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
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
|
/* $NetBSD: weasel_isa.c,v 1.6 2015/08/20 14:40:18 christos Exp $ */
/*-
* Copyright (c) 2000 Zembu Labs, Inc.
* All rights reserved.
*
* Author: Jason R. Thorpe <thorpej@zembu.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Zembu Labs, Inc.
* 4. Neither the name of Zembu Labs nor the names of its employees may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR-
* RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS-
* CLAIMED. IN NO EVENT SHALL ZEMBU LABS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Device driver for the Middle Digital, Inc. PC-Weasel serial
* console board.
*
* We're glued into the MDA display driver (`pcdisplay'), and
* handle things like the watchdog timer.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: weasel_isa.c,v 1.6 2015/08/20 14:40:18 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/wdog.h>
#include <sys/bus.h>
#include <dev/isa/weaselreg.h>
#include <dev/isa/weaselvar.h>
#include <dev/sysmon/sysmonvar.h>
#include "ioconf.h"
int weasel_isa_wdog_setmode(struct sysmon_wdog *);
int weasel_isa_wdog_tickle(struct sysmon_wdog *);
int weasel_isa_wdog_arm_disarm(struct weasel_handle *, u_int8_t);
int weasel_isa_wdog_query_state(struct weasel_handle *);
/* ARGSUSED */
void
pcweaselattach(int count)
{
/* Nothing to do; pseudo-device glue. */
}
void
weasel_isa_init(struct weasel_handle *wh)
{
struct weasel_config_block cfg;
int i, j;
u_int8_t *cp, sum;
const char *vers, *mode;
/*
* Write a NOP to the command register and see if it
* reverts back to READY within 1.5 seconds.
*/
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_MISC_COMMAND, OS_NOP);
for (i = 0; i < 1500; i++) {
delay(1000);
sum = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_MISC_COMMAND);
if (sum == OS_READY)
break;
}
if (sum != OS_READY) {
/* This is not a Weasel. */
return;
}
/*
* It can take a while for the config block to be copied
* into the offscreen area, as the Weasel may be busy
* sending data to the terminal. Wait up to 3 seconds,
* reading the block each time, and breaking out of the
* loop once the checksum passes.
*/
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_MISC_COMMAND,
OS_CONFIG_COPY);
/* ...one second to get it started... */
delay(1000 * 1000);
/* ...two seconds to let it finish... */
for (i = 0; i < 2000; i++) {
delay(1000);
bus_space_read_region_1(wh->wh_st, wh->wh_sh,
WEASEL_CONFIG_BLOCK, &cfg, sizeof(cfg));
/*
* Compute the checksum of the config block.
*/
for (cp = (u_int8_t *)&cfg, j = 0, sum = 1;
j < (sizeof(cfg) - 1); j++)
sum += cp[j];
if (sum == cfg.cksum)
break;
}
if (sum != cfg.cksum) {
/*
* Checksum doesn't match; either it's not a Weasel,
* or something is wrong with it.
*/
printf("%s: PC-Weasel config block checksum mismatch "
"0x%02x != 0x%02x\n", device_xname(wh->wh_parent),
sum, cfg.cksum);
return;
}
switch (cfg.cfg_version) {
case CFG_VERSION_1_0:
vers = "1.0";
switch (cfg.enable_duart_switching) {
case 0:
mode = "emulation";
break;
case 1:
mode = "autoswitch";
break;
default:
mode = "unknown";
}
break;
case CFG_VERSION_1_1:
vers = "1.1";
switch (cfg.enable_duart_switching) {
case 0:
mode = "emulation";
break;
case 1:
mode = "serial";
break;
case 2:
mode = "autoswitch";
break;
default:
mode = "unknown";
}
break;
default:
vers = mode = NULL;
}
printf("%s: PC-Weasel, ", device_xname(wh->wh_parent));
if (vers != NULL)
printf("version %s, %s mode", vers, mode);
else
printf("unknown version 0x%x", cfg.cfg_version);
printf("\n");
printf("%s: break passthrough %s", device_xname(wh->wh_parent),
cfg.break_passthru ? "enabled" : "disabled");
if (cfg.wdt_msec == 0) {
/*
* Old firmware -- these Weasels have
* a 3000ms watchdog period.
*/
cfg.wdt_msec = 3000;
}
if ((wh->wh_wdog_armed = weasel_isa_wdog_query_state(wh)) == -1)
wh->wh_wdog_armed = 0;
wh->wh_wdog_period = cfg.wdt_msec / 1000;
printf(", watchdog interval %d sec.\n", wh->wh_wdog_period);
/*
* Always register the Weasel watchdog timer in case user decides
* to set 'allow watchdog' to 'YES' after the machine has booted.
*/
wh->wh_smw.smw_name = "weasel";
wh->wh_smw.smw_cookie = wh;
wh->wh_smw.smw_setmode = weasel_isa_wdog_setmode;
wh->wh_smw.smw_tickle = weasel_isa_wdog_tickle;
wh->wh_smw.smw_period = wh->wh_wdog_period;
if (sysmon_wdog_register(&wh->wh_smw) != 0)
aprint_error_dev(wh->wh_parent, "unable to register PC-Weasel watchdog "
"with sysmon\n");
}
int
weasel_isa_wdog_setmode(struct sysmon_wdog *smw)
{
struct weasel_handle *wh = smw->smw_cookie;
int error = 0;
if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
error = weasel_isa_wdog_arm_disarm(wh, WDT_DISABLE);
} else {
if (smw->smw_period == WDOG_PERIOD_DEFAULT)
smw->smw_period = wh->wh_wdog_period;
else if (smw->smw_period != wh->wh_wdog_period) {
/* Can't change the period on the Weasel. */
return (EINVAL);
}
error = weasel_isa_wdog_arm_disarm(wh, WDT_ENABLE);
weasel_isa_wdog_tickle(smw);
}
return (error);
}
int
weasel_isa_wdog_tickle(struct sysmon_wdog *smw)
{
struct weasel_handle *wh = smw->smw_cookie;
u_int8_t reg;
int x;
int s;
int error = 0;
s = splhigh();
/*
* first we tickle the watchdog
*/
reg = bus_space_read_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_TICKLE);
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_TICKLE, ~reg);
/*
* then we check to make sure the weasel is still armed. If someone
* has rebooted the weasel for whatever reason (firmware update),
* then the watchdog timer would no longer be armed and we'd be
* servicing nothing. Let the user know that the machine is no
* longer being monitored by the weasel.
*/
if((x = weasel_isa_wdog_query_state(wh)) == -1)
error = EIO;
if (x == 1) {
error = 0;
} else {
aprint_error_dev(wh->wh_parent, "Watchdog timer disabled on PC/Weasel! Disarming wdog.\n");
wh->wh_wdog_armed = 0;
error = 1;
}
splx(s);
return (error);
}
int
weasel_isa_wdog_arm_disarm(struct weasel_handle *wh, u_int8_t mode)
{
u_int8_t reg;
int timeout;
int s, x;
int error = 0;
s = splhigh();
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE,
WDT_ATTENTION);
for (timeout = 5000; timeout; timeout--) {
delay(1500);
reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE);
if (reg == WDT_OK)
break;
}
if (timeout == 0) {
splx(s);
return(EIO);
}
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE, mode);
for (timeout = 500 ; timeout; timeout--) {
delay(1500);
reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE);
if (reg != mode)
break;
}
if (timeout == 0) {
splx(s);
return(EIO);
}
bus_space_write_1(wh->wh_st, wh->wh_sh, WEASEL_WDT_SEMAPHORE, ~reg);
for (timeout = 500; timeout; timeout--) {
delay(1500);
reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_WDT_SEMAPHORE);
if (reg == WDT_OK)
break;
}
/*
* Ensure that the Weasel thinks it's in the same mode we want it to
* be in. EIO if not.
*/
x = weasel_isa_wdog_query_state(wh);
switch (x) {
case -1:
error = EIO;
break;
case 0:
if (mode == WDT_DISABLE) {
wh->wh_wdog_armed = 0;
error = 0;
} else
error = EIO;
break;
case 1:
if (mode == WDT_ENABLE) {
wh->wh_wdog_armed = 1;
error = 0;
} else
error = EIO;
break;
}
splx(s);
return(error);
}
int
weasel_isa_wdog_query_state(struct weasel_handle *wh)
{
int timeout, reg;
bus_space_write_1(wh->wh_st, wh->wh_sh,
WEASEL_MISC_COMMAND, OS_WDT_QUERY);
for (timeout = 0; timeout < 1500; timeout++) {
delay(1000);
reg = bus_space_read_1(wh->wh_st, wh->wh_sh,
WEASEL_MISC_COMMAND);
if (reg == OS_READY)
break;
}
return(bus_space_read_1(wh->wh_st, wh->wh_sh, WEASEL_MISC_RESPONSE));
}
|