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/*
* Exynos PHY driver
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* Author: Tomasz Stanislawski <t.stanislaws@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/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#define EXYNOS_PHY_ENABLE (1 << 0)
static int exynos_phy_power_on(struct phy *phy)
{
void __iomem *reg = phy_get_drvdata(phy);
u32 val;
val = readl(reg);
val |= EXYNOS_PHY_ENABLE;
writel(val, reg);
return 0;
}
static int exynos_phy_power_off(struct phy *phy)
{
void __iomem *reg = phy_get_drvdata(phy);
u32 val;
val = readl(reg);
val &= ~EXYNOS_PHY_ENABLE;
writel(val, reg);
return 0;
}
static struct phy_ops exynos_phy_ops = {
.power_on = exynos_phy_power_on,
.power_off = exynos_phy_power_off,
.owner = THIS_MODULE,
};
static const u32 exynos4210_offsets[] = {
0x0700, /* HDMI_PHY */
0x070C, /* DAC_PHY */
0x0718, /* ADC_PHY */
0x071C, /* PCIE_PHY */
0x0720, /* SATA_PHY */
~0, /* end mark */
};
static const u32 exynos4412_offsets[] = {
0x0700, /* HDMI_PHY */
0x0718, /* ADC_PHY */
~0, /* end mark */
};
static const struct of_device_id exynos_phy_of_match[] = {
{ .compatible = "exynos4210-phy", .data = exynos4210_offsets},
{ .compatible = "exynos4412-phy", .data = exynos4412_offsets},
{ },
};
MODULE_DEVICE_TABLE(of, exynos_phy_of_match);
static struct phy *exynos_phy_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct phy **phys = dev_get_drvdata(dev);
int index = args->args[0];
int i;
/* verify if index is valid */
for (i = 0; i <= index; ++i)
if (!phys[i])
return ERR_PTR(-ENODEV);
return phys[index];
}
static int exynos_phy_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id = of_match_device(
of_match_ptr(exynos_phy_of_match), &pdev->dev);
const u32 *offsets = of_id->data;
int count;
struct device *dev = &pdev->dev;
struct phy **phys;
struct resource *res;
void __iomem *regs;
int i;
struct phy_provider *phy_provider;
/* count number of phys to create */
for (count = 0; offsets[count] != ~0; ++count)
;
phys = devm_kzalloc(dev, (count + 1) * sizeof(phys[0]), GFP_KERNEL);
if (!phys)
return -ENOMEM;
dev_set_drvdata(dev, phys);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap(dev, res->start, res->end - res->start);
if (!regs) {
dev_err(dev, "failed to ioremap registers\n");
return -EFAULT;
}
/* NOTE: last entry in phys[] is NULL */
for (i = 0; i < count; ++i) {
phys[i] = devm_phy_create(dev, &exynos_phy_ops, NULL);
if (IS_ERR(phys[i])) {
dev_err(dev, "failed to create PHY %d\n", i);
return PTR_ERR(phys[i]);
}
phy_set_drvdata(phys[i], regs + offsets[i]);
}
phy_provider = devm_of_phy_provider_register(dev, exynos_phy_xlate);
if (IS_ERR(phy_provider)) {
dev_err(dev, "failed to register PHY provider\n");
return PTR_ERR(phy_provider);
}
dev_info(dev, "added %d phys\n", count);
return 0;
}
static struct platform_driver exynos_phy_driver = {
.probe = exynos_phy_probe,
.driver = {
.of_match_table = exynos_phy_of_match,
.name = "exynos-phy",
.owner = THIS_MODULE,
}
};
module_platform_driver(exynos_phy_driver);
MODULE_DESCRIPTION("Exynos PHY driver");
MODULE_AUTHOR("Tomasz Stanislawski <t.stanislaws@samsung.com>");
MODULE_LICENSE("GPL v2");
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