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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Serial driver for the amiga builtin port.
4 *
5 * This code was created by taking serial.c version 4.30 from kernel
6 * release 2.3.22, replacing all hardware related stuff with the
7 * corresponding amiga hardware actions, and removing all irrelevant
8 * code. As a consequence, it uses many of the constants and names
9 * associated with the registers and bits of 16550 compatible UARTS -
10 * but only to keep track of status, etc in the state variables. It
11 * was done this was to make it easier to keep the code in line with
12 * (non hardware specific) changes to serial.c.
13 *
14 * The port is registered with the tty driver as minor device 64, and
15 * therefore other ports should only use 65 upwards.
16 *
17 * Richard Lucock 28/12/99
18 *
19 * Copyright (C) 1991, 1992 Linus Torvalds
20 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
21 * 1998, 1999 Theodore Ts'o
22 *
23 */
24
25/* Set of debugging defines */
26
27#undef SERIAL_DEBUG_INTR
28#undef SERIAL_DEBUG_OPEN
29#undef SERIAL_DEBUG_FLOW
30#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
31
32/*
33 * End of serial driver configuration section.
34 */
35
36#include <linux/bitops.h>
37#include <linux/circ_buf.h>
38#include <linux/console.h>
39#include <linux/delay.h>
40#include <linux/errno.h>
41#include <linux/fcntl.h>
42#include <linux/init.h>
43#include <linux/interrupt.h>
44#include <linux/ioport.h>
45#include <linux/kernel.h>
46#include <linux/major.h>
47#include <linux/mm.h>
48#include <linux/module.h>
49#include <linux/platform_device.h>
50#include <linux/ptrace.h>
51#include <linux/seq_file.h>
52#include <linux/serial.h>
53#include <linux/serial_reg.h>
54#include <linux/serial_core.h>
55#include <linux/sched.h>
56#include <linux/signal.h>
57#include <linux/slab.h>
58#include <linux/string.h>
59#include <linux/timer.h>
60#include <linux/tty_flip.h>
61#include <linux/tty.h>
62#include <linux/types.h>
63#include <linux/uaccess.h>
64
65#include <asm/amigahw.h>
66#include <asm/amigaints.h>
67#include <asm/irq.h>
68#include <asm/setup.h>
69
70struct serial_state {
71 struct tty_port tport;
72 struct circ_buf xmit;
73 struct async_icount icount;
74
75 unsigned long port;
76 int baud_base;
77 int custom_divisor;
78 int read_status_mask;
79 int ignore_status_mask;
80 int timeout;
81 int quot;
82 int IER; /* Interrupt Enable Register */
83 int MCR; /* Modem control register */
84 u8 x_char; /* xon/xoff character */
85};
86
87static struct tty_driver *serial_driver;
88
89/* number of characters left in xmit buffer before we ask for more */
90#define WAKEUP_CHARS 256
91
92#define XMIT_FIFO_SIZE 1
93
94static unsigned char current_ctl_bits;
95
96static void change_speed(struct tty_struct *tty, struct serial_state *info,
97 const struct ktermios *old);
98static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
99
100
101static struct serial_state serial_state;
102
103/* some serial hardware definitions */
104#define SDR_OVRUN (1<<15)
105#define SDR_RBF (1<<14)
106#define SDR_TBE (1<<13)
107#define SDR_TSRE (1<<12)
108
109#define SERPER_PARENB (1<<15)
110
111#define AC_SETCLR (1<<15)
112#define AC_UARTBRK (1<<11)
113
114#define SER_DTR (1<<7)
115#define SER_RTS (1<<6)
116#define SER_DCD (1<<5)
117#define SER_CTS (1<<4)
118#define SER_DSR (1<<3)
119
120static __inline__ void rtsdtr_ctrl(int bits)
121{
122 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
123}
124
125/*
126 * ------------------------------------------------------------
127 * rs_stop() and rs_start()
128 *
129 * This routines are called before setting or resetting tty->flow.stopped.
130 * They enable or disable transmitter interrupts, as necessary.
131 * ------------------------------------------------------------
132 */
133static void rs_stop(struct tty_struct *tty)
134{
135 struct serial_state *info = tty->driver_data;
136 unsigned long flags;
137
138 local_irq_save(flags);
139 if (info->IER & UART_IER_THRI) {
140 info->IER &= ~UART_IER_THRI;
141 /* disable Tx interrupt and remove any pending interrupts */
142 amiga_custom.intena = IF_TBE;
143 mb();
144 amiga_custom.intreq = IF_TBE;
145 mb();
146 }
147 local_irq_restore(flags);
148}
149
150static void rs_start(struct tty_struct *tty)
151{
152 struct serial_state *info = tty->driver_data;
153 unsigned long flags;
154
155 local_irq_save(flags);
156 if (info->xmit.head != info->xmit.tail
157 && info->xmit.buf
158 && !(info->IER & UART_IER_THRI)) {
159 info->IER |= UART_IER_THRI;
160 amiga_custom.intena = IF_SETCLR | IF_TBE;
161 mb();
162 /* set a pending Tx Interrupt, transmitter should restart now */
163 amiga_custom.intreq = IF_SETCLR | IF_TBE;
164 mb();
165 }
166 local_irq_restore(flags);
167}
168
169/*
170 * ----------------------------------------------------------------------
171 *
172 * Here start the interrupt handling routines.
173 *
174 * -----------------------------------------------------------------------
175 */
176
177static void receive_chars(struct serial_state *info)
178{
179 int status;
180 int serdatr;
181 u8 ch, flag;
182 struct async_icount *icount;
183 bool overrun = false;
184
185 icount = &info->icount;
186
187 status = UART_LSR_DR; /* We obviously have a character! */
188 serdatr = amiga_custom.serdatr;
189 mb();
190 amiga_custom.intreq = IF_RBF;
191 mb();
192
193 if((serdatr & 0x1ff) == 0)
194 status |= UART_LSR_BI;
195 if(serdatr & SDR_OVRUN)
196 status |= UART_LSR_OE;
197
198 ch = serdatr & 0xff;
199 icount->rx++;
200
201#ifdef SERIAL_DEBUG_INTR
202 printk("DR%02x:%02x...", ch, status);
203#endif
204 flag = TTY_NORMAL;
205
206 /*
207 * We don't handle parity or frame errors - but I have left
208 * the code in, since I'm not sure that the errors can't be
209 * detected.
210 */
211
212 if (status & (UART_LSR_BI | UART_LSR_PE |
213 UART_LSR_FE | UART_LSR_OE)) {
214 /*
215 * For statistics only
216 */
217 if (status & UART_LSR_BI) {
218 status &= ~(UART_LSR_FE | UART_LSR_PE);
219 icount->brk++;
220 } else if (status & UART_LSR_PE)
221 icount->parity++;
222 else if (status & UART_LSR_FE)
223 icount->frame++;
224 if (status & UART_LSR_OE)
225 icount->overrun++;
226
227 /*
228 * Now check to see if character should be
229 * ignored, and mask off conditions which
230 * should be ignored.
231 */
232 if (status & info->ignore_status_mask)
233 return;
234
235 status &= info->read_status_mask;
236
237 if (status & (UART_LSR_BI)) {
238#ifdef SERIAL_DEBUG_INTR
239 printk("handling break....");
240#endif
241 flag = TTY_BREAK;
242 if (info->tport.flags & ASYNC_SAK)
243 do_SAK(info->tport.tty);
244 } else if (status & UART_LSR_PE)
245 flag = TTY_PARITY;
246 else if (status & UART_LSR_FE)
247 flag = TTY_FRAME;
248 if (status & UART_LSR_OE) {
249 /*
250 * Overrun is special, since it's
251 * reported immediately, and doesn't
252 * affect the current character
253 */
254 overrun = true;
255 }
256 }
257 tty_insert_flip_char(&info->tport, ch, flag);
258 if (overrun)
259 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
260 tty_flip_buffer_push(&info->tport);
261}
262
263static void transmit_chars(struct serial_state *info)
264{
265 amiga_custom.intreq = IF_TBE;
266 mb();
267 if (info->x_char) {
268 amiga_custom.serdat = info->x_char | 0x100;
269 mb();
270 info->icount.tx++;
271 info->x_char = 0;
272 return;
273 }
274 if (info->xmit.head == info->xmit.tail
275 || info->tport.tty->flow.stopped
276 || info->tport.tty->hw_stopped) {
277 info->IER &= ~UART_IER_THRI;
278 amiga_custom.intena = IF_TBE;
279 mb();
280 return;
281 }
282
283 amiga_custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
284 mb();
285 info->xmit.tail = info->xmit.tail & (UART_XMIT_SIZE - 1);
286 info->icount.tx++;
287
288 if (CIRC_CNT(info->xmit.head,
289 info->xmit.tail,
290 UART_XMIT_SIZE) < WAKEUP_CHARS)
291 tty_wakeup(info->tport.tty);
292
293#ifdef SERIAL_DEBUG_INTR
294 printk("THRE...");
295#endif
296 if (info->xmit.head == info->xmit.tail) {
297 amiga_custom.intena = IF_TBE;
298 mb();
299 info->IER &= ~UART_IER_THRI;
300 }
301}
302
303static void check_modem_status(struct serial_state *info)
304{
305 struct tty_port *port = &info->tport;
306 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
307 unsigned char dstatus;
308 struct async_icount *icount;
309
310 /* Determine bits that have changed */
311 dstatus = status ^ current_ctl_bits;
312 current_ctl_bits = status;
313
314 if (dstatus) {
315 icount = &info->icount;
316 /* update input line counters */
317 if (dstatus & SER_DSR)
318 icount->dsr++;
319 if (dstatus & SER_DCD) {
320 icount->dcd++;
321 }
322 if (dstatus & SER_CTS)
323 icount->cts++;
324 wake_up_interruptible(&port->delta_msr_wait);
325 }
326
327 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
328#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
329 printk("ttyS%d CD now %s...", info->line,
330 (!(status & SER_DCD)) ? "on" : "off");
331#endif
332 if (!(status & SER_DCD))
333 wake_up_interruptible(&port->open_wait);
334 else {
335#ifdef SERIAL_DEBUG_OPEN
336 printk("doing serial hangup...");
337#endif
338 if (port->tty)
339 tty_hangup(port->tty);
340 }
341 }
342 if (tty_port_cts_enabled(port)) {
343 if (port->tty->hw_stopped) {
344 if (!(status & SER_CTS)) {
345#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
346 printk("CTS tx start...");
347#endif
348 port->tty->hw_stopped = false;
349 info->IER |= UART_IER_THRI;
350 amiga_custom.intena = IF_SETCLR | IF_TBE;
351 mb();
352 /* set a pending Tx Interrupt, transmitter should restart now */
353 amiga_custom.intreq = IF_SETCLR | IF_TBE;
354 mb();
355 tty_wakeup(port->tty);
356 return;
357 }
358 } else {
359 if ((status & SER_CTS)) {
360#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
361 printk("CTS tx stop...");
362#endif
363 port->tty->hw_stopped = true;
364 info->IER &= ~UART_IER_THRI;
365 /* disable Tx interrupt and remove any pending interrupts */
366 amiga_custom.intena = IF_TBE;
367 mb();
368 amiga_custom.intreq = IF_TBE;
369 mb();
370 }
371 }
372 }
373}
374
375static irqreturn_t ser_vbl_int( int irq, void *data)
376{
377 /* vbl is just a periodic interrupt we tie into to update modem status */
378 struct serial_state *info = data;
379 /*
380 * TBD - is it better to unregister from this interrupt or to
381 * ignore it if MSI is clear ?
382 */
383 if(info->IER & UART_IER_MSI)
384 check_modem_status(info);
385 return IRQ_HANDLED;
386}
387
388static irqreturn_t ser_rx_int(int irq, void *dev_id)
389{
390 struct serial_state *info = dev_id;
391
392#ifdef SERIAL_DEBUG_INTR
393 printk("ser_rx_int...");
394#endif
395
396 if (!info->tport.tty)
397 return IRQ_NONE;
398
399 receive_chars(info);
400#ifdef SERIAL_DEBUG_INTR
401 printk("end.\n");
402#endif
403 return IRQ_HANDLED;
404}
405
406static irqreturn_t ser_tx_int(int irq, void *dev_id)
407{
408 struct serial_state *info = dev_id;
409
410 if (amiga_custom.serdatr & SDR_TBE) {
411#ifdef SERIAL_DEBUG_INTR
412 printk("ser_tx_int...");
413#endif
414
415 if (!info->tport.tty)
416 return IRQ_NONE;
417
418 transmit_chars(info);
419#ifdef SERIAL_DEBUG_INTR
420 printk("end.\n");
421#endif
422 }
423 return IRQ_HANDLED;
424}
425
426/*
427 * -------------------------------------------------------------------
428 * Here ends the serial interrupt routines.
429 * -------------------------------------------------------------------
430 */
431
432/*
433 * ---------------------------------------------------------------
434 * Low level utility subroutines for the serial driver: routines to
435 * figure out the appropriate timeout for an interrupt chain, routines
436 * to initialize and startup a serial port, and routines to shutdown a
437 * serial port. Useful stuff like that.
438 * ---------------------------------------------------------------
439 */
440
441static int startup(struct tty_struct *tty, struct serial_state *info)
442{
443 struct tty_port *port = &info->tport;
444 unsigned long flags;
445 int retval=0;
446 unsigned long page;
447
448 page = get_zeroed_page(GFP_KERNEL);
449 if (!page)
450 return -ENOMEM;
451
452 local_irq_save(flags);
453
454 if (tty_port_initialized(port)) {
455 free_page(page);
456 goto errout;
457 }
458
459 if (info->xmit.buf)
460 free_page(page);
461 else
462 info->xmit.buf = (unsigned char *) page;
463
464#ifdef SERIAL_DEBUG_OPEN
465 printk("starting up ttys%d ...", info->line);
466#endif
467
468 /* Clear anything in the input buffer */
469
470 amiga_custom.intreq = IF_RBF;
471 mb();
472
473 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
474 if (retval) {
475 if (capable(CAP_SYS_ADMIN)) {
476 set_bit(TTY_IO_ERROR, &tty->flags);
477 retval = 0;
478 }
479 goto errout;
480 }
481
482 /* enable both Rx and Tx interrupts */
483 amiga_custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
484 mb();
485 info->IER = UART_IER_MSI;
486
487 /* remember current state of the DCD and CTS bits */
488 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
489
490 info->MCR = 0;
491 if (C_BAUD(tty))
492 info->MCR = SER_DTR | SER_RTS;
493 rtsdtr_ctrl(info->MCR);
494
495 clear_bit(TTY_IO_ERROR, &tty->flags);
496 info->xmit.head = info->xmit.tail = 0;
497
498 /*
499 * and set the speed of the serial port
500 */
501 change_speed(tty, info, NULL);
502
503 tty_port_set_initialized(port, true);
504 local_irq_restore(flags);
505 return 0;
506
507errout:
508 local_irq_restore(flags);
509 return retval;
510}
511
512/*
513 * This routine will shutdown a serial port; interrupts are disabled, and
514 * DTR is dropped if the hangup on close termio flag is on.
515 */
516static void shutdown(struct tty_struct *tty, struct serial_state *info)
517{
518 unsigned long flags;
519
520 if (!tty_port_initialized(&info->tport))
521 return;
522
523#ifdef SERIAL_DEBUG_OPEN
524 printk("Shutting down serial port %d ....\n", info->line);
525#endif
526
527 local_irq_save(flags); /* Disable interrupts */
528
529 /*
530 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
531 * here so the queue might never be waken up
532 */
533 wake_up_interruptible(&info->tport.delta_msr_wait);
534
535 /*
536 * Free the IRQ, if necessary
537 */
538 free_irq(IRQ_AMIGA_VERTB, info);
539
540 free_page((unsigned long)info->xmit.buf);
541 info->xmit.buf = NULL;
542
543 info->IER = 0;
544 amiga_custom.intena = IF_RBF | IF_TBE;
545 mb();
546
547 /* disable break condition */
548 amiga_custom.adkcon = AC_UARTBRK;
549 mb();
550
551 if (C_HUPCL(tty))
552 info->MCR &= ~(SER_DTR|SER_RTS);
553 rtsdtr_ctrl(info->MCR);
554
555 set_bit(TTY_IO_ERROR, &tty->flags);
556
557 tty_port_set_initialized(&info->tport, false);
558 local_irq_restore(flags);
559}
560
561
562/*
563 * This routine is called to set the UART divisor registers to match
564 * the specified baud rate for a serial port.
565 */
566static void change_speed(struct tty_struct *tty, struct serial_state *info,
567 const struct ktermios *old_termios)
568{
569 struct tty_port *port = &info->tport;
570 int quot = 0, baud_base, baud;
571 unsigned cflag, cval = 0;
572 int bits;
573 unsigned long flags;
574
575 cflag = tty->termios.c_cflag;
576
577 /* Byte size is always 8 bits plus parity bit if requested */
578
579 cval = 3; bits = 10;
580 if (cflag & CSTOPB) {
581 cval |= 0x04;
582 bits++;
583 }
584 if (cflag & PARENB) {
585 cval |= UART_LCR_PARITY;
586 bits++;
587 }
588 if (!(cflag & PARODD))
589 cval |= UART_LCR_EPAR;
590 if (cflag & CMSPAR)
591 cval |= UART_LCR_SPAR;
592
593 /* Determine divisor based on baud rate */
594 baud = tty_get_baud_rate(tty);
595 if (!baud)
596 baud = 9600; /* B0 transition handled in rs_set_termios */
597 baud_base = info->baud_base;
598 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
599 quot = info->custom_divisor;
600 else {
601 if (baud == 134)
602 /* Special case since 134 is really 134.5 */
603 quot = (2*baud_base / 269);
604 else if (baud)
605 quot = baud_base / baud;
606 }
607 /* If the quotient is zero refuse the change */
608 if (!quot && old_termios) {
609 /* FIXME: Will need updating for new tty in the end */
610 tty->termios.c_cflag &= ~CBAUD;
611 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
612 baud = tty_get_baud_rate(tty);
613 if (!baud)
614 baud = 9600;
615 if (baud == 38400 &&
616 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
617 quot = info->custom_divisor;
618 else {
619 if (baud == 134)
620 /* Special case since 134 is really 134.5 */
621 quot = (2*baud_base / 269);
622 else if (baud)
623 quot = baud_base / baud;
624 }
625 }
626 /* As a last resort, if the quotient is zero, default to 9600 bps */
627 if (!quot)
628 quot = baud_base / 9600;
629 info->quot = quot;
630 info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base;
631 info->timeout += HZ/50; /* Add .02 seconds of slop */
632
633 /* CTS flow control flag and modem status interrupts */
634 info->IER &= ~UART_IER_MSI;
635 if (port->flags & ASYNC_HARDPPS_CD)
636 info->IER |= UART_IER_MSI;
637 tty_port_set_cts_flow(port, cflag & CRTSCTS);
638 if (cflag & CRTSCTS)
639 info->IER |= UART_IER_MSI;
640 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
641 if (~cflag & CLOCAL)
642 info->IER |= UART_IER_MSI;
643 /* TBD:
644 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
645 */
646
647 /*
648 * Set up parity check flag
649 */
650
651 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
652 if (I_INPCK(tty))
653 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
654 if (I_BRKINT(tty) || I_PARMRK(tty))
655 info->read_status_mask |= UART_LSR_BI;
656
657 /*
658 * Characters to ignore
659 */
660 info->ignore_status_mask = 0;
661 if (I_IGNPAR(tty))
662 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
663 if (I_IGNBRK(tty)) {
664 info->ignore_status_mask |= UART_LSR_BI;
665 /*
666 * If we're ignore parity and break indicators, ignore
667 * overruns too. (For real raw support).
668 */
669 if (I_IGNPAR(tty))
670 info->ignore_status_mask |= UART_LSR_OE;
671 }
672 /*
673 * !!! ignore all characters if CREAD is not set
674 */
675 if ((cflag & CREAD) == 0)
676 info->ignore_status_mask |= UART_LSR_DR;
677 local_irq_save(flags);
678
679 {
680 short serper;
681
682 /* Set up the baud rate */
683 serper = quot - 1;
684
685 /* Enable or disable parity bit */
686
687 if(cval & UART_LCR_PARITY)
688 serper |= (SERPER_PARENB);
689
690 amiga_custom.serper = serper;
691 mb();
692 }
693
694 local_irq_restore(flags);
695}
696
697static int rs_put_char(struct tty_struct *tty, u8 ch)
698{
699 struct serial_state *info;
700 unsigned long flags;
701
702 info = tty->driver_data;
703
704 if (!info->xmit.buf)
705 return 0;
706
707 local_irq_save(flags);
708 if (CIRC_SPACE(info->xmit.head,
709 info->xmit.tail,
710 UART_XMIT_SIZE) == 0) {
711 local_irq_restore(flags);
712 return 0;
713 }
714
715 info->xmit.buf[info->xmit.head++] = ch;
716 info->xmit.head &= UART_XMIT_SIZE - 1;
717 local_irq_restore(flags);
718 return 1;
719}
720
721static void rs_flush_chars(struct tty_struct *tty)
722{
723 struct serial_state *info = tty->driver_data;
724 unsigned long flags;
725
726 if (info->xmit.head == info->xmit.tail
727 || tty->flow.stopped
728 || tty->hw_stopped
729 || !info->xmit.buf)
730 return;
731
732 local_irq_save(flags);
733 info->IER |= UART_IER_THRI;
734 amiga_custom.intena = IF_SETCLR | IF_TBE;
735 mb();
736 /* set a pending Tx Interrupt, transmitter should restart now */
737 amiga_custom.intreq = IF_SETCLR | IF_TBE;
738 mb();
739 local_irq_restore(flags);
740}
741
742static ssize_t rs_write(struct tty_struct * tty, const u8 *buf, size_t count)
743{
744 int c, ret = 0;
745 struct serial_state *info = tty->driver_data;
746 unsigned long flags;
747
748 if (!info->xmit.buf)
749 return 0;
750
751 local_irq_save(flags);
752 while (1) {
753 c = CIRC_SPACE_TO_END(info->xmit.head,
754 info->xmit.tail,
755 UART_XMIT_SIZE);
756 if (count < c)
757 c = count;
758 if (c <= 0) {
759 break;
760 }
761 memcpy(info->xmit.buf + info->xmit.head, buf, c);
762 info->xmit.head = (info->xmit.head + c) & (UART_XMIT_SIZE - 1);
763 buf += c;
764 count -= c;
765 ret += c;
766 }
767 local_irq_restore(flags);
768
769 if (info->xmit.head != info->xmit.tail
770 && !tty->flow.stopped
771 && !tty->hw_stopped
772 && !(info->IER & UART_IER_THRI)) {
773 info->IER |= UART_IER_THRI;
774 local_irq_disable();
775 amiga_custom.intena = IF_SETCLR | IF_TBE;
776 mb();
777 /* set a pending Tx Interrupt, transmitter should restart now */
778 amiga_custom.intreq = IF_SETCLR | IF_TBE;
779 mb();
780 local_irq_restore(flags);
781 }
782 return ret;
783}
784
785static unsigned int rs_write_room(struct tty_struct *tty)
786{
787 struct serial_state *info = tty->driver_data;
788
789 return CIRC_SPACE(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
790}
791
792static unsigned int rs_chars_in_buffer(struct tty_struct *tty)
793{
794 struct serial_state *info = tty->driver_data;
795
796 return CIRC_CNT(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
797}
798
799static void rs_flush_buffer(struct tty_struct *tty)
800{
801 struct serial_state *info = tty->driver_data;
802 unsigned long flags;
803
804 local_irq_save(flags);
805 info->xmit.head = info->xmit.tail = 0;
806 local_irq_restore(flags);
807 tty_wakeup(tty);
808}
809
810/*
811 * This function is used to send a high-priority XON/XOFF character to
812 * the device
813 */
814static void rs_send_xchar(struct tty_struct *tty, u8 ch)
815{
816 struct serial_state *info = tty->driver_data;
817 unsigned long flags;
818
819 info->x_char = ch;
820 if (ch) {
821 /* Make sure transmit interrupts are on */
822
823 /* Check this ! */
824 local_irq_save(flags);
825 if(!(amiga_custom.intenar & IF_TBE)) {
826 amiga_custom.intena = IF_SETCLR | IF_TBE;
827 mb();
828 /* set a pending Tx Interrupt, transmitter should restart now */
829 amiga_custom.intreq = IF_SETCLR | IF_TBE;
830 mb();
831 }
832 local_irq_restore(flags);
833
834 info->IER |= UART_IER_THRI;
835 }
836}
837
838/*
839 * ------------------------------------------------------------
840 * rs_throttle()
841 *
842 * This routine is called by the upper-layer tty layer to signal that
843 * incoming characters should be throttled.
844 * ------------------------------------------------------------
845 */
846static void rs_throttle(struct tty_struct * tty)
847{
848 struct serial_state *info = tty->driver_data;
849 unsigned long flags;
850#ifdef SERIAL_DEBUG_THROTTLE
851 printk("throttle %s ....\n", tty_name(tty));
852#endif
853
854 if (I_IXOFF(tty))
855 rs_send_xchar(tty, STOP_CHAR(tty));
856
857 if (C_CRTSCTS(tty))
858 info->MCR &= ~SER_RTS;
859
860 local_irq_save(flags);
861 rtsdtr_ctrl(info->MCR);
862 local_irq_restore(flags);
863}
864
865static void rs_unthrottle(struct tty_struct * tty)
866{
867 struct serial_state *info = tty->driver_data;
868 unsigned long flags;
869#ifdef SERIAL_DEBUG_THROTTLE
870 printk("unthrottle %s ....\n", tty_name(tty));
871#endif
872
873 if (I_IXOFF(tty)) {
874 if (info->x_char)
875 info->x_char = 0;
876 else
877 rs_send_xchar(tty, START_CHAR(tty));
878 }
879 if (C_CRTSCTS(tty))
880 info->MCR |= SER_RTS;
881 local_irq_save(flags);
882 rtsdtr_ctrl(info->MCR);
883 local_irq_restore(flags);
884}
885
886/*
887 * ------------------------------------------------------------
888 * rs_ioctl() and friends
889 * ------------------------------------------------------------
890 */
891
892static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
893{
894 struct serial_state *state = tty->driver_data;
895 unsigned int close_delay, closing_wait;
896
897 tty_lock(tty);
898 close_delay = jiffies_to_msecs(state->tport.close_delay) / 10;
899 closing_wait = state->tport.closing_wait;
900 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
901 closing_wait = jiffies_to_msecs(closing_wait) / 10;
902
903 ss->line = tty->index;
904 ss->port = state->port;
905 ss->flags = state->tport.flags;
906 ss->xmit_fifo_size = XMIT_FIFO_SIZE;
907 ss->baud_base = state->baud_base;
908 ss->close_delay = close_delay;
909 ss->closing_wait = closing_wait;
910 ss->custom_divisor = state->custom_divisor;
911 tty_unlock(tty);
912 return 0;
913}
914
915static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
916{
917 struct serial_state *state = tty->driver_data;
918 struct tty_port *port = &state->tport;
919 bool change_spd;
920 int retval = 0;
921 unsigned int close_delay, closing_wait;
922
923 tty_lock(tty);
924 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
925 ss->custom_divisor != state->custom_divisor;
926 if (ss->irq || ss->port != state->port ||
927 ss->xmit_fifo_size != XMIT_FIFO_SIZE) {
928 tty_unlock(tty);
929 return -EINVAL;
930 }
931
932 close_delay = msecs_to_jiffies(ss->close_delay * 10);
933 closing_wait = ss->closing_wait;
934 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
935 closing_wait = msecs_to_jiffies(closing_wait * 10);
936
937 if (!capable(CAP_SYS_ADMIN)) {
938 if ((ss->baud_base != state->baud_base) ||
939 (close_delay != port->close_delay) ||
940 (closing_wait != port->closing_wait) ||
941 ((ss->flags & ~ASYNC_USR_MASK) !=
942 (port->flags & ~ASYNC_USR_MASK))) {
943 tty_unlock(tty);
944 return -EPERM;
945 }
946 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
947 (ss->flags & ASYNC_USR_MASK));
948 state->custom_divisor = ss->custom_divisor;
949 goto check_and_exit;
950 }
951
952 if (ss->baud_base < 9600) {
953 tty_unlock(tty);
954 return -EINVAL;
955 }
956
957 /*
958 * OK, past this point, all the error checking has been done.
959 * At this point, we start making changes.....
960 */
961
962 state->baud_base = ss->baud_base;
963 port->flags = ((port->flags & ~ASYNC_FLAGS) |
964 (ss->flags & ASYNC_FLAGS));
965 state->custom_divisor = ss->custom_divisor;
966 port->close_delay = close_delay;
967 port->closing_wait = closing_wait;
968
969check_and_exit:
970 if (tty_port_initialized(port)) {
971 if (change_spd) {
972 /* warn about deprecation unless clearing */
973 if (ss->flags & ASYNC_SPD_MASK)
974 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
975 change_speed(tty, state, NULL);
976 }
977 } else
978 retval = startup(tty, state);
979 tty_unlock(tty);
980 return retval;
981}
982
983/*
984 * get_lsr_info - get line status register info
985 *
986 * Purpose: Let user call ioctl() to get info when the UART physically
987 * is emptied. On bus types like RS485, the transmitter must
988 * release the bus after transmitting. This must be done when
989 * the transmit shift register is empty, not be done when the
990 * transmit holding register is empty. This functionality
991 * allows an RS485 driver to be written in user space.
992 */
993static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
994{
995 unsigned char status;
996 unsigned int result;
997 unsigned long flags;
998
999 local_irq_save(flags);
1000 status = amiga_custom.serdatr;
1001 mb();
1002 local_irq_restore(flags);
1003 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1004 if (copy_to_user(value, &result, sizeof(int)))
1005 return -EFAULT;
1006 return 0;
1007}
1008
1009
1010static int rs_tiocmget(struct tty_struct *tty)
1011{
1012 struct serial_state *info = tty->driver_data;
1013 unsigned char control, status;
1014 unsigned long flags;
1015
1016 if (tty_io_error(tty))
1017 return -EIO;
1018
1019 control = info->MCR;
1020 local_irq_save(flags);
1021 status = ciab.pra;
1022 local_irq_restore(flags);
1023 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1024 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1025 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1026 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1027 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1028}
1029
1030static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1031 unsigned int clear)
1032{
1033 struct serial_state *info = tty->driver_data;
1034 unsigned long flags;
1035
1036 if (tty_io_error(tty))
1037 return -EIO;
1038
1039 local_irq_save(flags);
1040 if (set & TIOCM_RTS)
1041 info->MCR |= SER_RTS;
1042 if (set & TIOCM_DTR)
1043 info->MCR |= SER_DTR;
1044 if (clear & TIOCM_RTS)
1045 info->MCR &= ~SER_RTS;
1046 if (clear & TIOCM_DTR)
1047 info->MCR &= ~SER_DTR;
1048 rtsdtr_ctrl(info->MCR);
1049 local_irq_restore(flags);
1050 return 0;
1051}
1052
1053/*
1054 * rs_break() --- routine which turns the break handling on or off
1055 */
1056static int rs_break(struct tty_struct *tty, int break_state)
1057{
1058 unsigned long flags;
1059
1060 local_irq_save(flags);
1061 if (break_state == -1)
1062 amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK;
1063 else
1064 amiga_custom.adkcon = AC_UARTBRK;
1065 mb();
1066 local_irq_restore(flags);
1067 return 0;
1068}
1069
1070/*
1071 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1072 * Return: write counters to the user passed counter struct
1073 * NB: both 1->0 and 0->1 transitions are counted except for
1074 * RI where only 0->1 is counted.
1075 */
1076static int rs_get_icount(struct tty_struct *tty,
1077 struct serial_icounter_struct *icount)
1078{
1079 struct serial_state *info = tty->driver_data;
1080 struct async_icount cnow;
1081 unsigned long flags;
1082
1083 local_irq_save(flags);
1084 cnow = info->icount;
1085 local_irq_restore(flags);
1086 icount->cts = cnow.cts;
1087 icount->dsr = cnow.dsr;
1088 icount->rng = cnow.rng;
1089 icount->dcd = cnow.dcd;
1090 icount->rx = cnow.rx;
1091 icount->tx = cnow.tx;
1092 icount->frame = cnow.frame;
1093 icount->overrun = cnow.overrun;
1094 icount->parity = cnow.parity;
1095 icount->brk = cnow.brk;
1096 icount->buf_overrun = cnow.buf_overrun;
1097
1098 return 0;
1099}
1100
1101static int rs_ioctl(struct tty_struct *tty,
1102 unsigned int cmd, unsigned long arg)
1103{
1104 struct serial_state *info = tty->driver_data;
1105 struct async_icount cprev, cnow; /* kernel counter temps */
1106 void __user *argp = (void __user *)arg;
1107 unsigned long flags;
1108 DEFINE_WAIT(wait);
1109 int ret;
1110
1111 if ((cmd != TIOCSERCONFIG) &&
1112 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1113 if (tty_io_error(tty))
1114 return -EIO;
1115 }
1116
1117 switch (cmd) {
1118 case TIOCSERCONFIG:
1119 return 0;
1120
1121 case TIOCSERGETLSR: /* Get line status register */
1122 return get_lsr_info(info, argp);
1123
1124 /*
1125 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1126 * - mask passed in arg for lines of interest
1127 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1128 * Caller should use TIOCGICOUNT to see which one it was
1129 */
1130 case TIOCMIWAIT:
1131 local_irq_save(flags);
1132 /* note the counters on entry */
1133 cprev = info->icount;
1134 local_irq_restore(flags);
1135 while (1) {
1136 prepare_to_wait(&info->tport.delta_msr_wait,
1137 &wait, TASK_INTERRUPTIBLE);
1138 local_irq_save(flags);
1139 cnow = info->icount; /* atomic copy */
1140 local_irq_restore(flags);
1141 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1142 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1143 ret = -EIO; /* no change => error */
1144 break;
1145 }
1146 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1147 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1148 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1149 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1150 ret = 0;
1151 break;
1152 }
1153 schedule();
1154 /* see if a signal did it */
1155 if (signal_pending(current)) {
1156 ret = -ERESTARTSYS;
1157 break;
1158 }
1159 cprev = cnow;
1160 }
1161 finish_wait(&info->tport.delta_msr_wait, &wait);
1162 return ret;
1163
1164 default:
1165 return -ENOIOCTLCMD;
1166 }
1167 return 0;
1168}
1169
1170static void rs_set_termios(struct tty_struct *tty, const struct ktermios *old_termios)
1171{
1172 struct serial_state *info = tty->driver_data;
1173 unsigned long flags;
1174 unsigned int cflag = tty->termios.c_cflag;
1175
1176 change_speed(tty, info, old_termios);
1177
1178 /* Handle transition to B0 status */
1179 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1180 info->MCR &= ~(SER_DTR|SER_RTS);
1181 local_irq_save(flags);
1182 rtsdtr_ctrl(info->MCR);
1183 local_irq_restore(flags);
1184 }
1185
1186 /* Handle transition away from B0 status */
1187 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1188 info->MCR |= SER_DTR;
1189 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1190 info->MCR |= SER_RTS;
1191 local_irq_save(flags);
1192 rtsdtr_ctrl(info->MCR);
1193 local_irq_restore(flags);
1194 }
1195
1196 /* Handle turning off CRTSCTS */
1197 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1198 tty->hw_stopped = false;
1199 rs_start(tty);
1200 }
1201
1202#if 0
1203 /*
1204 * No need to wake up processes in open wait, since they
1205 * sample the CLOCAL flag once, and don't recheck it.
1206 * XXX It's not clear whether the current behavior is correct
1207 * or not. Hence, this may change.....
1208 */
1209 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1210 wake_up_interruptible(&info->open_wait);
1211#endif
1212}
1213
1214/*
1215 * ------------------------------------------------------------
1216 * rs_close()
1217 *
1218 * This routine is called when the serial port gets closed. First, we
1219 * wait for the last remaining data to be sent. Then, we unlink its
1220 * async structure from the interrupt chain if necessary, and we free
1221 * that IRQ if nothing is left in the chain.
1222 * ------------------------------------------------------------
1223 */
1224static void rs_close(struct tty_struct *tty, struct file * filp)
1225{
1226 struct serial_state *state = tty->driver_data;
1227 struct tty_port *port = &state->tport;
1228
1229 if (tty_port_close_start(port, tty, filp) == 0)
1230 return;
1231
1232 /*
1233 * At this point we stop accepting input. To do this, we
1234 * disable the receive line status interrupts, and tell the
1235 * interrupt driver to stop checking the data ready bit in the
1236 * line status register.
1237 */
1238 state->read_status_mask &= ~UART_LSR_DR;
1239 if (tty_port_initialized(port)) {
1240 /* disable receive interrupts */
1241 amiga_custom.intena = IF_RBF;
1242 mb();
1243 /* clear any pending receive interrupt */
1244 amiga_custom.intreq = IF_RBF;
1245 mb();
1246
1247 /*
1248 * Before we drop DTR, make sure the UART transmitter
1249 * has completely drained; this is especially
1250 * important if there is a transmit FIFO!
1251 */
1252 rs_wait_until_sent(tty, state->timeout);
1253 }
1254 shutdown(tty, state);
1255 rs_flush_buffer(tty);
1256
1257 tty_ldisc_flush(tty);
1258 port->tty = NULL;
1259
1260 tty_port_close_end(port, tty);
1261}
1262
1263/*
1264 * rs_wait_until_sent() --- wait until the transmitter is empty
1265 */
1266static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1267{
1268 struct serial_state *info = tty->driver_data;
1269 unsigned long orig_jiffies, char_time;
1270 int lsr;
1271
1272 orig_jiffies = jiffies;
1273
1274 /*
1275 * Set the check interval to be 1/5 of the estimated time to
1276 * send a single character, and make it at least 1. The check
1277 * interval should also be less than the timeout.
1278 *
1279 * Note: we have to use pretty tight timings here to satisfy
1280 * the NIST-PCTS.
1281 */
1282 char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE;
1283 char_time = char_time / 5;
1284 if (char_time == 0)
1285 char_time = 1;
1286 if (timeout)
1287 char_time = min_t(unsigned long, char_time, timeout);
1288 /*
1289 * If the transmitter hasn't cleared in twice the approximate
1290 * amount of time to send the entire FIFO, it probably won't
1291 * ever clear. This assumes the UART isn't doing flow
1292 * control, which is currently the case. Hence, if it ever
1293 * takes longer than info->timeout, this is probably due to a
1294 * UART bug of some kind. So, we clamp the timeout parameter at
1295 * 2*info->timeout.
1296 */
1297 if (!timeout || timeout > 2*info->timeout)
1298 timeout = 2*info->timeout;
1299#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1300 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1301 printk("jiff=%lu...", jiffies);
1302#endif
1303 while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) {
1304#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1305 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1306#endif
1307 msleep_interruptible(jiffies_to_msecs(char_time));
1308 if (signal_pending(current))
1309 break;
1310 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1311 break;
1312 }
1313 __set_current_state(TASK_RUNNING);
1314
1315#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1316 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1317#endif
1318}
1319
1320/*
1321 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1322 */
1323static void rs_hangup(struct tty_struct *tty)
1324{
1325 struct serial_state *info = tty->driver_data;
1326
1327 rs_flush_buffer(tty);
1328 shutdown(tty, info);
1329 info->tport.count = 0;
1330 tty_port_set_active(&info->tport, false);
1331 info->tport.tty = NULL;
1332 wake_up_interruptible(&info->tport.open_wait);
1333}
1334
1335/*
1336 * This routine is called whenever a serial port is opened. It
1337 * enables interrupts for a serial port, linking in its async structure into
1338 * the IRQ chain. It also performs the serial-specific
1339 * initialization for the tty structure.
1340 */
1341static int rs_open(struct tty_struct *tty, struct file * filp)
1342{
1343 struct tty_port *port = tty->port;
1344 struct serial_state *info = container_of(port, struct serial_state,
1345 tport);
1346 int retval;
1347
1348 port->count++;
1349 port->tty = tty;
1350 tty->driver_data = info;
1351
1352 retval = startup(tty, info);
1353 if (retval) {
1354 return retval;
1355 }
1356
1357 return tty_port_block_til_ready(port, tty, filp);
1358}
1359
1360/*
1361 * /proc fs routines....
1362 */
1363
1364static inline void line_info(struct seq_file *m, int line,
1365 struct serial_state *state)
1366{
1367 char stat_buf[30], control, status;
1368 unsigned long flags;
1369
1370 seq_printf(m, "%d: uart:amiga_builtin", line);
1371
1372 local_irq_save(flags);
1373 status = ciab.pra;
1374 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1375 local_irq_restore(flags);
1376
1377 stat_buf[0] = 0;
1378 stat_buf[1] = 0;
1379 if(!(control & SER_RTS))
1380 strcat(stat_buf, "|RTS");
1381 if(!(status & SER_CTS))
1382 strcat(stat_buf, "|CTS");
1383 if(!(control & SER_DTR))
1384 strcat(stat_buf, "|DTR");
1385 if(!(status & SER_DSR))
1386 strcat(stat_buf, "|DSR");
1387 if(!(status & SER_DCD))
1388 strcat(stat_buf, "|CD");
1389
1390 if (state->quot)
1391 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1392
1393 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1394
1395 if (state->icount.frame)
1396 seq_printf(m, " fe:%d", state->icount.frame);
1397
1398 if (state->icount.parity)
1399 seq_printf(m, " pe:%d", state->icount.parity);
1400
1401 if (state->icount.brk)
1402 seq_printf(m, " brk:%d", state->icount.brk);
1403
1404 if (state->icount.overrun)
1405 seq_printf(m, " oe:%d", state->icount.overrun);
1406
1407 /*
1408 * Last thing is the RS-232 status lines
1409 */
1410 seq_printf(m, " %s\n", stat_buf+1);
1411}
1412
1413static int rs_proc_show(struct seq_file *m, void *v)
1414{
1415 seq_printf(m, "serinfo:1.0 driver:4.30\n");
1416 line_info(m, 0, &serial_state);
1417 return 0;
1418}
1419
1420/*
1421 * ---------------------------------------------------------------------
1422 * rs_init() and friends
1423 *
1424 * rs_init() is called at boot-time to initialize the serial driver.
1425 * ---------------------------------------------------------------------
1426 */
1427
1428static const struct tty_operations serial_ops = {
1429 .open = rs_open,
1430 .close = rs_close,
1431 .write = rs_write,
1432 .put_char = rs_put_char,
1433 .flush_chars = rs_flush_chars,
1434 .write_room = rs_write_room,
1435 .chars_in_buffer = rs_chars_in_buffer,
1436 .flush_buffer = rs_flush_buffer,
1437 .ioctl = rs_ioctl,
1438 .throttle = rs_throttle,
1439 .unthrottle = rs_unthrottle,
1440 .set_termios = rs_set_termios,
1441 .stop = rs_stop,
1442 .start = rs_start,
1443 .hangup = rs_hangup,
1444 .break_ctl = rs_break,
1445 .send_xchar = rs_send_xchar,
1446 .wait_until_sent = rs_wait_until_sent,
1447 .tiocmget = rs_tiocmget,
1448 .tiocmset = rs_tiocmset,
1449 .get_icount = rs_get_icount,
1450 .set_serial = set_serial_info,
1451 .get_serial = get_serial_info,
1452 .proc_show = rs_proc_show,
1453};
1454
1455static bool amiga_carrier_raised(struct tty_port *port)
1456{
1457 return !(ciab.pra & SER_DCD);
1458}
1459
1460static void amiga_dtr_rts(struct tty_port *port, bool active)
1461{
1462 struct serial_state *info = container_of(port, struct serial_state,
1463 tport);
1464 unsigned long flags;
1465
1466 if (active)
1467 info->MCR |= SER_DTR|SER_RTS;
1468 else
1469 info->MCR &= ~(SER_DTR|SER_RTS);
1470
1471 local_irq_save(flags);
1472 rtsdtr_ctrl(info->MCR);
1473 local_irq_restore(flags);
1474}
1475
1476static const struct tty_port_operations amiga_port_ops = {
1477 .carrier_raised = amiga_carrier_raised,
1478 .dtr_rts = amiga_dtr_rts,
1479};
1480
1481/*
1482 * The serial driver boot-time initialization code!
1483 */
1484static int __init amiga_serial_probe(struct platform_device *pdev)
1485{
1486 struct serial_state *state = &serial_state;
1487 struct tty_driver *driver;
1488 unsigned long flags;
1489 int error;
1490
1491 driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
1492 if (IS_ERR(driver))
1493 return PTR_ERR(driver);
1494
1495 /* Initialize the tty_driver structure */
1496
1497 driver->driver_name = "amiserial";
1498 driver->name = "ttyS";
1499 driver->major = TTY_MAJOR;
1500 driver->minor_start = 64;
1501 driver->type = TTY_DRIVER_TYPE_SERIAL;
1502 driver->subtype = SERIAL_TYPE_NORMAL;
1503 driver->init_termios = tty_std_termios;
1504 driver->init_termios.c_cflag =
1505 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1506 tty_set_operations(driver, &serial_ops);
1507
1508 memset(state, 0, sizeof(*state));
1509 state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
1510 tty_port_init(&state->tport);
1511 state->tport.ops = &amiga_port_ops;
1512 tty_port_link_device(&state->tport, driver, 0);
1513
1514 error = tty_register_driver(driver);
1515 if (error)
1516 goto fail_tty_driver_kref_put;
1517
1518 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1519
1520 /* Hardware set up */
1521
1522 state->baud_base = amiga_colorclock;
1523
1524 /* set ISRs, and then disable the rx interrupts */
1525 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1526 if (error)
1527 goto fail_unregister;
1528
1529 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1530 "serial RX", state);
1531 if (error)
1532 goto fail_free_irq;
1533
1534 local_irq_save(flags);
1535
1536 /* turn off Rx and Tx interrupts */
1537 amiga_custom.intena = IF_RBF | IF_TBE;
1538 mb();
1539
1540 /* clear any pending interrupt */
1541 amiga_custom.intreq = IF_RBF | IF_TBE;
1542 mb();
1543
1544 local_irq_restore(flags);
1545
1546 /*
1547 * set the appropriate directions for the modem control flags,
1548 * and clear RTS and DTR
1549 */
1550 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1551 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1552
1553 platform_set_drvdata(pdev, state);
1554
1555 serial_driver = driver;
1556
1557 return 0;
1558
1559fail_free_irq:
1560 free_irq(IRQ_AMIGA_TBE, state);
1561fail_unregister:
1562 tty_unregister_driver(driver);
1563fail_tty_driver_kref_put:
1564 tty_port_destroy(&state->tport);
1565 tty_driver_kref_put(driver);
1566 return error;
1567}
1568
1569static int __exit amiga_serial_remove(struct platform_device *pdev)
1570{
1571 struct serial_state *state = platform_get_drvdata(pdev);
1572
1573 tty_unregister_driver(serial_driver);
1574 tty_driver_kref_put(serial_driver);
1575 tty_port_destroy(&state->tport);
1576
1577 free_irq(IRQ_AMIGA_TBE, state);
1578 free_irq(IRQ_AMIGA_RBF, state);
1579
1580 return 0;
1581}
1582
1583static struct platform_driver amiga_serial_driver = {
1584 .remove = __exit_p(amiga_serial_remove),
1585 .driver = {
1586 .name = "amiga-serial",
1587 },
1588};
1589
1590module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1591
1592
1593#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1594
1595/*
1596 * ------------------------------------------------------------
1597 * Serial console driver
1598 * ------------------------------------------------------------
1599 */
1600
1601static void amiga_serial_putc(char c)
1602{
1603 amiga_custom.serdat = (unsigned char)c | 0x100;
1604 while (!(amiga_custom.serdatr & 0x2000))
1605 barrier();
1606}
1607
1608/*
1609 * Print a string to the serial port trying not to disturb
1610 * any possible real use of the port...
1611 *
1612 * The console must be locked when we get here.
1613 */
1614static void serial_console_write(struct console *co, const char *s,
1615 unsigned count)
1616{
1617 unsigned short intena = amiga_custom.intenar;
1618
1619 amiga_custom.intena = IF_TBE;
1620
1621 while (count--) {
1622 if (*s == '\n')
1623 amiga_serial_putc('\r');
1624 amiga_serial_putc(*s++);
1625 }
1626
1627 amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
1628}
1629
1630static struct tty_driver *serial_console_device(struct console *c, int *index)
1631{
1632 *index = 0;
1633 return serial_driver;
1634}
1635
1636static struct console sercons = {
1637 .name = "ttyS",
1638 .write = serial_console_write,
1639 .device = serial_console_device,
1640 .flags = CON_PRINTBUFFER,
1641 .index = -1,
1642};
1643
1644/*
1645 * Register console.
1646 */
1647static int __init amiserial_console_init(void)
1648{
1649 if (!MACH_IS_AMIGA)
1650 return -ENODEV;
1651
1652 register_console(&sercons);
1653 return 0;
1654}
1655console_initcall(amiserial_console_init);
1656
1657#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1658
1659MODULE_LICENSE("GPL");
1660MODULE_ALIAS("platform:amiga-serial");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Serial driver for the amiga builtin port.
4 *
5 * This code was created by taking serial.c version 4.30 from kernel
6 * release 2.3.22, replacing all hardware related stuff with the
7 * corresponding amiga hardware actions, and removing all irrelevant
8 * code. As a consequence, it uses many of the constants and names
9 * associated with the registers and bits of 16550 compatible UARTS -
10 * but only to keep track of status, etc in the state variables. It
11 * was done this was to make it easier to keep the code in line with
12 * (non hardware specific) changes to serial.c.
13 *
14 * The port is registered with the tty driver as minor device 64, and
15 * therefore other ports should should only use 65 upwards.
16 *
17 * Richard Lucock 28/12/99
18 *
19 * Copyright (C) 1991, 1992 Linus Torvalds
20 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
21 * 1998, 1999 Theodore Ts'o
22 *
23 */
24
25#include <linux/delay.h>
26
27/* Set of debugging defines */
28
29#undef SERIAL_DEBUG_INTR
30#undef SERIAL_DEBUG_OPEN
31#undef SERIAL_DEBUG_FLOW
32#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
33
34/* Sanity checks */
35
36#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
37#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
38 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
39#else
40#define DBG_CNT(s)
41#endif
42
43/*
44 * End of serial driver configuration section.
45 */
46
47#include <linux/module.h>
48
49#include <linux/types.h>
50#include <linux/serial.h>
51#include <linux/serial_reg.h>
52static char *serial_version = "4.30";
53
54#include <linux/errno.h>
55#include <linux/signal.h>
56#include <linux/sched.h>
57#include <linux/kernel.h>
58#include <linux/timer.h>
59#include <linux/interrupt.h>
60#include <linux/tty.h>
61#include <linux/tty_flip.h>
62#include <linux/circ_buf.h>
63#include <linux/console.h>
64#include <linux/major.h>
65#include <linux/string.h>
66#include <linux/fcntl.h>
67#include <linux/ptrace.h>
68#include <linux/ioport.h>
69#include <linux/mm.h>
70#include <linux/seq_file.h>
71#include <linux/slab.h>
72#include <linux/init.h>
73#include <linux/bitops.h>
74#include <linux/platform_device.h>
75
76#include <asm/setup.h>
77
78
79#include <asm/irq.h>
80
81#include <asm/amigahw.h>
82#include <asm/amigaints.h>
83
84struct serial_state {
85 struct tty_port tport;
86 struct circ_buf xmit;
87 struct async_icount icount;
88
89 unsigned long port;
90 int baud_base;
91 int xmit_fifo_size;
92 int custom_divisor;
93 int read_status_mask;
94 int ignore_status_mask;
95 int timeout;
96 int quot;
97 int IER; /* Interrupt Enable Register */
98 int MCR; /* Modem control register */
99 int x_char; /* xon/xoff character */
100};
101
102#define custom amiga_custom
103static char *serial_name = "Amiga-builtin serial driver";
104
105static struct tty_driver *serial_driver;
106
107/* number of characters left in xmit buffer before we ask for more */
108#define WAKEUP_CHARS 256
109
110static unsigned char current_ctl_bits;
111
112static void change_speed(struct tty_struct *tty, struct serial_state *info,
113 struct ktermios *old);
114static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
115
116
117static struct serial_state rs_table[1];
118
119#define NR_PORTS ARRAY_SIZE(rs_table)
120
121#include <linux/uaccess.h>
122
123#define serial_isroot() (capable(CAP_SYS_ADMIN))
124
125/* some serial hardware definitions */
126#define SDR_OVRUN (1<<15)
127#define SDR_RBF (1<<14)
128#define SDR_TBE (1<<13)
129#define SDR_TSRE (1<<12)
130
131#define SERPER_PARENB (1<<15)
132
133#define AC_SETCLR (1<<15)
134#define AC_UARTBRK (1<<11)
135
136#define SER_DTR (1<<7)
137#define SER_RTS (1<<6)
138#define SER_DCD (1<<5)
139#define SER_CTS (1<<4)
140#define SER_DSR (1<<3)
141
142static __inline__ void rtsdtr_ctrl(int bits)
143{
144 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
145}
146
147/*
148 * ------------------------------------------------------------
149 * rs_stop() and rs_start()
150 *
151 * This routines are called before setting or resetting tty->stopped.
152 * They enable or disable transmitter interrupts, as necessary.
153 * ------------------------------------------------------------
154 */
155static void rs_stop(struct tty_struct *tty)
156{
157 struct serial_state *info = tty->driver_data;
158 unsigned long flags;
159
160 local_irq_save(flags);
161 if (info->IER & UART_IER_THRI) {
162 info->IER &= ~UART_IER_THRI;
163 /* disable Tx interrupt and remove any pending interrupts */
164 custom.intena = IF_TBE;
165 mb();
166 custom.intreq = IF_TBE;
167 mb();
168 }
169 local_irq_restore(flags);
170}
171
172static void rs_start(struct tty_struct *tty)
173{
174 struct serial_state *info = tty->driver_data;
175 unsigned long flags;
176
177 local_irq_save(flags);
178 if (info->xmit.head != info->xmit.tail
179 && info->xmit.buf
180 && !(info->IER & UART_IER_THRI)) {
181 info->IER |= UART_IER_THRI;
182 custom.intena = IF_SETCLR | IF_TBE;
183 mb();
184 /* set a pending Tx Interrupt, transmitter should restart now */
185 custom.intreq = IF_SETCLR | IF_TBE;
186 mb();
187 }
188 local_irq_restore(flags);
189}
190
191/*
192 * ----------------------------------------------------------------------
193 *
194 * Here starts the interrupt handling routines. All of the following
195 * subroutines are declared as inline and are folded into
196 * rs_interrupt(). They were separated out for readability's sake.
197 *
198 * Note: rs_interrupt() is a "fast" interrupt, which means that it
199 * runs with interrupts turned off. People who may want to modify
200 * rs_interrupt() should try to keep the interrupt handler as fast as
201 * possible. After you are done making modifications, it is not a bad
202 * idea to do:
203 *
204 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
205 *
206 * and look at the resulting assemble code in serial.s.
207 *
208 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
209 * -----------------------------------------------------------------------
210 */
211
212static void receive_chars(struct serial_state *info)
213{
214 int status;
215 int serdatr;
216 unsigned char ch, flag;
217 struct async_icount *icount;
218 int oe = 0;
219
220 icount = &info->icount;
221
222 status = UART_LSR_DR; /* We obviously have a character! */
223 serdatr = custom.serdatr;
224 mb();
225 custom.intreq = IF_RBF;
226 mb();
227
228 if((serdatr & 0x1ff) == 0)
229 status |= UART_LSR_BI;
230 if(serdatr & SDR_OVRUN)
231 status |= UART_LSR_OE;
232
233 ch = serdatr & 0xff;
234 icount->rx++;
235
236#ifdef SERIAL_DEBUG_INTR
237 printk("DR%02x:%02x...", ch, status);
238#endif
239 flag = TTY_NORMAL;
240
241 /*
242 * We don't handle parity or frame errors - but I have left
243 * the code in, since I'm not sure that the errors can't be
244 * detected.
245 */
246
247 if (status & (UART_LSR_BI | UART_LSR_PE |
248 UART_LSR_FE | UART_LSR_OE)) {
249 /*
250 * For statistics only
251 */
252 if (status & UART_LSR_BI) {
253 status &= ~(UART_LSR_FE | UART_LSR_PE);
254 icount->brk++;
255 } else if (status & UART_LSR_PE)
256 icount->parity++;
257 else if (status & UART_LSR_FE)
258 icount->frame++;
259 if (status & UART_LSR_OE)
260 icount->overrun++;
261
262 /*
263 * Now check to see if character should be
264 * ignored, and mask off conditions which
265 * should be ignored.
266 */
267 if (status & info->ignore_status_mask)
268 goto out;
269
270 status &= info->read_status_mask;
271
272 if (status & (UART_LSR_BI)) {
273#ifdef SERIAL_DEBUG_INTR
274 printk("handling break....");
275#endif
276 flag = TTY_BREAK;
277 if (info->tport.flags & ASYNC_SAK)
278 do_SAK(info->tport.tty);
279 } else if (status & UART_LSR_PE)
280 flag = TTY_PARITY;
281 else if (status & UART_LSR_FE)
282 flag = TTY_FRAME;
283 if (status & UART_LSR_OE) {
284 /*
285 * Overrun is special, since it's
286 * reported immediately, and doesn't
287 * affect the current character
288 */
289 oe = 1;
290 }
291 }
292 tty_insert_flip_char(&info->tport, ch, flag);
293 if (oe == 1)
294 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
295 tty_flip_buffer_push(&info->tport);
296out:
297 return;
298}
299
300static void transmit_chars(struct serial_state *info)
301{
302 custom.intreq = IF_TBE;
303 mb();
304 if (info->x_char) {
305 custom.serdat = info->x_char | 0x100;
306 mb();
307 info->icount.tx++;
308 info->x_char = 0;
309 return;
310 }
311 if (info->xmit.head == info->xmit.tail
312 || info->tport.tty->stopped
313 || info->tport.tty->hw_stopped) {
314 info->IER &= ~UART_IER_THRI;
315 custom.intena = IF_TBE;
316 mb();
317 return;
318 }
319
320 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
321 mb();
322 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
323 info->icount.tx++;
324
325 if (CIRC_CNT(info->xmit.head,
326 info->xmit.tail,
327 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
328 tty_wakeup(info->tport.tty);
329
330#ifdef SERIAL_DEBUG_INTR
331 printk("THRE...");
332#endif
333 if (info->xmit.head == info->xmit.tail) {
334 custom.intena = IF_TBE;
335 mb();
336 info->IER &= ~UART_IER_THRI;
337 }
338}
339
340static void check_modem_status(struct serial_state *info)
341{
342 struct tty_port *port = &info->tport;
343 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
344 unsigned char dstatus;
345 struct async_icount *icount;
346
347 /* Determine bits that have changed */
348 dstatus = status ^ current_ctl_bits;
349 current_ctl_bits = status;
350
351 if (dstatus) {
352 icount = &info->icount;
353 /* update input line counters */
354 if (dstatus & SER_DSR)
355 icount->dsr++;
356 if (dstatus & SER_DCD) {
357 icount->dcd++;
358 }
359 if (dstatus & SER_CTS)
360 icount->cts++;
361 wake_up_interruptible(&port->delta_msr_wait);
362 }
363
364 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
365#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
366 printk("ttyS%d CD now %s...", info->line,
367 (!(status & SER_DCD)) ? "on" : "off");
368#endif
369 if (!(status & SER_DCD))
370 wake_up_interruptible(&port->open_wait);
371 else {
372#ifdef SERIAL_DEBUG_OPEN
373 printk("doing serial hangup...");
374#endif
375 if (port->tty)
376 tty_hangup(port->tty);
377 }
378 }
379 if (tty_port_cts_enabled(port)) {
380 if (port->tty->hw_stopped) {
381 if (!(status & SER_CTS)) {
382#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
383 printk("CTS tx start...");
384#endif
385 port->tty->hw_stopped = 0;
386 info->IER |= UART_IER_THRI;
387 custom.intena = IF_SETCLR | IF_TBE;
388 mb();
389 /* set a pending Tx Interrupt, transmitter should restart now */
390 custom.intreq = IF_SETCLR | IF_TBE;
391 mb();
392 tty_wakeup(port->tty);
393 return;
394 }
395 } else {
396 if ((status & SER_CTS)) {
397#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
398 printk("CTS tx stop...");
399#endif
400 port->tty->hw_stopped = 1;
401 info->IER &= ~UART_IER_THRI;
402 /* disable Tx interrupt and remove any pending interrupts */
403 custom.intena = IF_TBE;
404 mb();
405 custom.intreq = IF_TBE;
406 mb();
407 }
408 }
409 }
410}
411
412static irqreturn_t ser_vbl_int( int irq, void *data)
413{
414 /* vbl is just a periodic interrupt we tie into to update modem status */
415 struct serial_state *info = data;
416 /*
417 * TBD - is it better to unregister from this interrupt or to
418 * ignore it if MSI is clear ?
419 */
420 if(info->IER & UART_IER_MSI)
421 check_modem_status(info);
422 return IRQ_HANDLED;
423}
424
425static irqreturn_t ser_rx_int(int irq, void *dev_id)
426{
427 struct serial_state *info = dev_id;
428
429#ifdef SERIAL_DEBUG_INTR
430 printk("ser_rx_int...");
431#endif
432
433 if (!info->tport.tty)
434 return IRQ_NONE;
435
436 receive_chars(info);
437#ifdef SERIAL_DEBUG_INTR
438 printk("end.\n");
439#endif
440 return IRQ_HANDLED;
441}
442
443static irqreturn_t ser_tx_int(int irq, void *dev_id)
444{
445 struct serial_state *info = dev_id;
446
447 if (custom.serdatr & SDR_TBE) {
448#ifdef SERIAL_DEBUG_INTR
449 printk("ser_tx_int...");
450#endif
451
452 if (!info->tport.tty)
453 return IRQ_NONE;
454
455 transmit_chars(info);
456#ifdef SERIAL_DEBUG_INTR
457 printk("end.\n");
458#endif
459 }
460 return IRQ_HANDLED;
461}
462
463/*
464 * -------------------------------------------------------------------
465 * Here ends the serial interrupt routines.
466 * -------------------------------------------------------------------
467 */
468
469/*
470 * ---------------------------------------------------------------
471 * Low level utility subroutines for the serial driver: routines to
472 * figure out the appropriate timeout for an interrupt chain, routines
473 * to initialize and startup a serial port, and routines to shutdown a
474 * serial port. Useful stuff like that.
475 * ---------------------------------------------------------------
476 */
477
478static int startup(struct tty_struct *tty, struct serial_state *info)
479{
480 struct tty_port *port = &info->tport;
481 unsigned long flags;
482 int retval=0;
483 unsigned long page;
484
485 page = get_zeroed_page(GFP_KERNEL);
486 if (!page)
487 return -ENOMEM;
488
489 local_irq_save(flags);
490
491 if (tty_port_initialized(port)) {
492 free_page(page);
493 goto errout;
494 }
495
496 if (info->xmit.buf)
497 free_page(page);
498 else
499 info->xmit.buf = (unsigned char *) page;
500
501#ifdef SERIAL_DEBUG_OPEN
502 printk("starting up ttys%d ...", info->line);
503#endif
504
505 /* Clear anything in the input buffer */
506
507 custom.intreq = IF_RBF;
508 mb();
509
510 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
511 if (retval) {
512 if (serial_isroot()) {
513 set_bit(TTY_IO_ERROR, &tty->flags);
514 retval = 0;
515 }
516 goto errout;
517 }
518
519 /* enable both Rx and Tx interrupts */
520 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
521 mb();
522 info->IER = UART_IER_MSI;
523
524 /* remember current state of the DCD and CTS bits */
525 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
526
527 info->MCR = 0;
528 if (C_BAUD(tty))
529 info->MCR = SER_DTR | SER_RTS;
530 rtsdtr_ctrl(info->MCR);
531
532 clear_bit(TTY_IO_ERROR, &tty->flags);
533 info->xmit.head = info->xmit.tail = 0;
534
535 /*
536 * and set the speed of the serial port
537 */
538 change_speed(tty, info, NULL);
539
540 tty_port_set_initialized(port, 1);
541 local_irq_restore(flags);
542 return 0;
543
544errout:
545 local_irq_restore(flags);
546 return retval;
547}
548
549/*
550 * This routine will shutdown a serial port; interrupts are disabled, and
551 * DTR is dropped if the hangup on close termio flag is on.
552 */
553static void shutdown(struct tty_struct *tty, struct serial_state *info)
554{
555 unsigned long flags;
556 struct serial_state *state;
557
558 if (!tty_port_initialized(&info->tport))
559 return;
560
561 state = info;
562
563#ifdef SERIAL_DEBUG_OPEN
564 printk("Shutting down serial port %d ....\n", info->line);
565#endif
566
567 local_irq_save(flags); /* Disable interrupts */
568
569 /*
570 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
571 * here so the queue might never be waken up
572 */
573 wake_up_interruptible(&info->tport.delta_msr_wait);
574
575 /*
576 * Free the IRQ, if necessary
577 */
578 free_irq(IRQ_AMIGA_VERTB, info);
579
580 if (info->xmit.buf) {
581 free_page((unsigned long) info->xmit.buf);
582 info->xmit.buf = NULL;
583 }
584
585 info->IER = 0;
586 custom.intena = IF_RBF | IF_TBE;
587 mb();
588
589 /* disable break condition */
590 custom.adkcon = AC_UARTBRK;
591 mb();
592
593 if (C_HUPCL(tty))
594 info->MCR &= ~(SER_DTR|SER_RTS);
595 rtsdtr_ctrl(info->MCR);
596
597 set_bit(TTY_IO_ERROR, &tty->flags);
598
599 tty_port_set_initialized(&info->tport, 0);
600 local_irq_restore(flags);
601}
602
603
604/*
605 * This routine is called to set the UART divisor registers to match
606 * the specified baud rate for a serial port.
607 */
608static void change_speed(struct tty_struct *tty, struct serial_state *info,
609 struct ktermios *old_termios)
610{
611 struct tty_port *port = &info->tport;
612 int quot = 0, baud_base, baud;
613 unsigned cflag, cval = 0;
614 int bits;
615 unsigned long flags;
616
617 cflag = tty->termios.c_cflag;
618
619 /* Byte size is always 8 bits plus parity bit if requested */
620
621 cval = 3; bits = 10;
622 if (cflag & CSTOPB) {
623 cval |= 0x04;
624 bits++;
625 }
626 if (cflag & PARENB) {
627 cval |= UART_LCR_PARITY;
628 bits++;
629 }
630 if (!(cflag & PARODD))
631 cval |= UART_LCR_EPAR;
632#ifdef CMSPAR
633 if (cflag & CMSPAR)
634 cval |= UART_LCR_SPAR;
635#endif
636
637 /* Determine divisor based on baud rate */
638 baud = tty_get_baud_rate(tty);
639 if (!baud)
640 baud = 9600; /* B0 transition handled in rs_set_termios */
641 baud_base = info->baud_base;
642 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
643 quot = info->custom_divisor;
644 else {
645 if (baud == 134)
646 /* Special case since 134 is really 134.5 */
647 quot = (2*baud_base / 269);
648 else if (baud)
649 quot = baud_base / baud;
650 }
651 /* If the quotient is zero refuse the change */
652 if (!quot && old_termios) {
653 /* FIXME: Will need updating for new tty in the end */
654 tty->termios.c_cflag &= ~CBAUD;
655 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
656 baud = tty_get_baud_rate(tty);
657 if (!baud)
658 baud = 9600;
659 if (baud == 38400 &&
660 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
661 quot = info->custom_divisor;
662 else {
663 if (baud == 134)
664 /* Special case since 134 is really 134.5 */
665 quot = (2*baud_base / 269);
666 else if (baud)
667 quot = baud_base / baud;
668 }
669 }
670 /* As a last resort, if the quotient is zero, default to 9600 bps */
671 if (!quot)
672 quot = baud_base / 9600;
673 info->quot = quot;
674 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
675 info->timeout += HZ/50; /* Add .02 seconds of slop */
676
677 /* CTS flow control flag and modem status interrupts */
678 info->IER &= ~UART_IER_MSI;
679 if (port->flags & ASYNC_HARDPPS_CD)
680 info->IER |= UART_IER_MSI;
681 tty_port_set_cts_flow(port, cflag & CRTSCTS);
682 if (cflag & CRTSCTS)
683 info->IER |= UART_IER_MSI;
684 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
685 if (~cflag & CLOCAL)
686 info->IER |= UART_IER_MSI;
687 /* TBD:
688 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
689 */
690
691 /*
692 * Set up parity check flag
693 */
694
695 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
696 if (I_INPCK(tty))
697 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
698 if (I_BRKINT(tty) || I_PARMRK(tty))
699 info->read_status_mask |= UART_LSR_BI;
700
701 /*
702 * Characters to ignore
703 */
704 info->ignore_status_mask = 0;
705 if (I_IGNPAR(tty))
706 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
707 if (I_IGNBRK(tty)) {
708 info->ignore_status_mask |= UART_LSR_BI;
709 /*
710 * If we're ignore parity and break indicators, ignore
711 * overruns too. (For real raw support).
712 */
713 if (I_IGNPAR(tty))
714 info->ignore_status_mask |= UART_LSR_OE;
715 }
716 /*
717 * !!! ignore all characters if CREAD is not set
718 */
719 if ((cflag & CREAD) == 0)
720 info->ignore_status_mask |= UART_LSR_DR;
721 local_irq_save(flags);
722
723 {
724 short serper;
725
726 /* Set up the baud rate */
727 serper = quot - 1;
728
729 /* Enable or disable parity bit */
730
731 if(cval & UART_LCR_PARITY)
732 serper |= (SERPER_PARENB);
733
734 custom.serper = serper;
735 mb();
736 }
737
738 local_irq_restore(flags);
739}
740
741static int rs_put_char(struct tty_struct *tty, unsigned char ch)
742{
743 struct serial_state *info;
744 unsigned long flags;
745
746 info = tty->driver_data;
747
748 if (!info->xmit.buf)
749 return 0;
750
751 local_irq_save(flags);
752 if (CIRC_SPACE(info->xmit.head,
753 info->xmit.tail,
754 SERIAL_XMIT_SIZE) == 0) {
755 local_irq_restore(flags);
756 return 0;
757 }
758
759 info->xmit.buf[info->xmit.head++] = ch;
760 info->xmit.head &= SERIAL_XMIT_SIZE-1;
761 local_irq_restore(flags);
762 return 1;
763}
764
765static void rs_flush_chars(struct tty_struct *tty)
766{
767 struct serial_state *info = tty->driver_data;
768 unsigned long flags;
769
770 if (info->xmit.head == info->xmit.tail
771 || tty->stopped
772 || tty->hw_stopped
773 || !info->xmit.buf)
774 return;
775
776 local_irq_save(flags);
777 info->IER |= UART_IER_THRI;
778 custom.intena = IF_SETCLR | IF_TBE;
779 mb();
780 /* set a pending Tx Interrupt, transmitter should restart now */
781 custom.intreq = IF_SETCLR | IF_TBE;
782 mb();
783 local_irq_restore(flags);
784}
785
786static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
787{
788 int c, ret = 0;
789 struct serial_state *info = tty->driver_data;
790 unsigned long flags;
791
792 if (!info->xmit.buf)
793 return 0;
794
795 local_irq_save(flags);
796 while (1) {
797 c = CIRC_SPACE_TO_END(info->xmit.head,
798 info->xmit.tail,
799 SERIAL_XMIT_SIZE);
800 if (count < c)
801 c = count;
802 if (c <= 0) {
803 break;
804 }
805 memcpy(info->xmit.buf + info->xmit.head, buf, c);
806 info->xmit.head = ((info->xmit.head + c) &
807 (SERIAL_XMIT_SIZE-1));
808 buf += c;
809 count -= c;
810 ret += c;
811 }
812 local_irq_restore(flags);
813
814 if (info->xmit.head != info->xmit.tail
815 && !tty->stopped
816 && !tty->hw_stopped
817 && !(info->IER & UART_IER_THRI)) {
818 info->IER |= UART_IER_THRI;
819 local_irq_disable();
820 custom.intena = IF_SETCLR | IF_TBE;
821 mb();
822 /* set a pending Tx Interrupt, transmitter should restart now */
823 custom.intreq = IF_SETCLR | IF_TBE;
824 mb();
825 local_irq_restore(flags);
826 }
827 return ret;
828}
829
830static int rs_write_room(struct tty_struct *tty)
831{
832 struct serial_state *info = tty->driver_data;
833
834 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
835}
836
837static int rs_chars_in_buffer(struct tty_struct *tty)
838{
839 struct serial_state *info = tty->driver_data;
840
841 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
842}
843
844static void rs_flush_buffer(struct tty_struct *tty)
845{
846 struct serial_state *info = tty->driver_data;
847 unsigned long flags;
848
849 local_irq_save(flags);
850 info->xmit.head = info->xmit.tail = 0;
851 local_irq_restore(flags);
852 tty_wakeup(tty);
853}
854
855/*
856 * This function is used to send a high-priority XON/XOFF character to
857 * the device
858 */
859static void rs_send_xchar(struct tty_struct *tty, char ch)
860{
861 struct serial_state *info = tty->driver_data;
862 unsigned long flags;
863
864 info->x_char = ch;
865 if (ch) {
866 /* Make sure transmit interrupts are on */
867
868 /* Check this ! */
869 local_irq_save(flags);
870 if(!(custom.intenar & IF_TBE)) {
871 custom.intena = IF_SETCLR | IF_TBE;
872 mb();
873 /* set a pending Tx Interrupt, transmitter should restart now */
874 custom.intreq = IF_SETCLR | IF_TBE;
875 mb();
876 }
877 local_irq_restore(flags);
878
879 info->IER |= UART_IER_THRI;
880 }
881}
882
883/*
884 * ------------------------------------------------------------
885 * rs_throttle()
886 *
887 * This routine is called by the upper-layer tty layer to signal that
888 * incoming characters should be throttled.
889 * ------------------------------------------------------------
890 */
891static void rs_throttle(struct tty_struct * tty)
892{
893 struct serial_state *info = tty->driver_data;
894 unsigned long flags;
895#ifdef SERIAL_DEBUG_THROTTLE
896 printk("throttle %s ....\n", tty_name(tty));
897#endif
898
899 if (I_IXOFF(tty))
900 rs_send_xchar(tty, STOP_CHAR(tty));
901
902 if (C_CRTSCTS(tty))
903 info->MCR &= ~SER_RTS;
904
905 local_irq_save(flags);
906 rtsdtr_ctrl(info->MCR);
907 local_irq_restore(flags);
908}
909
910static void rs_unthrottle(struct tty_struct * tty)
911{
912 struct serial_state *info = tty->driver_data;
913 unsigned long flags;
914#ifdef SERIAL_DEBUG_THROTTLE
915 printk("unthrottle %s ....\n", tty_name(tty));
916#endif
917
918 if (I_IXOFF(tty)) {
919 if (info->x_char)
920 info->x_char = 0;
921 else
922 rs_send_xchar(tty, START_CHAR(tty));
923 }
924 if (C_CRTSCTS(tty))
925 info->MCR |= SER_RTS;
926 local_irq_save(flags);
927 rtsdtr_ctrl(info->MCR);
928 local_irq_restore(flags);
929}
930
931/*
932 * ------------------------------------------------------------
933 * rs_ioctl() and friends
934 * ------------------------------------------------------------
935 */
936
937static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
938{
939 struct serial_state *state = tty->driver_data;
940
941 tty_lock(tty);
942 ss->line = tty->index;
943 ss->port = state->port;
944 ss->flags = state->tport.flags;
945 ss->xmit_fifo_size = state->xmit_fifo_size;
946 ss->baud_base = state->baud_base;
947 ss->close_delay = state->tport.close_delay;
948 ss->closing_wait = state->tport.closing_wait;
949 ss->custom_divisor = state->custom_divisor;
950 tty_unlock(tty);
951 return 0;
952}
953
954static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
955{
956 struct serial_state *state = tty->driver_data;
957 struct tty_port *port = &state->tport;
958 bool change_spd;
959 int retval = 0;
960
961 tty_lock(tty);
962 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
963 ss->custom_divisor != state->custom_divisor;
964 if (ss->irq || ss->port != state->port ||
965 ss->xmit_fifo_size != state->xmit_fifo_size) {
966 tty_unlock(tty);
967 return -EINVAL;
968 }
969
970 if (!serial_isroot()) {
971 if ((ss->baud_base != state->baud_base) ||
972 (ss->close_delay != port->close_delay) ||
973 (ss->xmit_fifo_size != state->xmit_fifo_size) ||
974 ((ss->flags & ~ASYNC_USR_MASK) !=
975 (port->flags & ~ASYNC_USR_MASK))) {
976 tty_unlock(tty);
977 return -EPERM;
978 }
979 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
980 (ss->flags & ASYNC_USR_MASK));
981 state->custom_divisor = ss->custom_divisor;
982 goto check_and_exit;
983 }
984
985 if (ss->baud_base < 9600) {
986 tty_unlock(tty);
987 return -EINVAL;
988 }
989
990 /*
991 * OK, past this point, all the error checking has been done.
992 * At this point, we start making changes.....
993 */
994
995 state->baud_base = ss->baud_base;
996 port->flags = ((port->flags & ~ASYNC_FLAGS) |
997 (ss->flags & ASYNC_FLAGS));
998 state->custom_divisor = ss->custom_divisor;
999 port->close_delay = ss->close_delay * HZ/100;
1000 port->closing_wait = ss->closing_wait * HZ/100;
1001 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1002
1003check_and_exit:
1004 if (tty_port_initialized(port)) {
1005 if (change_spd) {
1006 /* warn about deprecation unless clearing */
1007 if (ss->flags & ASYNC_SPD_MASK)
1008 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
1009 change_speed(tty, state, NULL);
1010 }
1011 } else
1012 retval = startup(tty, state);
1013 tty_unlock(tty);
1014 return retval;
1015}
1016
1017/*
1018 * get_lsr_info - get line status register info
1019 *
1020 * Purpose: Let user call ioctl() to get info when the UART physically
1021 * is emptied. On bus types like RS485, the transmitter must
1022 * release the bus after transmitting. This must be done when
1023 * the transmit shift register is empty, not be done when the
1024 * transmit holding register is empty. This functionality
1025 * allows an RS485 driver to be written in user space.
1026 */
1027static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1028{
1029 unsigned char status;
1030 unsigned int result;
1031 unsigned long flags;
1032
1033 local_irq_save(flags);
1034 status = custom.serdatr;
1035 mb();
1036 local_irq_restore(flags);
1037 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1038 if (copy_to_user(value, &result, sizeof(int)))
1039 return -EFAULT;
1040 return 0;
1041}
1042
1043
1044static int rs_tiocmget(struct tty_struct *tty)
1045{
1046 struct serial_state *info = tty->driver_data;
1047 unsigned char control, status;
1048 unsigned long flags;
1049
1050 if (tty_io_error(tty))
1051 return -EIO;
1052
1053 control = info->MCR;
1054 local_irq_save(flags);
1055 status = ciab.pra;
1056 local_irq_restore(flags);
1057 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1058 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1059 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1060 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1061 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1062}
1063
1064static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1065 unsigned int clear)
1066{
1067 struct serial_state *info = tty->driver_data;
1068 unsigned long flags;
1069
1070 if (tty_io_error(tty))
1071 return -EIO;
1072
1073 local_irq_save(flags);
1074 if (set & TIOCM_RTS)
1075 info->MCR |= SER_RTS;
1076 if (set & TIOCM_DTR)
1077 info->MCR |= SER_DTR;
1078 if (clear & TIOCM_RTS)
1079 info->MCR &= ~SER_RTS;
1080 if (clear & TIOCM_DTR)
1081 info->MCR &= ~SER_DTR;
1082 rtsdtr_ctrl(info->MCR);
1083 local_irq_restore(flags);
1084 return 0;
1085}
1086
1087/*
1088 * rs_break() --- routine which turns the break handling on or off
1089 */
1090static int rs_break(struct tty_struct *tty, int break_state)
1091{
1092 unsigned long flags;
1093
1094 local_irq_save(flags);
1095 if (break_state == -1)
1096 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1097 else
1098 custom.adkcon = AC_UARTBRK;
1099 mb();
1100 local_irq_restore(flags);
1101 return 0;
1102}
1103
1104/*
1105 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1106 * Return: write counters to the user passed counter struct
1107 * NB: both 1->0 and 0->1 transitions are counted except for
1108 * RI where only 0->1 is counted.
1109 */
1110static int rs_get_icount(struct tty_struct *tty,
1111 struct serial_icounter_struct *icount)
1112{
1113 struct serial_state *info = tty->driver_data;
1114 struct async_icount cnow;
1115 unsigned long flags;
1116
1117 local_irq_save(flags);
1118 cnow = info->icount;
1119 local_irq_restore(flags);
1120 icount->cts = cnow.cts;
1121 icount->dsr = cnow.dsr;
1122 icount->rng = cnow.rng;
1123 icount->dcd = cnow.dcd;
1124 icount->rx = cnow.rx;
1125 icount->tx = cnow.tx;
1126 icount->frame = cnow.frame;
1127 icount->overrun = cnow.overrun;
1128 icount->parity = cnow.parity;
1129 icount->brk = cnow.brk;
1130 icount->buf_overrun = cnow.buf_overrun;
1131
1132 return 0;
1133}
1134
1135static int rs_ioctl(struct tty_struct *tty,
1136 unsigned int cmd, unsigned long arg)
1137{
1138 struct serial_state *info = tty->driver_data;
1139 struct async_icount cprev, cnow; /* kernel counter temps */
1140 void __user *argp = (void __user *)arg;
1141 unsigned long flags;
1142 DEFINE_WAIT(wait);
1143 int ret;
1144
1145 if ((cmd != TIOCSERCONFIG) &&
1146 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1147 if (tty_io_error(tty))
1148 return -EIO;
1149 }
1150
1151 switch (cmd) {
1152 case TIOCSERCONFIG:
1153 return 0;
1154
1155 case TIOCSERGETLSR: /* Get line status register */
1156 return get_lsr_info(info, argp);
1157
1158 /*
1159 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1160 * - mask passed in arg for lines of interest
1161 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1162 * Caller should use TIOCGICOUNT to see which one it was
1163 */
1164 case TIOCMIWAIT:
1165 local_irq_save(flags);
1166 /* note the counters on entry */
1167 cprev = info->icount;
1168 local_irq_restore(flags);
1169 while (1) {
1170 prepare_to_wait(&info->tport.delta_msr_wait,
1171 &wait, TASK_INTERRUPTIBLE);
1172 local_irq_save(flags);
1173 cnow = info->icount; /* atomic copy */
1174 local_irq_restore(flags);
1175 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1176 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1177 ret = -EIO; /* no change => error */
1178 break;
1179 }
1180 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1181 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1182 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1183 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1184 ret = 0;
1185 break;
1186 }
1187 schedule();
1188 /* see if a signal did it */
1189 if (signal_pending(current)) {
1190 ret = -ERESTARTSYS;
1191 break;
1192 }
1193 cprev = cnow;
1194 }
1195 finish_wait(&info->tport.delta_msr_wait, &wait);
1196 return ret;
1197
1198 default:
1199 return -ENOIOCTLCMD;
1200 }
1201 return 0;
1202}
1203
1204static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1205{
1206 struct serial_state *info = tty->driver_data;
1207 unsigned long flags;
1208 unsigned int cflag = tty->termios.c_cflag;
1209
1210 change_speed(tty, info, old_termios);
1211
1212 /* Handle transition to B0 status */
1213 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1214 info->MCR &= ~(SER_DTR|SER_RTS);
1215 local_irq_save(flags);
1216 rtsdtr_ctrl(info->MCR);
1217 local_irq_restore(flags);
1218 }
1219
1220 /* Handle transition away from B0 status */
1221 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1222 info->MCR |= SER_DTR;
1223 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1224 info->MCR |= SER_RTS;
1225 local_irq_save(flags);
1226 rtsdtr_ctrl(info->MCR);
1227 local_irq_restore(flags);
1228 }
1229
1230 /* Handle turning off CRTSCTS */
1231 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1232 tty->hw_stopped = 0;
1233 rs_start(tty);
1234 }
1235
1236#if 0
1237 /*
1238 * No need to wake up processes in open wait, since they
1239 * sample the CLOCAL flag once, and don't recheck it.
1240 * XXX It's not clear whether the current behavior is correct
1241 * or not. Hence, this may change.....
1242 */
1243 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1244 wake_up_interruptible(&info->open_wait);
1245#endif
1246}
1247
1248/*
1249 * ------------------------------------------------------------
1250 * rs_close()
1251 *
1252 * This routine is called when the serial port gets closed. First, we
1253 * wait for the last remaining data to be sent. Then, we unlink its
1254 * async structure from the interrupt chain if necessary, and we free
1255 * that IRQ if nothing is left in the chain.
1256 * ------------------------------------------------------------
1257 */
1258static void rs_close(struct tty_struct *tty, struct file * filp)
1259{
1260 struct serial_state *state = tty->driver_data;
1261 struct tty_port *port = &state->tport;
1262
1263 if (tty_port_close_start(port, tty, filp) == 0)
1264 return;
1265
1266 /*
1267 * At this point we stop accepting input. To do this, we
1268 * disable the receive line status interrupts, and tell the
1269 * interrupt driver to stop checking the data ready bit in the
1270 * line status register.
1271 */
1272 state->read_status_mask &= ~UART_LSR_DR;
1273 if (tty_port_initialized(port)) {
1274 /* disable receive interrupts */
1275 custom.intena = IF_RBF;
1276 mb();
1277 /* clear any pending receive interrupt */
1278 custom.intreq = IF_RBF;
1279 mb();
1280
1281 /*
1282 * Before we drop DTR, make sure the UART transmitter
1283 * has completely drained; this is especially
1284 * important if there is a transmit FIFO!
1285 */
1286 rs_wait_until_sent(tty, state->timeout);
1287 }
1288 shutdown(tty, state);
1289 rs_flush_buffer(tty);
1290
1291 tty_ldisc_flush(tty);
1292 port->tty = NULL;
1293
1294 tty_port_close_end(port, tty);
1295}
1296
1297/*
1298 * rs_wait_until_sent() --- wait until the transmitter is empty
1299 */
1300static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1301{
1302 struct serial_state *info = tty->driver_data;
1303 unsigned long orig_jiffies, char_time;
1304 int lsr;
1305
1306 if (info->xmit_fifo_size == 0)
1307 return; /* Just in case.... */
1308
1309 orig_jiffies = jiffies;
1310
1311 /*
1312 * Set the check interval to be 1/5 of the estimated time to
1313 * send a single character, and make it at least 1. The check
1314 * interval should also be less than the timeout.
1315 *
1316 * Note: we have to use pretty tight timings here to satisfy
1317 * the NIST-PCTS.
1318 */
1319 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1320 char_time = char_time / 5;
1321 if (char_time == 0)
1322 char_time = 1;
1323 if (timeout)
1324 char_time = min_t(unsigned long, char_time, timeout);
1325 /*
1326 * If the transmitter hasn't cleared in twice the approximate
1327 * amount of time to send the entire FIFO, it probably won't
1328 * ever clear. This assumes the UART isn't doing flow
1329 * control, which is currently the case. Hence, if it ever
1330 * takes longer than info->timeout, this is probably due to a
1331 * UART bug of some kind. So, we clamp the timeout parameter at
1332 * 2*info->timeout.
1333 */
1334 if (!timeout || timeout > 2*info->timeout)
1335 timeout = 2*info->timeout;
1336#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1337 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1338 printk("jiff=%lu...", jiffies);
1339#endif
1340 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1341#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1342 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1343#endif
1344 msleep_interruptible(jiffies_to_msecs(char_time));
1345 if (signal_pending(current))
1346 break;
1347 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1348 break;
1349 }
1350 __set_current_state(TASK_RUNNING);
1351
1352#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1353 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1354#endif
1355}
1356
1357/*
1358 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1359 */
1360static void rs_hangup(struct tty_struct *tty)
1361{
1362 struct serial_state *info = tty->driver_data;
1363
1364 rs_flush_buffer(tty);
1365 shutdown(tty, info);
1366 info->tport.count = 0;
1367 tty_port_set_active(&info->tport, 0);
1368 info->tport.tty = NULL;
1369 wake_up_interruptible(&info->tport.open_wait);
1370}
1371
1372/*
1373 * This routine is called whenever a serial port is opened. It
1374 * enables interrupts for a serial port, linking in its async structure into
1375 * the IRQ chain. It also performs the serial-specific
1376 * initialization for the tty structure.
1377 */
1378static int rs_open(struct tty_struct *tty, struct file * filp)
1379{
1380 struct serial_state *info = rs_table + tty->index;
1381 struct tty_port *port = &info->tport;
1382 int retval;
1383
1384 port->count++;
1385 port->tty = tty;
1386 tty->driver_data = info;
1387 tty->port = port;
1388
1389 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1390
1391 retval = startup(tty, info);
1392 if (retval) {
1393 return retval;
1394 }
1395
1396 return tty_port_block_til_ready(port, tty, filp);
1397}
1398
1399/*
1400 * /proc fs routines....
1401 */
1402
1403static inline void line_info(struct seq_file *m, int line,
1404 struct serial_state *state)
1405{
1406 char stat_buf[30], control, status;
1407 unsigned long flags;
1408
1409 seq_printf(m, "%d: uart:amiga_builtin", line);
1410
1411 local_irq_save(flags);
1412 status = ciab.pra;
1413 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1414 local_irq_restore(flags);
1415
1416 stat_buf[0] = 0;
1417 stat_buf[1] = 0;
1418 if(!(control & SER_RTS))
1419 strcat(stat_buf, "|RTS");
1420 if(!(status & SER_CTS))
1421 strcat(stat_buf, "|CTS");
1422 if(!(control & SER_DTR))
1423 strcat(stat_buf, "|DTR");
1424 if(!(status & SER_DSR))
1425 strcat(stat_buf, "|DSR");
1426 if(!(status & SER_DCD))
1427 strcat(stat_buf, "|CD");
1428
1429 if (state->quot)
1430 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1431
1432 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1433
1434 if (state->icount.frame)
1435 seq_printf(m, " fe:%d", state->icount.frame);
1436
1437 if (state->icount.parity)
1438 seq_printf(m, " pe:%d", state->icount.parity);
1439
1440 if (state->icount.brk)
1441 seq_printf(m, " brk:%d", state->icount.brk);
1442
1443 if (state->icount.overrun)
1444 seq_printf(m, " oe:%d", state->icount.overrun);
1445
1446 /*
1447 * Last thing is the RS-232 status lines
1448 */
1449 seq_printf(m, " %s\n", stat_buf+1);
1450}
1451
1452static int rs_proc_show(struct seq_file *m, void *v)
1453{
1454 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1455 line_info(m, 0, &rs_table[0]);
1456 return 0;
1457}
1458
1459/*
1460 * ---------------------------------------------------------------------
1461 * rs_init() and friends
1462 *
1463 * rs_init() is called at boot-time to initialize the serial driver.
1464 * ---------------------------------------------------------------------
1465 */
1466
1467/*
1468 * This routine prints out the appropriate serial driver version
1469 * number, and identifies which options were configured into this
1470 * driver.
1471 */
1472static void show_serial_version(void)
1473{
1474 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1475}
1476
1477
1478static const struct tty_operations serial_ops = {
1479 .open = rs_open,
1480 .close = rs_close,
1481 .write = rs_write,
1482 .put_char = rs_put_char,
1483 .flush_chars = rs_flush_chars,
1484 .write_room = rs_write_room,
1485 .chars_in_buffer = rs_chars_in_buffer,
1486 .flush_buffer = rs_flush_buffer,
1487 .ioctl = rs_ioctl,
1488 .throttle = rs_throttle,
1489 .unthrottle = rs_unthrottle,
1490 .set_termios = rs_set_termios,
1491 .stop = rs_stop,
1492 .start = rs_start,
1493 .hangup = rs_hangup,
1494 .break_ctl = rs_break,
1495 .send_xchar = rs_send_xchar,
1496 .wait_until_sent = rs_wait_until_sent,
1497 .tiocmget = rs_tiocmget,
1498 .tiocmset = rs_tiocmset,
1499 .get_icount = rs_get_icount,
1500 .set_serial = set_serial_info,
1501 .get_serial = get_serial_info,
1502 .proc_show = rs_proc_show,
1503};
1504
1505static int amiga_carrier_raised(struct tty_port *port)
1506{
1507 return !(ciab.pra & SER_DCD);
1508}
1509
1510static void amiga_dtr_rts(struct tty_port *port, int raise)
1511{
1512 struct serial_state *info = container_of(port, struct serial_state,
1513 tport);
1514 unsigned long flags;
1515
1516 if (raise)
1517 info->MCR |= SER_DTR|SER_RTS;
1518 else
1519 info->MCR &= ~(SER_DTR|SER_RTS);
1520
1521 local_irq_save(flags);
1522 rtsdtr_ctrl(info->MCR);
1523 local_irq_restore(flags);
1524}
1525
1526static const struct tty_port_operations amiga_port_ops = {
1527 .carrier_raised = amiga_carrier_raised,
1528 .dtr_rts = amiga_dtr_rts,
1529};
1530
1531/*
1532 * The serial driver boot-time initialization code!
1533 */
1534static int __init amiga_serial_probe(struct platform_device *pdev)
1535{
1536 unsigned long flags;
1537 struct serial_state * state;
1538 int error;
1539
1540 serial_driver = alloc_tty_driver(NR_PORTS);
1541 if (!serial_driver)
1542 return -ENOMEM;
1543
1544 show_serial_version();
1545
1546 /* Initialize the tty_driver structure */
1547
1548 serial_driver->driver_name = "amiserial";
1549 serial_driver->name = "ttyS";
1550 serial_driver->major = TTY_MAJOR;
1551 serial_driver->minor_start = 64;
1552 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1553 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1554 serial_driver->init_termios = tty_std_termios;
1555 serial_driver->init_termios.c_cflag =
1556 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1557 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1558 tty_set_operations(serial_driver, &serial_ops);
1559
1560 state = rs_table;
1561 state->port = (int)&custom.serdatr; /* Just to give it a value */
1562 state->custom_divisor = 0;
1563 state->icount.cts = state->icount.dsr =
1564 state->icount.rng = state->icount.dcd = 0;
1565 state->icount.rx = state->icount.tx = 0;
1566 state->icount.frame = state->icount.parity = 0;
1567 state->icount.overrun = state->icount.brk = 0;
1568 tty_port_init(&state->tport);
1569 state->tport.ops = &amiga_port_ops;
1570 tty_port_link_device(&state->tport, serial_driver, 0);
1571
1572 error = tty_register_driver(serial_driver);
1573 if (error)
1574 goto fail_put_tty_driver;
1575
1576 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1577
1578 /* Hardware set up */
1579
1580 state->baud_base = amiga_colorclock;
1581 state->xmit_fifo_size = 1;
1582
1583 /* set ISRs, and then disable the rx interrupts */
1584 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1585 if (error)
1586 goto fail_unregister;
1587
1588 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1589 "serial RX", state);
1590 if (error)
1591 goto fail_free_irq;
1592
1593 local_irq_save(flags);
1594
1595 /* turn off Rx and Tx interrupts */
1596 custom.intena = IF_RBF | IF_TBE;
1597 mb();
1598
1599 /* clear any pending interrupt */
1600 custom.intreq = IF_RBF | IF_TBE;
1601 mb();
1602
1603 local_irq_restore(flags);
1604
1605 /*
1606 * set the appropriate directions for the modem control flags,
1607 * and clear RTS and DTR
1608 */
1609 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1610 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1611
1612 platform_set_drvdata(pdev, state);
1613
1614 return 0;
1615
1616fail_free_irq:
1617 free_irq(IRQ_AMIGA_TBE, state);
1618fail_unregister:
1619 tty_unregister_driver(serial_driver);
1620fail_put_tty_driver:
1621 tty_port_destroy(&state->tport);
1622 put_tty_driver(serial_driver);
1623 return error;
1624}
1625
1626static int __exit amiga_serial_remove(struct platform_device *pdev)
1627{
1628 int error;
1629 struct serial_state *state = platform_get_drvdata(pdev);
1630
1631 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1632 error = tty_unregister_driver(serial_driver);
1633 if (error)
1634 printk("SERIAL: failed to unregister serial driver (%d)\n",
1635 error);
1636 put_tty_driver(serial_driver);
1637 tty_port_destroy(&state->tport);
1638
1639 free_irq(IRQ_AMIGA_TBE, state);
1640 free_irq(IRQ_AMIGA_RBF, state);
1641
1642 return error;
1643}
1644
1645static struct platform_driver amiga_serial_driver = {
1646 .remove = __exit_p(amiga_serial_remove),
1647 .driver = {
1648 .name = "amiga-serial",
1649 },
1650};
1651
1652module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1653
1654
1655#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1656
1657/*
1658 * ------------------------------------------------------------
1659 * Serial console driver
1660 * ------------------------------------------------------------
1661 */
1662
1663static void amiga_serial_putc(char c)
1664{
1665 custom.serdat = (unsigned char)c | 0x100;
1666 while (!(custom.serdatr & 0x2000))
1667 barrier();
1668}
1669
1670/*
1671 * Print a string to the serial port trying not to disturb
1672 * any possible real use of the port...
1673 *
1674 * The console must be locked when we get here.
1675 */
1676static void serial_console_write(struct console *co, const char *s,
1677 unsigned count)
1678{
1679 unsigned short intena = custom.intenar;
1680
1681 custom.intena = IF_TBE;
1682
1683 while (count--) {
1684 if (*s == '\n')
1685 amiga_serial_putc('\r');
1686 amiga_serial_putc(*s++);
1687 }
1688
1689 custom.intena = IF_SETCLR | (intena & IF_TBE);
1690}
1691
1692static struct tty_driver *serial_console_device(struct console *c, int *index)
1693{
1694 *index = 0;
1695 return serial_driver;
1696}
1697
1698static struct console sercons = {
1699 .name = "ttyS",
1700 .write = serial_console_write,
1701 .device = serial_console_device,
1702 .flags = CON_PRINTBUFFER,
1703 .index = -1,
1704};
1705
1706/*
1707 * Register console.
1708 */
1709static int __init amiserial_console_init(void)
1710{
1711 if (!MACH_IS_AMIGA)
1712 return -ENODEV;
1713
1714 register_console(&sercons);
1715 return 0;
1716}
1717console_initcall(amiserial_console_init);
1718
1719#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1720
1721MODULE_LICENSE("GPL");
1722MODULE_ALIAS("platform:amiga-serial");