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/*
* This file is part of the LinuxBIOS project.
*
* Copyright (C) 2005 Digital Design Corporation
* (Written by Steven J. Magnani <steve@digidescorp.com> for Digital Design)
* Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include "i82801xx.h"
void i82801xx_enable(device_t dev)
{
unsigned int index = 0;
uint16_t cur_disable_mask, new_disable_mask;
/* All 82801xx devices should be on bus 0. */
unsigned int devfn = PCI_DEVFN(0x1f, 0); // LPC
device_t lpc_dev = dev_find_slot(0, devfn); // 0
if (!lpc_dev)
return;
/* We're going to assume, perhaps incorrectly, that if a function
* exists it can be disabled. Workarounds for ICH variants that don't
* follow this should be done by checking the device ID.
*/
if (PCI_SLOT(dev->path.u.pci.devfn) == 31) {
index = PCI_FUNC(dev->path.u.pci.devfn);
} else if (PCI_SLOT(dev->path.u.pci.devfn) == 29) {
index = 8 + PCI_FUNC(dev->path.u.pci.devfn);
}
/* Function 0 is a bit of an exception. */
if (index == 0) {
index = 14;
}
cur_disable_mask = pci_read_config16(lpc_dev, FUNC_DIS);
new_disable_mask = cur_disable_mask & ~(1 << index); /* Enable it. */
if (!dev->enabled) {
new_disable_mask |= (1 << index); /* Disable it, if desired. */
}
if (new_disable_mask != cur_disable_mask) {
pci_write_config16(lpc_dev, FUNC_DIS, new_disable_mask);
}
}
struct chip_operations southbridge_intel_i82801xx_ops = {
CHIP_NAME("Intel 82801 Series Southbridge")
.enable_dev = i82801xx_enable,
};
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