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 u8 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 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
transmit_chars(struct serial_state * info)263 static 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
check_modem_status(struct serial_state * info)303 static 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
ser_vbl_int(int irq,void * data)375 static 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
ser_rx_int(int irq,void * dev_id)388 static 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
ser_tx_int(int irq,void * dev_id)406 static 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
startup(struct tty_struct * tty,struct serial_state * info)441 static 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
507 errout:
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 */
shutdown(struct tty_struct * tty,struct serial_state * info)516 static 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 */
change_speed(struct tty_struct * tty,struct serial_state * info,const struct ktermios * old_termios)566 static 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
rs_put_char(struct tty_struct * tty,u8 ch)697 static 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
rs_flush_chars(struct tty_struct * tty)721 static 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
rs_write(struct tty_struct * tty,const u8 * buf,size_t count)742 static 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
rs_write_room(struct tty_struct * tty)785 static 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
rs_chars_in_buffer(struct tty_struct * tty)792 static 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
rs_flush_buffer(struct tty_struct * tty)799 static 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 */
rs_send_xchar(struct tty_struct * tty,u8 ch)814 static 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 */
rs_throttle(struct tty_struct * tty)846 static 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
rs_unthrottle(struct tty_struct * tty)865 static 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
get_serial_info(struct tty_struct * tty,struct serial_struct * ss)892 static 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
set_serial_info(struct tty_struct * tty,struct serial_struct * ss)915 static 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
969 check_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 */
get_lsr_info(struct serial_state * info,unsigned int __user * value)993 static 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
rs_tiocmget(struct tty_struct * tty)1010 static 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
rs_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1030 static 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 */
rs_break(struct tty_struct * tty,int break_state)1056 static 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 */
rs_get_icount(struct tty_struct * tty,struct serial_icounter_struct * icount)1076 static 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
rs_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1101 static 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
rs_set_termios(struct tty_struct * tty,const struct ktermios * old_termios)1170 static 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 */
rs_close(struct tty_struct * tty,struct file * filp)1224 static 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 */
rs_wait_until_sent(struct tty_struct * tty,int timeout)1266 static 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 */
rs_hangup(struct tty_struct * tty)1323 static 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 */
rs_open(struct tty_struct * tty,struct file * filp)1341 static 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
line_info(struct seq_file * m,int line,struct serial_state * state)1364 static 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
rs_proc_show(struct seq_file * m,void * v)1413 static 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
1428 static 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
amiga_carrier_raised(struct tty_port * port)1455 static bool amiga_carrier_raised(struct tty_port *port)
1456 {
1457 return !(ciab.pra & SER_DCD);
1458 }
1459
amiga_dtr_rts(struct tty_port * port,bool active)1460 static 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
1476 static 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 */
amiga_serial_probe(struct platform_device * pdev)1484 static 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
1559 fail_free_irq:
1560 free_irq(IRQ_AMIGA_TBE, state);
1561 fail_unregister:
1562 tty_unregister_driver(driver);
1563 fail_tty_driver_kref_put:
1564 tty_port_destroy(&state->tport);
1565 tty_driver_kref_put(driver);
1566 return error;
1567 }
1568
amiga_serial_remove(struct platform_device * pdev)1569 static void __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
1581 /*
1582 * amiga_serial_remove() lives in .exit.text. For drivers registered via
1583 * module_platform_driver_probe() this is ok because they cannot get unbound at
1584 * runtime. So mark the driver struct with __refdata to prevent modpost
1585 * triggering a section mismatch warning.
1586 */
1587 static struct platform_driver amiga_serial_driver __refdata = {
1588 .remove = __exit_p(amiga_serial_remove),
1589 .driver = {
1590 .name = "amiga-serial",
1591 },
1592 };
1593
1594 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1595
1596
1597 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1598
1599 /*
1600 * ------------------------------------------------------------
1601 * Serial console driver
1602 * ------------------------------------------------------------
1603 */
1604
amiga_serial_putc(char c)1605 static void amiga_serial_putc(char c)
1606 {
1607 amiga_custom.serdat = (unsigned char)c | 0x100;
1608 while (!(amiga_custom.serdatr & 0x2000))
1609 barrier();
1610 }
1611
1612 /*
1613 * Print a string to the serial port trying not to disturb
1614 * any possible real use of the port...
1615 *
1616 * The console must be locked when we get here.
1617 */
serial_console_write(struct console * co,const char * s,unsigned count)1618 static void serial_console_write(struct console *co, const char *s,
1619 unsigned count)
1620 {
1621 unsigned short intena = amiga_custom.intenar;
1622
1623 amiga_custom.intena = IF_TBE;
1624
1625 while (count--) {
1626 if (*s == '\n')
1627 amiga_serial_putc('\r');
1628 amiga_serial_putc(*s++);
1629 }
1630
1631 amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
1632 }
1633
serial_console_device(struct console * c,int * index)1634 static struct tty_driver *serial_console_device(struct console *c, int *index)
1635 {
1636 *index = 0;
1637 return serial_driver;
1638 }
1639
1640 static struct console sercons = {
1641 .name = "ttyS",
1642 .write = serial_console_write,
1643 .device = serial_console_device,
1644 .flags = CON_PRINTBUFFER,
1645 .index = -1,
1646 };
1647
1648 /*
1649 * Register console.
1650 */
amiserial_console_init(void)1651 static int __init amiserial_console_init(void)
1652 {
1653 if (!MACH_IS_AMIGA)
1654 return -ENODEV;
1655
1656 register_console(&sercons);
1657 return 0;
1658 }
1659 console_initcall(amiserial_console_init);
1660
1661 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1662
1663 MODULE_DESCRIPTION("Serial driver for the amiga builtin port");
1664 MODULE_LICENSE("GPL");
1665 MODULE_ALIAS("platform:amiga-serial");
1666