| /* |
| * 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 DDR2_DIMM_PARAMS_H |
| #define DDR2_DIMM_PARAMS_H |
| |
| /* Parameters for a DDR2 dimm computed from the SPD */ |
| typedef struct dimm_params_s { |
| |
| /* DIMM organization parameters */ |
| char mpart[19]; /* guaranteed null terminated */ |
| |
| unsigned int n_ranks; |
| unsigned long long rank_density; |
| unsigned long long capacity; |
| unsigned int data_width; |
| unsigned int primary_sdram_width; |
| unsigned int ec_sdram_width; |
| unsigned int registered_dimm; |
| |
| /* SDRAM device parameters */ |
| unsigned int n_row_addr; |
| unsigned int n_col_addr; |
| unsigned int edc_config; /* 0 = none, 1 = parity, 2 = ECC */ |
| unsigned int n_banks_per_sdram_device; |
| unsigned int burst_lengths_bitmask; /* BL=4 bit 2, BL=8 = bit 3 */ |
| unsigned int row_density; |
| |
| /* used in computing base address of DIMMs */ |
| unsigned long long base_address; |
| /* mirrored DIMMs */ |
| unsigned int mirrored_dimm; /* only for ddr3 */ |
| |
| /* DIMM timing parameters */ |
| |
| unsigned int mtb_ps; /* medium timebase ps, only for ddr3 */ |
| unsigned int tAA_ps; /* minimum CAS latency time, only for ddr3 */ |
| unsigned int tFAW_ps; /* four active window delay, only for ddr3 */ |
| |
| /* |
| * SDRAM clock periods |
| * The range for these are 1000-10000 so a short should be sufficient |
| */ |
| unsigned int tCKmin_X_ps; |
| unsigned int tCKmin_X_minus_1_ps; |
| unsigned int tCKmin_X_minus_2_ps; |
| unsigned int tCKmax_ps; |
| |
| /* SPD-defined CAS latencies */ |
| unsigned int caslat_X; |
| unsigned int caslat_X_minus_1; |
| unsigned int caslat_X_minus_2; |
| |
| unsigned int caslat_lowest_derated; /* Derated CAS latency */ |
| |
| /* basic timing parameters */ |
| unsigned int tRCD_ps; |
| unsigned int tRP_ps; |
| unsigned int tRAS_ps; |
| |
| unsigned int tWR_ps; /* maximum = 63750 ps */ |
| unsigned int tWTR_ps; /* maximum = 63750 ps */ |
| unsigned int tRFC_ps; /* max = 255 ns + 256 ns + .75 ns |
| = 511750 ps */ |
| |
| unsigned int tRRD_ps; /* maximum = 63750 ps */ |
| unsigned int tRC_ps; /* maximum = 254 ns + .75 ns = 254750 ps */ |
| |
| unsigned int refresh_rate_ps; |
| |
| /* DDR3 doesn't need these as below */ |
| unsigned int tIS_ps; /* byte 32, spd->ca_setup */ |
| unsigned int tIH_ps; /* byte 33, spd->ca_hold */ |
| unsigned int tDS_ps; /* byte 34, spd->data_setup */ |
| unsigned int tDH_ps; /* byte 35, spd->data_hold */ |
| unsigned int tRTP_ps; /* byte 38, spd->trtp */ |
| unsigned int tDQSQ_max_ps; /* byte 44, spd->tdqsq */ |
| unsigned int tQHS_ps; /* byte 45, spd->tqhs */ |
| } dimm_params_t; |
| |
| extern unsigned int ddr_compute_dimm_parameters( |
| const generic_spd_eeprom_t *spd, |
| dimm_params_t *pdimm, |
| unsigned int dimm_number); |
| |
| #endif |
