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Barry Song4898de32012-12-20 19:37:32 +08001/*
2 * System timer for CSR SiRFprimaII
3 *
4 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
5 *
6 * Licensed under GPLv2 or later.
7 */
8
9#include <linux/kernel.h>
10#include <linux/interrupt.h>
11#include <linux/clockchips.h>
12#include <linux/clocksource.h>
13#include <linux/bitops.h>
14#include <linux/irq.h>
15#include <linux/clk.h>
16#include <linux/slab.h>
17#include <linux/of.h>
18#include <linux/of_irq.h>
19#include <linux/of_address.h>
Stephen Boyd38ff87f2013-06-01 23:39:40 -070020#include <linux/sched_clock.h>
Barry Song4898de32012-12-20 19:37:32 +080021#include <asm/localtimer.h>
22#include <asm/mach/time.h>
23
Barry Song4898de32012-12-20 19:37:32 +080024#define SIRFSOC_TIMER_32COUNTER_0_CTRL 0x0000
25#define SIRFSOC_TIMER_32COUNTER_1_CTRL 0x0004
26#define SIRFSOC_TIMER_MATCH_0 0x0018
27#define SIRFSOC_TIMER_MATCH_1 0x001c
28#define SIRFSOC_TIMER_COUNTER_0 0x0048
29#define SIRFSOC_TIMER_COUNTER_1 0x004c
30#define SIRFSOC_TIMER_INTR_STATUS 0x0060
31#define SIRFSOC_TIMER_WATCHDOG_EN 0x0064
32#define SIRFSOC_TIMER_64COUNTER_CTRL 0x0068
33#define SIRFSOC_TIMER_64COUNTER_LO 0x006c
34#define SIRFSOC_TIMER_64COUNTER_HI 0x0070
35#define SIRFSOC_TIMER_64COUNTER_LOAD_LO 0x0074
36#define SIRFSOC_TIMER_64COUNTER_LOAD_HI 0x0078
37#define SIRFSOC_TIMER_64COUNTER_RLATCHED_LO 0x007c
38#define SIRFSOC_TIMER_64COUNTER_RLATCHED_HI 0x0080
39
40#define SIRFSOC_TIMER_REG_CNT 6
41
42static const u32 sirfsoc_timer_reg_list[SIRFSOC_TIMER_REG_CNT] = {
43 SIRFSOC_TIMER_WATCHDOG_EN,
44 SIRFSOC_TIMER_32COUNTER_0_CTRL,
45 SIRFSOC_TIMER_32COUNTER_1_CTRL,
46 SIRFSOC_TIMER_64COUNTER_CTRL,
47 SIRFSOC_TIMER_64COUNTER_RLATCHED_LO,
48 SIRFSOC_TIMER_64COUNTER_RLATCHED_HI,
49};
50
51static u32 sirfsoc_timer_reg_val[SIRFSOC_TIMER_REG_CNT];
52
53static void __iomem *sirfsoc_timer_base;
Barry Song4898de32012-12-20 19:37:32 +080054
55/* disable count and interrupt */
56static inline void sirfsoc_timer_count_disable(int idx)
57{
58 writel_relaxed(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx) & ~0x7,
59 sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx);
60}
61
62/* enable count and interrupt */
63static inline void sirfsoc_timer_count_enable(int idx)
64{
65 writel_relaxed(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx) | 0x7,
66 sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx);
67}
68
69/* timer interrupt handler */
70static irqreturn_t sirfsoc_timer_interrupt(int irq, void *dev_id)
71{
72 struct clock_event_device *ce = dev_id;
73 int cpu = smp_processor_id();
74
75 /* clear timer interrupt */
76 writel_relaxed(BIT(cpu), sirfsoc_timer_base + SIRFSOC_TIMER_INTR_STATUS);
77
78 if (ce->mode == CLOCK_EVT_MODE_ONESHOT)
79 sirfsoc_timer_count_disable(cpu);
80
81 ce->event_handler(ce);
82
83 return IRQ_HANDLED;
84}
85
86/* read 64-bit timer counter */
87static cycle_t sirfsoc_timer_read(struct clocksource *cs)
88{
89 u64 cycles;
90
91 writel_relaxed((readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL) |
92 BIT(0)) & ~BIT(1), sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL);
93
94 cycles = readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_RLATCHED_HI);
95 cycles = (cycles << 32) | readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_RLATCHED_LO);
96
97 return cycles;
98}
99
100static int sirfsoc_timer_set_next_event(unsigned long delta,
101 struct clock_event_device *ce)
102{
103 int cpu = smp_processor_id();
104
105 writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_0 +
106 4 * cpu);
107 writel_relaxed(delta, sirfsoc_timer_base + SIRFSOC_TIMER_MATCH_0 +
108 4 * cpu);
109
110 /* enable the tick */
111 sirfsoc_timer_count_enable(cpu);
112
113 return 0;
114}
115
116static void sirfsoc_timer_set_mode(enum clock_event_mode mode,
117 struct clock_event_device *ce)
118{
119 switch (mode) {
120 case CLOCK_EVT_MODE_ONESHOT:
121 /* enable in set_next_event */
122 break;
123 default:
124 break;
125 }
126
127 sirfsoc_timer_count_disable(smp_processor_id());
128}
129
130static void sirfsoc_clocksource_suspend(struct clocksource *cs)
131{
132 int i;
133
134 for (i = 0; i < SIRFSOC_TIMER_REG_CNT; i++)
135 sirfsoc_timer_reg_val[i] = readl_relaxed(sirfsoc_timer_base + sirfsoc_timer_reg_list[i]);
136}
137
138static void sirfsoc_clocksource_resume(struct clocksource *cs)
139{
140 int i;
141
142 for (i = 0; i < SIRFSOC_TIMER_REG_CNT - 2; i++)
143 writel_relaxed(sirfsoc_timer_reg_val[i], sirfsoc_timer_base + sirfsoc_timer_reg_list[i]);
144
145 writel_relaxed(sirfsoc_timer_reg_val[SIRFSOC_TIMER_REG_CNT - 2],
146 sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_LOAD_LO);
147 writel_relaxed(sirfsoc_timer_reg_val[SIRFSOC_TIMER_REG_CNT - 1],
148 sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_LOAD_HI);
149
150 writel_relaxed(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL) |
151 BIT(1) | BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL);
152}
153
154static struct clock_event_device sirfsoc_clockevent = {
155 .name = "sirfsoc_clockevent",
156 .rating = 200,
157 .features = CLOCK_EVT_FEAT_ONESHOT,
158 .set_mode = sirfsoc_timer_set_mode,
159 .set_next_event = sirfsoc_timer_set_next_event,
160};
161
162static struct clocksource sirfsoc_clocksource = {
163 .name = "sirfsoc_clocksource",
164 .rating = 200,
165 .mask = CLOCKSOURCE_MASK(64),
166 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
167 .read = sirfsoc_timer_read,
168 .suspend = sirfsoc_clocksource_suspend,
169 .resume = sirfsoc_clocksource_resume,
170};
171
172static struct irqaction sirfsoc_timer_irq = {
173 .name = "sirfsoc_timer0",
174 .flags = IRQF_TIMER | IRQF_NOBALANCING,
175 .handler = sirfsoc_timer_interrupt,
176 .dev_id = &sirfsoc_clockevent,
177};
178
179#ifdef CONFIG_LOCAL_TIMERS
180
181static struct irqaction sirfsoc_timer1_irq = {
182 .name = "sirfsoc_timer1",
183 .flags = IRQF_TIMER | IRQF_NOBALANCING,
184 .handler = sirfsoc_timer_interrupt,
185};
186
Paul Gortmaker8c37bb32013-06-19 11:32:08 -0400187static int sirfsoc_local_timer_setup(struct clock_event_device *ce)
Barry Song4898de32012-12-20 19:37:32 +0800188{
189 /* Use existing clock_event for cpu 0 */
190 if (!smp_processor_id())
191 return 0;
192
193 ce->irq = sirfsoc_timer1_irq.irq;
194 ce->name = "local_timer";
195 ce->features = sirfsoc_clockevent.features;
196 ce->rating = sirfsoc_clockevent.rating;
197 ce->set_mode = sirfsoc_timer_set_mode;
198 ce->set_next_event = sirfsoc_timer_set_next_event;
199 ce->shift = sirfsoc_clockevent.shift;
200 ce->mult = sirfsoc_clockevent.mult;
201 ce->max_delta_ns = sirfsoc_clockevent.max_delta_ns;
202 ce->min_delta_ns = sirfsoc_clockevent.min_delta_ns;
203
204 sirfsoc_timer1_irq.dev_id = ce;
205 BUG_ON(setup_irq(ce->irq, &sirfsoc_timer1_irq));
206 irq_set_affinity(sirfsoc_timer1_irq.irq, cpumask_of(1));
207
208 clockevents_register_device(ce);
209 return 0;
210}
211
212static void sirfsoc_local_timer_stop(struct clock_event_device *ce)
213{
214 sirfsoc_timer_count_disable(1);
215
216 remove_irq(sirfsoc_timer1_irq.irq, &sirfsoc_timer1_irq);
217}
218
Paul Gortmaker8c37bb32013-06-19 11:32:08 -0400219static struct local_timer_ops sirfsoc_local_timer_ops = {
Barry Song4898de32012-12-20 19:37:32 +0800220 .setup = sirfsoc_local_timer_setup,
221 .stop = sirfsoc_local_timer_stop,
222};
223#endif /* CONFIG_LOCAL_TIMERS */
224
225static void __init sirfsoc_clockevent_init(void)
226{
227 clockevents_calc_mult_shift(&sirfsoc_clockevent, CLOCK_TICK_RATE, 60);
228
229 sirfsoc_clockevent.max_delta_ns =
230 clockevent_delta2ns(-2, &sirfsoc_clockevent);
231 sirfsoc_clockevent.min_delta_ns =
232 clockevent_delta2ns(2, &sirfsoc_clockevent);
233
234 sirfsoc_clockevent.cpumask = cpumask_of(0);
235 clockevents_register_device(&sirfsoc_clockevent);
236#ifdef CONFIG_LOCAL_TIMERS
237 local_timer_register(&sirfsoc_local_timer_ops);
238#endif
239}
240
241/* initialize the kernel jiffy timer source */
Arnd Bergmann275786b2013-03-19 15:27:22 +0100242static void __init sirfsoc_marco_timer_init(void)
Barry Song4898de32012-12-20 19:37:32 +0800243{
244 unsigned long rate;
245 u32 timer_div;
246 struct clk *clk;
247
Barry Song4898de32012-12-20 19:37:32 +0800248 /* timer's input clock is io clock */
249 clk = clk_get_sys("io", NULL);
250
251 BUG_ON(IS_ERR(clk));
252 rate = clk_get_rate(clk);
253
254 BUG_ON(rate < CLOCK_TICK_RATE);
255 BUG_ON(rate % CLOCK_TICK_RATE);
256
Barry Song4898de32012-12-20 19:37:32 +0800257 /* Initialize the timer dividers */
258 timer_div = rate / CLOCK_TICK_RATE - 1;
259 writel_relaxed(timer_div << 16, sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL);
260 writel_relaxed(timer_div << 16, sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL);
261 writel_relaxed(timer_div << 16, sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_1_CTRL);
262
263 /* Initialize timer counters to 0 */
264 writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_LOAD_LO);
265 writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_LOAD_HI);
266 writel_relaxed(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL) |
267 BIT(1) | BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL);
268 writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_0);
269 writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_1);
270
271 /* Clear all interrupts */
272 writel_relaxed(0xFFFF, sirfsoc_timer_base + SIRFSOC_TIMER_INTR_STATUS);
273
274 BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, CLOCK_TICK_RATE));
275
276 BUG_ON(setup_irq(sirfsoc_timer_irq.irq, &sirfsoc_timer_irq));
277
278 sirfsoc_clockevent_init();
279}
280
Arnd Bergmann275786b2013-03-19 15:27:22 +0100281static void __init sirfsoc_of_timer_init(struct device_node *np)
Barry Song4898de32012-12-20 19:37:32 +0800282{
Barry Song4898de32012-12-20 19:37:32 +0800283 sirfsoc_timer_base = of_iomap(np, 0);
284 if (!sirfsoc_timer_base)
285 panic("unable to map timer cpu registers\n");
286
287 sirfsoc_timer_irq.irq = irq_of_parse_and_map(np, 0);
288 if (!sirfsoc_timer_irq.irq)
289 panic("No irq passed for timer0 via DT\n");
290
291#ifdef CONFIG_LOCAL_TIMERS
292 sirfsoc_timer1_irq.irq = irq_of_parse_and_map(np, 1);
293 if (!sirfsoc_timer1_irq.irq)
294 panic("No irq passed for timer1 via DT\n");
295#endif
296
Arnd Bergmann275786b2013-03-19 15:27:22 +0100297 sirfsoc_marco_timer_init();
Barry Song4898de32012-12-20 19:37:32 +0800298}
Arnd Bergmann275786b2013-03-19 15:27:22 +0100299CLOCKSOURCE_OF_DECLARE(sirfsoc_marco_timer, "sirf,marco-tick", sirfsoc_of_timer_init );