src/soc/intel/broadwell/ehci.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008-2009 coresystems GmbH
 * Copyright (C) 2014 Google 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; version 2 of the License.
 *
 * 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 <delay.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ehci.h>
#include <arch/io.h>
#include <soc/ehci.h>
#include <soc/pch.h>

static void usb_ehci_set_subsystem(struct device *dev, unsigned int vendor,
	unsigned int device)
{
	u8 access_cntl;

	access_cntl = pci_read_config8(dev, 0x80);

	/* Enable writes to protected registers. */
	pci_write_config8(dev, 0x80, access_cntl | 1);

	if (!vendor || !device) {
		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
				pci_read_config32(dev, PCI_VENDOR_ID));
	} else {
		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
				((device & 0xffff) << 16) | (vendor & 0xffff));
	}

	/* Restore protection. */
	pci_write_config8(dev, 0x80, access_cntl);
}

static void ehci_enable(struct device *dev)
{
	if (CONFIG_USBDEBUG)
		dev->enabled = 1;
	else
		pch_disable_devfn(dev);
}

static struct pci_operations ehci_ops_pci = {
	.set_subsystem	= &usb_ehci_set_subsystem,
};

static struct device_operations usb_ehci_ops = {
	.read_resources		= pci_ehci_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= pci_dev_enable_resources,
	.ops_pci		= &ehci_ops_pci,
	.enable			= ehci_enable,
};

static const unsigned short pci_device_ids[] = {
	0x9c26, /* LynxPoint-LP */
	0x9ca6, /* WildcatPoint */
	0
};

static const struct pci_driver pch_usb_ehci __pci_driver = {
	.ops	 = &usb_ehci_ops,
	.vendor	 = PCI_VENDOR_ID_INTEL,
	.devices = pci_device_ids,
};