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
31struct 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
47static 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
53static unsigned
54bfin_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  if (nr_bytes == 4)
65    value = dv_load_4 (source);
66  else
67    value = dv_load_2 (source);
68
69  mmr_off = addr - rtc->base;
70  valuep = (void *)((unsigned long)rtc + mmr_base() + mmr_off);
71  value16p = valuep;
72  value32p = valuep;
73
74  HW_TRACE_WRITE ();
75
76  /* XXX: These probably need more work.  */
77  switch (mmr_off)
78    {
79    case mmr_offset(stat):
80      /* XXX: Ignore these since we are wired to host.  */
81      break;
82    case mmr_offset(istat):
83      dv_w1c_2 (value16p, value, ~(1 << 14));
84      break;
85    case mmr_offset(alarm):
86      break;
87    case mmr_offset(ictl):
88      /* XXX: This should schedule an event handler.  */
89    case mmr_offset(swcnt):
90    case mmr_offset(pren):
91      break;
92    }
93
94  return nr_bytes;
95}
96
97static unsigned
98bfin_rtc_io_read_buffer (struct hw *me, void *dest,
99			 int space, address_word addr, unsigned nr_bytes)
100{
101  struct bfin_rtc *rtc = hw_data (me);
102  bu32 mmr_off;
103  bu16 *value16p;
104  bu32 *value32p;
105  void *valuep;
106
107  mmr_off = addr - rtc->base;
108  valuep = (void *)((unsigned long)rtc + mmr_base() + mmr_off);
109  value16p = valuep;
110  value32p = valuep;
111
112  HW_TRACE_READ ();
113
114  switch (mmr_off)
115    {
116    case mmr_offset(stat):
117      {
118	time_t t = time (NULL);
119	struct tm *tm = localtime (&t);
120	bu32 value =
121	  (((tm->tm_year - 70) * 365 + tm->tm_yday) << 17) |
122	  (tm->tm_hour << 12) |
123	  (tm->tm_min << 6) |
124	  (tm->tm_sec << 0);
125	dv_store_4 (dest, value);
126	break;
127      }
128    case mmr_offset(alarm):
129      dv_store_4 (dest, *value32p);
130      break;
131    case mmr_offset(istat):
132    case mmr_offset(ictl):
133    case mmr_offset(swcnt):
134    case mmr_offset(pren):
135      dv_store_2 (dest, *value16p);
136      break;
137    }
138
139  return nr_bytes;
140}
141
142static const struct hw_port_descriptor bfin_rtc_ports[] =
143{
144  { "rtc", 0, 0, output_port, },
145  { NULL, 0, 0, 0, },
146};
147
148static void
149attach_bfin_rtc_regs (struct hw *me, struct bfin_rtc *rtc)
150{
151  address_word attach_address;
152  int attach_space;
153  unsigned attach_size;
154  reg_property_spec reg;
155
156  if (hw_find_property (me, "reg") == NULL)
157    hw_abort (me, "Missing \"reg\" property");
158
159  if (!hw_find_reg_array_property (me, "reg", 0, &reg))
160    hw_abort (me, "\"reg\" property must contain three addr/size entries");
161
162  hw_unit_address_to_attach_address (hw_parent (me),
163				     &reg.address,
164				     &attach_space, &attach_address, me);
165  hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
166
167  if (attach_size != BFIN_MMR_RTC_SIZE)
168    hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_RTC_SIZE);
169
170  hw_attach_address (hw_parent (me),
171		     0, attach_space, attach_address, attach_size, me);
172
173  rtc->base = attach_address;
174}
175
176static void
177bfin_rtc_finish (struct hw *me)
178{
179  struct bfin_rtc *rtc;
180
181  rtc = HW_ZALLOC (me, struct bfin_rtc);
182
183  set_hw_data (me, rtc);
184  set_hw_io_read_buffer (me, bfin_rtc_io_read_buffer);
185  set_hw_io_write_buffer (me, bfin_rtc_io_write_buffer);
186  set_hw_ports (me, bfin_rtc_ports);
187
188  attach_bfin_rtc_regs (me, rtc);
189
190  /* Initialize the RTC.  */
191}
192
193const struct hw_descriptor dv_bfin_rtc_descriptor[] =
194{
195  {"bfin_rtc", bfin_rtc_finish,},
196  {NULL, NULL},
197};
198