arch/arm/mach-exynos4/dev-pd.c

   1 /* linux/arch/arm/mach-exynos4/dev-pd.c
   2  *
   3  * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * EXYNOS4 - Power Domain support
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11 */
  12
  13 #include <linux/io.h>
  14 #include <linux/kernel.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/delay.h>
  17
  18 #include <mach/regs-pmu.h>
  19
  20 #include <plat/pd.h>
  21
  22 static int exynos4_pd_enable(struct device *dev)
  23 {
  24         struct samsung_pd_info *pdata =  dev->platform_data;
  25         u32 timeout;
  26
  27         __raw_writel(S5P_INT_LOCAL_PWR_EN, pdata->base);
  28
  29         /* Wait max 1ms */
  30         timeout = 10;
  31         while ((__raw_readl(pdata->base + 0x4) & S5P_INT_LOCAL_PWR_EN)
  32                 != S5P_INT_LOCAL_PWR_EN) {
  33                 if (timeout == 0) {
  34                         printk(KERN_ERR "Power domain %s enable failed.\n",
  35                                 dev_name(dev));
  36                         return -ETIMEDOUT;
  37                 }
  38                 timeout--;
  39                 udelay(100);
  40         }
  41
  42         return 0;
  43 }
  44
  45 static int exynos4_pd_disable(struct device *dev)
  46 {
  47         struct samsung_pd_info *pdata =  dev->platform_data;
  48         u32 timeout;
  49
  50         __raw_writel(0, pdata->base);
  51
  52         /* Wait max 1ms */
  53         timeout = 10;
  54         while (__raw_readl(pdata->base + 0x4) & S5P_INT_LOCAL_PWR_EN) {
  55                 if (timeout == 0) {
  56                         printk(KERN_ERR "Power domain %s disable failed.\n",
  57                                 dev_name(dev));
  58                         return -ETIMEDOUT;
  59                 }
  60                 timeout--;
  61                 udelay(100);
  62         }
  63
  64         return 0;
  65 }
  66
  67 struct platform_device exynos4_device_pd[] = {
  68         {
  69                 .name           = "samsung-pd",
  70                 .id             = 0,
  71                 .dev = {
  72                         .platform_data = &(struct samsung_pd_info) {
  73                                 .enable         = exynos4_pd_enable,
  74                                 .disable        = exynos4_pd_disable,
  75                                 .base           = S5P_PMU_MFC_CONF,
  76                         },
  77                 },
  78         }, {
  79                 .name           = "samsung-pd",
  80                 .id             = 1,
  81                 .dev = {
  82                         .platform_data = &(struct samsung_pd_info) {
  83                                 .enable         = exynos4_pd_enable,
  84                                 .disable        = exynos4_pd_disable,
  85                                 .base           = S5P_PMU_G3D_CONF,
  86                         },
  87                 },
  88         }, {
  89                 .name           = "samsung-pd",
  90                 .id             = 2,
  91                 .dev = {
  92                         .platform_data = &(struct samsung_pd_info) {
  93                                 .enable         = exynos4_pd_enable,
  94                                 .disable        = exynos4_pd_disable,
  95                                 .base           = S5P_PMU_LCD0_CONF,
  96                         },
  97                 },
  98         }, {
  99                 .name           = "samsung-pd",
 100                 .id             = 3,
 101                 .dev = {
 102                         .platform_data = &(struct samsung_pd_info) {
 103                                 .enable         = exynos4_pd_enable,
 104                                 .disable        = exynos4_pd_disable,
 105                                 .base           = S5P_PMU_LCD1_CONF,
 106                         },
 107                 },
 108         }, {
 109                 .name           = "samsung-pd",
 110                 .id             = 4,
 111                 .dev = {
 112                         .platform_data = &(struct samsung_pd_info) {
 113                                 .enable         = exynos4_pd_enable,
 114                                 .disable        = exynos4_pd_disable,
 115                                 .base           = S5P_PMU_TV_CONF,
 116                         },
 117                 },
 118         }, {
 119                 .name           = "samsung-pd",
 120                 .id             = 5,
 121                 .dev = {
 122                         .platform_data = &(struct samsung_pd_info) {
 123                                 .enable         = exynos4_pd_enable,
 124                                 .disable        = exynos4_pd_disable,
 125                                 .base           = S5P_PMU_CAM_CONF,
 126                         },
 127                 },
 128         }, {
 129                 .name           = "samsung-pd",
 130                 .id             = 6,
 131                 .dev = {
 132                         .platform_data = &(struct samsung_pd_info) {
 133                                 .enable         = exynos4_pd_enable,
 134                                 .disable        = exynos4_pd_disable,
 135                                 .base           = S5P_PMU_GPS_CONF,
 136                         },
 137                 },
 138         },
 139 };