Add Keystone platform USB PHY driver support. Current main purpose of this driver is to enable the PHY reference clock gate on the Keystone SoC. Otherwise it is a nop PHY. Cc: Santosh Shilimkar <santosh.shilimkar@xxxxxx> Cc: Felipe Balbi <balbi@xxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Acked-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx> Signed-off-by: WingMan Kwok <w-kwok2@xxxxxx> --- drivers/usb/phy/Kconfig | 10 +++ drivers/usb/phy/Makefile | 1 + drivers/usb/phy/phy-keystone.c | 142 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 153 insertions(+) create mode 100644 drivers/usb/phy/phy-keystone.c diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig index 08e2f39..c6792f43 100644 --- a/drivers/usb/phy/Kconfig +++ b/drivers/usb/phy/Kconfig @@ -40,6 +40,16 @@ config ISP1301_OMAP This driver can also be built as a module. If so, the module will be called isp1301_omap. +config KEYSTONE_USB_PHY + tristate "Keystone USB PHY Driver" + depends on ARCH_KEYSTONE + select USB_PHY + select NOP_USB_XCEIV + help + Enable this to support Keystone USB phy. This driver provides + interface to interact with USB 2.0 and USB 3.0 PHY that is part + of the Keystone SOC. + config MV_U3D_PHY bool "Marvell USB 3.0 PHY controller Driver" depends on CPU_MMP3 diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile index 022c1da..311b47b 100644 --- a/drivers/usb/phy/Makefile +++ b/drivers/usb/phy/Makefile @@ -30,3 +30,4 @@ 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 +obj-$(CONFIG_KEYSTONE_USB_PHY) += phy-keystone.o diff --git a/drivers/usb/phy/phy-keystone.c b/drivers/usb/phy/phy-keystone.c new file mode 100644 index 0000000..e025eb2 --- /dev/null +++ b/drivers/usb/phy/phy-keystone.c @@ -0,0 +1,142 @@ +/* + * phy-keystone - USB PHY, talking to dwc3 controller in Keystone. + * + * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Author: WingMan Kwok <w-kwok2@xxxxxx> + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/usb/usb_phy_gen_xceiv.h> +#include <linux/io.h> +#include <linux/of.h> + +#include "phy-generic.h" + +/* USB PHY control register offsets */ +#define USB_PHY_CTL_UTMI 0x0000 +#define USB_PHY_CTL_PIPE 0x0004 +#define USB_PHY_CTL_PARAM_1 0x0008 +#define USB_PHY_CTL_PARAM_2 0x000c +#define USB_PHY_CTL_CLOCK 0x0010 +#define USB_PHY_CTL_PLL 0x0014 + +#define PHY_REF_SSP_EN BIT(29) + +struct keystone_usbphy { + struct usb_phy_gen_xceiv usb_phy_gen; + void __iomem *phy_ctrl; +}; + +static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset) +{ + return readl(base + offset); +} + +static inline void keystone_usbphy_writel(void __iomem *base, + u32 offset, u32 value) +{ + writel(value, base + offset); +} + +static int keystone_usbphy_init(struct usb_phy *phy) +{ + struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev); + u32 val; + + val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK); + keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK, + val | PHY_REF_SSP_EN); + udelay(20); + return 0; +} + +static void keystone_usbphy_shutdown(struct usb_phy *phy) +{ + struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev); + u32 val; + + val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK); + keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK, + val &= ~PHY_REF_SSP_EN); +} + +static int keystone_usbphy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct keystone_usbphy *k_phy; + struct resource *res; + int ret; + + k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL); + if (!k_phy) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "missing usb phy resource\n"); + return -EINVAL; + } + + k_phy->phy_ctrl = devm_ioremap_resource(dev, res); + if (IS_ERR(k_phy->phy_ctrl)) + return PTR_ERR(k_phy->phy_ctrl); + + ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen, + USB_PHY_TYPE_USB2, 0, false); + if (ret) + return ret; + + ret = usb_add_phy_dev(&k_phy->usb_phy_gen.phy); + if (ret) + return ret; + k_phy->usb_phy_gen.phy.init = keystone_usbphy_init; + k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown; + + platform_set_drvdata(pdev, k_phy); + + return 0; +} + +static int keystone_usbphy_remove(struct platform_device *pdev) +{ + struct keystone_usbphy *k_phy = platform_get_drvdata(pdev); + + usb_remove_phy(&k_phy->usb_phy_gen.phy); + + return 0; +} + +static const struct of_device_id keystone_usbphy_ids[] = { + { .compatible = "ti,keystone-usbphy" }, + { } +}; +MODULE_DEVICE_TABLE(of, keystone_usbphy_ids); + +static struct platform_driver keystone_usbphy_driver = { + .probe = keystone_usbphy_probe, + .remove = keystone_usbphy_remove, + .driver = { + .name = "keystone-usbphy", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(keystone_usbphy_ids), + }, +}; + +module_platform_driver(keystone_usbphy_driver); + +MODULE_ALIAS("platform: keystone-usbphy"); +MODULE_AUTHOR("Texas Instruments Inc."); +MODULE_DESCRIPTION("Keystone USB phy driver"); +MODULE_LICENSE("GPL v2"); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
