1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2015 Freescale Semiconductor, Inc.
4 */
5
6 #include <common.h>
7 #include <fsl_ddr_sdram.h>
8 #include <fsl_ddr_dimm_params.h>
9 #ifdef CONFIG_FSL_DEEP_SLEEP
10 #include <fsl_sleep.h>
11 #endif
12 #include <asm/arch/clock.h>
13 #include "ddr.h"
14
15 DECLARE_GLOBAL_DATA_PTR;
16
fsl_ddr_board_options(memctl_options_t * popts,dimm_params_t * pdimm,unsigned int ctrl_num)17 void fsl_ddr_board_options(memctl_options_t *popts,
18 dimm_params_t *pdimm,
19 unsigned int ctrl_num)
20 {
21 const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
22 ulong ddr_freq;
23
24 if (ctrl_num > 3) {
25 printf("Not supported controller number %d\n", ctrl_num);
26 return;
27 }
28 if (!pdimm->n_ranks)
29 return;
30
31 pbsp = udimms[0];
32
33 /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
34 * freqency and n_banks specified in board_specific_parameters table.
35 */
36 ddr_freq = get_ddr_freq(0) / 1000000;
37 while (pbsp->datarate_mhz_high) {
38 if (pbsp->n_ranks == pdimm->n_ranks) {
39 if (ddr_freq <= pbsp->datarate_mhz_high) {
40 popts->clk_adjust = pbsp->clk_adjust;
41 popts->wrlvl_start = pbsp->wrlvl_start;
42 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
43 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
44 popts->cpo_override = pbsp->cpo_override;
45 popts->write_data_delay =
46 pbsp->write_data_delay;
47 goto found;
48 }
49 pbsp_highest = pbsp;
50 }
51 pbsp++;
52 }
53
54 if (pbsp_highest) {
55 printf("Error: board specific timing not found for %lu MT/s\n",
56 ddr_freq);
57 printf("Trying to use the highest speed (%u) parameters\n",
58 pbsp_highest->datarate_mhz_high);
59 popts->clk_adjust = pbsp_highest->clk_adjust;
60 popts->wrlvl_start = pbsp_highest->wrlvl_start;
61 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
62 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
63 } else {
64 panic("DIMM is not supported by this board");
65 }
66 found:
67 debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n",
68 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb);
69
70 /* force DDR bus width to 32 bits */
71 popts->data_bus_width = 1;
72 popts->otf_burst_chop_en = 0;
73 popts->burst_length = DDR_BL8;
74 popts->bstopre = 0; /* enable auto precharge */
75
76 /*
77 * Factors to consider for half-strength driver enable:
78 * - number of DIMMs installed
79 */
80 popts->half_strength_driver_enable = 1;
81 /*
82 * Write leveling override
83 */
84 popts->wrlvl_override = 1;
85 popts->wrlvl_sample = 0xf;
86
87 /*
88 * Rtt and Rtt_WR override
89 */
90 popts->rtt_override = 0;
91
92 /* Enable ZQ calibration */
93 popts->zq_en = 1;
94
95 #ifdef CONFIG_SYS_FSL_DDR4
96 popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
97 popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm) |
98 DDR_CDR2_VREF_OVRD(70); /* Vref = 70% */
99
100 /* optimize cpo for erratum A-009942 */
101 popts->cpo_sample = 0x59;
102 #else
103 popts->cswl_override = DDR_CSWL_CS0;
104
105 /* DHC_EN =1, ODT = 75 Ohm */
106 popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
107 popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
108 #endif
109 }
110
fsl_initdram(void)111 int fsl_initdram(void)
112 {
113 phys_size_t dram_size;
114
115 #if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
116 gd->ram_size = fsl_ddr_sdram_size();
117
118 return 0;
119 #else
120 puts("Initializing DDR....using SPD\n");
121
122 dram_size = fsl_ddr_sdram();
123 #endif
124 erratum_a008850_post();
125
126 #ifdef CONFIG_FSL_DEEP_SLEEP
127 fsl_dp_ddr_restore();
128 #endif
129
130 gd->ram_size = dram_size;
131
132 return 0;
133 }
134