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 void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd, 22 unsigned int ctrl_num) 23 { 24 unsigned int i; 25 unsigned int i2c_address = 0; 26 27 for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) { 28 if (ctrl_num == 0 && i == 0) { 29 i2c_address = SPD_EEPROM_ADDRESS1; 30 } 31 if (ctrl_num == 0 && i == 1) { 32 i2c_address = SPD_EEPROM_ADDRESS2; 33 } 34 if (ctrl_num == 1 && i == 0) { 35 i2c_address = SPD_EEPROM_ADDRESS3; 36 } 37 if (ctrl_num == 1 && i == 1) { 38 i2c_address = SPD_EEPROM_ADDRESS4; 39 } 40 get_spd(&(ctrl_dimms_spd[i]), i2c_address); 41 } 42 } 43 44 void fsl_ddr_board_options(memctl_options_t *popts, 45 dimm_params_t *pdimm, 46 unsigned int ctrl_num) 47 { 48 /* 49 * Factors to consider for clock adjust: 50 * - number of chips on bus 51 * - position of slot 52 * - DDR1 vs. DDR2? 53 * - ??? 54 * 55 * This needs to be determined on a board-by-board basis. 56 * 0110 3/4 cycle late 57 * 0111 7/8 cycle late 58 */ 59 popts->clk_adjust = 7; 60 61 /* 62 * Factors to consider for CPO: 63 * - frequency 64 * - ddr1 vs. ddr2 65 */ 66 popts->cpo_override = 10; 67 68 /* 69 * Factors to consider for write data delay: 70 * - number of DIMMs 71 * 72 * 1 = 1/4 clock delay 73 * 2 = 1/2 clock delay 74 * 3 = 3/4 clock delay 75 * 4 = 1 clock delay 76 * 5 = 5/4 clock delay 77 * 6 = 3/2 clock delay 78 */ 79 popts->write_data_delay = 3; 80 81 /* 82 * Factors to consider for half-strength driver enable: 83 * - number of DIMMs installed 84 */ 85 popts->half_strength_driver_enable = 0; 86 } 87