linux_kernel/drivers/usb/dwc3/host.c

/**
 * host.c - DesignWare USB3 DRD Controller Host Glue
 *
 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2  of
 * the License as published by the Free Software Foundation.
 *
 * 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/platform_device.h>

#include "core.h"

static int dwc3_host_get_irq(struct dwc3 *dwc)
{
	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
	int irq;

	irq = platform_get_irq_byname(dwc3_pdev, "host");
	if (irq > 0)
		goto out;

	if (irq == -EPROBE_DEFER)
		goto out;

	irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
	if (irq > 0)
		goto out;

	if (irq == -EPROBE_DEFER)
		goto out;

	irq = platform_get_irq(dwc3_pdev, 0);
	if (irq > 0)
		goto out;

	if (irq != -EPROBE_DEFER)
		dev_err(dwc->dev, "missing host IRQ\n");

	if (!irq)
		irq = -EINVAL;

out:
	return irq;
}

int dwc3_host_init(struct dwc3 *dwc)
{
	struct property_entry	props[3];
	struct platform_device	*xhci;
	int			ret, irq;
	struct resource		*res;
	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
	int			prop_idx = 0;

	irq = dwc3_host_get_irq(dwc);
	if (irq < 0)
		return irq;

	res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
	if (!res)
		res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
				"dwc_usb3");
	if (!res)
		res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ, 0);
	if (!res)
		return -ENOMEM;

	dwc->xhci_resources[1].start = irq;
	dwc->xhci_resources[1].end = irq;
	dwc->xhci_resources[1].flags = res->flags;
	dwc->xhci_resources[1].name = res->name;

	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
	if (!xhci) {
		dev_err(dwc->dev, "couldn't allocate xHCI device\n");
		return -ENOMEM;
	}

	xhci->dev.parent	= dwc->dev;

	dwc->xhci = xhci;

	ret = platform_device_add_resources(xhci, dwc->xhci_resources,
						DWC3_XHCI_RESOURCES_NUM);
	if (ret) {
		dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
		goto err1;
	}

	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));

	if (dwc->usb3_lpm_capable)
		props[prop_idx++].name = "usb3-lpm-capable";

	/**
	 * WORKAROUND: dwc3 revisions <=3.00a have a limitation
	 * where Port Disable command doesn't work.
	 *
	 * The suggested workaround is that we avoid Port Disable
	 * completely.
	 *
	 * This following flag tells XHCI to do just that.
	 */
	if (dwc->revision <= DWC3_REVISION_300A)
		props[prop_idx++].name = "quirk-broken-port-ped";

	if (prop_idx) {
		ret = platform_device_add_properties(xhci, props);
		if (ret) {
			dev_err(dwc->dev, "failed to add properties to xHCI\n");
			goto err1;
		}
	}

	phy_create_lookup(dwc->usb2_generic_phy, "usb2-phy",
			  dev_name(dwc->dev));
	phy_create_lookup(dwc->usb3_generic_phy, "usb3-phy",
			  dev_name(dwc->dev));

	ret = platform_device_add(xhci);
	if (ret) {
		dev_err(dwc->dev, "failed to register xHCI device\n");
		goto err2;
	}

	return 0;
err2:
	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
			  dev_name(dwc->dev));
	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
			  dev_name(dwc->dev));
err1:
	platform_device_put(xhci);
	return ret;
}

void dwc3_host_exit(struct dwc3 *dwc)
{
	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
			  dev_name(dwc->dev));
	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
			  dev_name(dwc->dev));
	platform_device_unregister(dwc->xhci);
}