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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/export.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/rtc/m48t59.h>
33#include <linux/kernel_stat.h>
34#include <linux/clockchips.h>
35#include <linux/clocksource.h>
36#include <linux/of_device.h>
37#include <linux/platform_device.h>
38#include <linux/ftrace.h>
39
40#include <asm/oplib.h>
41#include <asm/timer.h>
42#include <asm/irq.h>
43#include <asm/io.h>
44#include <asm/prom.h>
45#include <asm/starfire.h>
46#include <asm/smp.h>
47#include <asm/sections.h>
48#include <asm/cpudata.h>
49#include <asm/uaccess.h>
50#include <asm/irq_regs.h>
51
52#include "entry.h"
53
54DEFINE_SPINLOCK(rtc_lock);
55
56#define TICK_PRIV_BIT (1UL << 63)
57#define TICKCMP_IRQ_BIT (1UL << 63)
58
59#ifdef CONFIG_SMP
60unsigned long profile_pc(struct pt_regs *regs)
61{
62 unsigned long pc = instruction_pointer(regs);
63
64 if (in_lock_functions(pc))
65 return regs->u_regs[UREG_RETPC];
66 return pc;
67}
68EXPORT_SYMBOL(profile_pc);
69#endif
70
71static void tick_disable_protection(void)
72{
73 /* Set things up so user can access tick register for profiling
74 * purposes. Also workaround BB_ERRATA_1 by doing a dummy
75 * read back of %tick after writing it.
76 */
77 __asm__ __volatile__(
78 " ba,pt %%xcc, 1f\n"
79 " nop\n"
80 " .align 64\n"
81 "1: rd %%tick, %%g2\n"
82 " add %%g2, 6, %%g2\n"
83 " andn %%g2, %0, %%g2\n"
84 " wrpr %%g2, 0, %%tick\n"
85 " rdpr %%tick, %%g0"
86 : /* no outputs */
87 : "r" (TICK_PRIV_BIT)
88 : "g2");
89}
90
91static void tick_disable_irq(void)
92{
93 __asm__ __volatile__(
94 " ba,pt %%xcc, 1f\n"
95 " nop\n"
96 " .align 64\n"
97 "1: wr %0, 0x0, %%tick_cmpr\n"
98 " rd %%tick_cmpr, %%g0"
99 : /* no outputs */
100 : "r" (TICKCMP_IRQ_BIT));
101}
102
103static void tick_init_tick(void)
104{
105 tick_disable_protection();
106 tick_disable_irq();
107}
108
109static unsigned long long tick_get_tick(void)
110{
111 unsigned long ret;
112
113 __asm__ __volatile__("rd %%tick, %0\n\t"
114 "mov %0, %0"
115 : "=r" (ret));
116
117 return ret & ~TICK_PRIV_BIT;
118}
119
120static int tick_add_compare(unsigned long adj)
121{
122 unsigned long orig_tick, new_tick, new_compare;
123
124 __asm__ __volatile__("rd %%tick, %0"
125 : "=r" (orig_tick));
126
127 orig_tick &= ~TICKCMP_IRQ_BIT;
128
129 /* Workaround for Spitfire Errata (#54 I think??), I discovered
130 * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
131 * number 103640.
132 *
133 * On Blackbird writes to %tick_cmpr can fail, the
134 * workaround seems to be to execute the wr instruction
135 * at the start of an I-cache line, and perform a dummy
136 * read back from %tick_cmpr right after writing to it. -DaveM
137 */
138 __asm__ __volatile__("ba,pt %%xcc, 1f\n\t"
139 " add %1, %2, %0\n\t"
140 ".align 64\n"
141 "1:\n\t"
142 "wr %0, 0, %%tick_cmpr\n\t"
143 "rd %%tick_cmpr, %%g0\n\t"
144 : "=r" (new_compare)
145 : "r" (orig_tick), "r" (adj));
146
147 __asm__ __volatile__("rd %%tick, %0"
148 : "=r" (new_tick));
149 new_tick &= ~TICKCMP_IRQ_BIT;
150
151 return ((long)(new_tick - (orig_tick+adj))) > 0L;
152}
153
154static unsigned long tick_add_tick(unsigned long adj)
155{
156 unsigned long new_tick;
157
158 /* Also need to handle Blackbird bug here too. */
159 __asm__ __volatile__("rd %%tick, %0\n\t"
160 "add %0, %1, %0\n\t"
161 "wrpr %0, 0, %%tick\n\t"
162 : "=&r" (new_tick)
163 : "r" (adj));
164
165 return new_tick;
166}
167
168static struct sparc64_tick_ops tick_operations __read_mostly = {
169 .name = "tick",
170 .init_tick = tick_init_tick,
171 .disable_irq = tick_disable_irq,
172 .get_tick = tick_get_tick,
173 .add_tick = tick_add_tick,
174 .add_compare = tick_add_compare,
175 .softint_mask = 1UL << 0,
176};
177
178struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
179EXPORT_SYMBOL(tick_ops);
180
181static void stick_disable_irq(void)
182{
183 __asm__ __volatile__(
184 "wr %0, 0x0, %%asr25"
185 : /* no outputs */
186 : "r" (TICKCMP_IRQ_BIT));
187}
188
189static void stick_init_tick(void)
190{
191 /* Writes to the %tick and %stick register are not
192 * allowed on sun4v. The Hypervisor controls that
193 * bit, per-strand.
194 */
195 if (tlb_type != hypervisor) {
196 tick_disable_protection();
197 tick_disable_irq();
198
199 /* Let the user get at STICK too. */
200 __asm__ __volatile__(
201 " rd %%asr24, %%g2\n"
202 " andn %%g2, %0, %%g2\n"
203 " wr %%g2, 0, %%asr24"
204 : /* no outputs */
205 : "r" (TICK_PRIV_BIT)
206 : "g1", "g2");
207 }
208
209 stick_disable_irq();
210}
211
212static unsigned long long stick_get_tick(void)
213{
214 unsigned long ret;
215
216 __asm__ __volatile__("rd %%asr24, %0"
217 : "=r" (ret));
218
219 return ret & ~TICK_PRIV_BIT;
220}
221
222static unsigned long stick_add_tick(unsigned long adj)
223{
224 unsigned long new_tick;
225
226 __asm__ __volatile__("rd %%asr24, %0\n\t"
227 "add %0, %1, %0\n\t"
228 "wr %0, 0, %%asr24\n\t"
229 : "=&r" (new_tick)
230 : "r" (adj));
231
232 return new_tick;
233}
234
235static int stick_add_compare(unsigned long adj)
236{
237 unsigned long orig_tick, new_tick;
238
239 __asm__ __volatile__("rd %%asr24, %0"
240 : "=r" (orig_tick));
241 orig_tick &= ~TICKCMP_IRQ_BIT;
242
243 __asm__ __volatile__("wr %0, 0, %%asr25"
244 : /* no outputs */
245 : "r" (orig_tick + adj));
246
247 __asm__ __volatile__("rd %%asr24, %0"
248 : "=r" (new_tick));
249 new_tick &= ~TICKCMP_IRQ_BIT;
250
251 return ((long)(new_tick - (orig_tick+adj))) > 0L;
252}
253
254static struct sparc64_tick_ops stick_operations __read_mostly = {
255 .name = "stick",
256 .init_tick = stick_init_tick,
257 .disable_irq = stick_disable_irq,
258 .get_tick = stick_get_tick,
259 .add_tick = stick_add_tick,
260 .add_compare = stick_add_compare,
261 .softint_mask = 1UL << 16,
262};
263
264/* On Hummingbird the STICK/STICK_CMPR register is implemented
265 * in I/O space. There are two 64-bit registers each, the
266 * first holds the low 32-bits of the value and the second holds
267 * the high 32-bits.
268 *
269 * Since STICK is constantly updating, we have to access it carefully.
270 *
271 * The sequence we use to read is:
272 * 1) read high
273 * 2) read low
274 * 3) read high again, if it rolled re-read both low and high again.
275 *
276 * Writing STICK safely is also tricky:
277 * 1) write low to zero
278 * 2) write high
279 * 3) write low
280 */
281#define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL
282#define HBIRD_STICK_ADDR 0x1fe0000f070UL
283
284static unsigned long __hbird_read_stick(void)
285{
286 unsigned long ret, tmp1, tmp2, tmp3;
287 unsigned long addr = HBIRD_STICK_ADDR+8;
288
289 __asm__ __volatile__("ldxa [%1] %5, %2\n"
290 "1:\n\t"
291 "sub %1, 0x8, %1\n\t"
292 "ldxa [%1] %5, %3\n\t"
293 "add %1, 0x8, %1\n\t"
294 "ldxa [%1] %5, %4\n\t"
295 "cmp %4, %2\n\t"
296 "bne,a,pn %%xcc, 1b\n\t"
297 " mov %4, %2\n\t"
298 "sllx %4, 32, %4\n\t"
299 "or %3, %4, %0\n\t"
300 : "=&r" (ret), "=&r" (addr),
301 "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
302 : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
303
304 return ret;
305}
306
307static void __hbird_write_stick(unsigned long val)
308{
309 unsigned long low = (val & 0xffffffffUL);
310 unsigned long high = (val >> 32UL);
311 unsigned long addr = HBIRD_STICK_ADDR;
312
313 __asm__ __volatile__("stxa %%g0, [%0] %4\n\t"
314 "add %0, 0x8, %0\n\t"
315 "stxa %3, [%0] %4\n\t"
316 "sub %0, 0x8, %0\n\t"
317 "stxa %2, [%0] %4"
318 : "=&r" (addr)
319 : "0" (addr), "r" (low), "r" (high),
320 "i" (ASI_PHYS_BYPASS_EC_E));
321}
322
323static void __hbird_write_compare(unsigned long val)
324{
325 unsigned long low = (val & 0xffffffffUL);
326 unsigned long high = (val >> 32UL);
327 unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
328
329 __asm__ __volatile__("stxa %3, [%0] %4\n\t"
330 "sub %0, 0x8, %0\n\t"
331 "stxa %2, [%0] %4"
332 : "=&r" (addr)
333 : "0" (addr), "r" (low), "r" (high),
334 "i" (ASI_PHYS_BYPASS_EC_E));
335}
336
337static void hbtick_disable_irq(void)
338{
339 __hbird_write_compare(TICKCMP_IRQ_BIT);
340}
341
342static void hbtick_init_tick(void)
343{
344 tick_disable_protection();
345
346 /* XXX This seems to be necessary to 'jumpstart' Hummingbird
347 * XXX into actually sending STICK interrupts. I think because
348 * XXX of how we store %tick_cmpr in head.S this somehow resets the
349 * XXX {TICK + STICK} interrupt mux. -DaveM
350 */
351 __hbird_write_stick(__hbird_read_stick());
352
353 hbtick_disable_irq();
354}
355
356static unsigned long long hbtick_get_tick(void)
357{
358 return __hbird_read_stick() & ~TICK_PRIV_BIT;
359}
360
361static unsigned long hbtick_add_tick(unsigned long adj)
362{
363 unsigned long val;
364
365 val = __hbird_read_stick() + adj;
366 __hbird_write_stick(val);
367
368 return val;
369}
370
371static int hbtick_add_compare(unsigned long adj)
372{
373 unsigned long val = __hbird_read_stick();
374 unsigned long val2;
375
376 val &= ~TICKCMP_IRQ_BIT;
377 val += adj;
378 __hbird_write_compare(val);
379
380 val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
381
382 return ((long)(val2 - val)) > 0L;
383}
384
385static struct sparc64_tick_ops hbtick_operations __read_mostly = {
386 .name = "hbtick",
387 .init_tick = hbtick_init_tick,
388 .disable_irq = hbtick_disable_irq,
389 .get_tick = hbtick_get_tick,
390 .add_tick = hbtick_add_tick,
391 .add_compare = hbtick_add_compare,
392 .softint_mask = 1UL << 0,
393};
394
395static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
396
397int update_persistent_clock(struct timespec now)
398{
399 struct rtc_device *rtc = rtc_class_open("rtc0");
400 int err = -1;
401
402 if (rtc) {
403 err = rtc_set_mmss(rtc, now.tv_sec);
404 rtc_class_close(rtc);
405 }
406
407 return err;
408}
409
410unsigned long cmos_regs;
411EXPORT_SYMBOL(cmos_regs);
412
413static struct resource rtc_cmos_resource;
414
415static struct platform_device rtc_cmos_device = {
416 .name = "rtc_cmos",
417 .id = -1,
418 .resource = &rtc_cmos_resource,
419 .num_resources = 1,
420};
421
422static int __devinit rtc_probe(struct platform_device *op)
423{
424 struct resource *r;
425
426 printk(KERN_INFO "%s: RTC regs at 0x%llx\n",
427 op->dev.of_node->full_name, op->resource[0].start);
428
429 /* The CMOS RTC driver only accepts IORESOURCE_IO, so cons
430 * up a fake resource so that the probe works for all cases.
431 * When the RTC is behind an ISA bus it will have IORESOURCE_IO
432 * already, whereas when it's behind EBUS is will be IORESOURCE_MEM.
433 */
434
435 r = &rtc_cmos_resource;
436 r->flags = IORESOURCE_IO;
437 r->name = op->resource[0].name;
438 r->start = op->resource[0].start;
439 r->end = op->resource[0].end;
440
441 cmos_regs = op->resource[0].start;
442 return platform_device_register(&rtc_cmos_device);
443}
444
445static const struct of_device_id rtc_match[] = {
446 {
447 .name = "rtc",
448 .compatible = "m5819",
449 },
450 {
451 .name = "rtc",
452 .compatible = "isa-m5819p",
453 },
454 {
455 .name = "rtc",
456 .compatible = "isa-m5823p",
457 },
458 {
459 .name = "rtc",
460 .compatible = "ds1287",
461 },
462 {},
463};
464
465static struct platform_driver rtc_driver = {
466 .probe = rtc_probe,
467 .driver = {
468 .name = "rtc",
469 .owner = THIS_MODULE,
470 .of_match_table = rtc_match,
471 },
472};
473
474static struct platform_device rtc_bq4802_device = {
475 .name = "rtc-bq4802",
476 .id = -1,
477 .num_resources = 1,
478};
479
480static int __devinit bq4802_probe(struct platform_device *op)
481{
482
483 printk(KERN_INFO "%s: BQ4802 regs at 0x%llx\n",
484 op->dev.of_node->full_name, op->resource[0].start);
485
486 rtc_bq4802_device.resource = &op->resource[0];
487 return platform_device_register(&rtc_bq4802_device);
488}
489
490static const struct of_device_id bq4802_match[] = {
491 {
492 .name = "rtc",
493 .compatible = "bq4802",
494 },
495 {},
496};
497
498static struct platform_driver bq4802_driver = {
499 .probe = bq4802_probe,
500 .driver = {
501 .name = "bq4802",
502 .owner = THIS_MODULE,
503 .of_match_table = bq4802_match,
504 },
505};
506
507static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
508{
509 struct platform_device *pdev = to_platform_device(dev);
510 void __iomem *regs = (void __iomem *) pdev->resource[0].start;
511
512 return readb(regs + ofs);
513}
514
515static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
516{
517 struct platform_device *pdev = to_platform_device(dev);
518 void __iomem *regs = (void __iomem *) pdev->resource[0].start;
519
520 writeb(val, regs + ofs);
521}
522
523static struct m48t59_plat_data m48t59_data = {
524 .read_byte = mostek_read_byte,
525 .write_byte = mostek_write_byte,
526};
527
528static struct platform_device m48t59_rtc = {
529 .name = "rtc-m48t59",
530 .id = 0,
531 .num_resources = 1,
532 .dev = {
533 .platform_data = &m48t59_data,
534 },
535};
536
537static int __devinit mostek_probe(struct platform_device *op)
538{
539 struct device_node *dp = op->dev.of_node;
540
541 /* On an Enterprise system there can be multiple mostek clocks.
542 * We should only match the one that is on the central FHC bus.
543 */
544 if (!strcmp(dp->parent->name, "fhc") &&
545 strcmp(dp->parent->parent->name, "central") != 0)
546 return -ENODEV;
547
548 printk(KERN_INFO "%s: Mostek regs at 0x%llx\n",
549 dp->full_name, op->resource[0].start);
550
551 m48t59_rtc.resource = &op->resource[0];
552 return platform_device_register(&m48t59_rtc);
553}
554
555static const struct of_device_id mostek_match[] = {
556 {
557 .name = "eeprom",
558 },
559 {},
560};
561
562static struct platform_driver mostek_driver = {
563 .probe = mostek_probe,
564 .driver = {
565 .name = "mostek",
566 .owner = THIS_MODULE,
567 .of_match_table = mostek_match,
568 },
569};
570
571static struct platform_device rtc_sun4v_device = {
572 .name = "rtc-sun4v",
573 .id = -1,
574};
575
576static struct platform_device rtc_starfire_device = {
577 .name = "rtc-starfire",
578 .id = -1,
579};
580
581static int __init clock_init(void)
582{
583 if (this_is_starfire)
584 return platform_device_register(&rtc_starfire_device);
585
586 if (tlb_type == hypervisor)
587 return platform_device_register(&rtc_sun4v_device);
588
589 (void) platform_driver_register(&rtc_driver);
590 (void) platform_driver_register(&mostek_driver);
591 (void) platform_driver_register(&bq4802_driver);
592
593 return 0;
594}
595
596/* Must be after subsys_initcall() so that busses are probed. Must
597 * be before device_initcall() because things like the RTC driver
598 * need to see the clock registers.
599 */
600fs_initcall(clock_init);
601
602/* This is gets the master TICK_INT timer going. */
603static unsigned long sparc64_init_timers(void)
604{
605 struct device_node *dp;
606 unsigned long freq;
607
608 dp = of_find_node_by_path("/");
609 if (tlb_type == spitfire) {
610 unsigned long ver, manuf, impl;
611
612 __asm__ __volatile__ ("rdpr %%ver, %0"
613 : "=&r" (ver));
614 manuf = ((ver >> 48) & 0xffff);
615 impl = ((ver >> 32) & 0xffff);
616 if (manuf == 0x17 && impl == 0x13) {
617 /* Hummingbird, aka Ultra-IIe */
618 tick_ops = &hbtick_operations;
619 freq = of_getintprop_default(dp, "stick-frequency", 0);
620 } else {
621 tick_ops = &tick_operations;
622 freq = local_cpu_data().clock_tick;
623 }
624 } else {
625 tick_ops = &stick_operations;
626 freq = of_getintprop_default(dp, "stick-frequency", 0);
627 }
628
629 return freq;
630}
631
632struct freq_table {
633 unsigned long clock_tick_ref;
634 unsigned int ref_freq;
635};
636static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
637
638unsigned long sparc64_get_clock_tick(unsigned int cpu)
639{
640 struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
641
642 if (ft->clock_tick_ref)
643 return ft->clock_tick_ref;
644 return cpu_data(cpu).clock_tick;
645}
646EXPORT_SYMBOL(sparc64_get_clock_tick);
647
648#ifdef CONFIG_CPU_FREQ
649
650static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
651 void *data)
652{
653 struct cpufreq_freqs *freq = data;
654 unsigned int cpu = freq->cpu;
655 struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
656
657 if (!ft->ref_freq) {
658 ft->ref_freq = freq->old;
659 ft->clock_tick_ref = cpu_data(cpu).clock_tick;
660 }
661 if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) ||
662 (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
663 (val == CPUFREQ_RESUMECHANGE)) {
664 cpu_data(cpu).clock_tick =
665 cpufreq_scale(ft->clock_tick_ref,
666 ft->ref_freq,
667 freq->new);
668 }
669
670 return 0;
671}
672
673static struct notifier_block sparc64_cpufreq_notifier_block = {
674 .notifier_call = sparc64_cpufreq_notifier
675};
676
677static int __init register_sparc64_cpufreq_notifier(void)
678{
679
680 cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
681 CPUFREQ_TRANSITION_NOTIFIER);
682 return 0;
683}
684
685core_initcall(register_sparc64_cpufreq_notifier);
686
687#endif /* CONFIG_CPU_FREQ */
688
689static int sparc64_next_event(unsigned long delta,
690 struct clock_event_device *evt)
691{
692 return tick_ops->add_compare(delta) ? -ETIME : 0;
693}
694
695static void sparc64_timer_setup(enum clock_event_mode mode,
696 struct clock_event_device *evt)
697{
698 switch (mode) {
699 case CLOCK_EVT_MODE_ONESHOT:
700 case CLOCK_EVT_MODE_RESUME:
701 break;
702
703 case CLOCK_EVT_MODE_SHUTDOWN:
704 tick_ops->disable_irq();
705 break;
706
707 case CLOCK_EVT_MODE_PERIODIC:
708 case CLOCK_EVT_MODE_UNUSED:
709 WARN_ON(1);
710 break;
711 }
712}
713
714static struct clock_event_device sparc64_clockevent = {
715 .features = CLOCK_EVT_FEAT_ONESHOT,
716 .set_mode = sparc64_timer_setup,
717 .set_next_event = sparc64_next_event,
718 .rating = 100,
719 .shift = 30,
720 .irq = -1,
721};
722static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
723
724void __irq_entry timer_interrupt(int irq, struct pt_regs *regs)
725{
726 struct pt_regs *old_regs = set_irq_regs(regs);
727 unsigned long tick_mask = tick_ops->softint_mask;
728 int cpu = smp_processor_id();
729 struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
730
731 clear_softint(tick_mask);
732
733 irq_enter();
734
735 local_cpu_data().irq0_irqs++;
736 kstat_incr_irqs_this_cpu(0, irq_to_desc(0));
737
738 if (unlikely(!evt->event_handler)) {
739 printk(KERN_WARNING
740 "Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
741 } else
742 evt->event_handler(evt);
743
744 irq_exit();
745
746 set_irq_regs(old_regs);
747}
748
749void __devinit setup_sparc64_timer(void)
750{
751 struct clock_event_device *sevt;
752 unsigned long pstate;
753
754 /* Guarantee that the following sequences execute
755 * uninterrupted.
756 */
757 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
758 "wrpr %0, %1, %%pstate"
759 : "=r" (pstate)
760 : "i" (PSTATE_IE));
761
762 tick_ops->init_tick();
763
764 /* Restore PSTATE_IE. */
765 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
766 : /* no outputs */
767 : "r" (pstate));
768
769 sevt = &__get_cpu_var(sparc64_events);
770
771 memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
772 sevt->cpumask = cpumask_of(smp_processor_id());
773
774 clockevents_register_device(sevt);
775}
776
777#define SPARC64_NSEC_PER_CYC_SHIFT 10UL
778
779static struct clocksource clocksource_tick = {
780 .rating = 100,
781 .mask = CLOCKSOURCE_MASK(64),
782 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
783};
784
785static unsigned long tb_ticks_per_usec __read_mostly;
786
787void __delay(unsigned long loops)
788{
789 unsigned long bclock, now;
790
791 bclock = tick_ops->get_tick();
792 do {
793 now = tick_ops->get_tick();
794 } while ((now-bclock) < loops);
795}
796EXPORT_SYMBOL(__delay);
797
798void udelay(unsigned long usecs)
799{
800 __delay(tb_ticks_per_usec * usecs);
801}
802EXPORT_SYMBOL(udelay);
803
804static cycle_t clocksource_tick_read(struct clocksource *cs)
805{
806 return tick_ops->get_tick();
807}
808
809void __init time_init(void)
810{
811 unsigned long freq = sparc64_init_timers();
812
813 tb_ticks_per_usec = freq / USEC_PER_SEC;
814
815 timer_ticks_per_nsec_quotient =
816 clocksource_hz2mult(freq, SPARC64_NSEC_PER_CYC_SHIFT);
817
818 clocksource_tick.name = tick_ops->name;
819 clocksource_tick.read = clocksource_tick_read;
820
821 clocksource_register_hz(&clocksource_tick, freq);
822 printk("clocksource: mult[%x] shift[%d]\n",
823 clocksource_tick.mult, clocksource_tick.shift);
824
825 sparc64_clockevent.name = tick_ops->name;
826 clockevents_calc_mult_shift(&sparc64_clockevent, freq, 4);
827
828 sparc64_clockevent.max_delta_ns =
829 clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent);
830 sparc64_clockevent.min_delta_ns =
831 clockevent_delta2ns(0xF, &sparc64_clockevent);
832
833 printk("clockevent: mult[%x] shift[%d]\n",
834 sparc64_clockevent.mult, sparc64_clockevent.shift);
835
836 setup_sparc64_timer();
837}
838
839unsigned long long sched_clock(void)
840{
841 unsigned long ticks = tick_ops->get_tick();
842
843 return (ticks * timer_ticks_per_nsec_quotient)
844 >> SPARC64_NSEC_PER_CYC_SHIFT;
845}
846
847int __devinit read_current_timer(unsigned long *timer_val)
848{
849 *timer_val = tick_ops->get_tick();
850 return 0;
851}
1// SPDX-License-Identifier: GPL-2.0
2/* time.c: UltraSparc timer and TOD clock support.
3 *
4 * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
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/errno.h>
13#include <linux/export.h>
14#include <linux/sched.h>
15#include <linux/kernel.h>
16#include <linux/param.h>
17#include <linux/string.h>
18#include <linux/mm.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/rtc/m48t59.h>
32#include <linux/kernel_stat.h>
33#include <linux/clockchips.h>
34#include <linux/clocksource.h>
35#include <linux/platform_device.h>
36#include <linux/ftrace.h>
37
38#include <asm/oplib.h>
39#include <asm/timer.h>
40#include <asm/irq.h>
41#include <asm/io.h>
42#include <asm/prom.h>
43#include <asm/starfire.h>
44#include <asm/smp.h>
45#include <asm/sections.h>
46#include <asm/cpudata.h>
47#include <linux/uaccess.h>
48#include <asm/irq_regs.h>
49#include <asm/cacheflush.h>
50
51#include "entry.h"
52#include "kernel.h"
53
54DEFINE_SPINLOCK(rtc_lock);
55
56#ifdef CONFIG_SMP
57unsigned long profile_pc(struct pt_regs *regs)
58{
59 unsigned long pc = instruction_pointer(regs);
60
61 if (in_lock_functions(pc))
62 return regs->u_regs[UREG_RETPC];
63 return pc;
64}
65EXPORT_SYMBOL(profile_pc);
66#endif
67
68static void tick_disable_protection(void)
69{
70 /* Set things up so user can access tick register for profiling
71 * purposes. Also workaround BB_ERRATA_1 by doing a dummy
72 * read back of %tick after writing it.
73 */
74 __asm__ __volatile__(
75 " ba,pt %%xcc, 1f\n"
76 " nop\n"
77 " .align 64\n"
78 "1: rd %%tick, %%g2\n"
79 " add %%g2, 6, %%g2\n"
80 " andn %%g2, %0, %%g2\n"
81 " wrpr %%g2, 0, %%tick\n"
82 " rdpr %%tick, %%g0"
83 : /* no outputs */
84 : "r" (TICK_PRIV_BIT)
85 : "g2");
86}
87
88static void tick_disable_irq(void)
89{
90 __asm__ __volatile__(
91 " ba,pt %%xcc, 1f\n"
92 " nop\n"
93 " .align 64\n"
94 "1: wr %0, 0x0, %%tick_cmpr\n"
95 " rd %%tick_cmpr, %%g0"
96 : /* no outputs */
97 : "r" (TICKCMP_IRQ_BIT));
98}
99
100static void tick_init_tick(void)
101{
102 tick_disable_protection();
103 tick_disable_irq();
104}
105
106static unsigned long long tick_get_tick(void)
107{
108 unsigned long ret;
109
110 __asm__ __volatile__("rd %%tick, %0\n\t"
111 "mov %0, %0"
112 : "=r" (ret));
113
114 return ret & ~TICK_PRIV_BIT;
115}
116
117static int tick_add_compare(unsigned long adj)
118{
119 unsigned long orig_tick, new_tick, new_compare;
120
121 __asm__ __volatile__("rd %%tick, %0"
122 : "=r" (orig_tick));
123
124 orig_tick &= ~TICKCMP_IRQ_BIT;
125
126 /* Workaround for Spitfire Errata (#54 I think??), I discovered
127 * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
128 * number 103640.
129 *
130 * On Blackbird writes to %tick_cmpr can fail, the
131 * workaround seems to be to execute the wr instruction
132 * at the start of an I-cache line, and perform a dummy
133 * read back from %tick_cmpr right after writing to it. -DaveM
134 */
135 __asm__ __volatile__("ba,pt %%xcc, 1f\n\t"
136 " add %1, %2, %0\n\t"
137 ".align 64\n"
138 "1:\n\t"
139 "wr %0, 0, %%tick_cmpr\n\t"
140 "rd %%tick_cmpr, %%g0\n\t"
141 : "=r" (new_compare)
142 : "r" (orig_tick), "r" (adj));
143
144 __asm__ __volatile__("rd %%tick, %0"
145 : "=r" (new_tick));
146 new_tick &= ~TICKCMP_IRQ_BIT;
147
148 return ((long)(new_tick - (orig_tick+adj))) > 0L;
149}
150
151static unsigned long tick_add_tick(unsigned long adj)
152{
153 unsigned long new_tick;
154
155 /* Also need to handle Blackbird bug here too. */
156 __asm__ __volatile__("rd %%tick, %0\n\t"
157 "add %0, %1, %0\n\t"
158 "wrpr %0, 0, %%tick\n\t"
159 : "=&r" (new_tick)
160 : "r" (adj));
161
162 return new_tick;
163}
164
165/* Searches for cpu clock frequency with given cpuid in OpenBoot tree */
166static unsigned long cpuid_to_freq(phandle node, int cpuid)
167{
168 bool is_cpu_node = false;
169 unsigned long freq = 0;
170 char type[128];
171
172 if (!node)
173 return freq;
174
175 if (prom_getproperty(node, "device_type", type, sizeof(type)) != -1)
176 is_cpu_node = (strcmp(type, "cpu") == 0);
177
178 /* try upa-portid then cpuid to get cpuid, see prom_64.c */
179 if (is_cpu_node && (prom_getint(node, "upa-portid") == cpuid ||
180 prom_getint(node, "cpuid") == cpuid))
181 freq = prom_getintdefault(node, "clock-frequency", 0);
182 if (!freq)
183 freq = cpuid_to_freq(prom_getchild(node), cpuid);
184 if (!freq)
185 freq = cpuid_to_freq(prom_getsibling(node), cpuid);
186
187 return freq;
188}
189
190static unsigned long tick_get_frequency(void)
191{
192 return cpuid_to_freq(prom_root_node, hard_smp_processor_id());
193}
194
195static struct sparc64_tick_ops tick_operations __cacheline_aligned = {
196 .name = "tick",
197 .init_tick = tick_init_tick,
198 .disable_irq = tick_disable_irq,
199 .get_tick = tick_get_tick,
200 .add_tick = tick_add_tick,
201 .add_compare = tick_add_compare,
202 .get_frequency = tick_get_frequency,
203 .softint_mask = 1UL << 0,
204};
205
206struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
207EXPORT_SYMBOL(tick_ops);
208
209static void stick_disable_irq(void)
210{
211 __asm__ __volatile__(
212 "wr %0, 0x0, %%asr25"
213 : /* no outputs */
214 : "r" (TICKCMP_IRQ_BIT));
215}
216
217static void stick_init_tick(void)
218{
219 /* Writes to the %tick and %stick register are not
220 * allowed on sun4v. The Hypervisor controls that
221 * bit, per-strand.
222 */
223 if (tlb_type != hypervisor) {
224 tick_disable_protection();
225 tick_disable_irq();
226
227 /* Let the user get at STICK too. */
228 __asm__ __volatile__(
229 " rd %%asr24, %%g2\n"
230 " andn %%g2, %0, %%g2\n"
231 " wr %%g2, 0, %%asr24"
232 : /* no outputs */
233 : "r" (TICK_PRIV_BIT)
234 : "g1", "g2");
235 }
236
237 stick_disable_irq();
238}
239
240static unsigned long long stick_get_tick(void)
241{
242 unsigned long ret;
243
244 __asm__ __volatile__("rd %%asr24, %0"
245 : "=r" (ret));
246
247 return ret & ~TICK_PRIV_BIT;
248}
249
250static unsigned long stick_add_tick(unsigned long adj)
251{
252 unsigned long new_tick;
253
254 __asm__ __volatile__("rd %%asr24, %0\n\t"
255 "add %0, %1, %0\n\t"
256 "wr %0, 0, %%asr24\n\t"
257 : "=&r" (new_tick)
258 : "r" (adj));
259
260 return new_tick;
261}
262
263static int stick_add_compare(unsigned long adj)
264{
265 unsigned long orig_tick, new_tick;
266
267 __asm__ __volatile__("rd %%asr24, %0"
268 : "=r" (orig_tick));
269 orig_tick &= ~TICKCMP_IRQ_BIT;
270
271 __asm__ __volatile__("wr %0, 0, %%asr25"
272 : /* no outputs */
273 : "r" (orig_tick + adj));
274
275 __asm__ __volatile__("rd %%asr24, %0"
276 : "=r" (new_tick));
277 new_tick &= ~TICKCMP_IRQ_BIT;
278
279 return ((long)(new_tick - (orig_tick+adj))) > 0L;
280}
281
282static unsigned long stick_get_frequency(void)
283{
284 return prom_getintdefault(prom_root_node, "stick-frequency", 0);
285}
286
287static struct sparc64_tick_ops stick_operations __read_mostly = {
288 .name = "stick",
289 .init_tick = stick_init_tick,
290 .disable_irq = stick_disable_irq,
291 .get_tick = stick_get_tick,
292 .add_tick = stick_add_tick,
293 .add_compare = stick_add_compare,
294 .get_frequency = stick_get_frequency,
295 .softint_mask = 1UL << 16,
296};
297
298/* On Hummingbird the STICK/STICK_CMPR register is implemented
299 * in I/O space. There are two 64-bit registers each, the
300 * first holds the low 32-bits of the value and the second holds
301 * the high 32-bits.
302 *
303 * Since STICK is constantly updating, we have to access it carefully.
304 *
305 * The sequence we use to read is:
306 * 1) read high
307 * 2) read low
308 * 3) read high again, if it rolled re-read both low and high again.
309 *
310 * Writing STICK safely is also tricky:
311 * 1) write low to zero
312 * 2) write high
313 * 3) write low
314 */
315static unsigned long __hbird_read_stick(void)
316{
317 unsigned long ret, tmp1, tmp2, tmp3;
318 unsigned long addr = HBIRD_STICK_ADDR+8;
319
320 __asm__ __volatile__("ldxa [%1] %5, %2\n"
321 "1:\n\t"
322 "sub %1, 0x8, %1\n\t"
323 "ldxa [%1] %5, %3\n\t"
324 "add %1, 0x8, %1\n\t"
325 "ldxa [%1] %5, %4\n\t"
326 "cmp %4, %2\n\t"
327 "bne,a,pn %%xcc, 1b\n\t"
328 " mov %4, %2\n\t"
329 "sllx %4, 32, %4\n\t"
330 "or %3, %4, %0\n\t"
331 : "=&r" (ret), "=&r" (addr),
332 "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
333 : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
334
335 return ret;
336}
337
338static void __hbird_write_stick(unsigned long val)
339{
340 unsigned long low = (val & 0xffffffffUL);
341 unsigned long high = (val >> 32UL);
342 unsigned long addr = HBIRD_STICK_ADDR;
343
344 __asm__ __volatile__("stxa %%g0, [%0] %4\n\t"
345 "add %0, 0x8, %0\n\t"
346 "stxa %3, [%0] %4\n\t"
347 "sub %0, 0x8, %0\n\t"
348 "stxa %2, [%0] %4"
349 : "=&r" (addr)
350 : "0" (addr), "r" (low), "r" (high),
351 "i" (ASI_PHYS_BYPASS_EC_E));
352}
353
354static void __hbird_write_compare(unsigned long val)
355{
356 unsigned long low = (val & 0xffffffffUL);
357 unsigned long high = (val >> 32UL);
358 unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
359
360 __asm__ __volatile__("stxa %3, [%0] %4\n\t"
361 "sub %0, 0x8, %0\n\t"
362 "stxa %2, [%0] %4"
363 : "=&r" (addr)
364 : "0" (addr), "r" (low), "r" (high),
365 "i" (ASI_PHYS_BYPASS_EC_E));
366}
367
368static void hbtick_disable_irq(void)
369{
370 __hbird_write_compare(TICKCMP_IRQ_BIT);
371}
372
373static void hbtick_init_tick(void)
374{
375 tick_disable_protection();
376
377 /* XXX This seems to be necessary to 'jumpstart' Hummingbird
378 * XXX into actually sending STICK interrupts. I think because
379 * XXX of how we store %tick_cmpr in head.S this somehow resets the
380 * XXX {TICK + STICK} interrupt mux. -DaveM
381 */
382 __hbird_write_stick(__hbird_read_stick());
383
384 hbtick_disable_irq();
385}
386
387static unsigned long long hbtick_get_tick(void)
388{
389 return __hbird_read_stick() & ~TICK_PRIV_BIT;
390}
391
392static unsigned long hbtick_add_tick(unsigned long adj)
393{
394 unsigned long val;
395
396 val = __hbird_read_stick() + adj;
397 __hbird_write_stick(val);
398
399 return val;
400}
401
402static int hbtick_add_compare(unsigned long adj)
403{
404 unsigned long val = __hbird_read_stick();
405 unsigned long val2;
406
407 val &= ~TICKCMP_IRQ_BIT;
408 val += adj;
409 __hbird_write_compare(val);
410
411 val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
412
413 return ((long)(val2 - val)) > 0L;
414}
415
416static unsigned long hbtick_get_frequency(void)
417{
418 return prom_getintdefault(prom_root_node, "stick-frequency", 0);
419}
420
421static struct sparc64_tick_ops hbtick_operations __read_mostly = {
422 .name = "hbtick",
423 .init_tick = hbtick_init_tick,
424 .disable_irq = hbtick_disable_irq,
425 .get_tick = hbtick_get_tick,
426 .add_tick = hbtick_add_tick,
427 .add_compare = hbtick_add_compare,
428 .get_frequency = hbtick_get_frequency,
429 .softint_mask = 1UL << 0,
430};
431
432unsigned long cmos_regs;
433EXPORT_SYMBOL(cmos_regs);
434
435static struct resource rtc_cmos_resource;
436
437static struct platform_device rtc_cmos_device = {
438 .name = "rtc_cmos",
439 .id = -1,
440 .resource = &rtc_cmos_resource,
441 .num_resources = 1,
442};
443
444static int rtc_probe(struct platform_device *op)
445{
446 struct resource *r;
447
448 printk(KERN_INFO "%pOF: RTC regs at 0x%llx\n",
449 op->dev.of_node, op->resource[0].start);
450
451 /* The CMOS RTC driver only accepts IORESOURCE_IO, so cons
452 * up a fake resource so that the probe works for all cases.
453 * When the RTC is behind an ISA bus it will have IORESOURCE_IO
454 * already, whereas when it's behind EBUS is will be IORESOURCE_MEM.
455 */
456
457 r = &rtc_cmos_resource;
458 r->flags = IORESOURCE_IO;
459 r->name = op->resource[0].name;
460 r->start = op->resource[0].start;
461 r->end = op->resource[0].end;
462
463 cmos_regs = op->resource[0].start;
464 return platform_device_register(&rtc_cmos_device);
465}
466
467static const struct of_device_id rtc_match[] = {
468 {
469 .name = "rtc",
470 .compatible = "m5819",
471 },
472 {
473 .name = "rtc",
474 .compatible = "isa-m5819p",
475 },
476 {
477 .name = "rtc",
478 .compatible = "isa-m5823p",
479 },
480 {
481 .name = "rtc",
482 .compatible = "ds1287",
483 },
484 {},
485};
486
487static struct platform_driver rtc_driver = {
488 .probe = rtc_probe,
489 .driver = {
490 .name = "rtc",
491 .of_match_table = rtc_match,
492 },
493};
494
495static struct platform_device rtc_bq4802_device = {
496 .name = "rtc-bq4802",
497 .id = -1,
498 .num_resources = 1,
499};
500
501static int bq4802_probe(struct platform_device *op)
502{
503
504 printk(KERN_INFO "%pOF: BQ4802 regs at 0x%llx\n",
505 op->dev.of_node, op->resource[0].start);
506
507 rtc_bq4802_device.resource = &op->resource[0];
508 return platform_device_register(&rtc_bq4802_device);
509}
510
511static const struct of_device_id bq4802_match[] = {
512 {
513 .name = "rtc",
514 .compatible = "bq4802",
515 },
516 {},
517};
518
519static struct platform_driver bq4802_driver = {
520 .probe = bq4802_probe,
521 .driver = {
522 .name = "bq4802",
523 .of_match_table = bq4802_match,
524 },
525};
526
527static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
528{
529 struct platform_device *pdev = to_platform_device(dev);
530 void __iomem *regs = (void __iomem *) pdev->resource[0].start;
531
532 return readb(regs + ofs);
533}
534
535static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
536{
537 struct platform_device *pdev = to_platform_device(dev);
538 void __iomem *regs = (void __iomem *) pdev->resource[0].start;
539
540 writeb(val, regs + ofs);
541}
542
543static struct m48t59_plat_data m48t59_data = {
544 .read_byte = mostek_read_byte,
545 .write_byte = mostek_write_byte,
546};
547
548static struct platform_device m48t59_rtc = {
549 .name = "rtc-m48t59",
550 .id = 0,
551 .num_resources = 1,
552 .dev = {
553 .platform_data = &m48t59_data,
554 },
555};
556
557static int mostek_probe(struct platform_device *op)
558{
559 struct device_node *dp = op->dev.of_node;
560
561 /* On an Enterprise system there can be multiple mostek clocks.
562 * We should only match the one that is on the central FHC bus.
563 */
564 if (of_node_name_eq(dp->parent, "fhc") &&
565 !of_node_name_eq(dp->parent->parent, "central"))
566 return -ENODEV;
567
568 printk(KERN_INFO "%pOF: Mostek regs at 0x%llx\n",
569 dp, op->resource[0].start);
570
571 m48t59_rtc.resource = &op->resource[0];
572 return platform_device_register(&m48t59_rtc);
573}
574
575static const struct of_device_id mostek_match[] = {
576 {
577 .name = "eeprom",
578 },
579 {},
580};
581
582static struct platform_driver mostek_driver = {
583 .probe = mostek_probe,
584 .driver = {
585 .name = "mostek",
586 .of_match_table = mostek_match,
587 },
588};
589
590static struct platform_device rtc_sun4v_device = {
591 .name = "rtc-sun4v",
592 .id = -1,
593};
594
595static struct platform_device rtc_starfire_device = {
596 .name = "rtc-starfire",
597 .id = -1,
598};
599
600static int __init clock_init(void)
601{
602 if (this_is_starfire)
603 return platform_device_register(&rtc_starfire_device);
604
605 if (tlb_type == hypervisor)
606 return platform_device_register(&rtc_sun4v_device);
607
608 (void) platform_driver_register(&rtc_driver);
609 (void) platform_driver_register(&mostek_driver);
610 (void) platform_driver_register(&bq4802_driver);
611
612 return 0;
613}
614
615/* Must be after subsys_initcall() so that busses are probed. Must
616 * be before device_initcall() because things like the RTC driver
617 * need to see the clock registers.
618 */
619fs_initcall(clock_init);
620
621/* Return true if this is Hummingbird, aka Ultra-IIe */
622static bool is_hummingbird(void)
623{
624 unsigned long ver, manuf, impl;
625
626 __asm__ __volatile__ ("rdpr %%ver, %0"
627 : "=&r" (ver));
628 manuf = ((ver >> 48) & 0xffff);
629 impl = ((ver >> 32) & 0xffff);
630
631 return (manuf == 0x17 && impl == 0x13);
632}
633
634struct freq_table {
635 unsigned long clock_tick_ref;
636 unsigned int ref_freq;
637};
638static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
639
640unsigned long sparc64_get_clock_tick(unsigned int cpu)
641{
642 struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
643
644 if (ft->clock_tick_ref)
645 return ft->clock_tick_ref;
646 return cpu_data(cpu).clock_tick;
647}
648EXPORT_SYMBOL(sparc64_get_clock_tick);
649
650#ifdef CONFIG_CPU_FREQ
651
652static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
653 void *data)
654{
655 struct cpufreq_freqs *freq = data;
656 unsigned int cpu;
657 struct freq_table *ft;
658
659 for_each_cpu(cpu, freq->policy->cpus) {
660 ft = &per_cpu(sparc64_freq_table, cpu);
661
662 if (!ft->ref_freq) {
663 ft->ref_freq = freq->old;
664 ft->clock_tick_ref = cpu_data(cpu).clock_tick;
665 }
666
667 if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) ||
668 (val == CPUFREQ_POSTCHANGE && freq->old > freq->new)) {
669 cpu_data(cpu).clock_tick =
670 cpufreq_scale(ft->clock_tick_ref, ft->ref_freq,
671 freq->new);
672 }
673 }
674
675 return 0;
676}
677
678static struct notifier_block sparc64_cpufreq_notifier_block = {
679 .notifier_call = sparc64_cpufreq_notifier
680};
681
682static int __init register_sparc64_cpufreq_notifier(void)
683{
684
685 cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
686 CPUFREQ_TRANSITION_NOTIFIER);
687 return 0;
688}
689
690core_initcall(register_sparc64_cpufreq_notifier);
691
692#endif /* CONFIG_CPU_FREQ */
693
694static int sparc64_next_event(unsigned long delta,
695 struct clock_event_device *evt)
696{
697 return tick_operations.add_compare(delta) ? -ETIME : 0;
698}
699
700static int sparc64_timer_shutdown(struct clock_event_device *evt)
701{
702 tick_operations.disable_irq();
703 return 0;
704}
705
706static struct clock_event_device sparc64_clockevent = {
707 .features = CLOCK_EVT_FEAT_ONESHOT,
708 .set_state_shutdown = sparc64_timer_shutdown,
709 .set_next_event = sparc64_next_event,
710 .rating = 100,
711 .shift = 30,
712 .irq = -1,
713};
714static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
715
716void __irq_entry timer_interrupt(int irq, struct pt_regs *regs)
717{
718 struct pt_regs *old_regs = set_irq_regs(regs);
719 unsigned long tick_mask = tick_operations.softint_mask;
720 int cpu = smp_processor_id();
721 struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
722
723 clear_softint(tick_mask);
724
725 irq_enter();
726
727 local_cpu_data().irq0_irqs++;
728 kstat_incr_irq_this_cpu(0);
729
730 if (unlikely(!evt->event_handler)) {
731 printk(KERN_WARNING
732 "Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
733 } else
734 evt->event_handler(evt);
735
736 irq_exit();
737
738 set_irq_regs(old_regs);
739}
740
741void setup_sparc64_timer(void)
742{
743 struct clock_event_device *sevt;
744 unsigned long pstate;
745
746 /* Guarantee that the following sequences execute
747 * uninterrupted.
748 */
749 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
750 "wrpr %0, %1, %%pstate"
751 : "=r" (pstate)
752 : "i" (PSTATE_IE));
753
754 tick_operations.init_tick();
755
756 /* Restore PSTATE_IE. */
757 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
758 : /* no outputs */
759 : "r" (pstate));
760
761 sevt = this_cpu_ptr(&sparc64_events);
762
763 memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
764 sevt->cpumask = cpumask_of(smp_processor_id());
765
766 clockevents_register_device(sevt);
767}
768
769#define SPARC64_NSEC_PER_CYC_SHIFT 10UL
770
771static struct clocksource clocksource_tick = {
772 .rating = 100,
773 .mask = CLOCKSOURCE_MASK(64),
774 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
775};
776
777static unsigned long tb_ticks_per_usec __read_mostly;
778
779void __delay(unsigned long loops)
780{
781 unsigned long bclock = get_tick();
782
783 while ((get_tick() - bclock) < loops)
784 ;
785}
786EXPORT_SYMBOL(__delay);
787
788void udelay(unsigned long usecs)
789{
790 __delay(tb_ticks_per_usec * usecs);
791}
792EXPORT_SYMBOL(udelay);
793
794static u64 clocksource_tick_read(struct clocksource *cs)
795{
796 return get_tick();
797}
798
799static void __init get_tick_patch(void)
800{
801 unsigned int *addr, *instr, i;
802 struct get_tick_patch *p;
803
804 if (tlb_type == spitfire && is_hummingbird())
805 return;
806
807 for (p = &__get_tick_patch; p < &__get_tick_patch_end; p++) {
808 instr = (tlb_type == spitfire) ? p->tick : p->stick;
809 addr = (unsigned int *)(unsigned long)p->addr;
810 for (i = 0; i < GET_TICK_NINSTR; i++) {
811 addr[i] = instr[i];
812 /* ensure that address is modified before flush */
813 wmb();
814 flushi(&addr[i]);
815 }
816 }
817}
818
819static void __init init_tick_ops(struct sparc64_tick_ops *ops)
820{
821 unsigned long freq, quotient, tick;
822
823 freq = ops->get_frequency();
824 quotient = clocksource_hz2mult(freq, SPARC64_NSEC_PER_CYC_SHIFT);
825 tick = ops->get_tick();
826
827 ops->offset = (tick * quotient) >> SPARC64_NSEC_PER_CYC_SHIFT;
828 ops->ticks_per_nsec_quotient = quotient;
829 ops->frequency = freq;
830 tick_operations = *ops;
831 get_tick_patch();
832}
833
834void __init time_init_early(void)
835{
836 if (tlb_type == spitfire) {
837 if (is_hummingbird()) {
838 init_tick_ops(&hbtick_operations);
839 clocksource_tick.archdata.vclock_mode = VCLOCK_NONE;
840 } else {
841 init_tick_ops(&tick_operations);
842 clocksource_tick.archdata.vclock_mode = VCLOCK_TICK;
843 }
844 } else {
845 init_tick_ops(&stick_operations);
846 clocksource_tick.archdata.vclock_mode = VCLOCK_STICK;
847 }
848}
849
850void __init time_init(void)
851{
852 unsigned long freq;
853
854 freq = tick_operations.frequency;
855 tb_ticks_per_usec = freq / USEC_PER_SEC;
856
857 clocksource_tick.name = tick_operations.name;
858 clocksource_tick.read = clocksource_tick_read;
859
860 clocksource_register_hz(&clocksource_tick, freq);
861 printk("clocksource: mult[%x] shift[%d]\n",
862 clocksource_tick.mult, clocksource_tick.shift);
863
864 sparc64_clockevent.name = tick_operations.name;
865 clockevents_calc_mult_shift(&sparc64_clockevent, freq, 4);
866
867 sparc64_clockevent.max_delta_ns =
868 clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent);
869 sparc64_clockevent.max_delta_ticks = 0x7fffffffffffffffUL;
870 sparc64_clockevent.min_delta_ns =
871 clockevent_delta2ns(0xF, &sparc64_clockevent);
872 sparc64_clockevent.min_delta_ticks = 0xF;
873
874 printk("clockevent: mult[%x] shift[%d]\n",
875 sparc64_clockevent.mult, sparc64_clockevent.shift);
876
877 setup_sparc64_timer();
878}
879
880unsigned long long sched_clock(void)
881{
882 unsigned long quotient = tick_operations.ticks_per_nsec_quotient;
883 unsigned long offset = tick_operations.offset;
884
885 /* Use barrier so the compiler emits the loads first and overlaps load
886 * latency with reading tick, because reading %tick/%stick is a
887 * post-sync instruction that will flush and restart subsequent
888 * instructions after it commits.
889 */
890 barrier();
891
892 return ((get_tick() * quotient) >> SPARC64_NSEC_PER_CYC_SHIFT) - offset;
893}
894
895int read_current_timer(unsigned long *timer_val)
896{
897 *timer_val = get_tick();
898 return 0;
899}