fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / arch / arm / plat-omap / clock.c

diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index 3c2bfc0..f1179ad 100644 (file)
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -11,7 +11,6 @@
  * 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>
@@ -21,15 +20,16 @@
 #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;
 
@@ -37,17 +37,38 @@ 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;
@@ -59,6 +80,9 @@ int clk_enable(struct clk *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);
@@ -72,7 +96,11 @@ void clk_disable(struct clk *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);
@@ -84,6 +112,9 @@ 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);
@@ -97,6 +128,9 @@ unsigned long clk_get_rate(struct clk *clk)
        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);
@@ -121,6 +155,9 @@ 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);
@@ -133,7 +170,10 @@ EXPORT_SYMBOL(clk_round_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)
@@ -147,7 +187,10 @@ EXPORT_SYMBOL(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)
@@ -163,6 +206,9 @@ struct clk *clk_get_parent(struct clk *clk)
        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);
@@ -199,6 +245,9 @@ __setup("mpurate=", omap_clk_setup);
 /* 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;
 }
 
@@ -207,6 +256,9 @@ void propagate_rate(struct clk * tclk)
 {
        struct clk *clkp;
 
+       if (tclk == NULL || IS_ERR(tclk))
+               return;
+
        list_for_each_entry(clkp, &clocks, node) {
                if (likely(clkp->parent != tclk))
                        continue;
@@ -217,6 +269,9 @@ void propagate_rate(struct clk * tclk)
 
 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)
@@ -229,6 +284,9 @@ EXPORT_SYMBOL(clk_register);
 
 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);
@@ -239,6 +297,9 @@ void clk_deny_idle(struct clk *clk)
 {
        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);
@@ -250,6 +311,9 @@ void clk_allow_idle(struct clk *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);
@@ -259,6 +323,31 @@ EXPORT_SYMBOL(clk_allow_idle);
 
 /*-------------------------------------------------------------------------*/
 
+#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) {