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