drivers/usb/host/ehci-vt8500.c

/*
 * drivers/usb/host/ehci-vt8500.c
 *
 * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
 *
 * Based on ehci-au1xxx.c
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/platform_device.h>

#include "ehci.h"

#define DRIVER_DESC "vt8500 On-Chip EHCI Host driver"

static const char hcd_name[] = "ehci-vt8500";

static struct hc_driver __read_mostly vt8500_ehci_hc_driver;

static const struct ehci_driver_overrides ehci_vt8500_overrides __initdata = {
	.reset = ehci_setup,
};

static u64 vt8500_ehci_dma_mask = DMA_BIT_MASK(32);

static int vt8500_ehci_drv_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct ehci_hcd *ehci;
	struct resource *res;
	int ret;

	if (usb_disabled())
		return -ENODEV;

	/*
	 * 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 have dma capability bindings this can go away.
	 */
	if (!pdev->dev.dma_mask)
		pdev->dev.dma_mask = &vt8500_ehci_dma_mask;

	if (pdev->resource[1].flags != IORESOURCE_IRQ) {
		pr_debug("resource[1] is not IORESOURCE_IRQ");
		return -ENOMEM;
	}
	hcd = usb_create_hcd(&vt8500_ehci_hc_driver, &pdev->dev, "VT8500");
	if (!hcd)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
	if (!hcd->regs) {
		pr_debug("ioremap failed");
		ret = -ENOMEM;
		goto err1;
	}

	ehci = hcd_to_ehci(hcd);
	ehci->caps = hcd->regs;

	ret = usb_add_hcd(hcd, pdev->resource[1].start,
			  IRQF_SHARED);
	if (ret == 0) {
		platform_set_drvdata(pdev, hcd);
		return ret;
	}

err1:
	usb_put_hcd(hcd);
	return ret;
}

static int vt8500_ehci_drv_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	usb_remove_hcd(hcd);
	usb_put_hcd(hcd);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static const struct of_device_id vt8500_ehci_ids[] = {
	{ .compatible = "via,vt8500-ehci", },
	{ .compatible = "wm,prizm-ehci", },
	{}
};

static struct platform_driver vt8500_ehci_driver = {
	.probe		= vt8500_ehci_drv_probe,
	.remove		= vt8500_ehci_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver = {
		.name	= hcd_name,
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(vt8500_ehci_ids),
	}
};

static int __init ehci_vt8500_init(void)
{
	if (usb_disabled())
		return -ENODEV;

	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
	ehci_init_driver(&vt8500_ehci_hc_driver, &ehci_vt8500_overrides);
	return platform_driver_register(&vt8500_ehci_driver);
}
module_init(ehci_vt8500_init);

static void __exit ehci_vt8500_cleanup(void)
{
	platform_driver_unregister(&vt8500_ehci_driver);
}
module_exit(ehci_vt8500_cleanup);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Alexey Charkov");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:vt8500-ehci");
MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);