mb/prodrive/eeprom: Add BMC settings

Add settings describing the BMC.
Will be used by the following patch to read the board revision.

Change-Id: If464138fc1bdf02a45a21f638b179048d68d974d
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50787
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 30 insertions, 1 deletions

diff --git a/src/mainboard/prodrive/hermes/eeprom.c b/src/mainboard/prodrive/hermes/eeprom.c
index 58099d3aa8..9bdec4a79b 100644
--- a/src/mainboard/prodrive/hermes/eeprom.c
+++ b/src/mainboard/prodrive/hermes/eeprom.c
@@ -70,6 +70,25 @@ struct eeprom_board_settings *get_board_settings(void)
 	return checked_valid > 0 ? &board_cfg : NULL;
 }
 
+struct eeprom_bmc_settings *get_bmc_settings(void)
+{
+	const size_t bmc_settings_offset = offsetof(struct eeprom_layout, BMCSettings);
+	static struct eeprom_bmc_settings bmc_cfg = {0};
+
+	/* 0: uninitialized, 1: settings are valid */
+	static int valid = 0;
+
+	if (valid == 0) {
+		if (read_write_config(&bmc_cfg, bmc_settings_offset, 0, sizeof(bmc_cfg))) {
+			printk(BIOS_ERR, "CFG EEPROM: Failed to read BMC settings\n");
+			return NULL;
+		}
+		valid = 1;
+	}
+	return &bmc_cfg;
+}
+
+
 /* Read data from offset and write it to offset in UPD */
 bool read_write_config(void *blob, size_t read_offset, size_t write_offset, size_t size)
 {
diff --git a/src/mainboard/prodrive/hermes/variants/baseboard/include/eeprom.h b/src/mainboard/prodrive/hermes/variants/baseboard/include/eeprom.h
index 56539751f3..9b14d9c39f 100644
--- a/src/mainboard/prodrive/hermes/variants/baseboard/include/eeprom.h
+++ b/src/mainboard/prodrive/hermes/variants/baseboard/include/eeprom.h
@@ -48,6 +48,11 @@ __packed struct eeprom_board_settings {
 	};
 };
 
+__packed struct eeprom_bmc_settings {
+	uint8_t pcie_mux;
+	uint8_t hsi;
+};
+
 /* The EEPROM on address 0x57 has the following vendor defined layout: */
 __packed struct eeprom_layout {
 	union {
@@ -64,9 +69,13 @@ __packed struct eeprom_layout {
 	};
 	uint8_t BootOrder[0x900];
 	union {
-		uint8_t RawBoardSetting[0x100];
+		uint8_t RawBoardSetting[0xF8];
 		struct eeprom_board_settings BoardSettings;
 	};
+	union {
+		uint8_t RawBMCSetting[0x8];
+		struct eeprom_bmc_settings BMCSettings;
+	};
 };
 
 _Static_assert(sizeof(FSPM_UPD) <= 0x600, "FSPM_UPD too big");
@@ -76,6 +85,7 @@ _Static_assert(sizeof(struct eeprom_layout) == 0x2000, "EEPROM layout size misma
 bool read_write_config(void *blob, size_t read_offset, size_t write_offset, size_t size);
 int check_signature(const size_t offset, const uint64_t signature);
 struct eeprom_board_settings *get_board_settings(void);
+struct eeprom_bmc_settings *get_bmc_settings(void);
 void report_eeprom_error(const size_t off);
 bool write_board_settings(const struct eeprom_board_layout *new_layout);