source: SVN/rincon/u-boot/board/stxssa/ddr.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 2 years ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 1.4 KB
Line 
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
14static void
15get_spd(ddr1_spd_eeprom_t *spd, unsigned char i2c_address)
16{
17        i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr1_spd_eeprom_t));
18}
19
20
21unsigned int
22fsl_ddr_get_mem_data_rate(void)
23{
24        return get_ddr_freq(0);
25}
26
27
28void
29fsl_ddr_get_spd(ddr1_spd_eeprom_t *ctrl_dimms_spd,
30                      unsigned int ctrl_num)
31{
32        unsigned int i;
33        unsigned int i2c_address = 0;
34
35        for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
36                if (ctrl_num == 0 && i == 0) {
37                        i2c_address = SPD_EEPROM_ADDRESS;
38                }
39                get_spd(&(ctrl_dimms_spd[i]), i2c_address);
40        }
41}
42
43void fsl_ddr_board_options(memctl_options_t *popts, unsigned int ctrl_num)
44{
45        /*
46         * Factors to consider for CPO:
47         *      - frequency
48         *      - ddr1 vs. ddr2
49         */
50        popts->cpo_override = 0;
51
52        /*
53         * Factors to consider for write data delay:
54         *      - number of DIMMs
55         *
56         * 1 = 1/4 clock delay
57         * 2 = 1/2 clock delay
58         * 3 = 3/4 clock delay
59         * 4 = 1   clock delay
60         * 5 = 5/4 clock delay
61         * 6 = 3/2 clock delay
62         */
63        popts->write_data_delay = 3;
64
65        /*
66         * Factors to consider for half-strength driver enable:
67         *      - number of DIMMs installed
68         */
69        popts->half_strength_driver_enable = 0;
70}
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