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ad67ef68 PW |
1 | /* |
2 | * OMAP powerdomain control | |
3 | * | |
4 | * Copyright (C) 2007-2008 Texas Instruments, Inc. | |
5 | * Copyright (C) 2007-2008 Nokia Corporation | |
6 | * | |
7 | * Written by Paul Walmsley | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | #ifdef CONFIG_OMAP_DEBUG_POWERDOMAIN | |
14 | # define DEBUG | |
15 | #endif | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/spinlock.h> | |
22 | #include <linux/list.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/err.h> | |
25 | #include <linux/io.h> | |
26 | ||
27 | #include <asm/atomic.h> | |
28 | ||
29 | #include "cm.h" | |
30 | #include "cm-regbits-34xx.h" | |
31 | #include "prm.h" | |
32 | #include "prm-regbits-34xx.h" | |
33 | ||
ce491cf8 TL |
34 | #include <plat/cpu.h> |
35 | #include <plat/powerdomain.h> | |
36 | #include <plat/clockdomain.h> | |
ad67ef68 | 37 | |
6199ab26 PDS |
38 | #include "pm.h" |
39 | ||
ba20bb12 PDS |
40 | enum { |
41 | PWRDM_STATE_NOW = 0, | |
42 | PWRDM_STATE_PREV, | |
43 | }; | |
44 | ||
ad67ef68 PW |
45 | /* pwrdm_list contains all registered struct powerdomains */ |
46 | static LIST_HEAD(pwrdm_list); | |
47 | ||
48 | /* | |
49 | * pwrdm_rwlock protects pwrdm_list add and del ops - also reused to | |
50 | * protect pwrdm_clkdms[] during clkdm add/del ops | |
51 | */ | |
52 | static DEFINE_RWLOCK(pwrdm_rwlock); | |
53 | ||
54 | ||
55 | /* Private functions */ | |
56 | ||
57 | static u32 prm_read_mod_bits_shift(s16 domain, s16 idx, u32 mask) | |
58 | { | |
59 | u32 v; | |
60 | ||
61 | v = prm_read_mod_reg(domain, idx); | |
62 | v &= mask; | |
63 | v >>= __ffs(mask); | |
64 | ||
65 | return v; | |
66 | } | |
67 | ||
68 | static struct powerdomain *_pwrdm_lookup(const char *name) | |
69 | { | |
70 | struct powerdomain *pwrdm, *temp_pwrdm; | |
71 | ||
72 | pwrdm = NULL; | |
73 | ||
74 | list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { | |
75 | if (!strcmp(name, temp_pwrdm->name)) { | |
76 | pwrdm = temp_pwrdm; | |
77 | break; | |
78 | } | |
79 | } | |
80 | ||
81 | return pwrdm; | |
82 | } | |
83 | ||
84 | /* _pwrdm_deps_lookup - look up the specified powerdomain in a pwrdm list */ | |
85 | static struct powerdomain *_pwrdm_deps_lookup(struct powerdomain *pwrdm, | |
86 | struct pwrdm_dep *deps) | |
87 | { | |
88 | struct pwrdm_dep *pd; | |
89 | ||
90 | if (!pwrdm || !deps || !omap_chip_is(pwrdm->omap_chip)) | |
91 | return ERR_PTR(-EINVAL); | |
92 | ||
5d113262 | 93 | for (pd = deps; pd->pwrdm_name; pd++) { |
ad67ef68 PW |
94 | |
95 | if (!omap_chip_is(pd->omap_chip)) | |
96 | continue; | |
97 | ||
98 | if (!pd->pwrdm && pd->pwrdm_name) | |
99 | pd->pwrdm = pwrdm_lookup(pd->pwrdm_name); | |
100 | ||
101 | if (pd->pwrdm == pwrdm) | |
102 | break; | |
103 | ||
104 | } | |
105 | ||
5d113262 | 106 | if (!pd->pwrdm_name) |
ad67ef68 PW |
107 | return ERR_PTR(-ENOENT); |
108 | ||
109 | return pd->pwrdm; | |
110 | } | |
111 | ||
ba20bb12 PDS |
112 | static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag) |
113 | { | |
114 | ||
115 | int prev; | |
116 | int state; | |
117 | ||
118 | if (pwrdm == NULL) | |
119 | return -EINVAL; | |
120 | ||
121 | state = pwrdm_read_pwrst(pwrdm); | |
122 | ||
123 | switch (flag) { | |
124 | case PWRDM_STATE_NOW: | |
125 | prev = pwrdm->state; | |
126 | break; | |
127 | case PWRDM_STATE_PREV: | |
128 | prev = pwrdm_read_prev_pwrst(pwrdm); | |
129 | if (pwrdm->state != prev) | |
130 | pwrdm->state_counter[prev]++; | |
131 | break; | |
132 | default: | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | if (state != prev) | |
137 | pwrdm->state_counter[state]++; | |
138 | ||
6199ab26 PDS |
139 | pm_dbg_update_time(pwrdm, prev); |
140 | ||
ba20bb12 PDS |
141 | pwrdm->state = state; |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
6199ab26 | 146 | static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused) |
ba20bb12 PDS |
147 | { |
148 | pwrdm_clear_all_prev_pwrst(pwrdm); | |
149 | _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); | |
150 | return 0; | |
151 | } | |
152 | ||
6199ab26 | 153 | static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused) |
ba20bb12 PDS |
154 | { |
155 | _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | static __init void _pwrdm_setup(struct powerdomain *pwrdm) | |
160 | { | |
161 | int i; | |
162 | ||
163 | for (i = 0; i < 4; i++) | |
164 | pwrdm->state_counter[i] = 0; | |
165 | ||
166 | pwrdm_wait_transition(pwrdm); | |
167 | pwrdm->state = pwrdm_read_pwrst(pwrdm); | |
168 | pwrdm->state_counter[pwrdm->state] = 1; | |
169 | ||
170 | } | |
ad67ef68 PW |
171 | |
172 | /* Public functions */ | |
173 | ||
174 | /** | |
175 | * pwrdm_init - set up the powerdomain layer | |
176 | * | |
177 | * Loop through the list of powerdomains, registering all that are | |
178 | * available on the current CPU. If pwrdm_list is supplied and not | |
179 | * null, all of the referenced powerdomains will be registered. No | |
180 | * return value. | |
181 | */ | |
182 | void pwrdm_init(struct powerdomain **pwrdm_list) | |
183 | { | |
184 | struct powerdomain **p = NULL; | |
185 | ||
ba20bb12 PDS |
186 | if (pwrdm_list) { |
187 | for (p = pwrdm_list; *p; p++) { | |
ad67ef68 | 188 | pwrdm_register(*p); |
ba20bb12 PDS |
189 | _pwrdm_setup(*p); |
190 | } | |
191 | } | |
ad67ef68 PW |
192 | } |
193 | ||
194 | /** | |
195 | * pwrdm_register - register a powerdomain | |
196 | * @pwrdm: struct powerdomain * to register | |
197 | * | |
198 | * Adds a powerdomain to the internal powerdomain list. Returns | |
199 | * -EINVAL if given a null pointer, -EEXIST if a powerdomain is | |
200 | * already registered by the provided name, or 0 upon success. | |
201 | */ | |
202 | int pwrdm_register(struct powerdomain *pwrdm) | |
203 | { | |
204 | unsigned long flags; | |
205 | int ret = -EINVAL; | |
206 | ||
207 | if (!pwrdm) | |
208 | return -EINVAL; | |
209 | ||
210 | if (!omap_chip_is(pwrdm->omap_chip)) | |
211 | return -EINVAL; | |
212 | ||
213 | write_lock_irqsave(&pwrdm_rwlock, flags); | |
214 | if (_pwrdm_lookup(pwrdm->name)) { | |
215 | ret = -EEXIST; | |
216 | goto pr_unlock; | |
217 | } | |
218 | ||
219 | list_add(&pwrdm->node, &pwrdm_list); | |
220 | ||
221 | pr_debug("powerdomain: registered %s\n", pwrdm->name); | |
222 | ret = 0; | |
223 | ||
224 | pr_unlock: | |
225 | write_unlock_irqrestore(&pwrdm_rwlock, flags); | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
230 | /** | |
231 | * pwrdm_unregister - unregister a powerdomain | |
232 | * @pwrdm: struct powerdomain * to unregister | |
233 | * | |
234 | * Removes a powerdomain from the internal powerdomain list. Returns | |
235 | * -EINVAL if pwrdm argument is NULL. | |
236 | */ | |
237 | int pwrdm_unregister(struct powerdomain *pwrdm) | |
238 | { | |
239 | unsigned long flags; | |
240 | ||
241 | if (!pwrdm) | |
242 | return -EINVAL; | |
243 | ||
244 | write_lock_irqsave(&pwrdm_rwlock, flags); | |
245 | list_del(&pwrdm->node); | |
246 | write_unlock_irqrestore(&pwrdm_rwlock, flags); | |
247 | ||
248 | pr_debug("powerdomain: unregistered %s\n", pwrdm->name); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | /** | |
254 | * pwrdm_lookup - look up a powerdomain by name, return a pointer | |
255 | * @name: name of powerdomain | |
256 | * | |
257 | * Find a registered powerdomain by its name. Returns a pointer to the | |
258 | * struct powerdomain if found, or NULL otherwise. | |
259 | */ | |
260 | struct powerdomain *pwrdm_lookup(const char *name) | |
261 | { | |
262 | struct powerdomain *pwrdm; | |
263 | unsigned long flags; | |
264 | ||
265 | if (!name) | |
266 | return NULL; | |
267 | ||
268 | read_lock_irqsave(&pwrdm_rwlock, flags); | |
269 | pwrdm = _pwrdm_lookup(name); | |
270 | read_unlock_irqrestore(&pwrdm_rwlock, flags); | |
271 | ||
272 | return pwrdm; | |
273 | } | |
274 | ||
275 | /** | |
ee894b18 | 276 | * pwrdm_for_each_nolock - call function on each registered clockdomain |
ad67ef68 PW |
277 | * @fn: callback function * |
278 | * | |
279 | * Call the supplied function for each registered powerdomain. The | |
280 | * callback function can return anything but 0 to bail out early from | |
ee894b18 AB |
281 | * the iterator. Returns the last return value of the callback function, which |
282 | * should be 0 for success or anything else to indicate failure; or -EINVAL if | |
283 | * the function pointer is null. | |
ad67ef68 | 284 | */ |
ee894b18 AB |
285 | int pwrdm_for_each_nolock(int (*fn)(struct powerdomain *pwrdm, void *user), |
286 | void *user) | |
ad67ef68 PW |
287 | { |
288 | struct powerdomain *temp_pwrdm; | |
ad67ef68 PW |
289 | int ret = 0; |
290 | ||
291 | if (!fn) | |
292 | return -EINVAL; | |
293 | ||
ad67ef68 | 294 | list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { |
6199ab26 | 295 | ret = (*fn)(temp_pwrdm, user); |
ad67ef68 PW |
296 | if (ret) |
297 | break; | |
298 | } | |
ee894b18 AB |
299 | |
300 | return ret; | |
301 | } | |
302 | ||
303 | /** | |
304 | * pwrdm_for_each - call function on each registered clockdomain | |
305 | * @fn: callback function * | |
306 | * | |
307 | * This function is the same as 'pwrdm_for_each_nolock()', but keeps the | |
308 | * &pwrdm_rwlock locked for reading, so no powerdomain structure manipulation | |
309 | * functions should be called from the callback, although hardware powerdomain | |
310 | * control functions are fine. | |
311 | */ | |
312 | int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user), | |
313 | void *user) | |
314 | { | |
315 | unsigned long flags; | |
316 | int ret; | |
317 | ||
318 | read_lock_irqsave(&pwrdm_rwlock, flags); | |
319 | ret = pwrdm_for_each_nolock(fn, user); | |
ad67ef68 PW |
320 | read_unlock_irqrestore(&pwrdm_rwlock, flags); |
321 | ||
322 | return ret; | |
323 | } | |
324 | ||
8420bb13 PW |
325 | /** |
326 | * pwrdm_add_clkdm - add a clockdomain to a powerdomain | |
327 | * @pwrdm: struct powerdomain * to add the clockdomain to | |
328 | * @clkdm: struct clockdomain * to associate with a powerdomain | |
329 | * | |
330 | * Associate the clockdomain 'clkdm' with a powerdomain 'pwrdm'. This | |
331 | * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if | |
332 | * presented with invalid pointers; -ENOMEM if memory could not be allocated; | |
333 | * or 0 upon success. | |
334 | */ | |
335 | int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) | |
336 | { | |
337 | unsigned long flags; | |
338 | int i; | |
339 | int ret = -EINVAL; | |
340 | ||
341 | if (!pwrdm || !clkdm) | |
342 | return -EINVAL; | |
343 | ||
344 | pr_debug("powerdomain: associating clockdomain %s with powerdomain " | |
345 | "%s\n", clkdm->name, pwrdm->name); | |
346 | ||
347 | write_lock_irqsave(&pwrdm_rwlock, flags); | |
348 | ||
349 | for (i = 0; i < PWRDM_MAX_CLKDMS; i++) { | |
350 | if (!pwrdm->pwrdm_clkdms[i]) | |
351 | break; | |
352 | #ifdef DEBUG | |
353 | if (pwrdm->pwrdm_clkdms[i] == clkdm) { | |
354 | ret = -EINVAL; | |
355 | goto pac_exit; | |
356 | } | |
357 | #endif | |
358 | } | |
359 | ||
360 | if (i == PWRDM_MAX_CLKDMS) { | |
361 | pr_debug("powerdomain: increase PWRDM_MAX_CLKDMS for " | |
362 | "pwrdm %s clkdm %s\n", pwrdm->name, clkdm->name); | |
363 | WARN_ON(1); | |
364 | ret = -ENOMEM; | |
365 | goto pac_exit; | |
366 | } | |
367 | ||
368 | pwrdm->pwrdm_clkdms[i] = clkdm; | |
369 | ||
370 | ret = 0; | |
371 | ||
372 | pac_exit: | |
373 | write_unlock_irqrestore(&pwrdm_rwlock, flags); | |
374 | ||
375 | return ret; | |
376 | } | |
377 | ||
378 | /** | |
379 | * pwrdm_del_clkdm - remove a clockdomain from a powerdomain | |
380 | * @pwrdm: struct powerdomain * to add the clockdomain to | |
381 | * @clkdm: struct clockdomain * to associate with a powerdomain | |
382 | * | |
383 | * Dissociate the clockdomain 'clkdm' from the powerdomain | |
384 | * 'pwrdm'. Returns -EINVAL if presented with invalid pointers; | |
385 | * -ENOENT if the clkdm was not associated with the powerdomain, or 0 | |
386 | * upon success. | |
387 | */ | |
388 | int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) | |
389 | { | |
390 | unsigned long flags; | |
391 | int ret = -EINVAL; | |
392 | int i; | |
393 | ||
394 | if (!pwrdm || !clkdm) | |
395 | return -EINVAL; | |
396 | ||
397 | pr_debug("powerdomain: dissociating clockdomain %s from powerdomain " | |
398 | "%s\n", clkdm->name, pwrdm->name); | |
399 | ||
400 | write_lock_irqsave(&pwrdm_rwlock, flags); | |
401 | ||
402 | for (i = 0; i < PWRDM_MAX_CLKDMS; i++) | |
403 | if (pwrdm->pwrdm_clkdms[i] == clkdm) | |
404 | break; | |
405 | ||
406 | if (i == PWRDM_MAX_CLKDMS) { | |
407 | pr_debug("powerdomain: clkdm %s not associated with pwrdm " | |
408 | "%s ?!\n", clkdm->name, pwrdm->name); | |
409 | ret = -ENOENT; | |
410 | goto pdc_exit; | |
411 | } | |
412 | ||
413 | pwrdm->pwrdm_clkdms[i] = NULL; | |
414 | ||
415 | ret = 0; | |
416 | ||
417 | pdc_exit: | |
418 | write_unlock_irqrestore(&pwrdm_rwlock, flags); | |
419 | ||
420 | return ret; | |
421 | } | |
422 | ||
423 | /** | |
424 | * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm | |
425 | * @pwrdm: struct powerdomain * to iterate over | |
426 | * @fn: callback function * | |
427 | * | |
428 | * Call the supplied function for each clockdomain in the powerdomain | |
429 | * 'pwrdm'. The callback function can return anything but 0 to bail | |
430 | * out early from the iterator. The callback function is called with | |
431 | * the pwrdm_rwlock held for reading, so no powerdomain structure | |
432 | * manipulation functions should be called from the callback, although | |
433 | * hardware powerdomain control functions are fine. Returns -EINVAL | |
434 | * if presented with invalid pointers; or passes along the last return | |
435 | * value of the callback function, which should be 0 for success or | |
436 | * anything else to indicate failure. | |
437 | */ | |
438 | int pwrdm_for_each_clkdm(struct powerdomain *pwrdm, | |
439 | int (*fn)(struct powerdomain *pwrdm, | |
440 | struct clockdomain *clkdm)) | |
441 | { | |
442 | unsigned long flags; | |
443 | int ret = 0; | |
444 | int i; | |
445 | ||
446 | if (!fn) | |
447 | return -EINVAL; | |
448 | ||
449 | read_lock_irqsave(&pwrdm_rwlock, flags); | |
450 | ||
451 | for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++) | |
452 | ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]); | |
453 | ||
454 | read_unlock_irqrestore(&pwrdm_rwlock, flags); | |
455 | ||
456 | return ret; | |
457 | } | |
458 | ||
459 | ||
ad67ef68 PW |
460 | /** |
461 | * pwrdm_add_wkdep - add a wakeup dependency from pwrdm2 to pwrdm1 | |
462 | * @pwrdm1: wake this struct powerdomain * up (dependent) | |
463 | * @pwrdm2: when this struct powerdomain * wakes up (source) | |
464 | * | |
465 | * When the powerdomain represented by pwrdm2 wakes up (due to an | |
466 | * interrupt), wake up pwrdm1. Implemented in hardware on the OMAP, | |
467 | * this feature is designed to reduce wakeup latency of the dependent | |
468 | * powerdomain. Returns -EINVAL if presented with invalid powerdomain | |
469 | * pointers, -ENOENT if pwrdm2 cannot wake up pwrdm1 in hardware, or | |
470 | * 0 upon success. | |
471 | */ | |
472 | int pwrdm_add_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) | |
473 | { | |
474 | struct powerdomain *p; | |
475 | ||
476 | if (!pwrdm1) | |
477 | return -EINVAL; | |
478 | ||
479 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs); | |
480 | if (IS_ERR(p)) { | |
481 | pr_debug("powerdomain: hardware cannot set/clear wake up of " | |
482 | "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name); | |
483 | return IS_ERR(p); | |
484 | } | |
485 | ||
486 | pr_debug("powerdomain: hardware will wake up %s when %s wakes up\n", | |
487 | pwrdm1->name, pwrdm2->name); | |
488 | ||
489 | prm_set_mod_reg_bits((1 << pwrdm2->dep_bit), | |
490 | pwrdm1->prcm_offs, PM_WKDEP); | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | /** | |
496 | * pwrdm_del_wkdep - remove a wakeup dependency from pwrdm2 to pwrdm1 | |
497 | * @pwrdm1: wake this struct powerdomain * up (dependent) | |
498 | * @pwrdm2: when this struct powerdomain * wakes up (source) | |
499 | * | |
500 | * Remove a wakeup dependency that causes pwrdm1 to wake up when pwrdm2 | |
501 | * wakes up. Returns -EINVAL if presented with invalid powerdomain | |
502 | * pointers, -ENOENT if pwrdm2 cannot wake up pwrdm1 in hardware, or | |
503 | * 0 upon success. | |
504 | */ | |
505 | int pwrdm_del_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) | |
506 | { | |
507 | struct powerdomain *p; | |
508 | ||
509 | if (!pwrdm1) | |
510 | return -EINVAL; | |
511 | ||
512 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs); | |
513 | if (IS_ERR(p)) { | |
514 | pr_debug("powerdomain: hardware cannot set/clear wake up of " | |
515 | "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name); | |
516 | return IS_ERR(p); | |
517 | } | |
518 | ||
519 | pr_debug("powerdomain: hardware will no longer wake up %s after %s " | |
520 | "wakes up\n", pwrdm1->name, pwrdm2->name); | |
521 | ||
522 | prm_clear_mod_reg_bits((1 << pwrdm2->dep_bit), | |
523 | pwrdm1->prcm_offs, PM_WKDEP); | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | /** | |
529 | * pwrdm_read_wkdep - read wakeup dependency state from pwrdm2 to pwrdm1 | |
530 | * @pwrdm1: wake this struct powerdomain * up (dependent) | |
531 | * @pwrdm2: when this struct powerdomain * wakes up (source) | |
532 | * | |
533 | * Return 1 if a hardware wakeup dependency exists wherein pwrdm1 will be | |
534 | * awoken when pwrdm2 wakes up; 0 if dependency is not set; -EINVAL | |
535 | * if either powerdomain pointer is invalid; or -ENOENT if the hardware | |
536 | * is incapable. | |
537 | * | |
538 | * REVISIT: Currently this function only represents software-controllable | |
539 | * wakeup dependencies. Wakeup dependencies fixed in hardware are not | |
540 | * yet handled here. | |
541 | */ | |
542 | int pwrdm_read_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) | |
543 | { | |
544 | struct powerdomain *p; | |
545 | ||
546 | if (!pwrdm1) | |
547 | return -EINVAL; | |
548 | ||
549 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs); | |
550 | if (IS_ERR(p)) { | |
551 | pr_debug("powerdomain: hardware cannot set/clear wake up of " | |
552 | "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name); | |
553 | return IS_ERR(p); | |
554 | } | |
555 | ||
556 | return prm_read_mod_bits_shift(pwrdm1->prcm_offs, PM_WKDEP, | |
557 | (1 << pwrdm2->dep_bit)); | |
558 | } | |
559 | ||
560 | /** | |
561 | * pwrdm_add_sleepdep - add a sleep dependency from pwrdm2 to pwrdm1 | |
562 | * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent) | |
563 | * @pwrdm2: when this struct powerdomain * is active (source) | |
564 | * | |
565 | * Prevent pwrdm1 from automatically going inactive (and then to | |
566 | * retention or off) if pwrdm2 is still active. Returns -EINVAL if | |
567 | * presented with invalid powerdomain pointers or called on a machine | |
568 | * that does not support software-configurable hardware sleep dependencies, | |
569 | * -ENOENT if the specified dependency cannot be set in hardware, or | |
570 | * 0 upon success. | |
571 | */ | |
572 | int pwrdm_add_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) | |
573 | { | |
574 | struct powerdomain *p; | |
575 | ||
576 | if (!pwrdm1) | |
577 | return -EINVAL; | |
578 | ||
579 | if (!cpu_is_omap34xx()) | |
580 | return -EINVAL; | |
581 | ||
582 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs); | |
583 | if (IS_ERR(p)) { | |
584 | pr_debug("powerdomain: hardware cannot set/clear sleep " | |
585 | "dependency affecting %s from %s\n", pwrdm1->name, | |
586 | pwrdm2->name); | |
587 | return IS_ERR(p); | |
588 | } | |
589 | ||
590 | pr_debug("powerdomain: will prevent %s from sleeping if %s is active\n", | |
591 | pwrdm1->name, pwrdm2->name); | |
592 | ||
593 | cm_set_mod_reg_bits((1 << pwrdm2->dep_bit), | |
594 | pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP); | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
599 | /** | |
600 | * pwrdm_del_sleepdep - remove a sleep dependency from pwrdm2 to pwrdm1 | |
601 | * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent) | |
602 | * @pwrdm2: when this struct powerdomain * is active (source) | |
603 | * | |
604 | * Allow pwrdm1 to automatically go inactive (and then to retention or | |
605 | * off), independent of the activity state of pwrdm2. Returns -EINVAL | |
606 | * if presented with invalid powerdomain pointers or called on a machine | |
607 | * that does not support software-configurable hardware sleep dependencies, | |
608 | * -ENOENT if the specified dependency cannot be cleared in hardware, or | |
609 | * 0 upon success. | |
610 | */ | |
611 | int pwrdm_del_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) | |
612 | { | |
613 | struct powerdomain *p; | |
614 | ||
615 | if (!pwrdm1) | |
616 | return -EINVAL; | |
617 | ||
618 | if (!cpu_is_omap34xx()) | |
619 | return -EINVAL; | |
620 | ||
621 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs); | |
622 | if (IS_ERR(p)) { | |
623 | pr_debug("powerdomain: hardware cannot set/clear sleep " | |
624 | "dependency affecting %s from %s\n", pwrdm1->name, | |
625 | pwrdm2->name); | |
626 | return IS_ERR(p); | |
627 | } | |
628 | ||
629 | pr_debug("powerdomain: will no longer prevent %s from sleeping if " | |
630 | "%s is active\n", pwrdm1->name, pwrdm2->name); | |
631 | ||
632 | cm_clear_mod_reg_bits((1 << pwrdm2->dep_bit), | |
633 | pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP); | |
634 | ||
635 | return 0; | |
636 | } | |
637 | ||
638 | /** | |
639 | * pwrdm_read_sleepdep - read sleep dependency state from pwrdm2 to pwrdm1 | |
640 | * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent) | |
641 | * @pwrdm2: when this struct powerdomain * is active (source) | |
642 | * | |
643 | * Return 1 if a hardware sleep dependency exists wherein pwrdm1 will | |
644 | * not be allowed to automatically go inactive if pwrdm2 is active; | |
645 | * 0 if pwrdm1's automatic power state inactivity transition is independent | |
646 | * of pwrdm2's; -EINVAL if either powerdomain pointer is invalid or called | |
647 | * on a machine that does not support software-configurable hardware sleep | |
648 | * dependencies; or -ENOENT if the hardware is incapable. | |
649 | * | |
650 | * REVISIT: Currently this function only represents software-controllable | |
651 | * sleep dependencies. Sleep dependencies fixed in hardware are not | |
652 | * yet handled here. | |
653 | */ | |
654 | int pwrdm_read_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) | |
655 | { | |
656 | struct powerdomain *p; | |
657 | ||
658 | if (!pwrdm1) | |
659 | return -EINVAL; | |
660 | ||
661 | if (!cpu_is_omap34xx()) | |
662 | return -EINVAL; | |
663 | ||
664 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs); | |
665 | if (IS_ERR(p)) { | |
666 | pr_debug("powerdomain: hardware cannot set/clear sleep " | |
667 | "dependency affecting %s from %s\n", pwrdm1->name, | |
668 | pwrdm2->name); | |
669 | return IS_ERR(p); | |
670 | } | |
671 | ||
672 | return prm_read_mod_bits_shift(pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP, | |
673 | (1 << pwrdm2->dep_bit)); | |
674 | } | |
675 | ||
676 | /** | |
677 | * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain | |
678 | * @pwrdm: struct powerdomain * | |
679 | * | |
680 | * Return the number of controllable memory banks in powerdomain pwrdm, | |
681 | * starting with 1. Returns -EINVAL if the powerdomain pointer is null. | |
682 | */ | |
683 | int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm) | |
684 | { | |
685 | if (!pwrdm) | |
686 | return -EINVAL; | |
687 | ||
688 | return pwrdm->banks; | |
689 | } | |
690 | ||
691 | /** | |
692 | * pwrdm_set_next_pwrst - set next powerdomain power state | |
693 | * @pwrdm: struct powerdomain * to set | |
694 | * @pwrst: one of the PWRDM_POWER_* macros | |
695 | * | |
696 | * Set the powerdomain pwrdm's next power state to pwrst. The powerdomain | |
697 | * may not enter this state immediately if the preconditions for this state | |
698 | * have not been satisfied. Returns -EINVAL if the powerdomain pointer is | |
699 | * null or if the power state is invalid for the powerdomin, or returns 0 | |
700 | * upon success. | |
701 | */ | |
702 | int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) | |
703 | { | |
704 | if (!pwrdm) | |
705 | return -EINVAL; | |
706 | ||
707 | if (!(pwrdm->pwrsts & (1 << pwrst))) | |
708 | return -EINVAL; | |
709 | ||
710 | pr_debug("powerdomain: setting next powerstate for %s to %0x\n", | |
711 | pwrdm->name, pwrst); | |
712 | ||
713 | prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK, | |
714 | (pwrst << OMAP_POWERSTATE_SHIFT), | |
715 | pwrdm->prcm_offs, PM_PWSTCTRL); | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
720 | /** | |
721 | * pwrdm_read_next_pwrst - get next powerdomain power state | |
722 | * @pwrdm: struct powerdomain * to get power state | |
723 | * | |
724 | * Return the powerdomain pwrdm's next power state. Returns -EINVAL | |
725 | * if the powerdomain pointer is null or returns the next power state | |
726 | * upon success. | |
727 | */ | |
728 | int pwrdm_read_next_pwrst(struct powerdomain *pwrdm) | |
729 | { | |
730 | if (!pwrdm) | |
731 | return -EINVAL; | |
732 | ||
733 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTCTRL, | |
734 | OMAP_POWERSTATE_MASK); | |
735 | } | |
736 | ||
737 | /** | |
738 | * pwrdm_read_pwrst - get current powerdomain power state | |
739 | * @pwrdm: struct powerdomain * to get power state | |
740 | * | |
741 | * Return the powerdomain pwrdm's current power state. Returns -EINVAL | |
742 | * if the powerdomain pointer is null or returns the current power state | |
743 | * upon success. | |
744 | */ | |
745 | int pwrdm_read_pwrst(struct powerdomain *pwrdm) | |
746 | { | |
747 | if (!pwrdm) | |
748 | return -EINVAL; | |
749 | ||
750 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST, | |
751 | OMAP_POWERSTATEST_MASK); | |
752 | } | |
753 | ||
754 | /** | |
755 | * pwrdm_read_prev_pwrst - get previous powerdomain power state | |
756 | * @pwrdm: struct powerdomain * to get previous power state | |
757 | * | |
758 | * Return the powerdomain pwrdm's previous power state. Returns -EINVAL | |
759 | * if the powerdomain pointer is null or returns the previous power state | |
760 | * upon success. | |
761 | */ | |
762 | int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) | |
763 | { | |
764 | if (!pwrdm) | |
765 | return -EINVAL; | |
766 | ||
767 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST, | |
768 | OMAP3430_LASTPOWERSTATEENTERED_MASK); | |
769 | } | |
770 | ||
771 | /** | |
772 | * pwrdm_set_logic_retst - set powerdomain logic power state upon retention | |
773 | * @pwrdm: struct powerdomain * to set | |
774 | * @pwrst: one of the PWRDM_POWER_* macros | |
775 | * | |
776 | * Set the next power state that the logic portion of the powerdomain | |
777 | * pwrdm will enter when the powerdomain enters retention. This will | |
778 | * be either RETENTION or OFF, if supported. Returns -EINVAL if the | |
779 | * powerdomain pointer is null or the target power state is not not | |
780 | * supported, or returns 0 upon success. | |
781 | */ | |
782 | int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) | |
783 | { | |
784 | if (!pwrdm) | |
785 | return -EINVAL; | |
786 | ||
787 | if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst))) | |
788 | return -EINVAL; | |
789 | ||
790 | pr_debug("powerdomain: setting next logic powerstate for %s to %0x\n", | |
791 | pwrdm->name, pwrst); | |
792 | ||
793 | /* | |
794 | * The register bit names below may not correspond to the | |
795 | * actual names of the bits in each powerdomain's register, | |
796 | * but the type of value returned is the same for each | |
797 | * powerdomain. | |
798 | */ | |
799 | prm_rmw_mod_reg_bits(OMAP3430_LOGICL1CACHERETSTATE, | |
800 | (pwrst << __ffs(OMAP3430_LOGICL1CACHERETSTATE)), | |
801 | pwrdm->prcm_offs, PM_PWSTCTRL); | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
806 | /** | |
807 | * pwrdm_set_mem_onst - set memory power state while powerdomain ON | |
808 | * @pwrdm: struct powerdomain * to set | |
809 | * @bank: memory bank number to set (0-3) | |
810 | * @pwrst: one of the PWRDM_POWER_* macros | |
811 | * | |
812 | * Set the next power state that memory bank x of the powerdomain | |
813 | * pwrdm will enter when the powerdomain enters the ON state. Bank | |
814 | * will be a number from 0 to 3, and represents different types of | |
815 | * memory, depending on the powerdomain. Returns -EINVAL if the | |
816 | * powerdomain pointer is null or the target power state is not not | |
817 | * supported for this memory bank, -EEXIST if the target memory bank | |
818 | * does not exist or is not controllable, or returns 0 upon success. | |
819 | */ | |
820 | int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) | |
821 | { | |
822 | u32 m; | |
823 | ||
824 | if (!pwrdm) | |
825 | return -EINVAL; | |
826 | ||
827 | if (pwrdm->banks < (bank + 1)) | |
828 | return -EEXIST; | |
829 | ||
830 | if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst))) | |
831 | return -EINVAL; | |
832 | ||
833 | pr_debug("powerdomain: setting next memory powerstate for domain %s " | |
834 | "bank %0x while pwrdm-ON to %0x\n", pwrdm->name, bank, pwrst); | |
835 | ||
836 | /* | |
837 | * The register bit names below may not correspond to the | |
838 | * actual names of the bits in each powerdomain's register, | |
839 | * but the type of value returned is the same for each | |
840 | * powerdomain. | |
841 | */ | |
842 | switch (bank) { | |
843 | case 0: | |
844 | m = OMAP3430_SHAREDL1CACHEFLATONSTATE_MASK; | |
845 | break; | |
846 | case 1: | |
847 | m = OMAP3430_L1FLATMEMONSTATE_MASK; | |
848 | break; | |
849 | case 2: | |
850 | m = OMAP3430_SHAREDL2CACHEFLATONSTATE_MASK; | |
851 | break; | |
852 | case 3: | |
853 | m = OMAP3430_L2FLATMEMONSTATE_MASK; | |
854 | break; | |
855 | default: | |
856 | WARN_ON(1); /* should never happen */ | |
857 | return -EEXIST; | |
858 | } | |
859 | ||
860 | prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), | |
861 | pwrdm->prcm_offs, PM_PWSTCTRL); | |
862 | ||
863 | return 0; | |
864 | } | |
865 | ||
866 | /** | |
867 | * pwrdm_set_mem_retst - set memory power state while powerdomain in RET | |
868 | * @pwrdm: struct powerdomain * to set | |
869 | * @bank: memory bank number to set (0-3) | |
870 | * @pwrst: one of the PWRDM_POWER_* macros | |
871 | * | |
872 | * Set the next power state that memory bank x of the powerdomain | |
873 | * pwrdm will enter when the powerdomain enters the RETENTION state. | |
874 | * Bank will be a number from 0 to 3, and represents different types | |
875 | * of memory, depending on the powerdomain. pwrst will be either | |
876 | * RETENTION or OFF, if supported. Returns -EINVAL if the powerdomain | |
877 | * pointer is null or the target power state is not not supported for | |
878 | * this memory bank, -EEXIST if the target memory bank does not exist | |
879 | * or is not controllable, or returns 0 upon success. | |
880 | */ | |
881 | int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) | |
882 | { | |
883 | u32 m; | |
884 | ||
885 | if (!pwrdm) | |
886 | return -EINVAL; | |
887 | ||
888 | if (pwrdm->banks < (bank + 1)) | |
889 | return -EEXIST; | |
890 | ||
891 | if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst))) | |
892 | return -EINVAL; | |
893 | ||
894 | pr_debug("powerdomain: setting next memory powerstate for domain %s " | |
895 | "bank %0x while pwrdm-RET to %0x\n", pwrdm->name, bank, pwrst); | |
896 | ||
897 | /* | |
898 | * The register bit names below may not correspond to the | |
899 | * actual names of the bits in each powerdomain's register, | |
900 | * but the type of value returned is the same for each | |
901 | * powerdomain. | |
902 | */ | |
903 | switch (bank) { | |
904 | case 0: | |
905 | m = OMAP3430_SHAREDL1CACHEFLATRETSTATE; | |
906 | break; | |
907 | case 1: | |
908 | m = OMAP3430_L1FLATMEMRETSTATE; | |
909 | break; | |
910 | case 2: | |
911 | m = OMAP3430_SHAREDL2CACHEFLATRETSTATE; | |
912 | break; | |
913 | case 3: | |
914 | m = OMAP3430_L2FLATMEMRETSTATE; | |
915 | break; | |
916 | default: | |
917 | WARN_ON(1); /* should never happen */ | |
918 | return -EEXIST; | |
919 | } | |
920 | ||
921 | prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs, | |
922 | PM_PWSTCTRL); | |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
927 | /** | |
928 | * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state | |
929 | * @pwrdm: struct powerdomain * to get current logic retention power state | |
930 | * | |
931 | * Return the current power state that the logic portion of | |
932 | * powerdomain pwrdm will enter | |
933 | * Returns -EINVAL if the powerdomain pointer is null or returns the | |
934 | * current logic retention power state upon success. | |
935 | */ | |
936 | int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) | |
937 | { | |
938 | if (!pwrdm) | |
939 | return -EINVAL; | |
940 | ||
941 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST, | |
942 | OMAP3430_LOGICSTATEST); | |
943 | } | |
944 | ||
945 | /** | |
946 | * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state | |
947 | * @pwrdm: struct powerdomain * to get previous logic power state | |
948 | * | |
949 | * Return the powerdomain pwrdm's logic power state. Returns -EINVAL | |
950 | * if the powerdomain pointer is null or returns the previous logic | |
951 | * power state upon success. | |
952 | */ | |
953 | int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) | |
954 | { | |
955 | if (!pwrdm) | |
956 | return -EINVAL; | |
957 | ||
958 | /* | |
959 | * The register bit names below may not correspond to the | |
960 | * actual names of the bits in each powerdomain's register, | |
961 | * but the type of value returned is the same for each | |
962 | * powerdomain. | |
963 | */ | |
964 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST, | |
965 | OMAP3430_LASTLOGICSTATEENTERED); | |
966 | } | |
967 | ||
968 | /** | |
969 | * pwrdm_read_mem_pwrst - get current memory bank power state | |
970 | * @pwrdm: struct powerdomain * to get current memory bank power state | |
971 | * @bank: memory bank number (0-3) | |
972 | * | |
973 | * Return the powerdomain pwrdm's current memory power state for bank | |
974 | * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if | |
975 | * the target memory bank does not exist or is not controllable, or | |
976 | * returns the current memory power state upon success. | |
977 | */ | |
978 | int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) | |
979 | { | |
980 | u32 m; | |
981 | ||
982 | if (!pwrdm) | |
983 | return -EINVAL; | |
984 | ||
985 | if (pwrdm->banks < (bank + 1)) | |
986 | return -EEXIST; | |
987 | ||
988 | /* | |
989 | * The register bit names below may not correspond to the | |
990 | * actual names of the bits in each powerdomain's register, | |
991 | * but the type of value returned is the same for each | |
992 | * powerdomain. | |
993 | */ | |
994 | switch (bank) { | |
995 | case 0: | |
996 | m = OMAP3430_SHAREDL1CACHEFLATSTATEST_MASK; | |
997 | break; | |
998 | case 1: | |
999 | m = OMAP3430_L1FLATMEMSTATEST_MASK; | |
1000 | break; | |
1001 | case 2: | |
1002 | m = OMAP3430_SHAREDL2CACHEFLATSTATEST_MASK; | |
1003 | break; | |
1004 | case 3: | |
1005 | m = OMAP3430_L2FLATMEMSTATEST_MASK; | |
1006 | break; | |
1007 | default: | |
1008 | WARN_ON(1); /* should never happen */ | |
1009 | return -EEXIST; | |
1010 | } | |
1011 | ||
1012 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST, m); | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * pwrdm_read_prev_mem_pwrst - get previous memory bank power state | |
1017 | * @pwrdm: struct powerdomain * to get previous memory bank power state | |
1018 | * @bank: memory bank number (0-3) | |
1019 | * | |
1020 | * Return the powerdomain pwrdm's previous memory power state for bank | |
1021 | * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if | |
1022 | * the target memory bank does not exist or is not controllable, or | |
1023 | * returns the previous memory power state upon success. | |
1024 | */ | |
1025 | int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) | |
1026 | { | |
1027 | u32 m; | |
1028 | ||
1029 | if (!pwrdm) | |
1030 | return -EINVAL; | |
1031 | ||
1032 | if (pwrdm->banks < (bank + 1)) | |
1033 | return -EEXIST; | |
1034 | ||
1035 | /* | |
1036 | * The register bit names below may not correspond to the | |
1037 | * actual names of the bits in each powerdomain's register, | |
1038 | * but the type of value returned is the same for each | |
1039 | * powerdomain. | |
1040 | */ | |
1041 | switch (bank) { | |
1042 | case 0: | |
1043 | m = OMAP3430_LASTMEM1STATEENTERED_MASK; | |
1044 | break; | |
1045 | case 1: | |
1046 | m = OMAP3430_LASTMEM2STATEENTERED_MASK; | |
1047 | break; | |
1048 | case 2: | |
1049 | m = OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK; | |
1050 | break; | |
1051 | case 3: | |
1052 | m = OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK; | |
1053 | break; | |
1054 | default: | |
1055 | WARN_ON(1); /* should never happen */ | |
1056 | return -EEXIST; | |
1057 | } | |
1058 | ||
1059 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, | |
1060 | OMAP3430_PM_PREPWSTST, m); | |
1061 | } | |
1062 | ||
1063 | /** | |
1064 | * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm | |
1065 | * @pwrdm: struct powerdomain * to clear | |
1066 | * | |
1067 | * Clear the powerdomain's previous power state register. Clears the | |
1068 | * entire register, including logic and memory bank previous power states. | |
1069 | * Returns -EINVAL if the powerdomain pointer is null, or returns 0 upon | |
1070 | * success. | |
1071 | */ | |
1072 | int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) | |
1073 | { | |
1074 | if (!pwrdm) | |
1075 | return -EINVAL; | |
1076 | ||
1077 | /* | |
1078 | * XXX should get the powerdomain's current state here; | |
1079 | * warn & fail if it is not ON. | |
1080 | */ | |
1081 | ||
1082 | pr_debug("powerdomain: clearing previous power state reg for %s\n", | |
1083 | pwrdm->name); | |
1084 | ||
1085 | prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST); | |
1086 | ||
1087 | return 0; | |
1088 | } | |
1089 | ||
0b7cbfb5 PW |
1090 | /** |
1091 | * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm | |
1092 | * @pwrdm: struct powerdomain * | |
1093 | * | |
1094 | * Enable automatic context save-and-restore upon power state change | |
1095 | * for some devices in a powerdomain. Warning: this only affects a | |
1096 | * subset of devices in a powerdomain; check the TRM closely. Returns | |
1097 | * -EINVAL if the powerdomain pointer is null or if the powerdomain | |
1098 | * does not support automatic save-and-restore, or returns 0 upon | |
1099 | * success. | |
1100 | */ | |
1101 | int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) | |
1102 | { | |
1103 | if (!pwrdm) | |
1104 | return -EINVAL; | |
1105 | ||
1106 | if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) | |
1107 | return -EINVAL; | |
1108 | ||
1109 | pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", | |
1110 | pwrdm->name); | |
1111 | ||
1112 | prm_rmw_mod_reg_bits(0, 1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, | |
1113 | pwrdm->prcm_offs, PM_PWSTCTRL); | |
1114 | ||
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | /** | |
1119 | * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm | |
1120 | * @pwrdm: struct powerdomain * | |
1121 | * | |
1122 | * Disable automatic context save-and-restore upon power state change | |
1123 | * for some devices in a powerdomain. Warning: this only affects a | |
1124 | * subset of devices in a powerdomain; check the TRM closely. Returns | |
1125 | * -EINVAL if the powerdomain pointer is null or if the powerdomain | |
1126 | * does not support automatic save-and-restore, or returns 0 upon | |
1127 | * success. | |
1128 | */ | |
1129 | int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) | |
1130 | { | |
1131 | if (!pwrdm) | |
1132 | return -EINVAL; | |
1133 | ||
1134 | if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) | |
1135 | return -EINVAL; | |
1136 | ||
1137 | pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", | |
1138 | pwrdm->name); | |
1139 | ||
1140 | prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, 0, | |
1141 | pwrdm->prcm_offs, PM_PWSTCTRL); | |
1142 | ||
1143 | return 0; | |
1144 | } | |
1145 | ||
1146 | /** | |
1147 | * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR | |
1148 | * @pwrdm: struct powerdomain * | |
1149 | * | |
1150 | * Returns 1 if powerdomain 'pwrdm' supports hardware save-and-restore | |
1151 | * for some devices, or 0 if it does not. | |
1152 | */ | |
1153 | bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm) | |
1154 | { | |
1155 | return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0; | |
1156 | } | |
1157 | ||
ad67ef68 PW |
1158 | /** |
1159 | * pwrdm_wait_transition - wait for powerdomain power transition to finish | |
1160 | * @pwrdm: struct powerdomain * to wait for | |
1161 | * | |
1162 | * If the powerdomain pwrdm is in the process of a state transition, | |
1163 | * spin until it completes the power transition, or until an iteration | |
1164 | * bailout value is reached. Returns -EINVAL if the powerdomain | |
1165 | * pointer is null, -EAGAIN if the bailout value was reached, or | |
1166 | * returns 0 upon success. | |
1167 | */ | |
1168 | int pwrdm_wait_transition(struct powerdomain *pwrdm) | |
1169 | { | |
1170 | u32 c = 0; | |
1171 | ||
1172 | if (!pwrdm) | |
1173 | return -EINVAL; | |
1174 | ||
1175 | /* | |
1176 | * REVISIT: pwrdm_wait_transition() may be better implemented | |
1177 | * via a callback and a periodic timer check -- how long do we expect | |
1178 | * powerdomain transitions to take? | |
1179 | */ | |
1180 | ||
1181 | /* XXX Is this udelay() value meaningful? */ | |
1182 | while ((prm_read_mod_reg(pwrdm->prcm_offs, PM_PWSTST) & | |
1183 | OMAP_INTRANSITION) && | |
1184 | (c++ < PWRDM_TRANSITION_BAILOUT)) | |
1185 | udelay(1); | |
1186 | ||
2687069f | 1187 | if (c > PWRDM_TRANSITION_BAILOUT) { |
ad67ef68 PW |
1188 | printk(KERN_ERR "powerdomain: waited too long for " |
1189 | "powerdomain %s to complete transition\n", pwrdm->name); | |
1190 | return -EAGAIN; | |
1191 | } | |
1192 | ||
1193 | pr_debug("powerdomain: completed transition in %d loops\n", c); | |
1194 | ||
1195 | return 0; | |
1196 | } | |
1197 | ||
ba20bb12 PDS |
1198 | int pwrdm_state_switch(struct powerdomain *pwrdm) |
1199 | { | |
1200 | return _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); | |
1201 | } | |
1202 | ||
1203 | int pwrdm_clkdm_state_switch(struct clockdomain *clkdm) | |
1204 | { | |
1205 | if (clkdm != NULL && clkdm->pwrdm.ptr != NULL) { | |
1206 | pwrdm_wait_transition(clkdm->pwrdm.ptr); | |
1207 | return pwrdm_state_switch(clkdm->pwrdm.ptr); | |
1208 | } | |
1209 | ||
1210 | return -EINVAL; | |
1211 | } | |
1212 | int pwrdm_clk_state_switch(struct clk *clk) | |
1213 | { | |
1214 | if (clk != NULL && clk->clkdm != NULL) | |
1215 | return pwrdm_clkdm_state_switch(clk->clkdm); | |
1216 | return -EINVAL; | |
1217 | } | |
1218 | ||
1219 | int pwrdm_pre_transition(void) | |
1220 | { | |
6199ab26 | 1221 | pwrdm_for_each(_pwrdm_pre_transition_cb, NULL); |
ba20bb12 PDS |
1222 | return 0; |
1223 | } | |
1224 | ||
1225 | int pwrdm_post_transition(void) | |
1226 | { | |
6199ab26 | 1227 | pwrdm_for_each(_pwrdm_post_transition_cb, NULL); |
ba20bb12 PDS |
1228 | return 0; |
1229 | } | |
ad67ef68 | 1230 |