2 * Exynos Generic power domain support.
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
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.
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.
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>
25 #include <mach/regs-pmu.h>
26 #include <plat/devs.h>
29 * Exynos specific wrapper around the generic power domain
31 struct exynos_pm_domain {
35 struct generic_pm_domain pd;
38 static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
40 struct exynos_pm_domain *pd;
45 pd = container_of(domain, struct exynos_pm_domain, pd);
48 pwr = power_on ? S5P_INT_LOCAL_PWR_EN : 0;
49 __raw_writel(pwr, base);
54 while ((__raw_readl(base + 0x4) & S5P_INT_LOCAL_PWR_EN) != pwr) {
56 op = (power_on) ? "enable" : "disable";
57 pr_err("Power domain %s %s failed\n", domain->name, op);
62 usleep_range(80, 100);
67 static int exynos_pd_power_on(struct generic_pm_domain *domain)
69 return exynos_pd_power(domain, true);
72 static int exynos_pd_power_off(struct generic_pm_domain *domain)
74 return exynos_pd_power(domain, false);
77 #define EXYNOS_GPD(PD, BASE, NAME) \
78 static struct exynos_pm_domain PD = { \
79 .base = (void __iomem *)BASE, \
82 .power_off = exynos_pd_power_off, \
83 .power_on = exynos_pd_power_on, \
88 static void exynos_add_device_to_domain(struct exynos_pm_domain *pd,
93 dev_dbg(dev, "adding to power domain %s\n", pd->pd.name);
96 ret = pm_genpd_add_device(&pd->pd, dev);
102 pm_genpd_dev_need_restore(dev, true);
105 static void exynos_remove_device_from_domain(struct device *dev)
107 struct generic_pm_domain *genpd = dev_to_genpd(dev);
110 dev_dbg(dev, "removing from power domain %s\n", genpd->name);
113 ret = pm_genpd_remove_device(genpd, dev);
120 static void exynos_read_domain_from_dt(struct device *dev)
122 struct platform_device *pd_pdev;
123 struct exynos_pm_domain *pd;
124 struct device_node *node;
126 node = of_parse_phandle(dev->of_node, "samsung,power-domain", 0);
129 pd_pdev = of_find_device_by_node(node);
132 pd = platform_get_drvdata(pd_pdev);
133 exynos_add_device_to_domain(pd, dev);
136 static int exynos_pm_notifier_call(struct notifier_block *nb,
137 unsigned long event, void *data)
139 struct device *dev = data;
142 case BUS_NOTIFY_BIND_DRIVER:
144 exynos_read_domain_from_dt(dev);
148 case BUS_NOTIFY_UNBOUND_DRIVER:
149 exynos_remove_device_from_domain(dev);
156 static struct notifier_block platform_nb = {
157 .notifier_call = exynos_pm_notifier_call,
160 static __init int exynos_pm_dt_parse_domains(void)
162 struct platform_device *pdev;
163 struct device_node *np;
165 for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
166 struct exynos_pm_domain *pd;
169 pdev = of_find_device_by_node(np);
171 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
173 pr_err("%s: failed to allocate memory for domain\n",
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;
185 platform_set_drvdata(pdev, pd);
187 on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
189 pm_genpd_init(&pd->pd, NULL, !on);
192 bus_register_notifier(&platform_bus_type, &platform_nb);
197 static __init int exynos_pm_dt_parse_domains(void)
201 #endif /* CONFIG_OF */
203 static __init __maybe_unused void exynos_pm_add_dev_to_genpd(struct platform_device *pdev,
204 struct exynos_pm_domain *pd)
207 if (!pm_genpd_add_device(&pd->pd, &pdev->dev))
208 pm_genpd_dev_need_restore(&pdev->dev, true);
210 pr_info("%s: error in adding %s device to %s power"
211 "domain\n", __func__, dev_name(&pdev->dev),
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");
224 static struct exynos_pm_domain *exynos4_pm_domains[] = {
234 static __init int exynos4_pm_init_power_domain(void)
238 if (of_have_populated_dt())
239 return exynos_pm_dt_parse_domains();
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;
245 pm_genpd_init(&pd->pd, NULL, !on);
248 #ifdef CONFIG_S5P_DEV_FIMD0
249 exynos_pm_add_dev_to_genpd(&s5p_device_fimd0, &exynos4_pd_lcd0);
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);
255 #ifdef CONFIG_S5P_DEV_MFC
256 exynos_pm_add_dev_to_genpd(&s5p_device_mfc, &exynos4_pd_mfc);
258 #ifdef CONFIG_S5P_DEV_FIMC0
259 exynos_pm_add_dev_to_genpd(&s5p_device_fimc0, &exynos4_pd_cam);
261 #ifdef CONFIG_S5P_DEV_FIMC1
262 exynos_pm_add_dev_to_genpd(&s5p_device_fimc1, &exynos4_pd_cam);
264 #ifdef CONFIG_S5P_DEV_FIMC2
265 exynos_pm_add_dev_to_genpd(&s5p_device_fimc2, &exynos4_pd_cam);
267 #ifdef CONFIG_S5P_DEV_FIMC3
268 exynos_pm_add_dev_to_genpd(&s5p_device_fimc3, &exynos4_pd_cam);
270 #ifdef CONFIG_S5P_DEV_CSIS0
271 exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis0, &exynos4_pd_cam);
273 #ifdef CONFIG_S5P_DEV_CSIS1
274 exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis1, &exynos4_pd_cam);
276 #ifdef CONFIG_S5P_DEV_G2D
277 exynos_pm_add_dev_to_genpd(&s5p_device_g2d, &exynos4_pd_lcd0);
279 #ifdef CONFIG_S5P_DEV_JPEG
280 exynos_pm_add_dev_to_genpd(&s5p_device_jpeg, &exynos4_pd_cam);
284 arch_initcall(exynos4_pm_init_power_domain);
286 int __init exynos_pm_late_initcall(void)
288 pm_genpd_poweroff_unused();