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mb/prodrive/hermes: Define board settings in EEPROM 

Hermes has an EEPROM with firmware configuration data. Add definitions
to read and verify the `board settings` from the EEPROM. Subsequent
commits will hook up these EEPROM settings.

Change-Id: Id86632192ae53fd6b0e4df5b26b5a0a81e972818
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48806
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
This commit is contained in:
Angel Pons 2020-12-21 18:53:44 +01:00 committed by Patrick Georgi
parent fe97ee33e8
commit 7c7e9a2f16
2 changed files with 59 additions and 0 deletions
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40
src/mainboard/prodrive/hermes/eeprom.c
View File

@ -2,12 +2,17 @@
#include <device/pci_ops.h>
#include <console/console.h>
#include <crc_byte.h>
#include <device/smbus_host.h>
#include <soc/intel/common/block/smbus/smbuslib.h>
#include <types.h>
#include "variants/baseboard/include/eeprom.h"
#define I2C_ADDR_EEPROM 0x57
#define EEPROM_OFFSET_BOARD_SETTINGS 0x1f00
/*
* Check Signature in EEPROM (M24C32-FMN6TP)
* If signature is there we assume that that the content is valid
@ -28,6 +33,41 @@ int check_signature(const size_t offset, const uint64_t signature)
return 0;
}
/*
* Read board settings from the EEPROM and verify their checksum.
* If checksum is valid, we assume the settings are sane as well.
*/
static bool get_board_settings_from_eeprom(struct eeprom_board_settings *board_cfg)
{
if (read_write_config(board_cfg, EEPROM_OFFSET_BOARD_SETTINGS, 0, sizeof(*board_cfg))) {
printk(BIOS_ERR, "CFG EEPROM: Failed to read board settings\n");
return false;
}
const uint32_t crc =
CRC(&board_cfg->raw_settings, sizeof(board_cfg->raw_settings), crc32_byte);
if (crc != board_cfg->signature) {
printk(BIOS_ERR, "CFG EEPROM: Board settings have invalid checksum\n");
return false;
}
return true;
}
struct eeprom_board_settings *get_board_settings(void)
{
static struct eeprom_board_settings board_cfg = {0};
/* Tri-state: -1: settings are invalid, 0: uninitialized, 1: settings are valid */
static int checked_valid = 0;
if (checked_valid == 0) {
const bool success = get_board_settings_from_eeprom(&board_cfg);
checked_valid = success ? 1 : -1;
}
return checked_valid > 0 ? &board_cfg : NULL;
}
/* 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)
{

19
src/mainboard/prodrive/hermes/variants/baseboard/include/eeprom.h
View File

@ -18,6 +18,24 @@
.size = member_size(FSP_S_CONFIG, x)}
#endif /* ENV_ROMSTAGE */
__packed struct eeprom_board_settings {
uint32_t signature;
union {
struct {
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 internal_audio_connection;
uint8_t pxe_boot_capability;
};
uint8_t raw_settings[9];
};
};
typedef struct {
size_t offset;
size_t size;
@ -25,3 +43,4 @@ typedef struct {
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);