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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#define SERIAL_DO_RESTART
36
37/* Set of debugging defines */
38
39#undef SERIAL_DEBUG_INTR
40#undef SERIAL_DEBUG_OPEN
41#undef SERIAL_DEBUG_FLOW
42#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
43
44/* Sanity checks */
45
46#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
47#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
48 tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
49#else
50#define DBG_CNT(s)
51#endif
52
53/*
54 * End of serial driver configuration section.
55 */
56
57#include <linux/module.h>
58
59#include <linux/types.h>
60#include <linux/serial.h>
61#include <linux/serialP.h>
62#include <linux/serial_reg.h>
63static char *serial_version = "4.30";
64
65#include <linux/errno.h>
66#include <linux/signal.h>
67#include <linux/sched.h>
68#include <linux/kernel.h>
69#include <linux/timer.h>
70#include <linux/interrupt.h>
71#include <linux/tty.h>
72#include <linux/tty_flip.h>
73#include <linux/console.h>
74#include <linux/major.h>
75#include <linux/string.h>
76#include <linux/fcntl.h>
77#include <linux/ptrace.h>
78#include <linux/ioport.h>
79#include <linux/mm.h>
80#include <linux/seq_file.h>
81#include <linux/slab.h>
82#include <linux/init.h>
83#include <linux/bitops.h>
84#include <linux/platform_device.h>
85
86#include <asm/setup.h>
87
88#include <asm/system.h>
89
90#include <asm/irq.h>
91
92#include <asm/amigahw.h>
93#include <asm/amigaints.h>
94
95#define custom amiga_custom
96static char *serial_name = "Amiga-builtin serial driver";
97
98static struct tty_driver *serial_driver;
99
100/* number of characters left in xmit buffer before we ask for more */
101#define WAKEUP_CHARS 256
102
103static struct async_struct *IRQ_ports;
104
105static unsigned char current_ctl_bits;
106
107static void change_speed(struct async_struct *info, struct ktermios *old);
108static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
109
110
111static struct serial_state rs_table[1];
112
113#define NR_PORTS ARRAY_SIZE(rs_table)
114
115#include <asm/uaccess.h>
116
117#define serial_isroot() (capable(CAP_SYS_ADMIN))
118
119
120static inline int serial_paranoia_check(struct async_struct *info,
121 char *name, const char *routine)
122{
123#ifdef SERIAL_PARANOIA_CHECK
124 static const char *badmagic =
125 "Warning: bad magic number for serial struct (%s) in %s\n";
126 static const char *badinfo =
127 "Warning: null async_struct for (%s) in %s\n";
128
129 if (!info) {
130 printk(badinfo, name, routine);
131 return 1;
132 }
133 if (info->magic != SERIAL_MAGIC) {
134 printk(badmagic, name, routine);
135 return 1;
136 }
137#endif
138 return 0;
139}
140
141/* some serial hardware definitions */
142#define SDR_OVRUN (1<<15)
143#define SDR_RBF (1<<14)
144#define SDR_TBE (1<<13)
145#define SDR_TSRE (1<<12)
146
147#define SERPER_PARENB (1<<15)
148
149#define AC_SETCLR (1<<15)
150#define AC_UARTBRK (1<<11)
151
152#define SER_DTR (1<<7)
153#define SER_RTS (1<<6)
154#define SER_DCD (1<<5)
155#define SER_CTS (1<<4)
156#define SER_DSR (1<<3)
157
158static __inline__ void rtsdtr_ctrl(int bits)
159{
160 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
161}
162
163/*
164 * ------------------------------------------------------------
165 * rs_stop() and rs_start()
166 *
167 * This routines are called before setting or resetting tty->stopped.
168 * They enable or disable transmitter interrupts, as necessary.
169 * ------------------------------------------------------------
170 */
171static void rs_stop(struct tty_struct *tty)
172{
173 struct async_struct *info = tty->driver_data;
174 unsigned long flags;
175
176 if (serial_paranoia_check(info, tty->name, "rs_stop"))
177 return;
178
179 local_irq_save(flags);
180 if (info->IER & UART_IER_THRI) {
181 info->IER &= ~UART_IER_THRI;
182 /* disable Tx interrupt and remove any pending interrupts */
183 custom.intena = IF_TBE;
184 mb();
185 custom.intreq = IF_TBE;
186 mb();
187 }
188 local_irq_restore(flags);
189}
190
191static void rs_start(struct tty_struct *tty)
192{
193 struct async_struct *info = tty->driver_data;
194 unsigned long flags;
195
196 if (serial_paranoia_check(info, tty->name, "rs_start"))
197 return;
198
199 local_irq_save(flags);
200 if (info->xmit.head != info->xmit.tail
201 && info->xmit.buf
202 && !(info->IER & UART_IER_THRI)) {
203 info->IER |= UART_IER_THRI;
204 custom.intena = IF_SETCLR | IF_TBE;
205 mb();
206 /* set a pending Tx Interrupt, transmitter should restart now */
207 custom.intreq = IF_SETCLR | IF_TBE;
208 mb();
209 }
210 local_irq_restore(flags);
211}
212
213/*
214 * ----------------------------------------------------------------------
215 *
216 * Here starts the interrupt handling routines. All of the following
217 * subroutines are declared as inline and are folded into
218 * rs_interrupt(). They were separated out for readability's sake.
219 *
220 * Note: rs_interrupt() is a "fast" interrupt, which means that it
221 * runs with interrupts turned off. People who may want to modify
222 * rs_interrupt() should try to keep the interrupt handler as fast as
223 * possible. After you are done making modifications, it is not a bad
224 * idea to do:
225 *
226 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
227 *
228 * and look at the resulting assemble code in serial.s.
229 *
230 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
231 * -----------------------------------------------------------------------
232 */
233
234/*
235 * This routine is used by the interrupt handler to schedule
236 * processing in the software interrupt portion of the driver.
237 */
238static void rs_sched_event(struct async_struct *info,
239 int event)
240{
241 info->event |= 1 << event;
242 tasklet_schedule(&info->tlet);
243}
244
245static void receive_chars(struct async_struct *info)
246{
247 int status;
248 int serdatr;
249 struct tty_struct *tty = info->tty;
250 unsigned char ch, flag;
251 struct async_icount *icount;
252 int oe = 0;
253
254 icount = &info->state->icount;
255
256 status = UART_LSR_DR; /* We obviously have a character! */
257 serdatr = custom.serdatr;
258 mb();
259 custom.intreq = IF_RBF;
260 mb();
261
262 if((serdatr & 0x1ff) == 0)
263 status |= UART_LSR_BI;
264 if(serdatr & SDR_OVRUN)
265 status |= UART_LSR_OE;
266
267 ch = serdatr & 0xff;
268 icount->rx++;
269
270#ifdef SERIAL_DEBUG_INTR
271 printk("DR%02x:%02x...", ch, status);
272#endif
273 flag = TTY_NORMAL;
274
275 /*
276 * We don't handle parity or frame errors - but I have left
277 * the code in, since I'm not sure that the errors can't be
278 * detected.
279 */
280
281 if (status & (UART_LSR_BI | UART_LSR_PE |
282 UART_LSR_FE | UART_LSR_OE)) {
283 /*
284 * For statistics only
285 */
286 if (status & UART_LSR_BI) {
287 status &= ~(UART_LSR_FE | UART_LSR_PE);
288 icount->brk++;
289 } else if (status & UART_LSR_PE)
290 icount->parity++;
291 else if (status & UART_LSR_FE)
292 icount->frame++;
293 if (status & UART_LSR_OE)
294 icount->overrun++;
295
296 /*
297 * Now check to see if character should be
298 * ignored, and mask off conditions which
299 * should be ignored.
300 */
301 if (status & info->ignore_status_mask)
302 goto out;
303
304 status &= info->read_status_mask;
305
306 if (status & (UART_LSR_BI)) {
307#ifdef SERIAL_DEBUG_INTR
308 printk("handling break....");
309#endif
310 flag = TTY_BREAK;
311 if (info->flags & ASYNC_SAK)
312 do_SAK(tty);
313 } else if (status & UART_LSR_PE)
314 flag = TTY_PARITY;
315 else if (status & UART_LSR_FE)
316 flag = TTY_FRAME;
317 if (status & UART_LSR_OE) {
318 /*
319 * Overrun is special, since it's
320 * reported immediately, and doesn't
321 * affect the current character
322 */
323 oe = 1;
324 }
325 }
326 tty_insert_flip_char(tty, ch, flag);
327 if (oe == 1)
328 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
329 tty_flip_buffer_push(tty);
330out:
331 return;
332}
333
334static void transmit_chars(struct async_struct *info)
335{
336 custom.intreq = IF_TBE;
337 mb();
338 if (info->x_char) {
339 custom.serdat = info->x_char | 0x100;
340 mb();
341 info->state->icount.tx++;
342 info->x_char = 0;
343 return;
344 }
345 if (info->xmit.head == info->xmit.tail
346 || info->tty->stopped
347 || info->tty->hw_stopped) {
348 info->IER &= ~UART_IER_THRI;
349 custom.intena = IF_TBE;
350 mb();
351 return;
352 }
353
354 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
355 mb();
356 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
357 info->state->icount.tx++;
358
359 if (CIRC_CNT(info->xmit.head,
360 info->xmit.tail,
361 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
362 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
363
364#ifdef SERIAL_DEBUG_INTR
365 printk("THRE...");
366#endif
367 if (info->xmit.head == info->xmit.tail) {
368 custom.intena = IF_TBE;
369 mb();
370 info->IER &= ~UART_IER_THRI;
371 }
372}
373
374static void check_modem_status(struct async_struct *info)
375{
376 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
377 unsigned char dstatus;
378 struct async_icount *icount;
379
380 /* Determine bits that have changed */
381 dstatus = status ^ current_ctl_bits;
382 current_ctl_bits = status;
383
384 if (dstatus) {
385 icount = &info->state->icount;
386 /* update input line counters */
387 if (dstatus & SER_DSR)
388 icount->dsr++;
389 if (dstatus & SER_DCD) {
390 icount->dcd++;
391#ifdef CONFIG_HARD_PPS
392 if ((info->flags & ASYNC_HARDPPS_CD) &&
393 !(status & SER_DCD))
394 hardpps();
395#endif
396 }
397 if (dstatus & SER_CTS)
398 icount->cts++;
399 wake_up_interruptible(&info->delta_msr_wait);
400 }
401
402 if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
403#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
404 printk("ttyS%d CD now %s...", info->line,
405 (!(status & SER_DCD)) ? "on" : "off");
406#endif
407 if (!(status & SER_DCD))
408 wake_up_interruptible(&info->open_wait);
409 else {
410#ifdef SERIAL_DEBUG_OPEN
411 printk("doing serial hangup...");
412#endif
413 if (info->tty)
414 tty_hangup(info->tty);
415 }
416 }
417 if (info->flags & ASYNC_CTS_FLOW) {
418 if (info->tty->hw_stopped) {
419 if (!(status & SER_CTS)) {
420#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
421 printk("CTS tx start...");
422#endif
423 info->tty->hw_stopped = 0;
424 info->IER |= UART_IER_THRI;
425 custom.intena = IF_SETCLR | IF_TBE;
426 mb();
427 /* set a pending Tx Interrupt, transmitter should restart now */
428 custom.intreq = IF_SETCLR | IF_TBE;
429 mb();
430 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
431 return;
432 }
433 } else {
434 if ((status & SER_CTS)) {
435#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
436 printk("CTS tx stop...");
437#endif
438 info->tty->hw_stopped = 1;
439 info->IER &= ~UART_IER_THRI;
440 /* disable Tx interrupt and remove any pending interrupts */
441 custom.intena = IF_TBE;
442 mb();
443 custom.intreq = IF_TBE;
444 mb();
445 }
446 }
447 }
448}
449
450static irqreturn_t ser_vbl_int( int irq, void *data)
451{
452 /* vbl is just a periodic interrupt we tie into to update modem status */
453 struct async_struct * info = IRQ_ports;
454 /*
455 * TBD - is it better to unregister from this interrupt or to
456 * ignore it if MSI is clear ?
457 */
458 if(info->IER & UART_IER_MSI)
459 check_modem_status(info);
460 return IRQ_HANDLED;
461}
462
463static irqreturn_t ser_rx_int(int irq, void *dev_id)
464{
465 struct async_struct * info;
466
467#ifdef SERIAL_DEBUG_INTR
468 printk("ser_rx_int...");
469#endif
470
471 info = IRQ_ports;
472 if (!info || !info->tty)
473 return IRQ_NONE;
474
475 receive_chars(info);
476 info->last_active = jiffies;
477#ifdef SERIAL_DEBUG_INTR
478 printk("end.\n");
479#endif
480 return IRQ_HANDLED;
481}
482
483static irqreturn_t ser_tx_int(int irq, void *dev_id)
484{
485 struct async_struct * info;
486
487 if (custom.serdatr & SDR_TBE) {
488#ifdef SERIAL_DEBUG_INTR
489 printk("ser_tx_int...");
490#endif
491
492 info = IRQ_ports;
493 if (!info || !info->tty)
494 return IRQ_NONE;
495
496 transmit_chars(info);
497 info->last_active = jiffies;
498#ifdef SERIAL_DEBUG_INTR
499 printk("end.\n");
500#endif
501 }
502 return IRQ_HANDLED;
503}
504
505/*
506 * -------------------------------------------------------------------
507 * Here ends the serial interrupt routines.
508 * -------------------------------------------------------------------
509 */
510
511/*
512 * This routine is used to handle the "bottom half" processing for the
513 * serial driver, known also the "software interrupt" processing.
514 * This processing is done at the kernel interrupt level, after the
515 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
516 * is where time-consuming activities which can not be done in the
517 * interrupt driver proper are done; the interrupt driver schedules
518 * them using rs_sched_event(), and they get done here.
519 */
520
521static void do_softint(unsigned long private_)
522{
523 struct async_struct *info = (struct async_struct *) private_;
524 struct tty_struct *tty;
525
526 tty = info->tty;
527 if (!tty)
528 return;
529
530 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
531 tty_wakeup(tty);
532}
533
534/*
535 * ---------------------------------------------------------------
536 * Low level utility subroutines for the serial driver: routines to
537 * figure out the appropriate timeout for an interrupt chain, routines
538 * to initialize and startup a serial port, and routines to shutdown a
539 * serial port. Useful stuff like that.
540 * ---------------------------------------------------------------
541 */
542
543static int startup(struct async_struct * info)
544{
545 unsigned long flags;
546 int retval=0;
547 unsigned long page;
548
549 page = get_zeroed_page(GFP_KERNEL);
550 if (!page)
551 return -ENOMEM;
552
553 local_irq_save(flags);
554
555 if (info->flags & ASYNC_INITIALIZED) {
556 free_page(page);
557 goto errout;
558 }
559
560 if (info->xmit.buf)
561 free_page(page);
562 else
563 info->xmit.buf = (unsigned char *) page;
564
565#ifdef SERIAL_DEBUG_OPEN
566 printk("starting up ttys%d ...", info->line);
567#endif
568
569 /* Clear anything in the input buffer */
570
571 custom.intreq = IF_RBF;
572 mb();
573
574 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
575 if (retval) {
576 if (serial_isroot()) {
577 if (info->tty)
578 set_bit(TTY_IO_ERROR,
579 &info->tty->flags);
580 retval = 0;
581 }
582 goto errout;
583 }
584
585 /* enable both Rx and Tx interrupts */
586 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
587 mb();
588 info->IER = UART_IER_MSI;
589
590 /* remember current state of the DCD and CTS bits */
591 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
592
593 IRQ_ports = info;
594
595 info->MCR = 0;
596 if (info->tty->termios->c_cflag & CBAUD)
597 info->MCR = SER_DTR | SER_RTS;
598 rtsdtr_ctrl(info->MCR);
599
600 if (info->tty)
601 clear_bit(TTY_IO_ERROR, &info->tty->flags);
602 info->xmit.head = info->xmit.tail = 0;
603
604 /*
605 * Set up the tty->alt_speed kludge
606 */
607 if (info->tty) {
608 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
609 info->tty->alt_speed = 57600;
610 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
611 info->tty->alt_speed = 115200;
612 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
613 info->tty->alt_speed = 230400;
614 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
615 info->tty->alt_speed = 460800;
616 }
617
618 /*
619 * and set the speed of the serial port
620 */
621 change_speed(info, NULL);
622
623 info->flags |= ASYNC_INITIALIZED;
624 local_irq_restore(flags);
625 return 0;
626
627errout:
628 local_irq_restore(flags);
629 return retval;
630}
631
632/*
633 * This routine will shutdown a serial port; interrupts are disabled, and
634 * DTR is dropped if the hangup on close termio flag is on.
635 */
636static void shutdown(struct async_struct * info)
637{
638 unsigned long flags;
639 struct serial_state *state;
640
641 if (!(info->flags & ASYNC_INITIALIZED))
642 return;
643
644 state = info->state;
645
646#ifdef SERIAL_DEBUG_OPEN
647 printk("Shutting down serial port %d ....\n", info->line);
648#endif
649
650 local_irq_save(flags); /* Disable interrupts */
651
652 /*
653 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
654 * here so the queue might never be waken up
655 */
656 wake_up_interruptible(&info->delta_msr_wait);
657
658 IRQ_ports = NULL;
659
660 /*
661 * Free the IRQ, if necessary
662 */
663 free_irq(IRQ_AMIGA_VERTB, info);
664
665 if (info->xmit.buf) {
666 free_page((unsigned long) info->xmit.buf);
667 info->xmit.buf = NULL;
668 }
669
670 info->IER = 0;
671 custom.intena = IF_RBF | IF_TBE;
672 mb();
673
674 /* disable break condition */
675 custom.adkcon = AC_UARTBRK;
676 mb();
677
678 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
679 info->MCR &= ~(SER_DTR|SER_RTS);
680 rtsdtr_ctrl(info->MCR);
681
682 if (info->tty)
683 set_bit(TTY_IO_ERROR, &info->tty->flags);
684
685 info->flags &= ~ASYNC_INITIALIZED;
686 local_irq_restore(flags);
687}
688
689
690/*
691 * This routine is called to set the UART divisor registers to match
692 * the specified baud rate for a serial port.
693 */
694static void change_speed(struct async_struct *info,
695 struct ktermios *old_termios)
696{
697 int quot = 0, baud_base, baud;
698 unsigned cflag, cval = 0;
699 int bits;
700 unsigned long flags;
701
702 if (!info->tty || !info->tty->termios)
703 return;
704 cflag = info->tty->termios->c_cflag;
705
706 /* Byte size is always 8 bits plus parity bit if requested */
707
708 cval = 3; bits = 10;
709 if (cflag & CSTOPB) {
710 cval |= 0x04;
711 bits++;
712 }
713 if (cflag & PARENB) {
714 cval |= UART_LCR_PARITY;
715 bits++;
716 }
717 if (!(cflag & PARODD))
718 cval |= UART_LCR_EPAR;
719#ifdef CMSPAR
720 if (cflag & CMSPAR)
721 cval |= UART_LCR_SPAR;
722#endif
723
724 /* Determine divisor based on baud rate */
725 baud = tty_get_baud_rate(info->tty);
726 if (!baud)
727 baud = 9600; /* B0 transition handled in rs_set_termios */
728 baud_base = info->state->baud_base;
729 if (baud == 38400 &&
730 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
731 quot = info->state->custom_divisor;
732 else {
733 if (baud == 134)
734 /* Special case since 134 is really 134.5 */
735 quot = (2*baud_base / 269);
736 else if (baud)
737 quot = baud_base / baud;
738 }
739 /* If the quotient is zero refuse the change */
740 if (!quot && old_termios) {
741 /* FIXME: Will need updating for new tty in the end */
742 info->tty->termios->c_cflag &= ~CBAUD;
743 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
744 baud = tty_get_baud_rate(info->tty);
745 if (!baud)
746 baud = 9600;
747 if (baud == 38400 &&
748 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
749 quot = info->state->custom_divisor;
750 else {
751 if (baud == 134)
752 /* Special case since 134 is really 134.5 */
753 quot = (2*baud_base / 269);
754 else if (baud)
755 quot = baud_base / baud;
756 }
757 }
758 /* As a last resort, if the quotient is zero, default to 9600 bps */
759 if (!quot)
760 quot = baud_base / 9600;
761 info->quot = quot;
762 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
763 info->timeout += HZ/50; /* Add .02 seconds of slop */
764
765 /* CTS flow control flag and modem status interrupts */
766 info->IER &= ~UART_IER_MSI;
767 if (info->flags & ASYNC_HARDPPS_CD)
768 info->IER |= UART_IER_MSI;
769 if (cflag & CRTSCTS) {
770 info->flags |= ASYNC_CTS_FLOW;
771 info->IER |= UART_IER_MSI;
772 } else
773 info->flags &= ~ASYNC_CTS_FLOW;
774 if (cflag & CLOCAL)
775 info->flags &= ~ASYNC_CHECK_CD;
776 else {
777 info->flags |= ASYNC_CHECK_CD;
778 info->IER |= UART_IER_MSI;
779 }
780 /* TBD:
781 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
782 */
783
784 /*
785 * Set up parity check flag
786 */
787
788 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
789 if (I_INPCK(info->tty))
790 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
791 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
792 info->read_status_mask |= UART_LSR_BI;
793
794 /*
795 * Characters to ignore
796 */
797 info->ignore_status_mask = 0;
798 if (I_IGNPAR(info->tty))
799 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
800 if (I_IGNBRK(info->tty)) {
801 info->ignore_status_mask |= UART_LSR_BI;
802 /*
803 * If we're ignore parity and break indicators, ignore
804 * overruns too. (For real raw support).
805 */
806 if (I_IGNPAR(info->tty))
807 info->ignore_status_mask |= UART_LSR_OE;
808 }
809 /*
810 * !!! ignore all characters if CREAD is not set
811 */
812 if ((cflag & CREAD) == 0)
813 info->ignore_status_mask |= UART_LSR_DR;
814 local_irq_save(flags);
815
816 {
817 short serper;
818
819 /* Set up the baud rate */
820 serper = quot - 1;
821
822 /* Enable or disable parity bit */
823
824 if(cval & UART_LCR_PARITY)
825 serper |= (SERPER_PARENB);
826
827 custom.serper = serper;
828 mb();
829 }
830
831 info->LCR = cval; /* Save LCR */
832 local_irq_restore(flags);
833}
834
835static int rs_put_char(struct tty_struct *tty, unsigned char ch)
836{
837 struct async_struct *info;
838 unsigned long flags;
839
840 info = tty->driver_data;
841
842 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
843 return 0;
844
845 if (!info->xmit.buf)
846 return 0;
847
848 local_irq_save(flags);
849 if (CIRC_SPACE(info->xmit.head,
850 info->xmit.tail,
851 SERIAL_XMIT_SIZE) == 0) {
852 local_irq_restore(flags);
853 return 0;
854 }
855
856 info->xmit.buf[info->xmit.head++] = ch;
857 info->xmit.head &= SERIAL_XMIT_SIZE-1;
858 local_irq_restore(flags);
859 return 1;
860}
861
862static void rs_flush_chars(struct tty_struct *tty)
863{
864 struct async_struct *info = tty->driver_data;
865 unsigned long flags;
866
867 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
868 return;
869
870 if (info->xmit.head == info->xmit.tail
871 || tty->stopped
872 || tty->hw_stopped
873 || !info->xmit.buf)
874 return;
875
876 local_irq_save(flags);
877 info->IER |= UART_IER_THRI;
878 custom.intena = IF_SETCLR | IF_TBE;
879 mb();
880 /* set a pending Tx Interrupt, transmitter should restart now */
881 custom.intreq = IF_SETCLR | IF_TBE;
882 mb();
883 local_irq_restore(flags);
884}
885
886static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
887{
888 int c, ret = 0;
889 struct async_struct *info;
890 unsigned long flags;
891
892 info = tty->driver_data;
893
894 if (serial_paranoia_check(info, tty->name, "rs_write"))
895 return 0;
896
897 if (!info->xmit.buf)
898 return 0;
899
900 local_irq_save(flags);
901 while (1) {
902 c = CIRC_SPACE_TO_END(info->xmit.head,
903 info->xmit.tail,
904 SERIAL_XMIT_SIZE);
905 if (count < c)
906 c = count;
907 if (c <= 0) {
908 break;
909 }
910 memcpy(info->xmit.buf + info->xmit.head, buf, c);
911 info->xmit.head = ((info->xmit.head + c) &
912 (SERIAL_XMIT_SIZE-1));
913 buf += c;
914 count -= c;
915 ret += c;
916 }
917 local_irq_restore(flags);
918
919 if (info->xmit.head != info->xmit.tail
920 && !tty->stopped
921 && !tty->hw_stopped
922 && !(info->IER & UART_IER_THRI)) {
923 info->IER |= UART_IER_THRI;
924 local_irq_disable();
925 custom.intena = IF_SETCLR | IF_TBE;
926 mb();
927 /* set a pending Tx Interrupt, transmitter should restart now */
928 custom.intreq = IF_SETCLR | IF_TBE;
929 mb();
930 local_irq_restore(flags);
931 }
932 return ret;
933}
934
935static int rs_write_room(struct tty_struct *tty)
936{
937 struct async_struct *info = tty->driver_data;
938
939 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
940 return 0;
941 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
942}
943
944static int rs_chars_in_buffer(struct tty_struct *tty)
945{
946 struct async_struct *info = tty->driver_data;
947
948 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
949 return 0;
950 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
951}
952
953static void rs_flush_buffer(struct tty_struct *tty)
954{
955 struct async_struct *info = tty->driver_data;
956 unsigned long flags;
957
958 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
959 return;
960 local_irq_save(flags);
961 info->xmit.head = info->xmit.tail = 0;
962 local_irq_restore(flags);
963 tty_wakeup(tty);
964}
965
966/*
967 * This function is used to send a high-priority XON/XOFF character to
968 * the device
969 */
970static void rs_send_xchar(struct tty_struct *tty, char ch)
971{
972 struct async_struct *info = tty->driver_data;
973 unsigned long flags;
974
975 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
976 return;
977
978 info->x_char = ch;
979 if (ch) {
980 /* Make sure transmit interrupts are on */
981
982 /* Check this ! */
983 local_irq_save(flags);
984 if(!(custom.intenar & IF_TBE)) {
985 custom.intena = IF_SETCLR | IF_TBE;
986 mb();
987 /* set a pending Tx Interrupt, transmitter should restart now */
988 custom.intreq = IF_SETCLR | IF_TBE;
989 mb();
990 }
991 local_irq_restore(flags);
992
993 info->IER |= UART_IER_THRI;
994 }
995}
996
997/*
998 * ------------------------------------------------------------
999 * rs_throttle()
1000 *
1001 * This routine is called by the upper-layer tty layer to signal that
1002 * incoming characters should be throttled.
1003 * ------------------------------------------------------------
1004 */
1005static void rs_throttle(struct tty_struct * tty)
1006{
1007 struct async_struct *info = tty->driver_data;
1008 unsigned long flags;
1009#ifdef SERIAL_DEBUG_THROTTLE
1010 char buf[64];
1011
1012 printk("throttle %s: %d....\n", tty_name(tty, buf),
1013 tty->ldisc.chars_in_buffer(tty));
1014#endif
1015
1016 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1017 return;
1018
1019 if (I_IXOFF(tty))
1020 rs_send_xchar(tty, STOP_CHAR(tty));
1021
1022 if (tty->termios->c_cflag & CRTSCTS)
1023 info->MCR &= ~SER_RTS;
1024
1025 local_irq_save(flags);
1026 rtsdtr_ctrl(info->MCR);
1027 local_irq_restore(flags);
1028}
1029
1030static void rs_unthrottle(struct tty_struct * tty)
1031{
1032 struct async_struct *info = tty->driver_data;
1033 unsigned long flags;
1034#ifdef SERIAL_DEBUG_THROTTLE
1035 char buf[64];
1036
1037 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1038 tty->ldisc.chars_in_buffer(tty));
1039#endif
1040
1041 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1042 return;
1043
1044 if (I_IXOFF(tty)) {
1045 if (info->x_char)
1046 info->x_char = 0;
1047 else
1048 rs_send_xchar(tty, START_CHAR(tty));
1049 }
1050 if (tty->termios->c_cflag & CRTSCTS)
1051 info->MCR |= SER_RTS;
1052 local_irq_save(flags);
1053 rtsdtr_ctrl(info->MCR);
1054 local_irq_restore(flags);
1055}
1056
1057/*
1058 * ------------------------------------------------------------
1059 * rs_ioctl() and friends
1060 * ------------------------------------------------------------
1061 */
1062
1063static int get_serial_info(struct async_struct * info,
1064 struct serial_struct __user * retinfo)
1065{
1066 struct serial_struct tmp;
1067 struct serial_state *state = info->state;
1068
1069 if (!retinfo)
1070 return -EFAULT;
1071 memset(&tmp, 0, sizeof(tmp));
1072 tty_lock();
1073 tmp.type = state->type;
1074 tmp.line = state->line;
1075 tmp.port = state->port;
1076 tmp.irq = state->irq;
1077 tmp.flags = state->flags;
1078 tmp.xmit_fifo_size = state->xmit_fifo_size;
1079 tmp.baud_base = state->baud_base;
1080 tmp.close_delay = state->close_delay;
1081 tmp.closing_wait = state->closing_wait;
1082 tmp.custom_divisor = state->custom_divisor;
1083 tty_unlock();
1084 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1085 return -EFAULT;
1086 return 0;
1087}
1088
1089static int set_serial_info(struct async_struct * info,
1090 struct serial_struct __user * new_info)
1091{
1092 struct serial_struct new_serial;
1093 struct serial_state old_state, *state;
1094 unsigned int change_irq,change_port;
1095 int retval = 0;
1096
1097 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1098 return -EFAULT;
1099
1100 tty_lock();
1101 state = info->state;
1102 old_state = *state;
1103
1104 change_irq = new_serial.irq != state->irq;
1105 change_port = (new_serial.port != state->port);
1106 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1107 tty_unlock();
1108 return -EINVAL;
1109 }
1110
1111 if (!serial_isroot()) {
1112 if ((new_serial.baud_base != state->baud_base) ||
1113 (new_serial.close_delay != state->close_delay) ||
1114 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1115 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1116 (state->flags & ~ASYNC_USR_MASK)))
1117 return -EPERM;
1118 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1119 (new_serial.flags & ASYNC_USR_MASK));
1120 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1121 (new_serial.flags & ASYNC_USR_MASK));
1122 state->custom_divisor = new_serial.custom_divisor;
1123 goto check_and_exit;
1124 }
1125
1126 if (new_serial.baud_base < 9600) {
1127 tty_unlock();
1128 return -EINVAL;
1129 }
1130
1131 /*
1132 * OK, past this point, all the error checking has been done.
1133 * At this point, we start making changes.....
1134 */
1135
1136 state->baud_base = new_serial.baud_base;
1137 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1138 (new_serial.flags & ASYNC_FLAGS));
1139 info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1140 (info->flags & ASYNC_INTERNAL_FLAGS));
1141 state->custom_divisor = new_serial.custom_divisor;
1142 state->close_delay = new_serial.close_delay * HZ/100;
1143 state->closing_wait = new_serial.closing_wait * HZ/100;
1144 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1145
1146check_and_exit:
1147 if (info->flags & ASYNC_INITIALIZED) {
1148 if (((old_state.flags & ASYNC_SPD_MASK) !=
1149 (state->flags & ASYNC_SPD_MASK)) ||
1150 (old_state.custom_divisor != state->custom_divisor)) {
1151 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1152 info->tty->alt_speed = 57600;
1153 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1154 info->tty->alt_speed = 115200;
1155 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1156 info->tty->alt_speed = 230400;
1157 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1158 info->tty->alt_speed = 460800;
1159 change_speed(info, NULL);
1160 }
1161 } else
1162 retval = startup(info);
1163 tty_unlock();
1164 return retval;
1165}
1166
1167
1168/*
1169 * get_lsr_info - get line status register info
1170 *
1171 * Purpose: Let user call ioctl() to get info when the UART physically
1172 * is emptied. On bus types like RS485, the transmitter must
1173 * release the bus after transmitting. This must be done when
1174 * the transmit shift register is empty, not be done when the
1175 * transmit holding register is empty. This functionality
1176 * allows an RS485 driver to be written in user space.
1177 */
1178static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1179{
1180 unsigned char status;
1181 unsigned int result;
1182 unsigned long flags;
1183
1184 local_irq_save(flags);
1185 status = custom.serdatr;
1186 mb();
1187 local_irq_restore(flags);
1188 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1189 if (copy_to_user(value, &result, sizeof(int)))
1190 return -EFAULT;
1191 return 0;
1192}
1193
1194
1195static int rs_tiocmget(struct tty_struct *tty)
1196{
1197 struct async_struct * info = tty->driver_data;
1198 unsigned char control, status;
1199 unsigned long flags;
1200
1201 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1202 return -ENODEV;
1203 if (tty->flags & (1 << TTY_IO_ERROR))
1204 return -EIO;
1205
1206 control = info->MCR;
1207 local_irq_save(flags);
1208 status = ciab.pra;
1209 local_irq_restore(flags);
1210 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1211 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1212 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1213 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1214 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1215}
1216
1217static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1218 unsigned int clear)
1219{
1220 struct async_struct * info = tty->driver_data;
1221 unsigned long flags;
1222
1223 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1224 return -ENODEV;
1225 if (tty->flags & (1 << TTY_IO_ERROR))
1226 return -EIO;
1227
1228 local_irq_save(flags);
1229 if (set & TIOCM_RTS)
1230 info->MCR |= SER_RTS;
1231 if (set & TIOCM_DTR)
1232 info->MCR |= SER_DTR;
1233 if (clear & TIOCM_RTS)
1234 info->MCR &= ~SER_RTS;
1235 if (clear & TIOCM_DTR)
1236 info->MCR &= ~SER_DTR;
1237 rtsdtr_ctrl(info->MCR);
1238 local_irq_restore(flags);
1239 return 0;
1240}
1241
1242/*
1243 * rs_break() --- routine which turns the break handling on or off
1244 */
1245static int rs_break(struct tty_struct *tty, int break_state)
1246{
1247 struct async_struct * info = tty->driver_data;
1248 unsigned long flags;
1249
1250 if (serial_paranoia_check(info, tty->name, "rs_break"))
1251 return -EINVAL;
1252
1253 local_irq_save(flags);
1254 if (break_state == -1)
1255 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1256 else
1257 custom.adkcon = AC_UARTBRK;
1258 mb();
1259 local_irq_restore(flags);
1260 return 0;
1261}
1262
1263/*
1264 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1265 * Return: write counters to the user passed counter struct
1266 * NB: both 1->0 and 0->1 transitions are counted except for
1267 * RI where only 0->1 is counted.
1268 */
1269static int rs_get_icount(struct tty_struct *tty,
1270 struct serial_icounter_struct *icount)
1271{
1272 struct async_struct *info = tty->driver_data;
1273 struct async_icount cnow;
1274 unsigned long flags;
1275
1276 local_irq_save(flags);
1277 cnow = info->state->icount;
1278 local_irq_restore(flags);
1279 icount->cts = cnow.cts;
1280 icount->dsr = cnow.dsr;
1281 icount->rng = cnow.rng;
1282 icount->dcd = cnow.dcd;
1283 icount->rx = cnow.rx;
1284 icount->tx = cnow.tx;
1285 icount->frame = cnow.frame;
1286 icount->overrun = cnow.overrun;
1287 icount->parity = cnow.parity;
1288 icount->brk = cnow.brk;
1289 icount->buf_overrun = cnow.buf_overrun;
1290
1291 return 0;
1292}
1293
1294static int rs_ioctl(struct tty_struct *tty,
1295 unsigned int cmd, unsigned long arg)
1296{
1297 struct async_struct * info = tty->driver_data;
1298 struct async_icount cprev, cnow; /* kernel counter temps */
1299 void __user *argp = (void __user *)arg;
1300 unsigned long flags;
1301
1302 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1303 return -ENODEV;
1304
1305 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1306 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1307 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1308 if (tty->flags & (1 << TTY_IO_ERROR))
1309 return -EIO;
1310 }
1311
1312 switch (cmd) {
1313 case TIOCGSERIAL:
1314 return get_serial_info(info, argp);
1315 case TIOCSSERIAL:
1316 return set_serial_info(info, argp);
1317 case TIOCSERCONFIG:
1318 return 0;
1319
1320 case TIOCSERGETLSR: /* Get line status register */
1321 return get_lsr_info(info, argp);
1322
1323 case TIOCSERGSTRUCT:
1324 if (copy_to_user(argp,
1325 info, sizeof(struct async_struct)))
1326 return -EFAULT;
1327 return 0;
1328
1329 /*
1330 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1331 * - mask passed in arg for lines of interest
1332 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1333 * Caller should use TIOCGICOUNT to see which one it was
1334 */
1335 case TIOCMIWAIT:
1336 local_irq_save(flags);
1337 /* note the counters on entry */
1338 cprev = info->state->icount;
1339 local_irq_restore(flags);
1340 while (1) {
1341 interruptible_sleep_on(&info->delta_msr_wait);
1342 /* see if a signal did it */
1343 if (signal_pending(current))
1344 return -ERESTARTSYS;
1345 local_irq_save(flags);
1346 cnow = info->state->icount; /* atomic copy */
1347 local_irq_restore(flags);
1348 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1349 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1350 return -EIO; /* no change => error */
1351 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1352 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1353 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1354 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1355 return 0;
1356 }
1357 cprev = cnow;
1358 }
1359 /* NOTREACHED */
1360
1361 case TIOCSERGWILD:
1362 case TIOCSERSWILD:
1363 /* "setserial -W" is called in Debian boot */
1364 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1365 return 0;
1366
1367 default:
1368 return -ENOIOCTLCMD;
1369 }
1370 return 0;
1371}
1372
1373static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1374{
1375 struct async_struct *info = tty->driver_data;
1376 unsigned long flags;
1377 unsigned int cflag = tty->termios->c_cflag;
1378
1379 change_speed(info, old_termios);
1380
1381 /* Handle transition to B0 status */
1382 if ((old_termios->c_cflag & CBAUD) &&
1383 !(cflag & CBAUD)) {
1384 info->MCR &= ~(SER_DTR|SER_RTS);
1385 local_irq_save(flags);
1386 rtsdtr_ctrl(info->MCR);
1387 local_irq_restore(flags);
1388 }
1389
1390 /* Handle transition away from B0 status */
1391 if (!(old_termios->c_cflag & CBAUD) &&
1392 (cflag & CBAUD)) {
1393 info->MCR |= SER_DTR;
1394 if (!(tty->termios->c_cflag & CRTSCTS) ||
1395 !test_bit(TTY_THROTTLED, &tty->flags)) {
1396 info->MCR |= SER_RTS;
1397 }
1398 local_irq_save(flags);
1399 rtsdtr_ctrl(info->MCR);
1400 local_irq_restore(flags);
1401 }
1402
1403 /* Handle turning off CRTSCTS */
1404 if ((old_termios->c_cflag & CRTSCTS) &&
1405 !(tty->termios->c_cflag & CRTSCTS)) {
1406 tty->hw_stopped = 0;
1407 rs_start(tty);
1408 }
1409
1410#if 0
1411 /*
1412 * No need to wake up processes in open wait, since they
1413 * sample the CLOCAL flag once, and don't recheck it.
1414 * XXX It's not clear whether the current behavior is correct
1415 * or not. Hence, this may change.....
1416 */
1417 if (!(old_termios->c_cflag & CLOCAL) &&
1418 (tty->termios->c_cflag & CLOCAL))
1419 wake_up_interruptible(&info->open_wait);
1420#endif
1421}
1422
1423/*
1424 * ------------------------------------------------------------
1425 * rs_close()
1426 *
1427 * This routine is called when the serial port gets closed. First, we
1428 * wait for the last remaining data to be sent. Then, we unlink its
1429 * async structure from the interrupt chain if necessary, and we free
1430 * that IRQ if nothing is left in the chain.
1431 * ------------------------------------------------------------
1432 */
1433static void rs_close(struct tty_struct *tty, struct file * filp)
1434{
1435 struct async_struct * info = tty->driver_data;
1436 struct serial_state *state;
1437 unsigned long flags;
1438
1439 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1440 return;
1441
1442 state = info->state;
1443
1444 local_irq_save(flags);
1445
1446 if (tty_hung_up_p(filp)) {
1447 DBG_CNT("before DEC-hung");
1448 local_irq_restore(flags);
1449 return;
1450 }
1451
1452#ifdef SERIAL_DEBUG_OPEN
1453 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1454#endif
1455 if ((tty->count == 1) && (state->count != 1)) {
1456 /*
1457 * Uh, oh. tty->count is 1, which means that the tty
1458 * structure will be freed. state->count should always
1459 * be one in these conditions. If it's greater than
1460 * one, we've got real problems, since it means the
1461 * serial port won't be shutdown.
1462 */
1463 printk("rs_close: bad serial port count; tty->count is 1, "
1464 "state->count is %d\n", state->count);
1465 state->count = 1;
1466 }
1467 if (--state->count < 0) {
1468 printk("rs_close: bad serial port count for ttys%d: %d\n",
1469 info->line, state->count);
1470 state->count = 0;
1471 }
1472 if (state->count) {
1473 DBG_CNT("before DEC-2");
1474 local_irq_restore(flags);
1475 return;
1476 }
1477 info->flags |= ASYNC_CLOSING;
1478 /*
1479 * Now we wait for the transmit buffer to clear; and we notify
1480 * the line discipline to only process XON/XOFF characters.
1481 */
1482 tty->closing = 1;
1483 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1484 tty_wait_until_sent(tty, info->closing_wait);
1485 /*
1486 * At this point we stop accepting input. To do this, we
1487 * disable the receive line status interrupts, and tell the
1488 * interrupt driver to stop checking the data ready bit in the
1489 * line status register.
1490 */
1491 info->read_status_mask &= ~UART_LSR_DR;
1492 if (info->flags & ASYNC_INITIALIZED) {
1493 /* disable receive interrupts */
1494 custom.intena = IF_RBF;
1495 mb();
1496 /* clear any pending receive interrupt */
1497 custom.intreq = IF_RBF;
1498 mb();
1499
1500 /*
1501 * Before we drop DTR, make sure the UART transmitter
1502 * has completely drained; this is especially
1503 * important if there is a transmit FIFO!
1504 */
1505 rs_wait_until_sent(tty, info->timeout);
1506 }
1507 shutdown(info);
1508 rs_flush_buffer(tty);
1509
1510 tty_ldisc_flush(tty);
1511 tty->closing = 0;
1512 info->event = 0;
1513 info->tty = NULL;
1514 if (info->blocked_open) {
1515 if (info->close_delay) {
1516 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1517 }
1518 wake_up_interruptible(&info->open_wait);
1519 }
1520 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1521 wake_up_interruptible(&info->close_wait);
1522 local_irq_restore(flags);
1523}
1524
1525/*
1526 * rs_wait_until_sent() --- wait until the transmitter is empty
1527 */
1528static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1529{
1530 struct async_struct * info = tty->driver_data;
1531 unsigned long orig_jiffies, char_time;
1532 int tty_was_locked = tty_locked();
1533 int lsr;
1534
1535 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1536 return;
1537
1538 if (info->xmit_fifo_size == 0)
1539 return; /* Just in case.... */
1540
1541 orig_jiffies = jiffies;
1542
1543 /*
1544 * tty_wait_until_sent is called from lots of places,
1545 * with or without the BTM.
1546 */
1547 if (!tty_was_locked)
1548 tty_lock();
1549 /*
1550 * Set the check interval to be 1/5 of the estimated time to
1551 * send a single character, and make it at least 1. The check
1552 * interval should also be less than the timeout.
1553 *
1554 * Note: we have to use pretty tight timings here to satisfy
1555 * the NIST-PCTS.
1556 */
1557 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1558 char_time = char_time / 5;
1559 if (char_time == 0)
1560 char_time = 1;
1561 if (timeout)
1562 char_time = min_t(unsigned long, char_time, timeout);
1563 /*
1564 * If the transmitter hasn't cleared in twice the approximate
1565 * amount of time to send the entire FIFO, it probably won't
1566 * ever clear. This assumes the UART isn't doing flow
1567 * control, which is currently the case. Hence, if it ever
1568 * takes longer than info->timeout, this is probably due to a
1569 * UART bug of some kind. So, we clamp the timeout parameter at
1570 * 2*info->timeout.
1571 */
1572 if (!timeout || timeout > 2*info->timeout)
1573 timeout = 2*info->timeout;
1574#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1575 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1576 printk("jiff=%lu...", jiffies);
1577#endif
1578 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1579#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1580 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1581#endif
1582 msleep_interruptible(jiffies_to_msecs(char_time));
1583 if (signal_pending(current))
1584 break;
1585 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1586 break;
1587 }
1588 __set_current_state(TASK_RUNNING);
1589 if (!tty_was_locked)
1590 tty_unlock();
1591#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1592 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1593#endif
1594}
1595
1596/*
1597 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1598 */
1599static void rs_hangup(struct tty_struct *tty)
1600{
1601 struct async_struct * info = tty->driver_data;
1602 struct serial_state *state = info->state;
1603
1604 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1605 return;
1606
1607 state = info->state;
1608
1609 rs_flush_buffer(tty);
1610 shutdown(info);
1611 info->event = 0;
1612 state->count = 0;
1613 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1614 info->tty = NULL;
1615 wake_up_interruptible(&info->open_wait);
1616}
1617
1618/*
1619 * ------------------------------------------------------------
1620 * rs_open() and friends
1621 * ------------------------------------------------------------
1622 */
1623static int block_til_ready(struct tty_struct *tty, struct file * filp,
1624 struct async_struct *info)
1625{
1626#ifdef DECLARE_WAITQUEUE
1627 DECLARE_WAITQUEUE(wait, current);
1628#else
1629 struct wait_queue wait = { current, NULL };
1630#endif
1631 struct serial_state *state = info->state;
1632 int retval;
1633 int do_clocal = 0, extra_count = 0;
1634 unsigned long flags;
1635
1636 /*
1637 * If the device is in the middle of being closed, then block
1638 * until it's done, and then try again.
1639 */
1640 if (tty_hung_up_p(filp) ||
1641 (info->flags & ASYNC_CLOSING)) {
1642 if (info->flags & ASYNC_CLOSING)
1643 interruptible_sleep_on(&info->close_wait);
1644#ifdef SERIAL_DO_RESTART
1645 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1646 -EAGAIN : -ERESTARTSYS);
1647#else
1648 return -EAGAIN;
1649#endif
1650 }
1651
1652 /*
1653 * If non-blocking mode is set, or the port is not enabled,
1654 * then make the check up front and then exit.
1655 */
1656 if ((filp->f_flags & O_NONBLOCK) ||
1657 (tty->flags & (1 << TTY_IO_ERROR))) {
1658 info->flags |= ASYNC_NORMAL_ACTIVE;
1659 return 0;
1660 }
1661
1662 if (tty->termios->c_cflag & CLOCAL)
1663 do_clocal = 1;
1664
1665 /*
1666 * Block waiting for the carrier detect and the line to become
1667 * free (i.e., not in use by the callout). While we are in
1668 * this loop, state->count is dropped by one, so that
1669 * rs_close() knows when to free things. We restore it upon
1670 * exit, either normal or abnormal.
1671 */
1672 retval = 0;
1673 add_wait_queue(&info->open_wait, &wait);
1674#ifdef SERIAL_DEBUG_OPEN
1675 printk("block_til_ready before block: ttys%d, count = %d\n",
1676 state->line, state->count);
1677#endif
1678 local_irq_save(flags);
1679 if (!tty_hung_up_p(filp)) {
1680 extra_count = 1;
1681 state->count--;
1682 }
1683 local_irq_restore(flags);
1684 info->blocked_open++;
1685 while (1) {
1686 local_irq_save(flags);
1687 if (tty->termios->c_cflag & CBAUD)
1688 rtsdtr_ctrl(SER_DTR|SER_RTS);
1689 local_irq_restore(flags);
1690 set_current_state(TASK_INTERRUPTIBLE);
1691 if (tty_hung_up_p(filp) ||
1692 !(info->flags & ASYNC_INITIALIZED)) {
1693#ifdef SERIAL_DO_RESTART
1694 if (info->flags & ASYNC_HUP_NOTIFY)
1695 retval = -EAGAIN;
1696 else
1697 retval = -ERESTARTSYS;
1698#else
1699 retval = -EAGAIN;
1700#endif
1701 break;
1702 }
1703 if (!(info->flags & ASYNC_CLOSING) &&
1704 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1705 break;
1706 if (signal_pending(current)) {
1707 retval = -ERESTARTSYS;
1708 break;
1709 }
1710#ifdef SERIAL_DEBUG_OPEN
1711 printk("block_til_ready blocking: ttys%d, count = %d\n",
1712 info->line, state->count);
1713#endif
1714 tty_unlock();
1715 schedule();
1716 tty_lock();
1717 }
1718 __set_current_state(TASK_RUNNING);
1719 remove_wait_queue(&info->open_wait, &wait);
1720 if (extra_count)
1721 state->count++;
1722 info->blocked_open--;
1723#ifdef SERIAL_DEBUG_OPEN
1724 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1725 info->line, state->count);
1726#endif
1727 if (retval)
1728 return retval;
1729 info->flags |= ASYNC_NORMAL_ACTIVE;
1730 return 0;
1731}
1732
1733static int get_async_struct(int line, struct async_struct **ret_info)
1734{
1735 struct async_struct *info;
1736 struct serial_state *sstate;
1737
1738 sstate = rs_table + line;
1739 sstate->count++;
1740 if (sstate->info) {
1741 *ret_info = sstate->info;
1742 return 0;
1743 }
1744 info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1745 if (!info) {
1746 sstate->count--;
1747 return -ENOMEM;
1748 }
1749#ifdef DECLARE_WAITQUEUE
1750 init_waitqueue_head(&info->open_wait);
1751 init_waitqueue_head(&info->close_wait);
1752 init_waitqueue_head(&info->delta_msr_wait);
1753#endif
1754 info->magic = SERIAL_MAGIC;
1755 info->port = sstate->port;
1756 info->flags = sstate->flags;
1757 info->xmit_fifo_size = sstate->xmit_fifo_size;
1758 info->line = line;
1759 tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1760 info->state = sstate;
1761 if (sstate->info) {
1762 kfree(info);
1763 *ret_info = sstate->info;
1764 return 0;
1765 }
1766 *ret_info = sstate->info = info;
1767 return 0;
1768}
1769
1770/*
1771 * This routine is called whenever a serial port is opened. It
1772 * enables interrupts for a serial port, linking in its async structure into
1773 * the IRQ chain. It also performs the serial-specific
1774 * initialization for the tty structure.
1775 */
1776static int rs_open(struct tty_struct *tty, struct file * filp)
1777{
1778 struct async_struct *info;
1779 int retval, line;
1780
1781 line = tty->index;
1782 if ((line < 0) || (line >= NR_PORTS)) {
1783 return -ENODEV;
1784 }
1785 retval = get_async_struct(line, &info);
1786 if (retval) {
1787 return retval;
1788 }
1789 tty->driver_data = info;
1790 info->tty = tty;
1791 if (serial_paranoia_check(info, tty->name, "rs_open"))
1792 return -ENODEV;
1793
1794#ifdef SERIAL_DEBUG_OPEN
1795 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1796#endif
1797 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1798
1799 /*
1800 * If the port is the middle of closing, bail out now
1801 */
1802 if (tty_hung_up_p(filp) ||
1803 (info->flags & ASYNC_CLOSING)) {
1804 if (info->flags & ASYNC_CLOSING)
1805 interruptible_sleep_on(&info->close_wait);
1806#ifdef SERIAL_DO_RESTART
1807 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1808 -EAGAIN : -ERESTARTSYS);
1809#else
1810 return -EAGAIN;
1811#endif
1812 }
1813
1814 /*
1815 * Start up serial port
1816 */
1817 retval = startup(info);
1818 if (retval) {
1819 return retval;
1820 }
1821
1822 retval = block_til_ready(tty, filp, info);
1823 if (retval) {
1824#ifdef SERIAL_DEBUG_OPEN
1825 printk("rs_open returning after block_til_ready with %d\n",
1826 retval);
1827#endif
1828 return retval;
1829 }
1830
1831#ifdef SERIAL_DEBUG_OPEN
1832 printk("rs_open %s successful...", tty->name);
1833#endif
1834 return 0;
1835}
1836
1837/*
1838 * /proc fs routines....
1839 */
1840
1841static inline void line_info(struct seq_file *m, struct serial_state *state)
1842{
1843 struct async_struct *info = state->info, scr_info;
1844 char stat_buf[30], control, status;
1845 unsigned long flags;
1846
1847 seq_printf(m, "%d: uart:amiga_builtin",state->line);
1848
1849 /*
1850 * Figure out the current RS-232 lines
1851 */
1852 if (!info) {
1853 info = &scr_info; /* This is just for serial_{in,out} */
1854
1855 info->magic = SERIAL_MAGIC;
1856 info->flags = state->flags;
1857 info->quot = 0;
1858 info->tty = NULL;
1859 }
1860 local_irq_save(flags);
1861 status = ciab.pra;
1862 control = info ? info->MCR : status;
1863 local_irq_restore(flags);
1864
1865 stat_buf[0] = 0;
1866 stat_buf[1] = 0;
1867 if(!(control & SER_RTS))
1868 strcat(stat_buf, "|RTS");
1869 if(!(status & SER_CTS))
1870 strcat(stat_buf, "|CTS");
1871 if(!(control & SER_DTR))
1872 strcat(stat_buf, "|DTR");
1873 if(!(status & SER_DSR))
1874 strcat(stat_buf, "|DSR");
1875 if(!(status & SER_DCD))
1876 strcat(stat_buf, "|CD");
1877
1878 if (info->quot) {
1879 seq_printf(m, " baud:%d", state->baud_base / info->quot);
1880 }
1881
1882 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1883
1884 if (state->icount.frame)
1885 seq_printf(m, " fe:%d", state->icount.frame);
1886
1887 if (state->icount.parity)
1888 seq_printf(m, " pe:%d", state->icount.parity);
1889
1890 if (state->icount.brk)
1891 seq_printf(m, " brk:%d", state->icount.brk);
1892
1893 if (state->icount.overrun)
1894 seq_printf(m, " oe:%d", state->icount.overrun);
1895
1896 /*
1897 * Last thing is the RS-232 status lines
1898 */
1899 seq_printf(m, " %s\n", stat_buf+1);
1900}
1901
1902static int rs_proc_show(struct seq_file *m, void *v)
1903{
1904 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1905 line_info(m, &rs_table[0]);
1906 return 0;
1907}
1908
1909static int rs_proc_open(struct inode *inode, struct file *file)
1910{
1911 return single_open(file, rs_proc_show, NULL);
1912}
1913
1914static const struct file_operations rs_proc_fops = {
1915 .owner = THIS_MODULE,
1916 .open = rs_proc_open,
1917 .read = seq_read,
1918 .llseek = seq_lseek,
1919 .release = single_release,
1920};
1921
1922/*
1923 * ---------------------------------------------------------------------
1924 * rs_init() and friends
1925 *
1926 * rs_init() is called at boot-time to initialize the serial driver.
1927 * ---------------------------------------------------------------------
1928 */
1929
1930/*
1931 * This routine prints out the appropriate serial driver version
1932 * number, and identifies which options were configured into this
1933 * driver.
1934 */
1935static void show_serial_version(void)
1936{
1937 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1938}
1939
1940
1941static const struct tty_operations serial_ops = {
1942 .open = rs_open,
1943 .close = rs_close,
1944 .write = rs_write,
1945 .put_char = rs_put_char,
1946 .flush_chars = rs_flush_chars,
1947 .write_room = rs_write_room,
1948 .chars_in_buffer = rs_chars_in_buffer,
1949 .flush_buffer = rs_flush_buffer,
1950 .ioctl = rs_ioctl,
1951 .throttle = rs_throttle,
1952 .unthrottle = rs_unthrottle,
1953 .set_termios = rs_set_termios,
1954 .stop = rs_stop,
1955 .start = rs_start,
1956 .hangup = rs_hangup,
1957 .break_ctl = rs_break,
1958 .send_xchar = rs_send_xchar,
1959 .wait_until_sent = rs_wait_until_sent,
1960 .tiocmget = rs_tiocmget,
1961 .tiocmset = rs_tiocmset,
1962 .get_icount = rs_get_icount,
1963 .proc_fops = &rs_proc_fops,
1964};
1965
1966/*
1967 * The serial driver boot-time initialization code!
1968 */
1969static int __init amiga_serial_probe(struct platform_device *pdev)
1970{
1971 unsigned long flags;
1972 struct serial_state * state;
1973 int error;
1974
1975 serial_driver = alloc_tty_driver(1);
1976 if (!serial_driver)
1977 return -ENOMEM;
1978
1979 IRQ_ports = NULL;
1980
1981 show_serial_version();
1982
1983 /* Initialize the tty_driver structure */
1984
1985 serial_driver->owner = THIS_MODULE;
1986 serial_driver->driver_name = "amiserial";
1987 serial_driver->name = "ttyS";
1988 serial_driver->major = TTY_MAJOR;
1989 serial_driver->minor_start = 64;
1990 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1991 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1992 serial_driver->init_termios = tty_std_termios;
1993 serial_driver->init_termios.c_cflag =
1994 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1995 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1996 tty_set_operations(serial_driver, &serial_ops);
1997
1998 error = tty_register_driver(serial_driver);
1999 if (error)
2000 goto fail_put_tty_driver;
2001
2002 state = rs_table;
2003 state->magic = SSTATE_MAGIC;
2004 state->port = (int)&custom.serdatr; /* Just to give it a value */
2005 state->line = 0;
2006 state->custom_divisor = 0;
2007 state->close_delay = 5*HZ/10;
2008 state->closing_wait = 30*HZ;
2009 state->icount.cts = state->icount.dsr =
2010 state->icount.rng = state->icount.dcd = 0;
2011 state->icount.rx = state->icount.tx = 0;
2012 state->icount.frame = state->icount.parity = 0;
2013 state->icount.overrun = state->icount.brk = 0;
2014
2015 printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2016 state->line);
2017
2018 /* Hardware set up */
2019
2020 state->baud_base = amiga_colorclock;
2021 state->xmit_fifo_size = 1;
2022
2023 /* set ISRs, and then disable the rx interrupts */
2024 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2025 if (error)
2026 goto fail_unregister;
2027
2028 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED,
2029 "serial RX", state);
2030 if (error)
2031 goto fail_free_irq;
2032
2033 local_irq_save(flags);
2034
2035 /* turn off Rx and Tx interrupts */
2036 custom.intena = IF_RBF | IF_TBE;
2037 mb();
2038
2039 /* clear any pending interrupt */
2040 custom.intreq = IF_RBF | IF_TBE;
2041 mb();
2042
2043 local_irq_restore(flags);
2044
2045 /*
2046 * set the appropriate directions for the modem control flags,
2047 * and clear RTS and DTR
2048 */
2049 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2050 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2051
2052 platform_set_drvdata(pdev, state);
2053
2054 return 0;
2055
2056fail_free_irq:
2057 free_irq(IRQ_AMIGA_TBE, state);
2058fail_unregister:
2059 tty_unregister_driver(serial_driver);
2060fail_put_tty_driver:
2061 put_tty_driver(serial_driver);
2062 return error;
2063}
2064
2065static int __exit amiga_serial_remove(struct platform_device *pdev)
2066{
2067 int error;
2068 struct serial_state *state = platform_get_drvdata(pdev);
2069 struct async_struct *info = state->info;
2070
2071 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2072 tasklet_kill(&info->tlet);
2073 if ((error = tty_unregister_driver(serial_driver)))
2074 printk("SERIAL: failed to unregister serial driver (%d)\n",
2075 error);
2076 put_tty_driver(serial_driver);
2077
2078 rs_table[0].info = NULL;
2079 kfree(info);
2080
2081 free_irq(IRQ_AMIGA_TBE, rs_table);
2082 free_irq(IRQ_AMIGA_RBF, rs_table);
2083
2084 platform_set_drvdata(pdev, NULL);
2085
2086 return error;
2087}
2088
2089static struct platform_driver amiga_serial_driver = {
2090 .remove = __exit_p(amiga_serial_remove),
2091 .driver = {
2092 .name = "amiga-serial",
2093 .owner = THIS_MODULE,
2094 },
2095};
2096
2097static int __init amiga_serial_init(void)
2098{
2099 return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
2100}
2101
2102module_init(amiga_serial_init);
2103
2104static void __exit amiga_serial_exit(void)
2105{
2106 platform_driver_unregister(&amiga_serial_driver);
2107}
2108
2109module_exit(amiga_serial_exit);
2110
2111
2112#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2113
2114/*
2115 * ------------------------------------------------------------
2116 * Serial console driver
2117 * ------------------------------------------------------------
2118 */
2119
2120static void amiga_serial_putc(char c)
2121{
2122 custom.serdat = (unsigned char)c | 0x100;
2123 while (!(custom.serdatr & 0x2000))
2124 barrier();
2125}
2126
2127/*
2128 * Print a string to the serial port trying not to disturb
2129 * any possible real use of the port...
2130 *
2131 * The console must be locked when we get here.
2132 */
2133static void serial_console_write(struct console *co, const char *s,
2134 unsigned count)
2135{
2136 unsigned short intena = custom.intenar;
2137
2138 custom.intena = IF_TBE;
2139
2140 while (count--) {
2141 if (*s == '\n')
2142 amiga_serial_putc('\r');
2143 amiga_serial_putc(*s++);
2144 }
2145
2146 custom.intena = IF_SETCLR | (intena & IF_TBE);
2147}
2148
2149static struct tty_driver *serial_console_device(struct console *c, int *index)
2150{
2151 *index = 0;
2152 return serial_driver;
2153}
2154
2155static struct console sercons = {
2156 .name = "ttyS",
2157 .write = serial_console_write,
2158 .device = serial_console_device,
2159 .flags = CON_PRINTBUFFER,
2160 .index = -1,
2161};
2162
2163/*
2164 * Register console.
2165 */
2166static int __init amiserial_console_init(void)
2167{
2168 register_console(&sercons);
2169 return 0;
2170}
2171console_initcall(amiserial_console_init);
2172
2173#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
2174
2175MODULE_LICENSE("GPL");
2176MODULE_ALIAS("platform:amiga-serial");