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 #include <linux/of_platform.h>
  23 #include <linux/sched.h>
  24
  25 #include <mach/regs-pmu.h>
  26 #include <plat/devs.h>
  27
  28 /*
  29  * Exynos specific wrapper around the generic power domain
  30  */
  31 struct exynos_pm_domain {
  32         void __iomem *base;
  33         char const *name;
  34         bool is_off;
  35         struct generic_pm_domain pd;
  36 };
  37
  38 static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
  39 {
  40         struct exynos_pm_domain *pd;
  41         void __iomem *base;
  42         u32 timeout, pwr;
  43         char *op;
  44
  45         pd = container_of(domain, struct exynos_pm_domain, pd);
  46         base = pd->base;
  47
  48         pwr = power_on ? S5P_INT_LOCAL_PWR_EN : 0;
  49         __raw_writel(pwr, base);
  50
  51         /* Wait max 1ms */
  52         timeout = 10;
  53
  54         while ((__raw_readl(base + 0x4) & S5P_INT_LOCAL_PWR_EN) != pwr) {
  55                 if (!timeout) {
  56                         op = (power_on) ? "enable" : "disable";
  57                         pr_err("Power domain %s %s failed\n", domain->name, op);
  58                         return -ETIMEDOUT;
  59                 }
  60                 timeout--;
  61                 cpu_relax();
  62                 usleep_range(80, 100);
  63         }
  64         return 0;
  65 }
  66
  67 static int exynos_pd_power_on(struct generic_pm_domain *domain)
  68 {
  69         return exynos_pd_power(domain, true);
  70 }
  71
  72 static int exynos_pd_power_off(struct generic_pm_domain *domain)
  73 {
  74         return exynos_pd_power(domain, false);
  75 }
  76
  77 #define EXYNOS_GPD(PD, BASE, NAME)                      \
  78 static struct exynos_pm_domain PD = {                   \
  79         .base = (void __iomem *)BASE,                   \
  80         .name = NAME,                                   \
  81         .pd = {                                         \
  82                 .power_off = exynos_pd_power_off,       \
  83                 .power_on = exynos_pd_power_on, \
  84         },                                              \
  85 }
  86
  87 #ifdef CONFIG_OF
  88 static void exynos_add_device_to_domain(struct exynos_pm_domain *pd,
  89                                          struct device *dev)
  90 {
  91         int ret;
  92
  93         dev_dbg(dev, "adding to power domain %s\n", pd->pd.name);
  94
  95         while (1) {
  96                 ret = pm_genpd_add_device(&pd->pd, dev);
  97                 if (ret != -EAGAIN)
  98                         break;
  99                 cond_resched();
 100         }
 101
 102         pm_genpd_dev_need_restore(dev, true);
 103 }
 104
 105 static void exynos_remove_device_from_domain(struct device *dev)
 106 {
 107         struct generic_pm_domain *genpd = dev_to_genpd(dev);
 108         int ret;
 109
 110         dev_dbg(dev, "removing from power domain %s\n", genpd->name);
 111
 112         while (1) {
 113                 ret = pm_genpd_remove_device(genpd, dev);
 114                 if (ret != -EAGAIN)
 115                         break;
 116                 cond_resched();
 117         }
 118 }
 119
 120 static void exynos_read_domain_from_dt(struct device *dev)
 121 {
 122         struct platform_device *pd_pdev;
 123         struct exynos_pm_domain *pd;
 124         struct device_node *node;
 125
 126         node = of_parse_phandle(dev->of_node, "samsung,power-domain", 0);
 127         if (!node)
 128                 return;
 129         pd_pdev = of_find_device_by_node(node);
 130         if (!pd_pdev)
 131                 return;
 132         pd = platform_get_drvdata(pd_pdev);
 133         exynos_add_device_to_domain(pd, dev);
 134 }
 135
 136 static int exynos_pm_notifier_call(struct notifier_block *nb,
 137                                     unsigned long event, void *data)
 138 {
 139         struct device *dev = data;
 140
 141         switch (event) {
 142         case BUS_NOTIFY_BIND_DRIVER:
 143                 if (dev->of_node)
 144                         exynos_read_domain_from_dt(dev);
 145
 146                 break;
 147
 148         case BUS_NOTIFY_UNBOUND_DRIVER:
 149                 exynos_remove_device_from_domain(dev);
 150
 151                 break;
 152         }
 153         return NOTIFY_DONE;
 154 }
 155
 156 static struct notifier_block platform_nb = {
 157         .notifier_call = exynos_pm_notifier_call,
 158 };
 159
 160 static __init int exynos_pm_dt_parse_domains(void)
 161 {
 162         struct platform_device *pdev;
 163         struct device_node *np;
 164
 165         for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
 166                 struct exynos_pm_domain *pd;
 167                 int on;
 168
 169                 pdev = of_find_device_by_node(np);
 170
 171                 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 172                 if (!pd) {
 173                         pr_err("%s: failed to allocate memory for domain\n",
 174                                         __func__);
 175                         return -ENOMEM;
 176                 }
 177
 178                 pd->pd.name = kstrdup(np->name, GFP_KERNEL);
 179                 pd->name = pd->pd.name;
 180                 pd->base = of_iomap(np, 0);
 181                 pd->pd.power_off = exynos_pd_power_off;
 182                 pd->pd.power_on = exynos_pd_power_on;
 183                 pd->pd.of_node = np;
 184
 185                 platform_set_drvdata(pdev, pd);
 186
 187                 on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
 188
 189                 pm_genpd_init(&pd->pd, NULL, !on);
 190         }
 191
 192         bus_register_notifier(&platform_bus_type, &platform_nb);
 193
 194         return 0;
 195 }
 196 #else
 197 static __init int exynos_pm_dt_parse_domains(void)
 198 {
 199         return 0;
 200 }
 201 #endif /* CONFIG_OF */
 202
 203 static __init __maybe_unused void exynos_pm_add_dev_to_genpd(struct platform_device *pdev,
 204                                                 struct exynos_pm_domain *pd)
 205 {
 206         if (pdev->dev.bus) {
 207                 if (!pm_genpd_add_device(&pd->pd, &pdev->dev))
 208                         pm_genpd_dev_need_restore(&pdev->dev, true);
 209                 else
 210                         pr_info("%s: error in adding %s device to %s power"
 211                                 "domain\n", __func__, dev_name(&pdev->dev),
 212                                 pd->name);
 213         }
 214 }
 215
 216 EXYNOS_GPD(exynos4_pd_mfc, S5P_PMU_MFC_CONF, "pd-mfc");
 217 EXYNOS_GPD(exynos4_pd_g3d, S5P_PMU_G3D_CONF, "pd-g3d");
 218 EXYNOS_GPD(exynos4_pd_lcd0, S5P_PMU_LCD0_CONF, "pd-lcd0");
 219 EXYNOS_GPD(exynos4_pd_lcd1, S5P_PMU_LCD1_CONF, "pd-lcd1");
 220 EXYNOS_GPD(exynos4_pd_tv, S5P_PMU_TV_CONF, "pd-tv");
 221 EXYNOS_GPD(exynos4_pd_cam, S5P_PMU_CAM_CONF, "pd-cam");
 222 EXYNOS_GPD(exynos4_pd_gps, S5P_PMU_GPS_CONF, "pd-gps");
 223
 224 static struct exynos_pm_domain *exynos4_pm_domains[] = {
 225         &exynos4_pd_mfc,
 226         &exynos4_pd_g3d,
 227         &exynos4_pd_lcd0,
 228         &exynos4_pd_lcd1,
 229         &exynos4_pd_tv,
 230         &exynos4_pd_cam,
 231         &exynos4_pd_gps,
 232 };
 233
 234 static __init int exynos4_pm_init_power_domain(void)
 235 {
 236         int idx;
 237
 238         if (of_have_populated_dt())
 239                 return exynos_pm_dt_parse_domains();
 240
 241         for (idx = 0; idx < ARRAY_SIZE(exynos4_pm_domains); idx++) {
 242                 struct exynos_pm_domain *pd = exynos4_pm_domains[idx];
 243                 int on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
 244
 245                 pm_genpd_init(&pd->pd, NULL, !on);
 246         }
 247
 248 #ifdef CONFIG_S5P_DEV_FIMD0
 249         exynos_pm_add_dev_to_genpd(&s5p_device_fimd0, &exynos4_pd_lcd0);
 250 #endif
 251 #ifdef CONFIG_S5P_DEV_TV
 252         exynos_pm_add_dev_to_genpd(&s5p_device_hdmi, &exynos4_pd_tv);
 253         exynos_pm_add_dev_to_genpd(&s5p_device_mixer, &exynos4_pd_tv);
 254 #endif
 255 #ifdef CONFIG_S5P_DEV_MFC
 256         exynos_pm_add_dev_to_genpd(&s5p_device_mfc, &exynos4_pd_mfc);
 257 #endif
 258 #ifdef CONFIG_S5P_DEV_FIMC0
 259         exynos_pm_add_dev_to_genpd(&s5p_device_fimc0, &exynos4_pd_cam);
 260 #endif
 261 #ifdef CONFIG_S5P_DEV_FIMC1
 262         exynos_pm_add_dev_to_genpd(&s5p_device_fimc1, &exynos4_pd_cam);
 263 #endif
 264 #ifdef CONFIG_S5P_DEV_FIMC2
 265         exynos_pm_add_dev_to_genpd(&s5p_device_fimc2, &exynos4_pd_cam);
 266 #endif
 267 #ifdef CONFIG_S5P_DEV_FIMC3
 268         exynos_pm_add_dev_to_genpd(&s5p_device_fimc3, &exynos4_pd_cam);
 269 #endif
 270 #ifdef CONFIG_S5P_DEV_CSIS0
 271         exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis0, &exynos4_pd_cam);
 272 #endif
 273 #ifdef CONFIG_S5P_DEV_CSIS1
 274         exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis1, &exynos4_pd_cam);
 275 #endif
 276 #ifdef CONFIG_S5P_DEV_G2D
 277         exynos_pm_add_dev_to_genpd(&s5p_device_g2d, &exynos4_pd_lcd0);
 278 #endif
 279 #ifdef CONFIG_S5P_DEV_JPEG
 280         exynos_pm_add_dev_to_genpd(&s5p_device_jpeg, &exynos4_pd_cam);
 281 #endif
 282         return 0;
 283 }
 284 arch_initcall(exynos4_pm_init_power_domain);
 285
 286 int __init exynos_pm_late_initcall(void)
 287 {
 288         pm_genpd_poweroff_unused();
 289         return 0;
 290 }