summaryrefslogtreecommitdiffstats
path: root/drivers/soc/samsung/exynos-pmu.c
blob: a18c93a4646c8db544c8e55d3de1f0cb2378ca06 (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
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
//		http://www.samsung.com/
//
// Exynos - CPU PMU(Power Management Unit) support

#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/syscon.h>
#include <linux/platform_device.h>
#include <linux/delay.h>

#include <linux/soc/samsung/exynos-regs-pmu.h>
#include <linux/soc/samsung/exynos-pmu.h>

#include "exynos-pmu.h"

struct exynos_pmu_context {
	struct device *dev;
	const struct exynos_pmu_data *pmu_data;
};

void __iomem *pmu_base_addr;
static struct exynos_pmu_context *pmu_context;

void pmu_raw_writel(u32 val, u32 offset)
{
	writel_relaxed(val, pmu_base_addr + offset);
}

u32 pmu_raw_readl(u32 offset)
{
	return readl_relaxed(pmu_base_addr + offset);
}

void exynos_sys_powerdown_conf(enum sys_powerdown mode)
{
	unsigned int i;
	const struct exynos_pmu_data *pmu_data;

	if (!pmu_context || !pmu_context->pmu_data)
		return;

	pmu_data = pmu_context->pmu_data;

	if (pmu_data->powerdown_conf)
		pmu_data->powerdown_conf(mode);

	if (pmu_data->pmu_config) {
		for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++)
			pmu_raw_writel(pmu_data->pmu_config[i].val[mode],
					pmu_data->pmu_config[i].offset);
	}

	if (pmu_data->powerdown_conf_extra)
		pmu_data->powerdown_conf_extra(mode);
}

/*
 * Split the data between ARM architectures because it is relatively big
 * and useless on other arch.
 */
#ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS
#define exynos_pmu_data_arm_ptr(data)	(&data)
#else
#define exynos_pmu_data_arm_ptr(data)	NULL
#endif

/*
 * PMU platform driver and devicetree bindings.
 */
static const struct of_device_id exynos_pmu_of_device_ids[] = {
	{
		.compatible = "samsung,exynos3250-pmu",
		.data = exynos_pmu_data_arm_ptr(exynos3250_pmu_data),
	}, {
		.compatible = "samsung,exynos4210-pmu",
		.data = exynos_pmu_data_arm_ptr(exynos4210_pmu_data),
	}, {
		.compatible = "samsung,exynos4412-pmu",
		.data = exynos_pmu_data_arm_ptr(exynos4412_pmu_data),
	}, {
		.compatible = "samsung,exynos5250-pmu",
		.data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data),
	}, {
		.compatible = "samsung,exynos5410-pmu",
	}, {
		.compatible = "samsung,exynos5420-pmu",
		.data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data),
	}, {
		.compatible = "samsung,exynos5433-pmu",
	}, {
		.compatible = "samsung,exynos7-pmu",
	},
	{ /*sentinel*/ },
};

static const struct mfd_cell exynos_pmu_devs[] = {
	{ .name = "exynos-clkout", },
};

struct regmap *exynos_get_pmu_regmap(void)
{
	struct device_node *np = of_find_matching_node(NULL,
						      exynos_pmu_of_device_ids);
	if (np)
		return syscon_node_to_regmap(np);
	return ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);

static int exynos_pmu_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	int ret;

	pmu_base_addr = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(pmu_base_addr))
		return PTR_ERR(pmu_base_addr);

	pmu_context = devm_kzalloc(&pdev->dev,
			sizeof(struct exynos_pmu_context),
			GFP_KERNEL);
	if (!pmu_context)
		return -ENOMEM;
	pmu_context->dev = dev;
	pmu_context->pmu_data = of_device_get_match_data(dev);

	if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init)
		pmu_context->pmu_data->pmu_init();

	platform_set_drvdata(pdev, pmu_context);

	ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, exynos_pmu_devs,
				   ARRAY_SIZE(exynos_pmu_devs), NULL, 0, NULL);
	if (ret)
		return ret;

	if (devm_of_platform_populate(dev))
		dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n");

	dev_dbg(dev, "Exynos PMU Driver probe done\n");
	return 0;
}

static struct platform_driver exynos_pmu_driver = {
	.driver  = {
		.name   = "exynos-pmu",
		.of_match_table = exynos_pmu_of_device_ids,
	},
	.probe = exynos_pmu_probe,
};

static int __init exynos_pmu_init(void)
{
	return platform_driver_register(&exynos_pmu_driver);

}
postcore_initcall(exynos_pmu_init);