1 files changed, 82 insertions, 0 deletions
diff --git a/src/soc/amd/mendocino/early_fch.c b/src/soc/amd/mendocino/early_fch.c
new file mode 100644
index 0000000000..dceeade0e3
--- /dev/null
+++ b/src/soc/amd/mendocino/early_fch.c
@@ -0,0 +1,82 @@
+/* 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_mendocino_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.
+	   TODO(b/241426419): Setup eSPI if it is not already done in verstage on PSP. */
+	if (CONFIG(SOC_AMD_COMMON_BLOCK_USE_ESPI))
+		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();
+}