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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 | ||
12 | #include <linux/io.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/of_address.h> | |
17 | #include <linux/phy/phy.h> | |
18 | #include <linux/platform_device.h> | |
19 | ||
20 | /* DPTX_PHY_CONTROL register */ | |
21 | #define EXYNOS_DPTX_PHY_ENABLE (1 << 0) | |
22 | ||
23 | struct exynos_dp_video_phy { | |
24 | void __iomem *regs; | |
25 | }; | |
26 | ||
27 | static int __set_phy_state(struct exynos_dp_video_phy *state, unsigned int on) | |
28 | { | |
29 | u32 reg; | |
30 | ||
31 | reg = readl(state->regs); | |
32 | if (on) | |
33 | reg |= EXYNOS_DPTX_PHY_ENABLE; | |
34 | else | |
35 | reg &= ~EXYNOS_DPTX_PHY_ENABLE; | |
36 | writel(reg, state->regs); | |
37 | ||
38 | return 0; | |
39 | } | |
40 | ||
41 | static int exynos_dp_video_phy_power_on(struct phy *phy) | |
42 | { | |
43 | struct exynos_dp_video_phy *state = phy_get_drvdata(phy); | |
44 | ||
45 | return __set_phy_state(state, 1); | |
46 | } | |
47 | ||
48 | static int exynos_dp_video_phy_power_off(struct phy *phy) | |
49 | { | |
50 | struct exynos_dp_video_phy *state = phy_get_drvdata(phy); | |
51 | ||
52 | return __set_phy_state(state, 0); | |
53 | } | |
54 | ||
55 | static struct phy_ops exynos_dp_video_phy_ops = { | |
56 | .power_on = exynos_dp_video_phy_power_on, | |
57 | .power_off = exynos_dp_video_phy_power_off, | |
58 | .owner = THIS_MODULE, | |
59 | }; | |
60 | ||
61 | static int exynos_dp_video_phy_probe(struct platform_device *pdev) | |
62 | { | |
63 | struct exynos_dp_video_phy *state; | |
64 | struct device *dev = &pdev->dev; | |
65 | struct resource *res; | |
66 | struct phy_provider *phy_provider; | |
67 | struct phy *phy; | |
68 | ||
69 | state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL); | |
70 | if (!state) | |
71 | return -ENOMEM; | |
72 | ||
73 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
74 | ||
75 | state->regs = devm_ioremap_resource(dev, res); | |
76 | if (IS_ERR(state->regs)) | |
77 | return PTR_ERR(state->regs); | |
78 | ||
79 | phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); | |
80 | if (IS_ERR(phy_provider)) | |
81 | return PTR_ERR(phy_provider); | |
82 | ||
83 | phy = devm_phy_create(dev, &exynos_dp_video_phy_ops, NULL); | |
84 | if (IS_ERR(phy)) { | |
85 | dev_err(dev, "failed to create Display Port PHY\n"); | |
86 | return PTR_ERR(phy); | |
87 | } | |
88 | phy_set_drvdata(phy, state); | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static const struct of_device_id exynos_dp_video_phy_of_match[] = { | |
94 | { .compatible = "samsung,exynos5250-dp-video-phy" }, | |
95 | { }, | |
96 | }; | |
97 | MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match); | |
98 | ||
99 | static struct platform_driver exynos_dp_video_phy_driver = { | |
100 | .probe = exynos_dp_video_phy_probe, | |
101 | .driver = { | |
102 | .name = "exynos-dp-video-phy", | |
103 | .owner = THIS_MODULE, | |
104 | .of_match_table = exynos_dp_video_phy_of_match, | |
105 | } | |
106 | }; | |
107 | module_platform_driver(exynos_dp_video_phy_driver); | |
108 | ||
109 | MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); | |
110 | MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver"); | |
111 | MODULE_LICENSE("GPL v2"); |