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/*
* This file is part of the coreboot 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 as published by
* the Free Software Foundation; version 2 of the License.
*
* 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_ids.h>
#include <console/console.h>
#include <cpu/x86/msr.h>
#include <cpu/amd/mtrr.h>
#include <pc80/mc146818rtc.h>
#include <bitops.h>
#include "k8t890.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;
/* The Address Next to the Last Valid DRAM Address */
pci_write_config16(dev, 0x88, (msr.lo >> 24) | reg);
}
#if CONFIG_GFXUMA
extern uint64_t uma_memory_base, uma_memory_size;
#endif
static void dram_enable_k8m890(struct device *dev)
{
#if CONFIG_GFXUMA
msr_t msr;
int ret;
unsigned int fbbits;
/* use CMOS */
if (CONFIG_VIDEO_MB == -1) {
ret = get_option(&fbbits, "videoram_size");
if (ret) {
printk(BIOS_WARNING, "Failed to get videoram size (error %d), using default.\n", ret);
fbbits = 5;
}
if ((fbbits < 1) || (fbbits > 7)) {
printk(BIOS_WARNING, "Invalid videoram size (%d), using default.\n",
4 << fbbits);
fbbits = 5;
}
uma_memory_size = 4 << (fbbits + 20);
} else {
uma_memory_size = (CONFIG_VIDEO_MB << 20);
}
msr = rdmsr(TOP_MEM);
uma_memory_base = msr.lo - uma_memory_size;
printk(BIOS_INFO, "K8M890: UMA base is %llx size is %u (MB)\n", uma_memory_base,
(u32) (uma_memory_size / 1024 / 1024));
/* enable VGA, so the bridges gets VGA_EN and resources are set */
pci_write_config8(dev, 0xa1, 0x80);
#endif
dram_enable(dev);
}
int
k8m890_host_fb_size_get(void)
{
struct device *dev = dev_find_device(PCI_VENDOR_ID_VIA,
PCI_DEVICE_ID_VIA_K8M890CE_3, 0);
unsigned char tmp;
tmp = pci_read_config8(dev, 0xA1);
tmp >>= 4;
if (tmp & 0x08)
return 4 << (tmp & 7);
else
return 0;
}
static void dram_init_fb(struct device *dev)
{
#if CONFIG_GFXUMA
/* Important bits:
* Enable the internal GFX bit 7 of reg 0xa1 plus in same reg:
* bits 6:4 X fbuffer size will be 2^(X+2) or 100 = 64MB, 101 = 128MB
* bits 3:0 BASE [31:28]
* reg 0xa0 bits 7:1 BASE [27:21] bit0 enable CPU access
*/
unsigned int fbbits = 0;
u8 tmp;
fbbits = ((log2(uma_memory_size >> 20) - 2) << 4);
printk(BIOS_INFO, "K8M890: Using a %dMB framebuffer.\n", (unsigned int) (uma_memory_size >> 20));
/* Step 1: enable UMA but no FB */
pci_write_config8(dev, 0xa1, 0x80);
/* Step 2: enough is just the FB size, the CPU accessible address is not needed */
tmp = fbbits | 0x80;
pci_write_config8(dev, 0xa1, tmp);
/* TODO K8 needs some UMA fine tuning too maybe call some generic routine here? */
#endif
}
static const struct device_operations dram_ops_t = {
.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 device_operations dram_ops_m = {
.read_resources = pci_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.enable = dram_enable_k8m890,
.init = dram_init_fb,
.ops_pci = 0,
};
static const struct pci_driver northbridge_driver_t __pci_driver = {
.ops = &dram_ops_t,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_K8T890CE_3,
};
static const struct pci_driver northbridge_driver_tcf __pci_driver = {
.ops = &dram_ops_t,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_K8T890CF_3,
};
static const struct pci_driver northbridge_driver_m __pci_driver = {
.ops = &dram_ops_m,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_K8M890CE_3,
};
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