summaryrefslogtreecommitdiff
path: root/src/device/dram
diff options
context:
space:
mode:
Diffstat (limited to 'src/device/dram')
-rw-r--r--src/device/dram/Makefile.inc2
-rw-r--r--src/device/dram/ddr2.c2
-rw-r--r--src/device/dram/ddr3.c23
-rw-r--r--src/device/dram/ddr4.c248
-rw-r--r--src/device/dram/ddr_common.c43
5 files changed, 296 insertions, 22 deletions
diff --git a/src/device/dram/Makefile.inc b/src/device/dram/Makefile.inc
index c982ef49e8..f397a534f2 100644
--- a/src/device/dram/Makefile.inc
+++ b/src/device/dram/Makefile.inc
@@ -1 +1 @@
-romstage-y += ddr3.c ddr2.c
+romstage-y += ddr4.c ddr3.c ddr2.c ddr_common.c
diff --git a/src/device/dram/ddr2.c b/src/device/dram/ddr2.c
index 60588b880b..d66b576623 100644
--- a/src/device/dram/ddr2.c
+++ b/src/device/dram/ddr2.c
@@ -93,7 +93,7 @@ u16 spd_ddr2_calc_unique_crc(const u8 *spd, int len)
for (i = 93; i <= 98; i++)
id_bytes[j++] = spd[i];
- return ddr3_crc16(id_bytes, 15);
+ return ddr_crc16(id_bytes, 15);
}
/**
diff --git a/src/device/dram/ddr3.c b/src/device/dram/ddr3.c
index 834dc83db6..4a900fab47 100644
--- a/src/device/dram/ddr3.c
+++ b/src/device/dram/ddr3.c
@@ -23,6 +23,7 @@
#include <console/console.h>
#include <device/device.h>
#include <device/dram/ddr3.h>
+#include <device/dram/common.h>
#include <string.h>
#include <memory_info.h>
#include <cbmem.h>
@@ -50,24 +51,6 @@ int spd_dimm_is_registered_ddr3(enum spd_dimm_type type)
return 0;
}
-u16 ddr3_crc16(const u8 *ptr, int n_crc)
-{
- int i;
- u16 crc = 0;
-
- while (--n_crc >= 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;
-}
-
/**
* \brief Calculate the CRC of a DDR3 SPD
*
@@ -91,7 +74,7 @@ u16 spd_ddr3_calc_crc(u8 *spd, int len)
/* Not enough bytes available to get the CRC */
return 0;
- return ddr3_crc16(spd, n_crc);
+ return ddr_crc16(spd, n_crc);
}
/**
@@ -108,7 +91,7 @@ u16 spd_ddr3_calc_unique_crc(u8 *spd, int len)
/* Not enough bytes available to get the CRC */
return 0;
- return ddr3_crc16(&spd[117], 11);
+ return ddr_crc16(&spd[117], 11);
}
/**
diff --git a/src/device/dram/ddr4.c b/src/device/dram/ddr4.c
new file mode 100644
index 0000000000..5927b41281
--- /dev/null
+++ b/src/device/dram/ddr4.c
@@ -0,0 +1,248 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2019 Facebook, Inc.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <console/console.h>
+#include <cbmem.h>
+#include <device/device.h>
+#include <device/dram/ddr4.h>
+#include <string.h>
+#include <memory_info.h>
+#include <smbios.h>
+#include <types.h>
+
+typedef enum {
+ BLOCK_0, /* Base Configuration and DRAM Parameters */
+ BLOCK_1,
+ BLOCK_1_L, /* Standard Module Parameters */
+ BLOCK_1_H, /* Hybrid Module Parameters */
+ BLOCK_2,
+ BLOCK_2_L, /* Hybrid Module Extended Function Parameters */
+ BLOCK_2_H, /* Manufacturing Information */
+ BLOCK_3 /* End user programmable */
+} spd_block_type;
+
+typedef struct {
+ spd_block_type type;
+ uint16_t start; /* starting offset from beginning of the spd */
+ uint16_t len; /* size of the block */
+ uint16_t crc_start; /* offset from start of crc bytes, 0 if none */
+} spd_block;
+
+/* 'SPD contents architecture' as per datasheet */
+const spd_block spd_blocks[] = {
+ {.type = BLOCK_0, 0, 128, 126}, {.type = BLOCK_1, 128, 128, 126},
+ {.type = BLOCK_1_L, 128, 64, 0}, {.type = BLOCK_1_H, 192, 64, 0},
+ {.type = BLOCK_2_L, 256, 64, 62}, {.type = BLOCK_2_H, 320, 64, 0},
+ {.type = BLOCK_3, 384, 128, 0} };
+
+static bool verify_block(const spd_block *block, spd_raw_data spd)
+{
+ uint16_t crc, spd_crc;
+
+ spd_crc = (spd[block->start + block->crc_start + 1] << 8)
+ | spd[block->start + block->crc_start];
+ crc = ddr_crc16(&spd[block->start], block->len - 2);
+
+ return spd_crc == crc;
+}
+
+/* Check if given block is 'reserved' for a given module type */
+static bool block_exists(spd_block_type type, u8 dimm_type)
+{
+ bool is_hybrid;
+
+ switch (type) {
+ case BLOCK_0: /* fall-through */
+ case BLOCK_1: /* fall-through */
+ case BLOCK_1_L: /* fall-through */
+ case BLOCK_1_H: /* fall-through */
+ case BLOCK_2_H: /* fall-through */
+ case BLOCK_3: /* fall-through */
+ return true;
+ case BLOCK_2_L:
+ is_hybrid = (dimm_type >> 4) & ((1 << 3) - 1);
+ if (is_hybrid)
+ return true;
+ return false;
+ default: /* fall-through */
+ return false;
+ }
+}
+
+
+/**
+ * \brief Decode the raw SPD data
+ *
+ * Decodes a raw SPD data from a DDR4 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.
+ *
+ * @return @ref spd_status enumerator
+ * SPD_STATUS_OK -- decoding was successful
+ * SPD_STATUS_INVALID -- invalid SPD or not a DDR4 SPD
+ * SPD_STATUS_CRC_ERROR -- checksum mismatch
+ */
+int spd_decode_ddr4(dimm_attr *dimm, spd_raw_data spd)
+{
+ u8 reg8;
+ u8 bus_width, sdram_width;
+ u16 cap_per_die_mbit;
+ u16 spd_bytes_total, spd_bytes_used;
+ const uint16_t spd_bytes_used_table[] = {0, 128, 256, 384, 512};
+
+ /* Make sure that the SPD dump is indeed from a DDR4 module */
+ if (spd[2] != SPD_MEMORY_TYPE_DDR4_SDRAM) {
+ printk(BIOS_ERR, "Not a DDR4 SPD!\n");
+ dimm->dram_type = SPD_MEMORY_TYPE_UNDEFINED;
+ return SPD_STATUS_INVALID;
+ }
+
+ spd_bytes_total = (spd[0] >> 4) & ((1 << 3) - 1);
+ spd_bytes_used = spd[0] & ((1 << 4) - 1);
+
+ if (!spd_bytes_total || !spd_bytes_used) {
+ printk(BIOS_ERR, "SPD failed basic sanity checks\n");
+ return SPD_STATUS_INVALID;
+ }
+
+ spd_bytes_total = 256 << (spd_bytes_total - 1);
+ spd_bytes_used = spd_bytes_used_table[spd_bytes_used];
+
+ /* Verify CRC of blocks that have them, do not step over 'used' length */
+ for (int i = 0; i < ARRAY_SIZE(spd_blocks); i++) {
+ /* this block is not checksumed */
+ if (spd_blocks[i].crc_start == 0)
+ continue;
+ /* we shouldn't have this block */
+ if (spd_blocks[i].start + spd_blocks[i].len > spd_bytes_used)
+ continue;
+ /* check if block exists in the current schema */
+ if (!block_exists(spd_blocks[i].type, spd[3]))
+ continue;
+ if (!verify_block(&spd_blocks[i], spd)) {
+ printk(BIOS_ERR, "CRC failed for block %d\n", i);
+ return SPD_STATUS_CRC_ERROR;
+ }
+ }
+
+ dimm->dram_type = SPD_MEMORY_TYPE_DDR4_SDRAM;
+ dimm->dimm_type = spd[3] & ((1 << 4) - 1);
+
+ reg8 = spd[13] & ((1 << 4) - 1);
+ dimm->bus_width = reg8;
+ bus_width = 8 << (reg8 & ((1 << 3) - 1));
+
+ reg8 = spd[12] & ((1 << 3) - 1);
+ dimm->sdram_width = reg8;
+ sdram_width = 4 << reg8;
+
+ reg8 = spd[4] & ((1 << 4) - 1);
+ dimm->cap_per_die_mbit = reg8;
+ cap_per_die_mbit = (1 << reg8) * 256;
+
+ reg8 = (spd[12] >> 3) & ((1 << 3) - 1);
+ dimm->ranks = reg8 + 1;
+
+ if (!bus_width || !sdram_width) {
+ printk(BIOS_ERR, "SPD information is invalid");
+ dimm->size_mb = 0;
+ return SPD_STATUS_INVALID;
+ }
+
+ /* seems to be only one, in mV */
+ dimm->vdd_voltage = 1200;
+
+ /* calculate size */
+ dimm->size_mb = cap_per_die_mbit / 8 * bus_width / sdram_width * dimm->ranks;
+
+ /* make sure we have the manufacturing information block */
+ if (spd_bytes_used > 320) {
+ dimm->manufacturer_id = (spd[351] << 8) | spd[350];
+ memcpy(dimm->part_number, &spd[329], SPD_DDR4_PART_LEN);
+ dimm->part_number[SPD_DDR4_PART_LEN] = 0;
+ memcpy(dimm->serial_number, &spd[325], sizeof(dimm->serial_number));
+ }
+ return SPD_STATUS_OK;
+}
+
+enum cb_err spd_add_smbios17_ddr4(const u8 channel, const u8 slot, const u16 selected_freq,
+ const dimm_attr *info)
+{
+ struct memory_info *mem_info;
+ struct dimm_info *dimm;
+
+ /*
+ * Allocate CBMEM area for DIMM information used to populate SMBIOS
+ * table 17
+ */
+ mem_info = cbmem_find(CBMEM_ID_MEMINFO);
+ if (!mem_info) {
+ mem_info = cbmem_add(CBMEM_ID_MEMINFO, sizeof(*mem_info));
+
+ printk(BIOS_DEBUG, "CBMEM entry for DIMM info: 0x%p\n", mem_info);
+ if (!mem_info)
+ return CB_ERR;
+
+ memset(mem_info, 0, sizeof(*mem_info));
+ }
+
+ if (mem_info->dimm_cnt >= ARRAY_SIZE(mem_info->dimm)) {
+ printk(BIOS_WARNING, "BUG: Too many DIMM infos for %s.\n", __func__);
+ return CB_ERR;
+ }
+
+ dimm = &mem_info->dimm[mem_info->dimm_cnt];
+ if (info->size_mb) {
+ dimm->ddr_type = MEMORY_TYPE_DDR4;
+ dimm->ddr_frequency = selected_freq;
+ dimm->dimm_size = info->size_mb;
+ dimm->channel_num = channel;
+ dimm->rank_per_dimm = info->ranks;
+ dimm->dimm_num = slot;
+ memcpy(dimm->module_part_number, info->part_number, SPD_DDR4_PART_LEN);
+ dimm->mod_id = info->manufacturer_id;
+
+ switch (info->dimm_type) {
+ case SPD_DIMM_TYPE_SO_DIMM:
+ dimm->mod_type = SPD_SODIMM;
+ break;
+ case SPD_DIMM_TYPE_72B_SO_RDIMM:
+ dimm->mod_type = SPD_72B_SO_RDIMM;
+ break;
+ case SPD_DIMM_TYPE_UDIMM:
+ dimm->mod_type = SPD_UDIMM;
+ break;
+ case SPD_DIMM_TYPE_RDIMM:
+ dimm->mod_type = SPD_RDIMM;
+ break;
+ default:
+ dimm->mod_type = SPD_UNDEFINED;
+ break;
+ }
+
+ dimm->bus_width = info->bus_width;
+ memcpy(dimm->serial, info->serial_number,
+ MIN(sizeof(dimm->serial), sizeof(info->serial_number)));
+
+ dimm->vdd_voltage = info->vdd_voltage;
+ mem_info->dimm_cnt++;
+ }
+
+ return CB_SUCCESS;
+}
diff --git a/src/device/dram/ddr_common.c b/src/device/dram/ddr_common.c
new file mode 100644
index 0000000000..eb36bf52a0
--- /dev/null
+++ b/src/device/dram/ddr_common.c
@@ -0,0 +1,43 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2019 Facebook, Inc.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <console/console.h>
+#include <device/dram/common.h>
+#include <types.h>
+
+/**
+ * \brief Calculate the CRC of a DDR SPD data
+ *
+ * @param spd pointer to raw SPD data
+ * @param len length of data in SPD
+ *
+ * @return the CRC of the SPD data
+ */
+u16 ddr_crc16(const u8 *ptr, int n_crc)
+{
+ int i;
+ u16 crc = 0;
+
+ while (--n_crc >= 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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 11:20:21 +0000