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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/mach-exynos4/dev-pd.c
10817 views
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/* linux/arch/arm/mach-exynos4/dev-pd.c

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 *

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 * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.

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 *		http://www.samsung.com

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 *

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 * EXYNOS4 - Power Domain support

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 *

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License version 2 as

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 * published by the Free Software Foundation.

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*/

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#include <linux/io.h>

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#include <linux/kernel.h>

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#include <linux/platform_device.h>

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#include <linux/delay.h>

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#include <mach/regs-pmu.h>

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#include <plat/pd.h>

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static int exynos4_pd_enable(struct device *dev)

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{

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	struct samsung_pd_info *pdata =  dev->platform_data;

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	u32 timeout;

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	__raw_writel(S5P_INT_LOCAL_PWR_EN, pdata->base);

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	/* Wait max 1ms */

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	timeout = 10;

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	while ((__raw_readl(pdata->base + 0x4) & S5P_INT_LOCAL_PWR_EN)

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		!= S5P_INT_LOCAL_PWR_EN) {

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		if (timeout == 0) {

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			printk(KERN_ERR "Power domain %s enable failed.\n",

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				dev_name(dev));

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			return -ETIMEDOUT;

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		}

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		timeout--;

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		udelay(100);

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	}

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	return 0;

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}

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static int exynos4_pd_disable(struct device *dev)

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{

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	struct samsung_pd_info *pdata =  dev->platform_data;

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	u32 timeout;

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	__raw_writel(0, pdata->base);

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	/* Wait max 1ms */

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	timeout = 10;

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	while (__raw_readl(pdata->base + 0x4) & S5P_INT_LOCAL_PWR_EN) {

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		if (timeout == 0) {

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			printk(KERN_ERR "Power domain %s disable failed.\n",

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				dev_name(dev));

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			return -ETIMEDOUT;

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		}

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		timeout--;

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		udelay(100);

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	}

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	return 0;

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}

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struct platform_device exynos4_device_pd[] = {

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	{

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		.name		= "samsung-pd",

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		.id		= 0,

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		.dev = {

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			.platform_data = &(struct samsung_pd_info) {

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				.enable		= exynos4_pd_enable,

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				.disable	= exynos4_pd_disable,

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				.base		= S5P_PMU_MFC_CONF,

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			},

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		},

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	}, {

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		.name		= "samsung-pd",

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		.id		= 1,

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		.dev = {

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			.platform_data = &(struct samsung_pd_info) {

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				.enable		= exynos4_pd_enable,

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				.disable	= exynos4_pd_disable,

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				.base		= S5P_PMU_G3D_CONF,

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			},

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		},

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	}, {

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		.name		= "samsung-pd",

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		.id		= 2,

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		.dev = {

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			.platform_data = &(struct samsung_pd_info) {

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				.enable		= exynos4_pd_enable,

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				.disable	= exynos4_pd_disable,

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				.base		= S5P_PMU_LCD0_CONF,

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			},

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		},

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	}, {

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		.name		= "samsung-pd",

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		.id		= 3,

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		.dev = {

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			.platform_data = &(struct samsung_pd_info) {

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				.enable		= exynos4_pd_enable,

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				.disable	= exynos4_pd_disable,

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				.base		= S5P_PMU_LCD1_CONF,

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			},

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		},

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	}, {

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		.name		= "samsung-pd",

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		.id		= 4,

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		.dev = {

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			.platform_data = &(struct samsung_pd_info) {

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				.enable		= exynos4_pd_enable,

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				.disable	= exynos4_pd_disable,

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				.base		= S5P_PMU_TV_CONF,

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			},

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		},

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	}, {

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		.name		= "samsung-pd",

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		.id		= 5,

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		.dev = {

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			.platform_data = &(struct samsung_pd_info) {

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				.enable		= exynos4_pd_enable,

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				.disable	= exynos4_pd_disable,

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				.base		= S5P_PMU_CAM_CONF,

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			},

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		},

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	}, {

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		.name		= "samsung-pd",

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		.id		= 6,

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		.dev = {

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			.platform_data = &(struct samsung_pd_info) {

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				.enable		= exynos4_pd_enable,

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				.disable	= exynos4_pd_disable,

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				.base		= S5P_PMU_GPS_CONF,

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			},

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		},

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	},

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};

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