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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 u8 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 u8 ch, flag;
182 struct async_icount *icount;
183 bool overrun = false;
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 return;
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 overrun = true;
255 }
256 }
257 tty_insert_flip_char(&info->tport, ch, flag);
258 if (overrun)
259 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
260 tty_flip_buffer_push(&info->tport);
261}
262
263static void transmit_chars(struct serial_state *info)
264{
265 amiga_custom.intreq = IF_TBE;
266 mb();
267 if (info->x_char) {
268 amiga_custom.serdat = info->x_char | 0x100;
269 mb();
270 info->icount.tx++;
271 info->x_char = 0;
272 return;
273 }
274 if (info->xmit.head == info->xmit.tail
275 || info->tport.tty->flow.stopped
276 || info->tport.tty->hw_stopped) {
277 info->IER &= ~UART_IER_THRI;
278 amiga_custom.intena = IF_TBE;
279 mb();
280 return;
281 }
282
283 amiga_custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
284 mb();
285 info->xmit.tail = info->xmit.tail & (UART_XMIT_SIZE - 1);
286 info->icount.tx++;
287
288 if (CIRC_CNT(info->xmit.head,
289 info->xmit.tail,
290 UART_XMIT_SIZE) < WAKEUP_CHARS)
291 tty_wakeup(info->tport.tty);
292
293#ifdef SERIAL_DEBUG_INTR
294 printk("THRE...");
295#endif
296 if (info->xmit.head == info->xmit.tail) {
297 amiga_custom.intena = IF_TBE;
298 mb();
299 info->IER &= ~UART_IER_THRI;
300 }
301}
302
303static void check_modem_status(struct serial_state *info)
304{
305 struct tty_port *port = &info->tport;
306 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
307 unsigned char dstatus;
308 struct async_icount *icount;
309
310 /* Determine bits that have changed */
311 dstatus = status ^ current_ctl_bits;
312 current_ctl_bits = status;
313
314 if (dstatus) {
315 icount = &info->icount;
316 /* update input line counters */
317 if (dstatus & SER_DSR)
318 icount->dsr++;
319 if (dstatus & SER_DCD) {
320 icount->dcd++;
321 }
322 if (dstatus & SER_CTS)
323 icount->cts++;
324 wake_up_interruptible(&port->delta_msr_wait);
325 }
326
327 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
328#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
329 printk("ttyS%d CD now %s...", info->line,
330 (!(status & SER_DCD)) ? "on" : "off");
331#endif
332 if (!(status & SER_DCD))
333 wake_up_interruptible(&port->open_wait);
334 else {
335#ifdef SERIAL_DEBUG_OPEN
336 printk("doing serial hangup...");
337#endif
338 if (port->tty)
339 tty_hangup(port->tty);
340 }
341 }
342 if (tty_port_cts_enabled(port)) {
343 if (port->tty->hw_stopped) {
344 if (!(status & SER_CTS)) {
345#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
346 printk("CTS tx start...");
347#endif
348 port->tty->hw_stopped = false;
349 info->IER |= UART_IER_THRI;
350 amiga_custom.intena = IF_SETCLR | IF_TBE;
351 mb();
352 /* set a pending Tx Interrupt, transmitter should restart now */
353 amiga_custom.intreq = IF_SETCLR | IF_TBE;
354 mb();
355 tty_wakeup(port->tty);
356 return;
357 }
358 } else {
359 if ((status & SER_CTS)) {
360#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
361 printk("CTS tx stop...");
362#endif
363 port->tty->hw_stopped = true;
364 info->IER &= ~UART_IER_THRI;
365 /* disable Tx interrupt and remove any pending interrupts */
366 amiga_custom.intena = IF_TBE;
367 mb();
368 amiga_custom.intreq = IF_TBE;
369 mb();
370 }
371 }
372 }
373}
374
375static irqreturn_t ser_vbl_int( int irq, void *data)
376{
377 /* vbl is just a periodic interrupt we tie into to update modem status */
378 struct serial_state *info = data;
379 /*
380 * TBD - is it better to unregister from this interrupt or to
381 * ignore it if MSI is clear ?
382 */
383 if(info->IER & UART_IER_MSI)
384 check_modem_status(info);
385 return IRQ_HANDLED;
386}
387
388static irqreturn_t ser_rx_int(int irq, void *dev_id)
389{
390 struct serial_state *info = dev_id;
391
392#ifdef SERIAL_DEBUG_INTR
393 printk("ser_rx_int...");
394#endif
395
396 if (!info->tport.tty)
397 return IRQ_NONE;
398
399 receive_chars(info);
400#ifdef SERIAL_DEBUG_INTR
401 printk("end.\n");
402#endif
403 return IRQ_HANDLED;
404}
405
406static irqreturn_t ser_tx_int(int irq, void *dev_id)
407{
408 struct serial_state *info = dev_id;
409
410 if (amiga_custom.serdatr & SDR_TBE) {
411#ifdef SERIAL_DEBUG_INTR
412 printk("ser_tx_int...");
413#endif
414
415 if (!info->tport.tty)
416 return IRQ_NONE;
417
418 transmit_chars(info);
419#ifdef SERIAL_DEBUG_INTR
420 printk("end.\n");
421#endif
422 }
423 return IRQ_HANDLED;
424}
425
426/*
427 * -------------------------------------------------------------------
428 * Here ends the serial interrupt routines.
429 * -------------------------------------------------------------------
430 */
431
432/*
433 * ---------------------------------------------------------------
434 * Low level utility subroutines for the serial driver: routines to
435 * figure out the appropriate timeout for an interrupt chain, routines
436 * to initialize and startup a serial port, and routines to shutdown a
437 * serial port. Useful stuff like that.
438 * ---------------------------------------------------------------
439 */
440
441static int startup(struct tty_struct *tty, struct serial_state *info)
442{
443 struct tty_port *port = &info->tport;
444 unsigned long flags;
445 int retval=0;
446 unsigned long page;
447
448 page = get_zeroed_page(GFP_KERNEL);
449 if (!page)
450 return -ENOMEM;
451
452 local_irq_save(flags);
453
454 if (tty_port_initialized(port)) {
455 free_page(page);
456 goto errout;
457 }
458
459 if (info->xmit.buf)
460 free_page(page);
461 else
462 info->xmit.buf = (unsigned char *) page;
463
464#ifdef SERIAL_DEBUG_OPEN
465 printk("starting up ttys%d ...", info->line);
466#endif
467
468 /* Clear anything in the input buffer */
469
470 amiga_custom.intreq = IF_RBF;
471 mb();
472
473 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
474 if (retval) {
475 if (capable(CAP_SYS_ADMIN)) {
476 set_bit(TTY_IO_ERROR, &tty->flags);
477 retval = 0;
478 }
479 goto errout;
480 }
481
482 /* enable both Rx and Tx interrupts */
483 amiga_custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
484 mb();
485 info->IER = UART_IER_MSI;
486
487 /* remember current state of the DCD and CTS bits */
488 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
489
490 info->MCR = 0;
491 if (C_BAUD(tty))
492 info->MCR = SER_DTR | SER_RTS;
493 rtsdtr_ctrl(info->MCR);
494
495 clear_bit(TTY_IO_ERROR, &tty->flags);
496 info->xmit.head = info->xmit.tail = 0;
497
498 /*
499 * and set the speed of the serial port
500 */
501 change_speed(tty, info, NULL);
502
503 tty_port_set_initialized(port, true);
504 local_irq_restore(flags);
505 return 0;
506
507errout:
508 local_irq_restore(flags);
509 return retval;
510}
511
512/*
513 * This routine will shutdown a serial port; interrupts are disabled, and
514 * DTR is dropped if the hangup on close termio flag is on.
515 */
516static void shutdown(struct tty_struct *tty, struct serial_state *info)
517{
518 unsigned long flags;
519
520 if (!tty_port_initialized(&info->tport))
521 return;
522
523#ifdef SERIAL_DEBUG_OPEN
524 printk("Shutting down serial port %d ....\n", info->line);
525#endif
526
527 local_irq_save(flags); /* Disable interrupts */
528
529 /*
530 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
531 * here so the queue might never be waken up
532 */
533 wake_up_interruptible(&info->tport.delta_msr_wait);
534
535 /*
536 * Free the IRQ, if necessary
537 */
538 free_irq(IRQ_AMIGA_VERTB, info);
539
540 free_page((unsigned long)info->xmit.buf);
541 info->xmit.buf = NULL;
542
543 info->IER = 0;
544 amiga_custom.intena = IF_RBF | IF_TBE;
545 mb();
546
547 /* disable break condition */
548 amiga_custom.adkcon = AC_UARTBRK;
549 mb();
550
551 if (C_HUPCL(tty))
552 info->MCR &= ~(SER_DTR|SER_RTS);
553 rtsdtr_ctrl(info->MCR);
554
555 set_bit(TTY_IO_ERROR, &tty->flags);
556
557 tty_port_set_initialized(&info->tport, false);
558 local_irq_restore(flags);
559}
560
561
562/*
563 * This routine is called to set the UART divisor registers to match
564 * the specified baud rate for a serial port.
565 */
566static void change_speed(struct tty_struct *tty, struct serial_state *info,
567 const struct ktermios *old_termios)
568{
569 struct tty_port *port = &info->tport;
570 int quot = 0, baud_base, baud;
571 unsigned cflag, cval = 0;
572 int bits;
573 unsigned long flags;
574
575 cflag = tty->termios.c_cflag;
576
577 /* Byte size is always 8 bits plus parity bit if requested */
578
579 cval = 3; bits = 10;
580 if (cflag & CSTOPB) {
581 cval |= 0x04;
582 bits++;
583 }
584 if (cflag & PARENB) {
585 cval |= UART_LCR_PARITY;
586 bits++;
587 }
588 if (!(cflag & PARODD))
589 cval |= UART_LCR_EPAR;
590 if (cflag & CMSPAR)
591 cval |= UART_LCR_SPAR;
592
593 /* Determine divisor based on baud rate */
594 baud = tty_get_baud_rate(tty);
595 if (!baud)
596 baud = 9600; /* B0 transition handled in rs_set_termios */
597 baud_base = info->baud_base;
598 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
599 quot = info->custom_divisor;
600 else {
601 if (baud == 134)
602 /* Special case since 134 is really 134.5 */
603 quot = (2*baud_base / 269);
604 else if (baud)
605 quot = baud_base / baud;
606 }
607 /* If the quotient is zero refuse the change */
608 if (!quot && old_termios) {
609 /* FIXME: Will need updating for new tty in the end */
610 tty->termios.c_cflag &= ~CBAUD;
611 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
612 baud = tty_get_baud_rate(tty);
613 if (!baud)
614 baud = 9600;
615 if (baud == 38400 &&
616 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
617 quot = info->custom_divisor;
618 else {
619 if (baud == 134)
620 /* Special case since 134 is really 134.5 */
621 quot = (2*baud_base / 269);
622 else if (baud)
623 quot = baud_base / baud;
624 }
625 }
626 /* As a last resort, if the quotient is zero, default to 9600 bps */
627 if (!quot)
628 quot = baud_base / 9600;
629 info->quot = quot;
630 info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base;
631 info->timeout += HZ/50; /* Add .02 seconds of slop */
632
633 /* CTS flow control flag and modem status interrupts */
634 info->IER &= ~UART_IER_MSI;
635 if (port->flags & ASYNC_HARDPPS_CD)
636 info->IER |= UART_IER_MSI;
637 tty_port_set_cts_flow(port, cflag & CRTSCTS);
638 if (cflag & CRTSCTS)
639 info->IER |= UART_IER_MSI;
640 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
641 if (~cflag & CLOCAL)
642 info->IER |= UART_IER_MSI;
643 /* TBD:
644 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
645 */
646
647 /*
648 * Set up parity check flag
649 */
650
651 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
652 if (I_INPCK(tty))
653 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
654 if (I_BRKINT(tty) || I_PARMRK(tty))
655 info->read_status_mask |= UART_LSR_BI;
656
657 /*
658 * Characters to ignore
659 */
660 info->ignore_status_mask = 0;
661 if (I_IGNPAR(tty))
662 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
663 if (I_IGNBRK(tty)) {
664 info->ignore_status_mask |= UART_LSR_BI;
665 /*
666 * If we're ignore parity and break indicators, ignore
667 * overruns too. (For real raw support).
668 */
669 if (I_IGNPAR(tty))
670 info->ignore_status_mask |= UART_LSR_OE;
671 }
672 /*
673 * !!! ignore all characters if CREAD is not set
674 */
675 if ((cflag & CREAD) == 0)
676 info->ignore_status_mask |= UART_LSR_DR;
677 local_irq_save(flags);
678
679 {
680 short serper;
681
682 /* Set up the baud rate */
683 serper = quot - 1;
684
685 /* Enable or disable parity bit */
686
687 if(cval & UART_LCR_PARITY)
688 serper |= (SERPER_PARENB);
689
690 amiga_custom.serper = serper;
691 mb();
692 }
693
694 local_irq_restore(flags);
695}
696
697static int rs_put_char(struct tty_struct *tty, u8 ch)
698{
699 struct serial_state *info;
700 unsigned long flags;
701
702 info = tty->driver_data;
703
704 if (!info->xmit.buf)
705 return 0;
706
707 local_irq_save(flags);
708 if (CIRC_SPACE(info->xmit.head,
709 info->xmit.tail,
710 UART_XMIT_SIZE) == 0) {
711 local_irq_restore(flags);
712 return 0;
713 }
714
715 info->xmit.buf[info->xmit.head++] = ch;
716 info->xmit.head &= UART_XMIT_SIZE - 1;
717 local_irq_restore(flags);
718 return 1;
719}
720
721static void rs_flush_chars(struct tty_struct *tty)
722{
723 struct serial_state *info = tty->driver_data;
724 unsigned long flags;
725
726 if (info->xmit.head == info->xmit.tail
727 || tty->flow.stopped
728 || tty->hw_stopped
729 || !info->xmit.buf)
730 return;
731
732 local_irq_save(flags);
733 info->IER |= UART_IER_THRI;
734 amiga_custom.intena = IF_SETCLR | IF_TBE;
735 mb();
736 /* set a pending Tx Interrupt, transmitter should restart now */
737 amiga_custom.intreq = IF_SETCLR | IF_TBE;
738 mb();
739 local_irq_restore(flags);
740}
741
742static ssize_t rs_write(struct tty_struct * tty, const u8 *buf, size_t count)
743{
744 int c, ret = 0;
745 struct serial_state *info = tty->driver_data;
746 unsigned long flags;
747
748 if (!info->xmit.buf)
749 return 0;
750
751 local_irq_save(flags);
752 while (1) {
753 c = CIRC_SPACE_TO_END(info->xmit.head,
754 info->xmit.tail,
755 UART_XMIT_SIZE);
756 if (count < c)
757 c = count;
758 if (c <= 0) {
759 break;
760 }
761 memcpy(info->xmit.buf + info->xmit.head, buf, c);
762 info->xmit.head = (info->xmit.head + c) & (UART_XMIT_SIZE - 1);
763 buf += c;
764 count -= c;
765 ret += c;
766 }
767 local_irq_restore(flags);
768
769 if (info->xmit.head != info->xmit.tail
770 && !tty->flow.stopped
771 && !tty->hw_stopped
772 && !(info->IER & UART_IER_THRI)) {
773 info->IER |= UART_IER_THRI;
774 local_irq_disable();
775 amiga_custom.intena = IF_SETCLR | IF_TBE;
776 mb();
777 /* set a pending Tx Interrupt, transmitter should restart now */
778 amiga_custom.intreq = IF_SETCLR | IF_TBE;
779 mb();
780 local_irq_restore(flags);
781 }
782 return ret;
783}
784
785static unsigned int rs_write_room(struct tty_struct *tty)
786{
787 struct serial_state *info = tty->driver_data;
788
789 return CIRC_SPACE(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
790}
791
792static unsigned int rs_chars_in_buffer(struct tty_struct *tty)
793{
794 struct serial_state *info = tty->driver_data;
795
796 return CIRC_CNT(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
797}
798
799static void rs_flush_buffer(struct tty_struct *tty)
800{
801 struct serial_state *info = tty->driver_data;
802 unsigned long flags;
803
804 local_irq_save(flags);
805 info->xmit.head = info->xmit.tail = 0;
806 local_irq_restore(flags);
807 tty_wakeup(tty);
808}
809
810/*
811 * This function is used to send a high-priority XON/XOFF character to
812 * the device
813 */
814static void rs_send_xchar(struct tty_struct *tty, u8 ch)
815{
816 struct serial_state *info = tty->driver_data;
817 unsigned long flags;
818
819 info->x_char = ch;
820 if (ch) {
821 /* Make sure transmit interrupts are on */
822
823 /* Check this ! */
824 local_irq_save(flags);
825 if(!(amiga_custom.intenar & IF_TBE)) {
826 amiga_custom.intena = IF_SETCLR | IF_TBE;
827 mb();
828 /* set a pending Tx Interrupt, transmitter should restart now */
829 amiga_custom.intreq = IF_SETCLR | IF_TBE;
830 mb();
831 }
832 local_irq_restore(flags);
833
834 info->IER |= UART_IER_THRI;
835 }
836}
837
838/*
839 * ------------------------------------------------------------
840 * rs_throttle()
841 *
842 * This routine is called by the upper-layer tty layer to signal that
843 * incoming characters should be throttled.
844 * ------------------------------------------------------------
845 */
846static void rs_throttle(struct tty_struct * tty)
847{
848 struct serial_state *info = tty->driver_data;
849 unsigned long flags;
850#ifdef SERIAL_DEBUG_THROTTLE
851 printk("throttle %s ....\n", tty_name(tty));
852#endif
853
854 if (I_IXOFF(tty))
855 rs_send_xchar(tty, STOP_CHAR(tty));
856
857 if (C_CRTSCTS(tty))
858 info->MCR &= ~SER_RTS;
859
860 local_irq_save(flags);
861 rtsdtr_ctrl(info->MCR);
862 local_irq_restore(flags);
863}
864
865static void rs_unthrottle(struct tty_struct * tty)
866{
867 struct serial_state *info = tty->driver_data;
868 unsigned long flags;
869#ifdef SERIAL_DEBUG_THROTTLE
870 printk("unthrottle %s ....\n", tty_name(tty));
871#endif
872
873 if (I_IXOFF(tty)) {
874 if (info->x_char)
875 info->x_char = 0;
876 else
877 rs_send_xchar(tty, START_CHAR(tty));
878 }
879 if (C_CRTSCTS(tty))
880 info->MCR |= SER_RTS;
881 local_irq_save(flags);
882 rtsdtr_ctrl(info->MCR);
883 local_irq_restore(flags);
884}
885
886/*
887 * ------------------------------------------------------------
888 * rs_ioctl() and friends
889 * ------------------------------------------------------------
890 */
891
892static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
893{
894 struct serial_state *state = tty->driver_data;
895 unsigned int close_delay, closing_wait;
896
897 tty_lock(tty);
898 close_delay = jiffies_to_msecs(state->tport.close_delay) / 10;
899 closing_wait = state->tport.closing_wait;
900 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
901 closing_wait = jiffies_to_msecs(closing_wait) / 10;
902
903 ss->line = tty->index;
904 ss->port = state->port;
905 ss->flags = state->tport.flags;
906 ss->xmit_fifo_size = XMIT_FIFO_SIZE;
907 ss->baud_base = state->baud_base;
908 ss->close_delay = close_delay;
909 ss->closing_wait = closing_wait;
910 ss->custom_divisor = state->custom_divisor;
911 tty_unlock(tty);
912 return 0;
913}
914
915static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
916{
917 struct serial_state *state = tty->driver_data;
918 struct tty_port *port = &state->tport;
919 bool change_spd;
920 int retval = 0;
921 unsigned int close_delay, closing_wait;
922
923 tty_lock(tty);
924 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
925 ss->custom_divisor != state->custom_divisor;
926 if (ss->irq || ss->port != state->port ||
927 ss->xmit_fifo_size != XMIT_FIFO_SIZE) {
928 tty_unlock(tty);
929 return -EINVAL;
930 }
931
932 close_delay = msecs_to_jiffies(ss->close_delay * 10);
933 closing_wait = ss->closing_wait;
934 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
935 closing_wait = msecs_to_jiffies(closing_wait * 10);
936
937 if (!capable(CAP_SYS_ADMIN)) {
938 if ((ss->baud_base != state->baud_base) ||
939 (close_delay != port->close_delay) ||
940 (closing_wait != port->closing_wait) ||
941 ((ss->flags & ~ASYNC_USR_MASK) !=
942 (port->flags & ~ASYNC_USR_MASK))) {
943 tty_unlock(tty);
944 return -EPERM;
945 }
946 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
947 (ss->flags & ASYNC_USR_MASK));
948 state->custom_divisor = ss->custom_divisor;
949 goto check_and_exit;
950 }
951
952 if (ss->baud_base < 9600) {
953 tty_unlock(tty);
954 return -EINVAL;
955 }
956
957 /*
958 * OK, past this point, all the error checking has been done.
959 * At this point, we start making changes.....
960 */
961
962 state->baud_base = ss->baud_base;
963 port->flags = ((port->flags & ~ASYNC_FLAGS) |
964 (ss->flags & ASYNC_FLAGS));
965 state->custom_divisor = ss->custom_divisor;
966 port->close_delay = close_delay;
967 port->closing_wait = closing_wait;
968
969check_and_exit:
970 if (tty_port_initialized(port)) {
971 if (change_spd) {
972 /* warn about deprecation unless clearing */
973 if (ss->flags & ASYNC_SPD_MASK)
974 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
975 change_speed(tty, state, NULL);
976 }
977 } else
978 retval = startup(tty, state);
979 tty_unlock(tty);
980 return retval;
981}
982
983/*
984 * get_lsr_info - get line status register info
985 *
986 * Purpose: Let user call ioctl() to get info when the UART physically
987 * is emptied. On bus types like RS485, the transmitter must
988 * release the bus after transmitting. This must be done when
989 * the transmit shift register is empty, not be done when the
990 * transmit holding register is empty. This functionality
991 * allows an RS485 driver to be written in user space.
992 */
993static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
994{
995 unsigned char status;
996 unsigned int result;
997 unsigned long flags;
998
999 local_irq_save(flags);
1000 status = amiga_custom.serdatr;
1001 mb();
1002 local_irq_restore(flags);
1003 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1004 if (copy_to_user(value, &result, sizeof(int)))
1005 return -EFAULT;
1006 return 0;
1007}
1008
1009
1010static int rs_tiocmget(struct tty_struct *tty)
1011{
1012 struct serial_state *info = tty->driver_data;
1013 unsigned char control, status;
1014 unsigned long flags;
1015
1016 if (tty_io_error(tty))
1017 return -EIO;
1018
1019 control = info->MCR;
1020 local_irq_save(flags);
1021 status = ciab.pra;
1022 local_irq_restore(flags);
1023 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1024 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1025 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1026 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1027 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1028}
1029
1030static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1031 unsigned int clear)
1032{
1033 struct serial_state *info = tty->driver_data;
1034 unsigned long flags;
1035
1036 if (tty_io_error(tty))
1037 return -EIO;
1038
1039 local_irq_save(flags);
1040 if (set & TIOCM_RTS)
1041 info->MCR |= SER_RTS;
1042 if (set & TIOCM_DTR)
1043 info->MCR |= SER_DTR;
1044 if (clear & TIOCM_RTS)
1045 info->MCR &= ~SER_RTS;
1046 if (clear & TIOCM_DTR)
1047 info->MCR &= ~SER_DTR;
1048 rtsdtr_ctrl(info->MCR);
1049 local_irq_restore(flags);
1050 return 0;
1051}
1052
1053/*
1054 * rs_break() --- routine which turns the break handling on or off
1055 */
1056static int rs_break(struct tty_struct *tty, int break_state)
1057{
1058 unsigned long flags;
1059
1060 local_irq_save(flags);
1061 if (break_state == -1)
1062 amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK;
1063 else
1064 amiga_custom.adkcon = AC_UARTBRK;
1065 mb();
1066 local_irq_restore(flags);
1067 return 0;
1068}
1069
1070/*
1071 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1072 * Return: write counters to the user passed counter struct
1073 * NB: both 1->0 and 0->1 transitions are counted except for
1074 * RI where only 0->1 is counted.
1075 */
1076static int rs_get_icount(struct tty_struct *tty,
1077 struct serial_icounter_struct *icount)
1078{
1079 struct serial_state *info = tty->driver_data;
1080 struct async_icount cnow;
1081 unsigned long flags;
1082
1083 local_irq_save(flags);
1084 cnow = info->icount;
1085 local_irq_restore(flags);
1086 icount->cts = cnow.cts;
1087 icount->dsr = cnow.dsr;
1088 icount->rng = cnow.rng;
1089 icount->dcd = cnow.dcd;
1090 icount->rx = cnow.rx;
1091 icount->tx = cnow.tx;
1092 icount->frame = cnow.frame;
1093 icount->overrun = cnow.overrun;
1094 icount->parity = cnow.parity;
1095 icount->brk = cnow.brk;
1096 icount->buf_overrun = cnow.buf_overrun;
1097
1098 return 0;
1099}
1100
1101static int rs_ioctl(struct tty_struct *tty,
1102 unsigned int cmd, unsigned long arg)
1103{
1104 struct serial_state *info = tty->driver_data;
1105 struct async_icount cprev, cnow; /* kernel counter temps */
1106 void __user *argp = (void __user *)arg;
1107 unsigned long flags;
1108 DEFINE_WAIT(wait);
1109 int ret;
1110
1111 if ((cmd != TIOCSERCONFIG) &&
1112 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1113 if (tty_io_error(tty))
1114 return -EIO;
1115 }
1116
1117 switch (cmd) {
1118 case TIOCSERCONFIG:
1119 return 0;
1120
1121 case TIOCSERGETLSR: /* Get line status register */
1122 return get_lsr_info(info, argp);
1123
1124 /*
1125 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1126 * - mask passed in arg for lines of interest
1127 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1128 * Caller should use TIOCGICOUNT to see which one it was
1129 */
1130 case TIOCMIWAIT:
1131 local_irq_save(flags);
1132 /* note the counters on entry */
1133 cprev = info->icount;
1134 local_irq_restore(flags);
1135 while (1) {
1136 prepare_to_wait(&info->tport.delta_msr_wait,
1137 &wait, TASK_INTERRUPTIBLE);
1138 local_irq_save(flags);
1139 cnow = info->icount; /* atomic copy */
1140 local_irq_restore(flags);
1141 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1142 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1143 ret = -EIO; /* no change => error */
1144 break;
1145 }
1146 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1147 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1148 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1149 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1150 ret = 0;
1151 break;
1152 }
1153 schedule();
1154 /* see if a signal did it */
1155 if (signal_pending(current)) {
1156 ret = -ERESTARTSYS;
1157 break;
1158 }
1159 cprev = cnow;
1160 }
1161 finish_wait(&info->tport.delta_msr_wait, &wait);
1162 return ret;
1163
1164 default:
1165 return -ENOIOCTLCMD;
1166 }
1167 return 0;
1168}
1169
1170static void rs_set_termios(struct tty_struct *tty, const struct ktermios *old_termios)
1171{
1172 struct serial_state *info = tty->driver_data;
1173 unsigned long flags;
1174 unsigned int cflag = tty->termios.c_cflag;
1175
1176 change_speed(tty, info, old_termios);
1177
1178 /* Handle transition to B0 status */
1179 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1180 info->MCR &= ~(SER_DTR|SER_RTS);
1181 local_irq_save(flags);
1182 rtsdtr_ctrl(info->MCR);
1183 local_irq_restore(flags);
1184 }
1185
1186 /* Handle transition away from B0 status */
1187 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1188 info->MCR |= SER_DTR;
1189 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1190 info->MCR |= SER_RTS;
1191 local_irq_save(flags);
1192 rtsdtr_ctrl(info->MCR);
1193 local_irq_restore(flags);
1194 }
1195
1196 /* Handle turning off CRTSCTS */
1197 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1198 tty->hw_stopped = false;
1199 rs_start(tty);
1200 }
1201
1202#if 0
1203 /*
1204 * No need to wake up processes in open wait, since they
1205 * sample the CLOCAL flag once, and don't recheck it.
1206 * XXX It's not clear whether the current behavior is correct
1207 * or not. Hence, this may change.....
1208 */
1209 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1210 wake_up_interruptible(&info->open_wait);
1211#endif
1212}
1213
1214/*
1215 * ------------------------------------------------------------
1216 * rs_close()
1217 *
1218 * This routine is called when the serial port gets closed. First, we
1219 * wait for the last remaining data to be sent. Then, we unlink its
1220 * async structure from the interrupt chain if necessary, and we free
1221 * that IRQ if nothing is left in the chain.
1222 * ------------------------------------------------------------
1223 */
1224static void rs_close(struct tty_struct *tty, struct file * filp)
1225{
1226 struct serial_state *state = tty->driver_data;
1227 struct tty_port *port = &state->tport;
1228
1229 if (tty_port_close_start(port, tty, filp) == 0)
1230 return;
1231
1232 /*
1233 * At this point we stop accepting input. To do this, we
1234 * disable the receive line status interrupts, and tell the
1235 * interrupt driver to stop checking the data ready bit in the
1236 * line status register.
1237 */
1238 state->read_status_mask &= ~UART_LSR_DR;
1239 if (tty_port_initialized(port)) {
1240 /* disable receive interrupts */
1241 amiga_custom.intena = IF_RBF;
1242 mb();
1243 /* clear any pending receive interrupt */
1244 amiga_custom.intreq = IF_RBF;
1245 mb();
1246
1247 /*
1248 * Before we drop DTR, make sure the UART transmitter
1249 * has completely drained; this is especially
1250 * important if there is a transmit FIFO!
1251 */
1252 rs_wait_until_sent(tty, state->timeout);
1253 }
1254 shutdown(tty, state);
1255 rs_flush_buffer(tty);
1256
1257 tty_ldisc_flush(tty);
1258 port->tty = NULL;
1259
1260 tty_port_close_end(port, tty);
1261}
1262
1263/*
1264 * rs_wait_until_sent() --- wait until the transmitter is empty
1265 */
1266static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1267{
1268 struct serial_state *info = tty->driver_data;
1269 unsigned long orig_jiffies, char_time;
1270 int lsr;
1271
1272 orig_jiffies = jiffies;
1273
1274 /*
1275 * Set the check interval to be 1/5 of the estimated time to
1276 * send a single character, and make it at least 1. The check
1277 * interval should also be less than the timeout.
1278 *
1279 * Note: we have to use pretty tight timings here to satisfy
1280 * the NIST-PCTS.
1281 */
1282 char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE;
1283 char_time = char_time / 5;
1284 if (char_time == 0)
1285 char_time = 1;
1286 if (timeout)
1287 char_time = min_t(unsigned long, char_time, timeout);
1288 /*
1289 * If the transmitter hasn't cleared in twice the approximate
1290 * amount of time to send the entire FIFO, it probably won't
1291 * ever clear. This assumes the UART isn't doing flow
1292 * control, which is currently the case. Hence, if it ever
1293 * takes longer than info->timeout, this is probably due to a
1294 * UART bug of some kind. So, we clamp the timeout parameter at
1295 * 2*info->timeout.
1296 */
1297 if (!timeout || timeout > 2*info->timeout)
1298 timeout = 2*info->timeout;
1299#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1300 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1301 printk("jiff=%lu...", jiffies);
1302#endif
1303 while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) {
1304#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1305 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1306#endif
1307 msleep_interruptible(jiffies_to_msecs(char_time));
1308 if (signal_pending(current))
1309 break;
1310 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1311 break;
1312 }
1313 __set_current_state(TASK_RUNNING);
1314
1315#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1316 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1317#endif
1318}
1319
1320/*
1321 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1322 */
1323static void rs_hangup(struct tty_struct *tty)
1324{
1325 struct serial_state *info = tty->driver_data;
1326
1327 rs_flush_buffer(tty);
1328 shutdown(tty, info);
1329 info->tport.count = 0;
1330 tty_port_set_active(&info->tport, false);
1331 info->tport.tty = NULL;
1332 wake_up_interruptible(&info->tport.open_wait);
1333}
1334
1335/*
1336 * This routine is called whenever a serial port is opened. It
1337 * enables interrupts for a serial port, linking in its async structure into
1338 * the IRQ chain. It also performs the serial-specific
1339 * initialization for the tty structure.
1340 */
1341static int rs_open(struct tty_struct *tty, struct file * filp)
1342{
1343 struct tty_port *port = tty->port;
1344 struct serial_state *info = container_of(port, struct serial_state,
1345 tport);
1346 int retval;
1347
1348 port->count++;
1349 port->tty = tty;
1350 tty->driver_data = info;
1351
1352 retval = startup(tty, info);
1353 if (retval) {
1354 return retval;
1355 }
1356
1357 return tty_port_block_til_ready(port, tty, filp);
1358}
1359
1360/*
1361 * /proc fs routines....
1362 */
1363
1364static inline void line_info(struct seq_file *m, int line,
1365 struct serial_state *state)
1366{
1367 char stat_buf[30], control, status;
1368 unsigned long flags;
1369
1370 seq_printf(m, "%d: uart:amiga_builtin", line);
1371
1372 local_irq_save(flags);
1373 status = ciab.pra;
1374 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1375 local_irq_restore(flags);
1376
1377 stat_buf[0] = 0;
1378 stat_buf[1] = 0;
1379 if(!(control & SER_RTS))
1380 strcat(stat_buf, "|RTS");
1381 if(!(status & SER_CTS))
1382 strcat(stat_buf, "|CTS");
1383 if(!(control & SER_DTR))
1384 strcat(stat_buf, "|DTR");
1385 if(!(status & SER_DSR))
1386 strcat(stat_buf, "|DSR");
1387 if(!(status & SER_DCD))
1388 strcat(stat_buf, "|CD");
1389
1390 if (state->quot)
1391 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1392
1393 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1394
1395 if (state->icount.frame)
1396 seq_printf(m, " fe:%d", state->icount.frame);
1397
1398 if (state->icount.parity)
1399 seq_printf(m, " pe:%d", state->icount.parity);
1400
1401 if (state->icount.brk)
1402 seq_printf(m, " brk:%d", state->icount.brk);
1403
1404 if (state->icount.overrun)
1405 seq_printf(m, " oe:%d", state->icount.overrun);
1406
1407 /*
1408 * Last thing is the RS-232 status lines
1409 */
1410 seq_printf(m, " %s\n", stat_buf+1);
1411}
1412
1413static int rs_proc_show(struct seq_file *m, void *v)
1414{
1415 seq_printf(m, "serinfo:1.0 driver:4.30\n");
1416 line_info(m, 0, &serial_state);
1417 return 0;
1418}
1419
1420/*
1421 * ---------------------------------------------------------------------
1422 * rs_init() and friends
1423 *
1424 * rs_init() is called at boot-time to initialize the serial driver.
1425 * ---------------------------------------------------------------------
1426 */
1427
1428static const struct tty_operations serial_ops = {
1429 .open = rs_open,
1430 .close = rs_close,
1431 .write = rs_write,
1432 .put_char = rs_put_char,
1433 .flush_chars = rs_flush_chars,
1434 .write_room = rs_write_room,
1435 .chars_in_buffer = rs_chars_in_buffer,
1436 .flush_buffer = rs_flush_buffer,
1437 .ioctl = rs_ioctl,
1438 .throttle = rs_throttle,
1439 .unthrottle = rs_unthrottle,
1440 .set_termios = rs_set_termios,
1441 .stop = rs_stop,
1442 .start = rs_start,
1443 .hangup = rs_hangup,
1444 .break_ctl = rs_break,
1445 .send_xchar = rs_send_xchar,
1446 .wait_until_sent = rs_wait_until_sent,
1447 .tiocmget = rs_tiocmget,
1448 .tiocmset = rs_tiocmset,
1449 .get_icount = rs_get_icount,
1450 .set_serial = set_serial_info,
1451 .get_serial = get_serial_info,
1452 .proc_show = rs_proc_show,
1453};
1454
1455static bool amiga_carrier_raised(struct tty_port *port)
1456{
1457 return !(ciab.pra & SER_DCD);
1458}
1459
1460static void amiga_dtr_rts(struct tty_port *port, bool active)
1461{
1462 struct serial_state *info = container_of(port, struct serial_state,
1463 tport);
1464 unsigned long flags;
1465
1466 if (active)
1467 info->MCR |= SER_DTR|SER_RTS;
1468 else
1469 info->MCR &= ~(SER_DTR|SER_RTS);
1470
1471 local_irq_save(flags);
1472 rtsdtr_ctrl(info->MCR);
1473 local_irq_restore(flags);
1474}
1475
1476static const struct tty_port_operations amiga_port_ops = {
1477 .carrier_raised = amiga_carrier_raised,
1478 .dtr_rts = amiga_dtr_rts,
1479};
1480
1481/*
1482 * The serial driver boot-time initialization code!
1483 */
1484static int __init amiga_serial_probe(struct platform_device *pdev)
1485{
1486 struct serial_state *state = &serial_state;
1487 struct tty_driver *driver;
1488 unsigned long flags;
1489 int error;
1490
1491 driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
1492 if (IS_ERR(driver))
1493 return PTR_ERR(driver);
1494
1495 /* Initialize the tty_driver structure */
1496
1497 driver->driver_name = "amiserial";
1498 driver->name = "ttyS";
1499 driver->major = TTY_MAJOR;
1500 driver->minor_start = 64;
1501 driver->type = TTY_DRIVER_TYPE_SERIAL;
1502 driver->subtype = SERIAL_TYPE_NORMAL;
1503 driver->init_termios = tty_std_termios;
1504 driver->init_termios.c_cflag =
1505 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1506 tty_set_operations(driver, &serial_ops);
1507
1508 memset(state, 0, sizeof(*state));
1509 state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
1510 tty_port_init(&state->tport);
1511 state->tport.ops = &amiga_port_ops;
1512 tty_port_link_device(&state->tport, driver, 0);
1513
1514 error = tty_register_driver(driver);
1515 if (error)
1516 goto fail_tty_driver_kref_put;
1517
1518 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1519
1520 /* Hardware set up */
1521
1522 state->baud_base = amiga_colorclock;
1523
1524 /* set ISRs, and then disable the rx interrupts */
1525 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1526 if (error)
1527 goto fail_unregister;
1528
1529 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1530 "serial RX", state);
1531 if (error)
1532 goto fail_free_irq;
1533
1534 local_irq_save(flags);
1535
1536 /* turn off Rx and Tx interrupts */
1537 amiga_custom.intena = IF_RBF | IF_TBE;
1538 mb();
1539
1540 /* clear any pending interrupt */
1541 amiga_custom.intreq = IF_RBF | IF_TBE;
1542 mb();
1543
1544 local_irq_restore(flags);
1545
1546 /*
1547 * set the appropriate directions for the modem control flags,
1548 * and clear RTS and DTR
1549 */
1550 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1551 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1552
1553 platform_set_drvdata(pdev, state);
1554
1555 serial_driver = driver;
1556
1557 return 0;
1558
1559fail_free_irq:
1560 free_irq(IRQ_AMIGA_TBE, state);
1561fail_unregister:
1562 tty_unregister_driver(driver);
1563fail_tty_driver_kref_put:
1564 tty_port_destroy(&state->tport);
1565 tty_driver_kref_put(driver);
1566 return error;
1567}
1568
1569static int __exit amiga_serial_remove(struct platform_device *pdev)
1570{
1571 struct serial_state *state = platform_get_drvdata(pdev);
1572
1573 tty_unregister_driver(serial_driver);
1574 tty_driver_kref_put(serial_driver);
1575 tty_port_destroy(&state->tport);
1576
1577 free_irq(IRQ_AMIGA_TBE, state);
1578 free_irq(IRQ_AMIGA_RBF, state);
1579
1580 return 0;
1581}
1582
1583static struct platform_driver amiga_serial_driver = {
1584 .remove = __exit_p(amiga_serial_remove),
1585 .driver = {
1586 .name = "amiga-serial",
1587 },
1588};
1589
1590module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1591
1592
1593#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1594
1595/*
1596 * ------------------------------------------------------------
1597 * Serial console driver
1598 * ------------------------------------------------------------
1599 */
1600
1601static void amiga_serial_putc(char c)
1602{
1603 amiga_custom.serdat = (unsigned char)c | 0x100;
1604 while (!(amiga_custom.serdatr & 0x2000))
1605 barrier();
1606}
1607
1608/*
1609 * Print a string to the serial port trying not to disturb
1610 * any possible real use of the port...
1611 *
1612 * The console must be locked when we get here.
1613 */
1614static void serial_console_write(struct console *co, const char *s,
1615 unsigned count)
1616{
1617 unsigned short intena = amiga_custom.intenar;
1618
1619 amiga_custom.intena = IF_TBE;
1620
1621 while (count--) {
1622 if (*s == '\n')
1623 amiga_serial_putc('\r');
1624 amiga_serial_putc(*s++);
1625 }
1626
1627 amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
1628}
1629
1630static struct tty_driver *serial_console_device(struct console *c, int *index)
1631{
1632 *index = 0;
1633 return serial_driver;
1634}
1635
1636static struct console sercons = {
1637 .name = "ttyS",
1638 .write = serial_console_write,
1639 .device = serial_console_device,
1640 .flags = CON_PRINTBUFFER,
1641 .index = -1,
1642};
1643
1644/*
1645 * Register console.
1646 */
1647static int __init amiserial_console_init(void)
1648{
1649 if (!MACH_IS_AMIGA)
1650 return -ENODEV;
1651
1652 register_console(&sercons);
1653 return 0;
1654}
1655console_initcall(amiserial_console_init);
1656
1657#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1658
1659MODULE_LICENSE("GPL");
1660MODULE_ALIAS("platform:amiga-serial");
1/*
2 * Serial driver for the amiga builtin port.
3 *
4 * This code was created by taking serial.c version 4.30 from kernel
5 * release 2.3.22, replacing all hardware related stuff with the
6 * corresponding amiga hardware actions, and removing all irrelevant
7 * code. As a consequence, it uses many of the constants and names
8 * associated with the registers and bits of 16550 compatible UARTS -
9 * but only to keep track of status, etc in the state variables. It
10 * was done this was to make it easier to keep the code in line with
11 * (non hardware specific) changes to serial.c.
12 *
13 * The port is registered with the tty driver as minor device 64, and
14 * therefore other ports should should only use 65 upwards.
15 *
16 * Richard Lucock 28/12/99
17 *
18 * Copyright (C) 1991, 1992 Linus Torvalds
19 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
20 * 1998, 1999 Theodore Ts'o
21 *
22 */
23
24/*
25 * Serial driver configuration section. Here are the various options:
26 *
27 * SERIAL_PARANOIA_CHECK
28 * Check the magic number for the async_structure where
29 * ever possible.
30 */
31
32#include <linux/delay.h>
33
34#undef SERIAL_PARANOIA_CHECK
35
36/* Set of debugging defines */
37
38#undef SERIAL_DEBUG_INTR
39#undef SERIAL_DEBUG_OPEN
40#undef SERIAL_DEBUG_FLOW
41#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
42
43/* Sanity checks */
44
45#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
46#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
47 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
48#else
49#define DBG_CNT(s)
50#endif
51
52/*
53 * End of serial driver configuration section.
54 */
55
56#include <linux/module.h>
57
58#include <linux/types.h>
59#include <linux/serial.h>
60#include <linux/serial_reg.h>
61static char *serial_version = "4.30";
62
63#include <linux/errno.h>
64#include <linux/signal.h>
65#include <linux/sched.h>
66#include <linux/kernel.h>
67#include <linux/timer.h>
68#include <linux/interrupt.h>
69#include <linux/tty.h>
70#include <linux/tty_flip.h>
71#include <linux/circ_buf.h>
72#include <linux/console.h>
73#include <linux/major.h>
74#include <linux/string.h>
75#include <linux/fcntl.h>
76#include <linux/ptrace.h>
77#include <linux/ioport.h>
78#include <linux/mm.h>
79#include <linux/seq_file.h>
80#include <linux/slab.h>
81#include <linux/init.h>
82#include <linux/bitops.h>
83#include <linux/platform_device.h>
84
85#include <asm/setup.h>
86
87
88#include <asm/irq.h>
89
90#include <asm/amigahw.h>
91#include <asm/amigaints.h>
92
93struct serial_state {
94 struct tty_port tport;
95 struct circ_buf xmit;
96 struct async_icount icount;
97
98 unsigned long port;
99 int baud_base;
100 int xmit_fifo_size;
101 int custom_divisor;
102 int read_status_mask;
103 int ignore_status_mask;
104 int timeout;
105 int quot;
106 int IER; /* Interrupt Enable Register */
107 int MCR; /* Modem control register */
108 int x_char; /* xon/xoff character */
109};
110
111#define custom amiga_custom
112static char *serial_name = "Amiga-builtin serial driver";
113
114static struct tty_driver *serial_driver;
115
116/* number of characters left in xmit buffer before we ask for more */
117#define WAKEUP_CHARS 256
118
119static unsigned char current_ctl_bits;
120
121static void change_speed(struct tty_struct *tty, struct serial_state *info,
122 struct ktermios *old);
123static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
124
125
126static struct serial_state rs_table[1];
127
128#define NR_PORTS ARRAY_SIZE(rs_table)
129
130#include <asm/uaccess.h>
131
132#define serial_isroot() (capable(CAP_SYS_ADMIN))
133
134
135static inline int serial_paranoia_check(struct serial_state *info,
136 char *name, const char *routine)
137{
138#ifdef SERIAL_PARANOIA_CHECK
139 static const char *badmagic =
140 "Warning: bad magic number for serial struct (%s) in %s\n";
141 static const char *badinfo =
142 "Warning: null async_struct for (%s) in %s\n";
143
144 if (!info) {
145 printk(badinfo, name, routine);
146 return 1;
147 }
148 if (info->magic != SERIAL_MAGIC) {
149 printk(badmagic, name, routine);
150 return 1;
151 }
152#endif
153 return 0;
154}
155
156/* some serial hardware definitions */
157#define SDR_OVRUN (1<<15)
158#define SDR_RBF (1<<14)
159#define SDR_TBE (1<<13)
160#define SDR_TSRE (1<<12)
161
162#define SERPER_PARENB (1<<15)
163
164#define AC_SETCLR (1<<15)
165#define AC_UARTBRK (1<<11)
166
167#define SER_DTR (1<<7)
168#define SER_RTS (1<<6)
169#define SER_DCD (1<<5)
170#define SER_CTS (1<<4)
171#define SER_DSR (1<<3)
172
173static __inline__ void rtsdtr_ctrl(int bits)
174{
175 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
176}
177
178/*
179 * ------------------------------------------------------------
180 * rs_stop() and rs_start()
181 *
182 * This routines are called before setting or resetting tty->stopped.
183 * They enable or disable transmitter interrupts, as necessary.
184 * ------------------------------------------------------------
185 */
186static void rs_stop(struct tty_struct *tty)
187{
188 struct serial_state *info = tty->driver_data;
189 unsigned long flags;
190
191 if (serial_paranoia_check(info, tty->name, "rs_stop"))
192 return;
193
194 local_irq_save(flags);
195 if (info->IER & UART_IER_THRI) {
196 info->IER &= ~UART_IER_THRI;
197 /* disable Tx interrupt and remove any pending interrupts */
198 custom.intena = IF_TBE;
199 mb();
200 custom.intreq = IF_TBE;
201 mb();
202 }
203 local_irq_restore(flags);
204}
205
206static void rs_start(struct tty_struct *tty)
207{
208 struct serial_state *info = tty->driver_data;
209 unsigned long flags;
210
211 if (serial_paranoia_check(info, tty->name, "rs_start"))
212 return;
213
214 local_irq_save(flags);
215 if (info->xmit.head != info->xmit.tail
216 && info->xmit.buf
217 && !(info->IER & UART_IER_THRI)) {
218 info->IER |= UART_IER_THRI;
219 custom.intena = IF_SETCLR | IF_TBE;
220 mb();
221 /* set a pending Tx Interrupt, transmitter should restart now */
222 custom.intreq = IF_SETCLR | IF_TBE;
223 mb();
224 }
225 local_irq_restore(flags);
226}
227
228/*
229 * ----------------------------------------------------------------------
230 *
231 * Here starts the interrupt handling routines. All of the following
232 * subroutines are declared as inline and are folded into
233 * rs_interrupt(). They were separated out for readability's sake.
234 *
235 * Note: rs_interrupt() is a "fast" interrupt, which means that it
236 * runs with interrupts turned off. People who may want to modify
237 * rs_interrupt() should try to keep the interrupt handler as fast as
238 * possible. After you are done making modifications, it is not a bad
239 * idea to do:
240 *
241 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
242 *
243 * and look at the resulting assemble code in serial.s.
244 *
245 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
246 * -----------------------------------------------------------------------
247 */
248
249static void receive_chars(struct serial_state *info)
250{
251 int status;
252 int serdatr;
253 unsigned char ch, flag;
254 struct async_icount *icount;
255 int oe = 0;
256
257 icount = &info->icount;
258
259 status = UART_LSR_DR; /* We obviously have a character! */
260 serdatr = custom.serdatr;
261 mb();
262 custom.intreq = IF_RBF;
263 mb();
264
265 if((serdatr & 0x1ff) == 0)
266 status |= UART_LSR_BI;
267 if(serdatr & SDR_OVRUN)
268 status |= UART_LSR_OE;
269
270 ch = serdatr & 0xff;
271 icount->rx++;
272
273#ifdef SERIAL_DEBUG_INTR
274 printk("DR%02x:%02x...", ch, status);
275#endif
276 flag = TTY_NORMAL;
277
278 /*
279 * We don't handle parity or frame errors - but I have left
280 * the code in, since I'm not sure that the errors can't be
281 * detected.
282 */
283
284 if (status & (UART_LSR_BI | UART_LSR_PE |
285 UART_LSR_FE | UART_LSR_OE)) {
286 /*
287 * For statistics only
288 */
289 if (status & UART_LSR_BI) {
290 status &= ~(UART_LSR_FE | UART_LSR_PE);
291 icount->brk++;
292 } else if (status & UART_LSR_PE)
293 icount->parity++;
294 else if (status & UART_LSR_FE)
295 icount->frame++;
296 if (status & UART_LSR_OE)
297 icount->overrun++;
298
299 /*
300 * Now check to see if character should be
301 * ignored, and mask off conditions which
302 * should be ignored.
303 */
304 if (status & info->ignore_status_mask)
305 goto out;
306
307 status &= info->read_status_mask;
308
309 if (status & (UART_LSR_BI)) {
310#ifdef SERIAL_DEBUG_INTR
311 printk("handling break....");
312#endif
313 flag = TTY_BREAK;
314 if (info->tport.flags & ASYNC_SAK)
315 do_SAK(info->tport.tty);
316 } else if (status & UART_LSR_PE)
317 flag = TTY_PARITY;
318 else if (status & UART_LSR_FE)
319 flag = TTY_FRAME;
320 if (status & UART_LSR_OE) {
321 /*
322 * Overrun is special, since it's
323 * reported immediately, and doesn't
324 * affect the current character
325 */
326 oe = 1;
327 }
328 }
329 tty_insert_flip_char(&info->tport, ch, flag);
330 if (oe == 1)
331 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
332 tty_flip_buffer_push(&info->tport);
333out:
334 return;
335}
336
337static void transmit_chars(struct serial_state *info)
338{
339 custom.intreq = IF_TBE;
340 mb();
341 if (info->x_char) {
342 custom.serdat = info->x_char | 0x100;
343 mb();
344 info->icount.tx++;
345 info->x_char = 0;
346 return;
347 }
348 if (info->xmit.head == info->xmit.tail
349 || info->tport.tty->stopped
350 || info->tport.tty->hw_stopped) {
351 info->IER &= ~UART_IER_THRI;
352 custom.intena = IF_TBE;
353 mb();
354 return;
355 }
356
357 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
358 mb();
359 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
360 info->icount.tx++;
361
362 if (CIRC_CNT(info->xmit.head,
363 info->xmit.tail,
364 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
365 tty_wakeup(info->tport.tty);
366
367#ifdef SERIAL_DEBUG_INTR
368 printk("THRE...");
369#endif
370 if (info->xmit.head == info->xmit.tail) {
371 custom.intena = IF_TBE;
372 mb();
373 info->IER &= ~UART_IER_THRI;
374 }
375}
376
377static void check_modem_status(struct serial_state *info)
378{
379 struct tty_port *port = &info->tport;
380 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
381 unsigned char dstatus;
382 struct async_icount *icount;
383
384 /* Determine bits that have changed */
385 dstatus = status ^ current_ctl_bits;
386 current_ctl_bits = status;
387
388 if (dstatus) {
389 icount = &info->icount;
390 /* update input line counters */
391 if (dstatus & SER_DSR)
392 icount->dsr++;
393 if (dstatus & SER_DCD) {
394 icount->dcd++;
395 }
396 if (dstatus & SER_CTS)
397 icount->cts++;
398 wake_up_interruptible(&port->delta_msr_wait);
399 }
400
401 if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
402#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
403 printk("ttyS%d CD now %s...", info->line,
404 (!(status & SER_DCD)) ? "on" : "off");
405#endif
406 if (!(status & SER_DCD))
407 wake_up_interruptible(&port->open_wait);
408 else {
409#ifdef SERIAL_DEBUG_OPEN
410 printk("doing serial hangup...");
411#endif
412 if (port->tty)
413 tty_hangup(port->tty);
414 }
415 }
416 if (tty_port_cts_enabled(port)) {
417 if (port->tty->hw_stopped) {
418 if (!(status & SER_CTS)) {
419#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
420 printk("CTS tx start...");
421#endif
422 port->tty->hw_stopped = 0;
423 info->IER |= UART_IER_THRI;
424 custom.intena = IF_SETCLR | IF_TBE;
425 mb();
426 /* set a pending Tx Interrupt, transmitter should restart now */
427 custom.intreq = IF_SETCLR | IF_TBE;
428 mb();
429 tty_wakeup(port->tty);
430 return;
431 }
432 } else {
433 if ((status & SER_CTS)) {
434#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
435 printk("CTS tx stop...");
436#endif
437 port->tty->hw_stopped = 1;
438 info->IER &= ~UART_IER_THRI;
439 /* disable Tx interrupt and remove any pending interrupts */
440 custom.intena = IF_TBE;
441 mb();
442 custom.intreq = IF_TBE;
443 mb();
444 }
445 }
446 }
447}
448
449static irqreturn_t ser_vbl_int( int irq, void *data)
450{
451 /* vbl is just a periodic interrupt we tie into to update modem status */
452 struct serial_state *info = data;
453 /*
454 * TBD - is it better to unregister from this interrupt or to
455 * ignore it if MSI is clear ?
456 */
457 if(info->IER & UART_IER_MSI)
458 check_modem_status(info);
459 return IRQ_HANDLED;
460}
461
462static irqreturn_t ser_rx_int(int irq, void *dev_id)
463{
464 struct serial_state *info = dev_id;
465
466#ifdef SERIAL_DEBUG_INTR
467 printk("ser_rx_int...");
468#endif
469
470 if (!info->tport.tty)
471 return IRQ_NONE;
472
473 receive_chars(info);
474#ifdef SERIAL_DEBUG_INTR
475 printk("end.\n");
476#endif
477 return IRQ_HANDLED;
478}
479
480static irqreturn_t ser_tx_int(int irq, void *dev_id)
481{
482 struct serial_state *info = dev_id;
483
484 if (custom.serdatr & SDR_TBE) {
485#ifdef SERIAL_DEBUG_INTR
486 printk("ser_tx_int...");
487#endif
488
489 if (!info->tport.tty)
490 return IRQ_NONE;
491
492 transmit_chars(info);
493#ifdef SERIAL_DEBUG_INTR
494 printk("end.\n");
495#endif
496 }
497 return IRQ_HANDLED;
498}
499
500/*
501 * -------------------------------------------------------------------
502 * Here ends the serial interrupt routines.
503 * -------------------------------------------------------------------
504 */
505
506/*
507 * ---------------------------------------------------------------
508 * Low level utility subroutines for the serial driver: routines to
509 * figure out the appropriate timeout for an interrupt chain, routines
510 * to initialize and startup a serial port, and routines to shutdown a
511 * serial port. Useful stuff like that.
512 * ---------------------------------------------------------------
513 */
514
515static int startup(struct tty_struct *tty, struct serial_state *info)
516{
517 struct tty_port *port = &info->tport;
518 unsigned long flags;
519 int retval=0;
520 unsigned long page;
521
522 page = get_zeroed_page(GFP_KERNEL);
523 if (!page)
524 return -ENOMEM;
525
526 local_irq_save(flags);
527
528 if (port->flags & ASYNC_INITIALIZED) {
529 free_page(page);
530 goto errout;
531 }
532
533 if (info->xmit.buf)
534 free_page(page);
535 else
536 info->xmit.buf = (unsigned char *) page;
537
538#ifdef SERIAL_DEBUG_OPEN
539 printk("starting up ttys%d ...", info->line);
540#endif
541
542 /* Clear anything in the input buffer */
543
544 custom.intreq = IF_RBF;
545 mb();
546
547 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
548 if (retval) {
549 if (serial_isroot()) {
550 set_bit(TTY_IO_ERROR, &tty->flags);
551 retval = 0;
552 }
553 goto errout;
554 }
555
556 /* enable both Rx and Tx interrupts */
557 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
558 mb();
559 info->IER = UART_IER_MSI;
560
561 /* remember current state of the DCD and CTS bits */
562 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
563
564 info->MCR = 0;
565 if (C_BAUD(tty))
566 info->MCR = SER_DTR | SER_RTS;
567 rtsdtr_ctrl(info->MCR);
568
569 clear_bit(TTY_IO_ERROR, &tty->flags);
570 info->xmit.head = info->xmit.tail = 0;
571
572 /*
573 * Set up the tty->alt_speed kludge
574 */
575 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
576 tty->alt_speed = 57600;
577 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
578 tty->alt_speed = 115200;
579 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
580 tty->alt_speed = 230400;
581 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
582 tty->alt_speed = 460800;
583
584 /*
585 * and set the speed of the serial port
586 */
587 change_speed(tty, info, NULL);
588
589 port->flags |= ASYNC_INITIALIZED;
590 local_irq_restore(flags);
591 return 0;
592
593errout:
594 local_irq_restore(flags);
595 return retval;
596}
597
598/*
599 * This routine will shutdown a serial port; interrupts are disabled, and
600 * DTR is dropped if the hangup on close termio flag is on.
601 */
602static void shutdown(struct tty_struct *tty, struct serial_state *info)
603{
604 unsigned long flags;
605 struct serial_state *state;
606
607 if (!(info->tport.flags & ASYNC_INITIALIZED))
608 return;
609
610 state = info;
611
612#ifdef SERIAL_DEBUG_OPEN
613 printk("Shutting down serial port %d ....\n", info->line);
614#endif
615
616 local_irq_save(flags); /* Disable interrupts */
617
618 /*
619 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
620 * here so the queue might never be waken up
621 */
622 wake_up_interruptible(&info->tport.delta_msr_wait);
623
624 /*
625 * Free the IRQ, if necessary
626 */
627 free_irq(IRQ_AMIGA_VERTB, info);
628
629 if (info->xmit.buf) {
630 free_page((unsigned long) info->xmit.buf);
631 info->xmit.buf = NULL;
632 }
633
634 info->IER = 0;
635 custom.intena = IF_RBF | IF_TBE;
636 mb();
637
638 /* disable break condition */
639 custom.adkcon = AC_UARTBRK;
640 mb();
641
642 if (C_HUPCL(tty))
643 info->MCR &= ~(SER_DTR|SER_RTS);
644 rtsdtr_ctrl(info->MCR);
645
646 set_bit(TTY_IO_ERROR, &tty->flags);
647
648 info->tport.flags &= ~ASYNC_INITIALIZED;
649 local_irq_restore(flags);
650}
651
652
653/*
654 * This routine is called to set the UART divisor registers to match
655 * the specified baud rate for a serial port.
656 */
657static void change_speed(struct tty_struct *tty, struct serial_state *info,
658 struct ktermios *old_termios)
659{
660 struct tty_port *port = &info->tport;
661 int quot = 0, baud_base, baud;
662 unsigned cflag, cval = 0;
663 int bits;
664 unsigned long flags;
665
666 cflag = tty->termios.c_cflag;
667
668 /* Byte size is always 8 bits plus parity bit if requested */
669
670 cval = 3; bits = 10;
671 if (cflag & CSTOPB) {
672 cval |= 0x04;
673 bits++;
674 }
675 if (cflag & PARENB) {
676 cval |= UART_LCR_PARITY;
677 bits++;
678 }
679 if (!(cflag & PARODD))
680 cval |= UART_LCR_EPAR;
681#ifdef CMSPAR
682 if (cflag & CMSPAR)
683 cval |= UART_LCR_SPAR;
684#endif
685
686 /* Determine divisor based on baud rate */
687 baud = tty_get_baud_rate(tty);
688 if (!baud)
689 baud = 9600; /* B0 transition handled in rs_set_termios */
690 baud_base = info->baud_base;
691 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
692 quot = info->custom_divisor;
693 else {
694 if (baud == 134)
695 /* Special case since 134 is really 134.5 */
696 quot = (2*baud_base / 269);
697 else if (baud)
698 quot = baud_base / baud;
699 }
700 /* If the quotient is zero refuse the change */
701 if (!quot && old_termios) {
702 /* FIXME: Will need updating for new tty in the end */
703 tty->termios.c_cflag &= ~CBAUD;
704 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
705 baud = tty_get_baud_rate(tty);
706 if (!baud)
707 baud = 9600;
708 if (baud == 38400 &&
709 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
710 quot = info->custom_divisor;
711 else {
712 if (baud == 134)
713 /* Special case since 134 is really 134.5 */
714 quot = (2*baud_base / 269);
715 else if (baud)
716 quot = baud_base / baud;
717 }
718 }
719 /* As a last resort, if the quotient is zero, default to 9600 bps */
720 if (!quot)
721 quot = baud_base / 9600;
722 info->quot = quot;
723 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
724 info->timeout += HZ/50; /* Add .02 seconds of slop */
725
726 /* CTS flow control flag and modem status interrupts */
727 info->IER &= ~UART_IER_MSI;
728 if (port->flags & ASYNC_HARDPPS_CD)
729 info->IER |= UART_IER_MSI;
730 if (cflag & CRTSCTS) {
731 port->flags |= ASYNC_CTS_FLOW;
732 info->IER |= UART_IER_MSI;
733 } else
734 port->flags &= ~ASYNC_CTS_FLOW;
735 if (cflag & CLOCAL)
736 port->flags &= ~ASYNC_CHECK_CD;
737 else {
738 port->flags |= ASYNC_CHECK_CD;
739 info->IER |= UART_IER_MSI;
740 }
741 /* TBD:
742 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
743 */
744
745 /*
746 * Set up parity check flag
747 */
748
749 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
750 if (I_INPCK(tty))
751 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
752 if (I_BRKINT(tty) || I_PARMRK(tty))
753 info->read_status_mask |= UART_LSR_BI;
754
755 /*
756 * Characters to ignore
757 */
758 info->ignore_status_mask = 0;
759 if (I_IGNPAR(tty))
760 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
761 if (I_IGNBRK(tty)) {
762 info->ignore_status_mask |= UART_LSR_BI;
763 /*
764 * If we're ignore parity and break indicators, ignore
765 * overruns too. (For real raw support).
766 */
767 if (I_IGNPAR(tty))
768 info->ignore_status_mask |= UART_LSR_OE;
769 }
770 /*
771 * !!! ignore all characters if CREAD is not set
772 */
773 if ((cflag & CREAD) == 0)
774 info->ignore_status_mask |= UART_LSR_DR;
775 local_irq_save(flags);
776
777 {
778 short serper;
779
780 /* Set up the baud rate */
781 serper = quot - 1;
782
783 /* Enable or disable parity bit */
784
785 if(cval & UART_LCR_PARITY)
786 serper |= (SERPER_PARENB);
787
788 custom.serper = serper;
789 mb();
790 }
791
792 local_irq_restore(flags);
793}
794
795static int rs_put_char(struct tty_struct *tty, unsigned char ch)
796{
797 struct serial_state *info;
798 unsigned long flags;
799
800 info = tty->driver_data;
801
802 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
803 return 0;
804
805 if (!info->xmit.buf)
806 return 0;
807
808 local_irq_save(flags);
809 if (CIRC_SPACE(info->xmit.head,
810 info->xmit.tail,
811 SERIAL_XMIT_SIZE) == 0) {
812 local_irq_restore(flags);
813 return 0;
814 }
815
816 info->xmit.buf[info->xmit.head++] = ch;
817 info->xmit.head &= SERIAL_XMIT_SIZE-1;
818 local_irq_restore(flags);
819 return 1;
820}
821
822static void rs_flush_chars(struct tty_struct *tty)
823{
824 struct serial_state *info = tty->driver_data;
825 unsigned long flags;
826
827 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
828 return;
829
830 if (info->xmit.head == info->xmit.tail
831 || tty->stopped
832 || tty->hw_stopped
833 || !info->xmit.buf)
834 return;
835
836 local_irq_save(flags);
837 info->IER |= UART_IER_THRI;
838 custom.intena = IF_SETCLR | IF_TBE;
839 mb();
840 /* set a pending Tx Interrupt, transmitter should restart now */
841 custom.intreq = IF_SETCLR | IF_TBE;
842 mb();
843 local_irq_restore(flags);
844}
845
846static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
847{
848 int c, ret = 0;
849 struct serial_state *info = tty->driver_data;
850 unsigned long flags;
851
852 if (serial_paranoia_check(info, tty->name, "rs_write"))
853 return 0;
854
855 if (!info->xmit.buf)
856 return 0;
857
858 local_irq_save(flags);
859 while (1) {
860 c = CIRC_SPACE_TO_END(info->xmit.head,
861 info->xmit.tail,
862 SERIAL_XMIT_SIZE);
863 if (count < c)
864 c = count;
865 if (c <= 0) {
866 break;
867 }
868 memcpy(info->xmit.buf + info->xmit.head, buf, c);
869 info->xmit.head = ((info->xmit.head + c) &
870 (SERIAL_XMIT_SIZE-1));
871 buf += c;
872 count -= c;
873 ret += c;
874 }
875 local_irq_restore(flags);
876
877 if (info->xmit.head != info->xmit.tail
878 && !tty->stopped
879 && !tty->hw_stopped
880 && !(info->IER & UART_IER_THRI)) {
881 info->IER |= UART_IER_THRI;
882 local_irq_disable();
883 custom.intena = IF_SETCLR | IF_TBE;
884 mb();
885 /* set a pending Tx Interrupt, transmitter should restart now */
886 custom.intreq = IF_SETCLR | IF_TBE;
887 mb();
888 local_irq_restore(flags);
889 }
890 return ret;
891}
892
893static int rs_write_room(struct tty_struct *tty)
894{
895 struct serial_state *info = tty->driver_data;
896
897 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
898 return 0;
899 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
900}
901
902static int rs_chars_in_buffer(struct tty_struct *tty)
903{
904 struct serial_state *info = tty->driver_data;
905
906 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
907 return 0;
908 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
909}
910
911static void rs_flush_buffer(struct tty_struct *tty)
912{
913 struct serial_state *info = tty->driver_data;
914 unsigned long flags;
915
916 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
917 return;
918 local_irq_save(flags);
919 info->xmit.head = info->xmit.tail = 0;
920 local_irq_restore(flags);
921 tty_wakeup(tty);
922}
923
924/*
925 * This function is used to send a high-priority XON/XOFF character to
926 * the device
927 */
928static void rs_send_xchar(struct tty_struct *tty, char ch)
929{
930 struct serial_state *info = tty->driver_data;
931 unsigned long flags;
932
933 if (serial_paranoia_check(info, tty->name, "rs_send_xchar"))
934 return;
935
936 info->x_char = ch;
937 if (ch) {
938 /* Make sure transmit interrupts are on */
939
940 /* Check this ! */
941 local_irq_save(flags);
942 if(!(custom.intenar & IF_TBE)) {
943 custom.intena = IF_SETCLR | IF_TBE;
944 mb();
945 /* set a pending Tx Interrupt, transmitter should restart now */
946 custom.intreq = IF_SETCLR | IF_TBE;
947 mb();
948 }
949 local_irq_restore(flags);
950
951 info->IER |= UART_IER_THRI;
952 }
953}
954
955/*
956 * ------------------------------------------------------------
957 * rs_throttle()
958 *
959 * This routine is called by the upper-layer tty layer to signal that
960 * incoming characters should be throttled.
961 * ------------------------------------------------------------
962 */
963static void rs_throttle(struct tty_struct * tty)
964{
965 struct serial_state *info = tty->driver_data;
966 unsigned long flags;
967#ifdef SERIAL_DEBUG_THROTTLE
968 printk("throttle %s ....\n", tty_name(tty));
969#endif
970
971 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
972 return;
973
974 if (I_IXOFF(tty))
975 rs_send_xchar(tty, STOP_CHAR(tty));
976
977 if (C_CRTSCTS(tty))
978 info->MCR &= ~SER_RTS;
979
980 local_irq_save(flags);
981 rtsdtr_ctrl(info->MCR);
982 local_irq_restore(flags);
983}
984
985static void rs_unthrottle(struct tty_struct * tty)
986{
987 struct serial_state *info = tty->driver_data;
988 unsigned long flags;
989#ifdef SERIAL_DEBUG_THROTTLE
990 printk("unthrottle %s ....\n", tty_name(tty));
991#endif
992
993 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
994 return;
995
996 if (I_IXOFF(tty)) {
997 if (info->x_char)
998 info->x_char = 0;
999 else
1000 rs_send_xchar(tty, START_CHAR(tty));
1001 }
1002 if (C_CRTSCTS(tty))
1003 info->MCR |= SER_RTS;
1004 local_irq_save(flags);
1005 rtsdtr_ctrl(info->MCR);
1006 local_irq_restore(flags);
1007}
1008
1009/*
1010 * ------------------------------------------------------------
1011 * rs_ioctl() and friends
1012 * ------------------------------------------------------------
1013 */
1014
1015static int get_serial_info(struct tty_struct *tty, struct serial_state *state,
1016 struct serial_struct __user * retinfo)
1017{
1018 struct serial_struct tmp;
1019
1020 if (!retinfo)
1021 return -EFAULT;
1022 memset(&tmp, 0, sizeof(tmp));
1023 tty_lock(tty);
1024 tmp.line = tty->index;
1025 tmp.port = state->port;
1026 tmp.flags = state->tport.flags;
1027 tmp.xmit_fifo_size = state->xmit_fifo_size;
1028 tmp.baud_base = state->baud_base;
1029 tmp.close_delay = state->tport.close_delay;
1030 tmp.closing_wait = state->tport.closing_wait;
1031 tmp.custom_divisor = state->custom_divisor;
1032 tty_unlock(tty);
1033 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1034 return -EFAULT;
1035 return 0;
1036}
1037
1038static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
1039 struct serial_struct __user * new_info)
1040{
1041 struct tty_port *port = &state->tport;
1042 struct serial_struct new_serial;
1043 bool change_spd;
1044 int retval = 0;
1045
1046 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1047 return -EFAULT;
1048
1049 tty_lock(tty);
1050 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
1051 new_serial.custom_divisor != state->custom_divisor;
1052 if (new_serial.irq || new_serial.port != state->port ||
1053 new_serial.xmit_fifo_size != state->xmit_fifo_size) {
1054 tty_unlock(tty);
1055 return -EINVAL;
1056 }
1057
1058 if (!serial_isroot()) {
1059 if ((new_serial.baud_base != state->baud_base) ||
1060 (new_serial.close_delay != port->close_delay) ||
1061 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1062 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1063 (port->flags & ~ASYNC_USR_MASK))) {
1064 tty_unlock(tty);
1065 return -EPERM;
1066 }
1067 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1068 (new_serial.flags & ASYNC_USR_MASK));
1069 state->custom_divisor = new_serial.custom_divisor;
1070 goto check_and_exit;
1071 }
1072
1073 if (new_serial.baud_base < 9600) {
1074 tty_unlock(tty);
1075 return -EINVAL;
1076 }
1077
1078 /*
1079 * OK, past this point, all the error checking has been done.
1080 * At this point, we start making changes.....
1081 */
1082
1083 state->baud_base = new_serial.baud_base;
1084 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1085 (new_serial.flags & ASYNC_FLAGS));
1086 state->custom_divisor = new_serial.custom_divisor;
1087 port->close_delay = new_serial.close_delay * HZ/100;
1088 port->closing_wait = new_serial.closing_wait * HZ/100;
1089 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1090
1091check_and_exit:
1092 if (port->flags & ASYNC_INITIALIZED) {
1093 if (change_spd) {
1094 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1095 tty->alt_speed = 57600;
1096 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1097 tty->alt_speed = 115200;
1098 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1099 tty->alt_speed = 230400;
1100 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1101 tty->alt_speed = 460800;
1102 change_speed(tty, state, NULL);
1103 }
1104 } else
1105 retval = startup(tty, state);
1106 tty_unlock(tty);
1107 return retval;
1108}
1109
1110
1111/*
1112 * get_lsr_info - get line status register info
1113 *
1114 * Purpose: Let user call ioctl() to get info when the UART physically
1115 * is emptied. On bus types like RS485, the transmitter must
1116 * release the bus after transmitting. This must be done when
1117 * the transmit shift register is empty, not be done when the
1118 * transmit holding register is empty. This functionality
1119 * allows an RS485 driver to be written in user space.
1120 */
1121static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1122{
1123 unsigned char status;
1124 unsigned int result;
1125 unsigned long flags;
1126
1127 local_irq_save(flags);
1128 status = custom.serdatr;
1129 mb();
1130 local_irq_restore(flags);
1131 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1132 if (copy_to_user(value, &result, sizeof(int)))
1133 return -EFAULT;
1134 return 0;
1135}
1136
1137
1138static int rs_tiocmget(struct tty_struct *tty)
1139{
1140 struct serial_state *info = tty->driver_data;
1141 unsigned char control, status;
1142 unsigned long flags;
1143
1144 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1145 return -ENODEV;
1146 if (tty->flags & (1 << TTY_IO_ERROR))
1147 return -EIO;
1148
1149 control = info->MCR;
1150 local_irq_save(flags);
1151 status = ciab.pra;
1152 local_irq_restore(flags);
1153 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1154 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1155 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1156 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1157 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1158}
1159
1160static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1161 unsigned int clear)
1162{
1163 struct serial_state *info = tty->driver_data;
1164 unsigned long flags;
1165
1166 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1167 return -ENODEV;
1168 if (tty->flags & (1 << TTY_IO_ERROR))
1169 return -EIO;
1170
1171 local_irq_save(flags);
1172 if (set & TIOCM_RTS)
1173 info->MCR |= SER_RTS;
1174 if (set & TIOCM_DTR)
1175 info->MCR |= SER_DTR;
1176 if (clear & TIOCM_RTS)
1177 info->MCR &= ~SER_RTS;
1178 if (clear & TIOCM_DTR)
1179 info->MCR &= ~SER_DTR;
1180 rtsdtr_ctrl(info->MCR);
1181 local_irq_restore(flags);
1182 return 0;
1183}
1184
1185/*
1186 * rs_break() --- routine which turns the break handling on or off
1187 */
1188static int rs_break(struct tty_struct *tty, int break_state)
1189{
1190 struct serial_state *info = tty->driver_data;
1191 unsigned long flags;
1192
1193 if (serial_paranoia_check(info, tty->name, "rs_break"))
1194 return -EINVAL;
1195
1196 local_irq_save(flags);
1197 if (break_state == -1)
1198 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1199 else
1200 custom.adkcon = AC_UARTBRK;
1201 mb();
1202 local_irq_restore(flags);
1203 return 0;
1204}
1205
1206/*
1207 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1208 * Return: write counters to the user passed counter struct
1209 * NB: both 1->0 and 0->1 transitions are counted except for
1210 * RI where only 0->1 is counted.
1211 */
1212static int rs_get_icount(struct tty_struct *tty,
1213 struct serial_icounter_struct *icount)
1214{
1215 struct serial_state *info = tty->driver_data;
1216 struct async_icount cnow;
1217 unsigned long flags;
1218
1219 local_irq_save(flags);
1220 cnow = info->icount;
1221 local_irq_restore(flags);
1222 icount->cts = cnow.cts;
1223 icount->dsr = cnow.dsr;
1224 icount->rng = cnow.rng;
1225 icount->dcd = cnow.dcd;
1226 icount->rx = cnow.rx;
1227 icount->tx = cnow.tx;
1228 icount->frame = cnow.frame;
1229 icount->overrun = cnow.overrun;
1230 icount->parity = cnow.parity;
1231 icount->brk = cnow.brk;
1232 icount->buf_overrun = cnow.buf_overrun;
1233
1234 return 0;
1235}
1236
1237static int rs_ioctl(struct tty_struct *tty,
1238 unsigned int cmd, unsigned long arg)
1239{
1240 struct serial_state *info = tty->driver_data;
1241 struct async_icount cprev, cnow; /* kernel counter temps */
1242 void __user *argp = (void __user *)arg;
1243 unsigned long flags;
1244 DEFINE_WAIT(wait);
1245 int ret;
1246
1247 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1248 return -ENODEV;
1249
1250 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1251 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1252 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1253 if (tty->flags & (1 << TTY_IO_ERROR))
1254 return -EIO;
1255 }
1256
1257 switch (cmd) {
1258 case TIOCGSERIAL:
1259 return get_serial_info(tty, info, argp);
1260 case TIOCSSERIAL:
1261 return set_serial_info(tty, info, argp);
1262 case TIOCSERCONFIG:
1263 return 0;
1264
1265 case TIOCSERGETLSR: /* Get line status register */
1266 return get_lsr_info(info, argp);
1267
1268 case TIOCSERGSTRUCT:
1269 if (copy_to_user(argp,
1270 info, sizeof(struct serial_state)))
1271 return -EFAULT;
1272 return 0;
1273
1274 /*
1275 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1276 * - mask passed in arg for lines of interest
1277 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1278 * Caller should use TIOCGICOUNT to see which one it was
1279 */
1280 case TIOCMIWAIT:
1281 local_irq_save(flags);
1282 /* note the counters on entry */
1283 cprev = info->icount;
1284 local_irq_restore(flags);
1285 while (1) {
1286 prepare_to_wait(&info->tport.delta_msr_wait,
1287 &wait, TASK_INTERRUPTIBLE);
1288 local_irq_save(flags);
1289 cnow = info->icount; /* atomic copy */
1290 local_irq_restore(flags);
1291 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1292 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1293 ret = -EIO; /* no change => error */
1294 break;
1295 }
1296 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1297 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1298 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1299 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1300 ret = 0;
1301 break;
1302 }
1303 schedule();
1304 /* see if a signal did it */
1305 if (signal_pending(current)) {
1306 ret = -ERESTARTSYS;
1307 break;
1308 }
1309 cprev = cnow;
1310 }
1311 finish_wait(&info->tport.delta_msr_wait, &wait);
1312 return ret;
1313
1314 case TIOCSERGWILD:
1315 case TIOCSERSWILD:
1316 /* "setserial -W" is called in Debian boot */
1317 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1318 return 0;
1319
1320 default:
1321 return -ENOIOCTLCMD;
1322 }
1323 return 0;
1324}
1325
1326static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1327{
1328 struct serial_state *info = tty->driver_data;
1329 unsigned long flags;
1330 unsigned int cflag = tty->termios.c_cflag;
1331
1332 change_speed(tty, info, old_termios);
1333
1334 /* Handle transition to B0 status */
1335 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1336 info->MCR &= ~(SER_DTR|SER_RTS);
1337 local_irq_save(flags);
1338 rtsdtr_ctrl(info->MCR);
1339 local_irq_restore(flags);
1340 }
1341
1342 /* Handle transition away from B0 status */
1343 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1344 info->MCR |= SER_DTR;
1345 if (!C_CRTSCTS(tty) || !test_bit(TTY_THROTTLED, &tty->flags))
1346 info->MCR |= SER_RTS;
1347 local_irq_save(flags);
1348 rtsdtr_ctrl(info->MCR);
1349 local_irq_restore(flags);
1350 }
1351
1352 /* Handle turning off CRTSCTS */
1353 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1354 tty->hw_stopped = 0;
1355 rs_start(tty);
1356 }
1357
1358#if 0
1359 /*
1360 * No need to wake up processes in open wait, since they
1361 * sample the CLOCAL flag once, and don't recheck it.
1362 * XXX It's not clear whether the current behavior is correct
1363 * or not. Hence, this may change.....
1364 */
1365 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1366 wake_up_interruptible(&info->open_wait);
1367#endif
1368}
1369
1370/*
1371 * ------------------------------------------------------------
1372 * rs_close()
1373 *
1374 * This routine is called when the serial port gets closed. First, we
1375 * wait for the last remaining data to be sent. Then, we unlink its
1376 * async structure from the interrupt chain if necessary, and we free
1377 * that IRQ if nothing is left in the chain.
1378 * ------------------------------------------------------------
1379 */
1380static void rs_close(struct tty_struct *tty, struct file * filp)
1381{
1382 struct serial_state *state = tty->driver_data;
1383 struct tty_port *port = &state->tport;
1384
1385 if (serial_paranoia_check(state, tty->name, "rs_close"))
1386 return;
1387
1388 if (tty_port_close_start(port, tty, filp) == 0)
1389 return;
1390
1391 /*
1392 * At this point we stop accepting input. To do this, we
1393 * disable the receive line status interrupts, and tell the
1394 * interrupt driver to stop checking the data ready bit in the
1395 * line status register.
1396 */
1397 state->read_status_mask &= ~UART_LSR_DR;
1398 if (port->flags & ASYNC_INITIALIZED) {
1399 /* disable receive interrupts */
1400 custom.intena = IF_RBF;
1401 mb();
1402 /* clear any pending receive interrupt */
1403 custom.intreq = IF_RBF;
1404 mb();
1405
1406 /*
1407 * Before we drop DTR, make sure the UART transmitter
1408 * has completely drained; this is especially
1409 * important if there is a transmit FIFO!
1410 */
1411 rs_wait_until_sent(tty, state->timeout);
1412 }
1413 shutdown(tty, state);
1414 rs_flush_buffer(tty);
1415
1416 tty_ldisc_flush(tty);
1417 port->tty = NULL;
1418
1419 tty_port_close_end(port, tty);
1420}
1421
1422/*
1423 * rs_wait_until_sent() --- wait until the transmitter is empty
1424 */
1425static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1426{
1427 struct serial_state *info = tty->driver_data;
1428 unsigned long orig_jiffies, char_time;
1429 int lsr;
1430
1431 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1432 return;
1433
1434 if (info->xmit_fifo_size == 0)
1435 return; /* Just in case.... */
1436
1437 orig_jiffies = jiffies;
1438
1439 /*
1440 * Set the check interval to be 1/5 of the estimated time to
1441 * send a single character, and make it at least 1. The check
1442 * interval should also be less than the timeout.
1443 *
1444 * Note: we have to use pretty tight timings here to satisfy
1445 * the NIST-PCTS.
1446 */
1447 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1448 char_time = char_time / 5;
1449 if (char_time == 0)
1450 char_time = 1;
1451 if (timeout)
1452 char_time = min_t(unsigned long, char_time, timeout);
1453 /*
1454 * If the transmitter hasn't cleared in twice the approximate
1455 * amount of time to send the entire FIFO, it probably won't
1456 * ever clear. This assumes the UART isn't doing flow
1457 * control, which is currently the case. Hence, if it ever
1458 * takes longer than info->timeout, this is probably due to a
1459 * UART bug of some kind. So, we clamp the timeout parameter at
1460 * 2*info->timeout.
1461 */
1462 if (!timeout || timeout > 2*info->timeout)
1463 timeout = 2*info->timeout;
1464#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1465 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1466 printk("jiff=%lu...", jiffies);
1467#endif
1468 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1469#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1470 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1471#endif
1472 msleep_interruptible(jiffies_to_msecs(char_time));
1473 if (signal_pending(current))
1474 break;
1475 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1476 break;
1477 }
1478 __set_current_state(TASK_RUNNING);
1479
1480#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1481 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1482#endif
1483}
1484
1485/*
1486 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1487 */
1488static void rs_hangup(struct tty_struct *tty)
1489{
1490 struct serial_state *info = tty->driver_data;
1491
1492 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1493 return;
1494
1495 rs_flush_buffer(tty);
1496 shutdown(tty, info);
1497 info->tport.count = 0;
1498 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
1499 info->tport.tty = NULL;
1500 wake_up_interruptible(&info->tport.open_wait);
1501}
1502
1503/*
1504 * This routine is called whenever a serial port is opened. It
1505 * enables interrupts for a serial port, linking in its async structure into
1506 * the IRQ chain. It also performs the serial-specific
1507 * initialization for the tty structure.
1508 */
1509static int rs_open(struct tty_struct *tty, struct file * filp)
1510{
1511 struct serial_state *info = rs_table + tty->index;
1512 struct tty_port *port = &info->tport;
1513 int retval;
1514
1515 port->count++;
1516 port->tty = tty;
1517 tty->driver_data = info;
1518 tty->port = port;
1519 if (serial_paranoia_check(info, tty->name, "rs_open"))
1520 return -ENODEV;
1521
1522 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1523
1524 retval = startup(tty, info);
1525 if (retval) {
1526 return retval;
1527 }
1528
1529 return tty_port_block_til_ready(port, tty, filp);
1530}
1531
1532/*
1533 * /proc fs routines....
1534 */
1535
1536static inline void line_info(struct seq_file *m, int line,
1537 struct serial_state *state)
1538{
1539 char stat_buf[30], control, status;
1540 unsigned long flags;
1541
1542 seq_printf(m, "%d: uart:amiga_builtin", line);
1543
1544 local_irq_save(flags);
1545 status = ciab.pra;
1546 control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status;
1547 local_irq_restore(flags);
1548
1549 stat_buf[0] = 0;
1550 stat_buf[1] = 0;
1551 if(!(control & SER_RTS))
1552 strcat(stat_buf, "|RTS");
1553 if(!(status & SER_CTS))
1554 strcat(stat_buf, "|CTS");
1555 if(!(control & SER_DTR))
1556 strcat(stat_buf, "|DTR");
1557 if(!(status & SER_DSR))
1558 strcat(stat_buf, "|DSR");
1559 if(!(status & SER_DCD))
1560 strcat(stat_buf, "|CD");
1561
1562 if (state->quot)
1563 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1564
1565 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1566
1567 if (state->icount.frame)
1568 seq_printf(m, " fe:%d", state->icount.frame);
1569
1570 if (state->icount.parity)
1571 seq_printf(m, " pe:%d", state->icount.parity);
1572
1573 if (state->icount.brk)
1574 seq_printf(m, " brk:%d", state->icount.brk);
1575
1576 if (state->icount.overrun)
1577 seq_printf(m, " oe:%d", state->icount.overrun);
1578
1579 /*
1580 * Last thing is the RS-232 status lines
1581 */
1582 seq_printf(m, " %s\n", stat_buf+1);
1583}
1584
1585static int rs_proc_show(struct seq_file *m, void *v)
1586{
1587 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1588 line_info(m, 0, &rs_table[0]);
1589 return 0;
1590}
1591
1592static int rs_proc_open(struct inode *inode, struct file *file)
1593{
1594 return single_open(file, rs_proc_show, NULL);
1595}
1596
1597static const struct file_operations rs_proc_fops = {
1598 .owner = THIS_MODULE,
1599 .open = rs_proc_open,
1600 .read = seq_read,
1601 .llseek = seq_lseek,
1602 .release = single_release,
1603};
1604
1605/*
1606 * ---------------------------------------------------------------------
1607 * rs_init() and friends
1608 *
1609 * rs_init() is called at boot-time to initialize the serial driver.
1610 * ---------------------------------------------------------------------
1611 */
1612
1613/*
1614 * This routine prints out the appropriate serial driver version
1615 * number, and identifies which options were configured into this
1616 * driver.
1617 */
1618static void show_serial_version(void)
1619{
1620 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1621}
1622
1623
1624static const struct tty_operations serial_ops = {
1625 .open = rs_open,
1626 .close = rs_close,
1627 .write = rs_write,
1628 .put_char = rs_put_char,
1629 .flush_chars = rs_flush_chars,
1630 .write_room = rs_write_room,
1631 .chars_in_buffer = rs_chars_in_buffer,
1632 .flush_buffer = rs_flush_buffer,
1633 .ioctl = rs_ioctl,
1634 .throttle = rs_throttle,
1635 .unthrottle = rs_unthrottle,
1636 .set_termios = rs_set_termios,
1637 .stop = rs_stop,
1638 .start = rs_start,
1639 .hangup = rs_hangup,
1640 .break_ctl = rs_break,
1641 .send_xchar = rs_send_xchar,
1642 .wait_until_sent = rs_wait_until_sent,
1643 .tiocmget = rs_tiocmget,
1644 .tiocmset = rs_tiocmset,
1645 .get_icount = rs_get_icount,
1646 .proc_fops = &rs_proc_fops,
1647};
1648
1649static int amiga_carrier_raised(struct tty_port *port)
1650{
1651 return !(ciab.pra & SER_DCD);
1652}
1653
1654static void amiga_dtr_rts(struct tty_port *port, int raise)
1655{
1656 struct serial_state *info = container_of(port, struct serial_state,
1657 tport);
1658 unsigned long flags;
1659
1660 if (raise)
1661 info->MCR |= SER_DTR|SER_RTS;
1662 else
1663 info->MCR &= ~(SER_DTR|SER_RTS);
1664
1665 local_irq_save(flags);
1666 rtsdtr_ctrl(info->MCR);
1667 local_irq_restore(flags);
1668}
1669
1670static const struct tty_port_operations amiga_port_ops = {
1671 .carrier_raised = amiga_carrier_raised,
1672 .dtr_rts = amiga_dtr_rts,
1673};
1674
1675/*
1676 * The serial driver boot-time initialization code!
1677 */
1678static int __init amiga_serial_probe(struct platform_device *pdev)
1679{
1680 unsigned long flags;
1681 struct serial_state * state;
1682 int error;
1683
1684 serial_driver = alloc_tty_driver(NR_PORTS);
1685 if (!serial_driver)
1686 return -ENOMEM;
1687
1688 show_serial_version();
1689
1690 /* Initialize the tty_driver structure */
1691
1692 serial_driver->driver_name = "amiserial";
1693 serial_driver->name = "ttyS";
1694 serial_driver->major = TTY_MAJOR;
1695 serial_driver->minor_start = 64;
1696 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1697 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1698 serial_driver->init_termios = tty_std_termios;
1699 serial_driver->init_termios.c_cflag =
1700 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1701 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1702 tty_set_operations(serial_driver, &serial_ops);
1703
1704 state = rs_table;
1705 state->port = (int)&custom.serdatr; /* Just to give it a value */
1706 state->custom_divisor = 0;
1707 state->icount.cts = state->icount.dsr =
1708 state->icount.rng = state->icount.dcd = 0;
1709 state->icount.rx = state->icount.tx = 0;
1710 state->icount.frame = state->icount.parity = 0;
1711 state->icount.overrun = state->icount.brk = 0;
1712 tty_port_init(&state->tport);
1713 state->tport.ops = &amiga_port_ops;
1714 tty_port_link_device(&state->tport, serial_driver, 0);
1715
1716 error = tty_register_driver(serial_driver);
1717 if (error)
1718 goto fail_put_tty_driver;
1719
1720 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1721
1722 /* Hardware set up */
1723
1724 state->baud_base = amiga_colorclock;
1725 state->xmit_fifo_size = 1;
1726
1727 /* set ISRs, and then disable the rx interrupts */
1728 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1729 if (error)
1730 goto fail_unregister;
1731
1732 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1733 "serial RX", state);
1734 if (error)
1735 goto fail_free_irq;
1736
1737 local_irq_save(flags);
1738
1739 /* turn off Rx and Tx interrupts */
1740 custom.intena = IF_RBF | IF_TBE;
1741 mb();
1742
1743 /* clear any pending interrupt */
1744 custom.intreq = IF_RBF | IF_TBE;
1745 mb();
1746
1747 local_irq_restore(flags);
1748
1749 /*
1750 * set the appropriate directions for the modem control flags,
1751 * and clear RTS and DTR
1752 */
1753 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1754 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1755
1756 platform_set_drvdata(pdev, state);
1757
1758 return 0;
1759
1760fail_free_irq:
1761 free_irq(IRQ_AMIGA_TBE, state);
1762fail_unregister:
1763 tty_unregister_driver(serial_driver);
1764fail_put_tty_driver:
1765 tty_port_destroy(&state->tport);
1766 put_tty_driver(serial_driver);
1767 return error;
1768}
1769
1770static int __exit amiga_serial_remove(struct platform_device *pdev)
1771{
1772 int error;
1773 struct serial_state *state = platform_get_drvdata(pdev);
1774
1775 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1776 error = tty_unregister_driver(serial_driver);
1777 if (error)
1778 printk("SERIAL: failed to unregister serial driver (%d)\n",
1779 error);
1780 put_tty_driver(serial_driver);
1781 tty_port_destroy(&state->tport);
1782
1783 free_irq(IRQ_AMIGA_TBE, state);
1784 free_irq(IRQ_AMIGA_RBF, state);
1785
1786 return error;
1787}
1788
1789static struct platform_driver amiga_serial_driver = {
1790 .remove = __exit_p(amiga_serial_remove),
1791 .driver = {
1792 .name = "amiga-serial",
1793 },
1794};
1795
1796module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1797
1798
1799#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1800
1801/*
1802 * ------------------------------------------------------------
1803 * Serial console driver
1804 * ------------------------------------------------------------
1805 */
1806
1807static void amiga_serial_putc(char c)
1808{
1809 custom.serdat = (unsigned char)c | 0x100;
1810 while (!(custom.serdatr & 0x2000))
1811 barrier();
1812}
1813
1814/*
1815 * Print a string to the serial port trying not to disturb
1816 * any possible real use of the port...
1817 *
1818 * The console must be locked when we get here.
1819 */
1820static void serial_console_write(struct console *co, const char *s,
1821 unsigned count)
1822{
1823 unsigned short intena = custom.intenar;
1824
1825 custom.intena = IF_TBE;
1826
1827 while (count--) {
1828 if (*s == '\n')
1829 amiga_serial_putc('\r');
1830 amiga_serial_putc(*s++);
1831 }
1832
1833 custom.intena = IF_SETCLR | (intena & IF_TBE);
1834}
1835
1836static struct tty_driver *serial_console_device(struct console *c, int *index)
1837{
1838 *index = 0;
1839 return serial_driver;
1840}
1841
1842static struct console sercons = {
1843 .name = "ttyS",
1844 .write = serial_console_write,
1845 .device = serial_console_device,
1846 .flags = CON_PRINTBUFFER,
1847 .index = -1,
1848};
1849
1850/*
1851 * Register console.
1852 */
1853static int __init amiserial_console_init(void)
1854{
1855 if (!MACH_IS_AMIGA)
1856 return -ENODEV;
1857
1858 register_console(&sercons);
1859 return 0;
1860}
1861console_initcall(amiserial_console_init);
1862
1863#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1864
1865MODULE_LICENSE("GPL");
1866MODULE_ALIAS("platform:amiga-serial");