ddr_common.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#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;
}