1 /* 2 * Copyright 2014 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 pbsp = udimms[0]; 33 34 /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr 35 * freqency and n_banks specified in board_specific_parameters table. 36 */ 37 ddr_freq = get_ddr_freq(0) / 1000000; 38 while (pbsp->datarate_mhz_high) { 39 if (pbsp->n_ranks == pdimm->n_ranks && 40 (pdimm->rank_density >> 30) >= pbsp->rank_gb) { 41 if (ddr_freq <= pbsp->datarate_mhz_high) { 42 popts->clk_adjust = pbsp->clk_adjust; 43 popts->wrlvl_start = pbsp->wrlvl_start; 44 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; 45 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; 46 goto found; 47 } 48 pbsp_highest = pbsp; 49 } 50 pbsp++; 51 } 52 53 if (pbsp_highest) { 54 printf("Error: board specific timing not found"); 55 printf("for data rate %lu MT/s\n", ddr_freq); 56 printf("Trying to use the highest speed (%u) parameters\n", 57 pbsp_highest->datarate_mhz_high); 58 popts->clk_adjust = pbsp_highest->clk_adjust; 59 popts->wrlvl_start = pbsp_highest->wrlvl_start; 60 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; 61 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; 62 } else { 63 panic("DIMM is not supported by this board"); 64 } 65 found: 66 debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n" 67 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, " 68 "wrlvl_ctrl_3 0x%x\n", 69 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb, 70 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2, 71 pbsp->wrlvl_ctl_3); 72 73 /* 74 * Factors to consider for half-strength driver enable: 75 * - number of DIMMs installed 76 */ 77 popts->half_strength_driver_enable = 0; 78 /* 79 * Write leveling override 80 */ 81 popts->wrlvl_override = 1; 82 popts->wrlvl_sample = 0xf; 83 84 /* 85 * Rtt and Rtt_WR override 86 */ 87 popts->rtt_override = 0; 88 89 /* Enable ZQ calibration */ 90 popts->zq_en = 1; 91 92 /* DHC_EN =1, ODT = 75 Ohm */ 93 popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm); 94 popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm); 95 96 /* optimize cpo for erratum A-009942 */ 97 popts->cpo_sample = 0x54; 98 } 99 100 int dram_init(void) 101 { 102 phys_size_t dram_size; 103 104 #if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_RAMBOOT_PBL) 105 puts("Initializing....using SPD\n"); 106 dram_size = fsl_ddr_sdram(); 107 #else 108 /* DDR has been initialised by first stage boot loader */ 109 dram_size = fsl_ddr_sdram_size(); 110 #endif 111 dram_size = setup_ddr_tlbs(dram_size / 0x100000); 112 dram_size *= 0x100000; 113 114 gd->ram_size = dram_size; 115 116 return 0; 117 } 118