mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-09 04:06:38 +07:00
3f8da2e36c
This driver adds support for USB (1.1 and 2.0) phy for STiH415 and STiH416 System-On-Chips from STMicroelectronics. Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com> Signed-off-by: Peter Griffin <peter.griffin@linaro.org> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
188 lines
4.6 KiB
C
188 lines
4.6 KiB
C
/*
|
|
* Copyright (C) 2014 STMicroelectronics
|
|
*
|
|
* STMicroelectronics PHY driver for STiH41x USB.
|
|
*
|
|
* Author: Maxime Coquelin <maxime.coquelin@st.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/platform_device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/phy/phy.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/mfd/syscon.h>
|
|
|
|
#define SYSCFG332 0x80
|
|
#define SYSCFG2520 0x820
|
|
|
|
/**
|
|
* struct stih41x_usb_cfg - SoC specific PHY register mapping
|
|
* @syscfg: Offset in syscfg registers bank
|
|
* @cfg_mask: Bits mask for PHY configuration
|
|
* @cfg: Static configuration value for PHY
|
|
* @oscok: Notify the PHY oscillator clock is ready
|
|
* Setting this bit enable the PHY
|
|
*/
|
|
struct stih41x_usb_cfg {
|
|
u32 syscfg;
|
|
u32 cfg_mask;
|
|
u32 cfg;
|
|
u32 oscok;
|
|
};
|
|
|
|
/**
|
|
* struct stih41x_usb_phy - Private data for the PHY
|
|
* @dev: device for this controller
|
|
* @regmap: Syscfg registers bank in which PHY is configured
|
|
* @cfg: SoC specific PHY register mapping
|
|
* @clk: Oscillator used by the PHY
|
|
*/
|
|
struct stih41x_usb_phy {
|
|
struct device *dev;
|
|
struct regmap *regmap;
|
|
const struct stih41x_usb_cfg *cfg;
|
|
struct clk *clk;
|
|
};
|
|
|
|
static struct stih41x_usb_cfg stih415_usb_phy_cfg = {
|
|
.syscfg = SYSCFG332,
|
|
.cfg_mask = 0x3f,
|
|
.cfg = 0x38,
|
|
.oscok = BIT(6),
|
|
};
|
|
|
|
static struct stih41x_usb_cfg stih416_usb_phy_cfg = {
|
|
.syscfg = SYSCFG2520,
|
|
.cfg_mask = 0x33f,
|
|
.cfg = 0x238,
|
|
.oscok = BIT(6),
|
|
};
|
|
|
|
static int stih41x_usb_phy_init(struct phy *phy)
|
|
{
|
|
struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
|
|
|
|
return regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
|
|
phy_dev->cfg->cfg_mask, phy_dev->cfg->cfg);
|
|
}
|
|
|
|
static int stih41x_usb_phy_power_on(struct phy *phy)
|
|
{
|
|
struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(phy_dev->clk);
|
|
if (ret) {
|
|
dev_err(phy_dev->dev, "Failed to enable osc_phy clock\n");
|
|
return ret;
|
|
}
|
|
|
|
return regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
|
|
phy_dev->cfg->oscok, phy_dev->cfg->oscok);
|
|
}
|
|
|
|
static int stih41x_usb_phy_power_off(struct phy *phy)
|
|
{
|
|
struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
|
|
int ret;
|
|
|
|
ret = regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
|
|
phy_dev->cfg->oscok, 0);
|
|
if (ret) {
|
|
dev_err(phy_dev->dev, "Failed to clear oscok bit\n");
|
|
return ret;
|
|
}
|
|
|
|
clk_disable_unprepare(phy_dev->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct phy_ops stih41x_usb_phy_ops = {
|
|
.init = stih41x_usb_phy_init,
|
|
.power_on = stih41x_usb_phy_power_on,
|
|
.power_off = stih41x_usb_phy_power_off,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static const struct of_device_id stih41x_usb_phy_of_match[];
|
|
|
|
static int stih41x_usb_phy_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
const struct of_device_id *match;
|
|
struct stih41x_usb_phy *phy_dev;
|
|
struct device *dev = &pdev->dev;
|
|
struct phy_provider *phy_provider;
|
|
struct phy *phy;
|
|
|
|
phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
|
|
if (!phy_dev)
|
|
return -ENOMEM;
|
|
|
|
match = of_match_device(stih41x_usb_phy_of_match, &pdev->dev);
|
|
if (!match)
|
|
return -ENODEV;
|
|
|
|
phy_dev->cfg = match->data;
|
|
|
|
phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
|
|
if (IS_ERR(phy_dev->regmap)) {
|
|
dev_err(dev, "No syscfg phandle specified\n");
|
|
return PTR_ERR(phy_dev->regmap);
|
|
}
|
|
|
|
phy_dev->clk = devm_clk_get(dev, "osc_phy");
|
|
if (IS_ERR(phy_dev->clk)) {
|
|
dev_err(dev, "osc_phy clk not found\n");
|
|
return PTR_ERR(phy_dev->clk);
|
|
}
|
|
|
|
phy = devm_phy_create(dev, NULL, &stih41x_usb_phy_ops, NULL);
|
|
|
|
if (IS_ERR(phy)) {
|
|
dev_err(dev, "failed to create phy\n");
|
|
return PTR_ERR(phy);
|
|
}
|
|
|
|
phy_dev->dev = dev;
|
|
|
|
phy_set_drvdata(phy, phy_dev);
|
|
|
|
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
|
|
if (IS_ERR(phy_provider))
|
|
return PTR_ERR(phy_provider);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id stih41x_usb_phy_of_match[] = {
|
|
{ .compatible = "st,stih415-usb-phy", .data = &stih415_usb_phy_cfg },
|
|
{ .compatible = "st,stih416-usb-phy", .data = &stih416_usb_phy_cfg },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, stih41x_usb_phy_of_match);
|
|
|
|
static struct platform_driver stih41x_usb_phy_driver = {
|
|
.probe = stih41x_usb_phy_probe,
|
|
.driver = {
|
|
.name = "stih41x-usb-phy",
|
|
.of_match_table = stih41x_usb_phy_of_match,
|
|
}
|
|
};
|
|
module_platform_driver(stih41x_usb_phy_driver);
|
|
|
|
MODULE_AUTHOR("Maxime Coquelin <maxime.coquelin@st.com>");
|
|
MODULE_DESCRIPTION("STMicroelectronics USB PHY driver for STiH41x series");
|
|
MODULE_LICENSE("GPL v2");
|