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