* 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/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 LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);
-DEFINE_SPINLOCK(clockfw_lock);
+static DEFINE_SPINLOCK(clockfw_lock);
static struct clk_functions *arch_clock;
* 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;
+ }
+ }
+
list_for_each_entry(p, &clocks, node) {
if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
clk = p;
break;
}
}
+
+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 (arch_clock->clk_enable)
ret = arch_clock->clk_enable(clk);
{
unsigned long flags;
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
spin_lock_irqsave(&clockfw_lock, flags);
+ BUG_ON(clk->usecount == 0);
if (arch_clock->clk_disable)
arch_clock->clk_disable(clk);
spin_unlock_irqrestore(&clockfw_lock, flags);
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);
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;
}
{
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)
{
+ if (clk == NULL || IS_ERR(clk))
+ return -EINVAL;
+
mutex_lock(&clocks_mutex);
list_add(&clk->node, &clocks);
if (clk->init)
void clk_unregister(struct clk *clk)
{
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
mutex_lock(&clocks_mutex);
list_del(&clk->node);
mutex_unlock(&clocks_mutex);
{
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) {