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 if (ctrl_num == 0 && i == 1) { 37 i2c_address = SPD_EEPROM_ADDRESS2; 38 } 39 if (ctrl_num == 1 && i == 0) { 40 i2c_address = SPD_EEPROM_ADDRESS3; 41 } 42 if (ctrl_num == 1 && i == 1) { 43 i2c_address = SPD_EEPROM_ADDRESS4; 44 } 45 get_spd(&(ctrl_dimms_spd[i]), i2c_address); 46 } 47 } 48 49 void fsl_ddr_board_options(memctl_options_t *popts, 50 dimm_params_t *pdimm, 51 unsigned int ctrl_num) 52 { 53 /* 54 * Factors to consider for clock adjust: 55 * - number of chips on bus 56 * - position of slot 57 * - DDR1 vs. DDR2? 58 * - ??? 59 * 60 * This needs to be determined on a board-by-board basis. 61 * 0110 3/4 cycle late 62 * 0111 7/8 cycle late 63 */ 64 popts->clk_adjust = 7; 65 66 /* 67 * Factors to consider for CPO: 68 * - frequency 69 * - ddr1 vs. ddr2 70 */ 71 popts->cpo_override = 10; 72 73 /* 74 * Factors to consider for write data delay: 75 * - number of DIMMs 76 * 77 * 1 = 1/4 clock delay 78 * 2 = 1/2 clock delay 79 * 3 = 3/4 clock delay 80 * 4 = 1 clock delay 81 * 5 = 5/4 clock delay 82 * 6 = 3/2 clock delay 83 */ 84 popts->write_data_delay = 3; 85 86 /* 87 * Factors to consider for half-strength driver enable: 88 * - number of DIMMs installed 89 */ 90 popts->half_strength_driver_enable = 0; 91 } 92