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/*
* 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 <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;
}
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