Commit | Line | Data |
---|---|---|
99e6a4d2 RN |
1 | /* |
2 | * linux/arch/arm/mach-omap2/cpuidle34xx.c | |
3 | * | |
4 | * OMAP3 CPU IDLE Routines | |
5 | * | |
6 | * Copyright (C) 2008 Texas Instruments, Inc. | |
7 | * Rajendra Nayak <rnayak@ti.com> | |
8 | * | |
9 | * Copyright (C) 2007 Texas Instruments, Inc. | |
10 | * Karthik Dasu <karthik-dp@ti.com> | |
11 | * | |
12 | * Copyright (C) 2006 Nokia Corporation | |
13 | * Tony Lindgren <tony@atomide.com> | |
14 | * | |
15 | * Copyright (C) 2005 Texas Instruments, Inc. | |
16 | * Richard Woodruff <r-woodruff2@ti.com> | |
17 | * | |
18 | * Based on pm.c for omap2 | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License version 2 as | |
22 | * published by the Free Software Foundation. | |
23 | */ | |
24 | ||
cf22854c | 25 | #include <linux/sched.h> |
99e6a4d2 | 26 | #include <linux/cpuidle.h> |
5698eb4e | 27 | #include <linux/export.h> |
99e6a4d2 RN |
28 | |
29 | #include <plat/prcm.h> | |
20b01669 | 30 | #include <plat/irqs.h> |
72e06d08 | 31 | #include "powerdomain.h" |
1540f214 | 32 | #include "clockdomain.h" |
0f724ed9 | 33 | #include <plat/serial.h> |
99e6a4d2 | 34 | |
c98e2230 | 35 | #include "pm.h" |
4814ced5 | 36 | #include "control.h" |
c98e2230 | 37 | |
99e6a4d2 RN |
38 | #ifdef CONFIG_CPU_IDLE |
39 | ||
bb4de3df KH |
40 | /* |
41 | * The latencies/thresholds for various C states have | |
42 | * to be configured from the respective board files. | |
43 | * These are some default values (which might not provide | |
44 | * the best power savings) used on boards which do not | |
45 | * pass these details from the board file. | |
46 | */ | |
47 | static struct cpuidle_params cpuidle_params_table[] = { | |
48 | /* C1 */ | |
866ba0ef | 49 | {2 + 2, 5, 1}, |
bb4de3df | 50 | /* C2 */ |
866ba0ef | 51 | {10 + 10, 30, 1}, |
bb4de3df | 52 | /* C3 */ |
866ba0ef | 53 | {50 + 50, 300, 1}, |
bb4de3df | 54 | /* C4 */ |
866ba0ef | 55 | {1500 + 1800, 4000, 1}, |
bb4de3df | 56 | /* C5 */ |
866ba0ef | 57 | {2500 + 7500, 12000, 1}, |
bb4de3df | 58 | /* C6 */ |
866ba0ef | 59 | {3000 + 8500, 15000, 1}, |
bb4de3df | 60 | /* C7 */ |
866ba0ef | 61 | {10000 + 30000, 300000, 1}, |
bb4de3df | 62 | }; |
badc303a JP |
63 | #define OMAP3_NUM_STATES ARRAY_SIZE(cpuidle_params_table) |
64 | ||
65 | /* Mach specific information to be recorded in the C-state driver_data */ | |
66 | struct omap3_idle_statedata { | |
67 | u32 mpu_state; | |
68 | u32 core_state; | |
69 | u8 valid; | |
70 | }; | |
71 | struct omap3_idle_statedata omap3_idle_data[OMAP3_NUM_STATES]; | |
72 | ||
73 | struct powerdomain *mpu_pd, *core_pd, *per_pd, *cam_pd; | |
bb4de3df | 74 | |
06d8f065 PDS |
75 | static int _cpuidle_allow_idle(struct powerdomain *pwrdm, |
76 | struct clockdomain *clkdm) | |
77 | { | |
5cd1937b | 78 | clkdm_allow_idle(clkdm); |
06d8f065 PDS |
79 | return 0; |
80 | } | |
81 | ||
82 | static int _cpuidle_deny_idle(struct powerdomain *pwrdm, | |
83 | struct clockdomain *clkdm) | |
84 | { | |
5cd1937b | 85 | clkdm_deny_idle(clkdm); |
06d8f065 PDS |
86 | return 0; |
87 | } | |
88 | ||
99e6a4d2 RN |
89 | /** |
90 | * omap3_enter_idle - Programs OMAP3 to enter the specified state | |
91 | * @dev: cpuidle device | |
46bcfad7 | 92 | * @drv: cpuidle driver |
e978aa7d | 93 | * @index: the index of state to be entered |
99e6a4d2 RN |
94 | * |
95 | * Called from the CPUidle framework to program the device to the | |
96 | * specified target state selected by the governor. | |
97 | */ | |
98 | static int omap3_enter_idle(struct cpuidle_device *dev, | |
46bcfad7 | 99 | struct cpuidle_driver *drv, |
e978aa7d | 100 | int index) |
99e6a4d2 | 101 | { |
e978aa7d | 102 | struct omap3_idle_statedata *cx = |
4202735e | 103 | cpuidle_get_statedata(&dev->states_usage[index]); |
99e6a4d2 | 104 | struct timespec ts_preidle, ts_postidle, ts_idle; |
c98e2230 | 105 | u32 mpu_state = cx->mpu_state, core_state = cx->core_state; |
e978aa7d | 106 | int idle_time; |
99e6a4d2 | 107 | |
99e6a4d2 RN |
108 | /* Used to keep track of the total time in idle */ |
109 | getnstimeofday(&ts_preidle); | |
110 | ||
111 | local_irq_disable(); | |
112 | local_fiq_disable(); | |
113 | ||
7139178e JH |
114 | pwrdm_set_next_pwrst(mpu_pd, mpu_state); |
115 | pwrdm_set_next_pwrst(core_pd, core_state); | |
20b01669 | 116 | |
cf22854c | 117 | if (omap_irq_pending() || need_resched()) |
20b01669 | 118 | goto return_sleep_time; |
99e6a4d2 | 119 | |
badc303a | 120 | /* Deny idle for C1 */ |
e978aa7d | 121 | if (index == 0) { |
06d8f065 PDS |
122 | pwrdm_for_each_clkdm(mpu_pd, _cpuidle_deny_idle); |
123 | pwrdm_for_each_clkdm(core_pd, _cpuidle_deny_idle); | |
124 | } | |
125 | ||
99e6a4d2 RN |
126 | /* Execute ARM wfi */ |
127 | omap_sram_idle(); | |
128 | ||
badc303a | 129 | /* Re-allow idle for C1 */ |
e978aa7d | 130 | if (index == 0) { |
06d8f065 PDS |
131 | pwrdm_for_each_clkdm(mpu_pd, _cpuidle_allow_idle); |
132 | pwrdm_for_each_clkdm(core_pd, _cpuidle_allow_idle); | |
133 | } | |
134 | ||
20b01669 | 135 | return_sleep_time: |
99e6a4d2 RN |
136 | getnstimeofday(&ts_postidle); |
137 | ts_idle = timespec_sub(ts_postidle, ts_preidle); | |
138 | ||
139 | local_irq_enable(); | |
140 | local_fiq_enable(); | |
141 | ||
e978aa7d DD |
142 | idle_time = ts_idle.tv_nsec / NSEC_PER_USEC + ts_idle.tv_sec * \ |
143 | USEC_PER_SEC; | |
144 | ||
145 | /* Update cpuidle counters */ | |
146 | dev->last_residency = idle_time; | |
147 | ||
148 | return index; | |
99e6a4d2 RN |
149 | } |
150 | ||
6af83b38 | 151 | /** |
04908918 | 152 | * next_valid_state - Find next valid C-state |
6af83b38 | 153 | * @dev: cpuidle device |
46bcfad7 | 154 | * @drv: cpuidle driver |
e978aa7d | 155 | * @index: Index of currently selected c-state |
6af83b38 | 156 | * |
e978aa7d DD |
157 | * If the state corresponding to index is valid, index is returned back |
158 | * to the caller. Else, this function searches for a lower c-state which is | |
159 | * still valid (as defined in omap3_power_states[]) and returns its index. | |
04908918 JP |
160 | * |
161 | * A state is valid if the 'valid' field is enabled and | |
162 | * if it satisfies the enable_off_mode condition. | |
6af83b38 | 163 | */ |
e978aa7d | 164 | static int next_valid_state(struct cpuidle_device *dev, |
46bcfad7 | 165 | struct cpuidle_driver *drv, |
e978aa7d | 166 | int index) |
6af83b38 | 167 | { |
4202735e | 168 | struct cpuidle_state_usage *curr_usage = &dev->states_usage[index]; |
46bcfad7 | 169 | struct cpuidle_state *curr = &drv->states[index]; |
4202735e | 170 | struct omap3_idle_statedata *cx = cpuidle_get_statedata(curr_usage); |
04908918 JP |
171 | u32 mpu_deepest_state = PWRDM_POWER_RET; |
172 | u32 core_deepest_state = PWRDM_POWER_RET; | |
e978aa7d | 173 | int next_index = -1; |
04908918 JP |
174 | |
175 | if (enable_off_mode) { | |
176 | mpu_deepest_state = PWRDM_POWER_OFF; | |
177 | /* | |
178 | * Erratum i583: valable for ES rev < Es1.2 on 3630. | |
179 | * CORE OFF mode is not supported in a stable form, restrict | |
180 | * instead the CORE state to RET. | |
181 | */ | |
182 | if (!IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583)) | |
183 | core_deepest_state = PWRDM_POWER_OFF; | |
184 | } | |
6af83b38 SP |
185 | |
186 | /* Check if current state is valid */ | |
04908918 JP |
187 | if ((cx->valid) && |
188 | (cx->mpu_state >= mpu_deepest_state) && | |
189 | (cx->core_state >= core_deepest_state)) { | |
e978aa7d | 190 | return index; |
6af83b38 | 191 | } else { |
badc303a | 192 | int idx = OMAP3_NUM_STATES - 1; |
6af83b38 | 193 | |
c6cd91de | 194 | /* Reach the current state starting at highest C-state */ |
badc303a | 195 | for (; idx >= 0; idx--) { |
46bcfad7 | 196 | if (&drv->states[idx] == curr) { |
e978aa7d | 197 | next_index = idx; |
6af83b38 SP |
198 | break; |
199 | } | |
200 | } | |
201 | ||
c6cd91de | 202 | /* Should never hit this condition */ |
e978aa7d | 203 | WARN_ON(next_index == -1); |
6af83b38 SP |
204 | |
205 | /* | |
206 | * Drop to next valid state. | |
207 | * Start search from the next (lower) state. | |
208 | */ | |
209 | idx--; | |
badc303a | 210 | for (; idx >= 0; idx--) { |
4202735e | 211 | cx = cpuidle_get_statedata(&dev->states_usage[idx]); |
04908918 JP |
212 | if ((cx->valid) && |
213 | (cx->mpu_state >= mpu_deepest_state) && | |
214 | (cx->core_state >= core_deepest_state)) { | |
e978aa7d | 215 | next_index = idx; |
6af83b38 SP |
216 | break; |
217 | } | |
218 | } | |
219 | /* | |
badc303a | 220 | * C1 is always valid. |
e978aa7d DD |
221 | * So, no need to check for 'next_index == -1' outside |
222 | * this loop. | |
6af83b38 SP |
223 | */ |
224 | } | |
225 | ||
e978aa7d | 226 | return next_index; |
6af83b38 SP |
227 | } |
228 | ||
99e6a4d2 RN |
229 | /** |
230 | * omap3_enter_idle_bm - Checks for any bus activity | |
231 | * @dev: cpuidle device | |
46bcfad7 | 232 | * @drv: cpuidle driver |
e978aa7d | 233 | * @index: array index of target state to be programmed |
99e6a4d2 | 234 | * |
badc303a JP |
235 | * This function checks for any pending activity and then programs |
236 | * the device to the specified or a safer state. | |
99e6a4d2 RN |
237 | */ |
238 | static int omap3_enter_idle_bm(struct cpuidle_device *dev, | |
46bcfad7 | 239 | struct cpuidle_driver *drv, |
e978aa7d | 240 | int index) |
99e6a4d2 | 241 | { |
e978aa7d | 242 | int new_state_idx; |
c6cd91de | 243 | u32 core_next_state, per_next_state = 0, per_saved_state = 0, cam_state; |
badc303a | 244 | struct omap3_idle_statedata *cx; |
e7410cf7 | 245 | int ret; |
0f724ed9 | 246 | |
c6cd91de | 247 | if (!omap3_can_sleep()) { |
46bcfad7 | 248 | new_state_idx = drv->safe_state_index; |
e7410cf7 KH |
249 | goto select_state; |
250 | } | |
251 | ||
e7410cf7 KH |
252 | /* |
253 | * Prevent idle completely if CAM is active. | |
254 | * CAM does not have wakeup capability in OMAP3. | |
255 | */ | |
256 | cam_state = pwrdm_read_pwrst(cam_pd); | |
257 | if (cam_state == PWRDM_POWER_ON) { | |
46bcfad7 | 258 | new_state_idx = drv->safe_state_index; |
e7410cf7 KH |
259 | goto select_state; |
260 | } | |
261 | ||
c6cd91de JP |
262 | /* |
263 | * FIXME: we currently manage device-specific idle states | |
264 | * for PER and CORE in combination with CPU-specific | |
265 | * idle states. This is wrong, and device-specific | |
266 | * idle management needs to be separated out into | |
267 | * its own code. | |
268 | */ | |
269 | ||
e7410cf7 KH |
270 | /* |
271 | * Prevent PER off if CORE is not in retention or off as this | |
272 | * would disable PER wakeups completely. | |
273 | */ | |
4202735e | 274 | cx = cpuidle_get_statedata(&dev->states_usage[index]); |
c6cd91de | 275 | core_next_state = cx->core_state; |
e7410cf7 KH |
276 | per_next_state = per_saved_state = pwrdm_read_next_pwrst(per_pd); |
277 | if ((per_next_state == PWRDM_POWER_OFF) && | |
65707fb3 | 278 | (core_next_state > PWRDM_POWER_RET)) |
e7410cf7 | 279 | per_next_state = PWRDM_POWER_RET; |
0f724ed9 | 280 | |
e7410cf7 KH |
281 | /* Are we changing PER target state? */ |
282 | if (per_next_state != per_saved_state) | |
283 | pwrdm_set_next_pwrst(per_pd, per_next_state); | |
284 | ||
46bcfad7 | 285 | new_state_idx = next_valid_state(dev, drv, index); |
c6cd91de | 286 | |
e7410cf7 | 287 | select_state: |
46bcfad7 | 288 | ret = omap3_enter_idle(dev, drv, new_state_idx); |
e7410cf7 KH |
289 | |
290 | /* Restore original PER state if it was modified */ | |
291 | if (per_next_state != per_saved_state) | |
292 | pwrdm_set_next_pwrst(per_pd, per_saved_state); | |
293 | ||
294 | return ret; | |
99e6a4d2 RN |
295 | } |
296 | ||
297 | DEFINE_PER_CPU(struct cpuidle_device, omap3_idle_dev); | |
298 | ||
bb4de3df KH |
299 | void omap3_pm_init_cpuidle(struct cpuidle_params *cpuidle_board_params) |
300 | { | |
301 | int i; | |
302 | ||
303 | if (!cpuidle_board_params) | |
304 | return; | |
305 | ||
badc303a JP |
306 | for (i = 0; i < OMAP3_NUM_STATES; i++) { |
307 | cpuidle_params_table[i].valid = cpuidle_board_params[i].valid; | |
866ba0ef JP |
308 | cpuidle_params_table[i].exit_latency = |
309 | cpuidle_board_params[i].exit_latency; | |
310 | cpuidle_params_table[i].target_residency = | |
311 | cpuidle_board_params[i].target_residency; | |
bb4de3df KH |
312 | } |
313 | return; | |
314 | } | |
315 | ||
99e6a4d2 RN |
316 | struct cpuidle_driver omap3_idle_driver = { |
317 | .name = "omap3_idle", | |
318 | .owner = THIS_MODULE, | |
319 | }; | |
320 | ||
46bcfad7 DD |
321 | /* Helper to fill the C-state common data*/ |
322 | static inline void _fill_cstate(struct cpuidle_driver *drv, | |
badc303a JP |
323 | int idx, const char *descr) |
324 | { | |
46bcfad7 | 325 | struct cpuidle_state *state = &drv->states[idx]; |
badc303a JP |
326 | |
327 | state->exit_latency = cpuidle_params_table[idx].exit_latency; | |
328 | state->target_residency = cpuidle_params_table[idx].target_residency; | |
329 | state->flags = CPUIDLE_FLAG_TIME_VALID; | |
330 | state->enter = omap3_enter_idle_bm; | |
badc303a JP |
331 | sprintf(state->name, "C%d", idx + 1); |
332 | strncpy(state->desc, descr, CPUIDLE_DESC_LEN); | |
46bcfad7 DD |
333 | |
334 | } | |
335 | ||
336 | /* Helper to register the driver_data */ | |
337 | static inline struct omap3_idle_statedata *_fill_cstate_usage( | |
338 | struct cpuidle_device *dev, | |
339 | int idx) | |
340 | { | |
341 | struct omap3_idle_statedata *cx = &omap3_idle_data[idx]; | |
342 | struct cpuidle_state_usage *state_usage = &dev->states_usage[idx]; | |
343 | ||
344 | cx->valid = cpuidle_params_table[idx].valid; | |
4202735e | 345 | cpuidle_set_statedata(state_usage, cx); |
badc303a JP |
346 | |
347 | return cx; | |
348 | } | |
349 | ||
99e6a4d2 RN |
350 | /** |
351 | * omap3_idle_init - Init routine for OMAP3 idle | |
352 | * | |
badc303a | 353 | * Registers the OMAP3 specific cpuidle driver to the cpuidle |
99e6a4d2 RN |
354 | * framework with the valid set of states. |
355 | */ | |
0343371e | 356 | int __init omap3_idle_init(void) |
99e6a4d2 | 357 | { |
99e6a4d2 | 358 | struct cpuidle_device *dev; |
46bcfad7 | 359 | struct cpuidle_driver *drv = &omap3_idle_driver; |
badc303a | 360 | struct omap3_idle_statedata *cx; |
99e6a4d2 RN |
361 | |
362 | mpu_pd = pwrdm_lookup("mpu_pwrdm"); | |
20b01669 | 363 | core_pd = pwrdm_lookup("core_pwrdm"); |
e7410cf7 KH |
364 | per_pd = pwrdm_lookup("per_pwrdm"); |
365 | cam_pd = pwrdm_lookup("cam_pwrdm"); | |
99e6a4d2 | 366 | |
46bcfad7 DD |
367 | |
368 | drv->safe_state_index = -1; | |
99e6a4d2 RN |
369 | dev = &per_cpu(omap3_idle_dev, smp_processor_id()); |
370 | ||
badc303a | 371 | /* C1 . MPU WFI + Core active */ |
46bcfad7 DD |
372 | _fill_cstate(drv, 0, "MPU ON + CORE ON"); |
373 | (&drv->states[0])->enter = omap3_enter_idle; | |
374 | drv->safe_state_index = 0; | |
375 | cx = _fill_cstate_usage(dev, 0); | |
badc303a JP |
376 | cx->valid = 1; /* C1 is always valid */ |
377 | cx->mpu_state = PWRDM_POWER_ON; | |
378 | cx->core_state = PWRDM_POWER_ON; | |
379 | ||
380 | /* C2 . MPU WFI + Core inactive */ | |
46bcfad7 DD |
381 | _fill_cstate(drv, 1, "MPU ON + CORE ON"); |
382 | cx = _fill_cstate_usage(dev, 1); | |
badc303a JP |
383 | cx->mpu_state = PWRDM_POWER_ON; |
384 | cx->core_state = PWRDM_POWER_ON; | |
385 | ||
386 | /* C3 . MPU CSWR + Core inactive */ | |
46bcfad7 DD |
387 | _fill_cstate(drv, 2, "MPU RET + CORE ON"); |
388 | cx = _fill_cstate_usage(dev, 2); | |
badc303a JP |
389 | cx->mpu_state = PWRDM_POWER_RET; |
390 | cx->core_state = PWRDM_POWER_ON; | |
391 | ||
392 | /* C4 . MPU OFF + Core inactive */ | |
46bcfad7 DD |
393 | _fill_cstate(drv, 3, "MPU OFF + CORE ON"); |
394 | cx = _fill_cstate_usage(dev, 3); | |
badc303a JP |
395 | cx->mpu_state = PWRDM_POWER_OFF; |
396 | cx->core_state = PWRDM_POWER_ON; | |
397 | ||
398 | /* C5 . MPU RET + Core RET */ | |
46bcfad7 DD |
399 | _fill_cstate(drv, 4, "MPU RET + CORE RET"); |
400 | cx = _fill_cstate_usage(dev, 4); | |
badc303a JP |
401 | cx->mpu_state = PWRDM_POWER_RET; |
402 | cx->core_state = PWRDM_POWER_RET; | |
99e6a4d2 | 403 | |
badc303a | 404 | /* C6 . MPU OFF + Core RET */ |
46bcfad7 DD |
405 | _fill_cstate(drv, 5, "MPU OFF + CORE RET"); |
406 | cx = _fill_cstate_usage(dev, 5); | |
badc303a JP |
407 | cx->mpu_state = PWRDM_POWER_OFF; |
408 | cx->core_state = PWRDM_POWER_RET; | |
409 | ||
410 | /* C7 . MPU OFF + Core OFF */ | |
46bcfad7 DD |
411 | _fill_cstate(drv, 6, "MPU OFF + CORE OFF"); |
412 | cx = _fill_cstate_usage(dev, 6); | |
badc303a JP |
413 | /* |
414 | * Erratum i583: implementation for ES rev < Es1.2 on 3630. We cannot | |
415 | * enable OFF mode in a stable form for previous revisions. | |
416 | * We disable C7 state as a result. | |
417 | */ | |
418 | if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583)) { | |
419 | cx->valid = 0; | |
420 | pr_warn("%s: core off state C7 disabled due to i583\n", | |
421 | __func__); | |
422 | } | |
423 | cx->mpu_state = PWRDM_POWER_OFF; | |
424 | cx->core_state = PWRDM_POWER_OFF; | |
99e6a4d2 | 425 | |
46bcfad7 DD |
426 | drv->state_count = OMAP3_NUM_STATES; |
427 | cpuidle_register_driver(&omap3_idle_driver); | |
428 | ||
badc303a | 429 | dev->state_count = OMAP3_NUM_STATES; |
99e6a4d2 RN |
430 | if (cpuidle_register_device(dev)) { |
431 | printk(KERN_ERR "%s: CPUidle register device failed\n", | |
432 | __func__); | |
433 | return -EIO; | |
434 | } | |
435 | ||
436 | return 0; | |
437 | } | |
0343371e KJ |
438 | #else |
439 | int __init omap3_idle_init(void) | |
440 | { | |
441 | return 0; | |
442 | } | |
99e6a4d2 | 443 | #endif /* CONFIG_CPU_IDLE */ |