northbridge.c
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/*
* From Coreboot northbridge/intel/sandybridge/northbridge.c
*
* Copyright (C) 2007-2009 coresystems GmbH
* Copyright (C) 2011 The Chromium Authors
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <asm/msr.h>
#include <asm/acpi.h>
#include <asm/cpu.h>
#include <asm/io.h>
#include <asm/pci.h>
#include <asm/processor.h>
#include <asm/arch/pch.h>
#include <asm/arch/model_206ax.h>
#include <asm/arch/sandybridge.h>
static int bridge_revision_id = -1;
int bridge_silicon_revision(void)
{
if (bridge_revision_id < 0) {
struct cpuid_result result;
uint8_t stepping, bridge_id;
pci_dev_t dev;
result = cpuid(1);
stepping = result.eax & 0xf;
dev = PCI_BDF(0, 0, 0);
bridge_id = x86_pci_read_config16(dev, PCI_DEVICE_ID) & 0xf0;
bridge_revision_id = bridge_id | stepping;
}
return bridge_revision_id;
}
/*
* Reserve everything between A segment and 1MB:
*
* 0xa0000 - 0xbffff: legacy VGA
* 0xc0000 - 0xcffff: VGA OPROM (needed by kernel)
* 0xe0000 - 0xfffff: SeaBIOS, if used, otherwise DMI
*/
static const int legacy_hole_base_k = 0xa0000 / 1024;
static const int legacy_hole_size_k = 384;
static int get_pcie_bar(u32 *base, u32 *len)
{
pci_dev_t dev = PCI_BDF(0, 0, 0);
u32 pciexbar_reg;
*base = 0;
*len = 0;
pciexbar_reg = x86_pci_read_config32(dev, PCIEXBAR);
if (!(pciexbar_reg & (1 << 0)))
return 0;
switch ((pciexbar_reg >> 1) & 3) {
case 0: /* 256MB */
*base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
(1 << 28));
*len = 256 * 1024 * 1024;
return 1;
case 1: /* 128M */
*base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
(1 << 28) | (1 << 27));
*len = 128 * 1024 * 1024;
return 1;
case 2: /* 64M */
*base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
(1 << 28) | (1 << 27) | (1 << 26));
*len = 64 * 1024 * 1024;
return 1;
}
return 0;
}
static void add_fixed_resources(pci_dev_t dev, int index)
{
u32 pcie_config_base, pcie_config_size;
if (get_pcie_bar(&pcie_config_base, &pcie_config_size)) {
debug("Adding PCIe config bar base=0x%08x size=0x%x\n",
pcie_config_base, pcie_config_size);
}
}
static void northbridge_dmi_init(pci_dev_t dev)
{
/* Clear error status bits */
writel(0xffffffff, DMIBAR_REG(0x1c4));
writel(0xffffffff, DMIBAR_REG(0x1d0));
/* Steps prior to DMI ASPM */
if ((bridge_silicon_revision() & BASE_REV_MASK) == BASE_REV_SNB) {
clrsetbits_le32(DMIBAR_REG(0x250), (1 << 22) | (1 << 20),
1 << 21);
}
setbits_le32(DMIBAR_REG(0x238), 1 << 29);
if (bridge_silicon_revision() >= SNB_STEP_D0) {
setbits_le32(DMIBAR_REG(0x1f8), 1 << 16);
} else if (bridge_silicon_revision() >= SNB_STEP_D1) {
clrsetbits_le32(DMIBAR_REG(0x1f8), 1 << 26, 1 << 16);
setbits_le32(DMIBAR_REG(0x1fc), (1 << 12) | (1 << 23));
}
/* Enable ASPM on SNB link, should happen before PCH link */
if ((bridge_silicon_revision() & BASE_REV_MASK) == BASE_REV_SNB)
setbits_le32(DMIBAR_REG(0xd04), 1 << 4);
setbits_le32(DMIBAR_REG(0x88), (1 << 1) | (1 << 0));
}
void northbridge_init(pci_dev_t dev)
{
u32 bridge_type;
add_fixed_resources(dev, 6);
northbridge_dmi_init(dev);
bridge_type = readl(MCHBAR_REG(0x5f10));
bridge_type &= ~0xff;
if ((bridge_silicon_revision() & BASE_REV_MASK) == BASE_REV_IVB) {
/* Enable Power Aware Interrupt Routing - fixed priority */
clrsetbits_8(MCHBAR_REG(0x5418), 0xf, 0x4);
/* 30h for IvyBridge */
bridge_type |= 0x30;
} else {
/* 20h for Sandybridge */
bridge_type |= 0x20;
}
writel(bridge_type, MCHBAR_REG(0x5f10));
/*
* Set bit 0 of BIOS_RESET_CPL to indicate to the CPU
* that BIOS has initialized memory and power management
*/
setbits_8(MCHBAR_REG(BIOS_RESET_CPL), 1);
debug("Set BIOS_RESET_CPL\n");
/* Configure turbo power limits 1ms after reset complete bit */
mdelay(1);
set_power_limits(28);
/*
* CPUs with configurable TDP also need power limits set
* in MCHBAR. Use same values from MSR_PKG_POWER_LIMIT.
*/
if (cpu_config_tdp_levels()) {
msr_t msr = msr_read(MSR_PKG_POWER_LIMIT);
writel(msr.lo, MCHBAR_REG(0x59A0));
writel(msr.hi, MCHBAR_REG(0x59A4));
}
/* Set here before graphics PM init */
writel(0x00100001, MCHBAR_REG(0x5500));
}
void northbridge_enable(pci_dev_t dev)
{
#if CONFIG_HAVE_ACPI_RESUME
switch (x86_pci_read_config32(dev, SKPAD)) {
case 0xcafebabe:
debug("Normal boot.\n");
apci_set_slp_type(0);
break;
case 0xcafed00d:
debug("S3 Resume.\n");
apci_set_slp_type(3);
break;
default:
debug("Unknown boot method, assuming normal.\n");
apci_set_slp_type(0);
break;
}
#endif
}