2 * OMAP2/3/4 clockdomain framework functions
4 * Copyright (C) 2008-2010 Texas Instruments, Inc.
5 * Copyright (C) 2008-2010 Nokia Corporation
7 * Written by Paul Walmsley and Jouni Högander
8 * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
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.
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>
23 #include <linux/err.h>
27 #include <linux/bitops.h>
29 #include "prm2xxx_3xxx.h"
30 #include "prm-regbits-24xx.h"
31 #include "cm2xxx_3xxx.h"
32 #include "cm-regbits-24xx.h"
33 #include "cminst44xx.h"
36 #include <plat/clock.h>
37 #include "powerdomain.h"
38 #include "clockdomain.h"
39 #include <plat/prcm.h>
41 /* clkdm_list contains all registered struct clockdomains */
42 static LIST_HEAD(clkdm_list);
44 /* array of clockdomain deps to be added/removed when clkdm in hwsup mode */
45 static struct clkdm_autodep *autodeps;
48 /* Private functions */
50 static struct clockdomain *_clkdm_lookup(const char *name)
52 struct clockdomain *clkdm, *temp_clkdm;
59 list_for_each_entry(temp_clkdm, &clkdm_list, node) {
60 if (!strcmp(name, temp_clkdm->name)) {
70 * _clkdm_register - register a clockdomain
71 * @clkdm: struct clockdomain * to register
73 * Adds a clockdomain to the internal clockdomain list.
74 * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is
75 * already registered by the provided name, or 0 upon success.
77 static int _clkdm_register(struct clockdomain *clkdm)
79 struct powerdomain *pwrdm;
81 if (!clkdm || !clkdm->name)
84 if (!omap_chip_is(clkdm->omap_chip))
87 pwrdm = pwrdm_lookup(clkdm->pwrdm.name);
89 pr_err("clockdomain: %s: powerdomain %s does not exist\n",
90 clkdm->name, clkdm->pwrdm.name);
93 clkdm->pwrdm.ptr = pwrdm;
95 /* Verify that the clockdomain is not already registered */
96 if (_clkdm_lookup(clkdm->name))
99 list_add(&clkdm->node, &clkdm_list);
101 pwrdm_add_clkdm(pwrdm, clkdm);
103 pr_debug("clockdomain: registered %s\n", clkdm->name);
108 /* _clkdm_deps_lookup - look up the specified clockdomain in a clkdm list */
109 static struct clkdm_dep *_clkdm_deps_lookup(struct clockdomain *clkdm,
110 struct clkdm_dep *deps)
112 struct clkdm_dep *cd;
114 if (!clkdm || !deps || !omap_chip_is(clkdm->omap_chip))
115 return ERR_PTR(-EINVAL);
117 for (cd = deps; cd->clkdm_name; cd++) {
118 if (!omap_chip_is(cd->omap_chip))
121 if (!cd->clkdm && cd->clkdm_name)
122 cd->clkdm = _clkdm_lookup(cd->clkdm_name);
124 if (cd->clkdm == clkdm)
129 return ERR_PTR(-ENOENT);
135 * _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store
136 * @autodep: struct clkdm_autodep * to resolve
138 * Resolve autodep clockdomain names to clockdomain pointers via
139 * clkdm_lookup() and store the pointers in the autodep structure. An
140 * "autodep" is a clockdomain sleep/wakeup dependency that is
141 * automatically added and removed whenever clocks in the associated
142 * clockdomain are enabled or disabled (respectively) when the
143 * clockdomain is in hardware-supervised mode. Meant to be called
144 * once at clockdomain layer initialization, since these should remain
145 * fixed for a particular architecture. No return value.
147 * XXX autodeps are deprecated and should be removed at the earliest
150 static void _autodep_lookup(struct clkdm_autodep *autodep)
152 struct clockdomain *clkdm;
157 if (!omap_chip_is(autodep->omap_chip))
160 clkdm = clkdm_lookup(autodep->clkdm.name);
162 pr_err("clockdomain: autodeps: clockdomain %s does not exist\n",
163 autodep->clkdm.name);
164 clkdm = ERR_PTR(-ENOENT);
166 autodep->clkdm.ptr = clkdm;
170 * _clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable
171 * @clkdm: struct clockdomain *
173 * Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm'
174 * in hardware-supervised mode. Meant to be called from clock framework
175 * when a clock inside clockdomain 'clkdm' is enabled. No return value.
177 * XXX autodeps are deprecated and should be removed at the earliest
180 static void _clkdm_add_autodeps(struct clockdomain *clkdm)
182 struct clkdm_autodep *autodep;
187 for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
188 if (IS_ERR(autodep->clkdm.ptr))
191 if (!omap_chip_is(autodep->omap_chip))
194 pr_debug("clockdomain: adding %s sleepdep/wkdep for "
195 "clkdm %s\n", autodep->clkdm.ptr->name,
198 clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr);
199 clkdm_add_wkdep(clkdm, autodep->clkdm.ptr);
204 * _clkdm_add_autodeps - remove auto sleepdeps/wkdeps from clkdm
205 * @clkdm: struct clockdomain *
207 * Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm'
208 * in hardware-supervised mode. Meant to be called from clock framework
209 * when a clock inside clockdomain 'clkdm' is disabled. No return value.
211 * XXX autodeps are deprecated and should be removed at the earliest
214 static void _clkdm_del_autodeps(struct clockdomain *clkdm)
216 struct clkdm_autodep *autodep;
221 for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
222 if (IS_ERR(autodep->clkdm.ptr))
225 if (!omap_chip_is(autodep->omap_chip))
228 pr_debug("clockdomain: removing %s sleepdep/wkdep for "
229 "clkdm %s\n", autodep->clkdm.ptr->name,
232 clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr);
233 clkdm_del_wkdep(clkdm, autodep->clkdm.ptr);
238 * _enable_hwsup - place a clockdomain into hardware-supervised idle
239 * @clkdm: struct clockdomain *
241 * Place the clockdomain into hardware-supervised idle mode. No return
244 * XXX Should this return an error if the clockdomain does not support
245 * hardware-supervised idle mode?
247 static void _enable_hwsup(struct clockdomain *clkdm)
249 if (cpu_is_omap24xx())
250 omap2xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
251 clkdm->clktrctrl_mask);
252 else if (cpu_is_omap34xx())
253 omap3xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
254 clkdm->clktrctrl_mask);
255 else if (cpu_is_omap44xx())
256 return omap4_cminst_clkdm_enable_hwsup(clkdm->prcm_partition,
264 * _disable_hwsup - place a clockdomain into software-supervised idle
265 * @clkdm: struct clockdomain *
267 * Place the clockdomain @clkdm into software-supervised idle mode.
270 * XXX Should this return an error if the clockdomain does not support
271 * software-supervised idle mode?
273 static void _disable_hwsup(struct clockdomain *clkdm)
275 if (cpu_is_omap24xx())
276 omap2xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
277 clkdm->clktrctrl_mask);
278 else if (cpu_is_omap34xx())
279 omap3xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
280 clkdm->clktrctrl_mask);
281 else if (cpu_is_omap44xx())
282 return omap4_cminst_clkdm_disable_hwsup(clkdm->prcm_partition,
289 /* Public functions */
292 * clkdm_init - set up the clockdomain layer
293 * @clkdms: optional pointer to an array of clockdomains to register
294 * @init_autodeps: optional pointer to an array of autodeps to register
296 * Set up internal state. If a pointer to an array of clockdomains
297 * @clkdms was supplied, loop through the list of clockdomains,
298 * register all that are available on the current platform. Similarly,
299 * if a pointer to an array of clockdomain autodependencies
300 * @init_autodeps was provided, register those. No return value.
302 void clkdm_init(struct clockdomain **clkdms,
303 struct clkdm_autodep *init_autodeps)
305 struct clockdomain **c = NULL;
306 struct clockdomain *clkdm;
307 struct clkdm_autodep *autodep = NULL;
310 for (c = clkdms; *c; c++)
313 autodeps = init_autodeps;
315 for (autodep = autodeps; autodep->clkdm.ptr; autodep++)
316 _autodep_lookup(autodep);
319 * Put all clockdomains into software-supervised mode; PM code
320 * should later enable hardware-supervised mode as appropriate
322 list_for_each_entry(clkdm, &clkdm_list, node) {
323 if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
324 omap2_clkdm_wakeup(clkdm);
325 else if (clkdm->flags & CLKDM_CAN_DISABLE_AUTO)
326 omap2_clkdm_deny_idle(clkdm);
328 clkdm_clear_all_wkdeps(clkdm);
329 clkdm_clear_all_sleepdeps(clkdm);
334 * clkdm_lookup - look up a clockdomain by name, return a pointer
335 * @name: name of clockdomain
337 * Find a registered clockdomain by its name @name. Returns a pointer
338 * to the struct clockdomain if found, or NULL otherwise.
340 struct clockdomain *clkdm_lookup(const char *name)
342 struct clockdomain *clkdm, *temp_clkdm;
349 list_for_each_entry(temp_clkdm, &clkdm_list, node) {
350 if (!strcmp(name, temp_clkdm->name)) {
360 * clkdm_for_each - call function on each registered clockdomain
361 * @fn: callback function *
363 * Call the supplied function @fn for each registered clockdomain.
364 * The callback function @fn can return anything but 0 to bail
365 * out early from the iterator. The callback function is called with
366 * the clkdm_mutex held, so no clockdomain structure manipulation
367 * functions should be called from the callback, although hardware
368 * clockdomain control functions are fine. Returns the last return
369 * value of the callback function, which should be 0 for success or
370 * anything else to indicate failure; or -EINVAL if the function pointer
373 int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
376 struct clockdomain *clkdm;
382 list_for_each_entry(clkdm, &clkdm_list, node) {
383 ret = (*fn)(clkdm, user);
393 * clkdm_get_pwrdm - return a ptr to the pwrdm that this clkdm resides in
394 * @clkdm: struct clockdomain *
396 * Return a pointer to the struct powerdomain that the specified clockdomain
397 * @clkdm exists in, or returns NULL if @clkdm is NULL.
399 struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm)
404 return clkdm->pwrdm.ptr;
408 /* Hardware clockdomain control */
411 * clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1
412 * @clkdm1: wake this struct clockdomain * up (dependent)
413 * @clkdm2: when this struct clockdomain * wakes up (source)
415 * When the clockdomain represented by @clkdm2 wakes up, wake up
416 * @clkdm1. Implemented in hardware on the OMAP, this feature is
417 * designed to reduce wakeup latency of the dependent clockdomain @clkdm1.
418 * Returns -EINVAL if presented with invalid clockdomain pointers,
419 * -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon
422 int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
424 struct clkdm_dep *cd;
426 if (!clkdm1 || !clkdm2)
429 cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
431 pr_debug("clockdomain: hardware cannot set/clear wake up of "
432 "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
436 if (atomic_inc_return(&cd->wkdep_usecount) == 1) {
437 pr_debug("clockdomain: hardware will wake up %s when %s wakes "
438 "up\n", clkdm1->name, clkdm2->name);
440 omap2_prm_set_mod_reg_bits((1 << clkdm2->dep_bit),
441 clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
448 * clkdm_del_wkdep - remove a wakeup dependency from clkdm2 to clkdm1
449 * @clkdm1: wake this struct clockdomain * up (dependent)
450 * @clkdm2: when this struct clockdomain * wakes up (source)
452 * Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2
453 * wakes up. Returns -EINVAL if presented with invalid clockdomain
454 * pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or
457 int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
459 struct clkdm_dep *cd;
461 if (!clkdm1 || !clkdm2)
464 cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
466 pr_debug("clockdomain: hardware cannot set/clear wake up of "
467 "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
471 if (atomic_dec_return(&cd->wkdep_usecount) == 0) {
472 pr_debug("clockdomain: hardware will no longer wake up %s "
473 "after %s wakes up\n", clkdm1->name, clkdm2->name);
475 omap2_prm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
476 clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
483 * clkdm_read_wkdep - read wakeup dependency state from clkdm2 to clkdm1
484 * @clkdm1: wake this struct clockdomain * up (dependent)
485 * @clkdm2: when this struct clockdomain * wakes up (source)
487 * Return 1 if a hardware wakeup dependency exists wherein @clkdm1 will be
488 * awoken when @clkdm2 wakes up; 0 if dependency is not set; -EINVAL
489 * if either clockdomain pointer is invalid; or -ENOENT if the hardware
492 * REVISIT: Currently this function only represents software-controllable
493 * wakeup dependencies. Wakeup dependencies fixed in hardware are not
496 int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
498 struct clkdm_dep *cd;
500 if (!clkdm1 || !clkdm2)
503 cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
505 pr_debug("clockdomain: hardware cannot set/clear wake up of "
506 "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
510 /* XXX It's faster to return the atomic wkdep_usecount */
511 return omap2_prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP,
512 (1 << clkdm2->dep_bit));
516 * clkdm_clear_all_wkdeps - remove all wakeup dependencies from target clkdm
517 * @clkdm: struct clockdomain * to remove all wakeup dependencies from
519 * Remove all inter-clockdomain wakeup dependencies that could cause
520 * @clkdm to wake. Intended to be used during boot to initialize the
521 * PRCM to a known state, after all clockdomains are put into swsup idle
522 * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or
525 int clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
527 struct clkdm_dep *cd;
533 for (cd = clkdm->wkdep_srcs; cd && cd->clkdm_name; cd++) {
534 if (!omap_chip_is(cd->omap_chip))
537 if (!cd->clkdm && cd->clkdm_name)
538 cd->clkdm = _clkdm_lookup(cd->clkdm_name);
540 /* PRM accesses are slow, so minimize them */
541 mask |= 1 << cd->clkdm->dep_bit;
542 atomic_set(&cd->wkdep_usecount, 0);
545 omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs, PM_WKDEP);
551 * clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1
552 * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
553 * @clkdm2: when this struct clockdomain * is active (source)
555 * Prevent @clkdm1 from automatically going inactive (and then to
556 * retention or off) if @clkdm2 is active. Returns -EINVAL if
557 * presented with invalid clockdomain pointers or called on a machine
558 * that does not support software-configurable hardware sleep
559 * dependencies, -ENOENT if the specified dependency cannot be set in
560 * hardware, or 0 upon success.
562 int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
564 struct clkdm_dep *cd;
566 if (!cpu_is_omap34xx())
569 if (!clkdm1 || !clkdm2)
572 cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
574 pr_debug("clockdomain: hardware cannot set/clear sleep "
575 "dependency affecting %s from %s\n", clkdm1->name,
580 if (atomic_inc_return(&cd->sleepdep_usecount) == 1) {
581 pr_debug("clockdomain: will prevent %s from sleeping if %s "
582 "is active\n", clkdm1->name, clkdm2->name);
584 omap2_cm_set_mod_reg_bits((1 << clkdm2->dep_bit),
585 clkdm1->pwrdm.ptr->prcm_offs,
586 OMAP3430_CM_SLEEPDEP);
593 * clkdm_del_sleepdep - remove a sleep dependency from clkdm2 to clkdm1
594 * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
595 * @clkdm2: when this struct clockdomain * is active (source)
597 * Allow @clkdm1 to automatically go inactive (and then to retention or
598 * off), independent of the activity state of @clkdm2. Returns -EINVAL
599 * if presented with invalid clockdomain pointers or called on a machine
600 * that does not support software-configurable hardware sleep dependencies,
601 * -ENOENT if the specified dependency cannot be cleared in hardware, or
604 int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
606 struct clkdm_dep *cd;
608 if (!cpu_is_omap34xx())
611 if (!clkdm1 || !clkdm2)
614 cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
616 pr_debug("clockdomain: hardware cannot set/clear sleep "
617 "dependency affecting %s from %s\n", clkdm1->name,
622 if (atomic_dec_return(&cd->sleepdep_usecount) == 0) {
623 pr_debug("clockdomain: will no longer prevent %s from "
624 "sleeping if %s is active\n", clkdm1->name,
627 omap2_cm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
628 clkdm1->pwrdm.ptr->prcm_offs,
629 OMAP3430_CM_SLEEPDEP);
636 * clkdm_read_sleepdep - read sleep dependency state from clkdm2 to clkdm1
637 * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
638 * @clkdm2: when this struct clockdomain * is active (source)
640 * Return 1 if a hardware sleep dependency exists wherein @clkdm1 will
641 * not be allowed to automatically go inactive if @clkdm2 is active;
642 * 0 if @clkdm1's automatic power state inactivity transition is independent
643 * of @clkdm2's; -EINVAL if either clockdomain pointer is invalid or called
644 * on a machine that does not support software-configurable hardware sleep
645 * dependencies; or -ENOENT if the hardware is incapable.
647 * REVISIT: Currently this function only represents software-controllable
648 * sleep dependencies. Sleep dependencies fixed in hardware are not
651 int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
653 struct clkdm_dep *cd;
655 if (!cpu_is_omap34xx())
658 if (!clkdm1 || !clkdm2)
661 cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
663 pr_debug("clockdomain: hardware cannot set/clear sleep "
664 "dependency affecting %s from %s\n", clkdm1->name,
669 /* XXX It's faster to return the atomic sleepdep_usecount */
670 return omap2_prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs,
671 OMAP3430_CM_SLEEPDEP,
672 (1 << clkdm2->dep_bit));
676 * clkdm_clear_all_sleepdeps - remove all sleep dependencies from target clkdm
677 * @clkdm: struct clockdomain * to remove all sleep dependencies from
679 * Remove all inter-clockdomain sleep dependencies that could prevent
680 * @clkdm from idling. Intended to be used during boot to initialize the
681 * PRCM to a known state, after all clockdomains are put into swsup idle
682 * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or
685 int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm)
687 struct clkdm_dep *cd;
690 if (!cpu_is_omap34xx())
696 for (cd = clkdm->sleepdep_srcs; cd && cd->clkdm_name; cd++) {
697 if (!omap_chip_is(cd->omap_chip))
700 if (!cd->clkdm && cd->clkdm_name)
701 cd->clkdm = _clkdm_lookup(cd->clkdm_name);
703 /* PRM accesses are slow, so minimize them */
704 mask |= 1 << cd->clkdm->dep_bit;
705 atomic_set(&cd->sleepdep_usecount, 0);
708 omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,
709 OMAP3430_CM_SLEEPDEP);
715 * omap2_clkdm_sleep - force clockdomain sleep transition
716 * @clkdm: struct clockdomain *
718 * Instruct the CM to force a sleep transition on the specified
719 * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if
720 * clockdomain does not support software-initiated sleep; 0 upon
723 int omap2_clkdm_sleep(struct clockdomain *clkdm)
728 if (!(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) {
729 pr_debug("clockdomain: %s does not support forcing "
730 "sleep via software\n", clkdm->name);
734 pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name);
736 if (cpu_is_omap24xx()) {
738 omap2_cm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
739 clkdm->pwrdm.ptr->prcm_offs, OMAP2_PM_PWSTCTRL);
741 } else if (cpu_is_omap34xx()) {
743 omap3xxx_cm_clkdm_force_sleep(clkdm->pwrdm.ptr->prcm_offs,
744 clkdm->clktrctrl_mask);
746 } else if (cpu_is_omap44xx()) {
748 omap4_cminst_clkdm_force_sleep(clkdm->prcm_partition,
760 * omap2_clkdm_wakeup - force clockdomain wakeup transition
761 * @clkdm: struct clockdomain *
763 * Instruct the CM to force a wakeup transition on the specified
764 * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if the
765 * clockdomain does not support software-controlled wakeup; 0 upon
768 int omap2_clkdm_wakeup(struct clockdomain *clkdm)
773 if (!(clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)) {
774 pr_debug("clockdomain: %s does not support forcing "
775 "wakeup via software\n", clkdm->name);
779 pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name);
781 if (cpu_is_omap24xx()) {
783 omap2_cm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
784 clkdm->pwrdm.ptr->prcm_offs, OMAP2_PM_PWSTCTRL);
786 } else if (cpu_is_omap34xx()) {
788 omap3xxx_cm_clkdm_force_wakeup(clkdm->pwrdm.ptr->prcm_offs,
789 clkdm->clktrctrl_mask);
791 } else if (cpu_is_omap44xx()) {
793 omap4_cminst_clkdm_force_wakeup(clkdm->prcm_partition,
805 * omap2_clkdm_allow_idle - enable hwsup idle transitions for clkdm
806 * @clkdm: struct clockdomain *
808 * Allow the hardware to automatically switch the clockdomain @clkdm into
809 * active or idle states, as needed by downstream clocks. If the
810 * clockdomain has any downstream clocks enabled in the clock
811 * framework, wkdep/sleepdep autodependencies are added; this is so
812 * device drivers can read and write to the device. No return value.
814 void omap2_clkdm_allow_idle(struct clockdomain *clkdm)
819 if (!(clkdm->flags & CLKDM_CAN_ENABLE_AUTO)) {
820 pr_debug("clock: automatic idle transitions cannot be enabled "
821 "on clockdomain %s\n", clkdm->name);
825 pr_debug("clockdomain: enabling automatic idle transitions for %s\n",
829 * XXX This should be removed once TI adds wakeup/sleep
830 * dependency code and data for OMAP4.
832 if (cpu_is_omap44xx()) {
833 WARN_ONCE(1, "clockdomain: OMAP4 wakeup/sleep dependency "
834 "support is not yet implemented\n");
836 if (atomic_read(&clkdm->usecount) > 0)
837 _clkdm_add_autodeps(clkdm);
840 _enable_hwsup(clkdm);
842 pwrdm_clkdm_state_switch(clkdm);
846 * omap2_clkdm_deny_idle - disable hwsup idle transitions for clkdm
847 * @clkdm: struct clockdomain *
849 * Prevent the hardware from automatically switching the clockdomain
850 * @clkdm into inactive or idle states. If the clockdomain has
851 * downstream clocks enabled in the clock framework, wkdep/sleepdep
852 * autodependencies are removed. No return value.
854 void omap2_clkdm_deny_idle(struct clockdomain *clkdm)
859 if (!(clkdm->flags & CLKDM_CAN_DISABLE_AUTO)) {
860 pr_debug("clockdomain: automatic idle transitions cannot be "
861 "disabled on %s\n", clkdm->name);
865 pr_debug("clockdomain: disabling automatic idle transitions for %s\n",
868 _disable_hwsup(clkdm);
871 * XXX This should be removed once TI adds wakeup/sleep
872 * dependency code and data for OMAP4.
874 if (cpu_is_omap44xx()) {
875 WARN_ONCE(1, "clockdomain: OMAP4 wakeup/sleep dependency "
876 "support is not yet implemented\n");
878 if (atomic_read(&clkdm->usecount) > 0)
879 _clkdm_del_autodeps(clkdm);
884 /* Clockdomain-to-clock framework interface code */
887 * omap2_clkdm_clk_enable - add an enabled downstream clock to this clkdm
888 * @clkdm: struct clockdomain *
889 * @clk: struct clk * of the enabled downstream clock
891 * Increment the usecount of the clockdomain @clkdm and ensure that it
892 * is awake before @clk is enabled. Intended to be called by
893 * clk_enable() code. If the clockdomain is in software-supervised
894 * idle mode, force the clockdomain to wake. If the clockdomain is in
895 * hardware-supervised idle mode, add clkdm-pwrdm autodependencies, to
896 * ensure that devices in the clockdomain can be read from/written to
897 * by on-chip processors. Returns -EINVAL if passed null pointers;
898 * returns 0 upon success or if the clockdomain is in hwsup idle mode.
900 int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk)
905 * XXX Rewrite this code to maintain a list of enabled
906 * downstream clocks for debugging purposes?
912 if (atomic_inc_return(&clkdm->usecount) > 1)
915 /* Clockdomain now has one enabled downstream clock */
917 pr_debug("clockdomain: clkdm %s: clk %s now enabled\n", clkdm->name,
920 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
922 if (!clkdm->clktrctrl_mask)
925 hwsup = omap2_cm_is_clkdm_in_hwsup(clkdm->pwrdm.ptr->prcm_offs,
926 clkdm->clktrctrl_mask);
928 } else if (cpu_is_omap44xx()) {
930 hwsup = omap4_cminst_is_clkdm_in_hwsup(clkdm->prcm_partition,
937 /* Disable HW transitions when we are changing deps */
938 _disable_hwsup(clkdm);
939 _clkdm_add_autodeps(clkdm);
940 _enable_hwsup(clkdm);
942 omap2_clkdm_wakeup(clkdm);
945 pwrdm_wait_transition(clkdm->pwrdm.ptr);
946 pwrdm_clkdm_state_switch(clkdm);
952 * omap2_clkdm_clk_disable - remove an enabled downstream clock from this clkdm
953 * @clkdm: struct clockdomain *
954 * @clk: struct clk * of the disabled downstream clock
956 * Decrement the usecount of this clockdomain @clkdm when @clk is
957 * disabled. Intended to be called by clk_disable() code. If the
958 * clockdomain usecount goes to 0, put the clockdomain to sleep
959 * (software-supervised mode) or remove the clkdm autodependencies
960 * (hardware-supervised mode). Returns -EINVAL if passed null
961 * pointers; -ERANGE if the @clkdm usecount underflows and debugging
962 * is enabled; or returns 0 upon success or if the clockdomain is in
965 int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk)
970 * XXX Rewrite this code to maintain a list of enabled
971 * downstream clocks for debugging purposes?
978 if (atomic_read(&clkdm->usecount) == 0) {
979 WARN_ON(1); /* underflow */
984 if (atomic_dec_return(&clkdm->usecount) > 0)
987 /* All downstream clocks of this clockdomain are now disabled */
989 pr_debug("clockdomain: clkdm %s: clk %s now disabled\n", clkdm->name,
992 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
994 if (!clkdm->clktrctrl_mask)
997 hwsup = omap2_cm_is_clkdm_in_hwsup(clkdm->pwrdm.ptr->prcm_offs,
998 clkdm->clktrctrl_mask);
1000 } else if (cpu_is_omap44xx()) {
1002 hwsup = omap4_cminst_is_clkdm_in_hwsup(clkdm->prcm_partition,
1009 /* Disable HW transitions when we are changing deps */
1010 _disable_hwsup(clkdm);
1011 _clkdm_del_autodeps(clkdm);
1012 _enable_hwsup(clkdm);
1014 omap2_clkdm_sleep(clkdm);
1017 pwrdm_clkdm_state_switch(clkdm);