1 /*
2  * Samsung EXYNOS SoC series Display Port PHY driver
3  *
4  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5  * Author: Jingoo Han <jg1.han@samsung.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 
12 #include <linux/err.h>
13 #include <linux/io.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/mfd/syscon.h>
17 #include <linux/of.h>
18 #include <linux/of_address.h>
19 #include <linux/phy/phy.h>
20 #include <linux/platform_device.h>
21 #include <linux/regmap.h>
22 #include <linux/soc/samsung/exynos-regs-pmu.h>
23 
24 struct exynos_dp_video_phy_drvdata {
25 	u32 phy_ctrl_offset;
26 };
27 
28 struct exynos_dp_video_phy {
29 	struct regmap *regs;
30 	const struct exynos_dp_video_phy_drvdata *drvdata;
31 };
32 
33 static int exynos_dp_video_phy_power_on(struct phy *phy)
34 {
35 	struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
36 
37 	/* Disable power isolation on DP-PHY */
38 	return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
39 				  EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
40 }
41 
42 static int exynos_dp_video_phy_power_off(struct phy *phy)
43 {
44 	struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
45 
46 	/* Enable power isolation on DP-PHY */
47 	return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
48 				  EXYNOS4_PHY_ENABLE, 0);
49 }
50 
51 static const struct phy_ops exynos_dp_video_phy_ops = {
52 	.power_on	= exynos_dp_video_phy_power_on,
53 	.power_off	= exynos_dp_video_phy_power_off,
54 	.owner		= THIS_MODULE,
55 };
56 
57 static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
58 	.phy_ctrl_offset	= EXYNOS5_DPTX_PHY_CONTROL,
59 };
60 
61 static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
62 	.phy_ctrl_offset	= EXYNOS5420_DPTX_PHY_CONTROL,
63 };
64 
65 static const struct of_device_id exynos_dp_video_phy_of_match[] = {
66 	{
67 		.compatible = "samsung,exynos5250-dp-video-phy",
68 		.data = &exynos5250_dp_video_phy,
69 	}, {
70 		.compatible = "samsung,exynos5420-dp-video-phy",
71 		.data = &exynos5420_dp_video_phy,
72 	},
73 	{ },
74 };
75 MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
76 
77 static int exynos_dp_video_phy_probe(struct platform_device *pdev)
78 {
79 	struct exynos_dp_video_phy *state;
80 	struct device *dev = &pdev->dev;
81 	const struct of_device_id *match;
82 	struct phy_provider *phy_provider;
83 	struct phy *phy;
84 
85 	state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
86 	if (!state)
87 		return -ENOMEM;
88 
89 	state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
90 						      "samsung,pmu-syscon");
91 	if (IS_ERR(state->regs)) {
92 		dev_err(dev, "Failed to lookup PMU regmap\n");
93 		return PTR_ERR(state->regs);
94 	}
95 
96 	match = of_match_node(exynos_dp_video_phy_of_match, dev->of_node);
97 	state->drvdata = match->data;
98 
99 	phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
100 	if (IS_ERR(phy)) {
101 		dev_err(dev, "failed to create Display Port PHY\n");
102 		return PTR_ERR(phy);
103 	}
104 	phy_set_drvdata(phy, state);
105 
106 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
107 
108 	return PTR_ERR_OR_ZERO(phy_provider);
109 }
110 
111 static struct platform_driver exynos_dp_video_phy_driver = {
112 	.probe	= exynos_dp_video_phy_probe,
113 	.driver = {
114 		.name	= "exynos-dp-video-phy",
115 		.of_match_table	= exynos_dp_video_phy_of_match,
116 	}
117 };
118 module_platform_driver(exynos_dp_video_phy_driver);
119 
120 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
121 MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
122 MODULE_LICENSE("GPL v2");
123