Add Keystone platform specific glue layer to support USB3 Host mode. Cc: Santosh Shilimkar <santosh.shilimkar@xxxxxx> Cc: Felipe Balbi <balbi@xxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: WingMan Kwok <w-kwok2@xxxxxx> --- drivers/usb/dwc3/Kconfig | 7 + drivers/usb/dwc3/Makefile | 1 + drivers/usb/dwc3/dwc3-keystone.c | 272 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 280 insertions(+) create mode 100644 drivers/usb/dwc3/dwc3-keystone.c diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig index 70fc430..e2c730f 100644 --- a/drivers/usb/dwc3/Kconfig +++ b/drivers/usb/dwc3/Kconfig @@ -70,6 +70,13 @@ config USB_DWC3_PCI One such PCIe-based platform is Synopsys' PCIe HAPS model of this IP. +config USB_DWC3_KEYSTONE + tristate "Texas Instruments Keystone2 Platforms" + default USB_DWC3 + help + Support of USB2/3 functionality in TI Keystone2 platforms. + Say 'Y' or 'M' here if you have one such device + comment "Debugging features" config USB_DWC3_DEBUG diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile index dd17601..10ac3e7 100644 --- a/drivers/usb/dwc3/Makefile +++ b/drivers/usb/dwc3/Makefile @@ -32,3 +32,4 @@ endif obj-$(CONFIG_USB_DWC3_OMAP) += dwc3-omap.o obj-$(CONFIG_USB_DWC3_EXYNOS) += dwc3-exynos.o obj-$(CONFIG_USB_DWC3_PCI) += dwc3-pci.o +obj-$(CONFIG_USB_DWC3_KEYSTONE) += dwc3-keystone.o diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c new file mode 100644 index 0000000..a4c9cbc --- /dev/null +++ b/drivers/usb/dwc3/dwc3-keystone.c @@ -0,0 +1,272 @@ +/** + * dwc3-keystone.c - Keystone Specific Glue layer + * + * Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com + * + * Authors: WingMan Kwok <w-kwok2@xxxxxx> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 of + * the License as published by the Free Software Foundation. + * + * 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/clk.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/ioport.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/usb/usb_phy_gen_xceiv.h> + + +#define BITS(n) (BIT(n) - 1) +#define BITFIELD(x, s, n) (((x) & BITS(n)) << (s)) +#define MASK 0xffffffff +#define PHY_REF_SSP_EN(x) BITFIELD(x, 29, 1) + +static u64 kdwc3_dma_mask; + +struct kdwc3_phy_ctrl_regs { + u32 phy_utmi; + u32 phy_pipe; + u32 phy_param_ctrl_1; + u32 phy_param_ctrl_2; + u32 phy_clock; + u32 phy_pll; +}; + +struct kdwc3_irq_regs { + u32 revision; + u32 _rsvd0[3]; + u32 sysconfig; + u32 _rsvd1[1]; + u32 irq_eoi; + u32 _rsvd2[1]; + struct { + u32 raw_status; + u32 status; + u32 enable_set; + u32 enable_clr; + } irqs[16]; +}; + +struct dwc3_keystone { + spinlock_t lock; + struct device *dev; + struct clk *clk; + int irqn; + + struct kdwc3_phy_ctrl_regs __iomem *phy_ctrl; + struct kdwc3_irq_regs __iomem *usbss; +}; + +static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc) +{ + writel(1, &kdwc->usbss->irqs[kdwc->irqn].enable_set); +} + +static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc) +{ + writel(0, &kdwc->usbss->irqs[kdwc->irqn].enable_set); +} + +static int kdwc3_enable(struct dwc3_keystone *kdwc) +{ + int error; + u32 val; + + kdwc->clk = devm_clk_get(kdwc->dev, "usb"); + if (IS_ERR_OR_NULL(kdwc->clk)) { + dev_err(kdwc->dev, "unable to get kdwc usb clock\n"); + return -ENODEV; + } + + val = readl(&kdwc->phy_ctrl->phy_clock); + writel(val | PHY_REF_SSP_EN(1), &kdwc->phy_ctrl->phy_clock); + udelay(20); + + error = clk_prepare_enable(kdwc->clk); + if (error < 0) { + dev_dbg(kdwc->dev, "unable to enable usb clock, err %d\n", + error); + writel(val, &kdwc->phy_ctrl->phy_clock); + return error; + } + + /* soft reset usbss */ + writel(1, &kdwc->usbss->sysconfig); + while (readl(&kdwc->usbss->sysconfig) & 1) + ; + + val = readl(&kdwc->usbss->revision); + dev_info(kdwc->dev, "usbss revision %x\n", val); + + return 0; +} + +static void kdwc3_disable(struct dwc3_keystone *kdwc) +{ + u32 val; + + clk_disable_unprepare(kdwc->clk); + + val = readl(&kdwc->phy_ctrl->phy_clock); + val &= ~PHY_REF_SSP_EN(MASK); + writel(val, &kdwc->phy_ctrl->phy_clock); +} + +static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc) +{ + struct dwc3_keystone *kdwc = _kdwc; + int irqn = kdwc->irqn; + + spin_lock(&kdwc->lock); + writel(1, &kdwc->usbss->irqs[irqn].enable_clr); + writel(1, &kdwc->usbss->irqs[irqn].status); + writel(1, &kdwc->usbss->irqs[irqn].enable_set); + writel(BIT(irqn), &kdwc->usbss->irq_eoi); + spin_unlock(&kdwc->lock); + + return IRQ_HANDLED; +} + +static int kdwc3_probe(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct device *dev = &pdev->dev; + struct dwc3_keystone *kdwc; + struct resource *res; + int error, irq; + + if (!node) { + dev_err(dev, "device node not found\n"); + return -EINVAL; + } + + kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL); + if (!kdwc) + return -ENOMEM; + + platform_set_drvdata(pdev, kdwc); + + spin_lock_init(&kdwc->lock); + kdwc->dev = dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "missing usbss resource\n"); + return -EINVAL; + } + + kdwc->usbss = devm_ioremap_resource(dev, res); + if (IS_ERR(kdwc->usbss)) { + dev_err(dev, "ioremap failed on usbss region\n"); + return PTR_ERR(kdwc->usbss); + } + + dev_dbg(dev, "usbss control start=%08x size=%d mapped=%08x\n", + (u32)(res->start), (int)resource_size(res), + (u32)(kdwc->usbss)); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) { + dev_err(dev, "missing usb phy resource\n"); + return -EINVAL; + } + + kdwc->phy_ctrl = devm_ioremap_resource(dev, res); + if (IS_ERR(kdwc->phy_ctrl)) { + dev_err(dev, "ioremap failed on usb phy region\n"); + return PTR_ERR(kdwc->phy_ctrl); + } + + dev_dbg(dev, "phy control start=%08x size=%d mapped=%08x\n", + (u32)(res->start), (int)resource_size(res), + (u32)(kdwc->phy_ctrl)); + + kdwc3_dma_mask = dma_get_mask(dev); + dev->dma_mask = &kdwc3_dma_mask; + + error = kdwc3_enable(kdwc); + if (error) + return error; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "missing irq\n"); + goto err_irq; + } + + error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED, + "keystone-dwc3", kdwc); + if (error) { + dev_err(dev, "failed to request IRQ #%d --> %d\n", + irq, error); + goto err_irq; + } + + kdwc->irqn = 0; + + kdwc3_enable_irqs(kdwc); + + error = of_platform_populate(node, NULL, NULL, dev); + if (error) { + dev_err(&pdev->dev, "failed to create dwc3 core\n"); + goto err_core; + } + + return 0; + +err_core: + kdwc3_disable_irqs(kdwc); +err_irq: + kdwc3_disable(kdwc); + + return error; +} + +static int kdwc3_remove(struct platform_device *pdev) +{ + struct dwc3_keystone *kdwc = platform_get_drvdata(pdev); + + if (kdwc) { + kdwc3_disable_irqs(kdwc); + kdwc3_disable(kdwc); + platform_set_drvdata(pdev, NULL); + } + return 0; +} + +static const struct of_device_id kdwc3_of_match[] = { + { .compatible = "ti,keystone-dwc3", }, + {}, +}; +MODULE_DEVICE_TABLE(of, kdwc3_of_match); + +static struct platform_driver kdwc3_driver = { + .probe = kdwc3_probe, + .remove = kdwc3_remove, + .driver = { + .name = "keystone-dwc3", + .owner = THIS_MODULE, + .of_match_table = kdwc3_of_match, + }, +}; + +module_platform_driver(kdwc3_driver); + +MODULE_ALIAS("platform:keystone-dwc3"); +MODULE_AUTHOR("WingMan Kwok <w-kwok2@xxxxxx>"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer"); -- 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
