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30d8bead CY |
1 | /* linux/arch/arm/mach-exynos4/mct.c |
2 | * | |
3 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. | |
4 | * http://www.samsung.com | |
5 | * | |
6 | * EXYNOS4 MCT(Multi-Core Timer) support | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/sched.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/irq.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/clk.h> | |
18 | #include <linux/clockchips.h> | |
ee98d27d | 19 | #include <linux/cpu.h> |
30d8bead CY |
20 | #include <linux/platform_device.h> |
21 | #include <linux/delay.h> | |
22 | #include <linux/percpu.h> | |
2edb36c4 | 23 | #include <linux/of.h> |
36ba5d52 TA |
24 | #include <linux/of_irq.h> |
25 | #include <linux/of_address.h> | |
9fbf0c85 | 26 | #include <linux/clocksource.h> |
93bfb769 | 27 | #include <linux/sched_clock.h> |
30d8bead | 28 | |
a1ba7a7a TA |
29 | #define EXYNOS4_MCTREG(x) (x) |
30 | #define EXYNOS4_MCT_G_CNT_L EXYNOS4_MCTREG(0x100) | |
31 | #define EXYNOS4_MCT_G_CNT_U EXYNOS4_MCTREG(0x104) | |
32 | #define EXYNOS4_MCT_G_CNT_WSTAT EXYNOS4_MCTREG(0x110) | |
33 | #define EXYNOS4_MCT_G_COMP0_L EXYNOS4_MCTREG(0x200) | |
34 | #define EXYNOS4_MCT_G_COMP0_U EXYNOS4_MCTREG(0x204) | |
35 | #define EXYNOS4_MCT_G_COMP0_ADD_INCR EXYNOS4_MCTREG(0x208) | |
36 | #define EXYNOS4_MCT_G_TCON EXYNOS4_MCTREG(0x240) | |
37 | #define EXYNOS4_MCT_G_INT_CSTAT EXYNOS4_MCTREG(0x244) | |
38 | #define EXYNOS4_MCT_G_INT_ENB EXYNOS4_MCTREG(0x248) | |
39 | #define EXYNOS4_MCT_G_WSTAT EXYNOS4_MCTREG(0x24C) | |
40 | #define _EXYNOS4_MCT_L_BASE EXYNOS4_MCTREG(0x300) | |
41 | #define EXYNOS4_MCT_L_BASE(x) (_EXYNOS4_MCT_L_BASE + (0x100 * x)) | |
42 | #define EXYNOS4_MCT_L_MASK (0xffffff00) | |
43 | ||
44 | #define MCT_L_TCNTB_OFFSET (0x00) | |
45 | #define MCT_L_ICNTB_OFFSET (0x08) | |
46 | #define MCT_L_TCON_OFFSET (0x20) | |
47 | #define MCT_L_INT_CSTAT_OFFSET (0x30) | |
48 | #define MCT_L_INT_ENB_OFFSET (0x34) | |
49 | #define MCT_L_WSTAT_OFFSET (0x40) | |
50 | #define MCT_G_TCON_START (1 << 8) | |
51 | #define MCT_G_TCON_COMP0_AUTO_INC (1 << 1) | |
52 | #define MCT_G_TCON_COMP0_ENABLE (1 << 0) | |
53 | #define MCT_L_TCON_INTERVAL_MODE (1 << 2) | |
54 | #define MCT_L_TCON_INT_START (1 << 1) | |
55 | #define MCT_L_TCON_TIMER_START (1 << 0) | |
56 | ||
4d2e4d7f CY |
57 | #define TICK_BASE_CNT 1 |
58 | ||
3a062281 CY |
59 | enum { |
60 | MCT_INT_SPI, | |
61 | MCT_INT_PPI | |
62 | }; | |
63 | ||
c371dc60 TA |
64 | enum { |
65 | MCT_G0_IRQ, | |
66 | MCT_G1_IRQ, | |
67 | MCT_G2_IRQ, | |
68 | MCT_G3_IRQ, | |
69 | MCT_L0_IRQ, | |
70 | MCT_L1_IRQ, | |
71 | MCT_L2_IRQ, | |
72 | MCT_L3_IRQ, | |
6c16dedf CK |
73 | MCT_L4_IRQ, |
74 | MCT_L5_IRQ, | |
75 | MCT_L6_IRQ, | |
76 | MCT_L7_IRQ, | |
c371dc60 TA |
77 | MCT_NR_IRQS, |
78 | }; | |
79 | ||
a1ba7a7a | 80 | static void __iomem *reg_base; |
30d8bead | 81 | static unsigned long clk_rate; |
3a062281 | 82 | static unsigned int mct_int_type; |
c371dc60 | 83 | static int mct_irqs[MCT_NR_IRQS]; |
30d8bead CY |
84 | |
85 | struct mct_clock_event_device { | |
ee98d27d | 86 | struct clock_event_device evt; |
a1ba7a7a | 87 | unsigned long base; |
c8987470 | 88 | char name[10]; |
30d8bead CY |
89 | }; |
90 | ||
a1ba7a7a | 91 | static void exynos4_mct_write(unsigned int value, unsigned long offset) |
30d8bead | 92 | { |
a1ba7a7a | 93 | unsigned long stat_addr; |
30d8bead CY |
94 | u32 mask; |
95 | u32 i; | |
96 | ||
a1ba7a7a | 97 | __raw_writel(value, reg_base + offset); |
30d8bead | 98 | |
a1ba7a7a TA |
99 | if (likely(offset >= EXYNOS4_MCT_L_BASE(0))) { |
100 | stat_addr = (offset & ~EXYNOS4_MCT_L_MASK) + MCT_L_WSTAT_OFFSET; | |
101 | switch (offset & EXYNOS4_MCT_L_MASK) { | |
102 | case MCT_L_TCON_OFFSET: | |
c8987470 CY |
103 | mask = 1 << 3; /* L_TCON write status */ |
104 | break; | |
a1ba7a7a | 105 | case MCT_L_ICNTB_OFFSET: |
c8987470 CY |
106 | mask = 1 << 1; /* L_ICNTB write status */ |
107 | break; | |
a1ba7a7a | 108 | case MCT_L_TCNTB_OFFSET: |
c8987470 CY |
109 | mask = 1 << 0; /* L_TCNTB write status */ |
110 | break; | |
111 | default: | |
112 | return; | |
113 | } | |
114 | } else { | |
a1ba7a7a TA |
115 | switch (offset) { |
116 | case EXYNOS4_MCT_G_TCON: | |
c8987470 CY |
117 | stat_addr = EXYNOS4_MCT_G_WSTAT; |
118 | mask = 1 << 16; /* G_TCON write status */ | |
119 | break; | |
a1ba7a7a | 120 | case EXYNOS4_MCT_G_COMP0_L: |
c8987470 CY |
121 | stat_addr = EXYNOS4_MCT_G_WSTAT; |
122 | mask = 1 << 0; /* G_COMP0_L write status */ | |
123 | break; | |
a1ba7a7a | 124 | case EXYNOS4_MCT_G_COMP0_U: |
c8987470 CY |
125 | stat_addr = EXYNOS4_MCT_G_WSTAT; |
126 | mask = 1 << 1; /* G_COMP0_U write status */ | |
127 | break; | |
a1ba7a7a | 128 | case EXYNOS4_MCT_G_COMP0_ADD_INCR: |
c8987470 CY |
129 | stat_addr = EXYNOS4_MCT_G_WSTAT; |
130 | mask = 1 << 2; /* G_COMP0_ADD_INCR w status */ | |
131 | break; | |
a1ba7a7a | 132 | case EXYNOS4_MCT_G_CNT_L: |
c8987470 CY |
133 | stat_addr = EXYNOS4_MCT_G_CNT_WSTAT; |
134 | mask = 1 << 0; /* G_CNT_L write status */ | |
135 | break; | |
a1ba7a7a | 136 | case EXYNOS4_MCT_G_CNT_U: |
c8987470 CY |
137 | stat_addr = EXYNOS4_MCT_G_CNT_WSTAT; |
138 | mask = 1 << 1; /* G_CNT_U write status */ | |
139 | break; | |
140 | default: | |
141 | return; | |
142 | } | |
30d8bead CY |
143 | } |
144 | ||
145 | /* Wait maximum 1 ms until written values are applied */ | |
146 | for (i = 0; i < loops_per_jiffy / 1000 * HZ; i++) | |
a1ba7a7a TA |
147 | if (__raw_readl(reg_base + stat_addr) & mask) { |
148 | __raw_writel(mask, reg_base + stat_addr); | |
30d8bead CY |
149 | return; |
150 | } | |
151 | ||
a1ba7a7a | 152 | panic("MCT hangs after writing %d (offset:0x%lx)\n", value, offset); |
30d8bead CY |
153 | } |
154 | ||
155 | /* Clocksource handling */ | |
1d80415d | 156 | static void exynos4_mct_frc_start(void) |
30d8bead CY |
157 | { |
158 | u32 reg; | |
159 | ||
a1ba7a7a | 160 | reg = __raw_readl(reg_base + EXYNOS4_MCT_G_TCON); |
30d8bead CY |
161 | reg |= MCT_G_TCON_START; |
162 | exynos4_mct_write(reg, EXYNOS4_MCT_G_TCON); | |
163 | } | |
164 | ||
89e6a13b | 165 | static cycle_t notrace _exynos4_frc_read(void) |
30d8bead CY |
166 | { |
167 | unsigned int lo, hi; | |
a1ba7a7a | 168 | u32 hi2 = __raw_readl(reg_base + EXYNOS4_MCT_G_CNT_U); |
30d8bead CY |
169 | |
170 | do { | |
171 | hi = hi2; | |
a1ba7a7a TA |
172 | lo = __raw_readl(reg_base + EXYNOS4_MCT_G_CNT_L); |
173 | hi2 = __raw_readl(reg_base + EXYNOS4_MCT_G_CNT_U); | |
30d8bead CY |
174 | } while (hi != hi2); |
175 | ||
176 | return ((cycle_t)hi << 32) | lo; | |
177 | } | |
178 | ||
89e6a13b DA |
179 | static cycle_t exynos4_frc_read(struct clocksource *cs) |
180 | { | |
181 | return _exynos4_frc_read(); | |
182 | } | |
183 | ||
aa421c13 CY |
184 | static void exynos4_frc_resume(struct clocksource *cs) |
185 | { | |
1d80415d | 186 | exynos4_mct_frc_start(); |
aa421c13 CY |
187 | } |
188 | ||
30d8bead CY |
189 | struct clocksource mct_frc = { |
190 | .name = "mct-frc", | |
191 | .rating = 400, | |
192 | .read = exynos4_frc_read, | |
193 | .mask = CLOCKSOURCE_MASK(64), | |
194 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, | |
aa421c13 | 195 | .resume = exynos4_frc_resume, |
30d8bead CY |
196 | }; |
197 | ||
93bfb769 VG |
198 | static u64 notrace exynos4_read_sched_clock(void) |
199 | { | |
89e6a13b | 200 | return _exynos4_frc_read(); |
93bfb769 VG |
201 | } |
202 | ||
8bf13a43 ADK |
203 | static struct delay_timer exynos4_delay_timer; |
204 | ||
205 | static cycles_t exynos4_read_current_timer(void) | |
206 | { | |
207 | return _exynos4_frc_read(); | |
208 | } | |
209 | ||
30d8bead CY |
210 | static void __init exynos4_clocksource_init(void) |
211 | { | |
1d80415d | 212 | exynos4_mct_frc_start(); |
30d8bead | 213 | |
8bf13a43 ADK |
214 | exynos4_delay_timer.read_current_timer = &exynos4_read_current_timer; |
215 | exynos4_delay_timer.freq = clk_rate; | |
216 | register_current_timer_delay(&exynos4_delay_timer); | |
217 | ||
30d8bead CY |
218 | if (clocksource_register_hz(&mct_frc, clk_rate)) |
219 | panic("%s: can't register clocksource\n", mct_frc.name); | |
93bfb769 VG |
220 | |
221 | sched_clock_register(exynos4_read_sched_clock, 64, clk_rate); | |
30d8bead CY |
222 | } |
223 | ||
224 | static void exynos4_mct_comp0_stop(void) | |
225 | { | |
226 | unsigned int tcon; | |
227 | ||
a1ba7a7a | 228 | tcon = __raw_readl(reg_base + EXYNOS4_MCT_G_TCON); |
30d8bead CY |
229 | tcon &= ~(MCT_G_TCON_COMP0_ENABLE | MCT_G_TCON_COMP0_AUTO_INC); |
230 | ||
231 | exynos4_mct_write(tcon, EXYNOS4_MCT_G_TCON); | |
232 | exynos4_mct_write(0, EXYNOS4_MCT_G_INT_ENB); | |
233 | } | |
234 | ||
235 | static void exynos4_mct_comp0_start(enum clock_event_mode mode, | |
236 | unsigned long cycles) | |
237 | { | |
238 | unsigned int tcon; | |
239 | cycle_t comp_cycle; | |
240 | ||
a1ba7a7a | 241 | tcon = __raw_readl(reg_base + EXYNOS4_MCT_G_TCON); |
30d8bead CY |
242 | |
243 | if (mode == CLOCK_EVT_MODE_PERIODIC) { | |
244 | tcon |= MCT_G_TCON_COMP0_AUTO_INC; | |
245 | exynos4_mct_write(cycles, EXYNOS4_MCT_G_COMP0_ADD_INCR); | |
246 | } | |
247 | ||
248 | comp_cycle = exynos4_frc_read(&mct_frc) + cycles; | |
249 | exynos4_mct_write((u32)comp_cycle, EXYNOS4_MCT_G_COMP0_L); | |
250 | exynos4_mct_write((u32)(comp_cycle >> 32), EXYNOS4_MCT_G_COMP0_U); | |
251 | ||
252 | exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_ENB); | |
253 | ||
254 | tcon |= MCT_G_TCON_COMP0_ENABLE; | |
255 | exynos4_mct_write(tcon , EXYNOS4_MCT_G_TCON); | |
256 | } | |
257 | ||
258 | static int exynos4_comp_set_next_event(unsigned long cycles, | |
259 | struct clock_event_device *evt) | |
260 | { | |
261 | exynos4_mct_comp0_start(evt->mode, cycles); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static void exynos4_comp_set_mode(enum clock_event_mode mode, | |
267 | struct clock_event_device *evt) | |
268 | { | |
4d2e4d7f | 269 | unsigned long cycles_per_jiffy; |
30d8bead CY |
270 | exynos4_mct_comp0_stop(); |
271 | ||
272 | switch (mode) { | |
273 | case CLOCK_EVT_MODE_PERIODIC: | |
4d2e4d7f CY |
274 | cycles_per_jiffy = |
275 | (((unsigned long long) NSEC_PER_SEC / HZ * evt->mult) >> evt->shift); | |
276 | exynos4_mct_comp0_start(mode, cycles_per_jiffy); | |
30d8bead CY |
277 | break; |
278 | ||
279 | case CLOCK_EVT_MODE_ONESHOT: | |
280 | case CLOCK_EVT_MODE_UNUSED: | |
281 | case CLOCK_EVT_MODE_SHUTDOWN: | |
282 | case CLOCK_EVT_MODE_RESUME: | |
283 | break; | |
284 | } | |
285 | } | |
286 | ||
287 | static struct clock_event_device mct_comp_device = { | |
288 | .name = "mct-comp", | |
289 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, | |
290 | .rating = 250, | |
291 | .set_next_event = exynos4_comp_set_next_event, | |
292 | .set_mode = exynos4_comp_set_mode, | |
293 | }; | |
294 | ||
295 | static irqreturn_t exynos4_mct_comp_isr(int irq, void *dev_id) | |
296 | { | |
297 | struct clock_event_device *evt = dev_id; | |
298 | ||
299 | exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_CSTAT); | |
300 | ||
301 | evt->event_handler(evt); | |
302 | ||
303 | return IRQ_HANDLED; | |
304 | } | |
305 | ||
306 | static struct irqaction mct_comp_event_irq = { | |
307 | .name = "mct_comp_irq", | |
308 | .flags = IRQF_TIMER | IRQF_IRQPOLL, | |
309 | .handler = exynos4_mct_comp_isr, | |
310 | .dev_id = &mct_comp_device, | |
311 | }; | |
312 | ||
313 | static void exynos4_clockevent_init(void) | |
314 | { | |
30d8bead | 315 | mct_comp_device.cpumask = cpumask_of(0); |
838a2ae8 SG |
316 | clockevents_config_and_register(&mct_comp_device, clk_rate, |
317 | 0xf, 0xffffffff); | |
c371dc60 | 318 | setup_irq(mct_irqs[MCT_G0_IRQ], &mct_comp_event_irq); |
30d8bead CY |
319 | } |
320 | ||
991a6c7d KK |
321 | static DEFINE_PER_CPU(struct mct_clock_event_device, percpu_mct_tick); |
322 | ||
30d8bead CY |
323 | /* Clock event handling */ |
324 | static void exynos4_mct_tick_stop(struct mct_clock_event_device *mevt) | |
325 | { | |
326 | unsigned long tmp; | |
327 | unsigned long mask = MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START; | |
a1ba7a7a | 328 | unsigned long offset = mevt->base + MCT_L_TCON_OFFSET; |
30d8bead | 329 | |
a1ba7a7a | 330 | tmp = __raw_readl(reg_base + offset); |
30d8bead CY |
331 | if (tmp & mask) { |
332 | tmp &= ~mask; | |
a1ba7a7a | 333 | exynos4_mct_write(tmp, offset); |
30d8bead CY |
334 | } |
335 | } | |
336 | ||
337 | static void exynos4_mct_tick_start(unsigned long cycles, | |
338 | struct mct_clock_event_device *mevt) | |
339 | { | |
340 | unsigned long tmp; | |
341 | ||
342 | exynos4_mct_tick_stop(mevt); | |
343 | ||
344 | tmp = (1 << 31) | cycles; /* MCT_L_UPDATE_ICNTB */ | |
345 | ||
346 | /* update interrupt count buffer */ | |
347 | exynos4_mct_write(tmp, mevt->base + MCT_L_ICNTB_OFFSET); | |
348 | ||
25985edc | 349 | /* enable MCT tick interrupt */ |
30d8bead CY |
350 | exynos4_mct_write(0x1, mevt->base + MCT_L_INT_ENB_OFFSET); |
351 | ||
a1ba7a7a | 352 | tmp = __raw_readl(reg_base + mevt->base + MCT_L_TCON_OFFSET); |
30d8bead CY |
353 | tmp |= MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START | |
354 | MCT_L_TCON_INTERVAL_MODE; | |
355 | exynos4_mct_write(tmp, mevt->base + MCT_L_TCON_OFFSET); | |
356 | } | |
357 | ||
358 | static int exynos4_tick_set_next_event(unsigned long cycles, | |
359 | struct clock_event_device *evt) | |
360 | { | |
e700e41d | 361 | struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick); |
30d8bead CY |
362 | |
363 | exynos4_mct_tick_start(cycles, mevt); | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static inline void exynos4_tick_set_mode(enum clock_event_mode mode, | |
369 | struct clock_event_device *evt) | |
370 | { | |
e700e41d | 371 | struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick); |
4d2e4d7f | 372 | unsigned long cycles_per_jiffy; |
30d8bead CY |
373 | |
374 | exynos4_mct_tick_stop(mevt); | |
375 | ||
376 | switch (mode) { | |
377 | case CLOCK_EVT_MODE_PERIODIC: | |
4d2e4d7f CY |
378 | cycles_per_jiffy = |
379 | (((unsigned long long) NSEC_PER_SEC / HZ * evt->mult) >> evt->shift); | |
380 | exynos4_mct_tick_start(cycles_per_jiffy, mevt); | |
30d8bead CY |
381 | break; |
382 | ||
383 | case CLOCK_EVT_MODE_ONESHOT: | |
384 | case CLOCK_EVT_MODE_UNUSED: | |
385 | case CLOCK_EVT_MODE_SHUTDOWN: | |
386 | case CLOCK_EVT_MODE_RESUME: | |
387 | break; | |
388 | } | |
389 | } | |
390 | ||
c8987470 | 391 | static int exynos4_mct_tick_clear(struct mct_clock_event_device *mevt) |
30d8bead | 392 | { |
ee98d27d | 393 | struct clock_event_device *evt = &mevt->evt; |
30d8bead CY |
394 | |
395 | /* | |
396 | * This is for supporting oneshot mode. | |
397 | * Mct would generate interrupt periodically | |
398 | * without explicit stopping. | |
399 | */ | |
400 | if (evt->mode != CLOCK_EVT_MODE_PERIODIC) | |
401 | exynos4_mct_tick_stop(mevt); | |
402 | ||
403 | /* Clear the MCT tick interrupt */ | |
a1ba7a7a | 404 | if (__raw_readl(reg_base + mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1) { |
3a062281 CY |
405 | exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET); |
406 | return 1; | |
407 | } else { | |
408 | return 0; | |
409 | } | |
410 | } | |
411 | ||
412 | static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id) | |
413 | { | |
414 | struct mct_clock_event_device *mevt = dev_id; | |
ee98d27d | 415 | struct clock_event_device *evt = &mevt->evt; |
3a062281 CY |
416 | |
417 | exynos4_mct_tick_clear(mevt); | |
30d8bead CY |
418 | |
419 | evt->event_handler(evt); | |
420 | ||
421 | return IRQ_HANDLED; | |
422 | } | |
423 | ||
8c37bb3a | 424 | static int exynos4_local_timer_setup(struct clock_event_device *evt) |
30d8bead | 425 | { |
e700e41d | 426 | struct mct_clock_event_device *mevt; |
30d8bead CY |
427 | unsigned int cpu = smp_processor_id(); |
428 | ||
ee98d27d | 429 | mevt = container_of(evt, struct mct_clock_event_device, evt); |
30d8bead | 430 | |
e700e41d | 431 | mevt->base = EXYNOS4_MCT_L_BASE(cpu); |
09e15176 | 432 | snprintf(mevt->name, sizeof(mevt->name), "mct_tick%d", cpu); |
30d8bead | 433 | |
e700e41d | 434 | evt->name = mevt->name; |
30d8bead CY |
435 | evt->cpumask = cpumask_of(cpu); |
436 | evt->set_next_event = exynos4_tick_set_next_event; | |
437 | evt->set_mode = exynos4_tick_set_mode; | |
438 | evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; | |
439 | evt->rating = 450; | |
30d8bead | 440 | |
4d2e4d7f | 441 | exynos4_mct_write(TICK_BASE_CNT, mevt->base + MCT_L_TCNTB_OFFSET); |
30d8bead | 442 | |
3a062281 | 443 | if (mct_int_type == MCT_INT_SPI) { |
7114cd74 CK |
444 | evt->irq = mct_irqs[MCT_L0_IRQ + cpu]; |
445 | if (request_irq(evt->irq, exynos4_mct_tick_isr, | |
446 | IRQF_TIMER | IRQF_NOBALANCING, | |
447 | evt->name, mevt)) { | |
448 | pr_err("exynos-mct: cannot register IRQ %d\n", | |
449 | evt->irq); | |
450 | return -EIO; | |
3a062281 | 451 | } |
30ccf03b | 452 | irq_force_affinity(mct_irqs[MCT_L0_IRQ + cpu], cpumask_of(cpu)); |
30d8bead | 453 | } else { |
c371dc60 | 454 | enable_percpu_irq(mct_irqs[MCT_L0_IRQ], 0); |
30d8bead | 455 | } |
8db6e510 KK |
456 | clockevents_config_and_register(evt, clk_rate / (TICK_BASE_CNT + 1), |
457 | 0xf, 0x7fffffff); | |
4d487d7e KK |
458 | |
459 | return 0; | |
30d8bead CY |
460 | } |
461 | ||
a8cb6041 | 462 | static void exynos4_local_timer_stop(struct clock_event_device *evt) |
30d8bead | 463 | { |
28af690a | 464 | evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt); |
e700e41d | 465 | if (mct_int_type == MCT_INT_SPI) |
7114cd74 | 466 | free_irq(evt->irq, this_cpu_ptr(&percpu_mct_tick)); |
e700e41d | 467 | else |
c371dc60 | 468 | disable_percpu_irq(mct_irqs[MCT_L0_IRQ]); |
30d8bead | 469 | } |
a8cb6041 | 470 | |
47dcd356 | 471 | static int exynos4_mct_cpu_notify(struct notifier_block *self, |
ee98d27d SB |
472 | unsigned long action, void *hcpu) |
473 | { | |
474 | struct mct_clock_event_device *mevt; | |
475 | ||
476 | /* | |
477 | * Grab cpu pointer in each case to avoid spurious | |
478 | * preemptible warnings | |
479 | */ | |
480 | switch (action & ~CPU_TASKS_FROZEN) { | |
481 | case CPU_STARTING: | |
482 | mevt = this_cpu_ptr(&percpu_mct_tick); | |
483 | exynos4_local_timer_setup(&mevt->evt); | |
484 | break; | |
485 | case CPU_DYING: | |
486 | mevt = this_cpu_ptr(&percpu_mct_tick); | |
487 | exynos4_local_timer_stop(&mevt->evt); | |
488 | break; | |
489 | } | |
490 | ||
491 | return NOTIFY_OK; | |
492 | } | |
493 | ||
47dcd356 | 494 | static struct notifier_block exynos4_mct_cpu_nb = { |
ee98d27d | 495 | .notifier_call = exynos4_mct_cpu_notify, |
a8cb6041 | 496 | }; |
30d8bead | 497 | |
19ce4f4a | 498 | static void __init exynos4_timer_resources(struct device_node *np, void __iomem *base) |
30d8bead | 499 | { |
ee98d27d SB |
500 | int err; |
501 | struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick); | |
ca9048ec | 502 | struct clk *mct_clk, *tick_clk; |
30d8bead | 503 | |
415ac2e2 TA |
504 | tick_clk = np ? of_clk_get_by_name(np, "fin_pll") : |
505 | clk_get(NULL, "fin_pll"); | |
506 | if (IS_ERR(tick_clk)) | |
507 | panic("%s: unable to determine tick clock rate\n", __func__); | |
508 | clk_rate = clk_get_rate(tick_clk); | |
e700e41d | 509 | |
ca9048ec TA |
510 | mct_clk = np ? of_clk_get_by_name(np, "mct") : clk_get(NULL, "mct"); |
511 | if (IS_ERR(mct_clk)) | |
512 | panic("%s: unable to retrieve mct clock instance\n", __func__); | |
513 | clk_prepare_enable(mct_clk); | |
e700e41d | 514 | |
228e3023 | 515 | reg_base = base; |
36ba5d52 TA |
516 | if (!reg_base) |
517 | panic("%s: unable to ioremap mct address space\n", __func__); | |
a1ba7a7a | 518 | |
e700e41d | 519 | if (mct_int_type == MCT_INT_PPI) { |
e700e41d | 520 | |
c371dc60 | 521 | err = request_percpu_irq(mct_irqs[MCT_L0_IRQ], |
e700e41d MZ |
522 | exynos4_mct_tick_isr, "MCT", |
523 | &percpu_mct_tick); | |
524 | WARN(err, "MCT: can't request IRQ %d (%d)\n", | |
c371dc60 | 525 | mct_irqs[MCT_L0_IRQ], err); |
5df718d8 TF |
526 | } else { |
527 | irq_set_affinity(mct_irqs[MCT_L0_IRQ], cpumask_of(0)); | |
e700e41d | 528 | } |
a8cb6041 | 529 | |
ee98d27d SB |
530 | err = register_cpu_notifier(&exynos4_mct_cpu_nb); |
531 | if (err) | |
532 | goto out_irq; | |
533 | ||
534 | /* Immediately configure the timer on the boot CPU */ | |
535 | exynos4_local_timer_setup(&mevt->evt); | |
536 | return; | |
537 | ||
538 | out_irq: | |
539 | free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick); | |
30d8bead CY |
540 | } |
541 | ||
034c097c | 542 | void __init mct_init(void __iomem *base, int irq_g0, int irq_l0, int irq_l1) |
30d8bead | 543 | { |
034c097c AB |
544 | mct_irqs[MCT_G0_IRQ] = irq_g0; |
545 | mct_irqs[MCT_L0_IRQ] = irq_l0; | |
546 | mct_irqs[MCT_L1_IRQ] = irq_l1; | |
547 | mct_int_type = MCT_INT_SPI; | |
2edb36c4 | 548 | |
034c097c | 549 | exynos4_timer_resources(NULL, base); |
30d8bead CY |
550 | exynos4_clocksource_init(); |
551 | exynos4_clockevent_init(); | |
552 | } | |
3a062281 | 553 | |
228e3023 AB |
554 | static void __init mct_init_dt(struct device_node *np, unsigned int int_type) |
555 | { | |
556 | u32 nr_irqs, i; | |
557 | ||
558 | mct_int_type = int_type; | |
559 | ||
560 | /* This driver uses only one global timer interrupt */ | |
561 | mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ); | |
562 | ||
563 | /* | |
564 | * Find out the number of local irqs specified. The local | |
565 | * timer irqs are specified after the four global timer | |
566 | * irqs are specified. | |
567 | */ | |
f4636d0a | 568 | #ifdef CONFIG_OF |
228e3023 | 569 | nr_irqs = of_irq_count(np); |
f4636d0a AB |
570 | #else |
571 | nr_irqs = 0; | |
572 | #endif | |
228e3023 AB |
573 | for (i = MCT_L0_IRQ; i < nr_irqs; i++) |
574 | mct_irqs[i] = irq_of_parse_and_map(np, i); | |
575 | ||
19ce4f4a | 576 | exynos4_timer_resources(np, of_iomap(np, 0)); |
30d8bead CY |
577 | exynos4_clocksource_init(); |
578 | exynos4_clockevent_init(); | |
579 | } | |
228e3023 AB |
580 | |
581 | ||
582 | static void __init mct_init_spi(struct device_node *np) | |
583 | { | |
584 | return mct_init_dt(np, MCT_INT_SPI); | |
585 | } | |
586 | ||
587 | static void __init mct_init_ppi(struct device_node *np) | |
588 | { | |
589 | return mct_init_dt(np, MCT_INT_PPI); | |
590 | } | |
591 | CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init_spi); | |
592 | CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init_ppi); |