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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>
/**
* Setup the V-Link for VT8237R, 8X mode.
*
* For K8T890CF VIA recommends what is in VIA column, AW is award 8X:
*
* REG DEF AW VIA-8X VIA-4X
* -----------------------------
* NB V-Link Manual Driving Control strobe 0xb5 0x46 0x46 0x88 0x88
* NB V-Link Manual Driving Control - Data 0xb6 0x46 0x46 0x88 0x88
* NB V-Link Receiving Strobe Delay 0xb7 0x02 0x02 0x61 0x01
* NB V-Link Compensation Control bit4,0 (b5,b6) 0xb4 0x10 0x10 0x11 0x11
* SB V-Link Strobe Drive Control 0xb9 0x00 0xa5 0x98 0x98
* SB V-Link Data drive Control???? 0xba 0x00 0xbb 0x77 0x77
* SB V-Link Receive Strobe Delay???? 0xbb 0x04 0x11 0x11 0x11
* SB V-Link Compensation Control bit0 (use b9) 0xb8 0x00 0x01 0x01 0x01
* V-Link CKG Control 0xb0 0x05 0x05 0x06 0x03
* V-Link CKG Control 0xb1 0x05 0x05 0x01 0x03
*/
static void ctrl_init(struct device *dev)
{
u8 reg;
device_t devsb = dev_find_device(PCI_VENDOR_ID_VIA,
PCI_DEVICE_ID_VIA_VT8237R_LPC, 0);
if (!devsb)
return;
pci_write_config8(dev, 0xb5, 0x88);
pci_write_config8(dev, 0xb6, 0x88);
pci_write_config8(dev, 0xb7, 0x61);
reg = pci_read_config8(dev, 0xb4);
reg |= 0x11;
pci_write_config8(dev, 0xb4, reg);
pci_write_config8(dev, 0xb9, 0x98);
pci_write_config8(dev, 0xba, 0x77);
pci_write_config8(dev, 0xbb, 0x11);
reg = pci_read_config8(dev, 0xb8);
reg |= 0x1;
pci_write_config8(dev, 0xb8, reg);
pci_write_config8(dev, 0xb0, 0x06);
pci_write_config8(dev, 0xb1, 0x01);
/* Program V-link 8X 16bit full duplex, parity enabled. */
pci_write_config8(dev, 0x48, 0xa3);
}
static void ctrl_enable(struct device *dev)
{
u8 regm, regm2, regm3;
device_t devfun3 = dev_find_device(PCI_VENDOR_ID_VIA,
PCI_DEVICE_ID_VIA_K8T890CE_3, 0);
/* TODO: Fix some ordering issue fo V-link set Rx77[6] and PCI1_Rx4F[0]
should to 1 */
/* C2P Read ACK Return Priority */
/* PCI CFG Address bits[27:24] are used as extended register address
bit[11:8] */
pci_write_config8(dev, 0x47, 0x30);
/* Magic init. This is not well documented :/ */
pci_write_config8(dev, 0x70, 0xc2);
/* PCI Control */
pci_write_config8(dev, 0x72, 0xee);
pci_write_config8(dev, 0x73, 0x01);
pci_write_config8(dev, 0x74, 0x24);
pci_write_config8(dev, 0x75, 0x0f);
pci_write_config8(dev, 0x76, 0x50);
pci_write_config8(dev, 0x77, 0x08);
pci_write_config8(dev, 0x78, 0x01);
/* APIC on HT */
pci_write_config8(dev, 0x7c, 0x7f);
pci_write_config8(dev, 0x7f, 0x02);
/* WARNING: Need to copy some registers from NB (D0F3) to SB (D0F7). */
regm = pci_read_config8(devfun3, 0x88); /* Shadow mem CTRL */
pci_write_config8(dev, 0x57, regm);
regm = pci_read_config8(devfun3, 0x80); /* Shadow page C */
pci_write_config8(dev, 0x61, regm);
regm = pci_read_config8(devfun3, 0x81); /* Shadow page D */
pci_write_config8(dev, 0x62, regm);
regm = pci_read_config8(devfun3, 0x86); /* SMM and APIC decoding */
pci_write_config8(dev, 0xe6, regm);
regm3 = pci_read_config8(devfun3, 0x82);/* Shadow page E */
/*
* All access bits for 0xE0000-0xEFFFF encode as just 2 bits!
* So the NB reg is quite inconsistent, we expect there only 0xff or 0x00,
* and write them to 0x63 7-6 but! VIA 8237A has the mirror at 0x64!
*/
if (regm3 == 0xff)
regm3 = 0xc0;
else
regm3 = 0x0;
/* Shadow page F + memhole copy */
regm = pci_read_config8(devfun3, 0x83);
pci_write_config8(dev, 0x63, regm3 | (regm & 0x3F));
}
static struct device_operations ctrl_ops = {
.read_resources = pci_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.enable = ctrl_enable,
.init = ctrl_init,
.ops_pci = 0,
};
static const struct pci_driver northbridge_driver __pci_driver = {
.ops = &ctrl_ops,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_K8T890CE_7,
};
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