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Merge branch 'master' of git://git.denx.de/u-boot-ppc4xx
[karo-tx-uboot.git] / board / freescale / mpc8572ds / 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 get_spd(ddr2_spd_eeprom_t *spd, unsigned char i2c_address)
16 {
17         i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr2_spd_eeprom_t));
18 }
19
20 unsigned int fsl_ddr_get_mem_data_rate(void)
21 {
22         return get_ddr_freq(0);
23 }
24
25 void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd,
26                       unsigned int ctrl_num)
27 {
28         unsigned int i;
29         unsigned int i2c_address = 0;
30
31         for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
32                 if (ctrl_num == 0 && i == 0) {
33                         i2c_address = SPD_EEPROM_ADDRESS1;
34                 }
35                 if (ctrl_num == 1 && i == 0) {
36                         i2c_address = SPD_EEPROM_ADDRESS2;
37                 }
38                 get_spd(&(ctrl_dimms_spd[i]), i2c_address);
39         }
40 }
41
42 typedef struct {
43         u32 datarate_mhz_low;
44         u32 datarate_mhz_high;
45         u32 n_ranks;
46         u32 clk_adjust;
47         u32 cpo;
48         u32 write_data_delay;
49         u32 force_2T;
50 } board_specific_parameters_t;
51
52 /* ranges for parameters:
53  *  wr_data_delay = 0-6
54  *  clk adjust = 0-8
55  *  cpo 2-0x1E (30)
56  */
57
58
59 /* XXX: these values need to be checked for all interleaving modes.  */
60 /* XXX: No reliable dual-rank 800 MHz setting has been found.  It may
61  *      seem reliable, but errors will appear when memory intensive
62  *      program is run. */
63 /* XXX: Single rank at 800 MHz is OK.  */
64 const board_specific_parameters_t board_specific_parameters[][20] = {
65         {
66         /*      memory controller 0                     */
67         /*        lo|  hi|  num|  clk| cpo|wrdata|2T    */
68         /*       mhz| mhz|ranks|adjst|    | delay|      */
69                 {  0, 333,    2,    6,   7,    3,  0},
70                 {334, 400,    2,    6,   9,    3,  0},
71                 {401, 549,    2,    6,  11,    3,  0},
72                 {550, 680,    2,    1,  10,    5,  0},
73                 {681, 850,    2,    1,  12,    5,  1},
74                 {  0, 333,    1,    6,   7,    3,  0},
75                 {334, 400,    1,    6,   9,    3,  0},
76                 {401, 549,    1,    6,  11,    3,  0},
77                 {550, 680,    1,    1,  10,    5,  0},
78                 {681, 850,    1,    1,  12,    5,  0}
79         },
80
81         {
82         /*      memory controller 1                     */
83         /*        lo|  hi|  num|  clk| cpo|wrdata|2T    */
84         /*       mhz| mhz|ranks|adjst|    | delay|      */
85                 {  0, 333,    2,     6,  7,    3,  0},
86                 {334, 400,    2,     6,  9,    3,  0},
87                 {401, 549,    2,     6, 11,    3,  0},
88                 {550, 680,    2,     1, 11,    6,  0},
89                 {681, 850,    2,     1, 13,    6,  1},
90                 {  0, 333,    1,     6,  7,    3,  0},
91                 {334, 400,    1,     6,  9,    3,  0},
92                 {401, 549,    1,     6, 11,    3,  0},
93                 {550, 680,    1,     1, 11,    6,  0},
94                 {681, 850,    1,     1, 13,    6,  0}
95         }
96 };
97
98 void fsl_ddr_board_options(memctl_options_t *popts,
99                                 dimm_params_t *pdimm,
100                                 unsigned int ctrl_num)
101 {
102         const board_specific_parameters_t *pbsp =
103                                 &(board_specific_parameters[ctrl_num][0]);
104         u32 num_params = sizeof(board_specific_parameters[ctrl_num]) /
105                                 sizeof(board_specific_parameters[0][0]);
106         u32 i;
107         ulong ddr_freq;
108
109         /* set odt_rd_cfg and odt_wr_cfg. If the there is only one dimm in
110          * that controller, set odt_wr_cfg to 4 for CS0, and 0 to CS1. If
111          * there are two dimms in the controller, set odt_rd_cfg to 3 and
112          * odt_wr_cfg to 3 for the even CS, 0 for the odd CS.
113          */
114         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
115                 if (i&1) {      /* odd CS */
116                         popts->cs_local_opts[i].odt_rd_cfg = 0;
117                         popts->cs_local_opts[i].odt_wr_cfg = 0;
118                 } else {        /* even CS */
119                         if (CONFIG_DIMM_SLOTS_PER_CTLR == 1) {
120                                 popts->cs_local_opts[i].odt_rd_cfg = 0;
121                                 popts->cs_local_opts[i].odt_wr_cfg = 4;
122                         } else if (CONFIG_DIMM_SLOTS_PER_CTLR == 2) {
123                         popts->cs_local_opts[i].odt_rd_cfg = 3;
124                         popts->cs_local_opts[i].odt_wr_cfg = 3;
125                         }
126                 }
127         }
128
129         /* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
130          * freqency and n_banks specified in board_specific_parameters table.
131          */
132         ddr_freq = get_ddr_freq(0) / 1000000;
133         for (i = 0; i < num_params; i++) {
134                 if (ddr_freq >= pbsp->datarate_mhz_low &&
135                     ddr_freq <= pbsp->datarate_mhz_high &&
136                     pdimm->n_ranks == pbsp->n_ranks) {
137                         popts->clk_adjust = pbsp->clk_adjust;
138                         popts->cpo_override = pbsp->cpo;
139                         popts->write_data_delay = pbsp->write_data_delay;
140                         popts->twoT_en = pbsp->force_2T;
141                 }
142                 pbsp++;
143         }
144
145         /*
146          * Factors to consider for half-strength driver enable:
147          *      - number of DIMMs installed
148          */
149         popts->half_strength_driver_enable = 0;
150 }