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David S. Miller64d329e2007-10-27 00:17:01 -07001/* linux/arch/sparc/kernel/time.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
David S. Miller64d329e2007-10-27 00:17:01 -07003 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
5 *
6 * Chris Davis (cdavis@cois.on.ca) 03/27/1998
7 * Added support for the intersil on the sun4/4200
8 *
9 * Gleb Raiko (rajko@mech.math.msu.su) 08/18/1998
10 * Support for MicroSPARC-IIep, PCI CPU.
11 *
12 * This file handles the Sparc specific time handling details.
13 *
14 * 1997-09-10 Updated NTP code according to technical memorandum Jan '96
15 * "A Kernel Model for Precision Timekeeping" by Dave Mills
16 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/errno.h>
18#include <linux/module.h>
19#include <linux/sched.h>
20#include <linux/kernel.h>
21#include <linux/param.h>
22#include <linux/string.h>
23#include <linux/mm.h>
24#include <linux/interrupt.h>
25#include <linux/time.h>
David S. Millerc4cbe6f2008-09-03 15:52:38 -070026#include <linux/rtc/m48t59.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/timex.h>
Tkhai Kirill62f08282012-04-04 21:49:26 +020028#include <linux/clocksource.h>
29#include <linux/clockchips.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/init.h>
31#include <linux/pci.h>
32#include <linux/ioport.h>
33#include <linux/profile.h>
David S. Miller454eeb22008-08-27 04:05:35 -070034#include <linux/of.h>
Stephen Rothwell764f2572008-08-07 15:33:36 -070035#include <linux/of_device.h>
David S. Millerc4cbe6f2008-09-03 15:52:38 -070036#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Sam Ravnborgfcea8b22014-05-16 23:25:44 +020038#include <asm/mc146818rtc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <asm/oplib.h>
John Stultz0299b132010-01-15 01:34:28 -080040#include <asm/timex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <asm/timer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <asm/irq.h>
43#include <asm/io.h>
44#include <asm/idprom.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <asm/page.h>
46#include <asm/pcic.h>
Al Viro0d844382006-10-08 14:30:44 +010047#include <asm/irq_regs.h>
Tkhai Kirill62f08282012-04-04 21:49:26 +020048#include <asm/setup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Sam Ravnborgfcea8b22014-05-16 23:25:44 +020050#include "kernel.h"
Al Viro32231a62007-07-21 19:18:57 -070051#include "irq.h"
52
Tkhai Kirill62f08282012-04-04 21:49:26 +020053static __cacheline_aligned_in_smp DEFINE_SEQLOCK(timer_cs_lock);
54static __volatile__ u64 timer_cs_internal_counter = 0;
55static char timer_cs_enabled = 0;
56
57static struct clock_event_device timer_ce;
58static char timer_ce_enabled = 0;
59
60#ifdef CONFIG_SMP
61DEFINE_PER_CPU(struct clock_event_device, sparc32_clockevent);
62#endif
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064DEFINE_SPINLOCK(rtc_lock);
Sam Ravnborg6943f3d2009-01-08 16:58:05 -080065EXPORT_SYMBOL(rtc_lock);
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067unsigned long profile_pc(struct pt_regs *regs)
68{
69 extern char __copy_user_begin[], __copy_user_end[];
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 extern char __bzero_begin[], __bzero_end[];
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72 unsigned long pc = regs->pc;
73
74 if (in_lock_functions(pc) ||
75 (pc >= (unsigned long) __copy_user_begin &&
76 pc < (unsigned long) __copy_user_end) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 (pc >= (unsigned long) __bzero_begin &&
David S. Miller8a8b8362006-12-17 16:18:47 -080078 pc < (unsigned long) __bzero_end))
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 pc = regs->u_regs[UREG_RETPC];
80 return pc;
81}
82
Martin Habets9550e592006-10-17 19:21:48 -070083EXPORT_SYMBOL(profile_pc);
84
Sam Ravnborgfcea8b22014-05-16 23:25:44 +020085volatile u32 __iomem *master_l10_counter;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Tkhai Kirill62f08282012-04-04 21:49:26 +020087irqreturn_t notrace timer_interrupt(int dummy, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
Tkhai Kirill62f08282012-04-04 21:49:26 +020089 if (timer_cs_enabled) {
90 write_seqlock(&timer_cs_lock);
91 timer_cs_internal_counter++;
Sam Ravnborg08c93882012-05-14 17:30:35 +020092 sparc_config.clear_clock_irq();
Tkhai Kirill62f08282012-04-04 21:49:26 +020093 write_sequnlock(&timer_cs_lock);
94 } else {
Sam Ravnborg08c93882012-05-14 17:30:35 +020095 sparc_config.clear_clock_irq();
Tkhai Kirill62f08282012-04-04 21:49:26 +020096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Tkhai Kirill62f08282012-04-04 21:49:26 +020098 if (timer_ce_enabled)
99 timer_ce.event_handler(&timer_ce);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 return IRQ_HANDLED;
102}
103
Viresh Kumarff4aea42015-07-16 16:56:29 +0530104static int timer_ce_shutdown(struct clock_event_device *evt)
Tkhai Kirill62f08282012-04-04 21:49:26 +0200105{
Viresh Kumarff4aea42015-07-16 16:56:29 +0530106 timer_ce_enabled = 0;
Tkhai Kirill62f08282012-04-04 21:49:26 +0200107 smp_mb();
Viresh Kumarff4aea42015-07-16 16:56:29 +0530108 return 0;
109}
110
111static int timer_ce_set_periodic(struct clock_event_device *evt)
112{
113 timer_ce_enabled = 1;
114 smp_mb();
115 return 0;
Tkhai Kirill62f08282012-04-04 21:49:26 +0200116}
117
118static __init void setup_timer_ce(void)
119{
120 struct clock_event_device *ce = &timer_ce;
121
122 BUG_ON(smp_processor_id() != boot_cpu_id);
123
124 ce->name = "timer_ce";
125 ce->rating = 100;
126 ce->features = CLOCK_EVT_FEAT_PERIODIC;
Viresh Kumarff4aea42015-07-16 16:56:29 +0530127 ce->set_state_shutdown = timer_ce_shutdown;
128 ce->set_state_periodic = timer_ce_set_periodic;
129 ce->tick_resume = timer_ce_set_periodic;
Tkhai Kirill62f08282012-04-04 21:49:26 +0200130 ce->cpumask = cpu_possible_mask;
131 ce->shift = 32;
132 ce->mult = div_sc(sparc_config.clock_rate, NSEC_PER_SEC,
133 ce->shift);
134 clockevents_register_device(ce);
135}
136
137static unsigned int sbus_cycles_offset(void)
138{
Sam Ravnborgfcea8b22014-05-16 23:25:44 +0200139 u32 val, offset;
Tkhai Kirill62f08282012-04-04 21:49:26 +0200140
Sam Ravnborgfcea8b22014-05-16 23:25:44 +0200141 val = sbus_readl(master_l10_counter);
Tkhai Kirill62f08282012-04-04 21:49:26 +0200142 offset = (val >> TIMER_VALUE_SHIFT) & TIMER_VALUE_MASK;
143
144 /* Limit hit? */
145 if (val & TIMER_LIMIT_BIT)
146 offset += sparc_config.cs_period;
147
148 return offset;
149}
150
151static cycle_t timer_cs_read(struct clocksource *cs)
152{
153 unsigned int seq, offset;
154 u64 cycles;
155
156 do {
157 seq = read_seqbegin(&timer_cs_lock);
158
159 cycles = timer_cs_internal_counter;
160 offset = sparc_config.get_cycles_offset();
161 } while (read_seqretry(&timer_cs_lock, seq));
162
163 /* Count absolute cycles */
164 cycles *= sparc_config.cs_period;
165 cycles += offset;
166
167 return cycles;
168}
169
170static struct clocksource timer_cs = {
171 .name = "timer_cs",
172 .rating = 100,
173 .read = timer_cs_read,
174 .mask = CLOCKSOURCE_MASK(64),
Tkhai Kirill62f08282012-04-04 21:49:26 +0200175 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
176};
177
178static __init int setup_timer_cs(void)
179{
180 timer_cs_enabled = 1;
John Stultz3142f762015-03-11 21:16:38 -0700181 return clocksource_register_hz(&timer_cs, sparc_config.clock_rate);
Tkhai Kirill62f08282012-04-04 21:49:26 +0200182}
183
184#ifdef CONFIG_SMP
Viresh Kumarff4aea42015-07-16 16:56:29 +0530185static int percpu_ce_shutdown(struct clock_event_device *evt)
Tkhai Kirill62f08282012-04-04 21:49:26 +0200186{
Rusty Russelle4afa122015-04-18 11:18:27 +0930187 int cpu = cpumask_first(evt->cpumask);
Tkhai Kirill62f08282012-04-04 21:49:26 +0200188
Viresh Kumarff4aea42015-07-16 16:56:29 +0530189 sparc_config.load_profile_irq(cpu, 0);
190 return 0;
191}
192
193static int percpu_ce_set_periodic(struct clock_event_device *evt)
194{
195 int cpu = cpumask_first(evt->cpumask);
196
197 sparc_config.load_profile_irq(cpu, SBUS_CLOCK_RATE / HZ);
198 return 0;
Tkhai Kirill62f08282012-04-04 21:49:26 +0200199}
200
201static int percpu_ce_set_next_event(unsigned long delta,
202 struct clock_event_device *evt)
203{
Rusty Russelle4afa122015-04-18 11:18:27 +0930204 int cpu = cpumask_first(evt->cpumask);
Tkhai Kirill62f08282012-04-04 21:49:26 +0200205 unsigned int next = (unsigned int)delta;
206
Sam Ravnborg08c93882012-05-14 17:30:35 +0200207 sparc_config.load_profile_irq(cpu, next);
Tkhai Kirill62f08282012-04-04 21:49:26 +0200208 return 0;
209}
210
211void register_percpu_ce(int cpu)
212{
213 struct clock_event_device *ce = &per_cpu(sparc32_clockevent, cpu);
214 unsigned int features = CLOCK_EVT_FEAT_PERIODIC;
215
216 if (sparc_config.features & FEAT_L14_ONESHOT)
217 features |= CLOCK_EVT_FEAT_ONESHOT;
218
219 ce->name = "percpu_ce";
220 ce->rating = 200;
221 ce->features = features;
Viresh Kumarff4aea42015-07-16 16:56:29 +0530222 ce->set_state_shutdown = percpu_ce_shutdown;
223 ce->set_state_periodic = percpu_ce_set_periodic;
224 ce->set_state_oneshot = percpu_ce_shutdown;
Tkhai Kirill62f08282012-04-04 21:49:26 +0200225 ce->set_next_event = percpu_ce_set_next_event;
226 ce->cpumask = cpumask_of(cpu);
227 ce->shift = 32;
228 ce->mult = div_sc(sparc_config.clock_rate, NSEC_PER_SEC,
229 ce->shift);
230 ce->max_delta_ns = clockevent_delta2ns(sparc_config.clock_rate, ce);
231 ce->min_delta_ns = clockevent_delta2ns(100, ce);
232
233 clockevents_register_device(ce);
234}
235#endif
236
David S. Millerc4cbe6f2008-09-03 15:52:38 -0700237static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238{
David S. Millerc4cbe6f2008-09-03 15:52:38 -0700239 struct platform_device *pdev = to_platform_device(dev);
240 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700242 return readb(pdata->ioaddr + ofs);
David S. Millerc4cbe6f2008-09-03 15:52:38 -0700243}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
David S. Millerc4cbe6f2008-09-03 15:52:38 -0700245static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
246{
247 struct platform_device *pdev = to_platform_device(dev);
248 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700250 writeb(val, pdata->ioaddr + ofs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251}
252
David S. Millerc4cbe6f2008-09-03 15:52:38 -0700253static struct m48t59_plat_data m48t59_data = {
254 .read_byte = mostek_read_byte,
255 .write_byte = mostek_write_byte,
256};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
David S. Millerc4cbe6f2008-09-03 15:52:38 -0700258/* resource is set at runtime */
259static struct platform_device m48t59_rtc = {
260 .name = "rtc-m48t59",
261 .id = 0,
262 .num_resources = 1,
263 .dev = {
264 .platform_data = &m48t59_data,
265 },
266};
Bob Breuer96ba9892006-07-27 22:08:01 -0700267
Greg Kroah-Hartman7c9503b2012-12-21 14:03:26 -0800268static int clock_probe(struct platform_device *op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269{
Grant Likely61c7a082010-04-13 16:12:29 -0700270 struct device_node *dp = op->dev.of_node;
Stephen Rothwell8271f042007-03-29 00:47:23 -0700271 const char *model = of_get_property(dp, "model", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
David S. Milleree5caf02006-06-29 14:36:52 -0700273 if (!model)
274 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Kjetil Oftedal1c833bc2011-03-24 16:34:52 -0700276 /* Only the primary RTC has an address property */
277 if (!of_find_property(dp, "address", NULL))
278 return -ENODEV;
279
David S. Millerc4cbe6f2008-09-03 15:52:38 -0700280 m48t59_rtc.resource = &op->resource[0];
David S. Milleree5caf02006-06-29 14:36:52 -0700281 if (!strcmp(model, "mk48t02")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 /* Map the clock register io area read-only */
David S. Millerc4cbe6f2008-09-03 15:52:38 -0700283 m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0,
284 2048, "rtc-m48t59");
285 m48t59_data.type = M48T59RTC_TYPE_M48T02;
David S. Milleree5caf02006-06-29 14:36:52 -0700286 } else if (!strcmp(model, "mk48t08")) {
David S. Millerc4cbe6f2008-09-03 15:52:38 -0700287 m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0,
288 8192, "rtc-m48t59");
289 m48t59_data.type = M48T59RTC_TYPE_M48T08;
David S. Milleree5caf02006-06-29 14:36:52 -0700290 } else
291 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
David S. Millerc4cbe6f2008-09-03 15:52:38 -0700293 if (platform_device_register(&m48t59_rtc) < 0)
294 printk(KERN_ERR "Registering RTC device failed\n");
Bob Breuer96ba9892006-07-27 22:08:01 -0700295
David S. Milleree5caf02006-06-29 14:36:52 -0700296 return 0;
297}
298
Sam Ravnborg505d9142011-04-21 15:37:20 -0700299static struct of_device_id clock_match[] = {
David S. Milleree5caf02006-06-29 14:36:52 -0700300 {
301 .name = "eeprom",
302 },
303 {},
304};
305
Grant Likely4ebb24f2011-02-22 20:01:33 -0700306static struct platform_driver clock_driver = {
David S. Milleree5caf02006-06-29 14:36:52 -0700307 .probe = clock_probe,
Grant Likely40182942010-04-13 16:13:02 -0700308 .driver = {
309 .name = "rtc",
Grant Likely40182942010-04-13 16:13:02 -0700310 .of_match_table = clock_match,
Stephen Rothwella2cd1552007-10-10 23:27:34 -0700311 },
David S. Milleree5caf02006-06-29 14:36:52 -0700312};
313
314
315/* Probe for the mostek real time clock chip. */
Bob Breuer96ba9892006-07-27 22:08:01 -0700316static int __init clock_init(void)
David S. Milleree5caf02006-06-29 14:36:52 -0700317{
Grant Likely4ebb24f2011-02-22 20:01:33 -0700318 return platform_driver_register(&clock_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319}
Bob Breuer96ba9892006-07-27 22:08:01 -0700320/* Must be after subsys_initcall() so that busses are probed. Must
321 * be before device_initcall() because things like the RTC driver
322 * need to see the clock registers.
323 */
324fs_initcall(clock_init);
Bob Breuer96ba9892006-07-27 22:08:01 -0700325
Tkhai Kirill62f08282012-04-04 21:49:26 +0200326static void __init sparc32_late_time_init(void)
John Stultz0299b132010-01-15 01:34:28 -0800327{
Tkhai Kirill62f08282012-04-04 21:49:26 +0200328 if (sparc_config.features & FEAT_L10_CLOCKEVENT)
329 setup_timer_ce();
330 if (sparc_config.features & FEAT_L10_CLOCKSOURCE)
331 setup_timer_cs();
332#ifdef CONFIG_SMP
333 register_percpu_ce(smp_processor_id());
334#endif
John Stultz0299b132010-01-15 01:34:28 -0800335}
336
Adrian Bunkc61c65c2008-06-05 11:40:58 -0700337static void __init sbus_time_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
Tkhai Kirill62f08282012-04-04 21:49:26 +0200339 sparc_config.get_cycles_offset = sbus_cycles_offset;
340 sparc_config.init_timers();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341}
342
343void __init time_init(void)
344{
Tkhai Kirill62f08282012-04-04 21:49:26 +0200345 sparc_config.features = 0;
346 late_time_init = sparc32_late_time_init;
347
Sam Ravnborg06010fb2011-04-17 13:49:55 +0200348 if (pcic_present())
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 pci_time_init();
Sam Ravnborg06010fb2011-04-17 13:49:55 +0200350 else
351 sbus_time_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353