sim/bfin/dv-bfin_gptimer.c

   1 /* Blackfin General Purpose Timers (GPtimer) model
   2
   3    Copyright (C) 2010-2021 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 /* This must come before any other includes.  */
  22 #include "defs.h"
  23
  24 #include "sim-main.h"
  25 #include "devices.h"
  26 #include "dv-bfin_gptimer.h"
  27
  28 /* XXX: This is merely a stub.  */
  29
  30 struct bfin_gptimer
  31 {
  32   /* This top portion matches common dv_bfin struct.  */
  33   bu32 base;
  34   struct hw *dma_master;
  35   bool acked;
  36
  37   struct hw_event *handler;
  38   char saved_byte;
  39   int saved_count;
  40
  41   /* Order after here is important -- matches hardware MMR layout.  */
  42   bu16 BFIN_MMR_16(config);
  43   bu32 counter, period, width;
  44 };
  45 #define mmr_base()      offsetof(struct bfin_gptimer, config)
  46 #define mmr_offset(mmr) (offsetof(struct bfin_gptimer, mmr) - mmr_base())
  47
  48 static const char * const mmr_names[] =
  49 {
  50   "TIMER_CONFIG", "TIMER_COUNTER", "TIMER_PERIOD", "TIMER_WIDTH",
  51 };
  52 #define mmr_name(off) mmr_names[(off) / 4]
  53
  54 static unsigned
  55 bfin_gptimer_io_write_buffer (struct hw *me, const void *source, int space,
  56                               address_word addr, unsigned nr_bytes)
  57 {
  58   struct bfin_gptimer *gptimer = hw_data (me);
  59   bu32 mmr_off;
  60   bu32 value;
  61   bu16 *value16p;
  62   bu32 *value32p;
  63   void *valuep;
  64
  65   /* Invalid access mode is higher priority than missing register.  */
  66   if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, true))
  67     return 0;
  68
  69   if (nr_bytes == 4)
  70     value = dv_load_4 (source);
  71   else
  72     value = dv_load_2 (source);
  73
  74   mmr_off = addr - gptimer->base;
  75   valuep = (void *)((unsigned long)gptimer + mmr_base() + mmr_off);
  76   value16p = valuep;
  77   value32p = valuep;
  78
  79   HW_TRACE_WRITE ();
  80
  81   switch (mmr_off)
  82     {
  83     case mmr_offset(config):
  84       if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true))
  85         return 0;
  86       *value16p = value;
  87       break;
  88     case mmr_offset(counter):
  89     case mmr_offset(period):
  90     case mmr_offset(width):
  91       if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, true))
  92         return 0;
  93       *value32p = value;
  94       break;
  95     default:
  96       dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
  97       return 0;
  98     }
  99
 100   return nr_bytes;
 101 }
 102
 103 static unsigned
 104 bfin_gptimer_io_read_buffer (struct hw *me, void *dest, int space,
 105                              address_word addr, unsigned nr_bytes)
 106 {
 107   struct bfin_gptimer *gptimer = hw_data (me);
 108   bu32 mmr_off;
 109   bu16 *value16p;
 110   bu32 *value32p;
 111   void *valuep;
 112
 113   /* Invalid access mode is higher priority than missing register.  */
 114   if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, false))
 115     return 0;
 116
 117   mmr_off = addr - gptimer->base;
 118   valuep = (void *)((unsigned long)gptimer + mmr_base() + mmr_off);
 119   value16p = valuep;
 120   value32p = valuep;
 121
 122   HW_TRACE_READ ();
 123
 124   switch (mmr_off)
 125     {
 126     case mmr_offset(config):
 127       if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false))
 128         return 0;
 129       dv_store_2 (dest, *value16p);
 130       break;
 131     case mmr_offset(counter):
 132     case mmr_offset(period):
 133     case mmr_offset(width):
 134       if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, false))
 135         return 0;
 136       dv_store_4 (dest, *value32p);
 137       break;
 138     default:
 139       dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
 140       return 0;
 141     }
 142
 143   return nr_bytes;
 144 }
 145
 146 static const struct hw_port_descriptor bfin_gptimer_ports[] =
 147 {
 148   { "stat", 0, 0, output_port, },
 149   { NULL, 0, 0, 0, },
 150 };
 151
 152 static void
 153 attach_bfin_gptimer_regs (struct hw *me, struct bfin_gptimer *gptimer)
 154 {
 155   address_word attach_address;
 156   int attach_space;
 157   unsigned attach_size;
 158   reg_property_spec reg;
 159
 160   if (hw_find_property (me, "reg") == NULL)
 161     hw_abort (me, "Missing \"reg\" property");
 162
 163   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 164     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 165
 166   hw_unit_address_to_attach_address (hw_parent (me),
 167                                      &reg.address,
 168                                      &attach_space, &attach_address, me);
 169   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 170
 171   if (attach_size != BFIN_MMR_GPTIMER_SIZE)
 172     hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPTIMER_SIZE);
 173
 174   hw_attach_address (hw_parent (me),
 175                      0, attach_space, attach_address, attach_size, me);
 176
 177   gptimer->base = attach_address;
 178 }
 179
 180 static void
 181 bfin_gptimer_finish (struct hw *me)
 182 {
 183   struct bfin_gptimer *gptimer;
 184
 185   gptimer = HW_ZALLOC (me, struct bfin_gptimer);
 186
 187   set_hw_data (me, gptimer);
 188   set_hw_io_read_buffer (me, bfin_gptimer_io_read_buffer);
 189   set_hw_io_write_buffer (me, bfin_gptimer_io_write_buffer);
 190   set_hw_ports (me, bfin_gptimer_ports);
 191
 192   attach_bfin_gptimer_regs (me, gptimer);
 193 }
 194
 195 const struct hw_descriptor dv_bfin_gptimer_descriptor[] =
 196 {
 197   {"bfin_gptimer", bfin_gptimer_finish,},
 198   {NULL, NULL},
 199 };