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/* SPDX-License-Identifier: GPL-2.0-only */
#include <device/mmio.h>
#include <device/pci_ops.h>
#include <device/pci_def.h>
#include <soc/iomap.h>
#include <soc/pci_devs.h>
#include <soc/romstage.h>
#include <soc/systemagent.h>
static void broadwell_setup_bars(void)
{
/* Set up all hardcoded northbridge BARs */
pci_write_config32(HOST_BRIDGE, MCHBAR, CONFIG_FIXED_MCHBAR_MMIO_BASE | 1);
pci_write_config32(HOST_BRIDGE, DMIBAR, CONFIG_FIXED_DMIBAR_MMIO_BASE | 1);
pci_write_config32(HOST_BRIDGE, EPBAR, CONFIG_FIXED_EPBAR_MMIO_BASE | 1);
mchbar_write32(EDRAMBAR, EDRAM_BASE_ADDRESS | 1);
mchbar_write32(GDXCBAR, GDXC_BASE_ADDRESS | 1);
/* 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);
}
void systemagent_early_init(void)
{
const bool vtd_capable =
!(pci_read_config32(HOST_BRIDGE, CAPID0_A) & VTD_DISABLE);
broadwell_setup_bars();
/* Device enable: IGD and Mini-HD */
pci_write_config32(HOST_BRIDGE, DEVEN, DEVEN_D0EN | DEVEN_D2EN | DEVEN_D3EN);
if (vtd_capable) {
/* 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 PRSCAPDIS, lock GFXVTBAR policy cfg registers */
u32 reg32;
reg32 = read32p(GFXVT_BASE_ADDRESS + ARCHDIS);
write32p(GFXVT_BASE_ADDRESS + ARCHDIS,
reg32 | DMAR_LCKDN | PRSCAPDIS);
/* lock VTVC0BAR policy cfg registers */
reg32 = read32p(VTVC0_BASE_ADDRESS + ARCHDIS);
write32p(VTVC0_BASE_ADDRESS + ARCHDIS,
reg32 | DMAR_LCKDN);
}
}
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