diff options
Diffstat (limited to 'src/soc/intel/fsp_broadwell_de/smbus-imc.c')
-rw-r--r-- | src/soc/intel/fsp_broadwell_de/smbus-imc.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/soc/intel/fsp_broadwell_de/smbus-imc.c b/src/soc/intel/fsp_broadwell_de/smbus-imc.c new file mode 100644 index 0000000000..35e42da409 --- /dev/null +++ b/src/soc/intel/fsp_broadwell_de/smbus-imc.c @@ -0,0 +1,59 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2019 Facebook, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <stddef.h> +#include <console/console.h> +#include <device/pci_def.h> +#include <device/early_smbus.h> +#include <intelblocks/imc.h> +#include <soc/pci_devs.h> +#include <spd.h> + +/* read word, return value on success */ +uint16_t smbus_read_word(u32 smbus_dev, u8 addr, u8 offset) +{ + uint16_t res = 0; + + if (imc_smbus_spd_xfer(IMC_DEV, addr, offset, IMC_DEVICE_EEPROM, IMC_DATA_WORD, + IMC_CONTROLLER_ID0, IMC_READ, &res) + == 0) { + return res; + } + return 0; +} + +/* read byte, return value on success */ +uint8_t smbus_read_byte(u32 smbus_dev, u8 addr, u8 offset) +{ + uint16_t res = 0; + + if (imc_smbus_spd_xfer(IMC_DEV, addr, offset, IMC_DEVICE_EEPROM, IMC_DATA_BYTE, + IMC_CONTROLLER_ID0, IMC_READ, &res) + == 0) { + return res; + } + return 0; +} + +/* write byte, return 0 on success, -1 otherwise */ +uint8_t smbus_write_byte(u32 smbus_dev, u8 addr, u8 offset, u8 value) +{ + if (imc_smbus_spd_xfer(IMC_DEV, addr, offset, IMC_DEVICE_WP_EEPROM, IMC_DATA_BYTE, + IMC_CONTROLLER_ID0, IMC_WRITE, &value) + == 0) { + return 0; + } + return -1; +} |