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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Serial driver for the amiga builtin port.
4 *
5 * This code was created by taking serial.c version 4.30 from kernel
6 * release 2.3.22, replacing all hardware related stuff with the
7 * corresponding amiga hardware actions, and removing all irrelevant
8 * code. As a consequence, it uses many of the constants and names
9 * associated with the registers and bits of 16550 compatible UARTS -
10 * but only to keep track of status, etc in the state variables. It
11 * was done this was to make it easier to keep the code in line with
12 * (non hardware specific) changes to serial.c.
13 *
14 * The port is registered with the tty driver as minor device 64, and
15 * therefore other ports should only use 65 upwards.
16 *
17 * Richard Lucock 28/12/99
18 *
19 * Copyright (C) 1991, 1992 Linus Torvalds
20 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
21 * 1998, 1999 Theodore Ts'o
22 *
23 */
24
25/* Set of debugging defines */
26
27#undef SERIAL_DEBUG_INTR
28#undef SERIAL_DEBUG_OPEN
29#undef SERIAL_DEBUG_FLOW
30#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
31
32/*
33 * End of serial driver configuration section.
34 */
35
36#include <linux/bitops.h>
37#include <linux/circ_buf.h>
38#include <linux/console.h>
39#include <linux/delay.h>
40#include <linux/errno.h>
41#include <linux/fcntl.h>
42#include <linux/init.h>
43#include <linux/interrupt.h>
44#include <linux/ioport.h>
45#include <linux/kernel.h>
46#include <linux/major.h>
47#include <linux/mm.h>
48#include <linux/module.h>
49#include <linux/platform_device.h>
50#include <linux/ptrace.h>
51#include <linux/seq_file.h>
52#include <linux/serial.h>
53#include <linux/serial_reg.h>
54#include <linux/serial_core.h>
55#include <linux/sched.h>
56#include <linux/signal.h>
57#include <linux/slab.h>
58#include <linux/string.h>
59#include <linux/timer.h>
60#include <linux/tty_flip.h>
61#include <linux/tty.h>
62#include <linux/types.h>
63#include <linux/uaccess.h>
64
65#include <asm/amigahw.h>
66#include <asm/amigaints.h>
67#include <asm/irq.h>
68#include <asm/setup.h>
69
70struct serial_state {
71 struct tty_port tport;
72 struct circ_buf xmit;
73 struct async_icount icount;
74
75 unsigned long port;
76 int baud_base;
77 int custom_divisor;
78 int read_status_mask;
79 int ignore_status_mask;
80 int timeout;
81 int quot;
82 int IER; /* Interrupt Enable Register */
83 int MCR; /* Modem control register */
84 int x_char; /* xon/xoff character */
85};
86
87static struct tty_driver *serial_driver;
88
89/* number of characters left in xmit buffer before we ask for more */
90#define WAKEUP_CHARS 256
91
92#define XMIT_FIFO_SIZE 1
93
94static unsigned char current_ctl_bits;
95
96static void change_speed(struct tty_struct *tty, struct serial_state *info,
97 const struct ktermios *old);
98static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
99
100
101static struct serial_state serial_state;
102
103/* some serial hardware definitions */
104#define SDR_OVRUN (1<<15)
105#define SDR_RBF (1<<14)
106#define SDR_TBE (1<<13)
107#define SDR_TSRE (1<<12)
108
109#define SERPER_PARENB (1<<15)
110
111#define AC_SETCLR (1<<15)
112#define AC_UARTBRK (1<<11)
113
114#define SER_DTR (1<<7)
115#define SER_RTS (1<<6)
116#define SER_DCD (1<<5)
117#define SER_CTS (1<<4)
118#define SER_DSR (1<<3)
119
120static __inline__ void rtsdtr_ctrl(int bits)
121{
122 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
123}
124
125/*
126 * ------------------------------------------------------------
127 * rs_stop() and rs_start()
128 *
129 * This routines are called before setting or resetting tty->flow.stopped.
130 * They enable or disable transmitter interrupts, as necessary.
131 * ------------------------------------------------------------
132 */
133static void rs_stop(struct tty_struct *tty)
134{
135 struct serial_state *info = tty->driver_data;
136 unsigned long flags;
137
138 local_irq_save(flags);
139 if (info->IER & UART_IER_THRI) {
140 info->IER &= ~UART_IER_THRI;
141 /* disable Tx interrupt and remove any pending interrupts */
142 amiga_custom.intena = IF_TBE;
143 mb();
144 amiga_custom.intreq = IF_TBE;
145 mb();
146 }
147 local_irq_restore(flags);
148}
149
150static void rs_start(struct tty_struct *tty)
151{
152 struct serial_state *info = tty->driver_data;
153 unsigned long flags;
154
155 local_irq_save(flags);
156 if (info->xmit.head != info->xmit.tail
157 && info->xmit.buf
158 && !(info->IER & UART_IER_THRI)) {
159 info->IER |= UART_IER_THRI;
160 amiga_custom.intena = IF_SETCLR | IF_TBE;
161 mb();
162 /* set a pending Tx Interrupt, transmitter should restart now */
163 amiga_custom.intreq = IF_SETCLR | IF_TBE;
164 mb();
165 }
166 local_irq_restore(flags);
167}
168
169/*
170 * ----------------------------------------------------------------------
171 *
172 * Here start the interrupt handling routines.
173 *
174 * -----------------------------------------------------------------------
175 */
176
177static void receive_chars(struct serial_state *info)
178{
179 int status;
180 int serdatr;
181 unsigned char ch, flag;
182 struct async_icount *icount;
183 int oe = 0;
184
185 icount = &info->icount;
186
187 status = UART_LSR_DR; /* We obviously have a character! */
188 serdatr = amiga_custom.serdatr;
189 mb();
190 amiga_custom.intreq = IF_RBF;
191 mb();
192
193 if((serdatr & 0x1ff) == 0)
194 status |= UART_LSR_BI;
195 if(serdatr & SDR_OVRUN)
196 status |= UART_LSR_OE;
197
198 ch = serdatr & 0xff;
199 icount->rx++;
200
201#ifdef SERIAL_DEBUG_INTR
202 printk("DR%02x:%02x...", ch, status);
203#endif
204 flag = TTY_NORMAL;
205
206 /*
207 * We don't handle parity or frame errors - but I have left
208 * the code in, since I'm not sure that the errors can't be
209 * detected.
210 */
211
212 if (status & (UART_LSR_BI | UART_LSR_PE |
213 UART_LSR_FE | UART_LSR_OE)) {
214 /*
215 * For statistics only
216 */
217 if (status & UART_LSR_BI) {
218 status &= ~(UART_LSR_FE | UART_LSR_PE);
219 icount->brk++;
220 } else if (status & UART_LSR_PE)
221 icount->parity++;
222 else if (status & UART_LSR_FE)
223 icount->frame++;
224 if (status & UART_LSR_OE)
225 icount->overrun++;
226
227 /*
228 * Now check to see if character should be
229 * ignored, and mask off conditions which
230 * should be ignored.
231 */
232 if (status & info->ignore_status_mask)
233 goto out;
234
235 status &= info->read_status_mask;
236
237 if (status & (UART_LSR_BI)) {
238#ifdef SERIAL_DEBUG_INTR
239 printk("handling break....");
240#endif
241 flag = TTY_BREAK;
242 if (info->tport.flags & ASYNC_SAK)
243 do_SAK(info->tport.tty);
244 } else if (status & UART_LSR_PE)
245 flag = TTY_PARITY;
246 else if (status & UART_LSR_FE)
247 flag = TTY_FRAME;
248 if (status & UART_LSR_OE) {
249 /*
250 * Overrun is special, since it's
251 * reported immediately, and doesn't
252 * affect the current character
253 */
254 oe = 1;
255 }
256 }
257 tty_insert_flip_char(&info->tport, ch, flag);
258 if (oe == 1)
259 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
260 tty_flip_buffer_push(&info->tport);
261out:
262 return;
263}
264
265static void transmit_chars(struct serial_state *info)
266{
267 amiga_custom.intreq = IF_TBE;
268 mb();
269 if (info->x_char) {
270 amiga_custom.serdat = info->x_char | 0x100;
271 mb();
272 info->icount.tx++;
273 info->x_char = 0;
274 return;
275 }
276 if (info->xmit.head == info->xmit.tail
277 || info->tport.tty->flow.stopped
278 || info->tport.tty->hw_stopped) {
279 info->IER &= ~UART_IER_THRI;
280 amiga_custom.intena = IF_TBE;
281 mb();
282 return;
283 }
284
285 amiga_custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
286 mb();
287 info->xmit.tail = info->xmit.tail & (UART_XMIT_SIZE - 1);
288 info->icount.tx++;
289
290 if (CIRC_CNT(info->xmit.head,
291 info->xmit.tail,
292 UART_XMIT_SIZE) < WAKEUP_CHARS)
293 tty_wakeup(info->tport.tty);
294
295#ifdef SERIAL_DEBUG_INTR
296 printk("THRE...");
297#endif
298 if (info->xmit.head == info->xmit.tail) {
299 amiga_custom.intena = IF_TBE;
300 mb();
301 info->IER &= ~UART_IER_THRI;
302 }
303}
304
305static void check_modem_status(struct serial_state *info)
306{
307 struct tty_port *port = &info->tport;
308 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
309 unsigned char dstatus;
310 struct async_icount *icount;
311
312 /* Determine bits that have changed */
313 dstatus = status ^ current_ctl_bits;
314 current_ctl_bits = status;
315
316 if (dstatus) {
317 icount = &info->icount;
318 /* update input line counters */
319 if (dstatus & SER_DSR)
320 icount->dsr++;
321 if (dstatus & SER_DCD) {
322 icount->dcd++;
323 }
324 if (dstatus & SER_CTS)
325 icount->cts++;
326 wake_up_interruptible(&port->delta_msr_wait);
327 }
328
329 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
330#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
331 printk("ttyS%d CD now %s...", info->line,
332 (!(status & SER_DCD)) ? "on" : "off");
333#endif
334 if (!(status & SER_DCD))
335 wake_up_interruptible(&port->open_wait);
336 else {
337#ifdef SERIAL_DEBUG_OPEN
338 printk("doing serial hangup...");
339#endif
340 if (port->tty)
341 tty_hangup(port->tty);
342 }
343 }
344 if (tty_port_cts_enabled(port)) {
345 if (port->tty->hw_stopped) {
346 if (!(status & SER_CTS)) {
347#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
348 printk("CTS tx start...");
349#endif
350 port->tty->hw_stopped = 0;
351 info->IER |= UART_IER_THRI;
352 amiga_custom.intena = IF_SETCLR | IF_TBE;
353 mb();
354 /* set a pending Tx Interrupt, transmitter should restart now */
355 amiga_custom.intreq = IF_SETCLR | IF_TBE;
356 mb();
357 tty_wakeup(port->tty);
358 return;
359 }
360 } else {
361 if ((status & SER_CTS)) {
362#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
363 printk("CTS tx stop...");
364#endif
365 port->tty->hw_stopped = 1;
366 info->IER &= ~UART_IER_THRI;
367 /* disable Tx interrupt and remove any pending interrupts */
368 amiga_custom.intena = IF_TBE;
369 mb();
370 amiga_custom.intreq = IF_TBE;
371 mb();
372 }
373 }
374 }
375}
376
377static irqreturn_t ser_vbl_int( int irq, void *data)
378{
379 /* vbl is just a periodic interrupt we tie into to update modem status */
380 struct serial_state *info = data;
381 /*
382 * TBD - is it better to unregister from this interrupt or to
383 * ignore it if MSI is clear ?
384 */
385 if(info->IER & UART_IER_MSI)
386 check_modem_status(info);
387 return IRQ_HANDLED;
388}
389
390static irqreturn_t ser_rx_int(int irq, void *dev_id)
391{
392 struct serial_state *info = dev_id;
393
394#ifdef SERIAL_DEBUG_INTR
395 printk("ser_rx_int...");
396#endif
397
398 if (!info->tport.tty)
399 return IRQ_NONE;
400
401 receive_chars(info);
402#ifdef SERIAL_DEBUG_INTR
403 printk("end.\n");
404#endif
405 return IRQ_HANDLED;
406}
407
408static irqreturn_t ser_tx_int(int irq, void *dev_id)
409{
410 struct serial_state *info = dev_id;
411
412 if (amiga_custom.serdatr & SDR_TBE) {
413#ifdef SERIAL_DEBUG_INTR
414 printk("ser_tx_int...");
415#endif
416
417 if (!info->tport.tty)
418 return IRQ_NONE;
419
420 transmit_chars(info);
421#ifdef SERIAL_DEBUG_INTR
422 printk("end.\n");
423#endif
424 }
425 return IRQ_HANDLED;
426}
427
428/*
429 * -------------------------------------------------------------------
430 * Here ends the serial interrupt routines.
431 * -------------------------------------------------------------------
432 */
433
434/*
435 * ---------------------------------------------------------------
436 * Low level utility subroutines for the serial driver: routines to
437 * figure out the appropriate timeout for an interrupt chain, routines
438 * to initialize and startup a serial port, and routines to shutdown a
439 * serial port. Useful stuff like that.
440 * ---------------------------------------------------------------
441 */
442
443static int startup(struct tty_struct *tty, struct serial_state *info)
444{
445 struct tty_port *port = &info->tport;
446 unsigned long flags;
447 int retval=0;
448 unsigned long page;
449
450 page = get_zeroed_page(GFP_KERNEL);
451 if (!page)
452 return -ENOMEM;
453
454 local_irq_save(flags);
455
456 if (tty_port_initialized(port)) {
457 free_page(page);
458 goto errout;
459 }
460
461 if (info->xmit.buf)
462 free_page(page);
463 else
464 info->xmit.buf = (unsigned char *) page;
465
466#ifdef SERIAL_DEBUG_OPEN
467 printk("starting up ttys%d ...", info->line);
468#endif
469
470 /* Clear anything in the input buffer */
471
472 amiga_custom.intreq = IF_RBF;
473 mb();
474
475 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
476 if (retval) {
477 if (capable(CAP_SYS_ADMIN)) {
478 set_bit(TTY_IO_ERROR, &tty->flags);
479 retval = 0;
480 }
481 goto errout;
482 }
483
484 /* enable both Rx and Tx interrupts */
485 amiga_custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
486 mb();
487 info->IER = UART_IER_MSI;
488
489 /* remember current state of the DCD and CTS bits */
490 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
491
492 info->MCR = 0;
493 if (C_BAUD(tty))
494 info->MCR = SER_DTR | SER_RTS;
495 rtsdtr_ctrl(info->MCR);
496
497 clear_bit(TTY_IO_ERROR, &tty->flags);
498 info->xmit.head = info->xmit.tail = 0;
499
500 /*
501 * and set the speed of the serial port
502 */
503 change_speed(tty, info, NULL);
504
505 tty_port_set_initialized(port, 1);
506 local_irq_restore(flags);
507 return 0;
508
509errout:
510 local_irq_restore(flags);
511 return retval;
512}
513
514/*
515 * This routine will shutdown a serial port; interrupts are disabled, and
516 * DTR is dropped if the hangup on close termio flag is on.
517 */
518static void shutdown(struct tty_struct *tty, struct serial_state *info)
519{
520 unsigned long flags;
521
522 if (!tty_port_initialized(&info->tport))
523 return;
524
525#ifdef SERIAL_DEBUG_OPEN
526 printk("Shutting down serial port %d ....\n", info->line);
527#endif
528
529 local_irq_save(flags); /* Disable interrupts */
530
531 /*
532 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
533 * here so the queue might never be waken up
534 */
535 wake_up_interruptible(&info->tport.delta_msr_wait);
536
537 /*
538 * Free the IRQ, if necessary
539 */
540 free_irq(IRQ_AMIGA_VERTB, info);
541
542 free_page((unsigned long)info->xmit.buf);
543 info->xmit.buf = NULL;
544
545 info->IER = 0;
546 amiga_custom.intena = IF_RBF | IF_TBE;
547 mb();
548
549 /* disable break condition */
550 amiga_custom.adkcon = AC_UARTBRK;
551 mb();
552
553 if (C_HUPCL(tty))
554 info->MCR &= ~(SER_DTR|SER_RTS);
555 rtsdtr_ctrl(info->MCR);
556
557 set_bit(TTY_IO_ERROR, &tty->flags);
558
559 tty_port_set_initialized(&info->tport, 0);
560 local_irq_restore(flags);
561}
562
563
564/*
565 * This routine is called to set the UART divisor registers to match
566 * the specified baud rate for a serial port.
567 */
568static void change_speed(struct tty_struct *tty, struct serial_state *info,
569 const struct ktermios *old_termios)
570{
571 struct tty_port *port = &info->tport;
572 int quot = 0, baud_base, baud;
573 unsigned cflag, cval = 0;
574 int bits;
575 unsigned long flags;
576
577 cflag = tty->termios.c_cflag;
578
579 /* Byte size is always 8 bits plus parity bit if requested */
580
581 cval = 3; bits = 10;
582 if (cflag & CSTOPB) {
583 cval |= 0x04;
584 bits++;
585 }
586 if (cflag & PARENB) {
587 cval |= UART_LCR_PARITY;
588 bits++;
589 }
590 if (!(cflag & PARODD))
591 cval |= UART_LCR_EPAR;
592 if (cflag & CMSPAR)
593 cval |= UART_LCR_SPAR;
594
595 /* Determine divisor based on baud rate */
596 baud = tty_get_baud_rate(tty);
597 if (!baud)
598 baud = 9600; /* B0 transition handled in rs_set_termios */
599 baud_base = info->baud_base;
600 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
601 quot = info->custom_divisor;
602 else {
603 if (baud == 134)
604 /* Special case since 134 is really 134.5 */
605 quot = (2*baud_base / 269);
606 else if (baud)
607 quot = baud_base / baud;
608 }
609 /* If the quotient is zero refuse the change */
610 if (!quot && old_termios) {
611 /* FIXME: Will need updating for new tty in the end */
612 tty->termios.c_cflag &= ~CBAUD;
613 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
614 baud = tty_get_baud_rate(tty);
615 if (!baud)
616 baud = 9600;
617 if (baud == 38400 &&
618 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
619 quot = info->custom_divisor;
620 else {
621 if (baud == 134)
622 /* Special case since 134 is really 134.5 */
623 quot = (2*baud_base / 269);
624 else if (baud)
625 quot = baud_base / baud;
626 }
627 }
628 /* As a last resort, if the quotient is zero, default to 9600 bps */
629 if (!quot)
630 quot = baud_base / 9600;
631 info->quot = quot;
632 info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base;
633 info->timeout += HZ/50; /* Add .02 seconds of slop */
634
635 /* CTS flow control flag and modem status interrupts */
636 info->IER &= ~UART_IER_MSI;
637 if (port->flags & ASYNC_HARDPPS_CD)
638 info->IER |= UART_IER_MSI;
639 tty_port_set_cts_flow(port, cflag & CRTSCTS);
640 if (cflag & CRTSCTS)
641 info->IER |= UART_IER_MSI;
642 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
643 if (~cflag & CLOCAL)
644 info->IER |= UART_IER_MSI;
645 /* TBD:
646 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
647 */
648
649 /*
650 * Set up parity check flag
651 */
652
653 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
654 if (I_INPCK(tty))
655 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
656 if (I_BRKINT(tty) || I_PARMRK(tty))
657 info->read_status_mask |= UART_LSR_BI;
658
659 /*
660 * Characters to ignore
661 */
662 info->ignore_status_mask = 0;
663 if (I_IGNPAR(tty))
664 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
665 if (I_IGNBRK(tty)) {
666 info->ignore_status_mask |= UART_LSR_BI;
667 /*
668 * If we're ignore parity and break indicators, ignore
669 * overruns too. (For real raw support).
670 */
671 if (I_IGNPAR(tty))
672 info->ignore_status_mask |= UART_LSR_OE;
673 }
674 /*
675 * !!! ignore all characters if CREAD is not set
676 */
677 if ((cflag & CREAD) == 0)
678 info->ignore_status_mask |= UART_LSR_DR;
679 local_irq_save(flags);
680
681 {
682 short serper;
683
684 /* Set up the baud rate */
685 serper = quot - 1;
686
687 /* Enable or disable parity bit */
688
689 if(cval & UART_LCR_PARITY)
690 serper |= (SERPER_PARENB);
691
692 amiga_custom.serper = serper;
693 mb();
694 }
695
696 local_irq_restore(flags);
697}
698
699static int rs_put_char(struct tty_struct *tty, unsigned char ch)
700{
701 struct serial_state *info;
702 unsigned long flags;
703
704 info = tty->driver_data;
705
706 if (!info->xmit.buf)
707 return 0;
708
709 local_irq_save(flags);
710 if (CIRC_SPACE(info->xmit.head,
711 info->xmit.tail,
712 UART_XMIT_SIZE) == 0) {
713 local_irq_restore(flags);
714 return 0;
715 }
716
717 info->xmit.buf[info->xmit.head++] = ch;
718 info->xmit.head &= UART_XMIT_SIZE - 1;
719 local_irq_restore(flags);
720 return 1;
721}
722
723static void rs_flush_chars(struct tty_struct *tty)
724{
725 struct serial_state *info = tty->driver_data;
726 unsigned long flags;
727
728 if (info->xmit.head == info->xmit.tail
729 || tty->flow.stopped
730 || tty->hw_stopped
731 || !info->xmit.buf)
732 return;
733
734 local_irq_save(flags);
735 info->IER |= UART_IER_THRI;
736 amiga_custom.intena = IF_SETCLR | IF_TBE;
737 mb();
738 /* set a pending Tx Interrupt, transmitter should restart now */
739 amiga_custom.intreq = IF_SETCLR | IF_TBE;
740 mb();
741 local_irq_restore(flags);
742}
743
744static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
745{
746 int c, ret = 0;
747 struct serial_state *info = tty->driver_data;
748 unsigned long flags;
749
750 if (!info->xmit.buf)
751 return 0;
752
753 local_irq_save(flags);
754 while (1) {
755 c = CIRC_SPACE_TO_END(info->xmit.head,
756 info->xmit.tail,
757 UART_XMIT_SIZE);
758 if (count < c)
759 c = count;
760 if (c <= 0) {
761 break;
762 }
763 memcpy(info->xmit.buf + info->xmit.head, buf, c);
764 info->xmit.head = (info->xmit.head + c) & (UART_XMIT_SIZE - 1);
765 buf += c;
766 count -= c;
767 ret += c;
768 }
769 local_irq_restore(flags);
770
771 if (info->xmit.head != info->xmit.tail
772 && !tty->flow.stopped
773 && !tty->hw_stopped
774 && !(info->IER & UART_IER_THRI)) {
775 info->IER |= UART_IER_THRI;
776 local_irq_disable();
777 amiga_custom.intena = IF_SETCLR | IF_TBE;
778 mb();
779 /* set a pending Tx Interrupt, transmitter should restart now */
780 amiga_custom.intreq = IF_SETCLR | IF_TBE;
781 mb();
782 local_irq_restore(flags);
783 }
784 return ret;
785}
786
787static unsigned int rs_write_room(struct tty_struct *tty)
788{
789 struct serial_state *info = tty->driver_data;
790
791 return CIRC_SPACE(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
792}
793
794static unsigned int rs_chars_in_buffer(struct tty_struct *tty)
795{
796 struct serial_state *info = tty->driver_data;
797
798 return CIRC_CNT(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
799}
800
801static void rs_flush_buffer(struct tty_struct *tty)
802{
803 struct serial_state *info = tty->driver_data;
804 unsigned long flags;
805
806 local_irq_save(flags);
807 info->xmit.head = info->xmit.tail = 0;
808 local_irq_restore(flags);
809 tty_wakeup(tty);
810}
811
812/*
813 * This function is used to send a high-priority XON/XOFF character to
814 * the device
815 */
816static void rs_send_xchar(struct tty_struct *tty, char ch)
817{
818 struct serial_state *info = tty->driver_data;
819 unsigned long flags;
820
821 info->x_char = ch;
822 if (ch) {
823 /* Make sure transmit interrupts are on */
824
825 /* Check this ! */
826 local_irq_save(flags);
827 if(!(amiga_custom.intenar & IF_TBE)) {
828 amiga_custom.intena = IF_SETCLR | IF_TBE;
829 mb();
830 /* set a pending Tx Interrupt, transmitter should restart now */
831 amiga_custom.intreq = IF_SETCLR | IF_TBE;
832 mb();
833 }
834 local_irq_restore(flags);
835
836 info->IER |= UART_IER_THRI;
837 }
838}
839
840/*
841 * ------------------------------------------------------------
842 * rs_throttle()
843 *
844 * This routine is called by the upper-layer tty layer to signal that
845 * incoming characters should be throttled.
846 * ------------------------------------------------------------
847 */
848static void rs_throttle(struct tty_struct * tty)
849{
850 struct serial_state *info = tty->driver_data;
851 unsigned long flags;
852#ifdef SERIAL_DEBUG_THROTTLE
853 printk("throttle %s ....\n", tty_name(tty));
854#endif
855
856 if (I_IXOFF(tty))
857 rs_send_xchar(tty, STOP_CHAR(tty));
858
859 if (C_CRTSCTS(tty))
860 info->MCR &= ~SER_RTS;
861
862 local_irq_save(flags);
863 rtsdtr_ctrl(info->MCR);
864 local_irq_restore(flags);
865}
866
867static void rs_unthrottle(struct tty_struct * tty)
868{
869 struct serial_state *info = tty->driver_data;
870 unsigned long flags;
871#ifdef SERIAL_DEBUG_THROTTLE
872 printk("unthrottle %s ....\n", tty_name(tty));
873#endif
874
875 if (I_IXOFF(tty)) {
876 if (info->x_char)
877 info->x_char = 0;
878 else
879 rs_send_xchar(tty, START_CHAR(tty));
880 }
881 if (C_CRTSCTS(tty))
882 info->MCR |= SER_RTS;
883 local_irq_save(flags);
884 rtsdtr_ctrl(info->MCR);
885 local_irq_restore(flags);
886}
887
888/*
889 * ------------------------------------------------------------
890 * rs_ioctl() and friends
891 * ------------------------------------------------------------
892 */
893
894static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
895{
896 struct serial_state *state = tty->driver_data;
897 unsigned int close_delay, closing_wait;
898
899 tty_lock(tty);
900 close_delay = jiffies_to_msecs(state->tport.close_delay) / 10;
901 closing_wait = state->tport.closing_wait;
902 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
903 closing_wait = jiffies_to_msecs(closing_wait) / 10;
904
905 ss->line = tty->index;
906 ss->port = state->port;
907 ss->flags = state->tport.flags;
908 ss->xmit_fifo_size = XMIT_FIFO_SIZE;
909 ss->baud_base = state->baud_base;
910 ss->close_delay = close_delay;
911 ss->closing_wait = closing_wait;
912 ss->custom_divisor = state->custom_divisor;
913 tty_unlock(tty);
914 return 0;
915}
916
917static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
918{
919 struct serial_state *state = tty->driver_data;
920 struct tty_port *port = &state->tport;
921 bool change_spd;
922 int retval = 0;
923 unsigned int close_delay, closing_wait;
924
925 tty_lock(tty);
926 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
927 ss->custom_divisor != state->custom_divisor;
928 if (ss->irq || ss->port != state->port ||
929 ss->xmit_fifo_size != XMIT_FIFO_SIZE) {
930 tty_unlock(tty);
931 return -EINVAL;
932 }
933
934 close_delay = msecs_to_jiffies(ss->close_delay * 10);
935 closing_wait = ss->closing_wait;
936 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
937 closing_wait = msecs_to_jiffies(closing_wait * 10);
938
939 if (!capable(CAP_SYS_ADMIN)) {
940 if ((ss->baud_base != state->baud_base) ||
941 (close_delay != port->close_delay) ||
942 (closing_wait != port->closing_wait) ||
943 ((ss->flags & ~ASYNC_USR_MASK) !=
944 (port->flags & ~ASYNC_USR_MASK))) {
945 tty_unlock(tty);
946 return -EPERM;
947 }
948 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
949 (ss->flags & ASYNC_USR_MASK));
950 state->custom_divisor = ss->custom_divisor;
951 goto check_and_exit;
952 }
953
954 if (ss->baud_base < 9600) {
955 tty_unlock(tty);
956 return -EINVAL;
957 }
958
959 /*
960 * OK, past this point, all the error checking has been done.
961 * At this point, we start making changes.....
962 */
963
964 state->baud_base = ss->baud_base;
965 port->flags = ((port->flags & ~ASYNC_FLAGS) |
966 (ss->flags & ASYNC_FLAGS));
967 state->custom_divisor = ss->custom_divisor;
968 port->close_delay = close_delay;
969 port->closing_wait = closing_wait;
970
971check_and_exit:
972 if (tty_port_initialized(port)) {
973 if (change_spd) {
974 /* warn about deprecation unless clearing */
975 if (ss->flags & ASYNC_SPD_MASK)
976 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
977 change_speed(tty, state, NULL);
978 }
979 } else
980 retval = startup(tty, state);
981 tty_unlock(tty);
982 return retval;
983}
984
985/*
986 * get_lsr_info - get line status register info
987 *
988 * Purpose: Let user call ioctl() to get info when the UART physically
989 * is emptied. On bus types like RS485, the transmitter must
990 * release the bus after transmitting. This must be done when
991 * the transmit shift register is empty, not be done when the
992 * transmit holding register is empty. This functionality
993 * allows an RS485 driver to be written in user space.
994 */
995static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
996{
997 unsigned char status;
998 unsigned int result;
999 unsigned long flags;
1000
1001 local_irq_save(flags);
1002 status = amiga_custom.serdatr;
1003 mb();
1004 local_irq_restore(flags);
1005 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1006 if (copy_to_user(value, &result, sizeof(int)))
1007 return -EFAULT;
1008 return 0;
1009}
1010
1011
1012static int rs_tiocmget(struct tty_struct *tty)
1013{
1014 struct serial_state *info = tty->driver_data;
1015 unsigned char control, status;
1016 unsigned long flags;
1017
1018 if (tty_io_error(tty))
1019 return -EIO;
1020
1021 control = info->MCR;
1022 local_irq_save(flags);
1023 status = ciab.pra;
1024 local_irq_restore(flags);
1025 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1026 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1027 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1028 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1029 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1030}
1031
1032static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1033 unsigned int clear)
1034{
1035 struct serial_state *info = tty->driver_data;
1036 unsigned long flags;
1037
1038 if (tty_io_error(tty))
1039 return -EIO;
1040
1041 local_irq_save(flags);
1042 if (set & TIOCM_RTS)
1043 info->MCR |= SER_RTS;
1044 if (set & TIOCM_DTR)
1045 info->MCR |= SER_DTR;
1046 if (clear & TIOCM_RTS)
1047 info->MCR &= ~SER_RTS;
1048 if (clear & TIOCM_DTR)
1049 info->MCR &= ~SER_DTR;
1050 rtsdtr_ctrl(info->MCR);
1051 local_irq_restore(flags);
1052 return 0;
1053}
1054
1055/*
1056 * rs_break() --- routine which turns the break handling on or off
1057 */
1058static int rs_break(struct tty_struct *tty, int break_state)
1059{
1060 unsigned long flags;
1061
1062 local_irq_save(flags);
1063 if (break_state == -1)
1064 amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK;
1065 else
1066 amiga_custom.adkcon = AC_UARTBRK;
1067 mb();
1068 local_irq_restore(flags);
1069 return 0;
1070}
1071
1072/*
1073 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1074 * Return: write counters to the user passed counter struct
1075 * NB: both 1->0 and 0->1 transitions are counted except for
1076 * RI where only 0->1 is counted.
1077 */
1078static int rs_get_icount(struct tty_struct *tty,
1079 struct serial_icounter_struct *icount)
1080{
1081 struct serial_state *info = tty->driver_data;
1082 struct async_icount cnow;
1083 unsigned long flags;
1084
1085 local_irq_save(flags);
1086 cnow = info->icount;
1087 local_irq_restore(flags);
1088 icount->cts = cnow.cts;
1089 icount->dsr = cnow.dsr;
1090 icount->rng = cnow.rng;
1091 icount->dcd = cnow.dcd;
1092 icount->rx = cnow.rx;
1093 icount->tx = cnow.tx;
1094 icount->frame = cnow.frame;
1095 icount->overrun = cnow.overrun;
1096 icount->parity = cnow.parity;
1097 icount->brk = cnow.brk;
1098 icount->buf_overrun = cnow.buf_overrun;
1099
1100 return 0;
1101}
1102
1103static int rs_ioctl(struct tty_struct *tty,
1104 unsigned int cmd, unsigned long arg)
1105{
1106 struct serial_state *info = tty->driver_data;
1107 struct async_icount cprev, cnow; /* kernel counter temps */
1108 void __user *argp = (void __user *)arg;
1109 unsigned long flags;
1110 DEFINE_WAIT(wait);
1111 int ret;
1112
1113 if ((cmd != TIOCSERCONFIG) &&
1114 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1115 if (tty_io_error(tty))
1116 return -EIO;
1117 }
1118
1119 switch (cmd) {
1120 case TIOCSERCONFIG:
1121 return 0;
1122
1123 case TIOCSERGETLSR: /* Get line status register */
1124 return get_lsr_info(info, argp);
1125
1126 /*
1127 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1128 * - mask passed in arg for lines of interest
1129 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1130 * Caller should use TIOCGICOUNT to see which one it was
1131 */
1132 case TIOCMIWAIT:
1133 local_irq_save(flags);
1134 /* note the counters on entry */
1135 cprev = info->icount;
1136 local_irq_restore(flags);
1137 while (1) {
1138 prepare_to_wait(&info->tport.delta_msr_wait,
1139 &wait, TASK_INTERRUPTIBLE);
1140 local_irq_save(flags);
1141 cnow = info->icount; /* atomic copy */
1142 local_irq_restore(flags);
1143 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1144 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1145 ret = -EIO; /* no change => error */
1146 break;
1147 }
1148 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1149 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1150 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1151 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1152 ret = 0;
1153 break;
1154 }
1155 schedule();
1156 /* see if a signal did it */
1157 if (signal_pending(current)) {
1158 ret = -ERESTARTSYS;
1159 break;
1160 }
1161 cprev = cnow;
1162 }
1163 finish_wait(&info->tport.delta_msr_wait, &wait);
1164 return ret;
1165
1166 default:
1167 return -ENOIOCTLCMD;
1168 }
1169 return 0;
1170}
1171
1172static void rs_set_termios(struct tty_struct *tty, const struct ktermios *old_termios)
1173{
1174 struct serial_state *info = tty->driver_data;
1175 unsigned long flags;
1176 unsigned int cflag = tty->termios.c_cflag;
1177
1178 change_speed(tty, info, old_termios);
1179
1180 /* Handle transition to B0 status */
1181 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1182 info->MCR &= ~(SER_DTR|SER_RTS);
1183 local_irq_save(flags);
1184 rtsdtr_ctrl(info->MCR);
1185 local_irq_restore(flags);
1186 }
1187
1188 /* Handle transition away from B0 status */
1189 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1190 info->MCR |= SER_DTR;
1191 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1192 info->MCR |= SER_RTS;
1193 local_irq_save(flags);
1194 rtsdtr_ctrl(info->MCR);
1195 local_irq_restore(flags);
1196 }
1197
1198 /* Handle turning off CRTSCTS */
1199 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1200 tty->hw_stopped = 0;
1201 rs_start(tty);
1202 }
1203
1204#if 0
1205 /*
1206 * No need to wake up processes in open wait, since they
1207 * sample the CLOCAL flag once, and don't recheck it.
1208 * XXX It's not clear whether the current behavior is correct
1209 * or not. Hence, this may change.....
1210 */
1211 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1212 wake_up_interruptible(&info->open_wait);
1213#endif
1214}
1215
1216/*
1217 * ------------------------------------------------------------
1218 * rs_close()
1219 *
1220 * This routine is called when the serial port gets closed. First, we
1221 * wait for the last remaining data to be sent. Then, we unlink its
1222 * async structure from the interrupt chain if necessary, and we free
1223 * that IRQ if nothing is left in the chain.
1224 * ------------------------------------------------------------
1225 */
1226static void rs_close(struct tty_struct *tty, struct file * filp)
1227{
1228 struct serial_state *state = tty->driver_data;
1229 struct tty_port *port = &state->tport;
1230
1231 if (tty_port_close_start(port, tty, filp) == 0)
1232 return;
1233
1234 /*
1235 * At this point we stop accepting input. To do this, we
1236 * disable the receive line status interrupts, and tell the
1237 * interrupt driver to stop checking the data ready bit in the
1238 * line status register.
1239 */
1240 state->read_status_mask &= ~UART_LSR_DR;
1241 if (tty_port_initialized(port)) {
1242 /* disable receive interrupts */
1243 amiga_custom.intena = IF_RBF;
1244 mb();
1245 /* clear any pending receive interrupt */
1246 amiga_custom.intreq = IF_RBF;
1247 mb();
1248
1249 /*
1250 * Before we drop DTR, make sure the UART transmitter
1251 * has completely drained; this is especially
1252 * important if there is a transmit FIFO!
1253 */
1254 rs_wait_until_sent(tty, state->timeout);
1255 }
1256 shutdown(tty, state);
1257 rs_flush_buffer(tty);
1258
1259 tty_ldisc_flush(tty);
1260 port->tty = NULL;
1261
1262 tty_port_close_end(port, tty);
1263}
1264
1265/*
1266 * rs_wait_until_sent() --- wait until the transmitter is empty
1267 */
1268static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1269{
1270 struct serial_state *info = tty->driver_data;
1271 unsigned long orig_jiffies, char_time;
1272 int lsr;
1273
1274 orig_jiffies = jiffies;
1275
1276 /*
1277 * Set the check interval to be 1/5 of the estimated time to
1278 * send a single character, and make it at least 1. The check
1279 * interval should also be less than the timeout.
1280 *
1281 * Note: we have to use pretty tight timings here to satisfy
1282 * the NIST-PCTS.
1283 */
1284 char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE;
1285 char_time = char_time / 5;
1286 if (char_time == 0)
1287 char_time = 1;
1288 if (timeout)
1289 char_time = min_t(unsigned long, char_time, timeout);
1290 /*
1291 * If the transmitter hasn't cleared in twice the approximate
1292 * amount of time to send the entire FIFO, it probably won't
1293 * ever clear. This assumes the UART isn't doing flow
1294 * control, which is currently the case. Hence, if it ever
1295 * takes longer than info->timeout, this is probably due to a
1296 * UART bug of some kind. So, we clamp the timeout parameter at
1297 * 2*info->timeout.
1298 */
1299 if (!timeout || timeout > 2*info->timeout)
1300 timeout = 2*info->timeout;
1301#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1302 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1303 printk("jiff=%lu...", jiffies);
1304#endif
1305 while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) {
1306#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1307 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1308#endif
1309 msleep_interruptible(jiffies_to_msecs(char_time));
1310 if (signal_pending(current))
1311 break;
1312 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1313 break;
1314 }
1315 __set_current_state(TASK_RUNNING);
1316
1317#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1318 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1319#endif
1320}
1321
1322/*
1323 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1324 */
1325static void rs_hangup(struct tty_struct *tty)
1326{
1327 struct serial_state *info = tty->driver_data;
1328
1329 rs_flush_buffer(tty);
1330 shutdown(tty, info);
1331 info->tport.count = 0;
1332 tty_port_set_active(&info->tport, 0);
1333 info->tport.tty = NULL;
1334 wake_up_interruptible(&info->tport.open_wait);
1335}
1336
1337/*
1338 * This routine is called whenever a serial port is opened. It
1339 * enables interrupts for a serial port, linking in its async structure into
1340 * the IRQ chain. It also performs the serial-specific
1341 * initialization for the tty structure.
1342 */
1343static int rs_open(struct tty_struct *tty, struct file * filp)
1344{
1345 struct tty_port *port = tty->port;
1346 struct serial_state *info = container_of(port, struct serial_state,
1347 tport);
1348 int retval;
1349
1350 port->count++;
1351 port->tty = tty;
1352 tty->driver_data = info;
1353
1354 retval = startup(tty, info);
1355 if (retval) {
1356 return retval;
1357 }
1358
1359 return tty_port_block_til_ready(port, tty, filp);
1360}
1361
1362/*
1363 * /proc fs routines....
1364 */
1365
1366static inline void line_info(struct seq_file *m, int line,
1367 struct serial_state *state)
1368{
1369 char stat_buf[30], control, status;
1370 unsigned long flags;
1371
1372 seq_printf(m, "%d: uart:amiga_builtin", line);
1373
1374 local_irq_save(flags);
1375 status = ciab.pra;
1376 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1377 local_irq_restore(flags);
1378
1379 stat_buf[0] = 0;
1380 stat_buf[1] = 0;
1381 if(!(control & SER_RTS))
1382 strcat(stat_buf, "|RTS");
1383 if(!(status & SER_CTS))
1384 strcat(stat_buf, "|CTS");
1385 if(!(control & SER_DTR))
1386 strcat(stat_buf, "|DTR");
1387 if(!(status & SER_DSR))
1388 strcat(stat_buf, "|DSR");
1389 if(!(status & SER_DCD))
1390 strcat(stat_buf, "|CD");
1391
1392 if (state->quot)
1393 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1394
1395 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1396
1397 if (state->icount.frame)
1398 seq_printf(m, " fe:%d", state->icount.frame);
1399
1400 if (state->icount.parity)
1401 seq_printf(m, " pe:%d", state->icount.parity);
1402
1403 if (state->icount.brk)
1404 seq_printf(m, " brk:%d", state->icount.brk);
1405
1406 if (state->icount.overrun)
1407 seq_printf(m, " oe:%d", state->icount.overrun);
1408
1409 /*
1410 * Last thing is the RS-232 status lines
1411 */
1412 seq_printf(m, " %s\n", stat_buf+1);
1413}
1414
1415static int rs_proc_show(struct seq_file *m, void *v)
1416{
1417 seq_printf(m, "serinfo:1.0 driver:4.30\n");
1418 line_info(m, 0, &serial_state);
1419 return 0;
1420}
1421
1422/*
1423 * ---------------------------------------------------------------------
1424 * rs_init() and friends
1425 *
1426 * rs_init() is called at boot-time to initialize the serial driver.
1427 * ---------------------------------------------------------------------
1428 */
1429
1430static const struct tty_operations serial_ops = {
1431 .open = rs_open,
1432 .close = rs_close,
1433 .write = rs_write,
1434 .put_char = rs_put_char,
1435 .flush_chars = rs_flush_chars,
1436 .write_room = rs_write_room,
1437 .chars_in_buffer = rs_chars_in_buffer,
1438 .flush_buffer = rs_flush_buffer,
1439 .ioctl = rs_ioctl,
1440 .throttle = rs_throttle,
1441 .unthrottle = rs_unthrottle,
1442 .set_termios = rs_set_termios,
1443 .stop = rs_stop,
1444 .start = rs_start,
1445 .hangup = rs_hangup,
1446 .break_ctl = rs_break,
1447 .send_xchar = rs_send_xchar,
1448 .wait_until_sent = rs_wait_until_sent,
1449 .tiocmget = rs_tiocmget,
1450 .tiocmset = rs_tiocmset,
1451 .get_icount = rs_get_icount,
1452 .set_serial = set_serial_info,
1453 .get_serial = get_serial_info,
1454 .proc_show = rs_proc_show,
1455};
1456
1457static int amiga_carrier_raised(struct tty_port *port)
1458{
1459 return !(ciab.pra & SER_DCD);
1460}
1461
1462static void amiga_dtr_rts(struct tty_port *port, int raise)
1463{
1464 struct serial_state *info = container_of(port, struct serial_state,
1465 tport);
1466 unsigned long flags;
1467
1468 if (raise)
1469 info->MCR |= SER_DTR|SER_RTS;
1470 else
1471 info->MCR &= ~(SER_DTR|SER_RTS);
1472
1473 local_irq_save(flags);
1474 rtsdtr_ctrl(info->MCR);
1475 local_irq_restore(flags);
1476}
1477
1478static const struct tty_port_operations amiga_port_ops = {
1479 .carrier_raised = amiga_carrier_raised,
1480 .dtr_rts = amiga_dtr_rts,
1481};
1482
1483/*
1484 * The serial driver boot-time initialization code!
1485 */
1486static int __init amiga_serial_probe(struct platform_device *pdev)
1487{
1488 struct serial_state *state = &serial_state;
1489 struct tty_driver *driver;
1490 unsigned long flags;
1491 int error;
1492
1493 driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
1494 if (IS_ERR(driver))
1495 return PTR_ERR(driver);
1496
1497 /* Initialize the tty_driver structure */
1498
1499 driver->driver_name = "amiserial";
1500 driver->name = "ttyS";
1501 driver->major = TTY_MAJOR;
1502 driver->minor_start = 64;
1503 driver->type = TTY_DRIVER_TYPE_SERIAL;
1504 driver->subtype = SERIAL_TYPE_NORMAL;
1505 driver->init_termios = tty_std_termios;
1506 driver->init_termios.c_cflag =
1507 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1508 tty_set_operations(driver, &serial_ops);
1509
1510 memset(state, 0, sizeof(*state));
1511 state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
1512 tty_port_init(&state->tport);
1513 state->tport.ops = &amiga_port_ops;
1514 tty_port_link_device(&state->tport, driver, 0);
1515
1516 error = tty_register_driver(driver);
1517 if (error)
1518 goto fail_tty_driver_kref_put;
1519
1520 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1521
1522 /* Hardware set up */
1523
1524 state->baud_base = amiga_colorclock;
1525
1526 /* set ISRs, and then disable the rx interrupts */
1527 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1528 if (error)
1529 goto fail_unregister;
1530
1531 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1532 "serial RX", state);
1533 if (error)
1534 goto fail_free_irq;
1535
1536 local_irq_save(flags);
1537
1538 /* turn off Rx and Tx interrupts */
1539 amiga_custom.intena = IF_RBF | IF_TBE;
1540 mb();
1541
1542 /* clear any pending interrupt */
1543 amiga_custom.intreq = IF_RBF | IF_TBE;
1544 mb();
1545
1546 local_irq_restore(flags);
1547
1548 /*
1549 * set the appropriate directions for the modem control flags,
1550 * and clear RTS and DTR
1551 */
1552 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1553 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1554
1555 platform_set_drvdata(pdev, state);
1556
1557 serial_driver = driver;
1558
1559 return 0;
1560
1561fail_free_irq:
1562 free_irq(IRQ_AMIGA_TBE, state);
1563fail_unregister:
1564 tty_unregister_driver(driver);
1565fail_tty_driver_kref_put:
1566 tty_port_destroy(&state->tport);
1567 tty_driver_kref_put(driver);
1568 return error;
1569}
1570
1571static int __exit amiga_serial_remove(struct platform_device *pdev)
1572{
1573 struct serial_state *state = platform_get_drvdata(pdev);
1574
1575 tty_unregister_driver(serial_driver);
1576 tty_driver_kref_put(serial_driver);
1577 tty_port_destroy(&state->tport);
1578
1579 free_irq(IRQ_AMIGA_TBE, state);
1580 free_irq(IRQ_AMIGA_RBF, state);
1581
1582 return 0;
1583}
1584
1585static struct platform_driver amiga_serial_driver = {
1586 .remove = __exit_p(amiga_serial_remove),
1587 .driver = {
1588 .name = "amiga-serial",
1589 },
1590};
1591
1592module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1593
1594
1595#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1596
1597/*
1598 * ------------------------------------------------------------
1599 * Serial console driver
1600 * ------------------------------------------------------------
1601 */
1602
1603static void amiga_serial_putc(char c)
1604{
1605 amiga_custom.serdat = (unsigned char)c | 0x100;
1606 while (!(amiga_custom.serdatr & 0x2000))
1607 barrier();
1608}
1609
1610/*
1611 * Print a string to the serial port trying not to disturb
1612 * any possible real use of the port...
1613 *
1614 * The console must be locked when we get here.
1615 */
1616static void serial_console_write(struct console *co, const char *s,
1617 unsigned count)
1618{
1619 unsigned short intena = amiga_custom.intenar;
1620
1621 amiga_custom.intena = IF_TBE;
1622
1623 while (count--) {
1624 if (*s == '\n')
1625 amiga_serial_putc('\r');
1626 amiga_serial_putc(*s++);
1627 }
1628
1629 amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
1630}
1631
1632static struct tty_driver *serial_console_device(struct console *c, int *index)
1633{
1634 *index = 0;
1635 return serial_driver;
1636}
1637
1638static struct console sercons = {
1639 .name = "ttyS",
1640 .write = serial_console_write,
1641 .device = serial_console_device,
1642 .flags = CON_PRINTBUFFER,
1643 .index = -1,
1644};
1645
1646/*
1647 * Register console.
1648 */
1649static int __init amiserial_console_init(void)
1650{
1651 if (!MACH_IS_AMIGA)
1652 return -ENODEV;
1653
1654 register_console(&sercons);
1655 return 0;
1656}
1657console_initcall(amiserial_console_init);
1658
1659#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1660
1661MODULE_LICENSE("GPL");
1662MODULE_ALIAS("platform:amiga-serial");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Serial driver for the amiga builtin port.
4 *
5 * This code was created by taking serial.c version 4.30 from kernel
6 * release 2.3.22, replacing all hardware related stuff with the
7 * corresponding amiga hardware actions, and removing all irrelevant
8 * code. As a consequence, it uses many of the constants and names
9 * associated with the registers and bits of 16550 compatible UARTS -
10 * but only to keep track of status, etc in the state variables. It
11 * was done this was to make it easier to keep the code in line with
12 * (non hardware specific) changes to serial.c.
13 *
14 * The port is registered with the tty driver as minor device 64, and
15 * therefore other ports should should only use 65 upwards.
16 *
17 * Richard Lucock 28/12/99
18 *
19 * Copyright (C) 1991, 1992 Linus Torvalds
20 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
21 * 1998, 1999 Theodore Ts'o
22 *
23 */
24
25/*
26 * Serial driver configuration section. Here are the various options:
27 *
28 * SERIAL_PARANOIA_CHECK
29 * Check the magic number for the async_structure where
30 * ever possible.
31 */
32
33#include <linux/delay.h>
34
35#undef SERIAL_PARANOIA_CHECK
36
37/* Set of debugging defines */
38
39#undef SERIAL_DEBUG_INTR
40#undef SERIAL_DEBUG_OPEN
41#undef SERIAL_DEBUG_FLOW
42#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
43
44/* Sanity checks */
45
46#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
47#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
48 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
49#else
50#define DBG_CNT(s)
51#endif
52
53/*
54 * End of serial driver configuration section.
55 */
56
57#include <linux/module.h>
58
59#include <linux/types.h>
60#include <linux/serial.h>
61#include <linux/serial_reg.h>
62static char *serial_version = "4.30";
63
64#include <linux/errno.h>
65#include <linux/signal.h>
66#include <linux/sched.h>
67#include <linux/kernel.h>
68#include <linux/timer.h>
69#include <linux/interrupt.h>
70#include <linux/tty.h>
71#include <linux/tty_flip.h>
72#include <linux/circ_buf.h>
73#include <linux/console.h>
74#include <linux/major.h>
75#include <linux/string.h>
76#include <linux/fcntl.h>
77#include <linux/ptrace.h>
78#include <linux/ioport.h>
79#include <linux/mm.h>
80#include <linux/seq_file.h>
81#include <linux/slab.h>
82#include <linux/init.h>
83#include <linux/bitops.h>
84#include <linux/platform_device.h>
85
86#include <asm/setup.h>
87
88
89#include <asm/irq.h>
90
91#include <asm/amigahw.h>
92#include <asm/amigaints.h>
93
94struct serial_state {
95 struct tty_port tport;
96 struct circ_buf xmit;
97 struct async_icount icount;
98
99 unsigned long port;
100 int baud_base;
101 int xmit_fifo_size;
102 int custom_divisor;
103 int read_status_mask;
104 int ignore_status_mask;
105 int timeout;
106 int quot;
107 int IER; /* Interrupt Enable Register */
108 int MCR; /* Modem control register */
109 int x_char; /* xon/xoff character */
110};
111
112#define custom amiga_custom
113static char *serial_name = "Amiga-builtin serial driver";
114
115static struct tty_driver *serial_driver;
116
117/* number of characters left in xmit buffer before we ask for more */
118#define WAKEUP_CHARS 256
119
120static unsigned char current_ctl_bits;
121
122static void change_speed(struct tty_struct *tty, struct serial_state *info,
123 struct ktermios *old);
124static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
125
126
127static struct serial_state rs_table[1];
128
129#define NR_PORTS ARRAY_SIZE(rs_table)
130
131#include <linux/uaccess.h>
132
133#define serial_isroot() (capable(CAP_SYS_ADMIN))
134
135
136static inline int serial_paranoia_check(struct serial_state *info,
137 char *name, const char *routine)
138{
139#ifdef SERIAL_PARANOIA_CHECK
140 static const char *badmagic =
141 "Warning: bad magic number for serial struct (%s) in %s\n";
142 static const char *badinfo =
143 "Warning: null async_struct for (%s) in %s\n";
144
145 if (!info) {
146 printk(badinfo, name, routine);
147 return 1;
148 }
149 if (info->magic != SERIAL_MAGIC) {
150 printk(badmagic, name, routine);
151 return 1;
152 }
153#endif
154 return 0;
155}
156
157/* some serial hardware definitions */
158#define SDR_OVRUN (1<<15)
159#define SDR_RBF (1<<14)
160#define SDR_TBE (1<<13)
161#define SDR_TSRE (1<<12)
162
163#define SERPER_PARENB (1<<15)
164
165#define AC_SETCLR (1<<15)
166#define AC_UARTBRK (1<<11)
167
168#define SER_DTR (1<<7)
169#define SER_RTS (1<<6)
170#define SER_DCD (1<<5)
171#define SER_CTS (1<<4)
172#define SER_DSR (1<<3)
173
174static __inline__ void rtsdtr_ctrl(int bits)
175{
176 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
177}
178
179/*
180 * ------------------------------------------------------------
181 * rs_stop() and rs_start()
182 *
183 * This routines are called before setting or resetting tty->stopped.
184 * They enable or disable transmitter interrupts, as necessary.
185 * ------------------------------------------------------------
186 */
187static void rs_stop(struct tty_struct *tty)
188{
189 struct serial_state *info = tty->driver_data;
190 unsigned long flags;
191
192 if (serial_paranoia_check(info, tty->name, "rs_stop"))
193 return;
194
195 local_irq_save(flags);
196 if (info->IER & UART_IER_THRI) {
197 info->IER &= ~UART_IER_THRI;
198 /* disable Tx interrupt and remove any pending interrupts */
199 custom.intena = IF_TBE;
200 mb();
201 custom.intreq = IF_TBE;
202 mb();
203 }
204 local_irq_restore(flags);
205}
206
207static void rs_start(struct tty_struct *tty)
208{
209 struct serial_state *info = tty->driver_data;
210 unsigned long flags;
211
212 if (serial_paranoia_check(info, tty->name, "rs_start"))
213 return;
214
215 local_irq_save(flags);
216 if (info->xmit.head != info->xmit.tail
217 && info->xmit.buf
218 && !(info->IER & UART_IER_THRI)) {
219 info->IER |= UART_IER_THRI;
220 custom.intena = IF_SETCLR | IF_TBE;
221 mb();
222 /* set a pending Tx Interrupt, transmitter should restart now */
223 custom.intreq = IF_SETCLR | IF_TBE;
224 mb();
225 }
226 local_irq_restore(flags);
227}
228
229/*
230 * ----------------------------------------------------------------------
231 *
232 * Here starts the interrupt handling routines. All of the following
233 * subroutines are declared as inline and are folded into
234 * rs_interrupt(). They were separated out for readability's sake.
235 *
236 * Note: rs_interrupt() is a "fast" interrupt, which means that it
237 * runs with interrupts turned off. People who may want to modify
238 * rs_interrupt() should try to keep the interrupt handler as fast as
239 * possible. After you are done making modifications, it is not a bad
240 * idea to do:
241 *
242 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
243 *
244 * and look at the resulting assemble code in serial.s.
245 *
246 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
247 * -----------------------------------------------------------------------
248 */
249
250static void receive_chars(struct serial_state *info)
251{
252 int status;
253 int serdatr;
254 unsigned char ch, flag;
255 struct async_icount *icount;
256 int oe = 0;
257
258 icount = &info->icount;
259
260 status = UART_LSR_DR; /* We obviously have a character! */
261 serdatr = custom.serdatr;
262 mb();
263 custom.intreq = IF_RBF;
264 mb();
265
266 if((serdatr & 0x1ff) == 0)
267 status |= UART_LSR_BI;
268 if(serdatr & SDR_OVRUN)
269 status |= UART_LSR_OE;
270
271 ch = serdatr & 0xff;
272 icount->rx++;
273
274#ifdef SERIAL_DEBUG_INTR
275 printk("DR%02x:%02x...", ch, status);
276#endif
277 flag = TTY_NORMAL;
278
279 /*
280 * We don't handle parity or frame errors - but I have left
281 * the code in, since I'm not sure that the errors can't be
282 * detected.
283 */
284
285 if (status & (UART_LSR_BI | UART_LSR_PE |
286 UART_LSR_FE | UART_LSR_OE)) {
287 /*
288 * For statistics only
289 */
290 if (status & UART_LSR_BI) {
291 status &= ~(UART_LSR_FE | UART_LSR_PE);
292 icount->brk++;
293 } else if (status & UART_LSR_PE)
294 icount->parity++;
295 else if (status & UART_LSR_FE)
296 icount->frame++;
297 if (status & UART_LSR_OE)
298 icount->overrun++;
299
300 /*
301 * Now check to see if character should be
302 * ignored, and mask off conditions which
303 * should be ignored.
304 */
305 if (status & info->ignore_status_mask)
306 goto out;
307
308 status &= info->read_status_mask;
309
310 if (status & (UART_LSR_BI)) {
311#ifdef SERIAL_DEBUG_INTR
312 printk("handling break....");
313#endif
314 flag = TTY_BREAK;
315 if (info->tport.flags & ASYNC_SAK)
316 do_SAK(info->tport.tty);
317 } else if (status & UART_LSR_PE)
318 flag = TTY_PARITY;
319 else if (status & UART_LSR_FE)
320 flag = TTY_FRAME;
321 if (status & UART_LSR_OE) {
322 /*
323 * Overrun is special, since it's
324 * reported immediately, and doesn't
325 * affect the current character
326 */
327 oe = 1;
328 }
329 }
330 tty_insert_flip_char(&info->tport, ch, flag);
331 if (oe == 1)
332 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
333 tty_flip_buffer_push(&info->tport);
334out:
335 return;
336}
337
338static void transmit_chars(struct serial_state *info)
339{
340 custom.intreq = IF_TBE;
341 mb();
342 if (info->x_char) {
343 custom.serdat = info->x_char | 0x100;
344 mb();
345 info->icount.tx++;
346 info->x_char = 0;
347 return;
348 }
349 if (info->xmit.head == info->xmit.tail
350 || info->tport.tty->stopped
351 || info->tport.tty->hw_stopped) {
352 info->IER &= ~UART_IER_THRI;
353 custom.intena = IF_TBE;
354 mb();
355 return;
356 }
357
358 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
359 mb();
360 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
361 info->icount.tx++;
362
363 if (CIRC_CNT(info->xmit.head,
364 info->xmit.tail,
365 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
366 tty_wakeup(info->tport.tty);
367
368#ifdef SERIAL_DEBUG_INTR
369 printk("THRE...");
370#endif
371 if (info->xmit.head == info->xmit.tail) {
372 custom.intena = IF_TBE;
373 mb();
374 info->IER &= ~UART_IER_THRI;
375 }
376}
377
378static void check_modem_status(struct serial_state *info)
379{
380 struct tty_port *port = &info->tport;
381 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
382 unsigned char dstatus;
383 struct async_icount *icount;
384
385 /* Determine bits that have changed */
386 dstatus = status ^ current_ctl_bits;
387 current_ctl_bits = status;
388
389 if (dstatus) {
390 icount = &info->icount;
391 /* update input line counters */
392 if (dstatus & SER_DSR)
393 icount->dsr++;
394 if (dstatus & SER_DCD) {
395 icount->dcd++;
396 }
397 if (dstatus & SER_CTS)
398 icount->cts++;
399 wake_up_interruptible(&port->delta_msr_wait);
400 }
401
402 if (tty_port_check_carrier(port) && (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(&port->open_wait);
409 else {
410#ifdef SERIAL_DEBUG_OPEN
411 printk("doing serial hangup...");
412#endif
413 if (port->tty)
414 tty_hangup(port->tty);
415 }
416 }
417 if (tty_port_cts_enabled(port)) {
418 if (port->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 port->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 tty_wakeup(port->tty);
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 port->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 serial_state *info = data;
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 serial_state *info = dev_id;
466
467#ifdef SERIAL_DEBUG_INTR
468 printk("ser_rx_int...");
469#endif
470
471 if (!info->tport.tty)
472 return IRQ_NONE;
473
474 receive_chars(info);
475#ifdef SERIAL_DEBUG_INTR
476 printk("end.\n");
477#endif
478 return IRQ_HANDLED;
479}
480
481static irqreturn_t ser_tx_int(int irq, void *dev_id)
482{
483 struct serial_state *info = dev_id;
484
485 if (custom.serdatr & SDR_TBE) {
486#ifdef SERIAL_DEBUG_INTR
487 printk("ser_tx_int...");
488#endif
489
490 if (!info->tport.tty)
491 return IRQ_NONE;
492
493 transmit_chars(info);
494#ifdef SERIAL_DEBUG_INTR
495 printk("end.\n");
496#endif
497 }
498 return IRQ_HANDLED;
499}
500
501/*
502 * -------------------------------------------------------------------
503 * Here ends the serial interrupt routines.
504 * -------------------------------------------------------------------
505 */
506
507/*
508 * ---------------------------------------------------------------
509 * Low level utility subroutines for the serial driver: routines to
510 * figure out the appropriate timeout for an interrupt chain, routines
511 * to initialize and startup a serial port, and routines to shutdown a
512 * serial port. Useful stuff like that.
513 * ---------------------------------------------------------------
514 */
515
516static int startup(struct tty_struct *tty, struct serial_state *info)
517{
518 struct tty_port *port = &info->tport;
519 unsigned long flags;
520 int retval=0;
521 unsigned long page;
522
523 page = get_zeroed_page(GFP_KERNEL);
524 if (!page)
525 return -ENOMEM;
526
527 local_irq_save(flags);
528
529 if (tty_port_initialized(port)) {
530 free_page(page);
531 goto errout;
532 }
533
534 if (info->xmit.buf)
535 free_page(page);
536 else
537 info->xmit.buf = (unsigned char *) page;
538
539#ifdef SERIAL_DEBUG_OPEN
540 printk("starting up ttys%d ...", info->line);
541#endif
542
543 /* Clear anything in the input buffer */
544
545 custom.intreq = IF_RBF;
546 mb();
547
548 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
549 if (retval) {
550 if (serial_isroot()) {
551 set_bit(TTY_IO_ERROR, &tty->flags);
552 retval = 0;
553 }
554 goto errout;
555 }
556
557 /* enable both Rx and Tx interrupts */
558 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
559 mb();
560 info->IER = UART_IER_MSI;
561
562 /* remember current state of the DCD and CTS bits */
563 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
564
565 info->MCR = 0;
566 if (C_BAUD(tty))
567 info->MCR = SER_DTR | SER_RTS;
568 rtsdtr_ctrl(info->MCR);
569
570 clear_bit(TTY_IO_ERROR, &tty->flags);
571 info->xmit.head = info->xmit.tail = 0;
572
573 /*
574 * and set the speed of the serial port
575 */
576 change_speed(tty, info, NULL);
577
578 tty_port_set_initialized(port, 1);
579 local_irq_restore(flags);
580 return 0;
581
582errout:
583 local_irq_restore(flags);
584 return retval;
585}
586
587/*
588 * This routine will shutdown a serial port; interrupts are disabled, and
589 * DTR is dropped if the hangup on close termio flag is on.
590 */
591static void shutdown(struct tty_struct *tty, struct serial_state *info)
592{
593 unsigned long flags;
594 struct serial_state *state;
595
596 if (!tty_port_initialized(&info->tport))
597 return;
598
599 state = info;
600
601#ifdef SERIAL_DEBUG_OPEN
602 printk("Shutting down serial port %d ....\n", info->line);
603#endif
604
605 local_irq_save(flags); /* Disable interrupts */
606
607 /*
608 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
609 * here so the queue might never be waken up
610 */
611 wake_up_interruptible(&info->tport.delta_msr_wait);
612
613 /*
614 * Free the IRQ, if necessary
615 */
616 free_irq(IRQ_AMIGA_VERTB, info);
617
618 if (info->xmit.buf) {
619 free_page((unsigned long) info->xmit.buf);
620 info->xmit.buf = NULL;
621 }
622
623 info->IER = 0;
624 custom.intena = IF_RBF | IF_TBE;
625 mb();
626
627 /* disable break condition */
628 custom.adkcon = AC_UARTBRK;
629 mb();
630
631 if (C_HUPCL(tty))
632 info->MCR &= ~(SER_DTR|SER_RTS);
633 rtsdtr_ctrl(info->MCR);
634
635 set_bit(TTY_IO_ERROR, &tty->flags);
636
637 tty_port_set_initialized(&info->tport, 0);
638 local_irq_restore(flags);
639}
640
641
642/*
643 * This routine is called to set the UART divisor registers to match
644 * the specified baud rate for a serial port.
645 */
646static void change_speed(struct tty_struct *tty, struct serial_state *info,
647 struct ktermios *old_termios)
648{
649 struct tty_port *port = &info->tport;
650 int quot = 0, baud_base, baud;
651 unsigned cflag, cval = 0;
652 int bits;
653 unsigned long flags;
654
655 cflag = tty->termios.c_cflag;
656
657 /* Byte size is always 8 bits plus parity bit if requested */
658
659 cval = 3; bits = 10;
660 if (cflag & CSTOPB) {
661 cval |= 0x04;
662 bits++;
663 }
664 if (cflag & PARENB) {
665 cval |= UART_LCR_PARITY;
666 bits++;
667 }
668 if (!(cflag & PARODD))
669 cval |= UART_LCR_EPAR;
670#ifdef CMSPAR
671 if (cflag & CMSPAR)
672 cval |= UART_LCR_SPAR;
673#endif
674
675 /* Determine divisor based on baud rate */
676 baud = tty_get_baud_rate(tty);
677 if (!baud)
678 baud = 9600; /* B0 transition handled in rs_set_termios */
679 baud_base = info->baud_base;
680 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
681 quot = info->custom_divisor;
682 else {
683 if (baud == 134)
684 /* Special case since 134 is really 134.5 */
685 quot = (2*baud_base / 269);
686 else if (baud)
687 quot = baud_base / baud;
688 }
689 /* If the quotient is zero refuse the change */
690 if (!quot && old_termios) {
691 /* FIXME: Will need updating for new tty in the end */
692 tty->termios.c_cflag &= ~CBAUD;
693 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
694 baud = tty_get_baud_rate(tty);
695 if (!baud)
696 baud = 9600;
697 if (baud == 38400 &&
698 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
699 quot = info->custom_divisor;
700 else {
701 if (baud == 134)
702 /* Special case since 134 is really 134.5 */
703 quot = (2*baud_base / 269);
704 else if (baud)
705 quot = baud_base / baud;
706 }
707 }
708 /* As a last resort, if the quotient is zero, default to 9600 bps */
709 if (!quot)
710 quot = baud_base / 9600;
711 info->quot = quot;
712 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
713 info->timeout += HZ/50; /* Add .02 seconds of slop */
714
715 /* CTS flow control flag and modem status interrupts */
716 info->IER &= ~UART_IER_MSI;
717 if (port->flags & ASYNC_HARDPPS_CD)
718 info->IER |= UART_IER_MSI;
719 tty_port_set_cts_flow(port, cflag & CRTSCTS);
720 if (cflag & CRTSCTS)
721 info->IER |= UART_IER_MSI;
722 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
723 if (~cflag & CLOCAL)
724 info->IER |= UART_IER_MSI;
725 /* TBD:
726 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
727 */
728
729 /*
730 * Set up parity check flag
731 */
732
733 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
734 if (I_INPCK(tty))
735 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
736 if (I_BRKINT(tty) || I_PARMRK(tty))
737 info->read_status_mask |= UART_LSR_BI;
738
739 /*
740 * Characters to ignore
741 */
742 info->ignore_status_mask = 0;
743 if (I_IGNPAR(tty))
744 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
745 if (I_IGNBRK(tty)) {
746 info->ignore_status_mask |= UART_LSR_BI;
747 /*
748 * If we're ignore parity and break indicators, ignore
749 * overruns too. (For real raw support).
750 */
751 if (I_IGNPAR(tty))
752 info->ignore_status_mask |= UART_LSR_OE;
753 }
754 /*
755 * !!! ignore all characters if CREAD is not set
756 */
757 if ((cflag & CREAD) == 0)
758 info->ignore_status_mask |= UART_LSR_DR;
759 local_irq_save(flags);
760
761 {
762 short serper;
763
764 /* Set up the baud rate */
765 serper = quot - 1;
766
767 /* Enable or disable parity bit */
768
769 if(cval & UART_LCR_PARITY)
770 serper |= (SERPER_PARENB);
771
772 custom.serper = serper;
773 mb();
774 }
775
776 local_irq_restore(flags);
777}
778
779static int rs_put_char(struct tty_struct *tty, unsigned char ch)
780{
781 struct serial_state *info;
782 unsigned long flags;
783
784 info = tty->driver_data;
785
786 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
787 return 0;
788
789 if (!info->xmit.buf)
790 return 0;
791
792 local_irq_save(flags);
793 if (CIRC_SPACE(info->xmit.head,
794 info->xmit.tail,
795 SERIAL_XMIT_SIZE) == 0) {
796 local_irq_restore(flags);
797 return 0;
798 }
799
800 info->xmit.buf[info->xmit.head++] = ch;
801 info->xmit.head &= SERIAL_XMIT_SIZE-1;
802 local_irq_restore(flags);
803 return 1;
804}
805
806static void rs_flush_chars(struct tty_struct *tty)
807{
808 struct serial_state *info = tty->driver_data;
809 unsigned long flags;
810
811 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
812 return;
813
814 if (info->xmit.head == info->xmit.tail
815 || tty->stopped
816 || tty->hw_stopped
817 || !info->xmit.buf)
818 return;
819
820 local_irq_save(flags);
821 info->IER |= UART_IER_THRI;
822 custom.intena = IF_SETCLR | IF_TBE;
823 mb();
824 /* set a pending Tx Interrupt, transmitter should restart now */
825 custom.intreq = IF_SETCLR | IF_TBE;
826 mb();
827 local_irq_restore(flags);
828}
829
830static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
831{
832 int c, ret = 0;
833 struct serial_state *info = tty->driver_data;
834 unsigned long flags;
835
836 if (serial_paranoia_check(info, tty->name, "rs_write"))
837 return 0;
838
839 if (!info->xmit.buf)
840 return 0;
841
842 local_irq_save(flags);
843 while (1) {
844 c = CIRC_SPACE_TO_END(info->xmit.head,
845 info->xmit.tail,
846 SERIAL_XMIT_SIZE);
847 if (count < c)
848 c = count;
849 if (c <= 0) {
850 break;
851 }
852 memcpy(info->xmit.buf + info->xmit.head, buf, c);
853 info->xmit.head = ((info->xmit.head + c) &
854 (SERIAL_XMIT_SIZE-1));
855 buf += c;
856 count -= c;
857 ret += c;
858 }
859 local_irq_restore(flags);
860
861 if (info->xmit.head != info->xmit.tail
862 && !tty->stopped
863 && !tty->hw_stopped
864 && !(info->IER & UART_IER_THRI)) {
865 info->IER |= UART_IER_THRI;
866 local_irq_disable();
867 custom.intena = IF_SETCLR | IF_TBE;
868 mb();
869 /* set a pending Tx Interrupt, transmitter should restart now */
870 custom.intreq = IF_SETCLR | IF_TBE;
871 mb();
872 local_irq_restore(flags);
873 }
874 return ret;
875}
876
877static int rs_write_room(struct tty_struct *tty)
878{
879 struct serial_state *info = tty->driver_data;
880
881 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
882 return 0;
883 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
884}
885
886static int rs_chars_in_buffer(struct tty_struct *tty)
887{
888 struct serial_state *info = tty->driver_data;
889
890 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
891 return 0;
892 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
893}
894
895static void rs_flush_buffer(struct tty_struct *tty)
896{
897 struct serial_state *info = tty->driver_data;
898 unsigned long flags;
899
900 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
901 return;
902 local_irq_save(flags);
903 info->xmit.head = info->xmit.tail = 0;
904 local_irq_restore(flags);
905 tty_wakeup(tty);
906}
907
908/*
909 * This function is used to send a high-priority XON/XOFF character to
910 * the device
911 */
912static void rs_send_xchar(struct tty_struct *tty, char ch)
913{
914 struct serial_state *info = tty->driver_data;
915 unsigned long flags;
916
917 if (serial_paranoia_check(info, tty->name, "rs_send_xchar"))
918 return;
919
920 info->x_char = ch;
921 if (ch) {
922 /* Make sure transmit interrupts are on */
923
924 /* Check this ! */
925 local_irq_save(flags);
926 if(!(custom.intenar & IF_TBE)) {
927 custom.intena = IF_SETCLR | IF_TBE;
928 mb();
929 /* set a pending Tx Interrupt, transmitter should restart now */
930 custom.intreq = IF_SETCLR | IF_TBE;
931 mb();
932 }
933 local_irq_restore(flags);
934
935 info->IER |= UART_IER_THRI;
936 }
937}
938
939/*
940 * ------------------------------------------------------------
941 * rs_throttle()
942 *
943 * This routine is called by the upper-layer tty layer to signal that
944 * incoming characters should be throttled.
945 * ------------------------------------------------------------
946 */
947static void rs_throttle(struct tty_struct * tty)
948{
949 struct serial_state *info = tty->driver_data;
950 unsigned long flags;
951#ifdef SERIAL_DEBUG_THROTTLE
952 printk("throttle %s ....\n", tty_name(tty));
953#endif
954
955 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
956 return;
957
958 if (I_IXOFF(tty))
959 rs_send_xchar(tty, STOP_CHAR(tty));
960
961 if (C_CRTSCTS(tty))
962 info->MCR &= ~SER_RTS;
963
964 local_irq_save(flags);
965 rtsdtr_ctrl(info->MCR);
966 local_irq_restore(flags);
967}
968
969static void rs_unthrottle(struct tty_struct * tty)
970{
971 struct serial_state *info = tty->driver_data;
972 unsigned long flags;
973#ifdef SERIAL_DEBUG_THROTTLE
974 printk("unthrottle %s ....\n", tty_name(tty));
975#endif
976
977 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
978 return;
979
980 if (I_IXOFF(tty)) {
981 if (info->x_char)
982 info->x_char = 0;
983 else
984 rs_send_xchar(tty, START_CHAR(tty));
985 }
986 if (C_CRTSCTS(tty))
987 info->MCR |= SER_RTS;
988 local_irq_save(flags);
989 rtsdtr_ctrl(info->MCR);
990 local_irq_restore(flags);
991}
992
993/*
994 * ------------------------------------------------------------
995 * rs_ioctl() and friends
996 * ------------------------------------------------------------
997 */
998
999static int get_serial_info(struct tty_struct *tty, struct serial_state *state,
1000 struct serial_struct __user * retinfo)
1001{
1002 struct serial_struct tmp;
1003
1004 memset(&tmp, 0, sizeof(tmp));
1005 tty_lock(tty);
1006 tmp.line = tty->index;
1007 tmp.port = state->port;
1008 tmp.flags = state->tport.flags;
1009 tmp.xmit_fifo_size = state->xmit_fifo_size;
1010 tmp.baud_base = state->baud_base;
1011 tmp.close_delay = state->tport.close_delay;
1012 tmp.closing_wait = state->tport.closing_wait;
1013 tmp.custom_divisor = state->custom_divisor;
1014 tty_unlock(tty);
1015 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1016 return -EFAULT;
1017 return 0;
1018}
1019
1020static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
1021 struct serial_struct __user * new_info)
1022{
1023 struct tty_port *port = &state->tport;
1024 struct serial_struct new_serial;
1025 bool change_spd;
1026 int retval = 0;
1027
1028 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1029 return -EFAULT;
1030
1031 tty_lock(tty);
1032 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
1033 new_serial.custom_divisor != state->custom_divisor;
1034 if (new_serial.irq || new_serial.port != state->port ||
1035 new_serial.xmit_fifo_size != state->xmit_fifo_size) {
1036 tty_unlock(tty);
1037 return -EINVAL;
1038 }
1039
1040 if (!serial_isroot()) {
1041 if ((new_serial.baud_base != state->baud_base) ||
1042 (new_serial.close_delay != port->close_delay) ||
1043 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1044 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1045 (port->flags & ~ASYNC_USR_MASK))) {
1046 tty_unlock(tty);
1047 return -EPERM;
1048 }
1049 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1050 (new_serial.flags & ASYNC_USR_MASK));
1051 state->custom_divisor = new_serial.custom_divisor;
1052 goto check_and_exit;
1053 }
1054
1055 if (new_serial.baud_base < 9600) {
1056 tty_unlock(tty);
1057 return -EINVAL;
1058 }
1059
1060 /*
1061 * OK, past this point, all the error checking has been done.
1062 * At this point, we start making changes.....
1063 */
1064
1065 state->baud_base = new_serial.baud_base;
1066 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1067 (new_serial.flags & ASYNC_FLAGS));
1068 state->custom_divisor = new_serial.custom_divisor;
1069 port->close_delay = new_serial.close_delay * HZ/100;
1070 port->closing_wait = new_serial.closing_wait * HZ/100;
1071 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1072
1073check_and_exit:
1074 if (tty_port_initialized(port)) {
1075 if (change_spd) {
1076 /* warn about deprecation unless clearing */
1077 if (new_serial.flags & ASYNC_SPD_MASK)
1078 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
1079 change_speed(tty, state, NULL);
1080 }
1081 } else
1082 retval = startup(tty, state);
1083 tty_unlock(tty);
1084 return retval;
1085}
1086
1087
1088/*
1089 * get_lsr_info - get line status register info
1090 *
1091 * Purpose: Let user call ioctl() to get info when the UART physically
1092 * is emptied. On bus types like RS485, the transmitter must
1093 * release the bus after transmitting. This must be done when
1094 * the transmit shift register is empty, not be done when the
1095 * transmit holding register is empty. This functionality
1096 * allows an RS485 driver to be written in user space.
1097 */
1098static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1099{
1100 unsigned char status;
1101 unsigned int result;
1102 unsigned long flags;
1103
1104 local_irq_save(flags);
1105 status = custom.serdatr;
1106 mb();
1107 local_irq_restore(flags);
1108 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1109 if (copy_to_user(value, &result, sizeof(int)))
1110 return -EFAULT;
1111 return 0;
1112}
1113
1114
1115static int rs_tiocmget(struct tty_struct *tty)
1116{
1117 struct serial_state *info = tty->driver_data;
1118 unsigned char control, status;
1119 unsigned long flags;
1120
1121 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1122 return -ENODEV;
1123 if (tty_io_error(tty))
1124 return -EIO;
1125
1126 control = info->MCR;
1127 local_irq_save(flags);
1128 status = ciab.pra;
1129 local_irq_restore(flags);
1130 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1131 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1132 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1133 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1134 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1135}
1136
1137static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1138 unsigned int clear)
1139{
1140 struct serial_state *info = tty->driver_data;
1141 unsigned long flags;
1142
1143 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1144 return -ENODEV;
1145 if (tty_io_error(tty))
1146 return -EIO;
1147
1148 local_irq_save(flags);
1149 if (set & TIOCM_RTS)
1150 info->MCR |= SER_RTS;
1151 if (set & TIOCM_DTR)
1152 info->MCR |= SER_DTR;
1153 if (clear & TIOCM_RTS)
1154 info->MCR &= ~SER_RTS;
1155 if (clear & TIOCM_DTR)
1156 info->MCR &= ~SER_DTR;
1157 rtsdtr_ctrl(info->MCR);
1158 local_irq_restore(flags);
1159 return 0;
1160}
1161
1162/*
1163 * rs_break() --- routine which turns the break handling on or off
1164 */
1165static int rs_break(struct tty_struct *tty, int break_state)
1166{
1167 struct serial_state *info = tty->driver_data;
1168 unsigned long flags;
1169
1170 if (serial_paranoia_check(info, tty->name, "rs_break"))
1171 return -EINVAL;
1172
1173 local_irq_save(flags);
1174 if (break_state == -1)
1175 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1176 else
1177 custom.adkcon = AC_UARTBRK;
1178 mb();
1179 local_irq_restore(flags);
1180 return 0;
1181}
1182
1183/*
1184 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1185 * Return: write counters to the user passed counter struct
1186 * NB: both 1->0 and 0->1 transitions are counted except for
1187 * RI where only 0->1 is counted.
1188 */
1189static int rs_get_icount(struct tty_struct *tty,
1190 struct serial_icounter_struct *icount)
1191{
1192 struct serial_state *info = tty->driver_data;
1193 struct async_icount cnow;
1194 unsigned long flags;
1195
1196 local_irq_save(flags);
1197 cnow = info->icount;
1198 local_irq_restore(flags);
1199 icount->cts = cnow.cts;
1200 icount->dsr = cnow.dsr;
1201 icount->rng = cnow.rng;
1202 icount->dcd = cnow.dcd;
1203 icount->rx = cnow.rx;
1204 icount->tx = cnow.tx;
1205 icount->frame = cnow.frame;
1206 icount->overrun = cnow.overrun;
1207 icount->parity = cnow.parity;
1208 icount->brk = cnow.brk;
1209 icount->buf_overrun = cnow.buf_overrun;
1210
1211 return 0;
1212}
1213
1214static int rs_ioctl(struct tty_struct *tty,
1215 unsigned int cmd, unsigned long arg)
1216{
1217 struct serial_state *info = tty->driver_data;
1218 struct async_icount cprev, cnow; /* kernel counter temps */
1219 void __user *argp = (void __user *)arg;
1220 unsigned long flags;
1221 DEFINE_WAIT(wait);
1222 int ret;
1223
1224 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1225 return -ENODEV;
1226
1227 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1228 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1229 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1230 if (tty_io_error(tty))
1231 return -EIO;
1232 }
1233
1234 switch (cmd) {
1235 case TIOCGSERIAL:
1236 return get_serial_info(tty, info, argp);
1237 case TIOCSSERIAL:
1238 return set_serial_info(tty, info, argp);
1239 case TIOCSERCONFIG:
1240 return 0;
1241
1242 case TIOCSERGETLSR: /* Get line status register */
1243 return get_lsr_info(info, argp);
1244
1245 case TIOCSERGSTRUCT:
1246 if (copy_to_user(argp,
1247 info, sizeof(struct serial_state)))
1248 return -EFAULT;
1249 return 0;
1250
1251 /*
1252 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1253 * - mask passed in arg for lines of interest
1254 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1255 * Caller should use TIOCGICOUNT to see which one it was
1256 */
1257 case TIOCMIWAIT:
1258 local_irq_save(flags);
1259 /* note the counters on entry */
1260 cprev = info->icount;
1261 local_irq_restore(flags);
1262 while (1) {
1263 prepare_to_wait(&info->tport.delta_msr_wait,
1264 &wait, TASK_INTERRUPTIBLE);
1265 local_irq_save(flags);
1266 cnow = info->icount; /* atomic copy */
1267 local_irq_restore(flags);
1268 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1269 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1270 ret = -EIO; /* no change => error */
1271 break;
1272 }
1273 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1274 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1275 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1276 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1277 ret = 0;
1278 break;
1279 }
1280 schedule();
1281 /* see if a signal did it */
1282 if (signal_pending(current)) {
1283 ret = -ERESTARTSYS;
1284 break;
1285 }
1286 cprev = cnow;
1287 }
1288 finish_wait(&info->tport.delta_msr_wait, &wait);
1289 return ret;
1290
1291 case TIOCSERGWILD:
1292 case TIOCSERSWILD:
1293 /* "setserial -W" is called in Debian boot */
1294 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1295 return 0;
1296
1297 default:
1298 return -ENOIOCTLCMD;
1299 }
1300 return 0;
1301}
1302
1303static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1304{
1305 struct serial_state *info = tty->driver_data;
1306 unsigned long flags;
1307 unsigned int cflag = tty->termios.c_cflag;
1308
1309 change_speed(tty, info, old_termios);
1310
1311 /* Handle transition to B0 status */
1312 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1313 info->MCR &= ~(SER_DTR|SER_RTS);
1314 local_irq_save(flags);
1315 rtsdtr_ctrl(info->MCR);
1316 local_irq_restore(flags);
1317 }
1318
1319 /* Handle transition away from B0 status */
1320 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1321 info->MCR |= SER_DTR;
1322 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1323 info->MCR |= SER_RTS;
1324 local_irq_save(flags);
1325 rtsdtr_ctrl(info->MCR);
1326 local_irq_restore(flags);
1327 }
1328
1329 /* Handle turning off CRTSCTS */
1330 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1331 tty->hw_stopped = 0;
1332 rs_start(tty);
1333 }
1334
1335#if 0
1336 /*
1337 * No need to wake up processes in open wait, since they
1338 * sample the CLOCAL flag once, and don't recheck it.
1339 * XXX It's not clear whether the current behavior is correct
1340 * or not. Hence, this may change.....
1341 */
1342 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1343 wake_up_interruptible(&info->open_wait);
1344#endif
1345}
1346
1347/*
1348 * ------------------------------------------------------------
1349 * rs_close()
1350 *
1351 * This routine is called when the serial port gets closed. First, we
1352 * wait for the last remaining data to be sent. Then, we unlink its
1353 * async structure from the interrupt chain if necessary, and we free
1354 * that IRQ if nothing is left in the chain.
1355 * ------------------------------------------------------------
1356 */
1357static void rs_close(struct tty_struct *tty, struct file * filp)
1358{
1359 struct serial_state *state = tty->driver_data;
1360 struct tty_port *port = &state->tport;
1361
1362 if (serial_paranoia_check(state, tty->name, "rs_close"))
1363 return;
1364
1365 if (tty_port_close_start(port, tty, filp) == 0)
1366 return;
1367
1368 /*
1369 * At this point we stop accepting input. To do this, we
1370 * disable the receive line status interrupts, and tell the
1371 * interrupt driver to stop checking the data ready bit in the
1372 * line status register.
1373 */
1374 state->read_status_mask &= ~UART_LSR_DR;
1375 if (tty_port_initialized(port)) {
1376 /* disable receive interrupts */
1377 custom.intena = IF_RBF;
1378 mb();
1379 /* clear any pending receive interrupt */
1380 custom.intreq = IF_RBF;
1381 mb();
1382
1383 /*
1384 * Before we drop DTR, make sure the UART transmitter
1385 * has completely drained; this is especially
1386 * important if there is a transmit FIFO!
1387 */
1388 rs_wait_until_sent(tty, state->timeout);
1389 }
1390 shutdown(tty, state);
1391 rs_flush_buffer(tty);
1392
1393 tty_ldisc_flush(tty);
1394 port->tty = NULL;
1395
1396 tty_port_close_end(port, tty);
1397}
1398
1399/*
1400 * rs_wait_until_sent() --- wait until the transmitter is empty
1401 */
1402static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1403{
1404 struct serial_state *info = tty->driver_data;
1405 unsigned long orig_jiffies, char_time;
1406 int lsr;
1407
1408 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1409 return;
1410
1411 if (info->xmit_fifo_size == 0)
1412 return; /* Just in case.... */
1413
1414 orig_jiffies = jiffies;
1415
1416 /*
1417 * Set the check interval to be 1/5 of the estimated time to
1418 * send a single character, and make it at least 1. The check
1419 * interval should also be less than the timeout.
1420 *
1421 * Note: we have to use pretty tight timings here to satisfy
1422 * the NIST-PCTS.
1423 */
1424 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1425 char_time = char_time / 5;
1426 if (char_time == 0)
1427 char_time = 1;
1428 if (timeout)
1429 char_time = min_t(unsigned long, char_time, timeout);
1430 /*
1431 * If the transmitter hasn't cleared in twice the approximate
1432 * amount of time to send the entire FIFO, it probably won't
1433 * ever clear. This assumes the UART isn't doing flow
1434 * control, which is currently the case. Hence, if it ever
1435 * takes longer than info->timeout, this is probably due to a
1436 * UART bug of some kind. So, we clamp the timeout parameter at
1437 * 2*info->timeout.
1438 */
1439 if (!timeout || timeout > 2*info->timeout)
1440 timeout = 2*info->timeout;
1441#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1442 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1443 printk("jiff=%lu...", jiffies);
1444#endif
1445 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1446#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1447 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1448#endif
1449 msleep_interruptible(jiffies_to_msecs(char_time));
1450 if (signal_pending(current))
1451 break;
1452 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1453 break;
1454 }
1455 __set_current_state(TASK_RUNNING);
1456
1457#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1458 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1459#endif
1460}
1461
1462/*
1463 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1464 */
1465static void rs_hangup(struct tty_struct *tty)
1466{
1467 struct serial_state *info = tty->driver_data;
1468
1469 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1470 return;
1471
1472 rs_flush_buffer(tty);
1473 shutdown(tty, info);
1474 info->tport.count = 0;
1475 tty_port_set_active(&info->tport, 0);
1476 info->tport.tty = NULL;
1477 wake_up_interruptible(&info->tport.open_wait);
1478}
1479
1480/*
1481 * This routine is called whenever a serial port is opened. It
1482 * enables interrupts for a serial port, linking in its async structure into
1483 * the IRQ chain. It also performs the serial-specific
1484 * initialization for the tty structure.
1485 */
1486static int rs_open(struct tty_struct *tty, struct file * filp)
1487{
1488 struct serial_state *info = rs_table + tty->index;
1489 struct tty_port *port = &info->tport;
1490 int retval;
1491
1492 port->count++;
1493 port->tty = tty;
1494 tty->driver_data = info;
1495 tty->port = port;
1496 if (serial_paranoia_check(info, tty->name, "rs_open"))
1497 return -ENODEV;
1498
1499 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1500
1501 retval = startup(tty, info);
1502 if (retval) {
1503 return retval;
1504 }
1505
1506 return tty_port_block_til_ready(port, tty, filp);
1507}
1508
1509/*
1510 * /proc fs routines....
1511 */
1512
1513static inline void line_info(struct seq_file *m, int line,
1514 struct serial_state *state)
1515{
1516 char stat_buf[30], control, status;
1517 unsigned long flags;
1518
1519 seq_printf(m, "%d: uart:amiga_builtin", line);
1520
1521 local_irq_save(flags);
1522 status = ciab.pra;
1523 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1524 local_irq_restore(flags);
1525
1526 stat_buf[0] = 0;
1527 stat_buf[1] = 0;
1528 if(!(control & SER_RTS))
1529 strcat(stat_buf, "|RTS");
1530 if(!(status & SER_CTS))
1531 strcat(stat_buf, "|CTS");
1532 if(!(control & SER_DTR))
1533 strcat(stat_buf, "|DTR");
1534 if(!(status & SER_DSR))
1535 strcat(stat_buf, "|DSR");
1536 if(!(status & SER_DCD))
1537 strcat(stat_buf, "|CD");
1538
1539 if (state->quot)
1540 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1541
1542 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1543
1544 if (state->icount.frame)
1545 seq_printf(m, " fe:%d", state->icount.frame);
1546
1547 if (state->icount.parity)
1548 seq_printf(m, " pe:%d", state->icount.parity);
1549
1550 if (state->icount.brk)
1551 seq_printf(m, " brk:%d", state->icount.brk);
1552
1553 if (state->icount.overrun)
1554 seq_printf(m, " oe:%d", state->icount.overrun);
1555
1556 /*
1557 * Last thing is the RS-232 status lines
1558 */
1559 seq_printf(m, " %s\n", stat_buf+1);
1560}
1561
1562static int rs_proc_show(struct seq_file *m, void *v)
1563{
1564 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1565 line_info(m, 0, &rs_table[0]);
1566 return 0;
1567}
1568
1569static int rs_proc_open(struct inode *inode, struct file *file)
1570{
1571 return single_open(file, rs_proc_show, NULL);
1572}
1573
1574static const struct file_operations rs_proc_fops = {
1575 .owner = THIS_MODULE,
1576 .open = rs_proc_open,
1577 .read = seq_read,
1578 .llseek = seq_lseek,
1579 .release = single_release,
1580};
1581
1582/*
1583 * ---------------------------------------------------------------------
1584 * rs_init() and friends
1585 *
1586 * rs_init() is called at boot-time to initialize the serial driver.
1587 * ---------------------------------------------------------------------
1588 */
1589
1590/*
1591 * This routine prints out the appropriate serial driver version
1592 * number, and identifies which options were configured into this
1593 * driver.
1594 */
1595static void show_serial_version(void)
1596{
1597 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1598}
1599
1600
1601static const struct tty_operations serial_ops = {
1602 .open = rs_open,
1603 .close = rs_close,
1604 .write = rs_write,
1605 .put_char = rs_put_char,
1606 .flush_chars = rs_flush_chars,
1607 .write_room = rs_write_room,
1608 .chars_in_buffer = rs_chars_in_buffer,
1609 .flush_buffer = rs_flush_buffer,
1610 .ioctl = rs_ioctl,
1611 .throttle = rs_throttle,
1612 .unthrottle = rs_unthrottle,
1613 .set_termios = rs_set_termios,
1614 .stop = rs_stop,
1615 .start = rs_start,
1616 .hangup = rs_hangup,
1617 .break_ctl = rs_break,
1618 .send_xchar = rs_send_xchar,
1619 .wait_until_sent = rs_wait_until_sent,
1620 .tiocmget = rs_tiocmget,
1621 .tiocmset = rs_tiocmset,
1622 .get_icount = rs_get_icount,
1623 .proc_fops = &rs_proc_fops,
1624};
1625
1626static int amiga_carrier_raised(struct tty_port *port)
1627{
1628 return !(ciab.pra & SER_DCD);
1629}
1630
1631static void amiga_dtr_rts(struct tty_port *port, int raise)
1632{
1633 struct serial_state *info = container_of(port, struct serial_state,
1634 tport);
1635 unsigned long flags;
1636
1637 if (raise)
1638 info->MCR |= SER_DTR|SER_RTS;
1639 else
1640 info->MCR &= ~(SER_DTR|SER_RTS);
1641
1642 local_irq_save(flags);
1643 rtsdtr_ctrl(info->MCR);
1644 local_irq_restore(flags);
1645}
1646
1647static const struct tty_port_operations amiga_port_ops = {
1648 .carrier_raised = amiga_carrier_raised,
1649 .dtr_rts = amiga_dtr_rts,
1650};
1651
1652/*
1653 * The serial driver boot-time initialization code!
1654 */
1655static int __init amiga_serial_probe(struct platform_device *pdev)
1656{
1657 unsigned long flags;
1658 struct serial_state * state;
1659 int error;
1660
1661 serial_driver = alloc_tty_driver(NR_PORTS);
1662 if (!serial_driver)
1663 return -ENOMEM;
1664
1665 show_serial_version();
1666
1667 /* Initialize the tty_driver structure */
1668
1669 serial_driver->driver_name = "amiserial";
1670 serial_driver->name = "ttyS";
1671 serial_driver->major = TTY_MAJOR;
1672 serial_driver->minor_start = 64;
1673 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1674 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1675 serial_driver->init_termios = tty_std_termios;
1676 serial_driver->init_termios.c_cflag =
1677 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1678 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1679 tty_set_operations(serial_driver, &serial_ops);
1680
1681 state = rs_table;
1682 state->port = (int)&custom.serdatr; /* Just to give it a value */
1683 state->custom_divisor = 0;
1684 state->icount.cts = state->icount.dsr =
1685 state->icount.rng = state->icount.dcd = 0;
1686 state->icount.rx = state->icount.tx = 0;
1687 state->icount.frame = state->icount.parity = 0;
1688 state->icount.overrun = state->icount.brk = 0;
1689 tty_port_init(&state->tport);
1690 state->tport.ops = &amiga_port_ops;
1691 tty_port_link_device(&state->tport, serial_driver, 0);
1692
1693 error = tty_register_driver(serial_driver);
1694 if (error)
1695 goto fail_put_tty_driver;
1696
1697 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1698
1699 /* Hardware set up */
1700
1701 state->baud_base = amiga_colorclock;
1702 state->xmit_fifo_size = 1;
1703
1704 /* set ISRs, and then disable the rx interrupts */
1705 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1706 if (error)
1707 goto fail_unregister;
1708
1709 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1710 "serial RX", state);
1711 if (error)
1712 goto fail_free_irq;
1713
1714 local_irq_save(flags);
1715
1716 /* turn off Rx and Tx interrupts */
1717 custom.intena = IF_RBF | IF_TBE;
1718 mb();
1719
1720 /* clear any pending interrupt */
1721 custom.intreq = IF_RBF | IF_TBE;
1722 mb();
1723
1724 local_irq_restore(flags);
1725
1726 /*
1727 * set the appropriate directions for the modem control flags,
1728 * and clear RTS and DTR
1729 */
1730 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1731 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1732
1733 platform_set_drvdata(pdev, state);
1734
1735 return 0;
1736
1737fail_free_irq:
1738 free_irq(IRQ_AMIGA_TBE, state);
1739fail_unregister:
1740 tty_unregister_driver(serial_driver);
1741fail_put_tty_driver:
1742 tty_port_destroy(&state->tport);
1743 put_tty_driver(serial_driver);
1744 return error;
1745}
1746
1747static int __exit amiga_serial_remove(struct platform_device *pdev)
1748{
1749 int error;
1750 struct serial_state *state = platform_get_drvdata(pdev);
1751
1752 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1753 error = tty_unregister_driver(serial_driver);
1754 if (error)
1755 printk("SERIAL: failed to unregister serial driver (%d)\n",
1756 error);
1757 put_tty_driver(serial_driver);
1758 tty_port_destroy(&state->tport);
1759
1760 free_irq(IRQ_AMIGA_TBE, state);
1761 free_irq(IRQ_AMIGA_RBF, state);
1762
1763 return error;
1764}
1765
1766static struct platform_driver amiga_serial_driver = {
1767 .remove = __exit_p(amiga_serial_remove),
1768 .driver = {
1769 .name = "amiga-serial",
1770 },
1771};
1772
1773module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1774
1775
1776#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1777
1778/*
1779 * ------------------------------------------------------------
1780 * Serial console driver
1781 * ------------------------------------------------------------
1782 */
1783
1784static void amiga_serial_putc(char c)
1785{
1786 custom.serdat = (unsigned char)c | 0x100;
1787 while (!(custom.serdatr & 0x2000))
1788 barrier();
1789}
1790
1791/*
1792 * Print a string to the serial port trying not to disturb
1793 * any possible real use of the port...
1794 *
1795 * The console must be locked when we get here.
1796 */
1797static void serial_console_write(struct console *co, const char *s,
1798 unsigned count)
1799{
1800 unsigned short intena = custom.intenar;
1801
1802 custom.intena = IF_TBE;
1803
1804 while (count--) {
1805 if (*s == '\n')
1806 amiga_serial_putc('\r');
1807 amiga_serial_putc(*s++);
1808 }
1809
1810 custom.intena = IF_SETCLR | (intena & IF_TBE);
1811}
1812
1813static struct tty_driver *serial_console_device(struct console *c, int *index)
1814{
1815 *index = 0;
1816 return serial_driver;
1817}
1818
1819static struct console sercons = {
1820 .name = "ttyS",
1821 .write = serial_console_write,
1822 .device = serial_console_device,
1823 .flags = CON_PRINTBUFFER,
1824 .index = -1,
1825};
1826
1827/*
1828 * Register console.
1829 */
1830static int __init amiserial_console_init(void)
1831{
1832 if (!MACH_IS_AMIGA)
1833 return -ENODEV;
1834
1835 register_console(&sercons);
1836 return 0;
1837}
1838console_initcall(amiserial_console_init);
1839
1840#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1841
1842MODULE_LICENSE("GPL");
1843MODULE_ALIAS("platform:amiga-serial");