mb/prodrive/hermes: Write reset cause regs to EEPROM

Write the value for reset cause registers to the EEPROM for debugging.

Change-Id: I827f38731fd868aac72103957e01aac8263f1cd3
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67483
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/prodrive/hermes/eeprom.c

@@ -153,7 +153,7 @@ void report_eeprom_error(const size_t off)
  * Write a single byte into the EEPROM at specified offset.
  * Returns true on error, false on success.
  */
-static bool eeprom_write_byte(const uint8_t data, const uint16_t write_offset)
+bool eeprom_write_byte(const uint8_t data, const uint16_t write_offset)
 {
 	int ret = 0;
 

src/mainboard/prodrive/hermes/eeprom.h

@@ -38,6 +38,12 @@ struct __packed eeprom_board_layout {
 _Static_assert(sizeof(struct eeprom_board_layout) == (617 + sizeof(uint32_t)),
 		"struct eeprom_board_layout has invalid size!");
 
+struct __packed eeprom_reset_cause_regs {
+	uint32_t gblrst_cause0;
+	uint32_t gblrst_cause1;
+	uint32_t hpr_cause0;
+};
+
 struct __packed eeprom_board_settings {
 	uint32_t signature;
 	union {
@@ -89,7 +95,11 @@ struct __packed eeprom_layout {
 	uint8_t boot_order[0x200];
 	char board_part_number[HERMES_SN_PN_LENGTH];
 	char product_part_number[HERMES_SN_PN_LENGTH];
-	uint8_t unused[0x680];
+	union {
+		struct eeprom_reset_cause_regs reset_cause_regs;
+		uint8_t raw_reset_cause_registers[0x80];
+	};
+	uint8_t unused[0x600];
 	union {
 		uint8_t raw_board_settings[0xf8];
 		struct eeprom_board_settings board_settings;
@@ -111,6 +121,7 @@ struct eeprom_bmc_settings *get_bmc_settings(void);
 const char *eeprom_read_serial(size_t offset, const char *fallback);
 uint8_t get_bmc_hsi(void);
 void report_eeprom_error(const size_t off);
+bool eeprom_write_byte(const uint8_t data, const uint16_t write_offset);
 bool write_board_settings(const struct eeprom_board_layout *new_layout);
 
 #define READ_EEPROM(section_type, section_name, dest, opt_name)				\

src/mainboard/prodrive/hermes/mainboard.c

@@ -14,6 +14,7 @@
 #include <intelblocks/pmclib.h>
 #include <smbios.h>
 #include <soc/gpio.h>
+#include <soc/pm.h>
 #include <string.h>
 #include <types.h>
 
@@ -249,6 +250,31 @@ struct chip_operations mainboard_ops = {
 	.enable_dev = mainboard_enable,
 };
 
+static void log_reset_causes(void)
+{
+	struct chipset_power_state *ps = pmc_get_power_state();
+
+	if (!ps) {
+		printk(BIOS_ERR, "chipset_power_state not found!\n");
+		return;
+	}
+
+	union {
+		struct eeprom_reset_cause_regs regs;
+		uint8_t raw[sizeof(struct eeprom_reset_cause_regs)];
+	} reset_cause = {
+		.regs = {
+			.gblrst_cause0 = ps->gblrst_cause[0],
+			.gblrst_cause1 = ps->gblrst_cause[1],
+			.hpr_cause0 = ps->hpr_cause0,
+		},
+	};
+
+	const size_t base = offsetof(struct eeprom_layout, reset_cause_regs);
+	for (size_t i = 0; i < ARRAY_SIZE(reset_cause.raw); i++)
+		eeprom_write_byte(reset_cause.raw[i], base + i);
+}
+
 /* Must happen before MPinit */
 static void mainboard_early(void *unused)
 {
@@ -273,6 +299,8 @@ static void mainboard_early(void *unused)
 		READ_EEPROM_FSP_S((&supd), FspsConfig.TurboMode);
 		config->cpu_turbo_disable = !supd.FspsConfig.TurboMode;
 	}
+
+	log_reset_causes();
 }
 
 BOOT_STATE_INIT_ENTRY(BS_PRE_DEVICE, BS_ON_EXIT, mainboard_early, NULL);