sim/bfin/dv-bfin_gptimer.c

   1 /* Blackfin General Purpose Timers (GPtimer) model
   2
   3    Copyright (C) 2010-2019 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_gptimer.h"
  26
  27 /* XXX: This is merely a stub.  */
  28
  29 struct bfin_gptimer
  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(config);
  42   bu32 counter, period, width;
  43 };
  44 #define mmr_base()      offsetof(struct bfin_gptimer, config)
  45 #define mmr_offset(mmr) (offsetof(struct bfin_gptimer, mmr) - mmr_base())
  46
  47 static const char * const mmr_names[] =
  48 {
  49   "TIMER_CONFIG", "TIMER_COUNTER", "TIMER_PERIOD", "TIMER_WIDTH",
  50 };
  51 #define mmr_name(off) mmr_names[(off) / 4]
  52
  53 static unsigned
  54 bfin_gptimer_io_write_buffer (struct hw *me, const void *source, int space,
  55                               address_word addr, unsigned nr_bytes)
  56 {
  57   struct bfin_gptimer *gptimer = hw_data (me);
  58   bu32 mmr_off;
  59   bu32 value;
  60   bu16 *value16p;
  61   bu32 *value32p;
  62   void *valuep;
  63
  64   /* Invalid access mode is higher priority than missing register.  */
  65   if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, true))
  66     return 0;
  67
  68   if (nr_bytes == 4)
  69     value = dv_load_4 (source);
  70   else
  71     value = dv_load_2 (source);
  72
  73   mmr_off = addr - gptimer->base;
  74   valuep = (void *)((unsigned long)gptimer + mmr_base() + mmr_off);
  75   value16p = valuep;
  76   value32p = valuep;
  77
  78   HW_TRACE_WRITE ();
  79
  80   switch (mmr_off)
  81     {
  82     case mmr_offset(config):
  83       if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true))
  84         return 0;
  85       *value16p = value;
  86       break;
  87     case mmr_offset(counter):
  88     case mmr_offset(period):
  89     case mmr_offset(width):
  90       if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, true))
  91         return 0;
  92       *value32p = value;
  93       break;
  94     default:
  95       dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
  96       return 0;
  97     }
  98
  99   return nr_bytes;
 100 }
 101
 102 static unsigned
 103 bfin_gptimer_io_read_buffer (struct hw *me, void *dest, int space,
 104                              address_word addr, unsigned nr_bytes)
 105 {
 106   struct bfin_gptimer *gptimer = hw_data (me);
 107   bu32 mmr_off;
 108   bu16 *value16p;
 109   bu32 *value32p;
 110   void *valuep;
 111
 112   /* Invalid access mode is higher priority than missing register.  */
 113   if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, false))
 114     return 0;
 115
 116   mmr_off = addr - gptimer->base;
 117   valuep = (void *)((unsigned long)gptimer + mmr_base() + mmr_off);
 118   value16p = valuep;
 119   value32p = valuep;
 120
 121   HW_TRACE_READ ();
 122
 123   switch (mmr_off)
 124     {
 125     case mmr_offset(config):
 126       if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false))
 127         return 0;
 128       dv_store_2 (dest, *value16p);
 129       break;
 130     case mmr_offset(counter):
 131     case mmr_offset(period):
 132     case mmr_offset(width):
 133       if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, false))
 134         return 0;
 135       dv_store_4 (dest, *value32p);
 136       break;
 137     default:
 138       dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
 139       return 0;
 140     }
 141
 142   return nr_bytes;
 143 }
 144
 145 static const struct hw_port_descriptor bfin_gptimer_ports[] =
 146 {
 147   { "stat", 0, 0, output_port, },
 148   { NULL, 0, 0, 0, },
 149 };
 150
 151 static void
 152 attach_bfin_gptimer_regs (struct hw *me, struct bfin_gptimer *gptimer)
 153 {
 154   address_word attach_address;
 155   int attach_space;
 156   unsigned attach_size;
 157   reg_property_spec reg;
 158
 159   if (hw_find_property (me, "reg") == NULL)
 160     hw_abort (me, "Missing \"reg\" property");
 161
 162   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 163     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 164
 165   hw_unit_address_to_attach_address (hw_parent (me),
 166                                      &reg.address,
 167                                      &attach_space, &attach_address, me);
 168   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 169
 170   if (attach_size != BFIN_MMR_GPTIMER_SIZE)
 171     hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPTIMER_SIZE);
 172
 173   hw_attach_address (hw_parent (me),
 174                      0, attach_space, attach_address, attach_size, me);
 175
 176   gptimer->base = attach_address;
 177 }
 178
 179 static void
 180 bfin_gptimer_finish (struct hw *me)
 181 {
 182   struct bfin_gptimer *gptimer;
 183
 184   gptimer = HW_ZALLOC (me, struct bfin_gptimer);
 185
 186   set_hw_data (me, gptimer);
 187   set_hw_io_read_buffer (me, bfin_gptimer_io_read_buffer);
 188   set_hw_io_write_buffer (me, bfin_gptimer_io_write_buffer);
 189   set_hw_ports (me, bfin_gptimer_ports);
 190
 191   attach_bfin_gptimer_regs (me, gptimer);
 192 }
 193
 194 const struct hw_descriptor dv_bfin_gptimer_descriptor[] =
 195 {
 196   {"bfin_gptimer", bfin_gptimer_finish,},
 197   {NULL, NULL},
 198 };