board/freescale/t104xrdb/ddr.c

   1 /*
   2  * Copyright 2013 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 > 1) {
  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 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 #ifdef CONFIG_SYS_FSL_DDR4
  79         popts->half_strength_driver_enable = 1;
  80         /* optimize cpo for erratum A-009942 */
  81         popts->cpo_sample = 0x59;
  82 #else
  83         popts->half_strength_driver_enable = 0;
  84 #endif
  85         /*
  86          * Write leveling override
  87          */
  88         popts->wrlvl_override = 1;
  89         popts->wrlvl_sample = 0xf;
  90
  91         /*
  92          * rtt and rtt_wr override
  93          */
  94         popts->rtt_override = 0;
  95
  96         /* Enable ZQ calibration */
  97         popts->zq_en = 1;
  98
  99         /* DHC_EN =1, ODT = 75 Ohm */
 100 #ifdef CONFIG_SYS_FSL_DDR4
 101         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_120OHM);
 102         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_120OHM) |
 103                 DDR_CDR2_VREF_OVRD(70);       /* Vref = 70% */
 104 #else
 105         popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
 106         popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
 107 #endif
 108 }
 109
 110 #if defined(CONFIG_DEEP_SLEEP)
 111 void board_mem_sleep_setup(void)
 112 {
 113         void __iomem *cpld_base = (void *)CONFIG_SYS_CPLD_BASE;
 114
 115         /* does not provide HW signals for power management */
 116         clrbits_8(cpld_base + 0x17, 0x40);
 117         /* Disable MCKE isolation */
 118         gpio_set_value(2, 0);
 119         udelay(1);
 120 }
 121 #endif
 122
 123 int initdram(void)
 124 {
 125         phys_size_t dram_size;
 126
 127 #if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_RAMBOOT_PBL)
 128         puts("Initializing....using SPD\n");
 129         dram_size = fsl_ddr_sdram();
 130 #else
 131         dram_size =  fsl_ddr_sdram_size();
 132 #endif
 133         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 134         dram_size *= 0x100000;
 135
 136 #if defined(CONFIG_DEEP_SLEEP) && !defined(CONFIG_SPL_BUILD)
 137         fsl_dp_resume();
 138 #endif
 139
 140         gd->ram_size = dram_size;
 141
 142         return 0;
 143 }