src/device/dram/ddr_common.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <device/dram/common.h>
   4 #include <types.h>
   5
   6 /**
   7  * \brief Calculate the CRC of a DDR SPD data
   8  *
   9  * @param spd pointer to raw SPD data
  10  * @param len length of data in SPD
  11  *
  12  * @return the CRC of the SPD data
  13  */
  14 u16 ddr_crc16(const u8 *ptr, int n_crc)
  15 {
  16         int i;
  17         u16 crc = 0;
  18
  19         while (--n_crc >= 0) {
  20                 crc = crc ^ ((int)*ptr++ << 8);
  21                 for (i = 0; i < 8; ++i)
  22                         if (crc & 0x8000)
  23                                 crc = (crc << 1) ^ 0x1021;
  24                         else
  25                                 crc = crc << 1;
  26         }
  27
  28         return crc;
  29 }