1 /* 2 * Copyright 2011 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 #include <i2c.h> 11 #include <hwconfig.h> 12 #include <asm/mmu.h> 13 #include <asm/fsl_ddr_sdram.h> 14 #include <asm/fsl_ddr_dimm_params.h> 15 #include <asm/fsl_law.h> 16 17 struct board_specific_parameters { 18 u32 n_ranks; 19 u32 datarate_mhz_high; 20 u32 clk_adjust; 21 u32 wrlvl_start; 22 u32 cpo; 23 u32 write_data_delay; 24 u32 force_2T; 25 }; 26 27 /* 28 * This table contains all valid speeds we want to override with board 29 * specific parameters. datarate_mhz_high values need to be in ascending order 30 * for each n_ranks group. 31 * 32 * ranges for parameters: 33 * wr_data_delay = 0-6 34 * clk adjust = 0-8 35 * cpo 2-0x1E (30) 36 */ 37 static const struct board_specific_parameters dimm0[] = { 38 /* 39 * memory controller 0 40 * num| hi| clk| wrlvl | cpo |wrdata|2T 41 * ranks| mhz|adjst| start | delay| 42 */ 43 {2, 750, 3, 5, 0xff, 2, 0}, 44 {2, 1250, 4, 6, 0xff, 2, 0}, 45 {2, 1350, 5, 7, 0xff, 2, 0}, 46 {2, 1666, 5, 8, 0xff, 2, 0}, 47 {} 48 }; 49 50 void fsl_ddr_board_options(memctl_options_t *popts, 51 dimm_params_t *pdimm, 52 unsigned int ctrl_num) 53 { 54 const struct board_specific_parameters *pbsp, *pbsp_highest = NULL; 55 ulong ddr_freq; 56 57 if (ctrl_num) { 58 printf("Wrong parameter for controller number %d", ctrl_num); 59 return; 60 } 61 if (!pdimm->n_ranks) 62 return; 63 64 pbsp = dimm0; 65 66 /* 67 * Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr 68 * freqency and n_banks specified in board_specific_parameters table. 69 */ 70 ddr_freq = get_ddr_freq(0) / 1000000; 71 while (pbsp->datarate_mhz_high) { 72 if (pbsp->n_ranks == pdimm->n_ranks) { 73 if (ddr_freq <= pbsp->datarate_mhz_high) { 74 popts->cpo_override = pbsp->cpo; 75 popts->write_data_delay = 76 pbsp->write_data_delay; 77 popts->clk_adjust = pbsp->clk_adjust; 78 popts->wrlvl_start = pbsp->wrlvl_start; 79 popts->twoT_en = pbsp->force_2T; 80 goto found; 81 } 82 pbsp_highest = pbsp; 83 } 84 pbsp++; 85 } 86 87 if (pbsp_highest) { 88 printf("Error: board specific timing not found " 89 "for data rate %lu MT/s!\n" 90 "Trying to use the highest speed (%u) parameters\n", 91 ddr_freq, pbsp_highest->datarate_mhz_high); 92 popts->cpo_override = pbsp_highest->cpo; 93 popts->write_data_delay = pbsp_highest->write_data_delay; 94 popts->clk_adjust = pbsp_highest->clk_adjust; 95 popts->wrlvl_start = pbsp_highest->wrlvl_start; 96 popts->twoT_en = pbsp_highest->force_2T; 97 } else { 98 panic("DIMM is not supported by this board"); 99 } 100 101 found: 102 /* 103 * Factors to consider for half-strength driver enable: 104 * - number of DIMMs installed 105 */ 106 popts->half_strength_driver_enable = 0; 107 /* Write leveling override */ 108 popts->wrlvl_override = 1; 109 popts->wrlvl_sample = 0xf; 110 111 /* Rtt and Rtt_WR override */ 112 popts->rtt_override = 0; 113 114 /* Enable ZQ calibration */ 115 popts->zq_en = 1; 116 117 /* DHC_EN =1, ODT = 60 Ohm */ 118 popts->ddr_cdr1 = DDR_CDR1_DHC_EN; 119 } 120 121 phys_size_t initdram(int board_type) 122 { 123 phys_size_t dram_size = 0; 124 125 puts("Initializing...."); 126 127 if (fsl_use_spd()) { 128 puts("using SPD\n"); 129 dram_size = fsl_ddr_sdram(); 130 } else { 131 puts("no SPD and fixed parameters\n"); 132 return dram_size; 133 } 134 135 dram_size = setup_ddr_tlbs(dram_size / 0x100000); 136 dram_size *= 0x100000; 137 138 debug(" DDR: "); 139 return dram_size; 140 } 141