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author | Renaud Barbier <renaud.barbier@ge.com> | 2013-06-26 18:33:40 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2013-06-27 08:38:04 +0200 |
commit | e06aa069652c99f5951f2e89a3af952aa484a3bc (patch) | |
tree | c258eedae2efacc1df1143d1bf10cccfed2c639b /include/ddr_spd.h | |
parent | 9bd04c9adb6f0adaf408773d114d0f183e8f6943 (diff) | |
download | barebox-e06aa069652c99f5951f2e89a3af952aa484a3bc.tar.gz |
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 <renaud.barbier@ge.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/ddr_spd.h')
-rw-r--r-- | include/ddr_spd.h | 135 |
1 files changed, 135 insertions, 0 deletions
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_ */ |