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d459bfe0 PW |
1 | /* |
2 | * OMAP2/3 clockdomain framework functions | |
3 | * | |
4 | * Copyright (C) 2008 Texas Instruments, Inc. | |
5 | * Copyright (C) 2008 Nokia Corporation | |
6 | * | |
7 | * Written by Paul Walmsley and Jouni Högander | |
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_CLOCKDOMAIN | |
14 | # define DEBUG | |
15 | #endif | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/clk.h> | |
24 | #include <linux/limits.h> | |
5b74c676 | 25 | #include <linux/err.h> |
d459bfe0 PW |
26 | |
27 | #include <linux/io.h> | |
28 | ||
29 | #include <linux/bitops.h> | |
30 | ||
31 | #include <mach/clock.h> | |
32 | ||
33 | #include "prm.h" | |
34 | #include "prm-regbits-24xx.h" | |
35 | #include "cm.h" | |
36 | ||
37 | #include <mach/powerdomain.h> | |
38 | #include <mach/clockdomain.h> | |
39 | ||
40 | /* clkdm_list contains all registered struct clockdomains */ | |
41 | static LIST_HEAD(clkdm_list); | |
42 | ||
43 | /* clkdm_mutex protects clkdm_list add and del ops */ | |
44 | static DEFINE_MUTEX(clkdm_mutex); | |
45 | ||
46 | /* array of powerdomain deps to be added/removed when clkdm in hwsup mode */ | |
47 | static struct clkdm_pwrdm_autodep *autodeps; | |
48 | ||
49 | ||
50 | /* Private functions */ | |
51 | ||
52 | /* | |
53 | * _autodep_lookup - resolve autodep pwrdm names to pwrdm pointers; store | |
54 | * @autodep: struct clkdm_pwrdm_autodep * to resolve | |
55 | * | |
56 | * Resolve autodep powerdomain names to powerdomain pointers via | |
57 | * pwrdm_lookup() and store the pointers in the autodep structure. An | |
58 | * "autodep" is a powerdomain sleep/wakeup dependency that is | |
59 | * automatically added and removed whenever clocks in the associated | |
60 | * clockdomain are enabled or disabled (respectively) when the | |
61 | * clockdomain is in hardware-supervised mode. Meant to be called | |
62 | * once at clockdomain layer initialization, since these should remain | |
63 | * fixed for a particular architecture. No return value. | |
64 | */ | |
65 | static void _autodep_lookup(struct clkdm_pwrdm_autodep *autodep) | |
66 | { | |
67 | struct powerdomain *pwrdm; | |
68 | ||
69 | if (!autodep) | |
70 | return; | |
71 | ||
72 | if (!omap_chip_is(autodep->omap_chip)) | |
73 | return; | |
74 | ||
5b74c676 | 75 | pwrdm = pwrdm_lookup(autodep->pwrdm.name); |
d459bfe0 PW |
76 | if (!pwrdm) { |
77 | pr_debug("clockdomain: _autodep_lookup: powerdomain %s " | |
5b74c676 | 78 | "does not exist\n", autodep->pwrdm.name); |
d459bfe0 | 79 | WARN_ON(1); |
5b74c676 | 80 | pwrdm = ERR_PTR(-ENOENT); |
d459bfe0 | 81 | } |
5b74c676 | 82 | autodep->pwrdm.ptr = pwrdm; |
d459bfe0 PW |
83 | |
84 | return; | |
85 | } | |
86 | ||
87 | /* | |
88 | * _clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable | |
89 | * @clkdm: struct clockdomain * | |
90 | * | |
91 | * Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm' | |
92 | * in hardware-supervised mode. Meant to be called from clock framework | |
93 | * when a clock inside clockdomain 'clkdm' is enabled. No return value. | |
94 | */ | |
95 | static void _clkdm_add_autodeps(struct clockdomain *clkdm) | |
96 | { | |
97 | struct clkdm_pwrdm_autodep *autodep; | |
98 | ||
5b74c676 PW |
99 | for (autodep = autodeps; autodep->pwrdm.ptr; autodep++) { |
100 | if (IS_ERR(autodep->pwrdm.ptr)) | |
d459bfe0 PW |
101 | continue; |
102 | ||
103 | pr_debug("clockdomain: adding %s sleepdep/wkdep for " | |
5b74c676 PW |
104 | "pwrdm %s\n", autodep->pwrdm.ptr->name, |
105 | clkdm->pwrdm.ptr->name); | |
d459bfe0 | 106 | |
5b74c676 PW |
107 | pwrdm_add_sleepdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr); |
108 | pwrdm_add_wkdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr); | |
d459bfe0 PW |
109 | } |
110 | } | |
111 | ||
112 | /* | |
113 | * _clkdm_add_autodeps - remove auto sleepdeps/wkdeps from clkdm | |
114 | * @clkdm: struct clockdomain * | |
115 | * | |
116 | * Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm' | |
117 | * in hardware-supervised mode. Meant to be called from clock framework | |
118 | * when a clock inside clockdomain 'clkdm' is disabled. No return value. | |
119 | */ | |
120 | static void _clkdm_del_autodeps(struct clockdomain *clkdm) | |
121 | { | |
122 | struct clkdm_pwrdm_autodep *autodep; | |
123 | ||
5b74c676 PW |
124 | for (autodep = autodeps; autodep->pwrdm.ptr; autodep++) { |
125 | if (IS_ERR(autodep->pwrdm.ptr)) | |
d459bfe0 PW |
126 | continue; |
127 | ||
128 | pr_debug("clockdomain: removing %s sleepdep/wkdep for " | |
5b74c676 PW |
129 | "pwrdm %s\n", autodep->pwrdm.ptr->name, |
130 | clkdm->pwrdm.ptr->name); | |
d459bfe0 | 131 | |
5b74c676 PW |
132 | pwrdm_del_sleepdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr); |
133 | pwrdm_del_wkdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr); | |
d459bfe0 PW |
134 | } |
135 | } | |
136 | ||
137 | ||
138 | static struct clockdomain *_clkdm_lookup(const char *name) | |
139 | { | |
140 | struct clockdomain *clkdm, *temp_clkdm; | |
141 | ||
142 | if (!name) | |
143 | return NULL; | |
144 | ||
145 | clkdm = NULL; | |
146 | ||
147 | list_for_each_entry(temp_clkdm, &clkdm_list, node) { | |
148 | if (!strcmp(name, temp_clkdm->name)) { | |
149 | clkdm = temp_clkdm; | |
150 | break; | |
151 | } | |
152 | } | |
153 | ||
154 | return clkdm; | |
155 | } | |
156 | ||
157 | ||
158 | /* Public functions */ | |
159 | ||
160 | /** | |
161 | * clkdm_init - set up the clockdomain layer | |
162 | * @clkdms: optional pointer to an array of clockdomains to register | |
163 | * @init_autodeps: optional pointer to an array of autodeps to register | |
164 | * | |
165 | * Set up internal state. If a pointer to an array of clockdomains | |
166 | * was supplied, loop through the list of clockdomains, register all | |
167 | * that are available on the current platform. Similarly, if a | |
168 | * pointer to an array of clockdomain-powerdomain autodependencies was | |
169 | * provided, register those. No return value. | |
170 | */ | |
171 | void clkdm_init(struct clockdomain **clkdms, | |
172 | struct clkdm_pwrdm_autodep *init_autodeps) | |
173 | { | |
174 | struct clockdomain **c = NULL; | |
175 | struct clkdm_pwrdm_autodep *autodep = NULL; | |
176 | ||
177 | if (clkdms) | |
178 | for (c = clkdms; *c; c++) | |
179 | clkdm_register(*c); | |
180 | ||
181 | autodeps = init_autodeps; | |
182 | if (autodeps) | |
5b74c676 | 183 | for (autodep = autodeps; autodep->pwrdm.ptr; autodep++) |
d459bfe0 PW |
184 | _autodep_lookup(autodep); |
185 | } | |
186 | ||
187 | /** | |
188 | * clkdm_register - register a clockdomain | |
189 | * @clkdm: struct clockdomain * to register | |
190 | * | |
191 | * Adds a clockdomain to the internal clockdomain list. | |
192 | * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is | |
193 | * already registered by the provided name, or 0 upon success. | |
194 | */ | |
195 | int clkdm_register(struct clockdomain *clkdm) | |
196 | { | |
197 | int ret = -EINVAL; | |
198 | struct powerdomain *pwrdm; | |
199 | ||
200 | if (!clkdm || !clkdm->name) | |
201 | return -EINVAL; | |
202 | ||
203 | if (!omap_chip_is(clkdm->omap_chip)) | |
204 | return -EINVAL; | |
205 | ||
5b74c676 | 206 | pwrdm = pwrdm_lookup(clkdm->pwrdm.name); |
d459bfe0 PW |
207 | if (!pwrdm) { |
208 | pr_debug("clockdomain: clkdm_register %s: powerdomain %s " | |
5b74c676 | 209 | "does not exist\n", clkdm->name, clkdm->pwrdm.name); |
d459bfe0 PW |
210 | return -EINVAL; |
211 | } | |
5b74c676 | 212 | clkdm->pwrdm.ptr = pwrdm; |
d459bfe0 PW |
213 | |
214 | mutex_lock(&clkdm_mutex); | |
215 | /* Verify that the clockdomain is not already registered */ | |
216 | if (_clkdm_lookup(clkdm->name)) { | |
217 | ret = -EEXIST; | |
218 | goto cr_unlock; | |
219 | }; | |
220 | ||
221 | list_add(&clkdm->node, &clkdm_list); | |
222 | ||
8420bb13 PW |
223 | pwrdm_add_clkdm(pwrdm, clkdm); |
224 | ||
d459bfe0 PW |
225 | pr_debug("clockdomain: registered %s\n", clkdm->name); |
226 | ret = 0; | |
227 | ||
228 | cr_unlock: | |
229 | mutex_unlock(&clkdm_mutex); | |
230 | ||
231 | return ret; | |
232 | } | |
233 | ||
234 | /** | |
235 | * clkdm_unregister - unregister a clockdomain | |
236 | * @clkdm: struct clockdomain * to unregister | |
237 | * | |
238 | * Removes a clockdomain from the internal clockdomain list. Returns | |
239 | * -EINVAL if clkdm argument is NULL. | |
240 | */ | |
241 | int clkdm_unregister(struct clockdomain *clkdm) | |
242 | { | |
243 | if (!clkdm) | |
244 | return -EINVAL; | |
245 | ||
5b74c676 | 246 | pwrdm_del_clkdm(clkdm->pwrdm.ptr, clkdm); |
8420bb13 | 247 | |
d459bfe0 PW |
248 | mutex_lock(&clkdm_mutex); |
249 | list_del(&clkdm->node); | |
250 | mutex_unlock(&clkdm_mutex); | |
251 | ||
252 | pr_debug("clockdomain: unregistered %s\n", clkdm->name); | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | /** | |
258 | * clkdm_lookup - look up a clockdomain by name, return a pointer | |
259 | * @name: name of clockdomain | |
260 | * | |
261 | * Find a registered clockdomain by its name. Returns a pointer to the | |
262 | * struct clockdomain if found, or NULL otherwise. | |
263 | */ | |
264 | struct clockdomain *clkdm_lookup(const char *name) | |
265 | { | |
266 | struct clockdomain *clkdm, *temp_clkdm; | |
267 | ||
268 | if (!name) | |
269 | return NULL; | |
270 | ||
271 | clkdm = NULL; | |
272 | ||
273 | mutex_lock(&clkdm_mutex); | |
274 | list_for_each_entry(temp_clkdm, &clkdm_list, node) { | |
275 | if (!strcmp(name, temp_clkdm->name)) { | |
276 | clkdm = temp_clkdm; | |
277 | break; | |
278 | } | |
279 | } | |
280 | mutex_unlock(&clkdm_mutex); | |
281 | ||
282 | return clkdm; | |
283 | } | |
284 | ||
285 | /** | |
286 | * clkdm_for_each - call function on each registered clockdomain | |
287 | * @fn: callback function * | |
288 | * | |
289 | * Call the supplied function for each registered clockdomain. | |
290 | * The callback function can return anything but 0 to bail | |
291 | * out early from the iterator. The callback function is called with | |
292 | * the clkdm_mutex held, so no clockdomain structure manipulation | |
293 | * functions should be called from the callback, although hardware | |
294 | * clockdomain control functions are fine. Returns the last return | |
295 | * value of the callback function, which should be 0 for success or | |
296 | * anything else to indicate failure; or -EINVAL if the function pointer | |
297 | * is null. | |
298 | */ | |
299 | int clkdm_for_each(int (*fn)(struct clockdomain *clkdm)) | |
300 | { | |
301 | struct clockdomain *clkdm; | |
302 | int ret = 0; | |
303 | ||
304 | if (!fn) | |
305 | return -EINVAL; | |
306 | ||
307 | mutex_lock(&clkdm_mutex); | |
308 | list_for_each_entry(clkdm, &clkdm_list, node) { | |
309 | ret = (*fn)(clkdm); | |
310 | if (ret) | |
311 | break; | |
312 | } | |
313 | mutex_unlock(&clkdm_mutex); | |
314 | ||
315 | return ret; | |
316 | } | |
317 | ||
318 | ||
e89087c9 PW |
319 | /** |
320 | * clkdm_get_pwrdm - return a ptr to the pwrdm that this clkdm resides in | |
321 | * @clkdm: struct clockdomain * | |
322 | * | |
323 | * Return a pointer to the struct powerdomain that the specified clockdomain | |
324 | * 'clkdm' exists in, or returns NULL if clkdm argument is NULL. | |
325 | */ | |
326 | struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm) | |
327 | { | |
328 | if (!clkdm) | |
329 | return NULL; | |
330 | ||
5b74c676 | 331 | return clkdm->pwrdm.ptr; |
e89087c9 PW |
332 | } |
333 | ||
334 | ||
d459bfe0 PW |
335 | /* Hardware clockdomain control */ |
336 | ||
337 | /** | |
338 | * omap2_clkdm_clktrctrl_read - read the clkdm's current state transition mode | |
339 | * @clk: struct clk * of a clockdomain | |
340 | * | |
341 | * Return the clockdomain's current state transition mode from the | |
342 | * corresponding domain CM_CLKSTCTRL register. Returns -EINVAL if clk | |
343 | * is NULL or the current mode upon success. | |
344 | */ | |
345 | static int omap2_clkdm_clktrctrl_read(struct clockdomain *clkdm) | |
346 | { | |
347 | u32 v; | |
348 | ||
349 | if (!clkdm) | |
350 | return -EINVAL; | |
351 | ||
5b74c676 | 352 | v = cm_read_mod_reg(clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL); |
d459bfe0 PW |
353 | v &= clkdm->clktrctrl_mask; |
354 | v >>= __ffs(clkdm->clktrctrl_mask); | |
355 | ||
356 | return v; | |
357 | } | |
358 | ||
359 | /** | |
360 | * omap2_clkdm_sleep - force clockdomain sleep transition | |
361 | * @clkdm: struct clockdomain * | |
362 | * | |
363 | * Instruct the CM to force a sleep transition on the specified | |
364 | * clockdomain 'clkdm'. Returns -EINVAL if clk is NULL or if | |
365 | * clockdomain does not support software-initiated sleep; 0 upon | |
366 | * success. | |
367 | */ | |
368 | int omap2_clkdm_sleep(struct clockdomain *clkdm) | |
369 | { | |
370 | if (!clkdm) | |
371 | return -EINVAL; | |
372 | ||
373 | if (!(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) { | |
374 | pr_debug("clockdomain: %s does not support forcing " | |
375 | "sleep via software\n", clkdm->name); | |
376 | return -EINVAL; | |
377 | } | |
378 | ||
379 | pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name); | |
380 | ||
381 | if (cpu_is_omap24xx()) { | |
382 | ||
383 | cm_set_mod_reg_bits(OMAP24XX_FORCESTATE, | |
5b74c676 | 384 | clkdm->pwrdm.ptr->prcm_offs, PM_PWSTCTRL); |
d459bfe0 PW |
385 | |
386 | } else if (cpu_is_omap34xx()) { | |
387 | ||
388 | u32 v = (OMAP34XX_CLKSTCTRL_FORCE_SLEEP << | |
389 | __ffs(clkdm->clktrctrl_mask)); | |
390 | ||
391 | cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, v, | |
5b74c676 | 392 | clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL); |
d459bfe0 PW |
393 | |
394 | } else { | |
395 | BUG(); | |
396 | }; | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | /** | |
402 | * omap2_clkdm_wakeup - force clockdomain wakeup transition | |
403 | * @clkdm: struct clockdomain * | |
404 | * | |
405 | * Instruct the CM to force a wakeup transition on the specified | |
406 | * clockdomain 'clkdm'. Returns -EINVAL if clkdm is NULL or if the | |
407 | * clockdomain does not support software-controlled wakeup; 0 upon | |
408 | * success. | |
409 | */ | |
410 | int omap2_clkdm_wakeup(struct clockdomain *clkdm) | |
411 | { | |
412 | if (!clkdm) | |
413 | return -EINVAL; | |
414 | ||
415 | if (!(clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)) { | |
416 | pr_debug("clockdomain: %s does not support forcing " | |
417 | "wakeup via software\n", clkdm->name); | |
418 | return -EINVAL; | |
419 | } | |
420 | ||
421 | pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name); | |
422 | ||
423 | if (cpu_is_omap24xx()) { | |
424 | ||
425 | cm_clear_mod_reg_bits(OMAP24XX_FORCESTATE, | |
5b74c676 | 426 | clkdm->pwrdm.ptr->prcm_offs, PM_PWSTCTRL); |
d459bfe0 PW |
427 | |
428 | } else if (cpu_is_omap34xx()) { | |
429 | ||
430 | u32 v = (OMAP34XX_CLKSTCTRL_FORCE_WAKEUP << | |
431 | __ffs(clkdm->clktrctrl_mask)); | |
432 | ||
433 | cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, v, | |
5b74c676 | 434 | clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL); |
d459bfe0 PW |
435 | |
436 | } else { | |
437 | BUG(); | |
438 | }; | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
443 | /** | |
444 | * omap2_clkdm_allow_idle - enable hwsup idle transitions for clkdm | |
445 | * @clkdm: struct clockdomain * | |
446 | * | |
447 | * Allow the hardware to automatically switch the clockdomain into | |
448 | * active or idle states, as needed by downstream clocks. If the | |
449 | * clockdomain has any downstream clocks enabled in the clock | |
450 | * framework, wkdep/sleepdep autodependencies are added; this is so | |
451 | * device drivers can read and write to the device. No return value. | |
452 | */ | |
453 | void omap2_clkdm_allow_idle(struct clockdomain *clkdm) | |
454 | { | |
455 | u32 v; | |
456 | ||
457 | if (!clkdm) | |
458 | return; | |
459 | ||
460 | if (!(clkdm->flags & CLKDM_CAN_ENABLE_AUTO)) { | |
461 | pr_debug("clock: automatic idle transitions cannot be enabled " | |
462 | "on clockdomain %s\n", clkdm->name); | |
463 | return; | |
464 | } | |
465 | ||
466 | pr_debug("clockdomain: enabling automatic idle transitions for %s\n", | |
467 | clkdm->name); | |
468 | ||
469 | if (atomic_read(&clkdm->usecount) > 0) | |
470 | _clkdm_add_autodeps(clkdm); | |
471 | ||
472 | if (cpu_is_omap24xx()) | |
473 | v = OMAP24XX_CLKSTCTRL_ENABLE_AUTO; | |
474 | else if (cpu_is_omap34xx()) | |
475 | v = OMAP34XX_CLKSTCTRL_ENABLE_AUTO; | |
476 | else | |
477 | BUG(); | |
478 | ||
479 | ||
480 | cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, | |
481 | v << __ffs(clkdm->clktrctrl_mask), | |
5b74c676 | 482 | clkdm->pwrdm.ptr->prcm_offs, |
d459bfe0 PW |
483 | CM_CLKSTCTRL); |
484 | } | |
485 | ||
486 | /** | |
487 | * omap2_clkdm_deny_idle - disable hwsup idle transitions for clkdm | |
488 | * @clkdm: struct clockdomain * | |
489 | * | |
490 | * Prevent the hardware from automatically switching the clockdomain | |
491 | * into inactive or idle states. If the clockdomain has downstream | |
492 | * clocks enabled in the clock framework, wkdep/sleepdep | |
493 | * autodependencies are removed. No return value. | |
494 | */ | |
495 | void omap2_clkdm_deny_idle(struct clockdomain *clkdm) | |
496 | { | |
497 | u32 v; | |
498 | ||
499 | if (!clkdm) | |
500 | return; | |
501 | ||
502 | if (!(clkdm->flags & CLKDM_CAN_DISABLE_AUTO)) { | |
503 | pr_debug("clockdomain: automatic idle transitions cannot be " | |
504 | "disabled on %s\n", clkdm->name); | |
505 | return; | |
506 | } | |
507 | ||
508 | pr_debug("clockdomain: disabling automatic idle transitions for %s\n", | |
509 | clkdm->name); | |
510 | ||
511 | if (cpu_is_omap24xx()) | |
512 | v = OMAP24XX_CLKSTCTRL_DISABLE_AUTO; | |
513 | else if (cpu_is_omap34xx()) | |
514 | v = OMAP34XX_CLKSTCTRL_DISABLE_AUTO; | |
515 | else | |
516 | BUG(); | |
517 | ||
518 | cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, | |
519 | v << __ffs(clkdm->clktrctrl_mask), | |
5b74c676 | 520 | clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL); |
d459bfe0 PW |
521 | |
522 | if (atomic_read(&clkdm->usecount) > 0) | |
523 | _clkdm_del_autodeps(clkdm); | |
524 | } | |
525 | ||
526 | ||
527 | /* Clockdomain-to-clock framework interface code */ | |
528 | ||
529 | /** | |
530 | * omap2_clkdm_clk_enable - add an enabled downstream clock to this clkdm | |
531 | * @clkdm: struct clockdomain * | |
532 | * @clk: struct clk * of the enabled downstream clock | |
533 | * | |
534 | * Increment the usecount of this clockdomain 'clkdm' and ensure that | |
535 | * it is awake. Intended to be called by clk_enable() code. If the | |
536 | * clockdomain is in software-supervised idle mode, force the | |
537 | * clockdomain to wake. If the clockdomain is in hardware-supervised | |
538 | * idle mode, add clkdm-pwrdm autodependencies, to ensure that devices | |
539 | * in the clockdomain can be read from/written to by on-chip processors. | |
540 | * Returns -EINVAL if passed null pointers; returns 0 upon success or | |
541 | * if the clockdomain is in hwsup idle mode. | |
542 | */ | |
543 | int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk) | |
544 | { | |
545 | int v; | |
546 | ||
547 | /* | |
548 | * XXX Rewrite this code to maintain a list of enabled | |
549 | * downstream clocks for debugging purposes? | |
550 | */ | |
551 | ||
552 | if (!clkdm || !clk) | |
553 | return -EINVAL; | |
554 | ||
555 | if (atomic_inc_return(&clkdm->usecount) > 1) | |
556 | return 0; | |
557 | ||
558 | /* Clockdomain now has one enabled downstream clock */ | |
559 | ||
560 | pr_debug("clockdomain: clkdm %s: clk %s now enabled\n", clkdm->name, | |
561 | clk->name); | |
562 | ||
563 | v = omap2_clkdm_clktrctrl_read(clkdm); | |
564 | ||
565 | if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) || | |
566 | (cpu_is_omap24xx() && v == OMAP24XX_CLKSTCTRL_ENABLE_AUTO)) | |
567 | _clkdm_add_autodeps(clkdm); | |
568 | else | |
569 | omap2_clkdm_wakeup(clkdm); | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | /** | |
575 | * omap2_clkdm_clk_disable - remove an enabled downstream clock from this clkdm | |
576 | * @clkdm: struct clockdomain * | |
577 | * @clk: struct clk * of the disabled downstream clock | |
578 | * | |
579 | * Decrement the usecount of this clockdomain 'clkdm'. Intended to be | |
580 | * called by clk_disable() code. If the usecount goes to 0, put the | |
581 | * clockdomain to sleep (software-supervised mode) or remove the | |
582 | * clkdm-pwrdm autodependencies (hardware-supervised mode). Returns | |
583 | * -EINVAL if passed null pointers; -ERANGE if the clkdm usecount | |
584 | * underflows and debugging is enabled; or returns 0 upon success or | |
585 | * if the clockdomain is in hwsup idle mode. | |
586 | */ | |
587 | int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk) | |
588 | { | |
589 | int v; | |
590 | ||
591 | /* | |
592 | * XXX Rewrite this code to maintain a list of enabled | |
593 | * downstream clocks for debugging purposes? | |
594 | */ | |
595 | ||
596 | if (!clkdm || !clk) | |
597 | return -EINVAL; | |
598 | ||
599 | #ifdef DEBUG | |
600 | if (atomic_read(&clkdm->usecount) == 0) { | |
601 | WARN_ON(1); /* underflow */ | |
602 | return -ERANGE; | |
603 | } | |
604 | #endif | |
605 | ||
606 | if (atomic_dec_return(&clkdm->usecount) > 0) | |
607 | return 0; | |
608 | ||
609 | /* All downstream clocks of this clockdomain are now disabled */ | |
610 | ||
611 | pr_debug("clockdomain: clkdm %s: clk %s now disabled\n", clkdm->name, | |
612 | clk->name); | |
613 | ||
614 | v = omap2_clkdm_clktrctrl_read(clkdm); | |
615 | ||
616 | if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) || | |
617 | (cpu_is_omap24xx() && v == OMAP24XX_CLKSTCTRL_ENABLE_AUTO)) | |
618 | _clkdm_del_autodeps(clkdm); | |
619 | else | |
620 | omap2_clkdm_sleep(clkdm); | |
621 | ||
622 | return 0; | |
623 | } | |
624 |