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