diff options
Diffstat (limited to 'roms/u-boot/arch/x86/cpu/ivybridge/northbridge.c')
| -rw-r--r-- | roms/u-boot/arch/x86/cpu/ivybridge/northbridge.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/roms/u-boot/arch/x86/cpu/ivybridge/northbridge.c b/roms/u-boot/arch/x86/cpu/ivybridge/northbridge.c new file mode 100644 index 000000000..994f8a4ff --- /dev/null +++ b/roms/u-boot/arch/x86/cpu/ivybridge/northbridge.c @@ -0,0 +1,264 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * From Coreboot northbridge/intel/sandybridge/northbridge.c + * + * Copyright (C) 2007-2009 coresystems GmbH + * Copyright (C) 2011 The Chromium Authors + */ + +#include <common.h> +#include <dm.h> +#include <log.h> +#include <asm/global_data.h> +#include <asm/msr.h> +#include <asm/cpu.h> +#include <asm/intel_regs.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> +#include <linux/delay.h> + +DECLARE_GLOBAL_DATA_PTR; + +int bridge_silicon_revision(struct udevice *dev) +{ + struct cpuid_result result; + u16 bridge_id; + u8 stepping; + + result = cpuid(1); + stepping = result.eax & 0xf; + dm_pci_read_config16(dev, PCI_DEVICE_ID, &bridge_id); + bridge_id &= 0xf0; + return bridge_id | stepping; +} + +static int get_pcie_bar(struct udevice *dev, u32 *base, u32 *len) +{ + u32 pciexbar_reg; + + *base = 0; + *len = 0; + + dm_pci_read_config32(dev, PCIEXBAR, &pciexbar_reg); + + 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(struct udevice *dev, int index) +{ + u32 pcie_config_base, pcie_config_size; + + if (get_pcie_bar(dev, &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(struct udevice *dev, int rev) +{ + /* Clear error status bits */ + writel(0xffffffff, DMIBAR_REG(0x1c4)); + writel(0xffffffff, DMIBAR_REG(0x1d0)); + + /* Steps prior to DMI ASPM */ + if ((rev & 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 (rev >= SNB_STEP_D0) { + setbits_le32(DMIBAR_REG(0x1f8), 1 << 16); + } else if (rev >= 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 ((rev & BASE_REV_MASK) == BASE_REV_SNB) + setbits_le32(DMIBAR_REG(0xd04), 1 << 4); + + setbits_le32(DMIBAR_REG(0x88), (1 << 1) | (1 << 0)); +} + +static void northbridge_init(struct udevice *dev, int rev) +{ + u32 bridge_type; + + add_fixed_resources(dev, 6); + northbridge_dmi_init(dev, rev); + + bridge_type = readl(MCHBAR_REG(0x5f10)); + bridge_type &= ~0xff; + + if ((rev & 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_ivybridge_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)); +} + +static void sandybridge_setup_northbridge_bars(struct udevice *dev) +{ + /* Set up all hardcoded northbridge BARs */ + debug("Setting up static registers\n"); + dm_pci_write_config32(dev, EPBAR, DEFAULT_EPBAR | 1); + dm_pci_write_config32(dev, EPBAR + 4, (0LL + DEFAULT_EPBAR) >> 32); + dm_pci_write_config32(dev, MCHBAR, MCH_BASE_ADDRESS | 1); + dm_pci_write_config32(dev, MCHBAR + 4, (0LL + MCH_BASE_ADDRESS) >> 32); + /* 64MB - busses 0-63 */ + dm_pci_write_config32(dev, PCIEXBAR, DEFAULT_PCIEXBAR | 5); + dm_pci_write_config32(dev, PCIEXBAR + 4, + (0LL + DEFAULT_PCIEXBAR) >> 32); + dm_pci_write_config32(dev, DMIBAR, DEFAULT_DMIBAR | 1); + dm_pci_write_config32(dev, DMIBAR + 4, (0LL + DEFAULT_DMIBAR) >> 32); + + /* Set C0000-FFFFF to access RAM on both reads and writes */ + dm_pci_write_config8(dev, PAM0, 0x30); + dm_pci_write_config8(dev, PAM1, 0x33); + dm_pci_write_config8(dev, PAM2, 0x33); + dm_pci_write_config8(dev, PAM3, 0x33); + dm_pci_write_config8(dev, PAM4, 0x33); + dm_pci_write_config8(dev, PAM5, 0x33); + dm_pci_write_config8(dev, PAM6, 0x33); +} + +/** + * sandybridge_init_iommu() - Set up IOMMU so that azalia can be used + * + * It is not obvious where these values come from. They may be undocumented. + */ +static void sandybridge_init_iommu(struct udevice *dev) +{ + u32 capid0_a; + + dm_pci_read_config32(dev, 0xe4, &capid0_a); + if (capid0_a & (1 << 23)) { + log_debug("capid0_a not needed\n"); + return; + } + + /* setup BARs */ + writel(IOMMU_BASE1 >> 32, MCHBAR_REG(0x5404)); + writel(IOMMU_BASE1 | 1, MCHBAR_REG(0x5400)); + writel(IOMMU_BASE2 >> 32, MCHBAR_REG(0x5414)); + writel(IOMMU_BASE2 | 1, MCHBAR_REG(0x5410)); + + /* lock policies */ + writel(0x80000000, IOMMU_BASE1 + 0xff0); + + /* Enable azalia sound */ + writel(0x20000000, IOMMU_BASE2 + 0xff0); + writel(0xa0000000, IOMMU_BASE2 + 0xff0); +} + +static int bd82x6x_northbridge_early_init(struct udevice *dev) +{ + const int chipset_type = SANDYBRIDGE_MOBILE; + u32 capid0_a; + u8 reg8; + + /* Device ID Override Enable should be done very early */ + dm_pci_read_config32(dev, 0xe4, &capid0_a); + if (capid0_a & (1 << 10)) { + dm_pci_read_config8(dev, 0xf3, ®8); + reg8 &= ~7; /* Clear 2:0 */ + + if (chipset_type == SANDYBRIDGE_MOBILE) + reg8 |= 1; /* Set bit 0 */ + + dm_pci_write_config8(dev, 0xf3, reg8); + } + + sandybridge_setup_northbridge_bars(dev); + + /* Setup IOMMU BARs */ + sandybridge_init_iommu(dev); + + /* Device Enable */ + dm_pci_write_config32(dev, DEVEN, DEVEN_HOST | DEVEN_IGD); + + return 0; +} + +static int bd82x6x_northbridge_probe(struct udevice *dev) +{ + int rev; + + if (!(gd->flags & GD_FLG_RELOC)) + return bd82x6x_northbridge_early_init(dev); + + rev = bridge_silicon_revision(dev); + northbridge_init(dev, rev); + + return 0; +} + +static const struct udevice_id bd82x6x_northbridge_ids[] = { + { .compatible = "intel,bd82x6x-northbridge" }, + { } +}; + +U_BOOT_DRIVER(bd82x6x_northbridge_drv) = { + .name = "bd82x6x_northbridge", + .id = UCLASS_NORTHBRIDGE, + .of_match = bd82x6x_northbridge_ids, + .probe = bd82x6x_northbridge_probe, +}; |