cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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phy-exynos-dp-video.c (3277B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Samsung Exynos SoC series Display Port PHY driver
      4 *
      5 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
      6 * Author: Jingoo Han <jg1.han@samsung.com>
      7 */
      8
      9#include <linux/err.h>
     10#include <linux/io.h>
     11#include <linux/kernel.h>
     12#include <linux/module.h>
     13#include <linux/mfd/syscon.h>
     14#include <linux/of.h>
     15#include <linux/of_address.h>
     16#include <linux/of_device.h>
     17#include <linux/phy/phy.h>
     18#include <linux/platform_device.h>
     19#include <linux/regmap.h>
     20#include <linux/soc/samsung/exynos-regs-pmu.h>
     21
     22struct exynos_dp_video_phy_drvdata {
     23	u32 phy_ctrl_offset;
     24};
     25
     26struct exynos_dp_video_phy {
     27	struct regmap *regs;
     28	const struct exynos_dp_video_phy_drvdata *drvdata;
     29};
     30
     31static int exynos_dp_video_phy_power_on(struct phy *phy)
     32{
     33	struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
     34
     35	/* Disable power isolation on DP-PHY */
     36	return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
     37				  EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
     38}
     39
     40static int exynos_dp_video_phy_power_off(struct phy *phy)
     41{
     42	struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
     43
     44	/* Enable power isolation on DP-PHY */
     45	return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
     46				  EXYNOS4_PHY_ENABLE, 0);
     47}
     48
     49static const struct phy_ops exynos_dp_video_phy_ops = {
     50	.power_on	= exynos_dp_video_phy_power_on,
     51	.power_off	= exynos_dp_video_phy_power_off,
     52	.owner		= THIS_MODULE,
     53};
     54
     55static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
     56	.phy_ctrl_offset	= EXYNOS5_DPTX_PHY_CONTROL,
     57};
     58
     59static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
     60	.phy_ctrl_offset	= EXYNOS5420_DPTX_PHY_CONTROL,
     61};
     62
     63static const struct of_device_id exynos_dp_video_phy_of_match[] = {
     64	{
     65		.compatible = "samsung,exynos5250-dp-video-phy",
     66		.data = &exynos5250_dp_video_phy,
     67	}, {
     68		.compatible = "samsung,exynos5420-dp-video-phy",
     69		.data = &exynos5420_dp_video_phy,
     70	},
     71	{ },
     72};
     73MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
     74
     75static int exynos_dp_video_phy_probe(struct platform_device *pdev)
     76{
     77	struct exynos_dp_video_phy *state;
     78	struct device *dev = &pdev->dev;
     79	struct phy_provider *phy_provider;
     80	struct phy *phy;
     81
     82	state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
     83	if (!state)
     84		return -ENOMEM;
     85
     86	state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
     87						      "samsung,pmu-syscon");
     88	if (IS_ERR(state->regs)) {
     89		dev_err(dev, "Failed to lookup PMU regmap\n");
     90		return PTR_ERR(state->regs);
     91	}
     92
     93	state->drvdata = of_device_get_match_data(dev);
     94
     95	phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
     96	if (IS_ERR(phy)) {
     97		dev_err(dev, "failed to create Display Port PHY\n");
     98		return PTR_ERR(phy);
     99	}
    100	phy_set_drvdata(phy, state);
    101
    102	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
    103
    104	return PTR_ERR_OR_ZERO(phy_provider);
    105}
    106
    107static struct platform_driver exynos_dp_video_phy_driver = {
    108	.probe	= exynos_dp_video_phy_probe,
    109	.driver = {
    110		.name	= "exynos-dp-video-phy",
    111		.of_match_table	= exynos_dp_video_phy_of_match,
    112		.suppress_bind_attrs = true,
    113	}
    114};
    115module_platform_driver(exynos_dp_video_phy_driver);
    116
    117MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
    118MODULE_DESCRIPTION("Samsung Exynos SoC DP PHY driver");
    119MODULE_LICENSE("GPL v2");