Commit | Line | Data |
---|---|---|
d459bfe0 | 1 | /* |
8a3ddc75 | 2 | * OMAP2/3/4 clockdomain framework functions |
d459bfe0 | 3 | * |
32a363c0 PW |
4 | * Copyright (C) 2008-2011 Texas Instruments, Inc. |
5 | * Copyright (C) 2008-2011 Nokia Corporation | |
d459bfe0 PW |
6 | * |
7 | * Written by Paul Walmsley and Jouni Högander | |
8a3ddc75 | 8 | * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com> |
d459bfe0 PW |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
33903eb5 | 14 | #undef DEBUG |
d459bfe0 | 15 | |
d459bfe0 PW |
16 | #include <linux/kernel.h> |
17 | #include <linux/device.h> | |
18 | #include <linux/list.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/clk.h> | |
22 | #include <linux/limits.h> | |
5b74c676 | 23 | #include <linux/err.h> |
d459bfe0 PW |
24 | |
25 | #include <linux/io.h> | |
26 | ||
27 | #include <linux/bitops.h> | |
28 | ||
55ed9694 | 29 | #include <plat/clock.h> |
1540f214 | 30 | #include "clockdomain.h" |
d459bfe0 PW |
31 | |
32 | /* clkdm_list contains all registered struct clockdomains */ | |
33 | static LIST_HEAD(clkdm_list); | |
34 | ||
55ed9694 PW |
35 | /* array of clockdomain deps to be added/removed when clkdm in hwsup mode */ |
36 | static struct clkdm_autodep *autodeps; | |
d459bfe0 | 37 | |
32d4034e | 38 | static struct clkdm_ops *arch_clkdm; |
d459bfe0 PW |
39 | |
40 | /* Private functions */ | |
41 | ||
55ed9694 PW |
42 | static struct clockdomain *_clkdm_lookup(const char *name) |
43 | { | |
44 | struct clockdomain *clkdm, *temp_clkdm; | |
45 | ||
46 | if (!name) | |
47 | return NULL; | |
48 | ||
49 | clkdm = NULL; | |
50 | ||
51 | list_for_each_entry(temp_clkdm, &clkdm_list, node) { | |
52 | if (!strcmp(name, temp_clkdm->name)) { | |
53 | clkdm = temp_clkdm; | |
54 | break; | |
55 | } | |
56 | } | |
57 | ||
58 | return clkdm; | |
59 | } | |
60 | ||
e909d62a PW |
61 | /** |
62 | * _clkdm_register - register a clockdomain | |
63 | * @clkdm: struct clockdomain * to register | |
64 | * | |
65 | * Adds a clockdomain to the internal clockdomain list. | |
66 | * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is | |
67 | * already registered by the provided name, or 0 upon success. | |
68 | */ | |
69 | static int _clkdm_register(struct clockdomain *clkdm) | |
70 | { | |
71 | struct powerdomain *pwrdm; | |
72 | ||
73 | if (!clkdm || !clkdm->name) | |
74 | return -EINVAL; | |
75 | ||
76 | if (!omap_chip_is(clkdm->omap_chip)) | |
77 | return -EINVAL; | |
78 | ||
79 | pwrdm = pwrdm_lookup(clkdm->pwrdm.name); | |
80 | if (!pwrdm) { | |
81 | pr_err("clockdomain: %s: powerdomain %s does not exist\n", | |
82 | clkdm->name, clkdm->pwrdm.name); | |
83 | return -EINVAL; | |
84 | } | |
85 | clkdm->pwrdm.ptr = pwrdm; | |
86 | ||
87 | /* Verify that the clockdomain is not already registered */ | |
88 | if (_clkdm_lookup(clkdm->name)) | |
89 | return -EEXIST; | |
90 | ||
91 | list_add(&clkdm->node, &clkdm_list); | |
92 | ||
93 | pwrdm_add_clkdm(pwrdm, clkdm); | |
94 | ||
555e74ea RN |
95 | spin_lock_init(&clkdm->lock); |
96 | ||
e909d62a PW |
97 | pr_debug("clockdomain: registered %s\n", clkdm->name); |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
55ed9694 PW |
102 | /* _clkdm_deps_lookup - look up the specified clockdomain in a clkdm list */ |
103 | static struct clkdm_dep *_clkdm_deps_lookup(struct clockdomain *clkdm, | |
104 | struct clkdm_dep *deps) | |
105 | { | |
106 | struct clkdm_dep *cd; | |
107 | ||
108 | if (!clkdm || !deps || !omap_chip_is(clkdm->omap_chip)) | |
109 | return ERR_PTR(-EINVAL); | |
110 | ||
111 | for (cd = deps; cd->clkdm_name; cd++) { | |
55ed9694 PW |
112 | if (!omap_chip_is(cd->omap_chip)) |
113 | continue; | |
114 | ||
115 | if (!cd->clkdm && cd->clkdm_name) | |
116 | cd->clkdm = _clkdm_lookup(cd->clkdm_name); | |
117 | ||
118 | if (cd->clkdm == clkdm) | |
119 | break; | |
55ed9694 PW |
120 | } |
121 | ||
122 | if (!cd->clkdm_name) | |
123 | return ERR_PTR(-ENOENT); | |
124 | ||
125 | return cd; | |
126 | } | |
127 | ||
d459bfe0 | 128 | /* |
55ed9694 PW |
129 | * _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store |
130 | * @autodep: struct clkdm_autodep * to resolve | |
d459bfe0 | 131 | * |
55ed9694 PW |
132 | * Resolve autodep clockdomain names to clockdomain pointers via |
133 | * clkdm_lookup() and store the pointers in the autodep structure. An | |
134 | * "autodep" is a clockdomain sleep/wakeup dependency that is | |
d459bfe0 PW |
135 | * automatically added and removed whenever clocks in the associated |
136 | * clockdomain are enabled or disabled (respectively) when the | |
137 | * clockdomain is in hardware-supervised mode. Meant to be called | |
138 | * once at clockdomain layer initialization, since these should remain | |
139 | * fixed for a particular architecture. No return value. | |
b170fbe1 PW |
140 | * |
141 | * XXX autodeps are deprecated and should be removed at the earliest | |
142 | * opportunity | |
d459bfe0 | 143 | */ |
55ed9694 | 144 | static void _autodep_lookup(struct clkdm_autodep *autodep) |
d459bfe0 | 145 | { |
55ed9694 | 146 | struct clockdomain *clkdm; |
d459bfe0 PW |
147 | |
148 | if (!autodep) | |
149 | return; | |
150 | ||
151 | if (!omap_chip_is(autodep->omap_chip)) | |
152 | return; | |
153 | ||
55ed9694 PW |
154 | clkdm = clkdm_lookup(autodep->clkdm.name); |
155 | if (!clkdm) { | |
156 | pr_err("clockdomain: autodeps: clockdomain %s does not exist\n", | |
157 | autodep->clkdm.name); | |
158 | clkdm = ERR_PTR(-ENOENT); | |
d459bfe0 | 159 | } |
55ed9694 | 160 | autodep->clkdm.ptr = clkdm; |
d459bfe0 PW |
161 | } |
162 | ||
163 | /* | |
164 | * _clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable | |
165 | * @clkdm: struct clockdomain * | |
166 | * | |
167 | * Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm' | |
168 | * in hardware-supervised mode. Meant to be called from clock framework | |
169 | * when a clock inside clockdomain 'clkdm' is enabled. No return value. | |
b170fbe1 PW |
170 | * |
171 | * XXX autodeps are deprecated and should be removed at the earliest | |
172 | * opportunity | |
d459bfe0 | 173 | */ |
5cd1937b | 174 | void _clkdm_add_autodeps(struct clockdomain *clkdm) |
d459bfe0 | 175 | { |
55ed9694 | 176 | struct clkdm_autodep *autodep; |
d459bfe0 | 177 | |
570b54c7 | 178 | if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS) |
ad956160 PW |
179 | return; |
180 | ||
55ed9694 PW |
181 | for (autodep = autodeps; autodep->clkdm.ptr; autodep++) { |
182 | if (IS_ERR(autodep->clkdm.ptr)) | |
d459bfe0 PW |
183 | continue; |
184 | ||
d96df00d PW |
185 | if (!omap_chip_is(autodep->omap_chip)) |
186 | continue; | |
187 | ||
d459bfe0 | 188 | pr_debug("clockdomain: adding %s sleepdep/wkdep for " |
55ed9694 PW |
189 | "clkdm %s\n", autodep->clkdm.ptr->name, |
190 | clkdm->name); | |
d459bfe0 | 191 | |
55ed9694 PW |
192 | clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr); |
193 | clkdm_add_wkdep(clkdm, autodep->clkdm.ptr); | |
d459bfe0 PW |
194 | } |
195 | } | |
196 | ||
197 | /* | |
198 | * _clkdm_add_autodeps - remove auto sleepdeps/wkdeps from clkdm | |
199 | * @clkdm: struct clockdomain * | |
200 | * | |
201 | * Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm' | |
202 | * in hardware-supervised mode. Meant to be called from clock framework | |
203 | * when a clock inside clockdomain 'clkdm' is disabled. No return value. | |
b170fbe1 PW |
204 | * |
205 | * XXX autodeps are deprecated and should be removed at the earliest | |
206 | * opportunity | |
d459bfe0 | 207 | */ |
5cd1937b | 208 | void _clkdm_del_autodeps(struct clockdomain *clkdm) |
d459bfe0 | 209 | { |
55ed9694 | 210 | struct clkdm_autodep *autodep; |
d459bfe0 | 211 | |
570b54c7 | 212 | if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS) |
ad956160 PW |
213 | return; |
214 | ||
55ed9694 PW |
215 | for (autodep = autodeps; autodep->clkdm.ptr; autodep++) { |
216 | if (IS_ERR(autodep->clkdm.ptr)) | |
d459bfe0 PW |
217 | continue; |
218 | ||
d96df00d PW |
219 | if (!omap_chip_is(autodep->omap_chip)) |
220 | continue; | |
221 | ||
d459bfe0 | 222 | pr_debug("clockdomain: removing %s sleepdep/wkdep for " |
55ed9694 PW |
223 | "clkdm %s\n", autodep->clkdm.ptr->name, |
224 | clkdm->name); | |
d459bfe0 | 225 | |
55ed9694 PW |
226 | clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr); |
227 | clkdm_del_wkdep(clkdm, autodep->clkdm.ptr); | |
d459bfe0 PW |
228 | } |
229 | } | |
230 | ||
b170fbe1 | 231 | /** |
4aef7a2a RN |
232 | * _resolve_clkdm_deps() - resolve clkdm_names in @clkdm_deps to clkdms |
233 | * @clkdm: clockdomain that we are resolving dependencies for | |
234 | * @clkdm_deps: ptr to array of struct clkdm_deps to resolve | |
b170fbe1 | 235 | * |
4aef7a2a RN |
236 | * Iterates through @clkdm_deps, looking up the struct clockdomain named by |
237 | * clkdm_name and storing the clockdomain pointer in the struct clkdm_dep. | |
b170fbe1 | 238 | * No return value. |
a0219fbd | 239 | */ |
4aef7a2a RN |
240 | static void _resolve_clkdm_deps(struct clockdomain *clkdm, |
241 | struct clkdm_dep *clkdm_deps) | |
a0219fbd | 242 | { |
4aef7a2a RN |
243 | struct clkdm_dep *cd; |
244 | ||
245 | for (cd = clkdm_deps; cd && cd->clkdm_name; cd++) { | |
246 | if (!omap_chip_is(cd->omap_chip)) | |
247 | continue; | |
248 | if (cd->clkdm) | |
249 | continue; | |
250 | cd->clkdm = _clkdm_lookup(cd->clkdm_name); | |
251 | ||
252 | WARN(!cd->clkdm, "clockdomain: %s: could not find clkdm %s while resolving dependencies - should never happen", | |
253 | clkdm->name, cd->clkdm_name); | |
254 | } | |
a0219fbd | 255 | } |
d459bfe0 | 256 | |
d459bfe0 PW |
257 | /* Public functions */ |
258 | ||
259 | /** | |
08cb9703 PW |
260 | * clkdm_register_platform_funcs - register clockdomain implementation fns |
261 | * @co: func pointers for arch specific implementations | |
d459bfe0 | 262 | * |
08cb9703 PW |
263 | * Register the list of function pointers used to implement the |
264 | * clockdomain functions on different OMAP SoCs. Should be called | |
265 | * before any other clkdm_register*() function. Returns -EINVAL if | |
266 | * @co is null, -EEXIST if platform functions have already been | |
267 | * registered, or 0 upon success. | |
d459bfe0 | 268 | */ |
08cb9703 PW |
269 | int clkdm_register_platform_funcs(struct clkdm_ops *co) |
270 | { | |
271 | if (!co) | |
272 | return -EINVAL; | |
273 | ||
274 | if (arch_clkdm) | |
275 | return -EEXIST; | |
276 | ||
277 | arch_clkdm = co; | |
278 | ||
279 | return 0; | |
280 | }; | |
281 | ||
282 | /** | |
283 | * clkdm_register_clkdms - register SoC clockdomains | |
284 | * @cs: pointer to an array of struct clockdomain to register | |
285 | * | |
286 | * Register the clockdomains available on a particular OMAP SoC. Must | |
287 | * be called after clkdm_register_platform_funcs(). May be called | |
288 | * multiple times. Returns -EACCES if called before | |
289 | * clkdm_register_platform_funcs(); -EINVAL if the argument @cs is | |
290 | * null; or 0 upon success. | |
291 | */ | |
292 | int clkdm_register_clkdms(struct clockdomain **cs) | |
d459bfe0 PW |
293 | { |
294 | struct clockdomain **c = NULL; | |
d459bfe0 | 295 | |
08cb9703 PW |
296 | if (!arch_clkdm) |
297 | return -EACCES; | |
298 | ||
299 | if (!cs) | |
300 | return -EINVAL; | |
301 | ||
302 | for (c = cs; *c; c++) | |
303 | _clkdm_register(*c); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | /** | |
309 | * clkdm_register_autodeps - register autodeps (if required) | |
310 | * @ia: pointer to a static array of struct clkdm_autodep to register | |
311 | * | |
312 | * Register clockdomain "automatic dependencies." These are | |
313 | * clockdomain wakeup and sleep dependencies that are automatically | |
314 | * added whenever the first clock inside a clockdomain is enabled, and | |
315 | * removed whenever the last clock inside a clockdomain is disabled. | |
316 | * These are currently only used on OMAP3 devices, and are deprecated, | |
317 | * since they waste energy. However, until the OMAP2/3 IP block | |
318 | * enable/disable sequence can be converted to match the OMAP4 | |
319 | * sequence, they are needed. | |
320 | * | |
321 | * Must be called only after all of the SoC clockdomains are | |
322 | * registered, since the function will resolve autodep clockdomain | |
323 | * names into clockdomain pointers. | |
324 | * | |
325 | * The struct clkdm_autodep @ia array must be static, as this function | |
326 | * does not copy the array elements. | |
327 | * | |
328 | * Returns -EACCES if called before any clockdomains have been | |
329 | * registered, -EINVAL if called with a null @ia argument, -EEXIST if | |
330 | * autodeps have already been registered, or 0 upon success. | |
331 | */ | |
332 | int clkdm_register_autodeps(struct clkdm_autodep *ia) | |
333 | { | |
334 | struct clkdm_autodep *a = NULL; | |
335 | ||
336 | if (list_empty(&clkdm_list)) | |
337 | return -EACCES; | |
32d4034e | 338 | |
08cb9703 PW |
339 | if (!ia) |
340 | return -EINVAL; | |
d459bfe0 | 341 | |
55ed9694 | 342 | if (autodeps) |
08cb9703 PW |
343 | return -EEXIST; |
344 | ||
345 | autodeps = ia; | |
346 | for (a = autodeps; a->clkdm.ptr; a++) | |
347 | _autodep_lookup(a); | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | /** | |
353 | * clkdm_complete_init - set up the clockdomain layer | |
354 | * | |
355 | * Put all clockdomains into software-supervised mode; PM code should | |
356 | * later enable hardware-supervised mode as appropriate. Must be | |
357 | * called after clkdm_register_clkdms(). Returns -EACCES if called | |
358 | * before clkdm_register_clkdms(), or 0 upon success. | |
359 | */ | |
360 | int clkdm_complete_init(void) | |
361 | { | |
362 | struct clockdomain *clkdm; | |
363 | ||
364 | if (list_empty(&clkdm_list)) | |
365 | return -EACCES; | |
369d5614 | 366 | |
369d5614 | 367 | list_for_each_entry(clkdm, &clkdm_list, node) { |
6f7f63cc | 368 | if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP) |
68b921ad | 369 | clkdm_wakeup(clkdm); |
6f7f63cc | 370 | else if (clkdm->flags & CLKDM_CAN_DISABLE_AUTO) |
5cd1937b | 371 | clkdm_deny_idle(clkdm); |
6f7f63cc | 372 | |
4aef7a2a | 373 | _resolve_clkdm_deps(clkdm, clkdm->wkdep_srcs); |
6f7f63cc | 374 | clkdm_clear_all_wkdeps(clkdm); |
4aef7a2a RN |
375 | |
376 | _resolve_clkdm_deps(clkdm, clkdm->sleepdep_srcs); | |
6f7f63cc | 377 | clkdm_clear_all_sleepdeps(clkdm); |
369d5614 | 378 | } |
08cb9703 PW |
379 | |
380 | return 0; | |
d459bfe0 PW |
381 | } |
382 | ||
d459bfe0 PW |
383 | /** |
384 | * clkdm_lookup - look up a clockdomain by name, return a pointer | |
385 | * @name: name of clockdomain | |
386 | * | |
f0271d65 PW |
387 | * Find a registered clockdomain by its name @name. Returns a pointer |
388 | * to the struct clockdomain if found, or NULL otherwise. | |
d459bfe0 PW |
389 | */ |
390 | struct clockdomain *clkdm_lookup(const char *name) | |
391 | { | |
392 | struct clockdomain *clkdm, *temp_clkdm; | |
393 | ||
394 | if (!name) | |
395 | return NULL; | |
396 | ||
397 | clkdm = NULL; | |
398 | ||
d459bfe0 PW |
399 | list_for_each_entry(temp_clkdm, &clkdm_list, node) { |
400 | if (!strcmp(name, temp_clkdm->name)) { | |
401 | clkdm = temp_clkdm; | |
402 | break; | |
403 | } | |
404 | } | |
d459bfe0 PW |
405 | |
406 | return clkdm; | |
407 | } | |
408 | ||
409 | /** | |
410 | * clkdm_for_each - call function on each registered clockdomain | |
411 | * @fn: callback function * | |
412 | * | |
f0271d65 PW |
413 | * Call the supplied function @fn for each registered clockdomain. |
414 | * The callback function @fn can return anything but 0 to bail | |
d459bfe0 PW |
415 | * out early from the iterator. The callback function is called with |
416 | * the clkdm_mutex held, so no clockdomain structure manipulation | |
417 | * functions should be called from the callback, although hardware | |
418 | * clockdomain control functions are fine. Returns the last return | |
419 | * value of the callback function, which should be 0 for success or | |
420 | * anything else to indicate failure; or -EINVAL if the function pointer | |
421 | * is null. | |
422 | */ | |
a23456e9 PDS |
423 | int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user), |
424 | void *user) | |
d459bfe0 PW |
425 | { |
426 | struct clockdomain *clkdm; | |
427 | int ret = 0; | |
428 | ||
429 | if (!fn) | |
430 | return -EINVAL; | |
431 | ||
d459bfe0 | 432 | list_for_each_entry(clkdm, &clkdm_list, node) { |
a23456e9 | 433 | ret = (*fn)(clkdm, user); |
d459bfe0 PW |
434 | if (ret) |
435 | break; | |
436 | } | |
d459bfe0 PW |
437 | |
438 | return ret; | |
439 | } | |
440 | ||
441 | ||
e89087c9 PW |
442 | /** |
443 | * clkdm_get_pwrdm - return a ptr to the pwrdm that this clkdm resides in | |
444 | * @clkdm: struct clockdomain * | |
445 | * | |
446 | * Return a pointer to the struct powerdomain that the specified clockdomain | |
f0271d65 | 447 | * @clkdm exists in, or returns NULL if @clkdm is NULL. |
e89087c9 PW |
448 | */ |
449 | struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm) | |
450 | { | |
451 | if (!clkdm) | |
452 | return NULL; | |
453 | ||
5b74c676 | 454 | return clkdm->pwrdm.ptr; |
e89087c9 PW |
455 | } |
456 | ||
457 | ||
d459bfe0 PW |
458 | /* Hardware clockdomain control */ |
459 | ||
55ed9694 PW |
460 | /** |
461 | * clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1 | |
462 | * @clkdm1: wake this struct clockdomain * up (dependent) | |
463 | * @clkdm2: when this struct clockdomain * wakes up (source) | |
464 | * | |
465 | * When the clockdomain represented by @clkdm2 wakes up, wake up | |
466 | * @clkdm1. Implemented in hardware on the OMAP, this feature is | |
467 | * designed to reduce wakeup latency of the dependent clockdomain @clkdm1. | |
468 | * Returns -EINVAL if presented with invalid clockdomain pointers, | |
469 | * -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon | |
470 | * success. | |
471 | */ | |
472 | int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) | |
473 | { | |
474 | struct clkdm_dep *cd; | |
4aef7a2a | 475 | int ret = 0; |
56bc78d4 | 476 | |
55ed9694 PW |
477 | if (!clkdm1 || !clkdm2) |
478 | return -EINVAL; | |
479 | ||
480 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); | |
4aef7a2a RN |
481 | if (IS_ERR(cd)) |
482 | ret = PTR_ERR(cd); | |
483 | ||
484 | if (!arch_clkdm || !arch_clkdm->clkdm_add_wkdep) | |
485 | ret = -EINVAL; | |
486 | ||
487 | if (ret) { | |
55ed9694 PW |
488 | pr_debug("clockdomain: hardware cannot set/clear wake up of " |
489 | "%s when %s wakes up\n", clkdm1->name, clkdm2->name); | |
4aef7a2a | 490 | return ret; |
55ed9694 PW |
491 | } |
492 | ||
369d5614 PW |
493 | if (atomic_inc_return(&cd->wkdep_usecount) == 1) { |
494 | pr_debug("clockdomain: hardware will wake up %s when %s wakes " | |
495 | "up\n", clkdm1->name, clkdm2->name); | |
55ed9694 | 496 | |
4aef7a2a | 497 | ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2); |
369d5614 | 498 | } |
55ed9694 | 499 | |
4aef7a2a | 500 | return ret; |
55ed9694 PW |
501 | } |
502 | ||
503 | /** | |
504 | * clkdm_del_wkdep - remove a wakeup dependency from clkdm2 to clkdm1 | |
505 | * @clkdm1: wake this struct clockdomain * up (dependent) | |
506 | * @clkdm2: when this struct clockdomain * wakes up (source) | |
507 | * | |
508 | * Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2 | |
509 | * wakes up. Returns -EINVAL if presented with invalid clockdomain | |
510 | * pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or | |
511 | * 0 upon success. | |
512 | */ | |
513 | int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) | |
514 | { | |
515 | struct clkdm_dep *cd; | |
4aef7a2a | 516 | int ret = 0; |
56bc78d4 | 517 | |
55ed9694 PW |
518 | if (!clkdm1 || !clkdm2) |
519 | return -EINVAL; | |
520 | ||
521 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); | |
4aef7a2a RN |
522 | if (IS_ERR(cd)) |
523 | ret = PTR_ERR(cd); | |
524 | ||
525 | if (!arch_clkdm || !arch_clkdm->clkdm_del_wkdep) | |
526 | ret = -EINVAL; | |
527 | ||
528 | if (ret) { | |
55ed9694 PW |
529 | pr_debug("clockdomain: hardware cannot set/clear wake up of " |
530 | "%s when %s wakes up\n", clkdm1->name, clkdm2->name); | |
4aef7a2a | 531 | return ret; |
55ed9694 PW |
532 | } |
533 | ||
369d5614 PW |
534 | if (atomic_dec_return(&cd->wkdep_usecount) == 0) { |
535 | pr_debug("clockdomain: hardware will no longer wake up %s " | |
536 | "after %s wakes up\n", clkdm1->name, clkdm2->name); | |
55ed9694 | 537 | |
4aef7a2a | 538 | ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2); |
369d5614 | 539 | } |
55ed9694 | 540 | |
4aef7a2a | 541 | return ret; |
55ed9694 PW |
542 | } |
543 | ||
544 | /** | |
545 | * clkdm_read_wkdep - read wakeup dependency state from clkdm2 to clkdm1 | |
546 | * @clkdm1: wake this struct clockdomain * up (dependent) | |
547 | * @clkdm2: when this struct clockdomain * wakes up (source) | |
548 | * | |
549 | * Return 1 if a hardware wakeup dependency exists wherein @clkdm1 will be | |
550 | * awoken when @clkdm2 wakes up; 0 if dependency is not set; -EINVAL | |
551 | * if either clockdomain pointer is invalid; or -ENOENT if the hardware | |
552 | * is incapable. | |
553 | * | |
554 | * REVISIT: Currently this function only represents software-controllable | |
555 | * wakeup dependencies. Wakeup dependencies fixed in hardware are not | |
556 | * yet handled here. | |
557 | */ | |
558 | int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) | |
559 | { | |
560 | struct clkdm_dep *cd; | |
4aef7a2a | 561 | int ret = 0; |
55ed9694 PW |
562 | |
563 | if (!clkdm1 || !clkdm2) | |
564 | return -EINVAL; | |
565 | ||
566 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); | |
4aef7a2a RN |
567 | if (IS_ERR(cd)) |
568 | ret = PTR_ERR(cd); | |
569 | ||
570 | if (!arch_clkdm || !arch_clkdm->clkdm_read_wkdep) | |
571 | ret = -EINVAL; | |
572 | ||
573 | if (ret) { | |
55ed9694 PW |
574 | pr_debug("clockdomain: hardware cannot set/clear wake up of " |
575 | "%s when %s wakes up\n", clkdm1->name, clkdm2->name); | |
4aef7a2a | 576 | return ret; |
55ed9694 PW |
577 | } |
578 | ||
369d5614 | 579 | /* XXX It's faster to return the atomic wkdep_usecount */ |
4aef7a2a | 580 | return arch_clkdm->clkdm_read_wkdep(clkdm1, clkdm2); |
55ed9694 PW |
581 | } |
582 | ||
369d5614 PW |
583 | /** |
584 | * clkdm_clear_all_wkdeps - remove all wakeup dependencies from target clkdm | |
585 | * @clkdm: struct clockdomain * to remove all wakeup dependencies from | |
586 | * | |
587 | * Remove all inter-clockdomain wakeup dependencies that could cause | |
588 | * @clkdm to wake. Intended to be used during boot to initialize the | |
589 | * PRCM to a known state, after all clockdomains are put into swsup idle | |
590 | * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or | |
591 | * 0 upon success. | |
592 | */ | |
593 | int clkdm_clear_all_wkdeps(struct clockdomain *clkdm) | |
594 | { | |
369d5614 PW |
595 | if (!clkdm) |
596 | return -EINVAL; | |
597 | ||
4aef7a2a RN |
598 | if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_wkdeps) |
599 | return -EINVAL; | |
369d5614 | 600 | |
4aef7a2a | 601 | return arch_clkdm->clkdm_clear_all_wkdeps(clkdm); |
369d5614 PW |
602 | } |
603 | ||
55ed9694 PW |
604 | /** |
605 | * clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1 | |
606 | * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) | |
607 | * @clkdm2: when this struct clockdomain * is active (source) | |
608 | * | |
609 | * Prevent @clkdm1 from automatically going inactive (and then to | |
610 | * retention or off) if @clkdm2 is active. Returns -EINVAL if | |
611 | * presented with invalid clockdomain pointers or called on a machine | |
612 | * that does not support software-configurable hardware sleep | |
613 | * dependencies, -ENOENT if the specified dependency cannot be set in | |
614 | * hardware, or 0 upon success. | |
615 | */ | |
616 | int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) | |
617 | { | |
618 | struct clkdm_dep *cd; | |
4aef7a2a | 619 | int ret = 0; |
55ed9694 PW |
620 | |
621 | if (!clkdm1 || !clkdm2) | |
622 | return -EINVAL; | |
623 | ||
624 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); | |
4aef7a2a RN |
625 | if (IS_ERR(cd)) |
626 | ret = PTR_ERR(cd); | |
627 | ||
628 | if (!arch_clkdm || !arch_clkdm->clkdm_add_sleepdep) | |
629 | ret = -EINVAL; | |
630 | ||
631 | if (ret) { | |
55ed9694 PW |
632 | pr_debug("clockdomain: hardware cannot set/clear sleep " |
633 | "dependency affecting %s from %s\n", clkdm1->name, | |
634 | clkdm2->name); | |
4aef7a2a | 635 | return ret; |
55ed9694 PW |
636 | } |
637 | ||
369d5614 PW |
638 | if (atomic_inc_return(&cd->sleepdep_usecount) == 1) { |
639 | pr_debug("clockdomain: will prevent %s from sleeping if %s " | |
640 | "is active\n", clkdm1->name, clkdm2->name); | |
55ed9694 | 641 | |
4aef7a2a | 642 | ret = arch_clkdm->clkdm_add_sleepdep(clkdm1, clkdm2); |
369d5614 | 643 | } |
55ed9694 | 644 | |
4aef7a2a | 645 | return ret; |
55ed9694 PW |
646 | } |
647 | ||
648 | /** | |
649 | * clkdm_del_sleepdep - remove a sleep dependency from clkdm2 to clkdm1 | |
650 | * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) | |
651 | * @clkdm2: when this struct clockdomain * is active (source) | |
652 | * | |
653 | * Allow @clkdm1 to automatically go inactive (and then to retention or | |
654 | * off), independent of the activity state of @clkdm2. Returns -EINVAL | |
655 | * if presented with invalid clockdomain pointers or called on a machine | |
656 | * that does not support software-configurable hardware sleep dependencies, | |
657 | * -ENOENT if the specified dependency cannot be cleared in hardware, or | |
658 | * 0 upon success. | |
659 | */ | |
660 | int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) | |
661 | { | |
662 | struct clkdm_dep *cd; | |
4aef7a2a | 663 | int ret = 0; |
55ed9694 PW |
664 | |
665 | if (!clkdm1 || !clkdm2) | |
666 | return -EINVAL; | |
667 | ||
668 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); | |
4aef7a2a RN |
669 | if (IS_ERR(cd)) |
670 | ret = PTR_ERR(cd); | |
671 | ||
672 | if (!arch_clkdm || !arch_clkdm->clkdm_del_sleepdep) | |
673 | ret = -EINVAL; | |
674 | ||
675 | if (ret) { | |
55ed9694 PW |
676 | pr_debug("clockdomain: hardware cannot set/clear sleep " |
677 | "dependency affecting %s from %s\n", clkdm1->name, | |
678 | clkdm2->name); | |
4aef7a2a | 679 | return ret; |
55ed9694 PW |
680 | } |
681 | ||
369d5614 PW |
682 | if (atomic_dec_return(&cd->sleepdep_usecount) == 0) { |
683 | pr_debug("clockdomain: will no longer prevent %s from " | |
684 | "sleeping if %s is active\n", clkdm1->name, | |
685 | clkdm2->name); | |
55ed9694 | 686 | |
4aef7a2a | 687 | ret = arch_clkdm->clkdm_del_sleepdep(clkdm1, clkdm2); |
369d5614 | 688 | } |
55ed9694 | 689 | |
4aef7a2a | 690 | return ret; |
55ed9694 PW |
691 | } |
692 | ||
693 | /** | |
694 | * clkdm_read_sleepdep - read sleep dependency state from clkdm2 to clkdm1 | |
695 | * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) | |
696 | * @clkdm2: when this struct clockdomain * is active (source) | |
697 | * | |
698 | * Return 1 if a hardware sleep dependency exists wherein @clkdm1 will | |
699 | * not be allowed to automatically go inactive if @clkdm2 is active; | |
700 | * 0 if @clkdm1's automatic power state inactivity transition is independent | |
701 | * of @clkdm2's; -EINVAL if either clockdomain pointer is invalid or called | |
702 | * on a machine that does not support software-configurable hardware sleep | |
703 | * dependencies; or -ENOENT if the hardware is incapable. | |
704 | * | |
705 | * REVISIT: Currently this function only represents software-controllable | |
706 | * sleep dependencies. Sleep dependencies fixed in hardware are not | |
707 | * yet handled here. | |
708 | */ | |
709 | int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) | |
710 | { | |
711 | struct clkdm_dep *cd; | |
4aef7a2a | 712 | int ret = 0; |
55ed9694 PW |
713 | |
714 | if (!clkdm1 || !clkdm2) | |
715 | return -EINVAL; | |
716 | ||
717 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); | |
4aef7a2a RN |
718 | if (IS_ERR(cd)) |
719 | ret = PTR_ERR(cd); | |
720 | ||
721 | if (!arch_clkdm || !arch_clkdm->clkdm_read_sleepdep) | |
722 | ret = -EINVAL; | |
723 | ||
724 | if (ret) { | |
55ed9694 PW |
725 | pr_debug("clockdomain: hardware cannot set/clear sleep " |
726 | "dependency affecting %s from %s\n", clkdm1->name, | |
727 | clkdm2->name); | |
4aef7a2a | 728 | return ret; |
55ed9694 PW |
729 | } |
730 | ||
369d5614 | 731 | /* XXX It's faster to return the atomic sleepdep_usecount */ |
4aef7a2a | 732 | return arch_clkdm->clkdm_read_sleepdep(clkdm1, clkdm2); |
55ed9694 PW |
733 | } |
734 | ||
369d5614 PW |
735 | /** |
736 | * clkdm_clear_all_sleepdeps - remove all sleep dependencies from target clkdm | |
737 | * @clkdm: struct clockdomain * to remove all sleep dependencies from | |
738 | * | |
739 | * Remove all inter-clockdomain sleep dependencies that could prevent | |
740 | * @clkdm from idling. Intended to be used during boot to initialize the | |
741 | * PRCM to a known state, after all clockdomains are put into swsup idle | |
742 | * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or | |
743 | * 0 upon success. | |
744 | */ | |
745 | int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm) | |
746 | { | |
369d5614 PW |
747 | if (!clkdm) |
748 | return -EINVAL; | |
749 | ||
4aef7a2a RN |
750 | if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_sleepdeps) |
751 | return -EINVAL; | |
369d5614 | 752 | |
4aef7a2a | 753 | return arch_clkdm->clkdm_clear_all_sleepdeps(clkdm); |
369d5614 | 754 | } |
55ed9694 | 755 | |
d459bfe0 | 756 | /** |
68b921ad | 757 | * clkdm_sleep - force clockdomain sleep transition |
d459bfe0 PW |
758 | * @clkdm: struct clockdomain * |
759 | * | |
760 | * Instruct the CM to force a sleep transition on the specified | |
f0271d65 | 761 | * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if |
d459bfe0 PW |
762 | * clockdomain does not support software-initiated sleep; 0 upon |
763 | * success. | |
764 | */ | |
68b921ad | 765 | int clkdm_sleep(struct clockdomain *clkdm) |
d459bfe0 | 766 | { |
555e74ea RN |
767 | int ret; |
768 | unsigned long flags; | |
769 | ||
d459bfe0 PW |
770 | if (!clkdm) |
771 | return -EINVAL; | |
772 | ||
773 | if (!(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) { | |
774 | pr_debug("clockdomain: %s does not support forcing " | |
775 | "sleep via software\n", clkdm->name); | |
776 | return -EINVAL; | |
777 | } | |
778 | ||
68b921ad RN |
779 | if (!arch_clkdm || !arch_clkdm->clkdm_sleep) |
780 | return -EINVAL; | |
bd2122ca | 781 | |
68b921ad | 782 | pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name); |
d459bfe0 | 783 | |
555e74ea | 784 | spin_lock_irqsave(&clkdm->lock, flags); |
32a363c0 | 785 | clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; |
555e74ea RN |
786 | ret = arch_clkdm->clkdm_sleep(clkdm); |
787 | spin_unlock_irqrestore(&clkdm->lock, flags); | |
788 | return ret; | |
d459bfe0 PW |
789 | } |
790 | ||
791 | /** | |
68b921ad | 792 | * clkdm_wakeup - force clockdomain wakeup transition |
d459bfe0 PW |
793 | * @clkdm: struct clockdomain * |
794 | * | |
795 | * Instruct the CM to force a wakeup transition on the specified | |
f0271d65 | 796 | * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if the |
d459bfe0 PW |
797 | * clockdomain does not support software-controlled wakeup; 0 upon |
798 | * success. | |
799 | */ | |
68b921ad | 800 | int clkdm_wakeup(struct clockdomain *clkdm) |
d459bfe0 | 801 | { |
555e74ea RN |
802 | int ret; |
803 | unsigned long flags; | |
804 | ||
d459bfe0 PW |
805 | if (!clkdm) |
806 | return -EINVAL; | |
807 | ||
808 | if (!(clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)) { | |
809 | pr_debug("clockdomain: %s does not support forcing " | |
810 | "wakeup via software\n", clkdm->name); | |
811 | return -EINVAL; | |
812 | } | |
813 | ||
68b921ad RN |
814 | if (!arch_clkdm || !arch_clkdm->clkdm_wakeup) |
815 | return -EINVAL; | |
bd2122ca | 816 | |
68b921ad | 817 | pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name); |
d459bfe0 | 818 | |
555e74ea | 819 | spin_lock_irqsave(&clkdm->lock, flags); |
32a363c0 | 820 | clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; |
555e74ea | 821 | ret = arch_clkdm->clkdm_wakeup(clkdm); |
b1cbdb00 | 822 | ret |= pwrdm_state_switch(clkdm->pwrdm.ptr); |
555e74ea RN |
823 | spin_unlock_irqrestore(&clkdm->lock, flags); |
824 | return ret; | |
d459bfe0 PW |
825 | } |
826 | ||
827 | /** | |
5cd1937b | 828 | * clkdm_allow_idle - enable hwsup idle transitions for clkdm |
d459bfe0 PW |
829 | * @clkdm: struct clockdomain * |
830 | * | |
f0271d65 | 831 | * Allow the hardware to automatically switch the clockdomain @clkdm into |
d459bfe0 PW |
832 | * active or idle states, as needed by downstream clocks. If the |
833 | * clockdomain has any downstream clocks enabled in the clock | |
834 | * framework, wkdep/sleepdep autodependencies are added; this is so | |
835 | * device drivers can read and write to the device. No return value. | |
836 | */ | |
5cd1937b | 837 | void clkdm_allow_idle(struct clockdomain *clkdm) |
d459bfe0 | 838 | { |
555e74ea RN |
839 | unsigned long flags; |
840 | ||
d459bfe0 PW |
841 | if (!clkdm) |
842 | return; | |
843 | ||
844 | if (!(clkdm->flags & CLKDM_CAN_ENABLE_AUTO)) { | |
845 | pr_debug("clock: automatic idle transitions cannot be enabled " | |
846 | "on clockdomain %s\n", clkdm->name); | |
847 | return; | |
848 | } | |
849 | ||
5cd1937b RN |
850 | if (!arch_clkdm || !arch_clkdm->clkdm_allow_idle) |
851 | return; | |
852 | ||
d459bfe0 PW |
853 | pr_debug("clockdomain: enabling automatic idle transitions for %s\n", |
854 | clkdm->name); | |
855 | ||
555e74ea | 856 | spin_lock_irqsave(&clkdm->lock, flags); |
32a363c0 | 857 | clkdm->_flags |= _CLKDM_FLAG_HWSUP_ENABLED; |
5cd1937b | 858 | arch_clkdm->clkdm_allow_idle(clkdm); |
ba20bb12 | 859 | pwrdm_clkdm_state_switch(clkdm); |
555e74ea | 860 | spin_unlock_irqrestore(&clkdm->lock, flags); |
d459bfe0 PW |
861 | } |
862 | ||
863 | /** | |
5cd1937b | 864 | * clkdm_deny_idle - disable hwsup idle transitions for clkdm |
d459bfe0 PW |
865 | * @clkdm: struct clockdomain * |
866 | * | |
867 | * Prevent the hardware from automatically switching the clockdomain | |
f0271d65 PW |
868 | * @clkdm into inactive or idle states. If the clockdomain has |
869 | * downstream clocks enabled in the clock framework, wkdep/sleepdep | |
d459bfe0 PW |
870 | * autodependencies are removed. No return value. |
871 | */ | |
5cd1937b | 872 | void clkdm_deny_idle(struct clockdomain *clkdm) |
d459bfe0 | 873 | { |
555e74ea RN |
874 | unsigned long flags; |
875 | ||
d459bfe0 PW |
876 | if (!clkdm) |
877 | return; | |
878 | ||
879 | if (!(clkdm->flags & CLKDM_CAN_DISABLE_AUTO)) { | |
880 | pr_debug("clockdomain: automatic idle transitions cannot be " | |
881 | "disabled on %s\n", clkdm->name); | |
882 | return; | |
883 | } | |
884 | ||
5cd1937b RN |
885 | if (!arch_clkdm || !arch_clkdm->clkdm_deny_idle) |
886 | return; | |
887 | ||
d459bfe0 PW |
888 | pr_debug("clockdomain: disabling automatic idle transitions for %s\n", |
889 | clkdm->name); | |
890 | ||
555e74ea | 891 | spin_lock_irqsave(&clkdm->lock, flags); |
32a363c0 | 892 | clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; |
5cd1937b | 893 | arch_clkdm->clkdm_deny_idle(clkdm); |
b1cbdb00 | 894 | pwrdm_state_switch(clkdm->pwrdm.ptr); |
555e74ea | 895 | spin_unlock_irqrestore(&clkdm->lock, flags); |
d459bfe0 PW |
896 | } |
897 | ||
32a363c0 PW |
898 | /** |
899 | * clkdm_in_hwsup - is clockdomain @clkdm have hardware-supervised idle enabled? | |
900 | * @clkdm: struct clockdomain * | |
901 | * | |
902 | * Returns true if clockdomain @clkdm currently has | |
903 | * hardware-supervised idle enabled, or false if it does not or if | |
904 | * @clkdm is NULL. It is only valid to call this function after | |
905 | * clkdm_init() has been called. This function does not actually read | |
906 | * bits from the hardware; it instead tests an in-memory flag that is | |
907 | * changed whenever the clockdomain code changes the auto-idle mode. | |
908 | */ | |
909 | bool clkdm_in_hwsup(struct clockdomain *clkdm) | |
910 | { | |
555e74ea RN |
911 | bool ret; |
912 | unsigned long flags; | |
913 | ||
32a363c0 PW |
914 | if (!clkdm) |
915 | return false; | |
916 | ||
555e74ea RN |
917 | spin_lock_irqsave(&clkdm->lock, flags); |
918 | ret = (clkdm->_flags & _CLKDM_FLAG_HWSUP_ENABLED) ? true : false; | |
919 | spin_unlock_irqrestore(&clkdm->lock, flags); | |
920 | ||
921 | return ret; | |
32a363c0 | 922 | } |
d459bfe0 | 923 | |
113a7413 BC |
924 | /* Clockdomain-to-clock/hwmod framework interface code */ |
925 | ||
926 | static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm) | |
927 | { | |
555e74ea RN |
928 | unsigned long flags; |
929 | ||
113a7413 BC |
930 | if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_enable) |
931 | return -EINVAL; | |
932 | ||
933 | /* | |
934 | * For arch's with no autodeps, clkcm_clk_enable | |
935 | * should be called for every clock instance or hwmod that is | |
936 | * enabled, so the clkdm can be force woken up. | |
937 | */ | |
938 | if ((atomic_inc_return(&clkdm->usecount) > 1) && autodeps) | |
939 | return 0; | |
940 | ||
555e74ea | 941 | spin_lock_irqsave(&clkdm->lock, flags); |
113a7413 BC |
942 | arch_clkdm->clkdm_clk_enable(clkdm); |
943 | pwrdm_wait_transition(clkdm->pwrdm.ptr); | |
944 | pwrdm_clkdm_state_switch(clkdm); | |
555e74ea | 945 | spin_unlock_irqrestore(&clkdm->lock, flags); |
113a7413 BC |
946 | |
947 | pr_debug("clockdomain: clkdm %s: enabled\n", clkdm->name); | |
948 | ||
949 | return 0; | |
950 | } | |
951 | ||
952 | static int _clkdm_clk_hwmod_disable(struct clockdomain *clkdm) | |
953 | { | |
555e74ea RN |
954 | unsigned long flags; |
955 | ||
113a7413 BC |
956 | if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_disable) |
957 | return -EINVAL; | |
958 | ||
959 | if (atomic_read(&clkdm->usecount) == 0) { | |
960 | WARN_ON(1); /* underflow */ | |
961 | return -ERANGE; | |
962 | } | |
963 | ||
964 | if (atomic_dec_return(&clkdm->usecount) > 0) | |
965 | return 0; | |
966 | ||
555e74ea | 967 | spin_lock_irqsave(&clkdm->lock, flags); |
113a7413 BC |
968 | arch_clkdm->clkdm_clk_disable(clkdm); |
969 | pwrdm_clkdm_state_switch(clkdm); | |
555e74ea | 970 | spin_unlock_irqrestore(&clkdm->lock, flags); |
113a7413 BC |
971 | |
972 | pr_debug("clockdomain: clkdm %s: disabled\n", clkdm->name); | |
973 | ||
974 | return 0; | |
975 | } | |
d459bfe0 PW |
976 | |
977 | /** | |
4da71ae6 | 978 | * clkdm_clk_enable - add an enabled downstream clock to this clkdm |
d459bfe0 PW |
979 | * @clkdm: struct clockdomain * |
980 | * @clk: struct clk * of the enabled downstream clock | |
981 | * | |
f0271d65 PW |
982 | * Increment the usecount of the clockdomain @clkdm and ensure that it |
983 | * is awake before @clk is enabled. Intended to be called by | |
984 | * clk_enable() code. If the clockdomain is in software-supervised | |
985 | * idle mode, force the clockdomain to wake. If the clockdomain is in | |
986 | * hardware-supervised idle mode, add clkdm-pwrdm autodependencies, to | |
987 | * ensure that devices in the clockdomain can be read from/written to | |
988 | * by on-chip processors. Returns -EINVAL if passed null pointers; | |
989 | * returns 0 upon success or if the clockdomain is in hwsup idle mode. | |
d459bfe0 | 990 | */ |
4da71ae6 | 991 | int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk) |
d459bfe0 | 992 | { |
d459bfe0 PW |
993 | /* |
994 | * XXX Rewrite this code to maintain a list of enabled | |
995 | * downstream clocks for debugging purposes? | |
996 | */ | |
997 | ||
113a7413 | 998 | if (!clk) |
d459bfe0 PW |
999 | return -EINVAL; |
1000 | ||
113a7413 | 1001 | return _clkdm_clk_hwmod_enable(clkdm); |
d459bfe0 PW |
1002 | } |
1003 | ||
1004 | /** | |
4da71ae6 | 1005 | * clkdm_clk_disable - remove an enabled downstream clock from this clkdm |
d459bfe0 PW |
1006 | * @clkdm: struct clockdomain * |
1007 | * @clk: struct clk * of the disabled downstream clock | |
1008 | * | |
f0271d65 PW |
1009 | * Decrement the usecount of this clockdomain @clkdm when @clk is |
1010 | * disabled. Intended to be called by clk_disable() code. If the | |
1011 | * clockdomain usecount goes to 0, put the clockdomain to sleep | |
1012 | * (software-supervised mode) or remove the clkdm autodependencies | |
1013 | * (hardware-supervised mode). Returns -EINVAL if passed null | |
113a7413 BC |
1014 | * pointers; -ERANGE if the @clkdm usecount underflows; or returns 0 |
1015 | * upon success or if the clockdomain is in hwsup idle mode. | |
d459bfe0 | 1016 | */ |
4da71ae6 | 1017 | int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk) |
d459bfe0 | 1018 | { |
d459bfe0 PW |
1019 | /* |
1020 | * XXX Rewrite this code to maintain a list of enabled | |
1021 | * downstream clocks for debugging purposes? | |
1022 | */ | |
1023 | ||
113a7413 | 1024 | if (!clk) |
d459bfe0 PW |
1025 | return -EINVAL; |
1026 | ||
113a7413 BC |
1027 | return _clkdm_clk_hwmod_disable(clkdm); |
1028 | } | |
1029 | ||
1030 | /** | |
1031 | * clkdm_hwmod_enable - add an enabled downstream hwmod to this clkdm | |
1032 | * @clkdm: struct clockdomain * | |
1033 | * @oh: struct omap_hwmod * of the enabled downstream hwmod | |
1034 | * | |
1035 | * Increment the usecount of the clockdomain @clkdm and ensure that it | |
1036 | * is awake before @oh is enabled. Intended to be called by | |
1037 | * module_enable() code. | |
1038 | * If the clockdomain is in software-supervised idle mode, force the | |
1039 | * clockdomain to wake. If the clockdomain is in hardware-supervised idle | |
1040 | * mode, add clkdm-pwrdm autodependencies, to ensure that devices in the | |
1041 | * clockdomain can be read from/written to by on-chip processors. | |
1042 | * Returns -EINVAL if passed null pointers; | |
1043 | * returns 0 upon success or if the clockdomain is in hwsup idle mode. | |
1044 | */ | |
1045 | int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh) | |
1046 | { | |
1047 | /* The clkdm attribute does not exist yet prior OMAP4 */ | |
1048 | if (cpu_is_omap24xx() || cpu_is_omap34xx()) | |
1049 | return 0; | |
1050 | ||
1051 | /* | |
1052 | * XXX Rewrite this code to maintain a list of enabled | |
1053 | * downstream hwmods for debugging purposes? | |
1054 | */ | |
1055 | ||
1056 | if (!oh) | |
4da71ae6 RN |
1057 | return -EINVAL; |
1058 | ||
113a7413 BC |
1059 | return _clkdm_clk_hwmod_enable(clkdm); |
1060 | } | |
d459bfe0 | 1061 | |
113a7413 BC |
1062 | /** |
1063 | * clkdm_hwmod_disable - remove an enabled downstream hwmod from this clkdm | |
1064 | * @clkdm: struct clockdomain * | |
1065 | * @oh: struct omap_hwmod * of the disabled downstream hwmod | |
1066 | * | |
1067 | * Decrement the usecount of this clockdomain @clkdm when @oh is | |
1068 | * disabled. Intended to be called by module_disable() code. | |
1069 | * If the clockdomain usecount goes to 0, put the clockdomain to sleep | |
1070 | * (software-supervised mode) or remove the clkdm autodependencies | |
1071 | * (hardware-supervised mode). | |
1072 | * Returns -EINVAL if passed null pointers; -ERANGE if the @clkdm usecount | |
1073 | * underflows; or returns 0 upon success or if the clockdomain is in hwsup | |
1074 | * idle mode. | |
1075 | */ | |
1076 | int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh) | |
1077 | { | |
1078 | /* The clkdm attribute does not exist yet prior OMAP4 */ | |
1079 | if (cpu_is_omap24xx() || cpu_is_omap34xx()) | |
d459bfe0 PW |
1080 | return 0; |
1081 | ||
113a7413 BC |
1082 | /* |
1083 | * XXX Rewrite this code to maintain a list of enabled | |
1084 | * downstream hwmods for debugging purposes? | |
1085 | */ | |
d459bfe0 | 1086 | |
113a7413 BC |
1087 | if (!oh) |
1088 | return -EINVAL; | |
fe617af7 | 1089 | |
113a7413 | 1090 | return _clkdm_clk_hwmod_disable(clkdm); |
d459bfe0 PW |
1091 | } |
1092 |