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authorPatrick Rudolph <siro@das-labor.org>2017-01-31 19:43:17 +0100
committerMartin Roth <martinroth@google.com>2017-03-10 11:17:27 +0100
commit6e53ae6f5c12b70c2a86370f0dd9df37a12c8118 (patch)
treec647451229c70fe79a50bdba06f5359d9413d093 /src/include/device/dram
parent7e4d12c5b12107bb7682e050c66f97000e064ce2 (diff)
downloadcoreboot-6e53ae6f5c12b70c2a86370f0dd9df37a12c8118.tar.xz
device/dram/ddr2: Add common ddr2 spd decoder
Decode DDR2 SPD similar to DDR3 SPD decoder to ease readability, reduce code complexity and reduce size of maintainable code. Rename dimm_is_registered to spd_dimm_is_registered_ddr3 to avoid compilation errors. Change-Id: I741f0e61ab23e3999ae9e31f57228ba034c2509e Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/18273 Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/include/device/dram')
-rw-r--r--src/include/device/dram/ddr2.h218
-rw-r--r--src/include/device/dram/ddr3.h2
2 files changed, 219 insertions, 1 deletions
diff --git a/src/include/device/dram/ddr2.h b/src/include/device/dram/ddr2.h
new file mode 100644
index 0000000000..7f59a7a7c1
--- /dev/null
+++ b/src/include/device/dram/ddr2.h
@@ -0,0 +1,218 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Patrick Rudolph <siro@das-labor.org>
+ *
+ * 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.
+ */
+
+/*
+ * JEDEC Standard No. 21-C
+ * Annex J: Annex J: Serial Presence Detects for DDR2 SDRAM (Revision 1.3)
+ */
+
+#ifndef DEVICE_DRAM_DDR2L_H
+#define DEVICE_DRAM_DDR2L_H
+
+/**
+ * @file ddr2.h
+ *
+ * \brief Utilities for decoding DDR2 SPDs
+ */
+
+#include <stdint.h>
+#include <spd.h>
+
+/**
+ * \brief Convenience definitions for TCK values
+ *
+ * Different values for tCK, representing standard DDR2 frequencies.
+ * These values are in 1/256 ns units.
+ * @{
+ */
+#define TCK_800MHZ 320
+#define TCK_700MHZ 365
+#define TCK_666MHZ 384
+#define TCK_533MHZ 480
+#define TCK_400MHZ 640
+#define TCK_333MHZ 768
+#define TCK_266MHZ 960
+#define TCK_200MHZ 1280
+/** @} */
+
+/**
+ * \brief Convenience macro for enabling printk with CONFIG_DEBUG_RAM_SETUP
+ *
+ * Use this macro instead of printk(); for verbose RAM initialization messages.
+ * When CONFIG_DEBUG_RAM_SETUP is not selected, these messages are automatically
+ * disabled.
+ * @{
+ */
+#if IS_ENABLED(CONFIG_DEBUG_RAM_SETUP)
+#define printram(x, ...) printk(BIOS_DEBUG, x, ##__VA_ARGS__)
+#else
+#define printram(x, ...)
+#endif
+/** @} */
+
+/*
+ * Module type (byte 20, bits 5:0) of SPD
+ * This definition is specific to DDR2. DDR3 SPDs have a different structure.
+ */
+enum spd_dimm_type {
+ SPD_DIMM_TYPE_UNDEFINED = 0x00,
+ SPD_DIMM_TYPE_RDIMM = 0x01,
+ SPD_DIMM_TYPE_UDIMM = 0x02,
+ SPD_DIMM_TYPE_SO_DIMM = 0x04,
+ SPD_DIMM_TYPE_72B_SO_CDIMM = 0x06,
+ SPD_DIMM_TYPE_72B_SO_RDIMM = 0x07,
+ SPD_DIMM_TYPE_MICRO_DIMM = 0x08,
+ SPD_DIMM_TYPE_MINI_DIMM = 0x10,
+ SPD_DIMM_TYPE_MINI_UDIMM = 0x20,
+ /* Masks to bits 5:0 to give the dimm type */
+ SPD_DIMM_TYPE_MASK = 0x3f,
+};
+
+/**
+ * \brief DIMM flags
+ *
+ * Characteristic flags for the DIMM, as presented by the SPD
+ */
+union dimm_flags_st {
+ /* The whole point of the union/struct construct is to allow us to clear
+ * all the bits with one line: flags.raw = 0.
+ * We do not care how these bits are ordered */
+ struct {
+ /* Module can work at 5.00V */
+ unsigned operable_5_00V:1;
+ /* Module can work at 3.33V */
+ unsigned operable_3_33V:1;
+ /* Module can work at 2.50V */
+ unsigned operable_2_50V:1;
+ /* Module can work at 1.80V - All DIMMS must be 1.8V operable */
+ unsigned operable_1_80V:1;
+ /* Module can work at 1.50V */
+ unsigned operable_1_50V:1;
+ /* Module can work at 1.35V */
+ unsigned operable_1_35V:1;
+ /* Module can work at 1.20V */
+ unsigned operable_1_25V:1;
+ /* Has an 8-bit bus extension, meaning the DIMM supports ECC */
+ unsigned is_ecc:1;
+ /* Supports weak driver */
+ unsigned weak_driver:1;
+ /* Supports terminating at 50 Ohm */
+ unsigned terminate_50ohms:1;
+ /* Partial Array Self Refresh */
+ unsigned pasr:1;
+ /* Supports burst length 8 */
+ unsigned bl8:1;
+ /* Supports burst length 4 */
+ unsigned bl4:1;
+ /* DIMM Package is stack */
+ unsigned stacked:1;
+ };
+ unsigned int raw;
+};
+
+/**
+ * \brief DIMM characteristics
+ *
+ * The characteristics of each DIMM, as presented by the SPD
+ */
+struct dimm_attr_st {
+ enum spd_memory_type dram_type;
+ enum spd_dimm_type dimm_type;
+ /* BCD SPD revision */
+ u8 rev;
+ /* Supported CAS mask, bit 0 == CL0 .. bit7 == CL7 */
+ u8 cas_supported;
+ /* Maximum cloclk to data cycle times for various CAS.
+ * Fields 0 and 1 are unused. */
+ u32 cycle_time[8];
+ /* Maximum data access times for various CAS.
+ * Fields 0 and 1 are unused. */
+ u32 access_time[8];
+ /* Flags extracted from SPD */
+ union dimm_flags_st flags;
+ /* Number of banks */
+ u8 banks;
+ /* SDRAM width */
+ u8 width;
+ /* Module width */
+ u8 mod_width;
+ /* Number of ranks */
+ u8 ranks;
+ /* Number or row address bits */
+ u8 row_bits;
+ /* Number or column address bits */
+ u8 col_bits;
+ /* Number of PLLs on module */
+ u8 plls;
+ /* Size of module in MiB */
+ u16 size_mb;
+ /* Size of one rank in MiB */
+ u16 ranksize_mb;
+ /* Latencies are in units of 1/256 ns */
+ u32 tCK;
+ u32 tWR;
+ u32 tRCD;
+ u32 tRRD;
+ u32 tRP;
+ u32 tRAS;
+ u32 tIS;
+ u32 tIH;
+ u32 tDS;
+ u32 tDH;
+
+ u32 tRC;
+ u32 tRFC;
+ u32 tWTR;
+ u32 tRTP;
+ u32 tDQSQ;
+ u32 tQHS;
+
+ /* Latencies are in units of 1/256 us */
+ u32 tPLL;
+ u32 tRR;
+
+ /* Manufacturer ID */
+ u32 manufacturer_id;
+ /* ASCII part number - NULL terminated */
+ u8 part_number[17];
+ /* Year manufactured */
+ u16 year;
+ /* Week manufactured */
+ u8 weeks;
+ /* Unique serial number */
+ u32 serial;
+};
+
+/** Result of the SPD decoding process */
+enum spd_status {
+ SPD_STATUS_OK = 0,
+ SPD_STATUS_INVALID,
+ SPD_STATUS_CRC_ERROR,
+ SPD_STATUS_INVALID_FIELD,
+};
+
+/** Maximum SPD size supported */
+#define SPD_SIZE_MAX_DDR2 128
+
+int spd_dimm_is_registered_ddr2(enum spd_dimm_type type);
+u8 spd_ddr2_calc_checksum(u8 *spd, int len);
+u32 spd_decode_spd_size_ddr2(u8 byte0);
+u32 spd_decode_eeprom_size_ddr2(u8 byte1);
+int spd_decode_ddr2(struct dimm_attr_st *dimm, u8 spd[SPD_SIZE_MAX_DDR2]);
+void dram_print_spd_ddr2(const struct dimm_attr_st *dimm);
+
+
+#endif /* DEVICE_DRAM_DDR2L_H */
diff --git a/src/include/device/dram/ddr3.h b/src/include/device/dram/ddr3.h
index ee20ba793a..7a97bf81f8 100644
--- a/src/include/device/dram/ddr3.h
+++ b/src/include/device/dram/ddr3.h
@@ -201,7 +201,7 @@ typedef u8 spd_raw_data[256];
u16 spd_ddr3_calc_crc(u8 *spd, int len);
u16 spd_ddr3_calc_unique_crc(u8 *spd, int len);
int spd_decode_ddr3(dimm_attr * dimm, spd_raw_data spd_data);
-int dimm_is_registered(enum spd_dimm_type type);
+int spd_dimm_is_registered_ddr3(enum spd_dimm_type type);
void dram_print_spd_ddr3(const dimm_attr * dimm);
int spd_xmp_decode_ddr3(dimm_attr * dimm,
spd_raw_data spd,