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