board/freescale/ls1088a/ddr.c

   1 /*
   2  * Copyright 2017 NXP
   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 <asm/arch/clock.h>
  12 #include "ddr.h"
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 #if defined(CONFIG_VID) && (!defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD))
  17 static void fsl_ddr_setup_0v9_volt(memctl_options_t *popts)
  18 {
  19         int vdd;
  20
  21         vdd = get_core_volt_from_fuse();
  22         /* Nothing to do for silicons doesn't support VID */
  23         if (vdd < 0)
  24                 return;
  25
  26         if (vdd == 900) {
  27                 popts->ddr_cdr1 |= DDR_CDR1_V0PT9_EN;
  28                 debug("VID: configure DDR to support 900 mV\n");
  29         }
  30 }
  31 #endif
  32
  33 void fsl_ddr_board_options(memctl_options_t *popts,
  34                            dimm_params_t *pdimm,
  35                            unsigned int ctrl_num)
  36 {
  37         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  38         ulong ddr_freq;
  39
  40         if (ctrl_num > 1) {
  41                 printf("Not supported controller number %d\n", ctrl_num);
  42                 return;
  43         }
  44         if (!pdimm->n_ranks)
  45                 return;
  46
  47         /*
  48          * we use identical timing for all slots. If needed, change the code
  49          * to  pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num];
  50          */
  51         pbsp = udimms[0];
  52
  53         /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
  54          * freqency and n_banks specified in board_specific_parameters table.
  55          */
  56         ddr_freq = get_ddr_freq(0) / 1000000;
  57         while (pbsp->datarate_mhz_high) {
  58                 if (pbsp->n_ranks == pdimm->n_ranks) {
  59                         if (ddr_freq <= pbsp->datarate_mhz_high) {
  60                                 popts->clk_adjust = pbsp->clk_adjust;
  61                                 popts->wrlvl_start = pbsp->wrlvl_start;
  62                                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  63                                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  64                                 goto found;
  65                         }
  66                         pbsp_highest = pbsp;
  67                 }
  68                 pbsp++;
  69         }
  70
  71         if (pbsp_highest) {
  72                 printf("Error: board specific timing not found for %lu MT/s\n",
  73                        ddr_freq);
  74                 printf("Trying to use the highest speed (%u) parameters\n",
  75                        pbsp_highest->datarate_mhz_high);
  76                 popts->clk_adjust = pbsp_highest->clk_adjust;
  77                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
  78                 popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  79                 popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  80         } else {
  81                 panic("DIMM is not supported by this board");
  82         }
  83 found:
  84         debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
  85                 "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, wrlvl_ctrl_3 0x%x\n",
  86                 pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
  87                 pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
  88                 pbsp->wrlvl_ctl_3);
  89
  90
  91
  92         popts->half_strength_driver_enable = 0;
  93         /*
  94          * Write leveling override
  95          */
  96         popts->wrlvl_override = 1;
  97         popts->wrlvl_sample = 0xf;
  98
  99
 100         /* Enable ZQ calibration */
 101         popts->zq_en = 1;
 102
 103         /* Enable DDR hashing */
 104         popts->addr_hash = 1;
 105
 106         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_60ohm);
 107 #if defined(CONFIG_VID) && (!defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD))
 108         fsl_ddr_setup_0v9_volt(popts);
 109 #endif
 110
 111         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_60ohm) |
 112                           DDR_CDR2_VREF_TRAIN_EN | DDR_CDR2_VREF_RANGE_2;
 113 }
 114
 115
 116 int fsl_initdram(void)
 117 {
 118         puts("Initializing DDR....using SPD\n");
 119
 120 #if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
 121         gd->ram_size = fsl_ddr_sdram_size();
 122 #else
 123         gd->ram_size = fsl_ddr_sdram();
 124 #endif
 125         return 0;
 126 }