From 34e026f9b1eb3bcffb38e7787c2e6eac0e88ba85 Mon Sep 17 00:00:00 2001 From: York Sun Date: Thu, 27 Mar 2014 17:54:47 -0700 Subject: driver/ddr/fsl: Add DDR4 support to Freescale DDR driver Mostly reusing DDR3 driver, this patch adds DDR4 SPD handling, register calculation and programming. Signed-off-by: York Sun --- common/ddr_spd.c | 45 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 44 insertions(+), 1 deletion(-) (limited to 'common/ddr_spd.c') diff --git a/common/ddr_spd.c b/common/ddr_spd.c index 7a388bb9fa1..438e71afd20 100644 --- a/common/ddr_spd.c +++ b/common/ddr_spd.c @@ -1,5 +1,5 @@ /* - * Copyright 2008 Freescale Semiconductor, Inc. + * Copyright 2008-2014 Freescale Semiconductor, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -116,3 +116,46 @@ ddr3_spd_check(const ddr3_spd_eeprom_t *spd) return 1; } } + +unsigned int ddr4_spd_check(const struct ddr4_spd_eeprom_s *spd) +{ + char *p = (char *)spd; + int csum16; + int len; + char crc_lsb; /* byte 126 */ + char crc_msb; /* byte 127 */ + + len = 126; + csum16 = crc16(p, len); + + crc_lsb = (char) (csum16 & 0xff); + crc_msb = (char) (csum16 >> 8); + + if (spd->crc[0] != crc_lsb || spd->crc[1] != crc_msb) { + printf("SPD checksum unexpected.\n" + "Checksum lsb in SPD = %02X, computed SPD = %02X\n" + "Checksum msb in SPD = %02X, computed SPD = %02X\n", + spd->crc[0], crc_lsb, spd->crc[1], crc_msb); + return 1; + } + + p = (char *)((ulong)spd + 128); + len = 126; + csum16 = crc16(p, len); + + crc_lsb = (char) (csum16 & 0xff); + crc_msb = (char) (csum16 >> 8); + + if (spd->mod_section.uc[126] != crc_lsb || + spd->mod_section.uc[127] != crc_msb) { + printf("SPD checksum unexpected.\n" + "Checksum lsb in SPD = %02X, computed SPD = %02X\n" + "Checksum msb in SPD = %02X, computed SPD = %02X\n", + spd->mod_section.uc[126], + crc_lsb, spd->mod_section.uc[127], + crc_msb); + return 1; + } + + return 0; +} -- cgit v1.2.3