From: Valentine Barshak Date: Thu, 10 Oct 2013 16:35:17 +0000 (+0400) Subject: usb: phy: Add RCAR Gen2 USB phy X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5578b266e9ae05391d53b446acf23818256ff13f;p=linux-beck.git usb: phy: Add RCAR Gen2 USB phy This adds RCAR Gen2 USB phy support. The driver configures USB channels 0/2 which are shared between PCI USB hosts and USBHS/USBSS devices. It also controls internal USBHS phy. Signed-off-by: Valentine Barshak Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig index d5589f9c60a9..c0c8cd37648e 100644 --- a/drivers/usb/phy/Kconfig +++ b/drivers/usb/phy/Kconfig @@ -214,6 +214,19 @@ config USB_RCAR_PHY To compile this driver as a module, choose M here: the module will be called phy-rcar-usb. +config USB_RCAR_GEN2_PHY + tristate "Renesas R-Car Gen2 USB PHY support" + depends on ARCH_R8A7790 || ARCH_R8A7791 || COMPILE_TEST + select USB_PHY + help + Say Y here to add support for the Renesas R-Car Gen2 USB PHY driver. + It is typically used to control internal USB PHY for USBHS, + and to configure shared USB channels 0 and 2. + This driver supports R8A7790 and R8A7791. + + To compile this driver as a module, choose M here: the + module will be called phy-rcar-gen2-usb. + config USB_ULPI bool "Generic ULPI Transceiver Driver" depends on ARM diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile index 2135e85f46ed..8c5b14764b72 100644 --- a/drivers/usb/phy/Makefile +++ b/drivers/usb/phy/Makefile @@ -29,5 +29,6 @@ obj-$(CONFIG_USB_MSM_OTG) += phy-msm-usb.o obj-$(CONFIG_USB_MV_OTG) += phy-mv-usb.o obj-$(CONFIG_USB_MXS_PHY) += phy-mxs-usb.o obj-$(CONFIG_USB_RCAR_PHY) += phy-rcar-usb.o +obj-$(CONFIG_USB_RCAR_GEN2_PHY) += phy-rcar-gen2-usb.o obj-$(CONFIG_USB_ULPI) += phy-ulpi.o obj-$(CONFIG_USB_ULPI_VIEWPORT) += phy-ulpi-viewport.o diff --git a/drivers/usb/phy/phy-rcar-gen2-usb.c b/drivers/usb/phy/phy-rcar-gen2-usb.c new file mode 100644 index 000000000000..a99a6953f11c --- /dev/null +++ b/drivers/usb/phy/phy-rcar-gen2-usb.c @@ -0,0 +1,248 @@ +/* + * Renesas R-Car Gen2 USB phy driver + * + * Copyright (C) 2013 Renesas Solutions Corp. + * Copyright (C) 2013 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 +#include +#include +#include +#include +#include +#include +#include + +struct rcar_gen2_usb_phy_priv { + struct usb_phy phy; + void __iomem *base; + struct clk *clk; + spinlock_t lock; + int usecount; + u32 ugctrl2; +}; + +#define usb_phy_to_priv(p) container_of(p, struct rcar_gen2_usb_phy_priv, phy) + +/* Low Power Status register */ +#define USBHS_LPSTS_REG 0x02 +#define USBHS_LPSTS_SUSPM (1 << 14) + +/* USB General control register */ +#define USBHS_UGCTRL_REG 0x80 +#define USBHS_UGCTRL_CONNECT (1 << 2) +#define USBHS_UGCTRL_PLLRESET (1 << 0) + +/* USB General control register 2 */ +#define USBHS_UGCTRL2_REG 0x84 +#define USBHS_UGCTRL2_USB0_PCI (1 << 4) +#define USBHS_UGCTRL2_USB0_HS (3 << 4) +#define USBHS_UGCTRL2_USB2_PCI (0 << 31) +#define USBHS_UGCTRL2_USB2_SS (1 << 31) + +/* USB General status register */ +#define USBHS_UGSTS_REG 0x88 +#define USBHS_UGSTS_LOCK (3 << 8) + +/* Enable USBHS internal phy */ +static int __rcar_gen2_usbhs_phy_enable(void __iomem *base) +{ + u32 val; + int i; + + /* USBHS PHY power on */ + val = ioread32(base + USBHS_UGCTRL_REG); + val &= ~USBHS_UGCTRL_PLLRESET; + iowrite32(val, base + USBHS_UGCTRL_REG); + + val = ioread16(base + USBHS_LPSTS_REG); + val |= USBHS_LPSTS_SUSPM; + iowrite16(val, base + USBHS_LPSTS_REG); + + for (i = 0; i < 20; i++) { + val = ioread32(base + USBHS_UGSTS_REG); + if ((val & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) { + val = ioread32(base + USBHS_UGCTRL_REG); + val |= USBHS_UGCTRL_CONNECT; + iowrite32(val, base + USBHS_UGCTRL_REG); + return 0; + } + udelay(1); + } + + /* Timed out waiting for the PLL lock */ + return -ETIMEDOUT; +} + +/* Disable USBHS internal phy */ +static int __rcar_gen2_usbhs_phy_disable(void __iomem *base) +{ + u32 val; + + /* USBHS PHY power off */ + val = ioread32(base + USBHS_UGCTRL_REG); + val &= ~USBHS_UGCTRL_CONNECT; + iowrite32(val, base + USBHS_UGCTRL_REG); + + val = ioread16(base + USBHS_LPSTS_REG); + val &= ~USBHS_LPSTS_SUSPM; + iowrite16(val, base + USBHS_LPSTS_REG); + + val = ioread32(base + USBHS_UGCTRL_REG); + val |= USBHS_UGCTRL_PLLRESET; + iowrite32(val, base + USBHS_UGCTRL_REG); + return 0; +} + +/* Setup USB channels */ +static void __rcar_gen2_usb_phy_init(struct rcar_gen2_usb_phy_priv *priv) +{ + u32 val; + + clk_prepare_enable(priv->clk); + + /* Set USB channels in the USBHS UGCTRL2 register */ + val = ioread32(priv->base); + val &= ~(USBHS_UGCTRL2_USB0_HS | USBHS_UGCTRL2_USB2_SS); + val |= priv->ugctrl2; + iowrite32(val, priv->base); +} + +/* Shutdown USB channels */ +static void __rcar_gen2_usb_phy_shutdown(struct rcar_gen2_usb_phy_priv *priv) +{ + __rcar_gen2_usbhs_phy_disable(priv->base); + clk_disable_unprepare(priv->clk); +} + +static int rcar_gen2_usb_phy_set_suspend(struct usb_phy *phy, int suspend) +{ + struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy); + unsigned long flags; + int retval; + + spin_lock_irqsave(&priv->lock, flags); + retval = suspend ? __rcar_gen2_usbhs_phy_disable(priv->base) : + __rcar_gen2_usbhs_phy_enable(priv->base); + spin_unlock_irqrestore(&priv->lock, flags); + return retval; +} + +static int rcar_gen2_usb_phy_init(struct usb_phy *phy) +{ + struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy); + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + /* + * Enable the clock and setup USB channels + * if it's the first user + */ + if (!priv->usecount++) + __rcar_gen2_usb_phy_init(priv); + spin_unlock_irqrestore(&priv->lock, flags); + return 0; +} + +static void rcar_gen2_usb_phy_shutdown(struct usb_phy *phy) +{ + struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy); + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + if (!priv->usecount) { + dev_warn(phy->dev, "Trying to disable phy with 0 usecount\n"); + goto out; + } + + /* Disable everything if it's the last user */ + if (!--priv->usecount) + __rcar_gen2_usb_phy_shutdown(priv); +out: + spin_unlock_irqrestore(&priv->lock, flags); +} + +static int rcar_gen2_usb_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rcar_gen2_phy_platform_data *pdata; + struct rcar_gen2_usb_phy_priv *priv; + struct resource *res; + void __iomem *base; + struct clk *clk; + int retval; + + pdata = dev_get_platdata(&pdev->dev); + if (!pdata) { + dev_err(dev, "No platform data\n"); + return -EINVAL; + } + + clk = devm_clk_get(&pdev->dev, "usbhs"); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "Can't get the clock\n"); + return PTR_ERR(clk); + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) { + dev_err(dev, "Memory allocation failed\n"); + return -ENOMEM; + } + + spin_lock_init(&priv->lock); + priv->clk = clk; + priv->base = base; + priv->ugctrl2 = pdata->chan0_pci ? + USBHS_UGCTRL2_USB0_PCI : USBHS_UGCTRL2_USB0_HS; + priv->ugctrl2 |= pdata->chan2_pci ? + USBHS_UGCTRL2_USB2_PCI : USBHS_UGCTRL2_USB2_SS; + priv->phy.dev = dev; + priv->phy.label = dev_name(dev); + priv->phy.init = rcar_gen2_usb_phy_init; + priv->phy.shutdown = rcar_gen2_usb_phy_shutdown; + priv->phy.set_suspend = rcar_gen2_usb_phy_set_suspend; + + retval = usb_add_phy(&priv->phy, USB_PHY_TYPE_USB2); + if (retval < 0) { + dev_err(dev, "Failed to add USB phy\n"); + return retval; + } + + platform_set_drvdata(pdev, priv); + + return retval; +} + +static int rcar_gen2_usb_phy_remove(struct platform_device *pdev) +{ + struct rcar_gen2_usb_phy_priv *priv = platform_get_drvdata(pdev); + + usb_remove_phy(&priv->phy); + + return 0; +} + +static struct platform_driver rcar_gen2_usb_phy_driver = { + .driver = { + .name = "usb_phy_rcar_gen2", + }, + .probe = rcar_gen2_usb_phy_probe, + .remove = rcar_gen2_usb_phy_remove, +}; + +module_platform_driver(rcar_gen2_usb_phy_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Renesas R-Car Gen2 USB phy"); +MODULE_AUTHOR("Valentine Barshak "); diff --git a/include/linux/platform_data/usb-rcar-gen2-phy.h b/include/linux/platform_data/usb-rcar-gen2-phy.h new file mode 100644 index 000000000000..dd3ba46c0d90 --- /dev/null +++ b/include/linux/platform_data/usb-rcar-gen2-phy.h @@ -0,0 +1,22 @@ +/* + * Copyright (C) 2013 Renesas Solutions Corp. + * Copyright (C) 2013 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. + */ + +#ifndef __USB_RCAR_GEN2_PHY_H +#define __USB_RCAR_GEN2_PHY_H + +#include + +struct rcar_gen2_phy_platform_data { + /* USB channel 0 configuration */ + bool chan0_pci:1; /* true: PCI USB host 0, false: USBHS */ + /* USB channel 2 configuration */ + bool chan2_pci:1; /* true: PCI USB host 2, false: USBSS */ +}; + +#endif