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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Silicon Integrated Systems Corp. (SiS)
* Written by Morgan Tsai <my_tsai@sis.com> for SiS.
*
* 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.
*/
/*
* Turn off machine check triggers when reading
* pci space where there are no devices.
* This is necessary when scanning the bus for
* devices which is done by the kernel
*
* written in 2003 by Eric Biederman
*
* - Athlon64 workarounds by Stefan Reinauer
* - "reset once" logic by Yinghai Lu
*/
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <pc80/mc146818rtc.h>
#include <cpu/amd/model_fxx_rev.h>
#include <arch/io.h>
typedef struct msr_struct
{
unsigned lo;
unsigned hi;
} msr_t;
static inline msr_t rdmsr(unsigned index)
{
msr_t result;
result.lo = 0;
result.hi = 0;
return result;
}
/**
* Read resources for AGP aperture.
*
* There is only one AGP aperture resource needed. The resource is added to
* the northbridge of BSP.
*
* The same trick can be used to augment legacy VGA resources which can
* be detect by generic PCI resource allocator for VGA devices.
* BAD: it is more tricky than I think, the resource allocation code is
* implemented in a way to NOT DOING legacy VGA resource allocation on
* purpose :-(.
*
* @param dev TODO
*/
static void sis761_read_resources(struct device *dev)
{
/* Read the generic PCI resources */
printk(BIOS_DEBUG, "sis761_read_resources ------->\n");
pci_dev_read_resources(dev);
/* If we are not the first processor don't allocate the gart aperture */
if (dev->path.pci.devfn != PCI_DEVFN(0x0, 0)) {
printk(BIOS_DEBUG, "sis761_not_the_first_processor !!!\n");
return;
}
printk(BIOS_DEBUG, "sis761_read_resources <-------\n");
return;
}
static void sis761_set_resources(struct device *dev)
{
printk(BIOS_DEBUG, "sis761_set_resources ------->\n");
/* Set the generic PCI resources */
pci_dev_set_resources(dev);
printk(BIOS_DEBUG, "sis761_set_resources <-------\n");
}
static void sis761_init(struct device *dev)
{
int needs_reset;
msr_t msr;
needs_reset = 0;
printk(BIOS_DEBUG, "sis761_init: ---------->\n");
msr = rdmsr(0xC001001A);
pci_write_config16(dev, 0x8E, msr.lo >> 16); // Topbound
pci_write_config8(dev, 0x7F, 0x08); // ACPI Base
outb(inb(0x856) | 0x40, 0x856); // Auto-Reset Function
printk(BIOS_DEBUG, "sis761_init: <----------\n");
}
static struct device_operations sis761_ops = {
.read_resources = sis761_read_resources,
.set_resources = sis761_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = sis761_init,
.scan_bus = 0,
.ops_pci = 0,
};
static const struct pci_driver sis761_driver __pci_driver = {
.ops = &sis761_ops,
.vendor = PCI_VENDOR_ID_SIS,
.device = PCI_DEVICE_ID_SIS_SIS761,
};
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