1*83d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+
2d4b91066SYork Sun /*
3d4b91066SYork Sun * Copyright 2011 Freescale Semiconductor, Inc.
4d4b91066SYork Sun */
5d4b91066SYork Sun
6d4b91066SYork Sun #include <common.h>
7d4b91066SYork Sun
85614e71bSYork Sun #include <fsl_ddr_sdram.h>
95614e71bSYork Sun #include <fsl_ddr_dimm_params.h>
10d4b91066SYork Sun
11d4b91066SYork Sun struct board_specific_parameters {
12d4b91066SYork Sun u32 n_ranks;
13712cf7abSYork Sun u32 datarate_mhz_high;
14d4b91066SYork Sun u32 clk_adjust;
15d4b91066SYork Sun u32 cpo;
16d4b91066SYork Sun u32 write_data_delay;
170dd38a35SPriyanka Jain u32 force_2t;
18d4b91066SYork Sun };
19d4b91066SYork Sun
20712cf7abSYork Sun /*
21712cf7abSYork Sun * This table contains all valid speeds we want to override with board
22712cf7abSYork Sun * specific parameters. datarate_mhz_high values need to be in ascending order
23712cf7abSYork Sun * for each n_ranks group.
24712cf7abSYork Sun */
25712cf7abSYork Sun static const struct board_specific_parameters udimm0[] = {
26d4b91066SYork Sun /*
27d4b91066SYork Sun * memory controller 0
28712cf7abSYork Sun * num| hi| clk| cpo|wrdata|2T
29712cf7abSYork Sun * ranks| mhz|adjst| | delay|
30d4b91066SYork Sun */
31712cf7abSYork Sun {2, 300, 4, 4, 2, 0},
32712cf7abSYork Sun {2, 365, 4, 6, 2, 0},
33712cf7abSYork Sun {2, 450, 4, 7, 2, 0},
34712cf7abSYork Sun {2, 850, 4, 31, 2, 0},
35712cf7abSYork Sun {1, 300, 4, 4, 2, 0},
36712cf7abSYork Sun {1, 365, 4, 6, 2, 0},
37712cf7abSYork Sun {1, 450, 4, 7, 2, 0},
38712cf7abSYork Sun {1, 850, 4, 31, 2, 0},
39712cf7abSYork Sun {}
40d4b91066SYork Sun };
41d4b91066SYork Sun
fsl_ddr_board_options(memctl_options_t * popts,dimm_params_t * pdimm,unsigned int ctrl_num)42d4b91066SYork Sun void fsl_ddr_board_options(memctl_options_t *popts,
43d4b91066SYork Sun dimm_params_t *pdimm,
44d4b91066SYork Sun unsigned int ctrl_num)
45d4b91066SYork Sun {
46712cf7abSYork Sun const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
47712cf7abSYork Sun unsigned int i;
48d4b91066SYork Sun ulong ddr_freq;
49d4b91066SYork Sun
50d4b91066SYork Sun if (ctrl_num != 0) /* we have only one controller */
51d4b91066SYork Sun return;
52d4b91066SYork Sun for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
53d4b91066SYork Sun if (pdimm[i].n_ranks)
54d4b91066SYork Sun break;
55d4b91066SYork Sun }
56d4b91066SYork Sun if (i >= CONFIG_DIMM_SLOTS_PER_CTLR) /* no DIMM */
57d4b91066SYork Sun return;
58d4b91066SYork Sun
59712cf7abSYork Sun pbsp = udimm0;
60d4b91066SYork Sun
61d4b91066SYork Sun /* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
62d4b91066SYork Sun * freqency and n_banks specified in board_specific_parameters table.
63d4b91066SYork Sun */
64d4b91066SYork Sun ddr_freq = get_ddr_freq(0) / 1000000;
65712cf7abSYork Sun while (pbsp->datarate_mhz_high) {
66712cf7abSYork Sun if (pbsp->n_ranks == pdimm[i].n_ranks) {
67712cf7abSYork Sun if (ddr_freq <= pbsp->datarate_mhz_high) {
68d4b91066SYork Sun popts->clk_adjust = pbsp->clk_adjust;
69d4b91066SYork Sun popts->cpo_override = pbsp->cpo;
70712cf7abSYork Sun popts->write_data_delay =
71712cf7abSYork Sun pbsp->write_data_delay;
720dd38a35SPriyanka Jain popts->twot_en = pbsp->force_2t;
73712cf7abSYork Sun goto found;
74712cf7abSYork Sun }
75712cf7abSYork Sun pbsp_highest = pbsp;
76d4b91066SYork Sun }
77d4b91066SYork Sun pbsp++;
78d4b91066SYork Sun }
79d4b91066SYork Sun
80712cf7abSYork Sun if (pbsp_highest) {
81712cf7abSYork Sun printf("Error: board specific timing not found "
82712cf7abSYork Sun "for data rate %lu MT/s!\n"
83712cf7abSYork Sun "Trying to use the highest speed (%u) parameters\n",
84712cf7abSYork Sun ddr_freq, pbsp_highest->datarate_mhz_high);
85712cf7abSYork Sun popts->clk_adjust = pbsp_highest->clk_adjust;
86712cf7abSYork Sun popts->cpo_override = pbsp_highest->cpo;
87712cf7abSYork Sun popts->write_data_delay = pbsp_highest->write_data_delay;
880dd38a35SPriyanka Jain popts->twot_en = pbsp_highest->force_2t;
89712cf7abSYork Sun } else {
90712cf7abSYork Sun panic("DIMM is not supported by this board");
91d4b91066SYork Sun }
92d4b91066SYork Sun
93712cf7abSYork Sun found:
94d4b91066SYork Sun /*
95d4b91066SYork Sun * Factors to consider for half-strength driver enable:
96d4b91066SYork Sun * - number of DIMMs installed
97d4b91066SYork Sun */
98d4b91066SYork Sun popts->half_strength_driver_enable = 0;
990dd38a35SPriyanka Jain popts->dqs_config = 0; /* only true DQS signal is used on board */
100d4b91066SYork Sun }
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