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// SPDX-License-Identifier: GPL-2.0+
/*
* Allwinner sun50i(H6) USB 3.0 phy driver
*
* Copyright (C) 2020 Samuel Holland <samuel@sholland.org>
*
* Based on the Linux driver, which is:
*
* Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
*
* Based on phy-sun9i-usb.c, which is:
*
* Copyright (C) 2014-2015 Chen-Yu Tsai <wens@csie.org>
*
* Based on code from Allwinner BSP, which is:
*
* Copyright (c) 2010-2015 Allwinner Technology Co., Ltd.
*/
#include <asm/io.h>
#include <clk.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <generic-phy.h>
#include <linux/bitops.h>
#include <reset.h>
/* Interface Status and Control Registers */
#define SUNXI_ISCR 0x00
#define SUNXI_PIPE_CLOCK_CONTROL 0x14
#define SUNXI_PHY_TUNE_LOW 0x18
#define SUNXI_PHY_TUNE_HIGH 0x1c
#define SUNXI_PHY_EXTERNAL_CONTROL 0x20
/* USB2.0 Interface Status and Control Register */
#define SUNXI_ISCR_FORCE_VBUS (3 << 12)
/* PIPE Clock Control Register */
#define SUNXI_PCC_PIPE_CLK_OPEN (1 << 6)
/* PHY External Control Register */
#define SUNXI_PEC_EXTERN_VBUS (3 << 1)
#define SUNXI_PEC_SSC_EN (1 << 24)
#define SUNXI_PEC_REF_SSP_EN (1 << 26)
/* PHY Tune High Register */
#define SUNXI_TX_DEEMPH_3P5DB(n) ((n) << 19)
#define SUNXI_TX_DEEMPH_3P5DB_MASK GENMASK(24, 19)
#define SUNXI_TX_DEEMPH_6DB(n) ((n) << 13)
#define SUNXI_TX_DEEMPH_6GB_MASK GENMASK(18, 13)
#define SUNXI_TX_SWING_FULL(n) ((n) << 6)
#define SUNXI_TX_SWING_FULL_MASK GENMASK(12, 6)
#define SUNXI_LOS_BIAS(n) ((n) << 3)
#define SUNXI_LOS_BIAS_MASK GENMASK(5, 3)
#define SUNXI_TXVBOOSTLVL(n) ((n) << 0)
#define SUNXI_TXVBOOSTLVL_MASK GENMASK(2, 0)
struct sun50i_usb3_phy_priv {
void __iomem *regs;
struct reset_ctl reset;
struct clk clk;
};
static void sun50i_usb3_phy_open(struct sun50i_usb3_phy_priv *phy)
{
u32 val;
val = readl(phy->regs + SUNXI_PHY_EXTERNAL_CONTROL);
val |= SUNXI_PEC_EXTERN_VBUS;
val |= SUNXI_PEC_SSC_EN | SUNXI_PEC_REF_SSP_EN;
writel(val, phy->regs + SUNXI_PHY_EXTERNAL_CONTROL);
val = readl(phy->regs + SUNXI_PIPE_CLOCK_CONTROL);
val |= SUNXI_PCC_PIPE_CLK_OPEN;
writel(val, phy->regs + SUNXI_PIPE_CLOCK_CONTROL);
val = readl(phy->regs + SUNXI_ISCR);
val |= SUNXI_ISCR_FORCE_VBUS;
writel(val, phy->regs + SUNXI_ISCR);
/*
* All the magic numbers written to the PHY_TUNE_{LOW_HIGH}
* registers are directly taken from the BSP USB3 driver from
* Allwiner.
*/
writel(0x0047fc87, phy->regs + SUNXI_PHY_TUNE_LOW);
val = readl(phy->regs + SUNXI_PHY_TUNE_HIGH);
val &= ~(SUNXI_TXVBOOSTLVL_MASK | SUNXI_LOS_BIAS_MASK |
SUNXI_TX_SWING_FULL_MASK | SUNXI_TX_DEEMPH_6GB_MASK |
SUNXI_TX_DEEMPH_3P5DB_MASK);
val |= SUNXI_TXVBOOSTLVL(0x7);
val |= SUNXI_LOS_BIAS(0x7);
val |= SUNXI_TX_SWING_FULL(0x55);
val |= SUNXI_TX_DEEMPH_6DB(0x20);
val |= SUNXI_TX_DEEMPH_3P5DB(0x15);
writel(val, phy->regs + SUNXI_PHY_TUNE_HIGH);
}
static int sun50i_usb3_phy_init(struct phy *phy)
{
struct sun50i_usb3_phy_priv *priv = dev_get_priv(phy->dev);
int ret;
ret = clk_prepare_enable(&priv->clk);
if (ret)
return ret;
ret = reset_deassert(&priv->reset);
if (ret) {
clk_disable_unprepare(&priv->clk);
return ret;
}
sun50i_usb3_phy_open(priv);
return 0;
}
static int sun50i_usb3_phy_exit(struct phy *phy)
{
struct sun50i_usb3_phy_priv *priv = dev_get_priv(phy->dev);
reset_assert(&priv->reset);
clk_disable_unprepare(&priv->clk);
return 0;
}
static const struct phy_ops sun50i_usb3_phy_ops = {
.init = sun50i_usb3_phy_init,
.exit = sun50i_usb3_phy_exit,
};
static int sun50i_usb3_phy_probe(struct udevice *dev)
{
struct sun50i_usb3_phy_priv *priv = dev_get_priv(dev);
int ret;
ret = clk_get_by_index(dev, 0, &priv->clk);
if (ret) {
dev_err(dev, "failed to get phy clock\n");
return ret;
}
ret = reset_get_by_index(dev, 0, &priv->reset);
if (ret) {
dev_err(dev, "failed to get reset control\n");
return ret;
}
priv->regs = (void __iomem *)dev_read_addr(dev);
if (IS_ERR(priv->regs))
return PTR_ERR(priv->regs);
return 0;
}
static const struct udevice_id sun50i_usb3_phy_ids[] = {
{ .compatible = "allwinner,sun50i-h6-usb3-phy" },
{ },
};
U_BOOT_DRIVER(sun50i_usb3_phy) = {
.name = "sun50i-usb3-phy",
.id = UCLASS_PHY,
.of_match = sun50i_usb3_phy_ids,
.ops = &sun50i_usb3_phy_ops,
.probe = sun50i_usb3_phy_probe,
.priv_auto = sizeof(struct sun50i_usb3_phy_priv),
};
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