/*
- * OMAP2/3 clockdomain framework functions
+ * OMAP2/3/4 clockdomain framework functions
*
- * Copyright (C) 2008 Texas Instruments, Inc.
- * Copyright (C) 2008 Nokia Corporation
+ * Copyright (C) 2008-2011 Texas Instruments, Inc.
+ * Copyright (C) 2008-2011 Nokia Corporation
*
* Written by Paul Walmsley and Jouni Högander
+ * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
-#ifdef CONFIG_OMAP_DEBUG_CLOCKDOMAIN
-# define DEBUG
-#endif
+#undef DEBUG
-#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/errno.h>
+#include <linux/string.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/limits.h>
+#include <linux/err.h>
#include <linux/io.h>
#include <linux/bitops.h>
-#include <mach/clock.h>
-
-#include "prm.h"
-#include "prm-regbits-24xx.h"
-#include "cm.h"
-
-#include <mach/powerdomain.h>
-#include <mach/clockdomain.h>
+#include <plat/clock.h>
+#include "clockdomain.h"
/* clkdm_list contains all registered struct clockdomains */
static LIST_HEAD(clkdm_list);
-/* clkdm_mutex protects clkdm_list add and del ops */
-static DEFINE_MUTEX(clkdm_mutex);
-
-/* array of powerdomain deps to be added/removed when clkdm in hwsup mode */
-static struct clkdm_pwrdm_autodep *autodeps;
+/* array of clockdomain deps to be added/removed when clkdm in hwsup mode */
+static struct clkdm_autodep *autodeps;
+static struct clkdm_ops *arch_clkdm;
/* Private functions */
+static struct clockdomain *_clkdm_lookup(const char *name)
+{
+ struct clockdomain *clkdm, *temp_clkdm;
+
+ if (!name)
+ return NULL;
+
+ clkdm = NULL;
+
+ list_for_each_entry(temp_clkdm, &clkdm_list, node) {
+ if (!strcmp(name, temp_clkdm->name)) {
+ clkdm = temp_clkdm;
+ break;
+ }
+ }
+
+ return clkdm;
+}
+
+/**
+ * _clkdm_register - register a clockdomain
+ * @clkdm: struct clockdomain * to register
+ *
+ * Adds a clockdomain to the internal clockdomain list.
+ * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is
+ * already registered by the provided name, or 0 upon success.
+ */
+static int _clkdm_register(struct clockdomain *clkdm)
+{
+ struct powerdomain *pwrdm;
+
+ if (!clkdm || !clkdm->name)
+ return -EINVAL;
+
+ pwrdm = pwrdm_lookup(clkdm->pwrdm.name);
+ if (!pwrdm) {
+ pr_err("clockdomain: %s: powerdomain %s does not exist\n",
+ clkdm->name, clkdm->pwrdm.name);
+ return -EINVAL;
+ }
+ clkdm->pwrdm.ptr = pwrdm;
+
+ /* Verify that the clockdomain is not already registered */
+ if (_clkdm_lookup(clkdm->name))
+ return -EEXIST;
+
+ list_add(&clkdm->node, &clkdm_list);
+
+ pwrdm_add_clkdm(pwrdm, clkdm);
+
+ spin_lock_init(&clkdm->lock);
+
+ pr_debug("clockdomain: registered %s\n", clkdm->name);
+
+ return 0;
+}
+
+/* _clkdm_deps_lookup - look up the specified clockdomain in a clkdm list */
+static struct clkdm_dep *_clkdm_deps_lookup(struct clockdomain *clkdm,
+ struct clkdm_dep *deps)
+{
+ struct clkdm_dep *cd;
+
+ if (!clkdm || !deps)
+ return ERR_PTR(-EINVAL);
+
+ for (cd = deps; cd->clkdm_name; cd++) {
+ if (!cd->clkdm && cd->clkdm_name)
+ cd->clkdm = _clkdm_lookup(cd->clkdm_name);
+
+ if (cd->clkdm == clkdm)
+ break;
+ }
+
+ if (!cd->clkdm_name)
+ return ERR_PTR(-ENOENT);
+
+ return cd;
+}
+
/*
- * _autodep_lookup - resolve autodep pwrdm names to pwrdm pointers; store
- * @autodep: struct clkdm_pwrdm_autodep * to resolve
+ * _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store
+ * @autodep: struct clkdm_autodep * to resolve
*
- * Resolve autodep powerdomain names to powerdomain pointers via
- * pwrdm_lookup() and store the pointers in the autodep structure. An
- * "autodep" is a powerdomain sleep/wakeup dependency that is
+ * Resolve autodep clockdomain names to clockdomain pointers via
+ * clkdm_lookup() and store the pointers in the autodep structure. An
+ * "autodep" is a clockdomain sleep/wakeup dependency that is
* automatically added and removed whenever clocks in the associated
* clockdomain are enabled or disabled (respectively) when the
* clockdomain is in hardware-supervised mode. Meant to be called
* once at clockdomain layer initialization, since these should remain
* fixed for a particular architecture. No return value.
+ *
+ * XXX autodeps are deprecated and should be removed at the earliest
+ * opportunity
*/
-static void _autodep_lookup(struct clkdm_pwrdm_autodep *autodep)
+static void _autodep_lookup(struct clkdm_autodep *autodep)
{
- struct powerdomain *pwrdm;
+ struct clockdomain *clkdm;
if (!autodep)
return;
- if (!omap_chip_is(autodep->omap_chip))
- return;
-
- pwrdm = pwrdm_lookup(autodep->pwrdm_name);
- if (!pwrdm) {
- pr_debug("clockdomain: _autodep_lookup: powerdomain %s "
- "does not exist\n", autodep->pwrdm_name);
- WARN_ON(1);
- return;
+ clkdm = clkdm_lookup(autodep->clkdm.name);
+ if (!clkdm) {
+ pr_err("clockdomain: autodeps: clockdomain %s does not exist\n",
+ autodep->clkdm.name);
+ clkdm = ERR_PTR(-ENOENT);
}
- autodep->pwrdm = pwrdm;
-
- return;
+ autodep->clkdm.ptr = clkdm;
}
/*
* Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm'
* in hardware-supervised mode. Meant to be called from clock framework
* when a clock inside clockdomain 'clkdm' is enabled. No return value.
+ *
+ * XXX autodeps are deprecated and should be removed at the earliest
+ * opportunity
*/
-static void _clkdm_add_autodeps(struct clockdomain *clkdm)
+void _clkdm_add_autodeps(struct clockdomain *clkdm)
{
- struct clkdm_pwrdm_autodep *autodep;
+ struct clkdm_autodep *autodep;
- for (autodep = autodeps; autodep->pwrdm_name; autodep++) {
- if (!autodep->pwrdm)
+ if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS)
+ return;
+
+ for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
+ if (IS_ERR(autodep->clkdm.ptr))
continue;
pr_debug("clockdomain: adding %s sleepdep/wkdep for "
- "pwrdm %s\n", autodep->pwrdm_name,
- clkdm->pwrdm->name);
+ "clkdm %s\n", autodep->clkdm.ptr->name,
+ clkdm->name);
- pwrdm_add_sleepdep(clkdm->pwrdm, autodep->pwrdm);
- pwrdm_add_wkdep(clkdm->pwrdm, autodep->pwrdm);
+ clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr);
+ clkdm_add_wkdep(clkdm, autodep->clkdm.ptr);
}
}
* Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm'
* in hardware-supervised mode. Meant to be called from clock framework
* when a clock inside clockdomain 'clkdm' is disabled. No return value.
+ *
+ * XXX autodeps are deprecated and should be removed at the earliest
+ * opportunity
*/
-static void _clkdm_del_autodeps(struct clockdomain *clkdm)
+void _clkdm_del_autodeps(struct clockdomain *clkdm)
{
- struct clkdm_pwrdm_autodep *autodep;
+ struct clkdm_autodep *autodep;
- for (autodep = autodeps; autodep->pwrdm_name; autodep++) {
- if (!autodep->pwrdm)
+ if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS)
+ return;
+
+ for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
+ if (IS_ERR(autodep->clkdm.ptr))
continue;
pr_debug("clockdomain: removing %s sleepdep/wkdep for "
- "pwrdm %s\n", autodep->pwrdm_name,
- clkdm->pwrdm->name);
+ "clkdm %s\n", autodep->clkdm.ptr->name,
+ clkdm->name);
- pwrdm_del_sleepdep(clkdm->pwrdm, autodep->pwrdm);
- pwrdm_del_wkdep(clkdm->pwrdm, autodep->pwrdm);
+ clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr);
+ clkdm_del_wkdep(clkdm, autodep->clkdm.ptr);
}
}
-
-static struct clockdomain *_clkdm_lookup(const char *name)
+/**
+ * _resolve_clkdm_deps() - resolve clkdm_names in @clkdm_deps to clkdms
+ * @clkdm: clockdomain that we are resolving dependencies for
+ * @clkdm_deps: ptr to array of struct clkdm_deps to resolve
+ *
+ * Iterates through @clkdm_deps, looking up the struct clockdomain named by
+ * clkdm_name and storing the clockdomain pointer in the struct clkdm_dep.
+ * No return value.
+ */
+static void _resolve_clkdm_deps(struct clockdomain *clkdm,
+ struct clkdm_dep *clkdm_deps)
{
- struct clockdomain *clkdm, *temp_clkdm;
-
- if (!name)
- return NULL;
+ struct clkdm_dep *cd;
- clkdm = NULL;
+ for (cd = clkdm_deps; cd && cd->clkdm_name; cd++) {
+ if (cd->clkdm)
+ continue;
+ cd->clkdm = _clkdm_lookup(cd->clkdm_name);
- list_for_each_entry(temp_clkdm, &clkdm_list, node) {
- if (!strcmp(name, temp_clkdm->name)) {
- clkdm = temp_clkdm;
- break;
- }
+ WARN(!cd->clkdm, "clockdomain: %s: could not find clkdm %s while resolving dependencies - should never happen",
+ clkdm->name, cd->clkdm_name);
}
-
- return clkdm;
}
-
/* Public functions */
/**
- * clkdm_init - set up the clockdomain layer
- * @clkdms: optional pointer to an array of clockdomains to register
- * @init_autodeps: optional pointer to an array of autodeps to register
- *
- * Set up internal state. If a pointer to an array of clockdomains
- * was supplied, loop through the list of clockdomains, register all
- * that are available on the current platform. Similarly, if a
- * pointer to an array of clockdomain-powerdomain autodependencies was
- * provided, register those. No return value.
+ * clkdm_register_platform_funcs - register clockdomain implementation fns
+ * @co: func pointers for arch specific implementations
+ *
+ * Register the list of function pointers used to implement the
+ * clockdomain functions on different OMAP SoCs. Should be called
+ * before any other clkdm_register*() function. Returns -EINVAL if
+ * @co is null, -EEXIST if platform functions have already been
+ * registered, or 0 upon success.
*/
-void clkdm_init(struct clockdomain **clkdms,
- struct clkdm_pwrdm_autodep *init_autodeps)
+int clkdm_register_platform_funcs(struct clkdm_ops *co)
{
- struct clockdomain **c = NULL;
- struct clkdm_pwrdm_autodep *autodep = NULL;
+ if (!co)
+ return -EINVAL;
- if (clkdms)
- for (c = clkdms; *c; c++)
- clkdm_register(*c);
+ if (arch_clkdm)
+ return -EEXIST;
- autodeps = init_autodeps;
- if (autodeps)
- for (autodep = autodeps; autodep->pwrdm_name; autodep++)
- _autodep_lookup(autodep);
-}
+ arch_clkdm = co;
+
+ return 0;
+};
/**
- * clkdm_register - register a clockdomain
- * @clkdm: struct clockdomain * to register
+ * clkdm_register_clkdms - register SoC clockdomains
+ * @cs: pointer to an array of struct clockdomain to register
*
- * Adds a clockdomain to the internal clockdomain list.
- * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is
- * already registered by the provided name, or 0 upon success.
+ * Register the clockdomains available on a particular OMAP SoC. Must
+ * be called after clkdm_register_platform_funcs(). May be called
+ * multiple times. Returns -EACCES if called before
+ * clkdm_register_platform_funcs(); -EINVAL if the argument @cs is
+ * null; or 0 upon success.
*/
-int clkdm_register(struct clockdomain *clkdm)
+int clkdm_register_clkdms(struct clockdomain **cs)
{
- int ret = -EINVAL;
- struct powerdomain *pwrdm;
+ struct clockdomain **c = NULL;
- if (!clkdm || !clkdm->name)
- return -EINVAL;
+ if (!arch_clkdm)
+ return -EACCES;
- if (!omap_chip_is(clkdm->omap_chip))
+ if (!cs)
return -EINVAL;
- pwrdm = pwrdm_lookup(clkdm->pwrdm_name);
- if (!pwrdm) {
- pr_debug("clockdomain: clkdm_register %s: powerdomain %s "
- "does not exist\n", clkdm->name, clkdm->pwrdm_name);
- return -EINVAL;
- }
- clkdm->pwrdm = pwrdm;
+ for (c = cs; *c; c++)
+ _clkdm_register(*c);
- mutex_lock(&clkdm_mutex);
- /* Verify that the clockdomain is not already registered */
- if (_clkdm_lookup(clkdm->name)) {
- ret = -EEXIST;
- goto cr_unlock;
- };
+ return 0;
+}
- list_add(&clkdm->node, &clkdm_list);
+/**
+ * clkdm_register_autodeps - register autodeps (if required)
+ * @ia: pointer to a static array of struct clkdm_autodep to register
+ *
+ * Register clockdomain "automatic dependencies." These are
+ * clockdomain wakeup and sleep dependencies that are automatically
+ * added whenever the first clock inside a clockdomain is enabled, and
+ * removed whenever the last clock inside a clockdomain is disabled.
+ * These are currently only used on OMAP3 devices, and are deprecated,
+ * since they waste energy. However, until the OMAP2/3 IP block
+ * enable/disable sequence can be converted to match the OMAP4
+ * sequence, they are needed.
+ *
+ * Must be called only after all of the SoC clockdomains are
+ * registered, since the function will resolve autodep clockdomain
+ * names into clockdomain pointers.
+ *
+ * The struct clkdm_autodep @ia array must be static, as this function
+ * does not copy the array elements.
+ *
+ * Returns -EACCES if called before any clockdomains have been
+ * registered, -EINVAL if called with a null @ia argument, -EEXIST if
+ * autodeps have already been registered, or 0 upon success.
+ */
+int clkdm_register_autodeps(struct clkdm_autodep *ia)
+{
+ struct clkdm_autodep *a = NULL;
- pwrdm_add_clkdm(pwrdm, clkdm);
+ if (list_empty(&clkdm_list))
+ return -EACCES;
- pr_debug("clockdomain: registered %s\n", clkdm->name);
- ret = 0;
+ if (!ia)
+ return -EINVAL;
-cr_unlock:
- mutex_unlock(&clkdm_mutex);
+ if (autodeps)
+ return -EEXIST;
- return ret;
+ autodeps = ia;
+ for (a = autodeps; a->clkdm.ptr; a++)
+ _autodep_lookup(a);
+
+ return 0;
}
/**
- * clkdm_unregister - unregister a clockdomain
- * @clkdm: struct clockdomain * to unregister
+ * clkdm_complete_init - set up the clockdomain layer
*
- * Removes a clockdomain from the internal clockdomain list. Returns
- * -EINVAL if clkdm argument is NULL.
+ * Put all clockdomains into software-supervised mode; PM code should
+ * later enable hardware-supervised mode as appropriate. Must be
+ * called after clkdm_register_clkdms(). Returns -EACCES if called
+ * before clkdm_register_clkdms(), or 0 upon success.
*/
-int clkdm_unregister(struct clockdomain *clkdm)
+int clkdm_complete_init(void)
{
- if (!clkdm)
- return -EINVAL;
+ struct clockdomain *clkdm;
- pwrdm_del_clkdm(clkdm->pwrdm, clkdm);
+ if (list_empty(&clkdm_list))
+ return -EACCES;
- mutex_lock(&clkdm_mutex);
- list_del(&clkdm->node);
- mutex_unlock(&clkdm_mutex);
+ list_for_each_entry(clkdm, &clkdm_list, node) {
+ if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
+ clkdm_wakeup(clkdm);
+ else if (clkdm->flags & CLKDM_CAN_DISABLE_AUTO)
+ clkdm_deny_idle(clkdm);
- pr_debug("clockdomain: unregistered %s\n", clkdm->name);
+ _resolve_clkdm_deps(clkdm, clkdm->wkdep_srcs);
+ clkdm_clear_all_wkdeps(clkdm);
+
+ _resolve_clkdm_deps(clkdm, clkdm->sleepdep_srcs);
+ clkdm_clear_all_sleepdeps(clkdm);
+ }
return 0;
}
* clkdm_lookup - look up a clockdomain by name, return a pointer
* @name: name of clockdomain
*
- * Find a registered clockdomain by its name. Returns a pointer to the
- * struct clockdomain if found, or NULL otherwise.
+ * Find a registered clockdomain by its name @name. Returns a pointer
+ * to the struct clockdomain if found, or NULL otherwise.
*/
struct clockdomain *clkdm_lookup(const char *name)
{
clkdm = NULL;
- mutex_lock(&clkdm_mutex);
list_for_each_entry(temp_clkdm, &clkdm_list, node) {
if (!strcmp(name, temp_clkdm->name)) {
clkdm = temp_clkdm;
break;
}
}
- mutex_unlock(&clkdm_mutex);
return clkdm;
}
* clkdm_for_each - call function on each registered clockdomain
* @fn: callback function *
*
- * Call the supplied function for each registered clockdomain.
- * The callback function can return anything but 0 to bail
+ * Call the supplied function @fn for each registered clockdomain.
+ * The callback function @fn can return anything but 0 to bail
* out early from the iterator. The callback function is called with
* the clkdm_mutex held, so no clockdomain structure manipulation
* functions should be called from the callback, although hardware
* anything else to indicate failure; or -EINVAL if the function pointer
* is null.
*/
-int clkdm_for_each(int (*fn)(struct clockdomain *clkdm))
+int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
+ void *user)
{
struct clockdomain *clkdm;
int ret = 0;
if (!fn)
return -EINVAL;
- mutex_lock(&clkdm_mutex);
list_for_each_entry(clkdm, &clkdm_list, node) {
- ret = (*fn)(clkdm);
+ ret = (*fn)(clkdm, user);
if (ret)
break;
}
- mutex_unlock(&clkdm_mutex);
return ret;
}
* @clkdm: struct clockdomain *
*
* Return a pointer to the struct powerdomain that the specified clockdomain
- * 'clkdm' exists in, or returns NULL if clkdm argument is NULL.
+ * @clkdm exists in, or returns NULL if @clkdm is NULL.
*/
struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm)
{
if (!clkdm)
return NULL;
- return clkdm->pwrdm;
+ return clkdm->pwrdm.ptr;
}
/* Hardware clockdomain control */
/**
- * omap2_clkdm_clktrctrl_read - read the clkdm's current state transition mode
- * @clk: struct clk * of a clockdomain
+ * clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1
+ * @clkdm1: wake this struct clockdomain * up (dependent)
+ * @clkdm2: when this struct clockdomain * wakes up (source)
+ *
+ * When the clockdomain represented by @clkdm2 wakes up, wake up
+ * @clkdm1. Implemented in hardware on the OMAP, this feature is
+ * designed to reduce wakeup latency of the dependent clockdomain @clkdm1.
+ * Returns -EINVAL if presented with invalid clockdomain pointers,
+ * -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon
+ * success.
+ */
+int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
+{
+ struct clkdm_dep *cd;
+ int ret = 0;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
+ if (IS_ERR(cd))
+ ret = PTR_ERR(cd);
+
+ if (!arch_clkdm || !arch_clkdm->clkdm_add_wkdep)
+ ret = -EINVAL;
+
+ if (ret) {
+ pr_debug("clockdomain: hardware cannot set/clear wake up of "
+ "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
+ return ret;
+ }
+
+ if (atomic_inc_return(&cd->wkdep_usecount) == 1) {
+ pr_debug("clockdomain: hardware will wake up %s when %s wakes "
+ "up\n", clkdm1->name, clkdm2->name);
+
+ ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2);
+ }
+
+ return ret;
+}
+
+/**
+ * clkdm_del_wkdep - remove a wakeup dependency from clkdm2 to clkdm1
+ * @clkdm1: wake this struct clockdomain * up (dependent)
+ * @clkdm2: when this struct clockdomain * wakes up (source)
+ *
+ * Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2
+ * wakes up. Returns -EINVAL if presented with invalid clockdomain
+ * pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or
+ * 0 upon success.
+ */
+int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
+{
+ struct clkdm_dep *cd;
+ int ret = 0;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
+ if (IS_ERR(cd))
+ ret = PTR_ERR(cd);
+
+ if (!arch_clkdm || !arch_clkdm->clkdm_del_wkdep)
+ ret = -EINVAL;
+
+ if (ret) {
+ pr_debug("clockdomain: hardware cannot set/clear wake up of "
+ "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
+ return ret;
+ }
+
+ if (atomic_dec_return(&cd->wkdep_usecount) == 0) {
+ pr_debug("clockdomain: hardware will no longer wake up %s "
+ "after %s wakes up\n", clkdm1->name, clkdm2->name);
+
+ ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2);
+ }
+
+ return ret;
+}
+
+/**
+ * clkdm_read_wkdep - read wakeup dependency state from clkdm2 to clkdm1
+ * @clkdm1: wake this struct clockdomain * up (dependent)
+ * @clkdm2: when this struct clockdomain * wakes up (source)
+ *
+ * Return 1 if a hardware wakeup dependency exists wherein @clkdm1 will be
+ * awoken when @clkdm2 wakes up; 0 if dependency is not set; -EINVAL
+ * if either clockdomain pointer is invalid; or -ENOENT if the hardware
+ * is incapable.
+ *
+ * REVISIT: Currently this function only represents software-controllable
+ * wakeup dependencies. Wakeup dependencies fixed in hardware are not
+ * yet handled here.
+ */
+int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
+{
+ struct clkdm_dep *cd;
+ int ret = 0;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
+ if (IS_ERR(cd))
+ ret = PTR_ERR(cd);
+
+ if (!arch_clkdm || !arch_clkdm->clkdm_read_wkdep)
+ ret = -EINVAL;
+
+ if (ret) {
+ pr_debug("clockdomain: hardware cannot set/clear wake up of "
+ "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
+ return ret;
+ }
+
+ /* XXX It's faster to return the atomic wkdep_usecount */
+ return arch_clkdm->clkdm_read_wkdep(clkdm1, clkdm2);
+}
+
+/**
+ * clkdm_clear_all_wkdeps - remove all wakeup dependencies from target clkdm
+ * @clkdm: struct clockdomain * to remove all wakeup dependencies from
*
- * Return the clockdomain's current state transition mode from the
- * corresponding domain CM_CLKSTCTRL register. Returns -EINVAL if clk
- * is NULL or the current mode upon success.
+ * Remove all inter-clockdomain wakeup dependencies that could cause
+ * @clkdm to wake. Intended to be used during boot to initialize the
+ * PRCM to a known state, after all clockdomains are put into swsup idle
+ * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or
+ * 0 upon success.
*/
-static int omap2_clkdm_clktrctrl_read(struct clockdomain *clkdm)
+int clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
{
- u32 v;
+ if (!clkdm)
+ return -EINVAL;
+ if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_wkdeps)
+ return -EINVAL;
+
+ return arch_clkdm->clkdm_clear_all_wkdeps(clkdm);
+}
+
+/**
+ * clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1
+ * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
+ * @clkdm2: when this struct clockdomain * is active (source)
+ *
+ * Prevent @clkdm1 from automatically going inactive (and then to
+ * retention or off) if @clkdm2 is active. Returns -EINVAL if
+ * presented with invalid clockdomain pointers or called on a machine
+ * that does not support software-configurable hardware sleep
+ * dependencies, -ENOENT if the specified dependency cannot be set in
+ * hardware, or 0 upon success.
+ */
+int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
+{
+ struct clkdm_dep *cd;
+ int ret = 0;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
+ if (IS_ERR(cd))
+ ret = PTR_ERR(cd);
+
+ if (!arch_clkdm || !arch_clkdm->clkdm_add_sleepdep)
+ ret = -EINVAL;
+
+ if (ret) {
+ pr_debug("clockdomain: hardware cannot set/clear sleep "
+ "dependency affecting %s from %s\n", clkdm1->name,
+ clkdm2->name);
+ return ret;
+ }
+
+ if (atomic_inc_return(&cd->sleepdep_usecount) == 1) {
+ pr_debug("clockdomain: will prevent %s from sleeping if %s "
+ "is active\n", clkdm1->name, clkdm2->name);
+
+ ret = arch_clkdm->clkdm_add_sleepdep(clkdm1, clkdm2);
+ }
+
+ return ret;
+}
+
+/**
+ * clkdm_del_sleepdep - remove a sleep dependency from clkdm2 to clkdm1
+ * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
+ * @clkdm2: when this struct clockdomain * is active (source)
+ *
+ * Allow @clkdm1 to automatically go inactive (and then to retention or
+ * off), independent of the activity state of @clkdm2. Returns -EINVAL
+ * if presented with invalid clockdomain pointers or called on a machine
+ * that does not support software-configurable hardware sleep dependencies,
+ * -ENOENT if the specified dependency cannot be cleared in hardware, or
+ * 0 upon success.
+ */
+int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
+{
+ struct clkdm_dep *cd;
+ int ret = 0;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
+ if (IS_ERR(cd))
+ ret = PTR_ERR(cd);
+
+ if (!arch_clkdm || !arch_clkdm->clkdm_del_sleepdep)
+ ret = -EINVAL;
+
+ if (ret) {
+ pr_debug("clockdomain: hardware cannot set/clear sleep "
+ "dependency affecting %s from %s\n", clkdm1->name,
+ clkdm2->name);
+ return ret;
+ }
+
+ if (atomic_dec_return(&cd->sleepdep_usecount) == 0) {
+ pr_debug("clockdomain: will no longer prevent %s from "
+ "sleeping if %s is active\n", clkdm1->name,
+ clkdm2->name);
+
+ ret = arch_clkdm->clkdm_del_sleepdep(clkdm1, clkdm2);
+ }
+
+ return ret;
+}
+
+/**
+ * clkdm_read_sleepdep - read sleep dependency state from clkdm2 to clkdm1
+ * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
+ * @clkdm2: when this struct clockdomain * is active (source)
+ *
+ * Return 1 if a hardware sleep dependency exists wherein @clkdm1 will
+ * not be allowed to automatically go inactive if @clkdm2 is active;
+ * 0 if @clkdm1's automatic power state inactivity transition is independent
+ * of @clkdm2's; -EINVAL if either clockdomain pointer is invalid or called
+ * on a machine that does not support software-configurable hardware sleep
+ * dependencies; or -ENOENT if the hardware is incapable.
+ *
+ * REVISIT: Currently this function only represents software-controllable
+ * sleep dependencies. Sleep dependencies fixed in hardware are not
+ * yet handled here.
+ */
+int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
+{
+ struct clkdm_dep *cd;
+ int ret = 0;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
+ if (IS_ERR(cd))
+ ret = PTR_ERR(cd);
+
+ if (!arch_clkdm || !arch_clkdm->clkdm_read_sleepdep)
+ ret = -EINVAL;
+
+ if (ret) {
+ pr_debug("clockdomain: hardware cannot set/clear sleep "
+ "dependency affecting %s from %s\n", clkdm1->name,
+ clkdm2->name);
+ return ret;
+ }
+
+ /* XXX It's faster to return the atomic sleepdep_usecount */
+ return arch_clkdm->clkdm_read_sleepdep(clkdm1, clkdm2);
+}
+
+/**
+ * clkdm_clear_all_sleepdeps - remove all sleep dependencies from target clkdm
+ * @clkdm: struct clockdomain * to remove all sleep dependencies from
+ *
+ * Remove all inter-clockdomain sleep dependencies that could prevent
+ * @clkdm from idling. Intended to be used during boot to initialize the
+ * PRCM to a known state, after all clockdomains are put into swsup idle
+ * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or
+ * 0 upon success.
+ */
+int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm)
+{
if (!clkdm)
return -EINVAL;
- v = cm_read_mod_reg(clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
- v &= clkdm->clktrctrl_mask;
- v >>= __ffs(clkdm->clktrctrl_mask);
+ if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_sleepdeps)
+ return -EINVAL;
- return v;
+ return arch_clkdm->clkdm_clear_all_sleepdeps(clkdm);
}
/**
- * omap2_clkdm_sleep - force clockdomain sleep transition
+ * clkdm_sleep - force clockdomain sleep transition
* @clkdm: struct clockdomain *
*
* Instruct the CM to force a sleep transition on the specified
- * clockdomain 'clkdm'. Returns -EINVAL if clk is NULL or if
+ * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if
* clockdomain does not support software-initiated sleep; 0 upon
* success.
*/
-int omap2_clkdm_sleep(struct clockdomain *clkdm)
+int clkdm_sleep(struct clockdomain *clkdm)
{
+ int ret;
+ unsigned long flags;
+
if (!clkdm)
return -EINVAL;
return -EINVAL;
}
- pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name);
-
- if (cpu_is_omap24xx()) {
-
- cm_set_mod_reg_bits(OMAP24XX_FORCESTATE,
- clkdm->pwrdm->prcm_offs, PM_PWSTCTRL);
-
- } else if (cpu_is_omap34xx()) {
-
- u32 v = (OMAP34XX_CLKSTCTRL_FORCE_SLEEP <<
- __ffs(clkdm->clktrctrl_mask));
-
- cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, v,
- clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
+ if (!arch_clkdm || !arch_clkdm->clkdm_sleep)
+ return -EINVAL;
- } else {
- BUG();
- };
+ pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name);
- return 0;
+ spin_lock_irqsave(&clkdm->lock, flags);
+ clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED;
+ ret = arch_clkdm->clkdm_sleep(clkdm);
+ spin_unlock_irqrestore(&clkdm->lock, flags);
+ return ret;
}
/**
- * omap2_clkdm_wakeup - force clockdomain wakeup transition
+ * clkdm_wakeup - force clockdomain wakeup transition
* @clkdm: struct clockdomain *
*
* Instruct the CM to force a wakeup transition on the specified
- * clockdomain 'clkdm'. Returns -EINVAL if clkdm is NULL or if the
+ * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if the
* clockdomain does not support software-controlled wakeup; 0 upon
* success.
*/
-int omap2_clkdm_wakeup(struct clockdomain *clkdm)
+int clkdm_wakeup(struct clockdomain *clkdm)
{
+ int ret;
+ unsigned long flags;
+
if (!clkdm)
return -EINVAL;
return -EINVAL;
}
- pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name);
-
- if (cpu_is_omap24xx()) {
-
- cm_clear_mod_reg_bits(OMAP24XX_FORCESTATE,
- clkdm->pwrdm->prcm_offs, PM_PWSTCTRL);
-
- } else if (cpu_is_omap34xx()) {
-
- u32 v = (OMAP34XX_CLKSTCTRL_FORCE_WAKEUP <<
- __ffs(clkdm->clktrctrl_mask));
-
- cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, v,
- clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
+ if (!arch_clkdm || !arch_clkdm->clkdm_wakeup)
+ return -EINVAL;
- } else {
- BUG();
- };
+ pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name);
- return 0;
+ spin_lock_irqsave(&clkdm->lock, flags);
+ clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED;
+ ret = arch_clkdm->clkdm_wakeup(clkdm);
+ ret |= pwrdm_state_switch(clkdm->pwrdm.ptr);
+ spin_unlock_irqrestore(&clkdm->lock, flags);
+ return ret;
}
/**
- * omap2_clkdm_allow_idle - enable hwsup idle transitions for clkdm
+ * clkdm_allow_idle - enable hwsup idle transitions for clkdm
* @clkdm: struct clockdomain *
*
- * Allow the hardware to automatically switch the clockdomain into
+ * Allow the hardware to automatically switch the clockdomain @clkdm into
* active or idle states, as needed by downstream clocks. If the
* clockdomain has any downstream clocks enabled in the clock
* framework, wkdep/sleepdep autodependencies are added; this is so
* device drivers can read and write to the device. No return value.
*/
-void omap2_clkdm_allow_idle(struct clockdomain *clkdm)
+void clkdm_allow_idle(struct clockdomain *clkdm)
{
- u32 v;
+ unsigned long flags;
if (!clkdm)
return;
return;
}
+ if (!arch_clkdm || !arch_clkdm->clkdm_allow_idle)
+ return;
+
pr_debug("clockdomain: enabling automatic idle transitions for %s\n",
clkdm->name);
- if (atomic_read(&clkdm->usecount) > 0)
- _clkdm_add_autodeps(clkdm);
-
- if (cpu_is_omap24xx())
- v = OMAP24XX_CLKSTCTRL_ENABLE_AUTO;
- else if (cpu_is_omap34xx())
- v = OMAP34XX_CLKSTCTRL_ENABLE_AUTO;
- else
- BUG();
-
-
- cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask,
- v << __ffs(clkdm->clktrctrl_mask),
- clkdm->pwrdm->prcm_offs,
- CM_CLKSTCTRL);
+ spin_lock_irqsave(&clkdm->lock, flags);
+ clkdm->_flags |= _CLKDM_FLAG_HWSUP_ENABLED;
+ arch_clkdm->clkdm_allow_idle(clkdm);
+ pwrdm_clkdm_state_switch(clkdm);
+ spin_unlock_irqrestore(&clkdm->lock, flags);
}
/**
- * omap2_clkdm_deny_idle - disable hwsup idle transitions for clkdm
+ * clkdm_deny_idle - disable hwsup idle transitions for clkdm
* @clkdm: struct clockdomain *
*
* Prevent the hardware from automatically switching the clockdomain
- * into inactive or idle states. If the clockdomain has downstream
- * clocks enabled in the clock framework, wkdep/sleepdep
+ * @clkdm into inactive or idle states. If the clockdomain has
+ * downstream clocks enabled in the clock framework, wkdep/sleepdep
* autodependencies are removed. No return value.
*/
-void omap2_clkdm_deny_idle(struct clockdomain *clkdm)
+void clkdm_deny_idle(struct clockdomain *clkdm)
{
- u32 v;
+ unsigned long flags;
if (!clkdm)
return;
return;
}
+ if (!arch_clkdm || !arch_clkdm->clkdm_deny_idle)
+ return;
+
pr_debug("clockdomain: disabling automatic idle transitions for %s\n",
clkdm->name);
- if (cpu_is_omap24xx())
- v = OMAP24XX_CLKSTCTRL_DISABLE_AUTO;
- else if (cpu_is_omap34xx())
- v = OMAP34XX_CLKSTCTRL_DISABLE_AUTO;
- else
- BUG();
-
- cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask,
- v << __ffs(clkdm->clktrctrl_mask),
- clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
-
- if (atomic_read(&clkdm->usecount) > 0)
- _clkdm_del_autodeps(clkdm);
+ spin_lock_irqsave(&clkdm->lock, flags);
+ clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED;
+ arch_clkdm->clkdm_deny_idle(clkdm);
+ pwrdm_state_switch(clkdm->pwrdm.ptr);
+ spin_unlock_irqrestore(&clkdm->lock, flags);
}
-
-/* Clockdomain-to-clock framework interface code */
-
/**
- * omap2_clkdm_clk_enable - add an enabled downstream clock to this clkdm
+ * clkdm_in_hwsup - is clockdomain @clkdm have hardware-supervised idle enabled?
* @clkdm: struct clockdomain *
- * @clk: struct clk * of the enabled downstream clock
*
- * Increment the usecount of this clockdomain 'clkdm' and ensure that
- * it is awake. Intended to be called by clk_enable() code. If the
- * clockdomain is in software-supervised idle mode, force the
- * clockdomain to wake. If the clockdomain is in hardware-supervised
- * idle mode, add clkdm-pwrdm autodependencies, to ensure that devices
- * in the clockdomain can be read from/written to by on-chip processors.
- * Returns -EINVAL if passed null pointers; returns 0 upon success or
- * if the clockdomain is in hwsup idle mode.
+ * Returns true if clockdomain @clkdm currently has
+ * hardware-supervised idle enabled, or false if it does not or if
+ * @clkdm is NULL. It is only valid to call this function after
+ * clkdm_init() has been called. This function does not actually read
+ * bits from the hardware; it instead tests an in-memory flag that is
+ * changed whenever the clockdomain code changes the auto-idle mode.
*/
-int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk)
+bool clkdm_in_hwsup(struct clockdomain *clkdm)
{
- int v;
+ bool ret;
+ unsigned long flags;
+
+ if (!clkdm)
+ return false;
+
+ spin_lock_irqsave(&clkdm->lock, flags);
+ ret = (clkdm->_flags & _CLKDM_FLAG_HWSUP_ENABLED) ? true : false;
+ spin_unlock_irqrestore(&clkdm->lock, flags);
+
+ return ret;
+}
+
+/* Clockdomain-to-clock/hwmod framework interface code */
+
+static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm)
+{
+ unsigned long flags;
+
+ if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_enable)
+ return -EINVAL;
/*
- * XXX Rewrite this code to maintain a list of enabled
- * downstream clocks for debugging purposes?
+ * For arch's with no autodeps, clkcm_clk_enable
+ * should be called for every clock instance or hwmod that is
+ * enabled, so the clkdm can be force woken up.
*/
+ if ((atomic_inc_return(&clkdm->usecount) > 1) && autodeps)
+ return 0;
+
+ spin_lock_irqsave(&clkdm->lock, flags);
+ arch_clkdm->clkdm_clk_enable(clkdm);
+ pwrdm_wait_transition(clkdm->pwrdm.ptr);
+ pwrdm_clkdm_state_switch(clkdm);
+ spin_unlock_irqrestore(&clkdm->lock, flags);
+
+ pr_debug("clockdomain: clkdm %s: enabled\n", clkdm->name);
+
+ return 0;
+}
+
+static int _clkdm_clk_hwmod_disable(struct clockdomain *clkdm)
+{
+ unsigned long flags;
- if (!clkdm || !clk)
+ if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_disable)
return -EINVAL;
- if (atomic_inc_return(&clkdm->usecount) > 1)
+ if (atomic_read(&clkdm->usecount) == 0) {
+ WARN_ON(1); /* underflow */
+ return -ERANGE;
+ }
+
+ if (atomic_dec_return(&clkdm->usecount) > 0)
return 0;
- /* Clockdomain now has one enabled downstream clock */
+ spin_lock_irqsave(&clkdm->lock, flags);
+ arch_clkdm->clkdm_clk_disable(clkdm);
+ pwrdm_clkdm_state_switch(clkdm);
+ spin_unlock_irqrestore(&clkdm->lock, flags);
- pr_debug("clockdomain: clkdm %s: clk %s now enabled\n", clkdm->name,
- clk->name);
+ pr_debug("clockdomain: clkdm %s: disabled\n", clkdm->name);
- v = omap2_clkdm_clktrctrl_read(clkdm);
+ return 0;
+}
+
+/**
+ * clkdm_clk_enable - add an enabled downstream clock to this clkdm
+ * @clkdm: struct clockdomain *
+ * @clk: struct clk * of the enabled downstream clock
+ *
+ * Increment the usecount of the clockdomain @clkdm and ensure that it
+ * is awake before @clk is enabled. Intended to be called by
+ * clk_enable() code. If the clockdomain is in software-supervised
+ * idle mode, force the clockdomain to wake. If the clockdomain is in
+ * hardware-supervised idle mode, add clkdm-pwrdm autodependencies, to
+ * ensure that devices in the clockdomain can be read from/written to
+ * by on-chip processors. Returns -EINVAL if passed null pointers;
+ * returns 0 upon success or if the clockdomain is in hwsup idle mode.
+ */
+int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk)
+{
+ /*
+ * XXX Rewrite this code to maintain a list of enabled
+ * downstream clocks for debugging purposes?
+ */
- if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ||
- (cpu_is_omap24xx() && v == OMAP24XX_CLKSTCTRL_ENABLE_AUTO))
- _clkdm_add_autodeps(clkdm);
- else
- omap2_clkdm_wakeup(clkdm);
+ if (!clk)
+ return -EINVAL;
- return 0;
+ return _clkdm_clk_hwmod_enable(clkdm);
}
/**
- * omap2_clkdm_clk_disable - remove an enabled downstream clock from this clkdm
+ * clkdm_clk_disable - remove an enabled downstream clock from this clkdm
* @clkdm: struct clockdomain *
* @clk: struct clk * of the disabled downstream clock
*
- * Decrement the usecount of this clockdomain 'clkdm'. Intended to be
- * called by clk_disable() code. If the usecount goes to 0, put the
- * clockdomain to sleep (software-supervised mode) or remove the
- * clkdm-pwrdm autodependencies (hardware-supervised mode). Returns
- * -EINVAL if passed null pointers; -ERANGE if the clkdm usecount
- * underflows and debugging is enabled; or returns 0 upon success or
- * if the clockdomain is in hwsup idle mode.
+ * Decrement the usecount of this clockdomain @clkdm when @clk is
+ * disabled. Intended to be called by clk_disable() code. If the
+ * clockdomain usecount goes to 0, put the clockdomain to sleep
+ * (software-supervised mode) or remove the clkdm autodependencies
+ * (hardware-supervised mode). Returns -EINVAL if passed null
+ * pointers; -ERANGE if the @clkdm usecount underflows; or returns 0
+ * upon success or if the clockdomain is in hwsup idle mode.
*/
-int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk)
+int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk)
{
- int v;
-
/*
* XXX Rewrite this code to maintain a list of enabled
* downstream clocks for debugging purposes?
*/
- if (!clkdm || !clk)
+ if (!clk)
return -EINVAL;
-#ifdef DEBUG
- if (atomic_read(&clkdm->usecount) == 0) {
- WARN_ON(1); /* underflow */
- return -ERANGE;
- }
-#endif
+ return _clkdm_clk_hwmod_disable(clkdm);
+}
- if (atomic_dec_return(&clkdm->usecount) > 0)
+/**
+ * clkdm_hwmod_enable - add an enabled downstream hwmod to this clkdm
+ * @clkdm: struct clockdomain *
+ * @oh: struct omap_hwmod * of the enabled downstream hwmod
+ *
+ * Increment the usecount of the clockdomain @clkdm and ensure that it
+ * is awake before @oh is enabled. Intended to be called by
+ * module_enable() code.
+ * If the clockdomain is in software-supervised idle mode, force the
+ * clockdomain to wake. If the clockdomain is in hardware-supervised idle
+ * mode, add clkdm-pwrdm autodependencies, to ensure that devices in the
+ * clockdomain can be read from/written to by on-chip processors.
+ * Returns -EINVAL if passed null pointers;
+ * returns 0 upon success or if the clockdomain is in hwsup idle mode.
+ */
+int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh)
+{
+ /* The clkdm attribute does not exist yet prior OMAP4 */
+ if (cpu_is_omap24xx() || cpu_is_omap34xx())
return 0;
- /* All downstream clocks of this clockdomain are now disabled */
+ /*
+ * XXX Rewrite this code to maintain a list of enabled
+ * downstream hwmods for debugging purposes?
+ */
+
+ if (!oh)
+ return -EINVAL;
+
+ return _clkdm_clk_hwmod_enable(clkdm);
+}
- pr_debug("clockdomain: clkdm %s: clk %s now disabled\n", clkdm->name,
- clk->name);
+/**
+ * clkdm_hwmod_disable - remove an enabled downstream hwmod from this clkdm
+ * @clkdm: struct clockdomain *
+ * @oh: struct omap_hwmod * of the disabled downstream hwmod
+ *
+ * Decrement the usecount of this clockdomain @clkdm when @oh is
+ * disabled. Intended to be called by module_disable() code.
+ * If the clockdomain usecount goes to 0, put the clockdomain to sleep
+ * (software-supervised mode) or remove the clkdm autodependencies
+ * (hardware-supervised mode).
+ * Returns -EINVAL if passed null pointers; -ERANGE if the @clkdm usecount
+ * underflows; or returns 0 upon success or if the clockdomain is in hwsup
+ * idle mode.
+ */
+int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh)
+{
+ /* The clkdm attribute does not exist yet prior OMAP4 */
+ if (cpu_is_omap24xx() || cpu_is_omap34xx())
+ return 0;
- v = omap2_clkdm_clktrctrl_read(clkdm);
+ /*
+ * XXX Rewrite this code to maintain a list of enabled
+ * downstream hwmods for debugging purposes?
+ */
- if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ||
- (cpu_is_omap24xx() && v == OMAP24XX_CLKSTCTRL_ENABLE_AUTO))
- _clkdm_del_autodeps(clkdm);
- else
- omap2_clkdm_sleep(clkdm);
+ if (!oh)
+ return -EINVAL;
- return 0;
+ return _clkdm_clk_hwmod_disable(clkdm);
}
projects / linux-flexiantxendom0-3.2.10.git / blobdiff