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1da177e4 LT |
1 | /* $Id: time.c,v 1.42 2002/01/23 14:33:55 davem Exp $ |
2 | * time.c: UltraSparc timer and TOD clock support. | |
3 | * | |
4 | * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) | |
6 | * | |
7 | * Based largely on code which is: | |
8 | * | |
9 | * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu) | |
10 | */ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/param.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/time.h> | |
22 | #include <linux/timex.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/ioport.h> | |
25 | #include <linux/mc146818rtc.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/profile.h> | |
28 | #include <linux/bcd.h> | |
29 | #include <linux/jiffies.h> | |
30 | #include <linux/cpufreq.h> | |
31 | #include <linux/percpu.h> | |
32 | #include <linux/profile.h> | |
33 | ||
34 | #include <asm/oplib.h> | |
35 | #include <asm/mostek.h> | |
36 | #include <asm/timer.h> | |
37 | #include <asm/irq.h> | |
38 | #include <asm/io.h> | |
39 | #include <asm/sbus.h> | |
40 | #include <asm/fhc.h> | |
41 | #include <asm/pbm.h> | |
42 | #include <asm/ebus.h> | |
43 | #include <asm/isa.h> | |
44 | #include <asm/starfire.h> | |
45 | #include <asm/smp.h> | |
46 | #include <asm/sections.h> | |
47 | #include <asm/cpudata.h> | |
48 | ||
49 | DEFINE_SPINLOCK(mostek_lock); | |
50 | DEFINE_SPINLOCK(rtc_lock); | |
ef0299bf | 51 | void __iomem *mstk48t02_regs = NULL; |
1da177e4 LT |
52 | #ifdef CONFIG_PCI |
53 | unsigned long ds1287_regs = 0UL; | |
54 | #endif | |
55 | ||
56 | extern unsigned long wall_jiffies; | |
57 | ||
58 | u64 jiffies_64 = INITIAL_JIFFIES; | |
59 | ||
60 | EXPORT_SYMBOL(jiffies_64); | |
61 | ||
ef0299bf AV |
62 | static void __iomem *mstk48t08_regs; |
63 | static void __iomem *mstk48t59_regs; | |
1da177e4 LT |
64 | |
65 | static int set_rtc_mmss(unsigned long); | |
66 | ||
67 | static __init unsigned long dummy_get_tick(void) | |
68 | { | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static __initdata struct sparc64_tick_ops dummy_tick_ops = { | |
73 | .get_tick = dummy_get_tick, | |
74 | }; | |
75 | ||
d369ddd2 | 76 | struct sparc64_tick_ops *tick_ops __read_mostly = &dummy_tick_ops; |
1da177e4 LT |
77 | |
78 | #define TICK_PRIV_BIT (1UL << 63) | |
79 | ||
80 | #ifdef CONFIG_SMP | |
81 | unsigned long profile_pc(struct pt_regs *regs) | |
82 | { | |
83 | unsigned long pc = instruction_pointer(regs); | |
84 | ||
85 | if (in_lock_functions(pc)) | |
86 | return regs->u_regs[UREG_RETPC]; | |
87 | return pc; | |
88 | } | |
89 | EXPORT_SYMBOL(profile_pc); | |
90 | #endif | |
91 | ||
92 | static void tick_disable_protection(void) | |
93 | { | |
94 | /* Set things up so user can access tick register for profiling | |
95 | * purposes. Also workaround BB_ERRATA_1 by doing a dummy | |
96 | * read back of %tick after writing it. | |
97 | */ | |
98 | __asm__ __volatile__( | |
99 | " ba,pt %%xcc, 1f\n" | |
100 | " nop\n" | |
101 | " .align 64\n" | |
102 | "1: rd %%tick, %%g2\n" | |
103 | " add %%g2, 6, %%g2\n" | |
104 | " andn %%g2, %0, %%g2\n" | |
105 | " wrpr %%g2, 0, %%tick\n" | |
106 | " rdpr %%tick, %%g0" | |
107 | : /* no outputs */ | |
108 | : "r" (TICK_PRIV_BIT) | |
109 | : "g2"); | |
110 | } | |
111 | ||
112 | static void tick_init_tick(unsigned long offset) | |
113 | { | |
114 | tick_disable_protection(); | |
115 | ||
116 | __asm__ __volatile__( | |
117 | " rd %%tick, %%g1\n" | |
118 | " andn %%g1, %1, %%g1\n" | |
119 | " ba,pt %%xcc, 1f\n" | |
120 | " add %%g1, %0, %%g1\n" | |
121 | " .align 64\n" | |
122 | "1: wr %%g1, 0x0, %%tick_cmpr\n" | |
123 | " rd %%tick_cmpr, %%g0" | |
124 | : /* no outputs */ | |
125 | : "r" (offset), "r" (TICK_PRIV_BIT) | |
126 | : "g1"); | |
127 | } | |
128 | ||
129 | static unsigned long tick_get_tick(void) | |
130 | { | |
131 | unsigned long ret; | |
132 | ||
133 | __asm__ __volatile__("rd %%tick, %0\n\t" | |
134 | "mov %0, %0" | |
135 | : "=r" (ret)); | |
136 | ||
137 | return ret & ~TICK_PRIV_BIT; | |
138 | } | |
139 | ||
140 | static unsigned long tick_get_compare(void) | |
141 | { | |
142 | unsigned long ret; | |
143 | ||
144 | __asm__ __volatile__("rd %%tick_cmpr, %0\n\t" | |
145 | "mov %0, %0" | |
146 | : "=r" (ret)); | |
147 | ||
148 | return ret; | |
149 | } | |
150 | ||
151 | static unsigned long tick_add_compare(unsigned long adj) | |
152 | { | |
153 | unsigned long new_compare; | |
154 | ||
155 | /* Workaround for Spitfire Errata (#54 I think??), I discovered | |
156 | * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch | |
157 | * number 103640. | |
158 | * | |
159 | * On Blackbird writes to %tick_cmpr can fail, the | |
160 | * workaround seems to be to execute the wr instruction | |
161 | * at the start of an I-cache line, and perform a dummy | |
162 | * read back from %tick_cmpr right after writing to it. -DaveM | |
163 | */ | |
164 | __asm__ __volatile__("rd %%tick_cmpr, %0\n\t" | |
165 | "ba,pt %%xcc, 1f\n\t" | |
166 | " add %0, %1, %0\n\t" | |
167 | ".align 64\n" | |
168 | "1:\n\t" | |
169 | "wr %0, 0, %%tick_cmpr\n\t" | |
170 | "rd %%tick_cmpr, %%g0" | |
171 | : "=&r" (new_compare) | |
172 | : "r" (adj)); | |
173 | ||
174 | return new_compare; | |
175 | } | |
176 | ||
177 | static unsigned long tick_add_tick(unsigned long adj, unsigned long offset) | |
178 | { | |
179 | unsigned long new_tick, tmp; | |
180 | ||
181 | /* Also need to handle Blackbird bug here too. */ | |
182 | __asm__ __volatile__("rd %%tick, %0\n\t" | |
183 | "add %0, %2, %0\n\t" | |
184 | "wrpr %0, 0, %%tick\n\t" | |
185 | "andn %0, %4, %1\n\t" | |
186 | "ba,pt %%xcc, 1f\n\t" | |
187 | " add %1, %3, %1\n\t" | |
188 | ".align 64\n" | |
189 | "1:\n\t" | |
190 | "wr %1, 0, %%tick_cmpr\n\t" | |
191 | "rd %%tick_cmpr, %%g0" | |
192 | : "=&r" (new_tick), "=&r" (tmp) | |
193 | : "r" (adj), "r" (offset), "r" (TICK_PRIV_BIT)); | |
194 | ||
195 | return new_tick; | |
196 | } | |
197 | ||
d369ddd2 | 198 | static struct sparc64_tick_ops tick_operations __read_mostly = { |
1da177e4 LT |
199 | .init_tick = tick_init_tick, |
200 | .get_tick = tick_get_tick, | |
201 | .get_compare = tick_get_compare, | |
202 | .add_tick = tick_add_tick, | |
203 | .add_compare = tick_add_compare, | |
204 | .softint_mask = 1UL << 0, | |
205 | }; | |
206 | ||
207 | static void stick_init_tick(unsigned long offset) | |
208 | { | |
209 | tick_disable_protection(); | |
210 | ||
211 | /* Let the user get at STICK too. */ | |
212 | __asm__ __volatile__( | |
213 | " rd %%asr24, %%g2\n" | |
214 | " andn %%g2, %0, %%g2\n" | |
215 | " wr %%g2, 0, %%asr24" | |
216 | : /* no outputs */ | |
217 | : "r" (TICK_PRIV_BIT) | |
218 | : "g1", "g2"); | |
219 | ||
220 | __asm__ __volatile__( | |
221 | " rd %%asr24, %%g1\n" | |
222 | " andn %%g1, %1, %%g1\n" | |
223 | " add %%g1, %0, %%g1\n" | |
224 | " wr %%g1, 0x0, %%asr25" | |
225 | : /* no outputs */ | |
226 | : "r" (offset), "r" (TICK_PRIV_BIT) | |
227 | : "g1"); | |
228 | } | |
229 | ||
230 | static unsigned long stick_get_tick(void) | |
231 | { | |
232 | unsigned long ret; | |
233 | ||
234 | __asm__ __volatile__("rd %%asr24, %0" | |
235 | : "=r" (ret)); | |
236 | ||
237 | return ret & ~TICK_PRIV_BIT; | |
238 | } | |
239 | ||
240 | static unsigned long stick_get_compare(void) | |
241 | { | |
242 | unsigned long ret; | |
243 | ||
244 | __asm__ __volatile__("rd %%asr25, %0" | |
245 | : "=r" (ret)); | |
246 | ||
247 | return ret; | |
248 | } | |
249 | ||
250 | static unsigned long stick_add_tick(unsigned long adj, unsigned long offset) | |
251 | { | |
252 | unsigned long new_tick, tmp; | |
253 | ||
254 | __asm__ __volatile__("rd %%asr24, %0\n\t" | |
255 | "add %0, %2, %0\n\t" | |
256 | "wr %0, 0, %%asr24\n\t" | |
257 | "andn %0, %4, %1\n\t" | |
258 | "add %1, %3, %1\n\t" | |
259 | "wr %1, 0, %%asr25" | |
260 | : "=&r" (new_tick), "=&r" (tmp) | |
261 | : "r" (adj), "r" (offset), "r" (TICK_PRIV_BIT)); | |
262 | ||
263 | return new_tick; | |
264 | } | |
265 | ||
266 | static unsigned long stick_add_compare(unsigned long adj) | |
267 | { | |
268 | unsigned long new_compare; | |
269 | ||
270 | __asm__ __volatile__("rd %%asr25, %0\n\t" | |
271 | "add %0, %1, %0\n\t" | |
272 | "wr %0, 0, %%asr25" | |
273 | : "=&r" (new_compare) | |
274 | : "r" (adj)); | |
275 | ||
276 | return new_compare; | |
277 | } | |
278 | ||
d369ddd2 | 279 | static struct sparc64_tick_ops stick_operations __read_mostly = { |
1da177e4 LT |
280 | .init_tick = stick_init_tick, |
281 | .get_tick = stick_get_tick, | |
282 | .get_compare = stick_get_compare, | |
283 | .add_tick = stick_add_tick, | |
284 | .add_compare = stick_add_compare, | |
285 | .softint_mask = 1UL << 16, | |
286 | }; | |
287 | ||
288 | /* On Hummingbird the STICK/STICK_CMPR register is implemented | |
289 | * in I/O space. There are two 64-bit registers each, the | |
290 | * first holds the low 32-bits of the value and the second holds | |
291 | * the high 32-bits. | |
292 | * | |
293 | * Since STICK is constantly updating, we have to access it carefully. | |
294 | * | |
295 | * The sequence we use to read is: | |
296 | * 1) read low | |
297 | * 2) read high | |
298 | * 3) read low again, if it rolled over increment high by 1 | |
299 | * | |
300 | * Writing STICK safely is also tricky: | |
301 | * 1) write low to zero | |
302 | * 2) write high | |
303 | * 3) write low | |
304 | */ | |
305 | #define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL | |
306 | #define HBIRD_STICK_ADDR 0x1fe0000f070UL | |
307 | ||
308 | static unsigned long __hbird_read_stick(void) | |
309 | { | |
310 | unsigned long ret, tmp1, tmp2, tmp3; | |
311 | unsigned long addr = HBIRD_STICK_ADDR; | |
312 | ||
313 | __asm__ __volatile__("ldxa [%1] %5, %2\n\t" | |
314 | "add %1, 0x8, %1\n\t" | |
315 | "ldxa [%1] %5, %3\n\t" | |
316 | "sub %1, 0x8, %1\n\t" | |
317 | "ldxa [%1] %5, %4\n\t" | |
318 | "cmp %4, %2\n\t" | |
319 | "blu,a,pn %%xcc, 1f\n\t" | |
320 | " add %3, 1, %3\n" | |
321 | "1:\n\t" | |
322 | "sllx %3, 32, %3\n\t" | |
323 | "or %3, %4, %0\n\t" | |
324 | : "=&r" (ret), "=&r" (addr), | |
325 | "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3) | |
326 | : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr)); | |
327 | ||
328 | return ret; | |
329 | } | |
330 | ||
331 | static unsigned long __hbird_read_compare(void) | |
332 | { | |
333 | unsigned long low, high; | |
334 | unsigned long addr = HBIRD_STICKCMP_ADDR; | |
335 | ||
336 | __asm__ __volatile__("ldxa [%2] %3, %0\n\t" | |
337 | "add %2, 0x8, %2\n\t" | |
338 | "ldxa [%2] %3, %1" | |
339 | : "=&r" (low), "=&r" (high), "=&r" (addr) | |
340 | : "i" (ASI_PHYS_BYPASS_EC_E), "2" (addr)); | |
341 | ||
342 | return (high << 32UL) | low; | |
343 | } | |
344 | ||
345 | static void __hbird_write_stick(unsigned long val) | |
346 | { | |
347 | unsigned long low = (val & 0xffffffffUL); | |
348 | unsigned long high = (val >> 32UL); | |
349 | unsigned long addr = HBIRD_STICK_ADDR; | |
350 | ||
351 | __asm__ __volatile__("stxa %%g0, [%0] %4\n\t" | |
352 | "add %0, 0x8, %0\n\t" | |
353 | "stxa %3, [%0] %4\n\t" | |
354 | "sub %0, 0x8, %0\n\t" | |
355 | "stxa %2, [%0] %4" | |
356 | : "=&r" (addr) | |
357 | : "0" (addr), "r" (low), "r" (high), | |
358 | "i" (ASI_PHYS_BYPASS_EC_E)); | |
359 | } | |
360 | ||
361 | static void __hbird_write_compare(unsigned long val) | |
362 | { | |
363 | unsigned long low = (val & 0xffffffffUL); | |
364 | unsigned long high = (val >> 32UL); | |
365 | unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL; | |
366 | ||
367 | __asm__ __volatile__("stxa %3, [%0] %4\n\t" | |
368 | "sub %0, 0x8, %0\n\t" | |
369 | "stxa %2, [%0] %4" | |
370 | : "=&r" (addr) | |
371 | : "0" (addr), "r" (low), "r" (high), | |
372 | "i" (ASI_PHYS_BYPASS_EC_E)); | |
373 | } | |
374 | ||
375 | static void hbtick_init_tick(unsigned long offset) | |
376 | { | |
377 | unsigned long val; | |
378 | ||
379 | tick_disable_protection(); | |
380 | ||
381 | /* XXX This seems to be necessary to 'jumpstart' Hummingbird | |
382 | * XXX into actually sending STICK interrupts. I think because | |
383 | * XXX of how we store %tick_cmpr in head.S this somehow resets the | |
384 | * XXX {TICK + STICK} interrupt mux. -DaveM | |
385 | */ | |
386 | __hbird_write_stick(__hbird_read_stick()); | |
387 | ||
388 | val = __hbird_read_stick() & ~TICK_PRIV_BIT; | |
389 | __hbird_write_compare(val + offset); | |
390 | } | |
391 | ||
392 | static unsigned long hbtick_get_tick(void) | |
393 | { | |
394 | return __hbird_read_stick() & ~TICK_PRIV_BIT; | |
395 | } | |
396 | ||
397 | static unsigned long hbtick_get_compare(void) | |
398 | { | |
399 | return __hbird_read_compare(); | |
400 | } | |
401 | ||
402 | static unsigned long hbtick_add_tick(unsigned long adj, unsigned long offset) | |
403 | { | |
404 | unsigned long val; | |
405 | ||
406 | val = __hbird_read_stick() + adj; | |
407 | __hbird_write_stick(val); | |
408 | ||
409 | val &= ~TICK_PRIV_BIT; | |
410 | __hbird_write_compare(val + offset); | |
411 | ||
412 | return val; | |
413 | } | |
414 | ||
415 | static unsigned long hbtick_add_compare(unsigned long adj) | |
416 | { | |
417 | unsigned long val = __hbird_read_compare() + adj; | |
418 | ||
419 | val &= ~TICK_PRIV_BIT; | |
420 | __hbird_write_compare(val); | |
421 | ||
422 | return val; | |
423 | } | |
424 | ||
d369ddd2 | 425 | static struct sparc64_tick_ops hbtick_operations __read_mostly = { |
1da177e4 LT |
426 | .init_tick = hbtick_init_tick, |
427 | .get_tick = hbtick_get_tick, | |
428 | .get_compare = hbtick_get_compare, | |
429 | .add_tick = hbtick_add_tick, | |
430 | .add_compare = hbtick_add_compare, | |
431 | .softint_mask = 1UL << 0, | |
432 | }; | |
433 | ||
434 | /* timer_interrupt() needs to keep up the real-time clock, | |
435 | * as well as call the "do_timer()" routine every clocktick | |
436 | * | |
437 | * NOTE: On SUN5 systems the ticker interrupt comes in using 2 | |
438 | * interrupts, one at level14 and one with softint bit 0. | |
439 | */ | |
d369ddd2 | 440 | unsigned long timer_tick_offset __read_mostly; |
1da177e4 | 441 | |
d369ddd2 | 442 | static unsigned long timer_ticks_per_nsec_quotient __read_mostly; |
1da177e4 LT |
443 | |
444 | #define TICK_SIZE (tick_nsec / 1000) | |
445 | ||
446 | static inline void timer_check_rtc(void) | |
447 | { | |
448 | /* last time the cmos clock got updated */ | |
449 | static long last_rtc_update; | |
450 | ||
451 | /* Determine when to update the Mostek clock. */ | |
b149ee22 | 452 | if (ntp_synced() && |
1da177e4 LT |
453 | xtime.tv_sec > last_rtc_update + 660 && |
454 | (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && | |
455 | (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) { | |
456 | if (set_rtc_mmss(xtime.tv_sec) == 0) | |
457 | last_rtc_update = xtime.tv_sec; | |
458 | else | |
459 | last_rtc_update = xtime.tv_sec - 600; | |
460 | /* do it again in 60 s */ | |
461 | } | |
462 | } | |
463 | ||
464 | static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs) | |
465 | { | |
d369ddd2 | 466 | unsigned long ticks, compare, pstate; |
1da177e4 LT |
467 | |
468 | write_seqlock(&xtime_lock); | |
469 | ||
470 | do { | |
471 | #ifndef CONFIG_SMP | |
472 | profile_tick(CPU_PROFILING, regs); | |
473 | update_process_times(user_mode(regs)); | |
474 | #endif | |
475 | do_timer(regs); | |
476 | ||
477 | /* Guarantee that the following sequences execute | |
478 | * uninterrupted. | |
479 | */ | |
480 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" | |
481 | "wrpr %0, %1, %%pstate" | |
482 | : "=r" (pstate) | |
483 | : "i" (PSTATE_IE)); | |
484 | ||
d369ddd2 | 485 | compare = tick_ops->add_compare(timer_tick_offset); |
1da177e4 LT |
486 | ticks = tick_ops->get_tick(); |
487 | ||
488 | /* Restore PSTATE_IE. */ | |
489 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" | |
490 | : /* no outputs */ | |
491 | : "r" (pstate)); | |
d369ddd2 | 492 | } while (time_after_eq(ticks, compare)); |
1da177e4 LT |
493 | |
494 | timer_check_rtc(); | |
495 | ||
496 | write_sequnlock(&xtime_lock); | |
497 | ||
498 | return IRQ_HANDLED; | |
499 | } | |
500 | ||
501 | #ifdef CONFIG_SMP | |
502 | void timer_tick_interrupt(struct pt_regs *regs) | |
503 | { | |
504 | write_seqlock(&xtime_lock); | |
505 | ||
506 | do_timer(regs); | |
507 | ||
1da177e4 LT |
508 | timer_check_rtc(); |
509 | ||
510 | write_sequnlock(&xtime_lock); | |
511 | } | |
512 | #endif | |
513 | ||
514 | /* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */ | |
515 | static void __init kick_start_clock(void) | |
516 | { | |
ef0299bf | 517 | void __iomem *regs = mstk48t02_regs; |
1da177e4 LT |
518 | u8 sec, tmp; |
519 | int i, count; | |
520 | ||
521 | prom_printf("CLOCK: Clock was stopped. Kick start "); | |
522 | ||
523 | spin_lock_irq(&mostek_lock); | |
524 | ||
525 | /* Turn on the kick start bit to start the oscillator. */ | |
526 | tmp = mostek_read(regs + MOSTEK_CREG); | |
527 | tmp |= MSTK_CREG_WRITE; | |
528 | mostek_write(regs + MOSTEK_CREG, tmp); | |
529 | tmp = mostek_read(regs + MOSTEK_SEC); | |
530 | tmp &= ~MSTK_STOP; | |
531 | mostek_write(regs + MOSTEK_SEC, tmp); | |
532 | tmp = mostek_read(regs + MOSTEK_HOUR); | |
533 | tmp |= MSTK_KICK_START; | |
534 | mostek_write(regs + MOSTEK_HOUR, tmp); | |
535 | tmp = mostek_read(regs + MOSTEK_CREG); | |
536 | tmp &= ~MSTK_CREG_WRITE; | |
537 | mostek_write(regs + MOSTEK_CREG, tmp); | |
538 | ||
539 | spin_unlock_irq(&mostek_lock); | |
540 | ||
541 | /* Delay to allow the clock oscillator to start. */ | |
542 | sec = MSTK_REG_SEC(regs); | |
543 | for (i = 0; i < 3; i++) { | |
544 | while (sec == MSTK_REG_SEC(regs)) | |
545 | for (count = 0; count < 100000; count++) | |
546 | /* nothing */ ; | |
547 | prom_printf("."); | |
548 | sec = MSTK_REG_SEC(regs); | |
549 | } | |
550 | prom_printf("\n"); | |
551 | ||
552 | spin_lock_irq(&mostek_lock); | |
553 | ||
554 | /* Turn off kick start and set a "valid" time and date. */ | |
555 | tmp = mostek_read(regs + MOSTEK_CREG); | |
556 | tmp |= MSTK_CREG_WRITE; | |
557 | mostek_write(regs + MOSTEK_CREG, tmp); | |
558 | tmp = mostek_read(regs + MOSTEK_HOUR); | |
559 | tmp &= ~MSTK_KICK_START; | |
560 | mostek_write(regs + MOSTEK_HOUR, tmp); | |
561 | MSTK_SET_REG_SEC(regs,0); | |
562 | MSTK_SET_REG_MIN(regs,0); | |
563 | MSTK_SET_REG_HOUR(regs,0); | |
564 | MSTK_SET_REG_DOW(regs,5); | |
565 | MSTK_SET_REG_DOM(regs,1); | |
566 | MSTK_SET_REG_MONTH(regs,8); | |
567 | MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO); | |
568 | tmp = mostek_read(regs + MOSTEK_CREG); | |
569 | tmp &= ~MSTK_CREG_WRITE; | |
570 | mostek_write(regs + MOSTEK_CREG, tmp); | |
571 | ||
572 | spin_unlock_irq(&mostek_lock); | |
573 | ||
574 | /* Ensure the kick start bit is off. If it isn't, turn it off. */ | |
575 | while (mostek_read(regs + MOSTEK_HOUR) & MSTK_KICK_START) { | |
576 | prom_printf("CLOCK: Kick start still on!\n"); | |
577 | ||
578 | spin_lock_irq(&mostek_lock); | |
579 | ||
580 | tmp = mostek_read(regs + MOSTEK_CREG); | |
581 | tmp |= MSTK_CREG_WRITE; | |
582 | mostek_write(regs + MOSTEK_CREG, tmp); | |
583 | ||
584 | tmp = mostek_read(regs + MOSTEK_HOUR); | |
585 | tmp &= ~MSTK_KICK_START; | |
586 | mostek_write(regs + MOSTEK_HOUR, tmp); | |
587 | ||
588 | tmp = mostek_read(regs + MOSTEK_CREG); | |
589 | tmp &= ~MSTK_CREG_WRITE; | |
590 | mostek_write(regs + MOSTEK_CREG, tmp); | |
591 | ||
592 | spin_unlock_irq(&mostek_lock); | |
593 | } | |
594 | ||
595 | prom_printf("CLOCK: Kick start procedure successful.\n"); | |
596 | } | |
597 | ||
598 | /* Return nonzero if the clock chip battery is low. */ | |
599 | static int __init has_low_battery(void) | |
600 | { | |
ef0299bf | 601 | void __iomem *regs = mstk48t02_regs; |
1da177e4 LT |
602 | u8 data1, data2; |
603 | ||
604 | spin_lock_irq(&mostek_lock); | |
605 | ||
606 | data1 = mostek_read(regs + MOSTEK_EEPROM); /* Read some data. */ | |
607 | mostek_write(regs + MOSTEK_EEPROM, ~data1); /* Write back the complement. */ | |
608 | data2 = mostek_read(regs + MOSTEK_EEPROM); /* Read back the complement. */ | |
609 | mostek_write(regs + MOSTEK_EEPROM, data1); /* Restore original value. */ | |
610 | ||
611 | spin_unlock_irq(&mostek_lock); | |
612 | ||
613 | return (data1 == data2); /* Was the write blocked? */ | |
614 | } | |
615 | ||
616 | /* Probe for the real time clock chip. */ | |
617 | static void __init set_system_time(void) | |
618 | { | |
619 | unsigned int year, mon, day, hour, min, sec; | |
ef0299bf | 620 | void __iomem *mregs = mstk48t02_regs; |
1da177e4 LT |
621 | #ifdef CONFIG_PCI |
622 | unsigned long dregs = ds1287_regs; | |
623 | #else | |
624 | unsigned long dregs = 0UL; | |
625 | #endif | |
626 | u8 tmp; | |
627 | ||
628 | if (!mregs && !dregs) { | |
629 | prom_printf("Something wrong, clock regs not mapped yet.\n"); | |
630 | prom_halt(); | |
631 | } | |
632 | ||
633 | if (mregs) { | |
634 | spin_lock_irq(&mostek_lock); | |
635 | ||
636 | /* Traditional Mostek chip. */ | |
637 | tmp = mostek_read(mregs + MOSTEK_CREG); | |
638 | tmp |= MSTK_CREG_READ; | |
639 | mostek_write(mregs + MOSTEK_CREG, tmp); | |
640 | ||
641 | sec = MSTK_REG_SEC(mregs); | |
642 | min = MSTK_REG_MIN(mregs); | |
643 | hour = MSTK_REG_HOUR(mregs); | |
644 | day = MSTK_REG_DOM(mregs); | |
645 | mon = MSTK_REG_MONTH(mregs); | |
646 | year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) ); | |
647 | } else { | |
648 | int i; | |
649 | ||
650 | /* Dallas 12887 RTC chip. */ | |
651 | ||
652 | /* Stolen from arch/i386/kernel/time.c, see there for | |
653 | * credits and descriptive comments. | |
654 | */ | |
655 | for (i = 0; i < 1000000; i++) { | |
656 | if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP) | |
657 | break; | |
658 | udelay(10); | |
659 | } | |
660 | for (i = 0; i < 1000000; i++) { | |
661 | if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)) | |
662 | break; | |
663 | udelay(10); | |
664 | } | |
665 | do { | |
666 | sec = CMOS_READ(RTC_SECONDS); | |
667 | min = CMOS_READ(RTC_MINUTES); | |
668 | hour = CMOS_READ(RTC_HOURS); | |
669 | day = CMOS_READ(RTC_DAY_OF_MONTH); | |
670 | mon = CMOS_READ(RTC_MONTH); | |
671 | year = CMOS_READ(RTC_YEAR); | |
672 | } while (sec != CMOS_READ(RTC_SECONDS)); | |
673 | if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { | |
674 | BCD_TO_BIN(sec); | |
675 | BCD_TO_BIN(min); | |
676 | BCD_TO_BIN(hour); | |
677 | BCD_TO_BIN(day); | |
678 | BCD_TO_BIN(mon); | |
679 | BCD_TO_BIN(year); | |
680 | } | |
681 | if ((year += 1900) < 1970) | |
682 | year += 100; | |
683 | } | |
684 | ||
685 | xtime.tv_sec = mktime(year, mon, day, hour, min, sec); | |
686 | xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ); | |
687 | set_normalized_timespec(&wall_to_monotonic, | |
688 | -xtime.tv_sec, -xtime.tv_nsec); | |
689 | ||
690 | if (mregs) { | |
691 | tmp = mostek_read(mregs + MOSTEK_CREG); | |
692 | tmp &= ~MSTK_CREG_READ; | |
693 | mostek_write(mregs + MOSTEK_CREG, tmp); | |
694 | ||
695 | spin_unlock_irq(&mostek_lock); | |
696 | } | |
697 | } | |
698 | ||
699 | void __init clock_probe(void) | |
700 | { | |
701 | struct linux_prom_registers clk_reg[2]; | |
702 | char model[128]; | |
703 | int node, busnd = -1, err; | |
704 | unsigned long flags; | |
705 | struct linux_central *cbus; | |
706 | #ifdef CONFIG_PCI | |
707 | struct linux_ebus *ebus = NULL; | |
708 | struct sparc_isa_bridge *isa_br = NULL; | |
709 | #endif | |
710 | static int invoked; | |
711 | ||
712 | if (invoked) | |
713 | return; | |
714 | invoked = 1; | |
715 | ||
716 | ||
717 | if (this_is_starfire) { | |
718 | /* davem suggests we keep this within the 4M locked kernel image */ | |
719 | static char obp_gettod[256]; | |
720 | static u32 unix_tod; | |
721 | ||
722 | sprintf(obp_gettod, "h# %08x unix-gettod", | |
723 | (unsigned int) (long) &unix_tod); | |
724 | prom_feval(obp_gettod); | |
725 | xtime.tv_sec = unix_tod; | |
726 | xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ); | |
727 | set_normalized_timespec(&wall_to_monotonic, | |
728 | -xtime.tv_sec, -xtime.tv_nsec); | |
729 | return; | |
730 | } | |
731 | ||
732 | local_irq_save(flags); | |
733 | ||
734 | cbus = central_bus; | |
735 | if (cbus != NULL) | |
736 | busnd = central_bus->child->prom_node; | |
737 | ||
738 | /* Check FHC Central then EBUSs then ISA bridges then SBUSs. | |
739 | * That way we handle the presence of multiple properly. | |
740 | * | |
741 | * As a special case, machines with Central must provide the | |
742 | * timer chip there. | |
743 | */ | |
744 | #ifdef CONFIG_PCI | |
745 | if (ebus_chain != NULL) { | |
746 | ebus = ebus_chain; | |
747 | if (busnd == -1) | |
748 | busnd = ebus->prom_node; | |
749 | } | |
750 | if (isa_chain != NULL) { | |
751 | isa_br = isa_chain; | |
752 | if (busnd == -1) | |
753 | busnd = isa_br->prom_node; | |
754 | } | |
755 | #endif | |
756 | if (sbus_root != NULL && busnd == -1) | |
757 | busnd = sbus_root->prom_node; | |
758 | ||
759 | if (busnd == -1) { | |
760 | prom_printf("clock_probe: problem, cannot find bus to search.\n"); | |
761 | prom_halt(); | |
762 | } | |
763 | ||
764 | node = prom_getchild(busnd); | |
765 | ||
766 | while (1) { | |
767 | if (!node) | |
768 | model[0] = 0; | |
769 | else | |
770 | prom_getstring(node, "model", model, sizeof(model)); | |
771 | if (strcmp(model, "mk48t02") && | |
772 | strcmp(model, "mk48t08") && | |
773 | strcmp(model, "mk48t59") && | |
774 | strcmp(model, "m5819") && | |
775 | strcmp(model, "m5819p") && | |
776 | strcmp(model, "m5823") && | |
777 | strcmp(model, "ds1287")) { | |
778 | if (cbus != NULL) { | |
779 | prom_printf("clock_probe: Central bus lacks timer chip.\n"); | |
780 | prom_halt(); | |
781 | } | |
782 | ||
783 | if (node != 0) | |
784 | node = prom_getsibling(node); | |
785 | #ifdef CONFIG_PCI | |
786 | while ((node == 0) && ebus != NULL) { | |
787 | ebus = ebus->next; | |
788 | if (ebus != NULL) { | |
789 | busnd = ebus->prom_node; | |
790 | node = prom_getchild(busnd); | |
791 | } | |
792 | } | |
793 | while ((node == 0) && isa_br != NULL) { | |
794 | isa_br = isa_br->next; | |
795 | if (isa_br != NULL) { | |
796 | busnd = isa_br->prom_node; | |
797 | node = prom_getchild(busnd); | |
798 | } | |
799 | } | |
800 | #endif | |
801 | if (node == 0) { | |
802 | prom_printf("clock_probe: Cannot find timer chip\n"); | |
803 | prom_halt(); | |
804 | } | |
805 | continue; | |
806 | } | |
807 | ||
808 | err = prom_getproperty(node, "reg", (char *)clk_reg, | |
809 | sizeof(clk_reg)); | |
810 | if(err == -1) { | |
811 | prom_printf("clock_probe: Cannot get Mostek reg property\n"); | |
812 | prom_halt(); | |
813 | } | |
814 | ||
815 | if (cbus != NULL) { | |
816 | apply_fhc_ranges(central_bus->child, clk_reg, 1); | |
817 | apply_central_ranges(central_bus, clk_reg, 1); | |
818 | } | |
819 | #ifdef CONFIG_PCI | |
820 | else if (ebus != NULL) { | |
821 | struct linux_ebus_device *edev; | |
822 | ||
823 | for_each_ebusdev(edev, ebus) | |
824 | if (edev->prom_node == node) | |
825 | break; | |
826 | if (edev == NULL) { | |
827 | if (isa_chain != NULL) | |
828 | goto try_isa_clock; | |
829 | prom_printf("%s: Mostek not probed by EBUS\n", | |
830 | __FUNCTION__); | |
831 | prom_halt(); | |
832 | } | |
833 | ||
834 | if (!strcmp(model, "ds1287") || | |
835 | !strcmp(model, "m5819") || | |
836 | !strcmp(model, "m5819p") || | |
837 | !strcmp(model, "m5823")) { | |
838 | ds1287_regs = edev->resource[0].start; | |
839 | } else { | |
ef0299bf | 840 | mstk48t59_regs = (void __iomem *) |
b4bca26c | 841 | edev->resource[0].start; |
1da177e4 LT |
842 | mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02; |
843 | } | |
844 | break; | |
845 | } | |
846 | else if (isa_br != NULL) { | |
847 | struct sparc_isa_device *isadev; | |
848 | ||
849 | try_isa_clock: | |
850 | for_each_isadev(isadev, isa_br) | |
851 | if (isadev->prom_node == node) | |
852 | break; | |
853 | if (isadev == NULL) { | |
854 | prom_printf("%s: Mostek not probed by ISA\n"); | |
855 | prom_halt(); | |
856 | } | |
857 | if (!strcmp(model, "ds1287") || | |
858 | !strcmp(model, "m5819") || | |
859 | !strcmp(model, "m5819p") || | |
860 | !strcmp(model, "m5823")) { | |
861 | ds1287_regs = isadev->resource.start; | |
862 | } else { | |
ef0299bf | 863 | mstk48t59_regs = (void __iomem *) |
b4bca26c | 864 | isadev->resource.start; |
1da177e4 LT |
865 | mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02; |
866 | } | |
867 | break; | |
868 | } | |
869 | #endif | |
870 | else { | |
871 | if (sbus_root->num_sbus_ranges) { | |
872 | int nranges = sbus_root->num_sbus_ranges; | |
873 | int rngc; | |
874 | ||
875 | for (rngc = 0; rngc < nranges; rngc++) | |
876 | if (clk_reg[0].which_io == | |
877 | sbus_root->sbus_ranges[rngc].ot_child_space) | |
878 | break; | |
879 | if (rngc == nranges) { | |
880 | prom_printf("clock_probe: Cannot find ranges for " | |
881 | "clock regs.\n"); | |
882 | prom_halt(); | |
883 | } | |
884 | clk_reg[0].which_io = | |
885 | sbus_root->sbus_ranges[rngc].ot_parent_space; | |
886 | clk_reg[0].phys_addr += | |
887 | sbus_root->sbus_ranges[rngc].ot_parent_base; | |
888 | } | |
889 | } | |
890 | ||
891 | if(model[5] == '0' && model[6] == '2') { | |
ef0299bf | 892 | mstk48t02_regs = (void __iomem *) |
b4bca26c DM |
893 | (((u64)clk_reg[0].phys_addr) | |
894 | (((u64)clk_reg[0].which_io)<<32UL)); | |
1da177e4 | 895 | } else if(model[5] == '0' && model[6] == '8') { |
ef0299bf | 896 | mstk48t08_regs = (void __iomem *) |
b4bca26c DM |
897 | (((u64)clk_reg[0].phys_addr) | |
898 | (((u64)clk_reg[0].which_io)<<32UL)); | |
1da177e4 LT |
899 | mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02; |
900 | } else { | |
ef0299bf | 901 | mstk48t59_regs = (void __iomem *) |
b4bca26c DM |
902 | (((u64)clk_reg[0].phys_addr) | |
903 | (((u64)clk_reg[0].which_io)<<32UL)); | |
1da177e4 LT |
904 | mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02; |
905 | } | |
906 | break; | |
907 | } | |
908 | ||
b4bca26c | 909 | if (mstk48t02_regs != NULL) { |
1da177e4 LT |
910 | /* Report a low battery voltage condition. */ |
911 | if (has_low_battery()) | |
912 | prom_printf("NVRAM: Low battery voltage!\n"); | |
913 | ||
914 | /* Kick start the clock if it is completely stopped. */ | |
915 | if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP) | |
916 | kick_start_clock(); | |
917 | } | |
918 | ||
919 | set_system_time(); | |
920 | ||
921 | local_irq_restore(flags); | |
922 | } | |
923 | ||
924 | /* This is gets the master TICK_INT timer going. */ | |
925 | static unsigned long sparc64_init_timers(void) | |
926 | { | |
927 | unsigned long clock; | |
928 | int node; | |
929 | #ifdef CONFIG_SMP | |
930 | extern void smp_tick_init(void); | |
931 | #endif | |
932 | ||
933 | if (tlb_type == spitfire) { | |
934 | unsigned long ver, manuf, impl; | |
935 | ||
936 | __asm__ __volatile__ ("rdpr %%ver, %0" | |
937 | : "=&r" (ver)); | |
938 | manuf = ((ver >> 48) & 0xffff); | |
939 | impl = ((ver >> 32) & 0xffff); | |
940 | if (manuf == 0x17 && impl == 0x13) { | |
941 | /* Hummingbird, aka Ultra-IIe */ | |
942 | tick_ops = &hbtick_operations; | |
943 | node = prom_root_node; | |
944 | clock = prom_getint(node, "stick-frequency"); | |
945 | } else { | |
946 | tick_ops = &tick_operations; | |
947 | cpu_find_by_instance(0, &node, NULL); | |
948 | clock = prom_getint(node, "clock-frequency"); | |
949 | } | |
950 | } else { | |
951 | tick_ops = &stick_operations; | |
952 | node = prom_root_node; | |
953 | clock = prom_getint(node, "stick-frequency"); | |
954 | } | |
955 | timer_tick_offset = clock / HZ; | |
956 | ||
957 | #ifdef CONFIG_SMP | |
958 | smp_tick_init(); | |
959 | #endif | |
960 | ||
961 | return clock; | |
962 | } | |
963 | ||
964 | static void sparc64_start_timers(irqreturn_t (*cfunc)(int, void *, struct pt_regs *)) | |
965 | { | |
966 | unsigned long pstate; | |
967 | int err; | |
968 | ||
969 | /* Register IRQ handler. */ | |
088dd1f8 | 970 | err = request_irq(build_irq(0, 0, 0UL, 0UL), cfunc, 0, |
1da177e4 LT |
971 | "timer", NULL); |
972 | ||
973 | if (err) { | |
974 | prom_printf("Serious problem, cannot register TICK_INT\n"); | |
975 | prom_halt(); | |
976 | } | |
977 | ||
978 | /* Guarantee that the following sequences execute | |
979 | * uninterrupted. | |
980 | */ | |
981 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" | |
982 | "wrpr %0, %1, %%pstate" | |
983 | : "=r" (pstate) | |
984 | : "i" (PSTATE_IE)); | |
985 | ||
986 | tick_ops->init_tick(timer_tick_offset); | |
987 | ||
988 | /* Restore PSTATE_IE. */ | |
989 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" | |
990 | : /* no outputs */ | |
991 | : "r" (pstate)); | |
992 | ||
993 | local_irq_enable(); | |
994 | } | |
995 | ||
996 | struct freq_table { | |
997 | unsigned long udelay_val_ref; | |
998 | unsigned long clock_tick_ref; | |
999 | unsigned int ref_freq; | |
1000 | }; | |
1001 | static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0, 0 }; | |
1002 | ||
1003 | unsigned long sparc64_get_clock_tick(unsigned int cpu) | |
1004 | { | |
1005 | struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu); | |
1006 | ||
1007 | if (ft->clock_tick_ref) | |
1008 | return ft->clock_tick_ref; | |
1009 | return cpu_data(cpu).clock_tick; | |
1010 | } | |
1011 | ||
1012 | #ifdef CONFIG_CPU_FREQ | |
1013 | ||
1014 | static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val, | |
1015 | void *data) | |
1016 | { | |
1017 | struct cpufreq_freqs *freq = data; | |
1018 | unsigned int cpu = freq->cpu; | |
1019 | struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu); | |
1020 | ||
1021 | if (!ft->ref_freq) { | |
1022 | ft->ref_freq = freq->old; | |
1023 | ft->udelay_val_ref = cpu_data(cpu).udelay_val; | |
1024 | ft->clock_tick_ref = cpu_data(cpu).clock_tick; | |
1025 | } | |
1026 | if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) || | |
1027 | (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) || | |
1028 | (val == CPUFREQ_RESUMECHANGE)) { | |
1029 | cpu_data(cpu).udelay_val = | |
1030 | cpufreq_scale(ft->udelay_val_ref, | |
1031 | ft->ref_freq, | |
1032 | freq->new); | |
1033 | cpu_data(cpu).clock_tick = | |
1034 | cpufreq_scale(ft->clock_tick_ref, | |
1035 | ft->ref_freq, | |
1036 | freq->new); | |
1037 | } | |
1038 | ||
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | static struct notifier_block sparc64_cpufreq_notifier_block = { | |
1043 | .notifier_call = sparc64_cpufreq_notifier | |
1044 | }; | |
1045 | ||
1046 | #endif /* CONFIG_CPU_FREQ */ | |
1047 | ||
1048 | static struct time_interpolator sparc64_cpu_interpolator = { | |
1049 | .source = TIME_SOURCE_CPU, | |
1050 | .shift = 16, | |
1051 | .mask = 0xffffffffffffffffLL | |
1052 | }; | |
1053 | ||
1054 | /* The quotient formula is taken from the IA64 port. */ | |
1055 | #define SPARC64_NSEC_PER_CYC_SHIFT 30UL | |
1056 | void __init time_init(void) | |
1057 | { | |
1058 | unsigned long clock = sparc64_init_timers(); | |
1059 | ||
1060 | sparc64_cpu_interpolator.frequency = clock; | |
1061 | register_time_interpolator(&sparc64_cpu_interpolator); | |
1062 | ||
1063 | /* Now that the interpolator is registered, it is | |
1064 | * safe to start the timer ticking. | |
1065 | */ | |
1066 | sparc64_start_timers(timer_interrupt); | |
1067 | ||
1068 | timer_ticks_per_nsec_quotient = | |
1069 | (((NSEC_PER_SEC << SPARC64_NSEC_PER_CYC_SHIFT) + | |
1070 | (clock / 2)) / clock); | |
1071 | ||
1072 | #ifdef CONFIG_CPU_FREQ | |
1073 | cpufreq_register_notifier(&sparc64_cpufreq_notifier_block, | |
1074 | CPUFREQ_TRANSITION_NOTIFIER); | |
1075 | #endif | |
1076 | } | |
1077 | ||
1078 | unsigned long long sched_clock(void) | |
1079 | { | |
1080 | unsigned long ticks = tick_ops->get_tick(); | |
1081 | ||
1082 | return (ticks * timer_ticks_per_nsec_quotient) | |
1083 | >> SPARC64_NSEC_PER_CYC_SHIFT; | |
1084 | } | |
1085 | ||
1086 | static int set_rtc_mmss(unsigned long nowtime) | |
1087 | { | |
1088 | int real_seconds, real_minutes, chip_minutes; | |
ef0299bf | 1089 | void __iomem *mregs = mstk48t02_regs; |
1da177e4 LT |
1090 | #ifdef CONFIG_PCI |
1091 | unsigned long dregs = ds1287_regs; | |
1092 | #else | |
1093 | unsigned long dregs = 0UL; | |
1094 | #endif | |
1095 | unsigned long flags; | |
1096 | u8 tmp; | |
1097 | ||
1098 | /* | |
1099 | * Not having a register set can lead to trouble. | |
1100 | * Also starfire doesn't have a tod clock. | |
1101 | */ | |
1102 | if (!mregs && !dregs) | |
1103 | return -1; | |
1104 | ||
1105 | if (mregs) { | |
1106 | spin_lock_irqsave(&mostek_lock, flags); | |
1107 | ||
1108 | /* Read the current RTC minutes. */ | |
1109 | tmp = mostek_read(mregs + MOSTEK_CREG); | |
1110 | tmp |= MSTK_CREG_READ; | |
1111 | mostek_write(mregs + MOSTEK_CREG, tmp); | |
1112 | ||
1113 | chip_minutes = MSTK_REG_MIN(mregs); | |
1114 | ||
1115 | tmp = mostek_read(mregs + MOSTEK_CREG); | |
1116 | tmp &= ~MSTK_CREG_READ; | |
1117 | mostek_write(mregs + MOSTEK_CREG, tmp); | |
1118 | ||
1119 | /* | |
1120 | * since we're only adjusting minutes and seconds, | |
1121 | * don't interfere with hour overflow. This avoids | |
1122 | * messing with unknown time zones but requires your | |
1123 | * RTC not to be off by more than 15 minutes | |
1124 | */ | |
1125 | real_seconds = nowtime % 60; | |
1126 | real_minutes = nowtime / 60; | |
1127 | if (((abs(real_minutes - chip_minutes) + 15)/30) & 1) | |
1128 | real_minutes += 30; /* correct for half hour time zone */ | |
1129 | real_minutes %= 60; | |
1130 | ||
1131 | if (abs(real_minutes - chip_minutes) < 30) { | |
1132 | tmp = mostek_read(mregs + MOSTEK_CREG); | |
1133 | tmp |= MSTK_CREG_WRITE; | |
1134 | mostek_write(mregs + MOSTEK_CREG, tmp); | |
1135 | ||
1136 | MSTK_SET_REG_SEC(mregs,real_seconds); | |
1137 | MSTK_SET_REG_MIN(mregs,real_minutes); | |
1138 | ||
1139 | tmp = mostek_read(mregs + MOSTEK_CREG); | |
1140 | tmp &= ~MSTK_CREG_WRITE; | |
1141 | mostek_write(mregs + MOSTEK_CREG, tmp); | |
1142 | ||
1143 | spin_unlock_irqrestore(&mostek_lock, flags); | |
1144 | ||
1145 | return 0; | |
1146 | } else { | |
1147 | spin_unlock_irqrestore(&mostek_lock, flags); | |
1148 | ||
1149 | return -1; | |
1150 | } | |
1151 | } else { | |
1152 | int retval = 0; | |
1153 | unsigned char save_control, save_freq_select; | |
1154 | ||
1155 | /* Stolen from arch/i386/kernel/time.c, see there for | |
1156 | * credits and descriptive comments. | |
1157 | */ | |
1158 | spin_lock_irqsave(&rtc_lock, flags); | |
1159 | save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */ | |
1160 | CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); | |
1161 | ||
1162 | save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */ | |
1163 | CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); | |
1164 | ||
1165 | chip_minutes = CMOS_READ(RTC_MINUTES); | |
1166 | if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
1167 | BCD_TO_BIN(chip_minutes); | |
1168 | real_seconds = nowtime % 60; | |
1169 | real_minutes = nowtime / 60; | |
1170 | if (((abs(real_minutes - chip_minutes) + 15)/30) & 1) | |
1171 | real_minutes += 30; | |
1172 | real_minutes %= 60; | |
1173 | ||
1174 | if (abs(real_minutes - chip_minutes) < 30) { | |
1175 | if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { | |
1176 | BIN_TO_BCD(real_seconds); | |
1177 | BIN_TO_BCD(real_minutes); | |
1178 | } | |
1179 | CMOS_WRITE(real_seconds,RTC_SECONDS); | |
1180 | CMOS_WRITE(real_minutes,RTC_MINUTES); | |
1181 | } else { | |
1182 | printk(KERN_WARNING | |
1183 | "set_rtc_mmss: can't update from %d to %d\n", | |
1184 | chip_minutes, real_minutes); | |
1185 | retval = -1; | |
1186 | } | |
1187 | ||
1188 | CMOS_WRITE(save_control, RTC_CONTROL); | |
1189 | CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); | |
1190 | spin_unlock_irqrestore(&rtc_lock, flags); | |
1191 | ||
1192 | return retval; | |
1193 | } | |
1194 | } |