262 lines
6.6 KiB
C
262 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* From Coreboot northbridge/intel/sandybridge/northbridge.c
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*
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* Copyright (C) 2007-2009 coresystems GmbH
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* Copyright (C) 2011 The Chromium Authors
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*/
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#include <common.h>
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#include <dm.h>
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#include <asm/msr.h>
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#include <asm/cpu.h>
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#include <asm/intel_regs.h>
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#include <asm/io.h>
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#include <asm/pci.h>
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#include <asm/processor.h>
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#include <asm/arch/pch.h>
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#include <asm/arch/model_206ax.h>
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#include <asm/arch/sandybridge.h>
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DECLARE_GLOBAL_DATA_PTR;
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int bridge_silicon_revision(struct udevice *dev)
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{
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struct cpuid_result result;
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u16 bridge_id;
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u8 stepping;
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result = cpuid(1);
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stepping = result.eax & 0xf;
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dm_pci_read_config16(dev, PCI_DEVICE_ID, &bridge_id);
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bridge_id &= 0xf0;
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return bridge_id | stepping;
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}
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static int get_pcie_bar(struct udevice *dev, u32 *base, u32 *len)
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{
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u32 pciexbar_reg;
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*base = 0;
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*len = 0;
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dm_pci_read_config32(dev, PCIEXBAR, &pciexbar_reg);
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if (!(pciexbar_reg & (1 << 0)))
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return 0;
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switch ((pciexbar_reg >> 1) & 3) {
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case 0: /* 256MB */
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*base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
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(1 << 28));
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*len = 256 * 1024 * 1024;
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return 1;
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case 1: /* 128M */
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*base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
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(1 << 28) | (1 << 27));
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*len = 128 * 1024 * 1024;
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return 1;
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case 2: /* 64M */
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*base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
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(1 << 28) | (1 << 27) | (1 << 26));
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*len = 64 * 1024 * 1024;
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return 1;
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}
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return 0;
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}
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static void add_fixed_resources(struct udevice *dev, int index)
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{
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u32 pcie_config_base, pcie_config_size;
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if (get_pcie_bar(dev, &pcie_config_base, &pcie_config_size)) {
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debug("Adding PCIe config bar base=0x%08x size=0x%x\n",
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pcie_config_base, pcie_config_size);
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}
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}
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static void northbridge_dmi_init(struct udevice *dev, int rev)
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{
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/* Clear error status bits */
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writel(0xffffffff, DMIBAR_REG(0x1c4));
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writel(0xffffffff, DMIBAR_REG(0x1d0));
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/* Steps prior to DMI ASPM */
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if ((rev & BASE_REV_MASK) == BASE_REV_SNB) {
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clrsetbits_le32(DMIBAR_REG(0x250), (1 << 22) | (1 << 20),
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1 << 21);
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}
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setbits_le32(DMIBAR_REG(0x238), 1 << 29);
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if (rev >= SNB_STEP_D0) {
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setbits_le32(DMIBAR_REG(0x1f8), 1 << 16);
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} else if (rev >= SNB_STEP_D1) {
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clrsetbits_le32(DMIBAR_REG(0x1f8), 1 << 26, 1 << 16);
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setbits_le32(DMIBAR_REG(0x1fc), (1 << 12) | (1 << 23));
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}
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/* Enable ASPM on SNB link, should happen before PCH link */
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if ((rev & BASE_REV_MASK) == BASE_REV_SNB)
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setbits_le32(DMIBAR_REG(0xd04), 1 << 4);
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setbits_le32(DMIBAR_REG(0x88), (1 << 1) | (1 << 0));
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}
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static void northbridge_init(struct udevice *dev, int rev)
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{
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u32 bridge_type;
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add_fixed_resources(dev, 6);
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northbridge_dmi_init(dev, rev);
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bridge_type = readl(MCHBAR_REG(0x5f10));
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bridge_type &= ~0xff;
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if ((rev & BASE_REV_MASK) == BASE_REV_IVB) {
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/* Enable Power Aware Interrupt Routing - fixed priority */
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clrsetbits_8(MCHBAR_REG(0x5418), 0xf, 0x4);
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/* 30h for IvyBridge */
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bridge_type |= 0x30;
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} else {
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/* 20h for Sandybridge */
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bridge_type |= 0x20;
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}
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writel(bridge_type, MCHBAR_REG(0x5f10));
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/*
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* Set bit 0 of BIOS_RESET_CPL to indicate to the CPU
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* that BIOS has initialized memory and power management
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*/
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setbits_8(MCHBAR_REG(BIOS_RESET_CPL), 1);
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debug("Set BIOS_RESET_CPL\n");
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/* Configure turbo power limits 1ms after reset complete bit */
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mdelay(1);
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set_power_limits(28);
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/*
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* CPUs with configurable TDP also need power limits set
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* in MCHBAR. Use same values from MSR_PKG_POWER_LIMIT.
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*/
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if (cpu_config_tdp_levels()) {
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msr_t msr = msr_read(MSR_PKG_POWER_LIMIT);
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writel(msr.lo, MCHBAR_REG(0x59A0));
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writel(msr.hi, MCHBAR_REG(0x59A4));
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}
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/* Set here before graphics PM init */
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writel(0x00100001, MCHBAR_REG(0x5500));
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}
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static void sandybridge_setup_northbridge_bars(struct udevice *dev)
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{
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/* Set up all hardcoded northbridge BARs */
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debug("Setting up static registers\n");
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dm_pci_write_config32(dev, EPBAR, DEFAULT_EPBAR | 1);
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dm_pci_write_config32(dev, EPBAR + 4, (0LL + DEFAULT_EPBAR) >> 32);
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dm_pci_write_config32(dev, MCHBAR, MCH_BASE_ADDRESS | 1);
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dm_pci_write_config32(dev, MCHBAR + 4, (0LL + MCH_BASE_ADDRESS) >> 32);
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/* 64MB - busses 0-63 */
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dm_pci_write_config32(dev, PCIEXBAR, DEFAULT_PCIEXBAR | 5);
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dm_pci_write_config32(dev, PCIEXBAR + 4,
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(0LL + DEFAULT_PCIEXBAR) >> 32);
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dm_pci_write_config32(dev, DMIBAR, DEFAULT_DMIBAR | 1);
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dm_pci_write_config32(dev, DMIBAR + 4, (0LL + DEFAULT_DMIBAR) >> 32);
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/* Set C0000-FFFFF to access RAM on both reads and writes */
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dm_pci_write_config8(dev, PAM0, 0x30);
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dm_pci_write_config8(dev, PAM1, 0x33);
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dm_pci_write_config8(dev, PAM2, 0x33);
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dm_pci_write_config8(dev, PAM3, 0x33);
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dm_pci_write_config8(dev, PAM4, 0x33);
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dm_pci_write_config8(dev, PAM5, 0x33);
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dm_pci_write_config8(dev, PAM6, 0x33);
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}
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/**
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* sandybridge_init_iommu() - Set up IOMMU so that azalia can be used
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*
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* It is not obvious where these values come from. They may be undocumented.
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*/
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static void sandybridge_init_iommu(struct udevice *dev)
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{
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u32 capid0_a;
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dm_pci_read_config32(dev, 0xe4, &capid0_a);
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if (capid0_a & (1 << 23)) {
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log_debug("capid0_a not needed\n");
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return;
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}
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/* setup BARs */
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writel(IOMMU_BASE1 >> 32, MCHBAR_REG(0x5404));
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writel(IOMMU_BASE1 | 1, MCHBAR_REG(0x5400));
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writel(IOMMU_BASE2 >> 32, MCHBAR_REG(0x5414));
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writel(IOMMU_BASE2 | 1, MCHBAR_REG(0x5410));
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/* lock policies */
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writel(0x80000000, IOMMU_BASE1 + 0xff0);
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/* Enable azalia sound */
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writel(0x20000000, IOMMU_BASE2 + 0xff0);
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writel(0xa0000000, IOMMU_BASE2 + 0xff0);
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}
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static int bd82x6x_northbridge_early_init(struct udevice *dev)
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{
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const int chipset_type = SANDYBRIDGE_MOBILE;
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u32 capid0_a;
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u8 reg8;
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/* Device ID Override Enable should be done very early */
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dm_pci_read_config32(dev, 0xe4, &capid0_a);
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if (capid0_a & (1 << 10)) {
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dm_pci_read_config8(dev, 0xf3, ®8);
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reg8 &= ~7; /* Clear 2:0 */
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if (chipset_type == SANDYBRIDGE_MOBILE)
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reg8 |= 1; /* Set bit 0 */
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dm_pci_write_config8(dev, 0xf3, reg8);
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}
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sandybridge_setup_northbridge_bars(dev);
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/* Setup IOMMU BARs */
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sandybridge_init_iommu(dev);
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/* Device Enable */
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dm_pci_write_config32(dev, DEVEN, DEVEN_HOST | DEVEN_IGD);
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return 0;
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}
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static int bd82x6x_northbridge_probe(struct udevice *dev)
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{
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int rev;
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if (!(gd->flags & GD_FLG_RELOC))
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return bd82x6x_northbridge_early_init(dev);
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rev = bridge_silicon_revision(dev);
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northbridge_init(dev, rev);
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return 0;
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}
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static const struct udevice_id bd82x6x_northbridge_ids[] = {
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{ .compatible = "intel,bd82x6x-northbridge" },
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{ }
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};
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U_BOOT_DRIVER(bd82x6x_northbridge_drv) = {
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.name = "bd82x6x_northbridge",
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.id = UCLASS_NORTHBRIDGE,
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.of_match = bd82x6x_northbridge_ids,
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.probe = bd82x6x_northbridge_probe,
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};
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