diff options
Diffstat (limited to 'src/device')
| -rw-r--r-- | src/device/dram/ddr3.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/device/dram/ddr3.c b/src/device/dram/ddr3.c index fe9de2d8e7..6bfaabcd76 100644 --- a/src/device/dram/ddr3.c +++ b/src/device/dram/ddr3.c @@ -116,6 +116,8 @@ int spd_decode_ddr3(dimm_attr * dimm, spd_raw_data spd) /* Don't assume we memset 0 dimm struct. Clear all our flags */ dimm->flags.raw = 0; + dimm->dimms_per_channel = 3; + /* Make sure that the SPD dump is indeed from a DDR3 module */ if (spd[2] != SPD_MEMORY_TYPE_SDRAM_DDR3) { printram("Not a DDR3 SPD!\n"); @@ -180,14 +182,17 @@ int spd_decode_ddr3(dimm_attr * dimm, spd_raw_data spd) printram(" Supported voltages:"); if (reg8 & (1 << 2)) { dimm->flags.operable_1_25V = 1; + dimm->voltage = 1250; printram(" 1.25V"); } if (reg8 & (1 << 1)) { dimm->flags.operable_1_35V = 1; + dimm->voltage = 1300; printram(" 1.35V"); } if (!(reg8 & (1 << 0))) { dimm->flags.operable_1_50V = 1; + dimm->voltage = 1500; printram(" 1.5V"); } printram("\n"); @@ -338,6 +343,118 @@ int spd_decode_ddr3(dimm_attr * dimm, spd_raw_data spd) return ret; } +/** + * \brief Decode the raw SPD XMP data + * + * Decodes a raw SPD XMP data from a DDR3 DIMM, and organizes it into a + * @ref dimm_attr structure. The SPD data must first be read in a contiguous + * array, and passed to this function. + * + * @param dimm pointer to @ref dimm_attr structure where the decoded data is to + * be stored + * @param spd array of raw data previously read from the SPD. + * + * @param profile select one of the profiles to load + * + * @return @ref spd_status enumerator + * SPD_STATUS_OK -- decoding was successful + * SPD_STATUS_INVALID -- invalid SPD or not a DDR3 SPD + * SPD_STATUS_CRC_ERROR -- CRC did not verify + * SPD_STATUS_INVALID_FIELD -- A field with an invalid value was + * detected. + */ +int spd_xmp_decode_ddr3(dimm_attr *dimm, + spd_raw_data spd, + enum ddr3_xmp_profile profile) +{ + int ret; + u32 mtb; /* medium time base */ + u8 *xmp; /* pointer to XMP profile data */ + + /* need a valid SPD */ + ret = spd_decode_ddr3(dimm, spd); + if (ret != SPD_STATUS_OK) + return ret; + + /* search for magic header */ + if (spd[176] != 0x0C || spd[177] != 0x4A) { + printram("Not a DDR3 XMP profile!\n"); + dimm->dram_type = SPD_MEMORY_TYPE_UNDEFINED; + return SPD_STATUS_INVALID; + } + + if (profile == DDR3_XMP_PROFILE_1) { + if (!(spd[178] & 1)) { + printram("Selected XMP profile disabled!\n"); + dimm->dram_type = SPD_MEMORY_TYPE_UNDEFINED; + return SPD_STATUS_INVALID; + } + printram(" XMP Profile 1\n"); + xmp = &spd[185]; + + /* Medium Timebase = + * Medium Timebase (MTB) Dividend / + * Medium Timebase (MTB) Divisor */ + mtb = (((u32) spd[180]) << 8) / spd[181]; + + dimm->dimms_per_channel = ((spd[178] >> 2) & 0x3) + 1; + } else { + if (!(spd[178] & 2)) { + printram("Selected XMP profile disabled!\n"); + dimm->dram_type = SPD_MEMORY_TYPE_UNDEFINED; + return SPD_STATUS_INVALID; + } + printram(" XMP Profile 2\n"); + xmp = &spd[220]; + + /* Medium Timebase = + * Medium Timebase (MTB) Dividend / + * Medium Timebase (MTB) Divisor */ + mtb = (((u32) spd[182]) << 8) / spd[183]; + + dimm->dimms_per_channel = ((spd[178] >> 4) & 0x3) + 1; + } + printram(" Max DIMMs per channel: %u\n", + dimm->dimms_per_channel); + + printram(" XMP Revision: %u.%u\n", spd[179] >> 4, spd[179] & 0xf); + + /* calculate voltage in mV */ + dimm->voltage = (xmp[0] & 1) * 50; + dimm->voltage += ((xmp[0] >> 1) & 0xf) * 100; + dimm->voltage += ((xmp[0] >> 5) & 0x3) * 1000; + printram(" Requested voltage: %u mV\n", dimm->voltage); + + /* SDRAM Minimum Cycle Time (tCKmin) */ + dimm->tCK = xmp[1] * mtb; + /* CAS Latencies Supported */ + dimm->cas_supported = (xmp[9] << 8) + xmp[8]; + /* Minimum CAS Latency Time (tAAmin) */ + dimm->tAA = xmp[2] * mtb; + /* Minimum Write Recovery Time (tWRmin) */ + dimm->tWR = xmp[8] * mtb; + /* Minimum RAS# to CAS# Delay Time (tRCDmin) */ + dimm->tRCD = xmp[7] * mtb; + /* Minimum Row Active to Row Active Delay Time (tRRDmin) */ + dimm->tRRD = xmp[17] * mtb; + /* Minimum Row Precharge Delay Time (tRPmin) */ + dimm->tRP = xmp[6] * mtb; + /* Minimum Active to Precharge Delay Time (tRASmin) */ + dimm->tRAS = (((xmp[9] & 0x0f) << 8) + xmp[10]) * mtb; + /* Minimum Active to Active/Refresh Delay Time (tRCmin) */ + dimm->tRC = (((xmp[9] & 0xf0) << 4) + xmp[11]) * mtb; + /* Minimum Refresh Recovery Delay Time (tRFCmin) */ + dimm->tRFC = ((xmp[15] << 8) + xmp[14]) * mtb; + /* Minimum Internal Write to Read Command Delay Time (tWTRmin) */ + dimm->tWTR = xmp[20] * mtb; + /* Minimum Internal Read to Precharge Command Delay Time (tRTPmin) */ + dimm->tRTP = xmp[16] * mtb; + /* Minimum Four Activate Window Delay Time (tFAWmin) */ + dimm->tFAW = (((xmp[18] & 0x0f) << 8) + xmp[19]) * mtb; + + return ret; +} + /* * The information printed below has a more informational character, and is not * necessarily tied in to RAM init debugging. Hence, we stop using printram(), |