sim/bfin/dv-bfin_rtc.c

   1 /* Blackfin Real Time Clock (RTC) model.
   2
   3    Copyright (C) 2010-2020 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 {
  49   "RTC_STAT", "RTC_ICTL", "RTC_ISTAT", "RTC_SWCNT", "RTC_ALARM", "RTC_PREN",
  50 };
  51 #define mmr_name(off) mmr_names[(off) / 4]
  52
  53 static unsigned
  54 bfin_rtc_io_write_buffer (struct hw *me, const void *source,
  55                           int space, address_word addr, unsigned nr_bytes)
  56 {
  57   struct bfin_rtc *rtc = 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 - rtc->base;
  74   valuep = (void *)((unsigned long)rtc + mmr_base() + mmr_off);
  75   value16p = valuep;
  76   value32p = valuep;
  77
  78   HW_TRACE_WRITE ();
  79
  80   /* XXX: These probably need more work.  */
  81   switch (mmr_off)
  82     {
  83     case mmr_offset(stat):
  84       /* XXX: Ignore these since we are wired to host.  */
  85       break;
  86     case mmr_offset(istat):
  87       dv_w1c_2 (value16p, value, ~(1 << 14));
  88       break;
  89     case mmr_offset(alarm):
  90       break;
  91     case mmr_offset(ictl):
  92       /* XXX: This should schedule an event handler.  */
  93     case mmr_offset(swcnt):
  94     case mmr_offset(pren):
  95       break;
  96     }
  97
  98   return nr_bytes;
  99 }
 100
 101 static unsigned
 102 bfin_rtc_io_read_buffer (struct hw *me, void *dest,
 103                          int space, address_word addr, unsigned nr_bytes)
 104 {
 105   struct bfin_rtc *rtc = hw_data (me);
 106   bu32 mmr_off;
 107   bu16 *value16p;
 108   bu32 *value32p;
 109   void *valuep;
 110
 111   /* Invalid access mode is higher priority than missing register.  */
 112   if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, false))
 113     return 0;
 114
 115   mmr_off = addr - rtc->base;
 116   valuep = (void *)((unsigned long)rtc + mmr_base() + mmr_off);
 117   value16p = valuep;
 118   value32p = valuep;
 119
 120   HW_TRACE_READ ();
 121
 122   switch (mmr_off)
 123     {
 124     case mmr_offset(stat):
 125       {
 126         time_t t = time (NULL);
 127         struct tm *tm = localtime (&t);
 128         bu32 value =
 129           (((tm->tm_year - 70) * 365 + tm->tm_yday) << 17) |
 130           (tm->tm_hour << 12) |
 131           (tm->tm_min << 6) |
 132           (tm->tm_sec << 0);
 133         dv_store_4 (dest, value);
 134         break;
 135       }
 136     case mmr_offset(alarm):
 137       dv_store_4 (dest, *value32p);
 138       break;
 139     case mmr_offset(istat):
 140     case mmr_offset(ictl):
 141     case mmr_offset(swcnt):
 142     case mmr_offset(pren):
 143       dv_store_2 (dest, *value16p);
 144       break;
 145     }
 146
 147   return nr_bytes;
 148 }
 149
 150 static const struct hw_port_descriptor bfin_rtc_ports[] =
 151 {
 152   { "rtc", 0, 0, output_port, },
 153   { NULL, 0, 0, 0, },
 154 };
 155
 156 static void
 157 attach_bfin_rtc_regs (struct hw *me, struct bfin_rtc *rtc)
 158 {
 159   address_word attach_address;
 160   int attach_space;
 161   unsigned attach_size;
 162   reg_property_spec reg;
 163
 164   if (hw_find_property (me, "reg") == NULL)
 165     hw_abort (me, "Missing \"reg\" property");
 166
 167   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 168     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 169
 170   hw_unit_address_to_attach_address (hw_parent (me),
 171                                      &reg.address,
 172                                      &attach_space, &attach_address, me);
 173   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 174
 175   if (attach_size != BFIN_MMR_RTC_SIZE)
 176     hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_RTC_SIZE);
 177
 178   hw_attach_address (hw_parent (me),
 179                      0, attach_space, attach_address, attach_size, me);
 180
 181   rtc->base = attach_address;
 182 }
 183
 184 static void
 185 bfin_rtc_finish (struct hw *me)
 186 {
 187   struct bfin_rtc *rtc;
 188
 189   rtc = HW_ZALLOC (me, struct bfin_rtc);
 190
 191   set_hw_data (me, rtc);
 192   set_hw_io_read_buffer (me, bfin_rtc_io_read_buffer);
 193   set_hw_io_write_buffer (me, bfin_rtc_io_write_buffer);
 194   set_hw_ports (me, bfin_rtc_ports);
 195
 196   attach_bfin_rtc_regs (me, rtc);
 197
 198   /* Initialize the RTC.  */
 199 }
 200
 201 const struct hw_descriptor dv_bfin_rtc_descriptor[] =
 202 {
 203   {"bfin_rtc", bfin_rtc_finish,},
 204   {NULL, NULL},
 205 };