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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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#include <linux/genhd.h>
26#include <linux/rtc.h>
27#include <linux/interrupt.h>
28
29#include <asm/bootinfo.h>
30#include <asm/system.h>
31#include <asm/pgtable.h>
32#include <asm/setup.h>
33#include <asm/irq.h>
34#include <asm/traps.h>
35#include <asm/rtc.h>
36#include <asm/machdep.h>
37#include <asm/bvme6000hw.h>
38
39extern irqreturn_t bvme6000_process_int (int level, struct pt_regs *regs);
40extern void bvme6000_init_IRQ (void);
41extern void bvme6000_free_irq (unsigned int, void *);
42extern int show_bvme6000_interrupts(struct seq_file *, void *);
43extern void bvme6000_enable_irq (unsigned int);
44extern void bvme6000_disable_irq (unsigned int);
45static void bvme6000_get_model(char *model);
46static int bvme6000_get_hardware_list(char *buffer);
47extern int bvme6000_request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
48extern void bvme6000_sched_init(irqreturn_t (*handler)(int, void *, struct pt_regs *));
49extern unsigned long bvme6000_gettimeoffset (void);
50extern int bvme6000_hwclk (int, struct rtc_time *);
51extern int bvme6000_set_clock_mmss (unsigned long);
52extern void bvme6000_reset (void);
53extern void bvme6000_waitbut(void);
54void bvme6000_set_vectors (void);
55
56static unsigned char bcd2bin (unsigned char b);
57static unsigned char bin2bcd (unsigned char b);
58
59/* Save tick handler routine pointer, will point to do_timer() in
60 * kernel/sched.c, called via bvme6000_process_int() */
61
62static irqreturn_t (*tick_handler)(int, void *, struct pt_regs *);
63
64
65int bvme6000_parse_bootinfo(const struct bi_record *bi)
66{
67 if (bi->tag == BI_VME_TYPE)
68 return 0;
69 else
70 return 1;
71}
72
73void bvme6000_reset(void)
74{
75 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
76
77 printk ("\r\n\nCalled bvme6000_reset\r\n"
78 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
79 /* The string of returns is to delay the reset until the whole
80 * message is output. */
81 /* Enable the watchdog, via PIT port C bit 4 */
82
83 pit->pcddr |= 0x10; /* WDOG enable */
84
85 while(1)
86 ;
87}
88
89static void bvme6000_get_model(char *model)
90{
91 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
92}
93
94
95/* No hardware options on BVME6000? */
96
97static int bvme6000_get_hardware_list(char *buffer)
98{
99 *buffer = '\0';
100 return 0;
101}
102
103
104void __init config_bvme6000(void)
105{
106 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
107
108 /* Board type is only set by newer versions of vmelilo/tftplilo */
109 if (!vme_brdtype) {
110 if (m68k_cputype == CPU_68060)
111 vme_brdtype = VME_TYPE_BVME6000;
112 else
113 vme_brdtype = VME_TYPE_BVME4000;
114 }
115#if 0
116 /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
117 * debugger. Note trap_init() will splat the abort vector, but
118 * bvme6000_init_IRQ() will put it back again. Hopefully. */
119
120 bvme6000_set_vectors();
121#endif
122
123 mach_max_dma_address = 0xffffffff;
124 mach_sched_init = bvme6000_sched_init;
125 mach_init_IRQ = bvme6000_init_IRQ;
126 mach_gettimeoffset = bvme6000_gettimeoffset;
127 mach_hwclk = bvme6000_hwclk;
128 mach_set_clock_mmss = bvme6000_set_clock_mmss;
129 mach_reset = bvme6000_reset;
130 mach_free_irq = bvme6000_free_irq;
131 mach_process_int = bvme6000_process_int;
132 mach_get_irq_list = show_bvme6000_interrupts;
133 mach_request_irq = bvme6000_request_irq;
134 enable_irq = bvme6000_enable_irq;
135 disable_irq = bvme6000_disable_irq;
136 mach_get_model = bvme6000_get_model;
137 mach_get_hardware_list = bvme6000_get_hardware_list;
138
139 printk ("Board is %sconfigured as a System Controller\n",
140 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
141
142 /* Now do the PIT configuration */
143
144 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */
Akinobu Mita0b280022006-03-26 01:38:58 -0800145 pit->psrr = 0x18; /* PIACK and PIRQ functions enabled */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */
147 pit->padr = 0x00; /* Just to be tidy! */
148 pit->paddr = 0x00; /* All inputs for now (safest) */
149 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */
150 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
151 /* PRI, SYSCON?, Level3, SCC clks from xtal */
152 pit->pbddr = 0xf3; /* Mostly outputs */
153 pit->pcdr = 0x01; /* PA transceiver disabled */
154 pit->pcddr = 0x03; /* WDOG disable */
155
156 /* Disable snooping for Ethernet and VME accesses */
157
158 bvme_acr_addrctl = 0;
159}
160
161
162irqreturn_t bvme6000_abort_int (int irq, void *dev_id, struct pt_regs *fp)
163{
164 unsigned long *new = (unsigned long *)vectors;
165 unsigned long *old = (unsigned long *)0xf8000000;
166
167 /* Wait for button release */
168 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS)
169 ;
170
171 *(new+4) = *(old+4); /* Illegal instruction */
172 *(new+9) = *(old+9); /* Trace */
173 *(new+47) = *(old+47); /* Trap #15 */
174 *(new+0x1f) = *(old+0x1f); /* ABORT switch */
175 return IRQ_HANDLED;
176}
177
178
179static irqreturn_t bvme6000_timer_int (int irq, void *dev_id, struct pt_regs *fp)
180{
181 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
182 unsigned char msr = rtc->msr & 0xc0;
183
184 rtc->msr = msr | 0x20; /* Ack the interrupt */
185
186 return tick_handler(irq, dev_id, fp);
187}
188
189/*
190 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
191 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low.
192 * So, when reading the elapsed time, you should read timer1,
193 * subtract it from 39999, and then add 40000 if T1 is high.
194 * That gives you the number of 125ns ticks in to the 10ms period,
195 * so divide by 8 to get the microsecond result.
196 */
197
198void bvme6000_sched_init (irqreturn_t (*timer_routine)(int, void *, struct pt_regs *))
199{
200 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
201 unsigned char msr = rtc->msr & 0xc0;
202
203 rtc->msr = 0; /* Ensure timer registers accessible */
204
205 tick_handler = timer_routine;
206 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
207 "timer", bvme6000_timer_int))
208 panic ("Couldn't register timer int");
209
210 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */
211 rtc->t1msb = 39999 >> 8;
212 rtc->t1lsb = 39999 & 0xff;
213 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */
214 rtc->msr = 0x40; /* Access int.cntrl, etc */
215 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */
216 rtc->irr_icr1 = 0;
217 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */
218 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */
219 rtc->msr = 0; /* Access timer 1 control */
220 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */
221
222 rtc->msr = msr;
223
224 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
225 "abort", bvme6000_abort_int))
226 panic ("Couldn't register abort int");
227}
228
229
230/* This is always executed with interrupts disabled. */
231
232/*
233 * NOTE: Don't accept any readings within 5us of rollover, as
234 * the T1INT bit may be a little slow getting set. There is also
235 * a fault in the chip, meaning that reads may produce invalid
236 * results...
237 */
238
239unsigned long bvme6000_gettimeoffset (void)
240{
241 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
242 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
243 unsigned char msr = rtc->msr & 0xc0;
244 unsigned char t1int, t1op;
245 unsigned long v = 800000, ov;
246
247 rtc->msr = 0; /* Ensure timer registers accessible */
248
249 do {
250 ov = v;
251 t1int = rtc->msr & 0x20;
252 t1op = pit->pcdr & 0x04;
253 rtc->t1cr_omr |= 0x40; /* Latch timer1 */
254 v = rtc->t1msb << 8; /* Read timer1 */
255 v |= rtc->t1lsb; /* Read timer1 */
256 } while (t1int != (rtc->msr & 0x20) ||
257 t1op != (pit->pcdr & 0x04) ||
258 abs(ov-v) > 80 ||
259 v > 39960);
260
261 v = 39999 - v;
262 if (!t1op) /* If in second half cycle.. */
263 v += 40000;
264 v /= 8; /* Convert ticks to microseconds */
265 if (t1int)
266 v += 10000; /* Int pending, + 10ms */
267 rtc->msr = msr;
268
269 return v;
270}
271
272static unsigned char bcd2bin (unsigned char b)
273{
274 return ((b>>4)*10 + (b&15));
275}
276
277static unsigned char bin2bcd (unsigned char b)
278{
279 return (((b/10)*16) + (b%10));
280}
281
282
283/*
284 * Looks like op is non-zero for setting the clock, and zero for
285 * reading the clock.
286 *
287 * struct hwclk_time {
288 * unsigned sec; 0..59
289 * unsigned min; 0..59
290 * unsigned hour; 0..23
291 * unsigned day; 1..31
292 * unsigned mon; 0..11
293 * unsigned year; 00...
294 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set
295 * };
296 */
297
298int bvme6000_hwclk(int op, struct rtc_time *t)
299{
300 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
301 unsigned char msr = rtc->msr & 0xc0;
302
303 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register
304 * are accessible */
305 if (op)
306 { /* Write.... */
307 rtc->t0cr_rtmr = t->tm_year%4;
308 rtc->bcd_tenms = 0;
309 rtc->bcd_sec = bin2bcd(t->tm_sec);
310 rtc->bcd_min = bin2bcd(t->tm_min);
311 rtc->bcd_hr = bin2bcd(t->tm_hour);
312 rtc->bcd_dom = bin2bcd(t->tm_mday);
313 rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
314 rtc->bcd_year = bin2bcd(t->tm_year%100);
315 if (t->tm_wday >= 0)
316 rtc->bcd_dow = bin2bcd(t->tm_wday+1);
317 rtc->t0cr_rtmr = t->tm_year%4 | 0x08;
318 }
319 else
320 { /* Read.... */
321 do {
322 t->tm_sec = bcd2bin(rtc->bcd_sec);
323 t->tm_min = bcd2bin(rtc->bcd_min);
324 t->tm_hour = bcd2bin(rtc->bcd_hr);
325 t->tm_mday = bcd2bin(rtc->bcd_dom);
326 t->tm_mon = bcd2bin(rtc->bcd_mth)-1;
327 t->tm_year = bcd2bin(rtc->bcd_year);
328 if (t->tm_year < 70)
329 t->tm_year += 100;
330 t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
331 } while (t->tm_sec != bcd2bin(rtc->bcd_sec));
332 }
333
334 rtc->msr = msr;
335
336 return 0;
337}
338
339/*
340 * Set the minutes and seconds from seconds value 'nowtime'. Fail if
341 * clock is out by > 30 minutes. Logic lifted from atari code.
342 * Algorithm is to wait for the 10ms register to change, and then to
343 * wait a short while, and then set it.
344 */
345
346int bvme6000_set_clock_mmss (unsigned long nowtime)
347{
348 int retval = 0;
349 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
350 unsigned char rtc_minutes, rtc_tenms;
351 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
352 unsigned char msr = rtc->msr & 0xc0;
353 unsigned long flags;
354 volatile int i;
355
356 rtc->msr = 0; /* Ensure clock accessible */
357 rtc_minutes = bcd2bin (rtc->bcd_min);
358
359 if ((rtc_minutes < real_minutes
360 ? real_minutes - rtc_minutes
361 : rtc_minutes - real_minutes) < 30)
362 {
363 local_irq_save(flags);
364 rtc_tenms = rtc->bcd_tenms;
365 while (rtc_tenms == rtc->bcd_tenms)
366 ;
367 for (i = 0; i < 1000; i++)
368 ;
369 rtc->bcd_min = bin2bcd(real_minutes);
370 rtc->bcd_sec = bin2bcd(real_seconds);
371 local_irq_restore(flags);
372 }
373 else
374 retval = -1;
375
376 rtc->msr = msr;
377
378 return retval;
379}
380