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 14 static void get_spd(ddr2_spd_eeprom_t *spd, unsigned char i2c_address) 15 { 16 i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr2_spd_eeprom_t)); 17 } 18 19 unsigned int fsl_ddr_get_mem_data_rate(void) 20 { 21 return get_ddr_freq(0); 22 } 23 24 void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd, 25 unsigned int ctrl_num) 26 { 27 unsigned int i; 28 29 if (ctrl_num) { 30 printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num); 31 return; 32 } 33 34 for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) { 35 get_spd(&(ctrl_dimms_spd[i]), SPD_EEPROM_ADDRESS); 36 } 37 } 38 39 void fsl_ddr_board_options(memctl_options_t *popts, unsigned int ctrl_num) 40 { 41 /* 42 * Factors to consider for clock adjust: 43 * - number of chips on bus 44 * - position of slot 45 * - DDR1 vs. DDR2? 46 * - ??? 47 * 48 * This needs to be determined on a board-by-board basis. 49 * 0110 3/4 cycle late 50 * 0111 7/8 cycle late 51 */ 52 popts->clk_adjust = 7; 53 54 /* 55 * Factors to consider for CPO: 56 * - frequency 57 * - ddr1 vs. ddr2 58 */ 59 popts->cpo_override = 10; 60 61 /* 62 * Factors to consider for write data delay: 63 * - number of DIMMs 64 * 65 * 1 = 1/4 clock delay 66 * 2 = 1/2 clock delay 67 * 3 = 3/4 clock delay 68 * 4 = 1 clock delay 69 * 5 = 5/4 clock delay 70 * 6 = 3/2 clock delay 71 */ 72 popts->write_data_delay = 3; 73 74 /* 75 * Factors to consider for half-strength driver enable: 76 * - number of DIMMs installed 77 */ 78 popts->half_strength_driver_enable = 0; 79 } 80