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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / arch / sparc64 / kernel / time.c
blobe5d238970c7ec60e7d52a04495ffb7eb725340c5
1 /* time.c: UltraSparc timer and TOD clock support.
2 *
3 * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
5 *
6 * Based largely on code which is:
7 *
8 * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
9 */
10
11 #include <linux/errno.h>
12 #include <linux/module.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/param.h>
16 #include <linux/string.h>
17 #include <linux/mm.h>
18 #include <linux/interrupt.h>
19 #include <linux/time.h>
20 #include <linux/timex.h>
21 #include <linux/init.h>
22 #include <linux/ioport.h>
23 #include <linux/mc146818rtc.h>
24 #include <linux/delay.h>
25 #include <linux/profile.h>
26 #include <linux/bcd.h>
27 #include <linux/jiffies.h>
28 #include <linux/cpufreq.h>
29 #include <linux/percpu.h>
30 #include <linux/miscdevice.h>
31 #include <linux/rtc.h>
32 #include <linux/kernel_stat.h>
33 #include <linux/clockchips.h>
34 #include <linux/clocksource.h>
35
36 #include <asm/oplib.h>
37 #include <asm/mostek.h>
38 #include <asm/timer.h>
39 #include <asm/irq.h>
40 #include <asm/io.h>
41 #include <asm/prom.h>
42 #include <asm/of_device.h>
43 #include <asm/starfire.h>
44 #include <asm/smp.h>
45 #include <asm/sections.h>
46 #include <asm/cpudata.h>
47 #include <asm/uaccess.h>
48 #include <asm/irq_regs.h>
49
50 #include "entry.h"
51
52 DEFINE_SPINLOCK(mostek_lock);
53 DEFINE_SPINLOCK(rtc_lock);
54 void __iomem *mstk48t02_regs = NULL;
55 #ifdef CONFIG_PCI
56 unsigned long ds1287_regs = 0UL;
57 static void __iomem *bq4802_regs;
58 #endif
59
60 static void __iomem *mstk48t08_regs;
61 static void __iomem *mstk48t59_regs;
62
63 static int set_rtc_mmss(unsigned long);
64
65 #define TICK_PRIV_BIT (1UL << 63)
66 #define TICKCMP_IRQ_BIT (1UL << 63)
67
68 #ifdef CONFIG_SMP
69 unsigned long profile_pc(struct pt_regs *regs)
70 {
71 unsigned long pc = instruction_pointer(regs);
72
73 if (in_lock_functions(pc))
74 return regs->u_regs[UREG_RETPC];
75 return pc;
76 }
77 EXPORT_SYMBOL(profile_pc);
78 #endif
79
80 static void tick_disable_protection(void)
81 {
82 /* Set things up so user can access tick register for profiling
83 * purposes. Also workaround BB_ERRATA_1 by doing a dummy
84 * read back of %tick after writing it.
85 */
86 __asm__ __volatile__(
87 " ba,pt %%xcc, 1f\n"
88 " nop\n"
89 " .align 64\n"
90 "1: rd %%tick, %%g2\n"
91 " add %%g2, 6, %%g2\n"
92 " andn %%g2, %0, %%g2\n"
93 " wrpr %%g2, 0, %%tick\n"
94 " rdpr %%tick, %%g0"
95 : /* no outputs */
96 : "r" (TICK_PRIV_BIT)
97 : "g2");
98 }
99
100 static void tick_disable_irq(void)
101 {
102 __asm__ __volatile__(
103 " ba,pt %%xcc, 1f\n"
104 " nop\n"
105 " .align 64\n"
106 "1: wr %0, 0x0, %%tick_cmpr\n"
107 " rd %%tick_cmpr, %%g0"
108 : /* no outputs */
109 : "r" (TICKCMP_IRQ_BIT));
110 }
111
112 static void tick_init_tick(void)
113 {
114 tick_disable_protection();
115 tick_disable_irq();
116 }
117
118 static unsigned long tick_get_tick(void)
119 {
120 unsigned long ret;
121
122 __asm__ __volatile__("rd %%tick, %0\n\t"
123 "mov %0, %0"
124 : "=r" (ret));
125
126 return ret & ~TICK_PRIV_BIT;
127 }
128
129 static int tick_add_compare(unsigned long adj)
130 {
131 unsigned long orig_tick, new_tick, new_compare;
132
133 __asm__ __volatile__("rd %%tick, %0"
134 : "=r" (orig_tick));
135
136 orig_tick &= ~TICKCMP_IRQ_BIT;
137
138 /* Workaround for Spitfire Errata (#54 I think??), I discovered
139 * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
140 * number 103640.
141 *
142 * On Blackbird writes to %tick_cmpr can fail, the
143 * workaround seems to be to execute the wr instruction
144 * at the start of an I-cache line, and perform a dummy
145 * read back from %tick_cmpr right after writing to it. -DaveM
146 */
147 __asm__ __volatile__("ba,pt %%xcc, 1f\n\t"
148 " add %1, %2, %0\n\t"
149 ".align 64\n"
150 "1:\n\t"
151 "wr %0, 0, %%tick_cmpr\n\t"
152 "rd %%tick_cmpr, %%g0\n\t"
153 : "=r" (new_compare)
154 : "r" (orig_tick), "r" (adj));
155
156 __asm__ __volatile__("rd %%tick, %0"
157 : "=r" (new_tick));
158 new_tick &= ~TICKCMP_IRQ_BIT;
159
160 return ((long)(new_tick - (orig_tick+adj))) > 0L;
161 }
162
163 static unsigned long tick_add_tick(unsigned long adj)
164 {
165 unsigned long new_tick;
166
167 /* Also need to handle Blackbird bug here too. */
168 __asm__ __volatile__("rd %%tick, %0\n\t"
169 "add %0, %1, %0\n\t"
170 "wrpr %0, 0, %%tick\n\t"
171 : "=&r" (new_tick)
172 : "r" (adj));
173
174 return new_tick;
175 }
176
177 static struct sparc64_tick_ops tick_operations __read_mostly = {
178 .name = "tick",
179 .init_tick = tick_init_tick,
180 .disable_irq = tick_disable_irq,
181 .get_tick = tick_get_tick,
182 .add_tick = tick_add_tick,
183 .add_compare = tick_add_compare,
184 .softint_mask = 1UL << 0,
185 };
186
187 struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
188
189 static void stick_disable_irq(void)
190 {
191 __asm__ __volatile__(
192 "wr %0, 0x0, %%asr25"
193 : /* no outputs */
194 : "r" (TICKCMP_IRQ_BIT));
195 }
196
197 static void stick_init_tick(void)
198 {
199 /* Writes to the %tick and %stick register are not
200 * allowed on sun4v. The Hypervisor controls that
201 * bit, per-strand.
202 */
203 if (tlb_type != hypervisor) {
204 tick_disable_protection();
205 tick_disable_irq();
206
207 /* Let the user get at STICK too. */
208 __asm__ __volatile__(
209 " rd %%asr24, %%g2\n"
210 " andn %%g2, %0, %%g2\n"
211 " wr %%g2, 0, %%asr24"
212 : /* no outputs */
213 : "r" (TICK_PRIV_BIT)
214 : "g1", "g2");
215 }
216
217 stick_disable_irq();
218 }
219
220 static unsigned long stick_get_tick(void)
221 {
222 unsigned long ret;
223
224 __asm__ __volatile__("rd %%asr24, %0"
225 : "=r" (ret));
226
227 return ret & ~TICK_PRIV_BIT;
228 }
229
230 static unsigned long stick_add_tick(unsigned long adj)
231 {
232 unsigned long new_tick;
233
234 __asm__ __volatile__("rd %%asr24, %0\n\t"
235 "add %0, %1, %0\n\t"
236 "wr %0, 0, %%asr24\n\t"
237 : "=&r" (new_tick)
238 : "r" (adj));
239
240 return new_tick;
241 }
242
243 static int stick_add_compare(unsigned long adj)
244 {
245 unsigned long orig_tick, new_tick;
246
247 __asm__ __volatile__("rd %%asr24, %0"
248 : "=r" (orig_tick));
249 orig_tick &= ~TICKCMP_IRQ_BIT;
250
251 __asm__ __volatile__("wr %0, 0, %%asr25"
252 : /* no outputs */
253 : "r" (orig_tick + adj));
254
255 __asm__ __volatile__("rd %%asr24, %0"
256 : "=r" (new_tick));
257 new_tick &= ~TICKCMP_IRQ_BIT;
258
259 return ((long)(new_tick - (orig_tick+adj))) > 0L;
260 }
261
262 static struct sparc64_tick_ops stick_operations __read_mostly = {
263 .name = "stick",
264 .init_tick = stick_init_tick,
265 .disable_irq = stick_disable_irq,
266 .get_tick = stick_get_tick,
267 .add_tick = stick_add_tick,
268 .add_compare = stick_add_compare,
269 .softint_mask = 1UL << 16,
270 };
271
272 /* On Hummingbird the STICK/STICK_CMPR register is implemented
273 * in I/O space. There are two 64-bit registers each, the
274 * first holds the low 32-bits of the value and the second holds
275 * the high 32-bits.
276 *
277 * Since STICK is constantly updating, we have to access it carefully.
278 *
279 * The sequence we use to read is:
280 * 1) read high
281 * 2) read low
282 * 3) read high again, if it rolled re-read both low and high again.
283 *
284 * Writing STICK safely is also tricky:
285 * 1) write low to zero
286 * 2) write high
287 * 3) write low
288 */
289 #define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL
290 #define HBIRD_STICK_ADDR 0x1fe0000f070UL
291
292 static unsigned long __hbird_read_stick(void)
293 {
294 unsigned long ret, tmp1, tmp2, tmp3;
295 unsigned long addr = HBIRD_STICK_ADDR+8;
296
297 __asm__ __volatile__("ldxa [%1] %5, %2\n"
298 "1:\n\t"
299 "sub %1, 0x8, %1\n\t"
300 "ldxa [%1] %5, %3\n\t"
301 "add %1, 0x8, %1\n\t"
302 "ldxa [%1] %5, %4\n\t"
303 "cmp %4, %2\n\t"
304 "bne,a,pn %%xcc, 1b\n\t"
305 " mov %4, %2\n\t"
306 "sllx %4, 32, %4\n\t"
307 "or %3, %4, %0\n\t"
308 : "=&r" (ret), "=&r" (addr),
309 "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
310 : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
311
312 return ret;
313 }
314
315 static void __hbird_write_stick(unsigned long val)
316 {
317 unsigned long low = (val & 0xffffffffUL);
318 unsigned long high = (val >> 32UL);
319 unsigned long addr = HBIRD_STICK_ADDR;
320
321 __asm__ __volatile__("stxa %%g0, [%0] %4\n\t"
322 "add %0, 0x8, %0\n\t"
323 "stxa %3, [%0] %4\n\t"
324 "sub %0, 0x8, %0\n\t"
325 "stxa %2, [%0] %4"
326 : "=&r" (addr)
327 : "0" (addr), "r" (low), "r" (high),
328 "i" (ASI_PHYS_BYPASS_EC_E));
329 }
330
331 static void __hbird_write_compare(unsigned long val)
332 {
333 unsigned long low = (val & 0xffffffffUL);
334 unsigned long high = (val >> 32UL);
335 unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
336
337 __asm__ __volatile__("stxa %3, [%0] %4\n\t"
338 "sub %0, 0x8, %0\n\t"
339 "stxa %2, [%0] %4"
340 : "=&r" (addr)
341 : "0" (addr), "r" (low), "r" (high),
342 "i" (ASI_PHYS_BYPASS_EC_E));
343 }
344
345 static void hbtick_disable_irq(void)
346 {
347 __hbird_write_compare(TICKCMP_IRQ_BIT);
348 }
349
350 static void hbtick_init_tick(void)
351 {
352 tick_disable_protection();
353
354 /* XXX This seems to be necessary to 'jumpstart' Hummingbird
355 * XXX into actually sending STICK interrupts. I think because
356 * XXX of how we store %tick_cmpr in head.S this somehow resets the
357 * XXX {TICK + STICK} interrupt mux. -DaveM
358 */
359 __hbird_write_stick(__hbird_read_stick());
360
361 hbtick_disable_irq();
362 }
363
364 static unsigned long hbtick_get_tick(void)
365 {
366 return __hbird_read_stick() & ~TICK_PRIV_BIT;
367 }
368
369 static unsigned long hbtick_add_tick(unsigned long adj)
370 {
371 unsigned long val;
372
373 val = __hbird_read_stick() + adj;
374 __hbird_write_stick(val);
375
376 return val;
377 }
378
379 static int hbtick_add_compare(unsigned long adj)
380 {
381 unsigned long val = __hbird_read_stick();
382 unsigned long val2;
383
384 val &= ~TICKCMP_IRQ_BIT;
385 val += adj;
386 __hbird_write_compare(val);
387
388 val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
389
390 return ((long)(val2 - val)) > 0L;
391 }
392
393 static struct sparc64_tick_ops hbtick_operations __read_mostly = {
394 .name = "hbtick",
395 .init_tick = hbtick_init_tick,
396 .disable_irq = hbtick_disable_irq,
397 .get_tick = hbtick_get_tick,
398 .add_tick = hbtick_add_tick,
399 .add_compare = hbtick_add_compare,
400 .softint_mask = 1UL << 0,
401 };
402
403 static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
404
405 int update_persistent_clock(struct timespec now)
406 {
407 return set_rtc_mmss(now.tv_sec);
408 }
409
410 /* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
411 static void __init kick_start_clock(void)
412 {
413 void __iomem *regs = mstk48t02_regs;
414 u8 sec, tmp;
415 int i, count;
416
417 prom_printf("CLOCK: Clock was stopped. Kick start ");
418
419 spin_lock_irq(&mostek_lock);
420
421 /* Turn on the kick start bit to start the oscillator. */
422 tmp = mostek_read(regs + MOSTEK_CREG);
423 tmp |= MSTK_CREG_WRITE;
424 mostek_write(regs + MOSTEK_CREG, tmp);
425 tmp = mostek_read(regs + MOSTEK_SEC);
426 tmp &= ~MSTK_STOP;
427 mostek_write(regs + MOSTEK_SEC, tmp);
428 tmp = mostek_read(regs + MOSTEK_HOUR);
429 tmp |= MSTK_KICK_START;
430 mostek_write(regs + MOSTEK_HOUR, tmp);
431 tmp = mostek_read(regs + MOSTEK_CREG);
432 tmp &= ~MSTK_CREG_WRITE;
433 mostek_write(regs + MOSTEK_CREG, tmp);
434
435 spin_unlock_irq(&mostek_lock);
436
437 /* Delay to allow the clock oscillator to start. */
438 sec = MSTK_REG_SEC(regs);
439 for (i = 0; i < 3; i++) {
440 while (sec == MSTK_REG_SEC(regs))
441 for (count = 0; count < 100000; count++)
442 /* nothing */ ;
443 prom_printf(".");
444 sec = MSTK_REG_SEC(regs);
445 }
446 prom_printf("\n");
447
448 spin_lock_irq(&mostek_lock);
449
450 /* Turn off kick start and set a "valid" time and date. */
451 tmp = mostek_read(regs + MOSTEK_CREG);
452 tmp |= MSTK_CREG_WRITE;
453 mostek_write(regs + MOSTEK_CREG, tmp);
454 tmp = mostek_read(regs + MOSTEK_HOUR);
455 tmp &= ~MSTK_KICK_START;
456 mostek_write(regs + MOSTEK_HOUR, tmp);
457 MSTK_SET_REG_SEC(regs,0);
458 MSTK_SET_REG_MIN(regs,0);
459 MSTK_SET_REG_HOUR(regs,0);
460 MSTK_SET_REG_DOW(regs,5);
461 MSTK_SET_REG_DOM(regs,1);
462 MSTK_SET_REG_MONTH(regs,8);
463 MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
464 tmp = mostek_read(regs + MOSTEK_CREG);
465 tmp &= ~MSTK_CREG_WRITE;
466 mostek_write(regs + MOSTEK_CREG, tmp);
467
468 spin_unlock_irq(&mostek_lock);
469
470 /* Ensure the kick start bit is off. If it isn't, turn it off. */
471 while (mostek_read(regs + MOSTEK_HOUR) & MSTK_KICK_START) {
472 prom_printf("CLOCK: Kick start still on!\n");
473
474 spin_lock_irq(&mostek_lock);
475
476 tmp = mostek_read(regs + MOSTEK_CREG);
477 tmp |= MSTK_CREG_WRITE;
478 mostek_write(regs + MOSTEK_CREG, tmp);
479
480 tmp = mostek_read(regs + MOSTEK_HOUR);
481 tmp &= ~MSTK_KICK_START;
482 mostek_write(regs + MOSTEK_HOUR, tmp);
483
484 tmp = mostek_read(regs + MOSTEK_CREG);
485 tmp &= ~MSTK_CREG_WRITE;
486 mostek_write(regs + MOSTEK_CREG, tmp);
487
488 spin_unlock_irq(&mostek_lock);
489 }
490
491 prom_printf("CLOCK: Kick start procedure successful.\n");
492 }
493
494 /* Return nonzero if the clock chip battery is low. */
495 static int __init has_low_battery(void)
496 {
497 void __iomem *regs = mstk48t02_regs;
498 u8 data1, data2;
499
500 spin_lock_irq(&mostek_lock);
501
502 data1 = mostek_read(regs + MOSTEK_EEPROM); /* Read some data. */
503 mostek_write(regs + MOSTEK_EEPROM, ~data1); /* Write back the complement. */
504 data2 = mostek_read(regs + MOSTEK_EEPROM); /* Read back the complement. */
505 mostek_write(regs + MOSTEK_EEPROM, data1); /* Restore original value. */
506
507 spin_unlock_irq(&mostek_lock);
508
509 return (data1 == data2); /* Was the write blocked? */
510 }
511
512 static void __init mostek_set_system_time(void __iomem *mregs)
513 {
514 unsigned int year, mon, day, hour, min, sec;
515 u8 tmp;
516
517 spin_lock_irq(&mostek_lock);
518
519 /* Traditional Mostek chip. */
520 tmp = mostek_read(mregs + MOSTEK_CREG);
521 tmp |= MSTK_CREG_READ;
522 mostek_write(mregs + MOSTEK_CREG, tmp);
523
524 sec = MSTK_REG_SEC(mregs);
525 min = MSTK_REG_MIN(mregs);
526 hour = MSTK_REG_HOUR(mregs);
527 day = MSTK_REG_DOM(mregs);
528 mon = MSTK_REG_MONTH(mregs);
529 year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
530
531 xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
532 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
533 set_normalized_timespec(&wall_to_monotonic,
534 -xtime.tv_sec, -xtime.tv_nsec);
535
536 tmp = mostek_read(mregs + MOSTEK_CREG);
537 tmp &= ~MSTK_CREG_READ;
538 mostek_write(mregs + MOSTEK_CREG, tmp);
539
540 spin_unlock_irq(&mostek_lock);
541 }
542
543 /* Probe for the real time clock chip. */
544 static void __init set_system_time(void)
545 {
546 unsigned int year, mon, day, hour, min, sec;
547 void __iomem *mregs = mstk48t02_regs;
548 #ifdef CONFIG_PCI
549 unsigned long dregs = ds1287_regs;
550 void __iomem *bregs = bq4802_regs;
551 #else
552 unsigned long dregs = 0UL;
553 void __iomem *bregs = 0UL;
554 #endif
555
556 if (!mregs && !dregs && !bregs) {
557 prom_printf("Something wrong, clock regs not mapped yet.\n");
558 prom_halt();
559 }
560
561 if (mregs) {
562 mostek_set_system_time(mregs);
563 return;
564 }
565
566 if (bregs) {
567 unsigned char val = readb(bregs + 0x0e);
568 unsigned int century;
569
570 /* BQ4802 RTC chip. */
571
572 writeb(val | 0x08, bregs + 0x0e);
573
574 sec = readb(bregs + 0x00);
575 min = readb(bregs + 0x02);
576 hour = readb(bregs + 0x04);
577 day = readb(bregs + 0x06);
578 mon = readb(bregs + 0x09);
579 year = readb(bregs + 0x0a);
580 century = readb(bregs + 0x0f);
581
582 writeb(val, bregs + 0x0e);
583
584 BCD_TO_BIN(sec);
585 BCD_TO_BIN(min);
586 BCD_TO_BIN(hour);
587 BCD_TO_BIN(day);
588 BCD_TO_BIN(mon);
589 BCD_TO_BIN(year);
590 BCD_TO_BIN(century);
591
592 year += (century * 100);
593 } else {
594 /* Dallas 12887 RTC chip. */
595
596 do {
597 sec = CMOS_READ(RTC_SECONDS);
598 min = CMOS_READ(RTC_MINUTES);
599 hour = CMOS_READ(RTC_HOURS);
600 day = CMOS_READ(RTC_DAY_OF_MONTH);
601 mon = CMOS_READ(RTC_MONTH);
602 year = CMOS_READ(RTC_YEAR);
603 } while (sec != CMOS_READ(RTC_SECONDS));
604
605 if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
606 BCD_TO_BIN(sec);
607 BCD_TO_BIN(min);
608 BCD_TO_BIN(hour);
609 BCD_TO_BIN(day);
610 BCD_TO_BIN(mon);
611 BCD_TO_BIN(year);
612 }
613 if ((year += 1900) < 1970)
614 year += 100;
615 }
616
617 xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
618 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
619 set_normalized_timespec(&wall_to_monotonic,
620 -xtime.tv_sec, -xtime.tv_nsec);
621 }
622
623 /* davem suggests we keep this within the 4M locked kernel image */
624 static u32 starfire_get_time(void)
625 {
626 static char obp_gettod[32];
627 static u32 unix_tod;
628
629 sprintf(obp_gettod, "h# %08x unix-gettod",
630 (unsigned int) (long) &unix_tod);
631 prom_feval(obp_gettod);
632
633 return unix_tod;
634 }
635
636 static int starfire_set_time(u32 val)
637 {
638 /* Do nothing, time is set using the service processor
639 * console on this platform.
640 */
641 return 0;
642 }
643
644 static u32 hypervisor_get_time(void)
645 {
646 unsigned long ret, time;
647 int retries = 10000;
648
649 retry:
650 ret = sun4v_tod_get(&time);
651 if (ret == HV_EOK)
652 return time;
653 if (ret == HV_EWOULDBLOCK) {
654 if (--retries > 0) {
655 udelay(100);
656 goto retry;
657 }
658 printk(KERN_WARNING "SUN4V: tod_get() timed out.\n");
659 return 0;
660 }
661 printk(KERN_WARNING "SUN4V: tod_get() not supported.\n");
662 return 0;
663 }
664
665 static int hypervisor_set_time(u32 secs)
666 {
667 unsigned long ret;
668 int retries = 10000;
669
670 retry:
671 ret = sun4v_tod_set(secs);
672 if (ret == HV_EOK)
673 return 0;
674 if (ret == HV_EWOULDBLOCK) {
675 if (--retries > 0) {
676 udelay(100);
677 goto retry;
678 }
679 printk(KERN_WARNING "SUN4V: tod_set() timed out.\n");
680 return -EAGAIN;
681 }
682 printk(KERN_WARNING "SUN4V: tod_set() not supported.\n");
683 return -EOPNOTSUPP;
684 }
685
686 static int __init clock_model_matches(const char *model)
687 {
688 if (strcmp(model, "mk48t02") &&
689 strcmp(model, "mk48t08") &&
690 strcmp(model, "mk48t59") &&
691 strcmp(model, "m5819") &&
692 strcmp(model, "m5819p") &&
693 strcmp(model, "m5823") &&
694 strcmp(model, "ds1287") &&
695 strcmp(model, "bq4802"))
696 return 0;
697
698 return 1;
699 }
700
701 static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match)
702 {
703 struct device_node *dp = op->node;
704 const char *model = of_get_property(dp, "model", NULL);
705 const char *compat = of_get_property(dp, "compatible", NULL);
706 unsigned long size, flags;
707 void __iomem *regs;
708
709 if (!model)
710 model = compat;
711
712 if (!model || !clock_model_matches(model))
713 return -ENODEV;
714
715 /* On an Enterprise system there can be multiple mostek clocks.
716 * We should only match the one that is on the central FHC bus.
717 */
718 if (!strcmp(dp->parent->name, "fhc") &&
719 strcmp(dp->parent->parent->name, "central") != 0)
720 return -ENODEV;
721
722 size = (op->resource[0].end - op->resource[0].start) + 1;
723 regs = of_ioremap(&op->resource[0], 0, size, "clock");
724 if (!regs)
725 return -ENOMEM;
726
727 #ifdef CONFIG_PCI
728 if (!strcmp(model, "ds1287") ||
729 !strcmp(model, "m5819") ||
730 !strcmp(model, "m5819p") ||
731 !strcmp(model, "m5823")) {
732 ds1287_regs = (unsigned long) regs;
733 } else if (!strcmp(model, "bq4802")) {
734 bq4802_regs = regs;
735 } else
736 #endif
737 if (model[5] == '0' && model[6] == '2') {
738 mstk48t02_regs = regs;
739 } else if(model[5] == '0' && model[6] == '8') {
740 mstk48t08_regs = regs;
741 mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02;
742 } else {
743 mstk48t59_regs = regs;
744 mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
745 }
746
747 printk(KERN_INFO "%s: Clock regs at %p\n", dp->full_name, regs);
748
749 local_irq_save(flags);
750
751 if (mstk48t02_regs != NULL) {
752 /* Report a low battery voltage condition. */
753 if (has_low_battery())
754 prom_printf("NVRAM: Low battery voltage!\n");
755
756 /* Kick start the clock if it is completely stopped. */
757 if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
758 kick_start_clock();
759 }
760
761 set_system_time();
762
763 local_irq_restore(flags);
764
765 return 0;
766 }
767
768 static struct of_device_id clock_match[] = {
769 {
770 .name = "eeprom",
771 },
772 {
773 .name = "rtc",
774 },
775 {},
776 };
777
778 static struct of_platform_driver clock_driver = {
779 .match_table = clock_match,
780 .probe = clock_probe,
781 .driver = {
782 .name = "clock",
783 },
784 };
785
786 static int __init clock_init(void)
787 {
788 if (this_is_starfire) {
789 xtime.tv_sec = starfire_get_time();
790 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
791 set_normalized_timespec(&wall_to_monotonic,
792 -xtime.tv_sec, -xtime.tv_nsec);
793 return 0;
794 }
795 if (tlb_type == hypervisor) {
796 xtime.tv_sec = hypervisor_get_time();
797 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
798 set_normalized_timespec(&wall_to_monotonic,
799 -xtime.tv_sec, -xtime.tv_nsec);
800 return 0;
801 }
802
803 return of_register_driver(&clock_driver, &of_platform_bus_type);
804 }
805
806 /* Must be after subsys_initcall() so that busses are probed. Must
807 * be before device_initcall() because things like the RTC driver
808 * need to see the clock registers.
809 */
810 fs_initcall(clock_init);
811
812 /* This is gets the master TICK_INT timer going. */
813 static unsigned long sparc64_init_timers(void)
814 {
815 struct device_node *dp;
816 unsigned long clock;
817
818 dp = of_find_node_by_path("/");
819 if (tlb_type == spitfire) {
820 unsigned long ver, manuf, impl;
821
822 __asm__ __volatile__ ("rdpr %%ver, %0"
823 : "=&r" (ver));
824 manuf = ((ver >> 48) & 0xffff);
825 impl = ((ver >> 32) & 0xffff);
826 if (manuf == 0x17 && impl == 0x13) {
827 /* Hummingbird, aka Ultra-IIe */
828 tick_ops = &hbtick_operations;
829 clock = of_getintprop_default(dp, "stick-frequency", 0);
830 } else {
831 tick_ops = &tick_operations;
832 clock = local_cpu_data().clock_tick;
833 }
834 } else {
835 tick_ops = &stick_operations;
836 clock = of_getintprop_default(dp, "stick-frequency", 0);
837 }
838
839 return clock;
840 }
841
842 struct freq_table {
843 unsigned long clock_tick_ref;
844 unsigned int ref_freq;
845 };
846 static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
847
848 unsigned long sparc64_get_clock_tick(unsigned int cpu)
849 {
850 struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
851
852 if (ft->clock_tick_ref)
853 return ft->clock_tick_ref;
854 return cpu_data(cpu).clock_tick;
855 }
856
857 #ifdef CONFIG_CPU_FREQ
858
859 static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
860 void *data)
861 {
862 struct cpufreq_freqs *freq = data;
863 unsigned int cpu = freq->cpu;
864 struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
865
866 if (!ft->ref_freq) {
867 ft->ref_freq = freq->old;
868 ft->clock_tick_ref = cpu_data(cpu).clock_tick;
869 }
870 if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) ||
871 (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
872 (val == CPUFREQ_RESUMECHANGE)) {
873 cpu_data(cpu).clock_tick =
874 cpufreq_scale(ft->clock_tick_ref,
875 ft->ref_freq,
876 freq->new);
877 }
878
879 return 0;
880 }
881
882 static struct notifier_block sparc64_cpufreq_notifier_block = {
883 .notifier_call = sparc64_cpufreq_notifier
884 };
885
886 #endif /* CONFIG_CPU_FREQ */
887
888 static int sparc64_next_event(unsigned long delta,
889 struct clock_event_device *evt)
890 {
891 return tick_ops->add_compare(delta) ? -ETIME : 0;
892 }
893
894 static void sparc64_timer_setup(enum clock_event_mode mode,
895 struct clock_event_device *evt)
896 {
897 switch (mode) {
898 case CLOCK_EVT_MODE_ONESHOT:
899 case CLOCK_EVT_MODE_RESUME:
900 break;
901
902 case CLOCK_EVT_MODE_SHUTDOWN:
903 tick_ops->disable_irq();
904 break;
905
906 case CLOCK_EVT_MODE_PERIODIC:
907 case CLOCK_EVT_MODE_UNUSED:
908 WARN_ON(1);
909 break;
910 };
911 }
912
913 static struct clock_event_device sparc64_clockevent = {
914 .features = CLOCK_EVT_FEAT_ONESHOT,
915 .set_mode = sparc64_timer_setup,
916 .set_next_event = sparc64_next_event,
917 .rating = 100,
918 .shift = 30,
919 .irq = -1,
920 };
921 static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
922
923 void timer_interrupt(int irq, struct pt_regs *regs)
924 {
925 struct pt_regs *old_regs = set_irq_regs(regs);
926 unsigned long tick_mask = tick_ops->softint_mask;
927 int cpu = smp_processor_id();
928 struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
929
930 clear_softint(tick_mask);
931
932 irq_enter();
933
934 kstat_this_cpu.irqs[0]++;
935
936 if (unlikely(!evt->event_handler)) {
937 printk(KERN_WARNING
938 "Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
939 } else
940 evt->event_handler(evt);
941
942 irq_exit();
943
944 set_irq_regs(old_regs);
945 }
946
947 void __devinit setup_sparc64_timer(void)
948 {
949 struct clock_event_device *sevt;
950 unsigned long pstate;
951
952 /* Guarantee that the following sequences execute
953 * uninterrupted.
954 */
955 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
956 "wrpr %0, %1, %%pstate"
957 : "=r" (pstate)
958 : "i" (PSTATE_IE));
959
960 tick_ops->init_tick();
961
962 /* Restore PSTATE_IE. */
963 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
964 : /* no outputs */
965 : "r" (pstate));
966
967 sevt = &__get_cpu_var(sparc64_events);
968
969 memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
970 sevt->cpumask = cpumask_of_cpu(smp_processor_id());
971
972 clockevents_register_device(sevt);
973 }
974
975 #define SPARC64_NSEC_PER_CYC_SHIFT 10UL
976
977 static struct clocksource clocksource_tick = {
978 .rating = 100,
979 .mask = CLOCKSOURCE_MASK(64),
980 .shift = 16,
981 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
982 };
983
984 static void __init setup_clockevent_multiplier(unsigned long hz)
985 {
986 unsigned long mult, shift = 32;
987
988 while (1) {
989 mult = div_sc(hz, NSEC_PER_SEC, shift);
990 if (mult && (mult >> 32UL) == 0UL)
991 break;
992
993 shift--;
994 }
995
996 sparc64_clockevent.shift = shift;
997 sparc64_clockevent.mult = mult;
998 }
999
1000 static unsigned long tb_ticks_per_usec __read_mostly;
1001
1002 void __delay(unsigned long loops)
1003 {
1004 unsigned long bclock, now;
1005
1006 bclock = tick_ops->get_tick();
1007 do {
1008 now = tick_ops->get_tick();
1009 } while ((now-bclock) < loops);
1010 }
1011 EXPORT_SYMBOL(__delay);
1012
1013 void udelay(unsigned long usecs)
1014 {
1015 __delay(tb_ticks_per_usec * usecs);
1016 }
1017 EXPORT_SYMBOL(udelay);
1018
1019 void __init time_init(void)
1020 {
1021 unsigned long clock = sparc64_init_timers();
1022
1023 tb_ticks_per_usec = clock / USEC_PER_SEC;
1024
1025 timer_ticks_per_nsec_quotient =
1026 clocksource_hz2mult(clock, SPARC64_NSEC_PER_CYC_SHIFT);
1027
1028 clocksource_tick.name = tick_ops->name;
1029 clocksource_tick.mult =
1030 clocksource_hz2mult(clock,
1031 clocksource_tick.shift);
1032 clocksource_tick.read = tick_ops->get_tick;
1033
1034 printk("clocksource: mult[%x] shift[%d]\n",
1035 clocksource_tick.mult, clocksource_tick.shift);
1036
1037 clocksource_register(&clocksource_tick);
1038
1039 sparc64_clockevent.name = tick_ops->name;
1040
1041 setup_clockevent_multiplier(clock);
1042
1043 sparc64_clockevent.max_delta_ns =
1044 clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent);
1045 sparc64_clockevent.min_delta_ns =
1046 clockevent_delta2ns(0xF, &sparc64_clockevent);
1047
1048 printk("clockevent: mult[%lx] shift[%d]\n",
1049 sparc64_clockevent.mult, sparc64_clockevent.shift);
1050
1051 setup_sparc64_timer();
1052
1053 #ifdef CONFIG_CPU_FREQ
1054 cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
1055 CPUFREQ_TRANSITION_NOTIFIER);
1056 #endif
1057 }
1058
1059 unsigned long long sched_clock(void)
1060 {
1061 unsigned long ticks = tick_ops->get_tick();
1062
1063 return (ticks * timer_ticks_per_nsec_quotient)
1064 >> SPARC64_NSEC_PER_CYC_SHIFT;
1065 }
1066
1067 static int set_rtc_mmss(unsigned long nowtime)
1068 {
1069 int real_seconds, real_minutes, chip_minutes;
1070 void __iomem *mregs = mstk48t02_regs;
1071 #ifdef CONFIG_PCI
1072 unsigned long dregs = ds1287_regs;
1073 void __iomem *bregs = bq4802_regs;
1074 #else
1075 unsigned long dregs = 0UL;
1076 void __iomem *bregs = 0UL;
1077 #endif
1078 unsigned long flags;
1079 u8 tmp;
1080
1081 /*
1082 * Not having a register set can lead to trouble.
1083 * Also starfire doesn't have a tod clock.
1084 */
1085 if (!mregs && !dregs && !bregs)
1086 return -1;
1087
1088 if (mregs) {
1089 spin_lock_irqsave(&mostek_lock, flags);
1090
1091 /* Read the current RTC minutes. */
1092 tmp = mostek_read(mregs + MOSTEK_CREG);
1093 tmp |= MSTK_CREG_READ;
1094 mostek_write(mregs + MOSTEK_CREG, tmp);
1095
1096 chip_minutes = MSTK_REG_MIN(mregs);
1097
1098 tmp = mostek_read(mregs + MOSTEK_CREG);
1099 tmp &= ~MSTK_CREG_READ;
1100 mostek_write(mregs + MOSTEK_CREG, tmp);
1101
1102 /*
1103 * since we're only adjusting minutes and seconds,
1104 * don't interfere with hour overflow. This avoids
1105 * messing with unknown time zones but requires your
1106 * RTC not to be off by more than 15 minutes
1107 */
1108 real_seconds = nowtime % 60;
1109 real_minutes = nowtime / 60;
1110 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1111 real_minutes += 30; /* correct for half hour time zone */
1112 real_minutes %= 60;
1113
1114 if (abs(real_minutes - chip_minutes) < 30) {
1115 tmp = mostek_read(mregs + MOSTEK_CREG);
1116 tmp |= MSTK_CREG_WRITE;
1117 mostek_write(mregs + MOSTEK_CREG, tmp);
1118
1119 MSTK_SET_REG_SEC(mregs,real_seconds);
1120 MSTK_SET_REG_MIN(mregs,real_minutes);
1121
1122 tmp = mostek_read(mregs + MOSTEK_CREG);
1123 tmp &= ~MSTK_CREG_WRITE;
1124 mostek_write(mregs + MOSTEK_CREG, tmp);
1125
1126 spin_unlock_irqrestore(&mostek_lock, flags);
1127
1128 return 0;
1129 } else {
1130 spin_unlock_irqrestore(&mostek_lock, flags);
1131
1132 return -1;
1133 }
1134 } else if (bregs) {
1135 int retval = 0;
1136 unsigned char val = readb(bregs + 0x0e);
1137
1138 /* BQ4802 RTC chip. */
1139
1140 writeb(val | 0x08, bregs + 0x0e);
1141
1142 chip_minutes = readb(bregs + 0x02);
1143 BCD_TO_BIN(chip_minutes);
1144 real_seconds = nowtime % 60;
1145 real_minutes = nowtime / 60;
1146 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1147 real_minutes += 30;
1148 real_minutes %= 60;
1149
1150 if (abs(real_minutes - chip_minutes) < 30) {
1151 BIN_TO_BCD(real_seconds);
1152 BIN_TO_BCD(real_minutes);
1153 writeb(real_seconds, bregs + 0x00);
1154 writeb(real_minutes, bregs + 0x02);
1155 } else {
1156 printk(KERN_WARNING
1157 "set_rtc_mmss: can't update from %d to %d\n",
1158 chip_minutes, real_minutes);
1159 retval = -1;
1160 }
1161
1162 writeb(val, bregs + 0x0e);
1163
1164 return retval;
1165 } else {
1166 int retval = 0;
1167 unsigned char save_control, save_freq_select;
1168
1169 /* Stolen from arch/i386/kernel/time.c, see there for
1170 * credits and descriptive comments.
1171 */
1172 spin_lock_irqsave(&rtc_lock, flags);
1173 save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
1174 CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
1175
1176 save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
1177 CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
1178
1179 chip_minutes = CMOS_READ(RTC_MINUTES);
1180 if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
1181 BCD_TO_BIN(chip_minutes);
1182 real_seconds = nowtime % 60;
1183 real_minutes = nowtime / 60;
1184 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1185 real_minutes += 30;
1186 real_minutes %= 60;
1187
1188 if (abs(real_minutes - chip_minutes) < 30) {
1189 if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1190 BIN_TO_BCD(real_seconds);
1191 BIN_TO_BCD(real_minutes);
1192 }
1193 CMOS_WRITE(real_seconds,RTC_SECONDS);
1194 CMOS_WRITE(real_minutes,RTC_MINUTES);
1195 } else {
1196 printk(KERN_WARNING
1197 "set_rtc_mmss: can't update from %d to %d\n",
1198 chip_minutes, real_minutes);
1199 retval = -1;
1200 }
1201
1202 CMOS_WRITE(save_control, RTC_CONTROL);
1203 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1204 spin_unlock_irqrestore(&rtc_lock, flags);
1205
1206 return retval;
1207 }
1208 }
1209
1210 #define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
1211 static unsigned char mini_rtc_status; /* bitmapped status byte. */
1212
1213 #define FEBRUARY 2
1214 #define STARTOFTIME 1970
1215 #define SECDAY 86400L
1216 #define SECYR (SECDAY * 365)
1217 #define leapyear(year) ((year) % 4 == 0 && \
1218 ((year) % 100 != 0 || (year) % 400 == 0))
1219 #define days_in_year(a) (leapyear(a) ? 366 : 365)
1220 #define days_in_month(a) (month_days[(a) - 1])
1221
1222 static int month_days[12] = {
1223 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
1224 };
1225
1226 /*
1227 * This only works for the Gregorian calendar - i.e. after 1752 (in the UK)
1228 */
1229 static void GregorianDay(struct rtc_time * tm)
1230 {
1231 int leapsToDate;
1232 int lastYear;
1233 int day;
1234 int MonthOffset[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
1235
1236 lastYear = tm->tm_year - 1;
1237
1238 /*
1239 * Number of leap corrections to apply up to end of last year
1240 */
1241 leapsToDate = lastYear / 4 - lastYear / 100 + lastYear / 400;
1242
1243 /*
1244 * This year is a leap year if it is divisible by 4 except when it is
1245 * divisible by 100 unless it is divisible by 400
1246 *
1247 * e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 was
1248 */
1249 day = tm->tm_mon > 2 && leapyear(tm->tm_year);
1250
1251 day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] +
1252 tm->tm_mday;
1253
1254 tm->tm_wday = day % 7;
1255 }
1256
1257 static void to_tm(int tim, struct rtc_time *tm)
1258 {
1259 register int i;
1260 register long hms, day;
1261
1262 day = tim / SECDAY;
1263 hms = tim % SECDAY;
1264
1265 /* Hours, minutes, seconds are easy */
1266 tm->tm_hour = hms / 3600;
1267 tm->tm_min = (hms % 3600) / 60;
1268 tm->tm_sec = (hms % 3600) % 60;
1269
1270 /* Number of years in days */
1271 for (i = STARTOFTIME; day >= days_in_year(i); i++)
1272 day -= days_in_year(i);
1273 tm->tm_year = i;
1274
1275 /* Number of months in days left */
1276 if (leapyear(tm->tm_year))
1277 days_in_month(FEBRUARY) = 29;
1278 for (i = 1; day >= days_in_month(i); i++)
1279 day -= days_in_month(i);
1280 days_in_month(FEBRUARY) = 28;
1281 tm->tm_mon = i;
1282
1283 /* Days are what is left over (+1) from all that. */
1284 tm->tm_mday = day + 1;
1285
1286 /*
1287 * Determine the day of week
1288 */
1289 GregorianDay(tm);
1290 }
1291
1292 /* Both Starfire and SUN4V give us seconds since Jan 1st, 1970,
1293 * aka Unix time. So we have to convert to/from rtc_time.
1294 */
1295 static void starfire_get_rtc_time(struct rtc_time *time)
1296 {
1297 u32 seconds = starfire_get_time();
1298
1299 to_tm(seconds, time);
1300 time->tm_year -= 1900;
1301 time->tm_mon -= 1;
1302 }
1303
1304 static int starfire_set_rtc_time(struct rtc_time *time)
1305 {
1306 u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
1307 time->tm_mday, time->tm_hour,
1308 time->tm_min, time->tm_sec);
1309
1310 return starfire_set_time(seconds);
1311 }
1312
1313 static void hypervisor_get_rtc_time(struct rtc_time *time)
1314 {
1315 u32 seconds = hypervisor_get_time();
1316
1317 to_tm(seconds, time);
1318 time->tm_year -= 1900;
1319 time->tm_mon -= 1;
1320 }
1321
1322 static int hypervisor_set_rtc_time(struct rtc_time *time)
1323 {
1324 u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
1325 time->tm_mday, time->tm_hour,
1326 time->tm_min, time->tm_sec);
1327
1328 return hypervisor_set_time(seconds);
1329 }
1330
1331 #ifdef CONFIG_PCI
1332 static void bq4802_get_rtc_time(struct rtc_time *time)
1333 {
1334 unsigned char val = readb(bq4802_regs + 0x0e);
1335 unsigned int century;
1336
1337 writeb(val | 0x08, bq4802_regs + 0x0e);
1338
1339 time->tm_sec = readb(bq4802_regs + 0x00);
1340 time->tm_min = readb(bq4802_regs + 0x02);
1341 time->tm_hour = readb(bq4802_regs + 0x04);
1342 time->tm_mday = readb(bq4802_regs + 0x06);
1343 time->tm_mon = readb(bq4802_regs + 0x09);
1344 time->tm_year = readb(bq4802_regs + 0x0a);
1345 time->tm_wday = readb(bq4802_regs + 0x08);
1346 century = readb(bq4802_regs + 0x0f);
1347
1348 writeb(val, bq4802_regs + 0x0e);
1349
1350 BCD_TO_BIN(time->tm_sec);
1351 BCD_TO_BIN(time->tm_min);
1352 BCD_TO_BIN(time->tm_hour);
1353 BCD_TO_BIN(time->tm_mday);
1354 BCD_TO_BIN(time->tm_mon);
1355 BCD_TO_BIN(time->tm_year);
1356 BCD_TO_BIN(time->tm_wday);
1357 BCD_TO_BIN(century);
1358
1359 time->tm_year += (century * 100);
1360 time->tm_year -= 1900;
1361
1362 time->tm_mon--;
1363 }
1364
1365 static int bq4802_set_rtc_time(struct rtc_time *time)
1366 {
1367 unsigned char val = readb(bq4802_regs + 0x0e);
1368 unsigned char sec, min, hrs, day, mon, yrs, century;
1369 unsigned int year;
1370
1371 year = time->tm_year + 1900;
1372 century = year / 100;
1373 yrs = year % 100;
1374
1375 mon = time->tm_mon + 1; /* tm_mon starts at zero */
1376 day = time->tm_mday;
1377 hrs = time->tm_hour;
1378 min = time->tm_min;
1379 sec = time->tm_sec;
1380
1381 BIN_TO_BCD(sec);
1382 BIN_TO_BCD(min);
1383 BIN_TO_BCD(hrs);
1384 BIN_TO_BCD(day);
1385 BIN_TO_BCD(mon);
1386 BIN_TO_BCD(yrs);
1387 BIN_TO_BCD(century);
1388
1389 writeb(val | 0x08, bq4802_regs + 0x0e);
1390
1391 writeb(sec, bq4802_regs + 0x00);
1392 writeb(min, bq4802_regs + 0x02);
1393 writeb(hrs, bq4802_regs + 0x04);
1394 writeb(day, bq4802_regs + 0x06);
1395 writeb(mon, bq4802_regs + 0x09);
1396 writeb(yrs, bq4802_regs + 0x0a);
1397 writeb(century, bq4802_regs + 0x0f);
1398
1399 writeb(val, bq4802_regs + 0x0e);
1400
1401 return 0;
1402 }
1403
1404 static void cmos_get_rtc_time(struct rtc_time *rtc_tm)
1405 {
1406 unsigned char ctrl;
1407
1408 rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS);
1409 rtc_tm->tm_min = CMOS_READ(RTC_MINUTES);
1410 rtc_tm->tm_hour = CMOS_READ(RTC_HOURS);
1411 rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH);
1412 rtc_tm->tm_mon = CMOS_READ(RTC_MONTH);
1413 rtc_tm->tm_year = CMOS_READ(RTC_YEAR);
1414 rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK);
1415
1416 ctrl = CMOS_READ(RTC_CONTROL);
1417 if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1418 BCD_TO_BIN(rtc_tm->tm_sec);
1419 BCD_TO_BIN(rtc_tm->tm_min);
1420 BCD_TO_BIN(rtc_tm->tm_hour);
1421 BCD_TO_BIN(rtc_tm->tm_mday);
1422 BCD_TO_BIN(rtc_tm->tm_mon);
1423 BCD_TO_BIN(rtc_tm->tm_year);
1424 BCD_TO_BIN(rtc_tm->tm_wday);
1425 }
1426
1427 if (rtc_tm->tm_year <= 69)
1428 rtc_tm->tm_year += 100;
1429
1430 rtc_tm->tm_mon--;
1431 }
1432
1433 static int cmos_set_rtc_time(struct rtc_time *rtc_tm)
1434 {
1435 unsigned char mon, day, hrs, min, sec;
1436 unsigned char save_control, save_freq_select;
1437 unsigned int yrs;
1438
1439 yrs = rtc_tm->tm_year;
1440 mon = rtc_tm->tm_mon + 1;
1441 day = rtc_tm->tm_mday;
1442 hrs = rtc_tm->tm_hour;
1443 min = rtc_tm->tm_min;
1444 sec = rtc_tm->tm_sec;
1445
1446 if (yrs >= 100)
1447 yrs -= 100;
1448
1449 if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1450 BIN_TO_BCD(sec);
1451 BIN_TO_BCD(min);
1452 BIN_TO_BCD(hrs);
1453 BIN_TO_BCD(day);
1454 BIN_TO_BCD(mon);
1455 BIN_TO_BCD(yrs);
1456 }
1457
1458 save_control = CMOS_READ(RTC_CONTROL);
1459 CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
1460 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1461 CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
1462
1463 CMOS_WRITE(yrs, RTC_YEAR);
1464 CMOS_WRITE(mon, RTC_MONTH);
1465 CMOS_WRITE(day, RTC_DAY_OF_MONTH);
1466 CMOS_WRITE(hrs, RTC_HOURS);
1467 CMOS_WRITE(min, RTC_MINUTES);
1468 CMOS_WRITE(sec, RTC_SECONDS);
1469
1470 CMOS_WRITE(save_control, RTC_CONTROL);
1471 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1472
1473 return 0;
1474 }
1475 #endif /* CONFIG_PCI */
1476
1477 static void mostek_get_rtc_time(struct rtc_time *rtc_tm)
1478 {
1479 void __iomem *regs = mstk48t02_regs;
1480 u8 tmp;
1481
1482 spin_lock_irq(&mostek_lock);
1483
1484 tmp = mostek_read(regs + MOSTEK_CREG);
1485 tmp |= MSTK_CREG_READ;
1486 mostek_write(regs + MOSTEK_CREG, tmp);
1487
1488 rtc_tm->tm_sec = MSTK_REG_SEC(regs);
1489 rtc_tm->tm_min = MSTK_REG_MIN(regs);
1490 rtc_tm->tm_hour = MSTK_REG_HOUR(regs);
1491 rtc_tm->tm_mday = MSTK_REG_DOM(regs);
1492 rtc_tm->tm_mon = MSTK_REG_MONTH(regs);
1493 rtc_tm->tm_year = MSTK_CVT_YEAR( MSTK_REG_YEAR(regs) );
1494 rtc_tm->tm_wday = MSTK_REG_DOW(regs);
1495
1496 tmp = mostek_read(regs + MOSTEK_CREG);
1497 tmp &= ~MSTK_CREG_READ;
1498 mostek_write(regs + MOSTEK_CREG, tmp);
1499
1500 spin_unlock_irq(&mostek_lock);
1501
1502 rtc_tm->tm_mon--;
1503 rtc_tm->tm_wday--;
1504 rtc_tm->tm_year -= 1900;
1505 }
1506
1507 static int mostek_set_rtc_time(struct rtc_time *rtc_tm)
1508 {
1509 unsigned char mon, day, hrs, min, sec, wday;
1510 void __iomem *regs = mstk48t02_regs;
1511 unsigned int yrs;
1512 u8 tmp;
1513
1514 yrs = rtc_tm->tm_year + 1900;
1515 mon = rtc_tm->tm_mon + 1;
1516 day = rtc_tm->tm_mday;
1517 wday = rtc_tm->tm_wday + 1;
1518 hrs = rtc_tm->tm_hour;
1519 min = rtc_tm->tm_min;
1520 sec = rtc_tm->tm_sec;
1521
1522 spin_lock_irq(&mostek_lock);
1523
1524 tmp = mostek_read(regs + MOSTEK_CREG);
1525 tmp |= MSTK_CREG_WRITE;
1526 mostek_write(regs + MOSTEK_CREG, tmp);
1527
1528 MSTK_SET_REG_SEC(regs, sec);
1529 MSTK_SET_REG_MIN(regs, min);
1530 MSTK_SET_REG_HOUR(regs, hrs);
1531 MSTK_SET_REG_DOW(regs, wday);
1532 MSTK_SET_REG_DOM(regs, day);
1533 MSTK_SET_REG_MONTH(regs, mon);
1534 MSTK_SET_REG_YEAR(regs, yrs - MSTK_YEAR_ZERO);
1535
1536 tmp = mostek_read(regs + MOSTEK_CREG);
1537 tmp &= ~MSTK_CREG_WRITE;
1538 mostek_write(regs + MOSTEK_CREG, tmp);
1539
1540 spin_unlock_irq(&mostek_lock);
1541
1542 return 0;
1543 }
1544
1545 struct mini_rtc_ops {
1546 void (*get_rtc_time)(struct rtc_time *);
1547 int (*set_rtc_time)(struct rtc_time *);
1548 };
1549
1550 static struct mini_rtc_ops starfire_rtc_ops = {
1551 .get_rtc_time = starfire_get_rtc_time,
1552 .set_rtc_time = starfire_set_rtc_time,
1553 };
1554
1555 static struct mini_rtc_ops hypervisor_rtc_ops = {
1556 .get_rtc_time = hypervisor_get_rtc_time,
1557 .set_rtc_time = hypervisor_set_rtc_time,
1558 };
1559
1560 #ifdef CONFIG_PCI
1561 static struct mini_rtc_ops bq4802_rtc_ops = {
1562 .get_rtc_time = bq4802_get_rtc_time,
1563 .set_rtc_time = bq4802_set_rtc_time,
1564 };
1565
1566 static struct mini_rtc_ops cmos_rtc_ops = {
1567 .get_rtc_time = cmos_get_rtc_time,
1568 .set_rtc_time = cmos_set_rtc_time,
1569 };
1570 #endif /* CONFIG_PCI */
1571
1572 static struct mini_rtc_ops mostek_rtc_ops = {
1573 .get_rtc_time = mostek_get_rtc_time,
1574 .set_rtc_time = mostek_set_rtc_time,
1575 };
1576
1577 static struct mini_rtc_ops *mini_rtc_ops;
1578
1579 static inline void mini_get_rtc_time(struct rtc_time *time)
1580 {
1581 unsigned long flags;
1582
1583 spin_lock_irqsave(&rtc_lock, flags);
1584 mini_rtc_ops->get_rtc_time(time);
1585 spin_unlock_irqrestore(&rtc_lock, flags);
1586 }
1587
1588 static inline int mini_set_rtc_time(struct rtc_time *time)
1589 {
1590 unsigned long flags;
1591 int err;
1592
1593 spin_lock_irqsave(&rtc_lock, flags);
1594 err = mini_rtc_ops->set_rtc_time(time);
1595 spin_unlock_irqrestore(&rtc_lock, flags);
1596
1597 return err;
1598 }
1599
1600 static int mini_rtc_ioctl(struct inode *inode, struct file *file,
1601 unsigned int cmd, unsigned long arg)
1602 {
1603 struct rtc_time wtime;
1604 void __user *argp = (void __user *)arg;
1605
1606 switch (cmd) {
1607
1608 case RTC_PLL_GET:
1609 return -EINVAL;
1610
1611 case RTC_PLL_SET:
1612 return -EINVAL;
1613
1614 case RTC_UIE_OFF: /* disable ints from RTC updates. */
1615 return 0;
1616
1617 case RTC_UIE_ON: /* enable ints for RTC updates. */
1618 return -EINVAL;
1619
1620 case RTC_RD_TIME: /* Read the time/date from RTC */
1621 /* this doesn't get week-day, who cares */
1622 memset(&wtime, 0, sizeof(wtime));
1623 mini_get_rtc_time(&wtime);
1624
1625 return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;
1626
1627 case RTC_SET_TIME: /* Set the RTC */
1628 {
1629 int year, days;
1630
1631 if (!capable(CAP_SYS_TIME))
1632 return -EACCES;
1633
1634 if (copy_from_user(&wtime, argp, sizeof(wtime)))
1635 return -EFAULT;
1636
1637 year = wtime.tm_year + 1900;
1638 days = month_days[wtime.tm_mon] +
1639 ((wtime.tm_mon == 1) && leapyear(year));
1640
1641 if ((wtime.tm_mon < 0 || wtime.tm_mon > 11) ||
1642 (wtime.tm_mday < 1))
1643 return -EINVAL;
1644
1645 if (wtime.tm_mday < 0 || wtime.tm_mday > days)
1646 return -EINVAL;
1647
1648 if (wtime.tm_hour < 0 || wtime.tm_hour >= 24 ||
1649 wtime.tm_min < 0 || wtime.tm_min >= 60 ||
1650 wtime.tm_sec < 0 || wtime.tm_sec >= 60)
1651 return -EINVAL;
1652
1653 return mini_set_rtc_time(&wtime);
1654 }
1655 }
1656
1657 return -EINVAL;
1658 }
1659
1660 static int mini_rtc_open(struct inode *inode, struct file *file)
1661 {
1662 if (mini_rtc_status & RTC_IS_OPEN)
1663 return -EBUSY;
1664
1665 mini_rtc_status |= RTC_IS_OPEN;
1666
1667 return 0;
1668 }
1669
1670 static int mini_rtc_release(struct inode *inode, struct file *file)
1671 {
1672 mini_rtc_status &= ~RTC_IS_OPEN;
1673 return 0;
1674 }
1675
1676
1677 static const struct file_operations mini_rtc_fops = {
1678 .owner = THIS_MODULE,
1679 .ioctl = mini_rtc_ioctl,
1680 .open = mini_rtc_open,
1681 .release = mini_rtc_release,
1682 };
1683
1684 static struct miscdevice rtc_mini_dev =
1685 {
1686 .minor = RTC_MINOR,
1687 .name = "rtc",
1688 .fops = &mini_rtc_fops,
1689 };
1690
1691 static int __init rtc_mini_init(void)
1692 {
1693 int retval;
1694
1695 if (tlb_type == hypervisor)
1696 mini_rtc_ops = &hypervisor_rtc_ops;
1697 else if (this_is_starfire)
1698 mini_rtc_ops = &starfire_rtc_ops;
1699 #ifdef CONFIG_PCI
1700 else if (bq4802_regs)
1701 mini_rtc_ops = &bq4802_rtc_ops;
1702 else if (ds1287_regs)
1703 mini_rtc_ops = &cmos_rtc_ops;
1704 #endif /* CONFIG_PCI */
1705 else if (mstk48t02_regs)
1706 mini_rtc_ops = &mostek_rtc_ops;
1707 else
1708 return -ENODEV;
1709
1710 printk(KERN_INFO "Mini RTC Driver\n");
1711
1712 retval = misc_register(&rtc_mini_dev);
1713 if (retval < 0)
1714 return retval;
1715
1716 return 0;
1717 }
1718
1719 static void __exit rtc_mini_exit(void)
1720 {
1721 misc_deregister(&rtc_mini_dev);
1722 }
1723
1724 int __devinit read_current_timer(unsigned long *timer_val)
1725 {
1726 *timer_val = tick_ops->get_tick();
1727 return 0;
1728 }
1729
1730 module_init(rtc_mini_init);
1731 module_exit(rtc_mini_exit);
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