arch/arm/mach-exynos/pm_domains.c

   1 /*
   2  * Exynos Generic power domain support.
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com
   6  *
   7  * Implementation of Exynos specific power domain control which is used in
   8  * conjunction with runtime-pm. Support for both device-tree and non-device-tree
   9  * based power domain support is included.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14 */
  15
  16 #include <linux/io.h>
  17 #include <linux/err.h>
  18 #include <linux/slab.h>
  19 #include <linux/pm_domain.h>
  20 #include <linux/delay.h>
  21 #include <linux/of_address.h>
  22
  23 #include <mach/regs-pmu.h>
  24 #include <plat/devs.h>
  25
  26 /*
  27  * Exynos specific wrapper around the generic power domain
  28  */
  29 struct exynos_pm_domain {
  30         void __iomem *base;
  31         char const *name;
  32         bool is_off;
  33         struct generic_pm_domain pd;
  34 };
  35
  36 static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
  37 {
  38         struct exynos_pm_domain *pd;
  39         void __iomem *base;
  40         u32 timeout, pwr;
  41         char *op;
  42
  43         pd = container_of(domain, struct exynos_pm_domain, pd);
  44         base = pd->base;
  45
  46         pwr = power_on ? S5P_INT_LOCAL_PWR_EN : 0;
  47         __raw_writel(pwr, base);
  48
  49         /* Wait max 1ms */
  50         timeout = 10;
  51
  52         while ((__raw_readl(base + 0x4) & S5P_INT_LOCAL_PWR_EN) != pwr) {
  53                 if (!timeout) {
  54                         op = (power_on) ? "enable" : "disable";
  55                         pr_err("Power domain %s %s failed\n", domain->name, op);
  56                         return -ETIMEDOUT;
  57                 }
  58                 timeout--;
  59                 cpu_relax();
  60                 usleep_range(80, 100);
  61         }
  62         return 0;
  63 }
  64
  65 static int exynos_pd_power_on(struct generic_pm_domain *domain)
  66 {
  67         return exynos_pd_power(domain, true);
  68 }
  69
  70 static int exynos_pd_power_off(struct generic_pm_domain *domain)
  71 {
  72         return exynos_pd_power(domain, false);
  73 }
  74
  75 #define EXYNOS_GPD(PD, BASE, NAME)                      \
  76 static struct exynos_pm_domain PD = {                   \
  77         .base = (void __iomem *)BASE,                   \
  78         .name = NAME,                                   \
  79         .pd = {                                         \
  80                 .power_off = exynos_pd_power_off,       \
  81                 .power_on = exynos_pd_power_on, \
  82         },                                              \
  83 }
  84
  85 #ifdef CONFIG_OF
  86 static __init int exynos_pm_dt_parse_domains(void)
  87 {
  88         struct device_node *np;
  89
  90         for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
  91                 struct exynos_pm_domain *pd;
  92
  93                 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
  94                 if (!pd) {
  95                         pr_err("%s: failed to allocate memory for domain\n",
  96                                         __func__);
  97                         return -ENOMEM;
  98                 }
  99
 100                 if (of_get_property(np, "samsung,exynos4210-pd-off", NULL))
 101                         pd->is_off = true;
 102                 pd->name = np->name;
 103                 pd->base = of_iomap(np, 0);
 104                 pd->pd.power_off = exynos_pd_power_off;
 105                 pd->pd.power_on = exynos_pd_power_on;
 106                 pd->pd.of_node = np;
 107                 pm_genpd_init(&pd->pd, NULL, false);
 108         }
 109         return 0;
 110 }
 111 #else
 112 static __init int exynos_pm_dt_parse_domains(void)
 113 {
 114         return 0;
 115 }
 116 #endif /* CONFIG_OF */
 117
 118 static __init void exynos_pm_add_dev_to_genpd(struct platform_device *pdev,
 119                                                 struct exynos_pm_domain *pd)
 120 {
 121         if (pdev->dev.bus) {
 122                 if (pm_genpd_add_device(&pd->pd, &pdev->dev))
 123                         pr_info("%s: error in adding %s device to %s power"
 124                                 "domain\n", __func__, dev_name(&pdev->dev),
 125                                 pd->name);
 126         }
 127 }
 128
 129 EXYNOS_GPD(exynos4_pd_mfc, S5P_PMU_MFC_CONF, "pd-mfc");
 130 EXYNOS_GPD(exynos4_pd_g3d, S5P_PMU_G3D_CONF, "pd-g3d");
 131 EXYNOS_GPD(exynos4_pd_lcd0, S5P_PMU_LCD0_CONF, "pd-lcd0");
 132 EXYNOS_GPD(exynos4_pd_lcd1, S5P_PMU_LCD1_CONF, "pd-lcd1");
 133 EXYNOS_GPD(exynos4_pd_tv, S5P_PMU_TV_CONF, "pd-tv");
 134 EXYNOS_GPD(exynos4_pd_cam, S5P_PMU_CAM_CONF, "pd-cam");
 135 EXYNOS_GPD(exynos4_pd_gps, S5P_PMU_GPS_CONF, "pd-gps");
 136
 137 static struct exynos_pm_domain *exynos4_pm_domains[] = {
 138         &exynos4_pd_mfc,
 139         &exynos4_pd_g3d,
 140         &exynos4_pd_lcd0,
 141         &exynos4_pd_lcd1,
 142         &exynos4_pd_tv,
 143         &exynos4_pd_cam,
 144         &exynos4_pd_gps,
 145 };
 146
 147 static __init int exynos4_pm_init_power_domain(void)
 148 {
 149         int idx;
 150
 151         if (of_have_populated_dt())
 152                 return exynos_pm_dt_parse_domains();
 153
 154         for (idx = 0; idx < ARRAY_SIZE(exynos4_pm_domains); idx++)
 155                 pm_genpd_init(&exynos4_pm_domains[idx]->pd, NULL,
 156                                 exynos4_pm_domains[idx]->is_off);
 157
 158 #ifdef CONFIG_S5P_DEV_FIMD0
 159         exynos_pm_add_dev_to_genpd(&s5p_device_fimd0, &exynos4_pd_lcd0);
 160 #endif
 161 #ifdef CONFIG_S5P_DEV_TV
 162         exynos_pm_add_dev_to_genpd(&s5p_device_hdmi, &exynos4_pd_tv);
 163         exynos_pm_add_dev_to_genpd(&s5p_device_mixer, &exynos4_pd_tv);
 164 #endif
 165 #ifdef CONFIG_S5P_DEV_MFC
 166         exynos_pm_add_dev_to_genpd(&s5p_device_mfc, &exynos4_pd_mfc);
 167 #endif
 168 #ifdef CONFIG_S5P_DEV_FIMC0
 169         exynos_pm_add_dev_to_genpd(&s5p_device_fimc0, &exynos4_pd_cam);
 170 #endif
 171 #ifdef CONFIG_S5P_DEV_FIMC1
 172         exynos_pm_add_dev_to_genpd(&s5p_device_fimc1, &exynos4_pd_cam);
 173 #endif
 174 #ifdef CONFIG_S5P_DEV_FIMC2
 175         exynos_pm_add_dev_to_genpd(&s5p_device_fimc2, &exynos4_pd_cam);
 176 #endif
 177 #ifdef CONFIG_S5P_DEV_FIMC3
 178         exynos_pm_add_dev_to_genpd(&s5p_device_fimc3, &exynos4_pd_cam);
 179 #endif
 180 #ifdef CONFIG_S5P_DEV_CSIS0
 181         exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis0, &exynos4_pd_cam);
 182 #endif
 183 #ifdef CONFIG_S5P_DEV_CSIS1
 184         exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis1, &exynos4_pd_cam);
 185 #endif
 186 #ifdef CONFIG_S5P_DEV_G2D
 187         exynos_pm_add_dev_to_genpd(&s5p_device_g2d, &exynos4_pd_lcd0);
 188 #endif
 189 #ifdef CONFIG_S5P_DEV_JPEG
 190         exynos_pm_add_dev_to_genpd(&s5p_device_jpeg, &exynos4_pd_cam);
 191 #endif
 192         return 0;
 193 }
 194 arch_initcall(exynos4_pm_init_power_domain);
 195
 196 static __init int exynos_pm_late_initcall(void)
 197 {
 198         pm_genpd_poweroff_unused();
 199         return 0;
 200 }
 201 late_initcall(exynos_pm_late_initcall);