early_fch.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
/* TODO: Check if this is still correct */
 
#include <amdblocks/acpimmio.h>
#include <amdblocks/espi.h>
#include <amdblocks/i2c.h>
#include <amdblocks/lpc.h>
#include <amdblocks/pmlib.h>
#include <amdblocks/smbus.h>
#include <soc/i2c.h>
#include <soc/southbridge.h>
#include <soc/uart.h>
 
#include "chip.h"
 
/* Table to switch SCL pins to outputs to initially reset the I2C peripherals */
static const struct soc_i2c_scl_pin i2c_scl_pins[] = {
        I2C_RESET_SCL_PIN(I2C0_SCL_PIN, GPIO_I2C0_SCL),
        I2C_RESET_SCL_PIN(I2C1_SCL_PIN, GPIO_I2C1_SCL),
        I2C_RESET_SCL_PIN(I2C2_SCL_PIN, GPIO_I2C2_SCL),
        I2C_RESET_SCL_PIN(I2C3_SCL_PIN, GPIO_I2C3_SCL),
};
 
static void reset_i2c_peripherals(void)
{
        const struct soc_amd_sabrina_config *cfg = config_of_soc();
        struct soc_i2c_peripheral_reset_info reset_info;
 
        reset_info.i2c_scl_reset_mask = cfg->i2c_scl_reset & GPIO_I2C_MASK;
        reset_info.i2c_scl = i2c_scl_pins;
        reset_info.num_pins = ARRAY_SIZE(i2c_scl_pins);
        sb_reset_i2c_peripherals(&reset_info);
}
 
/* Before console init */
void fch_pre_init(void)
{
        /* Enable_acpimmio_decode_pm04 to enable the ACPIMMIO decode which is needed to access
           the GPIO registers. */
        enable_acpimmio_decode_pm04();
        /* Setup SPI base by calling lpc_early_init before setting up eSPI. */
        lpc_early_init();
 
        /* Setup eSPI to enable port80 routing if the board is using eSPI and the eSPI
           interface hasn't already been set up in verstage on PSP */
        if (CONFIG(SOC_AMD_COMMON_BLOCK_USE_ESPI) && !CONFIG(VBOOT_STARTS_BEFORE_BOOTBLOCK))
                configure_espi_with_mb_hook();
 
        fch_spi_early_init();
        fch_smbus_init();
        fch_enable_cf9_io();
        fch_enable_legacy_io();
        fch_disable_legacy_dma_io();
        enable_aoac_devices();
        reset_i2c_peripherals();
 
        /*
         * On reset Range_0 defaults to enabled. We want to start with a clean
         * slate to not have things unexpectedly enabled.
         */
        clear_uart_legacy_config();
 
        if (CONFIG(AMD_SOC_CONSOLE_UART))
                set_uart_config(CONFIG_UART_FOR_CONSOLE);
 
        /* disable the keyboard reset function before mainboard GPIO setup */
        if (CONFIG(DISABLE_KEYBOARD_RESET_PIN))
                fch_disable_kb_rst();
}
 
/* After console init */
void fch_early_init(void)
{
        pm_set_power_failure_state();
        fch_print_pmxc0_status();
        i2c_soc_early_init();
        show_spi_speeds_and_modes();
 
        if (CONFIG(DISABLE_SPI_FLASH_ROM_SHARING))
                lpc_disable_spi_rom_sharing();
}