linux_dsm_epyc7002/drivers/usb/host/ehci-sead3.c

/*
 * MIPS CI13320A EHCI Host Controller driver
 * Based on "ehci-au1xxx.c" by K.Boge <karsten.boge@amd.com>
 *
 * Copyright (C) 2012 MIPS Technologies, Inc.
 *
 * 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.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/platform_device.h>

static int ehci_sead3_setup(struct usb_hcd *hcd)
{
	int ret;
	struct ehci_hcd *ehci = hcd_to_ehci(hcd);

	ehci->caps = hcd->regs + 0x100;

#ifdef __BIG_ENDIAN
	ehci->big_endian_mmio = 1;
	ehci->big_endian_desc = 1;
#endif

	ret = ehci_setup(hcd);
	if (ret)
		return ret;

	ehci->need_io_watchdog = 0;

	/* Set burst length to 16 words. */
	ehci_writel(ehci, 0x1010, &ehci->regs->reserved[1]);

	return ret;
}

const struct hc_driver ehci_sead3_hc_driver = {
	.description		= hcd_name,
	.product_desc		= "SEAD-3 EHCI",
	.hcd_priv_size		= sizeof(struct ehci_hcd),

	/*
	 * generic hardware linkage
	 */
	.irq			= ehci_irq,
	.flags			= HCD_MEMORY | HCD_USB2,

	/*
	 * basic lifecycle operations
	 *
	 */
	.reset			= ehci_sead3_setup,
	.start			= ehci_run,
	.stop			= ehci_stop,
	.shutdown		= ehci_shutdown,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue		= ehci_urb_enqueue,
	.urb_dequeue		= ehci_urb_dequeue,
	.endpoint_disable	= ehci_endpoint_disable,
	.endpoint_reset		= ehci_endpoint_reset,

	/*
	 * scheduling support
	 */
	.get_frame_number	= ehci_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data	= ehci_hub_status_data,
	.hub_control		= ehci_hub_control,
	.bus_suspend		= ehci_bus_suspend,
	.bus_resume		= ehci_bus_resume,
	.relinquish_port	= ehci_relinquish_port,
	.port_handed_over	= ehci_port_handed_over,

	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
};

static int ehci_hcd_sead3_drv_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct resource *res;
	int ret;

	if (usb_disabled())
		return -ENODEV;

	if (pdev->resource[1].flags != IORESOURCE_IRQ) {
		pr_debug("resource[1] is not IORESOURCE_IRQ");
		return -ENOMEM;
	}
	hcd = usb_create_hcd(&ehci_sead3_hc_driver, &pdev->dev, "SEAD-3");
	if (!hcd)
		return -ENOMEM;

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

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
		pr_debug("request_mem_region failed");
		ret = -EBUSY;
		goto err1;
	}

	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
		pr_debug("ioremap failed");
		ret = -ENOMEM;
		goto err2;
	}

	/* Root hub has integrated TT. */
	hcd->has_tt = 1;

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

	iounmap(hcd->regs);
err2:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
	usb_put_hcd(hcd);
	return ret;
}

static int ehci_hcd_sead3_drv_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);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

#ifdef CONFIG_PM
static int ehci_hcd_sead3_drv_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	bool do_wakeup = device_may_wakeup(dev);

	return ehci_suspend(hcd, do_wakeup);
}

static int ehci_hcd_sead3_drv_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);

	ehci_resume(hcd, false);
	return 0;
}

static const struct dev_pm_ops sead3_ehci_pmops = {
	.suspend	= ehci_hcd_sead3_drv_suspend,
	.resume		= ehci_hcd_sead3_drv_resume,
};

#define SEAD3_EHCI_PMOPS (&sead3_ehci_pmops)

#else
#define SEAD3_EHCI_PMOPS NULL
#endif

static struct platform_driver ehci_hcd_sead3_driver = {
	.probe		= ehci_hcd_sead3_drv_probe,
	.remove		= ehci_hcd_sead3_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver = {
		.name	= "sead3-ehci",
		.owner	= THIS_MODULE,
		.pm	= SEAD3_EHCI_PMOPS,
	}
};

MODULE_ALIAS("platform:sead3-ehci");