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 #include <asm/arch/soc.h>
10 #include <asm/arch/clock.h>
11 #include "ddr.h"
12 
13 DECLARE_GLOBAL_DATA_PTR;
14 
15 void fsl_ddr_board_options(memctl_options_t *popts,
16 				dimm_params_t *pdimm,
17 				unsigned int ctrl_num)
18 {
19 #ifdef CONFIG_SYS_FSL_HAS_DP_DDR
20 	u8 dq_mapping_0, dq_mapping_2, dq_mapping_3;
21 #endif
22 	const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
23 	ulong ddr_freq;
24 	int slot;
25 
26 	if (ctrl_num > 2) {
27 		printf("Not supported controller number %d\n", ctrl_num);
28 		return;
29 	}
30 
31 	for (slot = 0; slot < CONFIG_DIMM_SLOTS_PER_CTLR; slot++) {
32 		if (pdimm[slot].n_ranks)
33 			break;
34 	}
35 
36 	if (slot >= CONFIG_DIMM_SLOTS_PER_CTLR)
37 		return;
38 
39 	/*
40 	 * we use identical timing for all slots. If needed, change the code
41 	 * to  pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num];
42 	 */
43 	if (popts->registered_dimm_en)
44 		pbsp = rdimms[ctrl_num];
45 	else
46 		pbsp = udimms[ctrl_num];
47 
48 
49 	/* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
50 	 * freqency and n_banks specified in board_specific_parameters table.
51 	 */
52 	ddr_freq = get_ddr_freq(ctrl_num) / 1000000;
53 	while (pbsp->datarate_mhz_high) {
54 		if (pbsp->n_ranks == pdimm[slot].n_ranks &&
55 		    (pdimm[slot].rank_density >> 30) >= pbsp->rank_gb) {
56 			if (ddr_freq <= pbsp->datarate_mhz_high) {
57 				popts->clk_adjust = pbsp->clk_adjust;
58 				popts->wrlvl_start = pbsp->wrlvl_start;
59 				popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
60 				popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
61 				goto found;
62 			}
63 			pbsp_highest = pbsp;
64 		}
65 		pbsp++;
66 	}
67 
68 	if (pbsp_highest) {
69 		printf("Error: board specific timing not found for data rate %lu MT/s\n"
70 			"Trying to use the highest speed (%u) parameters\n",
71 			ddr_freq, pbsp_highest->datarate_mhz_high);
72 		popts->clk_adjust = pbsp_highest->clk_adjust;
73 		popts->wrlvl_start = pbsp_highest->wrlvl_start;
74 		popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
75 		popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
76 	} else {
77 		panic("DIMM is not supported by this board");
78 	}
79 found:
80 	debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
81 		"\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, wrlvl_ctrl_3 0x%x\n",
82 		pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
83 		pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
84 		pbsp->wrlvl_ctl_3);
85 #ifdef CONFIG_SYS_FSL_HAS_DP_DDR
86 	if (ctrl_num == CONFIG_DP_DDR_CTRL) {
87 		if (popts->registered_dimm_en)
88 			printf("WARN: RDIMM not supported.\n");
89 		/* force DDR bus width to 32 bits */
90 		popts->data_bus_width = 1;
91 		popts->otf_burst_chop_en = 0;
92 		popts->burst_length = DDR_BL8;
93 		popts->bstopre = 0;	/* enable auto precharge */
94 		/*
95 		 * Layout optimization results byte mapping
96 		 * Byte 0 -> Byte ECC
97 		 * Byte 1 -> Byte 3
98 		 * Byte 2 -> Byte 2
99 		 * Byte 3 -> Byte 1
100 		 * Byte ECC -> Byte 0
101 		 */
102 		dq_mapping_0 = pdimm[slot].dq_mapping[0];
103 		dq_mapping_2 = pdimm[slot].dq_mapping[2];
104 		dq_mapping_3 = pdimm[slot].dq_mapping[3];
105 		pdimm[slot].dq_mapping[0] = pdimm[slot].dq_mapping[8];
106 		pdimm[slot].dq_mapping[1] = pdimm[slot].dq_mapping[9];
107 		pdimm[slot].dq_mapping[2] = pdimm[slot].dq_mapping[6];
108 		pdimm[slot].dq_mapping[3] = pdimm[slot].dq_mapping[7];
109 		pdimm[slot].dq_mapping[6] = dq_mapping_2;
110 		pdimm[slot].dq_mapping[7] = dq_mapping_3;
111 		pdimm[slot].dq_mapping[8] = dq_mapping_0;
112 		pdimm[slot].dq_mapping[9] = 0;
113 		pdimm[slot].dq_mapping[10] = 0;
114 		pdimm[slot].dq_mapping[11] = 0;
115 		pdimm[slot].dq_mapping[12] = 0;
116 		pdimm[slot].dq_mapping[13] = 0;
117 		pdimm[slot].dq_mapping[14] = 0;
118 		pdimm[slot].dq_mapping[15] = 0;
119 		pdimm[slot].dq_mapping[16] = 0;
120 		pdimm[slot].dq_mapping[17] = 0;
121 	}
122 #endif
123 	/* To work at higher than 1333MT/s */
124 	popts->half_strength_driver_enable = 0;
125 	/*
126 	 * Write leveling override
127 	 */
128 	popts->wrlvl_override = 1;
129 	popts->wrlvl_sample = 0x0;	/* 32 clocks */
130 
131 	/*
132 	 * Rtt and Rtt_WR override
133 	 */
134 	popts->rtt_override = 0;
135 
136 	/* Enable ZQ calibration */
137 	popts->zq_en = 1;
138 
139 	/* optimize cpo for erratum A-009942 */
140 	popts->cpo_sample = 0x6e;
141 
142 	if (ddr_freq < 2350) {
143 		if (pdimm[0].n_ranks == 2 && pdimm[1].n_ranks == 2) {
144 			/* four chip-selects */
145 			popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
146 					  DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
147 			popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm);
148 			popts->twot_en = 1;	/* enable 2T timing */
149 		} else {
150 			popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
151 					  DDR_CDR1_ODT(DDR_CDR_ODT_60ohm);
152 			popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_60ohm) |
153 					  DDR_CDR2_VREF_RANGE_2;
154 		}
155 	} else {
156 		popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
157 				  DDR_CDR1_ODT(DDR_CDR_ODT_100ohm);
158 		popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_100ohm) |
159 				  DDR_CDR2_VREF_RANGE_2;
160 	}
161 }
162 
163 int fsl_initdram(void)
164 {
165 #if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
166 	gd->ram_size = fsl_ddr_sdram_size();
167 #else
168 	puts("Initializing DDR....using SPD\n");
169 
170 	gd->ram_size = fsl_ddr_sdram();
171 #endif
172 
173 	return 0;
174 }
175