linux/drivers/phy/phy-exynos-mipi-video.c
<<
>>
Prefs
   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);
 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        }
 169};
 170module_platform_driver(exynos_mipi_video_phy_driver);
 171
 172MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI CSI-2/DSI PHY driver");
 173MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 174MODULE_LICENSE("GPL v2");
 175
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.