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Samsung PHY drivers control the power to the SoC core components needed by their client devices (USB HCDs, SATA, camera ISP bridge, DP encoder) to properly operate. Disabling PHYs in runtime usually causes the client device to crash with external abort exception or similar issue due to lack of API to notify clients about PHY removal. This patch removes the possiblity to unbind Samsung Exynos PHY drivers in runtime. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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/mfd/syscon.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/soc/samsung/exynos-regs-pmu.h>
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struct exynos_dp_video_phy_drvdata {
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u32 phy_ctrl_offset;
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};
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struct exynos_dp_video_phy {
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struct regmap *regs;
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const struct exynos_dp_video_phy_drvdata *drvdata;
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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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/* Disable power isolation on DP-PHY */
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return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
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EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
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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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/* Enable power isolation on DP-PHY */
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return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
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EXYNOS4_PHY_ENABLE, 0);
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}
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static const 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 const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
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.phy_ctrl_offset = EXYNOS5_DPTX_PHY_CONTROL,
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};
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static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
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.phy_ctrl_offset = EXYNOS5420_DPTX_PHY_CONTROL,
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};
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static const struct of_device_id exynos_dp_video_phy_of_match[] = {
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{
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.compatible = "samsung,exynos5250-dp-video-phy",
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.data = &exynos5250_dp_video_phy,
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}, {
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.compatible = "samsung,exynos5420-dp-video-phy",
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.data = &exynos5420_dp_video_phy,
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},
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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 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 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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state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
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"samsung,pmu-syscon");
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if (IS_ERR(state->regs)) {
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dev_err(dev, "Failed to lookup PMU regmap\n");
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return PTR_ERR(state->regs);
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}
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state->drvdata = of_device_get_match_data(dev);
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phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
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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 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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.of_match_table = exynos_dp_video_phy_of_match,
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.suppress_bind_attrs = true,
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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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