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

/*
 * EHCI HCD for Netlogic XLS processors.
 *
 * (C) Copyright 2011 Netlogic Microsystems Inc.
 *
 *  Based on various ehci-*.c drivers
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 */

#include <linux/platform_device.h>

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

	ehci->caps = hcd->regs;
	ehci->regs = hcd->regs +
		HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
	dbg_hcs_params(ehci, "reset");
	dbg_hcc_params(ehci, "reset");

	/* cache this readonly data; minimize chip reads */
	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);

	retval = ehci_halt(ehci);
	if (retval)
		return retval;

	/* data structure init */
	retval = ehci_init(hcd);
	if (retval)
		return retval;

	ehci_reset(ehci);

	return retval;
}

int ehci_xls_probe_internal(const struct hc_driver *driver,
	struct platform_device *pdev)
{
	struct usb_hcd  *hcd;
	struct resource *res;
	int retval, irq;

	/* Get our IRQ from an earlier registered Platform Resource */
	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "Found HC with no IRQ. Check %s setup!\n",
				dev_name(&pdev->dev));
		return -ENODEV;
	}

	/* Get our Memory Handle */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "Error: MMIO Handle %s setup!\n",
				dev_name(&pdev->dev));
		return -ENODEV;
	}
	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		retval = -ENOMEM;
		goto err1;
	}

	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 err2;
	}
	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 err3;
	}

	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (retval != 0)
		goto err4;
	return retval;

err4:
	iounmap(hcd->regs);
err3:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err2:
	usb_put_hcd(hcd);
err1:
	dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev),
			retval);
	return retval;
}

static struct hc_driver ehci_xls_hc_driver = {
	.description	= hcd_name,
	.product_desc	= "XLS EHCI Host Controller",
	.hcd_priv_size	= sizeof(struct ehci_hcd),
	.irq		= ehci_irq,
	.flags		= HCD_USB2 | HCD_MEMORY,
	.reset		= ehci_xls_setup,
	.start		= ehci_run,
	.stop		= ehci_stop,
	.shutdown	= ehci_shutdown,

	.urb_enqueue	= ehci_urb_enqueue,
	.urb_dequeue	= ehci_urb_dequeue,
	.endpoint_disable = ehci_endpoint_disable,
	.endpoint_reset	= ehci_endpoint_reset,

	.get_frame_number = ehci_get_frame,

	.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_xls_probe(struct platform_device *pdev)
{
	if (usb_disabled())
		return -ENODEV;

	return ehci_xls_probe_internal(&ehci_xls_hc_driver, pdev);
}

static int ehci_xls_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("ehci-xls");

static struct platform_driver ehci_xls_driver = {
	.probe		= ehci_xls_probe,
	.remove		= ehci_xls_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver		= {
		.name = "ehci-xls",
	},
};