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 #include <linux/genhd.h>
26 #include <linux/rtc.h>
27 #include <linux/interrupt.h>
28 #include <linux/bcd.h>
29
30 #include <asm/bootinfo.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
39 static void bvme6000_get_model(char *model);
40 extern void bvme6000_sched_init(irq_handler_t handler);
41 extern u32 bvme6000_gettimeoffset(void);
42 extern int bvme6000_hwclk (int, struct rtc_time *);
43 extern int bvme6000_set_clock_mmss (unsigned long);
44 extern void bvme6000_reset (void);
45 void bvme6000_set_vectors (void);
46
47 /* Save tick handler routine pointer, will point to xtime_update() in
48 * kernel/timer/timekeeping.c, called via bvme6000_process_int() */
49
50 static irq_handler_t tick_handler;
51
52
bvme6000_parse_bootinfo(const struct bi_record * bi)53 int bvme6000_parse_bootinfo(const struct bi_record *bi)
54 {
55 if (bi->tag == BI_VME_TYPE)
56 return 0;
57 else
58 return 1;
59 }
60
bvme6000_reset(void)61 void bvme6000_reset(void)
62 {
63 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
64
65 printk ("\r\n\nCalled bvme6000_reset\r\n"
66 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
67 /* The string of returns is to delay the reset until the whole
68 * message is output. */
69 /* Enable the watchdog, via PIT port C bit 4 */
70
71 pit->pcddr |= 0x10; /* WDOG enable */
72
73 while(1)
74 ;
75 }
76
bvme6000_get_model(char * model)77 static void bvme6000_get_model(char *model)
78 {
79 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
80 }
81
82 /*
83 * This function is called during kernel startup to initialize
84 * the bvme6000 IRQ handling routines.
85 */
bvme6000_init_IRQ(void)86 static void __init bvme6000_init_IRQ(void)
87 {
88 m68k_setup_user_interrupt(VEC_USER, 192);
89 }
90
config_bvme6000(void)91 void __init config_bvme6000(void)
92 {
93 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
94
95 /* Board type is only set by newer versions of vmelilo/tftplilo */
96 if (!vme_brdtype) {
97 if (m68k_cputype == CPU_68060)
98 vme_brdtype = VME_TYPE_BVME6000;
99 else
100 vme_brdtype = VME_TYPE_BVME4000;
101 }
102 #if 0
103 /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
104 * debugger. Note trap_init() will splat the abort vector, but
105 * bvme6000_init_IRQ() will put it back again. Hopefully. */
106
107 bvme6000_set_vectors();
108 #endif
109
110 mach_max_dma_address = 0xffffffff;
111 mach_sched_init = bvme6000_sched_init;
112 mach_init_IRQ = bvme6000_init_IRQ;
113 arch_gettimeoffset = bvme6000_gettimeoffset;
114 mach_hwclk = bvme6000_hwclk;
115 mach_set_clock_mmss = bvme6000_set_clock_mmss;
116 mach_reset = bvme6000_reset;
117 mach_get_model = bvme6000_get_model;
118
119 printk ("Board is %sconfigured as a System Controller\n",
120 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
121
122 /* Now do the PIT configuration */
123
124 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */
125 pit->psrr = 0x18; /* PIACK and PIRQ functions enabled */
126 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */
127 pit->padr = 0x00; /* Just to be tidy! */
128 pit->paddr = 0x00; /* All inputs for now (safest) */
129 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */
130 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
131 /* PRI, SYSCON?, Level3, SCC clks from xtal */
132 pit->pbddr = 0xf3; /* Mostly outputs */
133 pit->pcdr = 0x01; /* PA transceiver disabled */
134 pit->pcddr = 0x03; /* WDOG disable */
135
136 /* Disable snooping for Ethernet and VME accesses */
137
138 bvme_acr_addrctl = 0;
139 }
140
141
bvme6000_abort_int(int irq,void * dev_id)142 irqreturn_t bvme6000_abort_int (int irq, void *dev_id)
143 {
144 unsigned long *new = (unsigned long *)vectors;
145 unsigned long *old = (unsigned long *)0xf8000000;
146
147 /* Wait for button release */
148 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS)
149 ;
150
151 *(new+4) = *(old+4); /* Illegal instruction */
152 *(new+9) = *(old+9); /* Trace */
153 *(new+47) = *(old+47); /* Trap #15 */
154 *(new+0x1f) = *(old+0x1f); /* ABORT switch */
155 return IRQ_HANDLED;
156 }
157
158
bvme6000_timer_int(int irq,void * dev_id)159 static irqreturn_t bvme6000_timer_int (int irq, void *dev_id)
160 {
161 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
162 unsigned char msr = rtc->msr & 0xc0;
163
164 rtc->msr = msr | 0x20; /* Ack the interrupt */
165
166 return tick_handler(irq, dev_id);
167 }
168
169 /*
170 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
171 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low.
172 * So, when reading the elapsed time, you should read timer1,
173 * subtract it from 39999, and then add 40000 if T1 is high.
174 * That gives you the number of 125ns ticks in to the 10ms period,
175 * so divide by 8 to get the microsecond result.
176 */
177
bvme6000_sched_init(irq_handler_t timer_routine)178 void bvme6000_sched_init (irq_handler_t timer_routine)
179 {
180 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
181 unsigned char msr = rtc->msr & 0xc0;
182
183 rtc->msr = 0; /* Ensure timer registers accessible */
184
185 tick_handler = timer_routine;
186 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
187 "timer", bvme6000_timer_int))
188 panic ("Couldn't register timer int");
189
190 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */
191 rtc->t1msb = 39999 >> 8;
192 rtc->t1lsb = 39999 & 0xff;
193 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */
194 rtc->msr = 0x40; /* Access int.cntrl, etc */
195 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */
196 rtc->irr_icr1 = 0;
197 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */
198 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */
199 rtc->msr = 0; /* Access timer 1 control */
200 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */
201
202 rtc->msr = msr;
203
204 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
205 "abort", bvme6000_abort_int))
206 panic ("Couldn't register abort int");
207 }
208
209
210 /* This is always executed with interrupts disabled. */
211
212 /*
213 * NOTE: Don't accept any readings within 5us of rollover, as
214 * the T1INT bit may be a little slow getting set. There is also
215 * a fault in the chip, meaning that reads may produce invalid
216 * results...
217 */
218
bvme6000_gettimeoffset(void)219 u32 bvme6000_gettimeoffset(void)
220 {
221 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
222 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
223 unsigned char msr = rtc->msr & 0xc0;
224 unsigned char t1int, t1op;
225 u32 v = 800000, ov;
226
227 rtc->msr = 0; /* Ensure timer registers accessible */
228
229 do {
230 ov = v;
231 t1int = rtc->msr & 0x20;
232 t1op = pit->pcdr & 0x04;
233 rtc->t1cr_omr |= 0x40; /* Latch timer1 */
234 v = rtc->t1msb << 8; /* Read timer1 */
235 v |= rtc->t1lsb; /* Read timer1 */
236 } while (t1int != (rtc->msr & 0x20) ||
237 t1op != (pit->pcdr & 0x04) ||
238 abs(ov-v) > 80 ||
239 v > 39960);
240
241 v = 39999 - v;
242 if (!t1op) /* If in second half cycle.. */
243 v += 40000;
244 v /= 8; /* Convert ticks to microseconds */
245 if (t1int)
246 v += 10000; /* Int pending, + 10ms */
247 rtc->msr = msr;
248
249 return v * 1000;
250 }
251
252 /*
253 * Looks like op is non-zero for setting the clock, and zero for
254 * reading the clock.
255 *
256 * struct hwclk_time {
257 * unsigned sec; 0..59
258 * unsigned min; 0..59
259 * unsigned hour; 0..23
260 * unsigned day; 1..31
261 * unsigned mon; 0..11
262 * unsigned year; 00...
263 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set
264 * };
265 */
266
bvme6000_hwclk(int op,struct rtc_time * t)267 int bvme6000_hwclk(int op, struct rtc_time *t)
268 {
269 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
270 unsigned char msr = rtc->msr & 0xc0;
271
272 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register
273 * are accessible */
274 if (op)
275 { /* Write.... */
276 rtc->t0cr_rtmr = t->tm_year%4;
277 rtc->bcd_tenms = 0;
278 rtc->bcd_sec = bin2bcd(t->tm_sec);
279 rtc->bcd_min = bin2bcd(t->tm_min);
280 rtc->bcd_hr = bin2bcd(t->tm_hour);
281 rtc->bcd_dom = bin2bcd(t->tm_mday);
282 rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
283 rtc->bcd_year = bin2bcd(t->tm_year%100);
284 if (t->tm_wday >= 0)
285 rtc->bcd_dow = bin2bcd(t->tm_wday+1);
286 rtc->t0cr_rtmr = t->tm_year%4 | 0x08;
287 }
288 else
289 { /* Read.... */
290 do {
291 t->tm_sec = bcd2bin(rtc->bcd_sec);
292 t->tm_min = bcd2bin(rtc->bcd_min);
293 t->tm_hour = bcd2bin(rtc->bcd_hr);
294 t->tm_mday = bcd2bin(rtc->bcd_dom);
295 t->tm_mon = bcd2bin(rtc->bcd_mth)-1;
296 t->tm_year = bcd2bin(rtc->bcd_year);
297 if (t->tm_year < 70)
298 t->tm_year += 100;
299 t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
300 } while (t->tm_sec != bcd2bin(rtc->bcd_sec));
301 }
302
303 rtc->msr = msr;
304
305 return 0;
306 }
307
308 /*
309 * Set the minutes and seconds from seconds value 'nowtime'. Fail if
310 * clock is out by > 30 minutes. Logic lifted from atari code.
311 * Algorithm is to wait for the 10ms register to change, and then to
312 * wait a short while, and then set it.
313 */
314
bvme6000_set_clock_mmss(unsigned long nowtime)315 int bvme6000_set_clock_mmss (unsigned long nowtime)
316 {
317 int retval = 0;
318 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
319 unsigned char rtc_minutes, rtc_tenms;
320 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
321 unsigned char msr = rtc->msr & 0xc0;
322 unsigned long flags;
323 volatile int i;
324
325 rtc->msr = 0; /* Ensure clock accessible */
326 rtc_minutes = bcd2bin (rtc->bcd_min);
327
328 if ((rtc_minutes < real_minutes
329 ? real_minutes - rtc_minutes
330 : rtc_minutes - real_minutes) < 30)
331 {
332 local_irq_save(flags);
333 rtc_tenms = rtc->bcd_tenms;
334 while (rtc_tenms == rtc->bcd_tenms)
335 ;
336 for (i = 0; i < 1000; i++)
337 ;
338 rtc->bcd_min = bin2bcd(real_minutes);
339 rtc->bcd_sec = bin2bcd(real_seconds);
340 local_irq_restore(flags);
341 }
342 else
343 retval = -1;
344
345 rtc->msr = msr;
346
347 return retval;
348 }
349
350