Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * dz.c: Serial port driver for DECStations equiped | |
3 | * with the DZ chipset. | |
4 | * | |
5 | * Copyright (C) 1998 Olivier A. D. Lebaillif | |
6 | * | |
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 | |
14 | * after patches by harald to irq code. | |
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 | |
19 | * | |
20 | * Parts (C) 1999 David Airlie, airlied@linux.ie | |
21 | * [07-SEP-99] Bugfixes | |
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 | ||
55 | static char *dz_name = "DECstation DZ serial driver version "; | |
56 | static char *dz_version = "1.02"; | |
57 | ||
58 | struct dz_port { | |
59 | struct uart_port port; | |
60 | unsigned int cflag; | |
61 | }; | |
62 | ||
63 | static struct dz_port dz_ports[DZ_NB_PORT]; | |
64 | ||
65 | #ifdef DEBUG_DZ | |
66 | /* | |
67 | * debugging code to send out chars via prom | |
68 | */ | |
69 | static 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 | * | |
85 | * These routines are used to access the registers of the DZ | |
86 | * chip, hiding relocation differences between implementation. | |
87 | * ------------------------------------------------------------ | |
88 | */ | |
89 | ||
90 | static 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 | ||
97 | static 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 | * | |
109 | * These routines are called before setting or resetting | |
110 | * tty->stopped. They enable or disable transmitter interrupts, | |
111 | * as necessary. | |
112 | * ------------------------------------------------------------ | |
113 | */ | |
114 | ||
115 | static void dz_stop_tx(struct uart_port *uport, unsigned int tty_stop) | |
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 | ||
128 | static void dz_start_tx(struct uart_port *uport, unsigned int tty_start) | |
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 | ||
141 | static 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 | ||
152 | static void dz_enable_ms(struct uart_port *port) | |
153 | { | |
154 | /* nothing to do */ | |
155 | } | |
156 | ||
157 | /* | |
158 | * ------------------------------------------------------------ | |
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. | |
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: | |
169 | * | |
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 | */ | |
184 | static 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; | |
219 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) | |
220 | break; | |
221 | ||
222 | icount->rx++; | |
223 | ||
224 | /* keep track of the statistics */ | |
225 | if (status & (DZ_OERR | DZ_FERR | DZ_PERR)) { | |
226 | if (status & DZ_PERR) /* parity error */ | |
227 | icount->parity++; | |
228 | else if (status & DZ_FERR) /* frame error */ | |
229 | icount->frame++; | |
230 | if (status & DZ_OERR) /* overrun error */ | |
231 | icount->overrun++; | |
232 | ||
233 | /* check to see if we should ignore the character | |
234 | and mask off conditions that should be ignored | |
235 | */ | |
236 | ||
237 | if (status & dport->port.ignore_status_mask) { | |
238 | if (++ignore > 100) | |
239 | break; | |
240 | goto ignore_char; | |
241 | } | |
242 | /* mask off the error conditions we want to ignore */ | |
243 | tmp = status & dport->port.read_status_mask; | |
244 | ||
245 | if (tmp & DZ_PERR) { | |
246 | flag = TTY_PARITY; | |
247 | #ifdef DEBUG_DZ | |
248 | debug_console("PERR\n", 5); | |
249 | #endif | |
250 | } else if (tmp & DZ_FERR) { | |
251 | flag = TTY_FRAME; | |
252 | #ifdef DEBUG_DZ | |
253 | debug_console("FERR\n", 5); | |
254 | #endif | |
255 | } | |
256 | if (tmp & DZ_OERR) { | |
257 | #ifdef DEBUG_DZ | |
258 | debug_console("OERR\n", 5); | |
259 | #endif | |
260 | tty_insert_flip_char(tty, ch, flag); | |
261 | ch = 0; | |
262 | flag = TTY_OVERRUN; | |
263 | } | |
264 | } | |
265 | tty_insert_flip_char(tty, ch, flag); | |
266 | ignore_char: | |
267 | } while (status & DZ_DVAL); | |
268 | ||
269 | if (tty) | |
270 | tty_flip_buffer_push(tty); | |
271 | } | |
272 | ||
273 | /* | |
274 | * ------------------------------------------------------------ | |
275 | * transmit_char () | |
276 | * | |
277 | * This routine deals with outputs to any lines. | |
278 | * ------------------------------------------------------------ | |
279 | */ | |
280 | static inline void dz_transmit_chars(struct dz_port *dport) | |
281 | { | |
282 | struct circ_buf *xmit = &dport->port.info->xmit; | |
283 | unsigned char tmp; | |
284 | ||
285 | if (dport->port.x_char) { /* XON/XOFF chars */ | |
286 | dz_out(dport, DZ_TDR, dport->port.x_char); | |
287 | dport->port.icount.tx++; | |
288 | dport->port.x_char = 0; | |
289 | return; | |
290 | } | |
291 | /* if nothing to do or stopped or hardware stopped */ | |
292 | if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) { | |
293 | dz_stop_tx(&dport->port, 0); | |
294 | return; | |
295 | } | |
296 | ||
297 | /* | |
298 | * if something to do ... (rember the dz has no output fifo so we go | |
299 | * one char at a time :-< | |
300 | */ | |
301 | tmp = xmit->buf[xmit->tail]; | |
302 | xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1); | |
303 | dz_out(dport, DZ_TDR, tmp); | |
304 | dport->port.icount.tx++; | |
305 | ||
306 | if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS) | |
307 | uart_write_wakeup(&dport->port); | |
308 | ||
309 | /* Are we done */ | |
310 | if (uart_circ_empty(xmit)) | |
311 | dz_stop_tx(&dport->port, 0); | |
312 | } | |
313 | ||
314 | /* | |
315 | * ------------------------------------------------------------ | |
316 | * check_modem_status () | |
317 | * | |
318 | * Only valid for the MODEM line duh ! | |
319 | * ------------------------------------------------------------ | |
320 | */ | |
321 | static inline void check_modem_status(struct dz_port *dport) | |
322 | { | |
323 | unsigned short status; | |
324 | ||
325 | /* if not ne modem line just return */ | |
326 | if (dport->port.line != DZ_MODEM) | |
327 | return; | |
328 | ||
329 | status = dz_in(dport, DZ_MSR); | |
330 | ||
331 | /* it's easy, since DSR2 is the only bit in the register */ | |
332 | if (status) | |
333 | dport->port.icount.dsr++; | |
334 | } | |
335 | ||
336 | /* | |
337 | * ------------------------------------------------------------ | |
338 | * dz_interrupt () | |
339 | * | |
340 | * this is the main interrupt routine for the DZ chip. | |
341 | * It deals with the multiple ports. | |
342 | * ------------------------------------------------------------ | |
343 | */ | |
344 | static irqreturn_t dz_interrupt(int irq, void *dev, struct pt_regs *regs) | |
345 | { | |
346 | struct dz_port *dport; | |
347 | unsigned short status; | |
348 | ||
349 | /* get the reason why we just got an irq */ | |
350 | status = dz_in((struct dz_port *)dev, DZ_CSR); | |
351 | dport = &dz_ports[LINE(status)]; | |
352 | ||
353 | if (status & DZ_RDONE) | |
354 | dz_receive_chars(dport); | |
355 | ||
356 | if (status & DZ_TRDY) | |
357 | dz_transmit_chars(dport); | |
358 | ||
359 | /* FIXME: what about check modem status??? --rmk */ | |
360 | ||
361 | return IRQ_HANDLED; | |
362 | } | |
363 | ||
364 | /* | |
365 | * ------------------------------------------------------------------- | |
366 | * Here ends the DZ interrupt routines. | |
367 | * ------------------------------------------------------------------- | |
368 | */ | |
369 | ||
370 | static unsigned int dz_get_mctrl(struct uart_port *uport) | |
371 | { | |
372 | struct dz_port *dport = (struct dz_port *)uport; | |
373 | unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; | |
374 | ||
375 | if (dport->port.line == DZ_MODEM) { | |
376 | /* | |
377 | * CHECKME: This is a guess from the other code... --rmk | |
378 | */ | |
379 | if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR) | |
380 | mctrl &= ~TIOCM_DSR; | |
381 | } | |
382 | ||
383 | return mctrl; | |
384 | } | |
385 | ||
386 | static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl) | |
387 | { | |
388 | struct dz_port *dport = (struct dz_port *)uport; | |
389 | unsigned short tmp; | |
390 | ||
391 | if (dport->port.line == DZ_MODEM) { | |
392 | tmp = dz_in(dport, DZ_TCR); | |
393 | if (mctrl & TIOCM_DTR) | |
394 | tmp &= ~DZ_MODEM_DTR; | |
395 | else | |
396 | tmp |= DZ_MODEM_DTR; | |
397 | dz_out(dport, DZ_TCR, tmp); | |
398 | } | |
399 | } | |
400 | ||
401 | /* | |
402 | * ------------------------------------------------------------------- | |
403 | * startup () | |
404 | * | |
405 | * various initialization tasks | |
406 | * ------------------------------------------------------------------- | |
407 | */ | |
408 | static int dz_startup(struct uart_port *uport) | |
409 | { | |
410 | struct dz_port *dport = (struct dz_port *)uport; | |
411 | unsigned long flags; | |
412 | unsigned short tmp; | |
413 | ||
414 | /* The dz lines for the mouse/keyboard must be | |
415 | * opened using their respective drivers. | |
416 | */ | |
417 | if ((dport->port.line == DZ_KEYBOARD) || | |
418 | (dport->port.line == DZ_MOUSE)) | |
419 | return -ENODEV; | |
420 | ||
421 | spin_lock_irqsave(&dport->port.lock, flags); | |
422 | ||
423 | /* enable the interrupt and the scanning */ | |
424 | tmp = dz_in(dport, DZ_CSR); | |
425 | tmp |= DZ_RIE | DZ_TIE | DZ_MSE; | |
426 | dz_out(dport, DZ_CSR, tmp); | |
427 | ||
428 | spin_unlock_irqrestore(&dport->port.lock, flags); | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | /* | |
434 | * ------------------------------------------------------------------- | |
435 | * shutdown () | |
436 | * | |
437 | * This routine will shutdown a serial port; interrupts are disabled, and | |
438 | * DTR is dropped if the hangup on close termio flag is on. | |
439 | * ------------------------------------------------------------------- | |
440 | */ | |
441 | static void dz_shutdown(struct uart_port *uport) | |
442 | { | |
443 | dz_stop_tx(uport, 0); | |
444 | } | |
445 | ||
446 | /* | |
447 | * get_lsr_info - get line status register info | |
448 | * | |
449 | * Purpose: Let user call ioctl() to get info when the UART physically | |
450 | * is emptied. On bus types like RS485, the transmitter must | |
451 | * release the bus after transmitting. This must be done when | |
452 | * the transmit shift register is empty, not be done when the | |
453 | * transmit holding register is empty. This functionality | |
454 | * allows an RS485 driver to be written in user space. | |
455 | */ | |
456 | static unsigned int dz_tx_empty(struct uart_port *uport) | |
457 | { | |
458 | struct dz_port *dport = (struct dz_port *)uport; | |
459 | unsigned short status = dz_in(dport, DZ_LPR); | |
460 | ||
461 | /* FIXME: this appears to be obviously broken --rmk. */ | |
462 | return status ? TIOCSER_TEMT : 0; | |
463 | } | |
464 | ||
465 | static void dz_break_ctl(struct uart_port *uport, int break_state) | |
466 | { | |
467 | struct dz_port *dport = (struct dz_port *)uport; | |
468 | unsigned long flags; | |
469 | unsigned short tmp, mask = 1 << uport->line; | |
470 | ||
471 | spin_lock_irqsave(&uport->lock, flags); | |
472 | tmp = dz_in(dport, DZ_TCR); | |
473 | if (break_state) | |
474 | tmp |= mask; | |
475 | else | |
476 | tmp &= ~mask; | |
477 | dz_out(dport, DZ_TCR, tmp); | |
478 | spin_unlock_irqrestore(&uport->lock, flags); | |
479 | } | |
480 | ||
481 | static void dz_set_termios(struct uart_port *uport, struct termios *termios, | |
482 | struct termios *old_termios) | |
483 | { | |
484 | struct dz_port *dport = (struct dz_port *)uport; | |
485 | unsigned long flags; | |
486 | unsigned int cflag, baud; | |
487 | ||
488 | cflag = dport->port.line; | |
489 | ||
490 | switch (termios->c_cflag & CSIZE) { | |
491 | case CS5: | |
492 | cflag |= DZ_CS5; | |
493 | break; | |
494 | case CS6: | |
495 | cflag |= DZ_CS6; | |
496 | break; | |
497 | case CS7: | |
498 | cflag |= DZ_CS7; | |
499 | break; | |
500 | case CS8: | |
501 | default: | |
502 | cflag |= DZ_CS8; | |
503 | } | |
504 | ||
505 | if (termios->c_cflag & CSTOPB) | |
506 | cflag |= DZ_CSTOPB; | |
507 | if (termios->c_cflag & PARENB) | |
508 | cflag |= DZ_PARENB; | |
509 | if (termios->c_cflag & PARODD) | |
510 | cflag |= DZ_PARODD; | |
511 | ||
512 | baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600); | |
513 | switch (baud) { | |
514 | case 50: | |
515 | cflag |= DZ_B50; | |
516 | break; | |
517 | case 75: | |
518 | cflag |= DZ_B75; | |
519 | break; | |
520 | case 110: | |
521 | cflag |= DZ_B110; | |
522 | break; | |
523 | case 134: | |
524 | cflag |= DZ_B134; | |
525 | break; | |
526 | case 150: | |
527 | cflag |= DZ_B150; | |
528 | break; | |
529 | case 300: | |
530 | cflag |= DZ_B300; | |
531 | break; | |
532 | case 600: | |
533 | cflag |= DZ_B600; | |
534 | break; | |
535 | case 1200: | |
536 | cflag |= DZ_B1200; | |
537 | break; | |
538 | case 1800: | |
539 | cflag |= DZ_B1800; | |
540 | break; | |
541 | case 2000: | |
542 | cflag |= DZ_B2000; | |
543 | break; | |
544 | case 2400: | |
545 | cflag |= DZ_B2400; | |
546 | break; | |
547 | case 3600: | |
548 | cflag |= DZ_B3600; | |
549 | break; | |
550 | case 4800: | |
551 | cflag |= DZ_B4800; | |
552 | break; | |
553 | case 7200: | |
554 | cflag |= DZ_B7200; | |
555 | break; | |
556 | case 9600: | |
557 | default: | |
558 | cflag |= DZ_B9600; | |
559 | } | |
560 | ||
561 | if (termios->c_cflag & CREAD) | |
562 | cflag |= DZ_RXENAB; | |
563 | ||
564 | spin_lock_irqsave(&dport->port.lock, flags); | |
565 | ||
566 | dz_out(dport, DZ_LPR, cflag); | |
567 | dport->cflag = cflag; | |
568 | ||
569 | /* setup accept flag */ | |
570 | dport->port.read_status_mask = DZ_OERR; | |
571 | if (termios->c_iflag & INPCK) | |
572 | dport->port.read_status_mask |= DZ_FERR | DZ_PERR; | |
573 | ||
574 | /* characters to ignore */ | |
575 | uport->ignore_status_mask = 0; | |
576 | if (termios->c_iflag & IGNPAR) | |
577 | dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR; | |
578 | ||
579 | spin_unlock_irqrestore(&dport->port.lock, flags); | |
580 | } | |
581 | ||
582 | static const char *dz_type(struct uart_port *port) | |
583 | { | |
584 | return "DZ"; | |
585 | } | |
586 | ||
587 | static void dz_release_port(struct uart_port *port) | |
588 | { | |
589 | /* nothing to do */ | |
590 | } | |
591 | ||
592 | static int dz_request_port(struct uart_port *port) | |
593 | { | |
594 | return 0; | |
595 | } | |
596 | ||
597 | static void dz_config_port(struct uart_port *port, int flags) | |
598 | { | |
599 | if (flags & UART_CONFIG_TYPE) | |
600 | port->type = PORT_DZ; | |
601 | } | |
602 | ||
603 | /* | |
604 | * verify the new serial_struct (for TIOCSSERIAL). | |
605 | */ | |
606 | static int dz_verify_port(struct uart_port *port, struct serial_struct *ser) | |
607 | { | |
608 | int ret = 0; | |
609 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ) | |
610 | ret = -EINVAL; | |
611 | if (ser->irq != port->irq) | |
612 | ret = -EINVAL; | |
613 | return ret; | |
614 | } | |
615 | ||
616 | static struct uart_ops dz_ops = { | |
617 | .tx_empty = dz_tx_empty, | |
618 | .get_mctrl = dz_get_mctrl, | |
619 | .set_mctrl = dz_set_mctrl, | |
620 | .stop_tx = dz_stop_tx, | |
621 | .start_tx = dz_start_tx, | |
622 | .stop_rx = dz_stop_rx, | |
623 | .enable_ms = dz_enable_ms, | |
624 | .break_ctl = dz_break_ctl, | |
625 | .startup = dz_startup, | |
626 | .shutdown = dz_shutdown, | |
627 | .set_termios = dz_set_termios, | |
628 | .type = dz_type, | |
629 | .release_port = dz_release_port, | |
630 | .request_port = dz_request_port, | |
631 | .config_port = dz_config_port, | |
632 | .verify_port = dz_verify_port, | |
633 | }; | |
634 | ||
635 | static void __init dz_init_ports(void) | |
636 | { | |
637 | static int first = 1; | |
638 | struct dz_port *dport; | |
639 | unsigned long base; | |
640 | int i; | |
641 | ||
642 | if (!first) | |
643 | return; | |
644 | first = 0; | |
645 | ||
646 | if (mips_machtype == MACH_DS23100 || | |
647 | mips_machtype == MACH_DS5100) | |
648 | base = (unsigned long) KN01_DZ11_BASE; | |
649 | else | |
650 | base = (unsigned long) KN02_DZ11_BASE; | |
651 | ||
652 | for (i = 0, dport = dz_ports; i < DZ_NB_PORT; i++, dport++) { | |
653 | spin_lock_init(&dport->port.lock); | |
654 | dport->port.membase = (char *) base; | |
655 | dport->port.iotype = SERIAL_IO_PORT; | |
656 | dport->port.irq = dec_interrupt[DEC_IRQ_DZ11]; | |
657 | dport->port.line = i; | |
658 | dport->port.fifosize = 1; | |
659 | dport->port.ops = &dz_ops; | |
660 | dport->port.flags = UPF_BOOT_AUTOCONF; | |
661 | } | |
662 | } | |
663 | ||
664 | static void dz_reset(struct dz_port *dport) | |
665 | { | |
666 | dz_out(dport, DZ_CSR, DZ_CLR); | |
667 | ||
668 | while (dz_in(dport, DZ_CSR) & DZ_CLR); | |
669 | /* FIXME: cpu_relax? */ | |
670 | ||
671 | iob(); | |
672 | ||
673 | /* enable scanning */ | |
674 | dz_out(dport, DZ_CSR, DZ_MSE); | |
675 | } | |
676 | ||
677 | #ifdef CONFIG_SERIAL_DZ_CONSOLE | |
678 | static void dz_console_put_char(struct dz_port *dport, unsigned char ch) | |
679 | { | |
680 | unsigned long flags; | |
681 | int loops = 2500; | |
682 | unsigned short tmp = ch; | |
683 | /* this code sends stuff out to serial device - spinning its | |
684 | wheels and waiting. */ | |
685 | ||
686 | spin_lock_irqsave(&dport->port.lock, flags); | |
687 | ||
688 | /* spin our wheels */ | |
689 | while (((dz_in(dport, DZ_CSR) & DZ_TRDY) != DZ_TRDY) && loops--) | |
690 | /* FIXME: cpu_relax, udelay? --rmk */ | |
691 | ; | |
692 | ||
693 | /* Actually transmit the character. */ | |
694 | dz_out(dport, DZ_TDR, tmp); | |
695 | ||
696 | spin_unlock_irqrestore(&dport->port.lock, flags); | |
697 | } | |
698 | /* | |
699 | * ------------------------------------------------------------------- | |
700 | * dz_console_print () | |
701 | * | |
702 | * dz_console_print is registered for printk. | |
703 | * The console must be locked when we get here. | |
704 | * ------------------------------------------------------------------- | |
705 | */ | |
706 | static void dz_console_print(struct console *cons, | |
707 | const char *str, | |
708 | unsigned int count) | |
709 | { | |
710 | struct dz_port *dport = &dz_ports[CONSOLE_LINE]; | |
711 | #ifdef DEBUG_DZ | |
712 | prom_printf((char *) str); | |
713 | #endif | |
714 | while (count--) { | |
715 | if (*str == '\n') | |
716 | dz_console_put_char(dport, '\r'); | |
717 | dz_console_put_char(dport, *str++); | |
718 | } | |
719 | } | |
720 | ||
721 | static int __init dz_console_setup(struct console *co, char *options) | |
722 | { | |
723 | struct dz_port *dport = &dz_ports[CONSOLE_LINE]; | |
724 | int baud = 9600; | |
725 | int bits = 8; | |
726 | int parity = 'n'; | |
727 | int flow = 'n'; | |
728 | int ret; | |
729 | unsigned short mask, tmp; | |
730 | ||
731 | if (options) | |
732 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
733 | ||
734 | dz_reset(dport); | |
735 | ||
736 | ret = uart_set_options(&dport->port, co, baud, parity, bits, flow); | |
737 | if (ret == 0) { | |
738 | mask = 1 << dport->port.line; | |
739 | tmp = dz_in(dport, DZ_TCR); /* read the TX flag */ | |
740 | if (!(tmp & mask)) { | |
741 | tmp |= mask; /* set the TX flag */ | |
742 | dz_out(dport, DZ_TCR, tmp); | |
743 | } | |
744 | } | |
745 | ||
746 | return ret; | |
747 | } | |
748 | ||
749 | static struct console dz_sercons = | |
750 | { | |
751 | .name = "ttyS", | |
752 | .write = dz_console_print, | |
753 | .device = uart_console_device, | |
754 | .setup = dz_console_setup, | |
755 | .flags = CON_CONSDEV | CON_PRINTBUFFER, | |
756 | .index = CONSOLE_LINE, | |
757 | }; | |
758 | ||
759 | void __init dz_serial_console_init(void) | |
760 | { | |
761 | dz_init_ports(); | |
762 | ||
763 | register_console(&dz_sercons); | |
764 | } | |
765 | ||
766 | #define SERIAL_DZ_CONSOLE &dz_sercons | |
767 | #else | |
768 | #define SERIAL_DZ_CONSOLE NULL | |
769 | #endif /* CONFIG_SERIAL_DZ_CONSOLE */ | |
770 | ||
771 | static struct uart_driver dz_reg = { | |
772 | .owner = THIS_MODULE, | |
773 | .driver_name = "serial", | |
774 | #ifdef CONFIG_DEVFS | |
775 | .dev_name = "tts/%d", | |
776 | #else | |
777 | .dev_name = "ttyS%d", | |
778 | #endif | |
779 | .major = TTY_MAJOR, | |
780 | .minor = 64, | |
781 | .nr = DZ_NB_PORT, | |
782 | .cons = SERIAL_DZ_CONSOLE, | |
783 | }; | |
784 | ||
785 | int __init dz_init(void) | |
786 | { | |
787 | unsigned long flags; | |
788 | int ret, i; | |
789 | ||
790 | printk("%s%s\n", dz_name, dz_version); | |
791 | ||
792 | dz_init_ports(); | |
793 | ||
794 | save_flags(flags); | |
795 | cli(); | |
796 | ||
797 | #ifndef CONFIG_SERIAL_DZ_CONSOLE | |
798 | /* reset the chip */ | |
799 | dz_reset(&dz_ports[0]); | |
800 | #endif | |
801 | ||
802 | /* order matters here... the trick is that flags | |
803 | is updated... in request_irq - to immediatedly obliterate | |
804 | it is unwise. */ | |
805 | restore_flags(flags); | |
806 | ||
807 | if (request_irq(dz_ports[0].port.irq, dz_interrupt, | |
808 | SA_INTERRUPT, "DZ", &dz_ports[0])) | |
809 | panic("Unable to register DZ interrupt"); | |
810 | ||
811 | ret = uart_register_driver(&dz_reg); | |
812 | if (ret != 0) | |
813 | return ret; | |
814 | ||
815 | for (i = 0; i < DZ_NB_PORT; i++) | |
816 | uart_add_one_port(&dz_reg, &dz_ports[i].port); | |
817 | ||
818 | return ret; | |
819 | } | |
820 | ||
821 | MODULE_DESCRIPTION("DECstation DZ serial driver"); | |
822 | MODULE_LICENSE("GPL"); |