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74988e8b JH |
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 | ||
bbe21b2a | 12 | #include <linux/err.h> |
74988e8b JH |
13 | #include <linux/io.h> |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
a5ec5986 VG |
16 | #include <linux/mfd/syscon.h> |
17 | #include <linux/mfd/syscon/exynos5-pmu.h> | |
74988e8b JH |
18 | #include <linux/of.h> |
19 | #include <linux/of_address.h> | |
20 | #include <linux/phy/phy.h> | |
21 | #include <linux/platform_device.h> | |
a5ec5986 | 22 | #include <linux/regmap.h> |
74988e8b | 23 | |
a5ec5986 VG |
24 | struct exynos_dp_video_phy_drvdata { |
25 | u32 phy_ctrl_offset; | |
26 | }; | |
74988e8b JH |
27 | |
28 | struct exynos_dp_video_phy { | |
a5ec5986 VG |
29 | struct regmap *regs; |
30 | const struct exynos_dp_video_phy_drvdata *drvdata; | |
74988e8b JH |
31 | }; |
32 | ||
a5ec5986 VG |
33 | static void exynos_dp_video_phy_pwr_isol(struct exynos_dp_video_phy *state, |
34 | unsigned int on) | |
74988e8b | 35 | { |
a5ec5986 VG |
36 | unsigned int val; |
37 | ||
38 | if (IS_ERR(state->regs)) | |
39 | return; | |
74988e8b | 40 | |
a5ec5986 | 41 | val = on ? 0 : EXYNOS5_PHY_ENABLE; |
74988e8b | 42 | |
a5ec5986 VG |
43 | regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset, |
44 | EXYNOS5_PHY_ENABLE, val); | |
74988e8b JH |
45 | } |
46 | ||
47 | static int exynos_dp_video_phy_power_on(struct phy *phy) | |
48 | { | |
49 | struct exynos_dp_video_phy *state = phy_get_drvdata(phy); | |
50 | ||
a5ec5986 VG |
51 | /* Disable power isolation on DP-PHY */ |
52 | exynos_dp_video_phy_pwr_isol(state, 0); | |
53 | ||
54 | return 0; | |
74988e8b JH |
55 | } |
56 | ||
57 | static int exynos_dp_video_phy_power_off(struct phy *phy) | |
58 | { | |
59 | struct exynos_dp_video_phy *state = phy_get_drvdata(phy); | |
60 | ||
a5ec5986 VG |
61 | /* Enable power isolation on DP-PHY */ |
62 | exynos_dp_video_phy_pwr_isol(state, 1); | |
63 | ||
64 | return 0; | |
74988e8b JH |
65 | } |
66 | ||
67 | static struct phy_ops exynos_dp_video_phy_ops = { | |
68 | .power_on = exynos_dp_video_phy_power_on, | |
69 | .power_off = exynos_dp_video_phy_power_off, | |
70 | .owner = THIS_MODULE, | |
71 | }; | |
72 | ||
a5ec5986 VG |
73 | static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = { |
74 | .phy_ctrl_offset = EXYNOS5_DPTX_PHY_CONTROL, | |
75 | }; | |
76 | ||
77 | static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = { | |
78 | .phy_ctrl_offset = EXYNOS5420_DPTX_PHY_CONTROL, | |
79 | }; | |
80 | ||
81 | static const struct of_device_id exynos_dp_video_phy_of_match[] = { | |
82 | { | |
83 | .compatible = "samsung,exynos5250-dp-video-phy", | |
84 | .data = &exynos5250_dp_video_phy, | |
85 | }, { | |
86 | .compatible = "samsung,exynos5420-dp-video-phy", | |
87 | .data = &exynos5420_dp_video_phy, | |
88 | }, | |
89 | { }, | |
90 | }; | |
91 | MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match); | |
92 | ||
74988e8b JH |
93 | static int exynos_dp_video_phy_probe(struct platform_device *pdev) |
94 | { | |
95 | struct exynos_dp_video_phy *state; | |
96 | struct device *dev = &pdev->dev; | |
a5ec5986 | 97 | const struct of_device_id *match; |
74988e8b JH |
98 | struct phy_provider *phy_provider; |
99 | struct phy *phy; | |
100 | ||
101 | state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL); | |
102 | if (!state) | |
103 | return -ENOMEM; | |
104 | ||
a5ec5986 VG |
105 | state->regs = syscon_regmap_lookup_by_phandle(dev->of_node, |
106 | "samsung,pmu-syscon"); | |
107 | if (IS_ERR(state->regs)) { | |
108 | dev_err(dev, "Failed to lookup PMU regmap\n"); | |
74988e8b | 109 | return PTR_ERR(state->regs); |
a5ec5986 VG |
110 | } |
111 | ||
112 | match = of_match_node(exynos_dp_video_phy_of_match, dev->of_node); | |
113 | state->drvdata = match->data; | |
74988e8b | 114 | |
dbc98635 | 115 | phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops); |
74988e8b JH |
116 | if (IS_ERR(phy)) { |
117 | dev_err(dev, "failed to create Display Port PHY\n"); | |
118 | return PTR_ERR(phy); | |
119 | } | |
120 | phy_set_drvdata(phy, state); | |
121 | ||
64fe1891 | 122 | phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); |
64fe1891 | 123 | |
bbe21b2a | 124 | return PTR_ERR_OR_ZERO(phy_provider); |
74988e8b JH |
125 | } |
126 | ||
74988e8b JH |
127 | static struct platform_driver exynos_dp_video_phy_driver = { |
128 | .probe = exynos_dp_video_phy_probe, | |
129 | .driver = { | |
130 | .name = "exynos-dp-video-phy", | |
74988e8b JH |
131 | .of_match_table = exynos_dp_video_phy_of_match, |
132 | } | |
133 | }; | |
134 | module_platform_driver(exynos_dp_video_phy_driver); | |
135 | ||
136 | MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); | |
137 | MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver"); | |
138 | MODULE_LICENSE("GPL v2"); |