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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#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(HOST_BRIDGE, CAPID0_A);
if (capid0_a & (1 << 23))
return;
/* Setup BARs */
MCHBAR32(GFXVTBAR + 4) = GFXVT_BASE >> 32;
MCHBAR32(GFXVTBAR) = GFXVT_BASE | 1;
MCHBAR32(VTVC0BAR + 4) = VTVC0_BASE >> 32;
MCHBAR32(VTVC0BAR) = VTVC0_BASE | 1;
/* Lock policies */
write32((void *)(GFXVT_BASE + 0xff0), 0x80000000);
const struct device *const azalia = pcidev_on_root(0x1b, 0);
if (azalia && azalia->enabled) {
write32((void *)(VTVC0_BASE + 0xff0), 0x20000000);
write32((void *)(VTVC0_BASE + 0xff0), 0xa0000000);
} else {
write32((void *)(VTVC0_BASE + 0xff0), 0x80000000);
}
}
static void enable_pam_region(void)
{
pci_write_config8(HOST_BRIDGE, PAM0, 0x30);
pci_write_config8(HOST_BRIDGE, PAM1, 0x33);
pci_write_config8(HOST_BRIDGE, PAM2, 0x33);
pci_write_config8(HOST_BRIDGE, PAM3, 0x33);
pci_write_config8(HOST_BRIDGE, PAM4, 0x33);
pci_write_config8(HOST_BRIDGE, PAM5, 0x33);
pci_write_config8(HOST_BRIDGE, 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(HOST_BRIDGE, EPBAR, DEFAULT_EPBAR | 1);
pci_write_config32(HOST_BRIDGE, EPBAR + 4, (0LL + DEFAULT_EPBAR) >> 32);
pci_write_config32(HOST_BRIDGE, MCHBAR, (uintptr_t)DEFAULT_MCHBAR | 1);
pci_write_config32(HOST_BRIDGE, MCHBAR + 4, (0LL + (uintptr_t)DEFAULT_MCHBAR) >> 32);
pci_write_config32(HOST_BRIDGE, DMIBAR, (uintptr_t)DEFAULT_DMIBAR | 1);
pci_write_config32(HOST_BRIDGE, 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, 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(HOST_BRIDGE, 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(HOST_BRIDGE, 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(SSKPD_HI);
reg32 |= (1 << 31);
MCHBAR32(SSKPD_HI) = reg32;
/* VLW (Virtual Legacy Wire?) */
reg32 = MCHBAR32(0x6120);
reg32 &= ~(1 << 0);
MCHBAR32(0x6120) = reg32;
reg32 = MCHBAR32(INTRDIRCTL);
reg32 |= (1 << 4) | (1 << 5);
MCHBAR32(INTRDIRCTL) = reg32;
}
static void start_peg_link_training(void)
{
u32 tmp, deven;
const u16 base_rev = pci_read_config16(HOST_BRIDGE, PCI_DEVICE_ID) & BASE_REV_MASK;
/*
* PEG on IvyBridge+ needs a special startup sequence.
* As the MRC has its own initialization code skip it.
*/
if ((base_rev != BASE_REV_IVB) || CONFIG(HAVE_MRC))
return;
deven = pci_read_config32(HOST_BRIDGE, DEVEN);
/*
* For each PEG device, set bit 5 to use three retries for OC (Offset Calibration).
* We also clear DEFER_OC (bit 16) in order to start PEG training.
*/
if (deven & DEVEN_PEG10) {
tmp = pci_read_config32(PCI_DEV(0, 1, 0), AFE_PWRON) & ~(1 << 16);
pci_write_config32(PCI_DEV(0, 1, 0), AFE_PWRON, tmp | (1 << 5));
}
if (deven & DEVEN_PEG11) {
tmp = pci_read_config32(PCI_DEV(0, 1, 1), AFE_PWRON) & ~(1 << 16);
pci_write_config32(PCI_DEV(0, 1, 1), AFE_PWRON, tmp | (1 << 5));
}
if (deven & DEVEN_PEG12) {
tmp = pci_read_config32(PCI_DEV(0, 1, 2), AFE_PWRON) & ~(1 << 16);
pci_write_config32(PCI_DEV(0, 1, 2), AFE_PWRON, tmp | (1 << 5));
}
if (deven & DEVEN_PEG60) {
tmp = pci_read_config32(PCI_DEV(0, 6, 0), AFE_PWRON) & ~(1 << 16);
pci_write_config32(PCI_DEV(0, 6, 0), AFE_PWRON, 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(HOST_BRIDGE, CAPID0_A);
if (capid0_a & (1 << 10)) {
const size_t is_mobile = get_platform_type() == PLATFORM_MOBILE;
reg8 = pci_read_config8(HOST_BRIDGE, DIDOR);
reg8 &= ~7; /* Clear 2:0 */
if (is_mobile)
reg8 |= 1; /* Set bit 0 */
pci_write_config8(HOST_BRIDGE, DIDOR, 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(HOST_BRIDGE, DEVEN) | DEVEN_IGD;
pci_write_config32(HOST_BRIDGE, DEVEN, deven);
sandybridge_setup_graphics();
/*
* Write magic values 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 that PEG is up as soon as PCI enumeration starts.
*
* TODO: use timestamps to ensure the timings are met.
*/
start_peg_link_training();
}
void northbridge_romstage_finalize(int s3resume)
{
MCHBAR16(SSKPD_HI) = 0xCAFE;
romstage_handoff_init(s3resume);
}
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