1 /* 2 * Copyright 2013 Freescale Semiconductor, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0 5 */ 6 7 #include <common.h> 8 #include <i2c.h> 9 #include <hwconfig.h> 10 #include <asm/mmu.h> 11 #include <fsl_ddr_sdram.h> 12 #include <fsl_ddr_dimm_params.h> 13 #include <asm/fsl_law.h> 14 #include "ddr.h" 15 16 DECLARE_GLOBAL_DATA_PTR; 17 18 void fsl_ddr_board_options(memctl_options_t *popts, 19 dimm_params_t *pdimm, 20 unsigned int ctrl_num) 21 { 22 const struct board_specific_parameters *pbsp, *pbsp_highest = NULL; 23 ulong ddr_freq; 24 25 if (ctrl_num > 1) { 26 printf("Not supported controller number %d\n", ctrl_num); 27 return; 28 } 29 if (!pdimm->n_ranks) 30 return; 31 32 /* 33 * we use identical timing for all slots. If needed, change the code 34 * to pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num]; 35 */ 36 if (popts->registered_dimm_en) 37 pbsp = rdimms[0]; 38 else 39 pbsp = udimms[0]; 40 41 /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr 42 * freqency and n_banks specified in board_specific_parameters table. 43 */ 44 ddr_freq = get_ddr_freq(0) / 1000000; 45 while (pbsp->datarate_mhz_high) { 46 if (pbsp->n_ranks == pdimm->n_ranks && 47 (pdimm->rank_density >> 30) >= pbsp->rank_gb) { 48 if (ddr_freq <= pbsp->datarate_mhz_high) { 49 popts->clk_adjust = pbsp->clk_adjust; 50 popts->wrlvl_start = pbsp->wrlvl_start; 51 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; 52 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; 53 goto found; 54 } 55 pbsp_highest = pbsp; 56 } 57 pbsp++; 58 } 59 60 if (pbsp_highest) { 61 printf("Error: board specific timing not found"); 62 printf("for data rate %lu MT/s\n", ddr_freq); 63 printf("Trying to use the highest speed (%u) parameters\n", 64 pbsp_highest->datarate_mhz_high); 65 popts->clk_adjust = pbsp_highest->clk_adjust; 66 popts->wrlvl_start = pbsp_highest->wrlvl_start; 67 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; 68 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; 69 } else { 70 panic("DIMM is not supported by this board"); 71 } 72 found: 73 debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n" 74 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, " 75 "wrlvl_ctrl_3 0x%x\n", 76 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb, 77 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2, 78 pbsp->wrlvl_ctl_3); 79 80 /* 81 * Factors to consider for half-strength driver enable: 82 * - number of DIMMs installed 83 */ 84 popts->half_strength_driver_enable = 0; 85 /* 86 * Write leveling override 87 */ 88 popts->wrlvl_override = 1; 89 popts->wrlvl_sample = 0xf; 90 91 /* 92 * Rtt and Rtt_WR override 93 */ 94 popts->rtt_override = 0; 95 96 /* Enable ZQ calibration */ 97 popts->zq_en = 1; 98 99 /* DHC_EN =1, ODT = 75 Ohm */ 100 popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm); 101 popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm); 102 103 /* optimize cpo for erratum A-009942 */ 104 popts->cpo_sample = 0x64; 105 } 106 107 int dram_init(void) 108 { 109 phys_size_t dram_size; 110 111 #if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_RAMBOOT_PBL) 112 puts("Initializing....using SPD\n"); 113 dram_size = fsl_ddr_sdram(); 114 #else 115 /* DDR has been initialised by first stage boot loader */ 116 dram_size = fsl_ddr_sdram_size(); 117 #endif 118 dram_size = setup_ddr_tlbs(dram_size / 0x100000); 119 dram_size *= 0x100000; 120 121 gd->ram_size = dram_size; 122 123 return 0; 124 } 125