1 files changed, 301 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
new file mode 100644
index 000000000000..016352e0f5a7
--- /dev/null
+++ b/drivers/usb/host/ehci-exynos.c
@@ -0,0 +1,301 @@
+/*
+ * SAMSUNG EXYNOS USB HOST EHCI Controller
+ *
+ * Copyright (C) 2011 Samsung Electronics Co.Ltd
+ * Author: Jingoo Han <jg1.han@samsung.com>
+ * Author: Joonyoung Shim <jy0922.shim@samsung.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.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/usb/phy.h>
+#include <linux/usb/samsung_usb_phy.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/otg.h>
+
+#include "ehci.h"
+
+#define DRIVER_DESC "EHCI EXYNOS driver"
+
+#define EHCI_INSNREG00(base)                    (base + 0x90)
+#define EHCI_INSNREG00_ENA_INCR16               (0x1 << 25)
+#define EHCI_INSNREG00_ENA_INCR8                (0x1 << 24)
+#define EHCI_INSNREG00_ENA_INCR4                (0x1 << 23)
+#define EHCI_INSNREG00_ENA_INCRX_ALIGN          (0x1 << 22)
+#define EHCI_INSNREG00_ENABLE_DMA_BURST \
+        (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
+         EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
+
+static const char hcd_name[] = "ehci-exynos";
+static struct hc_driver __read_mostly exynos_ehci_hc_driver;
+
+struct exynos_ehci_hcd {
+        struct clk *clk;
+        struct usb_phy *phy;
+        struct usb_otg *otg;
+};
+
+#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
+
+static void exynos_setup_vbus_gpio(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        int err;
+        int gpio;
+
+        if (!dev->of_node)
+                return;
+
+        gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
+        if (!gpio_is_valid(gpio))
+                return;
+
+        err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
+                                    "ehci_vbus_gpio");
+        if (err)
+                dev_err(dev, "can't request ehci vbus gpio %d", gpio);
+}
+
+static int exynos_ehci_probe(struct platform_device *pdev)
+{
+        struct exynos_ehci_hcd *exynos_ehci;
+        struct usb_hcd *hcd;
+        struct ehci_hcd *ehci;
+        struct resource *res;
+        struct usb_phy *phy;
+        int irq;
+        int err;
+
+        /*
+         * Right now device-tree probed devices don't get dma_mask set.
+         * Since shared usb code relies on it, set it here for now.
+         * Once we move to full device tree support this will vanish off.
+         */
+        if (!pdev->dev.dma_mask)
+                pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+        if (!pdev->dev.coherent_dma_mask)
+                pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
+        exynos_setup_vbus_gpio(pdev);
+
+        hcd = usb_create_hcd(&exynos_ehci_hc_driver,
+                             &pdev->dev, dev_name(&pdev->dev));
+        if (!hcd) {
+                dev_err(&pdev->dev, "Unable to create HCD\n");
+                return -ENOMEM;
+        }
+        exynos_ehci = to_exynos_ehci(hcd);
+
+        if (of_device_is_compatible(pdev->dev.of_node,
+                                        "samsung,exynos5440-ehci"))
+                goto skip_phy;
+
+        phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
+        if (IS_ERR(phy)) {
+                usb_put_hcd(hcd);
+                dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
+                return -EPROBE_DEFER;
+        } else {
+                exynos_ehci->phy = phy;
+                exynos_ehci->otg = phy->otg;
+        }
+
+skip_phy:
+
+        exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
+
+        if (IS_ERR(exynos_ehci->clk)) {
+                dev_err(&pdev->dev, "Failed to get usbhost clock\n");
+                err = PTR_ERR(exynos_ehci->clk);
+                goto fail_clk;
+        }
+
+        err = clk_prepare_enable(exynos_ehci->clk);
+        if (err)
+                goto fail_clk;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "Failed to get I/O memory\n");
+                err = -ENXIO;
+                goto fail_io;
+        }
+
+        hcd->rsrc_start = res->start;
+        hcd->rsrc_len = resource_size(res);
+        hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
+        if (!hcd->regs) {
+                dev_err(&pdev->dev, "Failed to remap I/O memory\n");
+                err = -ENOMEM;
+                goto fail_io;
+        }
+
+        irq = platform_get_irq(pdev, 0);
+        if (!irq) {
+                dev_err(&pdev->dev, "Failed to get IRQ\n");
+                err = -ENODEV;
+                goto fail_io;
+        }
+
+        if (exynos_ehci->otg)
+                exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
+
+        if (exynos_ehci->phy)
+                usb_phy_init(exynos_ehci->phy);
+
+        ehci = hcd_to_ehci(hcd);
+        ehci->caps = hcd->regs;
+
+        /* DMA burst Enable */
+        writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
+
+        err = usb_add_hcd(hcd, irq, IRQF_SHARED);
+        if (err) {
+                dev_err(&pdev->dev, "Failed to add USB HCD\n");
+                goto fail_add_hcd;
+        }
+
+        platform_set_drvdata(pdev, hcd);
+
+        return 0;
+
+fail_add_hcd:
+        if (exynos_ehci->phy)
+                usb_phy_shutdown(exynos_ehci->phy);
+fail_io:
+        clk_disable_unprepare(exynos_ehci->clk);
+fail_clk:
+        usb_put_hcd(hcd);
+        return err;
+}
+
+static int exynos_ehci_remove(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+        struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+
+        usb_remove_hcd(hcd);
+
+        if (exynos_ehci->otg)
+                exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
+
+        if (exynos_ehci->phy)
+                usb_phy_shutdown(exynos_ehci->phy);
+
+        clk_disable_unprepare(exynos_ehci->clk);
+
+        usb_put_hcd(hcd);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int exynos_ehci_suspend(struct device *dev)
+{
+        struct usb_hcd *hcd = dev_get_drvdata(dev);
+        struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+
+        bool do_wakeup = device_may_wakeup(dev);
+        int rc;
+
+        rc = ehci_suspend(hcd, do_wakeup);
+
+        if (exynos_ehci->otg)
+                exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
+
+        if (exynos_ehci->phy)
+                usb_phy_shutdown(exynos_ehci->phy);
+
+        clk_disable_unprepare(exynos_ehci->clk);
+
+        return rc;
+}
+
+static int exynos_ehci_resume(struct device *dev)
+{
+        struct usb_hcd *hcd = dev_get_drvdata(dev);
+        struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+
+        clk_prepare_enable(exynos_ehci->clk);
+
+        if (exynos_ehci->otg)
+                exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
+
+        if (exynos_ehci->phy)
+                usb_phy_init(exynos_ehci->phy);
+
+        /* DMA burst Enable */
+        writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
+
+        ehci_resume(hcd, false);
+        return 0;
+}
+#else
+#define exynos_ehci_suspend     NULL
+#define exynos_ehci_resume      NULL
+#endif
+
+static const struct dev_pm_ops exynos_ehci_pm_ops = {
+        .suspend        = exynos_ehci_suspend,
+        .resume         = exynos_ehci_resume,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id exynos_ehci_match[] = {
+        { .compatible = "samsung,exynos4210-ehci" },
+        { .compatible = "samsung,exynos5440-ehci" },
+        {},
+};
+MODULE_DEVICE_TABLE(of, exynos_ehci_match);
+#endif
+
+static struct platform_driver exynos_ehci_driver = {
+        .probe          = exynos_ehci_probe,
+        .remove         = exynos_ehci_remove,
+        .shutdown       = usb_hcd_platform_shutdown,
+        .driver = {
+                .name   = "exynos-ehci",
+                .owner  = THIS_MODULE,
+                .pm     = &exynos_ehci_pm_ops,
+                .of_match_table = of_match_ptr(exynos_ehci_match),
+        }
+};
+static const struct ehci_driver_overrides exynos_overrides __initdata = {
+        .extra_priv_size = sizeof(struct exynos_ehci_hcd),
+};
+
+static int __init ehci_exynos_init(void)
+{
+        if (usb_disabled())
+                return -ENODEV;
+
+        pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+        ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
+        return platform_driver_register(&exynos_ehci_driver);
+}
+module_init(ehci_exynos_init);
+
+static void __exit ehci_exynos_cleanup(void)
+{
+        platform_driver_unregister(&exynos_ehci_driver);
+}
+module_exit(ehci_exynos_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("platform:exynos-ehci");
+MODULE_AUTHOR("Jingoo Han");
+MODULE_AUTHOR("Joonyoung Shim");
+MODULE_LICENSE("GPL v2");