1 files changed, 98 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/pm_bus.c b/arch/arm/mach-omap1/pm_bus.c
new file mode 100644
index 00000000000..8b66392be74
--- /dev/null
+++ b/arch/arm/mach-omap1/pm_bus.c
@@ -0,0 +1,98 @@
+/*
+ * 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 <linux/clk.h>
+#include <linux/err.h>
+
+#include <plat/omap_device.h>
+#include <plat/omap-pm.h>
+
+#ifdef CONFIG_PM_RUNTIME
+static int omap1_pm_runtime_suspend(struct device *dev)
+{
+	struct clk *iclk, *fclk;
+	int ret = 0;
+
+	dev_dbg(dev, "%s\n", __func__);
+
+	ret = pm_generic_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;
+};
+
+static int omap1_pm_runtime_resume(struct device *dev)
+{
+	int ret = 0;
+	struct clk *iclk, *fclk;
+
+	dev_dbg(dev, "%s\n", __func__);
+
+	iclk = clk_get(dev, "ick");
+	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);
+	}
+
+	return pm_generic_runtime_resume(dev);
+};
+
+static int __init omap1_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 = omap1_pm_runtime_suspend;
+	omap_pm->runtime_resume = omap1_pm_runtime_resume;
+
+	platform_bus_set_pm_ops(omap_pm);
+
+	return 0;
+}
+core_initcall(omap1_pm_runtime_init);
+#endif /* CONFIG_PM_RUNTIME */