1 files changed, 121 insertions, 0 deletions
diff --git a/src/mainboard/prodrive/hermes/eeprom.h b/src/mainboard/prodrive/hermes/eeprom.h
new file mode 100644
index 0000000000..0d4e9d8e31
--- /dev/null
+++ b/src/mainboard/prodrive/hermes/eeprom.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <soc/ramstage.h>
+
+union eeprom_dimm_layout {
+	struct __packed {
+		char name[50];
+		char manufacturer[50];
+		uint8_t ranks;
+		uint8_t controller_id;
+		uint8_t data_width_bits;
+		uint8_t bus_width_bits;
+		uint32_t capacity_mib;
+		uint32_t max_tdp_milliwatts;
+	};
+	uint8_t raw[0x80];
+};
+
+_Static_assert(sizeof(union eeprom_dimm_layout) == 0x80,
+		"union eeprom_dimm_layout has invalid size!");
+
+struct __packed eeprom_board_layout {
+	uint32_t signature;
+	union {
+		struct __packed {
+			char cpu_name[50];
+			uint8_t cpu_count;
+			uint32_t cpu_max_non_turbo_frequency;
+			char pch_name[50];
+			union eeprom_dimm_layout dimm[4];
+		};
+		uint8_t raw_layout[617];
+	};
+};
+
+_Static_assert(sizeof(struct eeprom_board_layout) == (617 + sizeof(uint32_t)),
+		"struct eeprom_board_layout has invalid size!");
+
+struct __packed eeprom_board_settings {
+	uint32_t signature;
+	union {
+		struct __packed {
+			uint8_t secureboot;
+			uint8_t primary_video;
+			uint8_t deep_sx_enabled;
+			uint8_t wake_on_usb;
+			uint8_t usb_powered_in_s5;
+			uint8_t power_state_after_g3;
+			uint8_t blue_rear_vref;
+			uint8_t front_panel_audio;
+			uint8_t pxe_boot_capability;
+		};
+		uint8_t raw_settings[9];
+	};
+};
+
+_Static_assert(sizeof(struct eeprom_board_settings) == (9 + sizeof(uint32_t)),
+		"struct eeprom_board_settings has invalid size!");
+
+struct __packed eeprom_bmc_settings {
+	uint8_t pcie_mux;
+	uint8_t hsi;
+};
+
+#define HERMES_SERIAL_NUMBER_LENGTH	32
+
+/* The EEPROM on address 0x57 has the following vendor defined layout: */
+struct __packed eeprom_layout {
+	union {
+		uint8_t RawFSPMUPD[0x600];
+		FSPM_UPD mupd;
+	};
+	union {
+		uint8_t RawFSPSUPD[0xC00];
+		FSPS_UPD supd;
+	};
+	union {
+		uint8_t RawBoardLayout[0x400];
+		struct eeprom_board_layout BoardLayout;
+	};
+	char system_serial_number[HERMES_SERIAL_NUMBER_LENGTH];
+	char board_serial_number[HERMES_SERIAL_NUMBER_LENGTH];
+	uint8_t BootOrder[0x8c0];
+	union {
+		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");
+_Static_assert(sizeof(FSPS_UPD) <= 0xC00, "FSPS_UPD too big");
+_Static_assert(sizeof(struct eeprom_layout) == 0x2000, "EEPROM layout size mismatch");
+
+bool eeprom_read_buffer(void *blob, size_t read_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);
+uint8_t get_bmc_hsi(void);
+void report_eeprom_error(const size_t off);
+bool write_board_settings(const struct eeprom_board_layout *new_layout);
+
+#define READ_EEPROM(section_type, section_name, dest, opt_name)				\
+	do {										\
+		typeof(dest->opt_name) __tmp;						\
+		size_t __off = offsetof(struct eeprom_layout, section_name);		\
+		bool ret = eeprom_read_buffer(&__tmp,					\
+					__off + offsetof(section_type, opt_name),	\
+					sizeof(__tmp));					\
+		if (ret) {								\
+			report_eeprom_error(__off + offsetof(section_type, opt_name));	\
+		} else {								\
+			dest->opt_name = __tmp;						\
+		}									\
+	} while (0)
+
+#define READ_EEPROM_FSP_M(dest, opt_name) READ_EEPROM(FSPM_UPD, RawFSPMUPD, dest, opt_name)
+#define READ_EEPROM_FSP_S(dest, opt_name) READ_EEPROM(FSPS_UPD, RawFSPSUPD, dest, opt_name)