/* * 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 #include #include #include #include #include #include #include #include #include #include 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) { } 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, DEFAULT_MCHBAR | 1); dm_pci_write_config32(dev, MCHBAR + 4, (0LL + DEFAULT_MCHBAR) >> 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); } static int bd82x6x_northbridge_probe(struct udevice *dev) { const int chipset_type = SANDYBRIDGE_MOBILE; u32 capid0_a; u8 reg8; if (gd->flags & GD_FLG_RELOC) return 0; /* 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); /* Device Enable */ dm_pci_write_config32(dev, DEVEN, DEVEN_HOST | DEVEN_IGD); 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, };