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/mfd/syscon/exynos5-pmu.h>
18#include <linux/of.h>
19#include <linux/of_address.h>
20#include <linux/phy/phy.h>
21#include <linux/platform_device.h>
22#include <linux/regmap.h>
23
24struct exynos_dp_video_phy_drvdata {
25	u32 phy_ctrl_offset;
26};
27
28struct exynos_dp_video_phy {
29	struct regmap *regs;
30	const struct exynos_dp_video_phy_drvdata *drvdata;
31};
32
33static 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				  EXYNOS5_PHY_ENABLE, EXYNOS5_PHY_ENABLE);
40}
41
42static 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				  EXYNOS5_PHY_ENABLE, 0);
49}
50
51static 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
57static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
58	.phy_ctrl_offset	= EXYNOS5_DPTX_PHY_CONTROL,
59};
60
61static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
62	.phy_ctrl_offset	= EXYNOS5420_DPTX_PHY_CONTROL,
63};
64
65static 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};
75MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
76
77static 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
111static 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};
118module_platform_driver(exynos_dp_video_phy_driver);
119
120MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
121MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
122MODULE_LICENSE("GPL v2");
123