sim/bfin/dv-bfin_nfc.c

   1 /* Blackfin NAND Flash Memory Controller (NFC) model
   2
   3    Copyright (C) 2010-2013 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_nfc.h"
  26
  27 /* XXX: This is merely a stub.  */
  28
  29 struct bfin_nfc
  30 {
  31   /* This top portion matches common dv_bfin struct.  */
  32   bu32 base;
  33   struct hw *dma_master;
  34   bool acked;
  35
  36   struct hw_event *handler;
  37   char saved_byte;
  38   int saved_count;
  39
  40   /* Order after here is important -- matches hardware MMR layout.  */
  41   bu16 BFIN_MMR_16(ctl);
  42   bu16 BFIN_MMR_16(stat);
  43   bu16 BFIN_MMR_16(irqstat);
  44   bu16 BFIN_MMR_16(irqmask);
  45   bu16 BFIN_MMR_16(ecc0);
  46   bu16 BFIN_MMR_16(ecc1);
  47   bu16 BFIN_MMR_16(ecc2);
  48   bu16 BFIN_MMR_16(ecc3);
  49   bu16 BFIN_MMR_16(count);
  50   bu16 BFIN_MMR_16(rst);
  51   bu16 BFIN_MMR_16(pgctl);
  52   bu16 BFIN_MMR_16(read);
  53   bu32 _pad0[4];
  54   bu16 BFIN_MMR_16(addr);
  55   bu16 BFIN_MMR_16(cmd);
  56   bu16 BFIN_MMR_16(data_wr);
  57   bu16 BFIN_MMR_16(data_rd);
  58 };
  59 #define mmr_base()      offsetof(struct bfin_nfc, ctl)
  60 #define mmr_offset(mmr) (offsetof(struct bfin_nfc, mmr) - mmr_base())
  61 #define mmr_idx(mmr)    (mmr_offset (mmr) / 4)
  62
  63 static const char * const mmr_names[] =
  64 {
  65   "NFC_CTL", "NFC_STAT", "NFC_IRQSTAT", "NFC_IRQMASK", "NFC_ECC0", "NFC_ECC1",
  66   "NFC_ECC2", "NFC_ECC3", "NFC_COUNT", "NFC_RST", "NFC_PGCTL", "NFC_READ",
  67   [mmr_idx (addr)] = "NFC_ADDR", "NFC_CMD", "NFC_DATA_WR", "NFC_DATA_RD",
  68 };
  69 #define mmr_name(off) (mmr_names[(off) / 4] ? : "<INV>")
  70
  71 static unsigned
  72 bfin_nfc_io_write_buffer (struct hw *me, const void *source, int space,
  73                           address_word addr, unsigned nr_bytes)
  74 {
  75   struct bfin_nfc *nfc = hw_data (me);
  76   bu32 mmr_off;
  77   bu32 value;
  78   bu16 *valuep;
  79
  80   value = dv_load_2 (source);
  81   mmr_off = addr - nfc->base;
  82   valuep = (void *)((unsigned long)nfc + mmr_base() + mmr_off);
  83
  84   HW_TRACE_WRITE ();
  85
  86   dv_bfin_mmr_require_16 (me, addr, nr_bytes, true);
  87
  88   switch (mmr_off)
  89     {
  90     case mmr_offset(ctl):
  91     case mmr_offset(stat):
  92     case mmr_offset(irqmask):
  93     case mmr_offset(ecc0):
  94     case mmr_offset(ecc1):
  95     case mmr_offset(ecc2):
  96     case mmr_offset(ecc3):
  97     case mmr_offset(count):
  98     case mmr_offset(rst):
  99     case mmr_offset(pgctl):
 100     case mmr_offset(read):
 101     case mmr_offset(addr):
 102     case mmr_offset(cmd):
 103     case mmr_offset(data_wr):
 104       *valuep = value;
 105       break;
 106     case mmr_offset(data_rd):
 107       nfc->irqstat |= RD_RDY;
 108       *valuep = value;
 109       break;
 110     case mmr_offset(irqstat):
 111       dv_w1c_2 (valuep, value, -1);
 112       break;
 113     default:
 114       dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
 115       break;
 116     }
 117
 118   return nr_bytes;
 119 }
 120
 121 static unsigned
 122 bfin_nfc_io_read_buffer (struct hw *me, void *dest, int space,
 123                          address_word addr, unsigned nr_bytes)
 124 {
 125   struct bfin_nfc *nfc = hw_data (me);
 126   bu32 mmr_off;
 127   bu16 *valuep;
 128
 129   mmr_off = addr - nfc->base;
 130   valuep = (void *)((unsigned long)nfc + mmr_base() + mmr_off);
 131
 132   HW_TRACE_READ ();
 133
 134   dv_bfin_mmr_require_16 (me, addr, nr_bytes, false);
 135
 136   switch (mmr_off)
 137     {
 138     case mmr_offset(ctl):
 139     case mmr_offset(stat):
 140     case mmr_offset(irqstat):
 141     case mmr_offset(irqmask):
 142     case mmr_offset(ecc0):
 143     case mmr_offset(ecc1):
 144     case mmr_offset(ecc2):
 145     case mmr_offset(ecc3):
 146     case mmr_offset(count):
 147     case mmr_offset(rst):
 148     case mmr_offset(read):
 149       dv_store_2 (dest, *valuep);
 150       break;
 151     case mmr_offset(pgctl):
 152     case mmr_offset(addr):
 153     case mmr_offset(cmd):
 154     case mmr_offset(data_wr):
 155     case mmr_offset(data_rd):
 156       /* These regs are write only.  */
 157     default:
 158       dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
 159       break;
 160     }
 161
 162   return nr_bytes;
 163 }
 164
 165 static unsigned
 166 bfin_nfc_dma_read_buffer (struct hw *me, void *dest, int space,
 167                           unsigned_word addr, unsigned nr_bytes)
 168 {
 169   HW_TRACE_DMA_READ ();
 170   return 0;
 171 }
 172
 173 static unsigned
 174 bfin_nfc_dma_write_buffer (struct hw *me, const void *source,
 175                            int space, unsigned_word addr,
 176                            unsigned nr_bytes,
 177                            int violate_read_only_section)
 178 {
 179   HW_TRACE_DMA_WRITE ();
 180   return nr_bytes;
 181 }
 182
 183 static const struct hw_port_descriptor bfin_nfc_ports[] =
 184 {
 185   { "stat", 0, 0, output_port, },
 186   { NULL, 0, 0, 0, },
 187 };
 188
 189 static void
 190 attach_bfin_nfc_regs (struct hw *me, struct bfin_nfc *nfc)
 191 {
 192   address_word attach_address;
 193   int attach_space;
 194   unsigned attach_size;
 195   reg_property_spec reg;
 196
 197   if (hw_find_property (me, "reg") == NULL)
 198     hw_abort (me, "Missing \"reg\" property");
 199
 200   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 201     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 202
 203   hw_unit_address_to_attach_address (hw_parent (me),
 204                                      &reg.address,
 205                                      &attach_space, &attach_address, me);
 206   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 207
 208   if (attach_size != BFIN_MMR_NFC_SIZE)
 209     hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_NFC_SIZE);
 210
 211   hw_attach_address (hw_parent (me),
 212                      0, attach_space, attach_address, attach_size, me);
 213
 214   nfc->base = attach_address;
 215 }
 216
 217 static void
 218 bfin_nfc_finish (struct hw *me)
 219 {
 220   struct bfin_nfc *nfc;
 221
 222   nfc = HW_ZALLOC (me, struct bfin_nfc);
 223
 224   set_hw_data (me, nfc);
 225   set_hw_io_read_buffer (me, bfin_nfc_io_read_buffer);
 226   set_hw_io_write_buffer (me, bfin_nfc_io_write_buffer);
 227   set_hw_dma_read_buffer (me, bfin_nfc_dma_read_buffer);
 228   set_hw_dma_write_buffer (me, bfin_nfc_dma_write_buffer);
 229   set_hw_ports (me, bfin_nfc_ports);
 230
 231   attach_bfin_nfc_regs (me, nfc);
 232
 233   /* Initialize the NFC.  */
 234   nfc->ctl     = 0x0200;
 235   nfc->stat    = 0x0011;
 236   nfc->irqstat = 0x0004;
 237   nfc->irqmask = 0x001F;
 238 }
 239
 240 const struct hw_descriptor dv_bfin_nfc_descriptor[] =
 241 {
 242   {"bfin_nfc", bfin_nfc_finish,},
 243   {NULL, NULL},
 244 };