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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>
Adrian Bunk5b1d5f92008-10-13 21:58:47 +020028#include <linux/bcd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30#include <asm/bootinfo.h>
Geert Uytterhoeven4c3c5222013-10-02 11:37:33 +020031#include <asm/bootinfo-vme.h>
Geert Uytterhoevenabe48102013-10-04 11:41:24 +020032#include <asm/byteorder.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <asm/pgtable.h>
34#include <asm/setup.h>
35#include <asm/irq.h>
36#include <asm/traps.h>
37#include <asm/rtc.h>
38#include <asm/machdep.h>
39#include <asm/bvme6000hw.h>
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041static void bvme6000_get_model(char *model);
David Howells40220c12006-10-09 12:19:47 +010042extern void bvme6000_sched_init(irq_handler_t handler);
Stephen Warrenc8d5ba12012-11-08 11:34:55 -070043extern u32 bvme6000_gettimeoffset(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044extern int bvme6000_hwclk (int, struct rtc_time *);
45extern int bvme6000_set_clock_mmss (unsigned long);
46extern void bvme6000_reset (void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047void bvme6000_set_vectors (void);
48
Torben Hohne53f2762011-01-27 16:00:06 +010049/* Save tick handler routine pointer, will point to xtime_update() in
50 * kernel/timer/timekeeping.c, called via bvme6000_process_int() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
David Howells40220c12006-10-09 12:19:47 +010052static irq_handler_t tick_handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54
Geert Uytterhoevena4df02a2013-06-25 21:15:24 +020055int __init bvme6000_parse_bootinfo(const struct bi_record *bi)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Geert Uytterhoevenabe48102013-10-04 11:41:24 +020057 if (be16_to_cpu(bi->tag) == BI_VME_TYPE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 return 0;
59 else
60 return 1;
61}
62
63void bvme6000_reset(void)
64{
65 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
66
67 printk ("\r\n\nCalled bvme6000_reset\r\n"
68 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
69 /* The string of returns is to delay the reset until the whole
70 * message is output. */
71 /* Enable the watchdog, via PIT port C bit 4 */
72
73 pit->pcddr |= 0x10; /* WDOG enable */
74
75 while(1)
76 ;
77}
78
79static void bvme6000_get_model(char *model)
80{
81 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
82}
83
Roman Zippel200a3d32006-06-25 05:47:06 -070084/*
85 * This function is called during kernel startup to initialize
86 * the bvme6000 IRQ handling routines.
87 */
Al Viro66a3f822007-07-20 04:33:28 +010088static void __init bvme6000_init_IRQ(void)
Roman Zippel200a3d32006-06-25 05:47:06 -070089{
Geert Uytterhoevenf30a6482011-09-11 11:54:50 +020090 m68k_setup_user_interrupt(VEC_USER, 192);
Roman Zippel200a3d32006-06-25 05:47:06 -070091}
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93void __init config_bvme6000(void)
94{
95 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
96
97 /* Board type is only set by newer versions of vmelilo/tftplilo */
98 if (!vme_brdtype) {
99 if (m68k_cputype == CPU_68060)
100 vme_brdtype = VME_TYPE_BVME6000;
101 else
102 vme_brdtype = VME_TYPE_BVME4000;
103 }
104#if 0
105 /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
106 * debugger. Note trap_init() will splat the abort vector, but
107 * bvme6000_init_IRQ() will put it back again. Hopefully. */
108
109 bvme6000_set_vectors();
110#endif
111
112 mach_max_dma_address = 0xffffffff;
113 mach_sched_init = bvme6000_sched_init;
114 mach_init_IRQ = bvme6000_init_IRQ;
Stephen Warrenc8d5ba12012-11-08 11:34:55 -0700115 arch_gettimeoffset = bvme6000_gettimeoffset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 mach_hwclk = bvme6000_hwclk;
117 mach_set_clock_mmss = bvme6000_set_clock_mmss;
118 mach_reset = bvme6000_reset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 mach_get_model = bvme6000_get_model;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121 printk ("Board is %sconfigured as a System Controller\n",
122 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
123
124 /* Now do the PIT configuration */
125
126 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */
Akinobu Mita0b280022006-03-26 01:38:58 -0800127 pit->psrr = 0x18; /* PIACK and PIRQ functions enabled */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */
129 pit->padr = 0x00; /* Just to be tidy! */
130 pit->paddr = 0x00; /* All inputs for now (safest) */
131 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */
132 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
133 /* PRI, SYSCON?, Level3, SCC clks from xtal */
134 pit->pbddr = 0xf3; /* Mostly outputs */
135 pit->pcdr = 0x01; /* PA transceiver disabled */
136 pit->pcddr = 0x03; /* WDOG disable */
137
138 /* Disable snooping for Ethernet and VME accesses */
139
140 bvme_acr_addrctl = 0;
141}
142
143
Al Viro2850bc22006-10-07 14:16:45 +0100144irqreturn_t bvme6000_abort_int (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
146 unsigned long *new = (unsigned long *)vectors;
147 unsigned long *old = (unsigned long *)0xf8000000;
148
149 /* Wait for button release */
150 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS)
151 ;
152
153 *(new+4) = *(old+4); /* Illegal instruction */
154 *(new+9) = *(old+9); /* Trace */
155 *(new+47) = *(old+47); /* Trap #15 */
156 *(new+0x1f) = *(old+0x1f); /* ABORT switch */
157 return IRQ_HANDLED;
158}
159
160
Al Viro2850bc22006-10-07 14:16:45 +0100161static irqreturn_t bvme6000_timer_int (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
163 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
164 unsigned char msr = rtc->msr & 0xc0;
165
166 rtc->msr = msr | 0x20; /* Ack the interrupt */
167
Al Viro2850bc22006-10-07 14:16:45 +0100168 return tick_handler(irq, dev_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
170
171/*
172 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
173 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low.
174 * So, when reading the elapsed time, you should read timer1,
175 * subtract it from 39999, and then add 40000 if T1 is high.
176 * That gives you the number of 125ns ticks in to the 10ms period,
177 * so divide by 8 to get the microsecond result.
178 */
179
David Howells40220c12006-10-09 12:19:47 +0100180void bvme6000_sched_init (irq_handler_t timer_routine)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
182 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
183 unsigned char msr = rtc->msr & 0xc0;
184
185 rtc->msr = 0; /* Ensure timer registers accessible */
186
187 tick_handler = timer_routine;
188 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
189 "timer", bvme6000_timer_int))
190 panic ("Couldn't register timer int");
191
192 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */
193 rtc->t1msb = 39999 >> 8;
194 rtc->t1lsb = 39999 & 0xff;
195 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */
196 rtc->msr = 0x40; /* Access int.cntrl, etc */
197 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */
198 rtc->irr_icr1 = 0;
199 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */
200 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */
201 rtc->msr = 0; /* Access timer 1 control */
202 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */
203
204 rtc->msr = msr;
205
206 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
207 "abort", bvme6000_abort_int))
208 panic ("Couldn't register abort int");
209}
210
211
212/* This is always executed with interrupts disabled. */
213
214/*
215 * NOTE: Don't accept any readings within 5us of rollover, as
216 * the T1INT bit may be a little slow getting set. There is also
217 * a fault in the chip, meaning that reads may produce invalid
218 * results...
219 */
220
Stephen Warrenc8d5ba12012-11-08 11:34:55 -0700221u32 bvme6000_gettimeoffset(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
223 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
224 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
225 unsigned char msr = rtc->msr & 0xc0;
226 unsigned char t1int, t1op;
Stephen Warrenc8d5ba12012-11-08 11:34:55 -0700227 u32 v = 800000, ov;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
229 rtc->msr = 0; /* Ensure timer registers accessible */
230
231 do {
232 ov = v;
233 t1int = rtc->msr & 0x20;
234 t1op = pit->pcdr & 0x04;
235 rtc->t1cr_omr |= 0x40; /* Latch timer1 */
236 v = rtc->t1msb << 8; /* Read timer1 */
237 v |= rtc->t1lsb; /* Read timer1 */
238 } while (t1int != (rtc->msr & 0x20) ||
239 t1op != (pit->pcdr & 0x04) ||
240 abs(ov-v) > 80 ||
241 v > 39960);
242
243 v = 39999 - v;
244 if (!t1op) /* If in second half cycle.. */
245 v += 40000;
246 v /= 8; /* Convert ticks to microseconds */
247 if (t1int)
248 v += 10000; /* Int pending, + 10ms */
249 rtc->msr = msr;
250
Stephen Warrenc8d5ba12012-11-08 11:34:55 -0700251 return v * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252}
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254/*
255 * Looks like op is non-zero for setting the clock, and zero for
256 * reading the clock.
257 *
258 * struct hwclk_time {
259 * unsigned sec; 0..59
260 * unsigned min; 0..59
261 * unsigned hour; 0..23
262 * unsigned day; 1..31
263 * unsigned mon; 0..11
264 * unsigned year; 00...
265 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set
266 * };
267 */
268
269int bvme6000_hwclk(int op, struct rtc_time *t)
270{
271 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
272 unsigned char msr = rtc->msr & 0xc0;
273
274 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register
275 * are accessible */
276 if (op)
277 { /* Write.... */
278 rtc->t0cr_rtmr = t->tm_year%4;
279 rtc->bcd_tenms = 0;
280 rtc->bcd_sec = bin2bcd(t->tm_sec);
281 rtc->bcd_min = bin2bcd(t->tm_min);
282 rtc->bcd_hr = bin2bcd(t->tm_hour);
283 rtc->bcd_dom = bin2bcd(t->tm_mday);
284 rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
285 rtc->bcd_year = bin2bcd(t->tm_year%100);
286 if (t->tm_wday >= 0)
287 rtc->bcd_dow = bin2bcd(t->tm_wday+1);
288 rtc->t0cr_rtmr = t->tm_year%4 | 0x08;
289 }
290 else
291 { /* Read.... */
292 do {
293 t->tm_sec = bcd2bin(rtc->bcd_sec);
294 t->tm_min = bcd2bin(rtc->bcd_min);
295 t->tm_hour = bcd2bin(rtc->bcd_hr);
296 t->tm_mday = bcd2bin(rtc->bcd_dom);
297 t->tm_mon = bcd2bin(rtc->bcd_mth)-1;
298 t->tm_year = bcd2bin(rtc->bcd_year);
299 if (t->tm_year < 70)
300 t->tm_year += 100;
301 t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
302 } while (t->tm_sec != bcd2bin(rtc->bcd_sec));
303 }
304
305 rtc->msr = msr;
306
307 return 0;
308}
309
310/*
311 * Set the minutes and seconds from seconds value 'nowtime'. Fail if
312 * clock is out by > 30 minutes. Logic lifted from atari code.
313 * Algorithm is to wait for the 10ms register to change, and then to
314 * wait a short while, and then set it.
315 */
316
317int bvme6000_set_clock_mmss (unsigned long nowtime)
318{
319 int retval = 0;
320 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
321 unsigned char rtc_minutes, rtc_tenms;
322 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
323 unsigned char msr = rtc->msr & 0xc0;
324 unsigned long flags;
325 volatile int i;
326
327 rtc->msr = 0; /* Ensure clock accessible */
328 rtc_minutes = bcd2bin (rtc->bcd_min);
329
330 if ((rtc_minutes < real_minutes
331 ? real_minutes - rtc_minutes
332 : rtc_minutes - real_minutes) < 30)
333 {
334 local_irq_save(flags);
335 rtc_tenms = rtc->bcd_tenms;
336 while (rtc_tenms == rtc->bcd_tenms)
337 ;
338 for (i = 0; i < 1000; i++)
339 ;
340 rtc->bcd_min = bin2bcd(real_minutes);
341 rtc->bcd_sec = bin2bcd(real_seconds);
342 local_irq_restore(flags);
343 }
344 else
345 retval = -1;
346
347 rtc->msr = msr;
348
349 return retval;
350}
351