1// SPDX-License-Identifier: GPL-2.0
2//
3// Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
4//		http://www.samsung.com/
5//
6// Exynos - CPU PMU(Power Management Unit) support
7
8#include <linux/of.h>
9#include <linux/of_address.h>
10#include <linux/of_device.h>
11#include <linux/mfd/syscon.h>
12#include <linux/platform_device.h>
13#include <linux/delay.h>
14
15#include <linux/soc/samsung/exynos-regs-pmu.h>
16#include <linux/soc/samsung/exynos-pmu.h>
17
18#include "exynos-pmu.h"
19
20struct exynos_pmu_context {
21	struct device *dev;
22	const struct exynos_pmu_data *pmu_data;
23};
24
25void __iomem *pmu_base_addr;
26static struct exynos_pmu_context *pmu_context;
27
28void pmu_raw_writel(u32 val, u32 offset)
29{
30	writel_relaxed(val, pmu_base_addr + offset);
31}
32
33u32 pmu_raw_readl(u32 offset)
34{
35	return readl_relaxed(pmu_base_addr + offset);
36}
37
38void exynos_sys_powerdown_conf(enum sys_powerdown mode)
39{
40	unsigned int i;
41	const struct exynos_pmu_data *pmu_data;
42
43	if (!pmu_context || !pmu_context->pmu_data)
44		return;
45
46	pmu_data = pmu_context->pmu_data;
47
48	if (pmu_data->powerdown_conf)
49		pmu_data->powerdown_conf(mode);
50
51	if (pmu_data->pmu_config) {
52		for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++)
53			pmu_raw_writel(pmu_data->pmu_config[i].val[mode],
54					pmu_data->pmu_config[i].offset);
55	}
56
57	if (pmu_data->powerdown_conf_extra)
58		pmu_data->powerdown_conf_extra(mode);
59}
60
61/*
62 * Split the data between ARM architectures because it is relatively big
63 * and useless on other arch.
64 */
65#ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS
66#define exynos_pmu_data_arm_ptr(data)	(&data)
67#else
68#define exynos_pmu_data_arm_ptr(data)	NULL
69#endif
70
71/*
72 * PMU platform driver and devicetree bindings.
73 */
74static const struct of_device_id exynos_pmu_of_device_ids[] = {
75	{
76		.compatible = "samsung,exynos3250-pmu",
77		.data = exynos_pmu_data_arm_ptr(exynos3250_pmu_data),
78	}, {
79		.compatible = "samsung,exynos4210-pmu",
80		.data = exynos_pmu_data_arm_ptr(exynos4210_pmu_data),
81	}, {
82		.compatible = "samsung,exynos4412-pmu",
83		.data = exynos_pmu_data_arm_ptr(exynos4412_pmu_data),
84	}, {
85		.compatible = "samsung,exynos5250-pmu",
86		.data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data),
87	}, {
88		.compatible = "samsung,exynos5410-pmu",
89	}, {
90		.compatible = "samsung,exynos5420-pmu",
91		.data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data),
92	}, {
93		.compatible = "samsung,exynos5433-pmu",
94	}, {
95		.compatible = "samsung,exynos7-pmu",
96	},
97	{ /*sentinel*/ },
98};
99
100struct regmap *exynos_get_pmu_regmap(void)
101{
102	struct device_node *np = of_find_matching_node(NULL,
103						      exynos_pmu_of_device_ids);
104	if (np)
105		return syscon_node_to_regmap(np);
106	return ERR_PTR(-ENODEV);
107}
108EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
109
110static int exynos_pmu_probe(struct platform_device *pdev)
111{
112	struct device *dev = &pdev->dev;
113
114	pmu_base_addr = devm_platform_ioremap_resource(pdev, 0);
115	if (IS_ERR(pmu_base_addr))
116		return PTR_ERR(pmu_base_addr);
117
118	pmu_context = devm_kzalloc(&pdev->dev,
119			sizeof(struct exynos_pmu_context),
120			GFP_KERNEL);
121	if (!pmu_context)
122		return -ENOMEM;
123	pmu_context->dev = dev;
124	pmu_context->pmu_data = of_device_get_match_data(dev);
125
126	if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init)
127		pmu_context->pmu_data->pmu_init();
128
129	platform_set_drvdata(pdev, pmu_context);
130
131	if (devm_of_platform_populate(dev))
132		dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n");
133
134	dev_dbg(dev, "Exynos PMU Driver probe done\n");
135	return 0;
136}
137
138static struct platform_driver exynos_pmu_driver = {
139	.driver  = {
140		.name   = "exynos-pmu",
141		.of_match_table = exynos_pmu_of_device_ids,
142	},
143	.probe = exynos_pmu_probe,
144};
145
146static int __init exynos_pmu_init(void)
147{
148	return platform_driver_register(&exynos_pmu_driver);
149
150}
151postcore_initcall(exynos_pmu_init);
152