2 * Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY driver
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
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.
12 #include <linux/err.h>
14 #include <linux/kernel.h>
15 #include <linux/mfd/syscon/exynos4-pmu.h>
16 #include <linux/module.h>
18 #include <linux/of_address.h>
19 #include <linux/phy/phy.h>
20 #include <linux/platform_device.h>
21 #include <linux/regmap.h>
22 #include <linux/spinlock.h>
23 #include <linux/mfd/syscon.h>
25 /* MIPI_PHYn_CONTROL reg. offset (for base address from ioremap): n = 0..1 */
26 #define EXYNOS_MIPI_PHY_CONTROL(n) ((n) * 4)
28 enum 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,
36 #define is_mipi_dsim_phy_id(id) \
37 ((id) == EXYNOS_MIPI_PHY_ID_DSIM0 || (id) == EXYNOS_MIPI_PHY_ID_DSIM1)
39 struct exynos_mipi_video_phy {
40 struct video_phy_desc {
43 } phys[EXYNOS_MIPI_PHYS_NUM];
47 struct regmap *regmap;
50 static int __set_phy_state(struct exynos_mipi_video_phy *state,
51 enum exynos_mipi_phy_id id, unsigned int on)
53 const unsigned int offset = EXYNOS4_MIPI_PHY_CONTROL(id / 2);
57 if (is_mipi_dsim_phy_id(id))
58 reset = EXYNOS4_MIPI_PHY_MRESETN;
60 reset = EXYNOS4_MIPI_PHY_SRESETN;
63 mutex_lock(&state->mutex);
64 regmap_read(state->regmap, offset, &val);
69 regmap_write(state->regmap, offset, val);
71 val |= EXYNOS4_MIPI_PHY_ENABLE;
72 else if (!(val & EXYNOS4_MIPI_PHY_RESET_MASK))
73 val &= ~EXYNOS4_MIPI_PHY_ENABLE;
74 regmap_write(state->regmap, offset, val);
75 mutex_unlock(&state->mutex);
77 addr = state->regs + EXYNOS_MIPI_PHY_CONTROL(id / 2);
79 spin_lock(&state->slock);
86 /* Clear ENABLE bit only if MRESETN, SRESETN bits are not set */
88 val |= EXYNOS4_MIPI_PHY_ENABLE;
89 else if (!(val & EXYNOS4_MIPI_PHY_RESET_MASK))
90 val &= ~EXYNOS4_MIPI_PHY_ENABLE;
93 spin_unlock(&state->slock);
99 #define to_mipi_video_phy(desc) \
100 container_of((desc), struct exynos_mipi_video_phy, phys[(desc)->index]);
102 static int exynos_mipi_video_phy_power_on(struct phy *phy)
104 struct video_phy_desc *phy_desc = phy_get_drvdata(phy);
105 struct exynos_mipi_video_phy *state = to_mipi_video_phy(phy_desc);
107 return __set_phy_state(state, phy_desc->index, 1);
110 static int exynos_mipi_video_phy_power_off(struct phy *phy)
112 struct video_phy_desc *phy_desc = phy_get_drvdata(phy);
113 struct exynos_mipi_video_phy *state = to_mipi_video_phy(phy_desc);
115 return __set_phy_state(state, phy_desc->index, 0);
118 static struct phy *exynos_mipi_video_phy_xlate(struct device *dev,
119 struct of_phandle_args *args)
121 struct exynos_mipi_video_phy *state = dev_get_drvdata(dev);
123 if (WARN_ON(args->args[0] >= EXYNOS_MIPI_PHYS_NUM))
124 return ERR_PTR(-ENODEV);
126 return state->phys[args->args[0]].phy;
129 static struct phy_ops exynos_mipi_video_phy_ops = {
130 .power_on = exynos_mipi_video_phy_power_on,
131 .power_off = exynos_mipi_video_phy_power_off,
132 .owner = THIS_MODULE,
135 static int exynos_mipi_video_phy_probe(struct platform_device *pdev)
137 struct exynos_mipi_video_phy *state;
138 struct device *dev = &pdev->dev;
139 struct phy_provider *phy_provider;
142 state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
146 state->regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
147 if (IS_ERR(state->regmap)) {
148 struct resource *res;
150 dev_info(dev, "regmap lookup failed: %ld\n",
151 PTR_ERR(state->regmap));
153 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
154 state->regs = devm_ioremap_resource(dev, res);
155 if (IS_ERR(state->regs))
156 return PTR_ERR(state->regs);
159 dev_set_drvdata(dev, state);
160 spin_lock_init(&state->slock);
161 mutex_init(&state->mutex);
163 for (i = 0; i < EXYNOS_MIPI_PHYS_NUM; i++) {
164 struct phy *phy = devm_phy_create(dev, NULL,
165 &exynos_mipi_video_phy_ops);
167 dev_err(dev, "failed to create PHY %d\n", i);
171 state->phys[i].phy = phy;
172 state->phys[i].index = i;
173 phy_set_drvdata(phy, &state->phys[i]);
176 phy_provider = devm_of_phy_provider_register(dev,
177 exynos_mipi_video_phy_xlate);
179 return PTR_ERR_OR_ZERO(phy_provider);
182 static const struct of_device_id exynos_mipi_video_phy_of_match[] = {
183 { .compatible = "samsung,s5pv210-mipi-video-phy" },
186 MODULE_DEVICE_TABLE(of, exynos_mipi_video_phy_of_match);
188 static struct platform_driver exynos_mipi_video_phy_driver = {
189 .probe = exynos_mipi_video_phy_probe,
191 .of_match_table = exynos_mipi_video_phy_of_match,
192 .name = "exynos-mipi-video-phy",
195 module_platform_driver(exynos_mipi_video_phy_driver);
197 MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI CSI-2/DSI PHY driver");
198 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
199 MODULE_LICENSE("GPL v2");