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// SPDX-License-Identifier: GPL-2.0
/*
* Renesas RCar Gen2 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 <reset.h>
#include <syscon.h>
#include <usb.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <power/regulator.h>
#define USBHS_LPSTS 0x02
#define USBHS_UGCTRL 0x80
#define USBHS_UGCTRL2 0x84
#define USBHS_UGSTS 0x88 /* From technical update */
/* Low Power Status register (LPSTS) */
#define USBHS_LPSTS_SUSPM 0x4000
/* USB General control register (UGCTRL) */
#define USBHS_UGCTRL_CONNECT BIT(2)
#define USBHS_UGCTRL_PLLRESET BIT(0)
/* USB General control register 2 (UGCTRL2) */
#define USBHS_UGCTRL2_USB2SEL 0x80000000
#define USBHS_UGCTRL2_USB2SEL_PCI 0x00000000
#define USBHS_UGCTRL2_USB2SEL_USB30 0x80000000
#define USBHS_UGCTRL2_USB0SEL 0x00000030
#define USBHS_UGCTRL2_USB0SEL_PCI 0x00000010
#define USBHS_UGCTRL2_USB0SEL_HS_USB 0x00000030
/* USB General status register (UGSTS) */
#define USBHS_UGSTS_LOCK 0x00000100 /* From technical update */
#define PHYS_PER_CHANNEL 2
struct rcar_gen2_phy {
fdt_addr_t regs;
struct clk clk;
};
static int rcar_gen2_phy_phy_init(struct phy *phy)
{
struct rcar_gen2_phy *priv = dev_get_priv(phy->dev);
u16 chan = phy->id & 0xffff;
u16 mode = (phy->id >> 16) & 0xffff;
u32 clrmask, setmask;
if (chan == 0) {
clrmask = USBHS_UGCTRL2_USB0SEL;
setmask = mode ? USBHS_UGCTRL2_USB0SEL_HS_USB :
USBHS_UGCTRL2_USB0SEL_PCI;
} else {
clrmask = USBHS_UGCTRL2_USB2SEL;
setmask = mode ? USBHS_UGCTRL2_USB2SEL_USB30 :
USBHS_UGCTRL2_USB2SEL_PCI;
}
clrsetbits_le32(priv->regs + USBHS_UGCTRL2, clrmask, setmask);
return 0;
}
static int rcar_gen2_phy_phy_power_on(struct phy *phy)
{
struct rcar_gen2_phy *priv = dev_get_priv(phy->dev);
int i;
u32 value;
/* Power on USBHS PHY */
clrbits_le32(priv->regs + USBHS_UGCTRL, USBHS_UGCTRL_PLLRESET);
setbits_le16(priv->regs + USBHS_LPSTS, USBHS_LPSTS_SUSPM);
for (i = 0; i < 20; i++) {
value = readl(priv->regs + USBHS_UGSTS);
if ((value & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) {
setbits_le32(priv->regs + USBHS_UGCTRL,
USBHS_UGCTRL_CONNECT);
return 0;
}
udelay(1);
}
return -ETIMEDOUT;
}
static int rcar_gen2_phy_phy_power_off(struct phy *phy)
{
struct rcar_gen2_phy *priv = dev_get_priv(phy->dev);
/* Power off USBHS PHY */
clrbits_le32(priv->regs + USBHS_UGCTRL, USBHS_UGCTRL_CONNECT);
clrbits_le16(priv->regs + USBHS_LPSTS, USBHS_LPSTS_SUSPM);
setbits_le32(priv->regs + USBHS_UGCTRL, USBHS_UGCTRL_PLLRESET);
return 0;
}
static int rcar_gen2_phy_of_xlate(struct phy *phy,
struct ofnode_phandle_args *args)
{
if (args->args_count != 2) {
dev_err(phy->dev, "Invalid DT PHY argument count: %d\n",
args->args_count);
return -EINVAL;
}
if (args->args[0] != 0 && args->args[0] != 2) {
dev_err(phy->dev, "Invalid DT PHY channel: %d\n",
args->args[0]);
return -EINVAL;
}
if (args->args[1] != 0 && args->args[1] != 1) {
dev_err(phy->dev, "Invalid DT PHY mode: %d\n",
args->args[1]);
return -EINVAL;
}
if (args->args_count)
phy->id = args->args[0] | (args->args[1] << 16);
else
phy->id = 0;
return 0;
}
static const struct phy_ops rcar_gen2_phy_phy_ops = {
.init = rcar_gen2_phy_phy_init,
.power_on = rcar_gen2_phy_phy_power_on,
.power_off = rcar_gen2_phy_phy_power_off,
.of_xlate = rcar_gen2_phy_of_xlate,
};
static int rcar_gen2_phy_probe(struct udevice *dev)
{
struct rcar_gen2_phy *priv = dev_get_priv(dev);
int ret;
priv->regs = dev_read_addr(dev);
if (priv->regs == FDT_ADDR_T_NONE)
return -EINVAL;
/* 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_gen2_phy_remove(struct udevice *dev)
{
struct rcar_gen2_phy *priv = dev_get_priv(dev);
clk_disable(&priv->clk);
clk_free(&priv->clk);
return 0;
}
static const struct udevice_id rcar_gen2_phy_of_match[] = {
{ .compatible = "renesas,rcar-gen2-usb-phy", },
{ },
};
U_BOOT_DRIVER(rcar_gen2_phy) = {
.name = "rcar-gen2-phy",
.id = UCLASS_PHY,
.of_match = rcar_gen2_phy_of_match,
.ops = &rcar_gen2_phy_phy_ops,
.probe = rcar_gen2_phy_probe,
.remove = rcar_gen2_phy_remove,
.priv_auto_alloc_size = sizeof(struct rcar_gen2_phy),
};
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