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
rs_startup(struct tty_struct * tty,struct serial_state * info)441 static int rs_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 void *buffer;
447
448 buffer = kzalloc(PAGE_SIZE, GFP_KERNEL);
449 if (!buffer)
450 return -ENOMEM;
451
452 local_irq_save(flags);
453
454 if (tty_port_initialized(port)) {
455 kfree(buffer);
456 goto errout;
457 }
458
459 if (info->xmit.buf)
460 kfree(buffer);
461 else
462 info->xmit.buf = buffer;
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 */
rs_shutdown(struct tty_struct * tty,struct serial_state * info)516 static void rs_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 kfree(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 = rs_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 ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1142 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1143 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1144 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1145 ret = 0;
1146 break;
1147 }
1148 if (tty_io_error(tty)) {
1149 ret = -EIO;
1150 break;
1151 }
1152 schedule();
1153 /* see if a signal did it */
1154 if (signal_pending(current)) {
1155 ret = -ERESTARTSYS;
1156 break;
1157 }
1158 cprev = cnow;
1159 }
1160 finish_wait(&info->tport.delta_msr_wait, &wait);
1161 return ret;
1162
1163 default:
1164 return -ENOIOCTLCMD;
1165 }
1166 return 0;
1167 }
1168
rs_set_termios(struct tty_struct * tty,const struct ktermios * old_termios)1169 static void rs_set_termios(struct tty_struct *tty, const struct ktermios *old_termios)
1170 {
1171 struct serial_state *info = tty->driver_data;
1172 unsigned long flags;
1173 unsigned int cflag = tty->termios.c_cflag;
1174
1175 change_speed(tty, info, old_termios);
1176
1177 /* Handle transition to B0 status */
1178 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1179 info->MCR &= ~(SER_DTR|SER_RTS);
1180 local_irq_save(flags);
1181 rtsdtr_ctrl(info->MCR);
1182 local_irq_restore(flags);
1183 }
1184
1185 /* Handle transition away from B0 status */
1186 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1187 info->MCR |= SER_DTR;
1188 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1189 info->MCR |= SER_RTS;
1190 local_irq_save(flags);
1191 rtsdtr_ctrl(info->MCR);
1192 local_irq_restore(flags);
1193 }
1194
1195 /* Handle turning off CRTSCTS */
1196 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1197 tty->hw_stopped = false;
1198 rs_start(tty);
1199 }
1200
1201 #if 0
1202 /*
1203 * No need to wake up processes in open wait, since they
1204 * sample the CLOCAL flag once, and don't recheck it.
1205 * XXX It's not clear whether the current behavior is correct
1206 * or not. Hence, this may change.....
1207 */
1208 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1209 wake_up_interruptible(&info->open_wait);
1210 #endif
1211 }
1212
1213 /*
1214 * ------------------------------------------------------------
1215 * rs_close()
1216 *
1217 * This routine is called when the serial port gets closed. First, we
1218 * wait for the last remaining data to be sent. Then, we unlink its
1219 * async structure from the interrupt chain if necessary, and we free
1220 * that IRQ if nothing is left in the chain.
1221 * ------------------------------------------------------------
1222 */
rs_close(struct tty_struct * tty,struct file * filp)1223 static void rs_close(struct tty_struct *tty, struct file * filp)
1224 {
1225 struct serial_state *state = tty->driver_data;
1226 struct tty_port *port = &state->tport;
1227
1228 if (tty_port_close_start(port, tty, filp) == 0)
1229 return;
1230
1231 /*
1232 * At this point we stop accepting input. To do this, we
1233 * disable the receive line status interrupts, and tell the
1234 * interrupt driver to stop checking the data ready bit in the
1235 * line status register.
1236 */
1237 state->read_status_mask &= ~UART_LSR_DR;
1238 if (tty_port_initialized(port)) {
1239 /* disable receive interrupts */
1240 amiga_custom.intena = IF_RBF;
1241 mb();
1242 /* clear any pending receive interrupt */
1243 amiga_custom.intreq = IF_RBF;
1244 mb();
1245
1246 /*
1247 * Before we drop DTR, make sure the UART transmitter
1248 * has completely drained; this is especially
1249 * important if there is a transmit FIFO!
1250 */
1251 rs_wait_until_sent(tty, state->timeout);
1252 }
1253 rs_shutdown(tty, state);
1254 rs_flush_buffer(tty);
1255
1256 tty_ldisc_flush(tty);
1257 port->tty = NULL;
1258
1259 tty_port_close_end(port, tty);
1260 }
1261
1262 /*
1263 * rs_wait_until_sent() --- wait until the transmitter is empty
1264 */
rs_wait_until_sent(struct tty_struct * tty,int timeout)1265 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1266 {
1267 struct serial_state *info = tty->driver_data;
1268 unsigned long orig_jiffies, char_time;
1269 int lsr;
1270
1271 orig_jiffies = jiffies;
1272
1273 /*
1274 * Set the check interval to be 1/5 of the estimated time to
1275 * send a single character, and make it at least 1. The check
1276 * interval should also be less than the timeout.
1277 *
1278 * Note: we have to use pretty tight timings here to satisfy
1279 * the NIST-PCTS.
1280 */
1281 char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE;
1282 char_time = char_time / 5;
1283 if (char_time == 0)
1284 char_time = 1;
1285 if (timeout)
1286 char_time = min_t(unsigned long, char_time, timeout);
1287 /*
1288 * If the transmitter hasn't cleared in twice the approximate
1289 * amount of time to send the entire FIFO, it probably won't
1290 * ever clear. This assumes the UART isn't doing flow
1291 * control, which is currently the case. Hence, if it ever
1292 * takes longer than info->timeout, this is probably due to a
1293 * UART bug of some kind. So, we clamp the timeout parameter at
1294 * 2*info->timeout.
1295 */
1296 if (!timeout || timeout > 2*info->timeout)
1297 timeout = 2*info->timeout;
1298 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1299 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1300 printk("jiff=%lu...", jiffies);
1301 #endif
1302 while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) {
1303 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1304 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1305 #endif
1306 msleep_interruptible(jiffies_to_msecs(char_time));
1307 if (signal_pending(current))
1308 break;
1309 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1310 break;
1311 }
1312 __set_current_state(TASK_RUNNING);
1313
1314 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1315 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1316 #endif
1317 }
1318
1319 /*
1320 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1321 */
rs_hangup(struct tty_struct * tty)1322 static void rs_hangup(struct tty_struct *tty)
1323 {
1324 struct serial_state *info = tty->driver_data;
1325
1326 rs_flush_buffer(tty);
1327 rs_shutdown(tty, info);
1328 info->tport.count = 0;
1329 tty_port_set_active(&info->tport, false);
1330 info->tport.tty = NULL;
1331 wake_up_interruptible(&info->tport.open_wait);
1332 }
1333
1334 /*
1335 * This routine is called whenever a serial port is opened. It
1336 * enables interrupts for a serial port, linking in its async structure into
1337 * the IRQ chain. It also performs the serial-specific
1338 * initialization for the tty structure.
1339 */
rs_open(struct tty_struct * tty,struct file * filp)1340 static int rs_open(struct tty_struct *tty, struct file * filp)
1341 {
1342 struct tty_port *port = tty->port;
1343 struct serial_state *info = container_of(port, struct serial_state,
1344 tport);
1345 int retval;
1346
1347 port->count++;
1348 port->tty = tty;
1349 tty->driver_data = info;
1350
1351 retval = rs_startup(tty, info);
1352 if (retval) {
1353 return retval;
1354 }
1355
1356 return tty_port_block_til_ready(port, tty, filp);
1357 }
1358
1359 /*
1360 * /proc fs routines....
1361 */
1362
line_info(struct seq_file * m,int line,struct serial_state * state)1363 static inline void line_info(struct seq_file *m, int line,
1364 struct serial_state *state)
1365 {
1366 char stat_buf[30], control, status;
1367 unsigned long flags;
1368
1369 seq_printf(m, "%d: uart:amiga_builtin", line);
1370
1371 local_irq_save(flags);
1372 status = ciab.pra;
1373 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1374 local_irq_restore(flags);
1375
1376 stat_buf[0] = 0;
1377 stat_buf[1] = 0;
1378 if(!(control & SER_RTS))
1379 strcat(stat_buf, "|RTS");
1380 if(!(status & SER_CTS))
1381 strcat(stat_buf, "|CTS");
1382 if(!(control & SER_DTR))
1383 strcat(stat_buf, "|DTR");
1384 if(!(status & SER_DSR))
1385 strcat(stat_buf, "|DSR");
1386 if(!(status & SER_DCD))
1387 strcat(stat_buf, "|CD");
1388
1389 if (state->quot)
1390 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1391
1392 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1393
1394 if (state->icount.frame)
1395 seq_printf(m, " fe:%d", state->icount.frame);
1396
1397 if (state->icount.parity)
1398 seq_printf(m, " pe:%d", state->icount.parity);
1399
1400 if (state->icount.brk)
1401 seq_printf(m, " brk:%d", state->icount.brk);
1402
1403 if (state->icount.overrun)
1404 seq_printf(m, " oe:%d", state->icount.overrun);
1405
1406 /*
1407 * Last thing is the RS-232 status lines
1408 */
1409 seq_printf(m, " %s\n", stat_buf+1);
1410 }
1411
rs_proc_show(struct seq_file * m,void * v)1412 static int rs_proc_show(struct seq_file *m, void *v)
1413 {
1414 seq_printf(m, "serinfo:1.0 driver:4.30\n");
1415 line_info(m, 0, &serial_state);
1416 return 0;
1417 }
1418
1419 /*
1420 * ---------------------------------------------------------------------
1421 * rs_init() and friends
1422 *
1423 * rs_init() is called at boot-time to initialize the serial driver.
1424 * ---------------------------------------------------------------------
1425 */
1426
1427 static const struct tty_operations serial_ops = {
1428 .open = rs_open,
1429 .close = rs_close,
1430 .write = rs_write,
1431 .put_char = rs_put_char,
1432 .flush_chars = rs_flush_chars,
1433 .write_room = rs_write_room,
1434 .chars_in_buffer = rs_chars_in_buffer,
1435 .flush_buffer = rs_flush_buffer,
1436 .ioctl = rs_ioctl,
1437 .throttle = rs_throttle,
1438 .unthrottle = rs_unthrottle,
1439 .set_termios = rs_set_termios,
1440 .stop = rs_stop,
1441 .start = rs_start,
1442 .hangup = rs_hangup,
1443 .break_ctl = rs_break,
1444 .send_xchar = rs_send_xchar,
1445 .wait_until_sent = rs_wait_until_sent,
1446 .tiocmget = rs_tiocmget,
1447 .tiocmset = rs_tiocmset,
1448 .get_icount = rs_get_icount,
1449 .set_serial = set_serial_info,
1450 .get_serial = get_serial_info,
1451 .proc_show = rs_proc_show,
1452 };
1453
amiga_carrier_raised(struct tty_port * port)1454 static bool amiga_carrier_raised(struct tty_port *port)
1455 {
1456 return !(ciab.pra & SER_DCD);
1457 }
1458
amiga_dtr_rts(struct tty_port * port,bool active)1459 static void amiga_dtr_rts(struct tty_port *port, bool active)
1460 {
1461 struct serial_state *info = container_of(port, struct serial_state,
1462 tport);
1463 unsigned long flags;
1464
1465 if (active)
1466 info->MCR |= SER_DTR|SER_RTS;
1467 else
1468 info->MCR &= ~(SER_DTR|SER_RTS);
1469
1470 local_irq_save(flags);
1471 rtsdtr_ctrl(info->MCR);
1472 local_irq_restore(flags);
1473 }
1474
1475 static const struct tty_port_operations amiga_port_ops = {
1476 .carrier_raised = amiga_carrier_raised,
1477 .dtr_rts = amiga_dtr_rts,
1478 };
1479
1480 /*
1481 * The serial driver boot-time initialization code!
1482 */
amiga_serial_probe(struct platform_device * pdev)1483 static int __init amiga_serial_probe(struct platform_device *pdev)
1484 {
1485 struct serial_state *state = &serial_state;
1486 struct tty_driver *driver;
1487 unsigned long flags;
1488 int error;
1489
1490 driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
1491 if (IS_ERR(driver))
1492 return PTR_ERR(driver);
1493
1494 /* Initialize the tty_driver structure */
1495
1496 driver->driver_name = "amiserial";
1497 driver->name = "ttyS";
1498 driver->major = TTY_MAJOR;
1499 driver->minor_start = 64;
1500 driver->type = TTY_DRIVER_TYPE_SERIAL;
1501 driver->subtype = SERIAL_TYPE_NORMAL;
1502 driver->init_termios = tty_std_termios;
1503 driver->init_termios.c_cflag =
1504 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1505 tty_set_operations(driver, &serial_ops);
1506
1507 memset(state, 0, sizeof(*state));
1508 state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
1509 tty_port_init(&state->tport);
1510 state->tport.ops = &amiga_port_ops;
1511 tty_port_link_device(&state->tport, driver, 0);
1512
1513 error = tty_register_driver(driver);
1514 if (error)
1515 goto fail_tty_driver_kref_put;
1516
1517 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1518
1519 /* Hardware set up */
1520
1521 state->baud_base = amiga_colorclock;
1522
1523 /* set ISRs, and then disable the rx interrupts */
1524 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1525 if (error)
1526 goto fail_unregister;
1527
1528 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1529 "serial RX", state);
1530 if (error)
1531 goto fail_free_irq;
1532
1533 local_irq_save(flags);
1534
1535 /* turn off Rx and Tx interrupts */
1536 amiga_custom.intena = IF_RBF | IF_TBE;
1537 mb();
1538
1539 /* clear any pending interrupt */
1540 amiga_custom.intreq = IF_RBF | IF_TBE;
1541 mb();
1542
1543 local_irq_restore(flags);
1544
1545 /*
1546 * set the appropriate directions for the modem control flags,
1547 * and clear RTS and DTR
1548 */
1549 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1550 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1551
1552 platform_set_drvdata(pdev, state);
1553
1554 serial_driver = driver;
1555
1556 return 0;
1557
1558 fail_free_irq:
1559 free_irq(IRQ_AMIGA_TBE, state);
1560 fail_unregister:
1561 tty_unregister_driver(driver);
1562 fail_tty_driver_kref_put:
1563 tty_port_destroy(&state->tport);
1564 tty_driver_kref_put(driver);
1565 return error;
1566 }
1567
amiga_serial_remove(struct platform_device * pdev)1568 static void __exit amiga_serial_remove(struct platform_device *pdev)
1569 {
1570 struct serial_state *state = platform_get_drvdata(pdev);
1571
1572 tty_unregister_driver(serial_driver);
1573 tty_driver_kref_put(serial_driver);
1574 tty_port_destroy(&state->tport);
1575
1576 free_irq(IRQ_AMIGA_TBE, state);
1577 free_irq(IRQ_AMIGA_RBF, state);
1578 }
1579
1580 /*
1581 * amiga_serial_remove() lives in .exit.text. For drivers registered via
1582 * module_platform_driver_probe() this is ok because they cannot get unbound at
1583 * runtime. So mark the driver struct with __refdata to prevent modpost
1584 * triggering a section mismatch warning.
1585 */
1586 static struct platform_driver amiga_serial_driver __refdata = {
1587 .remove = __exit_p(amiga_serial_remove),
1588 .driver = {
1589 .name = "amiga-serial",
1590 },
1591 };
1592
1593 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1594
1595
1596 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1597
1598 /*
1599 * ------------------------------------------------------------
1600 * Serial console driver
1601 * ------------------------------------------------------------
1602 */
1603
amiga_serial_putc(char c)1604 static void amiga_serial_putc(char c)
1605 {
1606 amiga_custom.serdat = (unsigned char)c | 0x100;
1607 while (!(amiga_custom.serdatr & 0x2000))
1608 barrier();
1609 }
1610
1611 /*
1612 * Print a string to the serial port trying not to disturb
1613 * any possible real use of the port...
1614 *
1615 * The console must be locked when we get here.
1616 */
serial_console_write(struct console * co,const char * s,unsigned count)1617 static void serial_console_write(struct console *co, const char *s,
1618 unsigned count)
1619 {
1620 unsigned short intena = amiga_custom.intenar;
1621
1622 amiga_custom.intena = IF_TBE;
1623
1624 while (count--) {
1625 if (*s == '\n')
1626 amiga_serial_putc('\r');
1627 amiga_serial_putc(*s++);
1628 }
1629
1630 amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
1631 }
1632
serial_console_device(struct console * c,int * index)1633 static struct tty_driver *serial_console_device(struct console *c, int *index)
1634 {
1635 *index = 0;
1636 return serial_driver;
1637 }
1638
1639 static struct console sercons = {
1640 .name = "ttyS",
1641 .write = serial_console_write,
1642 .device = serial_console_device,
1643 .flags = CON_PRINTBUFFER,
1644 .index = -1,
1645 };
1646
1647 /*
1648 * Register console.
1649 */
amiserial_console_init(void)1650 static int __init amiserial_console_init(void)
1651 {
1652 if (!MACH_IS_AMIGA)
1653 return -ENODEV;
1654
1655 register_console(&sercons);
1656 return 0;
1657 }
1658 console_initcall(amiserial_console_init);
1659
1660 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1661
1662 MODULE_DESCRIPTION("Serial driver for the amiga builtin port");
1663 MODULE_LICENSE("GPL");
1664 MODULE_ALIAS("platform:amiga-serial");
1665