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[PATCH] TTY layer buffering revamp
[deliverable/linux.git] / drivers / serial / dz.c
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1da177e4 1/*
fd8c5972 2 * dz.c: Serial port driver for DECStations equiped
1da177e4
LT		 3 * with the DZ chipset.
4 *
fd8c5972
RB		 5 * Copyright (C) 1998 Olivier A. D. Lebaillif
6 *
1da177e4
LT		 7 * Email: olivier.lebaillif@ifrsys.com
8 *
9 * [31-AUG-98] triemer
10 * Changed IRQ to use Harald's dec internals interrupts.h
11 * removed base_addr code - moving address assignment to setup.c
12 * Changed name of dz_init to rs_init to be consistent with tc code
13 * [13-NOV-98] triemer fixed code to receive characters
fd8c5972 14 * after patches by harald to irq code.
1da177e4
LT		 15 * [09-JAN-99] triemer minor fix for schedule - due to removal of timeout
16 * field from "current" - somewhere between 2.1.121 and 2.1.131
17 Qua Jun 27 15:02:26 BRT 2001
18 * [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups
fd8c5972
RB		 19 *
20 * Parts (C) 1999 David Airlie, airlied@linux.ie
21 * [07-SEP-99] Bugfixes
1da177e4
LT		 22 *
23 * [06-Jan-2002] Russell King <rmk@arm.linux.org.uk>
24 * Converted to new serial core
25 */
26
27#undef DEBUG_DZ
28
29#include <linux/config.h>
30#include <linux/module.h>
31#include <linux/interrupt.h>
32#include <linux/init.h>
33#include <linux/console.h>
34#include <linux/tty.h>
35#include <linux/tty_flip.h>
36#include <linux/serial_core.h>
37#include <linux/serial.h>
38
39#include <asm/bootinfo.h>
40#include <asm/dec/interrupts.h>
41#include <asm/dec/kn01.h>
42#include <asm/dec/kn02.h>
43#include <asm/dec/machtype.h>
44#include <asm/dec/prom.h>
45#include <asm/irq.h>
46#include <asm/system.h>
47#include <asm/uaccess.h>
48
49#define CONSOLE_LINE (3) /* for definition of struct console */
50
51#include "dz.h"
52
53#define DZ_INTR_DEBUG 1
54
55static char *dz_name = "DECstation DZ serial driver version ";
56static char *dz_version = "1.02";
57
58struct dz_port {
59 struct uart_port port;
60 unsigned int cflag;
61};
62
63static struct dz_port dz_ports[DZ_NB_PORT];
64
65#ifdef DEBUG_DZ
66/*
fd8c5972 67 * debugging code to send out chars via prom
1da177e4
LT		 68 */
69static void debug_console(const char *s, int count)
70{
71 unsigned i;
72
73 for (i = 0; i < count; i++) {
74 if (*s == 10)
75 prom_printf("%c", 13);
76 prom_printf("%c", *s++);
77 }
78}
79#endif
80
81/*
82 * ------------------------------------------------------------
83 * dz_in () and dz_out ()
84 *
fd8c5972 85 * These routines are used to access the registers of the DZ
1da177e4
LT		 86 * chip, hiding relocation differences between implementation.
87 * ------------------------------------------------------------
88 */
89
90static inline unsigned short dz_in(struct dz_port *dport, unsigned offset)
91{
92 volatile unsigned short *addr =
93 (volatile unsigned short *) (dport->port.membase + offset);
94 return *addr;
95}
96
97static inline void dz_out(struct dz_port *dport, unsigned offset,
98 unsigned short value)
99{
100 volatile unsigned short *addr =
101 (volatile unsigned short *) (dport->port.membase + offset);
102 *addr = value;
103}
104
105/*
106 * ------------------------------------------------------------
107 * rs_stop () and rs_start ()
108 *
fd8c5972
RB		 109 * These routines are called before setting or resetting
110 * tty->stopped. They enable or disable transmitter interrupts,
1da177e4
LT		 111 * as necessary.
112 * ------------------------------------------------------------
113 */
114
b129a8cc 115static void dz_stop_tx(struct uart_port *uport)
1da177e4
LT		 116{
117 struct dz_port *dport = (struct dz_port *)uport;
118 unsigned short tmp, mask = 1 << dport->port.line;
119 unsigned long flags;
120
121 spin_lock_irqsave(&dport->port.lock, flags);
122 tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
123 tmp &= ~mask; /* clear the TX flag */
124 dz_out(dport, DZ_TCR, tmp);
125 spin_unlock_irqrestore(&dport->port.lock, flags);
126}
127
b129a8cc 128static void dz_start_tx(struct uart_port *uport)
1da177e4
LT		 129{
130 struct dz_port *dport = (struct dz_port *)uport;
131 unsigned short tmp, mask = 1 << dport->port.line;
132 unsigned long flags;
133
134 spin_lock_irqsave(&dport->port.lock, flags);
135 tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
136 tmp |= mask; /* set the TX flag */
137 dz_out(dport, DZ_TCR, tmp);
138 spin_unlock_irqrestore(&dport->port.lock, flags);
139}
140
141static void dz_stop_rx(struct uart_port *uport)
142{
143 struct dz_port *dport = (struct dz_port *)uport;
144 unsigned long flags;
145
146 spin_lock_irqsave(&dport->port.lock, flags);
147 dport->cflag &= ~DZ_CREAD;
148 dz_out(dport, DZ_LPR, dport->cflag);
149 spin_unlock_irqrestore(&dport->port.lock, flags);
150}
151
152static void dz_enable_ms(struct uart_port *port)
153{
154 /* nothing to do */
155}
156
157/*
158 * ------------------------------------------------------------
fd8c5972
RB		 159 * Here starts the interrupt handling routines. All of the
160 * following subroutines are declared as inline and are folded
161 * into dz_interrupt. They were separated out for readability's
162 * sake.
1da177e4
LT		 163 *
164 * Note: rs_interrupt() is a "fast" interrupt, which means that it
165 * runs with interrupts turned off. People who may want to modify
166 * rs_interrupt() should try to keep the interrupt handler as fast as
167 * possible. After you are done making modifications, it is not a bad
168 * idea to do:
fd8c5972 169 *
1da177e4
LT		 170 * make drivers/serial/dz.s
171 *
172 * and look at the resulting assemble code in dz.s.
173 *
174 * ------------------------------------------------------------
175 */
176
177/*
178 * ------------------------------------------------------------
179 * receive_char ()
180 *
181 * This routine deals with inputs from any lines.
182 * ------------------------------------------------------------
183 */
184static inline void dz_receive_chars(struct dz_port *dport)
185{
186 struct tty_struct *tty = NULL;
187 struct uart_icount *icount;
188 int ignore = 0;
189 unsigned short status, tmp;
190 unsigned char ch, flag;
191
192 /* this code is going to be a problem...
193 the call to tty_flip_buffer is going to need
194 to be rethought...
195 */
196 do {
197 status = dz_in(dport, DZ_RBUF);
198
199 /* punt so we don't get duplicate characters */
200 if (!(status & DZ_DVAL))
201 goto ignore_char;
202
203
204 ch = UCHAR(status); /* grab the char */
205 flag = TTY_NORMAL;
206
207#if 0
208 if (info->is_console) {
209 if (ch == 0)
210 return; /* it's a break ... */
211 }
212#endif
213
214 tty = dport->port.info->tty;/* now tty points to the proper dev */
215 icount = &dport->port.icount;
216
217 if (!tty)
218 break;
1da177e4
LT		 219
220 icount->rx++;
221
222 /* keep track of the statistics */
223 if (status & (DZ_OERR | DZ_FERR | DZ_PERR)) {
224 if (status & DZ_PERR) /* parity error */
225 icount->parity++;
226 else if (status & DZ_FERR) /* frame error */
227 icount->frame++;
228 if (status & DZ_OERR) /* overrun error */
229 icount->overrun++;
230
231 /* check to see if we should ignore the character
232 and mask off conditions that should be ignored
233 */
234
235 if (status & dport->port.ignore_status_mask) {
236 if (++ignore > 100)
237 break;
238 goto ignore_char;
239 }
240 /* mask off the error conditions we want to ignore */
241 tmp = status & dport->port.read_status_mask;
242
243 if (tmp & DZ_PERR) {
244 flag = TTY_PARITY;
245#ifdef DEBUG_DZ
246 debug_console("PERR\n", 5);
247#endif
248 } else if (tmp & DZ_FERR) {
249 flag = TTY_FRAME;
250#ifdef DEBUG_DZ
251 debug_console("FERR\n", 5);
252#endif
253 }
254 if (tmp & DZ_OERR) {
255#ifdef DEBUG_DZ
256 debug_console("OERR\n", 5);
257#endif
258 tty_insert_flip_char(tty, ch, flag);
259 ch = 0;
260 flag = TTY_OVERRUN;
261 }
262 }
263 tty_insert_flip_char(tty, ch, flag);
264 ignore_char:
265 } while (status & DZ_DVAL);
266
267 if (tty)
268 tty_flip_buffer_push(tty);
269}
270
271/*
272 * ------------------------------------------------------------
273 * transmit_char ()
274 *
275 * This routine deals with outputs to any lines.
276 * ------------------------------------------------------------
277 */
278static inline void dz_transmit_chars(struct dz_port *dport)
279{
280 struct circ_buf *xmit = &dport->port.info->xmit;
281 unsigned char tmp;
282
283 if (dport->port.x_char) { /* XON/XOFF chars */
284 dz_out(dport, DZ_TDR, dport->port.x_char);
285 dport->port.icount.tx++;
286 dport->port.x_char = 0;
287 return;
288 }
289 /* if nothing to do or stopped or hardware stopped */
290 if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
b129a8cc 291 dz_stop_tx(&dport->port);
1da177e4
LT		 292 return;
293 }
294
295 /*
296 * if something to do ... (rember the dz has no output fifo so we go
297 * one char at a time :-<
298 */
299 tmp = xmit->buf[xmit->tail];
300 xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
301 dz_out(dport, DZ_TDR, tmp);
302 dport->port.icount.tx++;
303
304 if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
305 uart_write_wakeup(&dport->port);
306
307 /* Are we done */
308 if (uart_circ_empty(xmit))
b129a8cc 309 dz_stop_tx(&dport->port);
1da177e4
LT		 310}
311
312/*
313 * ------------------------------------------------------------
314 * check_modem_status ()
315 *
316 * Only valid for the MODEM line duh !
317 * ------------------------------------------------------------
318 */
319static inline void check_modem_status(struct dz_port *dport)
320{
321 unsigned short status;
322
323 /* if not ne modem line just return */
324 if (dport->port.line != DZ_MODEM)
325 return;
326
327 status = dz_in(dport, DZ_MSR);
328
329 /* it's easy, since DSR2 is the only bit in the register */
330 if (status)
331 dport->port.icount.dsr++;
332}
333
334/*
335 * ------------------------------------------------------------
336 * dz_interrupt ()
337 *
338 * this is the main interrupt routine for the DZ chip.
339 * It deals with the multiple ports.
340 * ------------------------------------------------------------
341 */
342static irqreturn_t dz_interrupt(int irq, void *dev, struct pt_regs *regs)
343{
344 struct dz_port *dport;
345 unsigned short status;
346
347 /* get the reason why we just got an irq */
348 status = dz_in((struct dz_port *)dev, DZ_CSR);
349 dport = &dz_ports[LINE(status)];
350
351 if (status & DZ_RDONE)
352 dz_receive_chars(dport);
353
354 if (status & DZ_TRDY)
355 dz_transmit_chars(dport);
356
357 /* FIXME: what about check modem status??? --rmk */
358
359 return IRQ_HANDLED;
360}
361
362/*
363 * -------------------------------------------------------------------
364 * Here ends the DZ interrupt routines.
365 * -------------------------------------------------------------------
366 */
367
368static unsigned int dz_get_mctrl(struct uart_port *uport)
369{
370 struct dz_port *dport = (struct dz_port *)uport;
371 unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
372
373 if (dport->port.line == DZ_MODEM) {
374 /*
375 * CHECKME: This is a guess from the other code... --rmk
376 */
377 if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR)
378 mctrl &= ~TIOCM_DSR;
379 }
380
381 return mctrl;
382}
383
384static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
385{
386 struct dz_port *dport = (struct dz_port *)uport;
387 unsigned short 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
fd8c5972 404 * -------------------------------------------------------------------
1da177e4
LT		 405 */
406static int dz_startup(struct uart_port *uport)
407{
408 struct dz_port *dport = (struct dz_port *)uport;
409 unsigned long flags;
410 unsigned short tmp;
411
412 /* The dz lines for the mouse/keyboard must be
413 * opened using their respective drivers.
414 */
415 if ((dport->port.line == DZ_KEYBOARD) ||
416 (dport->port.line == DZ_MOUSE))
417 return -ENODEV;
418
419 spin_lock_irqsave(&dport->port.lock, flags);
420
421 /* enable the interrupt and the scanning */
422 tmp = dz_in(dport, DZ_CSR);
423 tmp |= DZ_RIE | DZ_TIE | DZ_MSE;
424 dz_out(dport, DZ_CSR, tmp);
425
426 spin_unlock_irqrestore(&dport->port.lock, flags);
427
428 return 0;
429}
430
fd8c5972 431/*
1da177e4
LT		 432 * -------------------------------------------------------------------
433 * shutdown ()
434 *
435 * This routine will shutdown a serial port; interrupts are disabled, and
436 * DTR is dropped if the hangup on close termio flag is on.
fd8c5972 437 * -------------------------------------------------------------------
1da177e4
LT		 438 */
439static void dz_shutdown(struct uart_port *uport)
440{
b129a8cc 441 dz_stop_tx(uport);
1da177e4
LT		 442}
443
444/*
445 * get_lsr_info - get line status register info
446 *
447 * Purpose: Let user call ioctl() to get info when the UART physically
448 * is emptied. On bus types like RS485, the transmitter must
449 * release the bus after transmitting. This must be done when
450 * the transmit shift register is empty, not be done when the
451 * transmit holding register is empty. This functionality
fd8c5972 452 * allows an RS485 driver to be written in user space.
1da177e4
LT		 453 */
454static unsigned int dz_tx_empty(struct uart_port *uport)
455{
456 struct dz_port *dport = (struct dz_port *)uport;
457 unsigned short status = dz_in(dport, DZ_LPR);
458
459 /* FIXME: this appears to be obviously broken --rmk. */
460 return status ? TIOCSER_TEMT : 0;
461}
462
463static void dz_break_ctl(struct uart_port *uport, int break_state)
464{
465 struct dz_port *dport = (struct dz_port *)uport;
466 unsigned long flags;
467 unsigned short tmp, mask = 1 << uport->line;
468
469 spin_lock_irqsave(&uport->lock, flags);
470 tmp = dz_in(dport, DZ_TCR);
471 if (break_state)
472 tmp |= mask;
473 else
474 tmp &= ~mask;
475 dz_out(dport, DZ_TCR, tmp);
476 spin_unlock_irqrestore(&uport->lock, flags);
477}
478
479static void dz_set_termios(struct uart_port *uport, struct termios *termios,
480 struct termios *old_termios)
481{
482 struct dz_port *dport = (struct dz_port *)uport;
483 unsigned long flags;
484 unsigned int cflag, baud;
485
486 cflag = dport->port.line;
487
488 switch (termios->c_cflag & CSIZE) {
489 case CS5:
490 cflag |= DZ_CS5;
491 break;
492 case CS6:
493 cflag |= DZ_CS6;
494 break;
495 case CS7:
496 cflag |= DZ_CS7;
497 break;
498 case CS8:
499 default:
500 cflag |= DZ_CS8;
501 }
502
503 if (termios->c_cflag & CSTOPB)
504 cflag |= DZ_CSTOPB;
505 if (termios->c_cflag & PARENB)
506 cflag |= DZ_PARENB;
507 if (termios->c_cflag & PARODD)
508 cflag |= DZ_PARODD;
509
510 baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600);
511 switch (baud) {
512 case 50:
513 cflag |= DZ_B50;
514 break;
515 case 75:
516 cflag |= DZ_B75;
517 break;
518 case 110:
519 cflag |= DZ_B110;
520 break;
521 case 134:
522 cflag |= DZ_B134;
523 break;
524 case 150:
525 cflag |= DZ_B150;
526 break;
527 case 300:
528 cflag |= DZ_B300;
529 break;
530 case 600:
531 cflag |= DZ_B600;
532 break;
533 case 1200:
534 cflag |= DZ_B1200;
535 break;
536 case 1800:
537 cflag |= DZ_B1800;
538 break;
539 case 2000:
540 cflag |= DZ_B2000;
541 break;
542 case 2400:
543 cflag |= DZ_B2400;
544 break;
545 case 3600:
546 cflag |= DZ_B3600;
547 break;
548 case 4800:
549 cflag |= DZ_B4800;
550 break;
551 case 7200:
552 cflag |= DZ_B7200;
553 break;
554 case 9600:
555 default:
556 cflag |= DZ_B9600;
557 }
558
559 if (termios->c_cflag & CREAD)
560 cflag |= DZ_RXENAB;
561
562 spin_lock_irqsave(&dport->port.lock, flags);
563
564 dz_out(dport, DZ_LPR, cflag);
565 dport->cflag = cflag;
566
567 /* setup accept flag */
568 dport->port.read_status_mask = DZ_OERR;
569 if (termios->c_iflag & INPCK)
570 dport->port.read_status_mask |= DZ_FERR | DZ_PERR;
571
572 /* characters to ignore */
573 uport->ignore_status_mask = 0;
574 if (termios->c_iflag & IGNPAR)
575 dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR;
576
577 spin_unlock_irqrestore(&dport->port.lock, flags);
578}
579
580static const char *dz_type(struct uart_port *port)
581{
582 return "DZ";
583}
584
585static void dz_release_port(struct uart_port *port)
586{
587 /* nothing to do */
588}
589
590static int dz_request_port(struct uart_port *port)
591{
592 return 0;
593}
594
595static void dz_config_port(struct uart_port *port, int flags)
596{
597 if (flags & UART_CONFIG_TYPE)
598 port->type = PORT_DZ;
599}
600
601/*
602 * verify the new serial_struct (for TIOCSSERIAL).
603 */
604static int dz_verify_port(struct uart_port *port, struct serial_struct *ser)
605{
606 int ret = 0;
607 if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
608 ret = -EINVAL;
609 if (ser->irq != port->irq)
610 ret = -EINVAL;
611 return ret;
612}
613
614static struct uart_ops dz_ops = {
615 .tx_empty = dz_tx_empty,
616 .get_mctrl = dz_get_mctrl,
617 .set_mctrl = dz_set_mctrl,
618 .stop_tx = dz_stop_tx,
619 .start_tx = dz_start_tx,
620 .stop_rx = dz_stop_rx,
621 .enable_ms = dz_enable_ms,
622 .break_ctl = dz_break_ctl,
623 .startup = dz_startup,
624 .shutdown = dz_shutdown,
625 .set_termios = dz_set_termios,
626 .type = dz_type,
627 .release_port = dz_release_port,
628 .request_port = dz_request_port,
629 .config_port = dz_config_port,
630 .verify_port = dz_verify_port,
631};
632
633static void __init dz_init_ports(void)
634{
635 static int first = 1;
636 struct dz_port *dport;
637 unsigned long base;
638 int i;
639
640 if (!first)
641 return;
642 first = 0;
643
644 if (mips_machtype == MACH_DS23100 ||
645 mips_machtype == MACH_DS5100)
46677736 646 base = CKSEG1ADDR(KN01_SLOT_BASE + KN01_DZ11);
1da177e4 647 else
46677736 648 base = CKSEG1ADDR(KN02_SLOT_BASE + KN02_DZ11);
1da177e4
LT		 649
650 for (i = 0, dport = dz_ports; i < DZ_NB_PORT; i++, dport++) {
651 spin_lock_init(&dport->port.lock);
652 dport->port.membase = (char *) base;
653 dport->port.iotype = SERIAL_IO_PORT;
654 dport->port.irq = dec_interrupt[DEC_IRQ_DZ11];
655 dport->port.line = i;
656 dport->port.fifosize = 1;
657 dport->port.ops = &dz_ops;
658 dport->port.flags = UPF_BOOT_AUTOCONF;
659 }
660}
661
662static void dz_reset(struct dz_port *dport)
663{
664 dz_out(dport, DZ_CSR, DZ_CLR);
665
666 while (dz_in(dport, DZ_CSR) & DZ_CLR);
667 /* FIXME: cpu_relax? */
668
669 iob();
670
671 /* enable scanning */
672 dz_out(dport, DZ_CSR, DZ_MSE);
673}
674
675#ifdef CONFIG_SERIAL_DZ_CONSOLE
676static void dz_console_put_char(struct dz_port *dport, unsigned char ch)
677{
678 unsigned long flags;
679 int loops = 2500;
680 unsigned short tmp = ch;
681 /* this code sends stuff out to serial device - spinning its
682 wheels and waiting. */
683
684 spin_lock_irqsave(&dport->port.lock, flags);
685
686 /* spin our wheels */
687 while (((dz_in(dport, DZ_CSR) & DZ_TRDY) != DZ_TRDY) && loops--)
688 /* FIXME: cpu_relax, udelay? --rmk */
689 ;
690
691 /* Actually transmit the character. */
692 dz_out(dport, DZ_TDR, tmp);
693
694 spin_unlock_irqrestore(&dport->port.lock, flags);
695}
fd8c5972 696/*
1da177e4
LT		 697 * -------------------------------------------------------------------
698 * dz_console_print ()
699 *
700 * dz_console_print is registered for printk.
701 * The console must be locked when we get here.
fd8c5972 702 * -------------------------------------------------------------------
1da177e4
LT		 703 */
704static void dz_console_print(struct console *cons,
705 const char *str,
706 unsigned int count)
707{
708 struct dz_port *dport = &dz_ports[CONSOLE_LINE];
709#ifdef DEBUG_DZ
710 prom_printf((char *) str);
711#endif
712 while (count--) {
713 if (*str == '\n')
714 dz_console_put_char(dport, '\r');
715 dz_console_put_char(dport, *str++);
716 }
717}
718
719static int __init dz_console_setup(struct console *co, char *options)
720{
721 struct dz_port *dport = &dz_ports[CONSOLE_LINE];
722 int baud = 9600;
723 int bits = 8;
724 int parity = 'n';
725 int flow = 'n';
726 int ret;
727 unsigned short mask, tmp;
728
729 if (options)
730 uart_parse_options(options, &baud, &parity, &bits, &flow);
731
732 dz_reset(dport);
733
734 ret = uart_set_options(&dport->port, co, baud, parity, bits, flow);
735 if (ret == 0) {
736 mask = 1 << dport->port.line;
737 tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
738 if (!(tmp & mask)) {
739 tmp |= mask; /* set the TX flag */
740 dz_out(dport, DZ_TCR, tmp);
741 }
742 }
743
744 return ret;
745}
746
747static struct console dz_sercons =
748{
749 .name = "ttyS",
750 .write = dz_console_print,
751 .device = uart_console_device,
752 .setup = dz_console_setup,
753 .flags = CON_CONSDEV | CON_PRINTBUFFER,
754 .index = CONSOLE_LINE,
755};
756
757void __init dz_serial_console_init(void)
758{
759 dz_init_ports();
760
761 register_console(&dz_sercons);
762}
763
764#define SERIAL_DZ_CONSOLE &dz_sercons
765#else
766#define SERIAL_DZ_CONSOLE NULL
767#endif /* CONFIG_SERIAL_DZ_CONSOLE */
768
769static struct uart_driver dz_reg = {
770 .owner = THIS_MODULE,
771 .driver_name = "serial",
772#ifdef CONFIG_DEVFS
773 .dev_name = "tts/%d",
774#else
775 .dev_name = "ttyS%d",
776#endif
777 .major = TTY_MAJOR,
778 .minor = 64,
779 .nr = DZ_NB_PORT,
780 .cons = SERIAL_DZ_CONSOLE,
781};
782
783int __init dz_init(void)
784{
785 unsigned long flags;
786 int ret, i;
787
788 printk("%s%s\n", dz_name, dz_version);
789
790 dz_init_ports();
791
792 save_flags(flags);
793 cli();
794
795#ifndef CONFIG_SERIAL_DZ_CONSOLE
796 /* reset the chip */
797 dz_reset(&dz_ports[0]);
798#endif
799
800 /* order matters here... the trick is that flags
801 is updated... in request_irq - to immediatedly obliterate
802 it is unwise. */
803 restore_flags(flags);
804
805 if (request_irq(dz_ports[0].port.irq, dz_interrupt,
806 SA_INTERRUPT, "DZ", &dz_ports[0]))
807 panic("Unable to register DZ interrupt");
808
809 ret = uart_register_driver(&dz_reg);
810 if (ret != 0)
811 return ret;
812
813 for (i = 0; i < DZ_NB_PORT; i++)
814 uart_add_one_port(&dz_reg, &dz_ports[i].port);
815
816 return ret;
817}
818
819MODULE_DESCRIPTION("DECstation DZ serial driver");
820MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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