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/* SPDX-License-Identifier: GPL-2.0-only */
#include <stdint.h>
#include <console/console.h>
#include <device/mmio.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
#include "haswell.h"
static bool peg_hidden[3];
static void haswell_setup_bars(void)
{
printk(BIOS_DEBUG, "Setting up static northbridge registers...");
/* Set up all hardcoded northbridge BARs */
pci_write_config32(HOST_BRIDGE, EPBAR, CONFIG_FIXED_EPBAR_MMIO_BASE | 1);
pci_write_config32(HOST_BRIDGE, EPBAR + 4, 0);
pci_write_config32(HOST_BRIDGE, MCHBAR, CONFIG_FIXED_MCHBAR_MMIO_BASE | 1);
pci_write_config32(HOST_BRIDGE, MCHBAR + 4, 0);
pci_write_config32(HOST_BRIDGE, DMIBAR, CONFIG_FIXED_DMIBAR_MMIO_BASE | 1);
pci_write_config32(HOST_BRIDGE, DMIBAR + 4, 0);
/* Set C0000-FFFFF to access RAM on both reads and writes */
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);
printk(BIOS_DEBUG, " done.\n");
}
static void haswell_setup_igd(void)
{
bool igd_enabled;
u16 ggc;
printk(BIOS_DEBUG, "Initializing IGD...\n");
igd_enabled = !!(pci_read_config32(HOST_BRIDGE, DEVEN) & DEVEN_D2EN);
ggc = pci_read_config16(HOST_BRIDGE, GGC);
ggc &= ~0x3f8;
if (igd_enabled) {
ggc |= GGC_GTT_2MB | GGC_IGD_MEM_IN_32MB_UNITS(1);
ggc &= ~GGC_DISABLE_VGA_IO_DECODE;
} else {
ggc |= GGC_GTT_0MB | GGC_IGD_MEM_IN_32MB_UNITS(0) | GGC_DISABLE_VGA_IO_DECODE;
}
pci_write_config16(HOST_BRIDGE, GGC, ggc);
if (!igd_enabled) {
printk(BIOS_DEBUG, "IGD is disabled.\n");
return;
}
/* Enable 256MB aperture */
pci_update_config8(PCI_DEV(0, 2, 0), MSAC, ~0x06, 0x02);
}
static void start_peg2_link_training(const pci_devfn_t dev)
{
u32 mask;
switch (dev) {
case PCI_DEV(0, 1, 2):
mask = DEVEN_D1F2EN;
break;
case PCI_DEV(0, 1, 1):
mask = DEVEN_D1F1EN;
break;
case PCI_DEV(0, 1, 0):
mask = DEVEN_D1F0EN;
break;
default:
printk(BIOS_ERR, "Link training tried on a non-PEG device!\n");
return;
}
pci_update_config32(dev, 0xc24, ~(1 << 16), 1 << 5);
printk(BIOS_DEBUG, "Started PEG1%d link training.\n", PCI_FUNC(PCI_DEV2DEVFN(dev)));
/*
* The MRC will perform PCI enumeration, and if it detects a VGA
* device in a PEG slot, it will disable the IGD and not reserve
* any memory for it. Since the memory map is locked by the time
* MRC finishes, the IGD can't be enabled afterwards. Wonderful.
*
* If one really wants to enable the Intel iGPU as primary, hide
* all PEG devices during MRC execution. This will trick the MRC
* into thinking there aren't any, and will enable the IGD. Note
* that PEG AFE settings will not be programmed, which may cause
* stability problems at higher PCIe link speeds. The most ideal
* way to fix this problem for good is to implement native init.
*/
if (CONFIG(HASWELL_HIDE_PEG_FROM_MRC)) {
pci_update_config32(HOST_BRIDGE, DEVEN, ~mask, 0);
peg_hidden[PCI_FUNC(PCI_DEV2DEVFN(dev))] = true;
printk(BIOS_DEBUG, "Temporarily hiding PEG1%d.\n",
PCI_FUNC(PCI_DEV2DEVFN(dev)));
}
}
void haswell_unhide_peg(void)
{
u32 deven = pci_read_config32(HOST_BRIDGE, DEVEN);
for (u8 fn = 0; fn <= 2; fn++) {
if (peg_hidden[fn]) {
deven |= DEVEN_D1F0EN >> fn;
peg_hidden[fn] = false;
printk(BIOS_DEBUG, "Unhiding PEG1%d.\n", fn);
}
}
pci_write_config32(HOST_BRIDGE, DEVEN, deven);
}
static void haswell_setup_peg(void)
{
u32 deven = pci_read_config32(HOST_BRIDGE, DEVEN);
if (deven & DEVEN_D1F2EN)
start_peg2_link_training(PCI_DEV(0, 1, 2));
if (deven & DEVEN_D1F1EN)
start_peg2_link_training(PCI_DEV(0, 1, 1));
if (deven & DEVEN_D1F0EN)
start_peg2_link_training(PCI_DEV(0, 1, 0));
}
static void haswell_setup_misc(void)
{
u32 reg32;
/* Erratum workarounds */
reg32 = mchbar_read32(SAPMCTL);
reg32 |= (1 << 9) | (1 << 10);
mchbar_write32(SAPMCTL, reg32);
/* Enable SA Clock Gating */
reg32 = mchbar_read32(SAPMCTL);
mchbar_write32(SAPMCTL, reg32 | 1);
reg32 = mchbar_read32(INTRDIRCTL);
reg32 |= (1 << 4) | (1 << 5);
mchbar_write32(INTRDIRCTL, reg32);
}
static void haswell_setup_iommu(void)
{
const u32 capid0_a = pci_read_config32(HOST_BRIDGE, CAPID0_A);
if (capid0_a & VTD_DISABLE)
return;
/* Setup BARs: zeroize top 32 bits; set enable bit */
mchbar_write32(GFXVTBAR + 4, GFXVT_BASE_ADDRESS >> 32);
mchbar_write32(GFXVTBAR + 0, GFXVT_BASE_ADDRESS | 1);
mchbar_write32(VTVC0BAR + 4, VTVC0_BASE_ADDRESS >> 32);
mchbar_write32(VTVC0BAR + 0, VTVC0_BASE_ADDRESS | 1);
/* Set L3HIT2PEND_DIS, lock GFXVTBAR policy config registers */
u32 reg32;
reg32 = read32((void *)(GFXVT_BASE_ADDRESS + ARCHDIS));
write32((void *)(GFXVT_BASE_ADDRESS + ARCHDIS), reg32 | DMAR_LCKDN | L3HIT2PEND_DIS);
/* Clear SPCAPCTRL */
reg32 = read32((void *)(VTVC0_BASE_ADDRESS + ARCHDIS)) & ~SPCAPCTRL;
/* Set GLBIOTLBINV, GLBCTXTINV; lock VTVC0BAR policy config registers */
write32((void *)(VTVC0_BASE_ADDRESS + ARCHDIS),
reg32 | DMAR_LCKDN | GLBIOTLBINV | GLBCTXTINV);
}
void haswell_early_initialization(void)
{
/* Setup all BARs required for early PCIe and raminit */
haswell_setup_bars();
/* Setup IOMMU BARs */
haswell_setup_iommu();
haswell_setup_peg();
haswell_setup_igd();
haswell_setup_misc();
}
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