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Commit | Line | Data |
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ad67ef68 PW |
1 | /* |
2 | * OMAP powerdomain control | |
3 | * | |
129c65ee | 4 | * Copyright (C) 2007-2008, 2011 Texas Instruments, Inc. |
694606c4 | 5 | * Copyright (C) 2007-2011 Nokia Corporation |
ad67ef68 PW |
6 | * |
7 | * Written by Paul Walmsley | |
3a759f09 | 8 | * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com> |
4788da26 | 9 | * State counting code by Tero Kristo <tero.kristo@nokia.com> |
3a759f09 | 10 | * |
ad67ef68 PW |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
33903eb5 | 15 | #undef DEBUG |
ad67ef68 PW |
16 | |
17 | #include <linux/kernel.h> | |
ad67ef68 | 18 | #include <linux/types.h> |
ad67ef68 PW |
19 | #include <linux/list.h> |
20 | #include <linux/errno.h> | |
9b7fc907 | 21 | #include <linux/string.h> |
3a090284 | 22 | #include <linux/spinlock.h> |
5e7c58dc JP |
23 | #include <trace/events/power.h> |
24 | ||
59fb659b | 25 | #include "cm2xxx_3xxx.h" |
a64bb9cd | 26 | #include "prcm44xx.h" |
59fb659b PW |
27 | #include "cm44xx.h" |
28 | #include "prm2xxx_3xxx.h" | |
d198b514 | 29 | #include "prm44xx.h" |
ad67ef68 | 30 | |
5e7c58dc | 31 | #include <asm/cpu.h> |
dbc04161 | 32 | |
72e06d08 | 33 | #include "powerdomain.h" |
1540f214 | 34 | #include "clockdomain.h" |
4794208c | 35 | #include "voltage.h" |
ad67ef68 | 36 | |
dbc04161 | 37 | #include "soc.h" |
6199ab26 PDS |
38 | #include "pm.h" |
39 | ||
5e7c58dc JP |
40 | #define PWRDM_TRACE_STATES_FLAG (1<<31) |
41 | ||
ba20bb12 PDS |
42 | enum { |
43 | PWRDM_STATE_NOW = 0, | |
44 | PWRDM_STATE_PREV, | |
45 | }; | |
46 | ||
c4978fba PW |
47 | /* |
48 | * Types of sleep_switch used internally in omap_set_pwrdm_state() | |
49 | * and its associated static functions | |
50 | * | |
51 | * XXX Better documentation is needed here | |
52 | */ | |
53 | #define ALREADYACTIVE_SWITCH 0 | |
54 | #define FORCEWAKEUP_SWITCH 1 | |
55 | #define LOWPOWERSTATE_SWITCH 2 | |
3a759f09 | 56 | |
ad67ef68 PW |
57 | /* pwrdm_list contains all registered struct powerdomains */ |
58 | static LIST_HEAD(pwrdm_list); | |
59 | ||
3b1e8b21 RN |
60 | static struct pwrdm_ops *arch_pwrdm; |
61 | ||
ad67ef68 PW |
62 | /* Private functions */ |
63 | ||
ad67ef68 PW |
64 | static struct powerdomain *_pwrdm_lookup(const char *name) |
65 | { | |
66 | struct powerdomain *pwrdm, *temp_pwrdm; | |
67 | ||
68 | pwrdm = NULL; | |
69 | ||
70 | list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { | |
71 | if (!strcmp(name, temp_pwrdm->name)) { | |
72 | pwrdm = temp_pwrdm; | |
73 | break; | |
74 | } | |
75 | } | |
76 | ||
77 | return pwrdm; | |
78 | } | |
79 | ||
e909d62a PW |
80 | /** |
81 | * _pwrdm_register - register a powerdomain | |
82 | * @pwrdm: struct powerdomain * to register | |
83 | * | |
84 | * Adds a powerdomain to the internal powerdomain list. Returns | |
85 | * -EINVAL if given a null pointer, -EEXIST if a powerdomain is | |
86 | * already registered by the provided name, or 0 upon success. | |
87 | */ | |
88 | static int _pwrdm_register(struct powerdomain *pwrdm) | |
89 | { | |
90 | int i; | |
048a7034 | 91 | struct voltagedomain *voltdm; |
e909d62a | 92 | |
a64bb9cd | 93 | if (!pwrdm || !pwrdm->name) |
e909d62a PW |
94 | return -EINVAL; |
95 | ||
a64bb9cd PW |
96 | if (cpu_is_omap44xx() && |
97 | pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) { | |
98 | pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n", | |
99 | pwrdm->name); | |
100 | return -EINVAL; | |
101 | } | |
102 | ||
e909d62a PW |
103 | if (_pwrdm_lookup(pwrdm->name)) |
104 | return -EEXIST; | |
105 | ||
cd8abed1 RN |
106 | if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm) |
107 | if (!arch_pwrdm->pwrdm_has_voltdm()) | |
108 | goto skip_voltdm; | |
109 | ||
048a7034 KH |
110 | voltdm = voltdm_lookup(pwrdm->voltdm.name); |
111 | if (!voltdm) { | |
112 | pr_err("powerdomain: %s: voltagedomain %s does not exist\n", | |
113 | pwrdm->name, pwrdm->voltdm.name); | |
114 | return -EINVAL; | |
115 | } | |
116 | pwrdm->voltdm.ptr = voltdm; | |
e69c22b1 | 117 | INIT_LIST_HEAD(&pwrdm->voltdm_node); |
cd8abed1 | 118 | skip_voltdm: |
3a090284 | 119 | spin_lock_init(&pwrdm->_lock); |
048a7034 | 120 | |
e909d62a PW |
121 | list_add(&pwrdm->node, &pwrdm_list); |
122 | ||
123 | /* Initialize the powerdomain's state counter */ | |
cf57aa7c | 124 | for (i = 0; i < PWRDM_MAX_PWRSTS; i++) |
e909d62a PW |
125 | pwrdm->state_counter[i] = 0; |
126 | ||
cde08f81 TG |
127 | pwrdm->ret_logic_off_counter = 0; |
128 | for (i = 0; i < pwrdm->banks; i++) | |
129 | pwrdm->ret_mem_off_counter[i] = 0; | |
130 | ||
1cfc4bdd RN |
131 | if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition) |
132 | arch_pwrdm->pwrdm_wait_transition(pwrdm); | |
e909d62a PW |
133 | pwrdm->state = pwrdm_read_pwrst(pwrdm); |
134 | pwrdm->state_counter[pwrdm->state] = 1; | |
135 | ||
136 | pr_debug("powerdomain: registered %s\n", pwrdm->name); | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
cde08f81 TG |
141 | static void _update_logic_membank_counters(struct powerdomain *pwrdm) |
142 | { | |
143 | int i; | |
144 | u8 prev_logic_pwrst, prev_mem_pwrst; | |
145 | ||
146 | prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm); | |
147 | if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) && | |
148 | (prev_logic_pwrst == PWRDM_POWER_OFF)) | |
149 | pwrdm->ret_logic_off_counter++; | |
150 | ||
151 | for (i = 0; i < pwrdm->banks; i++) { | |
152 | prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i); | |
153 | ||
154 | if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) && | |
155 | (prev_mem_pwrst == PWRDM_POWER_OFF)) | |
156 | pwrdm->ret_mem_off_counter[i]++; | |
157 | } | |
158 | } | |
159 | ||
ba20bb12 PDS |
160 | static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag) |
161 | { | |
162 | ||
c165a140 | 163 | int prev, next, state, trace_state = 0; |
ba20bb12 PDS |
164 | |
165 | if (pwrdm == NULL) | |
166 | return -EINVAL; | |
167 | ||
168 | state = pwrdm_read_pwrst(pwrdm); | |
169 | ||
170 | switch (flag) { | |
171 | case PWRDM_STATE_NOW: | |
172 | prev = pwrdm->state; | |
173 | break; | |
174 | case PWRDM_STATE_PREV: | |
175 | prev = pwrdm_read_prev_pwrst(pwrdm); | |
176 | if (pwrdm->state != prev) | |
177 | pwrdm->state_counter[prev]++; | |
cde08f81 TG |
178 | if (prev == PWRDM_POWER_RET) |
179 | _update_logic_membank_counters(pwrdm); | |
5e7c58dc JP |
180 | /* |
181 | * If the power domain did not hit the desired state, | |
182 | * generate a trace event with both the desired and hit states | |
183 | */ | |
c165a140 JP |
184 | next = pwrdm_read_next_pwrst(pwrdm); |
185 | if (next != prev) { | |
5e7c58dc | 186 | trace_state = (PWRDM_TRACE_STATES_FLAG | |
c165a140 | 187 | ((next & OMAP_POWERSTATE_MASK) << 8) | |
5e7c58dc | 188 | ((prev & OMAP_POWERSTATE_MASK) << 0)); |
0b9a29ad PM |
189 | trace_power_domain_target_rcuidle(pwrdm->name, |
190 | trace_state, | |
191 | smp_processor_id()); | |
5e7c58dc | 192 | } |
ba20bb12 PDS |
193 | break; |
194 | default: | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | if (state != prev) | |
199 | pwrdm->state_counter[state]++; | |
200 | ||
6199ab26 PDS |
201 | pm_dbg_update_time(pwrdm, prev); |
202 | ||
ba20bb12 PDS |
203 | pwrdm->state = state; |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
6199ab26 | 208 | static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused) |
ba20bb12 PDS |
209 | { |
210 | pwrdm_clear_all_prev_pwrst(pwrdm); | |
211 | _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); | |
212 | return 0; | |
213 | } | |
214 | ||
6199ab26 | 215 | static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused) |
ba20bb12 PDS |
216 | { |
217 | _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV); | |
218 | return 0; | |
219 | } | |
220 | ||
c4978fba PW |
221 | /** |
222 | * _pwrdm_save_clkdm_state_and_activate - prepare for power state change | |
223 | * @pwrdm: struct powerdomain * to operate on | |
224 | * @curr_pwrst: current power state of @pwrdm | |
225 | * @pwrst: power state to switch to | |
c4978fba PW |
226 | * |
227 | * Determine whether the powerdomain needs to be turned on before | |
228 | * attempting to switch power states. Called by | |
229 | * omap_set_pwrdm_state(). NOTE that if the powerdomain contains | |
230 | * multiple clockdomains, this code assumes that the first clockdomain | |
231 | * supports software-supervised wakeup mode - potentially a problem. | |
232 | * Returns the power state switch mode currently in use (see the | |
233 | * "Types of sleep_switch" comment above). | |
234 | */ | |
235 | static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm, | |
1d9a5425 | 236 | u8 curr_pwrst, u8 pwrst) |
c4978fba PW |
237 | { |
238 | u8 sleep_switch; | |
239 | ||
bd70f6eb | 240 | if (curr_pwrst < PWRDM_POWER_ON) { |
c4978fba PW |
241 | if (curr_pwrst > pwrst && |
242 | pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE && | |
243 | arch_pwrdm->pwrdm_set_lowpwrstchange) { | |
244 | sleep_switch = LOWPOWERSTATE_SWITCH; | |
245 | } else { | |
1d9a5425 | 246 | clkdm_deny_idle_nolock(pwrdm->pwrdm_clkdms[0]); |
c4978fba PW |
247 | sleep_switch = FORCEWAKEUP_SWITCH; |
248 | } | |
249 | } else { | |
250 | sleep_switch = ALREADYACTIVE_SWITCH; | |
251 | } | |
252 | ||
253 | return sleep_switch; | |
254 | } | |
255 | ||
256 | /** | |
257 | * _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change | |
258 | * @pwrdm: struct powerdomain * to operate on | |
259 | * @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate() | |
c4978fba PW |
260 | * |
261 | * Restore the clockdomain state perturbed by | |
262 | * _pwrdm_save_clkdm_state_and_activate(), and call the power state | |
263 | * bookkeeping code. Called by omap_set_pwrdm_state(). NOTE that if | |
264 | * the powerdomain contains multiple clockdomains, this assumes that | |
265 | * the first associated clockdomain supports either | |
266 | * hardware-supervised idle control in the register, or | |
267 | * software-supervised sleep. No return value. | |
268 | */ | |
269 | static void _pwrdm_restore_clkdm_state(struct powerdomain *pwrdm, | |
1d9a5425 | 270 | u8 sleep_switch) |
c4978fba PW |
271 | { |
272 | switch (sleep_switch) { | |
273 | case FORCEWAKEUP_SWITCH: | |
1d9a5425 | 274 | clkdm_allow_idle_nolock(pwrdm->pwrdm_clkdms[0]); |
c4978fba PW |
275 | break; |
276 | case LOWPOWERSTATE_SWITCH: | |
277 | if (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE && | |
278 | arch_pwrdm->pwrdm_set_lowpwrstchange) | |
279 | arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm); | |
3a090284 | 280 | pwrdm_state_switch_nolock(pwrdm); |
c4978fba PW |
281 | break; |
282 | } | |
283 | } | |
284 | ||
ad67ef68 PW |
285 | /* Public functions */ |
286 | ||
287 | /** | |
129c65ee PW |
288 | * pwrdm_register_platform_funcs - register powerdomain implementation fns |
289 | * @po: func pointers for arch specific implementations | |
ad67ef68 | 290 | * |
129c65ee PW |
291 | * Register the list of function pointers used to implement the |
292 | * powerdomain functions on different OMAP SoCs. Should be called | |
293 | * before any other pwrdm_register*() function. Returns -EINVAL if | |
294 | * @po is null, -EEXIST if platform functions have already been | |
295 | * registered, or 0 upon success. | |
ad67ef68 | 296 | */ |
129c65ee PW |
297 | int pwrdm_register_platform_funcs(struct pwrdm_ops *po) |
298 | { | |
299 | if (!po) | |
300 | return -EINVAL; | |
301 | ||
302 | if (arch_pwrdm) | |
303 | return -EEXIST; | |
304 | ||
305 | arch_pwrdm = po; | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | /** | |
311 | * pwrdm_register_pwrdms - register SoC powerdomains | |
312 | * @ps: pointer to an array of struct powerdomain to register | |
313 | * | |
314 | * Register the powerdomains available on a particular OMAP SoC. Must | |
315 | * be called after pwrdm_register_platform_funcs(). May be called | |
316 | * multiple times. Returns -EACCES if called before | |
317 | * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is | |
318 | * null; or 0 upon success. | |
319 | */ | |
320 | int pwrdm_register_pwrdms(struct powerdomain **ps) | |
ad67ef68 PW |
321 | { |
322 | struct powerdomain **p = NULL; | |
323 | ||
129c65ee PW |
324 | if (!arch_pwrdm) |
325 | return -EEXIST; | |
3b1e8b21 | 326 | |
129c65ee PW |
327 | if (!ps) |
328 | return -EINVAL; | |
329 | ||
330 | for (p = ps; *p; p++) | |
331 | _pwrdm_register(*p); | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | /** | |
337 | * pwrdm_complete_init - set up the powerdomain layer | |
338 | * | |
339 | * Do whatever is necessary to initialize registered powerdomains and | |
340 | * powerdomain code. Currently, this programs the next power state | |
341 | * for each powerdomain to ON. This prevents powerdomains from | |
342 | * unexpectedly losing context or entering high wakeup latency modes | |
343 | * with non-power-management-enabled kernels. Must be called after | |
344 | * pwrdm_register_pwrdms(). Returns -EACCES if called before | |
345 | * pwrdm_register_pwrdms(), or 0 upon success. | |
346 | */ | |
347 | int pwrdm_complete_init(void) | |
348 | { | |
349 | struct powerdomain *temp_p; | |
350 | ||
351 | if (list_empty(&pwrdm_list)) | |
352 | return -EACCES; | |
c956b753 RN |
353 | |
354 | list_for_each_entry(temp_p, &pwrdm_list, node) | |
355 | pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON); | |
129c65ee PW |
356 | |
357 | return 0; | |
ad67ef68 PW |
358 | } |
359 | ||
3a090284 PW |
360 | /** |
361 | * pwrdm_lock - acquire a Linux spinlock on a powerdomain | |
362 | * @pwrdm: struct powerdomain * to lock | |
363 | * | |
364 | * Acquire the powerdomain spinlock on @pwrdm. No return value. | |
365 | */ | |
366 | void pwrdm_lock(struct powerdomain *pwrdm) | |
367 | __acquires(&pwrdm->_lock) | |
368 | { | |
369 | spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags); | |
370 | } | |
371 | ||
372 | /** | |
373 | * pwrdm_unlock - release a Linux spinlock on a powerdomain | |
374 | * @pwrdm: struct powerdomain * to unlock | |
375 | * | |
376 | * Release the powerdomain spinlock on @pwrdm. No return value. | |
377 | */ | |
378 | void pwrdm_unlock(struct powerdomain *pwrdm) | |
379 | __releases(&pwrdm->_lock) | |
380 | { | |
381 | spin_unlock_irqrestore(&pwrdm->_lock, pwrdm->_lock_flags); | |
382 | } | |
383 | ||
ad67ef68 PW |
384 | /** |
385 | * pwrdm_lookup - look up a powerdomain by name, return a pointer | |
386 | * @name: name of powerdomain | |
387 | * | |
f0271d65 PW |
388 | * Find a registered powerdomain by its name @name. Returns a pointer |
389 | * to the struct powerdomain if found, or NULL otherwise. | |
ad67ef68 PW |
390 | */ |
391 | struct powerdomain *pwrdm_lookup(const char *name) | |
392 | { | |
393 | struct powerdomain *pwrdm; | |
ad67ef68 PW |
394 | |
395 | if (!name) | |
396 | return NULL; | |
397 | ||
ad67ef68 | 398 | pwrdm = _pwrdm_lookup(name); |
ad67ef68 PW |
399 | |
400 | return pwrdm; | |
401 | } | |
402 | ||
403 | /** | |
e909d62a | 404 | * pwrdm_for_each - call function on each registered clockdomain |
ad67ef68 PW |
405 | * @fn: callback function * |
406 | * | |
f0271d65 PW |
407 | * Call the supplied function @fn for each registered powerdomain. |
408 | * The callback function @fn can return anything but 0 to bail out | |
409 | * early from the iterator. Returns the last return value of the | |
410 | * callback function, which should be 0 for success or anything else | |
411 | * to indicate failure; or -EINVAL if the function pointer is null. | |
ad67ef68 | 412 | */ |
e909d62a PW |
413 | int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user), |
414 | void *user) | |
ad67ef68 PW |
415 | { |
416 | struct powerdomain *temp_pwrdm; | |
ad67ef68 PW |
417 | int ret = 0; |
418 | ||
419 | if (!fn) | |
420 | return -EINVAL; | |
421 | ||
ad67ef68 | 422 | list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { |
6199ab26 | 423 | ret = (*fn)(temp_pwrdm, user); |
ad67ef68 PW |
424 | if (ret) |
425 | break; | |
426 | } | |
ee894b18 AB |
427 | |
428 | return ret; | |
429 | } | |
430 | ||
8420bb13 PW |
431 | /** |
432 | * pwrdm_add_clkdm - add a clockdomain to a powerdomain | |
433 | * @pwrdm: struct powerdomain * to add the clockdomain to | |
434 | * @clkdm: struct clockdomain * to associate with a powerdomain | |
435 | * | |
f0271d65 | 436 | * Associate the clockdomain @clkdm with a powerdomain @pwrdm. This |
8420bb13 PW |
437 | * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if |
438 | * presented with invalid pointers; -ENOMEM if memory could not be allocated; | |
439 | * or 0 upon success. | |
440 | */ | |
441 | int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) | |
442 | { | |
8420bb13 PW |
443 | int i; |
444 | int ret = -EINVAL; | |
445 | ||
446 | if (!pwrdm || !clkdm) | |
447 | return -EINVAL; | |
448 | ||
7852ec05 PW |
449 | pr_debug("powerdomain: %s: associating clockdomain %s\n", |
450 | pwrdm->name, clkdm->name); | |
8420bb13 | 451 | |
8420bb13 PW |
452 | for (i = 0; i < PWRDM_MAX_CLKDMS; i++) { |
453 | if (!pwrdm->pwrdm_clkdms[i]) | |
454 | break; | |
455 | #ifdef DEBUG | |
456 | if (pwrdm->pwrdm_clkdms[i] == clkdm) { | |
457 | ret = -EINVAL; | |
458 | goto pac_exit; | |
459 | } | |
460 | #endif | |
461 | } | |
462 | ||
463 | if (i == PWRDM_MAX_CLKDMS) { | |
7852ec05 PW |
464 | pr_debug("powerdomain: %s: increase PWRDM_MAX_CLKDMS for clkdm %s\n", |
465 | pwrdm->name, clkdm->name); | |
8420bb13 PW |
466 | WARN_ON(1); |
467 | ret = -ENOMEM; | |
468 | goto pac_exit; | |
469 | } | |
470 | ||
471 | pwrdm->pwrdm_clkdms[i] = clkdm; | |
472 | ||
473 | ret = 0; | |
474 | ||
475 | pac_exit: | |
8420bb13 PW |
476 | return ret; |
477 | } | |
478 | ||
ad67ef68 PW |
479 | /** |
480 | * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain | |
481 | * @pwrdm: struct powerdomain * | |
482 | * | |
f0271d65 | 483 | * Return the number of controllable memory banks in powerdomain @pwrdm, |
ad67ef68 PW |
484 | * starting with 1. Returns -EINVAL if the powerdomain pointer is null. |
485 | */ | |
486 | int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm) | |
487 | { | |
488 | if (!pwrdm) | |
489 | return -EINVAL; | |
490 | ||
491 | return pwrdm->banks; | |
492 | } | |
493 | ||
494 | /** | |
495 | * pwrdm_set_next_pwrst - set next powerdomain power state | |
496 | * @pwrdm: struct powerdomain * to set | |
497 | * @pwrst: one of the PWRDM_POWER_* macros | |
498 | * | |
f0271d65 | 499 | * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain |
ad67ef68 PW |
500 | * may not enter this state immediately if the preconditions for this state |
501 | * have not been satisfied. Returns -EINVAL if the powerdomain pointer is | |
502 | * null or if the power state is invalid for the powerdomin, or returns 0 | |
503 | * upon success. | |
504 | */ | |
505 | int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) | |
506 | { | |
f327e07b RN |
507 | int ret = -EINVAL; |
508 | ||
ad67ef68 PW |
509 | if (!pwrdm) |
510 | return -EINVAL; | |
511 | ||
512 | if (!(pwrdm->pwrsts & (1 << pwrst))) | |
513 | return -EINVAL; | |
514 | ||
7852ec05 | 515 | pr_debug("powerdomain: %s: setting next powerstate to %0x\n", |
ad67ef68 PW |
516 | pwrdm->name, pwrst); |
517 | ||
5e7c58dc JP |
518 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) { |
519 | /* Trace the pwrdm desired target state */ | |
0b9a29ad PM |
520 | trace_power_domain_target_rcuidle(pwrdm->name, pwrst, |
521 | smp_processor_id()); | |
5e7c58dc | 522 | /* Program the pwrdm desired target state */ |
f327e07b | 523 | ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst); |
5e7c58dc | 524 | } |
ad67ef68 | 525 | |
f327e07b | 526 | return ret; |
ad67ef68 PW |
527 | } |
528 | ||
529 | /** | |
530 | * pwrdm_read_next_pwrst - get next powerdomain power state | |
531 | * @pwrdm: struct powerdomain * to get power state | |
532 | * | |
f0271d65 | 533 | * Return the powerdomain @pwrdm's next power state. Returns -EINVAL |
ad67ef68 PW |
534 | * if the powerdomain pointer is null or returns the next power state |
535 | * upon success. | |
536 | */ | |
537 | int pwrdm_read_next_pwrst(struct powerdomain *pwrdm) | |
538 | { | |
f327e07b RN |
539 | int ret = -EINVAL; |
540 | ||
ad67ef68 PW |
541 | if (!pwrdm) |
542 | return -EINVAL; | |
543 | ||
f327e07b RN |
544 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst) |
545 | ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm); | |
546 | ||
547 | return ret; | |
ad67ef68 PW |
548 | } |
549 | ||
550 | /** | |
551 | * pwrdm_read_pwrst - get current powerdomain power state | |
552 | * @pwrdm: struct powerdomain * to get power state | |
553 | * | |
f0271d65 | 554 | * Return the powerdomain @pwrdm's current power state. Returns -EINVAL |
ad67ef68 | 555 | * if the powerdomain pointer is null or returns the current power state |
d49cae92 JH |
556 | * upon success. Note that if the power domain only supports the ON state |
557 | * then just return ON as the current state. | |
ad67ef68 PW |
558 | */ |
559 | int pwrdm_read_pwrst(struct powerdomain *pwrdm) | |
560 | { | |
f327e07b RN |
561 | int ret = -EINVAL; |
562 | ||
ad67ef68 PW |
563 | if (!pwrdm) |
564 | return -EINVAL; | |
565 | ||
d49cae92 JH |
566 | if (pwrdm->pwrsts == PWRSTS_ON) |
567 | return PWRDM_POWER_ON; | |
568 | ||
f327e07b RN |
569 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst) |
570 | ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm); | |
571 | ||
572 | return ret; | |
ad67ef68 PW |
573 | } |
574 | ||
575 | /** | |
576 | * pwrdm_read_prev_pwrst - get previous powerdomain power state | |
577 | * @pwrdm: struct powerdomain * to get previous power state | |
578 | * | |
f0271d65 | 579 | * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL |
ad67ef68 PW |
580 | * if the powerdomain pointer is null or returns the previous power state |
581 | * upon success. | |
582 | */ | |
583 | int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) | |
584 | { | |
f327e07b RN |
585 | int ret = -EINVAL; |
586 | ||
ad67ef68 PW |
587 | if (!pwrdm) |
588 | return -EINVAL; | |
589 | ||
f327e07b RN |
590 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst) |
591 | ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm); | |
592 | ||
593 | return ret; | |
ad67ef68 PW |
594 | } |
595 | ||
596 | /** | |
597 | * pwrdm_set_logic_retst - set powerdomain logic power state upon retention | |
598 | * @pwrdm: struct powerdomain * to set | |
599 | * @pwrst: one of the PWRDM_POWER_* macros | |
600 | * | |
f0271d65 PW |
601 | * Set the next power state @pwrst that the logic portion of the |
602 | * powerdomain @pwrdm will enter when the powerdomain enters retention. | |
603 | * This will be either RETENTION or OFF, if supported. Returns | |
604 | * -EINVAL if the powerdomain pointer is null or the target power | |
605 | * state is not not supported, or returns 0 upon success. | |
ad67ef68 PW |
606 | */ |
607 | int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) | |
608 | { | |
12627578 | 609 | int ret = -EINVAL; |
2bc4ef71 | 610 | |
ad67ef68 PW |
611 | if (!pwrdm) |
612 | return -EINVAL; | |
613 | ||
614 | if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst))) | |
615 | return -EINVAL; | |
616 | ||
7852ec05 | 617 | pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n", |
ad67ef68 PW |
618 | pwrdm->name, pwrst); |
619 | ||
12627578 RN |
620 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst) |
621 | ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst); | |
ad67ef68 | 622 | |
12627578 | 623 | return ret; |
ad67ef68 PW |
624 | } |
625 | ||
626 | /** | |
627 | * pwrdm_set_mem_onst - set memory power state while powerdomain ON | |
628 | * @pwrdm: struct powerdomain * to set | |
629 | * @bank: memory bank number to set (0-3) | |
630 | * @pwrst: one of the PWRDM_POWER_* macros | |
631 | * | |
f0271d65 PW |
632 | * Set the next power state @pwrst that memory bank @bank of the |
633 | * powerdomain @pwrdm will enter when the powerdomain enters the ON | |
634 | * state. @bank will be a number from 0 to 3, and represents different | |
635 | * types of memory, depending on the powerdomain. Returns -EINVAL if | |
636 | * the powerdomain pointer is null or the target power state is not | |
637 | * not supported for this memory bank, -EEXIST if the target memory | |
638 | * bank does not exist or is not controllable, or returns 0 upon | |
639 | * success. | |
ad67ef68 PW |
640 | */ |
641 | int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) | |
642 | { | |
9b7fc907 | 643 | int ret = -EINVAL; |
ad67ef68 PW |
644 | |
645 | if (!pwrdm) | |
646 | return -EINVAL; | |
647 | ||
648 | if (pwrdm->banks < (bank + 1)) | |
649 | return -EEXIST; | |
650 | ||
651 | if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst))) | |
652 | return -EINVAL; | |
653 | ||
7852ec05 PW |
654 | pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n", |
655 | pwrdm->name, bank, pwrst); | |
ad67ef68 | 656 | |
9b7fc907 RN |
657 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst) |
658 | ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst); | |
ad67ef68 | 659 | |
9b7fc907 | 660 | return ret; |
ad67ef68 PW |
661 | } |
662 | ||
663 | /** | |
664 | * pwrdm_set_mem_retst - set memory power state while powerdomain in RET | |
665 | * @pwrdm: struct powerdomain * to set | |
666 | * @bank: memory bank number to set (0-3) | |
667 | * @pwrst: one of the PWRDM_POWER_* macros | |
668 | * | |
f0271d65 PW |
669 | * Set the next power state @pwrst that memory bank @bank of the |
670 | * powerdomain @pwrdm will enter when the powerdomain enters the | |
671 | * RETENTION state. Bank will be a number from 0 to 3, and represents | |
672 | * different types of memory, depending on the powerdomain. @pwrst | |
673 | * will be either RETENTION or OFF, if supported. Returns -EINVAL if | |
674 | * the powerdomain pointer is null or the target power state is not | |
675 | * not supported for this memory bank, -EEXIST if the target memory | |
676 | * bank does not exist or is not controllable, or returns 0 upon | |
677 | * success. | |
ad67ef68 PW |
678 | */ |
679 | int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) | |
680 | { | |
9b7fc907 | 681 | int ret = -EINVAL; |
ad67ef68 PW |
682 | |
683 | if (!pwrdm) | |
684 | return -EINVAL; | |
685 | ||
686 | if (pwrdm->banks < (bank + 1)) | |
687 | return -EEXIST; | |
688 | ||
689 | if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst))) | |
690 | return -EINVAL; | |
691 | ||
7852ec05 PW |
692 | pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n", |
693 | pwrdm->name, bank, pwrst); | |
ad67ef68 | 694 | |
9b7fc907 RN |
695 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst) |
696 | ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst); | |
ad67ef68 | 697 | |
9b7fc907 | 698 | return ret; |
ad67ef68 PW |
699 | } |
700 | ||
701 | /** | |
702 | * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state | |
703 | * @pwrdm: struct powerdomain * to get current logic retention power state | |
704 | * | |
f0271d65 PW |
705 | * Return the power state that the logic portion of powerdomain @pwrdm |
706 | * will enter when the powerdomain enters retention. Returns -EINVAL | |
707 | * if the powerdomain pointer is null or returns the logic retention | |
708 | * power state upon success. | |
ad67ef68 PW |
709 | */ |
710 | int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) | |
711 | { | |
12627578 RN |
712 | int ret = -EINVAL; |
713 | ||
ad67ef68 PW |
714 | if (!pwrdm) |
715 | return -EINVAL; | |
716 | ||
12627578 RN |
717 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst) |
718 | ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm); | |
719 | ||
720 | return ret; | |
ad67ef68 PW |
721 | } |
722 | ||
723 | /** | |
724 | * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state | |
725 | * @pwrdm: struct powerdomain * to get previous logic power state | |
726 | * | |
f0271d65 PW |
727 | * Return the powerdomain @pwrdm's previous logic power state. Returns |
728 | * -EINVAL if the powerdomain pointer is null or returns the previous | |
729 | * logic power state upon success. | |
ad67ef68 PW |
730 | */ |
731 | int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) | |
732 | { | |
12627578 RN |
733 | int ret = -EINVAL; |
734 | ||
ad67ef68 PW |
735 | if (!pwrdm) |
736 | return -EINVAL; | |
737 | ||
12627578 RN |
738 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst) |
739 | ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm); | |
740 | ||
741 | return ret; | |
ad67ef68 PW |
742 | } |
743 | ||
1e3d0d2b TG |
744 | /** |
745 | * pwrdm_read_logic_retst - get next powerdomain logic power state | |
746 | * @pwrdm: struct powerdomain * to get next logic power state | |
747 | * | |
748 | * Return the powerdomain pwrdm's logic power state. Returns -EINVAL | |
749 | * if the powerdomain pointer is null or returns the next logic | |
750 | * power state upon success. | |
751 | */ | |
752 | int pwrdm_read_logic_retst(struct powerdomain *pwrdm) | |
753 | { | |
12627578 RN |
754 | int ret = -EINVAL; |
755 | ||
1e3d0d2b TG |
756 | if (!pwrdm) |
757 | return -EINVAL; | |
758 | ||
12627578 RN |
759 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst) |
760 | ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm); | |
761 | ||
762 | return ret; | |
1e3d0d2b TG |
763 | } |
764 | ||
ad67ef68 PW |
765 | /** |
766 | * pwrdm_read_mem_pwrst - get current memory bank power state | |
767 | * @pwrdm: struct powerdomain * to get current memory bank power state | |
768 | * @bank: memory bank number (0-3) | |
769 | * | |
f0271d65 PW |
770 | * Return the powerdomain @pwrdm's current memory power state for bank |
771 | * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if | |
ad67ef68 PW |
772 | * the target memory bank does not exist or is not controllable, or |
773 | * returns the current memory power state upon success. | |
774 | */ | |
775 | int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) | |
776 | { | |
9b7fc907 | 777 | int ret = -EINVAL; |
ad67ef68 PW |
778 | |
779 | if (!pwrdm) | |
9b7fc907 | 780 | return ret; |
ad67ef68 PW |
781 | |
782 | if (pwrdm->banks < (bank + 1)) | |
9b7fc907 | 783 | return ret; |
ad67ef68 | 784 | |
3863c74b TG |
785 | if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) |
786 | bank = 1; | |
787 | ||
9b7fc907 RN |
788 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst) |
789 | ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank); | |
ad67ef68 | 790 | |
9b7fc907 | 791 | return ret; |
ad67ef68 PW |
792 | } |
793 | ||
794 | /** | |
795 | * pwrdm_read_prev_mem_pwrst - get previous memory bank power state | |
796 | * @pwrdm: struct powerdomain * to get previous memory bank power state | |
797 | * @bank: memory bank number (0-3) | |
798 | * | |
f0271d65 PW |
799 | * Return the powerdomain @pwrdm's previous memory power state for |
800 | * bank @bank. Returns -EINVAL if the powerdomain pointer is null, | |
801 | * -EEXIST if the target memory bank does not exist or is not | |
802 | * controllable, or returns the previous memory power state upon | |
803 | * success. | |
ad67ef68 PW |
804 | */ |
805 | int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) | |
806 | { | |
9b7fc907 | 807 | int ret = -EINVAL; |
ad67ef68 PW |
808 | |
809 | if (!pwrdm) | |
9b7fc907 | 810 | return ret; |
ad67ef68 PW |
811 | |
812 | if (pwrdm->banks < (bank + 1)) | |
9b7fc907 | 813 | return ret; |
ad67ef68 | 814 | |
3863c74b TG |
815 | if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) |
816 | bank = 1; | |
817 | ||
9b7fc907 RN |
818 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst) |
819 | ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank); | |
ad67ef68 | 820 | |
9b7fc907 | 821 | return ret; |
ad67ef68 PW |
822 | } |
823 | ||
1e3d0d2b TG |
824 | /** |
825 | * pwrdm_read_mem_retst - get next memory bank power state | |
826 | * @pwrdm: struct powerdomain * to get mext memory bank power state | |
827 | * @bank: memory bank number (0-3) | |
828 | * | |
829 | * Return the powerdomain pwrdm's next memory power state for bank | |
830 | * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if | |
831 | * the target memory bank does not exist or is not controllable, or | |
832 | * returns the next memory power state upon success. | |
833 | */ | |
834 | int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) | |
835 | { | |
9b7fc907 | 836 | int ret = -EINVAL; |
1e3d0d2b TG |
837 | |
838 | if (!pwrdm) | |
9b7fc907 | 839 | return ret; |
1e3d0d2b TG |
840 | |
841 | if (pwrdm->banks < (bank + 1)) | |
9b7fc907 | 842 | return ret; |
1e3d0d2b | 843 | |
9b7fc907 RN |
844 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst) |
845 | ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank); | |
1e3d0d2b | 846 | |
9b7fc907 | 847 | return ret; |
1e3d0d2b TG |
848 | } |
849 | ||
ad67ef68 PW |
850 | /** |
851 | * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm | |
852 | * @pwrdm: struct powerdomain * to clear | |
853 | * | |
f0271d65 PW |
854 | * Clear the powerdomain's previous power state register @pwrdm. |
855 | * Clears the entire register, including logic and memory bank | |
856 | * previous power states. Returns -EINVAL if the powerdomain pointer | |
857 | * is null, or returns 0 upon success. | |
ad67ef68 PW |
858 | */ |
859 | int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) | |
860 | { | |
9b7fc907 RN |
861 | int ret = -EINVAL; |
862 | ||
ad67ef68 | 863 | if (!pwrdm) |
9b7fc907 | 864 | return ret; |
ad67ef68 PW |
865 | |
866 | /* | |
867 | * XXX should get the powerdomain's current state here; | |
868 | * warn & fail if it is not ON. | |
869 | */ | |
870 | ||
7852ec05 | 871 | pr_debug("powerdomain: %s: clearing previous power state reg\n", |
ad67ef68 PW |
872 | pwrdm->name); |
873 | ||
9b7fc907 RN |
874 | if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst) |
875 | ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm); | |
ad67ef68 | 876 | |
9b7fc907 | 877 | return ret; |
ad67ef68 PW |
878 | } |
879 | ||
0b7cbfb5 PW |
880 | /** |
881 | * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm | |
882 | * @pwrdm: struct powerdomain * | |
883 | * | |
884 | * Enable automatic context save-and-restore upon power state change | |
f0271d65 PW |
885 | * for some devices in the powerdomain @pwrdm. Warning: this only |
886 | * affects a subset of devices in a powerdomain; check the TRM | |
887 | * closely. Returns -EINVAL if the powerdomain pointer is null or if | |
888 | * the powerdomain does not support automatic save-and-restore, or | |
889 | * returns 0 upon success. | |
0b7cbfb5 PW |
890 | */ |
891 | int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) | |
892 | { | |
9b7fc907 RN |
893 | int ret = -EINVAL; |
894 | ||
0b7cbfb5 | 895 | if (!pwrdm) |
9b7fc907 | 896 | return ret; |
0b7cbfb5 PW |
897 | |
898 | if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) | |
9b7fc907 | 899 | return ret; |
0b7cbfb5 | 900 | |
7852ec05 | 901 | pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm->name); |
0b7cbfb5 | 902 | |
9b7fc907 RN |
903 | if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar) |
904 | ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm); | |
0b7cbfb5 | 905 | |
9b7fc907 | 906 | return ret; |
0b7cbfb5 PW |
907 | } |
908 | ||
909 | /** | |
910 | * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm | |
911 | * @pwrdm: struct powerdomain * | |
912 | * | |
913 | * Disable automatic context save-and-restore upon power state change | |
f0271d65 PW |
914 | * for some devices in the powerdomain @pwrdm. Warning: this only |
915 | * affects a subset of devices in a powerdomain; check the TRM | |
916 | * closely. Returns -EINVAL if the powerdomain pointer is null or if | |
917 | * the powerdomain does not support automatic save-and-restore, or | |
918 | * returns 0 upon success. | |
0b7cbfb5 PW |
919 | */ |
920 | int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) | |
921 | { | |
9b7fc907 RN |
922 | int ret = -EINVAL; |
923 | ||
0b7cbfb5 | 924 | if (!pwrdm) |
9b7fc907 | 925 | return ret; |
0b7cbfb5 PW |
926 | |
927 | if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) | |
9b7fc907 | 928 | return ret; |
0b7cbfb5 | 929 | |
7852ec05 | 930 | pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm->name); |
0b7cbfb5 | 931 | |
9b7fc907 RN |
932 | if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar) |
933 | ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm); | |
0b7cbfb5 | 934 | |
9b7fc907 | 935 | return ret; |
0b7cbfb5 PW |
936 | } |
937 | ||
938 | /** | |
939 | * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR | |
940 | * @pwrdm: struct powerdomain * | |
941 | * | |
f0271d65 | 942 | * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore |
0b7cbfb5 PW |
943 | * for some devices, or 0 if it does not. |
944 | */ | |
945 | bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm) | |
946 | { | |
947 | return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0; | |
948 | } | |
949 | ||
3a090284 | 950 | int pwrdm_state_switch_nolock(struct powerdomain *pwrdm) |
ba20bb12 | 951 | { |
8b8c3c78 SS |
952 | int ret; |
953 | ||
f8457c2d PW |
954 | if (!pwrdm || !arch_pwrdm) |
955 | return -EINVAL; | |
956 | ||
957 | ret = arch_pwrdm->pwrdm_wait_transition(pwrdm); | |
8b8c3c78 SS |
958 | if (!ret) |
959 | ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); | |
960 | ||
961 | return ret; | |
ba20bb12 PDS |
962 | } |
963 | ||
3a090284 PW |
964 | int __deprecated pwrdm_state_switch(struct powerdomain *pwrdm) |
965 | { | |
966 | int ret; | |
967 | ||
968 | pwrdm_lock(pwrdm); | |
969 | ret = pwrdm_state_switch_nolock(pwrdm); | |
970 | pwrdm_unlock(pwrdm); | |
971 | ||
972 | return ret; | |
973 | } | |
974 | ||
e0555489 | 975 | int pwrdm_pre_transition(struct powerdomain *pwrdm) |
ba20bb12 | 976 | { |
e0555489 KH |
977 | if (pwrdm) |
978 | _pwrdm_pre_transition_cb(pwrdm, NULL); | |
979 | else | |
980 | pwrdm_for_each(_pwrdm_pre_transition_cb, NULL); | |
981 | ||
ba20bb12 PDS |
982 | return 0; |
983 | } | |
984 | ||
e0555489 | 985 | int pwrdm_post_transition(struct powerdomain *pwrdm) |
ba20bb12 | 986 | { |
e0555489 KH |
987 | if (pwrdm) |
988 | _pwrdm_post_transition_cb(pwrdm, NULL); | |
989 | else | |
990 | pwrdm_for_each(_pwrdm_post_transition_cb, NULL); | |
991 | ||
ba20bb12 PDS |
992 | return 0; |
993 | } | |
7f595674 | 994 | |
bd002d7b NM |
995 | /** |
996 | * pwrdm_get_valid_lp_state() - Find best match deep power state | |
997 | * @pwrdm: power domain for which we want to find best match | |
998 | * @is_logic_state: Are we looking for logic state match here? Should | |
999 | * be one of PWRDM_xxx macro values | |
1000 | * @req_state: requested power state | |
1001 | * | |
1002 | * Returns: closest match for requested power state. default fallback | |
1003 | * is RET for logic state and ON for power state. | |
1004 | * | |
1005 | * This does a search from the power domain data looking for the | |
1006 | * closest valid power domain state that the hardware can achieve. | |
1007 | * PRCM definitions for PWRSTCTRL allows us to program whatever | |
1008 | * configuration we'd like, and PRCM will actually attempt such | |
1009 | * a transition, however if the powerdomain does not actually support it, | |
1010 | * we endup with a hung system. The valid power domain states are already | |
1011 | * available in our powerdomain data files. So this function tries to do | |
1012 | * the following: | |
1013 | * a) find if we have an exact match to the request - no issues. | |
1014 | * b) else find if a deeper power state is possible. | |
1015 | * c) failing which, it tries to find closest higher power state for the | |
1016 | * request. | |
1017 | */ | |
1018 | u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm, | |
1019 | bool is_logic_state, u8 req_state) | |
1020 | { | |
1021 | u8 pwrdm_states = is_logic_state ? pwrdm->pwrsts_logic_ret : | |
1022 | pwrdm->pwrsts; | |
1023 | /* For logic, ret is highest and others, ON is highest */ | |
1024 | u8 default_pwrst = is_logic_state ? PWRDM_POWER_RET : PWRDM_POWER_ON; | |
1025 | u8 new_pwrst; | |
1026 | bool found; | |
1027 | ||
1028 | /* If it is already supported, nothing to search */ | |
1029 | if (pwrdm_states & BIT(req_state)) | |
1030 | return req_state; | |
1031 | ||
1032 | if (!req_state) | |
1033 | goto up_search; | |
1034 | ||
1035 | /* | |
1036 | * So, we dont have a exact match | |
1037 | * Can we get a deeper power state match? | |
1038 | */ | |
1039 | new_pwrst = req_state - 1; | |
1040 | found = true; | |
1041 | while (!(pwrdm_states & BIT(new_pwrst))) { | |
1042 | /* No match even at OFF? Not available */ | |
1043 | if (new_pwrst == PWRDM_POWER_OFF) { | |
1044 | found = false; | |
1045 | break; | |
1046 | } | |
1047 | new_pwrst--; | |
1048 | } | |
1049 | ||
1050 | if (found) | |
1051 | goto done; | |
1052 | ||
1053 | up_search: | |
1054 | /* OK, no deeper ones, can we get a higher match? */ | |
1055 | new_pwrst = req_state + 1; | |
1056 | while (!(pwrdm_states & BIT(new_pwrst))) { | |
1057 | if (new_pwrst > PWRDM_POWER_ON) { | |
1058 | WARN(1, "powerdomain: %s: Fix max powerstate to ON\n", | |
1059 | pwrdm->name); | |
1060 | return PWRDM_POWER_ON; | |
1061 | } | |
1062 | ||
1063 | if (new_pwrst == default_pwrst) | |
1064 | break; | |
1065 | new_pwrst++; | |
1066 | } | |
1067 | done: | |
1068 | return new_pwrst; | |
1069 | } | |
1070 | ||
c4978fba PW |
1071 | /** |
1072 | * omap_set_pwrdm_state - change a powerdomain's current power state | |
1073 | * @pwrdm: struct powerdomain * to change the power state of | |
1074 | * @pwrst: power state to change to | |
1075 | * | |
1076 | * Change the current hardware power state of the powerdomain | |
1077 | * represented by @pwrdm to the power state represented by @pwrst. | |
1078 | * Returns -EINVAL if @pwrdm is null or invalid or if the | |
1079 | * powerdomain's current power state could not be read, or returns 0 | |
1080 | * upon success or if @pwrdm does not support @pwrst or any | |
1081 | * lower-power state. XXX Should not return 0 if the @pwrdm does not | |
1082 | * support @pwrst or any lower-power state: this should be an error. | |
1083 | */ | |
1084 | int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst) | |
1085 | { | |
bd70f6eb PW |
1086 | u8 next_pwrst, sleep_switch; |
1087 | int curr_pwrst; | |
c4978fba | 1088 | int ret = 0; |
c4978fba PW |
1089 | |
1090 | if (!pwrdm || IS_ERR(pwrdm)) | |
1091 | return -EINVAL; | |
1092 | ||
1093 | while (!(pwrdm->pwrsts & (1 << pwrst))) { | |
1094 | if (pwrst == PWRDM_POWER_OFF) | |
1095 | return ret; | |
1096 | pwrst--; | |
1097 | } | |
1098 | ||
3a090284 PW |
1099 | pwrdm_lock(pwrdm); |
1100 | ||
c4978fba | 1101 | curr_pwrst = pwrdm_read_pwrst(pwrdm); |
bd70f6eb PW |
1102 | if (curr_pwrst < 0) { |
1103 | ret = -EINVAL; | |
1104 | goto osps_out; | |
1105 | } | |
1106 | ||
c4978fba PW |
1107 | next_pwrst = pwrdm_read_next_pwrst(pwrdm); |
1108 | if (curr_pwrst == pwrst && next_pwrst == pwrst) | |
3a090284 | 1109 | goto osps_out; |
c4978fba PW |
1110 | |
1111 | sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst, | |
1d9a5425 | 1112 | pwrst); |
c4978fba PW |
1113 | |
1114 | ret = pwrdm_set_next_pwrst(pwrdm, pwrst); | |
1115 | if (ret) | |
1116 | pr_err("%s: unable to set power state of powerdomain: %s\n", | |
1117 | __func__, pwrdm->name); | |
1118 | ||
1d9a5425 | 1119 | _pwrdm_restore_clkdm_state(pwrdm, sleep_switch); |
c4978fba | 1120 | |
3a090284 PW |
1121 | osps_out: |
1122 | pwrdm_unlock(pwrdm); | |
1123 | ||
c4978fba PW |
1124 | return ret; |
1125 | } | |
1126 | ||
7f595674 KH |
1127 | /** |
1128 | * pwrdm_get_context_loss_count - get powerdomain's context loss count | |
1129 | * @pwrdm: struct powerdomain * to wait for | |
1130 | * | |
1131 | * Context loss count is the sum of powerdomain off-mode counter, the | |
fc013873 | 1132 | * logic off counter and the per-bank memory off counter. Returns negative |
7f595674 KH |
1133 | * (and WARNs) upon error, otherwise, returns the context loss count. |
1134 | */ | |
fc013873 | 1135 | int pwrdm_get_context_loss_count(struct powerdomain *pwrdm) |
7f595674 KH |
1136 | { |
1137 | int i, count; | |
1138 | ||
1139 | if (!pwrdm) { | |
1140 | WARN(1, "powerdomain: %s: pwrdm is null\n", __func__); | |
fc013873 | 1141 | return -ENODEV; |
7f595674 KH |
1142 | } |
1143 | ||
1144 | count = pwrdm->state_counter[PWRDM_POWER_OFF]; | |
1145 | count += pwrdm->ret_logic_off_counter; | |
1146 | ||
1147 | for (i = 0; i < pwrdm->banks; i++) | |
1148 | count += pwrdm->ret_mem_off_counter[i]; | |
1149 | ||
fc013873 TV |
1150 | /* |
1151 | * Context loss count has to be a non-negative value. Clear the sign | |
1152 | * bit to get a value range from 0 to INT_MAX. | |
1153 | */ | |
1154 | count &= INT_MAX; | |
1155 | ||
1156 | pr_debug("powerdomain: %s: context loss count = %d\n", | |
7f595674 KH |
1157 | pwrdm->name, count); |
1158 | ||
1159 | return count; | |
1160 | } | |
694606c4 PW |
1161 | |
1162 | /** | |
1163 | * pwrdm_can_ever_lose_context - can this powerdomain ever lose context? | |
1164 | * @pwrdm: struct powerdomain * | |
1165 | * | |
1166 | * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain | |
1167 | * can lose either memory or logic context or if @pwrdm is invalid, or | |
1168 | * returns 0 otherwise. This function is not concerned with how the | |
1169 | * powerdomain registers are programmed (i.e., to go off or not); it's | |
1170 | * concerned with whether it's ever possible for this powerdomain to | |
1171 | * go off while some other part of the chip is active. This function | |
1172 | * assumes that every powerdomain can go to either ON or INACTIVE. | |
1173 | */ | |
1174 | bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm) | |
1175 | { | |
1176 | int i; | |
1177 | ||
62f0f39b | 1178 | if (!pwrdm) { |
694606c4 PW |
1179 | pr_debug("powerdomain: %s: invalid powerdomain pointer\n", |
1180 | __func__); | |
1181 | return 1; | |
1182 | } | |
1183 | ||
1184 | if (pwrdm->pwrsts & PWRSTS_OFF) | |
1185 | return 1; | |
1186 | ||
1187 | if (pwrdm->pwrsts & PWRSTS_RET) { | |
1188 | if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF) | |
1189 | return 1; | |
1190 | ||
1191 | for (i = 0; i < pwrdm->banks; i++) | |
1192 | if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF) | |
1193 | return 1; | |
1194 | } | |
1195 | ||
1196 | for (i = 0; i < pwrdm->banks; i++) | |
1197 | if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF) | |
1198 | return 1; | |
1199 | ||
1200 | return 0; | |
1201 | } |