2 * Copyright 2008-2014 Freescale Semiconductor, Inc.
4 * SPDX-License-Identifier: GPL-2.0
7 #ifndef DDR2_DIMM_PARAMS_H
8 #define DDR2_DIMM_PARAMS_H
10 #define EDC_DATA_PARITY 1
12 #define EDC_AC_PARITY 4
14 /* Parameters for a DDR dimm computed from the SPD */
15 typedef struct dimm_params_s {
17 /* DIMM organization parameters */
18 char mpart[19]; /* guaranteed null terminated */
21 unsigned long long rank_density;
22 unsigned long long capacity;
23 unsigned int data_width;
24 unsigned int primary_sdram_width;
25 unsigned int ec_sdram_width;
26 unsigned int registered_dimm;
27 unsigned int device_width; /* x4, x8, x16 components */
29 /* SDRAM device parameters */
30 unsigned int n_row_addr;
31 unsigned int n_col_addr;
32 unsigned int edc_config; /* 0 = none, 1 = parity, 2 = ECC */
33 #ifdef CONFIG_SYS_FSL_DDR4
34 unsigned int bank_addr_bits;
35 unsigned int bank_group_bits;
37 unsigned int n_banks_per_sdram_device;
39 unsigned int burst_lengths_bitmask; /* BL=4 bit 2, BL=8 = bit 3 */
40 unsigned int row_density;
42 /* used in computing base address of DIMMs */
43 unsigned long long base_address;
45 unsigned int mirrored_dimm; /* only for ddr3 */
47 /* DIMM timing parameters */
49 int mtb_ps; /* medium timebase ps */
50 int ftb_10th_ps; /* fine timebase, in 1/10 ps */
51 int taa_ps; /* minimum CAS latency time */
52 int tfaw_ps; /* four active window delay */
56 * The range for these are 1000-10000 so a short should be sufficient
59 int tckmin_x_minus_1_ps;
60 int tckmin_x_minus_2_ps;
63 /* SPD-defined CAS latencies */
64 unsigned int caslat_x;
65 unsigned int caslat_x_minus_1;
66 unsigned int caslat_x_minus_2;
68 unsigned int caslat_lowest_derated; /* Derated CAS latency */
70 /* basic timing parameters */
75 #ifdef CONFIG_SYS_FSL_DDR4
83 int twr_ps; /* maximum = 63750 ps */
84 int trfc_ps; /* max = 255 ns + 256 ns + .75 ns
86 int trrd_ps; /* maximum = 63750 ps */
87 int twtr_ps; /* maximum = 63750 ps */
88 int trtp_ps; /* byte 38, spd->trtp */
91 int trc_ps; /* maximum = 254 ns + .75 ns = 254750 ps */
96 #if defined(CONFIG_SYS_FSL_DDR1) || defined(CONFIG_SYS_FSL_DDR2)
97 int tis_ps; /* byte 32, spd->ca_setup */
98 int tih_ps; /* byte 33, spd->ca_hold */
99 int tds_ps; /* byte 34, spd->data_setup */
100 int tdh_ps; /* byte 35, spd->data_hold */
101 int tdqsq_max_ps; /* byte 44, spd->tdqsq */
102 int tqhs_ps; /* byte 45, spd->tqhs */
106 unsigned char rcw[16]; /* Register Control Word 0-15 */
107 #ifdef CONFIG_SYS_FSL_DDR4
108 unsigned int dq_mapping[18];
109 unsigned int dq_mapping_ors;
113 unsigned int ddr_compute_dimm_parameters(const unsigned int ctrl_num,
114 const generic_spd_eeprom_t *spd,
115 dimm_params_t *pdimm,
116 unsigned int dimm_number);