
111
112static void change_speed(struct tty_struct *tty, struct serial_state *info,
113 struct ktermios *old);
114static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
115
116
117static struct serial_state rs_table[1];
118
119#define NR_PORTS ARRAY_SIZE(rs_table)
120
121#include <linux/uaccess.h>
122
123#define serial_isroot() (capable(CAP_SYS_ADMIN))
124
125/* some serial hardware definitions */
126#define SDR_OVRUN (1<<15)
127#define SDR_RBF (1<<14)
128#define SDR_TBE (1<<13)
129#define SDR_TSRE (1<<12)
130
131#define SERPER_PARENB (1<<15)
132
133#define AC_SETCLR (1<<15)
134#define AC_UARTBRK (1<<11)
135
136#define SER_DTR (1<<7)
137#define SER_RTS (1<<6)
138#define SER_DCD (1<<5)
139#define SER_CTS (1<<4)
140#define SER_DSR (1<<3)
141
142static __inline__ void rtsdtr_ctrl(int bits)
143{
144 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
145}
146
147/*
148 * ------------------------------------------------------------
149 * rs_stop() and rs_start()
150 *
151 * This routines are called before setting or resetting tty->stopped.
152 * They enable or disable transmitter interrupts, as necessary.
153 * ------------------------------------------------------------
154 */
155static void rs_stop(struct tty_struct *tty)
156{
157 struct serial_state *info = tty->driver_data;
158 unsigned long flags;
159
160 local_irq_save(flags);
161 if (info->IER & UART_IER_THRI) {
162 info->IER &= ~UART_IER_THRI;
163 /* disable Tx interrupt and remove any pending interrupts */
164 custom.intena = IF_TBE;
165 mb();
166 custom.intreq = IF_TBE;
167 mb();
168 }
169 local_irq_restore(flags);
170}
171
172static void rs_start(struct tty_struct *tty)
173{
174 struct serial_state *info = tty->driver_data;
175 unsigned long flags;
176
177 local_irq_save(flags);
178 if (info->xmit.head != info->xmit.tail
179 && info->xmit.buf
180 && !(info->IER & UART_IER_THRI)) {
181 info->IER |= UART_IER_THRI;
182 custom.intena = IF_SETCLR | IF_TBE;
183 mb();
184 /* set a pending Tx Interrupt, transmitter should restart now */
185 custom.intreq = IF_SETCLR | IF_TBE;
186 mb();
187 }
188 local_irq_restore(flags);
189}
190
191/*
192 * ----------------------------------------------------------------------
193 *
194 * Here starts the interrupt handling routines. All of the following
195 * subroutines are declared as inline and are folded into
196 * rs_interrupt(). They were separated out for readability's sake.
197 *
198 * Note: rs_interrupt() is a "fast" interrupt, which means that it
199 * runs with interrupts turned off. People who may want to modify
200 * rs_interrupt() should try to keep the interrupt handler as fast as
201 * possible. After you are done making modifications, it is not a bad
202 * idea to do:
203 *
204 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
205 *
206 * and look at the resulting assemble code in serial.s.
207 *
208 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
209 * -----------------------------------------------------------------------
210 */
211
212static void receive_chars(struct serial_state *info)
213{
214 int status;
215 int serdatr;
216 unsigned char ch, flag;
217 struct async_icount *icount;
218 int oe = 0;
219
220 icount = &info->icount;
221
222 status = UART_LSR_DR; /* We obviously have a character! */
223 serdatr = custom.serdatr;
224 mb();
225 custom.intreq = IF_RBF;
226 mb();
227
228 if((serdatr & 0x1ff) == 0)
229 status |= UART_LSR_BI;
230 if(serdatr & SDR_OVRUN)
231 status |= UART_LSR_OE;
232
233 ch = serdatr & 0xff;
234 icount->rx++;
235
236#ifdef SERIAL_DEBUG_INTR
237 printk("DR%02x:%02x...", ch, status);
238#endif
239 flag = TTY_NORMAL;
240
241 /*
242 * We don't handle parity or frame errors - but I have left
243 * the code in, since I'm not sure that the errors can't be
244 * detected.
245 */
246
247 if (status & (UART_LSR_BI | UART_LSR_PE |
248 UART_LSR_FE | UART_LSR_OE)) {
249 /*
250 * For statistics only
251 */
252 if (status & UART_LSR_BI) {
253 status &= ~(UART_LSR_FE | UART_LSR_PE);
254 icount->brk++;
255 } else if (status & UART_LSR_PE)
256 icount->parity++;
257 else if (status & UART_LSR_FE)
258 icount->frame++;
259 if (status & UART_LSR_OE)
260 icount->overrun++;
261
262 /*
263 * Now check to see if character should be
264 * ignored, and mask off conditions which
265 * should be ignored.
266 */
267 if (status & info->ignore_status_mask)
268 goto out;
269
270 status &= info->read_status_mask;
271
272 if (status & (UART_LSR_BI)) {
273#ifdef SERIAL_DEBUG_INTR
274 printk("handling break....");
275#endif
276 flag = TTY_BREAK;
277 if (info->tport.flags & ASYNC_SAK)
278 do_SAK(info->tport.tty);
279 } else if (status & UART_LSR_PE)
280 flag = TTY_PARITY;
281 else if (status & UART_LSR_FE)
282 flag = TTY_FRAME;
283 if (status & UART_LSR_OE) {
284 /*
285 * Overrun is special, since it's
286 * reported immediately, and doesn't
287 * affect the current character
288 */
289 oe = 1;
290 }
291 }
292 tty_insert_flip_char(&info->tport, ch, flag);
293 if (oe == 1)
294 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
295 tty_flip_buffer_push(&info->tport);
296out:
297 return;
298}
299
300static void transmit_chars(struct serial_state *info)
301{
302 custom.intreq = IF_TBE;
303 mb();
304 if (info->x_char) {
305 custom.serdat = info->x_char | 0x100;
306 mb();
307 info->icount.tx++;
308 info->x_char = 0;
309 return;
310 }
311 if (info->xmit.head == info->xmit.tail
312 || info->tport.tty->stopped
313 || info->tport.tty->hw_stopped) {
314 info->IER &= ~UART_IER_THRI;
315 custom.intena = IF_TBE;
316 mb();
317 return;
318 }
319
320 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
321 mb();
322 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
323 info->icount.tx++;
324
325 if (CIRC_CNT(info->xmit.head,
326 info->xmit.tail,
327 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
328 tty_wakeup(info->tport.tty);
329
330#ifdef SERIAL_DEBUG_INTR
331 printk("THRE...");
332#endif
333 if (info->xmit.head == info->xmit.tail) {
334 custom.intena = IF_TBE;
335 mb();
336 info->IER &= ~UART_IER_THRI;
337 }
338}
339
340static void check_modem_status(struct serial_state *info)
341{
342 struct tty_port *port = &info->tport;
343 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
344 unsigned char dstatus;
345 struct async_icount *icount;
346
347 /* Determine bits that have changed */
348 dstatus = status ^ current_ctl_bits;
349 current_ctl_bits = status;
350
351 if (dstatus) {
352 icount = &info->icount;
353 /* update input line counters */
354 if (dstatus & SER_DSR)
355 icount->dsr++;
356 if (dstatus & SER_DCD) {
357 icount->dcd++;
358 }
359 if (dstatus & SER_CTS)
360 icount->cts++;
361 wake_up_interruptible(&port->delta_msr_wait);
362 }
363
364 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
365#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
366 printk("ttyS%d CD now %s...", info->line,
367 (!(status & SER_DCD)) ? "on" : "off");
368#endif
369 if (!(status & SER_DCD))
370 wake_up_interruptible(&port->open_wait);
371 else {
372#ifdef SERIAL_DEBUG_OPEN
373 printk("doing serial hangup...");
374#endif
375 if (port->tty)
376 tty_hangup(port->tty);
377 }
378 }
379 if (tty_port_cts_enabled(port)) {
380 if (port->tty->hw_stopped) {
381 if (!(status & SER_CTS)) {
382#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
383 printk("CTS tx start...");
384#endif
385 port->tty->hw_stopped = 0;
386 info->IER |= UART_IER_THRI;
387 custom.intena = IF_SETCLR | IF_TBE;
388 mb();
389 /* set a pending Tx Interrupt, transmitter should restart now */
390 custom.intreq = IF_SETCLR | IF_TBE;
391 mb();
392 tty_wakeup(port->tty);
393 return;
394 }
395 } else {
396 if ((status & SER_CTS)) {
397#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
398 printk("CTS tx stop...");
399#endif
400 port->tty->hw_stopped = 1;
401 info->IER &= ~UART_IER_THRI;
402 /* disable Tx interrupt and remove any pending interrupts */
403 custom.intena = IF_TBE;
404 mb();
405 custom.intreq = IF_TBE;
406 mb();
407 }
408 }
409 }
410}
411
412static irqreturn_t ser_vbl_int( int irq, void *data)
413{
414 /* vbl is just a periodic interrupt we tie into to update modem status */
415 struct serial_state *info = data;
416 /*
417 * TBD - is it better to unregister from this interrupt or to
418 * ignore it if MSI is clear ?
419 */
420 if(info->IER & UART_IER_MSI)
421 check_modem_status(info);
422 return IRQ_HANDLED;
423}
424
425static irqreturn_t ser_rx_int(int irq, void *dev_id)
426{
427 struct serial_state *info = dev_id;
428
429#ifdef SERIAL_DEBUG_INTR
430 printk("ser_rx_int...");
431#endif
432
433 if (!info->tport.tty)
434 return IRQ_NONE;
435
436 receive_chars(info);
437#ifdef SERIAL_DEBUG_INTR
438 printk("end.\n");
439#endif
440 return IRQ_HANDLED;
441}
442
443static irqreturn_t ser_tx_int(int irq, void *dev_id)
444{
445 struct serial_state *info = dev_id;
446
447 if (custom.serdatr & SDR_TBE) {
448#ifdef SERIAL_DEBUG_INTR
449 printk("ser_tx_int...");
450#endif
451
452 if (!info->tport.tty)
453 return IRQ_NONE;
454
455 transmit_chars(info);
456#ifdef SERIAL_DEBUG_INTR
457 printk("end.\n");
458#endif
459 }
460 return IRQ_HANDLED;
461}
462
463/*
464 * -------------------------------------------------------------------
465 * Here ends the serial interrupt routines.
466 * -------------------------------------------------------------------
467 */
468
469/*
470 * ---------------------------------------------------------------
471 * Low level utility subroutines for the serial driver: routines to
472 * figure out the appropriate timeout for an interrupt chain, routines
473 * to initialize and startup a serial port, and routines to shutdown a
474 * serial port. Useful stuff like that.
475 * ---------------------------------------------------------------
476 */
477
478static int startup(struct tty_struct *tty, struct serial_state *info)
479{
480 struct tty_port *port = &info->tport;
481 unsigned long flags;
482 int retval=0;
483 unsigned long page;
484
485 page = get_zeroed_page(GFP_KERNEL);
486 if (!page)
487 return -ENOMEM;
488
489 local_irq_save(flags);
490
491 if (tty_port_initialized(port)) {
492 free_page(page);
493 goto errout;
494 }
495
496 if (info->xmit.buf)
497 free_page(page);
498 else
499 info->xmit.buf = (unsigned char *) page;
500
501#ifdef SERIAL_DEBUG_OPEN
502 printk("starting up ttys%d ...", info->line);
503#endif
504
505 /* Clear anything in the input buffer */
506
507 custom.intreq = IF_RBF;
508 mb();
509
510 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
511 if (retval) {
512 if (serial_isroot()) {
513 set_bit(TTY_IO_ERROR, &tty->flags);
514 retval = 0;
515 }
516 goto errout;
517 }
518
519 /* enable both Rx and Tx interrupts */
520 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
521 mb();
522 info->IER = UART_IER_MSI;
523
524 /* remember current state of the DCD and CTS bits */
525 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
526
527 info->MCR = 0;
528 if (C_BAUD(tty))
529 info->MCR = SER_DTR | SER_RTS;
530 rtsdtr_ctrl(info->MCR);
531
532 clear_bit(TTY_IO_ERROR, &tty->flags);
533 info->xmit.head = info->xmit.tail = 0;
534
535 /*
536 * and set the speed of the serial port
537 */
538 change_speed(tty, info, NULL);
539
540 tty_port_set_initialized(port, 1);
541 local_irq_restore(flags);
542 return 0;
543
544errout:
545 local_irq_restore(flags);
546 return retval;
547}
548
549/*
550 * This routine will shutdown a serial port; interrupts are disabled, and
551 * DTR is dropped if the hangup on close termio flag is on.
552 */
553static void shutdown(struct tty_struct *tty, struct serial_state *info)
554{
555 unsigned long flags;
556 struct serial_state *state;
557
558 if (!tty_port_initialized(&info->tport))
559 return;
560
561 state = info;
562
563#ifdef SERIAL_DEBUG_OPEN
564 printk("Shutting down serial port %d ....\n", info->line);
565#endif
566
567 local_irq_save(flags); /* Disable interrupts */
568
569 /*
570 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
571 * here so the queue might never be waken up
572 */
573 wake_up_interruptible(&info->tport.delta_msr_wait);
574
575 /*
576 * Free the IRQ, if necessary
577 */
578 free_irq(IRQ_AMIGA_VERTB, info);
579
580 if (info->xmit.buf) {
581 free_page((unsigned long) info->xmit.buf);
582 info->xmit.buf = NULL;
583 }
584
585 info->IER = 0;
586 custom.intena = IF_RBF | IF_TBE;
587 mb();
588
589 /* disable break condition */
590 custom.adkcon = AC_UARTBRK;
591 mb();
592
593 if (C_HUPCL(tty))
594 info->MCR &= ~(SER_DTR|SER_RTS);
595 rtsdtr_ctrl(info->MCR);
596
597 set_bit(TTY_IO_ERROR, &tty->flags);
598
599 tty_port_set_initialized(&info->tport, 0);
600 local_irq_restore(flags);
601}
602
603
604/*
605 * This routine is called to set the UART divisor registers to match
606 * the specified baud rate for a serial port.
607 */
608static void change_speed(struct tty_struct *tty, struct serial_state *info,
609 struct ktermios *old_termios)
610{
611 struct tty_port *port = &info->tport;
612 int quot = 0, baud_base, baud;
613 unsigned cflag, cval = 0;
614 int bits;
615 unsigned long flags;
616
617 cflag = tty->termios.c_cflag;
618
619 /* Byte size is always 8 bits plus parity bit if requested */
620
621 cval = 3; bits = 10;
622 if (cflag & CSTOPB) {
623 cval |= 0x04;
624 bits++;
625 }
626 if (cflag & PARENB) {
627 cval |= UART_LCR_PARITY;
628 bits++;
629 }
630 if (!(cflag & PARODD))
631 cval |= UART_LCR_EPAR;
632#ifdef CMSPAR
633 if (cflag & CMSPAR)
634 cval |= UART_LCR_SPAR;
635#endif
636
637 /* Determine divisor based on baud rate */
638 baud = tty_get_baud_rate(tty);
639 if (!baud)
640 baud = 9600; /* B0 transition handled in rs_set_termios */
641 baud_base = info->baud_base;
642 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
643 quot = info->custom_divisor;
644 else {
645 if (baud == 134)
646 /* Special case since 134 is really 134.5 */
647 quot = (2*baud_base / 269);
648 else if (baud)
649 quot = baud_base / baud;
650 }
651 /* If the quotient is zero refuse the change */
652 if (!quot && old_termios) {
653 /* FIXME: Will need updating for new tty in the end */
654 tty->termios.c_cflag &= ~CBAUD;
655 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
656 baud = tty_get_baud_rate(tty);
657 if (!baud)
658 baud = 9600;
659 if (baud == 38400 &&
660 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
661 quot = info->custom_divisor;
662 else {
663 if (baud == 134)
664 /* Special case since 134 is really 134.5 */
665 quot = (2*baud_base / 269);
666 else if (baud)
667 quot = baud_base / baud;
668 }
669 }
670 /* As a last resort, if the quotient is zero, default to 9600 bps */
671 if (!quot)
672 quot = baud_base / 9600;
673 info->quot = quot;
674 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
675 info->timeout += HZ/50; /* Add .02 seconds of slop */
676
677 /* CTS flow control flag and modem status interrupts */
678 info->IER &= ~UART_IER_MSI;
679 if (port->flags & ASYNC_HARDPPS_CD)
680 info->IER |= UART_IER_MSI;
681 tty_port_set_cts_flow(port, cflag & CRTSCTS);
682 if (cflag & CRTSCTS)
683 info->IER |= UART_IER_MSI;
684 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
685 if (~cflag & CLOCAL)
686 info->IER |= UART_IER_MSI;
687 /* TBD:
688 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
689 */
690
691 /*
692 * Set up parity check flag
693 */
694
695 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
696 if (I_INPCK(tty))
697 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
698 if (I_BRKINT(tty) || I_PARMRK(tty))
699 info->read_status_mask |= UART_LSR_BI;
700
701 /*
702 * Characters to ignore
703 */
704 info->ignore_status_mask = 0;
705 if (I_IGNPAR(tty))
706 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
707 if (I_IGNBRK(tty)) {
708 info->ignore_status_mask |= UART_LSR_BI;
709 /*
710 * If we're ignore parity and break indicators, ignore
711 * overruns too. (For real raw support).
712 */
713 if (I_IGNPAR(tty))
714 info->ignore_status_mask |= UART_LSR_OE;
715 }
716 /*
717 * !!! ignore all characters if CREAD is not set
718 */
719 if ((cflag & CREAD) == 0)
720 info->ignore_status_mask |= UART_LSR_DR;
721 local_irq_save(flags);
722
723 {
724 short serper;
725
726 /* Set up the baud rate */
727 serper = quot - 1;
728
729 /* Enable or disable parity bit */
730
731 if(cval & UART_LCR_PARITY)
732 serper |= (SERPER_PARENB);
733
734 custom.serper = serper;
735 mb();
736 }
737
738 local_irq_restore(flags);
739}
740
741static int rs_put_char(struct tty_struct *tty, unsigned char ch)
742{
743 struct serial_state *info;
744 unsigned long flags;
745
746 info = tty->driver_data;
747
748 if (!info->xmit.buf)
749 return 0;
750
751 local_irq_save(flags);
752 if (CIRC_SPACE(info->xmit.head,
753 info->xmit.tail,
754 SERIAL_XMIT_SIZE) == 0) {
755 local_irq_restore(flags);
756 return 0;
757 }
758
759 info->xmit.buf[info->xmit.head++] = ch;
760 info->xmit.head &= SERIAL_XMIT_SIZE-1;
761 local_irq_restore(flags);
762 return 1;
763}
764
765static void rs_flush_chars(struct tty_struct *tty)
766{
767 struct serial_state *info = tty->driver_data;
768 unsigned long flags;
769
770 if (info->xmit.head == info->xmit.tail
771 || tty->stopped
772 || tty->hw_stopped
773 || !info->xmit.buf)
774 return;
775
776 local_irq_save(flags);
777 info->IER |= UART_IER_THRI;
778 custom.intena = IF_SETCLR | IF_TBE;
779 mb();
780 /* set a pending Tx Interrupt, transmitter should restart now */
781 custom.intreq = IF_SETCLR | IF_TBE;
782 mb();
783 local_irq_restore(flags);
784}
785
786static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
787{
788 int c, ret = 0;
789 struct serial_state *info = tty->driver_data;
790 unsigned long flags;
791
792 if (!info->xmit.buf)
793 return 0;
794
795 local_irq_save(flags);
796 while (1) {
797 c = CIRC_SPACE_TO_END(info->xmit.head,
798 info->xmit.tail,
799 SERIAL_XMIT_SIZE);
800 if (count < c)
801 c = count;
802 if (c <= 0) {
803 break;
804 }
805 memcpy(info->xmit.buf + info->xmit.head, buf, c);
806 info->xmit.head = ((info->xmit.head + c) &
807 (SERIAL_XMIT_SIZE-1));
808 buf += c;
809 count -= c;
810 ret += c;
811 }
812 local_irq_restore(flags);
813
814 if (info->xmit.head != info->xmit.tail
815 && !tty->stopped
816 && !tty->hw_stopped
817 && !(info->IER & UART_IER_THRI)) {
818 info->IER |= UART_IER_THRI;
819 local_irq_disable();
820 custom.intena = IF_SETCLR | IF_TBE;
821 mb();
822 /* set a pending Tx Interrupt, transmitter should restart now */
823 custom.intreq = IF_SETCLR | IF_TBE;
824 mb();
825 local_irq_restore(flags);
826 }
827 return ret;
828}
829
830static int rs_write_room(struct tty_struct *tty)
831{
832 struct serial_state *info = tty->driver_data;
833
834 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
835}
836
837static int rs_chars_in_buffer(struct tty_struct *tty)
838{
839 struct serial_state *info = tty->driver_data;
840
841 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
842}
843
844static void rs_flush_buffer(struct tty_struct *tty)
845{
846 struct serial_state *info = tty->driver_data;
847 unsigned long flags;
848
849 local_irq_save(flags);
850 info->xmit.head = info->xmit.tail = 0;
851 local_irq_restore(flags);
852 tty_wakeup(tty);
853}
854
855/*
856 * This function is used to send a high-priority XON/XOFF character to
857 * the device
858 */
859static void rs_send_xchar(struct tty_struct *tty, char ch)
860{
861 struct serial_state *info = tty->driver_data;
862 unsigned long flags;
863
864 info->x_char = ch;
865 if (ch) {
866 /* Make sure transmit interrupts are on */
867
868 /* Check this ! */
869 local_irq_save(flags);
870 if(!(custom.intenar & IF_TBE)) {
871 custom.intena = IF_SETCLR | IF_TBE;
872 mb();
873 /* set a pending Tx Interrupt, transmitter should restart now */
874 custom.intreq = IF_SETCLR | IF_TBE;
875 mb();
876 }
877 local_irq_restore(flags);
878
879 info->IER |= UART_IER_THRI;
880 }
881}
882
883/*
884 * ------------------------------------------------------------
885 * rs_throttle()
886 *
887 * This routine is called by the upper-layer tty layer to signal that
888 * incoming characters should be throttled.
889 * ------------------------------------------------------------
890 */
891static void rs_throttle(struct tty_struct * tty)
892{
893 struct serial_state *info = tty->driver_data;
894 unsigned long flags;
895#ifdef SERIAL_DEBUG_THROTTLE
896 printk("throttle %s ....\n", tty_name(tty));
897#endif
898
899 if (I_IXOFF(tty))
900 rs_send_xchar(tty, STOP_CHAR(tty));
901
902 if (C_CRTSCTS(tty))
903 info->MCR &= ~SER_RTS;
904
905 local_irq_save(flags);
906 rtsdtr_ctrl(info->MCR);
907 local_irq_restore(flags);
908}
909
910static void rs_unthrottle(struct tty_struct * tty)
911{
912 struct serial_state *info = tty->driver_data;
913 unsigned long flags;
914#ifdef SERIAL_DEBUG_THROTTLE
915 printk("unthrottle %s ....\n", tty_name(tty));
916#endif
917
918 if (I_IXOFF(tty)) {
919 if (info->x_char)
920 info->x_char = 0;
921 else
922 rs_send_xchar(tty, START_CHAR(tty));
923 }
924 if (C_CRTSCTS(tty))
925 info->MCR |= SER_RTS;
926 local_irq_save(flags);
927 rtsdtr_ctrl(info->MCR);
928 local_irq_restore(flags);
929}
930
931/*
932 * ------------------------------------------------------------
933 * rs_ioctl() and friends
934 * ------------------------------------------------------------
935 */
936
937static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
938{
939 struct serial_state *state = tty->driver_data;
940
941 tty_lock(tty);
942 ss->line = tty->index;
943 ss->port = state->port;
944 ss->flags = state->tport.flags;
945 ss->xmit_fifo_size = state->xmit_fifo_size;
946 ss->baud_base = state->baud_base;
947 ss->close_delay = state->tport.close_delay;
948 ss->closing_wait = state->tport.closing_wait;
949 ss->custom_divisor = state->custom_divisor;
950 tty_unlock(tty);
951 return 0;
952}
953
954static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
955{
956 struct serial_state *state = tty->driver_data;
957 struct tty_port *port = &state->tport;
958 bool change_spd;
959 int retval = 0;
960
961 tty_lock(tty);
962 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
963 ss->custom_divisor != state->custom_divisor;
964 if (ss->irq || ss->port != state->port ||
965 ss->xmit_fifo_size != state->xmit_fifo_size) {
966 tty_unlock(tty);
967 return -EINVAL;
968 }
969
970 if (!serial_isroot()) {
971 if ((ss->baud_base != state->baud_base) ||
972 (ss->close_delay != port->close_delay) ||
973 (ss->xmit_fifo_size != state->xmit_fifo_size) ||
974 ((ss->flags & ~ASYNC_USR_MASK) !=
975 (port->flags & ~ASYNC_USR_MASK))) {
976 tty_unlock(tty);
977 return -EPERM;
978 }
979 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
980 (ss->flags & ASYNC_USR_MASK));
981 state->custom_divisor = ss->custom_divisor;
982 goto check_and_exit;
983 }
984
985 if (ss->baud_base < 9600) {
986 tty_unlock(tty);
987 return -EINVAL;
988 }
989
990 /*
991 * OK, past this point, all the error checking has been done.
992 * At this point, we start making changes.....
993 */
994
995 state->baud_base = ss->baud_base;
996 port->flags = ((port->flags & ~ASYNC_FLAGS) |
997 (ss->flags & ASYNC_FLAGS));
998 state->custom_divisor = ss->custom_divisor;
999 port->close_delay = ss->close_delay * HZ/100;
1000 port->closing_wait = ss->closing_wait * HZ/100;
1001 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1002
1003check_and_exit:
1004 if (tty_port_initialized(port)) {
1005 if (change_spd) {
1006 /* warn about deprecation unless clearing */
1007 if (ss->flags & ASYNC_SPD_MASK)
1008 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
1009 change_speed(tty, state, NULL);
1010 }
1011 } else
1012 retval = startup(tty, state);
1013 tty_unlock(tty);
1014 return retval;
1015}
1016
1017/*
1018 * get_lsr_info - get line status register info
1019 *
1020 * Purpose: Let user call ioctl() to get info when the UART physically
1021 * is emptied. On bus types like RS485, the transmitter must
1022 * release the bus after transmitting. This must be done when
1023 * the transmit shift register is empty, not be done when the
1024 * transmit holding register is empty. This functionality
1025 * allows an RS485 driver to be written in user space.
1026 */
1027static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1028{
1029 unsigned char status;
1030 unsigned int result;
1031 unsigned long flags;
1032
1033 local_irq_save(flags);
1034 status = custom.serdatr;
1035 mb();
1036 local_irq_restore(flags);
1037 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1038 if (copy_to_user(value, &result, sizeof(int)))
1039 return -EFAULT;
1040 return 0;
1041}
1042
1043
1044static int rs_tiocmget(struct tty_struct *tty)
1045{
1046 struct serial_state *info = tty->driver_data;
1047 unsigned char control, status;
1048 unsigned long flags;
1049
1050 if (tty_io_error(tty))
1051 return -EIO;
1052
1053 control = info->MCR;
1054 local_irq_save(flags);
1055 status = ciab.pra;
1056 local_irq_restore(flags);
1057 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1058 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1059 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1060 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1061 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1062}
1063
1064static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1065 unsigned int clear)
1066{
1067 struct serial_state *info = tty->driver_data;
1068 unsigned long flags;
1069
1070 if (tty_io_error(tty))
1071 return -EIO;
1072
1073 local_irq_save(flags);
1074 if (set & TIOCM_RTS)
1075 info->MCR |= SER_RTS;
1076 if (set & TIOCM_DTR)
1077 info->MCR |= SER_DTR;
1078 if (clear & TIOCM_RTS)
1079 info->MCR &= ~SER_RTS;
1080 if (clear & TIOCM_DTR)
1081 info->MCR &= ~SER_DTR;
1082 rtsdtr_ctrl(info->MCR);
1083 local_irq_restore(flags);
1084 return 0;
1085}
1086
1087/*
1088 * rs_break() --- routine which turns the break handling on or off
1089 */
1090static int rs_break(struct tty_struct *tty, int break_state)
1091{
1092 unsigned long flags;
1093
1094 local_irq_save(flags);
1095 if (break_state == -1)
1096 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1097 else
1098 custom.adkcon = AC_UARTBRK;
1099 mb();
1100 local_irq_restore(flags);
1101 return 0;
1102}
1103
1104/*
1105 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1106 * Return: write counters to the user passed counter struct
1107 * NB: both 1->0 and 0->1 transitions are counted except for
1108 * RI where only 0->1 is counted.
1109 */
1110static int rs_get_icount(struct tty_struct *tty,
1111 struct serial_icounter_struct *icount)
1112{
1113 struct serial_state *info = tty->driver_data;
1114 struct async_icount cnow;
1115 unsigned long flags;
1116
1117 local_irq_save(flags);
1118 cnow = info->icount;
1119 local_irq_restore(flags);
1120 icount->cts = cnow.cts;
1121 icount->dsr = cnow.dsr;
1122 icount->rng = cnow.rng;
1123 icount->dcd = cnow.dcd;
1124 icount->rx = cnow.rx;
1125 icount->tx = cnow.tx;
1126 icount->frame = cnow.frame;
1127 icount->overrun = cnow.overrun;
1128 icount->parity = cnow.parity;
1129 icount->brk = cnow.brk;
1130 icount->buf_overrun = cnow.buf_overrun;
1131
1132 return 0;
1133}
1134
1135static int rs_ioctl(struct tty_struct *tty,
1136 unsigned int cmd, unsigned long arg)
1137{
1138 struct serial_state *info = tty->driver_data;
1139 struct async_icount cprev, cnow; /* kernel counter temps */
1140 void __user *argp = (void __user *)arg;
1141 unsigned long flags;
1142 DEFINE_WAIT(wait);
1143 int ret;
1144
1145 if ((cmd != TIOCSERCONFIG) &&
1146 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1147 if (tty_io_error(tty))
1148 return -EIO;
1149 }
1150
1151 switch (cmd) {
1152 case TIOCSERCONFIG:
1153 return 0;
1154
1155 case TIOCSERGETLSR: /* Get line status register */
1156 return get_lsr_info(info, argp);
1157
1158 /*
1159 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1160 * - mask passed in arg for lines of interest
1161 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1162 * Caller should use TIOCGICOUNT to see which one it was
1163 */
1164 case TIOCMIWAIT:
1165 local_irq_save(flags);
1166 /* note the counters on entry */
1167 cprev = info->icount;
1168 local_irq_restore(flags);
1169 while (1) {
1170 prepare_to_wait(&info->tport.delta_msr_wait,
1171 &wait, TASK_INTERRUPTIBLE);
1172 local_irq_save(flags);
1173 cnow = info->icount; /* atomic copy */
1174 local_irq_restore(flags);
1175 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1176 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1177 ret = -EIO; /* no change => error */
1178 break;
1179 }
1180 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1181 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1182 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1183 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1184 ret = 0;
1185 break;
1186 }
1187 schedule();
1188 /* see if a signal did it */
1189 if (signal_pending(current)) {
1190 ret = -ERESTARTSYS;
1191 break;
1192 }
1193 cprev = cnow;
1194 }
1195 finish_wait(&info->tport.delta_msr_wait, &wait);
1196 return ret;
1197
1198 default:
1199 return -ENOIOCTLCMD;
1200 }
1201 return 0;
1202}
1203
1204static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1205{
1206 struct serial_state *info = tty->driver_data;
1207 unsigned long flags;
1208 unsigned int cflag = tty->termios.c_cflag;
1209
1210 change_speed(tty, info, old_termios);
1211
1212 /* Handle transition to B0 status */
1213 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1214 info->MCR &= ~(SER_DTR|SER_RTS);
1215 local_irq_save(flags);
1216 rtsdtr_ctrl(info->MCR);
1217 local_irq_restore(flags);
1218 }
1219
1220 /* Handle transition away from B0 status */
1221 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1222 info->MCR |= SER_DTR;
1223 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1224 info->MCR |= SER_RTS;
1225 local_irq_save(flags);
1226 rtsdtr_ctrl(info->MCR);
1227 local_irq_restore(flags);
1228 }
1229
1230 /* Handle turning off CRTSCTS */
1231 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1232 tty->hw_stopped = 0;
1233 rs_start(tty);
1234 }
1235
1236#if 0
1237 /*
1238 * No need to wake up processes in open wait, since they
1239 * sample the CLOCAL flag once, and don't recheck it.
1240 * XXX It's not clear whether the current behavior is correct
1241 * or not. Hence, this may change.....
1242 */
1243 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1244 wake_up_interruptible(&info->open_wait);
1245#endif
1246}
1247
1248/*
1249 * ------------------------------------------------------------
1250 * rs_close()
1251 *
1252 * This routine is called when the serial port gets closed. First, we
1253 * wait for the last remaining data to be sent. Then, we unlink its
1254 * async structure from the interrupt chain if necessary, and we free
1255 * that IRQ if nothing is left in the chain.
1256 * ------------------------------------------------------------
1257 */
1258static void rs_close(struct tty_struct *tty, struct file * filp)
1259{
1260 struct serial_state *state = tty->driver_data;
1261 struct tty_port *port = &state->tport;
1262
1263 if (tty_port_close_start(port, tty, filp) == 0)
1264 return;
1265
1266 /*
1267 * At this point we stop accepting input. To do this, we
1268 * disable the receive line status interrupts, and tell the
1269 * interrupt driver to stop checking the data ready bit in the
1270 * line status register.
1271 */
1272 state->read_status_mask &= ~UART_LSR_DR;
1273 if (tty_port_initialized(port)) {
1274 /* disable receive interrupts */
1275 custom.intena = IF_RBF;
1276 mb();
1277 /* clear any pending receive interrupt */
1278 custom.intreq = IF_RBF;
1279 mb();
1280
1281 /*
1282 * Before we drop DTR, make sure the UART transmitter
1283 * has completely drained; this is especially
1284 * important if there is a transmit FIFO!
1285 */
1286 rs_wait_until_sent(tty, state->timeout);
1287 }
1288 shutdown(tty, state);
1289 rs_flush_buffer(tty);
1290
1291 tty_ldisc_flush(tty);
1292 port->tty = NULL;
1293
1294 tty_port_close_end(port, tty);
1295}
1296
1297/*
1298 * rs_wait_until_sent() --- wait until the transmitter is empty
1299 */
1300static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1301{
1302 struct serial_state *info = tty->driver_data;
1303 unsigned long orig_jiffies, char_time;
1304 int lsr;
1305
1306 if (info->xmit_fifo_size == 0)
1307 return; /* Just in case.... */
1308
1309 orig_jiffies = jiffies;
1310
1311 /*
1312 * Set the check interval to be 1/5 of the estimated time to
1313 * send a single character, and make it at least 1. The check
1314 * interval should also be less than the timeout.
1315 *
1316 * Note: we have to use pretty tight timings here to satisfy
1317 * the NIST-PCTS.
1318 */
1319 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1320 char_time = char_time / 5;
1321 if (char_time == 0)
1322 char_time = 1;
1323 if (timeout)
1324 char_time = min_t(unsigned long, char_time, timeout);
1325 /*
1326 * If the transmitter hasn't cleared in twice the approximate
1327 * amount of time to send the entire FIFO, it probably won't
1328 * ever clear. This assumes the UART isn't doing flow
1329 * control, which is currently the case. Hence, if it ever
1330 * takes longer than info->timeout, this is probably due to a
1331 * UART bug of some kind. So, we clamp the timeout parameter at
1332 * 2*info->timeout.
1333 */
1334 if (!timeout || timeout > 2*info->timeout)
1335 timeout = 2*info->timeout;
1336#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1337 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1338 printk("jiff=%lu...", jiffies);
1339#endif
1340 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1341#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1342 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1343#endif
1344 msleep_interruptible(jiffies_to_msecs(char_time));
1345 if (signal_pending(current))
1346 break;
1347 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1348 break;
1349 }
1350 __set_current_state(TASK_RUNNING);
1351
1352#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1353 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1354#endif
1355}
1356
1357/*
1358 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1359 */
1360static void rs_hangup(struct tty_struct *tty)
1361{
1362 struct serial_state *info = tty->driver_data;
1363
1364 rs_flush_buffer(tty);
1365 shutdown(tty, info);
1366 info->tport.count = 0;
1367 tty_port_set_active(&info->tport, 0);
1368 info->tport.tty = NULL;
1369 wake_up_interruptible(&info->tport.open_wait);
1370}
1371
1372/*
1373 * This routine is called whenever a serial port is opened. It
1374 * enables interrupts for a serial port, linking in its async structure into
1375 * the IRQ chain. It also performs the serial-specific
1376 * initialization for the tty structure.
1377 */
1378static int rs_open(struct tty_struct *tty, struct file * filp)
1379{
1380 struct serial_state *info = rs_table + tty->index;
1381 struct tty_port *port = &info->tport;
1382 int retval;
1383
1384 port->count++;
1385 port->tty = tty;
1386 tty->driver_data = info;
1387 tty->port = port;
1388
1389 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1390
1391 retval = startup(tty, info);
1392 if (retval) {
1393 return retval;
1394 }
1395
1396 return tty_port_block_til_ready(port, tty, filp);
1397}
1398
1399/*
1400 * /proc fs routines....
1401 */
1402
1403static inline void line_info(struct seq_file *m, int line,
1404 struct serial_state *state)
1405{
1406 char stat_buf[30], control, status;
1407 unsigned long flags;
1408
1409 seq_printf(m, "%d: uart:amiga_builtin", line);
1410
1411 local_irq_save(flags);
1412 status = ciab.pra;
1413 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1414 local_irq_restore(flags);
1415
1416 stat_buf[0] = 0;
1417 stat_buf[1] = 0;
1418 if(!(control & SER_RTS))
1419 strcat(stat_buf, "|RTS");
1420 if(!(status & SER_CTS))
1421 strcat(stat_buf, "|CTS");
1422 if(!(control & SER_DTR))
1423 strcat(stat_buf, "|DTR");
1424 if(!(status & SER_DSR))
1425 strcat(stat_buf, "|DSR");
1426 if(!(status & SER_DCD))
1427 strcat(stat_buf, "|CD");
1428
1429 if (state->quot)
1430 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1431
1432 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1433
1434 if (state->icount.frame)
1435 seq_printf(m, " fe:%d", state->icount.frame);
1436
1437 if (state->icount.parity)
1438 seq_printf(m, " pe:%d", state->icount.parity);
1439
1440 if (state->icount.brk)
1441 seq_printf(m, " brk:%d", state->icount.brk);
1442
1443 if (state->icount.overrun)
1444 seq_printf(m, " oe:%d", state->icount.overrun);
1445
1446 /*
1447 * Last thing is the RS-232 status lines
1448 */
1449 seq_printf(m, " %s\n", stat_buf+1);
1450}
1451
1452static int rs_proc_show(struct seq_file *m, void *v)
1453{
1454 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1455 line_info(m, 0, &rs_table[0]);
1456 return 0;
1457}
1458
1459/*
1460 * ---------------------------------------------------------------------
1461 * rs_init() and friends
1462 *
1463 * rs_init() is called at boot-time to initialize the serial driver.
1464 * ---------------------------------------------------------------------
1465 */
1466
1467/*
1468 * This routine prints out the appropriate serial driver version
1469 * number, and identifies which options were configured into this
1470 * driver.
1471 */
1472static void show_serial_version(void)
1473{
1474 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1475}
1476
1477
1478static const struct tty_operations serial_ops = {
1479 .open = rs_open,
1480 .close = rs_close,
1481 .write = rs_write,
1482 .put_char = rs_put_char,
1483 .flush_chars = rs_flush_chars,
1484 .write_room = rs_write_room,
1485 .chars_in_buffer = rs_chars_in_buffer,
1486 .flush_buffer = rs_flush_buffer,
1487 .ioctl = rs_ioctl,
1488 .throttle = rs_throttle,
1489 .unthrottle = rs_unthrottle,
1490 .set_termios = rs_set_termios,
1491 .stop = rs_stop,
1492 .start = rs_start,
1493 .hangup = rs_hangup,
1494 .break_ctl = rs_break,
1495 .send_xchar = rs_send_xchar,
1496 .wait_until_sent = rs_wait_until_sent,
1497 .tiocmget = rs_tiocmget,
1498 .tiocmset = rs_tiocmset,
1499 .get_icount = rs_get_icount,
1500 .set_serial = set_serial_info,
1501 .get_serial = get_serial_info,
1502 .proc_show = rs_proc_show,
1503};
1504
1505static int amiga_carrier_raised(struct tty_port *port)
1506{
1507 return !(ciab.pra & SER_DCD);
1508}
1509
1510static void amiga_dtr_rts(struct tty_port *port, int raise)
1511{
1512 struct serial_state *info = container_of(port, struct serial_state,
1513 tport);
1514 unsigned long flags;
1515
1516 if (raise)
1517 info->MCR |= SER_DTR|SER_RTS;
1518 else
1519 info->MCR &= ~(SER_DTR|SER_RTS);
1520
1521 local_irq_save(flags);
1522 rtsdtr_ctrl(info->MCR);
1523 local_irq_restore(flags);
1524}
1525
1526static const struct tty_port_operations amiga_port_ops = {
1527 .carrier_raised = amiga_carrier_raised,
1528 .dtr_rts = amiga_dtr_rts,
1529};
1530
1531/*
1532 * The serial driver boot-time initialization code!
1533 */
1534static int __init amiga_serial_probe(struct platform_device *pdev)
1535{
1536 unsigned long flags;
1537 struct serial_state * state;
1538 int error;
1539
1540 serial_driver = alloc_tty_driver(NR_PORTS);
1541 if (!serial_driver)
1542 return -ENOMEM;
1543
1544 show_serial_version();
1545
1546 /* Initialize the tty_driver structure */
1547
1548 serial_driver->driver_name = "amiserial";
1549 serial_driver->name = "ttyS";
1550 serial_driver->major = TTY_MAJOR;
1551 serial_driver->minor_start = 64;
1552 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1553 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1554 serial_driver->init_termios = tty_std_termios;
1555 serial_driver->init_termios.c_cflag =
1556 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1557 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1558 tty_set_operations(serial_driver, &serial_ops);
1559
1560 state = rs_table;
1561 state->port = (int)&custom.serdatr; /* Just to give it a value */
1562 state->custom_divisor = 0;
1563 state->icount.cts = state->icount.dsr =
1564 state->icount.rng = state->icount.dcd = 0;
1565 state->icount.rx = state->icount.tx = 0;
1566 state->icount.frame = state->icount.parity = 0;
1567 state->icount.overrun = state->icount.brk = 0;
1568 tty_port_init(&state->tport);
1569 state->tport.ops = &amiga_port_ops;
1570 tty_port_link_device(&state->tport, serial_driver, 0);
1571
1572 error = tty_register_driver(serial_driver);
1573 if (error)
1574 goto fail_put_tty_driver;
1575
1576 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1577
1578 /* Hardware set up */
1579
1580 state->baud_base = amiga_colorclock;
1581 state->xmit_fifo_size = 1;
1582
1583 /* set ISRs, and then disable the rx interrupts */
1584 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1585 if (error)
1586 goto fail_unregister;
1587
1588 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1589 "serial RX", state);
1590 if (error)
1591 goto fail_free_irq;
1592
1593 local_irq_save(flags);
1594
1595 /* turn off Rx and Tx interrupts */
1596 custom.intena = IF_RBF | IF_TBE;
1597 mb();
1598
1599 /* clear any pending interrupt */
1600 custom.intreq = IF_RBF | IF_TBE;
1601 mb();
1602
1603 local_irq_restore(flags);
1604
1605 /*
1606 * set the appropriate directions for the modem control flags,
1607 * and clear RTS and DTR
1608 */
1609 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1610 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1611
1612 platform_set_drvdata(pdev, state);
1613
1614 return 0;
1615
1616fail_free_irq:
1617 free_irq(IRQ_AMIGA_TBE, state);
1618fail_unregister:
1619 tty_unregister_driver(serial_driver);
1620fail_put_tty_driver:
1621 tty_port_destroy(&state->tport);
1622 put_tty_driver(serial_driver);
1623 return error;
1624}
1625
1626static int __exit amiga_serial_remove(struct platform_device *pdev)
1627{
1628 int error;
1629 struct serial_state *state = platform_get_drvdata(pdev);
1630
1631 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1632 error = tty_unregister_driver(serial_driver);
1633 if (error)
1634 printk("SERIAL: failed to unregister serial driver (%d)\n",
1635 error);
1636 put_tty_driver(serial_driver);
1637 tty_port_destroy(&state->tport);
1638
1639 free_irq(IRQ_AMIGA_TBE, state);
1640 free_irq(IRQ_AMIGA_RBF, state);
1641
1642 return error;
1643}
1644
1645static struct platform_driver amiga_serial_driver = {
1646 .remove = __exit_p(amiga_serial_remove),
1647 .driver = {
1648 .name = "amiga-serial",
1649 },
1650};
1651
1652module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1653
1654
1655#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1656
1657/*
1658 * ------------------------------------------------------------
1659 * Serial console driver
1660 * ------------------------------------------------------------
1661 */
1662
1663static void amiga_serial_putc(char c)
1664{
1665 custom.serdat = (unsigned char)c | 0x100;
1666 while (!(custom.serdatr & 0x2000))
1667 barrier();
1668}
1669
1670/*
1671 * Print a string to the serial port trying not to disturb
1672 * any possible real use of the port...
1673 *
1674 * The console must be locked when we get here.
1675 */
1676static void serial_console_write(struct console *co, const char *s,
1677 unsigned count)
1678{
1679 unsigned short intena = custom.intenar;
1680
1681 custom.intena = IF_TBE;
1682
1683 while (count--) {
1684 if (*s == '\n')
1685 amiga_serial_putc('\r');
1686 amiga_serial_putc(*s++);
1687 }
1688
1689 custom.intena = IF_SETCLR | (intena & IF_TBE);
1690}
1691
1692static struct tty_driver *serial_console_device(struct console *c, int *index)
1693{
1694 *index = 0;
1695 return serial_driver;
1696}
1697
1698static struct console sercons = {
1699 .name = "ttyS",
1700 .write = serial_console_write,
1701 .device = serial_console_device,
1702 .flags = CON_PRINTBUFFER,
1703 .index = -1,
1704};
1705
1706/*
1707 * Register console.
1708 */
1709static int __init amiserial_console_init(void)
1710{
1711 if (!MACH_IS_AMIGA)
1712 return -ENODEV;
1713
1714 register_console(&sercons);
1715 return 0;
1716}
1717console_initcall(amiserial_console_init);
1718
1719#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1720
1721MODULE_LICENSE("GPL");
1722MODULE_ALIAS("platform:amiga-serial");
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_state *state,
1000 struct serial_struct __user * retinfo)
1001{
1002 struct serial_struct tmp;
1003
1004 memset(&tmp, 0, sizeof(tmp));
1005 tty_lock(tty);
1006 tmp.line = tty->index;
1007 tmp.port = state->port;
1008 tmp.flags = state->tport.flags;
1009 tmp.xmit_fifo_size = state->xmit_fifo_size;
1010 tmp.baud_base = state->baud_base;
1011 tmp.close_delay = state->tport.close_delay;
1012 tmp.closing_wait = state->tport.closing_wait;
1013 tmp.custom_divisor = state->custom_divisor;
1014 tty_unlock(tty);
1015 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1016 return -EFAULT;
1017 return 0;
1018}
1019
1020static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
1021 struct serial_struct __user * new_info)
1022{
1023 struct tty_port *port = &state->tport;
1024 struct serial_struct new_serial;
1025 bool change_spd;
1026 int retval = 0;
1027
1028 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1029 return -EFAULT;
1030
1031 tty_lock(tty);
1032 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
1033 new_serial.custom_divisor != state->custom_divisor;
1034 if (new_serial.irq || new_serial.port != state->port ||
1035 new_serial.xmit_fifo_size != state->xmit_fifo_size) {
1036 tty_unlock(tty);
1037 return -EINVAL;
1038 }
1039
1040 if (!serial_isroot()) {
1041 if ((new_serial.baud_base != state->baud_base) ||
1042 (new_serial.close_delay != port->close_delay) ||
1043 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1044 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1045 (port->flags & ~ASYNC_USR_MASK))) {
1046 tty_unlock(tty);
1047 return -EPERM;
1048 }
1049 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1050 (new_serial.flags & ASYNC_USR_MASK));
1051 state->custom_divisor = new_serial.custom_divisor;
1052 goto check_and_exit;
1053 }
1054
1055 if (new_serial.baud_base < 9600) {
1056 tty_unlock(tty);
1057 return -EINVAL;
1058 }
1059
1060 /*
1061 * OK, past this point, all the error checking has been done.
1062 * At this point, we start making changes.....
1063 */
1064
1065 state->baud_base = new_serial.baud_base;
1066 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1067 (new_serial.flags & ASYNC_FLAGS));
1068 state->custom_divisor = new_serial.custom_divisor;
1069 port->close_delay = new_serial.close_delay * HZ/100;
1070 port->closing_wait = new_serial.closing_wait * HZ/100;
1071 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1072
1073check_and_exit:
1074 if (tty_port_initialized(port)) {
1075 if (change_spd) {
1076 /* warn about deprecation unless clearing */
1077 if (new_serial.flags & ASYNC_SPD_MASK)
1078 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
1079 change_speed(tty, state, NULL);
1080 }
1081 } else
1082 retval = startup(tty, state);
1083 tty_unlock(tty);
1084 return retval;
1085}
1086
1087
1088/*
1089 * get_lsr_info - get line status register info
1090 *
1091 * Purpose: Let user call ioctl() to get info when the UART physically
1092 * is emptied. On bus types like RS485, the transmitter must
1093 * release the bus after transmitting. This must be done when
1094 * the transmit shift register is empty, not be done when the
1095 * transmit holding register is empty. This functionality
1096 * allows an RS485 driver to be written in user space.
1097 */
1098static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1099{
1100 unsigned char status;
1101 unsigned int result;
1102 unsigned long flags;
1103
1104 local_irq_save(flags);
1105 status = custom.serdatr;
1106 mb();
1107 local_irq_restore(flags);
1108 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1109 if (copy_to_user(value, &result, sizeof(int)))
1110 return -EFAULT;
1111 return 0;
1112}
1113
1114
1115static int rs_tiocmget(struct tty_struct *tty)
1116{
1117 struct serial_state *info = tty->driver_data;
1118 unsigned char control, status;
1119 unsigned long flags;
1120
1121 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1122 return -ENODEV;
1123 if (tty_io_error(tty))
1124 return -EIO;
1125
1126 control = info->MCR;
1127 local_irq_save(flags);
1128 status = ciab.pra;
1129 local_irq_restore(flags);
1130 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1131 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1132 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1133 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1134 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1135}
1136
1137static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1138 unsigned int clear)
1139{
1140 struct serial_state *info = tty->driver_data;
1141 unsigned long flags;
1142
1143 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1144 return -ENODEV;
1145 if (tty_io_error(tty))
1146 return -EIO;
1147
1148 local_irq_save(flags);
1149 if (set & TIOCM_RTS)
1150 info->MCR |= SER_RTS;
1151 if (set & TIOCM_DTR)
1152 info->MCR |= SER_DTR;
1153 if (clear & TIOCM_RTS)
1154 info->MCR &= ~SER_RTS;
1155 if (clear & TIOCM_DTR)
1156 info->MCR &= ~SER_DTR;
1157 rtsdtr_ctrl(info->MCR);
1158 local_irq_restore(flags);
1159 return 0;
1160}
1161
1162/*
1163 * rs_break() --- routine which turns the break handling on or off
1164 */
1165static int rs_break(struct tty_struct *tty, int break_state)
1166{
1167 struct serial_state *info = tty->driver_data;
1168 unsigned long flags;
1169
1170 if (serial_paranoia_check(info, tty->name, "rs_break"))
1171 return -EINVAL;
1172
1173 local_irq_save(flags);
1174 if (break_state == -1)
1175 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1176 else
1177 custom.adkcon = AC_UARTBRK;
1178 mb();
1179 local_irq_restore(flags);
1180 return 0;
1181}
1182
1183/*
1184 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1185 * Return: write counters to the user passed counter struct
1186 * NB: both 1->0 and 0->1 transitions are counted except for
1187 * RI where only 0->1 is counted.
1188 */
1189static int rs_get_icount(struct tty_struct *tty,
1190 struct serial_icounter_struct *icount)
1191{
1192 struct serial_state *info = tty->driver_data;
1193 struct async_icount cnow;
1194 unsigned long flags;
1195
1196 local_irq_save(flags);
1197 cnow = info->icount;
1198 local_irq_restore(flags);
1199 icount->cts = cnow.cts;
1200 icount->dsr = cnow.dsr;
1201 icount->rng = cnow.rng;
1202 icount->dcd = cnow.dcd;
1203 icount->rx = cnow.rx;
1204 icount->tx = cnow.tx;
1205 icount->frame = cnow.frame;
1206 icount->overrun = cnow.overrun;
1207 icount->parity = cnow.parity;
1208 icount->brk = cnow.brk;
1209 icount->buf_overrun = cnow.buf_overrun;
1210
1211 return 0;
1212}
1213
1214static int rs_ioctl(struct tty_struct *tty,
1215 unsigned int cmd, unsigned long arg)
1216{
1217 struct serial_state *info = tty->driver_data;
1218 struct async_icount cprev, cnow; /* kernel counter temps */
1219 void __user *argp = (void __user *)arg;
1220 unsigned long flags;
1221 DEFINE_WAIT(wait);
1222 int ret;
1223
1224 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1225 return -ENODEV;
1226
1227 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1228 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1229 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1230 if (tty_io_error(tty))
1231 return -EIO;
1232 }
1233
1234 switch (cmd) {
1235 case TIOCGSERIAL:
1236 return get_serial_info(tty, info, argp);
1237 case TIOCSSERIAL:
1238 return set_serial_info(tty, info, argp);
1239 case TIOCSERCONFIG:
1240 return 0;
1241
1242 case TIOCSERGETLSR: /* Get line status register */
1243 return get_lsr_info(info, argp);
1244
1245 case TIOCSERGSTRUCT:
1246 if (copy_to_user(argp,
1247 info, sizeof(struct serial_state)))
1248 return -EFAULT;
1249 return 0;
1250
1251 /*
1252 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1253 * - mask passed in arg for lines of interest
1254 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1255 * Caller should use TIOCGICOUNT to see which one it was
1256 */
1257 case TIOCMIWAIT:
1258 local_irq_save(flags);
1259 /* note the counters on entry */
1260 cprev = info->icount;
1261 local_irq_restore(flags);
1262 while (1) {
1263 prepare_to_wait(&info->tport.delta_msr_wait,
1264 &wait, TASK_INTERRUPTIBLE);
1265 local_irq_save(flags);
1266 cnow = info->icount; /* atomic copy */
1267 local_irq_restore(flags);
1268 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1269 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1270 ret = -EIO; /* no change => error */
1271 break;
1272 }
1273 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1274 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1275 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1276 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1277 ret = 0;
1278 break;
1279 }
1280 schedule();
1281 /* see if a signal did it */
1282 if (signal_pending(current)) {
1283 ret = -ERESTARTSYS;
1284 break;
1285 }
1286 cprev = cnow;
1287 }
1288 finish_wait(&info->tport.delta_msr_wait, &wait);
1289 return ret;
1290
1291 case TIOCSERGWILD:
1292 case TIOCSERSWILD:
1293 /* "setserial -W" is called in Debian boot */
1294 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1295 return 0;
1296
1297 default:
1298 return -ENOIOCTLCMD;
1299 }
1300 return 0;
1301}
1302
1303static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1304{
1305 struct serial_state *info = tty->driver_data;
1306 unsigned long flags;
1307 unsigned int cflag = tty->termios.c_cflag;
1308
1309 change_speed(tty, info, old_termios);
1310
1311 /* Handle transition to B0 status */
1312 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1313 info->MCR &= ~(SER_DTR|SER_RTS);
1314 local_irq_save(flags);
1315 rtsdtr_ctrl(info->MCR);
1316 local_irq_restore(flags);
1317 }
1318
1319 /* Handle transition away from B0 status */
1320 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1321 info->MCR |= SER_DTR;
1322 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1323 info->MCR |= SER_RTS;
1324 local_irq_save(flags);
1325 rtsdtr_ctrl(info->MCR);
1326 local_irq_restore(flags);
1327 }
1328
1329 /* Handle turning off CRTSCTS */
1330 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1331 tty->hw_stopped = 0;
1332 rs_start(tty);
1333 }
1334
1335#if 0
1336 /*
1337 * No need to wake up processes in open wait, since they
1338 * sample the CLOCAL flag once, and don't recheck it.
1339 * XXX It's not clear whether the current behavior is correct
1340 * or not. Hence, this may change.....
1341 */
1342 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1343 wake_up_interruptible(&info->open_wait);
1344#endif
1345}
1346
1347/*
1348 * ------------------------------------------------------------
1349 * rs_close()
1350 *
1351 * This routine is called when the serial port gets closed. First, we
1352 * wait for the last remaining data to be sent. Then, we unlink its
1353 * async structure from the interrupt chain if necessary, and we free
1354 * that IRQ if nothing is left in the chain.
1355 * ------------------------------------------------------------
1356 */
1357static void rs_close(struct tty_struct *tty, struct file * filp)
1358{
1359 struct serial_state *state = tty->driver_data;
1360 struct tty_port *port = &state->tport;
1361
1362 if (serial_paranoia_check(state, tty->name, "rs_close"))
1363 return;
1364
1365 if (tty_port_close_start(port, tty, filp) == 0)
1366 return;
1367
1368 /*
1369 * At this point we stop accepting input. To do this, we
1370 * disable the receive line status interrupts, and tell the
1371 * interrupt driver to stop checking the data ready bit in the
1372 * line status register.
1373 */
1374 state->read_status_mask &= ~UART_LSR_DR;
1375 if (tty_port_initialized(port)) {
1376 /* disable receive interrupts */
1377 custom.intena = IF_RBF;
1378 mb();
1379 /* clear any pending receive interrupt */
1380 custom.intreq = IF_RBF;
1381 mb();
1382
1383 /*
1384 * Before we drop DTR, make sure the UART transmitter
1385 * has completely drained; this is especially
1386 * important if there is a transmit FIFO!
1387 */
1388 rs_wait_until_sent(tty, state->timeout);
1389 }
1390 shutdown(tty, state);
1391 rs_flush_buffer(tty);
1392
1393 tty_ldisc_flush(tty);
1394 port->tty = NULL;
1395
1396 tty_port_close_end(port, tty);
1397}
1398
1399/*
1400 * rs_wait_until_sent() --- wait until the transmitter is empty
1401 */
1402static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1403{
1404 struct serial_state *info = tty->driver_data;
1405 unsigned long orig_jiffies, char_time;
1406 int lsr;
1407
1408 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1409 return;
1410
1411 if (info->xmit_fifo_size == 0)
1412 return; /* Just in case.... */
1413
1414 orig_jiffies = jiffies;
1415
1416 /*
1417 * Set the check interval to be 1/5 of the estimated time to
1418 * send a single character, and make it at least 1. The check
1419 * interval should also be less than the timeout.
1420 *
1421 * Note: we have to use pretty tight timings here to satisfy
1422 * the NIST-PCTS.
1423 */
1424 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1425 char_time = char_time / 5;
1426 if (char_time == 0)
1427 char_time = 1;
1428 if (timeout)
1429 char_time = min_t(unsigned long, char_time, timeout);
1430 /*
1431 * If the transmitter hasn't cleared in twice the approximate
1432 * amount of time to send the entire FIFO, it probably won't
1433 * ever clear. This assumes the UART isn't doing flow
1434 * control, which is currently the case. Hence, if it ever
1435 * takes longer than info->timeout, this is probably due to a
1436 * UART bug of some kind. So, we clamp the timeout parameter at
1437 * 2*info->timeout.
1438 */
1439 if (!timeout || timeout > 2*info->timeout)
1440 timeout = 2*info->timeout;
1441#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1442 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1443 printk("jiff=%lu...", jiffies);
1444#endif
1445 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1446#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1447 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1448#endif
1449 msleep_interruptible(jiffies_to_msecs(char_time));
1450 if (signal_pending(current))
1451 break;
1452 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1453 break;
1454 }
1455 __set_current_state(TASK_RUNNING);
1456
1457#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1458 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1459#endif
1460}
1461
1462/*
1463 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1464 */
1465static void rs_hangup(struct tty_struct *tty)
1466{
1467 struct serial_state *info = tty->driver_data;
1468
1469 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1470 return;
1471
1472 rs_flush_buffer(tty);
1473 shutdown(tty, info);
1474 info->tport.count = 0;
1475 tty_port_set_active(&info->tport, 0);
1476 info->tport.tty = NULL;
1477 wake_up_interruptible(&info->tport.open_wait);
1478}
1479
1480/*
1481 * This routine is called whenever a serial port is opened. It
1482 * enables interrupts for a serial port, linking in its async structure into
1483 * the IRQ chain. It also performs the serial-specific
1484 * initialization for the tty structure.
1485 */
1486static int rs_open(struct tty_struct *tty, struct file * filp)
1487{
1488 struct serial_state *info = rs_table + tty->index;
1489 struct tty_port *port = &info->tport;
1490 int retval;
1491
1492 port->count++;
1493 port->tty = tty;
1494 tty->driver_data = info;
1495 tty->port = port;
1496 if (serial_paranoia_check(info, tty->name, "rs_open"))
1497 return -ENODEV;
1498
1499 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1500
1501 retval = startup(tty, info);
1502 if (retval) {
1503 return retval;
1504 }
1505
1506 return tty_port_block_til_ready(port, tty, filp);
1507}
1508
1509/*
1510 * /proc fs routines....
1511 */
1512
1513static inline void line_info(struct seq_file *m, int line,
1514 struct serial_state *state)
1515{
1516 char stat_buf[30], control, status;
1517 unsigned long flags;
1518
1519 seq_printf(m, "%d: uart:amiga_builtin", line);
1520
1521 local_irq_save(flags);
1522 status = ciab.pra;
1523 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1524 local_irq_restore(flags);
1525
1526 stat_buf[0] = 0;
1527 stat_buf[1] = 0;
1528 if(!(control & SER_RTS))
1529 strcat(stat_buf, "|RTS");
1530 if(!(status & SER_CTS))
1531 strcat(stat_buf, "|CTS");
1532 if(!(control & SER_DTR))
1533 strcat(stat_buf, "|DTR");
1534 if(!(status & SER_DSR))
1535 strcat(stat_buf, "|DSR");
1536 if(!(status & SER_DCD))
1537 strcat(stat_buf, "|CD");
1538
1539 if (state->quot)
1540 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1541
1542 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1543
1544 if (state->icount.frame)
1545 seq_printf(m, " fe:%d", state->icount.frame);
1546
1547 if (state->icount.parity)
1548 seq_printf(m, " pe:%d", state->icount.parity);
1549
1550 if (state->icount.brk)
1551 seq_printf(m, " brk:%d", state->icount.brk);
1552
1553 if (state->icount.overrun)
1554 seq_printf(m, " oe:%d", state->icount.overrun);
1555
1556 /*
1557 * Last thing is the RS-232 status lines
1558 */
1559 seq_printf(m, " %s\n", stat_buf+1);
1560}
1561
1562static int rs_proc_show(struct seq_file *m, void *v)
1563{
1564 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1565 line_info(m, 0, &rs_table[0]);
1566 return 0;
1567}
1568
1569static int rs_proc_open(struct inode *inode, struct file *file)
1570{
1571 return single_open(file, rs_proc_show, NULL);
1572}
1573
1574static const struct file_operations rs_proc_fops = {
1575 .owner = THIS_MODULE,
1576 .open = rs_proc_open,
1577 .read = seq_read,
1578 .llseek = seq_lseek,
1579 .release = single_release,
1580};
1581
1582/*
1583 * ---------------------------------------------------------------------
1584 * rs_init() and friends
1585 *
1586 * rs_init() is called at boot-time to initialize the serial driver.
1587 * ---------------------------------------------------------------------
1588 */
1589
1590/*
1591 * This routine prints out the appropriate serial driver version
1592 * number, and identifies which options were configured into this
1593 * driver.
1594 */
1595static void show_serial_version(void)
1596{
1597 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1598}
1599
1600
1601static const struct tty_operations serial_ops = {
1602 .open = rs_open,
1603 .close = rs_close,
1604 .write = rs_write,
1605 .put_char = rs_put_char,
1606 .flush_chars = rs_flush_chars,
1607 .write_room = rs_write_room,
1608 .chars_in_buffer = rs_chars_in_buffer,
1609 .flush_buffer = rs_flush_buffer,
1610 .ioctl = rs_ioctl,
1611 .throttle = rs_throttle,
1612 .unthrottle = rs_unthrottle,
1613 .set_termios = rs_set_termios,
1614 .stop = rs_stop,
1615 .start = rs_start,
1616 .hangup = rs_hangup,
1617 .break_ctl = rs_break,
1618 .send_xchar = rs_send_xchar,
1619 .wait_until_sent = rs_wait_until_sent,
1620 .tiocmget = rs_tiocmget,
1621 .tiocmset = rs_tiocmset,
1622 .get_icount = rs_get_icount,
1623 .proc_fops = &rs_proc_fops,
1624};
1625
1626static int amiga_carrier_raised(struct tty_port *port)
1627{
1628 return !(ciab.pra & SER_DCD);
1629}
1630
1631static void amiga_dtr_rts(struct tty_port *port, int raise)
1632{
1633 struct serial_state *info = container_of(port, struct serial_state,
1634 tport);
1635 unsigned long flags;
1636
1637 if (raise)
1638 info->MCR |= SER_DTR|SER_RTS;
1639 else
1640 info->MCR &= ~(SER_DTR|SER_RTS);
1641
1642 local_irq_save(flags);
1643 rtsdtr_ctrl(info->MCR);
1644 local_irq_restore(flags);
1645}
1646
1647static const struct tty_port_operations amiga_port_ops = {
1648 .carrier_raised = amiga_carrier_raised,
1649 .dtr_rts = amiga_dtr_rts,
1650};
1651
1652/*
1653 * The serial driver boot-time initialization code!
1654 */
1655static int __init amiga_serial_probe(struct platform_device *pdev)
1656{
1657 unsigned long flags;
1658 struct serial_state * state;
1659 int error;
1660
1661 serial_driver = alloc_tty_driver(NR_PORTS);
1662 if (!serial_driver)
1663 return -ENOMEM;
1664
1665 show_serial_version();
1666
1667 /* Initialize the tty_driver structure */
1668
1669 serial_driver->driver_name = "amiserial";
1670 serial_driver->name = "ttyS";
1671 serial_driver->major = TTY_MAJOR;
1672 serial_driver->minor_start = 64;
1673 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1674 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1675 serial_driver->init_termios = tty_std_termios;
1676 serial_driver->init_termios.c_cflag =
1677 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1678 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1679 tty_set_operations(serial_driver, &serial_ops);
1680
1681 state = rs_table;
1682 state->port = (int)&custom.serdatr; /* Just to give it a value */
1683 state->custom_divisor = 0;
1684 state->icount.cts = state->icount.dsr =
1685 state->icount.rng = state->icount.dcd = 0;
1686 state->icount.rx = state->icount.tx = 0;
1687 state->icount.frame = state->icount.parity = 0;
1688 state->icount.overrun = state->icount.brk = 0;
1689 tty_port_init(&state->tport);
1690 state->tport.ops = &amiga_port_ops;
1691 tty_port_link_device(&state->tport, serial_driver, 0);
1692
1693 error = tty_register_driver(serial_driver);
1694 if (error)
1695 goto fail_put_tty_driver;
1696
1697 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1698
1699 /* Hardware set up */
1700
1701 state->baud_base = amiga_colorclock;
1702 state->xmit_fifo_size = 1;
1703
1704 /* set ISRs, and then disable the rx interrupts */
1705 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1706 if (error)
1707 goto fail_unregister;
1708
1709 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1710 "serial RX", state);
1711 if (error)
1712 goto fail_free_irq;
1713
1714 local_irq_save(flags);
1715
1716 /* turn off Rx and Tx interrupts */
1717 custom.intena = IF_RBF | IF_TBE;
1718 mb();
1719
1720 /* clear any pending interrupt */
1721 custom.intreq = IF_RBF | IF_TBE;
1722 mb();
1723
1724 local_irq_restore(flags);
1725
1726 /*
1727 * set the appropriate directions for the modem control flags,
1728 * and clear RTS and DTR
1729 */
1730 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1731 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1732
1733 platform_set_drvdata(pdev, state);
1734
1735 return 0;
1736
1737fail_free_irq:
1738 free_irq(IRQ_AMIGA_TBE, state);
1739fail_unregister:
1740 tty_unregister_driver(serial_driver);
1741fail_put_tty_driver:
1742 tty_port_destroy(&state->tport);
1743 put_tty_driver(serial_driver);
1744 return error;
1745}
1746
1747static int __exit amiga_serial_remove(struct platform_device *pdev)
1748{
1749 int error;
1750 struct serial_state *state = platform_get_drvdata(pdev);
1751
1752 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1753 error = tty_unregister_driver(serial_driver);
1754 if (error)
1755 printk("SERIAL: failed to unregister serial driver (%d)\n",
1756 error);
1757 put_tty_driver(serial_driver);
1758 tty_port_destroy(&state->tport);
1759
1760 free_irq(IRQ_AMIGA_TBE, state);
1761 free_irq(IRQ_AMIGA_RBF, state);
1762
1763 return error;
1764}
1765
1766static struct platform_driver amiga_serial_driver = {
1767 .remove = __exit_p(amiga_serial_remove),
1768 .driver = {
1769 .name = "amiga-serial",
1770 },
1771};
1772
1773module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1774
1775
1776#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1777
1778/*
1779 * ------------------------------------------------------------
1780 * Serial console driver
1781 * ------------------------------------------------------------
1782 */
1783
1784static void amiga_serial_putc(char c)
1785{
1786 custom.serdat = (unsigned char)c | 0x100;
1787 while (!(custom.serdatr & 0x2000))
1788 barrier();
1789}
1790
1791/*
1792 * Print a string to the serial port trying not to disturb
1793 * any possible real use of the port...
1794 *
1795 * The console must be locked when we get here.
1796 */
1797static void serial_console_write(struct console *co, const char *s,
1798 unsigned count)
1799{
1800 unsigned short intena = custom.intenar;
1801
1802 custom.intena = IF_TBE;
1803
1804 while (count--) {
1805 if (*s == '\n')
1806 amiga_serial_putc('\r');
1807 amiga_serial_putc(*s++);
1808 }
1809
1810 custom.intena = IF_SETCLR | (intena & IF_TBE);
1811}
1812
1813static struct tty_driver *serial_console_device(struct console *c, int *index)
1814{
1815 *index = 0;
1816 return serial_driver;
1817}
1818
1819static struct console sercons = {
1820 .name = "ttyS",
1821 .write = serial_console_write,
1822 .device = serial_console_device,
1823 .flags = CON_PRINTBUFFER,
1824 .index = -1,
1825};
1826
1827/*
1828 * Register console.
1829 */
1830static int __init amiserial_console_init(void)
1831{
1832 if (!MACH_IS_AMIGA)
1833 return -ENODEV;
1834
1835 register_console(&sercons);
1836 return 0;
1837}
1838console_initcall(amiserial_console_init);
1839
1840#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1841
1842MODULE_LICENSE("GPL");
1843MODULE_ALIAS("platform:amiga-serial");