ARM: SAMSUNG: Add support for Power Domain control
This patch implements Power Domain control based on Runtime PM framework.
Each Power Domain is represented by a Power Domain device and the devices
belong to these Power Domains should be set as a child device of the Power
Domain devices. The corresponding drivers of the devices should implement
Runtime PM to control the Power Domains.
Signed-off-by: Changhwan Youn <chaos.youn at samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/plat-samsung/pd.c b/arch/arm/plat-samsung/pd.c
new file mode 100644
index 0000000..efe1d56
--- /dev/null
+++ b/arch/arm/plat-samsung/pd.c
@@ -0,0 +1,95 @@
+/* linux/arch/arm/plat-samsung/pd.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Samsung Power domain support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+
+#include <plat/pd.h>
+
+static int samsung_pd_probe(struct platform_device *pdev)
+{
+ struct samsung_pd_info *pdata = pdev->dev.platform_data;
+ struct device *dev = &pdev->dev;
+
+ if (!pdata) {
+ dev_err(dev, "no device data specified\n");
+ return -ENOENT;
+ }
+
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ dev_info(dev, "power domain registered\n");
+ return 0;
+}
+
+static int __devexit samsung_pd_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ pm_runtime_disable(dev);
+ return 0;
+}
+
+static int samsung_pd_runtime_suspend(struct device *dev)
+{
+ struct samsung_pd_info *pdata = dev->platform_data;
+ int ret = 0;
+
+ if (pdata->disable)
+ ret = pdata->disable(dev);
+
+ dev_dbg(dev, "suspended\n");
+ return ret;
+}
+
+static int samsung_pd_runtime_resume(struct device *dev)
+{
+ struct samsung_pd_info *pdata = dev->platform_data;
+ int ret = 0;
+
+ if (pdata->enable)
+ ret = pdata->enable(dev);
+
+ dev_dbg(dev, "resumed\n");
+ return ret;
+}
+
+static const struct dev_pm_ops samsung_pd_pm_ops = {
+ .runtime_suspend = samsung_pd_runtime_suspend,
+ .runtime_resume = samsung_pd_runtime_resume,
+};
+
+static struct platform_driver samsung_pd_driver = {
+ .driver = {
+ .name = "samsung-pd",
+ .owner = THIS_MODULE,
+ .pm = &samsung_pd_pm_ops,
+ },
+ .probe = samsung_pd_probe,
+ .remove = __devexit_p(samsung_pd_remove),
+};
+
+static int __init samsung_pd_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&samsung_pd_driver);
+ if (ret)
+ printk(KERN_ERR "%s: failed to add PD driver\n", __func__);
+
+ return ret;
+}
+arch_initcall(samsung_pd_init);