board/freescale/t102xqds/ddr.c

   1 /*
   2  * Copyright 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
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 struct board_specific_parameters {
  18         u32 n_ranks;
  19         u32 datarate_mhz_high;
  20         u32 rank_gb;
  21         u32 clk_adjust;
  22         u32 wrlvl_start;
  23         u32 wrlvl_ctl_2;
  24         u32 wrlvl_ctl_3;
  25 };
  26
  27 /*
  28  * datarate_mhz_high values need to be in ascending order
  29  */
  30 static const struct board_specific_parameters udimm0[] = {
  31         /*
  32          * memory controller 0
  33          *   num|  hi| rank|  clk| wrlvl |   wrlvl   |  wrlvl |
  34          * ranks| mhz| GB  |adjst| start |   ctl2    |  ctl3  |
  35          */
  36 #if defined(CONFIG_SYS_FSL_DDR4)
  37         {2,  1666,  0,  4,  7,  0x0808090B,  0x0C0D0E0A,},
  38         {2,  1900,  0,  4,  6,  0x08080A0C,  0x0D0E0F0A,},
  39         {1,  1666,  0,  4,  6,  0x0708090B,  0x0C0D0E09,},
  40         {1,  1900,  0,  4,  6,  0x08080A0C,  0x0D0E0F0A,},
  41         {1,  2200,  0,  4,  7,  0x08090A0D,  0x0F0F100C,},
  42 #elif defined(CONFIG_SYS_FSL_DDR3)
  43         {2,  833,   0,  4,  6,  0x06060607,  0x08080807,},
  44         {2,  1350,  0,  4,  7,  0x0708080A,  0x0A0B0C09,},
  45         {2,  1666,  0,  4,  7,  0x0808090B,  0x0C0D0E0A,},
  46         {1,  833,   0,  4,  6,  0x06060607,  0x08080807,},
  47         {1,  1350,  0,  4,  7,  0x0708080A,  0x0A0B0C09,},
  48         {1,  1666,  0,  4,  7,  0x0808090B,  0x0C0D0E0A,},
  49 #else
  50 #error DDR type not defined
  51 #endif
  52         {}
  53 };
  54
  55 static const struct board_specific_parameters *udimms[] = {
  56         udimm0,
  57 };
  58
  59 void fsl_ddr_board_options(memctl_options_t *popts,
  60                            dimm_params_t *pdimm,
  61                            unsigned int ctrl_num)
  62 {
  63         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  64         ulong ddr_freq;
  65         struct cpu_type *cpu = gd->arch.cpu;
  66
  67         if (ctrl_num > 2) {
  68                 printf("Not supported controller number %d\n", ctrl_num);
  69                 return;
  70         }
  71         if (!pdimm->n_ranks)
  72                 return;
  73
  74         pbsp = udimms[0];
  75
  76         /* Get clk_adjust according to the board ddr freqency and n_banks
  77          * specified in board_specific_parameters table.
  78          */
  79         ddr_freq = get_ddr_freq(0) / 1000000;
  80         while (pbsp->datarate_mhz_high) {
  81                 if (pbsp->n_ranks == pdimm->n_ranks &&
  82                     (pdimm->rank_density >> 30) >= pbsp->rank_gb) {
  83                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  84                                 popts->clk_adjust = pbsp->clk_adjust;
  85                                 popts->wrlvl_start = pbsp->wrlvl_start;
  86                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  87                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  88                                 goto found;
  89                         }
  90                         pbsp_highest = pbsp;
  91                 }
  92                 pbsp++;
  93         }
  94
  95         if (pbsp_highest) {
  96                 printf("Error: board specific timing not found\n");
  97                 printf("for data rate %lu MT/s\n", ddr_freq);
  98                 printf("Trying to use the highest speed (%u) parameters\n",
  99                        pbsp_highest->datarate_mhz_high);
 100                 popts->clk_adjust = pbsp_highest->clk_adjust;
 101                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
 102                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
 103                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
 104         } else {
 105                 panic("DIMM is not supported by this board");
 106         }
 107 found:
 108         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n",
 109               pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb);
 110         debug("\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, ",
 111               pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2);
 112         debug("wrlvl_ctrl_3 0x%x\n", pbsp->wrlvl_ctl_3);
 113
 114         /*
 115          * Factors to consider for half-strength driver enable:
 116          *      - number of DIMMs installed
 117          */
 118         popts->half_strength_driver_enable = 1;
 119         /*
 120          * Write leveling override
 121          */
 122         popts->wrlvl_override = 1;
 123         popts->wrlvl_sample = 0xf;
 124
 125         /*
 126          * rtt and rtt_wr override
 127          */
 128         popts->rtt_override = 0;
 129
 130         /* Enable ZQ calibration */
 131         popts->zq_en = 1;
 132
 133         /* DHC_EN =1, ODT = 75 Ohm */
 134 #ifdef CONFIG_SYS_FSL_DDR4
 135         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
 136         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm) |
 137                           DDR_CDR2_VREF_OVRD(70);       /* Vref = 70% */
 138 #else
 139         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
 140         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
 141 #endif
 142
 143         /* T1023 supports max DDR bus 32bit width, T1024 supports DDR 64bit,
 144          * set DDR bus width to 32bit for T1023
 145          */
 146         if (cpu->soc_ver == SVR_T1023)
 147                 popts->data_bus_width = DDR_DATA_BUS_WIDTH_32;
 148
 149 #ifdef CONFIG_FORCE_DDR_DATA_BUS_WIDTH_32
 150         /* for DDR bus 32bit test on T1024 */
 151         popts->data_bus_width = DDR_DATA_BUS_WIDTH_32;
 152 #endif
 153 }
 154
 155 phys_size_t initdram(int board_type)
 156 {
 157         phys_size_t dram_size;
 158
 159 #if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_RAMBOOT_PBL)
 160         puts("Initializing....using SPD\n");
 161
 162         dram_size = fsl_ddr_sdram();
 163         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 164         dram_size *= 0x100000;
 165 #else
 166         /* DDR has been initialised by first stage boot loader */
 167         dram_size =  fsl_ddr_sdram_size();
 168 #endif
 169         return dram_size;
 170 }