| /* |
| * 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; |
| } |