/*
- * OMAP2/3 clockdomain framework functions
+ * OMAP2/3/4 clockdomain framework functions
*
- * Copyright (C) 2008 Texas Instruments, Inc.
- * Copyright (C) 2008-2009 Nokia Corporation
+ * Copyright (C) 2008-2010 Texas Instruments, Inc.
+ * Copyright (C) 2008-2010 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
#include <linux/bitops.h>
-#include <plat/clock.h>
-
#include "prm.h"
#include "prm-regbits-24xx.h"
#include "cm.h"
+#include <plat/clock.h>
#include <plat/powerdomain.h>
#include <plat/clockdomain.h>
+#include <plat/prcm.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;
/* 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;
+
+ if (!omap_chip_is(clkdm->omap_chip))
+ 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);
+
+ 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 || !omap_chip_is(clkdm->omap_chip))
+ return ERR_PTR(-EINVAL);
+
+ for (cd = deps; cd->clkdm_name; cd++) {
+ if (!omap_chip_is(cd->omap_chip))
+ continue;
+
+ 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.
*/
-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_err("clockdomain: autodeps: powerdomain %s does not exist\n",
- autodep->pwrdm.name);
- pwrdm = ERR_PTR(-ENOENT);
+ 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.ptr = pwrdm;
+ autodep->clkdm.ptr = clkdm;
}
/*
*/
static void _clkdm_add_autodeps(struct clockdomain *clkdm)
{
- struct clkdm_pwrdm_autodep *autodep;
+ struct clkdm_autodep *autodep;
- for (autodep = autodeps; autodep->pwrdm.ptr; autodep++) {
- if (IS_ERR(autodep->pwrdm.ptr))
+ if (!autodeps)
+ return;
+
+ for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
+ if (IS_ERR(autodep->clkdm.ptr))
continue;
if (!omap_chip_is(autodep->omap_chip))
continue;
pr_debug("clockdomain: adding %s sleepdep/wkdep for "
- "pwrdm %s\n", autodep->pwrdm.ptr->name,
- clkdm->pwrdm.ptr->name);
+ "clkdm %s\n", autodep->clkdm.ptr->name,
+ clkdm->name);
- pwrdm_add_sleepdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr);
- pwrdm_add_wkdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr);
+ clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr);
+ clkdm_add_wkdep(clkdm, autodep->clkdm.ptr);
}
}
*/
static void _clkdm_del_autodeps(struct clockdomain *clkdm)
{
- struct clkdm_pwrdm_autodep *autodep;
+ struct clkdm_autodep *autodep;
+
+ if (!autodeps)
+ return;
- for (autodep = autodeps; autodep->pwrdm.ptr; autodep++) {
- if (IS_ERR(autodep->pwrdm.ptr))
+ for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
+ if (IS_ERR(autodep->clkdm.ptr))
continue;
if (!omap_chip_is(autodep->omap_chip))
continue;
pr_debug("clockdomain: removing %s sleepdep/wkdep for "
- "pwrdm %s\n", autodep->pwrdm.ptr->name,
- clkdm->pwrdm.ptr->name);
+ "clkdm %s\n", autodep->clkdm.ptr->name,
+ clkdm->name);
- pwrdm_del_sleepdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr);
- pwrdm_del_wkdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr);
+ clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr);
+ clkdm_del_wkdep(clkdm, autodep->clkdm.ptr);
}
}
*/
static void _omap2_clkdm_set_hwsup(struct clockdomain *clkdm, int enable)
{
- u32 v;
+ u32 bits, v;
if (cpu_is_omap24xx()) {
if (enable)
- v = OMAP24XX_CLKSTCTRL_ENABLE_AUTO;
+ bits = OMAP24XX_CLKSTCTRL_ENABLE_AUTO;
else
- v = OMAP24XX_CLKSTCTRL_DISABLE_AUTO;
- } else if (cpu_is_omap34xx()) {
+ bits = OMAP24XX_CLKSTCTRL_DISABLE_AUTO;
+ } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
if (enable)
- v = OMAP34XX_CLKSTCTRL_ENABLE_AUTO;
+ bits = OMAP34XX_CLKSTCTRL_ENABLE_AUTO;
else
- v = OMAP34XX_CLKSTCTRL_DISABLE_AUTO;
+ bits = OMAP34XX_CLKSTCTRL_DISABLE_AUTO;
} else {
BUG();
}
- cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask,
- v << __ffs(clkdm->clktrctrl_mask),
- clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL);
-}
-
-static struct clockdomain *_clkdm_lookup(const char *name)
-{
- struct clockdomain *clkdm, *temp_clkdm;
-
- if (!name)
- return NULL;
-
- clkdm = NULL;
+ bits = bits << __ffs(clkdm->clktrctrl_mask);
- list_for_each_entry(temp_clkdm, &clkdm_list, node) {
- if (!strcmp(name, temp_clkdm->name)) {
- clkdm = temp_clkdm;
- break;
- }
- }
+ v = __raw_readl(clkdm->clkstctrl_reg);
+ v &= ~(clkdm->clktrctrl_mask);
+ v |= bits;
+ __raw_writel(v, clkdm->clkstctrl_reg);
- 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
+ * _init_wkdep_usecount - initialize wkdep usecounts to match hardware
+ * @clkdm: clockdomain to initialize wkdep usecounts
*
- * 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.
+ * Initialize the wakeup dependency usecount variables for clockdomain @clkdm.
+ * If a wakeup dependency is present in the hardware, the usecount will be
+ * set to 1; otherwise, it will be set to 0. Software should clear all
+ * software wakeup dependencies prior to calling this function if it wishes
+ * to ensure that all usecounts start at 0. No return value.
*/
-void clkdm_init(struct clockdomain **clkdms,
- struct clkdm_pwrdm_autodep *init_autodeps)
+static void _init_wkdep_usecount(struct clockdomain *clkdm)
{
- struct clockdomain **c = NULL;
- struct clkdm_pwrdm_autodep *autodep = NULL;
+ u32 v;
+ struct clkdm_dep *cd;
- if (clkdms)
- for (c = clkdms; *c; c++)
- clkdm_register(*c);
+ if (!clkdm->wkdep_srcs)
+ return;
- autodeps = init_autodeps;
- if (autodeps)
- for (autodep = autodeps; autodep->pwrdm.ptr; autodep++)
- _autodep_lookup(autodep);
+ for (cd = clkdm->wkdep_srcs; cd->clkdm_name; cd++) {
+ if (!omap_chip_is(cd->omap_chip))
+ continue;
+
+ if (!cd->clkdm && cd->clkdm_name)
+ cd->clkdm = _clkdm_lookup(cd->clkdm_name);
+
+ if (!cd->clkdm) {
+ WARN(!cd->clkdm, "clockdomain: %s: wkdep clkdm %s not "
+ "found\n", clkdm->name, cd->clkdm_name);
+ continue;
+ }
+
+ v = prm_read_mod_bits_shift(clkdm->pwrdm.ptr->prcm_offs,
+ PM_WKDEP,
+ (1 << cd->clkdm->dep_bit));
+
+ if (v)
+ pr_debug("clockdomain: %s: wakeup dependency already "
+ "set to wake up when %s wakes\n",
+ clkdm->name, cd->clkdm->name);
+
+ atomic_set(&cd->wkdep_usecount, (v) ? 1 : 0);
+ }
}
/**
- * clkdm_register - register a clockdomain
- * @clkdm: struct clockdomain * to register
+ * _init_sleepdep_usecount - initialize sleepdep usecounts to match hardware
+ * @clkdm: clockdomain to initialize sleepdep usecounts
*
- * 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.
+ * Initialize the sleep dependency usecount variables for clockdomain @clkdm.
+ * If a sleep dependency is present in the hardware, the usecount will be
+ * set to 1; otherwise, it will be set to 0. Software should clear all
+ * software sleep dependencies prior to calling this function if it wishes
+ * to ensure that all usecounts start at 0. No return value.
*/
-int clkdm_register(struct clockdomain *clkdm)
+static void _init_sleepdep_usecount(struct clockdomain *clkdm)
{
- int ret = -EINVAL;
- struct powerdomain *pwrdm;
+ u32 v;
+ struct clkdm_dep *cd;
- if (!clkdm || !clkdm->name)
- return -EINVAL;
+ if (!cpu_is_omap34xx())
+ return;
- if (!omap_chip_is(clkdm->omap_chip))
- return -EINVAL;
+ if (!clkdm->sleepdep_srcs)
+ return;
- 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;
+ for (cd = clkdm->sleepdep_srcs; cd->clkdm_name; cd++) {
+ if (!omap_chip_is(cd->omap_chip))
+ continue;
- mutex_lock(&clkdm_mutex);
- /* Verify that the clockdomain is not already registered */
- if (_clkdm_lookup(clkdm->name)) {
- ret = -EEXIST;
- goto cr_unlock;
- }
+ if (!cd->clkdm && cd->clkdm_name)
+ cd->clkdm = _clkdm_lookup(cd->clkdm_name);
- list_add(&clkdm->node, &clkdm_list);
+ if (!cd->clkdm) {
+ WARN(!cd->clkdm, "clockdomain: %s: sleepdep clkdm %s "
+ "not found\n", clkdm->name, cd->clkdm_name);
+ continue;
+ }
- pwrdm_add_clkdm(pwrdm, clkdm);
+ v = prm_read_mod_bits_shift(clkdm->pwrdm.ptr->prcm_offs,
+ OMAP3430_CM_SLEEPDEP,
+ (1 << cd->clkdm->dep_bit));
- pr_debug("clockdomain: registered %s\n", clkdm->name);
- ret = 0;
+ if (v)
+ pr_debug("clockdomain: %s: sleep dependency already "
+ "set to prevent from idling until %s "
+ "idles\n", clkdm->name, cd->clkdm->name);
-cr_unlock:
- mutex_unlock(&clkdm_mutex);
+ atomic_set(&cd->sleepdep_usecount, (v) ? 1 : 0);
+ }
+};
- return ret;
-}
+/* Public functions */
/**
- * clkdm_unregister - unregister a clockdomain
- * @clkdm: struct clockdomain * to unregister
+ * 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
*
- * Removes a clockdomain from the internal clockdomain list. Returns
- * -EINVAL if clkdm argument is NULL.
+ * Set up internal state. If a pointer to an array of clockdomains
+ * @clkdms 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 autodependencies
+ * @init_autodeps was provided, register those. No return value.
*/
-int clkdm_unregister(struct clockdomain *clkdm)
+void clkdm_init(struct clockdomain **clkdms,
+ struct clkdm_autodep *init_autodeps)
{
- if (!clkdm)
- return -EINVAL;
-
- pwrdm_del_clkdm(clkdm->pwrdm.ptr, clkdm);
+ struct clockdomain **c = NULL;
+ struct clockdomain *clkdm;
+ struct clkdm_autodep *autodep = NULL;
- mutex_lock(&clkdm_mutex);
- list_del(&clkdm->node);
- mutex_unlock(&clkdm_mutex);
+ if (clkdms)
+ for (c = clkdms; *c; c++)
+ _clkdm_register(*c);
- pr_debug("clockdomain: unregistered %s\n", clkdm->name);
+ autodeps = init_autodeps;
+ if (autodeps)
+ for (autodep = autodeps; autodep->clkdm.ptr; autodep++)
+ _autodep_lookup(autodep);
- return 0;
+ /*
+ * Ensure that the *dep_usecount registers reflect the current
+ * state of the PRCM.
+ */
+ list_for_each_entry(clkdm, &clkdm_list, node) {
+ _init_wkdep_usecount(clkdm);
+ _init_sleepdep_usecount(clkdm);
+ }
}
/**
* 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
if (!fn)
return -EINVAL;
- mutex_lock(&clkdm_mutex);
list_for_each_entry(clkdm, &clkdm_list, node) {
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)
{
/* Hardware clockdomain control */
+/**
+ * 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;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
+ if (IS_ERR(cd)) {
+ pr_debug("clockdomain: hardware cannot set/clear wake up of "
+ "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
+ return PTR_ERR(cd);
+ }
+
+ 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);
+
+ prm_set_mod_reg_bits((1 << clkdm2->dep_bit),
+ clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
+ }
+
+ return 0;
+}
+
+/**
+ * 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;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
+ if (IS_ERR(cd)) {
+ pr_debug("clockdomain: hardware cannot set/clear wake up of "
+ "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
+ return PTR_ERR(cd);
+ }
+
+ 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);
+
+ prm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
+ clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
+ }
+
+ return 0;
+}
+
+/**
+ * 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;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
+ if (IS_ERR(cd)) {
+ pr_debug("clockdomain: hardware cannot set/clear wake up of "
+ "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
+ return PTR_ERR(cd);
+ }
+
+ /* XXX It's faster to return the atomic wkdep_usecount */
+ return prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP,
+ (1 << clkdm2->dep_bit));
+}
+
+/**
+ * clkdm_clear_all_wkdeps - remove all wakeup dependencies from target clkdm
+ * @clkdm: struct clockdomain * to remove all wakeup dependencies from
+ *
+ * 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.
+ */
+int clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
+{
+ struct clkdm_dep *cd;
+ u32 mask = 0;
+
+ if (!clkdm)
+ return -EINVAL;
+
+ for (cd = clkdm->wkdep_srcs; cd && cd->clkdm_name; cd++) {
+ if (!omap_chip_is(cd->omap_chip))
+ continue;
+
+ /* PRM accesses are slow, so minimize them */
+ mask |= 1 << cd->clkdm->dep_bit;
+ atomic_set(&cd->wkdep_usecount, 0);
+ }
+
+ prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs, PM_WKDEP);
+
+ return 0;
+}
+
+/**
+ * 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;
+
+ if (!cpu_is_omap34xx())
+ return -EINVAL;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
+ if (IS_ERR(cd)) {
+ pr_debug("clockdomain: hardware cannot set/clear sleep "
+ "dependency affecting %s from %s\n", clkdm1->name,
+ clkdm2->name);
+ return PTR_ERR(cd);
+ }
+
+ 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);
+
+ cm_set_mod_reg_bits((1 << clkdm2->dep_bit),
+ clkdm1->pwrdm.ptr->prcm_offs,
+ OMAP3430_CM_SLEEPDEP);
+ }
+
+ return 0;
+}
+
+/**
+ * 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;
+
+ if (!cpu_is_omap34xx())
+ return -EINVAL;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
+ if (IS_ERR(cd)) {
+ pr_debug("clockdomain: hardware cannot set/clear sleep "
+ "dependency affecting %s from %s\n", clkdm1->name,
+ clkdm2->name);
+ return PTR_ERR(cd);
+ }
+
+ 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);
+
+ cm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
+ clkdm1->pwrdm.ptr->prcm_offs,
+ OMAP3430_CM_SLEEPDEP);
+ }
+
+ return 0;
+}
+
+/**
+ * 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;
+
+ if (!cpu_is_omap34xx())
+ return -EINVAL;
+
+ if (!clkdm1 || !clkdm2)
+ return -EINVAL;
+
+ cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
+ if (IS_ERR(cd)) {
+ pr_debug("clockdomain: hardware cannot set/clear sleep "
+ "dependency affecting %s from %s\n", clkdm1->name,
+ clkdm2->name);
+ return PTR_ERR(cd);
+ }
+
+ /* XXX It's faster to return the atomic sleepdep_usecount */
+ return prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs,
+ OMAP3430_CM_SLEEPDEP,
+ (1 << clkdm2->dep_bit));
+}
+
+/**
+ * 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)
+{
+ struct clkdm_dep *cd;
+ u32 mask = 0;
+
+ if (!cpu_is_omap34xx())
+ return -EINVAL;
+
+ if (!clkdm)
+ return -EINVAL;
+
+ for (cd = clkdm->sleepdep_srcs; cd && cd->clkdm_name; cd++) {
+ if (!omap_chip_is(cd->omap_chip))
+ continue;
+
+ /* PRM accesses are slow, so minimize them */
+ mask |= 1 << cd->clkdm->dep_bit;
+ atomic_set(&cd->sleepdep_usecount, 0);
+ }
+
+ prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,
+ OMAP3430_CM_SLEEPDEP);
+
+ return 0;
+}
+
/**
* omap2_clkdm_clktrctrl_read - read the clkdm's current state transition mode
- * @clk: struct clk * of a clockdomain
+ * @clkdm: struct clkdm * of a clockdomain
*
- * Return the clockdomain's current state transition mode from the
- * corresponding domain CM_CLKSTCTRL register. Returns -EINVAL if clk
+ * Return the clockdomain @clkdm current state transition mode from the
+ * corresponding domain CM_CLKSTCTRL register. Returns -EINVAL if @clkdm
* is NULL or the current mode upon success.
*/
static int omap2_clkdm_clktrctrl_read(struct clockdomain *clkdm)
if (!clkdm)
return -EINVAL;
- v = cm_read_mod_reg(clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL);
+ v = __raw_readl(clkdm->clkstctrl_reg);
v &= clkdm->clktrctrl_mask;
v >>= __ffs(clkdm->clktrctrl_mask);
* @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.
*/
if (cpu_is_omap24xx()) {
cm_set_mod_reg_bits(OMAP24XX_FORCESTATE,
- clkdm->pwrdm.ptr->prcm_offs, PM_PWSTCTRL);
+ clkdm->pwrdm.ptr->prcm_offs, OMAP2_PM_PWSTCTRL);
- } else if (cpu_is_omap34xx()) {
+ } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
- u32 v = (OMAP34XX_CLKSTCTRL_FORCE_SLEEP <<
+ u32 bits = (OMAP34XX_CLKSTCTRL_FORCE_SLEEP <<
__ffs(clkdm->clktrctrl_mask));
- cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, v,
- clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL);
+ u32 v = __raw_readl(clkdm->clkstctrl_reg);
+ v &= ~(clkdm->clktrctrl_mask);
+ v |= bits;
+ __raw_writel(v, clkdm->clkstctrl_reg);
} else {
BUG();
* @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.
*/
if (cpu_is_omap24xx()) {
cm_clear_mod_reg_bits(OMAP24XX_FORCESTATE,
- clkdm->pwrdm.ptr->prcm_offs, PM_PWSTCTRL);
+ clkdm->pwrdm.ptr->prcm_offs, OMAP2_PM_PWSTCTRL);
- } else if (cpu_is_omap34xx()) {
+ } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
- u32 v = (OMAP34XX_CLKSTCTRL_FORCE_WAKEUP <<
+ u32 bits = (OMAP34XX_CLKSTCTRL_FORCE_WAKEUP <<
__ffs(clkdm->clktrctrl_mask));
- cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, v,
- clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL);
+ u32 v = __raw_readl(clkdm->clkstctrl_reg);
+ v &= ~(clkdm->clktrctrl_mask);
+ v |= bits;
+ __raw_writel(v, clkdm->clkstctrl_reg);
} else {
BUG();
* omap2_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
pr_debug("clockdomain: enabling automatic idle transitions for %s\n",
clkdm->name);
- if (atomic_read(&clkdm->usecount) > 0)
- _clkdm_add_autodeps(clkdm);
+ /*
+ * XXX This should be removed once TI adds wakeup/sleep
+ * dependency code and data for OMAP4.
+ */
+ if (cpu_is_omap44xx()) {
+ WARN_ONCE(1, "clockdomain: OMAP4 wakeup/sleep dependency "
+ "support is not yet implemented\n");
+ } else {
+ if (atomic_read(&clkdm->usecount) > 0)
+ _clkdm_add_autodeps(clkdm);
+ }
_omap2_clkdm_set_hwsup(clkdm, 1);
* @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)
_omap2_clkdm_set_hwsup(clkdm, 0);
- if (atomic_read(&clkdm->usecount) > 0)
- _clkdm_del_autodeps(clkdm);
+ /*
+ * XXX This should be removed once TI adds wakeup/sleep
+ * dependency code and data for OMAP4.
+ */
+ if (cpu_is_omap44xx()) {
+ WARN_ONCE(1, "clockdomain: OMAP4 wakeup/sleep dependency "
+ "support is not yet implemented\n");
+ } else {
+ if (atomic_read(&clkdm->usecount) > 0)
+ _clkdm_del_autodeps(clkdm);
+ }
}
* @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.
+ * 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 omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk)
{
* downstream clocks for debugging purposes?
*/
- if (!clkdm || !clk || !clkdm->clktrctrl_mask)
+ if (!clkdm || !clk)
return -EINVAL;
if (atomic_inc_return(&clkdm->usecount) > 1)
pr_debug("clockdomain: clkdm %s: clk %s now enabled\n", clkdm->name,
clk->name);
+ if (!clkdm->clkstctrl_reg)
+ return 0;
+
v = omap2_clkdm_clktrctrl_read(clkdm);
if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ||
* @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 and debugging
+ * is enabled; 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)
{
* downstream clocks for debugging purposes?
*/
- if (!clkdm || !clk || !clkdm->clktrctrl_mask)
+ if (!clkdm || !clk)
return -EINVAL;
#ifdef DEBUG
pr_debug("clockdomain: clkdm %s: clk %s now disabled\n", clkdm->name,
clk->name);
+ if (!clkdm->clkstctrl_reg)
+ return 0;
+
v = omap2_clkdm_clktrctrl_read(clkdm);
if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ||
git.openpandora.org / pandora-kernel.git / blobdiff