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 extern void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
  20                                    unsigned int ctrl_num);
  21
  22
  23 /*
  24  * Fixed sdram init -- doesn't use serial presence detect.
  25  */
  26 extern fixed_ddr_parm_t fixed_ddr_parm_0[];
  27 #if (CONFIG_NUM_DDR_CONTROLLERS == 2)
  28 extern fixed_ddr_parm_t fixed_ddr_parm_1[];
  29 #endif
  30
  31 phys_size_t fixed_sdram(void)
  32 {
  33         int i;
  34         sys_info_t sysinfo;
  35         char buf[32];
  36         fsl_ddr_cfg_regs_t ddr_cfg_regs;
  37         phys_size_t ddr_size;
  38         unsigned int lawbar1_target_id;
  39
  40         get_sys_info(&sysinfo);
  41         printf("Configuring DDR for %s MT/s data rate\n",
  42                                 strmhz(buf, sysinfo.freqDDRBus));
  43
  44         for (i = 0; fixed_ddr_parm_0[i].max_freq > 0; i++) {
  45                 if ((sysinfo.freqDDRBus > fixed_ddr_parm_0[i].min_freq) &&
  46                    (sysinfo.freqDDRBus <= fixed_ddr_parm_0[i].max_freq)) {
  47                         memcpy(&ddr_cfg_regs,
  48                                 fixed_ddr_parm_0[i].ddr_settings,
  49                                 sizeof(ddr_cfg_regs));
  50                         break;
  51                 }
  52         }
  53
  54         if (fixed_ddr_parm_0[i].max_freq == 0)
  55                 panic("Unsupported DDR data rate %s MT/s data rate\n",
  56                         strmhz(buf, sysinfo.freqDDRBus));
  57
  58         ddr_size = (phys_size_t) CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
  59         ddr_cfg_regs.ddr_cdr1 = DDR_CDR1_DHC_EN;
  60         fsl_ddr_set_memctl_regs(&ddr_cfg_regs, 0);
  61
  62 #if (CONFIG_NUM_DDR_CONTROLLERS == 2)
  63         memcpy(&ddr_cfg_regs,
  64                 fixed_ddr_parm_1[i].ddr_settings,
  65                 sizeof(ddr_cfg_regs));
  66         ddr_cfg_regs.ddr_cdr1 = DDR_CDR1_DHC_EN;
  67         fsl_ddr_set_memctl_regs(&ddr_cfg_regs, 1);
  68 #endif
  69
  70         /*
  71          * setup laws for DDR. If not interleaving, presuming half memory on
  72          * DDR1 and the other half on DDR2
  73          */
  74         if (fixed_ddr_parm_0[i].ddr_settings->cs[0].config & 0x20000000) {
  75                 if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE,
  76                                  ddr_size,
  77                                  LAW_TRGT_IF_DDR_INTRLV) < 0) {
  78                         printf("ERROR setting Local Access Windows for DDR\n");
  79                         return 0;
  80                 }
  81         } else {
  82 #if (CONFIG_NUM_DDR_CONTROLLERS == 2)
  83                 /* We require both controllers have identical DIMMs */
  84                 lawbar1_target_id = LAW_TRGT_IF_DDR_1;
  85                 if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE,
  86                                  ddr_size / 2,
  87                                  lawbar1_target_id) < 0) {
  88                         printf("ERROR setting Local Access Windows for DDR\n");
  89                         return 0;
  90                 }
  91                 lawbar1_target_id = LAW_TRGT_IF_DDR_2;
  92                 if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE + ddr_size / 2,
  93                                  ddr_size / 2,
  94                                  lawbar1_target_id) < 0) {
  95                         printf("ERROR setting Local Access Windows for DDR\n");
  96                         return 0;
  97                 }
  98 #else
  99                 lawbar1_target_id = LAW_TRGT_IF_DDR_1;
 100                 if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE,
 101                                  ddr_size,
 102                                  lawbar1_target_id) < 0) {
 103                         printf("ERROR setting Local Access Windows for DDR\n");
 104                         return 0;
 105                 }
 106 #endif
 107         }
 108         return ddr_size;
 109 }
 110
 111 static void get_spd(ddr3_spd_eeprom_t *spd, unsigned char i2c_address)
 112 {
 113         int ret;
 114
 115         ret = i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr3_spd_eeprom_t));
 116         if (ret) {
 117                 debug("DDR: failed to read SPD from address %u\n", i2c_address);
 118                 memset(spd, 0, sizeof(ddr3_spd_eeprom_t));
 119         }
 120 }
 121
 122 unsigned int fsl_ddr_get_mem_data_rate(void)
 123 {
 124         return get_ddr_freq(0);
 125 }
 126
 127 void fsl_ddr_get_spd(ddr3_spd_eeprom_t *ctrl_dimms_spd,
 128                       unsigned int ctrl_num)
 129 {
 130         unsigned int i;
 131         unsigned int i2c_address = 0;
 132
 133         for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
 134                 if (ctrl_num == 0 && i == 0)
 135                         i2c_address = SPD_EEPROM_ADDRESS1;
 136                 else if (ctrl_num == 1 && i == 0)
 137                         i2c_address = SPD_EEPROM_ADDRESS2;
 138
 139                 get_spd(&(ctrl_dimms_spd[i]), i2c_address);
 140         }
 141 }
 142
 143 typedef struct {
 144         u32 datarate_mhz_low;
 145         u32 datarate_mhz_high;
 146         u32 n_ranks;
 147         u32 clk_adjust;
 148         u32 wrlvl_start;
 149         u32 cpo;
 150         u32 write_data_delay;
 151         u32 force_2T;
 152 } board_specific_parameters_t;
 153
 154 /* ranges for parameters:
 155  *  wr_data_delay = 0-6
 156  *  clk adjust = 0-8
 157  *  cpo 2-0x1E (30)
 158  */
 159
 160
 161 /* XXX: these values need to be checked for all interleaving modes.  */
 162 /* XXX: No reliable dual-rank 800 MHz setting has been found.  It may
 163  *      seem reliable, but errors will appear when memory intensive
 164  *      program is run. */
 165 /* XXX: Single rank at 800 MHz is OK.  */
 166 const board_specific_parameters_t board_specific_parameters[][30] = {
 167         {
 168         /*
 169          * memory controller 0
 170          *  lo|  hi|  num|  clk| wrlvl | cpo  |wrdata|2T
 171          * mhz| mhz|ranks|adjst| start | delay|
 172          */
 173                 {  0, 850,    4,    4,     6,   0xff,    2,  0},
 174                 {851, 950,    4,    5,     7,   0xff,    2,  0},
 175                 {951, 1050,   4,    5,     8,   0xff,    2,  0},
 176                 {1051, 1250,  4,    5,    10,   0xff,    2,  0},
 177                 {1251, 1350,  4,    5,    11,   0xff,    2,  0},
 178                 {  0, 850,    2,    5,     6,   0xff,    2,  0},
 179                 {851, 950,    2,    5,     7,   0xff,    2,  0},
 180                 {951, 1050,   2,    5,     7,   0xff,    2,  0},
 181                 {1051, 1250,  2,    4,     6,   0xff,    2,  0},
 182                 {1251, 1350,  2,    5,     7,   0xff,    2,  0},
 183         },
 184
 185         {
 186         /*
 187          * memory controller 1
 188          *  lo|  hi|  num|  clk| wrlvl | cpo  |wrdata|2T
 189          * mhz| mhz|ranks|adjst| start | delay|
 190          */
 191                 {  0, 850,    4,    4,     6,   0xff,    2,  0},
 192                 {851, 950,    4,    5,     7,   0xff,    2,  0},
 193                 {951, 1050,   4,    5,     8,   0xff,    2,  0},
 194                 {1051, 1250,  4,    5,    10,   0xff,    2,  0},
 195                 {1251, 1350,  4,    5,    11,   0xff,    2,  0},
 196                 {  0, 850,    2,    5,     6,   0xff,    2,  0},
 197                 {851, 950,    2,    5,     7,   0xff,    2,  0},
 198                 {951, 1050,   2,    5,     7,   0xff,    2,  0},
 199                 {1051, 1250,  2,    4,     6,   0xff,    2,  0},
 200                 {1251, 1350,  2,    5,     7,   0xff,    2,  0},
 201         }
 202 };
 203
 204 void fsl_ddr_board_options(memctl_options_t *popts,
 205                                 dimm_params_t *pdimm,
 206                                 unsigned int ctrl_num)
 207 {
 208         const board_specific_parameters_t *pbsp =
 209                                 &(board_specific_parameters[ctrl_num][0]);
 210         u32 num_params = sizeof(board_specific_parameters[ctrl_num]) /
 211                                 sizeof(board_specific_parameters[0][0]);
 212         u32 i;
 213         ulong ddr_freq;
 214
 215         /* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
 216          * freqency and n_banks specified in board_specific_parameters table.
 217          */
 218         ddr_freq = get_ddr_freq(0) / 1000000;
 219         for (i = 0; i < num_params; i++) {
 220                 if (ddr_freq >= pbsp->datarate_mhz_low &&
 221                         ddr_freq <= pbsp->datarate_mhz_high &&
 222                         pdimm[0].n_ranks == pbsp->n_ranks) {
 223                         popts->cpo_override = pbsp->cpo;
 224                         popts->write_data_delay = pbsp->write_data_delay;
 225                         popts->clk_adjust = pbsp->clk_adjust;
 226                         popts->wrlvl_start = pbsp->wrlvl_start;
 227                         popts->twoT_en = pbsp->force_2T;
 228                 }
 229                 pbsp++;
 230         }
 231
 232         /*
 233          * Factors to consider for half-strength driver enable:
 234          *      - number of DIMMs installed
 235          */
 236         popts->half_strength_driver_enable = 0;
 237         /*
 238          * Write leveling override
 239          */
 240         popts->wrlvl_override = 1;
 241         popts->wrlvl_sample = 0xf;
 242
 243         /*
 244          * Rtt and Rtt_WR override
 245          */
 246         popts->rtt_override = 0;
 247
 248         /* Enable ZQ calibration */
 249         popts->zq_en = 1;
 250
 251         /* DHC_EN =1, ODT = 60 Ohm */
 252         popts->ddr_cdr1 = DDR_CDR1_DHC_EN;
 253
 254         /* override SPD values. rcw_2 should vary at differnt speed */
 255         if (pdimm[0].n_ranks == 4) {
 256                 popts->rcw_override = 1;
 257                 popts->rcw_1 = 0x000a5a00;
 258                 if (ddr_freq <= 800)
 259                         popts->rcw_2 = 0x00000000;
 260                 else if (ddr_freq <= 1066)
 261                         popts->rcw_2 = 0x00100000;
 262                 else if (ddr_freq <= 1333)
 263                         popts->rcw_2 = 0x00200000;
 264                 else
 265                         popts->rcw_2 = 0x00300000;
 266         }
 267 }
 268
 269 phys_size_t initdram(int board_type)
 270 {
 271         phys_size_t dram_size;
 272
 273         puts("Initializing....");
 274
 275         if (fsl_use_spd()) {
 276                 puts("using SPD\n");
 277                 dram_size = fsl_ddr_sdram();
 278         } else {
 279                 puts("using fixed parameters\n");
 280                 dram_size = fixed_sdram();
 281         }
 282
 283         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 284         dram_size *= 0x100000;
 285
 286         puts("    DDR: ");
 287         return dram_size;
 288 }