board_f: Drop return value from initdram()
[oweals/u-boot.git] / board / freescale / t1040qds / ddr.c
1 /*
2  * Copyright 2013-2014 Freescale Semiconductor, Inc.
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6
7 #include <common.h>
8 #include <i2c.h>
9 #include <hwconfig.h>
10 #include <asm/mmu.h>
11 #include <fsl_ddr_sdram.h>
12 #include <fsl_ddr_dimm_params.h>
13 #include <asm/fsl_law.h>
14 #include <asm/mpc85xx_gpio.h>
15 #include "ddr.h"
16
17 DECLARE_GLOBAL_DATA_PTR;
18
19 void fsl_ddr_board_options(memctl_options_t *popts,
20                                 dimm_params_t *pdimm,
21                                 unsigned int ctrl_num)
22 {
23         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
24         ulong ddr_freq;
25
26         if (ctrl_num > 2) {
27                 printf("Not supported controller number %d\n", ctrl_num);
28                 return;
29         }
30         if (!pdimm->n_ranks)
31                 return;
32
33         pbsp = udimms[0];
34
35         /* Get clk_adjust, cpo, write_data_delay,2t, according to the board ddr
36          * freqency and n_banks specified in board_specific_parameters table.
37          */
38         ddr_freq = get_ddr_freq(0) / 1000000;
39         while (pbsp->datarate_mhz_high) {
40                 if (pbsp->n_ranks == pdimm->n_ranks &&
41                     (pdimm->rank_density >> 30) >= pbsp->rank_gb) {
42                         if (ddr_freq <= pbsp->datarate_mhz_high) {
43                                 popts->clk_adjust = pbsp->clk_adjust;
44                                 popts->wrlvl_start = pbsp->wrlvl_start;
45                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
46                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
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\n");
56                 printf("for data rate %lu MT/s\n", 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                 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, "
69                 "wrlvl_ctrl_3 0x%x\n",
70                 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
71                 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
72                 pbsp->wrlvl_ctl_3);
73
74         /*
75          * Factors to consider for half-strength driver enable:
76          *      - number of DIMMs installed
77          */
78         popts->half_strength_driver_enable = 1;
79         /*
80          * Write leveling override
81          */
82         popts->wrlvl_override = 1;
83         popts->wrlvl_sample = 0xf;
84
85         /*
86          * rtt and rtt_wr override
87          */
88         popts->rtt_override = 0;
89
90         /* Enable ZQ calibration */
91         popts->zq_en = 1;
92
93         /* DHC_EN =1, ODT = 75 Ohm */
94 #ifdef CONFIG_SYS_FSL_DDR4
95         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
96         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm) |
97                           DDR_CDR2_VREF_OVRD(70);       /* Vref = 70% */
98
99         /* optimize cpo for erratum A-009942 */
100         popts->cpo_sample = 0x69;
101 #else
102         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
103         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
104 #endif
105 }
106
107 #if defined(CONFIG_DEEP_SLEEP)
108 void board_mem_sleep_setup(void)
109 {
110         void __iomem *qixis_base = (void *)QIXIS_BASE;
111
112         /* does not provide HW signals for power management */
113         clrbits_8(qixis_base + 0x21, 0x2);
114         /* Disable MCKE isolation */
115         gpio_set_value(2, 0);
116         udelay(1);
117 }
118 #endif
119
120 int initdram(void)
121 {
122         phys_size_t dram_size;
123
124         puts("Initializing....using SPD\n");
125
126         dram_size = fsl_ddr_sdram();
127
128         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
129         dram_size *= 0x100000;
130
131         puts("    DDR: ");
132
133 #if defined(CONFIG_DEEP_SLEEP) && !defined(CONFIG_SPL_BUILD)
134         fsl_dp_resume();
135 #endif
136
137         gd->ram_size = dram_size;
138
139         return 0;
140 }