1/* Blackfin Performance Monitor model.
2
3   Copyright (C) 2010-2023 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_pfmon.h"
27
28/* XXX: This is mostly a stub.  */
29
30struct bfin_pfmon
31{
32  bu32 base;
33
34  /* Order after here is important -- matches hardware MMR layout.  */
35  bu32 ctl;
36  bu32 _pad0[63];
37  bu32 cntr0, cntr1;
38};
39#define mmr_base()      offsetof(struct bfin_pfmon, ctl)
40#define mmr_offset(mmr) (offsetof(struct bfin_pfmon, mmr) - mmr_base())
41
42static const char * const mmr_names[] =
43{
44  "PFCTL", [mmr_offset (cntr0)] = "PFCNTR0", "PFCNTR1",
45};
46#define mmr_name(off) (mmr_names[(off) / 4] ? : "<INV>")
47
48static unsigned
49bfin_pfmon_io_write_buffer (struct hw *me, const void *source, int space,
50			    address_word addr, unsigned nr_bytes)
51{
52  struct bfin_pfmon *pfmon = hw_data (me);
53  bu32 mmr_off;
54  bu32 value;
55  bu32 *valuep;
56
57  /* Invalid access mode is higher priority than missing register.  */
58  if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, true))
59    return 0;
60
61  value = dv_load_4 (source);
62  mmr_off = addr - pfmon->base;
63  valuep = (void *)((uintptr_t)pfmon + mmr_base() + mmr_off);
64
65  HW_TRACE_WRITE ();
66
67  switch (mmr_off)
68    {
69    case mmr_offset(ctl):
70    case mmr_offset(cntr0):
71    case mmr_offset(cntr1):
72      *valuep = value;
73      break;
74    default:
75      dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
76      return 0;
77    }
78
79  return nr_bytes;
80}
81
82static unsigned
83bfin_pfmon_io_read_buffer (struct hw *me, void *dest, int space,
84			   address_word addr, unsigned nr_bytes)
85{
86  struct bfin_pfmon *pfmon = hw_data (me);
87  bu32 mmr_off;
88  bu32 value;
89  bu32 *valuep;
90
91  /* Invalid access mode is higher priority than missing register.  */
92  if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, false))
93    return 0;
94
95  mmr_off = addr - pfmon->base;
96  valuep = (void *)((uintptr_t)pfmon + mmr_base() + mmr_off);
97
98  HW_TRACE_READ ();
99
100  switch (mmr_off)
101    {
102    case mmr_offset(ctl):
103    case mmr_offset(cntr0):
104    case mmr_offset(cntr1):
105      value = *valuep;
106      break;
107    default:
108      dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
109      return 0;
110    }
111
112  dv_store_4 (dest, value);
113
114  return nr_bytes;
115}
116
117static void
118attach_bfin_pfmon_regs (struct hw *me, struct bfin_pfmon *pfmon)
119{
120  address_word attach_address;
121  int attach_space;
122  unsigned attach_size;
123  reg_property_spec reg;
124
125  if (hw_find_property (me, "reg") == NULL)
126    hw_abort (me, "Missing \"reg\" property");
127
128  if (!hw_find_reg_array_property (me, "reg", 0, &reg))
129    hw_abort (me, "\"reg\" property must contain three addr/size entries");
130
131  hw_unit_address_to_attach_address (hw_parent (me),
132				     &reg.address,
133				     &attach_space, &attach_address, me);
134  hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
135
136  if (attach_size != BFIN_COREMMR_PFMON_SIZE)
137    hw_abort (me, "\"reg\" size must be %#x", BFIN_COREMMR_PFMON_SIZE);
138
139  hw_attach_address (hw_parent (me),
140		     0, attach_space, attach_address, attach_size, me);
141
142  pfmon->base = attach_address;
143}
144
145static void
146bfin_pfmon_finish (struct hw *me)
147{
148  struct bfin_pfmon *pfmon;
149
150  pfmon = HW_ZALLOC (me, struct bfin_pfmon);
151
152  set_hw_data (me, pfmon);
153  set_hw_io_read_buffer (me, bfin_pfmon_io_read_buffer);
154  set_hw_io_write_buffer (me, bfin_pfmon_io_write_buffer);
155
156  attach_bfin_pfmon_regs (me, pfmon);
157}
158
159const struct hw_descriptor dv_bfin_pfmon_descriptor[] =
160{
161  {"bfin_pfmon", bfin_pfmon_finish,},
162  {NULL, NULL},
163};
164