1 /* $Id: time.c,v 1.42 2002/01/23 14:33:55 davem Exp $
2 * time.c: UltraSparc timer and TOD clock support.
4 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
7 * Based largely on code which is:
9 * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/param.h>
17 #include <linux/string.h>
19 #include <linux/interrupt.h>
20 #include <linux/time.h>
21 #include <linux/timex.h>
22 #include <linux/init.h>
23 #include <linux/ioport.h>
24 #include <linux/mc146818rtc.h>
25 #include <linux/delay.h>
26 #include <linux/profile.h>
27 #include <linux/bcd.h>
28 #include <linux/jiffies.h>
29 #include <linux/cpufreq.h>
30 #include <linux/percpu.h>
31 #include <linux/profile.h>
32 #include <linux/miscdevice.h>
33 #include <linux/rtc.h>
34 #include <linux/kernel_stat.h>
35 #include <linux/clockchips.h>
36 #include <linux/clocksource.h>
38 #include <asm/oplib.h>
39 #include <asm/mostek.h>
40 #include <asm/timer.h>
44 #include <asm/of_device.h>
45 #include <asm/starfire.h>
47 #include <asm/sections.h>
48 #include <asm/cpudata.h>
49 #include <asm/uaccess.h>
51 #include <asm/irq_regs.h>
53 DEFINE_SPINLOCK(mostek_lock);
54 DEFINE_SPINLOCK(rtc_lock);
55 void __iomem *mstk48t02_regs = NULL;
57 unsigned long ds1287_regs = 0UL;
60 static void __iomem *mstk48t08_regs;
61 static void __iomem *mstk48t59_regs;
63 static int set_rtc_mmss(unsigned long);
65 #define TICK_PRIV_BIT (1UL << 63)
66 #define TICKCMP_IRQ_BIT (1UL << 63)
69 unsigned long profile_pc(struct pt_regs *regs)
71 unsigned long pc = instruction_pointer(regs);
73 if (in_lock_functions(pc))
74 return regs->u_regs[UREG_RETPC];
77 EXPORT_SYMBOL(profile_pc);
80 static void tick_disable_protection(void)
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.
90 "1: rd %%tick, %%g2\n"
91 " add %%g2, 6, %%g2\n"
92 " andn %%g2, %0, %%g2\n"
93 " wrpr %%g2, 0, %%tick\n"
100 static void tick_disable_irq(void)
102 __asm__ __volatile__(
106 "1: wr %0, 0x0, %%tick_cmpr\n"
107 " rd %%tick_cmpr, %%g0"
109 : "r" (TICKCMP_IRQ_BIT));
112 static void tick_init_tick(void)
114 tick_disable_protection();
118 static unsigned long tick_get_tick(void)
122 __asm__ __volatile__("rd %%tick, %0\n\t"
126 return ret & ~TICK_PRIV_BIT;
129 static int tick_add_compare(unsigned long adj)
131 unsigned long orig_tick, new_tick, new_compare;
133 __asm__ __volatile__("rd %%tick, %0"
136 orig_tick &= ~TICKCMP_IRQ_BIT;
138 /* Workaround for Spitfire Errata (#54 I think??), I discovered
139 * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
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
147 __asm__ __volatile__("ba,pt %%xcc, 1f\n\t"
148 " add %1, %2, %0\n\t"
151 "wr %0, 0, %%tick_cmpr\n\t"
152 "rd %%tick_cmpr, %%g0\n\t"
154 : "r" (orig_tick), "r" (adj));
156 __asm__ __volatile__("rd %%tick, %0"
158 new_tick &= ~TICKCMP_IRQ_BIT;
160 return ((long)(new_tick - (orig_tick+adj))) > 0L;
163 static unsigned long tick_add_tick(unsigned long adj)
165 unsigned long new_tick;
167 /* Also need to handle Blackbird bug here too. */
168 __asm__ __volatile__("rd %%tick, %0\n\t"
170 "wrpr %0, 0, %%tick\n\t"
177 static struct sparc64_tick_ops tick_operations __read_mostly = {
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,
187 struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
189 static void stick_disable_irq(void)
191 __asm__ __volatile__(
192 "wr %0, 0x0, %%asr25"
194 : "r" (TICKCMP_IRQ_BIT));
197 static void stick_init_tick(void)
199 /* Writes to the %tick and %stick register are not
200 * allowed on sun4v. The Hypervisor controls that
203 if (tlb_type != hypervisor) {
204 tick_disable_protection();
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"
213 : "r" (TICK_PRIV_BIT)
220 static unsigned long stick_get_tick(void)
224 __asm__ __volatile__("rd %%asr24, %0"
227 return ret & ~TICK_PRIV_BIT;
230 static unsigned long stick_add_tick(unsigned long adj)
232 unsigned long new_tick;
234 __asm__ __volatile__("rd %%asr24, %0\n\t"
236 "wr %0, 0, %%asr24\n\t"
243 static int stick_add_compare(unsigned long adj)
245 unsigned long orig_tick, new_tick;
247 __asm__ __volatile__("rd %%asr24, %0"
249 orig_tick &= ~TICKCMP_IRQ_BIT;
251 __asm__ __volatile__("wr %0, 0, %%asr25"
253 : "r" (orig_tick + adj));
255 __asm__ __volatile__("rd %%asr24, %0"
257 new_tick &= ~TICKCMP_IRQ_BIT;
259 return ((long)(new_tick - (orig_tick+adj))) > 0L;
262 static struct sparc64_tick_ops stick_operations __read_mostly = {
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,
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
277 * Since STICK is constantly updating, we have to access it carefully.
279 * The sequence we use to read is:
282 * 3) read high again, if it rolled re-read both low and high again.
284 * Writing STICK safely is also tricky:
285 * 1) write low to zero
289 #define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL
290 #define HBIRD_STICK_ADDR 0x1fe0000f070UL
292 static unsigned long __hbird_read_stick(void)
294 unsigned long ret, tmp1, tmp2, tmp3;
295 unsigned long addr = HBIRD_STICK_ADDR+8;
297 __asm__ __volatile__("ldxa [%1] %5, %2\n"
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"
304 "bne,a,pn %%xcc, 1b\n\t"
306 "sllx %4, 32, %4\n\t"
308 : "=&r" (ret), "=&r" (addr),
309 "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
310 : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
315 static void __hbird_write_stick(unsigned long val)
317 unsigned long low = (val & 0xffffffffUL);
318 unsigned long high = (val >> 32UL);
319 unsigned long addr = HBIRD_STICK_ADDR;
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"
327 : "0" (addr), "r" (low), "r" (high),
328 "i" (ASI_PHYS_BYPASS_EC_E));
331 static void __hbird_write_compare(unsigned long val)
333 unsigned long low = (val & 0xffffffffUL);
334 unsigned long high = (val >> 32UL);
335 unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
337 __asm__ __volatile__("stxa %3, [%0] %4\n\t"
338 "sub %0, 0x8, %0\n\t"
341 : "0" (addr), "r" (low), "r" (high),
342 "i" (ASI_PHYS_BYPASS_EC_E));
345 static void hbtick_disable_irq(void)
347 __hbird_write_compare(TICKCMP_IRQ_BIT);
350 static void hbtick_init_tick(void)
352 tick_disable_protection();
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
359 __hbird_write_stick(__hbird_read_stick());
361 hbtick_disable_irq();
364 static unsigned long hbtick_get_tick(void)
366 return __hbird_read_stick() & ~TICK_PRIV_BIT;
369 static unsigned long hbtick_add_tick(unsigned long adj)
373 val = __hbird_read_stick() + adj;
374 __hbird_write_stick(val);
379 static int hbtick_add_compare(unsigned long adj)
381 unsigned long val = __hbird_read_stick();
384 val &= ~TICKCMP_IRQ_BIT;
386 __hbird_write_compare(val);
388 val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
390 return ((long)(val2 - val)) > 0L;
393 static struct sparc64_tick_ops hbtick_operations __read_mostly = {
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,
403 static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
405 #define TICK_SIZE (tick_nsec / 1000)
407 #define USEC_AFTER 500000
408 #define USEC_BEFORE 500000
410 static void sync_cmos_clock(unsigned long dummy);
412 static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
414 static void sync_cmos_clock(unsigned long dummy)
416 struct timeval now, next;
420 * If we have an externally synchronized Linux clock, then update
421 * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
422 * called as close as possible to 500 ms before the new second starts.
423 * This code is run on a timer. If the clock is set, that timer
424 * may not expire at the correct time. Thus, we adjust...
428 * Not synced, exit, do not restart a timer (if one is
429 * running, let it run out).
433 do_gettimeofday(&now);
434 if (now.tv_usec >= USEC_AFTER - ((unsigned) TICK_SIZE) / 2 &&
435 now.tv_usec <= USEC_BEFORE + ((unsigned) TICK_SIZE) / 2)
436 fail = set_rtc_mmss(now.tv_sec);
438 next.tv_usec = USEC_AFTER - now.tv_usec;
439 if (next.tv_usec <= 0)
440 next.tv_usec += USEC_PER_SEC;
447 if (next.tv_usec >= USEC_PER_SEC) {
449 next.tv_usec -= USEC_PER_SEC;
451 mod_timer(&sync_cmos_timer, jiffies + timeval_to_jiffies(&next));
454 void notify_arch_cmos_timer(void)
456 mod_timer(&sync_cmos_timer, jiffies + 1);
459 /* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
460 static void __init kick_start_clock(void)
462 void __iomem *regs = mstk48t02_regs;
466 prom_printf("CLOCK: Clock was stopped. Kick start ");
468 spin_lock_irq(&mostek_lock);
470 /* Turn on the kick start bit to start the oscillator. */
471 tmp = mostek_read(regs + MOSTEK_CREG);
472 tmp |= MSTK_CREG_WRITE;
473 mostek_write(regs + MOSTEK_CREG, tmp);
474 tmp = mostek_read(regs + MOSTEK_SEC);
476 mostek_write(regs + MOSTEK_SEC, tmp);
477 tmp = mostek_read(regs + MOSTEK_HOUR);
478 tmp |= MSTK_KICK_START;
479 mostek_write(regs + MOSTEK_HOUR, tmp);
480 tmp = mostek_read(regs + MOSTEK_CREG);
481 tmp &= ~MSTK_CREG_WRITE;
482 mostek_write(regs + MOSTEK_CREG, tmp);
484 spin_unlock_irq(&mostek_lock);
486 /* Delay to allow the clock oscillator to start. */
487 sec = MSTK_REG_SEC(regs);
488 for (i = 0; i < 3; i++) {
489 while (sec == MSTK_REG_SEC(regs))
490 for (count = 0; count < 100000; count++)
493 sec = MSTK_REG_SEC(regs);
497 spin_lock_irq(&mostek_lock);
499 /* Turn off kick start and set a "valid" time and date. */
500 tmp = mostek_read(regs + MOSTEK_CREG);
501 tmp |= MSTK_CREG_WRITE;
502 mostek_write(regs + MOSTEK_CREG, tmp);
503 tmp = mostek_read(regs + MOSTEK_HOUR);
504 tmp &= ~MSTK_KICK_START;
505 mostek_write(regs + MOSTEK_HOUR, tmp);
506 MSTK_SET_REG_SEC(regs,0);
507 MSTK_SET_REG_MIN(regs,0);
508 MSTK_SET_REG_HOUR(regs,0);
509 MSTK_SET_REG_DOW(regs,5);
510 MSTK_SET_REG_DOM(regs,1);
511 MSTK_SET_REG_MONTH(regs,8);
512 MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
513 tmp = mostek_read(regs + MOSTEK_CREG);
514 tmp &= ~MSTK_CREG_WRITE;
515 mostek_write(regs + MOSTEK_CREG, tmp);
517 spin_unlock_irq(&mostek_lock);
519 /* Ensure the kick start bit is off. If it isn't, turn it off. */
520 while (mostek_read(regs + MOSTEK_HOUR) & MSTK_KICK_START) {
521 prom_printf("CLOCK: Kick start still on!\n");
523 spin_lock_irq(&mostek_lock);
525 tmp = mostek_read(regs + MOSTEK_CREG);
526 tmp |= MSTK_CREG_WRITE;
527 mostek_write(regs + MOSTEK_CREG, tmp);
529 tmp = mostek_read(regs + MOSTEK_HOUR);
530 tmp &= ~MSTK_KICK_START;
531 mostek_write(regs + MOSTEK_HOUR, tmp);
533 tmp = mostek_read(regs + MOSTEK_CREG);
534 tmp &= ~MSTK_CREG_WRITE;
535 mostek_write(regs + MOSTEK_CREG, tmp);
537 spin_unlock_irq(&mostek_lock);
540 prom_printf("CLOCK: Kick start procedure successful.\n");
543 /* Return nonzero if the clock chip battery is low. */
544 static int __init has_low_battery(void)
546 void __iomem *regs = mstk48t02_regs;
549 spin_lock_irq(&mostek_lock);
551 data1 = mostek_read(regs + MOSTEK_EEPROM); /* Read some data. */
552 mostek_write(regs + MOSTEK_EEPROM, ~data1); /* Write back the complement. */
553 data2 = mostek_read(regs + MOSTEK_EEPROM); /* Read back the complement. */
554 mostek_write(regs + MOSTEK_EEPROM, data1); /* Restore original value. */
556 spin_unlock_irq(&mostek_lock);
558 return (data1 == data2); /* Was the write blocked? */
561 /* Probe for the real time clock chip. */
562 static void __init set_system_time(void)
564 unsigned int year, mon, day, hour, min, sec;
565 void __iomem *mregs = mstk48t02_regs;
567 unsigned long dregs = ds1287_regs;
569 unsigned long dregs = 0UL;
573 if (!mregs && !dregs) {
574 prom_printf("Something wrong, clock regs not mapped yet.\n");
579 spin_lock_irq(&mostek_lock);
581 /* Traditional Mostek chip. */
582 tmp = mostek_read(mregs + MOSTEK_CREG);
583 tmp |= MSTK_CREG_READ;
584 mostek_write(mregs + MOSTEK_CREG, tmp);
586 sec = MSTK_REG_SEC(mregs);
587 min = MSTK_REG_MIN(mregs);
588 hour = MSTK_REG_HOUR(mregs);
589 day = MSTK_REG_DOM(mregs);
590 mon = MSTK_REG_MONTH(mregs);
591 year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
593 /* Dallas 12887 RTC chip. */
596 sec = CMOS_READ(RTC_SECONDS);
597 min = CMOS_READ(RTC_MINUTES);
598 hour = CMOS_READ(RTC_HOURS);
599 day = CMOS_READ(RTC_DAY_OF_MONTH);
600 mon = CMOS_READ(RTC_MONTH);
601 year = CMOS_READ(RTC_YEAR);
602 } while (sec != CMOS_READ(RTC_SECONDS));
604 if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
612 if ((year += 1900) < 1970)
616 xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
617 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
618 set_normalized_timespec(&wall_to_monotonic,
619 -xtime.tv_sec, -xtime.tv_nsec);
622 tmp = mostek_read(mregs + MOSTEK_CREG);
623 tmp &= ~MSTK_CREG_READ;
624 mostek_write(mregs + MOSTEK_CREG, tmp);
626 spin_unlock_irq(&mostek_lock);
630 /* davem suggests we keep this within the 4M locked kernel image */
631 static u32 starfire_get_time(void)
633 static char obp_gettod[32];
636 sprintf(obp_gettod, "h# %08x unix-gettod",
637 (unsigned int) (long) &unix_tod);
638 prom_feval(obp_gettod);
643 static int starfire_set_time(u32 val)
645 /* Do nothing, time is set using the service processor
646 * console on this platform.
651 static u32 hypervisor_get_time(void)
653 register unsigned long func asm("%o5");
654 register unsigned long arg0 asm("%o0");
655 register unsigned long arg1 asm("%o1");
659 func = HV_FAST_TOD_GET;
662 __asm__ __volatile__("ta %6"
663 : "=&r" (func), "=&r" (arg0), "=&r" (arg1)
664 : "0" (func), "1" (arg0), "2" (arg1),
668 if (arg0 == HV_EWOULDBLOCK) {
673 printk(KERN_WARNING "SUN4V: tod_get() timed out.\n");
676 printk(KERN_WARNING "SUN4V: tod_get() not supported.\n");
680 static int hypervisor_set_time(u32 secs)
682 register unsigned long func asm("%o5");
683 register unsigned long arg0 asm("%o0");
687 func = HV_FAST_TOD_SET;
689 __asm__ __volatile__("ta %4"
690 : "=&r" (func), "=&r" (arg0)
691 : "0" (func), "1" (arg0),
695 if (arg0 == HV_EWOULDBLOCK) {
700 printk(KERN_WARNING "SUN4V: tod_set() timed out.\n");
703 printk(KERN_WARNING "SUN4V: tod_set() not supported.\n");
707 static int __init clock_model_matches(const char *model)
709 if (strcmp(model, "mk48t02") &&
710 strcmp(model, "mk48t08") &&
711 strcmp(model, "mk48t59") &&
712 strcmp(model, "m5819") &&
713 strcmp(model, "m5819p") &&
714 strcmp(model, "m5823") &&
715 strcmp(model, "ds1287"))
721 static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match)
723 struct device_node *dp = op->node;
724 const char *model = of_get_property(dp, "model", NULL);
725 unsigned long size, flags;
728 if (!model || !clock_model_matches(model))
731 /* On an Enterprise system there can be multiple mostek clocks.
732 * We should only match the one that is on the central FHC bus.
734 if (!strcmp(dp->parent->name, "fhc") &&
735 strcmp(dp->parent->parent->name, "central") != 0)
738 size = (op->resource[0].end - op->resource[0].start) + 1;
739 regs = of_ioremap(&op->resource[0], 0, size, "clock");
744 if (!strcmp(model, "ds1287") ||
745 !strcmp(model, "m5819") ||
746 !strcmp(model, "m5819p") ||
747 !strcmp(model, "m5823")) {
748 ds1287_regs = (unsigned long) regs;
751 if (model[5] == '0' && model[6] == '2') {
752 mstk48t02_regs = regs;
753 } else if(model[5] == '0' && model[6] == '8') {
754 mstk48t08_regs = regs;
755 mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02;
757 mstk48t59_regs = regs;
758 mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
761 printk(KERN_INFO "%s: Clock regs at %p\n", dp->full_name, regs);
763 local_irq_save(flags);
765 if (mstk48t02_regs != NULL) {
766 /* Report a low battery voltage condition. */
767 if (has_low_battery())
768 prom_printf("NVRAM: Low battery voltage!\n");
770 /* Kick start the clock if it is completely stopped. */
771 if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
777 local_irq_restore(flags);
782 static struct of_device_id clock_match[] = {
792 static struct of_platform_driver clock_driver = {
794 .match_table = clock_match,
795 .probe = clock_probe,
798 static int __init clock_init(void)
800 if (this_is_starfire) {
801 xtime.tv_sec = starfire_get_time();
802 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
803 set_normalized_timespec(&wall_to_monotonic,
804 -xtime.tv_sec, -xtime.tv_nsec);
807 if (tlb_type == hypervisor) {
808 xtime.tv_sec = hypervisor_get_time();
809 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
810 set_normalized_timespec(&wall_to_monotonic,
811 -xtime.tv_sec, -xtime.tv_nsec);
815 return of_register_driver(&clock_driver, &of_bus_type);
818 /* Must be after subsys_initcall() so that busses are probed. Must
819 * be before device_initcall() because things like the RTC driver
820 * need to see the clock registers.
822 fs_initcall(clock_init);
824 /* This is gets the master TICK_INT timer going. */
825 static unsigned long sparc64_init_timers(void)
827 struct device_node *dp;
828 struct property *prop;
831 extern void smp_tick_init(void);
834 dp = of_find_node_by_path("/");
835 if (tlb_type == spitfire) {
836 unsigned long ver, manuf, impl;
838 __asm__ __volatile__ ("rdpr %%ver, %0"
840 manuf = ((ver >> 48) & 0xffff);
841 impl = ((ver >> 32) & 0xffff);
842 if (manuf == 0x17 && impl == 0x13) {
843 /* Hummingbird, aka Ultra-IIe */
844 tick_ops = &hbtick_operations;
845 prop = of_find_property(dp, "stick-frequency", NULL);
847 tick_ops = &tick_operations;
848 cpu_find_by_instance(0, &dp, NULL);
849 prop = of_find_property(dp, "clock-frequency", NULL);
852 tick_ops = &stick_operations;
853 prop = of_find_property(dp, "stick-frequency", NULL);
855 clock = *(unsigned int *) prop->value;
865 unsigned long clock_tick_ref;
866 unsigned int ref_freq;
868 static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
870 unsigned long sparc64_get_clock_tick(unsigned int cpu)
872 struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
874 if (ft->clock_tick_ref)
875 return ft->clock_tick_ref;
876 return cpu_data(cpu).clock_tick;
879 #ifdef CONFIG_CPU_FREQ
881 static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
884 struct cpufreq_freqs *freq = data;
885 unsigned int cpu = freq->cpu;
886 struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
889 ft->ref_freq = freq->old;
890 ft->clock_tick_ref = cpu_data(cpu).clock_tick;
892 if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) ||
893 (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
894 (val == CPUFREQ_RESUMECHANGE)) {
895 cpu_data(cpu).clock_tick =
896 cpufreq_scale(ft->clock_tick_ref,
904 static struct notifier_block sparc64_cpufreq_notifier_block = {
905 .notifier_call = sparc64_cpufreq_notifier
908 #endif /* CONFIG_CPU_FREQ */
910 static int sparc64_next_event(unsigned long delta,
911 struct clock_event_device *evt)
913 return tick_ops->add_compare(delta) ? -ETIME : 0;
916 static void sparc64_timer_setup(enum clock_event_mode mode,
917 struct clock_event_device *evt)
920 case CLOCK_EVT_MODE_ONESHOT:
923 case CLOCK_EVT_MODE_SHUTDOWN:
924 tick_ops->disable_irq();
927 case CLOCK_EVT_MODE_PERIODIC:
928 case CLOCK_EVT_MODE_UNUSED:
934 static struct clock_event_device sparc64_clockevent = {
935 .features = CLOCK_EVT_FEAT_ONESHOT,
936 .set_mode = sparc64_timer_setup,
937 .set_next_event = sparc64_next_event,
942 static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
944 void timer_interrupt(int irq, struct pt_regs *regs)
946 struct pt_regs *old_regs = set_irq_regs(regs);
947 unsigned long tick_mask = tick_ops->softint_mask;
948 int cpu = smp_processor_id();
949 struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
951 clear_softint(tick_mask);
955 kstat_this_cpu.irqs[0]++;
957 if (unlikely(!evt->event_handler)) {
959 "Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
961 evt->event_handler(evt);
965 set_irq_regs(old_regs);
968 void __devinit setup_sparc64_timer(void)
970 struct clock_event_device *sevt;
971 unsigned long pstate;
973 /* Guarantee that the following sequences execute
976 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
977 "wrpr %0, %1, %%pstate"
981 tick_ops->init_tick();
983 /* Restore PSTATE_IE. */
984 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
988 sevt = &__get_cpu_var(sparc64_events);
990 memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
991 sevt->cpumask = cpumask_of_cpu(smp_processor_id());
993 clockevents_register_device(sevt);
996 #define SPARC64_NSEC_PER_CYC_SHIFT 32UL
998 static struct clocksource clocksource_tick = {
1000 .mask = CLOCKSOURCE_MASK(64),
1002 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
1005 static void __init setup_clockevent_multiplier(unsigned long hz)
1007 unsigned long mult, shift = 32;
1010 mult = div_sc(hz, NSEC_PER_SEC, shift);
1011 if (mult && (mult >> 32UL) == 0UL)
1017 sparc64_clockevent.shift = shift;
1018 sparc64_clockevent.mult = mult;
1021 void __init time_init(void)
1023 unsigned long clock = sparc64_init_timers();
1025 timer_ticks_per_nsec_quotient =
1026 clocksource_hz2mult(clock, SPARC64_NSEC_PER_CYC_SHIFT);
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;
1034 printk("clocksource: mult[%x] shift[%d]\n",
1035 clocksource_tick.mult, clocksource_tick.shift);
1037 clocksource_register(&clocksource_tick);
1039 sparc64_clockevent.name = tick_ops->name;
1041 setup_clockevent_multiplier(clock);
1043 sparc64_clockevent.max_delta_ns =
1044 clockevent_delta2ns(0x7fffffffffffffff, &sparc64_clockevent);
1045 sparc64_clockevent.min_delta_ns =
1046 clockevent_delta2ns(0xF, &sparc64_clockevent);
1048 printk("clockevent: mult[%lx] shift[%d]\n",
1049 sparc64_clockevent.mult, sparc64_clockevent.shift);
1051 setup_sparc64_timer();
1053 #ifdef CONFIG_CPU_FREQ
1054 cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
1055 CPUFREQ_TRANSITION_NOTIFIER);
1059 unsigned long long sched_clock(void)
1061 unsigned long ticks = tick_ops->get_tick();
1063 return (ticks * timer_ticks_per_nsec_quotient)
1064 >> SPARC64_NSEC_PER_CYC_SHIFT;
1067 static int set_rtc_mmss(unsigned long nowtime)
1069 int real_seconds, real_minutes, chip_minutes;
1070 void __iomem *mregs = mstk48t02_regs;
1072 unsigned long dregs = ds1287_regs;
1074 unsigned long dregs = 0UL;
1076 unsigned long flags;
1080 * Not having a register set can lead to trouble.
1081 * Also starfire doesn't have a tod clock.
1083 if (!mregs && !dregs)
1087 spin_lock_irqsave(&mostek_lock, flags);
1089 /* Read the current RTC minutes. */
1090 tmp = mostek_read(mregs + MOSTEK_CREG);
1091 tmp |= MSTK_CREG_READ;
1092 mostek_write(mregs + MOSTEK_CREG, tmp);
1094 chip_minutes = MSTK_REG_MIN(mregs);
1096 tmp = mostek_read(mregs + MOSTEK_CREG);
1097 tmp &= ~MSTK_CREG_READ;
1098 mostek_write(mregs + MOSTEK_CREG, tmp);
1101 * since we're only adjusting minutes and seconds,
1102 * don't interfere with hour overflow. This avoids
1103 * messing with unknown time zones but requires your
1104 * RTC not to be off by more than 15 minutes
1106 real_seconds = nowtime % 60;
1107 real_minutes = nowtime / 60;
1108 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1109 real_minutes += 30; /* correct for half hour time zone */
1112 if (abs(real_minutes - chip_minutes) < 30) {
1113 tmp = mostek_read(mregs + MOSTEK_CREG);
1114 tmp |= MSTK_CREG_WRITE;
1115 mostek_write(mregs + MOSTEK_CREG, tmp);
1117 MSTK_SET_REG_SEC(mregs,real_seconds);
1118 MSTK_SET_REG_MIN(mregs,real_minutes);
1120 tmp = mostek_read(mregs + MOSTEK_CREG);
1121 tmp &= ~MSTK_CREG_WRITE;
1122 mostek_write(mregs + MOSTEK_CREG, tmp);
1124 spin_unlock_irqrestore(&mostek_lock, flags);
1128 spin_unlock_irqrestore(&mostek_lock, flags);
1134 unsigned char save_control, save_freq_select;
1136 /* Stolen from arch/i386/kernel/time.c, see there for
1137 * credits and descriptive comments.
1139 spin_lock_irqsave(&rtc_lock, flags);
1140 save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
1141 CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
1143 save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
1144 CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
1146 chip_minutes = CMOS_READ(RTC_MINUTES);
1147 if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
1148 BCD_TO_BIN(chip_minutes);
1149 real_seconds = nowtime % 60;
1150 real_minutes = nowtime / 60;
1151 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1155 if (abs(real_minutes - chip_minutes) < 30) {
1156 if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1157 BIN_TO_BCD(real_seconds);
1158 BIN_TO_BCD(real_minutes);
1160 CMOS_WRITE(real_seconds,RTC_SECONDS);
1161 CMOS_WRITE(real_minutes,RTC_MINUTES);
1164 "set_rtc_mmss: can't update from %d to %d\n",
1165 chip_minutes, real_minutes);
1169 CMOS_WRITE(save_control, RTC_CONTROL);
1170 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1171 spin_unlock_irqrestore(&rtc_lock, flags);
1177 #define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
1178 static unsigned char mini_rtc_status; /* bitmapped status byte. */
1181 #define STARTOFTIME 1970
1182 #define SECDAY 86400L
1183 #define SECYR (SECDAY * 365)
1184 #define leapyear(year) ((year) % 4 == 0 && \
1185 ((year) % 100 != 0 || (year) % 400 == 0))
1186 #define days_in_year(a) (leapyear(a) ? 366 : 365)
1187 #define days_in_month(a) (month_days[(a) - 1])
1189 static int month_days[12] = {
1190 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
1194 * This only works for the Gregorian calendar - i.e. after 1752 (in the UK)
1196 static void GregorianDay(struct rtc_time * tm)
1201 int MonthOffset[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
1203 lastYear = tm->tm_year - 1;
1206 * Number of leap corrections to apply up to end of last year
1208 leapsToDate = lastYear / 4 - lastYear / 100 + lastYear / 400;
1211 * This year is a leap year if it is divisible by 4 except when it is
1212 * divisible by 100 unless it is divisible by 400
1214 * e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 was
1216 day = tm->tm_mon > 2 && leapyear(tm->tm_year);
1218 day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] +
1221 tm->tm_wday = day % 7;
1224 static void to_tm(int tim, struct rtc_time *tm)
1227 register long hms, day;
1232 /* Hours, minutes, seconds are easy */
1233 tm->tm_hour = hms / 3600;
1234 tm->tm_min = (hms % 3600) / 60;
1235 tm->tm_sec = (hms % 3600) % 60;
1237 /* Number of years in days */
1238 for (i = STARTOFTIME; day >= days_in_year(i); i++)
1239 day -= days_in_year(i);
1242 /* Number of months in days left */
1243 if (leapyear(tm->tm_year))
1244 days_in_month(FEBRUARY) = 29;
1245 for (i = 1; day >= days_in_month(i); i++)
1246 day -= days_in_month(i);
1247 days_in_month(FEBRUARY) = 28;
1250 /* Days are what is left over (+1) from all that. */
1251 tm->tm_mday = day + 1;
1254 * Determine the day of week
1259 /* Both Starfire and SUN4V give us seconds since Jan 1st, 1970,
1260 * aka Unix time. So we have to convert to/from rtc_time.
1262 static inline void mini_get_rtc_time(struct rtc_time *time)
1264 unsigned long flags;
1267 spin_lock_irqsave(&rtc_lock, flags);
1269 if (this_is_starfire)
1270 seconds = starfire_get_time();
1271 else if (tlb_type == hypervisor)
1272 seconds = hypervisor_get_time();
1273 spin_unlock_irqrestore(&rtc_lock, flags);
1275 to_tm(seconds, time);
1276 time->tm_year -= 1900;
1280 static inline int mini_set_rtc_time(struct rtc_time *time)
1282 u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
1283 time->tm_mday, time->tm_hour,
1284 time->tm_min, time->tm_sec);
1285 unsigned long flags;
1288 spin_lock_irqsave(&rtc_lock, flags);
1290 if (this_is_starfire)
1291 err = starfire_set_time(seconds);
1292 else if (tlb_type == hypervisor)
1293 err = hypervisor_set_time(seconds);
1294 spin_unlock_irqrestore(&rtc_lock, flags);
1299 static int mini_rtc_ioctl(struct inode *inode, struct file *file,
1300 unsigned int cmd, unsigned long arg)
1302 struct rtc_time wtime;
1303 void __user *argp = (void __user *)arg;
1313 case RTC_UIE_OFF: /* disable ints from RTC updates. */
1316 case RTC_UIE_ON: /* enable ints for RTC updates. */
1319 case RTC_RD_TIME: /* Read the time/date from RTC */
1320 /* this doesn't get week-day, who cares */
1321 memset(&wtime, 0, sizeof(wtime));
1322 mini_get_rtc_time(&wtime);
1324 return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;
1326 case RTC_SET_TIME: /* Set the RTC */
1330 if (!capable(CAP_SYS_TIME))
1333 if (copy_from_user(&wtime, argp, sizeof(wtime)))
1336 year = wtime.tm_year + 1900;
1337 days = month_days[wtime.tm_mon] +
1338 ((wtime.tm_mon == 1) && leapyear(year));
1340 if ((wtime.tm_mon < 0 || wtime.tm_mon > 11) ||
1341 (wtime.tm_mday < 1))
1344 if (wtime.tm_mday < 0 || wtime.tm_mday > days)
1347 if (wtime.tm_hour < 0 || wtime.tm_hour >= 24 ||
1348 wtime.tm_min < 0 || wtime.tm_min >= 60 ||
1349 wtime.tm_sec < 0 || wtime.tm_sec >= 60)
1352 return mini_set_rtc_time(&wtime);
1359 static int mini_rtc_open(struct inode *inode, struct file *file)
1361 if (mini_rtc_status & RTC_IS_OPEN)
1364 mini_rtc_status |= RTC_IS_OPEN;
1369 static int mini_rtc_release(struct inode *inode, struct file *file)
1371 mini_rtc_status &= ~RTC_IS_OPEN;
1376 static const struct file_operations mini_rtc_fops = {
1377 .owner = THIS_MODULE,
1378 .ioctl = mini_rtc_ioctl,
1379 .open = mini_rtc_open,
1380 .release = mini_rtc_release,
1383 static struct miscdevice rtc_mini_dev =
1387 .fops = &mini_rtc_fops,
1390 static int __init rtc_mini_init(void)
1394 if (tlb_type != hypervisor && !this_is_starfire)
1397 printk(KERN_INFO "Mini RTC Driver\n");
1399 retval = misc_register(&rtc_mini_dev);
1406 static void __exit rtc_mini_exit(void)
1408 misc_deregister(&rtc_mini_dev);
1412 module_init(rtc_mini_init);
1413 module_exit(rtc_mini_exit);