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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
158 lines
3.1 KiB
C
158 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2008-2014 Freescale Semiconductor, Inc.
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*/
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#include <common.h>
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#include <ddr_spd.h>
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/* used for ddr1 and ddr2 spd */
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static int
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spd_check(const u8 *buf, u8 spd_rev, u8 spd_cksum)
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{
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unsigned int cksum = 0;
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unsigned int i;
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/*
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* Check SPD revision supported
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* Rev 1.X or less supported by this code
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*/
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if (spd_rev >= 0x20) {
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printf("SPD revision %02X not supported by this code\n",
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spd_rev);
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return 1;
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}
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if (spd_rev > 0x13) {
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printf("SPD revision %02X not verified by this code\n",
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spd_rev);
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}
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/*
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* Calculate checksum
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*/
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for (i = 0; i < 63; i++) {
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cksum += *buf++;
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}
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cksum &= 0xFF;
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if (cksum != spd_cksum) {
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printf("SPD checksum unexpected. "
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"Checksum in SPD = %02X, computed SPD = %02X\n",
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spd_cksum, cksum);
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return 1;
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}
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return 0;
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}
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unsigned int
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ddr1_spd_check(const ddr1_spd_eeprom_t *spd)
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{
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const u8 *p = (const u8 *)spd;
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return spd_check(p, spd->spd_rev, spd->cksum);
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}
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unsigned int
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ddr2_spd_check(const ddr2_spd_eeprom_t *spd)
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{
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const u8 *p = (const u8 *)spd;
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return spd_check(p, spd->spd_rev, spd->cksum);
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}
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/*
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* CRC16 compute for DDR3 SPD
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* Copied from DDR3 SPD spec.
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*/
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static int
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crc16(char *ptr, int count)
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{
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int crc, i;
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crc = 0;
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while (--count >= 0) {
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crc = crc ^ (int)*ptr++ << 8;
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for (i = 0; i < 8; ++i)
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if (crc & 0x8000)
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crc = crc << 1 ^ 0x1021;
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else
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crc = crc << 1;
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}
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return crc & 0xffff;
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}
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unsigned int
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ddr3_spd_check(const ddr3_spd_eeprom_t *spd)
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{
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char *p = (char *)spd;
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int csum16;
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int len;
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char crc_lsb; /* byte 126 */
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char crc_msb; /* byte 127 */
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/*
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* SPD byte0[7] - CRC coverage
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* 0 = CRC covers bytes 0~125
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* 1 = CRC covers bytes 0~116
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*/
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len = !(spd->info_size_crc & 0x80) ? 126 : 117;
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csum16 = crc16(p, len);
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crc_lsb = (char) (csum16 & 0xff);
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crc_msb = (char) (csum16 >> 8);
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if (spd->crc[0] == crc_lsb && spd->crc[1] == crc_msb) {
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return 0;
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} else {
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printf("SPD checksum unexpected.\n"
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"Checksum lsb in SPD = %02X, computed SPD = %02X\n"
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"Checksum msb in SPD = %02X, computed SPD = %02X\n",
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spd->crc[0], crc_lsb, spd->crc[1], crc_msb);
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return 1;
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}
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}
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unsigned int ddr4_spd_check(const struct ddr4_spd_eeprom_s *spd)
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{
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char *p = (char *)spd;
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int csum16;
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int len;
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char crc_lsb; /* byte 126 */
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char crc_msb; /* byte 127 */
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len = 126;
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csum16 = crc16(p, len);
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crc_lsb = (char) (csum16 & 0xff);
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crc_msb = (char) (csum16 >> 8);
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if (spd->crc[0] != crc_lsb || spd->crc[1] != crc_msb) {
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printf("SPD checksum unexpected.\n"
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"Checksum lsb in SPD = %02X, computed SPD = %02X\n"
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"Checksum msb in SPD = %02X, computed SPD = %02X\n",
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spd->crc[0], crc_lsb, spd->crc[1], crc_msb);
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return 1;
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}
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p = (char *)((ulong)spd + 128);
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len = 126;
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csum16 = crc16(p, len);
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crc_lsb = (char) (csum16 & 0xff);
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crc_msb = (char) (csum16 >> 8);
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if (spd->mod_section.uc[126] != crc_lsb ||
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spd->mod_section.uc[127] != crc_msb) {
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printf("SPD checksum unexpected.\n"
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"Checksum lsb in SPD = %02X, computed SPD = %02X\n"
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"Checksum msb in SPD = %02X, computed SPD = %02X\n",
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spd->mod_section.uc[126],
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crc_lsb, spd->mod_section.uc[127],
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crc_msb);
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return 1;
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}
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return 0;
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}
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