1 /* Blackfin Watchdog (WDOG) model.
3 Copyright (C) 2010-2011 Free Software Foundation, Inc.
4 Contributed by Analog Devices, Inc.
6 This file is part of simulators.
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.
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.
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/>. */
24 #include "dv-sockser.h"
26 #include "dv-bfin_wdog.h"
28 /* XXX: Should we bother emulating the TX/RX FIFOs ? */
34 /* Order after here is important -- matches hardware MMR layout. */
35 bu16
BFIN_MMR_16(ctl
);
38 #define mmr_base() offsetof(struct bfin_wdog, ctl)
39 #define mmr_offset(mmr) (offsetof(struct bfin_wdog, mmr) - mmr_base())
41 static const char * const mmr_names
[] =
43 "WDOG_CTL", "WDOG_CNT", "WDOG_STAT",
45 #define mmr_name(off) mmr_names[(off) / 4]
48 bfin_wdog_enabled (struct bfin_wdog
*wdog
)
50 return ((wdog
->ctl
& WDEN
) != WDDIS
);
54 bfin_wdog_io_write_buffer (struct hw
*me
, const void *source
,
55 int space
, address_word addr
, unsigned nr_bytes
)
57 struct bfin_wdog
*wdog
= hw_data (me
);
65 value
= dv_load_4 (source
);
67 value
= dv_load_2 (source
);
69 mmr_off
= addr
- wdog
->base
;
70 valuep
= (void *)((unsigned long)wdog
+ mmr_base() + mmr_off
);
79 dv_w1c_2_partial (value16p
, value
, WDRO
);
80 /* XXX: Should enable an event here to handle timeouts. */
84 /* Writes are discarded when enabeld. */
85 if (!bfin_wdog_enabled (wdog
))
88 /* Writes to CNT preloads the STAT. */
89 wdog
->stat
= wdog
->cnt
;
93 case mmr_offset(stat
):
94 /* When enabled, writes to STAT reload the counter. */
95 if (bfin_wdog_enabled (wdog
))
96 wdog
->stat
= wdog
->cnt
;
97 /* XXX: When disabled, are writes just ignored ? */
105 bfin_wdog_io_read_buffer (struct hw
*me
, void *dest
,
106 int space
, address_word addr
, unsigned nr_bytes
)
108 struct bfin_wdog
*wdog
= hw_data (me
);
114 mmr_off
= addr
- wdog
->base
;
115 valuep
= (void *)((unsigned long)wdog
+ mmr_base() + mmr_off
);
123 case mmr_offset(ctl
):
124 dv_bfin_mmr_require_16 (me
, addr
, nr_bytes
, false);
125 dv_store_2 (dest
, *value16p
);
128 case mmr_offset(cnt
):
129 case mmr_offset(stat
):
130 dv_store_4 (dest
, *value32p
);
137 static const struct hw_port_descriptor bfin_wdog_ports
[] =
139 { "reset", WDEV_RESET
, 0, output_port
, },
140 { "nmi", WDEV_NMI
, 0, output_port
, },
141 { "gpi", WDEV_GPI
, 0, output_port
, },
146 bfin_wdog_port_event (struct hw
*me
, int my_port
, struct hw
*source
,
147 int source_port
, int level
)
149 struct bfin_wdog
*wdog
= hw_data (me
);
153 wdev
= (wdog
->ctl
& WDEV
);
154 if (wdev
!= WDEV_NONE
)
155 hw_port_event (me
, wdev
, 1);
159 attach_bfin_wdog_regs (struct hw
*me
, struct bfin_wdog
*wdog
)
161 address_word attach_address
;
163 unsigned attach_size
;
164 reg_property_spec reg
;
166 if (hw_find_property (me
, "reg") == NULL
)
167 hw_abort (me
, "Missing \"reg\" property");
169 if (!hw_find_reg_array_property (me
, "reg", 0, ®
))
170 hw_abort (me
, "\"reg\" property must contain three addr/size entries");
172 hw_unit_address_to_attach_address (hw_parent (me
),
174 &attach_space
, &attach_address
, me
);
175 hw_unit_size_to_attach_size (hw_parent (me
), ®
.size
, &attach_size
, me
);
177 if (attach_size
!= BFIN_MMR_WDOG_SIZE
)
178 hw_abort (me
, "\"reg\" size must be %#x", BFIN_MMR_WDOG_SIZE
);
180 hw_attach_address (hw_parent (me
),
181 0, attach_space
, attach_address
, attach_size
, me
);
183 wdog
->base
= attach_address
;
187 bfin_wdog_finish (struct hw
*me
)
189 struct bfin_wdog
*wdog
;
191 wdog
= HW_ZALLOC (me
, struct bfin_wdog
);
193 set_hw_data (me
, wdog
);
194 set_hw_io_read_buffer (me
, bfin_wdog_io_read_buffer
);
195 set_hw_io_write_buffer (me
, bfin_wdog_io_write_buffer
);
196 set_hw_ports (me
, bfin_wdog_ports
);
197 set_hw_port_event (me
, bfin_wdog_port_event
);
199 attach_bfin_wdog_regs (me
, wdog
);
201 /* Initialize the Watchdog. */
205 const struct hw_descriptor dv_bfin_wdog_descriptor
[] =
207 {"bfin_wdog", bfin_wdog_finish
,},