4 files changed, 286 insertions, 0 deletions

diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 791f11bed606..75823a1abeb6 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -48,6 +48,7 @@ config USB_ARCH_HAS_OHCI
         default y if ARCH_DAVINCI_DA8XX
         default y if ARCH_CNS3XXX
         default y if PLAT_SPEAR
+        default y if ARCH_EXYNOS
         # PPC:
         default y if STB03xxx
         default y if PPC_MPC52xx
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 060e0e2b1ae6..eea85dc16826 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -371,6 +371,12 @@ config USB_OHCI_SH
           Enables support for the on-chip OHCI controller on the SuperH.
           If you use the PCI OHCI controller, this option is not necessary.
 
+config USB_OHCI_EXYNOS
+        boolean "OHCI support for Samsung EXYNOS SoC Series"
+        depends on USB_OHCI_HCD && ARCH_EXYNOS
+        help
+         Enable support for the Samsung Exynos SOC's on-chip OHCI controller.
+
 config USB_CNS3XXX_OHCI
         bool "Cavium CNS3XXX OHCI Module"
         depends on USB_OHCI_HCD && ARCH_CNS3XXX
diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
new file mode 100644
index 000000000000..55aa35aa3d7b
--- /dev/null
+++ b/drivers/usb/host/ohci-exynos.c
@@ -0,0 +1,274 @@
+/*
+ * SAMSUNG EXYNOS USB HOST OHCI Controller
+ *
+ * Copyright (C) 2011 Samsung Electronics Co.Ltd
+ * Author: Jingoo Han <jg1.han@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/platform_device.h>
+#include <mach/ohci.h>
+#include <plat/usb-phy.h>
+
+struct exynos_ohci_hcd {
+        struct device *dev;
+        struct usb_hcd *hcd;
+        struct clk *clk;
+};
+
+static int ohci_exynos_start(struct usb_hcd *hcd)
+{
+        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+        int ret;
+
+        ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
+
+        ret = ohci_init(ohci);
+        if (ret < 0)
+                return ret;
+
+        ret = ohci_run(ohci);
+        if (ret < 0) {
+                err("can't start %s", hcd->self.bus_name);
+                ohci_stop(hcd);
+                return ret;
+        }
+
+        return 0;
+}
+
+static const struct hc_driver exynos_ohci_hc_driver = {
+        .description            = hcd_name,
+        .product_desc           = "EXYNOS OHCI Host Controller",
+        .hcd_priv_size          = sizeof(struct ohci_hcd),
+
+        .irq                    = ohci_irq,
+        .flags                  = HCD_MEMORY|HCD_USB11,
+
+        .start                  = ohci_exynos_start,
+        .stop                   = ohci_stop,
+        .shutdown               = ohci_shutdown,
+
+        .get_frame_number       = ohci_get_frame,
+
+        .urb_enqueue            = ohci_urb_enqueue,
+        .urb_dequeue            = ohci_urb_dequeue,
+        .endpoint_disable       = ohci_endpoint_disable,
+
+        .hub_status_data        = ohci_hub_status_data,
+        .hub_control            = ohci_hub_control,
+#ifdef  CONFIG_PM
+        .bus_suspend            = ohci_bus_suspend,
+        .bus_resume             = ohci_bus_resume,
+#endif
+        .start_port_reset       = ohci_start_port_reset,
+};
+
+static int __devinit exynos_ohci_probe(struct platform_device *pdev)
+{
+        struct exynos4_ohci_platdata *pdata;
+        struct exynos_ohci_hcd *exynos_ohci;
+        struct usb_hcd *hcd;
+        struct ohci_hcd *ohci;
+        struct resource *res;
+        int irq;
+        int err;
+
+        pdata = pdev->dev.platform_data;
+        if (!pdata) {
+                dev_err(&pdev->dev, "No platform data defined\n");
+                return -EINVAL;
+        }
+
+        exynos_ohci = kzalloc(sizeof(struct exynos_ohci_hcd), GFP_KERNEL);
+        if (!exynos_ohci)
+                return -ENOMEM;
+
+        exynos_ohci->dev = &pdev->dev;
+
+        hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
+                                        dev_name(&pdev->dev));
+        if (!hcd) {
+                dev_err(&pdev->dev, "Unable to create HCD\n");
+                err = -ENOMEM;
+                goto fail_hcd;
+        }
+
+        exynos_ohci->hcd = hcd;
+        exynos_ohci->clk = clk_get(&pdev->dev, "usbhost");
+
+        if (IS_ERR(exynos_ohci->clk)) {
+                dev_err(&pdev->dev, "Failed to get usbhost clock\n");
+                err = PTR_ERR(exynos_ohci->clk);
+                goto fail_clk;
+        }
+
+        err = clk_enable(exynos_ohci->clk);
+        if (err)
+                goto fail_clken;
+
+        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 = ioremap(res->start, resource_size(res));
+        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;
+        }
+
+        if (pdata->phy_init)
+                pdata->phy_init(pdev, S5P_USB_PHY_HOST);
+
+        ohci = hcd_to_ohci(hcd);
+        ohci_hcd_init(ohci);
+
+        err = usb_add_hcd(hcd, irq, IRQF_SHARED);
+        if (err) {
+                dev_err(&pdev->dev, "Failed to add USB HCD\n");
+                goto fail;
+        }
+
+        platform_set_drvdata(pdev, exynos_ohci);
+
+        return 0;
+
+fail:
+        iounmap(hcd->regs);
+fail_io:
+        clk_disable(exynos_ohci->clk);
+fail_clken:
+        clk_put(exynos_ohci->clk);
+fail_clk:
+        usb_put_hcd(hcd);
+fail_hcd:
+        kfree(exynos_ohci);
+        return err;
+}
+
+static int __devexit exynos_ohci_remove(struct platform_device *pdev)
+{
+        struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
+        struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
+        struct usb_hcd *hcd = exynos_ohci->hcd;
+
+        usb_remove_hcd(hcd);
+
+        if (pdata && pdata->phy_exit)
+                pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
+
+        iounmap(hcd->regs);
+
+        clk_disable(exynos_ohci->clk);
+        clk_put(exynos_ohci->clk);
+
+        usb_put_hcd(hcd);
+        kfree(exynos_ohci);
+
+        return 0;
+}
+
+static void exynos_ohci_shutdown(struct platform_device *pdev)
+{
+        struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
+        struct usb_hcd *hcd = exynos_ohci->hcd;
+
+        if (hcd->driver->shutdown)
+                hcd->driver->shutdown(hcd);
+}
+
+#ifdef CONFIG_PM
+static int exynos_ohci_suspend(struct device *dev)
+{
+        struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
+        struct usb_hcd *hcd = exynos_ohci->hcd;
+        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+        struct platform_device *pdev = to_platform_device(dev);
+        struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
+        unsigned long flags;
+        int rc = 0;
+
+        /*
+         * Root hub was already suspended. Disable irq emission and
+         * mark HW unaccessible, bail out if RH has been resumed. Use
+         * the spinlock to properly synchronize with possible pending
+         * RH suspend or resume activity.
+         *
+         * This is still racy as hcd->state is manipulated outside of
+         * any locks =P But that will be a different fix.
+         */
+        spin_lock_irqsave(&ohci->lock, flags);
+        if (hcd->state != HC_STATE_SUSPENDED && hcd->state != HC_STATE_HALT) {
+                rc = -EINVAL;
+                goto fail;
+        }
+
+        clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+        if (pdata && pdata->phy_exit)
+                pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
+fail:
+        spin_unlock_irqrestore(&ohci->lock, flags);
+
+        return rc;
+}
+
+static int exynos_ohci_resume(struct device *dev)
+{
+        struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
+        struct usb_hcd *hcd = exynos_ohci->hcd;
+        struct platform_device *pdev = to_platform_device(dev);
+        struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
+
+        if (pdata && pdata->phy_init)
+                pdata->phy_init(pdev, S5P_USB_PHY_HOST);
+
+        /* Mark hardware accessible again as we are out of D3 state by now */
+        set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+        ohci_finish_controller_resume(hcd);
+
+        return 0;
+}
+#else
+#define exynos_ohci_suspend     NULL
+#define exynos_ohci_resume      NULL
+#endif
+
+static const struct dev_pm_ops exynos_ohci_pm_ops = {
+        .suspend        = exynos_ohci_suspend,
+        .resume         = exynos_ohci_resume,
+};
+
+static struct platform_driver exynos_ohci_driver = {
+        .probe          = exynos_ohci_probe,
+        .remove         = __devexit_p(exynos_ohci_remove),
+        .shutdown       = exynos_ohci_shutdown,
+        .driver = {
+                .name   = "exynos-ohci",
+                .owner  = THIS_MODULE,
+                .pm     = &exynos_ohci_pm_ops,
+        }
+};
+
+MODULE_ALIAS("platform:exynos-ohci");
+MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index b2639191549e..a1006ff79384 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1005,6 +1005,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER         ohci_hcd_s3c2410_driver
 #endif
 
+#ifdef CONFIG_USB_OHCI_EXYNOS
+#include "ohci-exynos.c"
+#define PLATFORM_DRIVER         exynos_ohci_driver
+#endif
+
 #ifdef CONFIG_USB_OHCI_HCD_OMAP1
 #include "ohci-omap.c"
 #define OMAP1_PLATFORM_DRIVER   ohci_hcd_omap_driver