ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / arch / m68k / bvme6000 / config.c
blob1edd95095cb4f6c9b1bc59a6fd219693f19454e6
1 /*
2 * arch/m68k/bvme6000/config.c
4 * Copyright (C) 1997 Richard Hirst [richard@sleepie.demon.co.uk]
6 * Based on:
8 * linux/amiga/config.c
10 * Copyright (C) 1993 Hamish Macdonald
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.
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>
30 #include <asm/bootinfo.h>
31 #include <asm/system.h>
32 #include <asm/pgtable.h>
33 #include <asm/setup.h>
34 #include <asm/irq.h>
35 #include <asm/traps.h>
36 #include <asm/rtc.h>
37 #include <asm/machdep.h>
38 #include <asm/bvme6000hw.h>
40 static void bvme6000_get_model(char *model);
41 extern void bvme6000_sched_init(irq_handler_t handler);
42 extern unsigned long bvme6000_gettimeoffset (void);
43 extern int bvme6000_hwclk (int, struct rtc_time *);
44 extern int bvme6000_set_clock_mmss (unsigned long);
45 extern void bvme6000_reset (void);
46 void bvme6000_set_vectors (void);
48 /* Save tick handler routine pointer, will point to xtime_update() in
49 * kernel/timer/timekeeping.c, called via bvme6000_process_int() */
51 static irq_handler_t tick_handler;
54 int bvme6000_parse_bootinfo(const struct bi_record *bi)
56 if (bi->tag == BI_VME_TYPE)
57 return 0;
58 else
59 return 1;
62 void bvme6000_reset(void)
64 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
66 printk ("\r\n\nCalled bvme6000_reset\r\n"
67 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
68 /* The string of returns is to delay the reset until the whole
69 * message is output. */
70 /* Enable the watchdog, via PIT port C bit 4 */
72 pit->pcddr |= 0x10; /* WDOG enable */
74 while(1)
78 static void bvme6000_get_model(char *model)
80 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
84 * This function is called during kernel startup to initialize
85 * the bvme6000 IRQ handling routines.
87 static void __init bvme6000_init_IRQ(void)
89 m68k_setup_user_interrupt(VEC_USER, 192, NULL);
92 void __init config_bvme6000(void)
94 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
96 /* Board type is only set by newer versions of vmelilo/tftplilo */
97 if (!vme_brdtype) {
98 if (m68k_cputype == CPU_68060)
99 vme_brdtype = VME_TYPE_BVME6000;
100 else
101 vme_brdtype = VME_TYPE_BVME4000;
103 #if 0
104 /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
105 * debugger. Note trap_init() will splat the abort vector, but
106 * bvme6000_init_IRQ() will put it back again. Hopefully. */
108 bvme6000_set_vectors();
109 #endif
111 mach_max_dma_address = 0xffffffff;
112 mach_sched_init = bvme6000_sched_init;
113 mach_init_IRQ = bvme6000_init_IRQ;
114 mach_gettimeoffset = bvme6000_gettimeoffset;
115 mach_hwclk = bvme6000_hwclk;
116 mach_set_clock_mmss = bvme6000_set_clock_mmss;
117 mach_reset = bvme6000_reset;
118 mach_get_model = bvme6000_get_model;
120 printk ("Board is %sconfigured as a System Controller\n",
121 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
123 /* Now do the PIT configuration */
125 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */
126 pit->psrr = 0x18; /* PIACK and PIRQ functions enabled */
127 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */
128 pit->padr = 0x00; /* Just to be tidy! */
129 pit->paddr = 0x00; /* All inputs for now (safest) */
130 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */
131 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
132 /* PRI, SYSCON?, Level3, SCC clks from xtal */
133 pit->pbddr = 0xf3; /* Mostly outputs */
134 pit->pcdr = 0x01; /* PA transceiver disabled */
135 pit->pcddr = 0x03; /* WDOG disable */
137 /* Disable snooping for Ethernet and VME accesses */
139 bvme_acr_addrctl = 0;
143 irqreturn_t bvme6000_abort_int (int irq, void *dev_id)
145 unsigned long *new = (unsigned long *)vectors;
146 unsigned long *old = (unsigned long *)0xf8000000;
148 /* Wait for button release */
149 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS)
152 *(new+4) = *(old+4); /* Illegal instruction */
153 *(new+9) = *(old+9); /* Trace */
154 *(new+47) = *(old+47); /* Trap #15 */
155 *(new+0x1f) = *(old+0x1f); /* ABORT switch */
156 return IRQ_HANDLED;
160 static irqreturn_t bvme6000_timer_int (int irq, void *dev_id)
162 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
163 unsigned char msr = rtc->msr & 0xc0;
165 rtc->msr = msr | 0x20; /* Ack the interrupt */
167 return tick_handler(irq, dev_id);
171 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
172 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low.
173 * So, when reading the elapsed time, you should read timer1,
174 * subtract it from 39999, and then add 40000 if T1 is high.
175 * That gives you the number of 125ns ticks in to the 10ms period,
176 * so divide by 8 to get the microsecond result.
179 void bvme6000_sched_init (irq_handler_t timer_routine)
181 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
182 unsigned char msr = rtc->msr & 0xc0;
184 rtc->msr = 0; /* Ensure timer registers accessible */
186 tick_handler = timer_routine;
187 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
188 "timer", bvme6000_timer_int))
189 panic ("Couldn't register timer int");
191 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */
192 rtc->t1msb = 39999 >> 8;
193 rtc->t1lsb = 39999 & 0xff;
194 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */
195 rtc->msr = 0x40; /* Access int.cntrl, etc */
196 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */
197 rtc->irr_icr1 = 0;
198 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */
199 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */
200 rtc->msr = 0; /* Access timer 1 control */
201 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */
203 rtc->msr = msr;
205 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
206 "abort", bvme6000_abort_int))
207 panic ("Couldn't register abort int");
211 /* This is always executed with interrupts disabled. */
214 * NOTE: Don't accept any readings within 5us of rollover, as
215 * the T1INT bit may be a little slow getting set. There is also
216 * a fault in the chip, meaning that reads may produce invalid
217 * results...
220 unsigned long bvme6000_gettimeoffset (void)
222 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
223 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
224 unsigned char msr = rtc->msr & 0xc0;
225 unsigned char t1int, t1op;
226 unsigned long v = 800000, ov;
228 rtc->msr = 0; /* Ensure timer registers accessible */
230 do {
231 ov = v;
232 t1int = rtc->msr & 0x20;
233 t1op = pit->pcdr & 0x04;
234 rtc->t1cr_omr |= 0x40; /* Latch timer1 */
235 v = rtc->t1msb << 8; /* Read timer1 */
236 v |= rtc->t1lsb; /* Read timer1 */
237 } while (t1int != (rtc->msr & 0x20) ||
238 t1op != (pit->pcdr & 0x04) ||
239 abs(ov-v) > 80 ||
240 v > 39960);
242 v = 39999 - v;
243 if (!t1op) /* If in second half cycle.. */
244 v += 40000;
245 v /= 8; /* Convert ticks to microseconds */
246 if (t1int)
247 v += 10000; /* Int pending, + 10ms */
248 rtc->msr = msr;
250 return v;
254 * Looks like op is non-zero for setting the clock, and zero for
255 * reading the clock.
257 * struct hwclk_time {
258 * unsigned sec; 0..59
259 * unsigned min; 0..59
260 * unsigned hour; 0..23
261 * unsigned day; 1..31
262 * unsigned mon; 0..11
263 * unsigned year; 00...
264 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set
265 * };
268 int bvme6000_hwclk(int op, struct rtc_time *t)
270 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
271 unsigned char msr = rtc->msr & 0xc0;
273 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register
274 * are accessible */
275 if (op)
276 { /* Write.... */
277 rtc->t0cr_rtmr = t->tm_year%4;
278 rtc->bcd_tenms = 0;
279 rtc->bcd_sec = bin2bcd(t->tm_sec);
280 rtc->bcd_min = bin2bcd(t->tm_min);
281 rtc->bcd_hr = bin2bcd(t->tm_hour);
282 rtc->bcd_dom = bin2bcd(t->tm_mday);
283 rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
284 rtc->bcd_year = bin2bcd(t->tm_year%100);
285 if (t->tm_wday >= 0)
286 rtc->bcd_dow = bin2bcd(t->tm_wday+1);
287 rtc->t0cr_rtmr = t->tm_year%4 | 0x08;
289 else
290 { /* Read.... */
291 do {
292 t->tm_sec = bcd2bin(rtc->bcd_sec);
293 t->tm_min = bcd2bin(rtc->bcd_min);
294 t->tm_hour = bcd2bin(rtc->bcd_hr);
295 t->tm_mday = bcd2bin(rtc->bcd_dom);
296 t->tm_mon = bcd2bin(rtc->bcd_mth)-1;
297 t->tm_year = bcd2bin(rtc->bcd_year);
298 if (t->tm_year < 70)
299 t->tm_year += 100;
300 t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
301 } while (t->tm_sec != bcd2bin(rtc->bcd_sec));
304 rtc->msr = msr;
306 return 0;
310 * Set the minutes and seconds from seconds value 'nowtime'. Fail if
311 * clock is out by > 30 minutes. Logic lifted from atari code.
312 * Algorithm is to wait for the 10ms register to change, and then to
313 * wait a short while, and then set it.
316 int bvme6000_set_clock_mmss (unsigned long nowtime)
318 int retval = 0;
319 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
320 unsigned char rtc_minutes, rtc_tenms;
321 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
322 unsigned char msr = rtc->msr & 0xc0;
323 unsigned long flags;
324 volatile int i;
326 rtc->msr = 0; /* Ensure clock accessible */
327 rtc_minutes = bcd2bin (rtc->bcd_min);
329 if ((rtc_minutes < real_minutes
330 ? real_minutes - rtc_minutes
331 : rtc_minutes - real_minutes) < 30)
333 local_irq_save(flags);
334 rtc_tenms = rtc->bcd_tenms;
335 while (rtc_tenms == rtc->bcd_tenms)
337 for (i = 0; i < 1000; i++)
339 rtc->bcd_min = bin2bcd(real_minutes);
340 rtc->bcd_sec = bin2bcd(real_seconds);
341 local_irq_restore(flags);
343 else
344 retval = -1;
346 rtc->msr = msr;
348 return retval;