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1da177e4 | 1 | /* |
3b59b6be | 2 | * linux/arch/arm/mach-omap1/time.c |
1da177e4 LT |
3 | * |
4 | * OMAP Timers | |
5 | * | |
6 | * Copyright (C) 2004 Nokia Corporation | |
b3402cf5 | 7 | * Partial timer rewrite and additional dynamic tick timer support by |
1da177e4 LT |
8 | * Tony Lindgen <tony@atomide.com> and |
9 | * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com> | |
10 | * | |
11 | * MPU timer code based on the older MPU timer code for OMAP | |
12 | * Copyright (C) 2000 RidgeRun, Inc. | |
13 | * Author: Greg Lonnon <glonnon@ridgerun.com> | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify it | |
16 | * under the terms of the GNU General Public License as published by the | |
17 | * Free Software Foundation; either version 2 of the License, or (at your | |
18 | * option) any later version. | |
19 | * | |
20 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
21 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
22 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
23 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
24 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
25 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
26 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
27 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
29 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
30 | * | |
31 | * You should have received a copy of the GNU General Public License along | |
32 | * with this program; if not, write to the Free Software Foundation, Inc., | |
33 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
34 | */ | |
35 | ||
1da177e4 LT |
36 | #include <linux/kernel.h> |
37 | #include <linux/init.h> | |
38 | #include <linux/delay.h> | |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/sched.h> | |
41 | #include <linux/spinlock.h> | |
075192ae KH |
42 | #include <linux/clk.h> |
43 | #include <linux/err.h> | |
44 | #include <linux/clocksource.h> | |
45 | #include <linux/clockchips.h> | |
fced80c7 | 46 | #include <linux/io.h> |
f376ea17 | 47 | #include <linux/sched.h> |
1da177e4 LT |
48 | |
49 | #include <asm/system.h> | |
a09e64fb | 50 | #include <mach/hardware.h> |
1da177e4 LT |
51 | #include <asm/leds.h> |
52 | #include <asm/irq.h> | |
f376ea17 TL |
53 | #include <asm/sched_clock.h> |
54 | ||
1da177e4 LT |
55 | #include <asm/mach/irq.h> |
56 | #include <asm/mach/time.h> | |
57 | ||
706afdda | 58 | #include <plat/common.h> |
1da177e4 | 59 | |
05b5ca9b TL |
60 | #ifdef CONFIG_OMAP_MPU_TIMER |
61 | ||
1da177e4 LT |
62 | #define OMAP_MPU_TIMER_BASE OMAP_MPU_TIMER1_BASE |
63 | #define OMAP_MPU_TIMER_OFFSET 0x100 | |
64 | ||
1da177e4 LT |
65 | typedef struct { |
66 | u32 cntl; /* CNTL_TIMER, R/W */ | |
67 | u32 load_tim; /* LOAD_TIM, W */ | |
68 | u32 read_tim; /* READ_TIM, R */ | |
69 | } omap_mpu_timer_regs_t; | |
70 | ||
94113260 TL |
71 | #define omap_mpu_timer_base(n) \ |
72 | ((volatile omap_mpu_timer_regs_t*)OMAP1_IO_ADDRESS(OMAP_MPU_TIMER_BASE + \ | |
1da177e4 LT |
73 | (n)*OMAP_MPU_TIMER_OFFSET)) |
74 | ||
f376ea17 | 75 | static inline unsigned long notrace omap_mpu_timer_read(int nr) |
1da177e4 LT |
76 | { |
77 | volatile omap_mpu_timer_regs_t* timer = omap_mpu_timer_base(nr); | |
78 | return timer->read_tim; | |
79 | } | |
80 | ||
075192ae | 81 | static inline void omap_mpu_set_autoreset(int nr) |
1da177e4 LT |
82 | { |
83 | volatile omap_mpu_timer_regs_t* timer = omap_mpu_timer_base(nr); | |
84 | ||
075192ae | 85 | timer->cntl = timer->cntl | MPU_TIMER_AR; |
1da177e4 LT |
86 | } |
87 | ||
075192ae | 88 | static inline void omap_mpu_remove_autoreset(int nr) |
1da177e4 | 89 | { |
075192ae | 90 | volatile omap_mpu_timer_regs_t* timer = omap_mpu_timer_base(nr); |
1da177e4 | 91 | |
075192ae | 92 | timer->cntl = timer->cntl & ~MPU_TIMER_AR; |
1da177e4 LT |
93 | } |
94 | ||
075192ae KH |
95 | static inline void omap_mpu_timer_start(int nr, unsigned long load_val, |
96 | int autoreset) | |
97 | { | |
98 | volatile omap_mpu_timer_regs_t* timer = omap_mpu_timer_base(nr); | |
99 | unsigned int timerflags = (MPU_TIMER_CLOCK_ENABLE | MPU_TIMER_ST); | |
100 | ||
101 | if (autoreset) timerflags |= MPU_TIMER_AR; | |
102 | ||
103 | timer->cntl = MPU_TIMER_CLOCK_ENABLE; | |
104 | udelay(1); | |
105 | timer->load_tim = load_val; | |
106 | udelay(1); | |
107 | timer->cntl = timerflags; | |
108 | } | |
1da177e4 | 109 | |
06cad098 KH |
110 | static inline void omap_mpu_timer_stop(int nr) |
111 | { | |
112 | volatile omap_mpu_timer_regs_t* timer = omap_mpu_timer_base(nr); | |
113 | ||
114 | timer->cntl &= ~MPU_TIMER_ST; | |
115 | } | |
116 | ||
1da177e4 | 117 | /* |
075192ae KH |
118 | * --------------------------------------------------------------------------- |
119 | * MPU timer 1 ... count down to zero, interrupt, reload | |
120 | * --------------------------------------------------------------------------- | |
1da177e4 | 121 | */ |
075192ae | 122 | static int omap_mpu_set_next_event(unsigned long cycles, |
06cad098 | 123 | struct clock_event_device *evt) |
1da177e4 | 124 | { |
075192ae KH |
125 | omap_mpu_timer_start(0, cycles, 0); |
126 | return 0; | |
127 | } | |
1da177e4 | 128 | |
075192ae KH |
129 | static void omap_mpu_set_mode(enum clock_event_mode mode, |
130 | struct clock_event_device *evt) | |
131 | { | |
132 | switch (mode) { | |
133 | case CLOCK_EVT_MODE_PERIODIC: | |
134 | omap_mpu_set_autoreset(0); | |
135 | break; | |
136 | case CLOCK_EVT_MODE_ONESHOT: | |
06cad098 | 137 | omap_mpu_timer_stop(0); |
075192ae KH |
138 | omap_mpu_remove_autoreset(0); |
139 | break; | |
140 | case CLOCK_EVT_MODE_UNUSED: | |
141 | case CLOCK_EVT_MODE_SHUTDOWN: | |
18de5bc4 | 142 | case CLOCK_EVT_MODE_RESUME: |
075192ae KH |
143 | break; |
144 | } | |
1da177e4 LT |
145 | } |
146 | ||
075192ae KH |
147 | static struct clock_event_device clockevent_mpu_timer1 = { |
148 | .name = "mpu_timer1", | |
c6b349ed | 149 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, |
075192ae KH |
150 | .shift = 32, |
151 | .set_next_event = omap_mpu_set_next_event, | |
152 | .set_mode = omap_mpu_set_mode, | |
153 | }; | |
154 | ||
155 | static irqreturn_t omap_mpu_timer1_interrupt(int irq, void *dev_id) | |
1da177e4 | 156 | { |
075192ae | 157 | struct clock_event_device *evt = &clockevent_mpu_timer1; |
1da177e4 | 158 | |
075192ae | 159 | evt->event_handler(evt); |
1da177e4 LT |
160 | |
161 | return IRQ_HANDLED; | |
162 | } | |
163 | ||
075192ae KH |
164 | static struct irqaction omap_mpu_timer1_irq = { |
165 | .name = "mpu_timer1", | |
b30fabad | 166 | .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, |
075192ae | 167 | .handler = omap_mpu_timer1_interrupt, |
1da177e4 LT |
168 | }; |
169 | ||
075192ae KH |
170 | static __init void omap_init_mpu_timer(unsigned long rate) |
171 | { | |
075192ae KH |
172 | setup_irq(INT_TIMER1, &omap_mpu_timer1_irq); |
173 | omap_mpu_timer_start(0, (rate / HZ) - 1, 1); | |
174 | ||
175 | clockevent_mpu_timer1.mult = div_sc(rate, NSEC_PER_SEC, | |
176 | clockevent_mpu_timer1.shift); | |
177 | clockevent_mpu_timer1.max_delta_ns = | |
178 | clockevent_delta2ns(-1, &clockevent_mpu_timer1); | |
179 | clockevent_mpu_timer1.min_delta_ns = | |
180 | clockevent_delta2ns(1, &clockevent_mpu_timer1); | |
181 | ||
320ab2b0 | 182 | clockevent_mpu_timer1.cpumask = cpumask_of(0); |
075192ae KH |
183 | clockevents_register_device(&clockevent_mpu_timer1); |
184 | } | |
185 | ||
186 | ||
187 | /* | |
188 | * --------------------------------------------------------------------------- | |
189 | * MPU timer 2 ... free running 32-bit clock source and scheduler clock | |
190 | * --------------------------------------------------------------------------- | |
191 | */ | |
192 | ||
193 | static unsigned long omap_mpu_timer2_overflows; | |
194 | ||
195 | static irqreturn_t omap_mpu_timer2_interrupt(int irq, void *dev_id) | |
1da177e4 | 196 | { |
075192ae | 197 | omap_mpu_timer2_overflows++; |
1da177e4 LT |
198 | return IRQ_HANDLED; |
199 | } | |
200 | ||
075192ae KH |
201 | static struct irqaction omap_mpu_timer2_irq = { |
202 | .name = "mpu_timer2", | |
52e405ea | 203 | .flags = IRQF_DISABLED, |
075192ae | 204 | .handler = omap_mpu_timer2_interrupt, |
1da177e4 LT |
205 | }; |
206 | ||
8e19608e | 207 | static cycle_t mpu_read(struct clocksource *cs) |
1da177e4 | 208 | { |
075192ae KH |
209 | return ~omap_mpu_timer_read(1); |
210 | } | |
211 | ||
212 | static struct clocksource clocksource_mpu = { | |
213 | .name = "mpu_timer2", | |
214 | .rating = 300, | |
215 | .read = mpu_read, | |
216 | .mask = CLOCKSOURCE_MASK(32), | |
075192ae KH |
217 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
218 | }; | |
219 | ||
f376ea17 TL |
220 | static DEFINE_CLOCK_DATA(cd); |
221 | ||
4912cf04 TL |
222 | static inline unsigned long long notrace _omap_mpu_sched_clock(void) |
223 | { | |
224 | u32 cyc = mpu_read(&clocksource_mpu); | |
225 | return cyc_to_sched_clock(&cd, cyc, (u32)~0); | |
226 | } | |
227 | ||
228 | #ifndef CONFIG_OMAP_32K_TIMER | |
229 | unsigned long long notrace sched_clock(void) | |
230 | { | |
231 | return _omap_mpu_sched_clock(); | |
232 | } | |
233 | #else | |
234 | static unsigned long long notrace omap_mpu_sched_clock(void) | |
235 | { | |
236 | return _omap_mpu_sched_clock(); | |
237 | } | |
238 | #endif | |
239 | ||
f376ea17 TL |
240 | static void notrace mpu_update_sched_clock(void) |
241 | { | |
242 | u32 cyc = mpu_read(&clocksource_mpu); | |
243 | update_sched_clock(&cd, cyc, (u32)~0); | |
244 | } | |
245 | ||
075192ae KH |
246 | static void __init omap_init_clocksource(unsigned long rate) |
247 | { | |
248 | static char err[] __initdata = KERN_ERR | |
249 | "%s: can't register clocksource!\n"; | |
250 | ||
075192ae KH |
251 | setup_irq(INT_TIMER2, &omap_mpu_timer2_irq); |
252 | omap_mpu_timer_start(1, ~0, 1); | |
f376ea17 | 253 | init_sched_clock(&cd, mpu_update_sched_clock, 32, rate); |
075192ae | 254 | |
8437c25e | 255 | if (clocksource_register_hz(&clocksource_mpu, rate)) |
075192ae | 256 | printk(err, clocksource_mpu.name); |
1da177e4 LT |
257 | } |
258 | ||
05b5ca9b | 259 | static void __init omap_mpu_timer_init(void) |
1da177e4 | 260 | { |
075192ae KH |
261 | struct clk *ck_ref = clk_get(NULL, "ck_ref"); |
262 | unsigned long rate; | |
263 | ||
264 | BUG_ON(IS_ERR(ck_ref)); | |
265 | ||
266 | rate = clk_get_rate(ck_ref); | |
267 | clk_put(ck_ref); | |
268 | ||
269 | /* PTV = 0 */ | |
270 | rate /= 2; | |
271 | ||
272 | omap_init_mpu_timer(rate); | |
273 | omap_init_clocksource(rate); | |
05b5ca9b TL |
274 | } |
275 | ||
276 | #else | |
277 | static inline void omap_mpu_timer_init(void) | |
278 | { | |
279 | pr_err("Bogus timer, should not happen\n"); | |
280 | } | |
281 | #endif /* CONFIG_OMAP_MPU_TIMER */ | |
282 | ||
4912cf04 TL |
283 | #if defined(CONFIG_OMAP_MPU_TIMER) && defined(CONFIG_OMAP_32K_TIMER) |
284 | static unsigned long long (*preferred_sched_clock)(void); | |
285 | ||
286 | unsigned long long notrace sched_clock(void) | |
287 | { | |
288 | if (!preferred_sched_clock) | |
289 | return 0; | |
290 | ||
291 | return preferred_sched_clock(); | |
292 | } | |
293 | ||
294 | static inline void preferred_sched_clock_init(bool use_32k_sched_clock) | |
295 | { | |
296 | if (use_32k_sched_clock) | |
297 | preferred_sched_clock = omap_32k_sched_clock; | |
298 | else | |
299 | preferred_sched_clock = omap_mpu_sched_clock; | |
300 | } | |
301 | #else | |
302 | static inline void preferred_sched_clock_init(bool use_32k_sched_clcok) | |
303 | { | |
304 | } | |
305 | #endif | |
306 | ||
05b5ca9b TL |
307 | static inline int omap_32k_timer_usable(void) |
308 | { | |
309 | int res = false; | |
310 | ||
311 | if (cpu_is_omap730() || cpu_is_omap15xx()) | |
312 | return res; | |
313 | ||
314 | #ifdef CONFIG_OMAP_32K_TIMER | |
315 | res = omap_32k_timer_init(); | |
316 | #endif | |
317 | ||
318 | return res; | |
319 | } | |
320 | ||
321 | /* | |
322 | * --------------------------------------------------------------------------- | |
323 | * Timer initialization | |
324 | * --------------------------------------------------------------------------- | |
325 | */ | |
326 | static void __init omap_timer_init(void) | |
327 | { | |
4912cf04 TL |
328 | if (omap_32k_timer_usable()) { |
329 | preferred_sched_clock_init(1); | |
330 | } else { | |
05b5ca9b | 331 | omap_mpu_timer_init(); |
4912cf04 TL |
332 | preferred_sched_clock_init(0); |
333 | } | |
1da177e4 LT |
334 | } |
335 | ||
336 | struct sys_timer omap_timer = { | |
337 | .init = omap_timer_init, | |
1da177e4 | 338 | }; |