LXR uboot/board/freescale/t208xqds/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 "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        /*
  33         * we use identical timing for all slots. If needed, change the code
  34         * to  pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num];
  35         */
  36        if (popts->registered_dimm_en)
  37                pbsp = rdimms[0];
  38        else
  39                pbsp = udimms[0];
  40
  41        /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
  42         * freqency and n_banks specified in board_specific_parameters table.
  43         */
  44        ddr_freq = get_ddr_freq(0) / 1000000;
  45        while (pbsp->datarate_mhz_high) {
  46                if (pbsp->n_ranks == pdimm->n_ranks &&
  47                    (pdimm->rank_density >> 30) >= pbsp->rank_gb) {
  48                        if (ddr_freq <= pbsp->datarate_mhz_high) {
  49                                popts->clk_adjust = pbsp->clk_adjust;
  50                                popts->wrlvl_start = pbsp->wrlvl_start;
  51                                popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  52                                popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  53                                goto found;
  54                        }
  55                        pbsp_highest = pbsp;
  56                }
  57                pbsp++;
  58        }
  59
  60        if (pbsp_highest) {
  61                printf("Error: board specific timing not found");
  62                printf("for data rate %lu MT/s\n", ddr_freq);
  63                printf("Trying to use the highest speed (%u) parameters\n",
  64                       pbsp_highest->datarate_mhz_high);
  65                popts->clk_adjust = pbsp_highest->clk_adjust;
  66                popts->wrlvl_start = pbsp_highest->wrlvl_start;
  67                popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
  68                popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
  69        } else {
  70                panic("DIMM is not supported by this board");
  71        }
  72found:
  73        debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n"
  74                "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, "
  75                "wrlvl_ctrl_3 0x%x\n",
  76                pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
  77                pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
  78                pbsp->wrlvl_ctl_3);
  79
  80        /*
  81         * Factors to consider for half-strength driver enable:
  82         *      - number of DIMMs installed
  83         */
  84        popts->half_strength_driver_enable = 0;
  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        popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
 101        popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
 102
 103        /* optimize cpo for erratum A-009942 */
 104        popts->cpo_sample = 0x64;
 105}
 106
 107int dram_init(void)
 108{
 109        phys_size_t dram_size;
 110
 111#if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_RAMBOOT_PBL)
 112        puts("Initializing....using SPD\n");
 113        dram_size = fsl_ddr_sdram();
 114#else
 115        /* DDR has been initialised by first stage boot loader */
 116        dram_size =  fsl_ddr_sdram_size();
 117#endif
 118        dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 119        dram_size *= 0x100000;
 120
 121        gd->ram_size = dram_size;
 122
 123        return 0;
 124}
 125