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