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/module.h>
17 #include <linux/kernel.h>
18 #include <linux/device.h>
19 #include <linux/list.h>
20 #include <linux/errno.h>
21 #include <linux/delay.h>
22 #include <linux/clk.h>
23 #include <linux/limits.h>
24 #include <linux/err.h>
28 #include <linux/bitops.h>
31 #include "prm-regbits-24xx.h"
34 #include <plat/clock.h>
35 #include <plat/powerdomain.h>
36 #include <plat/clockdomain.h>
37 #include <plat/prcm.h>
39 /* clkdm_list contains all registered struct clockdomains */
40 static LIST_HEAD(clkdm_list
);
42 /* array of clockdomain deps to be added/removed when clkdm in hwsup mode */
43 static struct clkdm_autodep
*autodeps
;
46 /* Private functions */
48 static struct clockdomain
*_clkdm_lookup(const char *name
)
50 struct clockdomain
*clkdm
, *temp_clkdm
;
57 list_for_each_entry(temp_clkdm
, &clkdm_list
, node
) {
58 if (!strcmp(name
, temp_clkdm
->name
)) {
68 * _clkdm_register - register a clockdomain
69 * @clkdm: struct clockdomain * to register
71 * Adds a clockdomain to the internal clockdomain list.
72 * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is
73 * already registered by the provided name, or 0 upon success.
75 static int _clkdm_register(struct clockdomain
*clkdm
)
77 struct powerdomain
*pwrdm
;
79 if (!clkdm
|| !clkdm
->name
)
82 if (!omap_chip_is(clkdm
->omap_chip
))
85 pwrdm
= pwrdm_lookup(clkdm
->pwrdm
.name
);
87 pr_err("clockdomain: %s: powerdomain %s does not exist\n",
88 clkdm
->name
, clkdm
->pwrdm
.name
);
91 clkdm
->pwrdm
.ptr
= pwrdm
;
93 /* Verify that the clockdomain is not already registered */
94 if (_clkdm_lookup(clkdm
->name
))
97 list_add(&clkdm
->node
, &clkdm_list
);
99 pwrdm_add_clkdm(pwrdm
, clkdm
);
101 pr_debug("clockdomain: registered %s\n", clkdm
->name
);
106 /* _clkdm_deps_lookup - look up the specified clockdomain in a clkdm list */
107 static struct clkdm_dep
*_clkdm_deps_lookup(struct clockdomain
*clkdm
,
108 struct clkdm_dep
*deps
)
110 struct clkdm_dep
*cd
;
112 if (!clkdm
|| !deps
|| !omap_chip_is(clkdm
->omap_chip
))
113 return ERR_PTR(-EINVAL
);
115 for (cd
= deps
; cd
->clkdm_name
; cd
++) {
116 if (!omap_chip_is(cd
->omap_chip
))
119 if (!cd
->clkdm
&& cd
->clkdm_name
)
120 cd
->clkdm
= _clkdm_lookup(cd
->clkdm_name
);
122 if (cd
->clkdm
== clkdm
)
127 return ERR_PTR(-ENOENT
);
133 * _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store
134 * @autodep: struct clkdm_autodep * to resolve
136 * Resolve autodep clockdomain names to clockdomain pointers via
137 * clkdm_lookup() and store the pointers in the autodep structure. An
138 * "autodep" is a clockdomain sleep/wakeup dependency that is
139 * automatically added and removed whenever clocks in the associated
140 * clockdomain are enabled or disabled (respectively) when the
141 * clockdomain is in hardware-supervised mode. Meant to be called
142 * once at clockdomain layer initialization, since these should remain
143 * fixed for a particular architecture. No return value.
145 static void _autodep_lookup(struct clkdm_autodep
*autodep
)
147 struct clockdomain
*clkdm
;
152 if (!omap_chip_is(autodep
->omap_chip
))
155 clkdm
= clkdm_lookup(autodep
->clkdm
.name
);
157 pr_err("clockdomain: autodeps: clockdomain %s does not exist\n",
158 autodep
->clkdm
.name
);
159 clkdm
= ERR_PTR(-ENOENT
);
161 autodep
->clkdm
.ptr
= clkdm
;
165 * _clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable
166 * @clkdm: struct clockdomain *
168 * Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm'
169 * in hardware-supervised mode. Meant to be called from clock framework
170 * when a clock inside clockdomain 'clkdm' is enabled. No return value.
172 static void _clkdm_add_autodeps(struct clockdomain
*clkdm
)
174 struct clkdm_autodep
*autodep
;
179 for (autodep
= autodeps
; autodep
->clkdm
.ptr
; autodep
++) {
180 if (IS_ERR(autodep
->clkdm
.ptr
))
183 if (!omap_chip_is(autodep
->omap_chip
))
186 pr_debug("clockdomain: adding %s sleepdep/wkdep for "
187 "clkdm %s\n", autodep
->clkdm
.ptr
->name
,
190 clkdm_add_sleepdep(clkdm
, autodep
->clkdm
.ptr
);
191 clkdm_add_wkdep(clkdm
, autodep
->clkdm
.ptr
);
196 * _clkdm_add_autodeps - remove auto sleepdeps/wkdeps from clkdm
197 * @clkdm: struct clockdomain *
199 * Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm'
200 * in hardware-supervised mode. Meant to be called from clock framework
201 * when a clock inside clockdomain 'clkdm' is disabled. No return value.
203 static void _clkdm_del_autodeps(struct clockdomain
*clkdm
)
205 struct clkdm_autodep
*autodep
;
210 for (autodep
= autodeps
; autodep
->clkdm
.ptr
; autodep
++) {
211 if (IS_ERR(autodep
->clkdm
.ptr
))
214 if (!omap_chip_is(autodep
->omap_chip
))
217 pr_debug("clockdomain: removing %s sleepdep/wkdep for "
218 "clkdm %s\n", autodep
->clkdm
.ptr
->name
,
221 clkdm_del_sleepdep(clkdm
, autodep
->clkdm
.ptr
);
222 clkdm_del_wkdep(clkdm
, autodep
->clkdm
.ptr
);
227 * _omap2_clkdm_set_hwsup - set the hwsup idle transition bit
228 * @clkdm: struct clockdomain *
229 * @enable: int 0 to disable, 1 to enable
231 * Internal helper for actually switching the bit that controls hwsup
232 * idle transitions for clkdm.
234 static void _omap2_clkdm_set_hwsup(struct clockdomain
*clkdm
, int enable
)
238 if (cpu_is_omap24xx()) {
240 bits
= OMAP24XX_CLKSTCTRL_ENABLE_AUTO
;
242 bits
= OMAP24XX_CLKSTCTRL_DISABLE_AUTO
;
243 } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
245 bits
= OMAP34XX_CLKSTCTRL_ENABLE_AUTO
;
247 bits
= OMAP34XX_CLKSTCTRL_DISABLE_AUTO
;
252 bits
= bits
<< __ffs(clkdm
->clktrctrl_mask
);
254 v
= __raw_readl(clkdm
->clkstctrl_reg
);
255 v
&= ~(clkdm
->clktrctrl_mask
);
257 __raw_writel(v
, clkdm
->clkstctrl_reg
);
261 /* Public functions */
264 * clkdm_init - set up the clockdomain layer
265 * @clkdms: optional pointer to an array of clockdomains to register
266 * @init_autodeps: optional pointer to an array of autodeps to register
268 * Set up internal state. If a pointer to an array of clockdomains
269 * @clkdms was supplied, loop through the list of clockdomains,
270 * register all that are available on the current platform. Similarly,
271 * if a pointer to an array of clockdomain autodependencies
272 * @init_autodeps was provided, register those. No return value.
274 void clkdm_init(struct clockdomain
**clkdms
,
275 struct clkdm_autodep
*init_autodeps
)
277 struct clockdomain
**c
= NULL
;
278 struct clockdomain
*clkdm
;
279 struct clkdm_autodep
*autodep
= NULL
;
282 for (c
= clkdms
; *c
; c
++)
285 autodeps
= init_autodeps
;
287 for (autodep
= autodeps
; autodep
->clkdm
.ptr
; autodep
++)
288 _autodep_lookup(autodep
);
291 * Put all clockdomains into software-supervised mode; PM code
292 * should later enable hardware-supervised mode as appropriate
294 list_for_each_entry(clkdm
, &clkdm_list
, node
) {
295 if (clkdm
->flags
& CLKDM_CAN_FORCE_WAKEUP
)
296 omap2_clkdm_wakeup(clkdm
);
297 else if (clkdm
->flags
& CLKDM_CAN_DISABLE_AUTO
)
298 omap2_clkdm_deny_idle(clkdm
);
300 clkdm_clear_all_wkdeps(clkdm
);
301 clkdm_clear_all_sleepdeps(clkdm
);
306 * clkdm_lookup - look up a clockdomain by name, return a pointer
307 * @name: name of clockdomain
309 * Find a registered clockdomain by its name @name. Returns a pointer
310 * to the struct clockdomain if found, or NULL otherwise.
312 struct clockdomain
*clkdm_lookup(const char *name
)
314 struct clockdomain
*clkdm
, *temp_clkdm
;
321 list_for_each_entry(temp_clkdm
, &clkdm_list
, node
) {
322 if (!strcmp(name
, temp_clkdm
->name
)) {
332 * clkdm_for_each - call function on each registered clockdomain
333 * @fn: callback function *
335 * Call the supplied function @fn for each registered clockdomain.
336 * The callback function @fn can return anything but 0 to bail
337 * out early from the iterator. The callback function is called with
338 * the clkdm_mutex held, so no clockdomain structure manipulation
339 * functions should be called from the callback, although hardware
340 * clockdomain control functions are fine. Returns the last return
341 * value of the callback function, which should be 0 for success or
342 * anything else to indicate failure; or -EINVAL if the function pointer
345 int clkdm_for_each(int (*fn
)(struct clockdomain
*clkdm
, void *user
),
348 struct clockdomain
*clkdm
;
354 list_for_each_entry(clkdm
, &clkdm_list
, node
) {
355 ret
= (*fn
)(clkdm
, user
);
365 * clkdm_get_pwrdm - return a ptr to the pwrdm that this clkdm resides in
366 * @clkdm: struct clockdomain *
368 * Return a pointer to the struct powerdomain that the specified clockdomain
369 * @clkdm exists in, or returns NULL if @clkdm is NULL.
371 struct powerdomain
*clkdm_get_pwrdm(struct clockdomain
*clkdm
)
376 return clkdm
->pwrdm
.ptr
;
380 /* Hardware clockdomain control */
383 * clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1
384 * @clkdm1: wake this struct clockdomain * up (dependent)
385 * @clkdm2: when this struct clockdomain * wakes up (source)
387 * When the clockdomain represented by @clkdm2 wakes up, wake up
388 * @clkdm1. Implemented in hardware on the OMAP, this feature is
389 * designed to reduce wakeup latency of the dependent clockdomain @clkdm1.
390 * Returns -EINVAL if presented with invalid clockdomain pointers,
391 * -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon
394 int clkdm_add_wkdep(struct clockdomain
*clkdm1
, struct clockdomain
*clkdm2
)
396 struct clkdm_dep
*cd
;
398 if (!clkdm1
|| !clkdm2
)
401 cd
= _clkdm_deps_lookup(clkdm2
, clkdm1
->wkdep_srcs
);
403 pr_debug("clockdomain: hardware cannot set/clear wake up of "
404 "%s when %s wakes up\n", clkdm1
->name
, clkdm2
->name
);
408 if (atomic_inc_return(&cd
->wkdep_usecount
) == 1) {
409 pr_debug("clockdomain: hardware will wake up %s when %s wakes "
410 "up\n", clkdm1
->name
, clkdm2
->name
);
412 prm_set_mod_reg_bits((1 << clkdm2
->dep_bit
),
413 clkdm1
->pwrdm
.ptr
->prcm_offs
, PM_WKDEP
);
420 * clkdm_del_wkdep - remove a wakeup dependency from clkdm2 to clkdm1
421 * @clkdm1: wake this struct clockdomain * up (dependent)
422 * @clkdm2: when this struct clockdomain * wakes up (source)
424 * Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2
425 * wakes up. Returns -EINVAL if presented with invalid clockdomain
426 * pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or
429 int clkdm_del_wkdep(struct clockdomain
*clkdm1
, struct clockdomain
*clkdm2
)
431 struct clkdm_dep
*cd
;
433 if (!clkdm1
|| !clkdm2
)
436 cd
= _clkdm_deps_lookup(clkdm2
, clkdm1
->wkdep_srcs
);
438 pr_debug("clockdomain: hardware cannot set/clear wake up of "
439 "%s when %s wakes up\n", clkdm1
->name
, clkdm2
->name
);
443 if (atomic_dec_return(&cd
->wkdep_usecount
) == 0) {
444 pr_debug("clockdomain: hardware will no longer wake up %s "
445 "after %s wakes up\n", clkdm1
->name
, clkdm2
->name
);
447 prm_clear_mod_reg_bits((1 << clkdm2
->dep_bit
),
448 clkdm1
->pwrdm
.ptr
->prcm_offs
, PM_WKDEP
);
455 * clkdm_read_wkdep - read wakeup dependency state from clkdm2 to clkdm1
456 * @clkdm1: wake this struct clockdomain * up (dependent)
457 * @clkdm2: when this struct clockdomain * wakes up (source)
459 * Return 1 if a hardware wakeup dependency exists wherein @clkdm1 will be
460 * awoken when @clkdm2 wakes up; 0 if dependency is not set; -EINVAL
461 * if either clockdomain pointer is invalid; or -ENOENT if the hardware
464 * REVISIT: Currently this function only represents software-controllable
465 * wakeup dependencies. Wakeup dependencies fixed in hardware are not
468 int clkdm_read_wkdep(struct clockdomain
*clkdm1
, struct clockdomain
*clkdm2
)
470 struct clkdm_dep
*cd
;
472 if (!clkdm1
|| !clkdm2
)
475 cd
= _clkdm_deps_lookup(clkdm2
, clkdm1
->wkdep_srcs
);
477 pr_debug("clockdomain: hardware cannot set/clear wake up of "
478 "%s when %s wakes up\n", clkdm1
->name
, clkdm2
->name
);
482 /* XXX It's faster to return the atomic wkdep_usecount */
483 return prm_read_mod_bits_shift(clkdm1
->pwrdm
.ptr
->prcm_offs
, PM_WKDEP
,
484 (1 << clkdm2
->dep_bit
));
488 * clkdm_clear_all_wkdeps - remove all wakeup dependencies from target clkdm
489 * @clkdm: struct clockdomain * to remove all wakeup dependencies from
491 * Remove all inter-clockdomain wakeup dependencies that could cause
492 * @clkdm to wake. Intended to be used during boot to initialize the
493 * PRCM to a known state, after all clockdomains are put into swsup idle
494 * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or
497 int clkdm_clear_all_wkdeps(struct clockdomain
*clkdm
)
499 struct clkdm_dep
*cd
;
505 for (cd
= clkdm
->wkdep_srcs
; cd
&& cd
->clkdm_name
; cd
++) {
506 if (!omap_chip_is(cd
->omap_chip
))
509 if (!cd
->clkdm
&& cd
->clkdm_name
)
510 cd
->clkdm
= _clkdm_lookup(cd
->clkdm_name
);
512 /* PRM accesses are slow, so minimize them */
513 mask
|= 1 << cd
->clkdm
->dep_bit
;
514 atomic_set(&cd
->wkdep_usecount
, 0);
517 prm_clear_mod_reg_bits(mask
, clkdm
->pwrdm
.ptr
->prcm_offs
, PM_WKDEP
);
523 * clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1
524 * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
525 * @clkdm2: when this struct clockdomain * is active (source)
527 * Prevent @clkdm1 from automatically going inactive (and then to
528 * retention or off) if @clkdm2 is active. Returns -EINVAL if
529 * presented with invalid clockdomain pointers or called on a machine
530 * that does not support software-configurable hardware sleep
531 * dependencies, -ENOENT if the specified dependency cannot be set in
532 * hardware, or 0 upon success.
534 int clkdm_add_sleepdep(struct clockdomain
*clkdm1
, struct clockdomain
*clkdm2
)
536 struct clkdm_dep
*cd
;
538 if (!cpu_is_omap34xx())
541 if (!clkdm1
|| !clkdm2
)
544 cd
= _clkdm_deps_lookup(clkdm2
, clkdm1
->sleepdep_srcs
);
546 pr_debug("clockdomain: hardware cannot set/clear sleep "
547 "dependency affecting %s from %s\n", clkdm1
->name
,
552 if (atomic_inc_return(&cd
->sleepdep_usecount
) == 1) {
553 pr_debug("clockdomain: will prevent %s from sleeping if %s "
554 "is active\n", clkdm1
->name
, clkdm2
->name
);
556 cm_set_mod_reg_bits((1 << clkdm2
->dep_bit
),
557 clkdm1
->pwrdm
.ptr
->prcm_offs
,
558 OMAP3430_CM_SLEEPDEP
);
565 * clkdm_del_sleepdep - remove a sleep dependency from clkdm2 to clkdm1
566 * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
567 * @clkdm2: when this struct clockdomain * is active (source)
569 * Allow @clkdm1 to automatically go inactive (and then to retention or
570 * off), independent of the activity state of @clkdm2. Returns -EINVAL
571 * if presented with invalid clockdomain pointers or called on a machine
572 * that does not support software-configurable hardware sleep dependencies,
573 * -ENOENT if the specified dependency cannot be cleared in hardware, or
576 int clkdm_del_sleepdep(struct clockdomain
*clkdm1
, struct clockdomain
*clkdm2
)
578 struct clkdm_dep
*cd
;
580 if (!cpu_is_omap34xx())
583 if (!clkdm1
|| !clkdm2
)
586 cd
= _clkdm_deps_lookup(clkdm2
, clkdm1
->sleepdep_srcs
);
588 pr_debug("clockdomain: hardware cannot set/clear sleep "
589 "dependency affecting %s from %s\n", clkdm1
->name
,
594 if (atomic_dec_return(&cd
->sleepdep_usecount
) == 0) {
595 pr_debug("clockdomain: will no longer prevent %s from "
596 "sleeping if %s is active\n", clkdm1
->name
,
599 cm_clear_mod_reg_bits((1 << clkdm2
->dep_bit
),
600 clkdm1
->pwrdm
.ptr
->prcm_offs
,
601 OMAP3430_CM_SLEEPDEP
);
608 * clkdm_read_sleepdep - read sleep dependency state from clkdm2 to clkdm1
609 * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
610 * @clkdm2: when this struct clockdomain * is active (source)
612 * Return 1 if a hardware sleep dependency exists wherein @clkdm1 will
613 * not be allowed to automatically go inactive if @clkdm2 is active;
614 * 0 if @clkdm1's automatic power state inactivity transition is independent
615 * of @clkdm2's; -EINVAL if either clockdomain pointer is invalid or called
616 * on a machine that does not support software-configurable hardware sleep
617 * dependencies; or -ENOENT if the hardware is incapable.
619 * REVISIT: Currently this function only represents software-controllable
620 * sleep dependencies. Sleep dependencies fixed in hardware are not
623 int clkdm_read_sleepdep(struct clockdomain
*clkdm1
, struct clockdomain
*clkdm2
)
625 struct clkdm_dep
*cd
;
627 if (!cpu_is_omap34xx())
630 if (!clkdm1
|| !clkdm2
)
633 cd
= _clkdm_deps_lookup(clkdm2
, clkdm1
->sleepdep_srcs
);
635 pr_debug("clockdomain: hardware cannot set/clear sleep "
636 "dependency affecting %s from %s\n", clkdm1
->name
,
641 /* XXX It's faster to return the atomic sleepdep_usecount */
642 return prm_read_mod_bits_shift(clkdm1
->pwrdm
.ptr
->prcm_offs
,
643 OMAP3430_CM_SLEEPDEP
,
644 (1 << clkdm2
->dep_bit
));
648 * clkdm_clear_all_sleepdeps - remove all sleep dependencies from target clkdm
649 * @clkdm: struct clockdomain * to remove all sleep dependencies from
651 * Remove all inter-clockdomain sleep dependencies that could prevent
652 * @clkdm from idling. Intended to be used during boot to initialize the
653 * PRCM to a known state, after all clockdomains are put into swsup idle
654 * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or
657 int clkdm_clear_all_sleepdeps(struct clockdomain
*clkdm
)
659 struct clkdm_dep
*cd
;
662 if (!cpu_is_omap34xx())
668 for (cd
= clkdm
->sleepdep_srcs
; cd
&& cd
->clkdm_name
; cd
++) {
669 if (!omap_chip_is(cd
->omap_chip
))
672 if (!cd
->clkdm
&& cd
->clkdm_name
)
673 cd
->clkdm
= _clkdm_lookup(cd
->clkdm_name
);
675 /* PRM accesses are slow, so minimize them */
676 mask
|= 1 << cd
->clkdm
->dep_bit
;
677 atomic_set(&cd
->sleepdep_usecount
, 0);
680 prm_clear_mod_reg_bits(mask
, clkdm
->pwrdm
.ptr
->prcm_offs
,
681 OMAP3430_CM_SLEEPDEP
);
687 * omap2_clkdm_clktrctrl_read - read the clkdm's current state transition mode
688 * @clkdm: struct clkdm * of a clockdomain
690 * Return the clockdomain @clkdm current state transition mode from the
691 * corresponding domain CM_CLKSTCTRL register. Returns -EINVAL if @clkdm
692 * is NULL or the current mode upon success.
694 static int omap2_clkdm_clktrctrl_read(struct clockdomain
*clkdm
)
701 v
= __raw_readl(clkdm
->clkstctrl_reg
);
702 v
&= clkdm
->clktrctrl_mask
;
703 v
>>= __ffs(clkdm
->clktrctrl_mask
);
709 * omap2_clkdm_sleep - force clockdomain sleep transition
710 * @clkdm: struct clockdomain *
712 * Instruct the CM to force a sleep transition on the specified
713 * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if
714 * clockdomain does not support software-initiated sleep; 0 upon
717 int omap2_clkdm_sleep(struct clockdomain
*clkdm
)
722 if (!(clkdm
->flags
& CLKDM_CAN_FORCE_SLEEP
)) {
723 pr_debug("clockdomain: %s does not support forcing "
724 "sleep via software\n", clkdm
->name
);
728 pr_debug("clockdomain: forcing sleep on %s\n", clkdm
->name
);
730 if (cpu_is_omap24xx()) {
732 cm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK
,
733 clkdm
->pwrdm
.ptr
->prcm_offs
, OMAP2_PM_PWSTCTRL
);
735 } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
737 u32 bits
= (OMAP34XX_CLKSTCTRL_FORCE_SLEEP
<<
738 __ffs(clkdm
->clktrctrl_mask
));
740 u32 v
= __raw_readl(clkdm
->clkstctrl_reg
);
741 v
&= ~(clkdm
->clktrctrl_mask
);
743 __raw_writel(v
, clkdm
->clkstctrl_reg
);
753 * omap2_clkdm_wakeup - force clockdomain wakeup transition
754 * @clkdm: struct clockdomain *
756 * Instruct the CM to force a wakeup transition on the specified
757 * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if the
758 * clockdomain does not support software-controlled wakeup; 0 upon
761 int omap2_clkdm_wakeup(struct clockdomain
*clkdm
)
766 if (!(clkdm
->flags
& CLKDM_CAN_FORCE_WAKEUP
)) {
767 pr_debug("clockdomain: %s does not support forcing "
768 "wakeup via software\n", clkdm
->name
);
772 pr_debug("clockdomain: forcing wakeup on %s\n", clkdm
->name
);
774 if (cpu_is_omap24xx()) {
776 cm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK
,
777 clkdm
->pwrdm
.ptr
->prcm_offs
, OMAP2_PM_PWSTCTRL
);
779 } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
781 u32 bits
= (OMAP34XX_CLKSTCTRL_FORCE_WAKEUP
<<
782 __ffs(clkdm
->clktrctrl_mask
));
784 u32 v
= __raw_readl(clkdm
->clkstctrl_reg
);
785 v
&= ~(clkdm
->clktrctrl_mask
);
787 __raw_writel(v
, clkdm
->clkstctrl_reg
);
797 * omap2_clkdm_allow_idle - enable hwsup idle transitions for clkdm
798 * @clkdm: struct clockdomain *
800 * Allow the hardware to automatically switch the clockdomain @clkdm into
801 * active or idle states, as needed by downstream clocks. If the
802 * clockdomain has any downstream clocks enabled in the clock
803 * framework, wkdep/sleepdep autodependencies are added; this is so
804 * device drivers can read and write to the device. No return value.
806 void omap2_clkdm_allow_idle(struct clockdomain
*clkdm
)
811 if (!(clkdm
->flags
& CLKDM_CAN_ENABLE_AUTO
)) {
812 pr_debug("clock: automatic idle transitions cannot be enabled "
813 "on clockdomain %s\n", clkdm
->name
);
817 pr_debug("clockdomain: enabling automatic idle transitions for %s\n",
821 * XXX This should be removed once TI adds wakeup/sleep
822 * dependency code and data for OMAP4.
824 if (cpu_is_omap44xx()) {
825 WARN_ONCE(1, "clockdomain: OMAP4 wakeup/sleep dependency "
826 "support is not yet implemented\n");
828 if (atomic_read(&clkdm
->usecount
) > 0)
829 _clkdm_add_autodeps(clkdm
);
832 _omap2_clkdm_set_hwsup(clkdm
, 1);
834 pwrdm_clkdm_state_switch(clkdm
);
838 * omap2_clkdm_deny_idle - disable hwsup idle transitions for clkdm
839 * @clkdm: struct clockdomain *
841 * Prevent the hardware from automatically switching the clockdomain
842 * @clkdm into inactive or idle states. If the clockdomain has
843 * downstream clocks enabled in the clock framework, wkdep/sleepdep
844 * autodependencies are removed. No return value.
846 void omap2_clkdm_deny_idle(struct clockdomain
*clkdm
)
851 if (!(clkdm
->flags
& CLKDM_CAN_DISABLE_AUTO
)) {
852 pr_debug("clockdomain: automatic idle transitions cannot be "
853 "disabled on %s\n", clkdm
->name
);
857 pr_debug("clockdomain: disabling automatic idle transitions for %s\n",
860 _omap2_clkdm_set_hwsup(clkdm
, 0);
863 * XXX This should be removed once TI adds wakeup/sleep
864 * dependency code and data for OMAP4.
866 if (cpu_is_omap44xx()) {
867 WARN_ONCE(1, "clockdomain: OMAP4 wakeup/sleep dependency "
868 "support is not yet implemented\n");
870 if (atomic_read(&clkdm
->usecount
) > 0)
871 _clkdm_del_autodeps(clkdm
);
876 /* Clockdomain-to-clock framework interface code */
879 * omap2_clkdm_clk_enable - add an enabled downstream clock to this clkdm
880 * @clkdm: struct clockdomain *
881 * @clk: struct clk * of the enabled downstream clock
883 * Increment the usecount of the clockdomain @clkdm and ensure that it
884 * is awake before @clk is enabled. Intended to be called by
885 * clk_enable() code. If the clockdomain is in software-supervised
886 * idle mode, force the clockdomain to wake. If the clockdomain is in
887 * hardware-supervised idle mode, add clkdm-pwrdm autodependencies, to
888 * ensure that devices in the clockdomain can be read from/written to
889 * by on-chip processors. Returns -EINVAL if passed null pointers;
890 * returns 0 upon success or if the clockdomain is in hwsup idle mode.
892 int omap2_clkdm_clk_enable(struct clockdomain
*clkdm
, struct clk
*clk
)
897 * XXX Rewrite this code to maintain a list of enabled
898 * downstream clocks for debugging purposes?
904 if (atomic_inc_return(&clkdm
->usecount
) > 1)
907 /* Clockdomain now has one enabled downstream clock */
909 pr_debug("clockdomain: clkdm %s: clk %s now enabled\n", clkdm
->name
,
912 if (!clkdm
->clkstctrl_reg
)
915 v
= omap2_clkdm_clktrctrl_read(clkdm
);
917 if ((cpu_is_omap34xx() && v
== OMAP34XX_CLKSTCTRL_ENABLE_AUTO
) ||
918 (cpu_is_omap24xx() && v
== OMAP24XX_CLKSTCTRL_ENABLE_AUTO
)) {
919 /* Disable HW transitions when we are changing deps */
920 _omap2_clkdm_set_hwsup(clkdm
, 0);
921 _clkdm_add_autodeps(clkdm
);
922 _omap2_clkdm_set_hwsup(clkdm
, 1);
924 omap2_clkdm_wakeup(clkdm
);
927 pwrdm_wait_transition(clkdm
->pwrdm
.ptr
);
928 pwrdm_clkdm_state_switch(clkdm
);
934 * omap2_clkdm_clk_disable - remove an enabled downstream clock from this clkdm
935 * @clkdm: struct clockdomain *
936 * @clk: struct clk * of the disabled downstream clock
938 * Decrement the usecount of this clockdomain @clkdm when @clk is
939 * disabled. Intended to be called by clk_disable() code. If the
940 * clockdomain usecount goes to 0, put the clockdomain to sleep
941 * (software-supervised mode) or remove the clkdm autodependencies
942 * (hardware-supervised mode). Returns -EINVAL if passed null
943 * pointers; -ERANGE if the @clkdm usecount underflows and debugging
944 * is enabled; or returns 0 upon success or if the clockdomain is in
947 int omap2_clkdm_clk_disable(struct clockdomain
*clkdm
, struct clk
*clk
)
952 * XXX Rewrite this code to maintain a list of enabled
953 * downstream clocks for debugging purposes?
960 if (atomic_read(&clkdm
->usecount
) == 0) {
961 WARN_ON(1); /* underflow */
966 if (atomic_dec_return(&clkdm
->usecount
) > 0)
969 /* All downstream clocks of this clockdomain are now disabled */
971 pr_debug("clockdomain: clkdm %s: clk %s now disabled\n", clkdm
->name
,
974 if (!clkdm
->clkstctrl_reg
)
977 v
= omap2_clkdm_clktrctrl_read(clkdm
);
979 if ((cpu_is_omap34xx() && v
== OMAP34XX_CLKSTCTRL_ENABLE_AUTO
) ||
980 (cpu_is_omap24xx() && v
== OMAP24XX_CLKSTCTRL_ENABLE_AUTO
)) {
981 /* Disable HW transitions when we are changing deps */
982 _omap2_clkdm_set_hwsup(clkdm
, 0);
983 _clkdm_del_autodeps(clkdm
);
984 _omap2_clkdm_set_hwsup(clkdm
, 1);
986 omap2_clkdm_sleep(clkdm
);
989 pwrdm_clkdm_state_switch(clkdm
);