mb/google/skyrim: Add eSPI configuration

BUG=b:214413613
TEST=builds

Signed-off-by: Jon Murphy <jpmurphy@google.com>
Change-Id: If1177dda705738222ce7f6f42dceafb14d37c98c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62162
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/mainboard/google/skyrim/Kconfig

@@ -27,6 +27,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select FW_CONFIG
 	select MAINBOARD_HAS_CHROMEOS
 	select SOC_AMD_SABRINA
+	select SOC_AMD_COMMON_BLOCK_USE_ESPI
 
 config CHROMEOS
 	select EC_GOOGLE_CHROMEEC_SWITCHES

src/mainboard/google/skyrim/variants/baseboard/devicetree.cb

@@ -1,5 +1,43 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 chip soc/amd/sabrina
+
+	# eSPI Configuration
+	register "common_config.espi_config" = "{
+		.std_io_decode_bitmap = ESPI_DECODE_IO_0x80_EN | ESPI_DECODE_IO_0X60_0X64_EN,
+		.generic_io_range[0] = {
+			.base = 0x62,
+			/*
+			 * Only 0x62 and 0x66 are required. But, this is not supported by
+			 * standard IO decodes and there are only 4 generic I/O windows
+			 * available. Hence, open a window from 0x62-0x67.
+			 */
+			.size = 5,
+		},
+		.generic_io_range[1] = {
+			.base = 0x800,   /* EC_HOST_CMD_REGION0 */
+			.size = 256,     /* EC_HOST_CMD_REGION_SIZE * 2 */
+		},
+		.generic_io_range[2] = {
+			.base = 0x900,   /* EC_LPC_ADDR_MEMMAP */
+			.size = 255,     /* EC_MEMMAP_SIZE */
+		},
+		.generic_io_range[3] = {
+			.base = 0x200,   /* EC_LPC_ADDR_HOST_DATA */
+			.size = 8,       /* 0x200 - 0x207 */
+		},
+
+		.io_mode = ESPI_IO_MODE_QUAD,
+		.op_freq_mhz = ESPI_OP_FREQ_33_MHZ,
+		.crc_check_enable = 1,
+		.alert_pin = ESPI_ALERT_PIN_IN_BAND,
+		.periph_ch_en = 1,
+		.vw_ch_en = 1,
+		.oob_ch_en = 0,
+		.flash_ch_en = 0,
+
+		.vw_irq_polarity = ESPI_VW_IRQ_LEVEL_HIGH(1) | ESPI_VW_IRQ_LEVEL_HIGH(12),
+	}"
+
 	register "i2c_scl_reset" = "GPIO_I2C0_SCL | GPIO_I2C1_SCL |
 					GPIO_I2C2_SCL | GPIO_I2C3_SCL"