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 RN |
26 | #include <linux/cpuidle.h> |
27 | ||
28 | #include <plat/prcm.h> | |
20b01669 | 29 | #include <plat/irqs.h> |
72e06d08 | 30 | #include "powerdomain.h" |
1540f214 | 31 | #include "clockdomain.h" |
0f724ed9 | 32 | #include <plat/serial.h> |
99e6a4d2 | 33 | |
c98e2230 | 34 | #include "pm.h" |
4814ced5 | 35 | #include "control.h" |
c98e2230 | 36 | |
99e6a4d2 RN |
37 | #ifdef CONFIG_CPU_IDLE |
38 | ||
bb4de3df KH |
39 | /* |
40 | * The latencies/thresholds for various C states have | |
41 | * to be configured from the respective board files. | |
42 | * These are some default values (which might not provide | |
43 | * the best power savings) used on boards which do not | |
44 | * pass these details from the board file. | |
45 | */ | |
46 | static struct cpuidle_params cpuidle_params_table[] = { | |
47 | /* C1 */ | |
866ba0ef | 48 | {2 + 2, 5, 1}, |
bb4de3df | 49 | /* C2 */ |
866ba0ef | 50 | {10 + 10, 30, 1}, |
bb4de3df | 51 | /* C3 */ |
866ba0ef | 52 | {50 + 50, 300, 1}, |
bb4de3df | 53 | /* C4 */ |
866ba0ef | 54 | {1500 + 1800, 4000, 1}, |
bb4de3df | 55 | /* C5 */ |
866ba0ef | 56 | {2500 + 7500, 12000, 1}, |
bb4de3df | 57 | /* C6 */ |
866ba0ef | 58 | {3000 + 8500, 15000, 1}, |
bb4de3df | 59 | /* C7 */ |
866ba0ef | 60 | {10000 + 30000, 300000, 1}, |
bb4de3df | 61 | }; |
badc303a JP |
62 | #define OMAP3_NUM_STATES ARRAY_SIZE(cpuidle_params_table) |
63 | ||
64 | /* Mach specific information to be recorded in the C-state driver_data */ | |
65 | struct omap3_idle_statedata { | |
66 | u32 mpu_state; | |
67 | u32 core_state; | |
68 | u8 valid; | |
69 | }; | |
70 | struct omap3_idle_statedata omap3_idle_data[OMAP3_NUM_STATES]; | |
71 | ||
72 | struct powerdomain *mpu_pd, *core_pd, *per_pd, *cam_pd; | |
bb4de3df | 73 | |
06d8f065 PDS |
74 | static int _cpuidle_allow_idle(struct powerdomain *pwrdm, |
75 | struct clockdomain *clkdm) | |
76 | { | |
5cd1937b | 77 | clkdm_allow_idle(clkdm); |
06d8f065 PDS |
78 | return 0; |
79 | } | |
80 | ||
81 | static int _cpuidle_deny_idle(struct powerdomain *pwrdm, | |
82 | struct clockdomain *clkdm) | |
83 | { | |
5cd1937b | 84 | clkdm_deny_idle(clkdm); |
06d8f065 PDS |
85 | return 0; |
86 | } | |
87 | ||
99e6a4d2 RN |
88 | /** |
89 | * omap3_enter_idle - Programs OMAP3 to enter the specified state | |
90 | * @dev: cpuidle device | |
91 | * @state: The target state to be programmed | |
92 | * | |
93 | * Called from the CPUidle framework to program the device to the | |
94 | * specified target state selected by the governor. | |
95 | */ | |
96 | static int omap3_enter_idle(struct cpuidle_device *dev, | |
97 | struct cpuidle_state *state) | |
98 | { | |
badc303a | 99 | struct omap3_idle_statedata *cx = cpuidle_get_statedata(state); |
99e6a4d2 | 100 | struct timespec ts_preidle, ts_postidle, ts_idle; |
c98e2230 | 101 | u32 mpu_state = cx->mpu_state, core_state = cx->core_state; |
99e6a4d2 | 102 | |
99e6a4d2 RN |
103 | /* Used to keep track of the total time in idle */ |
104 | getnstimeofday(&ts_preidle); | |
105 | ||
106 | local_irq_disable(); | |
107 | local_fiq_disable(); | |
108 | ||
7139178e JH |
109 | pwrdm_set_next_pwrst(mpu_pd, mpu_state); |
110 | pwrdm_set_next_pwrst(core_pd, core_state); | |
20b01669 | 111 | |
cf22854c | 112 | if (omap_irq_pending() || need_resched()) |
20b01669 | 113 | goto return_sleep_time; |
99e6a4d2 | 114 | |
badc303a JP |
115 | /* Deny idle for C1 */ |
116 | if (state == &dev->states[0]) { | |
06d8f065 PDS |
117 | pwrdm_for_each_clkdm(mpu_pd, _cpuidle_deny_idle); |
118 | pwrdm_for_each_clkdm(core_pd, _cpuidle_deny_idle); | |
119 | } | |
120 | ||
99e6a4d2 RN |
121 | /* Execute ARM wfi */ |
122 | omap_sram_idle(); | |
123 | ||
badc303a JP |
124 | /* Re-allow idle for C1 */ |
125 | if (state == &dev->states[0]) { | |
06d8f065 PDS |
126 | pwrdm_for_each_clkdm(mpu_pd, _cpuidle_allow_idle); |
127 | pwrdm_for_each_clkdm(core_pd, _cpuidle_allow_idle); | |
128 | } | |
129 | ||
20b01669 | 130 | return_sleep_time: |
99e6a4d2 RN |
131 | getnstimeofday(&ts_postidle); |
132 | ts_idle = timespec_sub(ts_postidle, ts_preidle); | |
133 | ||
134 | local_irq_enable(); | |
135 | local_fiq_enable(); | |
136 | ||
afbcf619 | 137 | return ts_idle.tv_nsec / NSEC_PER_USEC + ts_idle.tv_sec * USEC_PER_SEC; |
99e6a4d2 RN |
138 | } |
139 | ||
6af83b38 | 140 | /** |
04908918 | 141 | * next_valid_state - Find next valid C-state |
6af83b38 | 142 | * @dev: cpuidle device |
04908918 | 143 | * @state: Currently selected C-state |
6af83b38 SP |
144 | * |
145 | * If the current state is valid, it is returned back to the caller. | |
146 | * Else, this function searches for a lower c-state which is still | |
badc303a | 147 | * valid. |
04908918 JP |
148 | * |
149 | * A state is valid if the 'valid' field is enabled and | |
150 | * if it satisfies the enable_off_mode condition. | |
6af83b38 SP |
151 | */ |
152 | static struct cpuidle_state *next_valid_state(struct cpuidle_device *dev, | |
badc303a | 153 | struct cpuidle_state *curr) |
6af83b38 SP |
154 | { |
155 | struct cpuidle_state *next = NULL; | |
c6cd91de | 156 | struct omap3_idle_statedata *cx = cpuidle_get_statedata(curr); |
04908918 JP |
157 | u32 mpu_deepest_state = PWRDM_POWER_RET; |
158 | u32 core_deepest_state = PWRDM_POWER_RET; | |
159 | ||
160 | if (enable_off_mode) { | |
161 | mpu_deepest_state = PWRDM_POWER_OFF; | |
162 | /* | |
163 | * Erratum i583: valable for ES rev < Es1.2 on 3630. | |
164 | * CORE OFF mode is not supported in a stable form, restrict | |
165 | * instead the CORE state to RET. | |
166 | */ | |
167 | if (!IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583)) | |
168 | core_deepest_state = PWRDM_POWER_OFF; | |
169 | } | |
6af83b38 SP |
170 | |
171 | /* Check if current state is valid */ | |
04908918 JP |
172 | if ((cx->valid) && |
173 | (cx->mpu_state >= mpu_deepest_state) && | |
174 | (cx->core_state >= core_deepest_state)) { | |
6af83b38 SP |
175 | return curr; |
176 | } else { | |
badc303a | 177 | int idx = OMAP3_NUM_STATES - 1; |
6af83b38 | 178 | |
c6cd91de | 179 | /* Reach the current state starting at highest C-state */ |
badc303a | 180 | for (; idx >= 0; idx--) { |
6af83b38 SP |
181 | if (&dev->states[idx] == curr) { |
182 | next = &dev->states[idx]; | |
183 | break; | |
184 | } | |
185 | } | |
186 | ||
c6cd91de | 187 | /* Should never hit this condition */ |
6af83b38 SP |
188 | WARN_ON(next == NULL); |
189 | ||
190 | /* | |
191 | * Drop to next valid state. | |
192 | * Start search from the next (lower) state. | |
193 | */ | |
194 | idx--; | |
badc303a | 195 | for (; idx >= 0; idx--) { |
6af83b38 | 196 | cx = cpuidle_get_statedata(&dev->states[idx]); |
04908918 JP |
197 | if ((cx->valid) && |
198 | (cx->mpu_state >= mpu_deepest_state) && | |
199 | (cx->core_state >= core_deepest_state)) { | |
6af83b38 SP |
200 | next = &dev->states[idx]; |
201 | break; | |
202 | } | |
203 | } | |
204 | /* | |
badc303a | 205 | * C1 is always valid. |
6af83b38 SP |
206 | * So, no need to check for 'next==NULL' outside this loop. |
207 | */ | |
208 | } | |
209 | ||
210 | return next; | |
211 | } | |
212 | ||
99e6a4d2 RN |
213 | /** |
214 | * omap3_enter_idle_bm - Checks for any bus activity | |
215 | * @dev: cpuidle device | |
216 | * @state: The target state to be programmed | |
217 | * | |
badc303a JP |
218 | * This function checks for any pending activity and then programs |
219 | * the device to the specified or a safer state. | |
99e6a4d2 RN |
220 | */ |
221 | static int omap3_enter_idle_bm(struct cpuidle_device *dev, | |
222 | struct cpuidle_state *state) | |
223 | { | |
c6cd91de JP |
224 | struct cpuidle_state *new_state; |
225 | u32 core_next_state, per_next_state = 0, per_saved_state = 0, cam_state; | |
badc303a | 226 | struct omap3_idle_statedata *cx; |
e7410cf7 | 227 | int ret; |
0f724ed9 | 228 | |
c6cd91de | 229 | if (!omap3_can_sleep()) { |
0f724ed9 | 230 | new_state = dev->safe_state; |
e7410cf7 KH |
231 | goto select_state; |
232 | } | |
233 | ||
e7410cf7 KH |
234 | /* |
235 | * Prevent idle completely if CAM is active. | |
236 | * CAM does not have wakeup capability in OMAP3. | |
237 | */ | |
238 | cam_state = pwrdm_read_pwrst(cam_pd); | |
239 | if (cam_state == PWRDM_POWER_ON) { | |
240 | new_state = dev->safe_state; | |
241 | goto select_state; | |
242 | } | |
243 | ||
c6cd91de JP |
244 | /* |
245 | * FIXME: we currently manage device-specific idle states | |
246 | * for PER and CORE in combination with CPU-specific | |
247 | * idle states. This is wrong, and device-specific | |
248 | * idle management needs to be separated out into | |
249 | * its own code. | |
250 | */ | |
251 | ||
e7410cf7 KH |
252 | /* |
253 | * Prevent PER off if CORE is not in retention or off as this | |
254 | * would disable PER wakeups completely. | |
255 | */ | |
c6cd91de JP |
256 | cx = cpuidle_get_statedata(state); |
257 | core_next_state = cx->core_state; | |
e7410cf7 KH |
258 | per_next_state = per_saved_state = pwrdm_read_next_pwrst(per_pd); |
259 | if ((per_next_state == PWRDM_POWER_OFF) && | |
65707fb3 | 260 | (core_next_state > PWRDM_POWER_RET)) |
e7410cf7 | 261 | per_next_state = PWRDM_POWER_RET; |
0f724ed9 | 262 | |
e7410cf7 KH |
263 | /* Are we changing PER target state? */ |
264 | if (per_next_state != per_saved_state) | |
265 | pwrdm_set_next_pwrst(per_pd, per_next_state); | |
266 | ||
c6cd91de JP |
267 | new_state = next_valid_state(dev, state); |
268 | ||
e7410cf7 | 269 | select_state: |
0f724ed9 | 270 | dev->last_state = new_state; |
e7410cf7 KH |
271 | ret = omap3_enter_idle(dev, new_state); |
272 | ||
273 | /* Restore original PER state if it was modified */ | |
274 | if (per_next_state != per_saved_state) | |
275 | pwrdm_set_next_pwrst(per_pd, per_saved_state); | |
276 | ||
277 | return ret; | |
99e6a4d2 RN |
278 | } |
279 | ||
280 | DEFINE_PER_CPU(struct cpuidle_device, omap3_idle_dev); | |
281 | ||
bb4de3df KH |
282 | void omap3_pm_init_cpuidle(struct cpuidle_params *cpuidle_board_params) |
283 | { | |
284 | int i; | |
285 | ||
286 | if (!cpuidle_board_params) | |
287 | return; | |
288 | ||
badc303a JP |
289 | for (i = 0; i < OMAP3_NUM_STATES; i++) { |
290 | cpuidle_params_table[i].valid = cpuidle_board_params[i].valid; | |
866ba0ef JP |
291 | cpuidle_params_table[i].exit_latency = |
292 | cpuidle_board_params[i].exit_latency; | |
293 | cpuidle_params_table[i].target_residency = | |
294 | cpuidle_board_params[i].target_residency; | |
bb4de3df KH |
295 | } |
296 | return; | |
297 | } | |
298 | ||
99e6a4d2 RN |
299 | struct cpuidle_driver omap3_idle_driver = { |
300 | .name = "omap3_idle", | |
301 | .owner = THIS_MODULE, | |
302 | }; | |
303 | ||
c6cd91de | 304 | /* Helper to fill the C-state common data and register the driver_data */ |
badc303a JP |
305 | static inline struct omap3_idle_statedata *_fill_cstate( |
306 | struct cpuidle_device *dev, | |
307 | int idx, const char *descr) | |
308 | { | |
309 | struct omap3_idle_statedata *cx = &omap3_idle_data[idx]; | |
310 | struct cpuidle_state *state = &dev->states[idx]; | |
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; | |
316 | cx->valid = cpuidle_params_table[idx].valid; | |
317 | sprintf(state->name, "C%d", idx + 1); | |
318 | strncpy(state->desc, descr, CPUIDLE_DESC_LEN); | |
319 | cpuidle_set_statedata(state, cx); | |
320 | ||
321 | return cx; | |
322 | } | |
323 | ||
99e6a4d2 RN |
324 | /** |
325 | * omap3_idle_init - Init routine for OMAP3 idle | |
326 | * | |
badc303a | 327 | * Registers the OMAP3 specific cpuidle driver to the cpuidle |
99e6a4d2 RN |
328 | * framework with the valid set of states. |
329 | */ | |
0343371e | 330 | int __init omap3_idle_init(void) |
99e6a4d2 | 331 | { |
99e6a4d2 | 332 | struct cpuidle_device *dev; |
badc303a | 333 | struct omap3_idle_statedata *cx; |
99e6a4d2 RN |
334 | |
335 | mpu_pd = pwrdm_lookup("mpu_pwrdm"); | |
20b01669 | 336 | core_pd = pwrdm_lookup("core_pwrdm"); |
e7410cf7 KH |
337 | per_pd = pwrdm_lookup("per_pwrdm"); |
338 | cam_pd = pwrdm_lookup("cam_pwrdm"); | |
99e6a4d2 | 339 | |
99e6a4d2 | 340 | cpuidle_register_driver(&omap3_idle_driver); |
99e6a4d2 RN |
341 | dev = &per_cpu(omap3_idle_dev, smp_processor_id()); |
342 | ||
badc303a JP |
343 | /* C1 . MPU WFI + Core active */ |
344 | cx = _fill_cstate(dev, 0, "MPU ON + CORE ON"); | |
345 | (&dev->states[0])->enter = omap3_enter_idle; | |
346 | dev->safe_state = &dev->states[0]; | |
347 | cx->valid = 1; /* C1 is always valid */ | |
348 | cx->mpu_state = PWRDM_POWER_ON; | |
349 | cx->core_state = PWRDM_POWER_ON; | |
350 | ||
351 | /* C2 . MPU WFI + Core inactive */ | |
352 | cx = _fill_cstate(dev, 1, "MPU ON + CORE ON"); | |
353 | cx->mpu_state = PWRDM_POWER_ON; | |
354 | cx->core_state = PWRDM_POWER_ON; | |
355 | ||
356 | /* C3 . MPU CSWR + Core inactive */ | |
357 | cx = _fill_cstate(dev, 2, "MPU RET + CORE ON"); | |
358 | cx->mpu_state = PWRDM_POWER_RET; | |
359 | cx->core_state = PWRDM_POWER_ON; | |
360 | ||
361 | /* C4 . MPU OFF + Core inactive */ | |
362 | cx = _fill_cstate(dev, 3, "MPU OFF + CORE ON"); | |
363 | cx->mpu_state = PWRDM_POWER_OFF; | |
364 | cx->core_state = PWRDM_POWER_ON; | |
365 | ||
366 | /* C5 . MPU RET + Core RET */ | |
367 | cx = _fill_cstate(dev, 4, "MPU RET + CORE RET"); | |
368 | cx->mpu_state = PWRDM_POWER_RET; | |
369 | cx->core_state = PWRDM_POWER_RET; | |
99e6a4d2 | 370 | |
badc303a JP |
371 | /* C6 . MPU OFF + Core RET */ |
372 | cx = _fill_cstate(dev, 5, "MPU OFF + CORE RET"); | |
373 | cx->mpu_state = PWRDM_POWER_OFF; | |
374 | cx->core_state = PWRDM_POWER_RET; | |
375 | ||
376 | /* C7 . MPU OFF + Core OFF */ | |
377 | cx = _fill_cstate(dev, 6, "MPU OFF + CORE OFF"); | |
378 | /* | |
379 | * Erratum i583: implementation for ES rev < Es1.2 on 3630. We cannot | |
380 | * enable OFF mode in a stable form for previous revisions. | |
381 | * We disable C7 state as a result. | |
382 | */ | |
383 | if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583)) { | |
384 | cx->valid = 0; | |
385 | pr_warn("%s: core off state C7 disabled due to i583\n", | |
386 | __func__); | |
387 | } | |
388 | cx->mpu_state = PWRDM_POWER_OFF; | |
389 | cx->core_state = PWRDM_POWER_OFF; | |
99e6a4d2 | 390 | |
badc303a | 391 | dev->state_count = OMAP3_NUM_STATES; |
99e6a4d2 RN |
392 | if (cpuidle_register_device(dev)) { |
393 | printk(KERN_ERR "%s: CPUidle register device failed\n", | |
394 | __func__); | |
395 | return -EIO; | |
396 | } | |
397 | ||
398 | return 0; | |
399 | } | |
0343371e KJ |
400 | #else |
401 | int __init omap3_idle_init(void) | |
402 | { | |
403 | return 0; | |
404 | } | |
99e6a4d2 | 405 | #endif /* CONFIG_CPU_IDLE */ |