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authorFrancesco VIRLINZI <francesco.virlinzi@st.com>2009-03-11 07:42:05 +0000
committerPaul Mundt <lethal@linux-sh.org>2009-03-11 17:18:50 +0900
commit4a55026fd7a08074676e87932578ff9e327e82a3 (patch)
tree1440f7034dcc4c18e1d82fbc53ebf82509d066c5 /arch/sh/kernel
parentd680c76eccd9222031ee30dcee5fdedba2467610 (diff)
downloadblackbird-op-linux-4a55026fd7a08074676e87932578ff9e327e82a3.tar.gz
blackbird-op-linux-4a55026fd7a08074676e87932578ff9e327e82a3.zip
sh: clkfwk: Add resume from hibernation support.
This patch adds PM support to the clock framework. With this, resume from hibernation is properly supported. Signed-off-by: Francesco Virlinzi <francesco.virlinzi@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel')
-rw-r--r--arch/sh/kernel/cpu/clock.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/clock.c b/arch/sh/kernel/cpu/clock.c
index 332a1798547c..3209a8740fa4 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>
@@ -358,6 +360,68 @@ 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)) {
+ if (likely(clkp->ops->set_parent))
+ clkp->ops->set_parent(clkp,
+ clkp->parent);
+ if (likely(clkp->ops->set_rate))
+ clkp->ops->set_rate(clkp,
+ 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;
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