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8a4da6e3 MR |
1 | /* |
2 | * linux/drivers/clocksource/arm_arch_timer.c | |
3 | * | |
4 | * Copyright (C) 2011 ARM Ltd. | |
5 | * All Rights Reserved | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/init.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/smp.h> | |
15 | #include <linux/cpu.h> | |
346e7480 | 16 | #include <linux/cpu_pm.h> |
8a4da6e3 | 17 | #include <linux/clockchips.h> |
7c8f1e78 | 18 | #include <linux/clocksource.h> |
8a4da6e3 MR |
19 | #include <linux/interrupt.h> |
20 | #include <linux/of_irq.h> | |
22006994 | 21 | #include <linux/of_address.h> |
8a4da6e3 | 22 | #include <linux/io.h> |
22006994 | 23 | #include <linux/slab.h> |
65cd4f6c | 24 | #include <linux/sched_clock.h> |
b09ca1ec | 25 | #include <linux/acpi.h> |
8a4da6e3 MR |
26 | |
27 | #include <asm/arch_timer.h> | |
8266891e | 28 | #include <asm/virt.h> |
8a4da6e3 MR |
29 | |
30 | #include <clocksource/arm_arch_timer.h> | |
31 | ||
22006994 SB |
32 | #define CNTTIDR 0x08 |
33 | #define CNTTIDR_VIRT(n) (BIT(1) << ((n) * 4)) | |
34 | ||
e392d603 RM |
35 | #define CNTACR(n) (0x40 + ((n) * 4)) |
36 | #define CNTACR_RPCT BIT(0) | |
37 | #define CNTACR_RVCT BIT(1) | |
38 | #define CNTACR_RFRQ BIT(2) | |
39 | #define CNTACR_RVOFF BIT(3) | |
40 | #define CNTACR_RWVT BIT(4) | |
41 | #define CNTACR_RWPT BIT(5) | |
42 | ||
22006994 SB |
43 | #define CNTVCT_LO 0x08 |
44 | #define CNTVCT_HI 0x0c | |
45 | #define CNTFRQ 0x10 | |
46 | #define CNTP_TVAL 0x28 | |
47 | #define CNTP_CTL 0x2c | |
48 | #define CNTV_TVAL 0x38 | |
49 | #define CNTV_CTL 0x3c | |
50 | ||
51 | #define ARCH_CP15_TIMER BIT(0) | |
52 | #define ARCH_MEM_TIMER BIT(1) | |
53 | static unsigned arch_timers_present __initdata; | |
54 | ||
55 | static void __iomem *arch_counter_base; | |
56 | ||
57 | struct arch_timer { | |
58 | void __iomem *base; | |
59 | struct clock_event_device evt; | |
60 | }; | |
61 | ||
62 | #define to_arch_timer(e) container_of(e, struct arch_timer, evt) | |
63 | ||
8a4da6e3 MR |
64 | static u32 arch_timer_rate; |
65 | ||
66 | enum ppi_nr { | |
67 | PHYS_SECURE_PPI, | |
68 | PHYS_NONSECURE_PPI, | |
69 | VIRT_PPI, | |
70 | HYP_PPI, | |
71 | MAX_TIMER_PPI | |
72 | }; | |
73 | ||
74 | static int arch_timer_ppi[MAX_TIMER_PPI]; | |
75 | ||
76 | static struct clock_event_device __percpu *arch_timer_evt; | |
77 | ||
f81f03fa | 78 | static enum ppi_nr arch_timer_uses_ppi = VIRT_PPI; |
82a56194 | 79 | static bool arch_timer_c3stop; |
22006994 | 80 | static bool arch_timer_mem_use_virtual; |
8a4da6e3 MR |
81 | |
82 | /* | |
83 | * Architected system timer support. | |
84 | */ | |
85 | ||
60faddf6 SB |
86 | static __always_inline |
87 | void arch_timer_reg_write(int access, enum arch_timer_reg reg, u32 val, | |
cfb6d656 | 88 | struct clock_event_device *clk) |
60faddf6 | 89 | { |
22006994 SB |
90 | if (access == ARCH_TIMER_MEM_PHYS_ACCESS) { |
91 | struct arch_timer *timer = to_arch_timer(clk); | |
92 | switch (reg) { | |
93 | case ARCH_TIMER_REG_CTRL: | |
94 | writel_relaxed(val, timer->base + CNTP_CTL); | |
95 | break; | |
96 | case ARCH_TIMER_REG_TVAL: | |
97 | writel_relaxed(val, timer->base + CNTP_TVAL); | |
98 | break; | |
99 | } | |
100 | } else if (access == ARCH_TIMER_MEM_VIRT_ACCESS) { | |
101 | struct arch_timer *timer = to_arch_timer(clk); | |
102 | switch (reg) { | |
103 | case ARCH_TIMER_REG_CTRL: | |
104 | writel_relaxed(val, timer->base + CNTV_CTL); | |
105 | break; | |
106 | case ARCH_TIMER_REG_TVAL: | |
107 | writel_relaxed(val, timer->base + CNTV_TVAL); | |
108 | break; | |
109 | } | |
110 | } else { | |
111 | arch_timer_reg_write_cp15(access, reg, val); | |
112 | } | |
60faddf6 SB |
113 | } |
114 | ||
115 | static __always_inline | |
116 | u32 arch_timer_reg_read(int access, enum arch_timer_reg reg, | |
cfb6d656 | 117 | struct clock_event_device *clk) |
60faddf6 | 118 | { |
22006994 SB |
119 | u32 val; |
120 | ||
121 | if (access == ARCH_TIMER_MEM_PHYS_ACCESS) { | |
122 | struct arch_timer *timer = to_arch_timer(clk); | |
123 | switch (reg) { | |
124 | case ARCH_TIMER_REG_CTRL: | |
125 | val = readl_relaxed(timer->base + CNTP_CTL); | |
126 | break; | |
127 | case ARCH_TIMER_REG_TVAL: | |
128 | val = readl_relaxed(timer->base + CNTP_TVAL); | |
129 | break; | |
130 | } | |
131 | } else if (access == ARCH_TIMER_MEM_VIRT_ACCESS) { | |
132 | struct arch_timer *timer = to_arch_timer(clk); | |
133 | switch (reg) { | |
134 | case ARCH_TIMER_REG_CTRL: | |
135 | val = readl_relaxed(timer->base + CNTV_CTL); | |
136 | break; | |
137 | case ARCH_TIMER_REG_TVAL: | |
138 | val = readl_relaxed(timer->base + CNTV_TVAL); | |
139 | break; | |
140 | } | |
141 | } else { | |
142 | val = arch_timer_reg_read_cp15(access, reg); | |
143 | } | |
144 | ||
145 | return val; | |
60faddf6 SB |
146 | } |
147 | ||
e09f3cc0 | 148 | static __always_inline irqreturn_t timer_handler(const int access, |
8a4da6e3 MR |
149 | struct clock_event_device *evt) |
150 | { | |
151 | unsigned long ctrl; | |
cfb6d656 | 152 | |
60faddf6 | 153 | ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL, evt); |
8a4da6e3 MR |
154 | if (ctrl & ARCH_TIMER_CTRL_IT_STAT) { |
155 | ctrl |= ARCH_TIMER_CTRL_IT_MASK; | |
60faddf6 | 156 | arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, evt); |
8a4da6e3 MR |
157 | evt->event_handler(evt); |
158 | return IRQ_HANDLED; | |
159 | } | |
160 | ||
161 | return IRQ_NONE; | |
162 | } | |
163 | ||
164 | static irqreturn_t arch_timer_handler_virt(int irq, void *dev_id) | |
165 | { | |
166 | struct clock_event_device *evt = dev_id; | |
167 | ||
168 | return timer_handler(ARCH_TIMER_VIRT_ACCESS, evt); | |
169 | } | |
170 | ||
171 | static irqreturn_t arch_timer_handler_phys(int irq, void *dev_id) | |
172 | { | |
173 | struct clock_event_device *evt = dev_id; | |
174 | ||
175 | return timer_handler(ARCH_TIMER_PHYS_ACCESS, evt); | |
176 | } | |
177 | ||
22006994 SB |
178 | static irqreturn_t arch_timer_handler_phys_mem(int irq, void *dev_id) |
179 | { | |
180 | struct clock_event_device *evt = dev_id; | |
181 | ||
182 | return timer_handler(ARCH_TIMER_MEM_PHYS_ACCESS, evt); | |
183 | } | |
184 | ||
185 | static irqreturn_t arch_timer_handler_virt_mem(int irq, void *dev_id) | |
186 | { | |
187 | struct clock_event_device *evt = dev_id; | |
188 | ||
189 | return timer_handler(ARCH_TIMER_MEM_VIRT_ACCESS, evt); | |
190 | } | |
191 | ||
46c5bfdd VK |
192 | static __always_inline int timer_shutdown(const int access, |
193 | struct clock_event_device *clk) | |
8a4da6e3 MR |
194 | { |
195 | unsigned long ctrl; | |
46c5bfdd VK |
196 | |
197 | ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL, clk); | |
198 | ctrl &= ~ARCH_TIMER_CTRL_ENABLE; | |
199 | arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, clk); | |
200 | ||
201 | return 0; | |
8a4da6e3 MR |
202 | } |
203 | ||
46c5bfdd | 204 | static int arch_timer_shutdown_virt(struct clock_event_device *clk) |
8a4da6e3 | 205 | { |
46c5bfdd | 206 | return timer_shutdown(ARCH_TIMER_VIRT_ACCESS, clk); |
8a4da6e3 MR |
207 | } |
208 | ||
46c5bfdd | 209 | static int arch_timer_shutdown_phys(struct clock_event_device *clk) |
8a4da6e3 | 210 | { |
46c5bfdd | 211 | return timer_shutdown(ARCH_TIMER_PHYS_ACCESS, clk); |
8a4da6e3 MR |
212 | } |
213 | ||
46c5bfdd | 214 | static int arch_timer_shutdown_virt_mem(struct clock_event_device *clk) |
22006994 | 215 | { |
46c5bfdd | 216 | return timer_shutdown(ARCH_TIMER_MEM_VIRT_ACCESS, clk); |
8a4da6e3 MR |
217 | } |
218 | ||
46c5bfdd | 219 | static int arch_timer_shutdown_phys_mem(struct clock_event_device *clk) |
22006994 | 220 | { |
46c5bfdd | 221 | return timer_shutdown(ARCH_TIMER_MEM_PHYS_ACCESS, clk); |
22006994 SB |
222 | } |
223 | ||
60faddf6 | 224 | static __always_inline void set_next_event(const int access, unsigned long evt, |
cfb6d656 | 225 | struct clock_event_device *clk) |
8a4da6e3 MR |
226 | { |
227 | unsigned long ctrl; | |
60faddf6 | 228 | ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL, clk); |
8a4da6e3 MR |
229 | ctrl |= ARCH_TIMER_CTRL_ENABLE; |
230 | ctrl &= ~ARCH_TIMER_CTRL_IT_MASK; | |
60faddf6 SB |
231 | arch_timer_reg_write(access, ARCH_TIMER_REG_TVAL, evt, clk); |
232 | arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, clk); | |
8a4da6e3 MR |
233 | } |
234 | ||
235 | static int arch_timer_set_next_event_virt(unsigned long evt, | |
60faddf6 | 236 | struct clock_event_device *clk) |
8a4da6e3 | 237 | { |
60faddf6 | 238 | set_next_event(ARCH_TIMER_VIRT_ACCESS, evt, clk); |
8a4da6e3 MR |
239 | return 0; |
240 | } | |
241 | ||
242 | static int arch_timer_set_next_event_phys(unsigned long evt, | |
60faddf6 | 243 | struct clock_event_device *clk) |
8a4da6e3 | 244 | { |
60faddf6 | 245 | set_next_event(ARCH_TIMER_PHYS_ACCESS, evt, clk); |
8a4da6e3 MR |
246 | return 0; |
247 | } | |
248 | ||
22006994 SB |
249 | static int arch_timer_set_next_event_virt_mem(unsigned long evt, |
250 | struct clock_event_device *clk) | |
8a4da6e3 | 251 | { |
22006994 SB |
252 | set_next_event(ARCH_TIMER_MEM_VIRT_ACCESS, evt, clk); |
253 | return 0; | |
254 | } | |
255 | ||
256 | static int arch_timer_set_next_event_phys_mem(unsigned long evt, | |
257 | struct clock_event_device *clk) | |
258 | { | |
259 | set_next_event(ARCH_TIMER_MEM_PHYS_ACCESS, evt, clk); | |
260 | return 0; | |
261 | } | |
262 | ||
cfb6d656 TG |
263 | static void __arch_timer_setup(unsigned type, |
264 | struct clock_event_device *clk) | |
22006994 SB |
265 | { |
266 | clk->features = CLOCK_EVT_FEAT_ONESHOT; | |
267 | ||
268 | if (type == ARCH_CP15_TIMER) { | |
82a56194 LP |
269 | if (arch_timer_c3stop) |
270 | clk->features |= CLOCK_EVT_FEAT_C3STOP; | |
22006994 SB |
271 | clk->name = "arch_sys_timer"; |
272 | clk->rating = 450; | |
273 | clk->cpumask = cpumask_of(smp_processor_id()); | |
f81f03fa MZ |
274 | clk->irq = arch_timer_ppi[arch_timer_uses_ppi]; |
275 | switch (arch_timer_uses_ppi) { | |
276 | case VIRT_PPI: | |
46c5bfdd | 277 | clk->set_state_shutdown = arch_timer_shutdown_virt; |
cf8c5009 | 278 | clk->set_state_oneshot_stopped = arch_timer_shutdown_virt; |
22006994 | 279 | clk->set_next_event = arch_timer_set_next_event_virt; |
f81f03fa MZ |
280 | break; |
281 | case PHYS_SECURE_PPI: | |
282 | case PHYS_NONSECURE_PPI: | |
283 | case HYP_PPI: | |
46c5bfdd | 284 | clk->set_state_shutdown = arch_timer_shutdown_phys; |
cf8c5009 | 285 | clk->set_state_oneshot_stopped = arch_timer_shutdown_phys; |
22006994 | 286 | clk->set_next_event = arch_timer_set_next_event_phys; |
f81f03fa MZ |
287 | break; |
288 | default: | |
289 | BUG(); | |
22006994 | 290 | } |
8a4da6e3 | 291 | } else { |
7b52ad2e | 292 | clk->features |= CLOCK_EVT_FEAT_DYNIRQ; |
22006994 SB |
293 | clk->name = "arch_mem_timer"; |
294 | clk->rating = 400; | |
295 | clk->cpumask = cpu_all_mask; | |
296 | if (arch_timer_mem_use_virtual) { | |
46c5bfdd | 297 | clk->set_state_shutdown = arch_timer_shutdown_virt_mem; |
cf8c5009 | 298 | clk->set_state_oneshot_stopped = arch_timer_shutdown_virt_mem; |
22006994 SB |
299 | clk->set_next_event = |
300 | arch_timer_set_next_event_virt_mem; | |
301 | } else { | |
46c5bfdd | 302 | clk->set_state_shutdown = arch_timer_shutdown_phys_mem; |
cf8c5009 | 303 | clk->set_state_oneshot_stopped = arch_timer_shutdown_phys_mem; |
22006994 SB |
304 | clk->set_next_event = |
305 | arch_timer_set_next_event_phys_mem; | |
306 | } | |
8a4da6e3 MR |
307 | } |
308 | ||
46c5bfdd | 309 | clk->set_state_shutdown(clk); |
8a4da6e3 | 310 | |
22006994 SB |
311 | clockevents_config_and_register(clk, arch_timer_rate, 0xf, 0x7fffffff); |
312 | } | |
8a4da6e3 | 313 | |
e1ce5c7a NL |
314 | static void arch_timer_evtstrm_enable(int divider) |
315 | { | |
316 | u32 cntkctl = arch_timer_get_cntkctl(); | |
317 | ||
318 | cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK; | |
319 | /* Set the divider and enable virtual event stream */ | |
320 | cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT) | |
321 | | ARCH_TIMER_VIRT_EVT_EN; | |
322 | arch_timer_set_cntkctl(cntkctl); | |
323 | elf_hwcap |= HWCAP_EVTSTRM; | |
324 | #ifdef CONFIG_COMPAT | |
325 | compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM; | |
326 | #endif | |
327 | } | |
328 | ||
037f6377 WD |
329 | static void arch_timer_configure_evtstream(void) |
330 | { | |
331 | int evt_stream_div, pos; | |
332 | ||
333 | /* Find the closest power of two to the divisor */ | |
334 | evt_stream_div = arch_timer_rate / ARCH_TIMER_EVT_STREAM_FREQ; | |
335 | pos = fls(evt_stream_div); | |
336 | if (pos > 1 && !(evt_stream_div & (1 << (pos - 2)))) | |
337 | pos--; | |
338 | /* enable event stream */ | |
339 | arch_timer_evtstrm_enable(min(pos, 15)); | |
340 | } | |
341 | ||
8b8dde00 NL |
342 | static void arch_counter_set_user_access(void) |
343 | { | |
344 | u32 cntkctl = arch_timer_get_cntkctl(); | |
345 | ||
346 | /* Disable user access to the timers and the physical counter */ | |
347 | /* Also disable virtual event stream */ | |
348 | cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN | |
349 | | ARCH_TIMER_USR_VT_ACCESS_EN | |
350 | | ARCH_TIMER_VIRT_EVT_EN | |
351 | | ARCH_TIMER_USR_PCT_ACCESS_EN); | |
352 | ||
353 | /* Enable user access to the virtual counter */ | |
354 | cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN; | |
355 | ||
356 | arch_timer_set_cntkctl(cntkctl); | |
357 | } | |
358 | ||
f81f03fa MZ |
359 | static bool arch_timer_has_nonsecure_ppi(void) |
360 | { | |
361 | return (arch_timer_uses_ppi == PHYS_SECURE_PPI && | |
362 | arch_timer_ppi[PHYS_NONSECURE_PPI]); | |
363 | } | |
364 | ||
cfb6d656 | 365 | static int arch_timer_setup(struct clock_event_device *clk) |
22006994 SB |
366 | { |
367 | __arch_timer_setup(ARCH_CP15_TIMER, clk); | |
8a4da6e3 | 368 | |
f81f03fa MZ |
369 | enable_percpu_irq(arch_timer_ppi[arch_timer_uses_ppi], 0); |
370 | ||
371 | if (arch_timer_has_nonsecure_ppi()) | |
372 | enable_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI], 0); | |
8a4da6e3 MR |
373 | |
374 | arch_counter_set_user_access(); | |
037f6377 WD |
375 | if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER_EVTSTREAM)) |
376 | arch_timer_configure_evtstream(); | |
8a4da6e3 MR |
377 | |
378 | return 0; | |
379 | } | |
380 | ||
22006994 SB |
381 | static void |
382 | arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) | |
8a4da6e3 | 383 | { |
22006994 SB |
384 | /* Who has more than one independent system counter? */ |
385 | if (arch_timer_rate) | |
386 | return; | |
8a4da6e3 | 387 | |
b09ca1ec HG |
388 | /* |
389 | * Try to determine the frequency from the device tree or CNTFRQ, | |
390 | * if ACPI is enabled, get the frequency from CNTFRQ ONLY. | |
391 | */ | |
392 | if (!acpi_disabled || | |
393 | of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { | |
22006994 SB |
394 | if (cntbase) |
395 | arch_timer_rate = readl_relaxed(cntbase + CNTFRQ); | |
396 | else | |
397 | arch_timer_rate = arch_timer_get_cntfrq(); | |
8a4da6e3 MR |
398 | } |
399 | ||
22006994 SB |
400 | /* Check the timer frequency. */ |
401 | if (arch_timer_rate == 0) | |
402 | pr_warn("Architected timer frequency not available\n"); | |
403 | } | |
404 | ||
405 | static void arch_timer_banner(unsigned type) | |
406 | { | |
407 | pr_info("Architected %s%s%s timer(s) running at %lu.%02luMHz (%s%s%s).\n", | |
408 | type & ARCH_CP15_TIMER ? "cp15" : "", | |
409 | type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? " and " : "", | |
410 | type & ARCH_MEM_TIMER ? "mmio" : "", | |
8a4da6e3 MR |
411 | (unsigned long)arch_timer_rate / 1000000, |
412 | (unsigned long)(arch_timer_rate / 10000) % 100, | |
22006994 | 413 | type & ARCH_CP15_TIMER ? |
f81f03fa | 414 | (arch_timer_uses_ppi == VIRT_PPI) ? "virt" : "phys" : |
22006994 SB |
415 | "", |
416 | type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? "/" : "", | |
417 | type & ARCH_MEM_TIMER ? | |
418 | arch_timer_mem_use_virtual ? "virt" : "phys" : | |
419 | ""); | |
8a4da6e3 MR |
420 | } |
421 | ||
422 | u32 arch_timer_get_rate(void) | |
423 | { | |
424 | return arch_timer_rate; | |
425 | } | |
426 | ||
22006994 | 427 | static u64 arch_counter_get_cntvct_mem(void) |
8a4da6e3 | 428 | { |
22006994 SB |
429 | u32 vct_lo, vct_hi, tmp_hi; |
430 | ||
431 | do { | |
432 | vct_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); | |
433 | vct_lo = readl_relaxed(arch_counter_base + CNTVCT_LO); | |
434 | tmp_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); | |
435 | } while (vct_hi != tmp_hi); | |
436 | ||
437 | return ((u64) vct_hi << 32) | vct_lo; | |
8a4da6e3 MR |
438 | } |
439 | ||
22006994 SB |
440 | /* |
441 | * Default to cp15 based access because arm64 uses this function for | |
442 | * sched_clock() before DT is probed and the cp15 method is guaranteed | |
443 | * to exist on arm64. arm doesn't use this before DT is probed so even | |
444 | * if we don't have the cp15 accessors we won't have a problem. | |
445 | */ | |
446 | u64 (*arch_timer_read_counter)(void) = arch_counter_get_cntvct; | |
447 | ||
8a4da6e3 MR |
448 | static cycle_t arch_counter_read(struct clocksource *cs) |
449 | { | |
22006994 | 450 | return arch_timer_read_counter(); |
8a4da6e3 MR |
451 | } |
452 | ||
453 | static cycle_t arch_counter_read_cc(const struct cyclecounter *cc) | |
454 | { | |
22006994 | 455 | return arch_timer_read_counter(); |
8a4da6e3 MR |
456 | } |
457 | ||
458 | static struct clocksource clocksource_counter = { | |
459 | .name = "arch_sys_counter", | |
460 | .rating = 400, | |
461 | .read = arch_counter_read, | |
462 | .mask = CLOCKSOURCE_MASK(56), | |
4fbcdc81 | 463 | .flags = CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_SUSPEND_NONSTOP, |
8a4da6e3 MR |
464 | }; |
465 | ||
466 | static struct cyclecounter cyclecounter = { | |
467 | .read = arch_counter_read_cc, | |
468 | .mask = CLOCKSOURCE_MASK(56), | |
469 | }; | |
470 | ||
471 | static struct timecounter timecounter; | |
472 | ||
473 | struct timecounter *arch_timer_get_timecounter(void) | |
474 | { | |
475 | return &timecounter; | |
476 | } | |
477 | ||
22006994 SB |
478 | static void __init arch_counter_register(unsigned type) |
479 | { | |
480 | u64 start_count; | |
481 | ||
482 | /* Register the CP15 based counter if we have one */ | |
423bd69e | 483 | if (type & ARCH_CP15_TIMER) { |
f81f03fa | 484 | if (IS_ENABLED(CONFIG_ARM64) || arch_timer_uses_ppi == VIRT_PPI) |
0b46b8a7 SR |
485 | arch_timer_read_counter = arch_counter_get_cntvct; |
486 | else | |
487 | arch_timer_read_counter = arch_counter_get_cntpct; | |
423bd69e | 488 | } else { |
22006994 SB |
489 | arch_timer_read_counter = arch_counter_get_cntvct_mem; |
490 | ||
423bd69e NL |
491 | /* If the clocksource name is "arch_sys_counter" the |
492 | * VDSO will attempt to read the CP15-based counter. | |
493 | * Ensure this does not happen when CP15-based | |
494 | * counter is not available. | |
495 | */ | |
496 | clocksource_counter.name = "arch_mem_counter"; | |
497 | } | |
498 | ||
22006994 SB |
499 | start_count = arch_timer_read_counter(); |
500 | clocksource_register_hz(&clocksource_counter, arch_timer_rate); | |
501 | cyclecounter.mult = clocksource_counter.mult; | |
502 | cyclecounter.shift = clocksource_counter.shift; | |
503 | timecounter_init(&timecounter, &cyclecounter, start_count); | |
4a7d3e8a TR |
504 | |
505 | /* 56 bits minimum, so we assume worst case rollover */ | |
506 | sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate); | |
22006994 SB |
507 | } |
508 | ||
8c37bb3a | 509 | static void arch_timer_stop(struct clock_event_device *clk) |
8a4da6e3 MR |
510 | { |
511 | pr_debug("arch_timer_teardown disable IRQ%d cpu #%d\n", | |
512 | clk->irq, smp_processor_id()); | |
513 | ||
f81f03fa MZ |
514 | disable_percpu_irq(arch_timer_ppi[arch_timer_uses_ppi]); |
515 | if (arch_timer_has_nonsecure_ppi()) | |
516 | disable_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI]); | |
8a4da6e3 | 517 | |
46c5bfdd | 518 | clk->set_state_shutdown(clk); |
8a4da6e3 MR |
519 | } |
520 | ||
8c37bb3a | 521 | static int arch_timer_cpu_notify(struct notifier_block *self, |
8a4da6e3 MR |
522 | unsigned long action, void *hcpu) |
523 | { | |
f31c2f1c SB |
524 | /* |
525 | * Grab cpu pointer in each case to avoid spurious | |
526 | * preemptible warnings | |
527 | */ | |
8a4da6e3 MR |
528 | switch (action & ~CPU_TASKS_FROZEN) { |
529 | case CPU_STARTING: | |
f31c2f1c | 530 | arch_timer_setup(this_cpu_ptr(arch_timer_evt)); |
8a4da6e3 MR |
531 | break; |
532 | case CPU_DYING: | |
f31c2f1c | 533 | arch_timer_stop(this_cpu_ptr(arch_timer_evt)); |
8a4da6e3 MR |
534 | break; |
535 | } | |
536 | ||
537 | return NOTIFY_OK; | |
538 | } | |
539 | ||
8c37bb3a | 540 | static struct notifier_block arch_timer_cpu_nb = { |
8a4da6e3 MR |
541 | .notifier_call = arch_timer_cpu_notify, |
542 | }; | |
543 | ||
346e7480 SK |
544 | #ifdef CONFIG_CPU_PM |
545 | static unsigned int saved_cntkctl; | |
546 | static int arch_timer_cpu_pm_notify(struct notifier_block *self, | |
547 | unsigned long action, void *hcpu) | |
548 | { | |
549 | if (action == CPU_PM_ENTER) | |
550 | saved_cntkctl = arch_timer_get_cntkctl(); | |
551 | else if (action == CPU_PM_ENTER_FAILED || action == CPU_PM_EXIT) | |
552 | arch_timer_set_cntkctl(saved_cntkctl); | |
553 | return NOTIFY_OK; | |
554 | } | |
555 | ||
556 | static struct notifier_block arch_timer_cpu_pm_notifier = { | |
557 | .notifier_call = arch_timer_cpu_pm_notify, | |
558 | }; | |
559 | ||
560 | static int __init arch_timer_cpu_pm_init(void) | |
561 | { | |
562 | return cpu_pm_register_notifier(&arch_timer_cpu_pm_notifier); | |
563 | } | |
564 | #else | |
565 | static int __init arch_timer_cpu_pm_init(void) | |
566 | { | |
567 | return 0; | |
568 | } | |
569 | #endif | |
570 | ||
8a4da6e3 MR |
571 | static int __init arch_timer_register(void) |
572 | { | |
573 | int err; | |
574 | int ppi; | |
575 | ||
8a4da6e3 MR |
576 | arch_timer_evt = alloc_percpu(struct clock_event_device); |
577 | if (!arch_timer_evt) { | |
578 | err = -ENOMEM; | |
579 | goto out; | |
580 | } | |
581 | ||
f81f03fa MZ |
582 | ppi = arch_timer_ppi[arch_timer_uses_ppi]; |
583 | switch (arch_timer_uses_ppi) { | |
584 | case VIRT_PPI: | |
8a4da6e3 MR |
585 | err = request_percpu_irq(ppi, arch_timer_handler_virt, |
586 | "arch_timer", arch_timer_evt); | |
f81f03fa MZ |
587 | break; |
588 | case PHYS_SECURE_PPI: | |
589 | case PHYS_NONSECURE_PPI: | |
8a4da6e3 MR |
590 | err = request_percpu_irq(ppi, arch_timer_handler_phys, |
591 | "arch_timer", arch_timer_evt); | |
592 | if (!err && arch_timer_ppi[PHYS_NONSECURE_PPI]) { | |
593 | ppi = arch_timer_ppi[PHYS_NONSECURE_PPI]; | |
594 | err = request_percpu_irq(ppi, arch_timer_handler_phys, | |
595 | "arch_timer", arch_timer_evt); | |
596 | if (err) | |
597 | free_percpu_irq(arch_timer_ppi[PHYS_SECURE_PPI], | |
598 | arch_timer_evt); | |
599 | } | |
f81f03fa MZ |
600 | break; |
601 | case HYP_PPI: | |
602 | err = request_percpu_irq(ppi, arch_timer_handler_phys, | |
603 | "arch_timer", arch_timer_evt); | |
604 | break; | |
605 | default: | |
606 | BUG(); | |
8a4da6e3 MR |
607 | } |
608 | ||
609 | if (err) { | |
610 | pr_err("arch_timer: can't register interrupt %d (%d)\n", | |
611 | ppi, err); | |
612 | goto out_free; | |
613 | } | |
614 | ||
615 | err = register_cpu_notifier(&arch_timer_cpu_nb); | |
616 | if (err) | |
617 | goto out_free_irq; | |
618 | ||
346e7480 SK |
619 | err = arch_timer_cpu_pm_init(); |
620 | if (err) | |
621 | goto out_unreg_notify; | |
622 | ||
8a4da6e3 MR |
623 | /* Immediately configure the timer on the boot CPU */ |
624 | arch_timer_setup(this_cpu_ptr(arch_timer_evt)); | |
625 | ||
626 | return 0; | |
627 | ||
346e7480 SK |
628 | out_unreg_notify: |
629 | unregister_cpu_notifier(&arch_timer_cpu_nb); | |
8a4da6e3 | 630 | out_free_irq: |
f81f03fa MZ |
631 | free_percpu_irq(arch_timer_ppi[arch_timer_uses_ppi], arch_timer_evt); |
632 | if (arch_timer_has_nonsecure_ppi()) | |
633 | free_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI], | |
8a4da6e3 | 634 | arch_timer_evt); |
8a4da6e3 MR |
635 | |
636 | out_free: | |
637 | free_percpu(arch_timer_evt); | |
638 | out: | |
639 | return err; | |
640 | } | |
641 | ||
22006994 SB |
642 | static int __init arch_timer_mem_register(void __iomem *base, unsigned int irq) |
643 | { | |
644 | int ret; | |
645 | irq_handler_t func; | |
646 | struct arch_timer *t; | |
647 | ||
648 | t = kzalloc(sizeof(*t), GFP_KERNEL); | |
649 | if (!t) | |
650 | return -ENOMEM; | |
651 | ||
652 | t->base = base; | |
653 | t->evt.irq = irq; | |
654 | __arch_timer_setup(ARCH_MEM_TIMER, &t->evt); | |
655 | ||
656 | if (arch_timer_mem_use_virtual) | |
657 | func = arch_timer_handler_virt_mem; | |
658 | else | |
659 | func = arch_timer_handler_phys_mem; | |
660 | ||
661 | ret = request_irq(irq, func, IRQF_TIMER, "arch_mem_timer", &t->evt); | |
662 | if (ret) { | |
663 | pr_err("arch_timer: Failed to request mem timer irq\n"); | |
664 | kfree(t); | |
665 | } | |
666 | ||
667 | return ret; | |
668 | } | |
669 | ||
670 | static const struct of_device_id arch_timer_of_match[] __initconst = { | |
671 | { .compatible = "arm,armv7-timer", }, | |
672 | { .compatible = "arm,armv8-timer", }, | |
673 | {}, | |
674 | }; | |
675 | ||
676 | static const struct of_device_id arch_timer_mem_of_match[] __initconst = { | |
677 | { .compatible = "arm,armv7-timer-mem", }, | |
678 | {}, | |
679 | }; | |
680 | ||
c387f07e | 681 | static bool __init |
566e6dfa | 682 | arch_timer_needs_probing(int type, const struct of_device_id *matches) |
c387f07e SH |
683 | { |
684 | struct device_node *dn; | |
566e6dfa | 685 | bool needs_probing = false; |
c387f07e SH |
686 | |
687 | dn = of_find_matching_node(NULL, matches); | |
59aa896d | 688 | if (dn && of_device_is_available(dn) && !(arch_timers_present & type)) |
566e6dfa | 689 | needs_probing = true; |
c387f07e SH |
690 | of_node_put(dn); |
691 | ||
566e6dfa | 692 | return needs_probing; |
c387f07e SH |
693 | } |
694 | ||
22006994 SB |
695 | static void __init arch_timer_common_init(void) |
696 | { | |
697 | unsigned mask = ARCH_CP15_TIMER | ARCH_MEM_TIMER; | |
698 | ||
699 | /* Wait until both nodes are probed if we have two timers */ | |
700 | if ((arch_timers_present & mask) != mask) { | |
566e6dfa | 701 | if (arch_timer_needs_probing(ARCH_MEM_TIMER, arch_timer_mem_of_match)) |
22006994 | 702 | return; |
566e6dfa | 703 | if (arch_timer_needs_probing(ARCH_CP15_TIMER, arch_timer_of_match)) |
22006994 SB |
704 | return; |
705 | } | |
706 | ||
707 | arch_timer_banner(arch_timers_present); | |
708 | arch_counter_register(arch_timers_present); | |
709 | arch_timer_arch_init(); | |
710 | } | |
711 | ||
b09ca1ec | 712 | static void __init arch_timer_init(void) |
8a4da6e3 | 713 | { |
8a4da6e3 | 714 | /* |
8266891e MZ |
715 | * If HYP mode is available, we know that the physical timer |
716 | * has been configured to be accessible from PL1. Use it, so | |
717 | * that a guest can use the virtual timer instead. | |
718 | * | |
8a4da6e3 MR |
719 | * If no interrupt provided for virtual timer, we'll have to |
720 | * stick to the physical timer. It'd better be accessible... | |
f81f03fa MZ |
721 | * |
722 | * On ARMv8.1 with VH extensions, the kernel runs in HYP. VHE | |
723 | * accesses to CNTP_*_EL1 registers are silently redirected to | |
724 | * their CNTHP_*_EL2 counterparts, and use a different PPI | |
725 | * number. | |
8a4da6e3 | 726 | */ |
8266891e | 727 | if (is_hyp_mode_available() || !arch_timer_ppi[VIRT_PPI]) { |
f81f03fa MZ |
728 | bool has_ppi; |
729 | ||
730 | if (is_kernel_in_hyp_mode()) { | |
731 | arch_timer_uses_ppi = HYP_PPI; | |
732 | has_ppi = !!arch_timer_ppi[HYP_PPI]; | |
733 | } else { | |
734 | arch_timer_uses_ppi = PHYS_SECURE_PPI; | |
735 | has_ppi = (!!arch_timer_ppi[PHYS_SECURE_PPI] || | |
736 | !!arch_timer_ppi[PHYS_NONSECURE_PPI]); | |
737 | } | |
8a4da6e3 | 738 | |
f81f03fa | 739 | if (!has_ppi) { |
8a4da6e3 | 740 | pr_warn("arch_timer: No interrupt available, giving up\n"); |
0583fe47 | 741 | return; |
8a4da6e3 MR |
742 | } |
743 | } | |
744 | ||
0583fe47 | 745 | arch_timer_register(); |
22006994 | 746 | arch_timer_common_init(); |
8a4da6e3 | 747 | } |
b09ca1ec HG |
748 | |
749 | static void __init arch_timer_of_init(struct device_node *np) | |
750 | { | |
751 | int i; | |
752 | ||
753 | if (arch_timers_present & ARCH_CP15_TIMER) { | |
754 | pr_warn("arch_timer: multiple nodes in dt, skipping\n"); | |
755 | return; | |
756 | } | |
757 | ||
758 | arch_timers_present |= ARCH_CP15_TIMER; | |
759 | for (i = PHYS_SECURE_PPI; i < MAX_TIMER_PPI; i++) | |
760 | arch_timer_ppi[i] = irq_of_parse_and_map(np, i); | |
761 | ||
762 | arch_timer_detect_rate(NULL, np); | |
763 | ||
764 | arch_timer_c3stop = !of_property_read_bool(np, "always-on"); | |
765 | ||
766 | /* | |
767 | * If we cannot rely on firmware initializing the timer registers then | |
768 | * we should use the physical timers instead. | |
769 | */ | |
770 | if (IS_ENABLED(CONFIG_ARM) && | |
771 | of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) | |
f81f03fa | 772 | arch_timer_uses_ppi = PHYS_SECURE_PPI; |
b09ca1ec HG |
773 | |
774 | arch_timer_init(); | |
775 | } | |
776 | CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_of_init); | |
777 | CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_of_init); | |
22006994 SB |
778 | |
779 | static void __init arch_timer_mem_init(struct device_node *np) | |
780 | { | |
781 | struct device_node *frame, *best_frame = NULL; | |
782 | void __iomem *cntctlbase, *base; | |
783 | unsigned int irq; | |
784 | u32 cnttidr; | |
785 | ||
786 | arch_timers_present |= ARCH_MEM_TIMER; | |
787 | cntctlbase = of_iomap(np, 0); | |
788 | if (!cntctlbase) { | |
789 | pr_err("arch_timer: Can't find CNTCTLBase\n"); | |
790 | return; | |
791 | } | |
792 | ||
793 | cnttidr = readl_relaxed(cntctlbase + CNTTIDR); | |
22006994 SB |
794 | |
795 | /* | |
796 | * Try to find a virtual capable frame. Otherwise fall back to a | |
797 | * physical capable frame. | |
798 | */ | |
799 | for_each_available_child_of_node(np, frame) { | |
800 | int n; | |
e392d603 | 801 | u32 cntacr; |
22006994 SB |
802 | |
803 | if (of_property_read_u32(frame, "frame-number", &n)) { | |
804 | pr_err("arch_timer: Missing frame-number\n"); | |
22006994 | 805 | of_node_put(frame); |
e392d603 | 806 | goto out; |
22006994 SB |
807 | } |
808 | ||
e392d603 RM |
809 | /* Try enabling everything, and see what sticks */ |
810 | cntacr = CNTACR_RFRQ | CNTACR_RWPT | CNTACR_RPCT | | |
811 | CNTACR_RWVT | CNTACR_RVOFF | CNTACR_RVCT; | |
812 | writel_relaxed(cntacr, cntctlbase + CNTACR(n)); | |
813 | cntacr = readl_relaxed(cntctlbase + CNTACR(n)); | |
814 | ||
815 | if ((cnttidr & CNTTIDR_VIRT(n)) && | |
816 | !(~cntacr & (CNTACR_RWVT | CNTACR_RVCT))) { | |
22006994 SB |
817 | of_node_put(best_frame); |
818 | best_frame = frame; | |
819 | arch_timer_mem_use_virtual = true; | |
820 | break; | |
821 | } | |
e392d603 RM |
822 | |
823 | if (~cntacr & (CNTACR_RWPT | CNTACR_RPCT)) | |
824 | continue; | |
825 | ||
22006994 SB |
826 | of_node_put(best_frame); |
827 | best_frame = of_node_get(frame); | |
828 | } | |
829 | ||
830 | base = arch_counter_base = of_iomap(best_frame, 0); | |
831 | if (!base) { | |
832 | pr_err("arch_timer: Can't map frame's registers\n"); | |
e392d603 | 833 | goto out; |
22006994 SB |
834 | } |
835 | ||
836 | if (arch_timer_mem_use_virtual) | |
837 | irq = irq_of_parse_and_map(best_frame, 1); | |
838 | else | |
839 | irq = irq_of_parse_and_map(best_frame, 0); | |
e392d603 | 840 | |
22006994 SB |
841 | if (!irq) { |
842 | pr_err("arch_timer: Frame missing %s irq", | |
cfb6d656 | 843 | arch_timer_mem_use_virtual ? "virt" : "phys"); |
e392d603 | 844 | goto out; |
22006994 SB |
845 | } |
846 | ||
847 | arch_timer_detect_rate(base, np); | |
848 | arch_timer_mem_register(base, irq); | |
849 | arch_timer_common_init(); | |
e392d603 RM |
850 | out: |
851 | iounmap(cntctlbase); | |
852 | of_node_put(best_frame); | |
22006994 SB |
853 | } |
854 | CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem", | |
855 | arch_timer_mem_init); | |
b09ca1ec HG |
856 | |
857 | #ifdef CONFIG_ACPI | |
858 | static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags) | |
859 | { | |
860 | int trigger, polarity; | |
861 | ||
862 | if (!interrupt) | |
863 | return 0; | |
864 | ||
865 | trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE | |
866 | : ACPI_LEVEL_SENSITIVE; | |
867 | ||
868 | polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW | |
869 | : ACPI_ACTIVE_HIGH; | |
870 | ||
871 | return acpi_register_gsi(NULL, interrupt, trigger, polarity); | |
872 | } | |
873 | ||
874 | /* Initialize per-processor generic timer */ | |
875 | static int __init arch_timer_acpi_init(struct acpi_table_header *table) | |
876 | { | |
877 | struct acpi_table_gtdt *gtdt; | |
878 | ||
879 | if (arch_timers_present & ARCH_CP15_TIMER) { | |
880 | pr_warn("arch_timer: already initialized, skipping\n"); | |
881 | return -EINVAL; | |
882 | } | |
883 | ||
884 | gtdt = container_of(table, struct acpi_table_gtdt, header); | |
885 | ||
886 | arch_timers_present |= ARCH_CP15_TIMER; | |
887 | ||
888 | arch_timer_ppi[PHYS_SECURE_PPI] = | |
889 | map_generic_timer_interrupt(gtdt->secure_el1_interrupt, | |
890 | gtdt->secure_el1_flags); | |
891 | ||
892 | arch_timer_ppi[PHYS_NONSECURE_PPI] = | |
893 | map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt, | |
894 | gtdt->non_secure_el1_flags); | |
895 | ||
896 | arch_timer_ppi[VIRT_PPI] = | |
897 | map_generic_timer_interrupt(gtdt->virtual_timer_interrupt, | |
898 | gtdt->virtual_timer_flags); | |
899 | ||
900 | arch_timer_ppi[HYP_PPI] = | |
901 | map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt, | |
902 | gtdt->non_secure_el2_flags); | |
903 | ||
904 | /* Get the frequency from CNTFRQ */ | |
905 | arch_timer_detect_rate(NULL, NULL); | |
906 | ||
907 | /* Always-on capability */ | |
908 | arch_timer_c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); | |
909 | ||
910 | arch_timer_init(); | |
911 | return 0; | |
912 | } | |
ae281cbd | 913 | CLOCKSOURCE_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init); |
b09ca1ec | 914 | #endif |