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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 <console/console.h>
#include <device/dram/common.h>
#include <types.h>
/**
* \brief Calculate the CRC of a DDR SPD data
*
* @param spd pointer to raw SPD data
* @param len length of data in SPD
*
* @return the CRC of the SPD data
*/
u16 ddr_crc16(const u8 *ptr, int n_crc)
{
int i;
u16 crc = 0;
while (--n_crc >= 0) {
crc = crc ^ ((int)*ptr++ << 8);
for (i = 0; i < 8; ++i)
if (crc & 0x8000)
crc = (crc << 1) ^ 0x1021;
else
crc = crc << 1;
}
return crc;
}
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