Merge branch 'master' into tk71

[mv-sheeva.git] / arch / arm / mach-omap2 / pm_bus.c

diff --git a/arch/arm/mach-omap2/pm_bus.c b/arch/arm/mach-omap2/pm_bus.c
new file mode 100644 (file)
index 0000000..5acd2ab
--- /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
+static 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;
+};
+
+static 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);