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/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#include <linux/spinlock.h>
20
21/* MIPI_PHYn_CONTROL register offset: n = 0..1 */
22#define EXYNOS_MIPI_PHY_CONTROL(n) ((n) * 4)
23#define EXYNOS_MIPI_PHY_ENABLE (1 << 0)
24#define EXYNOS_MIPI_PHY_SRESETN (1 << 1)
25#define EXYNOS_MIPI_PHY_MRESETN (1 << 2)
26#define EXYNOS_MIPI_PHY_RESET_MASK (3 << 1)
27
28enum exynos_mipi_phy_id {
29 EXYNOS_MIPI_PHY_ID_CSIS0,
30 EXYNOS_MIPI_PHY_ID_DSIM0,
31 EXYNOS_MIPI_PHY_ID_CSIS1,
32 EXYNOS_MIPI_PHY_ID_DSIM1,
33 EXYNOS_MIPI_PHYS_NUM
34};
35
36#define is_mipi_dsim_phy_id(id) \
37 ((id) == EXYNOS_MIPI_PHY_ID_DSIM0 || (id) == EXYNOS_MIPI_PHY_ID_DSIM1)
38
39struct exynos_mipi_video_phy {
40 spinlock_t slock;
41 struct video_phy_desc {
42 struct phy *phy;
43 unsigned int index;
44 } phys[EXYNOS_MIPI_PHYS_NUM];
45 void __iomem *regs;
46};
47
48static int __set_phy_state(struct exynos_mipi_video_phy *state,
49 enum exynos_mipi_phy_id id, unsigned int on)
50{
51 void __iomem *addr;
52 u32 reg, reset;
53
54 addr = state->regs + EXYNOS_MIPI_PHY_CONTROL(id / 2);
55
56 if (is_mipi_dsim_phy_id(id))
57 reset = EXYNOS_MIPI_PHY_MRESETN;
58 else
59 reset = EXYNOS_MIPI_PHY_SRESETN;
60
61 spin_lock(&state->slock);
62 reg = readl(addr);
63 if (on)
64 reg |= reset;
65 else
66 reg &= ~reset;
67 writel(reg, addr);
68
69 /* Clear ENABLE bit only if MRESETN, SRESETN bits are not set. */
70 if (on)
71 reg |= EXYNOS_MIPI_PHY_ENABLE;
72 else if (!(reg & EXYNOS_MIPI_PHY_RESET_MASK))
73 reg &= ~EXYNOS_MIPI_PHY_ENABLE;
74
75 writel(reg, addr);
76 spin_unlock(&state->slock);
77 return 0;
78}
79
80#define to_mipi_video_phy(desc) \
81 container_of((desc), struct exynos_mipi_video_phy, phys[(desc)->index]);
82
83static int exynos_mipi_video_phy_power_on(struct phy *phy)
84{
85 struct video_phy_desc *phy_desc = phy_get_drvdata(phy);
86 struct exynos_mipi_video_phy *state = to_mipi_video_phy(phy_desc);
87
88 return __set_phy_state(state, phy_desc->index, 1);
89}
90
91static int exynos_mipi_video_phy_power_off(struct phy *phy)
92{
93 struct video_phy_desc *phy_desc = phy_get_drvdata(phy);
94 struct exynos_mipi_video_phy *state = to_mipi_video_phy(phy_desc);
95
96 return __set_phy_state(state, phy_desc->index, 0);
97}
98
99static struct phy *exynos_mipi_video_phy_xlate(struct device *dev,
100 struct of_phandle_args *args)
101{
102 struct exynos_mipi_video_phy *state = dev_get_drvdata(dev);
103
104 if (WARN_ON(args->args[0] > EXYNOS_MIPI_PHYS_NUM))
105 return ERR_PTR(-ENODEV);
106
107 return state->phys[args->args[0]].phy;
108}
109
110static struct phy_ops exynos_mipi_video_phy_ops = {
111 .power_on = exynos_mipi_video_phy_power_on,
112 .power_off = exynos_mipi_video_phy_power_off,
113 .owner = THIS_MODULE,
114};
115
116static int exynos_mipi_video_phy_probe(struct platform_device *pdev)
117{
118 struct exynos_mipi_video_phy *state;
119 struct device *dev = &pdev->dev;
120 struct resource *res;
121 struct phy_provider *phy_provider;
122 unsigned int i;
123
124 state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
125 if (!state)
126 return -ENOMEM;
127
128 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
129
130 state->regs = devm_ioremap_resource(dev, res);
131 if (IS_ERR(state->regs))
132 return PTR_ERR(state->regs);
133
134 dev_set_drvdata(dev, state);
135 spin_lock_init(&state->slock);
136
137 for (i = 0; i < EXYNOS_MIPI_PHYS_NUM; i++) {
138 struct phy *phy = devm_phy_create(dev,
139 &exynos_mipi_video_phy_ops, NULL);
140 if (IS_ERR(phy)) {
141 dev_err(dev, "failed to create PHY %d\n", i);
142 return PTR_ERR(phy);
143 }
144
145 state->phys[i].phy = phy;
146 state->phys[i].index = i;
147 phy_set_drvdata(phy, &state->phys[i]);
148 }
149
150 phy_provider = devm_of_phy_provider_register(dev,
151 exynos_mipi_video_phy_xlate);
152 if (IS_ERR(phy_provider))
153 return PTR_ERR(phy_provider);
154
155 return 0;
156}
157
158static const struct of_device_id exynos_mipi_video_phy_of_match[] = {
159 { .compatible = "samsung,s5pv210-mipi-video-phy" },
160 { },
161};
162MODULE_DEVICE_TABLE(of, exynos_mipi_video_phy_of_match);
163
164static struct platform_driver exynos_mipi_video_phy_driver = {
165 .probe = exynos_mipi_video_phy_probe,
166 .driver = {
167 .of_match_table = exynos_mipi_video_phy_of_match,
168 .name = "exynos-mipi-video-phy",
169 .owner = THIS_MODULE,
170 }
171};
172module_platform_driver(exynos_mipi_video_phy_driver);
173
174MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI CSI-2/DSI PHY driver");
175MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
176MODULE_LICENSE("GPL v2");