summaryrefslogtreecommitdiff
path: root/arch/arm/mach-exynos/pm_domains.c
blob: 5b7ce7ea6c6182e9fdb3e91c9133771a814f0f9c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
/*
 * Exynos Generic power domain support.
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * Implementation of Exynos specific power domain control which is used in
 * conjunction with runtime-pm. Support for both device-tree and non-device-tree
 * based power domain support is included.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/pm_domain.h>
#include <linux/delay.h>
#include <linux/of_address.h>

#include <mach/regs-pmu.h>
#include <plat/devs.h>

/*
 * Exynos specific wrapper around the generic power domain
 */
struct exynos_pm_domain {
	void __iomem *base;
	char const *name;
	bool is_off;
	struct generic_pm_domain pd;
};

static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
{
	struct exynos_pm_domain *pd;
	void __iomem *base;
	u32 timeout, pwr;
	char *op;

	pd = container_of(domain, struct exynos_pm_domain, pd);
	base = pd->base;

	pwr = power_on ? S5P_INT_LOCAL_PWR_EN : 0;
	__raw_writel(pwr, base);

	/* Wait max 1ms */
	timeout = 10;

	while ((__raw_readl(base + 0x4) & S5P_INT_LOCAL_PWR_EN)	!= pwr) {
		if (!timeout) {
			op = (power_on) ? "enable" : "disable";
			pr_err("Power domain %s %s failed\n", domain->name, op);
			return -ETIMEDOUT;
		}
		timeout--;
		cpu_relax();
		usleep_range(80, 100);
	}
	return 0;
}

static int exynos_pd_power_on(struct generic_pm_domain *domain)
{
	return exynos_pd_power(domain, true);
}

static int exynos_pd_power_off(struct generic_pm_domain *domain)
{
	return exynos_pd_power(domain, false);
}

#define EXYNOS_GPD(PD, BASE, NAME)			\
static struct exynos_pm_domain PD = {			\
	.base = (void __iomem *)BASE,			\
	.name = NAME,					\
	.pd = {						\
		.power_off = exynos_pd_power_off,	\
		.power_on = exynos_pd_power_on,	\
	},						\
}

#ifdef CONFIG_OF
static __init int exynos_pm_dt_parse_domains(void)
{
	struct device_node *np;

	for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
		struct exynos_pm_domain *pd;
		int on;

		pd = kzalloc(sizeof(*pd), GFP_KERNEL);
		if (!pd) {
			pr_err("%s: failed to allocate memory for domain\n",
					__func__);
			return -ENOMEM;
		}

		pd->pd.name = kstrdup(np->name, GFP_KERNEL);
		pd->name = pd->pd.name;
		pd->base = of_iomap(np, 0);
		pd->pd.power_off = exynos_pd_power_off;
		pd->pd.power_on = exynos_pd_power_on;
		pd->pd.of_node = np;

		on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;

		pm_genpd_init(&pd->pd, NULL, !on);
	}
	return 0;
}
#else
static __init int exynos_pm_dt_parse_domains(void)
{
	return 0;
}
#endif /* CONFIG_OF */

static __init __maybe_unused void exynos_pm_add_dev_to_genpd(struct platform_device *pdev,
						struct exynos_pm_domain *pd)
{
	if (pdev->dev.bus) {
		if (!pm_genpd_add_device(&pd->pd, &pdev->dev))
			pm_genpd_dev_need_restore(&pdev->dev, true);
		else
			pr_info("%s: error in adding %s device to %s power"
				"domain\n", __func__, dev_name(&pdev->dev),
				pd->name);
	}
}

EXYNOS_GPD(exynos4_pd_mfc, S5P_PMU_MFC_CONF, "pd-mfc");
EXYNOS_GPD(exynos4_pd_g3d, S5P_PMU_G3D_CONF, "pd-g3d");
EXYNOS_GPD(exynos4_pd_lcd0, S5P_PMU_LCD0_CONF, "pd-lcd0");
EXYNOS_GPD(exynos4_pd_lcd1, S5P_PMU_LCD1_CONF, "pd-lcd1");
EXYNOS_GPD(exynos4_pd_tv, S5P_PMU_TV_CONF, "pd-tv");
EXYNOS_GPD(exynos4_pd_cam, S5P_PMU_CAM_CONF, "pd-cam");
EXYNOS_GPD(exynos4_pd_gps, S5P_PMU_GPS_CONF, "pd-gps");

static struct exynos_pm_domain *exynos4_pm_domains[] = {
	&exynos4_pd_mfc,
	&exynos4_pd_g3d,
	&exynos4_pd_lcd0,
	&exynos4_pd_lcd1,
	&exynos4_pd_tv,
	&exynos4_pd_cam,
	&exynos4_pd_gps,
};

static __init int exynos4_pm_init_power_domain(void)
{
	int idx;

	if (of_have_populated_dt())
		return exynos_pm_dt_parse_domains();

	for (idx = 0; idx < ARRAY_SIZE(exynos4_pm_domains); idx++) {
		struct exynos_pm_domain *pd = exynos4_pm_domains[idx];
		int on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;

		pm_genpd_init(&pd->pd, NULL, !on);
	}

#ifdef CONFIG_S5P_DEV_FIMD0
	exynos_pm_add_dev_to_genpd(&s5p_device_fimd0, &exynos4_pd_lcd0);
#endif
#ifdef CONFIG_S5P_DEV_TV
	exynos_pm_add_dev_to_genpd(&s5p_device_hdmi, &exynos4_pd_tv);
	exynos_pm_add_dev_to_genpd(&s5p_device_mixer, &exynos4_pd_tv);
#endif
#ifdef CONFIG_S5P_DEV_MFC
	exynos_pm_add_dev_to_genpd(&s5p_device_mfc, &exynos4_pd_mfc);
#endif
#ifdef CONFIG_S5P_DEV_FIMC0
	exynos_pm_add_dev_to_genpd(&s5p_device_fimc0, &exynos4_pd_cam);
#endif
#ifdef CONFIG_S5P_DEV_FIMC1
	exynos_pm_add_dev_to_genpd(&s5p_device_fimc1, &exynos4_pd_cam);
#endif
#ifdef CONFIG_S5P_DEV_FIMC2
	exynos_pm_add_dev_to_genpd(&s5p_device_fimc2, &exynos4_pd_cam);
#endif
#ifdef CONFIG_S5P_DEV_FIMC3
	exynos_pm_add_dev_to_genpd(&s5p_device_fimc3, &exynos4_pd_cam);
#endif
#ifdef CONFIG_S5P_DEV_CSIS0
	exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis0, &exynos4_pd_cam);
#endif
#ifdef CONFIG_S5P_DEV_CSIS1
	exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis1, &exynos4_pd_cam);
#endif
#ifdef CONFIG_S5P_DEV_G2D
	exynos_pm_add_dev_to_genpd(&s5p_device_g2d, &exynos4_pd_lcd0);
#endif
#ifdef CONFIG_S5P_DEV_JPEG
	exynos_pm_add_dev_to_genpd(&s5p_device_jpeg, &exynos4_pd_cam);
#endif
	return 0;
}
arch_initcall(exynos4_pm_init_power_domain);

int __init exynos_pm_late_initcall(void)
{
	pm_genpd_poweroff_unused();
	return 0;
}