OMAP1: PM: add simple runtime PM layer to manage clocks

Commit Message

Kevin Hilman June 17, 2010, 11:08 p.m. UTC

None

Patch

diff --git a/arch/arm/mach-omap1/Makefile b/arch/arm/mach-omap1/Makefile
index ea231c7..fd4df71 100644
--- a/arch/arm/mach-omap1/Makefile
+++ b/arch/arm/mach-omap1/Makefile
@@ -12,7 +12,7 @@  obj-$(CONFIG_OMAP_MPU_TIMER)	+= time.o
 obj-$(CONFIG_OMAP_32K_TIMER)	+= timer32k.o
 
 # Power Management
-obj-$(CONFIG_PM) += pm.o sleep.o
+obj-$(CONFIG_PM) += pm.o sleep.o pm_bus.o
 
 # DSP
 obj-$(CONFIG_OMAP_MBOX_FWK)	+= mailbox_mach.o
diff --git a/arch/arm/mach-omap1/pm_bus.c b/arch/arm/mach-omap1/pm_bus.c
new file mode 100644
index 0000000..46a34fc
--- /dev/null
+++ b/arch/arm/mach-omap1/pm_bus.c
@@ -0,0 +1,77 @@ 
+/*
+ * Runtime PM support code for OMAP1
+ *
+ * Author: Kevin Hilman, Deep Root Systems, LLC
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+
+#include <plat/omap_device.h>
+#include <plat/omap-pm.h>
+
+#ifdef CONFIG_PM_RUNTIME
+int platform_pm_runtime_suspend(struct device *dev)
+{
+	struct clk *iclk, *fclk;
+
+	dev_dbg(dev, "%s\n", __func__);
+
+	if (dev->driver->pm && dev->driver->pm->runtime_suspend)
+		ret = dev->driver->pm->runtime_suspend(dev);
+
+	fclk = clk_get(dev, "fck");
+	if (!IS_ERR(fclk)) {
+		clk_disable(fclk);
+		clk_put(fclk);
+	}
+
+	iclk = clk_get(dev, "ick");
+	if (!IS_ERR(iclk)) {
+		clk_disable(iclk);
+		clk_put(iclk);
+	}
+
+	return 0;
+};
+
+int platform_pm_runtime_resume(struct device *dev)
+{
+	int r, ret = 0;
+	struct clk *iclk, *fclk;
+
+	iclk = clk_get(dev, "fck");
+	if (!IS_ERR(iclk)) {
+		clk_enable(iclk);
+		clk_put(iclk);
+	}
+
+	fclk = clk_get(dev, "fck");
+	if (!IS_ERR(fclk)) {
+		clk_enable(fclk);
+		clk_put(fclk);
+	}
+
+	if (dev->driver->pm && dev->driver->pm->runtime_resume)
+		ret = dev->driver->pm->runtime_resume(dev);
+
+	return ret;
+};
+
+int platform_pm_runtime_idle(struct device *dev)
+{
+	ret = pm_runtime_suspend(dev);
+	dev_dbg(dev, "%s [%d]\n", __func__, ret);
+
+	return 0;
+};
+#endif /* CONFIG_PM_RUNTIME */