src/soc/intel/apollolake/bootblock/bootblock.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2016 Intel Corp.
 * (Written by Andrey Petrov <andrey.petrov@intel.com> for Intel Corp.)
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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/cpu.h>
#include <bootblock_common.h>
#include <cpu/x86/mtrr.h>
#include <device/pci.h>
#include <intelblocks/pcr.h>
#include <intelblocks/systemagent.h>
#include <intelblocks/rtc.h>
#include <lib.h>
#include <soc/iomap.h>
#include <soc/cpu.h>
#include <soc/flash_ctrlr.h>
#include <soc/gpio.h>
#include <soc/mmap_boot.h>
#include <soc/systemagent.h>
#include <soc/pci_devs.h>
#include <soc/pm.h>
#include <soc/uart.h>
#include <spi-generic.h>
#include <timestamp.h>

static const struct pad_config tpm_spi_configs[] = {
	PAD_CFG_NF(GPIO_106, NATIVE, DEEP, NF3),	/* FST_SPI_CS2_N */
};

static void tpm_enable(void)
{
	/* Configure gpios */
	gpio_configure_pads(tpm_spi_configs, ARRAY_SIZE(tpm_spi_configs));
}

asmlinkage void bootblock_c_entry(uint64_t base_timestamp)
{
	device_t dev;

	bootblock_systemagent_early_init();

	dev = PCH_DEV_P2SB;
	/* BAR and MMIO enable for PCR-Space, so that GPIOs can be configured */
	pci_write_config32(dev, PCI_BASE_ADDRESS_0, CONFIG_PCR_BASE_ADDRESS);
	pci_write_config32(dev, PCI_BASE_ADDRESS_1, 0);
	pci_write_config16(dev, PCI_COMMAND,
				PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);

	/* Decode the ACPI I/O port range for early firmware verification.*/
	dev = PCH_DEV_PMC;
	pci_write_config16(dev, PCI_BASE_ADDRESS_4, ACPI_PMIO_BASE);
	pci_write_config16(dev, PCI_COMMAND,
				PCI_COMMAND_IO | PCI_COMMAND_MASTER);

	enable_rtc_upper_bank();

	/* Call lib/bootblock.c main */
	bootblock_main_with_timestamp(base_timestamp);
}

static void cache_bios_region(void)
{
	int mtrr;
	size_t rom_size;
	uint32_t alignment;

	mtrr = get_free_var_mtrr();

	if (mtrr == -1)
		return;

	/* Only the IFD BIOS region is memory mapped (at top of 4G) */
	rom_size = get_bios_size();

	if (!rom_size)
		return;

	/* Round to power of two */
	alignment = 1 << (log2_ceil(rom_size));
	rom_size = ALIGN_UP(rom_size, alignment);
	set_var_mtrr(mtrr, 4ULL*GiB - rom_size, rom_size, MTRR_TYPE_WRPROT);
}

/*
 * Program temporary BAR for SPI in case any of the stages before ramstage need
 * to access SPI MMIO regs. Ramstage will assign a new BAR during PCI
 * enumeration.
 */
static void enable_spibar(void)
{
	device_t dev = PCH_DEV_SPI;
	uint8_t val;

	/* Disable Bus Master and MMIO space. */
	val = pci_read_config8(dev, PCI_COMMAND);
	val &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
	pci_write_config8(dev, PCI_COMMAND, val);

	/* Program Temporary BAR for SPI */
	pci_write_config32(dev, PCI_BASE_ADDRESS_0,
			   PRERAM_SPI_BASE_ADDRESS |
			   PCI_BASE_ADDRESS_SPACE_MEMORY);

	/* Enable Bus Master and MMIO Space */
	val = pci_read_config8(dev, PCI_COMMAND);
	val |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
	pci_write_config8(dev, PCI_COMMAND, val);

	/* Initialize SPI to allow BIOS to write/erase on flash. */
	spi_flash_init();
}

static void enable_pmcbar(void)
{
	device_t pmc = PCH_DEV_PMC;

	/* Set PMC base addresses and enable decoding. */
	pci_write_config32(pmc, PCI_BASE_ADDRESS_0, PMC_BAR0);
	pci_write_config32(pmc, PCI_BASE_ADDRESS_1, 0);	/* 64-bit BAR */
	pci_write_config32(pmc, PCI_BASE_ADDRESS_2, PMC_BAR1);
	pci_write_config32(pmc, PCI_BASE_ADDRESS_3, 0);	/* 64-bit BAR */
	pci_write_config16(pmc, PCI_BASE_ADDRESS_4, ACPI_PMIO_BASE);
	pci_write_config16(pmc, PCI_COMMAND,
				PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
				PCI_COMMAND_MASTER);
}

void bootblock_soc_early_init(void)
{
	enable_pmcbar();

	/* Clear global reset promotion bit */
	global_reset_enable(0);

	/* Prepare UART for serial console. */
	if (IS_ENABLED(CONFIG_SOC_UART_DEBUG))
		pch_uart_init();

	if (IS_ENABLED(CONFIG_TPM_ON_FAST_SPI))
		tpm_enable();

	enable_pm_timer_emulation();

	enable_spibar();

	cache_bios_region();

	/* Initialize GPE for use as interrupt status */
	pmc_gpe_init();
}