/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008-2009 coresystems GmbH
 *
 * 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.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include "pch.h"
#include <usbdebug.h>
#include <arch/io.h>

static void usb_ehci_clock_gating(struct device *dev)
{
	u32 reg32;

	/* IOBP 0xE5004001[7:6] = 11b */
	pch_iobp_update(0xe5004001, ~0, (1 << 7)|(1 << 6));

	/* Dx:F0:DCh[5,2,1] = 111b
	 * Dx:F0:DCh[0] = 1b when EHCI controller is disabled */
	reg32 = pci_read_config32(dev, 0xdc);
	reg32 |= (1 << 5) | (1 << 2) | (1 << 1);
	pci_write_config32(dev, 0xdc, reg32);

	/* Dx:F0:78h[1:0] = 11b */
	reg32 = pci_read_config32(dev, 0x78);
	reg32 |= (1 << 1) | (1 << 0);
	pci_write_config32(dev, 0x78, reg32);
}

static void usb_ehci_init(struct device *dev)
{
	printk(BIOS_DEBUG, "EHCI: Setting up controller.. ");

	usb_ehci_clock_gating(dev);

	/* Disable Wake on Disconnect in RMH */
	RCBA32_OR(0x35b0, 0x00000022);

	printk(BIOS_DEBUG, "done.\n");
}

static void usb_ehci_set_subsystem(device_t dev, unsigned vendor, unsigned 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 struct pci_operations lops_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,
	.init			= usb_ehci_init,
	.scan_bus		= 0,
	.ops_pci		= &lops_pci,
};

static const unsigned short pci_device_ids[] = { 0x9c26, 0x8c26, 0x8c2d, 0 };

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