LXR uboot/board/freescale/t104xrdb/ddr.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright 2013 Freescale Semiconductor, Inc.
   4 */
   5
   6#include <common.h>
   7#include <i2c.h>
   8#include <hwconfig.h>
   9#include <asm/mmu.h>
  10#include <fsl_ddr_sdram.h>
  11#include <fsl_ddr_dimm_params.h>
  12#include <asm/fsl_law.h>
  13#include <asm/mpc85xx_gpio.h>
  14#include "ddr.h"
  15
  16DECLARE_GLOBAL_DATA_PTR;
  17
  18void fsl_ddr_board_options(memctl_options_t *popts,
  19                                dimm_params_t *pdimm,
  20                                unsigned int ctrl_num)
  21{
  22        const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
  23        ulong ddr_freq;
  24
  25        if (ctrl_num > 1) {
  26                printf("Not supported controller number %d\n", ctrl_num);
  27                return;
  28        }
  29        if (!pdimm->n_ranks)
  30                return;
  31
  32        pbsp = udimms[0];
  33
  34        /* Get clk_adjust according to the board ddr
  35         * freqency and n_banks specified in board_specific_parameters table.
  36         */
  37        ddr_freq = get_ddr_freq(0) / 1000000;
  38        while (pbsp->datarate_mhz_high) {
  39                if (pbsp->n_ranks == pdimm->n_ranks &&
  40                    (pdimm->rank_density >> 30) >= pbsp->rank_gb) {
  41                        if (ddr_freq <= pbsp->datarate_mhz_high) {
  42                                popts->clk_adjust = pbsp->clk_adjust;
  43                                popts->wrlvl_start = pbsp->wrlvl_start;
  44                                popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  45                                popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  46                                goto found;
  47                        }
  48                        pbsp_highest = pbsp;
  49                }
  50                pbsp++;
  51        }
  52
  53        if (pbsp_highest) {
  54                printf("Error: board specific timing not found\n");
  55                printf("for data rate %lu MT/s\n", ddr_freq);
  56                printf("Trying to use the highest speed (%u) parameters\n",
  57                       pbsp_highest->datarate_mhz_high);
  58                popts->clk_adjust = pbsp_highest->clk_adjust;
  59                popts->wrlvl_start = pbsp_highest->wrlvl_start;
  60                popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  61                popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  62        } else {
  63                panic("DIMM is not supported by this board");
  64        }
  65found:
  66        debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
  67                "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, "
  68                "wrlvl_ctrl_3 0x%x\n",
  69                pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
  70                pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
  71                pbsp->wrlvl_ctl_3);
  72
  73        /*
  74         * Factors to consider for half-strength driver enable:
  75         *      - number of DIMMs installed
  76         */
  77#ifdef CONFIG_SYS_FSL_DDR4
  78        popts->half_strength_driver_enable = 1;
  79        /* optimize cpo for erratum A-009942 */
  80        popts->cpo_sample = 0x59;
  81#else
  82        popts->half_strength_driver_enable = 0;
  83#endif
  84        /*
  85         * Write leveling override
  86         */
  87        popts->wrlvl_override = 1;
  88        popts->wrlvl_sample = 0xf;
  89
  90        /*
  91         * rtt and rtt_wr override
  92         */
  93        popts->rtt_override = 0;
  94
  95        /* Enable ZQ calibration */
  96        popts->zq_en = 1;
  97
  98        /* DHC_EN =1, ODT = 75 Ohm */
  99#ifdef CONFIG_SYS_FSL_DDR4
 100        popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_120OHM);
 101        popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_120OHM) |
 102                DDR_CDR2_VREF_OVRD(70);       /* Vref = 70% */
 103#else
 104        popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
 105        popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
 106#endif
 107}
 108
 109#if defined(CONFIG_DEEP_SLEEP)
 110void board_mem_sleep_setup(void)
 111{
 112        void __iomem *cpld_base = (void *)CONFIG_SYS_CPLD_BASE;
 113
 114        /* does not provide HW signals for power management */
 115        clrbits_8(cpld_base + 0x17, 0x40);
 116        /* Disable MCKE isolation */
 117        gpio_set_value(2, 0);
 118        udelay(1);
 119}
 120#endif
 121
 122int dram_init(void)
 123{
 124        phys_size_t dram_size;
 125
 126#if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_RAMBOOT_PBL)
 127        puts("Initializing....using SPD\n");
 128        dram_size = fsl_ddr_sdram();
 129#else
 130        dram_size =  fsl_ddr_sdram_size();
 131#endif
 132        dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 133        dram_size *= 0x100000;
 134
 135#if defined(CONFIG_DEEP_SLEEP) && !defined(CONFIG_SPL_BUILD)
 136        fsl_dp_resume();
 137#endif
 138
 139        gd->ram_size = dram_size;
 140
 141        return 0;
 142}
 143