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 /* We use soldered memory, but use an SPD EEPROM to describe it. 21 * The SPD has an unspecified dimm type, but the DDR2 initialization 22 * code requires a specific type to be specified. This sets the type 23 * as a standard unregistered SO-DIMM. */ 24 if (spd->dimm_type == 0) { 25 spd->dimm_type = 0x4; 26 ((uchar *)spd)[63] += 0x4; 27 } 28 } 29 30 void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd, 31 unsigned int ctrl_num) 32 { 33 unsigned int i; 34 35 if (ctrl_num) { 36 printf("%s: invalid ctrl_num = %d\n", __func__, ctrl_num); 37 return; 38 } 39 40 for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) 41 get_spd(&(ctrl_dimms_spd[i]), SPD_EEPROM_ADDRESS); 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 = 9; 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