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226 lines
5.4 KiB
226 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/** |
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* dwc3-keystone.c - Keystone Specific Glue layer |
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* |
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* Copyright (C) 2010-2013 Texas Instruments Incorporated - https://www.ti.com |
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* |
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* Author: WingMan Kwok <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/io.h> |
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#include <linux/of_platform.h> |
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#include <linux/phy/phy.h> |
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#include <linux/pm_runtime.h> |
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/* USBSS register offsets */ |
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#define USBSS_REVISION 0x0000 |
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#define USBSS_SYSCONFIG 0x0010 |
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#define USBSS_IRQ_EOI 0x0018 |
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#define USBSS_IRQSTATUS_RAW_0 0x0020 |
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#define USBSS_IRQSTATUS_0 0x0024 |
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#define USBSS_IRQENABLE_SET_0 0x0028 |
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#define USBSS_IRQENABLE_CLR_0 0x002c |
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/* IRQ register bits */ |
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#define USBSS_IRQ_EOI_LINE(n) BIT(n) |
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#define USBSS_IRQ_EVENT_ST BIT(0) |
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#define USBSS_IRQ_COREIRQ_EN BIT(0) |
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#define USBSS_IRQ_COREIRQ_CLR BIT(0) |
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struct dwc3_keystone { |
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struct device *dev; |
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void __iomem *usbss; |
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struct phy *usb3_phy; |
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}; |
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static inline u32 kdwc3_readl(void __iomem *base, u32 offset) |
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{ |
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return readl(base + offset); |
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} |
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static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value) |
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{ |
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writel(value, base + offset); |
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} |
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static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc) |
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{ |
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u32 val; |
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val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0); |
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val |= USBSS_IRQ_COREIRQ_EN; |
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kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val); |
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} |
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static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc) |
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{ |
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u32 val; |
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val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0); |
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val &= ~USBSS_IRQ_COREIRQ_EN; |
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kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val); |
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} |
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static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc) |
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{ |
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struct dwc3_keystone *kdwc = _kdwc; |
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kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR); |
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kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST); |
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kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN); |
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kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0)); |
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return IRQ_HANDLED; |
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} |
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static int kdwc3_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct device_node *node = pdev->dev.of_node; |
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struct dwc3_keystone *kdwc; |
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int error, irq; |
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kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL); |
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if (!kdwc) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, kdwc); |
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kdwc->dev = dev; |
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kdwc->usbss = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(kdwc->usbss)) |
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return PTR_ERR(kdwc->usbss); |
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/* PSC dependency on AM65 needs SERDES0 to be powered before USB0 */ |
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kdwc->usb3_phy = devm_phy_optional_get(dev, "usb3-phy"); |
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if (IS_ERR(kdwc->usb3_phy)) |
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return dev_err_probe(dev, PTR_ERR(kdwc->usb3_phy), "couldn't get usb3 phy\n"); |
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phy_pm_runtime_get_sync(kdwc->usb3_phy); |
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error = phy_reset(kdwc->usb3_phy); |
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if (error < 0) { |
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dev_err(dev, "usb3 phy reset failed: %d\n", error); |
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return error; |
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} |
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error = phy_init(kdwc->usb3_phy); |
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if (error < 0) { |
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dev_err(dev, "usb3 phy init failed: %d\n", error); |
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return error; |
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} |
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error = phy_power_on(kdwc->usb3_phy); |
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if (error < 0) { |
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dev_err(dev, "usb3 phy power on failed: %d\n", error); |
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phy_exit(kdwc->usb3_phy); |
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return error; |
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} |
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pm_runtime_enable(kdwc->dev); |
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error = pm_runtime_get_sync(kdwc->dev); |
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if (error < 0) { |
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dev_err(kdwc->dev, "pm_runtime_get_sync failed, error %d\n", |
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error); |
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goto err_irq; |
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} |
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/* IRQ processing not required currently for AM65 */ |
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if (of_device_is_compatible(node, "ti,am654-dwc3")) |
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goto skip_irq; |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) { |
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error = irq; |
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goto err_irq; |
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} |
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error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED, |
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dev_name(dev), kdwc); |
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if (error) { |
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dev_err(dev, "failed to request IRQ #%d --> %d\n", |
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irq, error); |
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goto err_irq; |
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} |
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kdwc3_enable_irqs(kdwc); |
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skip_irq: |
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error = of_platform_populate(node, NULL, NULL, dev); |
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if (error) { |
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dev_err(&pdev->dev, "failed to create dwc3 core\n"); |
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goto err_core; |
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} |
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return 0; |
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err_core: |
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kdwc3_disable_irqs(kdwc); |
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err_irq: |
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pm_runtime_put_sync(kdwc->dev); |
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pm_runtime_disable(kdwc->dev); |
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phy_power_off(kdwc->usb3_phy); |
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phy_exit(kdwc->usb3_phy); |
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phy_pm_runtime_put_sync(kdwc->usb3_phy); |
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return error; |
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} |
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static int kdwc3_remove_core(struct device *dev, void *c) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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platform_device_unregister(pdev); |
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return 0; |
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} |
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static int kdwc3_remove(struct platform_device *pdev) |
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{ |
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struct dwc3_keystone *kdwc = platform_get_drvdata(pdev); |
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struct device_node *node = pdev->dev.of_node; |
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if (!of_device_is_compatible(node, "ti,am654-dwc3")) |
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kdwc3_disable_irqs(kdwc); |
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device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core); |
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pm_runtime_put_sync(kdwc->dev); |
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pm_runtime_disable(kdwc->dev); |
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phy_power_off(kdwc->usb3_phy); |
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phy_exit(kdwc->usb3_phy); |
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phy_pm_runtime_put_sync(kdwc->usb3_phy); |
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platform_set_drvdata(pdev, NULL); |
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return 0; |
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} |
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static const struct of_device_id kdwc3_of_match[] = { |
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{ .compatible = "ti,keystone-dwc3", }, |
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{ .compatible = "ti,am654-dwc3" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, kdwc3_of_match); |
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static struct platform_driver kdwc3_driver = { |
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.probe = kdwc3_probe, |
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.remove = kdwc3_remove, |
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.driver = { |
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.name = "keystone-dwc3", |
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.of_match_table = kdwc3_of_match, |
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}, |
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}; |
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module_platform_driver(kdwc3_driver); |
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MODULE_ALIAS("platform:keystone-dwc3"); |
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MODULE_AUTHOR("WingMan Kwok <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
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