1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/*
* Copyright (c) 2025 The FreeBSD Foundation
*
* SPDX-License-Identifier: BSD-2-Clause
*/
/*
* Reference: Intel 6300ESB Controller Hub Datasheet Section 16
*/
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <sys/watchdog.h>
#include <dev/pci/pcireg.h>
#include <dev/ichwd/ichwd.h>
#include <dev/ichwd/i6300esbwd.h>
#include <x86/pci_cfgreg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pci_private.h>
struct i6300esbwd_softc {
device_t dev;
int res_id;
struct resource *res;
eventhandler_tag ev_tag;
bool locked;
};
static const struct i6300esbwd_pci_id {
uint16_t id;
const char *name;
} i6300esbwd_pci_devices[] = {
{ DEVICEID_6300ESB_2, "6300ESB Watchdog Timer" },
};
static uint16_t __unused
i6300esbwd_cfg_read(struct i6300esbwd_softc *sc)
{
return (pci_read_config(sc->dev, WDT_CONFIG_REG, 2));
}
static void
i6300esbwd_cfg_write(struct i6300esbwd_softc *sc, uint16_t val)
{
pci_write_config(sc->dev, WDT_CONFIG_REG, val, 2);
}
static uint8_t
i6300esbwd_lock_read(struct i6300esbwd_softc *sc)
{
return (pci_read_config(sc->dev, WDT_LOCK_REG, 1));
}
static void
i6300esbwd_lock_write(struct i6300esbwd_softc *sc, uint8_t val)
{
pci_write_config(sc->dev, WDT_LOCK_REG, val, 1);
}
/*
* According to Intel 6300ESB I/O Controller Hub Datasheet 16.5.2,
* the resource should be unlocked before modifing any registers.
* The way to unlock is by write 0x80, 0x86 to the reload register.
*/
static void
i6300esbwd_unlock_res(struct i6300esbwd_softc *sc)
{
bus_write_2(sc->res, WDT_RELOAD_REG, WDT_UNLOCK_SEQ_1_VAL);
bus_write_2(sc->res, WDT_RELOAD_REG, WDT_UNLOCK_SEQ_2_VAL);
}
static int
i6300esbwd_sysctl_locked(SYSCTL_HANDLER_ARGS)
{
struct i6300esbwd_softc *sc = (struct i6300esbwd_softc *)arg1;
int error;
int result;
result = sc->locked;
error = sysctl_handle_int(oidp, &result, 0, req);
if (error || !req->newptr)
return (error);
if (result == 1 && !sc->locked) {
i6300esbwd_lock_write(sc, i6300esbwd_lock_read(sc) | WDT_LOCK);
sc->locked = true;
}
return (0);
}
static void
i6300esbwd_event(void *arg, unsigned int cmd, int *error)
{
struct i6300esbwd_softc *sc = arg;
uint32_t timeout;
uint16_t regval;
cmd &= WD_INTERVAL;
if (cmd != 0 &&
(cmd < WD_TO_1MS || (cmd - WD_TO_1MS) >= WDT_PRELOAD_BIT)) {
*error = EINVAL;
return;
}
timeout = 1 << (cmd - WD_TO_1MS);
/* reset the timer to prevent timeout a timeout is about to occur */
i6300esbwd_unlock_res(sc);
bus_write_2(sc->res, WDT_RELOAD_REG, WDT_RELOAD);
if (!cmd) {
/*
* when the lock is enabled, we are unable to overwrite LOCK
* register
*/
if (sc->locked)
*error = EPERM;
else
i6300esbwd_lock_write(sc,
i6300esbwd_lock_read(sc) & ~WDT_ENABLE);
return;
}
i6300esbwd_unlock_res(sc);
bus_write_4(sc->res, WDT_PRELOAD_1_REG, timeout);
i6300esbwd_unlock_res(sc);
bus_write_4(sc->res, WDT_PRELOAD_2_REG, timeout);
i6300esbwd_unlock_res(sc);
bus_write_2(sc->res, WDT_RELOAD_REG, WDT_RELOAD);
if (!sc->locked) {
i6300esbwd_lock_write(sc, WDT_ENABLE);
regval = i6300esbwd_lock_read(sc);
sc->locked = regval & WDT_LOCK;
}
}
static int
i6300esbwd_probe(device_t dev)
{
const struct i6300esbwd_pci_id *pci_id;
uint16_t pci_dev_id;
int err = ENXIO;
if (pci_get_vendor(dev) != VENDORID_INTEL)
goto end;
pci_dev_id = pci_get_device(dev);
for (pci_id = i6300esbwd_pci_devices;
pci_id < i6300esbwd_pci_devices + nitems(i6300esbwd_pci_devices);
++pci_id) {
if (pci_id->id == pci_dev_id) {
device_set_desc(dev, pci_id->name);
err = BUS_PROBE_DEFAULT;
break;
}
}
end:
return (err);
}
static int
i6300esbwd_attach(device_t dev)
{
struct i6300esbwd_softc *sc = device_get_softc(dev);
uint16_t regval;
sc->dev = dev;
sc->res_id = PCIR_BAR(0);
sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->res_id,
RF_ACTIVE);
if (sc->res == NULL) {
device_printf(dev, "unable to map memory region\n");
return (ENXIO);
}
i6300esbwd_cfg_write(sc, WDT_INT_TYPE_DISABLED_VAL);
regval = i6300esbwd_lock_read(sc);
if (regval & WDT_LOCK)
sc->locked = true;
else {
sc->locked = false;
i6300esbwd_lock_write(sc, WDT_TOUT_CNF_WT_MODE);
}
i6300esbwd_unlock_res(sc);
bus_write_2(sc->res, WDT_RELOAD_REG, WDT_RELOAD | WDT_TIMEOUT);
sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, i6300esbwd_event, sc,
0);
SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "locked",
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0,
i6300esbwd_sysctl_locked, "I",
"Lock the timer so that we cannot disable it");
return (0);
}
static int
i6300esbwd_detach(device_t dev)
{
struct i6300esbwd_softc *sc = device_get_softc(dev);
if (sc->ev_tag)
EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag);
if (sc->res)
bus_release_resource(dev, SYS_RES_MEMORY, sc->res_id, sc->res);
return (0);
}
static device_method_t i6300esbwd_methods[] = {
DEVMETHOD(device_probe, i6300esbwd_probe),
DEVMETHOD(device_attach, i6300esbwd_attach),
DEVMETHOD(device_detach, i6300esbwd_detach),
DEVMETHOD(device_shutdown, i6300esbwd_detach),
DEVMETHOD_END
};
static driver_t i6300esbwd_driver = {
"i6300esbwd",
i6300esbwd_methods,
sizeof(struct i6300esbwd_softc),
};
DRIVER_MODULE(i6300esbwd, pci, i6300esbwd_driver, NULL, NULL);
|
