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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007-2010 coresystems GmbH
* Copyright (C) 2015 secunet Security Networks AG
* Copyright (C) 2011 Google Inc
* Copyright (C) 2018 Patrick Rudolph <patrick.rudolph@9elements.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.
*/
#include <console/console.h>
#include <device/mmio.h>
#include <device/device.h>
#include <device/pci_ops.h>
#include <device/pci_def.h>
#include <option.h>
#include <romstage_handoff.h>
#include <types.h>
#include "sandybridge.h"
static void systemagent_vtd_init(void)
{
const u32 capid0_a = pci_read_config32(PCI_DEV(0, 0, 0), CAPID0_A);
if (capid0_a & (1 << 23))
return;
/* setup BARs */
MCHBAR32(VTD1_BASE + 4) = IOMMU_BASE1 >> 32;
MCHBAR32(VTD1_BASE) = IOMMU_BASE1 | 1;
MCHBAR32(VTD2_BASE + 4) = IOMMU_BASE2 >> 32;
MCHBAR32(VTD2_BASE) = IOMMU_BASE2 | 1;
/* lock policies */
write32((void *)(IOMMU_BASE1 + 0xff0), 0x80000000);
const struct device *const azalia = pcidev_on_root(0x1b, 0);
if (azalia && azalia->enabled) {
write32((void *)(IOMMU_BASE2 + 0xff0), 0x20000000);
write32((void *)(IOMMU_BASE2 + 0xff0), 0xa0000000);
} else {
write32((void *)(IOMMU_BASE2 + 0xff0), 0x80000000);
}
}
static void enable_pam_region(void)
{
pci_write_config8(PCI_DEV(0, 0x00, 0), PAM0, 0x30);
pci_write_config8(PCI_DEV(0, 0x00, 0), PAM1, 0x33);
pci_write_config8(PCI_DEV(0, 0x00, 0), PAM2, 0x33);
pci_write_config8(PCI_DEV(0, 0x00, 0), PAM3, 0x33);
pci_write_config8(PCI_DEV(0, 0x00, 0), PAM4, 0x33);
pci_write_config8(PCI_DEV(0, 0x00, 0), PAM5, 0x33);
pci_write_config8(PCI_DEV(0, 0x00, 0), PAM6, 0x33);
}
static void sandybridge_setup_bars(void)
{
printk(BIOS_DEBUG, "Setting up static northbridge registers...");
/* Set up all hardcoded northbridge BARs */
pci_write_config32(PCI_DEV(0, 0x00, 0), EPBAR, DEFAULT_EPBAR | 1);
pci_write_config32(PCI_DEV(0, 0x00, 0), EPBAR + 4, (0LL+DEFAULT_EPBAR) >> 32);
pci_write_config32(PCI_DEV(0, 0x00, 0), MCHBAR, (uintptr_t)DEFAULT_MCHBAR | 1);
pci_write_config32(PCI_DEV(0, 0x00, 0), MCHBAR + 4, (0LL+(uintptr_t)DEFAULT_MCHBAR) >> 32);
pci_write_config32(PCI_DEV(0, 0x00, 0), DMIBAR, (uintptr_t)DEFAULT_DMIBAR | 1);
pci_write_config32(PCI_DEV(0, 0x00, 0), DMIBAR + 4, (0LL+(uintptr_t)DEFAULT_DMIBAR) >> 32);
printk(BIOS_DEBUG, " done\n");
}
static void sandybridge_setup_graphics(void)
{
u32 reg32;
u16 reg16;
u8 reg8;
u8 gfxsize;
reg16 = pci_read_config16(PCI_DEV(0,2,0), PCI_DEVICE_ID);
switch (reg16) {
case 0x0102: /* GT1 Desktop */
case 0x0106: /* GT1 Mobile */
case 0x010a: /* GT1 Server */
case 0x0112: /* GT2 Desktop */
case 0x0116: /* GT2 Mobile */
case 0x0122: /* GT2 Desktop >=1.3GHz */
case 0x0126: /* GT2 Mobile >=1.3GHz */
case 0x0152: /* IvyBridge */
case 0x0156: /* IvyBridge */
case 0x0162: /* IvyBridge */
case 0x0166: /* IvyBridge */
case 0x016a: /* IvyBridge */
break;
default:
printk(BIOS_DEBUG, "Graphics not supported by this CPU/chipset.\n");
return;
}
printk(BIOS_DEBUG, "Initializing Graphics...\n");
if (get_option(&gfxsize, "gfx_uma_size") != CB_SUCCESS) {
/* Setup IGD memory by setting GGC[7:3] = 1 for 32MB */
gfxsize = 0;
}
reg16 = pci_read_config16(PCI_DEV(0,0,0), GGC);
reg16 &= ~0x00f8;
reg16 |= (gfxsize + 1) << 3;
/* Program GTT memory by setting GGC[9:8] = 2MB */
reg16 &= ~0x0300;
reg16 |= 2 << 8;
/* Enable VGA decode */
reg16 &= ~0x0002;
pci_write_config16(PCI_DEV(0,0,0), GGC, reg16);
/* Enable 256MB aperture */
reg8 = pci_read_config8(PCI_DEV(0, 2, 0), MSAC);
reg8 &= ~0x06;
reg8 |= 0x02;
pci_write_config8(PCI_DEV(0, 2, 0), MSAC, reg8);
/* Erratum workarounds */
reg32 = MCHBAR32(SAPMCTL);
reg32 |= (1 << 9)|(1 << 10);
MCHBAR32(SAPMCTL) = reg32;
/* Enable SA Clock Gating */
reg32 = MCHBAR32(SAPMCTL);
MCHBAR32(SAPMCTL) = reg32 | 1;
/* GPU RC6 workaround for sighting 366252 */
reg32 = MCHBAR32(0x5d14);
reg32 |= (1 << 31);
MCHBAR32(0x5d14) = reg32;
/* VLW */
reg32 = MCHBAR32(0x6120);
reg32 &= ~(1 << 0);
MCHBAR32(0x6120) = reg32;
reg32 = MCHBAR32(PAIR_CTL);
reg32 |= (1 << 4) | (1 << 5);
MCHBAR32(PAIR_CTL) = reg32;
}
static void start_peg_link_training(void)
{
u32 tmp;
u32 deven;
/* PEG on IvyBridge+ needs a special startup sequence.
* As the MRC has its own initialization code skip it. */
if (((pci_read_config16(PCI_DEV(0, 0, 0), PCI_DEVICE_ID) &
BASE_REV_MASK) != BASE_REV_IVB) ||
CONFIG(HAVE_MRC))
return;
deven = pci_read_config32(PCI_DEV(0, 0, 0), DEVEN);
if (deven & DEVEN_PEG10) {
tmp = pci_read_config32(PCI_DEV(0, 1, 0), 0xC24) & ~(1 << 16);
pci_write_config32(PCI_DEV(0, 1, 0), 0xC24, tmp | (1 << 5));
}
if (deven & DEVEN_PEG11) {
tmp = pci_read_config32(PCI_DEV(0, 1, 1), 0xC24) & ~(1 << 16);
pci_write_config32(PCI_DEV(0, 1, 1), 0xC24, tmp | (1 << 5));
}
if (deven & DEVEN_PEG12) {
tmp = pci_read_config32(PCI_DEV(0, 1, 2), 0xC24) & ~(1 << 16);
pci_write_config32(PCI_DEV(0, 1, 2), 0xC24, tmp | (1 << 5));
}
if (deven & DEVEN_PEG60) {
tmp = pci_read_config32(PCI_DEV(0, 6, 0), 0xC24) & ~(1 << 16);
pci_write_config32(PCI_DEV(0, 6, 0), 0xC24, tmp | (1 << 5));
}
}
void systemagent_early_init(void)
{
u32 capid0_a;
u32 deven;
u8 reg8;
/* Device ID Override Enable should be done very early */
capid0_a = pci_read_config32(PCI_DEV(0, 0, 0), 0xe4);
if (capid0_a & (1 << 10)) {
const size_t is_mobile = get_platform_type() == PLATFORM_MOBILE;
reg8 = pci_read_config8(PCI_DEV(0, 0, 0), 0xf3);
reg8 &= ~7; /* Clear 2:0 */
if (is_mobile)
reg8 |= 1; /* Set bit 0 */
pci_write_config8(PCI_DEV(0, 0, 0), 0xf3, reg8);
}
/* Setup all BARs required for early PCIe and raminit */
sandybridge_setup_bars();
/* Set C0000-FFFFF to access RAM on both reads and writes */
enable_pam_region();
/* Setup IOMMU BARs */
systemagent_vtd_init();
/* Device Enable, don't touch PEG bits */
deven = pci_read_config32(PCI_DEV(0, 0, 0), DEVEN) | DEVEN_IGD;
pci_write_config32(PCI_DEV(0, 0, 0), DEVEN, deven);
sandybridge_setup_graphics();
/* Write magic value to start PEG link training.
* This should be done in PCI device enumeration, but
* the PCIe specification requires to wait at least 100msec
* after reset for devices to come up.
* As we don't want to increase boot time, enable it early and
* assume the PEG is up as soon as PCI enumeration starts.
* TODO: use time stamps to ensure the timings are met */
start_peg_link_training();
}
void northbridge_romstage_finalize(int s3resume)
{
MCHBAR16(SSKPD) = 0xCAFE;
romstage_handoff_init(s3resume);
}
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