sim/bfin/dv-bfin_rtc.c

   1 /* Blackfin Real Time Clock (RTC) 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 <time.h>
  24 #include "sim-main.h"
  25 #include "dv-sockser.h"
  26 #include "devices.h"
  27 #include "dv-bfin_rtc.h"
  28
  29 /* XXX: This read-only stub setup is based on host system clock.  */
  30
  31 struct bfin_rtc
  32 {
  33   bu32 base;
  34   bu32 stat_shadow;
  35
  36   /* Order after here is important -- matches hardware MMR layout.  */
  37   bu32 stat;
  38   bu16 BFIN_MMR_16(ictl);
  39   bu16 BFIN_MMR_16(istat);
  40   bu16 BFIN_MMR_16(swcnt);
  41   bu32 alarm;
  42   bu16 BFIN_MMR_16(pren);
  43 };
  44 #define mmr_base()      offsetof(struct bfin_rtc, stat)
  45 #define mmr_offset(mmr) (offsetof(struct bfin_rtc, mmr) - mmr_base())
  46
  47 static const char * const mmr_names[] = {
  48   "RTC_STAT", "RTC_ICTL", "RTC_ISTAT", "RTC_SWCNT", "RTC_ALARM", "RTC_PREN",
  49 };
  50 #define mmr_name(off) mmr_names[(off) / 4]
  51
  52 static unsigned
  53 bfin_rtc_io_write_buffer (struct hw *me, const void *source,
  54                           int space, address_word addr, unsigned nr_bytes)
  55 {
  56   struct bfin_rtc *rtc = 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 - rtc->base;
  69   valuep = (void *)((unsigned long)rtc + mmr_base() + mmr_off);
  70   value16p = valuep;
  71   value32p = valuep;
  72
  73   HW_TRACE_WRITE ();
  74
  75   /* XXX: These probably need more work.  */
  76   switch (mmr_off)
  77     {
  78     case mmr_offset(stat):
  79       /* XXX: Ignore these since we are wired to host.  */
  80       break;
  81     case mmr_offset(istat):
  82       dv_w1c_2 (value16p, value, 1 << 14);
  83       break;
  84     case mmr_offset(alarm):
  85       break;
  86     case mmr_offset(ictl):
  87       /* XXX: This should schedule an event handler.  */
  88     case mmr_offset(swcnt):
  89     case mmr_offset(pren):
  90       break;
  91     }
  92
  93   return nr_bytes;
  94 }
  95
  96 static unsigned
  97 bfin_rtc_io_read_buffer (struct hw *me, void *dest,
  98                          int space, address_word addr, unsigned nr_bytes)
  99 {
 100   struct bfin_rtc *rtc = hw_data (me);
 101   bu32 mmr_off;
 102   bu16 *value16p;
 103   bu32 *value32p;
 104   void *valuep;
 105
 106   mmr_off = addr - rtc->base;
 107   valuep = (void *)((unsigned long)rtc + 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(stat):
 116       {
 117         time_t t = time (NULL);
 118         struct tm *tm = localtime (&t);
 119         bu32 value =
 120           (((tm->tm_year - 70) * 365 + tm->tm_yday) << 17) |
 121           (tm->tm_hour << 12) |
 122           (tm->tm_min << 6) |
 123           (tm->tm_sec << 0);
 124         dv_store_4 (dest, value);
 125         break;
 126       }
 127     case mmr_offset(alarm):
 128       dv_store_4 (dest, *value32p);
 129       break;
 130     case mmr_offset(istat):
 131     case mmr_offset(ictl):
 132     case mmr_offset(swcnt):
 133     case mmr_offset(pren):
 134       dv_store_2 (dest, *value16p);
 135       break;
 136     }
 137
 138   return nr_bytes;
 139 }
 140
 141 static const struct hw_port_descriptor bfin_rtc_ports[] = {
 142   { "rtc", 0, 0, output_port, },
 143   { NULL, 0, 0, 0, },
 144 };
 145
 146 static void
 147 attach_bfin_rtc_regs (struct hw *me, struct bfin_rtc *rtc)
 148 {
 149   address_word attach_address;
 150   int attach_space;
 151   unsigned attach_size;
 152   reg_property_spec reg;
 153
 154   if (hw_find_property (me, "reg") == NULL)
 155     hw_abort (me, "Missing \"reg\" property");
 156
 157   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 158     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 159
 160   hw_unit_address_to_attach_address (hw_parent (me),
 161                                      &reg.address,
 162                                      &attach_space, &attach_address, me);
 163   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 164
 165   if (attach_size != BFIN_MMR_RTC_SIZE)
 166     hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_RTC_SIZE);
 167
 168   hw_attach_address (hw_parent (me),
 169                      0, attach_space, attach_address, attach_size, me);
 170
 171   rtc->base = attach_address;
 172 }
 173
 174 static void
 175 bfin_rtc_finish (struct hw *me)
 176 {
 177   struct bfin_rtc *rtc;
 178
 179   rtc = HW_ZALLOC (me, struct bfin_rtc);
 180
 181   set_hw_data (me, rtc);
 182   set_hw_io_read_buffer (me, bfin_rtc_io_read_buffer);
 183   set_hw_io_write_buffer (me, bfin_rtc_io_write_buffer);
 184   set_hw_ports (me, bfin_rtc_ports);
 185
 186   attach_bfin_rtc_regs (me, rtc);
 187
 188   /* Initialize the RTC.  */
 189 }
 190
 191 const struct hw_descriptor dv_bfin_rtc_descriptor[] = {
 192   {"bfin_rtc", bfin_rtc_finish,},
 193   {NULL, NULL},
 194 };