phy-rcar-gen3.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Renesas RCar Gen3 USB PHY driver
*
* Copyright (C) 2018 Marek Vasut <marek.vasut@gmail.com>
*/
#include <common.h>
#include <clk.h>
#include <div64.h>
#include <dm.h>
#include <fdtdec.h>
#include <generic-phy.h>
#include <malloc.h>
#include <reset.h>
#include <syscon.h>
#include <usb.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <power/regulator.h>
/* USB2.0 Host registers (original offset is +0x200) */
#define USB2_INT_ENABLE 0x000
#define USB2_USBCTR 0x00c
#define USB2_SPD_RSM_TIMSET 0x10c
#define USB2_OC_TIMSET 0x110
#define USB2_COMMCTRL 0x600
#define USB2_OBINTSTA 0x604
#define USB2_OBINTEN 0x608
#define USB2_VBCTRL 0x60c
#define USB2_LINECTRL1 0x610
#define USB2_ADPCTRL 0x630
/* USBCTR */
#define USB2_USBCTR_PLL_RST BIT(1)
/* SPD_RSM_TIMSET */
#define USB2_SPD_RSM_TIMSET_INIT 0x014e029b
/* OC_TIMSET */
#define USB2_OC_TIMSET_INIT 0x000209ab
/* COMMCTRL */
#define USB2_COMMCTRL_OTG_PERI BIT(31) /* 1 = Peripheral mode */
/* LINECTRL1 */
#define USB2_LINECTRL1_DP_RPD BIT(18)
#define USB2_LINECTRL1_DM_RPD BIT(16)
/* ADPCTRL */
#define USB2_ADPCTRL_DRVVBUS BIT(4)
struct rcar_gen3_phy {
fdt_addr_t regs;
struct clk clk;
struct udevice *vbus_supply;
};
static int rcar_gen3_phy_phy_init(struct phy *phy)
{
struct rcar_gen3_phy *priv = dev_get_priv(phy->dev);
/* Initialize USB2 part */
writel(0, priv->regs + USB2_INT_ENABLE);
writel(USB2_SPD_RSM_TIMSET_INIT, priv->regs + USB2_SPD_RSM_TIMSET);
writel(USB2_OC_TIMSET_INIT, priv->regs + USB2_OC_TIMSET);
setbits_le32(priv->regs + USB2_LINECTRL1,
USB2_LINECTRL1_DP_RPD | USB2_LINECTRL1_DM_RPD);
clrbits_le32(priv->regs + USB2_COMMCTRL, USB2_COMMCTRL_OTG_PERI);
setbits_le32(priv->regs + USB2_ADPCTRL, USB2_ADPCTRL_DRVVBUS);
return 0;
}
static int rcar_gen3_phy_phy_power_on(struct phy *phy)
{
struct rcar_gen3_phy *priv = dev_get_priv(phy->dev);
int ret;
if (priv->vbus_supply) {
ret = regulator_set_enable(priv->vbus_supply, true);
if (ret)
return ret;
}
setbits_le32(priv->regs + USB2_USBCTR, USB2_USBCTR_PLL_RST);
clrbits_le32(priv->regs + USB2_USBCTR, USB2_USBCTR_PLL_RST);
return 0;
}
static int rcar_gen3_phy_phy_power_off(struct phy *phy)
{
struct rcar_gen3_phy *priv = dev_get_priv(phy->dev);
if (!priv->vbus_supply)
return 0;
return regulator_set_enable(priv->vbus_supply, false);
}
static const struct phy_ops rcar_gen3_phy_phy_ops = {
.init = rcar_gen3_phy_phy_init,
.power_on = rcar_gen3_phy_phy_power_on,
.power_off = rcar_gen3_phy_phy_power_off,
};
static int rcar_gen3_phy_probe(struct udevice *dev)
{
struct rcar_gen3_phy *priv = dev_get_priv(dev);
int ret;
priv->regs = dev_read_addr(dev);
if (priv->regs == FDT_ADDR_T_NONE)
return -EINVAL;
ret = device_get_supply_regulator(dev, "vbus-supply",
&priv->vbus_supply);
if (ret && ret != -ENOENT) {
pr_err("Failed to get PHY regulator\n");
return ret;
}
/* Enable clock */
ret = clk_get_by_index(dev, 0, &priv->clk);
if (ret)
return ret;
ret = clk_enable(&priv->clk);
if (ret)
return ret;
return 0;
}
static int rcar_gen3_phy_remove(struct udevice *dev)
{
struct rcar_gen3_phy *priv = dev_get_priv(dev);
clk_disable(&priv->clk);
clk_free(&priv->clk);
return 0;
}
static const struct udevice_id rcar_gen3_phy_of_match[] = {
{ .compatible = "renesas,rcar-gen3-usb2-phy", },
{ },
};
U_BOOT_DRIVER(rcar_gen3_phy) = {
.name = "rcar-gen3-phy",
.id = UCLASS_PHY,
.of_match = rcar_gen3_phy_of_match,
.ops = &rcar_gen3_phy_phy_ops,
.probe = rcar_gen3_phy_probe,
.remove = rcar_gen3_phy_remove,
.priv_auto_alloc_size = sizeof(struct rcar_gen3_phy),
};