]> git.sur5r.net Git - u-boot/blob - board/freescale/mpc8540ads/ddr.c
85xx: Fix the wrong BCSR address of 8569MDS
[u-boot] / board / freescale / mpc8540ads / ddr.c
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(ddr1_spd_eeprom_t *spd, unsigned char i2c_address)
17 {
18         i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr1_spd_eeprom_t));
19 }
20
21
22 unsigned int
23 fsl_ddr_get_mem_data_rate(void)
24 {
25         return get_ddr_freq(0);
26 }
27
28
29 void
30 fsl_ddr_get_spd(ddr1_spd_eeprom_t *ctrl_dimms_spd,
31                       unsigned int ctrl_num)
32 {
33         unsigned int i;
34         unsigned int i2c_address = 0;
35
36         for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
37                 if (ctrl_num == 0 && i == 0) {
38                         i2c_address = SPD_EEPROM_ADDRESS;
39                 }
40                 get_spd(&(ctrl_dimms_spd[i]), i2c_address);
41         }
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 CPO:
50          *      - frequency
51          *      - ddr1 vs. ddr2
52          */
53         popts->cpo_override = 0;
54
55         /*
56          * Factors to consider for write data delay:
57          *      - number of DIMMs
58          *
59          * 1 = 1/4 clock delay
60          * 2 = 1/2 clock delay
61          * 3 = 3/4 clock delay
62          * 4 = 1   clock delay
63          * 5 = 5/4 clock delay
64          * 6 = 3/2 clock delay
65          */
66         popts->write_data_delay = 3;
67
68         /* 2T timing enable */
69         popts->twoT_en = 1;
70
71         /*
72          * Factors to consider for half-strength driver enable:
73          *      - number of DIMMs installed
74          */
75         popts->half_strength_driver_enable = 0;
76 }