File: /usr/src/linux/arch/m68k/bvme6000/config.c
1 /*
2 * arch/m68k/bvme6000/config.c
3 *
4 * Copyright (C) 1997 Richard Hirst [richard@sleepie.demon.co.uk]
5 *
6 * Based on:
7 *
8 * linux/amiga/config.c
9 *
10 * Copyright (C) 1993 Hamish Macdonald
11 *
12 * This file is subject to the terms and conditions of the GNU General Public
13 * License. See the file README.legal in the main directory of this archive
14 * for more details.
15 */
16
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/mm.h>
20 #include <linux/tty.h>
21 #include <linux/console.h>
22 #include <linux/linkage.h>
23 #include <linux/init.h>
24 #include <linux/major.h>
25
26 #include <asm/bootinfo.h>
27 #include <asm/system.h>
28 #include <asm/pgtable.h>
29 #include <asm/setup.h>
30 #include <asm/irq.h>
31 #include <asm/traps.h>
32 #include <asm/rtc.h>
33 #include <asm/machdep.h>
34 #include <asm/bvme6000hw.h>
35
36 extern void bvme6000_process_int (int level, struct pt_regs *regs);
37 extern void bvme6000_init_IRQ (void);
38 extern void bvme6000_free_irq (unsigned int, void *);
39 extern int bvme6000_get_irq_list (char *);
40 extern void bvme6000_enable_irq (unsigned int);
41 extern void bvme6000_disable_irq (unsigned int);
42 static void bvme6000_get_model(char *model);
43 static int bvme6000_get_hardware_list(char *buffer);
44 extern int bvme6000_request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
45 extern void bvme6000_sched_init(void (*handler)(int, void *, struct pt_regs *));
46 extern int bvme6000_keyb_init(void);
47 extern int bvme6000_kbdrate (struct kbd_repeat *);
48 extern unsigned long bvme6000_gettimeoffset (void);
49 extern void bvme6000_gettod (int *year, int *mon, int *day, int *hour,
50 int *min, int *sec);
51 extern int bvme6000_hwclk (int, struct hwclk_time *);
52 extern int bvme6000_set_clock_mmss (unsigned long);
53 extern void bvme6000_check_partition (struct gendisk *hd, unsigned int dev);
54 extern void bvme6000_mksound( unsigned int count, unsigned int ticks );
55 extern void bvme6000_reset (void);
56 extern void bvme6000_waitbut(void);
57 void bvme6000_set_vectors (void);
58
59 static unsigned char bcd2bin (unsigned char b);
60 static unsigned char bin2bcd (unsigned char b);
61
62 /* Save tick handler routine pointer, will point to do_timer() in
63 * kernel/sched.c, called via bvme6000_process_int() */
64
65 static void (*tick_handler)(int, void *, struct pt_regs *);
66
67
68 int bvme6000_parse_bootinfo(const struct bi_record *bi)
69 {
70 if (bi->tag == BI_VME_TYPE)
71 return 0;
72 else
73 return 1;
74 }
75
76 int bvme6000_kbdrate (struct kbd_repeat *k)
77 {
78 return 0;
79 }
80
81 void bvme6000_mksound( unsigned int count, unsigned int ticks )
82 {
83 }
84
85 void bvme6000_reset()
86 {
87 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
88
89 printk ("\r\n\nCalled bvme6000_reset\r\n"
90 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
91 /* The string of returns is to delay the reset until the whole
92 * message is output. */
93 /* Enable the watchdog, via PIT port C bit 4 */
94
95 pit->pcddr |= 0x10; /* WDOG enable */
96
97 while(1)
98 ;
99 }
100
101 static void bvme6000_get_model(char *model)
102 {
103 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
104 }
105
106
107 /* No hardware options on BVME6000? */
108
109 static int bvme6000_get_hardware_list(char *buffer)
110 {
111 *buffer = '\0';
112 return 0;
113 }
114
115
116 void __init config_bvme6000(void)
117 {
118 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
119
120 /* Board type is only set by newer versions of vmelilo/tftplilo */
121 if (!vme_brdtype) {
122 if (m68k_cputype == CPU_68060)
123 vme_brdtype = VME_TYPE_BVME6000;
124 else
125 vme_brdtype = VME_TYPE_BVME4000;
126 }
127 #if 0
128 /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
129 * debugger. Note trap_init() will splat the abort vector, but
130 * bvme6000_init_IRQ() will put it back again. Hopefully. */
131
132 bvme6000_set_vectors();
133 #endif
134
135 mach_max_dma_address = 0xffffffff;
136 mach_sched_init = bvme6000_sched_init;
137 mach_keyb_init = bvme6000_keyb_init;
138 mach_kbdrate = bvme6000_kbdrate;
139 mach_init_IRQ = bvme6000_init_IRQ;
140 mach_gettimeoffset = bvme6000_gettimeoffset;
141 mach_gettod = bvme6000_gettod;
142 mach_hwclk = bvme6000_hwclk;
143 mach_set_clock_mmss = bvme6000_set_clock_mmss;
144 /* mach_mksound = bvme6000_mksound; */
145 mach_reset = bvme6000_reset;
146 mach_free_irq = bvme6000_free_irq;
147 mach_process_int = bvme6000_process_int;
148 mach_get_irq_list = bvme6000_get_irq_list;
149 mach_request_irq = bvme6000_request_irq;
150 enable_irq = bvme6000_enable_irq;
151 disable_irq = bvme6000_disable_irq;
152 mach_get_model = bvme6000_get_model;
153 mach_get_hardware_list = bvme6000_get_hardware_list;
154
155 printk ("Board is %sconfigured as a System Controller\n",
156 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
157
158 /* Now do the PIT configuration */
159
160 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */
161 pit->psrr = 0x18; /* PIACK and PIRQ fucntions enabled */
162 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */
163 pit->padr = 0x00; /* Just to be tidy! */
164 pit->paddr = 0x00; /* All inputs for now (safest) */
165 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */
166 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
167 /* PRI, SYSCON?, Level3, SCC clks from xtal */
168 pit->pbddr = 0xf3; /* Mostly outputs */
169 pit->pcdr = 0x01; /* PA transceiver disabled */
170 pit->pcddr = 0x03; /* WDOG disable */
171
172 /* Disable snooping for Ethernet and VME accesses */
173
174 bvme_acr_addrctl = 0;
175 }
176
177
178 void bvme6000_abort_int (int irq, void *dev_id, struct pt_regs *fp)
179 {
180 unsigned long *new = (unsigned long *)vectors;
181 unsigned long *old = (unsigned long *)0xf8000000;
182
183 /* Wait for button release */
184 while (*config_reg_ptr & BVME_ABORT_STATUS)
185 ;
186
187 *(new+4) = *(old+4); /* Illegal instruction */
188 *(new+9) = *(old+9); /* Trace */
189 *(new+47) = *(old+47); /* Trap #15 */
190 *(new+0x1f) = *(old+0x1f); /* ABORT switch */
191 }
192
193
194 static void bvme6000_timer_int (int irq, void *dev_id, struct pt_regs *fp)
195 {
196 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
197 unsigned char msr = rtc->msr & 0xc0;
198
199 rtc->msr = msr | 0x20; /* Ack the interrupt */
200
201 tick_handler(irq, dev_id, fp);
202 }
203
204 /*
205 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
206 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low.
207 * So, when reading the elapsed time, you should read timer1,
208 * subtract it from 39999, and then add 40000 if T1 is high.
209 * That gives you the number of 125ns ticks in to the 10ms period,
210 * so divide by 8 to get the microsecond result.
211 */
212
213 void bvme6000_sched_init (void (*timer_routine)(int, void *, struct pt_regs *))
214 {
215 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
216 unsigned char msr = rtc->msr & 0xc0;
217
218 rtc->msr = 0; /* Ensure timer registers accessible */
219
220 tick_handler = timer_routine;
221 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
222 "timer", bvme6000_timer_int))
223 panic ("Couldn't register timer int");
224
225 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */
226 rtc->t1msb = 39999 >> 8;
227 rtc->t1lsb = 39999 & 0xff;
228 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */
229 rtc->msr = 0x40; /* Access int.cntrl, etc */
230 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */
231 rtc->irr_icr1 = 0;
232 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */
233 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */
234 rtc->msr = 0; /* Access timer 1 control */
235 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */
236
237 rtc->msr = msr;
238
239 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
240 "abort", bvme6000_abort_int))
241 panic ("Couldn't register abort int");
242 }
243
244
245 /* This is always executed with interrupts disabled. */
246
247 /*
248 * NOTE: Don't accept any readings within 5us of rollover, as
249 * the T1INT bit may be a little slow getting set. There is also
250 * a fault in the chip, meaning that reads may produce invalid
251 * results...
252 */
253
254 unsigned long bvme6000_gettimeoffset (void)
255 {
256 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
257 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
258 unsigned char msr = rtc->msr & 0xc0;
259 unsigned char t1int, t1op;
260 unsigned long v = 800000, ov;
261
262 rtc->msr = 0; /* Ensure timer registers accessible */
263
264 do {
265 ov = v;
266 t1int = rtc->msr & 0x20;
267 t1op = pit->pcdr & 0x04;
268 rtc->t1cr_omr |= 0x40; /* Latch timer1 */
269 v = rtc->t1msb << 8; /* Read timer1 */
270 v |= rtc->t1lsb; /* Read timer1 */
271 } while (t1int != (rtc->msr & 0x20) ||
272 t1op != (pit->pcdr & 0x04) ||
273 abs(ov-v) > 80 ||
274 v > 39960);
275
276 v = 39999 - v;
277 if (!t1op) /* If in second half cycle.. */
278 v += 40000;
279 v /= 8; /* Convert ticks to microseconds */
280 if (t1int)
281 v += 10000; /* Int pending, + 10ms */
282 rtc->msr = msr;
283
284 return v;
285 }
286
287 extern void bvme6000_gettod (int *year, int *mon, int *day, int *hour,
288 int *min, int *sec)
289 {
290 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
291 unsigned char msr = rtc->msr & 0xc0;
292
293 rtc->msr = 0; /* Ensure clock accessible */
294
295 do { /* Loop until we get a reading with a stable seconds field */
296 *sec = bcd2bin (rtc->bcd_sec);
297 *min = bcd2bin (rtc->bcd_min);
298 *hour = bcd2bin (rtc->bcd_hr);
299 *day = bcd2bin (rtc->bcd_dom);
300 *mon = bcd2bin (rtc->bcd_mth);
301 *year = bcd2bin (rtc->bcd_year);
302 } while (bcd2bin (rtc->bcd_sec) != *sec);
303
304 rtc->msr = msr;
305 }
306
307 static unsigned char bcd2bin (unsigned char b)
308 {
309 return ((b>>4)*10 + (b&15));
310 }
311
312 static unsigned char bin2bcd (unsigned char b)
313 {
314 return (((b/10)*16) + (b%10));
315 }
316
317
318 /*
319 * Looks like op is non-zero for setting the clock, and zero for
320 * reading the clock.
321 *
322 * struct hwclk_time {
323 * unsigned sec; 0..59
324 * unsigned min; 0..59
325 * unsigned hour; 0..23
326 * unsigned day; 1..31
327 * unsigned mon; 0..11
328 * unsigned year; 00...
329 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set
330 * };
331 */
332
333 int bvme6000_hwclk(int op, struct hwclk_time *t)
334 {
335 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
336 unsigned char msr = rtc->msr & 0xc0;
337
338 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register
339 * are accessible */
340 if (op)
341 { /* Write.... */
342 rtc->t0cr_rtmr = t->year%4;
343 rtc->bcd_tenms = 0;
344 rtc->bcd_sec = bin2bcd(t->sec);
345 rtc->bcd_min = bin2bcd(t->min);
346 rtc->bcd_hr = bin2bcd(t->hour);
347 rtc->bcd_dom = bin2bcd(t->day);
348 rtc->bcd_mth = bin2bcd(t->mon + 1);
349 rtc->bcd_year = bin2bcd(t->year%100);
350 if (t->wday >= 0)
351 rtc->bcd_dow = bin2bcd(t->wday+1);
352 rtc->t0cr_rtmr = t->year%4 | 0x08;
353 }
354 else
355 { /* Read.... */
356 do {
357 t->sec = bcd2bin(rtc->bcd_sec);
358 t->min = bcd2bin(rtc->bcd_min);
359 t->hour = bcd2bin(rtc->bcd_hr);
360 t->day = bcd2bin(rtc->bcd_dom);
361 t->mon = bcd2bin(rtc->bcd_mth)-1;
362 t->year = bcd2bin(rtc->bcd_year);
363 if (t->year < 70)
364 t->year += 100;
365 t->wday = bcd2bin(rtc->bcd_dow)-1;
366 } while (t->sec != bcd2bin(rtc->bcd_sec));
367 }
368
369 rtc->msr = msr;
370
371 return 0;
372 }
373
374 /*
375 * Set the minutes and seconds from seconds value 'nowtime'. Fail if
376 * clock is out by > 30 minutes. Logic lifted from atari code.
377 * Algorithm is to wait for the 10ms register to change, and then to
378 * wait a short while, and then set it.
379 */
380
381 int bvme6000_set_clock_mmss (unsigned long nowtime)
382 {
383 int retval = 0;
384 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
385 unsigned char rtc_minutes, rtc_tenms;
386 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
387 unsigned char msr = rtc->msr & 0xc0;
388 unsigned long flags;
389 volatile int i;
390
391 rtc->msr = 0; /* Ensure clock accessible */
392 rtc_minutes = bcd2bin (rtc->bcd_min);
393
394 if ((rtc_minutes < real_minutes
395 ? real_minutes - rtc_minutes
396 : rtc_minutes - real_minutes) < 30)
397 {
398 save_flags(flags);
399 cli();
400 rtc_tenms = rtc->bcd_tenms;
401 while (rtc_tenms == rtc->bcd_tenms)
402 ;
403 for (i = 0; i < 1000; i++)
404 ;
405 rtc->bcd_min = bin2bcd(real_minutes);
406 rtc->bcd_sec = bin2bcd(real_seconds);
407 restore_flags(flags);
408 }
409 else
410 retval = -1;
411
412 rtc->msr = msr;
413
414 return retval;
415 }
416
417
418 int bvme6000_keyb_init (void)
419 {
420 return 0;
421 }
422
423 /*------------------- Serial console stuff ------------------------*/
424
425 static void bvme_scc_write(struct console *co, const char *str, unsigned cnt);
426
427
428 void bvme6000_init_console_port (struct console *co, int cflag)
429 {
430 co->write = bvme_scc_write;
431 }
432
433
434 static void scc_delay (void)
435 {
436 int n;
437 volatile int trash;
438
439 for (n = 0; n < 20; n++)
440 trash = n;
441 }
442
443 static void scc_write (char ch)
444 {
445 volatile char *p = (volatile char *)BVME_SCC_A_ADDR;
446
447 do {
448 scc_delay();
449 }
450 while (!(*p & 4));
451 scc_delay();
452 *p = 8;
453 scc_delay();
454 *p = ch;
455 }
456
457
458 static void bvme_scc_write (struct console *co, const char *str, unsigned count)
459 {
460 unsigned long flags;
461
462 save_flags(flags);
463 cli();
464
465 while (count--)
466 {
467 if (*str == '\n')
468 scc_write ('\r');
469 scc_write (*str++);
470 }
471 restore_flags(flags);
472 }
473
474