| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2017 Intel Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <arch/io.h> |
| #include <delay.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <intelblocks/systemagent.h> |
| #include <soc/iomap.h> |
| #include <soc/pci_devs.h> |
| #include <soc/systemagent.h> |
| #include "systemagent_def.h" |
| #include <timer.h> |
| |
| #if !ENV_RAMSTAGE |
| void bootblock_systemagent_early_init(void) |
| { |
| uint32_t reg; |
| uint8_t pciexbar_length; |
| |
| /* |
| * The PCIEXBAR is assumed to live in the memory mapped IO space under |
| * 4GiB. |
| */ |
| reg = 0; |
| pci_io_write_config32(SA_DEV_ROOT, PCIEXBAR + 4, reg); |
| |
| /* Get PCI Express Region Length */ |
| switch (CONFIG_SA_PCIEX_LENGTH) { |
| case 256 * MiB: |
| pciexbar_length = PCIEXBAR_LENGTH_256MB; |
| break; |
| case 128 * MiB: |
| pciexbar_length = PCIEXBAR_LENGTH_128MB; |
| break; |
| case 64 * MiB: |
| pciexbar_length = PCIEXBAR_LENGTH_64MB; |
| break; |
| default: |
| pciexbar_length = PCIEXBAR_LENGTH_256MB; |
| } |
| reg = CONFIG_MMCONF_BASE_ADDRESS | (pciexbar_length << 1) |
| | PCIEXBAR_PCIEXBAREN; |
| pci_io_write_config32(SA_DEV_ROOT, PCIEXBAR, reg); |
| |
| /* |
| * TSEG defines the base of SMM range. BIOS determines the base |
| * of TSEG memory which must be at or below Graphics base of GTT |
| * Stolen memory, hence its better to clear TSEG register early |
| * to avoid power on default non-zero value (if any). |
| */ |
| pci_write_config32(SA_DEV_ROOT, TSEG, 0); |
| } |
| #endif |
| |
| void sa_set_pci_bar(const struct sa_mmio_descriptor *fixed_set_resources, |
| size_t count) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++) { |
| uintptr_t base; |
| unsigned int index; |
| |
| index = fixed_set_resources[i].index; |
| /* Check if PCI BAR already enabled */ |
| base = pci_read_config32(SA_DEV_ROOT, index); |
| |
| /* If enabled don't program it. */ |
| if (base & 0x1) |
| return; |
| |
| base = fixed_set_resources[i].base; |
| |
| pci_write_config32(SA_DEV_ROOT, index, base | 1); |
| } |
| } |
| |
| /* |
| * There are special BARs that actually are programmed in the MCHBAR. These |
| * Intel special features, but they do consume resources that need to be |
| * accounted for. |
| */ |
| void sa_set_mch_bar(const struct sa_mmio_descriptor *fixed_set_resources, |
| size_t count) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++) { |
| uintptr_t base; |
| unsigned int index; |
| |
| base = fixed_set_resources[i].base; |
| index = fixed_set_resources[i].index; |
| write32((void *)(MCH_BASE_ADDRESS + index), base | 1); |
| } |
| } |
| |
| void enable_pam_region(void) |
| { |
| /* All read and writes in this region are serviced by DRAM */ |
| pci_write_config8(SA_DEV_ROOT, PAM0, 0x30); |
| pci_write_config8(SA_DEV_ROOT, PAM1, 0x33); |
| pci_write_config8(SA_DEV_ROOT, PAM2, 0x33); |
| pci_write_config8(SA_DEV_ROOT, PAM3, 0x33); |
| pci_write_config8(SA_DEV_ROOT, PAM4, 0x33); |
| pci_write_config8(SA_DEV_ROOT, PAM5, 0x33); |
| pci_write_config8(SA_DEV_ROOT, PAM6, 0x33); |
| } |
| |
| void enable_bios_reset_cpl(void) |
| { |
| u8 bios_reset_cpl; |
| |
| /* |
| * Set bits 0+1 of BIOS_RESET_CPL to indicate to the CPU |
| * that BIOS has initialized memory and power management |
| */ |
| bios_reset_cpl = MCHBAR8(BIOS_RESET_CPL); |
| bios_reset_cpl |= 3; |
| MCHBAR8(BIOS_RESET_CPL) = bios_reset_cpl; |
| } |