| Peter Tyser | 1f03cbf | 2008-12-23 16:32:00 -0600 | [diff] [blame] | 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 | unsigned int fsl_ddr_get_mem_data_rate(void) |
| 31 | { |
| 32 | return get_ddr_freq(0); |
| 33 | } |
| 34 | |
| 35 | void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd, |
| 36 | unsigned int ctrl_num) |
| 37 | { |
| 38 | unsigned int i; |
| 39 | |
| 40 | if (ctrl_num) { |
| 41 | printf("%s: invalid ctrl_num = %d\n", __func__, ctrl_num); |
| 42 | return; |
| 43 | } |
| 44 | |
| 45 | for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) |
| 46 | get_spd(&(ctrl_dimms_spd[i]), SPD_EEPROM_ADDRESS); |
| 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 = 9; |
| 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 | } |