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/*
* Copyright (c) 2016 Sascha Hauer <s.hauer@pengutronix.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <common.h>
#include <init.h>
#include <of.h>
#include <errno.h>
#include <driver.h>
#include <malloc.h>
#include <usb/phy.h>
#include <linux/phy/phy.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <gpio.h>
#include <of_gpio.h>
struct nop_usbphy {
struct usb_phy usb_phy;
struct phy *phy;
struct phy_provider *provider;
struct clk *clk;
int reset;
};
static struct phy *nop_usbphy_xlate(struct device_d *dev,
struct of_phandle_args *args)
{
struct nop_usbphy *nopphy = dev->priv;
return nopphy->phy;
}
static int nop_usbphy_init(struct phy *phy)
{
int ret;
struct nop_usbphy *nopphy = phy_get_drvdata(phy);
ret = clk_enable(nopphy->clk);
if (ret < 0)
return ret;
if (gpio_is_valid(nopphy->reset)) {
/*
* Let's wait for 100 ms before deasserting reset line
*/
mdelay(100);
gpio_set_active(nopphy->reset, false);
}
return 0;
}
static struct usb_phy *nop_usbphy_to_usbphy(struct phy *phy)
{
struct nop_usbphy *nopphy = phy_get_drvdata(phy);
return &nopphy->usb_phy;
}
static const struct phy_ops nop_phy_ops = {
.to_usbphy = nop_usbphy_to_usbphy,
.init = nop_usbphy_init,
};
static int nop_usbphy_probe(struct device_d *dev)
{
int ret;
struct nop_usbphy *nopphy;
enum of_gpio_flags of_flags;
char *name = NULL;
unsigned long flags = GPIOF_OUT_INIT_ACTIVE;
nopphy = xzalloc(sizeof(*nopphy));
dev->priv = nopphy;
nopphy->clk = clk_get(dev, "main_clk");
if (IS_ERR(nopphy->clk))
nopphy->clk = NULL;
nopphy->reset = of_get_named_gpio_flags(dev->device_node,
"reset-gpios", 0, &of_flags);
if (gpio_is_valid(nopphy->reset)) {
/* assert reset */
if (of_flags & OF_GPIO_ACTIVE_LOW)
flags |= GPIOF_ACTIVE_LOW;
name = basprintf("%s reset", dev_name(dev));
ret = gpio_request_one(nopphy->reset, flags, name);
if (ret < 0)
goto err_free;
}
/* FIXME: Add vbus regulator support */
/* FIXME: Add vbus-detect-gpio support */
nopphy->usb_phy.dev = dev;
nopphy->phy = phy_create(dev, NULL, &nop_phy_ops, NULL);
if (IS_ERR(nopphy->phy)) {
ret = PTR_ERR(nopphy->phy);
goto release_gpio;
}
phy_set_drvdata(nopphy->phy, nopphy);
nopphy->provider = of_phy_provider_register(dev, nop_usbphy_xlate);
if (IS_ERR(nopphy->provider)) {
ret = PTR_ERR(nopphy->provider);
goto release_gpio;
}
return 0;
release_gpio:
if (gpio_is_valid(nopphy->reset))
gpio_free(nopphy->reset);
err_free:
free(nopphy);
free(name);
return ret;
};
static __maybe_unused struct of_device_id nop_usbphy_dt_ids[] = {
{
.compatible = "usb-nop-xceiv",
}, {
/* sentinel */
},
};
static struct driver_d nop_usbphy_driver = {
.name = "usb-nop-xceiv",
.probe = nop_usbphy_probe,
.of_compatible = DRV_OF_COMPAT(nop_usbphy_dt_ids),
};
static int nop_usbphy_driver_init(void)
{
return platform_driver_register(&nop_usbphy_driver);
}
fs_initcall(nop_usbphy_driver_init);
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