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/*
* This file is part of the coreboot project.
*
* 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.
*/
#include <console/console.h>
#include <arch/io.h>
#include <stdint.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include "northbridge.h"
#include "cn700.h"
/* This is the main AGP device, and only one used when configured for AGP 2.0 */
static void agp_init(device_t dev)
{
u32 reg32;
/* Some of this may not be necessary (should be handled by the OS). */
printk(BIOS_DEBUG, "Enabling AGP.\n");
/* Allow R/W access to AGP registers. */
pci_write_config8(dev, 0x4d, 0x15);
/* Setup PCI latency timer. */
pci_write_config8(dev, 0xd, 0x8);
/*
* Set to AGP 3.0 Mode, which should theoretically render the rest of
* the registers set here pointless.
*/
pci_write_config8(dev, 0x84, 0xb);
/* AGP Request Queue Size */
pci_write_config8(dev, 0x4a, 0x1f);
/*
* AGP Hardware Support (default 0xc4)
* 7: AGP SBA Enable (1 to Enable)
* 6: AGP Enable
* 5: Reserved
* 4: Fast Write Enable
* 3: AGP8X Mode Enable
* 2: AGP4X Mode Enable
* 1: AGP2X Mode Enable
* 0: AGP1X Mode Enable
*/
pci_write_config8(dev, 0x4b, 0xc4);
/* Enable AGP Backdoor */
pci_write_config8(dev, 0xb5, 0x03);
/* Set aperture to 32 MB. */
/* TODO: Use config option, explain how it works. */
pci_write_config32(dev, 0x94, 0x00010f38);
/* Set GART Table Base Address (31:12). */
pci_write_config32(dev, 0x98, (0x1558 << 12));
/* Set AGP Aperture Base. */
pci_write_config32(dev, 0x10, 0xf8000008);
/* Enable CPU/PMSTR GART Access. */
reg32 = pci_read_config8(dev, 0xbf);
reg32 |= 0x80;
pci_write_config8(dev, 0xbf, reg32);
/* Enable AGP Aperture. */
reg32 = pci_read_config32(dev, 0x94);
reg32 |= (3 << 7);
pci_write_config32(dev, 0x90, reg32);
/* AGP Control */
pci_write_config8(dev, 0xbc, 0x21);
pci_write_config8(dev, 0xbd, 0xd2);
/*
* AGP Pad, driving strength, and delay control. All this should be
* constant, seeing as the VGA controller is onboard.
*/
pci_write_config8(dev, 0x40, 0xc7);
pci_write_config8(dev, 0x41, 0xdb);
pci_write_config8(dev, 0x42, 0x10);
pci_write_config8(dev, 0x43, 0xdb);
pci_write_config8(dev, 0x44, 0x24);
/* AGPC CKG Control */
pci_write_config8(dev, 0xc0, 0x02);
pci_write_config8(dev, 0xc1, 0x02);
}
static const struct device_operations agp_operations = {
.read_resources = DEVICE_NOOP,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = agp_init,
.ops_pci = 0,
};
static const struct pci_driver agp_driver __pci_driver = {
.ops = &agp_operations,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_CN700_AGP,
};
/*
* This is the AGP 3.0 "bridge" @Bus 0 Device 1 Func 0. When using AGP 3.0, the
* config in this device takes presidence. We configure both just to be safe.
*/
static void agp_bridge_init(device_t dev)
{
printk(BIOS_DEBUG, "Setting up AGP bridge device\n");
pci_write_config16(dev, 0x4, 0x0007);
/* Secondary Bus Number */
pci_write_config8(dev, 0x19, 0x01);
/* Subordinate Bus Number */
pci_write_config8(dev, 0x1a, 0x01);
/* I/O Base */
pci_write_config8(dev, 0x1c, 0xd0);
/* I/O Limit */
pci_write_config8(dev, 0x1d, 0xd0);
/* Memory Base */
pci_write_config16(dev, 0x20, 0xfb00);
/* Memory Limit */
pci_write_config16(dev, 0x22, 0xfcf0);
/* Prefetchable Memory Base */
pci_write_config16(dev, 0x24, 0xf400);
/* Prefetchable Memory Limit */
pci_write_config16(dev, 0x26, 0xf7f0);
/* Enable VGA Compatible Memory/IO Range */
pci_write_config8(dev, 0x3e, 0x08);
/* Second PCI Bus Control (see datasheet) */
pci_write_config8(dev, 0x40, 0x83);
pci_write_config8(dev, 0x41, 0x43);
pci_write_config8(dev, 0x42, 0xe2);
pci_write_config8(dev, 0x43, 0x44);
pci_write_config8(dev, 0x44, 0x34);
pci_write_config8(dev, 0x45, 0x72);
}
static const struct device_operations agp_bridge_operations = {
.read_resources = DEVICE_NOOP,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_bus_enable_resources,
.init = agp_bridge_init,
.scan_bus = pci_scan_bridge,
.ops_pci = 0,
};
static const struct pci_driver agp_bridge_driver __pci_driver = {
.ops = &agp_bridge_operations,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_CN700_BRIDGE,
};
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