board/freescale/corenet_ds/ddr.c

   1 /*
   2  * Copyright 2009-2011 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * Version 2 as published by the Free Software Foundation.
   7  */
   8
   9 #include <common.h>
  10 #include <i2c.h>
  11 #include <hwconfig.h>
  12 #include <asm/mmu.h>
  13 #include <asm/fsl_ddr_sdram.h>
  14 #include <asm/fsl_ddr_dimm_params.h>
  15 #include <asm/fsl_law.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19
  20 /*
  21  * Fixed sdram init -- doesn't use serial presence detect.
  22  */
  23 extern fixed_ddr_parm_t fixed_ddr_parm_0[];
  24 #if (CONFIG_NUM_DDR_CONTROLLERS == 2)
  25 extern fixed_ddr_parm_t fixed_ddr_parm_1[];
  26 #endif
  27
  28 phys_size_t fixed_sdram(void)
  29 {
  30         int i;
  31         char buf[32];
  32         fsl_ddr_cfg_regs_t ddr_cfg_regs;
  33         phys_size_t ddr_size;
  34         unsigned int lawbar1_target_id;
  35         ulong ddr_freq, ddr_freq_mhz;
  36
  37         ddr_freq = get_ddr_freq(0);
  38         ddr_freq_mhz = ddr_freq / 1000000;
  39
  40         printf("Configuring DDR for %s MT/s data rate\n",
  41                                 strmhz(buf, ddr_freq));
  42
  43         for (i = 0; fixed_ddr_parm_0[i].max_freq > 0; i++) {
  44                 if ((ddr_freq_mhz > fixed_ddr_parm_0[i].min_freq) &&
  45                    (ddr_freq_mhz <= fixed_ddr_parm_0[i].max_freq)) {
  46                         memcpy(&ddr_cfg_regs,
  47                                 fixed_ddr_parm_0[i].ddr_settings,
  48                                 sizeof(ddr_cfg_regs));
  49                         break;
  50                 }
  51         }
  52
  53         if (fixed_ddr_parm_0[i].max_freq == 0)
  54                 panic("Unsupported DDR data rate %s MT/s data rate\n",
  55                         strmhz(buf, ddr_freq));
  56
  57         ddr_size = (phys_size_t) CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
  58         ddr_cfg_regs.ddr_cdr1 = DDR_CDR1_DHC_EN;
  59         fsl_ddr_set_memctl_regs(&ddr_cfg_regs, 0);
  60
  61 #if (CONFIG_NUM_DDR_CONTROLLERS == 2)
  62         memcpy(&ddr_cfg_regs,
  63                 fixed_ddr_parm_1[i].ddr_settings,
  64                 sizeof(ddr_cfg_regs));
  65         ddr_cfg_regs.ddr_cdr1 = DDR_CDR1_DHC_EN;
  66         fsl_ddr_set_memctl_regs(&ddr_cfg_regs, 1);
  67 #endif
  68
  69         /*
  70          * setup laws for DDR. If not interleaving, presuming half memory on
  71          * DDR1 and the other half on DDR2
  72          */
  73         if (fixed_ddr_parm_0[i].ddr_settings->cs[0].config & 0x20000000) {
  74                 if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE,
  75                                  ddr_size,
  76                                  LAW_TRGT_IF_DDR_INTRLV) < 0) {
  77                         printf("ERROR setting Local Access Windows for DDR\n");
  78                         return 0;
  79                 }
  80         } else {
  81 #if (CONFIG_NUM_DDR_CONTROLLERS == 2)
  82                 /* We require both controllers have identical DIMMs */
  83                 lawbar1_target_id = LAW_TRGT_IF_DDR_1;
  84                 if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE,
  85                                  ddr_size / 2,
  86                                  lawbar1_target_id) < 0) {
  87                         printf("ERROR setting Local Access Windows for DDR\n");
  88                         return 0;
  89                 }
  90                 lawbar1_target_id = LAW_TRGT_IF_DDR_2;
  91                 if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE + ddr_size / 2,
  92                                  ddr_size / 2,
  93                                  lawbar1_target_id) < 0) {
  94                         printf("ERROR setting Local Access Windows for DDR\n");
  95                         return 0;
  96                 }
  97 #else
  98                 lawbar1_target_id = LAW_TRGT_IF_DDR_1;
  99                 if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE,
 100                                  ddr_size,
 101                                  lawbar1_target_id) < 0) {
 102                         printf("ERROR setting Local Access Windows for DDR\n");
 103                         return 0;
 104                 }
 105 #endif
 106         }
 107         return ddr_size;
 108 }
 109
 110 typedef struct {
 111         u32 datarate_mhz_low;
 112         u32 datarate_mhz_high;
 113         u32 n_ranks;
 114         u32 clk_adjust;
 115         u32 wrlvl_start;
 116         u32 cpo;
 117         u32 write_data_delay;
 118         u32 force_2T;
 119 } board_specific_parameters_t;
 120
 121 /* ranges for parameters:
 122  *  wr_data_delay = 0-6
 123  *  clk adjust = 0-8
 124  *  cpo 2-0x1E (30)
 125  */
 126
 127
 128 /* XXX: these values need to be checked for all interleaving modes.  */
 129 /* XXX: No reliable dual-rank 800 MHz setting has been found.  It may
 130  *      seem reliable, but errors will appear when memory intensive
 131  *      program is run. */
 132 /* XXX: Single rank at 800 MHz is OK.  */
 133 const board_specific_parameters_t board_specific_parameters[][30] = {
 134         {
 135         /*
 136          * memory controller 0
 137          *  lo|  hi|  num|  clk| wrlvl | cpo  |wrdata|2T
 138          * mhz| mhz|ranks|adjst| start | delay|
 139          */
 140                 {  0, 850,    4,    4,     6,   0xff,    2,  0},
 141                 {851, 950,    4,    5,     7,   0xff,    2,  0},
 142                 {951, 1050,   4,    5,     8,   0xff,    2,  0},
 143                 {1051, 1250,  4,    5,    10,   0xff,    2,  0},
 144                 {1251, 1350,  4,    5,    11,   0xff,    2,  0},
 145                 {  0, 850,    2,    5,     6,   0xff,    2,  0},
 146                 {851, 950,    2,    5,     7,   0xff,    2,  0},
 147                 {951, 1050,   2,    5,     7,   0xff,    2,  0},
 148                 {1051, 1250,  2,    4,     6,   0xff,    2,  0},
 149                 {1251, 1350,  2,    5,     7,   0xff,    2,  0},
 150         },
 151
 152         {
 153         /*
 154          * memory controller 1
 155          *  lo|  hi|  num|  clk| wrlvl | cpo  |wrdata|2T
 156          * mhz| mhz|ranks|adjst| start | delay|
 157          */
 158                 {  0, 850,    4,    4,     6,   0xff,    2,  0},
 159                 {851, 950,    4,    5,     7,   0xff,    2,  0},
 160                 {951, 1050,   4,    5,     8,   0xff,    2,  0},
 161                 {1051, 1250,  4,    5,    10,   0xff,    2,  0},
 162                 {1251, 1350,  4,    5,    11,   0xff,    2,  0},
 163                 {  0, 850,    2,    5,     6,   0xff,    2,  0},
 164                 {851, 950,    2,    5,     7,   0xff,    2,  0},
 165                 {951, 1050,   2,    5,     7,   0xff,    2,  0},
 166                 {1051, 1250,  2,    4,     6,   0xff,    2,  0},
 167                 {1251, 1350,  2,    5,     7,   0xff,    2,  0},
 168         }
 169 };
 170
 171 void fsl_ddr_board_options(memctl_options_t *popts,
 172                                 dimm_params_t *pdimm,
 173                                 unsigned int ctrl_num)
 174 {
 175         const board_specific_parameters_t *pbsp =
 176                                 &(board_specific_parameters[ctrl_num][0]);
 177         u32 num_params = sizeof(board_specific_parameters[ctrl_num]) /
 178                                 sizeof(board_specific_parameters[0][0]);
 179         u32 i;
 180         ulong ddr_freq;
 181
 182         /* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
 183          * freqency and n_banks specified in board_specific_parameters table.
 184          */
 185         ddr_freq = get_ddr_freq(0) / 1000000;
 186         for (i = 0; i < num_params; i++) {
 187                 if (ddr_freq >= pbsp->datarate_mhz_low &&
 188                         ddr_freq <= pbsp->datarate_mhz_high &&
 189                         pdimm[0].n_ranks == pbsp->n_ranks) {
 190                         popts->cpo_override = pbsp->cpo;
 191                         popts->write_data_delay = pbsp->write_data_delay;
 192                         popts->clk_adjust = pbsp->clk_adjust;
 193                         popts->wrlvl_start = pbsp->wrlvl_start;
 194                         popts->twoT_en = pbsp->force_2T;
 195                         break;
 196                 }
 197                 pbsp++;
 198         }
 199
 200         if (i == num_params) {
 201                 printf("Warning: board specific timing not found "
 202                         "for data rate %lu MT/s!\n", ddr_freq);
 203         }
 204
 205         /*
 206          * Factors to consider for half-strength driver enable:
 207          *      - number of DIMMs installed
 208          */
 209         popts->half_strength_driver_enable = 0;
 210         /*
 211          * Write leveling override
 212          */
 213         popts->wrlvl_override = 1;
 214         popts->wrlvl_sample = 0xf;
 215
 216         /*
 217          * Rtt and Rtt_WR override
 218          */
 219         popts->rtt_override = 0;
 220
 221         /* Enable ZQ calibration */
 222         popts->zq_en = 1;
 223
 224         /* DHC_EN =1, ODT = 60 Ohm */
 225         popts->ddr_cdr1 = DDR_CDR1_DHC_EN;
 226
 227         /* override SPD values. rcw_2 should vary at differnt speed */
 228         if (pdimm[0].registered_dimm == 1) {
 229                 popts->rcw_override = 1;
 230                 popts->rcw_1 = 0x000a5a00;
 231                 if (ddr_freq <= 800)
 232                         popts->rcw_2 = 0x00000000;
 233                 else if (ddr_freq <= 1066)
 234                         popts->rcw_2 = 0x00100000;
 235                 else if (ddr_freq <= 1333)
 236                         popts->rcw_2 = 0x00200000;
 237                 else
 238                         popts->rcw_2 = 0x00300000;
 239         }
 240 }
 241
 242 phys_size_t initdram(int board_type)
 243 {
 244         phys_size_t dram_size;
 245
 246         puts("Initializing....");
 247
 248         if (fsl_use_spd()) {
 249                 puts("using SPD\n");
 250                 dram_size = fsl_ddr_sdram();
 251         } else {
 252                 puts("using fixed parameters\n");
 253                 dram_size = fixed_sdram();
 254         }
 255
 256         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 257         dram_size *= 0x100000;
 258
 259         puts("    DDR: ");
 260         return dram_size;
 261 }