Commit | Line | Data |
---|---|---|
91cfbd4e TA |
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> | |
8a65d236 TF |
22 | #include <linux/of_platform.h> |
23 | #include <linux/sched.h> | |
91cfbd4e TA |
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 | |
8a65d236 TF |
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 | ||
91cfbd4e TA |
160 | static __init int exynos_pm_dt_parse_domains(void) |
161 | { | |
8a65d236 | 162 | struct platform_device *pdev; |
91cfbd4e TA |
163 | struct device_node *np; |
164 | ||
165 | for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") { | |
166 | struct exynos_pm_domain *pd; | |
2ed5f236 | 167 | int on; |
91cfbd4e | 168 | |
8a65d236 TF |
169 | pdev = of_find_device_by_node(np); |
170 | ||
91cfbd4e TA |
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 | ||
7add0ec0 TF |
178 | pd->pd.name = kstrdup(np->name, GFP_KERNEL); |
179 | pd->name = pd->pd.name; | |
91cfbd4e TA |
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; | |
2ed5f236 | 184 | |
8a65d236 TF |
185 | platform_set_drvdata(pdev, pd); |
186 | ||
2ed5f236 TF |
187 | on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN; |
188 | ||
189 | pm_genpd_init(&pd->pd, NULL, !on); | |
91cfbd4e | 190 | } |
8a65d236 TF |
191 | |
192 | bus_register_notifier(&platform_bus_type, &platform_nb); | |
193 | ||
91cfbd4e TA |
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 | ||
8ab08c0c | 203 | static __init __maybe_unused void exynos_pm_add_dev_to_genpd(struct platform_device *pdev, |
91cfbd4e TA |
204 | struct exynos_pm_domain *pd) |
205 | { | |
206 | if (pdev->dev.bus) { | |
ebc35c72 MS |
207 | if (!pm_genpd_add_device(&pd->pd, &pdev->dev)) |
208 | pm_genpd_dev_need_restore(&pdev->dev, true); | |
209 | else | |
91cfbd4e TA |
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 | ||
76eb5567 MS |
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 | } | |
91cfbd4e TA |
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); | |
a9e87bd9 SK |
275 | #endif |
276 | #ifdef CONFIG_S5P_DEV_G2D | |
277 | exynos_pm_add_dev_to_genpd(&s5p_device_g2d, &exynos4_pd_lcd0); | |
75371477 SK |
278 | #endif |
279 | #ifdef CONFIG_S5P_DEV_JPEG | |
280 | exynos_pm_add_dev_to_genpd(&s5p_device_jpeg, &exynos4_pd_cam); | |
91cfbd4e TA |
281 | #endif |
282 | return 0; | |
283 | } | |
284 | arch_initcall(exynos4_pm_init_power_domain); | |
285 | ||
bb13fabc | 286 | int __init exynos_pm_late_initcall(void) |
91cfbd4e TA |
287 | { |
288 | pm_genpd_poweroff_unused(); | |
289 | return 0; | |
290 | } |