tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY driver
3 *
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5 * Author: Sylwester Nawrocki <s.nawrocki@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/of.h>
17#include <linux/of_address.h>
18#include <linux/phy/phy.h>
19#include <linux/platform_device.h>
20#include <linux/spinlock.h>
21
22/* MIPI_PHYn_CONTROL register offset: n = 0..1 */
23#define EXYNOS_MIPI_PHY_CONTROL(n) ((n) * 4)
24#define EXYNOS_MIPI_PHY_ENABLE (1 << 0)
25#define EXYNOS_MIPI_PHY_SRESETN (1 << 1)
26#define EXYNOS_MIPI_PHY_MRESETN (1 << 2)
27#define EXYNOS_MIPI_PHY_RESET_MASK (3 << 1)
28
29enum exynos_mipi_phy_id {
30 EXYNOS_MIPI_PHY_ID_CSIS0,
31 EXYNOS_MIPI_PHY_ID_DSIM0,
32 EXYNOS_MIPI_PHY_ID_CSIS1,
33 EXYNOS_MIPI_PHY_ID_DSIM1,
34 EXYNOS_MIPI_PHYS_NUM
35};
36
37#define is_mipi_dsim_phy_id(id) \
38 ((id) == EXYNOS_MIPI_PHY_ID_DSIM0 || (id) == EXYNOS_MIPI_PHY_ID_DSIM1)
39
40struct exynos_mipi_video_phy {
41 spinlock_t slock;
42 struct video_phy_desc {
43 struct phy *phy;
44 unsigned int index;
45 } phys[EXYNOS_MIPI_PHYS_NUM];
46 void __iomem *regs;
47};
48
49static int __set_phy_state(struct exynos_mipi_video_phy *state,
50 enum exynos_mipi_phy_id id, unsigned int on)
51{
52 void __iomem *addr;
53 u32 reg, reset;
54
55 addr = state->regs + EXYNOS_MIPI_PHY_CONTROL(id / 2);
56
57 if (is_mipi_dsim_phy_id(id))
58 reset = EXYNOS_MIPI_PHY_MRESETN;
59 else
60 reset = EXYNOS_MIPI_PHY_SRESETN;
61
62 spin_lock(&state->slock);
63 reg = readl(addr);
64 if (on)
65 reg |= reset;
66 else
67 reg &= ~reset;
68 writel(reg, addr);
69
70 /* Clear ENABLE bit only if MRESETN, SRESETN bits are not set. */
71 if (on)
72 reg |= EXYNOS_MIPI_PHY_ENABLE;
73 else if (!(reg & EXYNOS_MIPI_PHY_RESET_MASK))
74 reg &= ~EXYNOS_MIPI_PHY_ENABLE;
75
76 writel(reg, addr);
77 spin_unlock(&state->slock);
78 return 0;
79}
80
81#define to_mipi_video_phy(desc) \
82 container_of((desc), struct exynos_mipi_video_phy, phys[(desc)->index]);
83
84static int exynos_mipi_video_phy_power_on(struct phy *phy)
85{
86 struct video_phy_desc *phy_desc = phy_get_drvdata(phy);
87 struct exynos_mipi_video_phy *state = to_mipi_video_phy(phy_desc);
88
89 return __set_phy_state(state, phy_desc->index, 1);
90}
91
92static int exynos_mipi_video_phy_power_off(struct phy *phy)
93{
94 struct video_phy_desc *phy_desc = phy_get_drvdata(phy);
95 struct exynos_mipi_video_phy *state = to_mipi_video_phy(phy_desc);
96
97 return __set_phy_state(state, phy_desc->index, 0);
98}
99
100static struct phy *exynos_mipi_video_phy_xlate(struct device *dev,
101 struct of_phandle_args *args)
102{
103 struct exynos_mipi_video_phy *state = dev_get_drvdata(dev);
104
105 if (WARN_ON(args->args[0] >= EXYNOS_MIPI_PHYS_NUM))
106 return ERR_PTR(-ENODEV);
107
108 return state->phys[args->args[0]].phy;
109}
110
111static struct phy_ops exynos_mipi_video_phy_ops = {
112 .power_on = exynos_mipi_video_phy_power_on,
113 .power_off = exynos_mipi_video_phy_power_off,
114 .owner = THIS_MODULE,
115};
116
117static int exynos_mipi_video_phy_probe(struct platform_device *pdev)
118{
119 struct exynos_mipi_video_phy *state;
120 struct device *dev = &pdev->dev;
121 struct resource *res;
122 struct phy_provider *phy_provider;
123 unsigned int i;
124
125 state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
126 if (!state)
127 return -ENOMEM;
128
129 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
130
131 state->regs = devm_ioremap_resource(dev, res);
132 if (IS_ERR(state->regs))
133 return PTR_ERR(state->regs);
134
135 dev_set_drvdata(dev, state);
136 spin_lock_init(&state->slock);
137
138 for (i = 0; i < EXYNOS_MIPI_PHYS_NUM; i++) {
139 struct phy *phy = devm_phy_create(dev, NULL,
140 &exynos_mipi_video_phy_ops, NULL);
141 if (IS_ERR(phy)) {
142 dev_err(dev, "failed to create PHY %d\n", i);
143 return PTR_ERR(phy);
144 }
145
146 state->phys[i].phy = phy;
147 state->phys[i].index = i;
148 phy_set_drvdata(phy, &state->phys[i]);
149 }
150
151 phy_provider = devm_of_phy_provider_register(dev,
152 exynos_mipi_video_phy_xlate);
153
154 return PTR_ERR_OR_ZERO(phy_provider);
155}
156
157static const struct of_device_id exynos_mipi_video_phy_of_match[] = {
158 { .compatible = "samsung,s5pv210-mipi-video-phy" },
159 { },
160};
161MODULE_DEVICE_TABLE(of, exynos_mipi_video_phy_of_match);
162
163static struct platform_driver exynos_mipi_video_phy_driver = {
164 .probe = exynos_mipi_video_phy_probe,
165 .driver = {
166 .of_match_table = exynos_mipi_video_phy_of_match,
167 .name = "exynos-mipi-video-phy",
168 .owner = THIS_MODULE,
169 }
170};
171module_platform_driver(exynos_mipi_video_phy_driver);
172
173MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI CSI-2/DSI PHY driver");
174MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
175MODULE_LICENSE("GPL v2");