diff options
Diffstat (limited to 'drivers/phy/phy-rcar-gen3-usb2.c')
| -rw-r--r-- | drivers/phy/phy-rcar-gen3-usb2.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/drivers/phy/phy-rcar-gen3-usb2.c b/drivers/phy/phy-rcar-gen3-usb2.c new file mode 100644 index 000000000000..269615228b1b --- /dev/null +++ b/drivers/phy/phy-rcar-gen3-usb2.c @@ -0,0 +1,217 @@ +/* + * Renesas R-Car Gen3 for USB2.0 PHY driver + * + * Copyright (C) 2015 Renesas Electronics Corporation + * + * This is based on the phy-rcar-gen2 driver: + * Copyright (C) 2014 Renesas Solutions Corp. + * Copyright (C) 2014 Cogent Embedded, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.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 + +/* INT_ENABLE */ +#define USB2_INT_ENABLE_USBH_INTB_EN BIT(2) +#define USB2_INT_ENABLE_USBH_INTA_EN BIT(1) +#define USB2_INT_ENABLE_INIT (USB2_INT_ENABLE_USBH_INTB_EN | \ + USB2_INT_ENABLE_USBH_INTA_EN) + +/* USBCTR */ +#define USB2_USBCTR_DIRPD BIT(2) +#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 + +/******* HSUSB registers (original offset is +0x100) *******/ +#define HSUSB_LPSTS 0x02 +#define HSUSB_UGCTRL2 0x84 + +/* Low Power Status register (LPSTS) */ +#define HSUSB_LPSTS_SUSPM 0x4000 + +/* USB General control register 2 (UGCTRL2) */ +#define HSUSB_UGCTRL2_MASK 0x00000031 /* bit[31:6] should be 0 */ +#define HSUSB_UGCTRL2_USB0SEL 0x00000030 +#define HSUSB_UGCTRL2_USB0SEL_HOST 0x00000010 +#define HSUSB_UGCTRL2_USB0SEL_HS_USB 0x00000020 +#define HSUSB_UGCTRL2_USB0SEL_OTG 0x00000030 + +struct rcar_gen3_data { + void __iomem *base; + struct clk *clk; +}; + +struct rcar_gen3_chan { + struct rcar_gen3_data usb2; + struct rcar_gen3_data hsusb; + struct phy *phy; +}; + +static int rcar_gen3_phy_usb2_init(struct phy *p) +{ + struct rcar_gen3_chan *channel = phy_get_drvdata(p); + void __iomem *usb2_base = channel->usb2.base; + void __iomem *hsusb_base = channel->hsusb.base; + u32 val; + + /* Initialize USB2 part */ + writel(USB2_INT_ENABLE_INIT, usb2_base + USB2_INT_ENABLE); + writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET); + writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET); + + /* Initialize HSUSB part */ + if (hsusb_base) { + /* TODO: support "OTG" mode */ + val = readl(hsusb_base + HSUSB_UGCTRL2); + val = (val & ~HSUSB_UGCTRL2_USB0SEL) | + HSUSB_UGCTRL2_USB0SEL_HOST; + writel(val & HSUSB_UGCTRL2_MASK, hsusb_base + HSUSB_UGCTRL2); + } + + return 0; +} + +static int rcar_gen3_phy_usb2_exit(struct phy *p) +{ + struct rcar_gen3_chan *channel = phy_get_drvdata(p); + + writel(0, channel->usb2.base + USB2_INT_ENABLE); + + return 0; +} + +static int rcar_gen3_phy_usb2_power_on(struct phy *p) +{ + struct rcar_gen3_chan *channel = phy_get_drvdata(p); + void __iomem *usb2_base = channel->usb2.base; + void __iomem *hsusb_base = channel->hsusb.base; + u32 val; + + val = readl(usb2_base + USB2_USBCTR); + val |= USB2_USBCTR_PLL_RST; + writel(val, usb2_base + USB2_USBCTR); + val &= ~USB2_USBCTR_PLL_RST; + writel(val, usb2_base + USB2_USBCTR); + + /* + * TODO: To reduce power consuming, this driver should set the SUSPM + * after the PHY detects ID pin as peripheral. + */ + if (hsusb_base) { + /* Power on HSUSB PHY */ + val = readw(hsusb_base + HSUSB_LPSTS); + val |= HSUSB_LPSTS_SUSPM; + writew(val, hsusb_base + HSUSB_LPSTS); + } + + return 0; +} + +static int rcar_gen3_phy_usb2_power_off(struct phy *p) +{ + struct rcar_gen3_chan *channel = phy_get_drvdata(p); + void __iomem *hsusb_base = channel->hsusb.base; + u32 val; + + if (hsusb_base) { + /* Power off HSUSB PHY */ + val = readw(hsusb_base + HSUSB_LPSTS); + val &= ~HSUSB_LPSTS_SUSPM; + writew(val, hsusb_base + HSUSB_LPSTS); + } + + return 0; +} + +static struct phy_ops rcar_gen3_phy_usb2_ops = { + .init = rcar_gen3_phy_usb2_init, + .exit = rcar_gen3_phy_usb2_exit, + .power_on = rcar_gen3_phy_usb2_power_on, + .power_off = rcar_gen3_phy_usb2_power_off, + .owner = THIS_MODULE, +}; + +static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = { + { .compatible = "renesas,usb2-phy-r8a7795" }, + { } +}; +MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table); + +static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rcar_gen3_chan *channel; + struct phy_provider *provider; + struct resource *res; + + if (!dev->of_node) { + dev_err(dev, "This driver needs device tree\n"); + return -EINVAL; + } + + channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL); + if (!channel) + return -ENOMEM; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "usb2_host"); + channel->usb2.base = devm_ioremap_resource(dev, res); + if (IS_ERR(channel->usb2.base)) + return PTR_ERR(channel->usb2.base); + + /* "hsusb" memory resource is optional */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hsusb"); + + /* To avoid error message by devm_ioremap_resource() */ + if (res) { + channel->hsusb.base = devm_ioremap_resource(dev, res); + if (IS_ERR(channel->hsusb.base)) + channel->hsusb.base = NULL; + } + + /* devm_phy_create() will call pm_runtime_enable(dev); */ + channel->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb2_ops); + if (IS_ERR(channel->phy)) { + dev_err(dev, "Failed to create USB2 PHY\n"); + return PTR_ERR(channel->phy); + } + + phy_set_drvdata(channel->phy, channel); + + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(provider)) + dev_err(dev, "Failed to register PHY provider\n"); + + return PTR_ERR_OR_ZERO(provider); +} + +static struct platform_driver rcar_gen3_phy_usb2_driver = { + .driver = { + .name = "phy_rcar_gen3_usb2", + .of_match_table = rcar_gen3_phy_usb2_match_table, + }, + .probe = rcar_gen3_phy_usb2_probe, +}; +module_platform_driver(rcar_gen3_phy_usb2_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY"); +MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>"); |