From e06aa069652c99f5951f2e89a3af952aa484a3bc Mon Sep 17 00:00:00 2001 From: Renaud Barbier Date: Wed, 26 Jun 2013 18:33:40 +0100 Subject: common: DDR2 SPD checksum. The code calculates the DDR2 SPD checksum as per JEDEC standard No 21-C Appendix X (revision 1.2) The code is based on the equivalent files from U-Boot version git-a71d45d. Signed-off-by: Renaud Barbier Signed-off-by: Sascha Hauer --- common/Makefile | 1 + common/ddr_spd.c | 39 ++++++++++++++++ include/ddr_spd.h | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 175 insertions(+) create mode 100644 common/ddr_spd.c create mode 100644 include/ddr_spd.h diff --git a/common/Makefile b/common/Makefile index 2f0bd34569..fc23421c3d 100644 --- a/common/Makefile +++ b/common/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_CMD_LOADS) += s_record.o obj-$(CONFIG_OFTREE) += oftree.o obj-y += memory.o +obj-$(CONFIG_DDR_SPD) += ddr_spd.o obj-y += memory_display.o obj-$(CONFIG_MALLOC_DLMALLOC) += dlmalloc.o obj-$(CONFIG_MALLOC_TLSF) += tlsf_malloc.o diff --git a/common/ddr_spd.c b/common/ddr_spd.c new file mode 100644 index 0000000000..c8b73ff56c --- /dev/null +++ b/common/ddr_spd.c @@ -0,0 +1,39 @@ +/* + * Copyright 2008 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 +#include + +uint32_t ddr2_spd_checksum_pass(const struct ddr2_spd_eeprom_s *spd) +{ + uint32_t i, cksum = 0; + const uint8_t *buf = (const uint8_t *)spd; + uint8_t rev, spd_cksum; + + rev = spd->spd_rev; + spd_cksum = spd->cksum; + + /* Rev 1.X or less supported by this code */ + if (rev >= 0x20) + goto error; + + /* + * The checksum is calculated on the first 64 bytes + * of the SPD as per JEDEC specification. + */ + for (i = 0; i < 63; i++) + cksum += *buf++; + cksum &= 0xFF; + + if (cksum != spd_cksum) + goto error; + + return 0; +error: + return 1; +} diff --git a/include/ddr_spd.h b/include/ddr_spd.h new file mode 100644 index 0000000000..c8762a28df --- /dev/null +++ b/include/ddr_spd.h @@ -0,0 +1,135 @@ +/* + * Copyright 2008 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. + */ + +#ifndef _DDR_SPD_H_ +#define _DDR_SPD_H_ + +/* + * Format from "JEDEC Appendix X: Serial Presence Detects for DDR2 SDRAM", + * SPD Revision 1.2 + */ +struct ddr2_spd_eeprom_s { + uint8_t info_size; /* 0 # bytes written into serial memory */ + uint8_t chip_size; /* 1 Total # bytes of SPD memory device */ + uint8_t mem_type; /* 2 Fundamental memory type */ + uint8_t nrow_addr; /* 3 # of Row Addresses on this assembly */ + uint8_t ncol_addr; /* 4 # of Column Addrs on this assembly */ + uint8_t mod_ranks; /* 5 Number of DIMM Ranks */ + uint8_t dataw; /* 6 Module Data Width */ + uint8_t res_7; /* 7 Reserved */ + uint8_t voltage; /* 8 Voltage intf std of this assembly */ + uint8_t clk_cycle; /* 9 SDRAM Cycle time @ CL=X */ + uint8_t clk_access; /* 10 SDRAM Access from Clk @ CL=X (tAC) */ + uint8_t config; /* 11 DIMM Configuration type */ + uint8_t refresh; /* 12 Refresh Rate/Type */ + uint8_t primw; /* 13 Primary SDRAM Width */ + uint8_t ecw; /* 14 Error Checking SDRAM width */ + uint8_t res_15; /* 15 Reserved */ + uint8_t burstl; /* 16 Burst Lengths Supported */ + uint8_t nbanks; /* 17 # of Banks on Each SDRAM Device */ + uint8_t cas_lat; /* 18 CAS# Latencies Supported */ + uint8_t mech_char; /* 19 DIMM Mechanical Characteristics */ + uint8_t dimm_type; /* 20 DIMM type information */ + uint8_t mod_attr; /* 21 SDRAM Module Attributes */ + uint8_t dev_attr; /* 22 SDRAM Device Attributes */ + uint8_t clk_cycle2; /* 23 Min SDRAM Cycle time @ CL=X-1 */ + uint8_t clk_access2; /* 24 SDRAM Access from Clk @ CL=X-1 (tAC) */ + uint8_t clk_cycle3; /* 25 Min SDRAM Cycle time @ CL=X-2 */ + uint8_t clk_access3; /* 26 Max Access from Clk @ CL=X-2 (tAC) */ + uint8_t trp; /* 27 Min Row Precharge Time (tRP)*/ + uint8_t trrd; /* 28 Min Row Active to Row Active (tRRD) */ + uint8_t trcd; /* 29 Min RAS to CAS Delay (tRCD) */ + uint8_t tras; /* 30 Minimum RAS Pulse Width (tRAS) */ + uint8_t rank_dens; /* 31 Density of each rank on module */ + uint8_t ca_setup; /* 32 Addr+Cmd Setup Time Before Clk (tIS) */ + uint8_t ca_hold; /* 33 Addr+Cmd Hold Time After Clk (tIH) */ + uint8_t data_setup; /* 34 Data Input Setup Time Before Strobe + (tDS) */ + uint8_t data_hold; /* 35 Data Input Hold Time + After Strobe (tDH) */ + uint8_t twr; /* 36 Write Recovery time tWR */ + uint8_t twtr; /* 37 Int write to read delay tWTR */ + uint8_t trtp; /* 38 Int read to precharge delay tRTP */ + uint8_t mem_probe; /* 39 Mem analysis probe characteristics */ + uint8_t trctrfc_ext; /* 40 Extensions to trc and trfc */ + uint8_t trc; /* 41 Min Active to Auto refresh time tRC */ + uint8_t trfc; /* 42 Min Auto to Active period tRFC */ + uint8_t tckmax; /* 43 Max device cycle time tCKmax */ + uint8_t tdqsq; /* 44 Max DQS to DQ skew (tDQSQ max) */ + uint8_t tqhs; /* 45 Max Read DataHold skew (tQHS) */ + uint8_t pll_relock; /* 46 PLL Relock time */ + uint8_t Tcasemax; /* 47 Tcasemax */ + uint8_t psiTAdram; /* 48 Thermal Resistance of DRAM Package + from Top (Case) to Ambient + (Psi T-A DRAM) */ + uint8_t dt0_mode; /* 49 DRAM Case Temperature Rise from + Ambient due to Activate-Precharge/Mode + Bits (DT0/Mode Bits) */ + uint8_t dt2n_dt2q; /* 50 DRAM Case Temperature Rise from + Ambient due to Precharge/Quiet Standby + (DT2N/DT2Q) */ + uint8_t dt2p; /* 51 DRAM Case Temperature Rise from + Ambient due to Precharge Power-Down + (DT2P) */ + uint8_t dt3n; /* 52 DRAM Case Temperature Rise from + Ambient due to Active Standby (DT3N) */ + uint8_t dt3pfast; /* 53 DRAM Case Temperature Rise from + Ambient due to Active Power-Down with + Fast PDN Exit (DT3Pfast) */ + uint8_t dt3pslow; /* 54 DRAM Case Temperature Rise from + Ambient due to Active Power-Down with + Slow PDN Exit (DT3Pslow) */ + uint8_t dt4r_dt4r4w; /* 55 DRAM Case Temperature Rise from + Ambient due to Page Open Burst + Read/DT4R4W Mode Bit + (DT4R/DT4R4W Mode Bit) */ + uint8_t dt5b; /* 56 DRAM Case Temperature Rise from + Ambient due to Burst Refresh (DT5B) */ + uint8_t dt7; /* 57 DRAM Case Temperature Rise from + Ambient due to Bank Interleave Reads + with Auto-Precharge (DT7) */ + uint8_t psiTApll; /* 58 Thermal Resistance of PLL Package + form Top (Case) to Ambient + (Psi T-A PLL) */ + uint8_t psiTAreg; /* 59 Thermal Reisitance of Register + Package from Top (Case) to Ambient + (Psi T-A Register) */ + uint8_t dtpllactive; /* 60 PLL Case Temperature Rise from + Ambient due to PLL Active + (DT PLL Active) */ + uint8_t dtregact; /* 61 Register Case Temperature Rise from + Ambient due to Register Active/Mode + Bit (DT Register Active/Mode Bit) */ + uint8_t spd_rev; /* 62 SPD Data Revision Code */ + uint8_t cksum; /* 63 Checksum for bytes 0-62 */ + uint8_t mid[8]; /* 64 Mfr's JEDEC ID code per JEP-106 */ + uint8_t mloc; /* 72 Manufacturing Location */ + uint8_t mpart[18]; /* 73 Manufacturer's Part Number */ + uint8_t rev[2]; /* 91 Revision Code */ + uint8_t mdate[2]; /* 93 Manufacturing Date */ + uint8_t sernum[4]; /* 95 Assembly Serial Number */ + uint8_t mspec[27]; /* 99-127 Manufacturer Specific Data */ + +}; + +extern uint32_t ddr2_spd_checksum_pass(const struct ddr2_spd_eeprom_s *spd); + +/* * Byte 2 Fundamental Memory Types. */ +#define SPD_MEMTYPE_DDR2 (0x08) + +/* DIMM Type for DDR2 SPD (according to v1.3) */ +#define DDR2_SPD_DIMMTYPE_RDIMM (0x01) +#define DDR2_SPD_DIMMTYPE_UDIMM (0x02) +#define DDR2_SPD_DIMMTYPE_SO_DIMM (0x04) +#define DDR2_SPD_DIMMTYPE_72B_SO_CDIMM (0x06) +#define DDR2_SPD_DIMMTYPE_72B_SO_RDIMM (0x07) +#define DDR2_SPD_DIMMTYPE_MICRO_DIMM (0x08) +#define DDR2_SPD_DIMMTYPE_MINI_RDIMM (0x10) +#define DDR2_SPD_DIMMTYPE_MINI_UDIMM (0x20) + +#endif /* _DDR_SPD_H_ */ -- cgit v1.2.3