1 /* 2 * Copyright 2008 Freescale Semiconductor, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0 5 */ 6 7 #include <common.h> 8 9 #include <fsl_ddr_sdram.h> 10 #include <fsl_ddr_dimm_params.h> 11 12 void fsl_ddr_board_options(memctl_options_t *popts, 13 dimm_params_t *pdimm, 14 unsigned int ctrl_num) 15 { 16 /* 17 * Factors to consider for clock adjust: 18 * - number of chips on bus 19 * - position of slot 20 * - DDR1 vs. DDR2? 21 * - ??? 22 * 23 * This needs to be determined on a board-by-board basis. 24 * 0110 3/4 cycle late 25 * 0111 7/8 cycle late 26 */ 27 popts->clk_adjust = 7; 28 29 /* 30 * Factors to consider for CPO: 31 * - frequency 32 * - ddr1 vs. ddr2 33 */ 34 popts->cpo_override = 10; 35 36 /* 37 * Factors to consider for write data delay: 38 * - number of DIMMs 39 * 40 * 1 = 1/4 clock delay 41 * 2 = 1/2 clock delay 42 * 3 = 3/4 clock delay 43 * 4 = 1 clock delay 44 * 5 = 5/4 clock delay 45 * 6 = 3/2 clock delay 46 */ 47 popts->write_data_delay = 3; 48 49 /* 2T timing enable */ 50 popts->twot_en = 1; 51 52 /* 53 * Factors to consider for half-strength driver enable: 54 * - number of DIMMs installed 55 */ 56 popts->half_strength_driver_enable = 0; 57 } 58