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/*
* This file is part of the LinuxBIOS project.
*
* Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2 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.
*
* 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 <device/device.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#include <device/pci_ids.h>
#include <console/console.h>
#include <cpu/x86/msr.h>
#include <cpu/amd/mtrr.h>
static void dram_enable(struct device *dev)
{
msr_t msr;
u16 reg;
/*
* Enable Lowest Interrupt arbitration for APIC, enable NB APIC
* decoding, MSI support,�no SMRAM, compatible SMM.
*/
pci_write_config8(dev, 0x86, 0x39);
/*
* We want to use the 0xC0000-0xEFFFF as RAM mark area as RW, even if
* memory is doing K8 the DMA from SB will fail if we have it wrong,
* AND even we have it here, we must later copy it to SB to make it work :/
*/
/* For CC000-CFFFF, bits 7:6 (10 = REn, 01 = WEn) bits 1:0 for
* C0000-C3FFF etc.
*/
pci_write_config8(dev, 0x80, 0xff);
/* For page D0000-DFFFF */
pci_write_config8(dev, 0x81, 0xff);
/* For page E0000-EFFFF */
pci_write_config8(dev, 0x82, 0xff);
pci_write_config8(dev, 0x83, 0x30);
msr = rdmsr(TOP_MEM);
reg = pci_read_config16(dev, 0x84);
reg &= 0xf;
pci_write_config16(dev, 0x84, (msr.lo >> 16) | reg);
reg = pci_read_config16(dev, 0x88);
reg &= 0xf800;
pci_write_config16(dev, 0x88, (msr.lo >> 24) | reg);
}
static struct device_operations dram_ops = {
.read_resources = pci_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.enable = dram_enable,
.ops_pci = 0,
};
static const struct pci_driver northbridge_driver __pci_driver = {
.ops = &dram_ops,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_K8T890CE_3,
};
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