--- /dev/null
+/**
+ * dwc3-keystone.c - Keystone Specific Glue layer
+ *
+ * Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: WingMan Kwok <w-kwok2@ti.com>
+ *
+ * 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/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+
+/* USBSS register offsets */
+#define USBSS_REVISION 0x0000
+#define USBSS_SYSCONFIG 0x0010
+#define USBSS_IRQ_EOI 0x0018
+#define USBSS_IRQSTATUS_RAW_0 0x0020
+#define USBSS_IRQSTATUS_0 0x0024
+#define USBSS_IRQENABLE_SET_0 0x0028
+#define USBSS_IRQENABLE_CLR_0 0x002c
+
+/* IRQ register bits */
+#define USBSS_IRQ_EOI_LINE(n) BIT(n)
+#define USBSS_IRQ_EVENT_ST BIT(0)
+#define USBSS_IRQ_COREIRQ_EN BIT(0)
+#define USBSS_IRQ_COREIRQ_CLR BIT(0)
+
+static u64 kdwc3_dma_mask;
+
+struct dwc3_keystone {
+ struct device *dev;
+ struct clk *clk;
+ void __iomem *usbss;
+};
+
+static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
+{
+ return readl(base + offset);
+}
+
+static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
+{
+ writel(value, base + offset);
+}
+
+static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
+{
+ u32 val;
+
+ val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
+ val |= USBSS_IRQ_COREIRQ_EN;
+ kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
+}
+
+static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
+{
+ u32 val;
+
+ val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
+ val &= ~USBSS_IRQ_COREIRQ_EN;
+ kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
+}
+
+static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
+{
+ struct dwc3_keystone *kdwc = _kdwc;
+
+ kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
+ kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
+ kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
+ kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));
+
+ return IRQ_HANDLED;
+}
+
+static int kdwc3_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = pdev->dev.of_node;
+ struct dwc3_keystone *kdwc;
+ struct resource *res;
+ int error, irq;
+
+ kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
+ if (!kdwc)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, kdwc);
+
+ 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))
+ return PTR_ERR(kdwc->usbss);
+
+ kdwc3_dma_mask = dma_get_mask(dev);
+ dev->dma_mask = &kdwc3_dma_mask;
+
+ kdwc->clk = devm_clk_get(kdwc->dev, "usb");
+
+ error = clk_prepare_enable(kdwc->clk);
+ if (error < 0) {
+ dev_dbg(kdwc->dev, "unable to enable usb clock, err %d\n",
+ 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,
+ dev_name(dev), kdwc);
+ if (error) {
+ dev_err(dev, "failed to request IRQ #%d --> %d\n",
+ irq, error);
+ goto err_irq;
+ }
+
+ 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:
+ clk_disable_unprepare(kdwc->clk);
+
+ return error;
+}
+
+static int kdwc3_remove_core(struct device *dev, void *c)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ platform_device_unregister(pdev);
+
+ return 0;
+}
+
+static int kdwc3_remove(struct platform_device *pdev)
+{
+ struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
+
+ kdwc3_disable_irqs(kdwc);
+ device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
+ clk_disable_unprepare(kdwc->clk);
+ 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@ti.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
projects / linux-beck.git / commitdiff