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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/*
2 * Serial driver for the amiga builtin port.
3 *
4 * This code was created by taking serial.c version 4.30 from kernel
5 * release 2.3.22, replacing all hardware related stuff with the
6 * corresponding amiga hardware actions, and removing all irrelevant
7 * code. As a consequence, it uses many of the constants and names
8 * associated with the registers and bits of 16550 compatible UARTS -
9 * but only to keep track of status, etc in the state variables. It
10 * was done this was to make it easier to keep the code in line with
11 * (non hardware specific) changes to serial.c.
12 *
13 * The port is registered with the tty driver as minor device 64, and
14 * therefore other ports should should only use 65 upwards.
15 *
16 * Richard Lucock 28/12/99
17 *
18 * Copyright (C) 1991, 1992 Linus Torvalds
19 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
20 * 1998, 1999 Theodore Ts'o
21 *
22 */
23
24/*
25 * Serial driver configuration section. Here are the various options:
26 *
27 * SERIAL_PARANOIA_CHECK
28 * Check the magic number for the async_structure where
29 * ever possible.
30 */
31
32#include <linux/delay.h>
33
34#undef SERIAL_PARANOIA_CHECK
35#define SERIAL_DO_RESTART
36
37/* Set of debugging defines */
38
39#undef SERIAL_DEBUG_INTR
40#undef SERIAL_DEBUG_OPEN
41#undef SERIAL_DEBUG_FLOW
42#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
43
44/* Sanity checks */
45
46#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
47#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
48 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
49#else
50#define DBG_CNT(s)
51#endif
52
53/*
54 * End of serial driver configuration section.
55 */
56
57#include <linux/module.h>
58
59#include <linux/types.h>
60#include <linux/serial.h>
61#include <linux/serial_reg.h>
62static char *serial_version = "4.30";
63
64#include <linux/errno.h>
65#include <linux/signal.h>
66#include <linux/sched.h>
67#include <linux/kernel.h>
68#include <linux/timer.h>
69#include <linux/interrupt.h>
70#include <linux/tty.h>
71#include <linux/tty_flip.h>
72#include <linux/circ_buf.h>
73#include <linux/console.h>
74#include <linux/major.h>
75#include <linux/string.h>
76#include <linux/fcntl.h>
77#include <linux/ptrace.h>
78#include <linux/ioport.h>
79#include <linux/mm.h>
80#include <linux/seq_file.h>
81#include <linux/slab.h>
82#include <linux/init.h>
83#include <linux/bitops.h>
84#include <linux/platform_device.h>
85
86#include <asm/setup.h>
87
88
89#include <asm/irq.h>
90
91#include <asm/amigahw.h>
92#include <asm/amigaints.h>
93
94struct serial_state {
95 struct tty_port tport;
96 struct circ_buf xmit;
97 struct async_icount icount;
98
99 unsigned long port;
100 int baud_base;
101 int xmit_fifo_size;
102 int custom_divisor;
103 int read_status_mask;
104 int ignore_status_mask;
105 int timeout;
106 int quot;
107 int IER; /* Interrupt Enable Register */
108 int MCR; /* Modem control register */
109 int x_char; /* xon/xoff character */
110};
111
112#define custom amiga_custom
113static char *serial_name = "Amiga-builtin serial driver";
114
115static struct tty_driver *serial_driver;
116
117/* number of characters left in xmit buffer before we ask for more */
118#define WAKEUP_CHARS 256
119
120static unsigned char current_ctl_bits;
121
122static void change_speed(struct tty_struct *tty, struct serial_state *info,
123 struct ktermios *old);
124static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
125
126
127static struct serial_state rs_table[1];
128
129#define NR_PORTS ARRAY_SIZE(rs_table)
130
131#include <asm/uaccess.h>
132
133#define serial_isroot() (capable(CAP_SYS_ADMIN))
134
135
136static inline int serial_paranoia_check(struct serial_state *info,
137 char *name, const char *routine)
138{
139#ifdef SERIAL_PARANOIA_CHECK
140 static const char *badmagic =
141 "Warning: bad magic number for serial struct (%s) in %s\n";
142 static const char *badinfo =
143 "Warning: null async_struct for (%s) in %s\n";
144
145 if (!info) {
146 printk(badinfo, name, routine);
147 return 1;
148 }
149 if (info->magic != SERIAL_MAGIC) {
150 printk(badmagic, name, routine);
151 return 1;
152 }
153#endif
154 return 0;
155}
156
157/* some serial hardware definitions */
158#define SDR_OVRUN (1<<15)
159#define SDR_RBF (1<<14)
160#define SDR_TBE (1<<13)
161#define SDR_TSRE (1<<12)
162
163#define SERPER_PARENB (1<<15)
164
165#define AC_SETCLR (1<<15)
166#define AC_UARTBRK (1<<11)
167
168#define SER_DTR (1<<7)
169#define SER_RTS (1<<6)
170#define SER_DCD (1<<5)
171#define SER_CTS (1<<4)
172#define SER_DSR (1<<3)
173
174static __inline__ void rtsdtr_ctrl(int bits)
175{
176 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
177}
178
179/*
180 * ------------------------------------------------------------
181 * rs_stop() and rs_start()
182 *
183 * This routines are called before setting or resetting tty->stopped.
184 * They enable or disable transmitter interrupts, as necessary.
185 * ------------------------------------------------------------
186 */
187static void rs_stop(struct tty_struct *tty)
188{
189 struct serial_state *info = tty->driver_data;
190 unsigned long flags;
191
192 if (serial_paranoia_check(info, tty->name, "rs_stop"))
193 return;
194
195 local_irq_save(flags);
196 if (info->IER & UART_IER_THRI) {
197 info->IER &= ~UART_IER_THRI;
198 /* disable Tx interrupt and remove any pending interrupts */
199 custom.intena = IF_TBE;
200 mb();
201 custom.intreq = IF_TBE;
202 mb();
203 }
204 local_irq_restore(flags);
205}
206
207static void rs_start(struct tty_struct *tty)
208{
209 struct serial_state *info = tty->driver_data;
210 unsigned long flags;
211
212 if (serial_paranoia_check(info, tty->name, "rs_start"))
213 return;
214
215 local_irq_save(flags);
216 if (info->xmit.head != info->xmit.tail
217 && info->xmit.buf
218 && !(info->IER & UART_IER_THRI)) {
219 info->IER |= UART_IER_THRI;
220 custom.intena = IF_SETCLR | IF_TBE;
221 mb();
222 /* set a pending Tx Interrupt, transmitter should restart now */
223 custom.intreq = IF_SETCLR | IF_TBE;
224 mb();
225 }
226 local_irq_restore(flags);
227}
228
229/*
230 * ----------------------------------------------------------------------
231 *
232 * Here starts the interrupt handling routines. All of the following
233 * subroutines are declared as inline and are folded into
234 * rs_interrupt(). They were separated out for readability's sake.
235 *
236 * Note: rs_interrupt() is a "fast" interrupt, which means that it
237 * runs with interrupts turned off. People who may want to modify
238 * rs_interrupt() should try to keep the interrupt handler as fast as
239 * possible. After you are done making modifications, it is not a bad
240 * idea to do:
241 *
242 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
243 *
244 * and look at the resulting assemble code in serial.s.
245 *
246 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
247 * -----------------------------------------------------------------------
248 */
249
250static void receive_chars(struct serial_state *info)
251{
252 int status;
253 int serdatr;
254 struct tty_struct *tty = info->tport.tty;
255 unsigned char ch, flag;
256 struct async_icount *icount;
257 int oe = 0;
258
259 icount = &info->icount;
260
261 status = UART_LSR_DR; /* We obviously have a character! */
262 serdatr = custom.serdatr;
263 mb();
264 custom.intreq = IF_RBF;
265 mb();
266
267 if((serdatr & 0x1ff) == 0)
268 status |= UART_LSR_BI;
269 if(serdatr & SDR_OVRUN)
270 status |= UART_LSR_OE;
271
272 ch = serdatr & 0xff;
273 icount->rx++;
274
275#ifdef SERIAL_DEBUG_INTR
276 printk("DR%02x:%02x...", ch, status);
277#endif
278 flag = TTY_NORMAL;
279
280 /*
281 * We don't handle parity or frame errors - but I have left
282 * the code in, since I'm not sure that the errors can't be
283 * detected.
284 */
285
286 if (status & (UART_LSR_BI | UART_LSR_PE |
287 UART_LSR_FE | UART_LSR_OE)) {
288 /*
289 * For statistics only
290 */
291 if (status & UART_LSR_BI) {
292 status &= ~(UART_LSR_FE | UART_LSR_PE);
293 icount->brk++;
294 } else if (status & UART_LSR_PE)
295 icount->parity++;
296 else if (status & UART_LSR_FE)
297 icount->frame++;
298 if (status & UART_LSR_OE)
299 icount->overrun++;
300
301 /*
302 * Now check to see if character should be
303 * ignored, and mask off conditions which
304 * should be ignored.
305 */
306 if (status & info->ignore_status_mask)
307 goto out;
308
309 status &= info->read_status_mask;
310
311 if (status & (UART_LSR_BI)) {
312#ifdef SERIAL_DEBUG_INTR
313 printk("handling break....");
314#endif
315 flag = TTY_BREAK;
316 if (info->tport.flags & ASYNC_SAK)
317 do_SAK(tty);
318 } else if (status & UART_LSR_PE)
319 flag = TTY_PARITY;
320 else if (status & UART_LSR_FE)
321 flag = TTY_FRAME;
322 if (status & UART_LSR_OE) {
323 /*
324 * Overrun is special, since it's
325 * reported immediately, and doesn't
326 * affect the current character
327 */
328 oe = 1;
329 }
330 }
331 tty_insert_flip_char(tty, ch, flag);
332 if (oe == 1)
333 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
334 tty_flip_buffer_push(tty);
335out:
336 return;
337}
338
339static void transmit_chars(struct serial_state *info)
340{
341 custom.intreq = IF_TBE;
342 mb();
343 if (info->x_char) {
344 custom.serdat = info->x_char | 0x100;
345 mb();
346 info->icount.tx++;
347 info->x_char = 0;
348 return;
349 }
350 if (info->xmit.head == info->xmit.tail
351 || info->tport.tty->stopped
352 || info->tport.tty->hw_stopped) {
353 info->IER &= ~UART_IER_THRI;
354 custom.intena = IF_TBE;
355 mb();
356 return;
357 }
358
359 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
360 mb();
361 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
362 info->icount.tx++;
363
364 if (CIRC_CNT(info->xmit.head,
365 info->xmit.tail,
366 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
367 tty_wakeup(info->tport.tty);
368
369#ifdef SERIAL_DEBUG_INTR
370 printk("THRE...");
371#endif
372 if (info->xmit.head == info->xmit.tail) {
373 custom.intena = IF_TBE;
374 mb();
375 info->IER &= ~UART_IER_THRI;
376 }
377}
378
379static void check_modem_status(struct serial_state *info)
380{
381 struct tty_port *port = &info->tport;
382 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
383 unsigned char dstatus;
384 struct async_icount *icount;
385
386 /* Determine bits that have changed */
387 dstatus = status ^ current_ctl_bits;
388 current_ctl_bits = status;
389
390 if (dstatus) {
391 icount = &info->icount;
392 /* update input line counters */
393 if (dstatus & SER_DSR)
394 icount->dsr++;
395 if (dstatus & SER_DCD) {
396 icount->dcd++;
397#ifdef CONFIG_HARD_PPS
398 if ((port->flags & ASYNC_HARDPPS_CD) &&
399 !(status & SER_DCD))
400 hardpps();
401#endif
402 }
403 if (dstatus & SER_CTS)
404 icount->cts++;
405 wake_up_interruptible(&port->delta_msr_wait);
406 }
407
408 if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
409#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
410 printk("ttyS%d CD now %s...", info->line,
411 (!(status & SER_DCD)) ? "on" : "off");
412#endif
413 if (!(status & SER_DCD))
414 wake_up_interruptible(&port->open_wait);
415 else {
416#ifdef SERIAL_DEBUG_OPEN
417 printk("doing serial hangup...");
418#endif
419 if (port->tty)
420 tty_hangup(port->tty);
421 }
422 }
423 if (port->flags & ASYNC_CTS_FLOW) {
424 if (port->tty->hw_stopped) {
425 if (!(status & SER_CTS)) {
426#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
427 printk("CTS tx start...");
428#endif
429 port->tty->hw_stopped = 0;
430 info->IER |= UART_IER_THRI;
431 custom.intena = IF_SETCLR | IF_TBE;
432 mb();
433 /* set a pending Tx Interrupt, transmitter should restart now */
434 custom.intreq = IF_SETCLR | IF_TBE;
435 mb();
436 tty_wakeup(port->tty);
437 return;
438 }
439 } else {
440 if ((status & SER_CTS)) {
441#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
442 printk("CTS tx stop...");
443#endif
444 port->tty->hw_stopped = 1;
445 info->IER &= ~UART_IER_THRI;
446 /* disable Tx interrupt and remove any pending interrupts */
447 custom.intena = IF_TBE;
448 mb();
449 custom.intreq = IF_TBE;
450 mb();
451 }
452 }
453 }
454}
455
456static irqreturn_t ser_vbl_int( int irq, void *data)
457{
458 /* vbl is just a periodic interrupt we tie into to update modem status */
459 struct serial_state *info = data;
460 /*
461 * TBD - is it better to unregister from this interrupt or to
462 * ignore it if MSI is clear ?
463 */
464 if(info->IER & UART_IER_MSI)
465 check_modem_status(info);
466 return IRQ_HANDLED;
467}
468
469static irqreturn_t ser_rx_int(int irq, void *dev_id)
470{
471 struct serial_state *info = dev_id;
472
473#ifdef SERIAL_DEBUG_INTR
474 printk("ser_rx_int...");
475#endif
476
477 if (!info->tport.tty)
478 return IRQ_NONE;
479
480 receive_chars(info);
481#ifdef SERIAL_DEBUG_INTR
482 printk("end.\n");
483#endif
484 return IRQ_HANDLED;
485}
486
487static irqreturn_t ser_tx_int(int irq, void *dev_id)
488{
489 struct serial_state *info = dev_id;
490
491 if (custom.serdatr & SDR_TBE) {
492#ifdef SERIAL_DEBUG_INTR
493 printk("ser_tx_int...");
494#endif
495
496 if (!info->tport.tty)
497 return IRQ_NONE;
498
499 transmit_chars(info);
500#ifdef SERIAL_DEBUG_INTR
501 printk("end.\n");
502#endif
503 }
504 return IRQ_HANDLED;
505}
506
507/*
508 * -------------------------------------------------------------------
509 * Here ends the serial interrupt routines.
510 * -------------------------------------------------------------------
511 */
512
513/*
514 * ---------------------------------------------------------------
515 * Low level utility subroutines for the serial driver: routines to
516 * figure out the appropriate timeout for an interrupt chain, routines
517 * to initialize and startup a serial port, and routines to shutdown a
518 * serial port. Useful stuff like that.
519 * ---------------------------------------------------------------
520 */
521
522static int startup(struct tty_struct *tty, struct serial_state *info)
523{
524 struct tty_port *port = &info->tport;
525 unsigned long flags;
526 int retval=0;
527 unsigned long page;
528
529 page = get_zeroed_page(GFP_KERNEL);
530 if (!page)
531 return -ENOMEM;
532
533 local_irq_save(flags);
534
535 if (port->flags & ASYNC_INITIALIZED) {
536 free_page(page);
537 goto errout;
538 }
539
540 if (info->xmit.buf)
541 free_page(page);
542 else
543 info->xmit.buf = (unsigned char *) page;
544
545#ifdef SERIAL_DEBUG_OPEN
546 printk("starting up ttys%d ...", info->line);
547#endif
548
549 /* Clear anything in the input buffer */
550
551 custom.intreq = IF_RBF;
552 mb();
553
554 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
555 if (retval) {
556 if (serial_isroot()) {
557 set_bit(TTY_IO_ERROR, &tty->flags);
558 retval = 0;
559 }
560 goto errout;
561 }
562
563 /* enable both Rx and Tx interrupts */
564 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
565 mb();
566 info->IER = UART_IER_MSI;
567
568 /* remember current state of the DCD and CTS bits */
569 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
570
571 info->MCR = 0;
572 if (C_BAUD(tty))
573 info->MCR = SER_DTR | SER_RTS;
574 rtsdtr_ctrl(info->MCR);
575
576 clear_bit(TTY_IO_ERROR, &tty->flags);
577 info->xmit.head = info->xmit.tail = 0;
578
579 /*
580 * Set up the tty->alt_speed kludge
581 */
582 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
583 tty->alt_speed = 57600;
584 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
585 tty->alt_speed = 115200;
586 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
587 tty->alt_speed = 230400;
588 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
589 tty->alt_speed = 460800;
590
591 /*
592 * and set the speed of the serial port
593 */
594 change_speed(tty, info, NULL);
595
596 port->flags |= ASYNC_INITIALIZED;
597 local_irq_restore(flags);
598 return 0;
599
600errout:
601 local_irq_restore(flags);
602 return retval;
603}
604
605/*
606 * This routine will shutdown a serial port; interrupts are disabled, and
607 * DTR is dropped if the hangup on close termio flag is on.
608 */
609static void shutdown(struct tty_struct *tty, struct serial_state *info)
610{
611 unsigned long flags;
612 struct serial_state *state;
613
614 if (!(info->tport.flags & ASYNC_INITIALIZED))
615 return;
616
617 state = info;
618
619#ifdef SERIAL_DEBUG_OPEN
620 printk("Shutting down serial port %d ....\n", info->line);
621#endif
622
623 local_irq_save(flags); /* Disable interrupts */
624
625 /*
626 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
627 * here so the queue might never be waken up
628 */
629 wake_up_interruptible(&info->tport.delta_msr_wait);
630
631 /*
632 * Free the IRQ, if necessary
633 */
634 free_irq(IRQ_AMIGA_VERTB, info);
635
636 if (info->xmit.buf) {
637 free_page((unsigned long) info->xmit.buf);
638 info->xmit.buf = NULL;
639 }
640
641 info->IER = 0;
642 custom.intena = IF_RBF | IF_TBE;
643 mb();
644
645 /* disable break condition */
646 custom.adkcon = AC_UARTBRK;
647 mb();
648
649 if (tty->termios->c_cflag & HUPCL)
650 info->MCR &= ~(SER_DTR|SER_RTS);
651 rtsdtr_ctrl(info->MCR);
652
653 set_bit(TTY_IO_ERROR, &tty->flags);
654
655 info->tport.flags &= ~ASYNC_INITIALIZED;
656 local_irq_restore(flags);
657}
658
659
660/*
661 * This routine is called to set the UART divisor registers to match
662 * the specified baud rate for a serial port.
663 */
664static void change_speed(struct tty_struct *tty, struct serial_state *info,
665 struct ktermios *old_termios)
666{
667 struct tty_port *port = &info->tport;
668 int quot = 0, baud_base, baud;
669 unsigned cflag, cval = 0;
670 int bits;
671 unsigned long flags;
672
673 cflag = tty->termios->c_cflag;
674
675 /* Byte size is always 8 bits plus parity bit if requested */
676
677 cval = 3; bits = 10;
678 if (cflag & CSTOPB) {
679 cval |= 0x04;
680 bits++;
681 }
682 if (cflag & PARENB) {
683 cval |= UART_LCR_PARITY;
684 bits++;
685 }
686 if (!(cflag & PARODD))
687 cval |= UART_LCR_EPAR;
688#ifdef CMSPAR
689 if (cflag & CMSPAR)
690 cval |= UART_LCR_SPAR;
691#endif
692
693 /* Determine divisor based on baud rate */
694 baud = tty_get_baud_rate(tty);
695 if (!baud)
696 baud = 9600; /* B0 transition handled in rs_set_termios */
697 baud_base = info->baud_base;
698 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
699 quot = info->custom_divisor;
700 else {
701 if (baud == 134)
702 /* Special case since 134 is really 134.5 */
703 quot = (2*baud_base / 269);
704 else if (baud)
705 quot = baud_base / baud;
706 }
707 /* If the quotient is zero refuse the change */
708 if (!quot && old_termios) {
709 /* FIXME: Will need updating for new tty in the end */
710 tty->termios->c_cflag &= ~CBAUD;
711 tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
712 baud = tty_get_baud_rate(tty);
713 if (!baud)
714 baud = 9600;
715 if (baud == 38400 &&
716 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
717 quot = info->custom_divisor;
718 else {
719 if (baud == 134)
720 /* Special case since 134 is really 134.5 */
721 quot = (2*baud_base / 269);
722 else if (baud)
723 quot = baud_base / baud;
724 }
725 }
726 /* As a last resort, if the quotient is zero, default to 9600 bps */
727 if (!quot)
728 quot = baud_base / 9600;
729 info->quot = quot;
730 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
731 info->timeout += HZ/50; /* Add .02 seconds of slop */
732
733 /* CTS flow control flag and modem status interrupts */
734 info->IER &= ~UART_IER_MSI;
735 if (port->flags & ASYNC_HARDPPS_CD)
736 info->IER |= UART_IER_MSI;
737 if (cflag & CRTSCTS) {
738 port->flags |= ASYNC_CTS_FLOW;
739 info->IER |= UART_IER_MSI;
740 } else
741 port->flags &= ~ASYNC_CTS_FLOW;
742 if (cflag & CLOCAL)
743 port->flags &= ~ASYNC_CHECK_CD;
744 else {
745 port->flags |= ASYNC_CHECK_CD;
746 info->IER |= UART_IER_MSI;
747 }
748 /* TBD:
749 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
750 */
751
752 /*
753 * Set up parity check flag
754 */
755
756 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
757 if (I_INPCK(tty))
758 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
759 if (I_BRKINT(tty) || I_PARMRK(tty))
760 info->read_status_mask |= UART_LSR_BI;
761
762 /*
763 * Characters to ignore
764 */
765 info->ignore_status_mask = 0;
766 if (I_IGNPAR(tty))
767 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
768 if (I_IGNBRK(tty)) {
769 info->ignore_status_mask |= UART_LSR_BI;
770 /*
771 * If we're ignore parity and break indicators, ignore
772 * overruns too. (For real raw support).
773 */
774 if (I_IGNPAR(tty))
775 info->ignore_status_mask |= UART_LSR_OE;
776 }
777 /*
778 * !!! ignore all characters if CREAD is not set
779 */
780 if ((cflag & CREAD) == 0)
781 info->ignore_status_mask |= UART_LSR_DR;
782 local_irq_save(flags);
783
784 {
785 short serper;
786
787 /* Set up the baud rate */
788 serper = quot - 1;
789
790 /* Enable or disable parity bit */
791
792 if(cval & UART_LCR_PARITY)
793 serper |= (SERPER_PARENB);
794
795 custom.serper = serper;
796 mb();
797 }
798
799 local_irq_restore(flags);
800}
801
802static int rs_put_char(struct tty_struct *tty, unsigned char ch)
803{
804 struct serial_state *info;
805 unsigned long flags;
806
807 info = tty->driver_data;
808
809 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
810 return 0;
811
812 if (!info->xmit.buf)
813 return 0;
814
815 local_irq_save(flags);
816 if (CIRC_SPACE(info->xmit.head,
817 info->xmit.tail,
818 SERIAL_XMIT_SIZE) == 0) {
819 local_irq_restore(flags);
820 return 0;
821 }
822
823 info->xmit.buf[info->xmit.head++] = ch;
824 info->xmit.head &= SERIAL_XMIT_SIZE-1;
825 local_irq_restore(flags);
826 return 1;
827}
828
829static void rs_flush_chars(struct tty_struct *tty)
830{
831 struct serial_state *info = tty->driver_data;
832 unsigned long flags;
833
834 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
835 return;
836
837 if (info->xmit.head == info->xmit.tail
838 || tty->stopped
839 || tty->hw_stopped
840 || !info->xmit.buf)
841 return;
842
843 local_irq_save(flags);
844 info->IER |= UART_IER_THRI;
845 custom.intena = IF_SETCLR | IF_TBE;
846 mb();
847 /* set a pending Tx Interrupt, transmitter should restart now */
848 custom.intreq = IF_SETCLR | IF_TBE;
849 mb();
850 local_irq_restore(flags);
851}
852
853static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
854{
855 int c, ret = 0;
856 struct serial_state *info = tty->driver_data;
857 unsigned long flags;
858
859 if (serial_paranoia_check(info, tty->name, "rs_write"))
860 return 0;
861
862 if (!info->xmit.buf)
863 return 0;
864
865 local_irq_save(flags);
866 while (1) {
867 c = CIRC_SPACE_TO_END(info->xmit.head,
868 info->xmit.tail,
869 SERIAL_XMIT_SIZE);
870 if (count < c)
871 c = count;
872 if (c <= 0) {
873 break;
874 }
875 memcpy(info->xmit.buf + info->xmit.head, buf, c);
876 info->xmit.head = ((info->xmit.head + c) &
877 (SERIAL_XMIT_SIZE-1));
878 buf += c;
879 count -= c;
880 ret += c;
881 }
882 local_irq_restore(flags);
883
884 if (info->xmit.head != info->xmit.tail
885 && !tty->stopped
886 && !tty->hw_stopped
887 && !(info->IER & UART_IER_THRI)) {
888 info->IER |= UART_IER_THRI;
889 local_irq_disable();
890 custom.intena = IF_SETCLR | IF_TBE;
891 mb();
892 /* set a pending Tx Interrupt, transmitter should restart now */
893 custom.intreq = IF_SETCLR | IF_TBE;
894 mb();
895 local_irq_restore(flags);
896 }
897 return ret;
898}
899
900static int rs_write_room(struct tty_struct *tty)
901{
902 struct serial_state *info = tty->driver_data;
903
904 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
905 return 0;
906 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
907}
908
909static int rs_chars_in_buffer(struct tty_struct *tty)
910{
911 struct serial_state *info = tty->driver_data;
912
913 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
914 return 0;
915 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
916}
917
918static void rs_flush_buffer(struct tty_struct *tty)
919{
920 struct serial_state *info = tty->driver_data;
921 unsigned long flags;
922
923 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
924 return;
925 local_irq_save(flags);
926 info->xmit.head = info->xmit.tail = 0;
927 local_irq_restore(flags);
928 tty_wakeup(tty);
929}
930
931/*
932 * This function is used to send a high-priority XON/XOFF character to
933 * the device
934 */
935static void rs_send_xchar(struct tty_struct *tty, char ch)
936{
937 struct serial_state *info = tty->driver_data;
938 unsigned long flags;
939
940 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
941 return;
942
943 info->x_char = ch;
944 if (ch) {
945 /* Make sure transmit interrupts are on */
946
947 /* Check this ! */
948 local_irq_save(flags);
949 if(!(custom.intenar & IF_TBE)) {
950 custom.intena = IF_SETCLR | IF_TBE;
951 mb();
952 /* set a pending Tx Interrupt, transmitter should restart now */
953 custom.intreq = IF_SETCLR | IF_TBE;
954 mb();
955 }
956 local_irq_restore(flags);
957
958 info->IER |= UART_IER_THRI;
959 }
960}
961
962/*
963 * ------------------------------------------------------------
964 * rs_throttle()
965 *
966 * This routine is called by the upper-layer tty layer to signal that
967 * incoming characters should be throttled.
968 * ------------------------------------------------------------
969 */
970static void rs_throttle(struct tty_struct * tty)
971{
972 struct serial_state *info = tty->driver_data;
973 unsigned long flags;
974#ifdef SERIAL_DEBUG_THROTTLE
975 char buf[64];
976
977 printk("throttle %s: %d....\n", tty_name(tty, buf),
978 tty->ldisc.chars_in_buffer(tty));
979#endif
980
981 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
982 return;
983
984 if (I_IXOFF(tty))
985 rs_send_xchar(tty, STOP_CHAR(tty));
986
987 if (tty->termios->c_cflag & CRTSCTS)
988 info->MCR &= ~SER_RTS;
989
990 local_irq_save(flags);
991 rtsdtr_ctrl(info->MCR);
992 local_irq_restore(flags);
993}
994
995static void rs_unthrottle(struct tty_struct * tty)
996{
997 struct serial_state *info = tty->driver_data;
998 unsigned long flags;
999#ifdef SERIAL_DEBUG_THROTTLE
1000 char buf[64];
1001
1002 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1003 tty->ldisc.chars_in_buffer(tty));
1004#endif
1005
1006 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1007 return;
1008
1009 if (I_IXOFF(tty)) {
1010 if (info->x_char)
1011 info->x_char = 0;
1012 else
1013 rs_send_xchar(tty, START_CHAR(tty));
1014 }
1015 if (tty->termios->c_cflag & CRTSCTS)
1016 info->MCR |= SER_RTS;
1017 local_irq_save(flags);
1018 rtsdtr_ctrl(info->MCR);
1019 local_irq_restore(flags);
1020}
1021
1022/*
1023 * ------------------------------------------------------------
1024 * rs_ioctl() and friends
1025 * ------------------------------------------------------------
1026 */
1027
1028static int get_serial_info(struct tty_struct *tty, struct serial_state *state,
1029 struct serial_struct __user * retinfo)
1030{
1031 struct serial_struct tmp;
1032
1033 if (!retinfo)
1034 return -EFAULT;
1035 memset(&tmp, 0, sizeof(tmp));
1036 tty_lock();
1037 tmp.line = tty->index;
1038 tmp.port = state->port;
1039 tmp.flags = state->tport.flags;
1040 tmp.xmit_fifo_size = state->xmit_fifo_size;
1041 tmp.baud_base = state->baud_base;
1042 tmp.close_delay = state->tport.close_delay;
1043 tmp.closing_wait = state->tport.closing_wait;
1044 tmp.custom_divisor = state->custom_divisor;
1045 tty_unlock();
1046 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1047 return -EFAULT;
1048 return 0;
1049}
1050
1051static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
1052 struct serial_struct __user * new_info)
1053{
1054 struct tty_port *port = &state->tport;
1055 struct serial_struct new_serial;
1056 bool change_spd;
1057 int retval = 0;
1058
1059 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1060 return -EFAULT;
1061
1062 tty_lock();
1063 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
1064 new_serial.custom_divisor != state->custom_divisor;
1065 if (new_serial.irq || new_serial.port != state->port ||
1066 new_serial.xmit_fifo_size != state->xmit_fifo_size) {
1067 tty_unlock();
1068 return -EINVAL;
1069 }
1070
1071 if (!serial_isroot()) {
1072 if ((new_serial.baud_base != state->baud_base) ||
1073 (new_serial.close_delay != port->close_delay) ||
1074 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1075 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1076 (port->flags & ~ASYNC_USR_MASK))) {
1077 tty_unlock();
1078 return -EPERM;
1079 }
1080 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1081 (new_serial.flags & ASYNC_USR_MASK));
1082 state->custom_divisor = new_serial.custom_divisor;
1083 goto check_and_exit;
1084 }
1085
1086 if (new_serial.baud_base < 9600) {
1087 tty_unlock();
1088 return -EINVAL;
1089 }
1090
1091 /*
1092 * OK, past this point, all the error checking has been done.
1093 * At this point, we start making changes.....
1094 */
1095
1096 state->baud_base = new_serial.baud_base;
1097 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1098 (new_serial.flags & ASYNC_FLAGS));
1099 state->custom_divisor = new_serial.custom_divisor;
1100 port->close_delay = new_serial.close_delay * HZ/100;
1101 port->closing_wait = new_serial.closing_wait * HZ/100;
1102 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1103
1104check_and_exit:
1105 if (port->flags & ASYNC_INITIALIZED) {
1106 if (change_spd) {
1107 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1108 tty->alt_speed = 57600;
1109 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1110 tty->alt_speed = 115200;
1111 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1112 tty->alt_speed = 230400;
1113 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1114 tty->alt_speed = 460800;
1115 change_speed(tty, state, NULL);
1116 }
1117 } else
1118 retval = startup(tty, state);
1119 tty_unlock();
1120 return retval;
1121}
1122
1123
1124/*
1125 * get_lsr_info - get line status register info
1126 *
1127 * Purpose: Let user call ioctl() to get info when the UART physically
1128 * is emptied. On bus types like RS485, the transmitter must
1129 * release the bus after transmitting. This must be done when
1130 * the transmit shift register is empty, not be done when the
1131 * transmit holding register is empty. This functionality
1132 * allows an RS485 driver to be written in user space.
1133 */
1134static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1135{
1136 unsigned char status;
1137 unsigned int result;
1138 unsigned long flags;
1139
1140 local_irq_save(flags);
1141 status = custom.serdatr;
1142 mb();
1143 local_irq_restore(flags);
1144 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1145 if (copy_to_user(value, &result, sizeof(int)))
1146 return -EFAULT;
1147 return 0;
1148}
1149
1150
1151static int rs_tiocmget(struct tty_struct *tty)
1152{
1153 struct serial_state *info = tty->driver_data;
1154 unsigned char control, status;
1155 unsigned long flags;
1156
1157 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1158 return -ENODEV;
1159 if (tty->flags & (1 << TTY_IO_ERROR))
1160 return -EIO;
1161
1162 control = info->MCR;
1163 local_irq_save(flags);
1164 status = ciab.pra;
1165 local_irq_restore(flags);
1166 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1167 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1168 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1169 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1170 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1171}
1172
1173static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1174 unsigned int clear)
1175{
1176 struct serial_state *info = tty->driver_data;
1177 unsigned long flags;
1178
1179 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1180 return -ENODEV;
1181 if (tty->flags & (1 << TTY_IO_ERROR))
1182 return -EIO;
1183
1184 local_irq_save(flags);
1185 if (set & TIOCM_RTS)
1186 info->MCR |= SER_RTS;
1187 if (set & TIOCM_DTR)
1188 info->MCR |= SER_DTR;
1189 if (clear & TIOCM_RTS)
1190 info->MCR &= ~SER_RTS;
1191 if (clear & TIOCM_DTR)
1192 info->MCR &= ~SER_DTR;
1193 rtsdtr_ctrl(info->MCR);
1194 local_irq_restore(flags);
1195 return 0;
1196}
1197
1198/*
1199 * rs_break() --- routine which turns the break handling on or off
1200 */
1201static int rs_break(struct tty_struct *tty, int break_state)
1202{
1203 struct serial_state *info = tty->driver_data;
1204 unsigned long flags;
1205
1206 if (serial_paranoia_check(info, tty->name, "rs_break"))
1207 return -EINVAL;
1208
1209 local_irq_save(flags);
1210 if (break_state == -1)
1211 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1212 else
1213 custom.adkcon = AC_UARTBRK;
1214 mb();
1215 local_irq_restore(flags);
1216 return 0;
1217}
1218
1219/*
1220 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1221 * Return: write counters to the user passed counter struct
1222 * NB: both 1->0 and 0->1 transitions are counted except for
1223 * RI where only 0->1 is counted.
1224 */
1225static int rs_get_icount(struct tty_struct *tty,
1226 struct serial_icounter_struct *icount)
1227{
1228 struct serial_state *info = tty->driver_data;
1229 struct async_icount cnow;
1230 unsigned long flags;
1231
1232 local_irq_save(flags);
1233 cnow = info->icount;
1234 local_irq_restore(flags);
1235 icount->cts = cnow.cts;
1236 icount->dsr = cnow.dsr;
1237 icount->rng = cnow.rng;
1238 icount->dcd = cnow.dcd;
1239 icount->rx = cnow.rx;
1240 icount->tx = cnow.tx;
1241 icount->frame = cnow.frame;
1242 icount->overrun = cnow.overrun;
1243 icount->parity = cnow.parity;
1244 icount->brk = cnow.brk;
1245 icount->buf_overrun = cnow.buf_overrun;
1246
1247 return 0;
1248}
1249
1250static int rs_ioctl(struct tty_struct *tty,
1251 unsigned int cmd, unsigned long arg)
1252{
1253 struct serial_state *info = tty->driver_data;
1254 struct async_icount cprev, cnow; /* kernel counter temps */
1255 void __user *argp = (void __user *)arg;
1256 unsigned long flags;
1257
1258 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1259 return -ENODEV;
1260
1261 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1262 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1263 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1264 if (tty->flags & (1 << TTY_IO_ERROR))
1265 return -EIO;
1266 }
1267
1268 switch (cmd) {
1269 case TIOCGSERIAL:
1270 return get_serial_info(tty, info, argp);
1271 case TIOCSSERIAL:
1272 return set_serial_info(tty, info, argp);
1273 case TIOCSERCONFIG:
1274 return 0;
1275
1276 case TIOCSERGETLSR: /* Get line status register */
1277 return get_lsr_info(info, argp);
1278
1279 case TIOCSERGSTRUCT:
1280 if (copy_to_user(argp,
1281 info, sizeof(struct serial_state)))
1282 return -EFAULT;
1283 return 0;
1284
1285 /*
1286 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1287 * - mask passed in arg for lines of interest
1288 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1289 * Caller should use TIOCGICOUNT to see which one it was
1290 */
1291 case TIOCMIWAIT:
1292 local_irq_save(flags);
1293 /* note the counters on entry */
1294 cprev = info->icount;
1295 local_irq_restore(flags);
1296 while (1) {
1297 interruptible_sleep_on(&info->tport.delta_msr_wait);
1298 /* see if a signal did it */
1299 if (signal_pending(current))
1300 return -ERESTARTSYS;
1301 local_irq_save(flags);
1302 cnow = info->icount; /* atomic copy */
1303 local_irq_restore(flags);
1304 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1305 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1306 return -EIO; /* no change => error */
1307 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1308 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1309 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1310 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1311 return 0;
1312 }
1313 cprev = cnow;
1314 }
1315 /* NOTREACHED */
1316
1317 case TIOCSERGWILD:
1318 case TIOCSERSWILD:
1319 /* "setserial -W" is called in Debian boot */
1320 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1321 return 0;
1322
1323 default:
1324 return -ENOIOCTLCMD;
1325 }
1326 return 0;
1327}
1328
1329static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1330{
1331 struct serial_state *info = tty->driver_data;
1332 unsigned long flags;
1333 unsigned int cflag = tty->termios->c_cflag;
1334
1335 change_speed(tty, info, old_termios);
1336
1337 /* Handle transition to B0 status */
1338 if ((old_termios->c_cflag & CBAUD) &&
1339 !(cflag & CBAUD)) {
1340 info->MCR &= ~(SER_DTR|SER_RTS);
1341 local_irq_save(flags);
1342 rtsdtr_ctrl(info->MCR);
1343 local_irq_restore(flags);
1344 }
1345
1346 /* Handle transition away from B0 status */
1347 if (!(old_termios->c_cflag & CBAUD) &&
1348 (cflag & CBAUD)) {
1349 info->MCR |= SER_DTR;
1350 if (!(tty->termios->c_cflag & CRTSCTS) ||
1351 !test_bit(TTY_THROTTLED, &tty->flags)) {
1352 info->MCR |= SER_RTS;
1353 }
1354 local_irq_save(flags);
1355 rtsdtr_ctrl(info->MCR);
1356 local_irq_restore(flags);
1357 }
1358
1359 /* Handle turning off CRTSCTS */
1360 if ((old_termios->c_cflag & CRTSCTS) &&
1361 !(tty->termios->c_cflag & CRTSCTS)) {
1362 tty->hw_stopped = 0;
1363 rs_start(tty);
1364 }
1365
1366#if 0
1367 /*
1368 * No need to wake up processes in open wait, since they
1369 * sample the CLOCAL flag once, and don't recheck it.
1370 * XXX It's not clear whether the current behavior is correct
1371 * or not. Hence, this may change.....
1372 */
1373 if (!(old_termios->c_cflag & CLOCAL) &&
1374 (tty->termios->c_cflag & CLOCAL))
1375 wake_up_interruptible(&info->open_wait);
1376#endif
1377}
1378
1379/*
1380 * ------------------------------------------------------------
1381 * rs_close()
1382 *
1383 * This routine is called when the serial port gets closed. First, we
1384 * wait for the last remaining data to be sent. Then, we unlink its
1385 * async structure from the interrupt chain if necessary, and we free
1386 * that IRQ if nothing is left in the chain.
1387 * ------------------------------------------------------------
1388 */
1389static void rs_close(struct tty_struct *tty, struct file * filp)
1390{
1391 struct serial_state *state = tty->driver_data;
1392 struct tty_port *port = &state->tport;
1393
1394 if (serial_paranoia_check(state, tty->name, "rs_close"))
1395 return;
1396
1397 if (tty_port_close_start(port, tty, filp) == 0)
1398 return;
1399
1400 /*
1401 * At this point we stop accepting input. To do this, we
1402 * disable the receive line status interrupts, and tell the
1403 * interrupt driver to stop checking the data ready bit in the
1404 * line status register.
1405 */
1406 state->read_status_mask &= ~UART_LSR_DR;
1407 if (port->flags & ASYNC_INITIALIZED) {
1408 /* disable receive interrupts */
1409 custom.intena = IF_RBF;
1410 mb();
1411 /* clear any pending receive interrupt */
1412 custom.intreq = IF_RBF;
1413 mb();
1414
1415 /*
1416 * Before we drop DTR, make sure the UART transmitter
1417 * has completely drained; this is especially
1418 * important if there is a transmit FIFO!
1419 */
1420 rs_wait_until_sent(tty, state->timeout);
1421 }
1422 shutdown(tty, state);
1423 rs_flush_buffer(tty);
1424
1425 tty_ldisc_flush(tty);
1426 port->tty = NULL;
1427
1428 tty_port_close_end(port, tty);
1429}
1430
1431/*
1432 * rs_wait_until_sent() --- wait until the transmitter is empty
1433 */
1434static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1435{
1436 struct serial_state *info = tty->driver_data;
1437 unsigned long orig_jiffies, char_time;
1438 int lsr;
1439
1440 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1441 return;
1442
1443 if (info->xmit_fifo_size == 0)
1444 return; /* Just in case.... */
1445
1446 orig_jiffies = jiffies;
1447
1448 /*
1449 * Set the check interval to be 1/5 of the estimated time to
1450 * send a single character, and make it at least 1. The check
1451 * interval should also be less than the timeout.
1452 *
1453 * Note: we have to use pretty tight timings here to satisfy
1454 * the NIST-PCTS.
1455 */
1456 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1457 char_time = char_time / 5;
1458 if (char_time == 0)
1459 char_time = 1;
1460 if (timeout)
1461 char_time = min_t(unsigned long, char_time, timeout);
1462 /*
1463 * If the transmitter hasn't cleared in twice the approximate
1464 * amount of time to send the entire FIFO, it probably won't
1465 * ever clear. This assumes the UART isn't doing flow
1466 * control, which is currently the case. Hence, if it ever
1467 * takes longer than info->timeout, this is probably due to a
1468 * UART bug of some kind. So, we clamp the timeout parameter at
1469 * 2*info->timeout.
1470 */
1471 if (!timeout || timeout > 2*info->timeout)
1472 timeout = 2*info->timeout;
1473#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1474 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1475 printk("jiff=%lu...", jiffies);
1476#endif
1477 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1478#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1479 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1480#endif
1481 msleep_interruptible(jiffies_to_msecs(char_time));
1482 if (signal_pending(current))
1483 break;
1484 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1485 break;
1486 }
1487 __set_current_state(TASK_RUNNING);
1488
1489#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1490 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1491#endif
1492}
1493
1494/*
1495 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1496 */
1497static void rs_hangup(struct tty_struct *tty)
1498{
1499 struct serial_state *info = tty->driver_data;
1500
1501 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1502 return;
1503
1504 rs_flush_buffer(tty);
1505 shutdown(tty, info);
1506 info->tport.count = 0;
1507 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
1508 info->tport.tty = NULL;
1509 wake_up_interruptible(&info->tport.open_wait);
1510}
1511
1512/*
1513 * This routine is called whenever a serial port is opened. It
1514 * enables interrupts for a serial port, linking in its async structure into
1515 * the IRQ chain. It also performs the serial-specific
1516 * initialization for the tty structure.
1517 */
1518static int rs_open(struct tty_struct *tty, struct file * filp)
1519{
1520 struct serial_state *info = rs_table + tty->index;
1521 struct tty_port *port = &info->tport;
1522 int retval;
1523
1524 port->count++;
1525 port->tty = tty;
1526 tty->driver_data = info;
1527 tty->port = port;
1528 if (serial_paranoia_check(info, tty->name, "rs_open"))
1529 return -ENODEV;
1530
1531 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1532
1533 retval = startup(tty, info);
1534 if (retval) {
1535 return retval;
1536 }
1537
1538 return tty_port_block_til_ready(port, tty, filp);
1539}
1540
1541/*
1542 * /proc fs routines....
1543 */
1544
1545static inline void line_info(struct seq_file *m, int line,
1546 struct serial_state *state)
1547{
1548 char stat_buf[30], control, status;
1549 unsigned long flags;
1550
1551 seq_printf(m, "%d: uart:amiga_builtin", line);
1552
1553 local_irq_save(flags);
1554 status = ciab.pra;
1555 control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status;
1556 local_irq_restore(flags);
1557
1558 stat_buf[0] = 0;
1559 stat_buf[1] = 0;
1560 if(!(control & SER_RTS))
1561 strcat(stat_buf, "|RTS");
1562 if(!(status & SER_CTS))
1563 strcat(stat_buf, "|CTS");
1564 if(!(control & SER_DTR))
1565 strcat(stat_buf, "|DTR");
1566 if(!(status & SER_DSR))
1567 strcat(stat_buf, "|DSR");
1568 if(!(status & SER_DCD))
1569 strcat(stat_buf, "|CD");
1570
1571 if (state->quot)
1572 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1573
1574 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1575
1576 if (state->icount.frame)
1577 seq_printf(m, " fe:%d", state->icount.frame);
1578
1579 if (state->icount.parity)
1580 seq_printf(m, " pe:%d", state->icount.parity);
1581
1582 if (state->icount.brk)
1583 seq_printf(m, " brk:%d", state->icount.brk);
1584
1585 if (state->icount.overrun)
1586 seq_printf(m, " oe:%d", state->icount.overrun);
1587
1588 /*
1589 * Last thing is the RS-232 status lines
1590 */
1591 seq_printf(m, " %s\n", stat_buf+1);
1592}
1593
1594static int rs_proc_show(struct seq_file *m, void *v)
1595{
1596 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1597 line_info(m, 0, &rs_table[0]);
1598 return 0;
1599}
1600
1601static int rs_proc_open(struct inode *inode, struct file *file)
1602{
1603 return single_open(file, rs_proc_show, NULL);
1604}
1605
1606static const struct file_operations rs_proc_fops = {
1607 .owner = THIS_MODULE,
1608 .open = rs_proc_open,
1609 .read = seq_read,
1610 .llseek = seq_lseek,
1611 .release = single_release,
1612};
1613
1614/*
1615 * ---------------------------------------------------------------------
1616 * rs_init() and friends
1617 *
1618 * rs_init() is called at boot-time to initialize the serial driver.
1619 * ---------------------------------------------------------------------
1620 */
1621
1622/*
1623 * This routine prints out the appropriate serial driver version
1624 * number, and identifies which options were configured into this
1625 * driver.
1626 */
1627static void show_serial_version(void)
1628{
1629 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1630}
1631
1632
1633static const struct tty_operations serial_ops = {
1634 .open = rs_open,
1635 .close = rs_close,
1636 .write = rs_write,
1637 .put_char = rs_put_char,
1638 .flush_chars = rs_flush_chars,
1639 .write_room = rs_write_room,
1640 .chars_in_buffer = rs_chars_in_buffer,
1641 .flush_buffer = rs_flush_buffer,
1642 .ioctl = rs_ioctl,
1643 .throttle = rs_throttle,
1644 .unthrottle = rs_unthrottle,
1645 .set_termios = rs_set_termios,
1646 .stop = rs_stop,
1647 .start = rs_start,
1648 .hangup = rs_hangup,
1649 .break_ctl = rs_break,
1650 .send_xchar = rs_send_xchar,
1651 .wait_until_sent = rs_wait_until_sent,
1652 .tiocmget = rs_tiocmget,
1653 .tiocmset = rs_tiocmset,
1654 .get_icount = rs_get_icount,
1655 .proc_fops = &rs_proc_fops,
1656};
1657
1658static int amiga_carrier_raised(struct tty_port *port)
1659{
1660 return !(ciab.pra & SER_DCD);
1661}
1662
1663static void amiga_dtr_rts(struct tty_port *port, int raise)
1664{
1665 struct serial_state *info = container_of(port, struct serial_state,
1666 tport);
1667 unsigned long flags;
1668
1669 if (raise)
1670 info->MCR |= SER_DTR|SER_RTS;
1671 else
1672 info->MCR &= ~(SER_DTR|SER_RTS);
1673
1674 local_irq_save(flags);
1675 rtsdtr_ctrl(info->MCR);
1676 local_irq_restore(flags);
1677}
1678
1679static const struct tty_port_operations amiga_port_ops = {
1680 .carrier_raised = amiga_carrier_raised,
1681 .dtr_rts = amiga_dtr_rts,
1682};
1683
1684/*
1685 * The serial driver boot-time initialization code!
1686 */
1687static int __init amiga_serial_probe(struct platform_device *pdev)
1688{
1689 unsigned long flags;
1690 struct serial_state * state;
1691 int error;
1692
1693 serial_driver = alloc_tty_driver(NR_PORTS);
1694 if (!serial_driver)
1695 return -ENOMEM;
1696
1697 show_serial_version();
1698
1699 /* Initialize the tty_driver structure */
1700
1701 serial_driver->driver_name = "amiserial";
1702 serial_driver->name = "ttyS";
1703 serial_driver->major = TTY_MAJOR;
1704 serial_driver->minor_start = 64;
1705 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1706 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1707 serial_driver->init_termios = tty_std_termios;
1708 serial_driver->init_termios.c_cflag =
1709 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1710 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1711 tty_set_operations(serial_driver, &serial_ops);
1712
1713 error = tty_register_driver(serial_driver);
1714 if (error)
1715 goto fail_put_tty_driver;
1716
1717 state = rs_table;
1718 state->port = (int)&custom.serdatr; /* Just to give it a value */
1719 state->custom_divisor = 0;
1720 state->icount.cts = state->icount.dsr =
1721 state->icount.rng = state->icount.dcd = 0;
1722 state->icount.rx = state->icount.tx = 0;
1723 state->icount.frame = state->icount.parity = 0;
1724 state->icount.overrun = state->icount.brk = 0;
1725 tty_port_init(&state->tport);
1726 state->tport.ops = &amiga_port_ops;
1727
1728 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1729
1730 /* Hardware set up */
1731
1732 state->baud_base = amiga_colorclock;
1733 state->xmit_fifo_size = 1;
1734
1735 /* set ISRs, and then disable the rx interrupts */
1736 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1737 if (error)
1738 goto fail_unregister;
1739
1740 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1741 "serial RX", state);
1742 if (error)
1743 goto fail_free_irq;
1744
1745 local_irq_save(flags);
1746
1747 /* turn off Rx and Tx interrupts */
1748 custom.intena = IF_RBF | IF_TBE;
1749 mb();
1750
1751 /* clear any pending interrupt */
1752 custom.intreq = IF_RBF | IF_TBE;
1753 mb();
1754
1755 local_irq_restore(flags);
1756
1757 /*
1758 * set the appropriate directions for the modem control flags,
1759 * and clear RTS and DTR
1760 */
1761 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1762 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1763
1764 platform_set_drvdata(pdev, state);
1765
1766 return 0;
1767
1768fail_free_irq:
1769 free_irq(IRQ_AMIGA_TBE, state);
1770fail_unregister:
1771 tty_unregister_driver(serial_driver);
1772fail_put_tty_driver:
1773 put_tty_driver(serial_driver);
1774 return error;
1775}
1776
1777static int __exit amiga_serial_remove(struct platform_device *pdev)
1778{
1779 int error;
1780 struct serial_state *state = platform_get_drvdata(pdev);
1781
1782 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1783 if ((error = tty_unregister_driver(serial_driver)))
1784 printk("SERIAL: failed to unregister serial driver (%d)\n",
1785 error);
1786 put_tty_driver(serial_driver);
1787
1788 free_irq(IRQ_AMIGA_TBE, state);
1789 free_irq(IRQ_AMIGA_RBF, state);
1790
1791 platform_set_drvdata(pdev, NULL);
1792
1793 return error;
1794}
1795
1796static struct platform_driver amiga_serial_driver = {
1797 .remove = __exit_p(amiga_serial_remove),
1798 .driver = {
1799 .name = "amiga-serial",
1800 .owner = THIS_MODULE,
1801 },
1802};
1803
1804static int __init amiga_serial_init(void)
1805{
1806 return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
1807}
1808
1809module_init(amiga_serial_init);
1810
1811static void __exit amiga_serial_exit(void)
1812{
1813 platform_driver_unregister(&amiga_serial_driver);
1814}
1815
1816module_exit(amiga_serial_exit);
1817
1818
1819#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1820
1821/*
1822 * ------------------------------------------------------------
1823 * Serial console driver
1824 * ------------------------------------------------------------
1825 */
1826
1827static void amiga_serial_putc(char c)
1828{
1829 custom.serdat = (unsigned char)c | 0x100;
1830 while (!(custom.serdatr & 0x2000))
1831 barrier();
1832}
1833
1834/*
1835 * Print a string to the serial port trying not to disturb
1836 * any possible real use of the port...
1837 *
1838 * The console must be locked when we get here.
1839 */
1840static void serial_console_write(struct console *co, const char *s,
1841 unsigned count)
1842{
1843 unsigned short intena = custom.intenar;
1844
1845 custom.intena = IF_TBE;
1846
1847 while (count--) {
1848 if (*s == '\n')
1849 amiga_serial_putc('\r');
1850 amiga_serial_putc(*s++);
1851 }
1852
1853 custom.intena = IF_SETCLR | (intena & IF_TBE);
1854}
1855
1856static struct tty_driver *serial_console_device(struct console *c, int *index)
1857{
1858 *index = 0;
1859 return serial_driver;
1860}
1861
1862static struct console sercons = {
1863 .name = "ttyS",
1864 .write = serial_console_write,
1865 .device = serial_console_device,
1866 .flags = CON_PRINTBUFFER,
1867 .index = -1,
1868};
1869
1870/*
1871 * Register console.
1872 */
1873static int __init amiserial_console_init(void)
1874{
1875 register_console(&sercons);
1876 return 0;
1877}
1878console_initcall(amiserial_console_init);
1879
1880#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1881
1882MODULE_LICENSE("GPL");
1883MODULE_ALIAS("platform:amiga-serial");