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/of_device.h>
20 #include <linux/phy/phy.h>
21 #include <linux/platform_device.h>
22 #include <linux/regmap.h>
23 #include <linux/soc/samsung/exynos-regs-pmu.h>
24
25 struct exynos_dp_video_phy_drvdata {
26 u32 phy_ctrl_offset;
27 };
28
29 struct exynos_dp_video_phy {
30 struct regmap *regs;
31 const struct exynos_dp_video_phy_drvdata *drvdata;
32 };
33
exynos_dp_video_phy_power_on(struct phy * phy)34 static int exynos_dp_video_phy_power_on(struct phy *phy)
35 {
36 struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
37
38 /* Disable power isolation on DP-PHY */
39 return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
40 EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
41 }
42
exynos_dp_video_phy_power_off(struct phy * phy)43 static int exynos_dp_video_phy_power_off(struct phy *phy)
44 {
45 struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
46
47 /* Enable power isolation on DP-PHY */
48 return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
49 EXYNOS4_PHY_ENABLE, 0);
50 }
51
52 static const struct phy_ops exynos_dp_video_phy_ops = {
53 .power_on = exynos_dp_video_phy_power_on,
54 .power_off = exynos_dp_video_phy_power_off,
55 .owner = THIS_MODULE,
56 };
57
58 static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
59 .phy_ctrl_offset = EXYNOS5_DPTX_PHY_CONTROL,
60 };
61
62 static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
63 .phy_ctrl_offset = EXYNOS5420_DPTX_PHY_CONTROL,
64 };
65
66 static const struct of_device_id exynos_dp_video_phy_of_match[] = {
67 {
68 .compatible = "samsung,exynos5250-dp-video-phy",
69 .data = &exynos5250_dp_video_phy,
70 }, {
71 .compatible = "samsung,exynos5420-dp-video-phy",
72 .data = &exynos5420_dp_video_phy,
73 },
74 { },
75 };
76 MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
77
exynos_dp_video_phy_probe(struct platform_device * pdev)78 static int exynos_dp_video_phy_probe(struct platform_device *pdev)
79 {
80 struct exynos_dp_video_phy *state;
81 struct device *dev = &pdev->dev;
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 state->drvdata = of_device_get_match_data(dev);
97
98 phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
99 if (IS_ERR(phy)) {
100 dev_err(dev, "failed to create Display Port PHY\n");
101 return PTR_ERR(phy);
102 }
103 phy_set_drvdata(phy, state);
104
105 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
106
107 return PTR_ERR_OR_ZERO(phy_provider);
108 }
109
110 static struct platform_driver exynos_dp_video_phy_driver = {
111 .probe = exynos_dp_video_phy_probe,
112 .driver = {
113 .name = "exynos-dp-video-phy",
114 .of_match_table = exynos_dp_video_phy_of_match,
115 }
116 };
117 module_platform_driver(exynos_dp_video_phy_driver);
118
119 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
120 MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
121 MODULE_LICENSE("GPL v2");
122
