Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / common / ddr_spd.c

diff --git a/qemu/roms/u-boot/common/ddr_spd.c b/qemu/roms/u-boot/common/ddr_spd.c
new file mode 100644 (file)
index 0000000..438e71a
--- /dev/null
+++ b/qemu/roms/u-boot/common/ddr_spd.c
@@ -0,0 +1,161 @@
+/*
+ * 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
+ * Version 2 as published by the Free Software Foundation.
+ */
+
+#include <common.h>
+#include <ddr_spd.h>
+
+/* used for ddr1 and ddr2 spd */
+static int
+spd_check(const u8 *buf, u8 spd_rev, u8 spd_cksum)
+{
+       unsigned int cksum = 0;
+       unsigned int i;
+
+       /*
+        * Check SPD revision supported
+        * Rev 1.X or less supported by this code
+        */
+       if (spd_rev >= 0x20) {
+               printf("SPD revision %02X not supported by this code\n",
+                      spd_rev);
+               return 1;
+       }
+       if (spd_rev > 0x13) {
+               printf("SPD revision %02X not verified by this code\n",
+                      spd_rev);
+       }
+
+       /*
+        * Calculate checksum
+        */
+       for (i = 0; i < 63; i++) {
+               cksum += *buf++;
+       }
+       cksum &= 0xFF;
+
+       if (cksum != spd_cksum) {
+               printf("SPD checksum unexpected. "
+                       "Checksum in SPD = %02X, computed SPD = %02X\n",
+                       spd_cksum, cksum);
+               return 1;
+       }
+
+       return 0;
+}
+
+unsigned int
+ddr1_spd_check(const ddr1_spd_eeprom_t *spd)
+{
+       const u8 *p = (const u8 *)spd;
+
+       return spd_check(p, spd->spd_rev, spd->cksum);
+}
+
+unsigned int
+ddr2_spd_check(const ddr2_spd_eeprom_t *spd)
+{
+       const u8 *p = (const u8 *)spd;
+
+       return spd_check(p, spd->spd_rev, spd->cksum);
+}
+
+/*
+ * CRC16 compute for DDR3 SPD
+ * Copied from DDR3 SPD spec.
+ */
+static int
+crc16(char *ptr, int count)
+{
+       int crc, i;
+
+       crc = 0;
+       while (--count >= 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 & 0xffff;
+}
+
+unsigned int
+ddr3_spd_check(const ddr3_spd_eeprom_t *spd)
+{
+       char *p = (char *)spd;
+       int csum16;
+       int len;
+       char crc_lsb;   /* byte 126 */
+       char crc_msb;   /* byte 127 */
+
+       /*
+        * SPD byte0[7] - CRC coverage
+        * 0 = CRC covers bytes 0~125
+        * 1 = CRC covers bytes 0~116
+        */
+
+       len = !(spd->info_size_crc & 0x80) ? 126 : 117;
+       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) {
+               return 0;
+       } else {
+               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;
+       }
+}
+
+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;
+}