Commit | Line | Data |
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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> |
ff819da4 | 28 | #include <linux/cpu_pm.h> |
99e6a4d2 RN |
29 | |
30 | #include <plat/prcm.h> | |
20b01669 | 31 | #include <plat/irqs.h> |
72e06d08 | 32 | #include "powerdomain.h" |
1540f214 | 33 | #include "clockdomain.h" |
99e6a4d2 | 34 | |
c98e2230 | 35 | #include "pm.h" |
4814ced5 | 36 | #include "control.h" |
ba8bb18a | 37 | #include "common.h" |
c98e2230 | 38 | |
99e6a4d2 RN |
39 | #ifdef CONFIG_CPU_IDLE |
40 | ||
bb4de3df KH |
41 | /* |
42 | * The latencies/thresholds for various C states have | |
43 | * to be configured from the respective board files. | |
44 | * These are some default values (which might not provide | |
45 | * the best power savings) used on boards which do not | |
46 | * pass these details from the board file. | |
47 | */ | |
48 | static struct cpuidle_params cpuidle_params_table[] = { | |
49 | /* C1 */ | |
866ba0ef | 50 | {2 + 2, 5, 1}, |
bb4de3df | 51 | /* C2 */ |
866ba0ef | 52 | {10 + 10, 30, 1}, |
bb4de3df | 53 | /* C3 */ |
866ba0ef | 54 | {50 + 50, 300, 1}, |
bb4de3df | 55 | /* C4 */ |
866ba0ef | 56 | {1500 + 1800, 4000, 1}, |
bb4de3df | 57 | /* C5 */ |
866ba0ef | 58 | {2500 + 7500, 12000, 1}, |
bb4de3df | 59 | /* C6 */ |
866ba0ef | 60 | {3000 + 8500, 15000, 1}, |
bb4de3df | 61 | /* C7 */ |
866ba0ef | 62 | {10000 + 30000, 300000, 1}, |
bb4de3df | 63 | }; |
badc303a JP |
64 | #define OMAP3_NUM_STATES ARRAY_SIZE(cpuidle_params_table) |
65 | ||
66 | /* Mach specific information to be recorded in the C-state driver_data */ | |
67 | struct omap3_idle_statedata { | |
68 | u32 mpu_state; | |
69 | u32 core_state; | |
70 | u8 valid; | |
71 | }; | |
72 | struct omap3_idle_statedata omap3_idle_data[OMAP3_NUM_STATES]; | |
73 | ||
74 | struct powerdomain *mpu_pd, *core_pd, *per_pd, *cam_pd; | |
bb4de3df | 75 | |
06d8f065 PDS |
76 | static int _cpuidle_allow_idle(struct powerdomain *pwrdm, |
77 | struct clockdomain *clkdm) | |
78 | { | |
5cd1937b | 79 | clkdm_allow_idle(clkdm); |
06d8f065 PDS |
80 | return 0; |
81 | } | |
82 | ||
83 | static int _cpuidle_deny_idle(struct powerdomain *pwrdm, | |
84 | struct clockdomain *clkdm) | |
85 | { | |
5cd1937b | 86 | clkdm_deny_idle(clkdm); |
06d8f065 PDS |
87 | return 0; |
88 | } | |
89 | ||
6da45dce | 90 | static int __omap3_enter_idle(struct cpuidle_device *dev, |
46bcfad7 | 91 | struct cpuidle_driver *drv, |
e978aa7d | 92 | int index) |
99e6a4d2 | 93 | { |
e978aa7d | 94 | struct omap3_idle_statedata *cx = |
4202735e | 95 | cpuidle_get_statedata(&dev->states_usage[index]); |
c98e2230 | 96 | u32 mpu_state = cx->mpu_state, core_state = cx->core_state; |
99e6a4d2 | 97 | |
99e6a4d2 RN |
98 | local_fiq_disable(); |
99 | ||
7139178e JH |
100 | pwrdm_set_next_pwrst(mpu_pd, mpu_state); |
101 | pwrdm_set_next_pwrst(core_pd, core_state); | |
20b01669 | 102 | |
cf22854c | 103 | if (omap_irq_pending() || need_resched()) |
20b01669 | 104 | goto return_sleep_time; |
99e6a4d2 | 105 | |
badc303a | 106 | /* Deny idle for C1 */ |
e978aa7d | 107 | if (index == 0) { |
06d8f065 PDS |
108 | pwrdm_for_each_clkdm(mpu_pd, _cpuidle_deny_idle); |
109 | pwrdm_for_each_clkdm(core_pd, _cpuidle_deny_idle); | |
110 | } | |
111 | ||
ff819da4 SS |
112 | /* |
113 | * Call idle CPU PM enter notifier chain so that | |
114 | * VFP context is saved. | |
115 | */ | |
116 | if (mpu_state == PWRDM_POWER_OFF) | |
117 | cpu_pm_enter(); | |
118 | ||
99e6a4d2 RN |
119 | /* Execute ARM wfi */ |
120 | omap_sram_idle(); | |
121 | ||
ff819da4 SS |
122 | /* |
123 | * Call idle CPU PM enter notifier chain to restore | |
124 | * VFP context. | |
125 | */ | |
126 | if (pwrdm_read_prev_pwrst(mpu_pd) == PWRDM_POWER_OFF) | |
127 | cpu_pm_exit(); | |
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 | 136 | |
99e6a4d2 RN |
137 | local_fiq_enable(); |
138 | ||
e978aa7d | 139 | return index; |
99e6a4d2 RN |
140 | } |
141 | ||
6da45dce RL |
142 | /** |
143 | * omap3_enter_idle - Programs OMAP3 to enter the specified state | |
144 | * @dev: cpuidle device | |
145 | * @drv: cpuidle driver | |
146 | * @index: the index of state to be entered | |
147 | * | |
148 | * Called from the CPUidle framework to program the device to the | |
149 | * specified target state selected by the governor. | |
150 | */ | |
151 | static inline int omap3_enter_idle(struct cpuidle_device *dev, | |
152 | struct cpuidle_driver *drv, | |
153 | int index) | |
154 | { | |
155 | return cpuidle_wrap_enter(dev, drv, index, __omap3_enter_idle); | |
156 | } | |
157 | ||
6af83b38 | 158 | /** |
04908918 | 159 | * next_valid_state - Find next valid C-state |
6af83b38 | 160 | * @dev: cpuidle device |
46bcfad7 | 161 | * @drv: cpuidle driver |
e978aa7d | 162 | * @index: Index of currently selected c-state |
6af83b38 | 163 | * |
e978aa7d DD |
164 | * If the state corresponding to index is valid, index is returned back |
165 | * to the caller. Else, this function searches for a lower c-state which is | |
166 | * still valid (as defined in omap3_power_states[]) and returns its index. | |
04908918 JP |
167 | * |
168 | * A state is valid if the 'valid' field is enabled and | |
169 | * if it satisfies the enable_off_mode condition. | |
6af83b38 | 170 | */ |
e978aa7d | 171 | static int next_valid_state(struct cpuidle_device *dev, |
46bcfad7 | 172 | struct cpuidle_driver *drv, |
e978aa7d | 173 | int index) |
6af83b38 | 174 | { |
4202735e | 175 | struct cpuidle_state_usage *curr_usage = &dev->states_usage[index]; |
46bcfad7 | 176 | struct cpuidle_state *curr = &drv->states[index]; |
4202735e | 177 | struct omap3_idle_statedata *cx = cpuidle_get_statedata(curr_usage); |
04908918 JP |
178 | u32 mpu_deepest_state = PWRDM_POWER_RET; |
179 | u32 core_deepest_state = PWRDM_POWER_RET; | |
e978aa7d | 180 | int next_index = -1; |
04908918 JP |
181 | |
182 | if (enable_off_mode) { | |
183 | mpu_deepest_state = PWRDM_POWER_OFF; | |
184 | /* | |
185 | * Erratum i583: valable for ES rev < Es1.2 on 3630. | |
186 | * CORE OFF mode is not supported in a stable form, restrict | |
187 | * instead the CORE state to RET. | |
188 | */ | |
189 | if (!IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583)) | |
190 | core_deepest_state = PWRDM_POWER_OFF; | |
191 | } | |
6af83b38 SP |
192 | |
193 | /* Check if current state is valid */ | |
04908918 JP |
194 | if ((cx->valid) && |
195 | (cx->mpu_state >= mpu_deepest_state) && | |
196 | (cx->core_state >= core_deepest_state)) { | |
e978aa7d | 197 | return index; |
6af83b38 | 198 | } else { |
badc303a | 199 | int idx = OMAP3_NUM_STATES - 1; |
6af83b38 | 200 | |
c6cd91de | 201 | /* Reach the current state starting at highest C-state */ |
badc303a | 202 | for (; idx >= 0; idx--) { |
46bcfad7 | 203 | if (&drv->states[idx] == curr) { |
e978aa7d | 204 | next_index = idx; |
6af83b38 SP |
205 | break; |
206 | } | |
207 | } | |
208 | ||
c6cd91de | 209 | /* Should never hit this condition */ |
e978aa7d | 210 | WARN_ON(next_index == -1); |
6af83b38 SP |
211 | |
212 | /* | |
213 | * Drop to next valid state. | |
214 | * Start search from the next (lower) state. | |
215 | */ | |
216 | idx--; | |
badc303a | 217 | for (; idx >= 0; idx--) { |
4202735e | 218 | cx = cpuidle_get_statedata(&dev->states_usage[idx]); |
04908918 JP |
219 | if ((cx->valid) && |
220 | (cx->mpu_state >= mpu_deepest_state) && | |
221 | (cx->core_state >= core_deepest_state)) { | |
e978aa7d | 222 | next_index = idx; |
6af83b38 SP |
223 | break; |
224 | } | |
225 | } | |
226 | /* | |
badc303a | 227 | * C1 is always valid. |
e978aa7d DD |
228 | * So, no need to check for 'next_index == -1' outside |
229 | * this loop. | |
6af83b38 SP |
230 | */ |
231 | } | |
232 | ||
e978aa7d | 233 | return next_index; |
6af83b38 SP |
234 | } |
235 | ||
99e6a4d2 RN |
236 | /** |
237 | * omap3_enter_idle_bm - Checks for any bus activity | |
238 | * @dev: cpuidle device | |
46bcfad7 | 239 | * @drv: cpuidle driver |
e978aa7d | 240 | * @index: array index of target state to be programmed |
99e6a4d2 | 241 | * |
badc303a JP |
242 | * This function checks for any pending activity and then programs |
243 | * the device to the specified or a safer state. | |
99e6a4d2 RN |
244 | */ |
245 | static int omap3_enter_idle_bm(struct cpuidle_device *dev, | |
46bcfad7 | 246 | struct cpuidle_driver *drv, |
e978aa7d | 247 | int index) |
99e6a4d2 | 248 | { |
e978aa7d | 249 | int new_state_idx; |
c6cd91de | 250 | u32 core_next_state, per_next_state = 0, per_saved_state = 0, cam_state; |
badc303a | 251 | struct omap3_idle_statedata *cx; |
e7410cf7 | 252 | int ret; |
0f724ed9 | 253 | |
e7410cf7 KH |
254 | /* |
255 | * Prevent idle completely if CAM is active. | |
256 | * CAM does not have wakeup capability in OMAP3. | |
257 | */ | |
258 | cam_state = pwrdm_read_pwrst(cam_pd); | |
259 | if (cam_state == PWRDM_POWER_ON) { | |
46bcfad7 | 260 | new_state_idx = drv->safe_state_index; |
e7410cf7 KH |
261 | goto select_state; |
262 | } | |
263 | ||
c6cd91de JP |
264 | /* |
265 | * FIXME: we currently manage device-specific idle states | |
266 | * for PER and CORE in combination with CPU-specific | |
267 | * idle states. This is wrong, and device-specific | |
268 | * idle management needs to be separated out into | |
269 | * its own code. | |
270 | */ | |
271 | ||
e7410cf7 KH |
272 | /* |
273 | * Prevent PER off if CORE is not in retention or off as this | |
274 | * would disable PER wakeups completely. | |
275 | */ | |
4202735e | 276 | cx = cpuidle_get_statedata(&dev->states_usage[index]); |
c6cd91de | 277 | core_next_state = cx->core_state; |
e7410cf7 KH |
278 | per_next_state = per_saved_state = pwrdm_read_next_pwrst(per_pd); |
279 | if ((per_next_state == PWRDM_POWER_OFF) && | |
65707fb3 | 280 | (core_next_state > PWRDM_POWER_RET)) |
e7410cf7 | 281 | per_next_state = PWRDM_POWER_RET; |
0f724ed9 | 282 | |
e7410cf7 KH |
283 | /* Are we changing PER target state? */ |
284 | if (per_next_state != per_saved_state) | |
285 | pwrdm_set_next_pwrst(per_pd, per_next_state); | |
286 | ||
46bcfad7 | 287 | new_state_idx = next_valid_state(dev, drv, index); |
c6cd91de | 288 | |
e7410cf7 | 289 | select_state: |
46bcfad7 | 290 | ret = omap3_enter_idle(dev, drv, new_state_idx); |
e7410cf7 KH |
291 | |
292 | /* Restore original PER state if it was modified */ | |
293 | if (per_next_state != per_saved_state) | |
294 | pwrdm_set_next_pwrst(per_pd, per_saved_state); | |
295 | ||
296 | return ret; | |
99e6a4d2 RN |
297 | } |
298 | ||
299 | DEFINE_PER_CPU(struct cpuidle_device, omap3_idle_dev); | |
300 | ||
99e6a4d2 RN |
301 | struct cpuidle_driver omap3_idle_driver = { |
302 | .name = "omap3_idle", | |
303 | .owner = THIS_MODULE, | |
304 | }; | |
305 | ||
46bcfad7 DD |
306 | /* Helper to fill the C-state common data*/ |
307 | static inline void _fill_cstate(struct cpuidle_driver *drv, | |
badc303a JP |
308 | int idx, const char *descr) |
309 | { | |
46bcfad7 | 310 | struct cpuidle_state *state = &drv->states[idx]; |
badc303a JP |
311 | |
312 | state->exit_latency = cpuidle_params_table[idx].exit_latency; | |
313 | state->target_residency = cpuidle_params_table[idx].target_residency; | |
314 | state->flags = CPUIDLE_FLAG_TIME_VALID; | |
315 | state->enter = omap3_enter_idle_bm; | |
badc303a JP |
316 | sprintf(state->name, "C%d", idx + 1); |
317 | strncpy(state->desc, descr, CPUIDLE_DESC_LEN); | |
46bcfad7 DD |
318 | |
319 | } | |
320 | ||
321 | /* Helper to register the driver_data */ | |
322 | static inline struct omap3_idle_statedata *_fill_cstate_usage( | |
323 | struct cpuidle_device *dev, | |
324 | int idx) | |
325 | { | |
326 | struct omap3_idle_statedata *cx = &omap3_idle_data[idx]; | |
327 | struct cpuidle_state_usage *state_usage = &dev->states_usage[idx]; | |
328 | ||
329 | cx->valid = cpuidle_params_table[idx].valid; | |
4202735e | 330 | cpuidle_set_statedata(state_usage, cx); |
badc303a JP |
331 | |
332 | return cx; | |
333 | } | |
334 | ||
99e6a4d2 RN |
335 | /** |
336 | * omap3_idle_init - Init routine for OMAP3 idle | |
337 | * | |
badc303a | 338 | * Registers the OMAP3 specific cpuidle driver to the cpuidle |
99e6a4d2 RN |
339 | * framework with the valid set of states. |
340 | */ | |
0343371e | 341 | int __init omap3_idle_init(void) |
99e6a4d2 | 342 | { |
99e6a4d2 | 343 | struct cpuidle_device *dev; |
46bcfad7 | 344 | struct cpuidle_driver *drv = &omap3_idle_driver; |
badc303a | 345 | struct omap3_idle_statedata *cx; |
99e6a4d2 RN |
346 | |
347 | mpu_pd = pwrdm_lookup("mpu_pwrdm"); | |
20b01669 | 348 | core_pd = pwrdm_lookup("core_pwrdm"); |
e7410cf7 KH |
349 | per_pd = pwrdm_lookup("per_pwrdm"); |
350 | cam_pd = pwrdm_lookup("cam_pwrdm"); | |
99e6a4d2 | 351 | |
46bcfad7 DD |
352 | |
353 | drv->safe_state_index = -1; | |
99e6a4d2 RN |
354 | dev = &per_cpu(omap3_idle_dev, smp_processor_id()); |
355 | ||
badc303a | 356 | /* C1 . MPU WFI + Core active */ |
46bcfad7 DD |
357 | _fill_cstate(drv, 0, "MPU ON + CORE ON"); |
358 | (&drv->states[0])->enter = omap3_enter_idle; | |
359 | drv->safe_state_index = 0; | |
360 | cx = _fill_cstate_usage(dev, 0); | |
badc303a JP |
361 | cx->valid = 1; /* C1 is always valid */ |
362 | cx->mpu_state = PWRDM_POWER_ON; | |
363 | cx->core_state = PWRDM_POWER_ON; | |
364 | ||
365 | /* C2 . MPU WFI + Core inactive */ | |
46bcfad7 DD |
366 | _fill_cstate(drv, 1, "MPU ON + CORE ON"); |
367 | cx = _fill_cstate_usage(dev, 1); | |
badc303a JP |
368 | cx->mpu_state = PWRDM_POWER_ON; |
369 | cx->core_state = PWRDM_POWER_ON; | |
370 | ||
371 | /* C3 . MPU CSWR + Core inactive */ | |
46bcfad7 DD |
372 | _fill_cstate(drv, 2, "MPU RET + CORE ON"); |
373 | cx = _fill_cstate_usage(dev, 2); | |
badc303a JP |
374 | cx->mpu_state = PWRDM_POWER_RET; |
375 | cx->core_state = PWRDM_POWER_ON; | |
376 | ||
377 | /* C4 . MPU OFF + Core inactive */ | |
46bcfad7 DD |
378 | _fill_cstate(drv, 3, "MPU OFF + CORE ON"); |
379 | cx = _fill_cstate_usage(dev, 3); | |
badc303a JP |
380 | cx->mpu_state = PWRDM_POWER_OFF; |
381 | cx->core_state = PWRDM_POWER_ON; | |
382 | ||
383 | /* C5 . MPU RET + Core RET */ | |
46bcfad7 DD |
384 | _fill_cstate(drv, 4, "MPU RET + CORE RET"); |
385 | cx = _fill_cstate_usage(dev, 4); | |
badc303a JP |
386 | cx->mpu_state = PWRDM_POWER_RET; |
387 | cx->core_state = PWRDM_POWER_RET; | |
99e6a4d2 | 388 | |
badc303a | 389 | /* C6 . MPU OFF + Core RET */ |
46bcfad7 DD |
390 | _fill_cstate(drv, 5, "MPU OFF + CORE RET"); |
391 | cx = _fill_cstate_usage(dev, 5); | |
badc303a JP |
392 | cx->mpu_state = PWRDM_POWER_OFF; |
393 | cx->core_state = PWRDM_POWER_RET; | |
394 | ||
395 | /* C7 . MPU OFF + Core OFF */ | |
46bcfad7 DD |
396 | _fill_cstate(drv, 6, "MPU OFF + CORE OFF"); |
397 | cx = _fill_cstate_usage(dev, 6); | |
badc303a JP |
398 | /* |
399 | * Erratum i583: implementation for ES rev < Es1.2 on 3630. We cannot | |
400 | * enable OFF mode in a stable form for previous revisions. | |
401 | * We disable C7 state as a result. | |
402 | */ | |
403 | if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583)) { | |
404 | cx->valid = 0; | |
405 | pr_warn("%s: core off state C7 disabled due to i583\n", | |
406 | __func__); | |
407 | } | |
408 | cx->mpu_state = PWRDM_POWER_OFF; | |
409 | cx->core_state = PWRDM_POWER_OFF; | |
99e6a4d2 | 410 | |
46bcfad7 DD |
411 | drv->state_count = OMAP3_NUM_STATES; |
412 | cpuidle_register_driver(&omap3_idle_driver); | |
413 | ||
badc303a | 414 | dev->state_count = OMAP3_NUM_STATES; |
99e6a4d2 RN |
415 | if (cpuidle_register_device(dev)) { |
416 | printk(KERN_ERR "%s: CPUidle register device failed\n", | |
417 | __func__); | |
418 | return -EIO; | |
419 | } | |
420 | ||
421 | return 0; | |
422 | } | |
0343371e KJ |
423 | #else |
424 | int __init omap3_idle_init(void) | |
425 | { | |
426 | return 0; | |
427 | } | |
99e6a4d2 | 428 | #endif /* CONFIG_CPU_IDLE */ |