[PATCH v2 3/3] OMAP1: PM: add simple runtime PM layer to manage clocks

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On OMAP1, we do not have omap_device + omap_hwmod to manage the
device-specific idle, enable and shutdown.  Instead, just
enable/disable device clocks automatically at the runtime PM level.

This allows drivers to not have any OMAP1 specific clock management
and allows them to simply use the runtime PM API to manage clocks.

Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
---
 arch/arm/mach-omap1/Makefile |    2 +-
 arch/arm/mach-omap1/pm_bus.c |   77 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 78 insertions(+), 1 deletions(-)
 create mode 100644 arch/arm/mach-omap1/pm_bus.c

diff --git a/arch/arm/mach-omap1/Makefile b/arch/arm/mach-omap1/Makefile
index ea231c7..fd4df71 100644
--- a/arch/arm/mach-omap1/Makefile
+++ b/arch/arm/mach-omap1/Makefile
@@ -12,7 +12,7 @@ obj-$(CONFIG_OMAP_MPU_TIMER)	+= time.o
 obj-$(CONFIG_OMAP_32K_TIMER)	+= timer32k.o
 
 # Power Management
-obj-$(CONFIG_PM) += pm.o sleep.o
+obj-$(CONFIG_PM) += pm.o sleep.o pm_bus.o
 
 # DSP
 obj-$(CONFIG_OMAP_MBOX_FWK)	+= mailbox_mach.o
diff --git a/arch/arm/mach-omap1/pm_bus.c b/arch/arm/mach-omap1/pm_bus.c
new file mode 100644
index 0000000..29d651a
--- /dev/null
+++ b/arch/arm/mach-omap1/pm_bus.c
@@ -0,0 +1,77 @@
+/*
+ * 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 <plat/omap_device.h>
+#include <plat/omap-pm.h>
+
+#ifdef CONFIG_PM_RUNTIME
+int platform_pm_runtime_suspend(struct device *dev)
+{
+	struct clk *iclk, *fclk;
+
+	dev_dbg(dev, "%s\n", __func__);
+
+	if (dev->driver->pm && dev->driver->pm->runtime_suspend)
+		ret = dev->driver->pm->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;
+};
+
+int platform_pm_runtime_resume(struct device *dev)
+{
+	int r, ret = 0;
+	struct clk *iclk, *fclk;
+
+	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);
+	}
+
+	if (dev->driver->pm && dev->driver->pm->runtime_resume)
+		ret = dev->driver->pm->runtime_resume(dev);
+
+	return ret;
+};
+
+int platform_pm_runtime_idle(struct device *dev)
+{
+	ret = pm_runtime_suspend(dev);
+	dev_dbg(dev, "%s [%d]\n", __func__, ret);
+
+	return 0;
+};
+#endif /* CONFIG_PM_RUNTIME */
-- 
1.7.0.2

--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux