83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
159 lines
3.1 KiB
C
159 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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