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Commit d930596a authored by Changhwan Youn's avatar Changhwan Youn Committed by Kukjin Kim
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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: default avatarKukjin Kim <kgene.kim@samsung.com>
parent df3d0296

arch/arm/plat-samsung/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -333,4 +333,12 @@ config SAMSUNG_WAKEMASK 
	  and above. This code allows a set of interrupt to wakeup-mask

	  mappings. See <plat/wakeup-mask.h>



comment "Power Domain"



config SAMSUNG_PD

	bool "Samsung Power Domain"

	depends on PM_RUNTIME

	help

	  Say Y here if you want to control Power Domain by Runtime PM.



endif

arch/arm/plat-samsung/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -73,6 +73,10 @@ obj-$(CONFIG_SAMSUNG_PM_CHECK) += pm-check.o 


obj-$(CONFIG_SAMSUNG_WAKEMASK)	+= wakeup-mask.o



# PD support



obj-$(CONFIG_SAMSUNG_PD)	+= pd.o



# PWM support



obj-$(CONFIG_HAVE_PWM)		+= pwm.o

arch/arm/plat-samsung/include/plat/pd.h

0 → 100644
+30 −0
Original line number Diff line number Diff line 
/* linux/arch/arm/plat-samsung/include/plat/pd.h

 *

 * Copyright (c) 2010 Samsung Electronics Co., Ltd.

 *		http://www.samsung.com

 *

 * 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.

*/



#ifndef __ASM_PLAT_SAMSUNG_PD_H

#define __ASM_PLAT_SAMSUNG_PD_H __FILE__



struct samsung_pd_info {

	int (*enable)(struct device *dev);

	int (*disable)(struct device *dev);

	void __iomem *base;

};



enum s5pv310_pd_block {

	PD_MFC,

	PD_G3D,

	PD_LCD0,

	PD_LCD1,

	PD_TV,

	PD_CAM,

	PD_GPS

};



#endif /* __ASM_PLAT_SAMSUNG_PD_H */

arch/arm/plat-samsung/pd.c

0 → 100644
+95 −0
Original line number Diff line number Diff line 
/* 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);