summaryrefslogtreecommitdiffstats
path: root/arch/sh/kernel/cpu/clock.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/kernel/cpu/clock.c')
-rw-r--r--arch/sh/kernel/cpu/clock.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/clock.c b/arch/sh/kernel/cpu/clock.c
index 7b17137536d6..1dc896483b59 100644
--- a/arch/sh/kernel/cpu/clock.c
+++ b/arch/sh/kernel/cpu/clock.c
@@ -20,6 +20,8 @@
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/kref.h>
+#include <linux/kobject.h>
+#include <linux/sysdev.h>
#include <linux/seq_file.h>
#include <linux/err.h>
#include <linux/platform_device.h>
@@ -239,6 +241,35 @@ void clk_recalc_rate(struct clk *clk)
}
EXPORT_SYMBOL_GPL(clk_recalc_rate);
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+ int ret = -EINVAL;
+ struct clk *old;
+
+ if (!parent || !clk)
+ return ret;
+
+ old = clk->parent;
+ if (likely(clk->ops && clk->ops->set_parent)) {
+ unsigned long flags;
+ spin_lock_irqsave(&clock_lock, flags);
+ ret = clk->ops->set_parent(clk, parent);
+ spin_unlock_irqrestore(&clock_lock, flags);
+ clk->parent = (ret ? old : parent);
+ }
+
+ if (unlikely(clk->flags & CLK_RATE_PROPAGATES))
+ propagate_rate(clk);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(clk_set_parent);
+
+struct clk *clk_get_parent(struct clk *clk)
+{
+ return clk->parent;
+}
+EXPORT_SYMBOL_GPL(clk_get_parent);
+
long clk_round_rate(struct clk *clk, unsigned long rate)
{
if (likely(clk->ops && clk->ops->round_rate)) {
@@ -329,6 +360,70 @@ static int show_clocks(char *buf, char **start, off_t off,
return p - buf;
}
+#ifdef CONFIG_PM
+static int clks_sysdev_suspend(struct sys_device *dev, pm_message_t state)
+{
+ static pm_message_t prev_state;
+ struct clk *clkp;
+
+ switch (state.event) {
+ case PM_EVENT_ON:
+ /* Resumeing from hibernation */
+ if (prev_state.event == PM_EVENT_FREEZE) {
+ list_for_each_entry(clkp, &clock_list, node)
+ if (likely(clkp->ops)) {
+ unsigned long rate = clkp->rate;
+
+ if (likely(clkp->ops->set_parent))
+ clkp->ops->set_parent(clkp,
+ clkp->parent);
+ if (likely(clkp->ops->set_rate))
+ clkp->ops->set_rate(clkp,
+ rate, NO_CHANGE);
+ else if (likely(clkp->ops->recalc))
+ clkp->ops->recalc(clkp);
+ }
+ }
+ break;
+ case PM_EVENT_FREEZE:
+ break;
+ case PM_EVENT_SUSPEND:
+ break;
+ }
+
+ prev_state = state;
+ return 0;
+}
+
+static int clks_sysdev_resume(struct sys_device *dev)
+{
+ return clks_sysdev_suspend(dev, PMSG_ON);
+}
+
+static struct sysdev_class clks_sysdev_class = {
+ .name = "clks",
+};
+
+static struct sysdev_driver clks_sysdev_driver = {
+ .suspend = clks_sysdev_suspend,
+ .resume = clks_sysdev_resume,
+};
+
+static struct sys_device clks_sysdev_dev = {
+ .cls = &clks_sysdev_class,
+};
+
+static int __init clk_sysdev_init(void)
+{
+ sysdev_class_register(&clks_sysdev_class);
+ sysdev_driver_register(&clks_sysdev_class, &clks_sysdev_driver);
+ sysdev_register(&clks_sysdev_dev);
+
+ return 0;
+}
+subsys_initcall(clk_sysdev_init);
+#endif
+
int __init clk_init(void)
{
int i, ret = 0;