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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 secunet Security Networks AG
* Copyright (C) 2015 Damien Zammit <damien@zamaudio.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; 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.
*/
#define __SIMPLE_DEVICE__
#include <cbmem.h>
#include <commonlib/helpers.h>
#include <stdint.h>
#include <arch/io.h>
#include <device/pci_def.h>
#include <console/console.h>
#include <northbridge/intel/x4x/x4x.h>
/** Decodes used Graphics Mode Select (GMS) to kilobytes. */
u32 decode_igd_memory_size(const u32 gms)
{
static const u16 ggc2uma[] = { 0, 1, 4, 8, 16,
32, 48, 64, 128, 256, 96, 160, 224, 352 };
if (gms > ARRAY_SIZE(ggc2uma))
die("Bad Graphics Mode Select (GMS) setting.\n");
return ggc2uma[gms] << 10;
}
/** Decodes used GTT Graphics Memory Size (GGMS) to kilobytes. */
u32 decode_igd_gtt_size(const u32 gsm)
{
static const u8 ggc2gtt[] = { 0, 1, 0, 2, 0, 0, 0, 0, 0, 2, 3, 4};
if (gsm > ARRAY_SIZE(ggc2gtt))
die("Bad GTT Graphics Memory Size (GGMS) setting.\n");
return ggc2gtt[gsm] << 10;
}
u8 decode_pciebar(u32 *const base, u32 *const len)
{
*base = 0;
*len = 0;
const pci_devfn_t dev = PCI_DEV(0,0,0);
u32 pciexbar = 0;
u32 pciexbar_reg;
u32 reg32;
int max_buses;
const struct {
u16 num_buses;
u32 addr_mask;
} busmask[] = {
{256, 0xf0000000},
{128, 0xf8000000},
{64, 0xfc000000},
{0, 0},
};
pciexbar_reg = pci_read_config32(dev, D0F0_PCIEXBAR_LO);
if (!(pciexbar_reg & 1)) {
printk(BIOS_WARNING, "WARNING: MMCONF not set\n");
return 0;
}
reg32 = (pciexbar_reg >> 1) & 3;
pciexbar = pciexbar_reg & busmask[reg32].addr_mask;
max_buses = busmask[reg32].num_buses;
if (!pciexbar) {
printk(BIOS_WARNING, "WARNING: pciexbar invalid\n");
return 0;
}
*base = pciexbar;
*len = max_buses << 20;
return 1;
}
void *cbmem_top(void)
{
u32 ramtop = pci_read_config32(PCI_DEV(0,0,0), D0F0_TSEG);
return (void*)(ramtop);
}
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