139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
/*
|
|
* Samsung EXYNOS SoC series Display Port PHY driver
|
|
*
|
|
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
|
|
* Author: Jingoo Han <jg1.han@samsung.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/mfd/syscon/exynos5-pmu.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/phy/phy.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
|
|
struct exynos_dp_video_phy_drvdata {
|
|
u32 phy_ctrl_offset;
|
|
};
|
|
|
|
struct exynos_dp_video_phy {
|
|
struct regmap *regs;
|
|
const struct exynos_dp_video_phy_drvdata *drvdata;
|
|
};
|
|
|
|
static void exynos_dp_video_phy_pwr_isol(struct exynos_dp_video_phy *state,
|
|
unsigned int on)
|
|
{
|
|
unsigned int val;
|
|
|
|
if (IS_ERR(state->regs))
|
|
return;
|
|
|
|
val = on ? 0 : EXYNOS5_PHY_ENABLE;
|
|
|
|
regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
|
|
EXYNOS5_PHY_ENABLE, val);
|
|
}
|
|
|
|
static int exynos_dp_video_phy_power_on(struct phy *phy)
|
|
{
|
|
struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
|
|
|
|
/* Disable power isolation on DP-PHY */
|
|
exynos_dp_video_phy_pwr_isol(state, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int exynos_dp_video_phy_power_off(struct phy *phy)
|
|
{
|
|
struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
|
|
|
|
/* Enable power isolation on DP-PHY */
|
|
exynos_dp_video_phy_pwr_isol(state, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct phy_ops exynos_dp_video_phy_ops = {
|
|
.power_on = exynos_dp_video_phy_power_on,
|
|
.power_off = exynos_dp_video_phy_power_off,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
|
|
.phy_ctrl_offset = EXYNOS5_DPTX_PHY_CONTROL,
|
|
};
|
|
|
|
static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
|
|
.phy_ctrl_offset = EXYNOS5420_DPTX_PHY_CONTROL,
|
|
};
|
|
|
|
static const struct of_device_id exynos_dp_video_phy_of_match[] = {
|
|
{
|
|
.compatible = "samsung,exynos5250-dp-video-phy",
|
|
.data = &exynos5250_dp_video_phy,
|
|
}, {
|
|
.compatible = "samsung,exynos5420-dp-video-phy",
|
|
.data = &exynos5420_dp_video_phy,
|
|
},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
|
|
|
|
static int exynos_dp_video_phy_probe(struct platform_device *pdev)
|
|
{
|
|
struct exynos_dp_video_phy *state;
|
|
struct device *dev = &pdev->dev;
|
|
const struct of_device_id *match;
|
|
struct phy_provider *phy_provider;
|
|
struct phy *phy;
|
|
|
|
state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
|
|
if (!state)
|
|
return -ENOMEM;
|
|
|
|
state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
|
|
"samsung,pmu-syscon");
|
|
if (IS_ERR(state->regs)) {
|
|
dev_err(dev, "Failed to lookup PMU regmap\n");
|
|
return PTR_ERR(state->regs);
|
|
}
|
|
|
|
match = of_match_node(exynos_dp_video_phy_of_match, dev->of_node);
|
|
state->drvdata = match->data;
|
|
|
|
phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops, NULL);
|
|
if (IS_ERR(phy)) {
|
|
dev_err(dev, "failed to create Display Port PHY\n");
|
|
return PTR_ERR(phy);
|
|
}
|
|
phy_set_drvdata(phy, state);
|
|
|
|
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
|
|
|
|
return PTR_ERR_OR_ZERO(phy_provider);
|
|
}
|
|
|
|
static struct platform_driver exynos_dp_video_phy_driver = {
|
|
.probe = exynos_dp_video_phy_probe,
|
|
.driver = {
|
|
.name = "exynos-dp-video-phy",
|
|
.of_match_table = exynos_dp_video_phy_of_match,
|
|
}
|
|
};
|
|
module_platform_driver(exynos_dp_video_phy_driver);
|
|
|
|
MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
|
|
MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
|
|
MODULE_LICENSE("GPL v2");
|