linux/drivers/phy/phy-exynos-dp-video.c
<<
>>
Prefs
   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/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
  20/* DPTX_PHY_CONTROL register */
  21#define EXYNOS_DPTX_PHY_ENABLE          (1 << 0)
  22
  23struct exynos_dp_video_phy {
  24        void __iomem *regs;
  25};
  26
  27static int __set_phy_state(struct exynos_dp_video_phy *state, unsigned int on)
  28{
  29        u32 reg;
  30
  31        reg = readl(state->regs);
  32        if (on)
  33                reg |= EXYNOS_DPTX_PHY_ENABLE;
  34        else
  35                reg &= ~EXYNOS_DPTX_PHY_ENABLE;
  36        writel(reg, state->regs);
  37
  38        return 0;
  39}
  40
  41static int exynos_dp_video_phy_power_on(struct phy *phy)
  42{
  43        struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
  44
  45        return __set_phy_state(state, 1);
  46}
  47
  48static int exynos_dp_video_phy_power_off(struct phy *phy)
  49{
  50        struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
  51
  52        return __set_phy_state(state, 0);
  53}
  54
  55static struct phy_ops exynos_dp_video_phy_ops = {
  56        .power_on       = exynos_dp_video_phy_power_on,
  57        .power_off      = exynos_dp_video_phy_power_off,
  58        .owner          = THIS_MODULE,
  59};
  60
  61static int exynos_dp_video_phy_probe(struct platform_device *pdev)
  62{
  63        struct exynos_dp_video_phy *state;
  64        struct device *dev = &pdev->dev;
  65        struct resource *res;
  66        struct phy_provider *phy_provider;
  67        struct phy *phy;
  68
  69        state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
  70        if (!state)
  71                return -ENOMEM;
  72
  73        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  74
  75        state->regs = devm_ioremap_resource(dev, res);
  76        if (IS_ERR(state->regs))
  77                return PTR_ERR(state->regs);
  78
  79        phy = devm_phy_create(dev, &exynos_dp_video_phy_ops, NULL);
  80        if (IS_ERR(phy)) {
  81                dev_err(dev, "failed to create Display Port PHY\n");
  82                return PTR_ERR(phy);
  83        }
  84        phy_set_drvdata(phy, state);
  85
  86        phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
  87        if (IS_ERR(phy_provider))
  88                return PTR_ERR(phy_provider);
  89
  90        return 0;
  91}
  92
  93static const struct of_device_id exynos_dp_video_phy_of_match[] = {
  94        { .compatible = "samsung,exynos5250-dp-video-phy" },
  95        { },
  96};
  97MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
  98
  99static struct platform_driver exynos_dp_video_phy_driver = {
 100        .probe  = exynos_dp_video_phy_probe,
 101        .driver = {
 102                .name   = "exynos-dp-video-phy",
 103                .owner  = THIS_MODULE,
 104                .of_match_table = exynos_dp_video_phy_of_match,
 105        }
 106};
 107module_platform_driver(exynos_dp_video_phy_driver);
 108
 109MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 110MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
 111MODULE_LICENSE("GPL v2");
 112
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.