187 lines
4.3 KiB
C
187 lines
4.3 KiB
C
// 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 - http://www.ti.com
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*
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* Author: WingMan Kwok <w-kwok2@ti.com>
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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/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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};
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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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struct resource *res;
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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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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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kdwc->usbss = devm_ioremap_resource(dev, res);
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if (IS_ERR(kdwc->usbss))
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return PTR_ERR(kdwc->usbss);
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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 = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "missing irq\n");
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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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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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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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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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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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{},
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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 <w-kwok2@ti.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
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