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
[] = {
42 "WDOG_CTL", "WDOG_CNT", "WDOG_STAT",
44 #define mmr_name(off) mmr_names[(off) / 4]
47 bfin_wdog_enabled (struct bfin_wdog
*wdog
)
49 return ((wdog
->ctl
& WDEN
) != WDDIS
);
53 bfin_wdog_io_write_buffer (struct hw
*me
, const void *source
,
54 int space
, address_word addr
, unsigned nr_bytes
)
56 struct bfin_wdog
*wdog
= hw_data (me
);
64 value
= dv_load_4 (source
);
66 value
= dv_load_2 (source
);
68 mmr_off
= addr
- wdog
->base
;
69 valuep
= (void *)((unsigned long)wdog
+ mmr_base() + mmr_off
);
78 dv_w1c_2_partial (value16p
, value
, WDRO
);
79 /* XXX: Should enable an event here to handle timeouts. */
83 /* Writes are discarded when enabeld. */
84 if (!bfin_wdog_enabled (wdog
))
87 /* Writes to CNT preloads the STAT. */
88 wdog
->stat
= wdog
->cnt
;
92 case mmr_offset(stat
):
93 /* When enabled, writes to STAT reload the counter. */
94 if (bfin_wdog_enabled (wdog
))
95 wdog
->stat
= wdog
->cnt
;
96 /* XXX: When disabled, are writes just ignored ? */
104 bfin_wdog_io_read_buffer (struct hw
*me
, void *dest
,
105 int space
, address_word addr
, unsigned nr_bytes
)
107 struct bfin_wdog
*wdog
= hw_data (me
);
113 mmr_off
= addr
- wdog
->base
;
114 valuep
= (void *)((unsigned long)wdog
+ mmr_base() + mmr_off
);
122 case mmr_offset(ctl
):
123 dv_bfin_mmr_require_16 (me
, addr
, nr_bytes
, false);
124 dv_store_2 (dest
, *value16p
);
127 case mmr_offset(cnt
):
128 case mmr_offset(stat
):
129 dv_store_4 (dest
, *value32p
);
136 static const struct hw_port_descriptor bfin_wdog_ports
[] = {
137 { "reset", WDEV_RESET
, 0, output_port
, },
138 { "nmi", WDEV_NMI
, 0, output_port
, },
139 { "gpi", WDEV_GPI
, 0, output_port
, },
144 bfin_wdog_port_event (struct hw
*me
, int my_port
, struct hw
*source
,
145 int source_port
, int level
)
147 struct bfin_wdog
*wdog
= hw_data (me
);
151 wdev
= (wdog
->ctl
& WDEV
);
152 if (wdev
!= WDEV_NONE
)
153 hw_port_event (me
, wdev
, 1);
157 attach_bfin_wdog_regs (struct hw
*me
, struct bfin_wdog
*wdog
)
159 address_word attach_address
;
161 unsigned attach_size
;
162 reg_property_spec reg
;
164 if (hw_find_property (me
, "reg") == NULL
)
165 hw_abort (me
, "Missing \"reg\" property");
167 if (!hw_find_reg_array_property (me
, "reg", 0, ®
))
168 hw_abort (me
, "\"reg\" property must contain three addr/size entries");
170 hw_unit_address_to_attach_address (hw_parent (me
),
172 &attach_space
, &attach_address
, me
);
173 hw_unit_size_to_attach_size (hw_parent (me
), ®
.size
, &attach_size
, me
);
175 if (attach_size
!= BFIN_MMR_WDOG_SIZE
)
176 hw_abort (me
, "\"reg\" size must be %#x", BFIN_MMR_WDOG_SIZE
);
178 hw_attach_address (hw_parent (me
),
179 0, attach_space
, attach_address
, attach_size
, me
);
181 wdog
->base
= attach_address
;
185 bfin_wdog_finish (struct hw
*me
)
187 struct bfin_wdog
*wdog
;
189 wdog
= HW_ZALLOC (me
, struct bfin_wdog
);
191 set_hw_data (me
, wdog
);
192 set_hw_io_read_buffer (me
, bfin_wdog_io_read_buffer
);
193 set_hw_io_write_buffer (me
, bfin_wdog_io_write_buffer
);
194 set_hw_ports (me
, bfin_wdog_ports
);
195 set_hw_port_event (me
, bfin_wdog_port_event
);
197 attach_bfin_wdog_regs (me
, wdog
);
199 /* Initialize the Watchdog. */
203 const struct hw_descriptor dv_bfin_wdog_descriptor
[] = {
204 {"bfin_wdog", bfin_wdog_finish
,},