1 /*
2  * Copyright 2015 Freescale Semiconductor, Inc.
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <fsl_ddr_sdram.h>
9 #include <fsl_ddr_dimm_params.h>
10 #include <asm/arch/soc.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 		/* force DDR bus width to 32 bits */
88 		popts->data_bus_width = 1;
89 		popts->otf_burst_chop_en = 0;
90 		popts->burst_length = DDR_BL8;
91 		popts->bstopre = 0;	/* enable auto precharge */
92 		/*
93 		 * Layout optimization results byte mapping
94 		 * Byte 0 -> Byte ECC
95 		 * Byte 1 -> Byte 3
96 		 * Byte 2 -> Byte 2
97 		 * Byte 3 -> Byte 1
98 		 * Byte ECC -> Byte 0
99 		 */
100 		dq_mapping_0 = pdimm[slot].dq_mapping[0];
101 		dq_mapping_2 = pdimm[slot].dq_mapping[2];
102 		dq_mapping_3 = pdimm[slot].dq_mapping[3];
103 		pdimm[slot].dq_mapping[0] = pdimm[slot].dq_mapping[8];
104 		pdimm[slot].dq_mapping[1] = pdimm[slot].dq_mapping[9];
105 		pdimm[slot].dq_mapping[2] = pdimm[slot].dq_mapping[6];
106 		pdimm[slot].dq_mapping[3] = pdimm[slot].dq_mapping[7];
107 		pdimm[slot].dq_mapping[6] = dq_mapping_2;
108 		pdimm[slot].dq_mapping[7] = dq_mapping_3;
109 		pdimm[slot].dq_mapping[8] = dq_mapping_0;
110 		pdimm[slot].dq_mapping[9] = 0;
111 		pdimm[slot].dq_mapping[10] = 0;
112 		pdimm[slot].dq_mapping[11] = 0;
113 		pdimm[slot].dq_mapping[12] = 0;
114 		pdimm[slot].dq_mapping[13] = 0;
115 		pdimm[slot].dq_mapping[14] = 0;
116 		pdimm[slot].dq_mapping[15] = 0;
117 		pdimm[slot].dq_mapping[16] = 0;
118 		pdimm[slot].dq_mapping[17] = 0;
119 	}
120 #endif
121 	/* To work at higher than 1333MT/s */
122 	popts->half_strength_driver_enable = 0;
123 	/*
124 	 * Write leveling override
125 	 */
126 	popts->wrlvl_override = 1;
127 	popts->wrlvl_sample = 0x0;	/* 32 clocks */
128 
129 	/*
130 	 * Rtt and Rtt_WR override
131 	 */
132 	popts->rtt_override = 0;
133 
134 	/* Enable ZQ calibration */
135 	popts->zq_en = 1;
136 
137 	if (ddr_freq < 2350) {
138 		if (pdimm[0].n_ranks == 2 && pdimm[1].n_ranks == 2) {
139 			/* four chip-selects */
140 			popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
141 					  DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
142 			popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm);
143 			popts->twot_en = 1; /* enable 2T timing */
144 		} else {
145 			popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
146 					  DDR_CDR1_ODT(DDR_CDR_ODT_60ohm);
147 			popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_60ohm) |
148 					  DDR_CDR2_VREF_RANGE_2;
149 		}
150 	} else {
151 		popts->ddr_cdr1 = DDR_CDR1_DHC_EN |
152 				  DDR_CDR1_ODT(DDR_CDR_ODT_100ohm);
153 		popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_100ohm) |
154 				  DDR_CDR2_VREF_RANGE_2;
155 	}
156 }
157 
158 int fsl_initdram(void)
159 {
160 #if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
161 	gd->ram_size = fsl_ddr_sdram_size();
162 #else
163 	puts("Initializing DDR....using SPD\n");
164 
165 	gd->ram_size = fsl_ddr_sdram();
166 #endif
167 
168 	return 0;
169 }
170