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/*
* Samsung SoC USB 1.1/2.0 PHY driver
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* Author: Kamil Debski <k.debski@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/clk.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include "phy-samsung-usb2.h"
static int samsung_usb2_phy_power_on(struct phy *phy)
{
struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
struct samsung_usb2_phy_driver *drv = inst->drv;
int ret;
dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
inst->cfg->label);
ret = clk_prepare_enable(drv->clk);
if (ret)
goto err_main_clk;
ret = clk_prepare_enable(drv->ref_clk);
if (ret)
goto err_instance_clk;
if (inst->cfg->power_on) {
spin_lock(&drv->lock);
ret = inst->cfg->power_on(inst);
spin_unlock(&drv->lock);
}
return 0;
err_instance_clk:
clk_disable_unprepare(drv->clk);
err_main_clk:
return ret;
}
static int samsung_usb2_phy_power_off(struct phy *phy)
{
struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
struct samsung_usb2_phy_driver *drv = inst->drv;
int ret = 0;
dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
inst->cfg->label);
if (inst->cfg->power_off) {
spin_lock(&drv->lock);
ret = inst->cfg->power_off(inst);
spin_unlock(&drv->lock);
}
clk_disable_unprepare(drv->ref_clk);
clk_disable_unprepare(drv->clk);
return ret;
}
static struct phy_ops samsung_usb2_phy_ops = {
.power_on = samsung_usb2_phy_power_on,
.power_off = samsung_usb2_phy_power_off,
.owner = THIS_MODULE,
};
static struct phy *samsung_usb2_phy_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct samsung_usb2_phy_driver *drv;
drv = dev_get_drvdata(dev);
if (!drv)
return ERR_PTR(-EINVAL);
if (WARN_ON(args->args[0] >= drv->cfg->num_phys))
return ERR_PTR(-ENODEV);
return drv->instances[args->args[0]].phy;
}
static const struct of_device_id samsung_usb2_phy_of_match[] = {
#ifdef CONFIG_PHY_EXYNOS4210_USB2
{
.compatible = "samsung,exynos4210-usb2-phy",
.data = &exynos4210_usb2_phy_config,
},
#endif
#ifdef CONFIG_PHY_EXYNOS4X12_USB2
{
.compatible = "samsung,exynos4x12-usb2-phy",
.data = &exynos4x12_usb2_phy_config,
},
#endif
{ },
};
static int samsung_usb2_phy_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
const struct samsung_usb2_phy_config *cfg;
struct device *dev = &pdev->dev;
struct phy_provider *phy_provider;
struct resource *mem;
struct samsung_usb2_phy_driver *drv;
int i, ret;
if (!pdev->dev.of_node) {
dev_err(dev, "This driver is required to be instantiated from device tree\n");
return -EINVAL;
}
match = of_match_node(samsung_usb2_phy_of_match, pdev->dev.of_node);
if (!match) {
dev_err(dev, "of_match_node() failed\n");
return -EINVAL;
}
cfg = match->data;
drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) +
cfg->num_phys * sizeof(struct samsung_usb2_phy_instance),
GFP_KERNEL);
if (!drv)
return -ENOMEM;
dev_set_drvdata(dev, drv);
spin_lock_init(&drv->lock);
drv->cfg = cfg;
drv->dev = dev;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
drv->reg_phy = devm_ioremap_resource(dev, mem);
if (IS_ERR(drv->reg_phy)) {
dev_err(dev, "Failed to map register memory (phy)\n");
return PTR_ERR(drv->reg_phy);
}
drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
"samsung,pmureg-phandle");
if (IS_ERR(drv->reg_pmu)) {
dev_err(dev, "Failed to map PMU registers (via syscon)\n");
return PTR_ERR(drv->reg_pmu);
}
if (drv->cfg->has_mode_switch) {
drv->reg_sys = syscon_regmap_lookup_by_phandle(
pdev->dev.of_node, "samsung,sysreg-phandle");
if (IS_ERR(drv->reg_sys)) {
dev_err(dev, "Failed to map system registers (via syscon)\n");
return PTR_ERR(drv->reg_sys);
}
}
drv->clk = devm_clk_get(dev, "phy");
if (IS_ERR(drv->clk)) {
dev_err(dev, "Failed to get clock of phy controller\n");
return PTR_ERR(drv->clk);
}
drv->ref_clk = devm_clk_get(dev, "ref");
if (IS_ERR(drv->ref_clk)) {
dev_err(dev, "Failed to get reference clock for the phy controller\n");
return PTR_ERR(drv->ref_clk);
}
drv->ref_rate = clk_get_rate(drv->ref_clk);
if (drv->cfg->rate_to_clk) {
ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);
if (ret)
return ret;
}
for (i = 0; i < drv->cfg->num_phys; i++) {
char *label = drv->cfg->phys[i].label;
struct samsung_usb2_phy_instance *p = &drv->instances[i];
dev_dbg(dev, "Creating phy \"%s\"\n", label);
p->phy = devm_phy_create(dev, &samsung_usb2_phy_ops, NULL);
if (IS_ERR(p->phy)) {
dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",
label);
return PTR_ERR(p->phy);
}
p->cfg = &drv->cfg->phys[i];
p->drv = drv;
phy_set_bus_width(p->phy, 8);
phy_set_drvdata(p->phy, p);
}
phy_provider = devm_of_phy_provider_register(dev,
samsung_usb2_phy_xlate);
if (IS_ERR(phy_provider)) {
dev_err(drv->dev, "Failed to register phy provider\n");
return PTR_ERR(phy_provider);
}
return 0;
}
static struct platform_driver samsung_usb2_phy_driver = {
.probe = samsung_usb2_phy_probe,
.driver = {
.of_match_table = samsung_usb2_phy_of_match,
.name = "samsung-usb2-phy",
.owner = THIS_MODULE,
}
};
module_platform_driver(samsung_usb2_phy_driver);
MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver");
MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:samsung-usb2-phy");
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