board/varisys/cyrus/ddr.c

   1 /*
   2  * Based on corenet_ds ddr code
   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
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17
  18 struct board_specific_parameters {
  19         u32 n_ranks;
  20         u32 datarate_mhz_high;
  21         u32 clk_adjust;
  22         u32 wrlvl_start;
  23         u32 cpo;
  24         u32 write_data_delay;
  25         u32 force_2t;
  26 };
  27
  28 /*
  29  * This table contains all valid speeds we want to override with board
  30  * specific parameters. datarate_mhz_high values need to be in ascending order
  31  * for each n_ranks group.
  32  */
  33 static const struct board_specific_parameters udimm0[] = {
  34         /*
  35          * memory controller 0
  36          *   num|  hi|  clk| wrlvl | cpo  |wrdata|2T
  37          * ranks| mhz|adjst| start |      |delay |
  38          */
  39         {4,   850,    4,     6,   0xff,    2,  0},
  40         {4,   950,    5,     7,   0xff,    2,  0},
  41         {4,  1050,    5,     8,   0xff,    2,  0},
  42         {4,  1250,    5,    10,   0xff,    2,  0},
  43         {4,  1350,    5,    11,   0xff,    2,  0},
  44         {4,  1666,    5,    12,   0xff,    2,  0},
  45         {2,   850,    5,     6,   0xff,    2,  0},
  46         {2,  1050,    5,     7,   0xff,    2,  0},
  47         {2,  1250,    4,     6,   0xff,    2,  0},
  48         {2,  1350,    5,     7,   0xff,    2,  0},
  49         {2,  1666,    5,     8,   0xff,    2,  0},
  50         {1,  1250,    4,     6,   0xff,    2,  0},
  51         {1,  1335,    4,     7,   0xff,    2,  0},
  52         {1,  1666,    4,     8,   0xff,    2,  0},
  53         {}
  54 };
  55
  56 /*
  57  * The two slots have slightly different timing. The center values are good
  58  * for both slots. We use identical speed tables for them. In future use, if
  59  * DIMMs have fewer center values that require two separated tables, copy the
  60  * udimm0 table to udimm1 and make changes to clk_adjust and wrlvl_start.
  61  */
  62 static const struct board_specific_parameters *udimms[] = {
  63         udimm0,
  64         udimm0,
  65 };
  66
  67 static const struct board_specific_parameters rdimm0[] = {
  68         /*
  69          * memory controller 0
  70          *   num|  hi|  clk| wrlvl | cpo  |wrdata|2T
  71          * ranks| mhz|adjst| start |      |delay |
  72          */
  73         {4,   850,    4,     6,   0xff,    2,  0},
  74         {4,   950,    5,     7,   0xff,    2,  0},
  75         {4,  1050,    5,     8,   0xff,    2,  0},
  76         {4,  1250,    5,    10,   0xff,    2,  0},
  77         {4,  1350,    5,    11,   0xff,    2,  0},
  78         {4,  1666,    5,    12,   0xff,    2,  0},
  79         {2,   850,    4,     6,   0xff,    2,  0},
  80         {2,  1050,    4,     7,   0xff,    2,  0},
  81         {2,  1666,    4,     8,   0xff,    2,  0},
  82         {1,   850,    4,     5,   0xff,    2,  0},
  83         {1,   950,    4,     7,   0xff,    2,  0},
  84         {1,  1666,    4,     8,   0xff,    2,  0},
  85         {}
  86 };
  87
  88 /*
  89  * The two slots have slightly different timing. See comments above.
  90  */
  91 static const struct board_specific_parameters *rdimms[] = {
  92         rdimm0,
  93         rdimm0,
  94 };
  95
  96 void fsl_ddr_board_options(memctl_options_t *popts,
  97                                 dimm_params_t *pdimm,
  98                                 unsigned int ctrl_num)
  99 {
 100         const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
 101         ulong ddr_freq;
 102
 103         if (ctrl_num > 1) {
 104                 printf("Wrong parameter for controller number %d", ctrl_num);
 105                 return;
 106         }
 107         if (!pdimm->n_ranks)
 108                 return;
 109
 110         if (popts->registered_dimm_en)
 111                 pbsp = rdimms[ctrl_num];
 112         else
 113                 pbsp = udimms[ctrl_num];
 114
 115
 116         /* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
 117          * freqency and n_banks specified in board_specific_parameters table.
 118          */
 119         ddr_freq = get_ddr_freq(0) / 1000000;
 120         while (pbsp->datarate_mhz_high) {
 121                 if (pbsp->n_ranks == pdimm->n_ranks) {
 122                         if (ddr_freq <= pbsp->datarate_mhz_high) {
 123                                 popts->cpo_override = pbsp->cpo;
 124                                 popts->write_data_delay =
 125                                         pbsp->write_data_delay;
 126                                 popts->clk_adjust = pbsp->clk_adjust;
 127                                 popts->wrlvl_start = pbsp->wrlvl_start;
 128                                 popts->twot_en = pbsp->force_2t;
 129                                 goto found;
 130                         }
 131                         pbsp_highest = pbsp;
 132                 }
 133                 pbsp++;
 134         }
 135
 136         if (pbsp_highest) {
 137                 printf("Error: board specific timing not found for data rate %lu MT/s!\nTrying to use the highest speed (%u) parameters\n",
 138                         ddr_freq, pbsp_highest->datarate_mhz_high);
 139                 popts->cpo_override = pbsp_highest->cpo;
 140                 popts->write_data_delay = pbsp_highest->write_data_delay;
 141                 popts->clk_adjust = pbsp_highest->clk_adjust;
 142                 popts->wrlvl_start = pbsp_highest->wrlvl_start;
 143                 popts->twot_en = pbsp_highest->force_2t;
 144         } else {
 145                 panic("DIMM is not supported by this board");
 146         }
 147 found:
 148         /*
 149          * Factors to consider for half-strength driver enable:
 150          *      - number of DIMMs installed
 151          */
 152         popts->half_strength_driver_enable = 0;
 153         /*
 154          * Write leveling override
 155          */
 156         popts->wrlvl_override = 1;
 157         popts->wrlvl_sample = 0xf;
 158
 159         /*
 160          * Rtt and Rtt_WR override
 161          */
 162         popts->rtt_override = 0;
 163
 164         /* Enable ZQ calibration */
 165         popts->zq_en = 1;
 166
 167         /* DHC_EN =1, ODT = 60 Ohm */
 168         popts->ddr_cdr1 = DDR_CDR1_DHC_EN;
 169 }
 170
 171 int initdram(void)
 172 {
 173         phys_size_t dram_size;
 174
 175         puts("Initializing....");
 176
 177         if (!fsl_use_spd())
 178                 panic("Cyrus only supports using SPD for DRAM\n");
 179
 180         puts("using SPD\n");
 181         dram_size = fsl_ddr_sdram();
 182
 183         dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 184         dram_size *= 0x100000;
 185
 186         debug("    DDR: ");
 187         gd->ram_size = dram_size;
 188
 189         return 0;
 190 }