1 /* 2 * Copyright 2013 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 or later 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 <fsl_ddr_sdram.h> 14 #include <fsl_ddr_dimm_params.h> 15 #include <asm/fsl_law.h> 16 #include "ddr.h" 17 18 DECLARE_GLOBAL_DATA_PTR; 19 20 void fsl_ddr_board_options(memctl_options_t *popts, 21 dimm_params_t *pdimm, 22 unsigned int ctrl_num) 23 { 24 const struct board_specific_parameters *pbsp, *pbsp_highest = NULL; 25 ulong ddr_freq; 26 27 if (ctrl_num > 1) { 28 printf("Not supported controller number %d\n", ctrl_num); 29 return; 30 } 31 if (!pdimm->n_ranks) 32 return; 33 34 /* 35 * we use identical timing for all slots. If needed, change the code 36 * to pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num]; 37 */ 38 if (popts->registered_dimm_en) 39 pbsp = rdimms[0]; 40 else 41 pbsp = udimms[0]; 42 43 /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr 44 * freqency and n_banks specified in board_specific_parameters table. 45 */ 46 ddr_freq = get_ddr_freq(0) / 1000000; 47 while (pbsp->datarate_mhz_high) { 48 if (pbsp->n_ranks == pdimm->n_ranks && 49 (pdimm->rank_density >> 30) >= pbsp->rank_gb) { 50 if (ddr_freq <= pbsp->datarate_mhz_high) { 51 popts->clk_adjust = pbsp->clk_adjust; 52 popts->wrlvl_start = pbsp->wrlvl_start; 53 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; 54 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; 55 goto found; 56 } 57 pbsp_highest = pbsp; 58 } 59 pbsp++; 60 } 61 62 if (pbsp_highest) { 63 printf("Error: board specific timing not found"); 64 printf("for data rate %lu MT/s\n", ddr_freq); 65 printf("Trying to use the highest speed (%u) parameters\n", 66 pbsp_highest->datarate_mhz_high); 67 popts->clk_adjust = pbsp_highest->clk_adjust; 68 popts->wrlvl_start = pbsp_highest->wrlvl_start; 69 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; 70 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; 71 } else { 72 panic("DIMM is not supported by this board"); 73 } 74 found: 75 debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n" 76 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, " 77 "wrlvl_ctrl_3 0x%x\n", 78 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb, 79 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2, 80 pbsp->wrlvl_ctl_3); 81 82 /* 83 * Factors to consider for half-strength driver enable: 84 * - number of DIMMs installed 85 */ 86 popts->half_strength_driver_enable = 0; 87 /* 88 * Write leveling override 89 */ 90 popts->wrlvl_override = 1; 91 popts->wrlvl_sample = 0xf; 92 93 /* 94 * Rtt and Rtt_WR override 95 */ 96 popts->rtt_override = 0; 97 98 /* Enable ZQ calibration */ 99 popts->zq_en = 1; 100 101 /* DHC_EN =1, ODT = 75 Ohm */ 102 popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm); 103 popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm); 104 } 105 106 phys_size_t initdram(int board_type) 107 { 108 phys_size_t dram_size; 109 110 puts("Initializing....using SPD\n"); 111 112 dram_size = fsl_ddr_sdram(); 113 114 dram_size = setup_ddr_tlbs(dram_size / 0x100000); 115 dram_size *= 0x100000; 116 117 puts(" DDR: "); 118 return dram_size; 119 } 120