* published by the Free Software Foundation.
*/
#include <linux/version.h>
-#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/clk.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/semaphore.h>
#include <asm/arch/clock.h>
-LIST_HEAD(clocks);
-static DECLARE_MUTEX(clocks_sem);
-DEFINE_SPINLOCK(clockfw_lock);
+static LIST_HEAD(clocks);
+static DEFINE_MUTEX(clocks_mutex);
+static DEFINE_SPINLOCK(clockfw_lock);
static struct clk_functions *arch_clock;
+#ifdef CONFIG_PM_DEBUG
+
+static void print_parents(struct clk *clk)
+{
+ struct clk *p;
+ int printed = 0;
+
+ list_for_each_entry(p, &clocks, node) {
+ if (p->parent == clk && p->usecount) {
+ if (!clk->usecount && !printed) {
+ printk("MISMATCH: %s\n", clk->name);
+ printed = 1;
+ }
+ printk("\t%-15s\n", p->name);
+ }
+ }
+}
+
+void clk_print_usecounts(void)
+{
+ unsigned long flags;
+ struct clk *p;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ list_for_each_entry(p, &clocks, node) {
+ if (p->usecount)
+ printk("%-15s: %d\n", p->name, p->usecount);
+ print_parents(p);
+
+ }
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+
+#endif
+
/*-------------------------------------------------------------------------
- * Standard clock functions defined in asm/hardware/clock.h
+ * Standard clock functions defined in include/linux/clk.h
*-------------------------------------------------------------------------*/
+/*
+ * Returns a clock. Note that we first try to use device id on the bus
+ * and clock name. If this fails, we try to use clock name only.
+ */
struct clk * clk_get(struct device *dev, const char *id)
{
struct clk *p, *clk = ERR_PTR(-ENOENT);
+ int idno;
+
+ if (dev == NULL || dev->bus != &platform_bus_type)
+ idno = -1;
+ else
+ idno = to_platform_device(dev)->id;
+
+ mutex_lock(&clocks_mutex);
+
+ list_for_each_entry(p, &clocks, node) {
+ if (p->id == idno &&
+ strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
+ clk = p;
+ goto found;
+ }
+ }
- down(&clocks_sem);
list_for_each_entry(p, &clocks, node) {
if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
clk = p;
break;
}
}
- up(&clocks_sem);
+
+found:
+ mutex_unlock(&clocks_mutex);
return clk;
}
unsigned long flags;
int ret = 0;
+ if (clk == NULL || IS_ERR(clk))
+ return -EINVAL;
+
spin_lock_irqsave(&clockfw_lock, flags);
- if (clk->enable)
- ret = clk->enable(clk);
- else if (arch_clock->clk_enable)
+ if (arch_clock->clk_enable)
ret = arch_clock->clk_enable(clk);
- else
- printk(KERN_ERR "Could not enable clock %s\n", clk->name);
spin_unlock_irqrestore(&clockfw_lock, flags);
return ret;
{
unsigned long flags;
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
spin_lock_irqsave(&clockfw_lock, flags);
- if (clk->disable)
- clk->disable(clk);
- else if (arch_clock->clk_disable)
+ BUG_ON(clk->usecount == 0);
+ if (arch_clock->clk_disable)
arch_clock->clk_disable(clk);
- else
- printk(KERN_ERR "Could not disable clock %s\n", clk->name);
spin_unlock_irqrestore(&clockfw_lock, flags);
}
EXPORT_SYMBOL(clk_disable);
-int clk_use(struct clk *clk)
-{
- unsigned long flags;
- int ret = 0;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- if (arch_clock->clk_use)
- ret = arch_clock->clk_use(clk);
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL(clk_use);
-
-void clk_unuse(struct clk *clk)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- if (arch_clock->clk_unuse)
- arch_clock->clk_unuse(clk);
- spin_unlock_irqrestore(&clockfw_lock, flags);
-}
-EXPORT_SYMBOL(clk_unuse);
-
int clk_get_usecount(struct clk *clk)
{
unsigned long flags;
int ret = 0;
+ if (clk == NULL || IS_ERR(clk))
+ return 0;
+
spin_lock_irqsave(&clockfw_lock, flags);
ret = clk->usecount;
spin_unlock_irqrestore(&clockfw_lock, flags);
unsigned long flags;
unsigned long ret = 0;
+ if (clk == NULL || IS_ERR(clk))
+ return 0;
+
spin_lock_irqsave(&clockfw_lock, flags);
ret = clk->rate;
spin_unlock_irqrestore(&clockfw_lock, flags);
EXPORT_SYMBOL(clk_put);
/*-------------------------------------------------------------------------
- * Optional clock functions defined in asm/hardware/clock.h
+ * Optional clock functions defined in include/linux/clk.h
*-------------------------------------------------------------------------*/
long clk_round_rate(struct clk *clk, unsigned long rate)
unsigned long flags;
long ret = 0;
+ if (clk == NULL || IS_ERR(clk))
+ return ret;
+
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_round_rate)
ret = arch_clock->clk_round_rate(clk, rate);
int clk_set_rate(struct clk *clk, unsigned long rate)
{
unsigned long flags;
- int ret = 0;
+ int ret = -EINVAL;
+
+ if (clk == NULL || IS_ERR(clk))
+ return ret;
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_set_rate)
int clk_set_parent(struct clk *clk, struct clk *parent)
{
unsigned long flags;
- int ret = 0;
+ int ret = -EINVAL;
+
+ if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent))
+ return ret;
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_set_parent)
unsigned long flags;
struct clk * ret = NULL;
+ if (clk == NULL || IS_ERR(clk))
+ return ret;
+
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_get_parent)
ret = arch_clock->clk_get_parent(clk);
/* Used for clocks that always have same value as the parent clock */
void followparent_recalc(struct clk *clk)
{
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
clk->rate = clk->parent->rate;
+ if (unlikely(clk->flags & RATE_PROPAGATES))
+ propagate_rate(clk);
}
/* Propagate rate to children */
{
struct clk *clkp;
+ if (tclk == NULL || IS_ERR(tclk))
+ return;
+
list_for_each_entry(clkp, &clocks, node) {
if (likely(clkp->parent != tclk))
continue;
int clk_register(struct clk *clk)
{
- down(&clocks_sem);
+ if (clk == NULL || IS_ERR(clk))
+ return -EINVAL;
+
+ mutex_lock(&clocks_mutex);
list_add(&clk->node, &clocks);
if (clk->init)
clk->init(clk);
- up(&clocks_sem);
+ mutex_unlock(&clocks_mutex);
return 0;
}
void clk_unregister(struct clk *clk)
{
- down(&clocks_sem);
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
+ mutex_lock(&clocks_mutex);
list_del(&clk->node);
- up(&clocks_sem);
+ mutex_unlock(&clocks_mutex);
}
EXPORT_SYMBOL(clk_unregister);
{
unsigned long flags;
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_deny_idle)
arch_clock->clk_deny_idle(clk);
{
unsigned long flags;
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
spin_lock_irqsave(&clockfw_lock, flags);
if (arch_clock->clk_allow_idle)
arch_clock->clk_allow_idle(clk);
/*-------------------------------------------------------------------------*/
+#ifdef CONFIG_OMAP_RESET_CLOCKS
+/*
+ * Disable any unused clocks left on by the bootloader
+ */
+static int __init clk_disable_unused(void)
+{
+ struct clk *ck;
+ unsigned long flags;
+
+ list_for_each_entry(ck, &clocks, node) {
+ if (ck->usecount > 0 || (ck->flags & ALWAYS_ENABLED) ||
+ ck->enable_reg == 0)
+ continue;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ if (arch_clock->clk_disable_unused)
+ arch_clock->clk_disable_unused(ck);
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+ }
+
+ return 0;
+}
+late_initcall(clk_disable_unused);
+#endif
+
int __init clk_init(struct clk_functions * custom_clocks)
{
if (!custom_clocks) {
projects / linux-2.6-omap-h63xx.git / blobdiff