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-rw-r--r--src/device/dram/ddr3.c372
1 files changed, 372 insertions, 0 deletions
diff --git a/src/device/dram/ddr3.c b/src/device/dram/ddr3.c
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+++ b/src/device/dram/ddr3.c
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+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011-2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file ddr3_util.h
+ *
+ * \brief Utilities for decoding DDR3 SPDs
+ */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/dram/ddr3.h>
+
+/**
+ * \brief Checks if the DIMM is Registered based on byte[3] of the SPD
+ *
+ * Tells if the DIMM type is registered or not.
+ *
+ * @param type DIMM type. This is byte[3] of the SPD.
+ */
+int dimm_is_registered(enum spd_dimm_type type)
+{
+ if ((type == SPD_DIMM_TYPE_RDIMM)
+ | (type == SPD_DIMM_TYPE_MINI_RDIMM)
+ | (type == SPD_DIMM_TYPE_72B_SO_RDIMM))
+ return 1;
+
+ return 0;
+}
+
+/**
+ * \brief Decode the raw SPD data
+ *
+ * Decodes a raw SPD 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 stucture where the decoded data is to
+ * be stored
+ * @param spd array of raw data previously read from the SPD.
+ *
+ * @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_decode_ddr3(dimm_attr * dimm, spd_raw_data spd)
+{
+ int nCRC, i, ret;
+ u16 crc, spd_crc;
+ u8 *ptr = spd;
+ u8 ftb_divisor, ftb_dividend, capacity_shift, bus_width, sdram_width;
+ u8 reg8;
+ u32 mtb; /* medium time base */
+ unsigned int val, param;
+
+ ret = SPD_STATUS_OK;
+
+ /* Don't assume we memset 0 dimm struct. Clear all our flags */
+ dimm->flags.raw = 0;
+ /* 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");
+ dimm->dram_type = SPD_MEMORY_TYPE_UNDEFINED;
+ return SPD_STATUS_INVALID;
+ }
+ dimm->dram_type = SPD_MEMORY_TYPE_SDRAM_DDR3;
+
+ /* Find the number of bytes covered by CRC */
+ if (spd[0] & 0x80) {
+ nCRC = 117;
+ } else {
+ nCRC = 126;
+ }
+
+ /* Compute the CRC */
+ crc = 0;
+ while (--nCRC >= 0) {
+ crc = crc ^ (int)*ptr++ << 8;
+ for (i = 0; i < 8; ++i)
+ if (crc & 0x8000) {
+ crc = crc << 1 ^ 0x1021;
+ } else {
+ crc = crc << 1;
+ }
+ }
+ /* Compare with the CRC in the SPD */
+ spd_crc = (spd[127] << 8) + spd[126];
+ /* Verify the CRC is correct */
+ if (crc != spd_crc) {
+ printram("ERROR: SPD CRC failed!!!");
+ ret = SPD_STATUS_CRC_ERROR;
+ };
+
+ printram(" Revision: %x\n", spd[1]);
+ printram(" Type : %x\n", spd[2]);
+ printram(" Key : %x\n", spd[3]);
+
+ reg8 = spd[4];
+ /* Number of memory banks */
+ val = (reg8 >> 4) & 0x07;
+ if (val > 0x03) {
+ printram(" Invalid number of memory banks\n");
+ ret = SPD_STATUS_INVALID_FIELD;
+ }
+ param = 1 << (val + 3);
+ printram(" Banks : %u\n", param);
+ /* SDRAM capacity */
+ capacity_shift = reg8 & 0x0f;
+ if (capacity_shift > 0x06) {
+ printram(" Invalid module capacity\n");
+ ret = SPD_STATUS_INVALID_FIELD;
+ }
+ if (capacity_shift < 0x02) {
+ printram(" Capacity: %u Mb\n", 256 << capacity_shift);
+ } else {
+ printram(" Capacity: %u Gb\n", 1 << (capacity_shift - 2));
+ }
+
+ reg8 = spd[5];
+ /* Row address bits */
+ val = (reg8 >> 3) & 0x07;
+ if (val > 0x04) {
+ printram(" Invalid row address bits\n");
+ ret = SPD_STATUS_INVALID_FIELD;
+ }
+ dimm->row_bits = val + 12;
+ /* Column address bits */
+ val = reg8 & 0x07;
+ if (val > 0x03) {
+ printram(" Invalid column address bits\n");
+ ret = SPD_STATUS_INVALID_FIELD;
+ }
+ dimm->col_bits = val + 9;
+
+ /* Module nominal voltage */
+ reg8 = spd[6];
+ printram(" Supported voltages:");
+ if (reg8 & (1 << 2)) {
+ dimm->flags.operable_1_25V = 1;
+ printram(" 1.25V");
+ }
+ if (reg8 & (1 << 1)) {
+ dimm->flags.operable_1_35V = 1;
+ printram(" 1.35V");
+ }
+ if (!(reg8 & (1 << 0))) {
+ dimm->flags.operable_1_50V = 1;
+ printram(" 1.5V");
+ }
+ printram("\n");
+
+ /* Module organization */
+ reg8 = spd[7];
+ /* Number of ranks */
+ val = (reg8 >> 3) & 0x07;
+ if (val > 3) {
+ printram(" Invalid number of ranks\n");
+ ret = SPD_STATUS_INVALID_FIELD;
+ }
+ dimm->ranks = val + 1;
+ /* SDRAM device width */
+ val = (reg8 & 0x07);
+ if (val > 3) {
+ printram(" Invalid SDRAM width\n");
+ ret = SPD_STATUS_INVALID_FIELD;
+ }
+ sdram_width = (4 << val);
+ printram(" SDRAM width : %u\n", sdram_width);
+
+ /* Memory bus width */
+ reg8 = spd[8];
+ /* Bus extension */
+ val = (reg8 >> 3) & 0x03;
+ if (val > 1) {
+ printram(" Invalid bus extension\n");
+ ret = SPD_STATUS_INVALID_FIELD;
+ }
+ dimm->flags.is_ecc = val ? 1 : 0;
+ printram(" Bus extension : %u bits\n", val ? 8 : 0);
+ /* Bus width */
+ val = reg8 & 0x07;
+ if (val > 3) {
+ printram(" Invalid bus width\n");
+ ret = SPD_STATUS_INVALID_FIELD;
+ }
+ bus_width = 8 << val;
+ printram(" Bus width : %u\n", bus_width);
+
+ /* We have all the info we need to compute the dimm size */
+ /* Capacity is 256Mbit multiplied by the power of 2 specified in
+ * capacity_shift
+ * The rest is the JEDEC formula */
+ dimm->size_mb = ((1 << (capacity_shift + (25 - 20))) * bus_width
+ * dimm->ranks) / sdram_width;
+
+ /* Fine Timebase (FTB) Dividend/Divisor */
+ /* Dividend */
+ ftb_dividend = (spd[9] >> 4) & 0x0f;
+ /* Divisor */
+ ftb_divisor = spd[9] & 0x0f;
+
+ /* Medium Timebase =
+ * Medium Timebase (MTB) Dividend /
+ * Medium Timebase (MTB) Divisor */
+ mtb = (((u32) spd[10]) << 8) / spd[11];
+
+ /* SDRAM Minimum Cycle Time (tCKmin) */
+ dimm->tCK = spd[12] * mtb;
+ /* CAS Latencies Supported */
+ dimm->cas_supported = (spd[15] << 8) + spd[14];
+ /* Minimum CAS Latency Time (tAAmin) */
+ dimm->tAA = spd[16] * mtb;
+ /* Minimum Write Recovery Time (tWRmin) */
+ dimm->tWR = spd[17] * mtb;
+ /* Minimum RAS# to CAS# Delay Time (tRCDmin) */
+ dimm->tRCD = spd[18] * mtb;
+ /* Minimum Row Active to Row Active Delay Time (tRRDmin) */
+ dimm->tRRD = spd[19] * mtb;
+ /* Minimum Row Precharge Delay Time (tRPmin) */
+ dimm->tRP = spd[20] * mtb;
+ /* Minimum Active to Precharge Delay Time (tRASmin) */
+ dimm->tRAS = (((spd[21] & 0x0f) << 8) + spd[22]) * mtb;
+ /* Minimum Active to Active/Refresh Delay Time (tRCmin) */
+ dimm->tRC = (((spd[21] & 0xf0) << 4) + spd[23]) * mtb;
+ /* Minimum Refresh Recovery Delay Time (tRFCmin) */
+ dimm->tRFC = ((spd[25] << 8) + spd[24]) * mtb;
+ /* Minimum Internal Write to Read Command Delay Time (tWTRmin) */
+ dimm->tWTR = spd[26] * mtb;
+ /* Minimum Internal Read to Precharge Command Delay Time (tRTPmin) */
+ dimm->tRTP = spd[27] * mtb;
+ /* Minimum Four Activate Window Delay Time (tFAWmin) */
+ dimm->tFAW = (((spd[28] & 0x0f) << 8) + spd[29]) * mtb;
+
+ /* SDRAM Optional Features */
+ reg8 = spd[30];
+ printram(" Optional features :");
+ if (reg8 & 0x80) {
+ dimm->flags.dll_off_mode = 1;
+ printram(" DLL-Off_mode");
+ }
+ if (reg8 & 0x02) {
+ dimm->flags.rzq7_supported = 1;
+ printram(" RZQ/7");
+ }
+ if (reg8 & 0x01) {
+ dimm->flags.rzq6_supported = 1;
+ printram(" RZQ/6");
+ }
+ printram("\n");
+
+ /* SDRAM Thermal and Refresh Options */
+ reg8 = spd[31];
+ printram(" Thermal features :");
+ if (reg8 & 0x80) {
+ dimm->flags.pasr = 1;
+ printram(" PASR");
+ }
+ if (reg8 & 0x08) {
+ dimm->flags.odts = 1;
+ printram(" ODTS");
+ }
+ if (reg8 & 0x04) {
+ dimm->flags.asr = 1;
+ printram(" ASR");
+ }
+ if (reg8 & 0x02) {
+ dimm->flags.ext_temp_range = 1;
+ printram(" ext_temp_refresh");
+ }
+ if (reg8 & 0x01) {
+ dimm->flags.ext_temp_refresh = 1;
+ printram(" ext_temp_range");
+ }
+ printram("\n");
+
+ /* Module Thermal Sensor */
+ reg8 = spd[32];
+ if (reg8 & 0x80)
+ dimm->flags.therm_sensor = 1;
+ printram(" Thermal sensor : %s\n",
+ dimm->flags.therm_sensor ? "yes" : "no");
+
+ /* SDRAM Device Type */
+ reg8 = spd[33];
+ printram(" Standard SDRAM : %s\n", (reg8 & 0x80) ? "no" : "yes");
+
+ if (spd[63] & 0x01) {
+ dimm->flags.pins_mirrored = 1;
+ printram(" DIMM Rank1 Address bits mirrorred!!!\n");
+ }
+
+ 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(),
+ * and use the standard printk()'s below.
+ */
+
+static void print_ns(const char *msg, u32 val)
+{
+ u32 mant, fp;
+ mant = val / 256;
+ fp = (val % 256) * 1000 / 256;
+
+ printk(BIOS_INFO, "%s%3u.%.3u ns\n", msg, mant, fp);
+}
+
+/**
+* \brief Print the info in DIMM
+*
+* Print info about the DIMM. Useful to use when CONFIG_DEBUG_RAM_SETUP is
+* selected, or for a purely informative output.
+*
+* @param dimm pointer to already decoded @ref dimm_attr stucture
+*/
+void dram_print_spd_ddr3(const dimm_attr * dimm)
+{
+ u16 val16;
+ int i;
+
+ printk(BIOS_INFO, " Row addr bits : %u\n", dimm->row_bits);
+ printk(BIOS_INFO, " Column addr bits : %u\n", dimm->col_bits);
+ printk(BIOS_INFO, " Number of ranks : %u\n", dimm->ranks);
+ printk(BIOS_INFO, " DIMM Capacity : %u MB\n", dimm->size_mb);
+
+ /* CAS Latencies Supported */
+ val16 = dimm->cas_supported;
+ printk(BIOS_INFO, " CAS latencies :");
+ i = 0;
+ do {
+ if (val16 & 1)
+ printk(BIOS_INFO, " %u", i + 4);
+ i++;
+ val16 >>= 1;
+ } while (val16);
+ printk(BIOS_INFO, "\n");
+
+ print_ns(" tCKmin : ", dimm->tCK);
+ print_ns(" tAAmin : ", dimm->tAA);
+ print_ns(" tWRmin : ", dimm->tWR);
+ print_ns(" tRCDmin : ", dimm->tRCD);
+ print_ns(" tRRDmin : ", dimm->tRRD);
+ print_ns(" tRPmin : ", dimm->tRP);
+ print_ns(" tRASmin : ", dimm->tRAS);
+ print_ns(" tRCmin : ", dimm->tRC);
+ print_ns(" tRFCmin : ", dimm->tRFC);
+ print_ns(" tWTRmin : ", dimm->tWTR);
+ print_ns(" tRTPmin : ", dimm->tRTP);
+ print_ns(" tFAWmin : ", dimm->tFAW);
+
+}
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