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
29struct 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
47static const char * const mmr_names[] =
48{
49  "TIMER_CONFIG", "TIMER_COUNTER", "TIMER_PERIOD", "TIMER_WIDTH",
50};
51#define mmr_name(off) mmr_names[(off) / 4]
52
53static unsigned
54bfin_gptimer_io_write_buffer (struct hw *me, const void *source, int space,
55			      address_word addr, unsigned nr_bytes)
56{
57  struct bfin_gptimer *gptimer = 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 - gptimer->base;
70  valuep = (void *)((unsigned long)gptimer + mmr_base() + mmr_off);
71  value16p = valuep;
72  value32p = valuep;
73
74  HW_TRACE_WRITE ();
75
76  switch (mmr_off)
77    {
78    case mmr_offset(config):
79      dv_bfin_mmr_require_16 (me, addr, nr_bytes, true);
80      *value16p = value;
81      break;
82    case mmr_offset(counter):
83    case mmr_offset(period):
84    case mmr_offset(width):
85      dv_bfin_mmr_require_32 (me, addr, nr_bytes, true);
86      *value32p = value;
87      break;
88    default:
89      dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
90      break;
91    }
92
93  return nr_bytes;
94}
95
96static unsigned
97bfin_gptimer_io_read_buffer (struct hw *me, void *dest, int space,
98			     address_word addr, unsigned nr_bytes)
99{
100  struct bfin_gptimer *gptimer = hw_data (me);
101  bu32 mmr_off;
102  bu16 *value16p;
103  bu32 *value32p;
104  void *valuep;
105
106  mmr_off = addr - gptimer->base;
107  valuep = (void *)((unsigned long)gptimer + 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(config):
116      dv_bfin_mmr_require_16 (me, addr, nr_bytes, false);
117      dv_store_2 (dest, *value16p);
118      break;
119    case mmr_offset(counter):
120    case mmr_offset(period):
121    case mmr_offset(width):
122      dv_bfin_mmr_require_32 (me, addr, nr_bytes, false);
123      dv_store_4 (dest, *value32p);
124      break;
125    default:
126      dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
127      break;
128    }
129
130  return nr_bytes;
131}
132
133static const struct hw_port_descriptor bfin_gptimer_ports[] =
134{
135  { "stat", 0, 0, output_port, },
136  { NULL, 0, 0, 0, },
137};
138
139static void
140attach_bfin_gptimer_regs (struct hw *me, struct bfin_gptimer *gptimer)
141{
142  address_word attach_address;
143  int attach_space;
144  unsigned attach_size;
145  reg_property_spec reg;
146
147  if (hw_find_property (me, "reg") == NULL)
148    hw_abort (me, "Missing \"reg\" property");
149
150  if (!hw_find_reg_array_property (me, "reg", 0, &reg))
151    hw_abort (me, "\"reg\" property must contain three addr/size entries");
152
153  hw_unit_address_to_attach_address (hw_parent (me),
154				     &reg.address,
155				     &attach_space, &attach_address, me);
156  hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
157
158  if (attach_size != BFIN_MMR_GPTIMER_SIZE)
159    hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPTIMER_SIZE);
160
161  hw_attach_address (hw_parent (me),
162		     0, attach_space, attach_address, attach_size, me);
163
164  gptimer->base = attach_address;
165}
166
167static void
168bfin_gptimer_finish (struct hw *me)
169{
170  struct bfin_gptimer *gptimer;
171
172  gptimer = HW_ZALLOC (me, struct bfin_gptimer);
173
174  set_hw_data (me, gptimer);
175  set_hw_io_read_buffer (me, bfin_gptimer_io_read_buffer);
176  set_hw_io_write_buffer (me, bfin_gptimer_io_write_buffer);
177  set_hw_ports (me, bfin_gptimer_ports);
178
179  attach_bfin_gptimer_regs (me, gptimer);
180}
181
182const struct hw_descriptor dv_bfin_gptimer_descriptor[] =
183{
184  {"bfin_gptimer", bfin_gptimer_finish,},
185  {NULL, NULL},
186};
187