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Diffstat (limited to 'arch/arm/mach-keystone/pm_domain.c')
-rw-r--r--arch/arm/mach-keystone/pm_domain.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/arch/arm/mach-keystone/pm_domain.c b/arch/arm/mach-keystone/pm_domain.c
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index 00000000000..29625232e95
--- /dev/null
+++ b/arch/arm/mach-keystone/pm_domain.c
@@ -0,0 +1,82 @@
+/*
+ * PM domain driver for Keystone2 devices
+ *
+ * Copyright 2013 Texas Instruments, Inc.
+ * Santosh Shilimkar <santosh.shillimkar@ti.com>
+ *
+ * Based on Kevins work on DAVINCI SOCs
+ * Kevin Hilman <khilman@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm_clock.h>
+#include <linux/platform_device.h>
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+
+#ifdef CONFIG_PM_RUNTIME
+static int keystone_pm_runtime_suspend(struct device *dev)
+{
+ int ret;
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ ret = pm_generic_runtime_suspend(dev);
+ if (ret)
+ return ret;
+
+ ret = pm_clk_suspend(dev);
+ if (ret) {
+ pm_generic_runtime_resume(dev);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int keystone_pm_runtime_resume(struct device *dev)
+{
+ dev_dbg(dev, "%s\n", __func__);
+
+ pm_clk_resume(dev);
+
+ return pm_generic_runtime_resume(dev);
+}
+#endif
+
+static struct dev_pm_domain keystone_pm_domain = {
+ .ops = {
+ SET_RUNTIME_PM_OPS(keystone_pm_runtime_suspend,
+ keystone_pm_runtime_resume, NULL)
+ USE_PLATFORM_PM_SLEEP_OPS
+ },
+};
+
+static struct pm_clk_notifier_block platform_domain_notifier = {
+ .pm_domain = &keystone_pm_domain,
+};
+
+static struct of_device_id of_keystone_table[] = {
+ {.compatible = "ti,keystone"},
+ { /* end of list */ },
+};
+
+int __init keystone_pm_runtime_init(void)
+{
+ struct device_node *np;
+
+ np = of_find_matching_node(NULL, of_keystone_table);
+ if (!np)
+ return 0;
+
+ of_clk_init(NULL);
+ pm_clk_add_notifier(&platform_bus_type, &platform_domain_notifier);
+
+ return 0;
+}
+subsys_initcall(keystone_pm_runtime_init);