1 /* 2 * Copyright 2008 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 as published by the Free Software Foundation. 7 */ 8 9 #include <common.h> 10 #include <i2c.h> 11 12 #include <asm/fsl_ddr_sdram.h> 13 #include <asm/fsl_ddr_dimm_params.h> 14 15 static void 16 get_spd(ddr2_spd_eeprom_t *spd, unsigned char i2c_address) 17 { 18 i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr2_spd_eeprom_t)); 19 } 20 21 unsigned int fsl_ddr_get_mem_data_rate(void) 22 { 23 return get_bus_freq(0); 24 } 25 26 void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd, 27 unsigned int ctrl_num) 28 { 29 unsigned int i; 30 unsigned int i2c_address = 0; 31 32 for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) { 33 if (ctrl_num == 0 && i == 0) { 34 i2c_address = SPD_EEPROM_ADDRESS1; 35 } 36 get_spd(&(ctrl_dimms_spd[i]), i2c_address); 37 } 38 } 39 40 void fsl_ddr_board_options(memctl_options_t *popts, 41 dimm_params_t *pdimm, 42 unsigned int ctrl_num) 43 { 44 /* 45 * Factors to consider for clock adjust: 46 * - number of chips on bus 47 * - position of slot 48 * - DDR1 vs. DDR2? 49 * - ??? 50 * 51 * This needs to be determined on a board-by-board basis. 52 * 0110 3/4 cycle late 53 * 0111 7/8 cycle late 54 */ 55 popts->clk_adjust = 7; 56 57 /* 58 * Factors to consider for CPO: 59 * - frequency 60 * - ddr1 vs. ddr2 61 */ 62 popts->cpo_override = 10; 63 64 /* 65 * Factors to consider for write data delay: 66 * - number of DIMMs 67 * 68 * 1 = 1/4 clock delay 69 * 2 = 1/2 clock delay 70 * 3 = 3/4 clock delay 71 * 4 = 1 clock delay 72 * 5 = 5/4 clock delay 73 * 6 = 3/2 clock delay 74 */ 75 popts->write_data_delay = 3; 76 77 /* 2T timing enable */ 78 popts->twoT_en = 1; 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