Commit 57e6fe7b authored by Kevin Hilman's avatar Kevin Hilman
Browse files

OMAP2+: PM: initial runtime PM core support 



Implement the new runtime PM framework as a thin layer on top of the
omap_device API.  OMAP specific runtime PM methods are registered with
the as custom methods on the platform_bus.

In order to determine if a device is an omap_device, its parent device
is checked.  All omap_devices have a new 'omap_device_parent_ device
as their parent device, so checking for this parent is used to check
for valid omap_devices.  If a device is an omap_device, then the
appropriate omap_device functions are called for it.  If not, only the
generic runtime PM functions are called.

Device driver's ->runtime_idle() hook is called when the runtime PM
usecount reaches zero for that device.  Driver's ->runtime_suspend()
hooks are called just before the device is disabled (via
omap_device_idle()), and device driver ->runtime_resume() hooks are
called just after device has been enabled (via omap_device_enable().)

OMAP4 build support from Rajendra Nayak <rnayak@ti.com>.
OMAP2 build support from Charulatha V <charu@ti.com>

Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Charulatha V <charu@ti.com>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent b30a3f62

arch/arm/mach-omap2/Makefile

+7 −3
Original line number Diff line number Diff line
@@ -49,14 +49,18 @@ obj-$(CONFIG_ARCH_OMAP2) += sdrc2xxx.o 
# Power Management

ifeq ($(CONFIG_PM),y)

obj-$(CONFIG_ARCH_OMAP2)		+= pm24xx.o

obj-$(CONFIG_ARCH_OMAP2)		+= sleep24xx.o

obj-$(CONFIG_ARCH_OMAP3)		+= pm34xx.o sleep34xx.o cpuidle34xx.o

obj-$(CONFIG_ARCH_OMAP4)		+= pm44xx.o

obj-$(CONFIG_ARCH_OMAP2)		+= sleep24xx.o pm_bus.o

obj-$(CONFIG_ARCH_OMAP3)		+= pm34xx.o sleep34xx.o cpuidle34xx.o pm_bus.o

obj-$(CONFIG_ARCH_OMAP4)		+= pm44xx.o pm_bus.o

obj-$(CONFIG_PM_DEBUG)			+= pm-debug.o



AFLAGS_sleep24xx.o			:=-Wa,-march=armv6

AFLAGS_sleep34xx.o			:=-Wa,-march=armv7-a



ifeq ($(CONFIG_PM_VERBOSE),y)

CFLAGS_pm_bus.o				+= -DDEBUG

endif



endif



# PRCM

arch/arm/mach-omap2/pm_bus.c

0 → 100644
+85 −0
Original line number Diff line number Diff line 
/*

 * 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

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;

};



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);

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