1 /* 2 * Copyright 2008 Freescale Semiconductor, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * Version 2 as published by the Free Software Foundation. 7 */ 8 9 #include <common.h> 10 11 #include <asm/fsl_ddr_sdram.h> 12 #include <asm/fsl_ddr_dimm_params.h> 13 14 struct board_specific_parameters { 15 u32 n_ranks; 16 u32 datarate_mhz_high; 17 u32 clk_adjust; 18 u32 cpo; 19 u32 write_data_delay; 20 u32 force_2T; 21 }; 22 23 /* 24 * This table contains all valid speeds we want to override with board 25 * specific parameters. datarate_mhz_high values need to be in ascending order 26 * for each n_ranks group. 27 * 28 * For DDR2 DIMM, all combinations of clk_adjust and write_data_delay have been 29 * tested. For RDIMM, clk_adjust = 4 and write_data_delay = 3 is optimized for 30 * all clocks from 400MT/s to 800MT/s, verified with Kingston KVR800D2D8P6/2G. 31 * For UDIMM, clk_adjust = 8 and write_delay = 5 is optimized for all clocks 32 * from 400MT/s to 800MT/s, verified with Micron MT18HTF25672AY-800E1. 33 * 34 * CPO value doesn't matter if workaround for errata 111 and 134 enabled. 35 */ 36 static const struct board_specific_parameters udimm0[] = { 37 /* 38 * memory controller 0 39 * num| hi| clk| cpo|wrdata|2T 40 * ranks| mhz|adjst| | delay| 41 */ 42 {2, 333, 8, 7, 5, 0}, 43 {2, 400, 8, 9, 5, 0}, 44 {2, 549, 8, 11, 5, 0}, 45 {2, 680, 8, 10, 5, 0}, 46 {2, 850, 8, 12, 5, 1}, 47 {1, 333, 6, 7, 3, 0}, 48 {1, 400, 6, 9, 3, 0}, 49 {1, 549, 6, 11, 3, 0}, 50 {1, 680, 1, 10, 5, 0}, 51 {1, 850, 1, 12, 5, 0}, 52 {} 53 }; 54 55 static const struct board_specific_parameters udimm1[] = { 56 /* 57 * memory controller 1 58 * num| hi| clk| cpo|wrdata|2T 59 * ranks| mhz|adjst| | delay| 60 */ 61 {2, 333, 8, 7, 5, 0}, 62 {2, 400, 8, 9, 5, 0}, 63 {2, 549, 8, 11, 5, 0}, 64 {2, 680, 8, 11, 5, 0}, 65 {2, 850, 8, 13, 5, 1}, 66 {1, 333, 6, 7, 3, 0}, 67 {1, 400, 6, 9, 3, 0}, 68 {1, 549, 6, 11, 3, 0}, 69 {1, 680, 1, 11, 6, 0}, 70 {1, 850, 1, 13, 6, 0}, 71 {} 72 }; 73 74 static const struct board_specific_parameters *udimms[] = { 75 udimm0, 76 udimm1, 77 }; 78 79 static const struct board_specific_parameters rdimm0[] = { 80 /* 81 * memory controller 0 82 * num| hi| clk| cpo|wrdata|2T 83 * ranks| mhz|adjst| | delay| 84 */ 85 {2, 333, 4, 7, 3, 0}, 86 {2, 400, 4, 9, 3, 0}, 87 {2, 549, 4, 11, 3, 0}, 88 {2, 680, 4, 10, 3, 0}, 89 {2, 850, 4, 12, 3, 1}, 90 {} 91 }; 92 93 static const struct board_specific_parameters rdimm1[] = { 94 /* 95 * memory controller 1 96 * num| hi| clk| cpo|wrdata|2T 97 * ranks| mhz|adjst| | delay| 98 */ 99 {2, 333, 4, 7, 3, 0}, 100 {2, 400, 4, 9, 3, 0}, 101 {2, 549, 4, 11, 3, 0}, 102 {2, 680, 4, 11, 3, 0}, 103 {2, 850, 4, 13, 3, 1}, 104 {} 105 }; 106 107 static const struct board_specific_parameters *rdimms[] = { 108 rdimm0, 109 rdimm1, 110 }; 111 112 void fsl_ddr_board_options(memctl_options_t *popts, 113 dimm_params_t *pdimm, 114 unsigned int ctrl_num) 115 { 116 const struct board_specific_parameters *pbsp, *pbsp_highest = NULL; 117 ulong ddr_freq; 118 119 if (ctrl_num > 1) { 120 printf("Wrong parameter for controller number %d", ctrl_num); 121 return; 122 } 123 if (!pdimm->n_ranks) 124 return; 125 126 if (popts->registered_dimm_en) 127 pbsp = rdimms[ctrl_num]; 128 else 129 pbsp = udimms[ctrl_num]; 130 131 /* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr 132 * freqency and n_banks specified in board_specific_parameters table. 133 */ 134 ddr_freq = get_ddr_freq(0) / 1000000; 135 while (pbsp->datarate_mhz_high) { 136 if (pbsp->n_ranks == pdimm->n_ranks) { 137 if (ddr_freq <= pbsp->datarate_mhz_high) { 138 popts->clk_adjust = pbsp->clk_adjust; 139 popts->cpo_override = pbsp->cpo; 140 popts->write_data_delay = 141 pbsp->write_data_delay; 142 popts->twoT_en = pbsp->force_2T; 143 goto found; 144 } 145 pbsp_highest = pbsp; 146 } 147 pbsp++; 148 } 149 150 if (pbsp_highest) { 151 printf("Error: board specific timing not found " 152 "for data rate %lu MT/s!\n" 153 "Trying to use the highest speed (%u) parameters\n", 154 ddr_freq, pbsp_highest->datarate_mhz_high); 155 popts->clk_adjust = pbsp->clk_adjust; 156 popts->cpo_override = pbsp->cpo; 157 popts->write_data_delay = pbsp->write_data_delay; 158 popts->twoT_en = pbsp->force_2T; 159 } else { 160 panic("DIMM is not supported by this board"); 161 } 162 163 found: 164 /* 165 * Factors to consider for half-strength driver enable: 166 * - number of DIMMs installed 167 */ 168 popts->half_strength_driver_enable = 0; 169 } 170