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 15 get_spd(ddr2_spd_eeprom_t *spd, unsigned char i2c_address) 16 { 17 i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr2_spd_eeprom_t)); 18 } 19 20 unsigned int fsl_ddr_get_mem_data_rate(void) 21 { 22 return get_bus_freq(0); 23 } 24 25 void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd, 26 unsigned int ctrl_num) 27 { 28 unsigned int i; 29 unsigned int i2c_address = 0; 30 31 for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) { 32 if (ctrl_num == 0 && i == 0) { 33 i2c_address = SPD_EEPROM_ADDRESS1; 34 } 35 if (ctrl_num == 0 && i == 1) { 36 i2c_address = SPD_EEPROM_ADDRESS2; 37 } 38 if (ctrl_num == 1 && i == 0) { 39 i2c_address = SPD_EEPROM_ADDRESS3; 40 } 41 if (ctrl_num == 1 && i == 1) { 42 i2c_address = SPD_EEPROM_ADDRESS4; 43 } 44 get_spd(&(ctrl_dimms_spd[i]), i2c_address); 45 } 46 } 47 48 void fsl_ddr_board_options(memctl_options_t *popts, unsigned int ctrl_num) 49 { 50 /* 51 * Factors to consider for clock adjust: 52 * - number of chips on bus 53 * - position of slot 54 * - DDR1 vs. DDR2? 55 * - ??? 56 * 57 * This needs to be determined on a board-by-board basis. 58 * 0110 3/4 cycle late 59 * 0111 7/8 cycle late 60 */ 61 popts->clk_adjust = 7; 62 63 /* 64 * Factors to consider for CPO: 65 * - frequency 66 * - ddr1 vs. ddr2 67 */ 68 popts->cpo_override = 10; 69 70 /* 71 * Factors to consider for write data delay: 72 * - number of DIMMs 73 * 74 * 1 = 1/4 clock delay 75 * 2 = 1/2 clock delay 76 * 3 = 3/4 clock delay 77 * 4 = 1 clock delay 78 * 5 = 5/4 clock delay 79 * 6 = 3/2 clock delay 80 */ 81 popts->write_data_delay = 3; 82 83 /* 84 * Factors to consider for half-strength driver enable: 85 * - number of DIMMs installed 86 */ 87 popts->half_strength_driver_enable = 0; 88 } 89