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,},