sim/bfin/dv-bfin_gptimer.c

   1 /* Blackfin General Purpose Timers (GPtimer) model
   2
   3    Copyright (C) 2010-2011 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   "TIMER_CONFIG", "TIMER_COUNTER", "TIMER_PERIOD", "TIMER_WIDTH",
  49 };
  50 #define mmr_name(off) mmr_names[(off) / 4]
  51
  52 static unsigned
  53 bfin_gptimer_io_write_buffer (struct hw *me, const void *source, int space,
  54                               address_word addr, unsigned nr_bytes)
  55 {
  56   struct bfin_gptimer *gptimer = hw_data (me);
  57   bu32 mmr_off;
  58   bu32 value;
  59   bu16 *value16p;
  60   bu32 *value32p;
  61   void *valuep;
  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 - gptimer->base;
  69   valuep = (void *)((unsigned long)gptimer + 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(config):
  78       dv_bfin_mmr_require_16 (me, addr, nr_bytes, true);
  79       *value16p = value;
  80       break;
  81     case mmr_offset(counter):
  82     case mmr_offset(period):
  83     case mmr_offset(width):
  84       dv_bfin_mmr_require_32 (me, addr, nr_bytes, true);
  85       *value32p = value;
  86       break;
  87     default:
  88       dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
  89       break;
  90     }
  91
  92   return nr_bytes;
  93 }
  94
  95 static unsigned
  96 bfin_gptimer_io_read_buffer (struct hw *me, void *dest, int space,
  97                              address_word addr, unsigned nr_bytes)
  98 {
  99   struct bfin_gptimer *gptimer = hw_data (me);
 100   bu32 mmr_off;
 101   bu16 *value16p;
 102   bu32 *value32p;
 103   void *valuep;
 104
 105   mmr_off = addr - gptimer->base;
 106   valuep = (void *)((unsigned long)gptimer + mmr_base() + mmr_off);
 107   value16p = valuep;
 108   value32p = valuep;
 109
 110   HW_TRACE_READ ();
 111
 112   switch (mmr_off)
 113     {
 114     case mmr_offset(config):
 115       dv_bfin_mmr_require_16 (me, addr, nr_bytes, false);
 116       dv_store_2 (dest, *value16p);
 117       break;
 118     case mmr_offset(counter):
 119     case mmr_offset(period):
 120     case mmr_offset(width):
 121       dv_bfin_mmr_require_32 (me, addr, nr_bytes, false);
 122       dv_store_4 (dest, *value32p);
 123       break;
 124     default:
 125       dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
 126       break;
 127     }
 128
 129   return nr_bytes;
 130 }
 131
 132 static const struct hw_port_descriptor bfin_gptimer_ports[] = {
 133   { "stat", 0, 0, output_port, },
 134   { NULL, 0, 0, 0, },
 135 };
 136
 137 static void
 138 attach_bfin_gptimer_regs (struct hw *me, struct bfin_gptimer *gptimer)
 139 {
 140   address_word attach_address;
 141   int attach_space;
 142   unsigned attach_size;
 143   reg_property_spec reg;
 144
 145   if (hw_find_property (me, "reg") == NULL)
 146     hw_abort (me, "Missing \"reg\" property");
 147
 148   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 149     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 150
 151   hw_unit_address_to_attach_address (hw_parent (me),
 152                                      &reg.address,
 153                                      &attach_space, &attach_address, me);
 154   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 155
 156   if (attach_size != BFIN_MMR_GPTIMER_SIZE)
 157     hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPTIMER_SIZE);
 158
 159   hw_attach_address (hw_parent (me),
 160                      0, attach_space, attach_address, attach_size, me);
 161
 162   gptimer->base = attach_address;
 163 }
 164
 165 static void
 166 bfin_gptimer_finish (struct hw *me)
 167 {
 168   struct bfin_gptimer *gptimer;
 169
 170   gptimer = HW_ZALLOC (me, struct bfin_gptimer);
 171
 172   set_hw_data (me, gptimer);
 173   set_hw_io_read_buffer (me, bfin_gptimer_io_read_buffer);
 174   set_hw_io_write_buffer (me, bfin_gptimer_io_write_buffer);
 175   set_hw_ports (me, bfin_gptimer_ports);
 176
 177   attach_bfin_gptimer_regs (me, gptimer);
 178 }
 179
 180 const struct hw_descriptor dv_bfin_gptimer_descriptor[] = {
 181   {"bfin_gptimer", bfin_gptimer_finish,},
 182   {NULL, NULL},
 183 };