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/*
 * MCS814X EHCI Host Controller Driver
 *
 * Based on "ehci-fsl.c" by Randy Vinson <rvinson@mvista.com>
 *
 * 2007 (c) MontaVista Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#include <linux/platform_device.h>
#include <linux/of.h>

#define MCS814X_EHCI_CAPS_OFFSET        0x68

static int mcs814x_ehci_init(struct usb_hcd *hcd)
{
        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
        int retval = 0;

        ehci->caps = hcd->regs + MCS814X_EHCI_CAPS_OFFSET;
        ehci->regs = hcd->regs
                + HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
        ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
        ehci_reset(ehci);

        retval = ehci_init(hcd);
        if (retval) {
                pr_err("ehci_init failed\n");
                return retval;
        }

        return retval;
}

static const struct hc_driver mcs814x_ehci_hc_driver = {
        .description            = hcd_name,
        .product_desc           = "MCS814X EHCI Host Controller",
        .hcd_priv_size          = sizeof(struct ehci_hcd),
        .irq                    = ehci_irq,
        .flags                  = HCD_MEMORY | HCD_USB2,
        .reset                  = mcs814x_ehci_init,
        .start                  = ehci_run,
        .stop                   = ehci_stop,
        .shutdown               = ehci_shutdown,
        .urb_enqueue            = ehci_urb_enqueue,
        .urb_dequeue            = ehci_urb_dequeue,
        .endpoint_disable       = ehci_endpoint_disable,
        .get_frame_number       = ehci_get_frame,
        .hub_status_data        = ehci_hub_status_data,
        .hub_control            = ehci_hub_control,
#if defined(CONFIG_PM)
        .bus_suspend            = ehci_bus_suspend,
        .bus_resume             = ehci_bus_resume,
#endif
        .relinquish_port        = ehci_relinquish_port,
        .port_handed_over       = ehci_port_handed_over,

        .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
};

static int mcs814x_ehci_probe(struct platform_device *pdev)
{
        struct usb_hcd *hcd;
        const struct hc_driver *driver = &mcs814x_ehci_hc_driver;
        struct resource *res;
        int irq;
        int retval;

        if (usb_disabled())
                return -ENODEV;

        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
        if (!res) {
                dev_err(&pdev->dev,
                        "Found HC with no IRQ. Check %s setup!\n",
                        dev_name(&pdev->dev));
                return -ENODEV;
        }
        irq = res->start;

        pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
        pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;

        hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
        if (!hcd) {
                retval = -ENOMEM;
                goto fail_create_hcd;
        }

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res) {
                dev_err(&pdev->dev,
                        "Found HC with no register addr. Check %s setup!\n",
                        dev_name(&pdev->dev));
                retval = -ENODEV;
                goto fail_request_resource;
        }
        hcd->rsrc_start = res->start;
        hcd->rsrc_len = resource_size(res);

        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
                                driver->description)) {
                dev_dbg(&pdev->dev, "controller already in use\n");
                retval = -EBUSY;
                goto fail_request_resource;
        }

        hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
        if (hcd->regs == NULL) {
                dev_dbg(&pdev->dev, "error mapping memory\n");
                retval = -EFAULT;
                goto fail_ioremap;
        }

        retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
        if (retval)
                goto fail_add_hcd;

        dev_info(&pdev->dev, "added MCS814X EHCI driver\n");

        return retval;

fail_add_hcd:
        iounmap(hcd->regs);
fail_ioremap:
        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
fail_request_resource:
        usb_put_hcd(hcd);
fail_create_hcd:
        dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), retval);
        return retval;
}

static int mcs814x_ehci_remove(struct platform_device *pdev)
{
        struct usb_hcd *hcd = platform_get_drvdata(pdev);

        usb_remove_hcd(hcd);
        iounmap(hcd->regs);
        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
        usb_put_hcd(hcd);

        return 0;
}

MODULE_ALIAS("platform:mcs814x-ehci");

static const struct of_device_id mcs814x_ehci_id[] = {
        { .compatible = "moschip,mcs814x-ehci" },
        { .compatible = "usb-ehci" },
        { /* sentinel */ },
};

static struct platform_driver mcs814x_ehci_driver = {
        .probe = mcs814x_ehci_probe,
        .remove = mcs814x_ehci_remove,
        .driver = {
                .name = "mcs814x-ehci",
                .of_match_table = mcs814x_ehci_id,
        },
};