1 files changed, 85 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/pm_bus.c b/arch/arm/mach-omap2/pm_bus.c
new file mode 100644
index 000000000000..784989f8f2f5
--- /dev/null
+++ b/arch/arm/mach-omap2/pm_bus.c
@@ -0,0 +1,85 @@
+/*
+ * Runtime PM support code for OMAP
+ *
+ * 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 omap_pm_runtime_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        int r, ret = 0;
+
+        dev_dbg(dev, "%s\n", __func__);
+
+        ret = pm_generic_runtime_suspend(dev);
+
+        if (!ret && dev->parent == &omap_device_parent) {
+                r = omap_device_idle(pdev);
+                WARN_ON(r);
+        }
+
+        return ret;
+};
+
+int omap_pm_runtime_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        int r;
+
+        dev_dbg(dev, "%s\n", __func__);
+
+        if (dev->parent == &omap_device_parent) {
+                r = omap_device_enable(pdev);
+                WARN_ON(r);
+        }
+
+        return pm_generic_runtime_resume(dev);
+};
+#else
+#define omap_pm_runtime_suspend NULL
+#define omap_pm_runtime_resume NULL
+#endif /* CONFIG_PM_RUNTIME */
+
+static int __init omap_pm_runtime_init(void)
+{
+        const struct dev_pm_ops *pm;
+        struct dev_pm_ops *omap_pm;
+
+        pm = platform_bus_get_pm_ops();
+        if (!pm) {
+                pr_err("%s: unable to get dev_pm_ops from platform_bus\n",
+                        __func__);
+                return -ENODEV;
+        }
+
+        omap_pm = kmemdup(pm, sizeof(struct dev_pm_ops), GFP_KERNEL);
+        if (!omap_pm) {
+                pr_err("%s: unable to alloc memory for new dev_pm_ops\n",
+                        __func__);
+                return -ENOMEM;
+        }
+
+        omap_pm->runtime_suspend = omap_pm_runtime_suspend;
+        omap_pm->runtime_resume = omap_pm_runtime_resume;
+
+        platform_bus_set_pm_ops(omap_pm);
+
+        return 0;
+}
+core_initcall(omap_pm_runtime_init);