sim/bfin/dv-bfin_gptimer.c

   1 /* Blackfin General Purpose Timers (GPtimer) 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_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   if (nr_bytes == 4)
  65     value = dv_load_4 (source);
  66   else
  67     value = dv_load_2 (source);
  68
  69   mmr_off = addr - gptimer->base;
  70   valuep = (void *)((unsigned long)gptimer + mmr_base() + mmr_off);
  71   value16p = valuep;
  72   value32p = valuep;
  73
  74   HW_TRACE_WRITE ();
  75
  76   switch (mmr_off)
  77     {
  78     case mmr_offset(config):
  79       dv_bfin_mmr_require_16 (me, addr, nr_bytes, true);
  80       *value16p = value;
  81       break;
  82     case mmr_offset(counter):
  83     case mmr_offset(period):
  84     case mmr_offset(width):
  85       dv_bfin_mmr_require_32 (me, addr, nr_bytes, true);
  86       *value32p = value;
  87       break;
  88     default:
  89       dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
  90       break;
  91     }
  92
  93   return nr_bytes;
  94 }
  95
  96 static unsigned
  97 bfin_gptimer_io_read_buffer (struct hw *me, void *dest, int space,
  98                              address_word addr, unsigned nr_bytes)
  99 {
 100   struct bfin_gptimer *gptimer = hw_data (me);
 101   bu32 mmr_off;
 102   bu16 *value16p;
 103   bu32 *value32p;
 104   void *valuep;
 105
 106   mmr_off = addr - gptimer->base;
 107   valuep = (void *)((unsigned long)gptimer + mmr_base() + mmr_off);
 108   value16p = valuep;
 109   value32p = valuep;
 110
 111   HW_TRACE_READ ();
 112
 113   switch (mmr_off)
 114     {
 115     case mmr_offset(config):
 116       dv_bfin_mmr_require_16 (me, addr, nr_bytes, false);
 117       dv_store_2 (dest, *value16p);
 118       break;
 119     case mmr_offset(counter):
 120     case mmr_offset(period):
 121     case mmr_offset(width):
 122       dv_bfin_mmr_require_32 (me, addr, nr_bytes, false);
 123       dv_store_4 (dest, *value32p);
 124       break;
 125     default:
 126       dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
 127       break;
 128     }
 129
 130   return nr_bytes;
 131 }
 132
 133 static const struct hw_port_descriptor bfin_gptimer_ports[] =
 134 {
 135   { "stat", 0, 0, output_port, },
 136   { NULL, 0, 0, 0, },
 137 };
 138
 139 static void
 140 attach_bfin_gptimer_regs (struct hw *me, struct bfin_gptimer *gptimer)
 141 {
 142   address_word attach_address;
 143   int attach_space;
 144   unsigned attach_size;
 145   reg_property_spec reg;
 146
 147   if (hw_find_property (me, "reg") == NULL)
 148     hw_abort (me, "Missing \"reg\" property");
 149
 150   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 151     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 152
 153   hw_unit_address_to_attach_address (hw_parent (me),
 154                                      &reg.address,
 155                                      &attach_space, &attach_address, me);
 156   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 157
 158   if (attach_size != BFIN_MMR_GPTIMER_SIZE)
 159     hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPTIMER_SIZE);
 160
 161   hw_attach_address (hw_parent (me),
 162                      0, attach_space, attach_address, attach_size, me);
 163
 164   gptimer->base = attach_address;
 165 }
 166
 167 static void
 168 bfin_gptimer_finish (struct hw *me)
 169 {
 170   struct bfin_gptimer *gptimer;
 171
 172   gptimer = HW_ZALLOC (me, struct bfin_gptimer);
 173
 174   set_hw_data (me, gptimer);
 175   set_hw_io_read_buffer (me, bfin_gptimer_io_read_buffer);
 176   set_hw_io_write_buffer (me, bfin_gptimer_io_write_buffer);
 177   set_hw_ports (me, bfin_gptimer_ports);
 178
 179   attach_bfin_gptimer_regs (me, gptimer);
 180 }
 181
 182 const struct hw_descriptor dv_bfin_gptimer_descriptor[] =
 183 {
 184   {"bfin_gptimer", bfin_gptimer_finish,},
 185   {NULL, NULL},
 186 };