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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * dz.c: Serial port driver for DECstations equipped
4 * with the DZ chipset.
5 *
6 * Copyright (C) 1998 Olivier A. D. Lebaillif
7 *
8 * Email: olivier.lebaillif@ifrsys.com
9 *
10 * Copyright (C) 2004, 2006, 2007 Maciej W. Rozycki
11 *
12 * [31-AUG-98] triemer
13 * Changed IRQ to use Harald's dec internals interrupts.h
14 * removed base_addr code - moving address assignment to setup.c
15 * Changed name of dz_init to rs_init to be consistent with tc code
16 * [13-NOV-98] triemer fixed code to receive characters
17 * after patches by harald to irq code.
18 * [09-JAN-99] triemer minor fix for schedule - due to removal of timeout
19 * field from "current" - somewhere between 2.1.121 and 2.1.131
20 Qua Jun 27 15:02:26 BRT 2001
21 * [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups
22 *
23 * Parts (C) 1999 David Airlie, airlied@linux.ie
24 * [07-SEP-99] Bugfixes
25 *
26 * [06-Jan-2002] Russell King <rmk@arm.linux.org.uk>
27 * Converted to new serial core
28 */
29
30#undef DEBUG_DZ
31
32#if defined(CONFIG_SERIAL_DZ_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
33#define SUPPORT_SYSRQ
34#endif
35
36#include <linux/bitops.h>
37#include <linux/compiler.h>
38#include <linux/console.h>
39#include <linux/delay.h>
40#include <linux/errno.h>
41#include <linux/init.h>
42#include <linux/interrupt.h>
43#include <linux/ioport.h>
44#include <linux/kernel.h>
45#include <linux/major.h>
46#include <linux/module.h>
47#include <linux/serial.h>
48#include <linux/serial_core.h>
49#include <linux/sysrq.h>
50#include <linux/tty.h>
51#include <linux/tty_flip.h>
52
53#include <linux/atomic.h>
54#include <asm/bootinfo.h>
55#include <asm/io.h>
56
57#include <asm/dec/interrupts.h>
58#include <asm/dec/kn01.h>
59#include <asm/dec/kn02.h>
60#include <asm/dec/machtype.h>
61#include <asm/dec/prom.h>
62#include <asm/dec/system.h>
63
64#include "dz.h"
65
66
67MODULE_DESCRIPTION("DECstation DZ serial driver");
68MODULE_LICENSE("GPL");
69
70
71static char dz_name[] __initdata = "DECstation DZ serial driver version ";
72static char dz_version[] __initdata = "1.04";
73
74struct dz_port {
75 struct dz_mux *mux;
76 struct uart_port port;
77 unsigned int cflag;
78};
79
80struct dz_mux {
81 struct dz_port dport[DZ_NB_PORT];
82 atomic_t map_guard;
83 atomic_t irq_guard;
84 int initialised;
85};
86
87static struct dz_mux dz_mux;
88
89static inline struct dz_port *to_dport(struct uart_port *uport)
90{
91 return container_of(uport, struct dz_port, port);
92}
93
94/*
95 * ------------------------------------------------------------
96 * dz_in () and dz_out ()
97 *
98 * These routines are used to access the registers of the DZ
99 * chip, hiding relocation differences between implementation.
100 * ------------------------------------------------------------
101 */
102
103static u16 dz_in(struct dz_port *dport, unsigned offset)
104{
105 void __iomem *addr = dport->port.membase + offset;
106
107 return readw(addr);
108}
109
110static void dz_out(struct dz_port *dport, unsigned offset, u16 value)
111{
112 void __iomem *addr = dport->port.membase + offset;
113
114 writew(value, addr);
115}
116
117/*
118 * ------------------------------------------------------------
119 * rs_stop () and rs_start ()
120 *
121 * These routines are called before setting or resetting
122 * tty->stopped. They enable or disable transmitter interrupts,
123 * as necessary.
124 * ------------------------------------------------------------
125 */
126
127static void dz_stop_tx(struct uart_port *uport)
128{
129 struct dz_port *dport = to_dport(uport);
130 u16 tmp, mask = 1 << dport->port.line;
131
132 tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
133 tmp &= ~mask; /* clear the TX flag */
134 dz_out(dport, DZ_TCR, tmp);
135}
136
137static void dz_start_tx(struct uart_port *uport)
138{
139 struct dz_port *dport = to_dport(uport);
140 u16 tmp, mask = 1 << dport->port.line;
141
142 tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
143 tmp |= mask; /* set the TX flag */
144 dz_out(dport, DZ_TCR, tmp);
145}
146
147static void dz_stop_rx(struct uart_port *uport)
148{
149 struct dz_port *dport = to_dport(uport);
150
151 dport->cflag &= ~DZ_RXENAB;
152 dz_out(dport, DZ_LPR, dport->cflag);
153}
154
155/*
156 * ------------------------------------------------------------
157 *
158 * Here start the interrupt handling routines. All of the following
159 * subroutines are declared as inline and are folded into
160 * dz_interrupt. They were separated out for readability's sake.
161 *
162 * Note: dz_interrupt() is a "fast" interrupt, which means that it
163 * runs with interrupts turned off. People who may want to modify
164 * dz_interrupt() should try to keep the interrupt handler as fast as
165 * possible. After you are done making modifications, it is not a bad
166 * idea to do:
167 *
168 * make drivers/serial/dz.s
169 *
170 * and look at the resulting assemble code in dz.s.
171 *
172 * ------------------------------------------------------------
173 */
174
175/*
176 * ------------------------------------------------------------
177 * receive_char ()
178 *
179 * This routine deals with inputs from any lines.
180 * ------------------------------------------------------------
181 */
182static inline void dz_receive_chars(struct dz_mux *mux)
183{
184 struct uart_port *uport;
185 struct dz_port *dport = &mux->dport[0];
186 struct uart_icount *icount;
187 int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 };
188 unsigned char ch, flag;
189 u16 status;
190 int i;
191
192 while ((status = dz_in(dport, DZ_RBUF)) & DZ_DVAL) {
193 dport = &mux->dport[LINE(status)];
194 uport = &dport->port;
195
196 ch = UCHAR(status); /* grab the char */
197 flag = TTY_NORMAL;
198
199 icount = &uport->icount;
200 icount->rx++;
201
202 if (unlikely(status & (DZ_OERR | DZ_FERR | DZ_PERR))) {
203
204 /*
205 * There is no separate BREAK status bit, so treat
206 * null characters with framing errors as BREAKs;
207 * normally, otherwise. For this move the Framing
208 * Error bit to a simulated BREAK bit.
209 */
210 if (!ch) {
211 status |= (status & DZ_FERR) >>
212 (ffs(DZ_FERR) - ffs(DZ_BREAK));
213 status &= ~DZ_FERR;
214 }
215
216 /* Handle SysRq/SAK & keep track of the statistics. */
217 if (status & DZ_BREAK) {
218 icount->brk++;
219 if (uart_handle_break(uport))
220 continue;
221 } else if (status & DZ_FERR)
222 icount->frame++;
223 else if (status & DZ_PERR)
224 icount->parity++;
225 if (status & DZ_OERR)
226 icount->overrun++;
227
228 status &= uport->read_status_mask;
229 if (status & DZ_BREAK)
230 flag = TTY_BREAK;
231 else if (status & DZ_FERR)
232 flag = TTY_FRAME;
233 else if (status & DZ_PERR)
234 flag = TTY_PARITY;
235
236 }
237
238 if (uart_handle_sysrq_char(uport, ch))
239 continue;
240
241 uart_insert_char(uport, status, DZ_OERR, ch, flag);
242 lines_rx[LINE(status)] = 1;
243 }
244 for (i = 0; i < DZ_NB_PORT; i++)
245 if (lines_rx[i])
246 tty_flip_buffer_push(&mux->dport[i].port.state->port);
247}
248
249/*
250 * ------------------------------------------------------------
251 * transmit_char ()
252 *
253 * This routine deals with outputs to any lines.
254 * ------------------------------------------------------------
255 */
256static inline void dz_transmit_chars(struct dz_mux *mux)
257{
258 struct dz_port *dport = &mux->dport[0];
259 struct circ_buf *xmit;
260 unsigned char tmp;
261 u16 status;
262
263 status = dz_in(dport, DZ_CSR);
264 dport = &mux->dport[LINE(status)];
265 xmit = &dport->port.state->xmit;
266
267 if (dport->port.x_char) { /* XON/XOFF chars */
268 dz_out(dport, DZ_TDR, dport->port.x_char);
269 dport->port.icount.tx++;
270 dport->port.x_char = 0;
271 return;
272 }
273 /* If nothing to do or stopped or hardware stopped. */
274 if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
275 spin_lock(&dport->port.lock);
276 dz_stop_tx(&dport->port);
277 spin_unlock(&dport->port.lock);
278 return;
279 }
280
281 /*
282 * If something to do... (remember the dz has no output fifo,
283 * so we go one char at a time) :-<
284 */
285 tmp = xmit->buf[xmit->tail];
286 xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
287 dz_out(dport, DZ_TDR, tmp);
288 dport->port.icount.tx++;
289
290 if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
291 uart_write_wakeup(&dport->port);
292
293 /* Are we are done. */
294 if (uart_circ_empty(xmit)) {
295 spin_lock(&dport->port.lock);
296 dz_stop_tx(&dport->port);
297 spin_unlock(&dport->port.lock);
298 }
299}
300
301/*
302 * ------------------------------------------------------------
303 * check_modem_status()
304 *
305 * DS 3100 & 5100: Only valid for the MODEM line, duh!
306 * DS 5000/200: Valid for the MODEM and PRINTER line.
307 * ------------------------------------------------------------
308 */
309static inline void check_modem_status(struct dz_port *dport)
310{
311 /*
312 * FIXME:
313 * 1. No status change interrupt; use a timer.
314 * 2. Handle the 3100/5000 as appropriate. --macro
315 */
316 u16 status;
317
318 /* If not the modem line just return. */
319 if (dport->port.line != DZ_MODEM)
320 return;
321
322 status = dz_in(dport, DZ_MSR);
323
324 /* it's easy, since DSR2 is the only bit in the register */
325 if (status)
326 dport->port.icount.dsr++;
327}
328
329/*
330 * ------------------------------------------------------------
331 * dz_interrupt ()
332 *
333 * this is the main interrupt routine for the DZ chip.
334 * It deals with the multiple ports.
335 * ------------------------------------------------------------
336 */
337static irqreturn_t dz_interrupt(int irq, void *dev_id)
338{
339 struct dz_mux *mux = dev_id;
340 struct dz_port *dport = &mux->dport[0];
341 u16 status;
342
343 /* get the reason why we just got an irq */
344 status = dz_in(dport, DZ_CSR);
345
346 if ((status & (DZ_RDONE | DZ_RIE)) == (DZ_RDONE | DZ_RIE))
347 dz_receive_chars(mux);
348
349 if ((status & (DZ_TRDY | DZ_TIE)) == (DZ_TRDY | DZ_TIE))
350 dz_transmit_chars(mux);
351
352 return IRQ_HANDLED;
353}
354
355/*
356 * -------------------------------------------------------------------
357 * Here ends the DZ interrupt routines.
358 * -------------------------------------------------------------------
359 */
360
361static unsigned int dz_get_mctrl(struct uart_port *uport)
362{
363 /*
364 * FIXME: Handle the 3100/5000 as appropriate. --macro
365 */
366 struct dz_port *dport = to_dport(uport);
367 unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
368
369 if (dport->port.line == DZ_MODEM) {
370 if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR)
371 mctrl &= ~TIOCM_DSR;
372 }
373
374 return mctrl;
375}
376
377static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
378{
379 /*
380 * FIXME: Handle the 3100/5000 as appropriate. --macro
381 */
382 struct dz_port *dport = to_dport(uport);
383 u16 tmp;
384
385 if (dport->port.line == DZ_MODEM) {
386 tmp = dz_in(dport, DZ_TCR);
387 if (mctrl & TIOCM_DTR)
388 tmp &= ~DZ_MODEM_DTR;
389 else
390 tmp |= DZ_MODEM_DTR;
391 dz_out(dport, DZ_TCR, tmp);
392 }
393}
394
395/*
396 * -------------------------------------------------------------------
397 * startup ()
398 *
399 * various initialization tasks
400 * -------------------------------------------------------------------
401 */
402static int dz_startup(struct uart_port *uport)
403{
404 struct dz_port *dport = to_dport(uport);
405 struct dz_mux *mux = dport->mux;
406 unsigned long flags;
407 int irq_guard;
408 int ret;
409 u16 tmp;
410
411 irq_guard = atomic_add_return(1, &mux->irq_guard);
412 if (irq_guard != 1)
413 return 0;
414
415 ret = request_irq(dport->port.irq, dz_interrupt,
416 IRQF_SHARED, "dz", mux);
417 if (ret) {
418 atomic_add(-1, &mux->irq_guard);
419 printk(KERN_ERR "dz: Cannot get IRQ %d!\n", dport->port.irq);
420 return ret;
421 }
422
423 spin_lock_irqsave(&dport->port.lock, flags);
424
425 /* Enable interrupts. */
426 tmp = dz_in(dport, DZ_CSR);
427 tmp |= DZ_RIE | DZ_TIE;
428 dz_out(dport, DZ_CSR, tmp);
429
430 spin_unlock_irqrestore(&dport->port.lock, flags);
431
432 return 0;
433}
434
435/*
436 * -------------------------------------------------------------------
437 * shutdown ()
438 *
439 * This routine will shutdown a serial port; interrupts are disabled, and
440 * DTR is dropped if the hangup on close termio flag is on.
441 * -------------------------------------------------------------------
442 */
443static void dz_shutdown(struct uart_port *uport)
444{
445 struct dz_port *dport = to_dport(uport);
446 struct dz_mux *mux = dport->mux;
447 unsigned long flags;
448 int irq_guard;
449 u16 tmp;
450
451 spin_lock_irqsave(&dport->port.lock, flags);
452 dz_stop_tx(&dport->port);
453 spin_unlock_irqrestore(&dport->port.lock, flags);
454
455 irq_guard = atomic_add_return(-1, &mux->irq_guard);
456 if (!irq_guard) {
457 /* Disable interrupts. */
458 tmp = dz_in(dport, DZ_CSR);
459 tmp &= ~(DZ_RIE | DZ_TIE);
460 dz_out(dport, DZ_CSR, tmp);
461
462 free_irq(dport->port.irq, mux);
463 }
464}
465
466/*
467 * -------------------------------------------------------------------
468 * dz_tx_empty() -- get the transmitter empty status
469 *
470 * Purpose: Let user call ioctl() to get info when the UART physically
471 * is emptied. On bus types like RS485, the transmitter must
472 * release the bus after transmitting. This must be done when
473 * the transmit shift register is empty, not be done when the
474 * transmit holding register is empty. This functionality
475 * allows an RS485 driver to be written in user space.
476 * -------------------------------------------------------------------
477 */
478static unsigned int dz_tx_empty(struct uart_port *uport)
479{
480 struct dz_port *dport = to_dport(uport);
481 unsigned short tmp, mask = 1 << dport->port.line;
482
483 tmp = dz_in(dport, DZ_TCR);
484 tmp &= mask;
485
486 return tmp ? 0 : TIOCSER_TEMT;
487}
488
489static void dz_break_ctl(struct uart_port *uport, int break_state)
490{
491 /*
492 * FIXME: Can't access BREAK bits in TDR easily;
493 * reuse the code for polled TX. --macro
494 */
495 struct dz_port *dport = to_dport(uport);
496 unsigned long flags;
497 unsigned short tmp, mask = 1 << dport->port.line;
498
499 spin_lock_irqsave(&uport->lock, flags);
500 tmp = dz_in(dport, DZ_TCR);
501 if (break_state)
502 tmp |= mask;
503 else
504 tmp &= ~mask;
505 dz_out(dport, DZ_TCR, tmp);
506 spin_unlock_irqrestore(&uport->lock, flags);
507}
508
509static int dz_encode_baud_rate(unsigned int baud)
510{
511 switch (baud) {
512 case 50:
513 return DZ_B50;
514 case 75:
515 return DZ_B75;
516 case 110:
517 return DZ_B110;
518 case 134:
519 return DZ_B134;
520 case 150:
521 return DZ_B150;
522 case 300:
523 return DZ_B300;
524 case 600:
525 return DZ_B600;
526 case 1200:
527 return DZ_B1200;
528 case 1800:
529 return DZ_B1800;
530 case 2000:
531 return DZ_B2000;
532 case 2400:
533 return DZ_B2400;
534 case 3600:
535 return DZ_B3600;
536 case 4800:
537 return DZ_B4800;
538 case 7200:
539 return DZ_B7200;
540 case 9600:
541 return DZ_B9600;
542 default:
543 return -1;
544 }
545}
546
547
548static void dz_reset(struct dz_port *dport)
549{
550 struct dz_mux *mux = dport->mux;
551
552 if (mux->initialised)
553 return;
554
555 dz_out(dport, DZ_CSR, DZ_CLR);
556 while (dz_in(dport, DZ_CSR) & DZ_CLR);
557 iob();
558
559 /* Enable scanning. */
560 dz_out(dport, DZ_CSR, DZ_MSE);
561
562 mux->initialised = 1;
563}
564
565static void dz_set_termios(struct uart_port *uport, struct ktermios *termios,
566 struct ktermios *old_termios)
567{
568 struct dz_port *dport = to_dport(uport);
569 unsigned long flags;
570 unsigned int cflag, baud;
571 int bflag;
572
573 cflag = dport->port.line;
574
575 switch (termios->c_cflag & CSIZE) {
576 case CS5:
577 cflag |= DZ_CS5;
578 break;
579 case CS6:
580 cflag |= DZ_CS6;
581 break;
582 case CS7:
583 cflag |= DZ_CS7;
584 break;
585 case CS8:
586 default:
587 cflag |= DZ_CS8;
588 }
589
590 if (termios->c_cflag & CSTOPB)
591 cflag |= DZ_CSTOPB;
592 if (termios->c_cflag & PARENB)
593 cflag |= DZ_PARENB;
594 if (termios->c_cflag & PARODD)
595 cflag |= DZ_PARODD;
596
597 baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600);
598 bflag = dz_encode_baud_rate(baud);
599 if (bflag < 0) { /* Try to keep unchanged. */
600 baud = uart_get_baud_rate(uport, old_termios, NULL, 50, 9600);
601 bflag = dz_encode_baud_rate(baud);
602 if (bflag < 0) { /* Resort to 9600. */
603 baud = 9600;
604 bflag = DZ_B9600;
605 }
606 tty_termios_encode_baud_rate(termios, baud, baud);
607 }
608 cflag |= bflag;
609
610 if (termios->c_cflag & CREAD)
611 cflag |= DZ_RXENAB;
612
613 spin_lock_irqsave(&dport->port.lock, flags);
614
615 uart_update_timeout(uport, termios->c_cflag, baud);
616
617 dz_out(dport, DZ_LPR, cflag);
618 dport->cflag = cflag;
619
620 /* setup accept flag */
621 dport->port.read_status_mask = DZ_OERR;
622 if (termios->c_iflag & INPCK)
623 dport->port.read_status_mask |= DZ_FERR | DZ_PERR;
624 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
625 dport->port.read_status_mask |= DZ_BREAK;
626
627 /* characters to ignore */
628 uport->ignore_status_mask = 0;
629 if ((termios->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
630 dport->port.ignore_status_mask |= DZ_OERR;
631 if (termios->c_iflag & IGNPAR)
632 dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR;
633 if (termios->c_iflag & IGNBRK)
634 dport->port.ignore_status_mask |= DZ_BREAK;
635
636 spin_unlock_irqrestore(&dport->port.lock, flags);
637}
638
639/*
640 * Hack alert!
641 * Required solely so that the initial PROM-based console
642 * works undisturbed in parallel with this one.
643 */
644static void dz_pm(struct uart_port *uport, unsigned int state,
645 unsigned int oldstate)
646{
647 struct dz_port *dport = to_dport(uport);
648 unsigned long flags;
649
650 spin_lock_irqsave(&dport->port.lock, flags);
651 if (state < 3)
652 dz_start_tx(&dport->port);
653 else
654 dz_stop_tx(&dport->port);
655 spin_unlock_irqrestore(&dport->port.lock, flags);
656}
657
658
659static const char *dz_type(struct uart_port *uport)
660{
661 return "DZ";
662}
663
664static void dz_release_port(struct uart_port *uport)
665{
666 struct dz_mux *mux = to_dport(uport)->mux;
667 int map_guard;
668
669 iounmap(uport->membase);
670 uport->membase = NULL;
671
672 map_guard = atomic_add_return(-1, &mux->map_guard);
673 if (!map_guard)
674 release_mem_region(uport->mapbase, dec_kn_slot_size);
675}
676
677static int dz_map_port(struct uart_port *uport)
678{
679 if (!uport->membase)
680 uport->membase = ioremap_nocache(uport->mapbase,
681 dec_kn_slot_size);
682 if (!uport->membase) {
683 printk(KERN_ERR "dz: Cannot map MMIO\n");
684 return -ENOMEM;
685 }
686 return 0;
687}
688
689static int dz_request_port(struct uart_port *uport)
690{
691 struct dz_mux *mux = to_dport(uport)->mux;
692 int map_guard;
693 int ret;
694
695 map_guard = atomic_add_return(1, &mux->map_guard);
696 if (map_guard == 1) {
697 if (!request_mem_region(uport->mapbase, dec_kn_slot_size,
698 "dz")) {
699 atomic_add(-1, &mux->map_guard);
700 printk(KERN_ERR
701 "dz: Unable to reserve MMIO resource\n");
702 return -EBUSY;
703 }
704 }
705 ret = dz_map_port(uport);
706 if (ret) {
707 map_guard = atomic_add_return(-1, &mux->map_guard);
708 if (!map_guard)
709 release_mem_region(uport->mapbase, dec_kn_slot_size);
710 return ret;
711 }
712 return 0;
713}
714
715static void dz_config_port(struct uart_port *uport, int flags)
716{
717 struct dz_port *dport = to_dport(uport);
718
719 if (flags & UART_CONFIG_TYPE) {
720 if (dz_request_port(uport))
721 return;
722
723 uport->type = PORT_DZ;
724
725 dz_reset(dport);
726 }
727}
728
729/*
730 * Verify the new serial_struct (for TIOCSSERIAL).
731 */
732static int dz_verify_port(struct uart_port *uport, struct serial_struct *ser)
733{
734 int ret = 0;
735
736 if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
737 ret = -EINVAL;
738 if (ser->irq != uport->irq)
739 ret = -EINVAL;
740 return ret;
741}
742
743static const struct uart_ops dz_ops = {
744 .tx_empty = dz_tx_empty,
745 .get_mctrl = dz_get_mctrl,
746 .set_mctrl = dz_set_mctrl,
747 .stop_tx = dz_stop_tx,
748 .start_tx = dz_start_tx,
749 .stop_rx = dz_stop_rx,
750 .break_ctl = dz_break_ctl,
751 .startup = dz_startup,
752 .shutdown = dz_shutdown,
753 .set_termios = dz_set_termios,
754 .pm = dz_pm,
755 .type = dz_type,
756 .release_port = dz_release_port,
757 .request_port = dz_request_port,
758 .config_port = dz_config_port,
759 .verify_port = dz_verify_port,
760};
761
762static void __init dz_init_ports(void)
763{
764 static int first = 1;
765 unsigned long base;
766 int line;
767
768 if (!first)
769 return;
770 first = 0;
771
772 if (mips_machtype == MACH_DS23100 || mips_machtype == MACH_DS5100)
773 base = dec_kn_slot_base + KN01_DZ11;
774 else
775 base = dec_kn_slot_base + KN02_DZ11;
776
777 for (line = 0; line < DZ_NB_PORT; line++) {
778 struct dz_port *dport = &dz_mux.dport[line];
779 struct uart_port *uport = &dport->port;
780
781 dport->mux = &dz_mux;
782
783 uport->irq = dec_interrupt[DEC_IRQ_DZ11];
784 uport->fifosize = 1;
785 uport->iotype = UPIO_MEM;
786 uport->flags = UPF_BOOT_AUTOCONF;
787 uport->ops = &dz_ops;
788 uport->line = line;
789 uport->mapbase = base;
790 }
791}
792
793#ifdef CONFIG_SERIAL_DZ_CONSOLE
794/*
795 * -------------------------------------------------------------------
796 * dz_console_putchar() -- transmit a character
797 *
798 * Polled transmission. This is tricky. We need to mask transmit
799 * interrupts so that they do not interfere, enable the transmitter
800 * for the line requested and then wait till the transmit scanner
801 * requests data for this line. But it may request data for another
802 * line first, in which case we have to disable its transmitter and
803 * repeat waiting till our line pops up. Only then the character may
804 * be transmitted. Finally, the state of the transmitter mask is
805 * restored. Welcome to the world of PDP-11!
806 * -------------------------------------------------------------------
807 */
808static void dz_console_putchar(struct uart_port *uport, int ch)
809{
810 struct dz_port *dport = to_dport(uport);
811 unsigned long flags;
812 unsigned short csr, tcr, trdy, mask;
813 int loops = 10000;
814
815 spin_lock_irqsave(&dport->port.lock, flags);
816 csr = dz_in(dport, DZ_CSR);
817 dz_out(dport, DZ_CSR, csr & ~DZ_TIE);
818 tcr = dz_in(dport, DZ_TCR);
819 tcr |= 1 << dport->port.line;
820 mask = tcr;
821 dz_out(dport, DZ_TCR, mask);
822 iob();
823 spin_unlock_irqrestore(&dport->port.lock, flags);
824
825 do {
826 trdy = dz_in(dport, DZ_CSR);
827 if (!(trdy & DZ_TRDY))
828 continue;
829 trdy = (trdy & DZ_TLINE) >> 8;
830 if (trdy == dport->port.line)
831 break;
832 mask &= ~(1 << trdy);
833 dz_out(dport, DZ_TCR, mask);
834 iob();
835 udelay(2);
836 } while (--loops);
837
838 if (loops) /* Cannot send otherwise. */
839 dz_out(dport, DZ_TDR, ch);
840
841 dz_out(dport, DZ_TCR, tcr);
842 dz_out(dport, DZ_CSR, csr);
843}
844
845/*
846 * -------------------------------------------------------------------
847 * dz_console_print ()
848 *
849 * dz_console_print is registered for printk.
850 * The console must be locked when we get here.
851 * -------------------------------------------------------------------
852 */
853static void dz_console_print(struct console *co,
854 const char *str,
855 unsigned int count)
856{
857 struct dz_port *dport = &dz_mux.dport[co->index];
858#ifdef DEBUG_DZ
859 prom_printf((char *) str);
860#endif
861 uart_console_write(&dport->port, str, count, dz_console_putchar);
862}
863
864static int __init dz_console_setup(struct console *co, char *options)
865{
866 struct dz_port *dport = &dz_mux.dport[co->index];
867 struct uart_port *uport = &dport->port;
868 int baud = 9600;
869 int bits = 8;
870 int parity = 'n';
871 int flow = 'n';
872 int ret;
873
874 ret = dz_map_port(uport);
875 if (ret)
876 return ret;
877
878 spin_lock_init(&dport->port.lock); /* For dz_pm(). */
879
880 dz_reset(dport);
881 dz_pm(uport, 0, -1);
882
883 if (options)
884 uart_parse_options(options, &baud, &parity, &bits, &flow);
885
886 return uart_set_options(&dport->port, co, baud, parity, bits, flow);
887}
888
889static struct uart_driver dz_reg;
890static struct console dz_console = {
891 .name = "ttyS",
892 .write = dz_console_print,
893 .device = uart_console_device,
894 .setup = dz_console_setup,
895 .flags = CON_PRINTBUFFER,
896 .index = -1,
897 .data = &dz_reg,
898};
899
900static int __init dz_serial_console_init(void)
901{
902 if (!IOASIC) {
903 dz_init_ports();
904 register_console(&dz_console);
905 return 0;
906 } else
907 return -ENXIO;
908}
909
910console_initcall(dz_serial_console_init);
911
912#define SERIAL_DZ_CONSOLE &dz_console
913#else
914#define SERIAL_DZ_CONSOLE NULL
915#endif /* CONFIG_SERIAL_DZ_CONSOLE */
916
917static struct uart_driver dz_reg = {
918 .owner = THIS_MODULE,
919 .driver_name = "serial",
920 .dev_name = "ttyS",
921 .major = TTY_MAJOR,
922 .minor = 64,
923 .nr = DZ_NB_PORT,
924 .cons = SERIAL_DZ_CONSOLE,
925};
926
927static int __init dz_init(void)
928{
929 int ret, i;
930
931 if (IOASIC)
932 return -ENXIO;
933
934 printk("%s%s\n", dz_name, dz_version);
935
936 dz_init_ports();
937
938 ret = uart_register_driver(&dz_reg);
939 if (ret)
940 return ret;
941
942 for (i = 0; i < DZ_NB_PORT; i++)
943 uart_add_one_port(&dz_reg, &dz_mux.dport[i].port);
944
945 return 0;
946}
947
948module_init(dz_init);
1/*
2 * dz.c: Serial port driver for DECstations equipped
3 * with the DZ chipset.
4 *
5 * Copyright (C) 1998 Olivier A. D. Lebaillif
6 *
7 * Email: olivier.lebaillif@ifrsys.com
8 *
9 * Copyright (C) 2004, 2006, 2007 Maciej W. Rozycki
10 *
11 * [31-AUG-98] triemer
12 * Changed IRQ to use Harald's dec internals interrupts.h
13 * removed base_addr code - moving address assignment to setup.c
14 * Changed name of dz_init to rs_init to be consistent with tc code
15 * [13-NOV-98] triemer fixed code to receive characters
16 * after patches by harald to irq code.
17 * [09-JAN-99] triemer minor fix for schedule - due to removal of timeout
18 * field from "current" - somewhere between 2.1.121 and 2.1.131
19 Qua Jun 27 15:02:26 BRT 2001
20 * [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups
21 *
22 * Parts (C) 1999 David Airlie, airlied@linux.ie
23 * [07-SEP-99] Bugfixes
24 *
25 * [06-Jan-2002] Russell King <rmk@arm.linux.org.uk>
26 * Converted to new serial core
27 */
28
29#undef DEBUG_DZ
30
31#if defined(CONFIG_SERIAL_DZ_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
32#define SUPPORT_SYSRQ
33#endif
34
35#include <linux/bitops.h>
36#include <linux/compiler.h>
37#include <linux/console.h>
38#include <linux/delay.h>
39#include <linux/errno.h>
40#include <linux/init.h>
41#include <linux/interrupt.h>
42#include <linux/ioport.h>
43#include <linux/kernel.h>
44#include <linux/major.h>
45#include <linux/module.h>
46#include <linux/serial.h>
47#include <linux/serial_core.h>
48#include <linux/sysrq.h>
49#include <linux/tty.h>
50#include <linux/tty_flip.h>
51
52#include <linux/atomic.h>
53#include <asm/bootinfo.h>
54#include <asm/io.h>
55
56#include <asm/dec/interrupts.h>
57#include <asm/dec/kn01.h>
58#include <asm/dec/kn02.h>
59#include <asm/dec/machtype.h>
60#include <asm/dec/prom.h>
61#include <asm/dec/system.h>
62
63#include "dz.h"
64
65
66MODULE_DESCRIPTION("DECstation DZ serial driver");
67MODULE_LICENSE("GPL");
68
69
70static char dz_name[] __initdata = "DECstation DZ serial driver version ";
71static char dz_version[] __initdata = "1.04";
72
73struct dz_port {
74 struct dz_mux *mux;
75 struct uart_port port;
76 unsigned int cflag;
77};
78
79struct dz_mux {
80 struct dz_port dport[DZ_NB_PORT];
81 atomic_t map_guard;
82 atomic_t irq_guard;
83 int initialised;
84};
85
86static struct dz_mux dz_mux;
87
88static inline struct dz_port *to_dport(struct uart_port *uport)
89{
90 return container_of(uport, struct dz_port, port);
91}
92
93/*
94 * ------------------------------------------------------------
95 * dz_in () and dz_out ()
96 *
97 * These routines are used to access the registers of the DZ
98 * chip, hiding relocation differences between implementation.
99 * ------------------------------------------------------------
100 */
101
102static u16 dz_in(struct dz_port *dport, unsigned offset)
103{
104 void __iomem *addr = dport->port.membase + offset;
105
106 return readw(addr);
107}
108
109static void dz_out(struct dz_port *dport, unsigned offset, u16 value)
110{
111 void __iomem *addr = dport->port.membase + offset;
112
113 writew(value, addr);
114}
115
116/*
117 * ------------------------------------------------------------
118 * rs_stop () and rs_start ()
119 *
120 * These routines are called before setting or resetting
121 * tty->stopped. They enable or disable transmitter interrupts,
122 * as necessary.
123 * ------------------------------------------------------------
124 */
125
126static void dz_stop_tx(struct uart_port *uport)
127{
128 struct dz_port *dport = to_dport(uport);
129 u16 tmp, mask = 1 << dport->port.line;
130
131 tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
132 tmp &= ~mask; /* clear the TX flag */
133 dz_out(dport, DZ_TCR, tmp);
134}
135
136static void dz_start_tx(struct uart_port *uport)
137{
138 struct dz_port *dport = to_dport(uport);
139 u16 tmp, mask = 1 << dport->port.line;
140
141 tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
142 tmp |= mask; /* set the TX flag */
143 dz_out(dport, DZ_TCR, tmp);
144}
145
146static void dz_stop_rx(struct uart_port *uport)
147{
148 struct dz_port *dport = to_dport(uport);
149
150 dport->cflag &= ~DZ_RXENAB;
151 dz_out(dport, DZ_LPR, dport->cflag);
152}
153
154static void dz_enable_ms(struct uart_port *uport)
155{
156 /* nothing to do */
157}
158
159/*
160 * ------------------------------------------------------------
161 *
162 * Here start the interrupt handling routines. All of the following
163 * subroutines are declared as inline and are folded into
164 * dz_interrupt. They were separated out for readability's sake.
165 *
166 * Note: dz_interrupt() is a "fast" interrupt, which means that it
167 * runs with interrupts turned off. People who may want to modify
168 * dz_interrupt() should try to keep the interrupt handler as fast as
169 * possible. After you are done making modifications, it is not a bad
170 * idea to do:
171 *
172 * make drivers/serial/dz.s
173 *
174 * and look at the resulting assemble code in dz.s.
175 *
176 * ------------------------------------------------------------
177 */
178
179/*
180 * ------------------------------------------------------------
181 * receive_char ()
182 *
183 * This routine deals with inputs from any lines.
184 * ------------------------------------------------------------
185 */
186static inline void dz_receive_chars(struct dz_mux *mux)
187{
188 struct uart_port *uport;
189 struct dz_port *dport = &mux->dport[0];
190 struct uart_icount *icount;
191 int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 };
192 unsigned char ch, flag;
193 u16 status;
194 int i;
195
196 while ((status = dz_in(dport, DZ_RBUF)) & DZ_DVAL) {
197 dport = &mux->dport[LINE(status)];
198 uport = &dport->port;
199
200 ch = UCHAR(status); /* grab the char */
201 flag = TTY_NORMAL;
202
203 icount = &uport->icount;
204 icount->rx++;
205
206 if (unlikely(status & (DZ_OERR | DZ_FERR | DZ_PERR))) {
207
208 /*
209 * There is no separate BREAK status bit, so treat
210 * null characters with framing errors as BREAKs;
211 * normally, otherwise. For this move the Framing
212 * Error bit to a simulated BREAK bit.
213 */
214 if (!ch) {
215 status |= (status & DZ_FERR) >>
216 (ffs(DZ_FERR) - ffs(DZ_BREAK));
217 status &= ~DZ_FERR;
218 }
219
220 /* Handle SysRq/SAK & keep track of the statistics. */
221 if (status & DZ_BREAK) {
222 icount->brk++;
223 if (uart_handle_break(uport))
224 continue;
225 } else if (status & DZ_FERR)
226 icount->frame++;
227 else if (status & DZ_PERR)
228 icount->parity++;
229 if (status & DZ_OERR)
230 icount->overrun++;
231
232 status &= uport->read_status_mask;
233 if (status & DZ_BREAK)
234 flag = TTY_BREAK;
235 else if (status & DZ_FERR)
236 flag = TTY_FRAME;
237 else if (status & DZ_PERR)
238 flag = TTY_PARITY;
239
240 }
241
242 if (uart_handle_sysrq_char(uport, ch))
243 continue;
244
245 uart_insert_char(uport, status, DZ_OERR, ch, flag);
246 lines_rx[LINE(status)] = 1;
247 }
248 for (i = 0; i < DZ_NB_PORT; i++)
249 if (lines_rx[i])
250 tty_flip_buffer_push(&mux->dport[i].port.state->port);
251}
252
253/*
254 * ------------------------------------------------------------
255 * transmit_char ()
256 *
257 * This routine deals with outputs to any lines.
258 * ------------------------------------------------------------
259 */
260static inline void dz_transmit_chars(struct dz_mux *mux)
261{
262 struct dz_port *dport = &mux->dport[0];
263 struct circ_buf *xmit;
264 unsigned char tmp;
265 u16 status;
266
267 status = dz_in(dport, DZ_CSR);
268 dport = &mux->dport[LINE(status)];
269 xmit = &dport->port.state->xmit;
270
271 if (dport->port.x_char) { /* XON/XOFF chars */
272 dz_out(dport, DZ_TDR, dport->port.x_char);
273 dport->port.icount.tx++;
274 dport->port.x_char = 0;
275 return;
276 }
277 /* If nothing to do or stopped or hardware stopped. */
278 if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
279 spin_lock(&dport->port.lock);
280 dz_stop_tx(&dport->port);
281 spin_unlock(&dport->port.lock);
282 return;
283 }
284
285 /*
286 * If something to do... (remember the dz has no output fifo,
287 * so we go one char at a time) :-<
288 */
289 tmp = xmit->buf[xmit->tail];
290 xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
291 dz_out(dport, DZ_TDR, tmp);
292 dport->port.icount.tx++;
293
294 if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
295 uart_write_wakeup(&dport->port);
296
297 /* Are we are done. */
298 if (uart_circ_empty(xmit)) {
299 spin_lock(&dport->port.lock);
300 dz_stop_tx(&dport->port);
301 spin_unlock(&dport->port.lock);
302 }
303}
304
305/*
306 * ------------------------------------------------------------
307 * check_modem_status()
308 *
309 * DS 3100 & 5100: Only valid for the MODEM line, duh!
310 * DS 5000/200: Valid for the MODEM and PRINTER line.
311 * ------------------------------------------------------------
312 */
313static inline void check_modem_status(struct dz_port *dport)
314{
315 /*
316 * FIXME:
317 * 1. No status change interrupt; use a timer.
318 * 2. Handle the 3100/5000 as appropriate. --macro
319 */
320 u16 status;
321
322 /* If not the modem line just return. */
323 if (dport->port.line != DZ_MODEM)
324 return;
325
326 status = dz_in(dport, DZ_MSR);
327
328 /* it's easy, since DSR2 is the only bit in the register */
329 if (status)
330 dport->port.icount.dsr++;
331}
332
333/*
334 * ------------------------------------------------------------
335 * dz_interrupt ()
336 *
337 * this is the main interrupt routine for the DZ chip.
338 * It deals with the multiple ports.
339 * ------------------------------------------------------------
340 */
341static irqreturn_t dz_interrupt(int irq, void *dev_id)
342{
343 struct dz_mux *mux = dev_id;
344 struct dz_port *dport = &mux->dport[0];
345 u16 status;
346
347 /* get the reason why we just got an irq */
348 status = dz_in(dport, DZ_CSR);
349
350 if ((status & (DZ_RDONE | DZ_RIE)) == (DZ_RDONE | DZ_RIE))
351 dz_receive_chars(mux);
352
353 if ((status & (DZ_TRDY | DZ_TIE)) == (DZ_TRDY | DZ_TIE))
354 dz_transmit_chars(mux);
355
356 return IRQ_HANDLED;
357}
358
359/*
360 * -------------------------------------------------------------------
361 * Here ends the DZ interrupt routines.
362 * -------------------------------------------------------------------
363 */
364
365static unsigned int dz_get_mctrl(struct uart_port *uport)
366{
367 /*
368 * FIXME: Handle the 3100/5000 as appropriate. --macro
369 */
370 struct dz_port *dport = to_dport(uport);
371 unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
372
373 if (dport->port.line == DZ_MODEM) {
374 if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR)
375 mctrl &= ~TIOCM_DSR;
376 }
377
378 return mctrl;
379}
380
381static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
382{
383 /*
384 * FIXME: Handle the 3100/5000 as appropriate. --macro
385 */
386 struct dz_port *dport = to_dport(uport);
387 u16 tmp;
388
389 if (dport->port.line == DZ_MODEM) {
390 tmp = dz_in(dport, DZ_TCR);
391 if (mctrl & TIOCM_DTR)
392 tmp &= ~DZ_MODEM_DTR;
393 else
394 tmp |= DZ_MODEM_DTR;
395 dz_out(dport, DZ_TCR, tmp);
396 }
397}
398
399/*
400 * -------------------------------------------------------------------
401 * startup ()
402 *
403 * various initialization tasks
404 * -------------------------------------------------------------------
405 */
406static int dz_startup(struct uart_port *uport)
407{
408 struct dz_port *dport = to_dport(uport);
409 struct dz_mux *mux = dport->mux;
410 unsigned long flags;
411 int irq_guard;
412 int ret;
413 u16 tmp;
414
415 irq_guard = atomic_add_return(1, &mux->irq_guard);
416 if (irq_guard != 1)
417 return 0;
418
419 ret = request_irq(dport->port.irq, dz_interrupt,
420 IRQF_SHARED, "dz", mux);
421 if (ret) {
422 atomic_add(-1, &mux->irq_guard);
423 printk(KERN_ERR "dz: Cannot get IRQ %d!\n", dport->port.irq);
424 return ret;
425 }
426
427 spin_lock_irqsave(&dport->port.lock, flags);
428
429 /* Enable interrupts. */
430 tmp = dz_in(dport, DZ_CSR);
431 tmp |= DZ_RIE | DZ_TIE;
432 dz_out(dport, DZ_CSR, tmp);
433
434 spin_unlock_irqrestore(&dport->port.lock, flags);
435
436 return 0;
437}
438
439/*
440 * -------------------------------------------------------------------
441 * shutdown ()
442 *
443 * This routine will shutdown a serial port; interrupts are disabled, and
444 * DTR is dropped if the hangup on close termio flag is on.
445 * -------------------------------------------------------------------
446 */
447static void dz_shutdown(struct uart_port *uport)
448{
449 struct dz_port *dport = to_dport(uport);
450 struct dz_mux *mux = dport->mux;
451 unsigned long flags;
452 int irq_guard;
453 u16 tmp;
454
455 spin_lock_irqsave(&dport->port.lock, flags);
456 dz_stop_tx(&dport->port);
457 spin_unlock_irqrestore(&dport->port.lock, flags);
458
459 irq_guard = atomic_add_return(-1, &mux->irq_guard);
460 if (!irq_guard) {
461 /* Disable interrupts. */
462 tmp = dz_in(dport, DZ_CSR);
463 tmp &= ~(DZ_RIE | DZ_TIE);
464 dz_out(dport, DZ_CSR, tmp);
465
466 free_irq(dport->port.irq, mux);
467 }
468}
469
470/*
471 * -------------------------------------------------------------------
472 * dz_tx_empty() -- get the transmitter empty status
473 *
474 * Purpose: Let user call ioctl() to get info when the UART physically
475 * is emptied. On bus types like RS485, the transmitter must
476 * release the bus after transmitting. This must be done when
477 * the transmit shift register is empty, not be done when the
478 * transmit holding register is empty. This functionality
479 * allows an RS485 driver to be written in user space.
480 * -------------------------------------------------------------------
481 */
482static unsigned int dz_tx_empty(struct uart_port *uport)
483{
484 struct dz_port *dport = to_dport(uport);
485 unsigned short tmp, mask = 1 << dport->port.line;
486
487 tmp = dz_in(dport, DZ_TCR);
488 tmp &= mask;
489
490 return tmp ? 0 : TIOCSER_TEMT;
491}
492
493static void dz_break_ctl(struct uart_port *uport, int break_state)
494{
495 /*
496 * FIXME: Can't access BREAK bits in TDR easily;
497 * reuse the code for polled TX. --macro
498 */
499 struct dz_port *dport = to_dport(uport);
500 unsigned long flags;
501 unsigned short tmp, mask = 1 << dport->port.line;
502
503 spin_lock_irqsave(&uport->lock, flags);
504 tmp = dz_in(dport, DZ_TCR);
505 if (break_state)
506 tmp |= mask;
507 else
508 tmp &= ~mask;
509 dz_out(dport, DZ_TCR, tmp);
510 spin_unlock_irqrestore(&uport->lock, flags);
511}
512
513static int dz_encode_baud_rate(unsigned int baud)
514{
515 switch (baud) {
516 case 50:
517 return DZ_B50;
518 case 75:
519 return DZ_B75;
520 case 110:
521 return DZ_B110;
522 case 134:
523 return DZ_B134;
524 case 150:
525 return DZ_B150;
526 case 300:
527 return DZ_B300;
528 case 600:
529 return DZ_B600;
530 case 1200:
531 return DZ_B1200;
532 case 1800:
533 return DZ_B1800;
534 case 2000:
535 return DZ_B2000;
536 case 2400:
537 return DZ_B2400;
538 case 3600:
539 return DZ_B3600;
540 case 4800:
541 return DZ_B4800;
542 case 7200:
543 return DZ_B7200;
544 case 9600:
545 return DZ_B9600;
546 default:
547 return -1;
548 }
549}
550
551
552static void dz_reset(struct dz_port *dport)
553{
554 struct dz_mux *mux = dport->mux;
555
556 if (mux->initialised)
557 return;
558
559 dz_out(dport, DZ_CSR, DZ_CLR);
560 while (dz_in(dport, DZ_CSR) & DZ_CLR);
561 iob();
562
563 /* Enable scanning. */
564 dz_out(dport, DZ_CSR, DZ_MSE);
565
566 mux->initialised = 1;
567}
568
569static void dz_set_termios(struct uart_port *uport, struct ktermios *termios,
570 struct ktermios *old_termios)
571{
572 struct dz_port *dport = to_dport(uport);
573 unsigned long flags;
574 unsigned int cflag, baud;
575 int bflag;
576
577 cflag = dport->port.line;
578
579 switch (termios->c_cflag & CSIZE) {
580 case CS5:
581 cflag |= DZ_CS5;
582 break;
583 case CS6:
584 cflag |= DZ_CS6;
585 break;
586 case CS7:
587 cflag |= DZ_CS7;
588 break;
589 case CS8:
590 default:
591 cflag |= DZ_CS8;
592 }
593
594 if (termios->c_cflag & CSTOPB)
595 cflag |= DZ_CSTOPB;
596 if (termios->c_cflag & PARENB)
597 cflag |= DZ_PARENB;
598 if (termios->c_cflag & PARODD)
599 cflag |= DZ_PARODD;
600
601 baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600);
602 bflag = dz_encode_baud_rate(baud);
603 if (bflag < 0) { /* Try to keep unchanged. */
604 baud = uart_get_baud_rate(uport, old_termios, NULL, 50, 9600);
605 bflag = dz_encode_baud_rate(baud);
606 if (bflag < 0) { /* Resort to 9600. */
607 baud = 9600;
608 bflag = DZ_B9600;
609 }
610 tty_termios_encode_baud_rate(termios, baud, baud);
611 }
612 cflag |= bflag;
613
614 if (termios->c_cflag & CREAD)
615 cflag |= DZ_RXENAB;
616
617 spin_lock_irqsave(&dport->port.lock, flags);
618
619 uart_update_timeout(uport, termios->c_cflag, baud);
620
621 dz_out(dport, DZ_LPR, cflag);
622 dport->cflag = cflag;
623
624 /* setup accept flag */
625 dport->port.read_status_mask = DZ_OERR;
626 if (termios->c_iflag & INPCK)
627 dport->port.read_status_mask |= DZ_FERR | DZ_PERR;
628 if (termios->c_iflag & (BRKINT | PARMRK))
629 dport->port.read_status_mask |= DZ_BREAK;
630
631 /* characters to ignore */
632 uport->ignore_status_mask = 0;
633 if ((termios->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
634 dport->port.ignore_status_mask |= DZ_OERR;
635 if (termios->c_iflag & IGNPAR)
636 dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR;
637 if (termios->c_iflag & IGNBRK)
638 dport->port.ignore_status_mask |= DZ_BREAK;
639
640 spin_unlock_irqrestore(&dport->port.lock, flags);
641}
642
643/*
644 * Hack alert!
645 * Required solely so that the initial PROM-based console
646 * works undisturbed in parallel with this one.
647 */
648static void dz_pm(struct uart_port *uport, unsigned int state,
649 unsigned int oldstate)
650{
651 struct dz_port *dport = to_dport(uport);
652 unsigned long flags;
653
654 spin_lock_irqsave(&dport->port.lock, flags);
655 if (state < 3)
656 dz_start_tx(&dport->port);
657 else
658 dz_stop_tx(&dport->port);
659 spin_unlock_irqrestore(&dport->port.lock, flags);
660}
661
662
663static const char *dz_type(struct uart_port *uport)
664{
665 return "DZ";
666}
667
668static void dz_release_port(struct uart_port *uport)
669{
670 struct dz_mux *mux = to_dport(uport)->mux;
671 int map_guard;
672
673 iounmap(uport->membase);
674 uport->membase = NULL;
675
676 map_guard = atomic_add_return(-1, &mux->map_guard);
677 if (!map_guard)
678 release_mem_region(uport->mapbase, dec_kn_slot_size);
679}
680
681static int dz_map_port(struct uart_port *uport)
682{
683 if (!uport->membase)
684 uport->membase = ioremap_nocache(uport->mapbase,
685 dec_kn_slot_size);
686 if (!uport->membase) {
687 printk(KERN_ERR "dz: Cannot map MMIO\n");
688 return -ENOMEM;
689 }
690 return 0;
691}
692
693static int dz_request_port(struct uart_port *uport)
694{
695 struct dz_mux *mux = to_dport(uport)->mux;
696 int map_guard;
697 int ret;
698
699 map_guard = atomic_add_return(1, &mux->map_guard);
700 if (map_guard == 1) {
701 if (!request_mem_region(uport->mapbase, dec_kn_slot_size,
702 "dz")) {
703 atomic_add(-1, &mux->map_guard);
704 printk(KERN_ERR
705 "dz: Unable to reserve MMIO resource\n");
706 return -EBUSY;
707 }
708 }
709 ret = dz_map_port(uport);
710 if (ret) {
711 map_guard = atomic_add_return(-1, &mux->map_guard);
712 if (!map_guard)
713 release_mem_region(uport->mapbase, dec_kn_slot_size);
714 return ret;
715 }
716 return 0;
717}
718
719static void dz_config_port(struct uart_port *uport, int flags)
720{
721 struct dz_port *dport = to_dport(uport);
722
723 if (flags & UART_CONFIG_TYPE) {
724 if (dz_request_port(uport))
725 return;
726
727 uport->type = PORT_DZ;
728
729 dz_reset(dport);
730 }
731}
732
733/*
734 * Verify the new serial_struct (for TIOCSSERIAL).
735 */
736static int dz_verify_port(struct uart_port *uport, struct serial_struct *ser)
737{
738 int ret = 0;
739
740 if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
741 ret = -EINVAL;
742 if (ser->irq != uport->irq)
743 ret = -EINVAL;
744 return ret;
745}
746
747static struct uart_ops dz_ops = {
748 .tx_empty = dz_tx_empty,
749 .get_mctrl = dz_get_mctrl,
750 .set_mctrl = dz_set_mctrl,
751 .stop_tx = dz_stop_tx,
752 .start_tx = dz_start_tx,
753 .stop_rx = dz_stop_rx,
754 .enable_ms = dz_enable_ms,
755 .break_ctl = dz_break_ctl,
756 .startup = dz_startup,
757 .shutdown = dz_shutdown,
758 .set_termios = dz_set_termios,
759 .pm = dz_pm,
760 .type = dz_type,
761 .release_port = dz_release_port,
762 .request_port = dz_request_port,
763 .config_port = dz_config_port,
764 .verify_port = dz_verify_port,
765};
766
767static void __init dz_init_ports(void)
768{
769 static int first = 1;
770 unsigned long base;
771 int line;
772
773 if (!first)
774 return;
775 first = 0;
776
777 if (mips_machtype == MACH_DS23100 || mips_machtype == MACH_DS5100)
778 base = dec_kn_slot_base + KN01_DZ11;
779 else
780 base = dec_kn_slot_base + KN02_DZ11;
781
782 for (line = 0; line < DZ_NB_PORT; line++) {
783 struct dz_port *dport = &dz_mux.dport[line];
784 struct uart_port *uport = &dport->port;
785
786 dport->mux = &dz_mux;
787
788 uport->irq = dec_interrupt[DEC_IRQ_DZ11];
789 uport->fifosize = 1;
790 uport->iotype = UPIO_MEM;
791 uport->flags = UPF_BOOT_AUTOCONF;
792 uport->ops = &dz_ops;
793 uport->line = line;
794 uport->mapbase = base;
795 }
796}
797
798#ifdef CONFIG_SERIAL_DZ_CONSOLE
799/*
800 * -------------------------------------------------------------------
801 * dz_console_putchar() -- transmit a character
802 *
803 * Polled transmission. This is tricky. We need to mask transmit
804 * interrupts so that they do not interfere, enable the transmitter
805 * for the line requested and then wait till the transmit scanner
806 * requests data for this line. But it may request data for another
807 * line first, in which case we have to disable its transmitter and
808 * repeat waiting till our line pops up. Only then the character may
809 * be transmitted. Finally, the state of the transmitter mask is
810 * restored. Welcome to the world of PDP-11!
811 * -------------------------------------------------------------------
812 */
813static void dz_console_putchar(struct uart_port *uport, int ch)
814{
815 struct dz_port *dport = to_dport(uport);
816 unsigned long flags;
817 unsigned short csr, tcr, trdy, mask;
818 int loops = 10000;
819
820 spin_lock_irqsave(&dport->port.lock, flags);
821 csr = dz_in(dport, DZ_CSR);
822 dz_out(dport, DZ_CSR, csr & ~DZ_TIE);
823 tcr = dz_in(dport, DZ_TCR);
824 tcr |= 1 << dport->port.line;
825 mask = tcr;
826 dz_out(dport, DZ_TCR, mask);
827 iob();
828 spin_unlock_irqrestore(&dport->port.lock, flags);
829
830 do {
831 trdy = dz_in(dport, DZ_CSR);
832 if (!(trdy & DZ_TRDY))
833 continue;
834 trdy = (trdy & DZ_TLINE) >> 8;
835 if (trdy == dport->port.line)
836 break;
837 mask &= ~(1 << trdy);
838 dz_out(dport, DZ_TCR, mask);
839 iob();
840 udelay(2);
841 } while (--loops);
842
843 if (loops) /* Cannot send otherwise. */
844 dz_out(dport, DZ_TDR, ch);
845
846 dz_out(dport, DZ_TCR, tcr);
847 dz_out(dport, DZ_CSR, csr);
848}
849
850/*
851 * -------------------------------------------------------------------
852 * dz_console_print ()
853 *
854 * dz_console_print is registered for printk.
855 * The console must be locked when we get here.
856 * -------------------------------------------------------------------
857 */
858static void dz_console_print(struct console *co,
859 const char *str,
860 unsigned int count)
861{
862 struct dz_port *dport = &dz_mux.dport[co->index];
863#ifdef DEBUG_DZ
864 prom_printf((char *) str);
865#endif
866 uart_console_write(&dport->port, str, count, dz_console_putchar);
867}
868
869static int __init dz_console_setup(struct console *co, char *options)
870{
871 struct dz_port *dport = &dz_mux.dport[co->index];
872 struct uart_port *uport = &dport->port;
873 int baud = 9600;
874 int bits = 8;
875 int parity = 'n';
876 int flow = 'n';
877 int ret;
878
879 ret = dz_map_port(uport);
880 if (ret)
881 return ret;
882
883 spin_lock_init(&dport->port.lock); /* For dz_pm(). */
884
885 dz_reset(dport);
886 dz_pm(uport, 0, -1);
887
888 if (options)
889 uart_parse_options(options, &baud, &parity, &bits, &flow);
890
891 return uart_set_options(&dport->port, co, baud, parity, bits, flow);
892}
893
894static struct uart_driver dz_reg;
895static struct console dz_console = {
896 .name = "ttyS",
897 .write = dz_console_print,
898 .device = uart_console_device,
899 .setup = dz_console_setup,
900 .flags = CON_PRINTBUFFER,
901 .index = -1,
902 .data = &dz_reg,
903};
904
905static int __init dz_serial_console_init(void)
906{
907 if (!IOASIC) {
908 dz_init_ports();
909 register_console(&dz_console);
910 return 0;
911 } else
912 return -ENXIO;
913}
914
915console_initcall(dz_serial_console_init);
916
917#define SERIAL_DZ_CONSOLE &dz_console
918#else
919#define SERIAL_DZ_CONSOLE NULL
920#endif /* CONFIG_SERIAL_DZ_CONSOLE */
921
922static struct uart_driver dz_reg = {
923 .owner = THIS_MODULE,
924 .driver_name = "serial",
925 .dev_name = "ttyS",
926 .major = TTY_MAJOR,
927 .minor = 64,
928 .nr = DZ_NB_PORT,
929 .cons = SERIAL_DZ_CONSOLE,
930};
931
932static int __init dz_init(void)
933{
934 int ret, i;
935
936 if (IOASIC)
937 return -ENXIO;
938
939 printk("%s%s\n", dz_name, dz_version);
940
941 dz_init_ports();
942
943 ret = uart_register_driver(&dz_reg);
944 if (ret)
945 return ret;
946
947 for (i = 0; i < DZ_NB_PORT; i++)
948 uart_add_one_port(&dz_reg, &dz_mux.dport[i].port);
949
950 return 0;
951}
952
953module_init(dz_init);