111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
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* Samsung EXYNOS SoC series Display Port PHY driver
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*
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* Copyright (C) 2013 Samsung Electronics Co., Ltd.
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* Author: Jingoo Han <jg1.han@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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/* DPTX_PHY_CONTROL register */
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#define EXYNOS_DPTX_PHY_ENABLE (1 << 0)
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struct exynos_dp_video_phy {
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void __iomem *regs;
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};
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static int __set_phy_state(struct exynos_dp_video_phy *state, unsigned int on)
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{
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u32 reg;
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reg = readl(state->regs);
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if (on)
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reg |= EXYNOS_DPTX_PHY_ENABLE;
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else
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reg &= ~EXYNOS_DPTX_PHY_ENABLE;
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writel(reg, state->regs);
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return 0;
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}
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static int exynos_dp_video_phy_power_on(struct phy *phy)
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{
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struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
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return __set_phy_state(state, 1);
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}
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static int exynos_dp_video_phy_power_off(struct phy *phy)
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{
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struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
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return __set_phy_state(state, 0);
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}
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static struct phy_ops exynos_dp_video_phy_ops = {
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.power_on = exynos_dp_video_phy_power_on,
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.power_off = exynos_dp_video_phy_power_off,
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.owner = THIS_MODULE,
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};
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static int exynos_dp_video_phy_probe(struct platform_device *pdev)
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{
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struct exynos_dp_video_phy *state;
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct phy_provider *phy_provider;
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struct phy *phy;
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state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
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if (!state)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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state->regs = devm_ioremap_resource(dev, res);
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if (IS_ERR(state->regs))
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return PTR_ERR(state->regs);
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phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops, NULL);
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if (IS_ERR(phy)) {
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dev_err(dev, "failed to create Display Port PHY\n");
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return PTR_ERR(phy);
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}
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phy_set_drvdata(phy, state);
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phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
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return PTR_ERR_OR_ZERO(phy_provider);
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}
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static const struct of_device_id exynos_dp_video_phy_of_match[] = {
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{ .compatible = "samsung,exynos5250-dp-video-phy" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
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static struct platform_driver exynos_dp_video_phy_driver = {
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.probe = exynos_dp_video_phy_probe,
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.driver = {
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.name = "exynos-dp-video-phy",
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.owner = THIS_MODULE,
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.of_match_table = exynos_dp_video_phy_of_match,
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}
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};
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module_platform_driver(exynos_dp_video_phy_driver);
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MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
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MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
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MODULE_LICENSE("GPL v2");
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