Redundant Environment: protect full sector size
[oweals/u-boot.git] / board / socrates / 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(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_ddr_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
31         if (ctrl_num) {
32                 printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num);
33                 return;
34         }
35
36         for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
37                 get_spd(&(ctrl_dimms_spd[i]), SPD_EEPROM_ADDRESS);
38         }
39 }
40
41 void fsl_ddr_board_options(memctl_options_t *popts,
42                                 dimm_params_t *pdimm,
43                                 unsigned int ctrl_num)
44 {
45         /*
46          * Factors to consider for clock adjust:
47          *      - number of chips on bus
48          *      - position of slot
49          *      - DDR1 vs. DDR2?
50          *      - ???
51          *
52          * This needs to be determined on a board-by-board basis.
53          *      0110    3/4 cycle late
54          *      0111    7/8 cycle late
55          */
56         popts->clk_adjust = 7;
57
58         /*
59          * Factors to consider for CPO:
60          *      - frequency
61          *      - ddr1 vs. ddr2
62          */
63         popts->cpo_override = 0;
64
65         /*
66          * Factors to consider for write data delay:
67          *      - number of DIMMs
68          *
69          * 1 = 1/4 clock delay
70          * 2 = 1/2 clock delay
71          * 3 = 3/4 clock delay
72          * 4 = 1   clock delay
73          * 5 = 5/4 clock delay
74          * 6 = 3/2 clock delay
75          */
76         popts->write_data_delay = 3;
77
78         /*
79          * Factors to consider for half-strength driver enable:
80          *      - number of DIMMs installed
81          */
82         popts->half_strength_driver_enable = 0;
83 }