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// SPDX-License-Identifier: GPL-2.0
/*
* Ingenic JZ4770 USB PHY driver
* Copyright (c) Paul Cercueil <paul@crapouillou.net>
*/
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/usb/otg.h>
#include <linux/usb/phy.h>
#define REG_USBPCR_OFFSET 0x00
#define REG_USBRDT_OFFSET 0x04
#define REG_USBVBFIL_OFFSET 0x08
#define REG_USBPCR1_OFFSET 0x0c
/* USBPCR */
#define USBPCR_USB_MODE BIT(31)
#define USBPCR_AVLD_REG BIT(30)
#define USBPCR_INCRM BIT(27)
#define USBPCR_CLK12_EN BIT(26)
#define USBPCR_COMMONONN BIT(25)
#define USBPCR_VBUSVLDEXT BIT(24)
#define USBPCR_VBUSVLDEXTSEL BIT(23)
#define USBPCR_POR BIT(22)
#define USBPCR_SIDDQ BIT(21)
#define USBPCR_OTG_DISABLE BIT(20)
#define USBPCR_TXPREEMPHTUNE BIT(6)
#define USBPCR_IDPULLUP_LSB 28
#define USBPCR_IDPULLUP_MASK GENMASK(29, USBPCR_IDPULLUP_LSB)
#define USBPCR_IDPULLUP_ALWAYS (3 << USBPCR_IDPULLUP_LSB)
#define USBPCR_IDPULLUP_SUSPEND (1 << USBPCR_IDPULLUP_LSB)
#define USBPCR_IDPULLUP_OTG (0 << USBPCR_IDPULLUP_LSB)
#define USBPCR_COMPDISTUNE_LSB 17
#define USBPCR_COMPDISTUNE_MASK GENMASK(19, USBPCR_COMPDISTUNE_LSB)
#define USBPCR_COMPDISTUNE_DFT 4
#define USBPCR_OTGTUNE_LSB 14
#define USBPCR_OTGTUNE_MASK GENMASK(16, USBPCR_OTGTUNE_LSB)
#define USBPCR_OTGTUNE_DFT 4
#define USBPCR_SQRXTUNE_LSB 11
#define USBPCR_SQRXTUNE_MASK GENMASK(13, USBPCR_SQRXTUNE_LSB)
#define USBPCR_SQRXTUNE_DFT 3
#define USBPCR_TXFSLSTUNE_LSB 7
#define USBPCR_TXFSLSTUNE_MASK GENMASK(10, USBPCR_TXFSLSTUNE_LSB)
#define USBPCR_TXFSLSTUNE_DFT 3
#define USBPCR_TXRISETUNE_LSB 4
#define USBPCR_TXRISETUNE_MASK GENMASK(5, USBPCR_TXRISETUNE_LSB)
#define USBPCR_TXRISETUNE_DFT 3
#define USBPCR_TXVREFTUNE_LSB 0
#define USBPCR_TXVREFTUNE_MASK GENMASK(3, USBPCR_TXVREFTUNE_LSB)
#define USBPCR_TXVREFTUNE_DFT 5
/* USBRDT */
#define USBRDT_VBFIL_LD_EN BIT(25)
#define USBRDT_IDDIG_EN BIT(24)
#define USBRDT_IDDIG_REG BIT(23)
#define USBRDT_USBRDT_LSB 0
#define USBRDT_USBRDT_MASK GENMASK(22, USBRDT_USBRDT_LSB)
/* USBPCR1 */
#define USBPCR1_UHC_POWON BIT(5)
struct jz4770_phy {
struct usb_phy phy;
struct usb_otg otg;
struct device *dev;
void __iomem *base;
struct clk *clk;
struct regulator *vcc_supply;
};
static inline struct jz4770_phy *otg_to_jz4770_phy(struct usb_otg *otg)
{
return container_of(otg, struct jz4770_phy, otg);
}
static inline struct jz4770_phy *phy_to_jz4770_phy(struct usb_phy *phy)
{
return container_of(phy, struct jz4770_phy, phy);
}
static int jz4770_phy_set_peripheral(struct usb_otg *otg,
struct usb_gadget *gadget)
{
struct jz4770_phy *priv = otg_to_jz4770_phy(otg);
u32 reg;
reg = readl(priv->base + REG_USBPCR_OFFSET);
reg &= ~USBPCR_USB_MODE;
reg |= USBPCR_VBUSVLDEXT | USBPCR_VBUSVLDEXTSEL | USBPCR_OTG_DISABLE;
writel(reg, priv->base + REG_USBPCR_OFFSET);
return 0;
}
static int jz4770_phy_set_host(struct usb_otg *otg, struct usb_bus *host)
{
struct jz4770_phy *priv = otg_to_jz4770_phy(otg);
u32 reg;
reg = readl(priv->base + REG_USBPCR_OFFSET);
reg &= ~(USBPCR_VBUSVLDEXT | USBPCR_VBUSVLDEXTSEL | USBPCR_OTG_DISABLE);
reg |= USBPCR_USB_MODE;
writel(reg, priv->base + REG_USBPCR_OFFSET);
return 0;
}
static int jz4770_phy_init(struct usb_phy *phy)
{
struct jz4770_phy *priv = phy_to_jz4770_phy(phy);
int err;
u32 reg;
err = regulator_enable(priv->vcc_supply);
if (err) {
dev_err(priv->dev, "Unable to enable VCC: %d\n", err);
return err;
}
err = clk_prepare_enable(priv->clk);
if (err) {
dev_err(priv->dev, "Unable to start clock: %d\n", err);
return err;
}
reg = USBPCR_AVLD_REG | USBPCR_COMMONONN | USBPCR_IDPULLUP_ALWAYS |
(USBPCR_COMPDISTUNE_DFT << USBPCR_COMPDISTUNE_LSB) |
(USBPCR_OTGTUNE_DFT << USBPCR_OTGTUNE_LSB) |
(USBPCR_SQRXTUNE_DFT << USBPCR_SQRXTUNE_LSB) |
(USBPCR_TXFSLSTUNE_DFT << USBPCR_TXFSLSTUNE_LSB) |
(USBPCR_TXRISETUNE_DFT << USBPCR_TXRISETUNE_LSB) |
(USBPCR_TXVREFTUNE_DFT << USBPCR_TXVREFTUNE_LSB) |
USBPCR_POR;
writel(reg, priv->base + REG_USBPCR_OFFSET);
/* Wait for PHY to reset */
usleep_range(30, 300);
writel(reg & ~USBPCR_POR, priv->base + REG_USBPCR_OFFSET);
usleep_range(300, 1000);
return 0;
}
static void jz4770_phy_shutdown(struct usb_phy *phy)
{
struct jz4770_phy *priv = phy_to_jz4770_phy(phy);
clk_disable_unprepare(priv->clk);
regulator_disable(priv->vcc_supply);
}
static void jz4770_phy_remove(void *phy)
{
usb_remove_phy(phy);
}
static int jz4770_phy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct jz4770_phy *priv;
int err;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
priv->dev = dev;
priv->phy.dev = dev;
priv->phy.otg = &priv->otg;
priv->phy.label = "jz4770-phy";
priv->phy.init = jz4770_phy_init;
priv->phy.shutdown = jz4770_phy_shutdown;
priv->otg.state = OTG_STATE_UNDEFINED;
priv->otg.usb_phy = &priv->phy;
priv->otg.set_host = jz4770_phy_set_host;
priv->otg.set_peripheral = jz4770_phy_set_peripheral;
priv->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->base)) {
dev_err(dev, "Failed to map registers\n");
return PTR_ERR(priv->base);
}
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
err = PTR_ERR(priv->clk);
if (err != -EPROBE_DEFER)
dev_err(dev, "Failed to get clock\n");
return err;
}
priv->vcc_supply = devm_regulator_get(dev, "vcc");
if (IS_ERR(priv->vcc_supply)) {
err = PTR_ERR(priv->vcc_supply);
if (err != -EPROBE_DEFER)
dev_err(dev, "Failed to get regulator\n");
return err;
}
err = usb_add_phy(&priv->phy, USB_PHY_TYPE_USB2);
if (err) {
if (err != -EPROBE_DEFER)
dev_err(dev, "Unable to register PHY\n");
return err;
}
return devm_add_action_or_reset(dev, jz4770_phy_remove, &priv->phy);
}
#ifdef CONFIG_OF
static const struct of_device_id jz4770_phy_of_matches[] = {
{ .compatible = "ingenic,jz4770-phy" },
{ }
};
MODULE_DEVICE_TABLE(of, jz4770_phy_of_matches);
#endif
static struct platform_driver jz4770_phy_driver = {
.probe = jz4770_phy_probe,
.driver = {
.name = "jz4770-phy",
.of_match_table = of_match_ptr(jz4770_phy_of_matches),
},
};
module_platform_driver(jz4770_phy_driver);
MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
MODULE_DESCRIPTION("Ingenic JZ4770 USB PHY driver");
MODULE_LICENSE("GPL");
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