sim/bfin/dv-bfin_ebiu_sdc.c

   1 /* Blackfin External Bus Interface Unit (EBIU) SDRAM Controller (SDC) Model.
   2
   3    Copyright (C) 2010-2020 Free Software Foundation, Inc.
   4    Contributed by Analog Devices, Inc.
   5
   6    This file is part of simulators.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22
  23 #include "sim-main.h"
  24 #include "devices.h"
  25 #include "dv-bfin_ebiu_sdc.h"
  26
  27 struct bfin_ebiu_sdc
  28 {
  29   bu32 base;
  30   int type;
  31   bu32 reg_size, bank_size;
  32
  33   /* Order after here is important -- matches hardware MMR layout.  */
  34   bu32 sdgctl;
  35   bu32 sdbctl;  /* 16bit on most parts ... */
  36   bu16 BFIN_MMR_16(sdrrc);
  37   bu16 BFIN_MMR_16(sdstat);
  38 };
  39 #define mmr_base()      offsetof(struct bfin_ebiu_sdc, sdgctl)
  40 #define mmr_offset(mmr) (offsetof(struct bfin_ebiu_sdc, mmr) - mmr_base())
  41
  42 static const char * const mmr_names[] =
  43 {
  44   "EBIU_SDGCTL", "EBIU_SDBCTL", "EBIU_SDRRC", "EBIU_SDSTAT",
  45 };
  46 #define mmr_name(off) mmr_names[(off) / 4]
  47
  48 static unsigned
  49 bfin_ebiu_sdc_io_write_buffer (struct hw *me, const void *source,
  50                                int space, address_word addr, unsigned nr_bytes)
  51 {
  52   struct bfin_ebiu_sdc *sdc = hw_data (me);
  53   bu32 mmr_off;
  54   bu32 value;
  55   bu16 *value16p;
  56   bu32 *value32p;
  57   void *valuep;
  58
  59   /* Invalid access mode is higher priority than missing register.  */
  60   if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, true))
  61     return 0;
  62
  63   if (nr_bytes == 4)
  64     value = dv_load_4 (source);
  65   else
  66     value = dv_load_2 (source);
  67
  68   mmr_off = addr - sdc->base;
  69   valuep = (void *)((unsigned long)sdc + mmr_base() + mmr_off);
  70   value16p = valuep;
  71   value32p = valuep;
  72
  73   HW_TRACE_WRITE ();
  74
  75   switch (mmr_off)
  76     {
  77     case mmr_offset(sdgctl):
  78       /* XXX: SRFS should make external mem unreadable.  */
  79       *value32p = value;
  80       break;
  81     case mmr_offset(sdbctl):
  82       if (sdc->type == 561)
  83         {
  84           if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, true))
  85             return 0;
  86           *value32p = value;
  87         }
  88       else
  89         {
  90           if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true))
  91             return 0;
  92           *value16p = value;
  93         }
  94       break;
  95     case mmr_offset(sdrrc):
  96       if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true))
  97         return 0;
  98       *value16p = value;
  99       break;
 100     case mmr_offset(sdstat):
 101       if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true))
 102         return 0;
 103       /* XXX: Some bits are W1C ...  */
 104       break;
 105     }
 106
 107   return nr_bytes;
 108 }
 109
 110 static unsigned
 111 bfin_ebiu_sdc_io_read_buffer (struct hw *me, void *dest,
 112                               int space, address_word addr, unsigned nr_bytes)
 113 {
 114   struct bfin_ebiu_sdc *sdc = hw_data (me);
 115   bu32 mmr_off;
 116   bu32 *value32p;
 117   bu16 *value16p;
 118   void *valuep;
 119
 120   /* Invalid access mode is higher priority than missing register.  */
 121   if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, false))
 122     return 0;
 123
 124   mmr_off = addr - sdc->base;
 125   valuep = (void *)((unsigned long)sdc + mmr_base() + mmr_off);
 126   value16p = valuep;
 127   value32p = valuep;
 128
 129   HW_TRACE_READ ();
 130
 131   switch (mmr_off)
 132     {
 133     case mmr_offset(sdgctl):
 134       dv_store_4 (dest, *value32p);
 135       break;
 136     case mmr_offset(sdbctl):
 137       if (sdc->type == 561)
 138         {
 139           if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, false))
 140             return 0;
 141           dv_store_4 (dest, *value32p);
 142         }
 143       else
 144         {
 145           if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false))
 146             return 0;
 147           dv_store_2 (dest, *value16p);
 148         }
 149       break;
 150     case mmr_offset(sdrrc):
 151     case mmr_offset(sdstat):
 152       if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false))
 153         return 0;
 154       dv_store_2 (dest, *value16p);
 155       break;
 156     }
 157
 158   return nr_bytes;
 159 }
 160
 161 static void
 162 attach_bfin_ebiu_sdc_regs (struct hw *me, struct bfin_ebiu_sdc *sdc)
 163 {
 164   address_word attach_address;
 165   int attach_space;
 166   unsigned attach_size;
 167   reg_property_spec reg;
 168
 169   if (hw_find_property (me, "reg") == NULL)
 170     hw_abort (me, "Missing \"reg\" property");
 171
 172   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 173     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 174
 175   hw_unit_address_to_attach_address (hw_parent (me),
 176                                      &reg.address,
 177                                      &attach_space, &attach_address, me);
 178   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 179
 180   if (attach_size != BFIN_MMR_EBIU_SDC_SIZE)
 181     hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_EBIU_SDC_SIZE);
 182
 183   hw_attach_address (hw_parent (me),
 184                      0, attach_space, attach_address, attach_size, me);
 185
 186   sdc->base = attach_address;
 187 }
 188
 189 static void
 190 bfin_ebiu_sdc_finish (struct hw *me)
 191 {
 192   struct bfin_ebiu_sdc *sdc;
 193
 194   sdc = HW_ZALLOC (me, struct bfin_ebiu_sdc);
 195
 196   set_hw_data (me, sdc);
 197   set_hw_io_read_buffer (me, bfin_ebiu_sdc_io_read_buffer);
 198   set_hw_io_write_buffer (me, bfin_ebiu_sdc_io_write_buffer);
 199
 200   attach_bfin_ebiu_sdc_regs (me, sdc);
 201
 202   sdc->type = hw_find_integer_property (me, "type");
 203
 204   /* Initialize the SDC.  */
 205   sdc->sdgctl = 0xE0088849;
 206   sdc->sdbctl = 0x00000000;
 207   sdc->sdrrc = 0x081A;
 208   sdc->sdstat = 0x0008;
 209
 210   /* XXX: We boot with 64M external memory by default ...  */
 211   sdc->sdbctl |= EBE | EBSZ_64 | EBCAW_10;
 212 }
 213
 214 const struct hw_descriptor dv_bfin_ebiu_sdc_descriptor[] =
 215 {
 216   {"bfin_ebiu_sdc", bfin_ebiu_sdc_finish,},
 217   {NULL, NULL},
 218 };