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1 | /* | |
2 | * OMAP powerdomain control | |
3 | * | |
4 | * Copyright (C) 2007-2008, 2011 Texas Instruments, Inc. | |
5 | * Copyright (C) 2007-2011 Nokia Corporation | |
6 | * | |
7 | * Written by Paul Walmsley | |
8 | * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com> | |
9 | * State counting code by Tero Kristo <tero.kristo@nokia.com> | |
10 | * | |
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 | */ | |
15 | #undef DEBUG | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/string.h> | |
22 | #include <trace/events/power.h> | |
23 | ||
24 | #include "cm2xxx_3xxx.h" | |
25 | #include "prcm44xx.h" | |
26 | #include "cm44xx.h" | |
27 | #include "prm2xxx_3xxx.h" | |
28 | #include "prm44xx.h" | |
29 | ||
30 | #include <asm/cpu.h> | |
31 | ||
32 | #include "powerdomain.h" | |
33 | #include "clockdomain.h" | |
34 | ||
35 | #include "soc.h" | |
36 | #include "pm.h" | |
37 | ||
38 | #define PWRDM_TRACE_STATES_FLAG (1<<31) | |
39 | ||
40 | enum { | |
41 | PWRDM_STATE_NOW = 0, | |
42 | PWRDM_STATE_PREV, | |
43 | }; | |
44 | ||
45 | ||
46 | /* pwrdm_list contains all registered struct powerdomains */ | |
47 | static LIST_HEAD(pwrdm_list); | |
48 | ||
49 | static struct pwrdm_ops *arch_pwrdm; | |
50 | ||
51 | /* Private functions */ | |
52 | ||
53 | static struct powerdomain *_pwrdm_lookup(const char *name) | |
54 | { | |
55 | struct powerdomain *pwrdm, *temp_pwrdm; | |
56 | ||
57 | pwrdm = NULL; | |
58 | ||
59 | list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { | |
60 | if (!strcmp(name, temp_pwrdm->name)) { | |
61 | pwrdm = temp_pwrdm; | |
62 | break; | |
63 | } | |
64 | } | |
65 | ||
66 | return pwrdm; | |
67 | } | |
68 | ||
69 | /** | |
70 | * _pwrdm_register - register a powerdomain | |
71 | * @pwrdm: struct powerdomain * to register | |
72 | * | |
73 | * Adds a powerdomain to the internal powerdomain list. Returns | |
74 | * -EINVAL if given a null pointer, -EEXIST if a powerdomain is | |
75 | * already registered by the provided name, or 0 upon success. | |
76 | */ | |
77 | static int _pwrdm_register(struct powerdomain *pwrdm) | |
78 | { | |
79 | int i; | |
80 | struct voltagedomain *voltdm; | |
81 | ||
82 | if (!pwrdm || !pwrdm->name) | |
83 | return -EINVAL; | |
84 | ||
85 | if (cpu_is_omap44xx() && | |
86 | pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) { | |
87 | pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n", | |
88 | pwrdm->name); | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | if (_pwrdm_lookup(pwrdm->name)) | |
93 | return -EEXIST; | |
94 | ||
95 | voltdm = voltdm_lookup(pwrdm->voltdm.name); | |
96 | if (!voltdm) { | |
97 | pr_err("powerdomain: %s: voltagedomain %s does not exist\n", | |
98 | pwrdm->name, pwrdm->voltdm.name); | |
99 | return -EINVAL; | |
100 | } | |
101 | pwrdm->voltdm.ptr = voltdm; | |
102 | INIT_LIST_HEAD(&pwrdm->voltdm_node); | |
103 | voltdm_add_pwrdm(voltdm, pwrdm); | |
104 | ||
105 | list_add(&pwrdm->node, &pwrdm_list); | |
106 | ||
107 | /* Initialize the powerdomain's state counter */ | |
108 | for (i = 0; i < PWRDM_MAX_PWRSTS; i++) | |
109 | pwrdm->state_counter[i] = 0; | |
110 | ||
111 | pwrdm->ret_logic_off_counter = 0; | |
112 | for (i = 0; i < pwrdm->banks; i++) | |
113 | pwrdm->ret_mem_off_counter[i] = 0; | |
114 | ||
115 | pwrdm_wait_transition(pwrdm); | |
116 | pwrdm->state = pwrdm_read_pwrst(pwrdm); | |
117 | pwrdm->state_counter[pwrdm->state] = 1; | |
118 | ||
119 | pr_debug("powerdomain: registered %s\n", pwrdm->name); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | static void _update_logic_membank_counters(struct powerdomain *pwrdm) | |
125 | { | |
126 | int i; | |
127 | u8 prev_logic_pwrst, prev_mem_pwrst; | |
128 | ||
129 | prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm); | |
130 | if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) && | |
131 | (prev_logic_pwrst == PWRDM_POWER_OFF)) | |
132 | pwrdm->ret_logic_off_counter++; | |
133 | ||
134 | for (i = 0; i < pwrdm->banks; i++) { | |
135 | prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i); | |
136 | ||
137 | if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) && | |
138 | (prev_mem_pwrst == PWRDM_POWER_OFF)) | |
139 | pwrdm->ret_mem_off_counter[i]++; | |
140 | } | |
141 | } | |
142 | ||
143 | static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag) | |
144 | { | |
145 | ||
146 | int prev, next, state, trace_state = 0; | |
147 | ||
148 | if (pwrdm == NULL) | |
149 | return -EINVAL; | |
150 | ||
151 | state = pwrdm_read_pwrst(pwrdm); | |
152 | ||
153 | switch (flag) { | |
154 | case PWRDM_STATE_NOW: | |
155 | prev = pwrdm->state; | |
156 | break; | |
157 | case PWRDM_STATE_PREV: | |
158 | prev = pwrdm_read_prev_pwrst(pwrdm); | |
159 | if (pwrdm->state != prev) | |
160 | pwrdm->state_counter[prev]++; | |
161 | if (prev == PWRDM_POWER_RET) | |
162 | _update_logic_membank_counters(pwrdm); | |
163 | /* | |
164 | * If the power domain did not hit the desired state, | |
165 | * generate a trace event with both the desired and hit states | |
166 | */ | |
167 | next = pwrdm_read_next_pwrst(pwrdm); | |
168 | if (next != prev) { | |
169 | trace_state = (PWRDM_TRACE_STATES_FLAG | | |
170 | ((next & OMAP_POWERSTATE_MASK) << 8) | | |
171 | ((prev & OMAP_POWERSTATE_MASK) << 0)); | |
172 | trace_power_domain_target(pwrdm->name, trace_state, | |
173 | smp_processor_id()); | |
174 | } | |
175 | break; | |
176 | default: | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | if (state != prev) | |
181 | pwrdm->state_counter[state]++; | |
182 | ||
183 | pm_dbg_update_time(pwrdm, prev); | |
184 | ||
185 | pwrdm->state = state; | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused) | |
191 | { | |
192 | pwrdm_clear_all_prev_pwrst(pwrdm); | |
193 | _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); | |
194 | return 0; | |
195 | } | |
196 | ||
197 | static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused) | |
198 | { | |
199 | _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | /* Public functions */ | |
204 | ||
205 | /** | |
206 | * pwrdm_register_platform_funcs - register powerdomain implementation fns | |
207 | * @po: func pointers for arch specific implementations | |
208 | * | |
209 | * Register the list of function pointers used to implement the | |
210 | * powerdomain functions on different OMAP SoCs. Should be called | |
211 | * before any other pwrdm_register*() function. Returns -EINVAL if | |
212 | * @po is null, -EEXIST if platform functions have already been | |
213 | * registered, or 0 upon success. | |
214 | */ | |
215 | int pwrdm_register_platform_funcs(struct pwrdm_ops *po) | |
216 | { | |
217 | if (!po) | |
218 | return -EINVAL; | |
219 | ||
220 | if (arch_pwrdm) | |
221 | return -EEXIST; | |
222 | ||
223 | arch_pwrdm = po; | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | /** | |
229 | * pwrdm_register_pwrdms - register SoC powerdomains | |
230 | * @ps: pointer to an array of struct powerdomain to register | |
231 | * | |
232 | * Register the powerdomains available on a particular OMAP SoC. Must | |
233 | * be called after pwrdm_register_platform_funcs(). May be called | |
234 | * multiple times. Returns -EACCES if called before | |
235 | * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is | |
236 | * null; or 0 upon success. | |
237 | */ | |
238 | int pwrdm_register_pwrdms(struct powerdomain **ps) | |
239 | { | |
240 | struct powerdomain **p = NULL; | |
241 | ||
242 | if (!arch_pwrdm) | |
243 | return -EEXIST; | |
244 | ||
245 | if (!ps) | |
246 | return -EINVAL; | |
247 | ||
248 | for (p = ps; *p; p++) | |
249 | _pwrdm_register(*p); | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | /** | |
255 | * pwrdm_complete_init - set up the powerdomain layer | |
256 | * | |
257 | * Do whatever is necessary to initialize registered powerdomains and | |
258 | * powerdomain code. Currently, this programs the next power state | |
259 | * for each powerdomain to ON. This prevents powerdomains from | |
260 | * unexpectedly losing context or entering high wakeup latency modes | |
261 | * with non-power-management-enabled kernels. Must be called after | |
262 | * pwrdm_register_pwrdms(). Returns -EACCES if called before | |
263 | * pwrdm_register_pwrdms(), or 0 upon success. | |
264 | */ | |
265 | int pwrdm_complete_init(void) | |
266 | { | |
267 | struct powerdomain *temp_p; | |
268 | ||
269 | if (list_empty(&pwrdm_list)) | |
270 | return -EACCES; | |
271 | ||
272 | list_for_each_entry(temp_p, &pwrdm_list, node) | |
273 | pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | /** | |
279 | * pwrdm_lookup - look up a powerdomain by name, return a pointer | |
280 | * @name: name of powerdomain | |
281 | * | |
282 | * Find a registered powerdomain by its name @name. Returns a pointer | |
283 | * to the struct powerdomain if found, or NULL otherwise. | |
284 | */ | |
285 | struct powerdomain *pwrdm_lookup(const char *name) | |
286 | { | |
287 | struct powerdomain *pwrdm; | |
288 | ||
289 | if (!name) | |
290 | return NULL; | |
291 | ||
292 | pwrdm = _pwrdm_lookup(name); | |
293 | ||
294 | return pwrdm; | |
295 | } | |
296 | ||
297 | /** | |
298 | * pwrdm_for_each - call function on each registered clockdomain | |
299 | * @fn: callback function * | |
300 | * | |
301 | * Call the supplied function @fn for each registered powerdomain. | |
302 | * The callback function @fn can return anything but 0 to bail out | |
303 | * early from the iterator. Returns the last return value of the | |
304 | * callback function, which should be 0 for success or anything else | |
305 | * to indicate failure; or -EINVAL if the function pointer is null. | |
306 | */ | |
307 | int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user), | |
308 | void *user) | |
309 | { | |
310 | struct powerdomain *temp_pwrdm; | |
311 | int ret = 0; | |
312 | ||
313 | if (!fn) | |
314 | return -EINVAL; | |
315 | ||
316 | list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { | |
317 | ret = (*fn)(temp_pwrdm, user); | |
318 | if (ret) | |
319 | break; | |
320 | } | |
321 | ||
322 | return ret; | |
323 | } | |
324 | ||
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 | int i; | |
338 | int ret = -EINVAL; | |
339 | ||
340 | if (!pwrdm || !clkdm) | |
341 | return -EINVAL; | |
342 | ||
343 | pr_debug("powerdomain: %s: associating clockdomain %s\n", | |
344 | pwrdm->name, clkdm->name); | |
345 | ||
346 | for (i = 0; i < PWRDM_MAX_CLKDMS; i++) { | |
347 | if (!pwrdm->pwrdm_clkdms[i]) | |
348 | break; | |
349 | #ifdef DEBUG | |
350 | if (pwrdm->pwrdm_clkdms[i] == clkdm) { | |
351 | ret = -EINVAL; | |
352 | goto pac_exit; | |
353 | } | |
354 | #endif | |
355 | } | |
356 | ||
357 | if (i == PWRDM_MAX_CLKDMS) { | |
358 | pr_debug("powerdomain: %s: increase PWRDM_MAX_CLKDMS for clkdm %s\n", | |
359 | pwrdm->name, clkdm->name); | |
360 | WARN_ON(1); | |
361 | ret = -ENOMEM; | |
362 | goto pac_exit; | |
363 | } | |
364 | ||
365 | pwrdm->pwrdm_clkdms[i] = clkdm; | |
366 | ||
367 | ret = 0; | |
368 | ||
369 | pac_exit: | |
370 | return ret; | |
371 | } | |
372 | ||
373 | /** | |
374 | * pwrdm_del_clkdm - remove a clockdomain from a powerdomain | |
375 | * @pwrdm: struct powerdomain * to add the clockdomain to | |
376 | * @clkdm: struct clockdomain * to associate with a powerdomain | |
377 | * | |
378 | * Dissociate the clockdomain @clkdm from the powerdomain | |
379 | * @pwrdm. Returns -EINVAL if presented with invalid pointers; -ENOENT | |
380 | * if @clkdm was not associated with the powerdomain, or 0 upon | |
381 | * success. | |
382 | */ | |
383 | int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) | |
384 | { | |
385 | int ret = -EINVAL; | |
386 | int i; | |
387 | ||
388 | if (!pwrdm || !clkdm) | |
389 | return -EINVAL; | |
390 | ||
391 | pr_debug("powerdomain: %s: dissociating clockdomain %s\n", | |
392 | pwrdm->name, clkdm->name); | |
393 | ||
394 | for (i = 0; i < PWRDM_MAX_CLKDMS; i++) | |
395 | if (pwrdm->pwrdm_clkdms[i] == clkdm) | |
396 | break; | |
397 | ||
398 | if (i == PWRDM_MAX_CLKDMS) { | |
399 | pr_debug("powerdomain: %s: clkdm %s not associated?!\n", | |
400 | pwrdm->name, clkdm->name); | |
401 | ret = -ENOENT; | |
402 | goto pdc_exit; | |
403 | } | |
404 | ||
405 | pwrdm->pwrdm_clkdms[i] = NULL; | |
406 | ||
407 | ret = 0; | |
408 | ||
409 | pdc_exit: | |
410 | return ret; | |
411 | } | |
412 | ||
413 | /** | |
414 | * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm | |
415 | * @pwrdm: struct powerdomain * to iterate over | |
416 | * @fn: callback function * | |
417 | * | |
418 | * Call the supplied function @fn for each clockdomain in the powerdomain | |
419 | * @pwrdm. The callback function can return anything but 0 to bail | |
420 | * out early from the iterator. Returns -EINVAL if presented with | |
421 | * invalid pointers; or passes along the last return value of the | |
422 | * callback function, which should be 0 for success or anything else | |
423 | * to indicate failure. | |
424 | */ | |
425 | int pwrdm_for_each_clkdm(struct powerdomain *pwrdm, | |
426 | int (*fn)(struct powerdomain *pwrdm, | |
427 | struct clockdomain *clkdm)) | |
428 | { | |
429 | int ret = 0; | |
430 | int i; | |
431 | ||
432 | if (!fn) | |
433 | return -EINVAL; | |
434 | ||
435 | for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++) | |
436 | ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]); | |
437 | ||
438 | return ret; | |
439 | } | |
440 | ||
441 | /** | |
442 | * pwrdm_get_voltdm - return a ptr to the voltdm that this pwrdm resides in | |
443 | * @pwrdm: struct powerdomain * | |
444 | * | |
445 | * Return a pointer to the struct voltageomain that the specified powerdomain | |
446 | * @pwrdm exists in. | |
447 | */ | |
448 | struct voltagedomain *pwrdm_get_voltdm(struct powerdomain *pwrdm) | |
449 | { | |
450 | return pwrdm->voltdm.ptr; | |
451 | } | |
452 | ||
453 | /** | |
454 | * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain | |
455 | * @pwrdm: struct powerdomain * | |
456 | * | |
457 | * Return the number of controllable memory banks in powerdomain @pwrdm, | |
458 | * starting with 1. Returns -EINVAL if the powerdomain pointer is null. | |
459 | */ | |
460 | int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm) | |
461 | { | |
462 | if (!pwrdm) | |
463 | return -EINVAL; | |
464 | ||
465 | return pwrdm->banks; | |
466 | } | |
467 | ||
468 | /** | |
469 | * pwrdm_set_next_pwrst - set next powerdomain power state | |
470 | * @pwrdm: struct powerdomain * to set | |
471 | * @pwrst: one of the PWRDM_POWER_* macros | |
472 | * | |
473 | * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain | |
474 | * may not enter this state immediately if the preconditions for this state | |
475 | * have not been satisfied. Returns -EINVAL if the powerdomain pointer is | |
476 | * null or if the power state is invalid for the powerdomin, or returns 0 | |
477 | * upon success. | |
478 | */ | |
479 | int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) | |
480 | { | |
481 | int ret = -EINVAL; | |
482 | ||
483 | if (!pwrdm) | |
484 | return -EINVAL; | |
485 | ||
486 | if (!(pwrdm->pwrsts & (1 << pwrst))) | |
487 | return -EINVAL; | |
488 | ||
489 | pr_debug("powerdomain: %s: setting next powerstate to %0x\n", | |
490 | pwrdm->name, pwrst); | |
491 | ||
492 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) { | |
493 | /* Trace the pwrdm desired target state */ | |
494 | trace_power_domain_target(pwrdm->name, pwrst, | |
495 | smp_processor_id()); | |
496 | /* Program the pwrdm desired target state */ | |
497 | ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst); | |
498 | } | |
499 | ||
500 | return ret; | |
501 | } | |
502 | ||
503 | /** | |
504 | * pwrdm_read_next_pwrst - get next powerdomain power state | |
505 | * @pwrdm: struct powerdomain * to get power state | |
506 | * | |
507 | * Return the powerdomain @pwrdm's next power state. Returns -EINVAL | |
508 | * if the powerdomain pointer is null or returns the next power state | |
509 | * upon success. | |
510 | */ | |
511 | int pwrdm_read_next_pwrst(struct powerdomain *pwrdm) | |
512 | { | |
513 | int ret = -EINVAL; | |
514 | ||
515 | if (!pwrdm) | |
516 | return -EINVAL; | |
517 | ||
518 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst) | |
519 | ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm); | |
520 | ||
521 | return ret; | |
522 | } | |
523 | ||
524 | /** | |
525 | * pwrdm_read_pwrst - get current powerdomain power state | |
526 | * @pwrdm: struct powerdomain * to get power state | |
527 | * | |
528 | * Return the powerdomain @pwrdm's current power state. Returns -EINVAL | |
529 | * if the powerdomain pointer is null or returns the current power state | |
530 | * upon success. Note that if the power domain only supports the ON state | |
531 | * then just return ON as the current state. | |
532 | */ | |
533 | int pwrdm_read_pwrst(struct powerdomain *pwrdm) | |
534 | { | |
535 | int ret = -EINVAL; | |
536 | ||
537 | if (!pwrdm) | |
538 | return -EINVAL; | |
539 | ||
540 | if (pwrdm->pwrsts == PWRSTS_ON) | |
541 | return PWRDM_POWER_ON; | |
542 | ||
543 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst) | |
544 | ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm); | |
545 | ||
546 | return ret; | |
547 | } | |
548 | ||
549 | /** | |
550 | * pwrdm_read_prev_pwrst - get previous powerdomain power state | |
551 | * @pwrdm: struct powerdomain * to get previous power state | |
552 | * | |
553 | * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL | |
554 | * if the powerdomain pointer is null or returns the previous power state | |
555 | * upon success. | |
556 | */ | |
557 | int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) | |
558 | { | |
559 | int ret = -EINVAL; | |
560 | ||
561 | if (!pwrdm) | |
562 | return -EINVAL; | |
563 | ||
564 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst) | |
565 | ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm); | |
566 | ||
567 | return ret; | |
568 | } | |
569 | ||
570 | /** | |
571 | * pwrdm_set_logic_retst - set powerdomain logic power state upon retention | |
572 | * @pwrdm: struct powerdomain * to set | |
573 | * @pwrst: one of the PWRDM_POWER_* macros | |
574 | * | |
575 | * Set the next power state @pwrst that the logic portion of the | |
576 | * powerdomain @pwrdm will enter when the powerdomain enters retention. | |
577 | * This will be either RETENTION or OFF, if supported. Returns | |
578 | * -EINVAL if the powerdomain pointer is null or the target power | |
579 | * state is not not supported, or returns 0 upon success. | |
580 | */ | |
581 | int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) | |
582 | { | |
583 | int ret = -EINVAL; | |
584 | ||
585 | if (!pwrdm) | |
586 | return -EINVAL; | |
587 | ||
588 | if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst))) | |
589 | return -EINVAL; | |
590 | ||
591 | pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n", | |
592 | pwrdm->name, pwrst); | |
593 | ||
594 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst) | |
595 | ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst); | |
596 | ||
597 | return ret; | |
598 | } | |
599 | ||
600 | /** | |
601 | * pwrdm_set_mem_onst - set memory power state while powerdomain ON | |
602 | * @pwrdm: struct powerdomain * to set | |
603 | * @bank: memory bank number to set (0-3) | |
604 | * @pwrst: one of the PWRDM_POWER_* macros | |
605 | * | |
606 | * Set the next power state @pwrst that memory bank @bank of the | |
607 | * powerdomain @pwrdm will enter when the powerdomain enters the ON | |
608 | * state. @bank will be a number from 0 to 3, and represents different | |
609 | * types of memory, depending on the powerdomain. Returns -EINVAL if | |
610 | * the powerdomain pointer is null or the target power state is not | |
611 | * not supported for this memory bank, -EEXIST if the target memory | |
612 | * bank does not exist or is not controllable, or returns 0 upon | |
613 | * success. | |
614 | */ | |
615 | int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) | |
616 | { | |
617 | int ret = -EINVAL; | |
618 | ||
619 | if (!pwrdm) | |
620 | return -EINVAL; | |
621 | ||
622 | if (pwrdm->banks < (bank + 1)) | |
623 | return -EEXIST; | |
624 | ||
625 | if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst))) | |
626 | return -EINVAL; | |
627 | ||
628 | pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n", | |
629 | pwrdm->name, bank, pwrst); | |
630 | ||
631 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst) | |
632 | ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst); | |
633 | ||
634 | return ret; | |
635 | } | |
636 | ||
637 | /** | |
638 | * pwrdm_set_mem_retst - set memory power state while powerdomain in RET | |
639 | * @pwrdm: struct powerdomain * to set | |
640 | * @bank: memory bank number to set (0-3) | |
641 | * @pwrst: one of the PWRDM_POWER_* macros | |
642 | * | |
643 | * Set the next power state @pwrst that memory bank @bank of the | |
644 | * powerdomain @pwrdm will enter when the powerdomain enters the | |
645 | * RETENTION state. Bank will be a number from 0 to 3, and represents | |
646 | * different types of memory, depending on the powerdomain. @pwrst | |
647 | * will be either RETENTION or OFF, if supported. Returns -EINVAL if | |
648 | * the powerdomain pointer is null or the target power state is not | |
649 | * not supported for this memory bank, -EEXIST if the target memory | |
650 | * bank does not exist or is not controllable, or returns 0 upon | |
651 | * success. | |
652 | */ | |
653 | int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) | |
654 | { | |
655 | int ret = -EINVAL; | |
656 | ||
657 | if (!pwrdm) | |
658 | return -EINVAL; | |
659 | ||
660 | if (pwrdm->banks < (bank + 1)) | |
661 | return -EEXIST; | |
662 | ||
663 | if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst))) | |
664 | return -EINVAL; | |
665 | ||
666 | pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n", | |
667 | pwrdm->name, bank, pwrst); | |
668 | ||
669 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst) | |
670 | ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst); | |
671 | ||
672 | return ret; | |
673 | } | |
674 | ||
675 | /** | |
676 | * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state | |
677 | * @pwrdm: struct powerdomain * to get current logic retention power state | |
678 | * | |
679 | * Return the power state that the logic portion of powerdomain @pwrdm | |
680 | * will enter when the powerdomain enters retention. Returns -EINVAL | |
681 | * if the powerdomain pointer is null or returns the logic retention | |
682 | * power state upon success. | |
683 | */ | |
684 | int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) | |
685 | { | |
686 | int ret = -EINVAL; | |
687 | ||
688 | if (!pwrdm) | |
689 | return -EINVAL; | |
690 | ||
691 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst) | |
692 | ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm); | |
693 | ||
694 | return ret; | |
695 | } | |
696 | ||
697 | /** | |
698 | * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state | |
699 | * @pwrdm: struct powerdomain * to get previous logic power state | |
700 | * | |
701 | * Return the powerdomain @pwrdm's previous logic power state. Returns | |
702 | * -EINVAL if the powerdomain pointer is null or returns the previous | |
703 | * logic power state upon success. | |
704 | */ | |
705 | int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) | |
706 | { | |
707 | int ret = -EINVAL; | |
708 | ||
709 | if (!pwrdm) | |
710 | return -EINVAL; | |
711 | ||
712 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst) | |
713 | ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm); | |
714 | ||
715 | return ret; | |
716 | } | |
717 | ||
718 | /** | |
719 | * pwrdm_read_logic_retst - get next powerdomain logic power state | |
720 | * @pwrdm: struct powerdomain * to get next logic power state | |
721 | * | |
722 | * Return the powerdomain pwrdm's logic power state. Returns -EINVAL | |
723 | * if the powerdomain pointer is null or returns the next logic | |
724 | * power state upon success. | |
725 | */ | |
726 | int pwrdm_read_logic_retst(struct powerdomain *pwrdm) | |
727 | { | |
728 | int ret = -EINVAL; | |
729 | ||
730 | if (!pwrdm) | |
731 | return -EINVAL; | |
732 | ||
733 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst) | |
734 | ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm); | |
735 | ||
736 | return ret; | |
737 | } | |
738 | ||
739 | /** | |
740 | * pwrdm_read_mem_pwrst - get current memory bank power state | |
741 | * @pwrdm: struct powerdomain * to get current memory bank power state | |
742 | * @bank: memory bank number (0-3) | |
743 | * | |
744 | * Return the powerdomain @pwrdm's current memory power state for bank | |
745 | * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if | |
746 | * the target memory bank does not exist or is not controllable, or | |
747 | * returns the current memory power state upon success. | |
748 | */ | |
749 | int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) | |
750 | { | |
751 | int ret = -EINVAL; | |
752 | ||
753 | if (!pwrdm) | |
754 | return ret; | |
755 | ||
756 | if (pwrdm->banks < (bank + 1)) | |
757 | return ret; | |
758 | ||
759 | if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) | |
760 | bank = 1; | |
761 | ||
762 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst) | |
763 | ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank); | |
764 | ||
765 | return ret; | |
766 | } | |
767 | ||
768 | /** | |
769 | * pwrdm_read_prev_mem_pwrst - get previous memory bank power state | |
770 | * @pwrdm: struct powerdomain * to get previous memory bank power state | |
771 | * @bank: memory bank number (0-3) | |
772 | * | |
773 | * Return the powerdomain @pwrdm's previous memory power state for | |
774 | * bank @bank. Returns -EINVAL if the powerdomain pointer is null, | |
775 | * -EEXIST if the target memory bank does not exist or is not | |
776 | * controllable, or returns the previous memory power state upon | |
777 | * success. | |
778 | */ | |
779 | int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) | |
780 | { | |
781 | int ret = -EINVAL; | |
782 | ||
783 | if (!pwrdm) | |
784 | return ret; | |
785 | ||
786 | if (pwrdm->banks < (bank + 1)) | |
787 | return ret; | |
788 | ||
789 | if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) | |
790 | bank = 1; | |
791 | ||
792 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst) | |
793 | ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank); | |
794 | ||
795 | return ret; | |
796 | } | |
797 | ||
798 | /** | |
799 | * pwrdm_read_mem_retst - get next memory bank power state | |
800 | * @pwrdm: struct powerdomain * to get mext memory bank power state | |
801 | * @bank: memory bank number (0-3) | |
802 | * | |
803 | * Return the powerdomain pwrdm's next memory power state for bank | |
804 | * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if | |
805 | * the target memory bank does not exist or is not controllable, or | |
806 | * returns the next memory power state upon success. | |
807 | */ | |
808 | int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) | |
809 | { | |
810 | int ret = -EINVAL; | |
811 | ||
812 | if (!pwrdm) | |
813 | return ret; | |
814 | ||
815 | if (pwrdm->banks < (bank + 1)) | |
816 | return ret; | |
817 | ||
818 | if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst) | |
819 | ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank); | |
820 | ||
821 | return ret; | |
822 | } | |
823 | ||
824 | /** | |
825 | * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm | |
826 | * @pwrdm: struct powerdomain * to clear | |
827 | * | |
828 | * Clear the powerdomain's previous power state register @pwrdm. | |
829 | * Clears the entire register, including logic and memory bank | |
830 | * previous power states. Returns -EINVAL if the powerdomain pointer | |
831 | * is null, or returns 0 upon success. | |
832 | */ | |
833 | int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) | |
834 | { | |
835 | int ret = -EINVAL; | |
836 | ||
837 | if (!pwrdm) | |
838 | return ret; | |
839 | ||
840 | /* | |
841 | * XXX should get the powerdomain's current state here; | |
842 | * warn & fail if it is not ON. | |
843 | */ | |
844 | ||
845 | pr_debug("powerdomain: %s: clearing previous power state reg\n", | |
846 | pwrdm->name); | |
847 | ||
848 | if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst) | |
849 | ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm); | |
850 | ||
851 | return ret; | |
852 | } | |
853 | ||
854 | /** | |
855 | * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm | |
856 | * @pwrdm: struct powerdomain * | |
857 | * | |
858 | * Enable automatic context save-and-restore upon power state change | |
859 | * for some devices in the powerdomain @pwrdm. Warning: this only | |
860 | * affects a subset of devices in a powerdomain; check the TRM | |
861 | * closely. Returns -EINVAL if the powerdomain pointer is null or if | |
862 | * the powerdomain does not support automatic save-and-restore, or | |
863 | * returns 0 upon success. | |
864 | */ | |
865 | int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) | |
866 | { | |
867 | int ret = -EINVAL; | |
868 | ||
869 | if (!pwrdm) | |
870 | return ret; | |
871 | ||
872 | if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) | |
873 | return ret; | |
874 | ||
875 | pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm->name); | |
876 | ||
877 | if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar) | |
878 | ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm); | |
879 | ||
880 | return ret; | |
881 | } | |
882 | ||
883 | /** | |
884 | * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm | |
885 | * @pwrdm: struct powerdomain * | |
886 | * | |
887 | * Disable automatic context save-and-restore upon power state change | |
888 | * for some devices in the powerdomain @pwrdm. Warning: this only | |
889 | * affects a subset of devices in a powerdomain; check the TRM | |
890 | * closely. Returns -EINVAL if the powerdomain pointer is null or if | |
891 | * the powerdomain does not support automatic save-and-restore, or | |
892 | * returns 0 upon success. | |
893 | */ | |
894 | int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) | |
895 | { | |
896 | int ret = -EINVAL; | |
897 | ||
898 | if (!pwrdm) | |
899 | return ret; | |
900 | ||
901 | if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) | |
902 | return ret; | |
903 | ||
904 | pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm->name); | |
905 | ||
906 | if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar) | |
907 | ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm); | |
908 | ||
909 | return ret; | |
910 | } | |
911 | ||
912 | /** | |
913 | * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR | |
914 | * @pwrdm: struct powerdomain * | |
915 | * | |
916 | * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore | |
917 | * for some devices, or 0 if it does not. | |
918 | */ | |
919 | bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm) | |
920 | { | |
921 | return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0; | |
922 | } | |
923 | ||
924 | /** | |
925 | * pwrdm_set_lowpwrstchange - Request a low power state change | |
926 | * @pwrdm: struct powerdomain * | |
927 | * | |
928 | * Allows a powerdomain to transtion to a lower power sleep state | |
929 | * from an existing sleep state without waking up the powerdomain. | |
930 | * Returns -EINVAL if the powerdomain pointer is null or if the | |
931 | * powerdomain does not support LOWPOWERSTATECHANGE, or returns 0 | |
932 | * upon success. | |
933 | */ | |
934 | int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm) | |
935 | { | |
936 | int ret = -EINVAL; | |
937 | ||
938 | if (!pwrdm) | |
939 | return -EINVAL; | |
940 | ||
941 | if (!(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) | |
942 | return -EINVAL; | |
943 | ||
944 | pr_debug("powerdomain: %s: setting LOWPOWERSTATECHANGE bit\n", | |
945 | pwrdm->name); | |
946 | ||
947 | if (arch_pwrdm && arch_pwrdm->pwrdm_set_lowpwrstchange) | |
948 | ret = arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm); | |
949 | ||
950 | return ret; | |
951 | } | |
952 | ||
953 | /** | |
954 | * pwrdm_wait_transition - wait for powerdomain power transition to finish | |
955 | * @pwrdm: struct powerdomain * to wait for | |
956 | * | |
957 | * If the powerdomain @pwrdm is in the process of a state transition, | |
958 | * spin until it completes the power transition, or until an iteration | |
959 | * bailout value is reached. Returns -EINVAL if the powerdomain | |
960 | * pointer is null, -EAGAIN if the bailout value was reached, or | |
961 | * returns 0 upon success. | |
962 | */ | |
963 | int pwrdm_wait_transition(struct powerdomain *pwrdm) | |
964 | { | |
965 | int ret = -EINVAL; | |
966 | ||
967 | if (!pwrdm) | |
968 | return -EINVAL; | |
969 | ||
970 | if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition) | |
971 | ret = arch_pwrdm->pwrdm_wait_transition(pwrdm); | |
972 | ||
973 | return ret; | |
974 | } | |
975 | ||
976 | int pwrdm_state_switch(struct powerdomain *pwrdm) | |
977 | { | |
978 | int ret; | |
979 | ||
980 | ret = pwrdm_wait_transition(pwrdm); | |
981 | if (!ret) | |
982 | ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); | |
983 | ||
984 | return ret; | |
985 | } | |
986 | ||
987 | int pwrdm_pre_transition(struct powerdomain *pwrdm) | |
988 | { | |
989 | if (pwrdm) | |
990 | _pwrdm_pre_transition_cb(pwrdm, NULL); | |
991 | else | |
992 | pwrdm_for_each(_pwrdm_pre_transition_cb, NULL); | |
993 | ||
994 | return 0; | |
995 | } | |
996 | ||
997 | int pwrdm_post_transition(struct powerdomain *pwrdm) | |
998 | { | |
999 | if (pwrdm) | |
1000 | _pwrdm_post_transition_cb(pwrdm, NULL); | |
1001 | else | |
1002 | pwrdm_for_each(_pwrdm_post_transition_cb, NULL); | |
1003 | ||
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * pwrdm_get_context_loss_count - get powerdomain's context loss count | |
1009 | * @pwrdm: struct powerdomain * to wait for | |
1010 | * | |
1011 | * Context loss count is the sum of powerdomain off-mode counter, the | |
1012 | * logic off counter and the per-bank memory off counter. Returns negative | |
1013 | * (and WARNs) upon error, otherwise, returns the context loss count. | |
1014 | */ | |
1015 | int pwrdm_get_context_loss_count(struct powerdomain *pwrdm) | |
1016 | { | |
1017 | int i, count; | |
1018 | ||
1019 | if (!pwrdm) { | |
1020 | WARN(1, "powerdomain: %s: pwrdm is null\n", __func__); | |
1021 | return -ENODEV; | |
1022 | } | |
1023 | ||
1024 | count = pwrdm->state_counter[PWRDM_POWER_OFF]; | |
1025 | count += pwrdm->ret_logic_off_counter; | |
1026 | ||
1027 | for (i = 0; i < pwrdm->banks; i++) | |
1028 | count += pwrdm->ret_mem_off_counter[i]; | |
1029 | ||
1030 | /* | |
1031 | * Context loss count has to be a non-negative value. Clear the sign | |
1032 | * bit to get a value range from 0 to INT_MAX. | |
1033 | */ | |
1034 | count &= INT_MAX; | |
1035 | ||
1036 | pr_debug("powerdomain: %s: context loss count = %d\n", | |
1037 | pwrdm->name, count); | |
1038 | ||
1039 | return count; | |
1040 | } | |
1041 | ||
1042 | /** | |
1043 | * pwrdm_can_ever_lose_context - can this powerdomain ever lose context? | |
1044 | * @pwrdm: struct powerdomain * | |
1045 | * | |
1046 | * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain | |
1047 | * can lose either memory or logic context or if @pwrdm is invalid, or | |
1048 | * returns 0 otherwise. This function is not concerned with how the | |
1049 | * powerdomain registers are programmed (i.e., to go off or not); it's | |
1050 | * concerned with whether it's ever possible for this powerdomain to | |
1051 | * go off while some other part of the chip is active. This function | |
1052 | * assumes that every powerdomain can go to either ON or INACTIVE. | |
1053 | */ | |
1054 | bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm) | |
1055 | { | |
1056 | int i; | |
1057 | ||
1058 | if (IS_ERR_OR_NULL(pwrdm)) { | |
1059 | pr_debug("powerdomain: %s: invalid powerdomain pointer\n", | |
1060 | __func__); | |
1061 | return 1; | |
1062 | } | |
1063 | ||
1064 | if (pwrdm->pwrsts & PWRSTS_OFF) | |
1065 | return 1; | |
1066 | ||
1067 | if (pwrdm->pwrsts & PWRSTS_RET) { | |
1068 | if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF) | |
1069 | return 1; | |
1070 | ||
1071 | for (i = 0; i < pwrdm->banks; i++) | |
1072 | if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF) | |
1073 | return 1; | |
1074 | } | |
1075 | ||
1076 | for (i = 0; i < pwrdm->banks; i++) | |
1077 | if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF) | |
1078 | return 1; | |
1079 | ||
1080 | return 0; | |
1081 | } |