FreeBSD/Linux Kernel Cross Reference
sys/dev/ichwd/ichwd.c
1 /*-
2 * Copyright (c) 2004 Texas A&M University
3 * All rights reserved.
4 *
5 * Developer: Wm. Daryl Hawkins
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * Intel ICH Watchdog Timer (WDT) driver
31 *
32 * Originally developed by Wm. Daryl Hawkins of Texas A&M
33 * Heavily modified by <des@FreeBSD.org>
34 *
35 * This is a tricky one. The ICH WDT can't be treated as a regular PCI
36 * device as it's actually an integrated function of the ICH LPC interface
37 * bridge. Detection is also awkward, because we can only infer the
38 * presence of the watchdog timer from the fact that the machine has an
39 * ICH chipset, or, on ACPI 2.x systems, by the presence of the 'WDDT'
40 * ACPI table (although this driver does not support the ACPI detection
41 * method).
42 *
43 * There is one slight problem on non-ACPI or ACPI 1.x systems: we have no
44 * way of knowing if the WDT is permanently disabled (either by the BIOS
45 * or in hardware).
46 *
47 * The WDT is programmed through I/O registers in the ACPI I/O space.
48 * Intel swears it's always at offset 0x60, so we use that.
49 *
50 * For details about the ICH WDT, see Intel Application Note AP-725
51 * (document no. 292273-001). The WDT is also described in the individual
52 * chipset datasheets, e.g. Intel82801EB ICH5 / 82801ER ICH5R Datasheet
53 * (document no. 252516-001) sections 9.10 and 9.11.
54 *
55 * ICH6/7/8 support by Takeharu KATO <takeharu1219@ybb.ne.jp>
56 */
57
58 #include <sys/cdefs.h>
59 __FBSDID("$FreeBSD$");
60
61 #include <sys/param.h>
62 #include <sys/kernel.h>
63 #include <sys/module.h>
64 #include <sys/systm.h>
65 #include <sys/bus.h>
66 #include <machine/bus.h>
67 #include <sys/rman.h>
68 #include <machine/resource.h>
69 #include <sys/watchdog.h>
70
71 #include <isa/isavar.h>
72 #include <dev/pci/pcivar.h>
73
74 #include <dev/ichwd/ichwd.h>
75
76 static struct ichwd_device ichwd_devices[] = {
77 { DEVICEID_82801AA, "Intel 82801AA watchdog timer", 1 },
78 { DEVICEID_82801AB, "Intel 82801AB watchdog timer", 1 },
79 { DEVICEID_82801BA, "Intel 82801BA watchdog timer", 2 },
80 { DEVICEID_82801BAM, "Intel 82801BAM watchdog timer", 2 },
81 { DEVICEID_82801CA, "Intel 82801CA watchdog timer", 3 },
82 { DEVICEID_82801CAM, "Intel 82801CAM watchdog timer", 3 },
83 { DEVICEID_82801DB, "Intel 82801DB watchdog timer", 4 },
84 { DEVICEID_82801DBM, "Intel 82801DBM watchdog timer", 4 },
85 { DEVICEID_82801E, "Intel 82801E watchdog timer", 5 },
86 { DEVICEID_82801EB, "Intel 82801EB watchdog timer", 5 },
87 { DEVICEID_82801EBR, "Intel 82801EB/ER watchdog timer", 5 },
88 { DEVICEID_6300ESB, "Intel 6300ESB watchdog timer", 5 },
89 { DEVICEID_82801FBR, "Intel 82801FB/FR watchdog timer", 6 },
90 { DEVICEID_ICH6M, "Intel ICH6M watchdog timer", 6 },
91 { DEVICEID_ICH6W, "Intel ICH6W watchdog timer", 6 },
92 { DEVICEID_ICH7, "Intel ICH7 watchdog timer", 7 },
93 { DEVICEID_ICH7DH, "Intel ICH7DH watchdog timer", 7 },
94 { DEVICEID_ICH7M, "Intel ICH7M watchdog timer", 7 },
95 { DEVICEID_ICH7MDH, "Intel ICH7MDH watchdog timer", 7 },
96 { DEVICEID_NM10, "Intel NM10 watchdog timer", 7 },
97 { DEVICEID_ICH8, "Intel ICH8 watchdog timer", 8 },
98 { DEVICEID_ICH8DH, "Intel ICH8DH watchdog timer", 8 },
99 { DEVICEID_ICH8DO, "Intel ICH8DO watchdog timer", 8 },
100 { DEVICEID_ICH8M, "Intel ICH8M watchdog timer", 8 },
101 { DEVICEID_ICH8ME, "Intel ICH8M-E watchdog timer", 8 },
102 { DEVICEID_63XXESB, "Intel 63XXESB watchdog timer", 8 },
103 { DEVICEID_ICH9, "Intel ICH9 watchdog timer", 9 },
104 { DEVICEID_ICH9DH, "Intel ICH9DH watchdog timer", 9 },
105 { DEVICEID_ICH9DO, "Intel ICH9DO watchdog timer", 9 },
106 { DEVICEID_ICH9M, "Intel ICH9M watchdog timer", 9 },
107 { DEVICEID_ICH9ME, "Intel ICH9M-E watchdog timer", 9 },
108 { DEVICEID_ICH9R, "Intel ICH9R watchdog timer", 9 },
109 { DEVICEID_ICH10, "Intel ICH10 watchdog timer", 10 },
110 { DEVICEID_ICH10D, "Intel ICH10D watchdog timer", 10 },
111 { DEVICEID_ICH10DO, "Intel ICH10DO watchdog timer", 10 },
112 { DEVICEID_ICH10R, "Intel ICH10R watchdog timer", 10 },
113 { DEVICEID_PCH, "Intel PCH watchdog timer", 10 },
114 { DEVICEID_PCHM, "Intel PCH watchdog timer", 10 },
115 { DEVICEID_P55, "Intel P55 watchdog timer", 10 },
116 { DEVICEID_PM55, "Intel PM55 watchdog timer", 10 },
117 { DEVICEID_H55, "Intel H55 watchdog timer", 10 },
118 { DEVICEID_QM57, "Intel QM57 watchdog timer", 10 },
119 { DEVICEID_H57, "Intel H57 watchdog timer", 10 },
120 { DEVICEID_HM55, "Intel HM55 watchdog timer", 10 },
121 { DEVICEID_Q57, "Intel Q57 watchdog timer", 10 },
122 { DEVICEID_HM57, "Intel HM57 watchdog timer", 10 },
123 { DEVICEID_PCHMSFF, "Intel PCHMSFF watchdog timer", 10 },
124 { DEVICEID_QS57, "Intel QS57 watchdog timer", 10 },
125 { DEVICEID_3400, "Intel 3400 watchdog timer", 10 },
126 { DEVICEID_3420, "Intel 3420 watchdog timer", 10 },
127 { DEVICEID_3450, "Intel 3450 watchdog timer", 10 },
128 { DEVICEID_CPT0, "Intel Cougar Point watchdog timer", 10 },
129 { DEVICEID_CPT1, "Intel Cougar Point watchdog timer", 10 },
130 { DEVICEID_CPT2, "Intel Cougar Point watchdog timer", 10 },
131 { DEVICEID_CPT3, "Intel Cougar Point watchdog timer", 10 },
132 { DEVICEID_CPT4, "Intel Cougar Point watchdog timer", 10 },
133 { DEVICEID_CPT5, "Intel Cougar Point watchdog timer", 10 },
134 { DEVICEID_CPT6, "Intel Cougar Point watchdog timer", 10 },
135 { DEVICEID_CPT7, "Intel Cougar Point watchdog timer", 10 },
136 { DEVICEID_CPT8, "Intel Cougar Point watchdog timer", 10 },
137 { DEVICEID_CPT9, "Intel Cougar Point watchdog timer", 10 },
138 { DEVICEID_CPT10, "Intel Cougar Point watchdog timer", 10 },
139 { DEVICEID_CPT11, "Intel Cougar Point watchdog timer", 10 },
140 { DEVICEID_CPT12, "Intel Cougar Point watchdog timer", 10 },
141 { DEVICEID_CPT13, "Intel Cougar Point watchdog timer", 10 },
142 { DEVICEID_CPT14, "Intel Cougar Point watchdog timer", 10 },
143 { DEVICEID_CPT15, "Intel Cougar Point watchdog timer", 10 },
144 { DEVICEID_CPT16, "Intel Cougar Point watchdog timer", 10 },
145 { DEVICEID_CPT17, "Intel Cougar Point watchdog timer", 10 },
146 { DEVICEID_CPT18, "Intel Cougar Point watchdog timer", 10 },
147 { DEVICEID_CPT19, "Intel Cougar Point watchdog timer", 10 },
148 { DEVICEID_CPT20, "Intel Cougar Point watchdog timer", 10 },
149 { DEVICEID_CPT21, "Intel Cougar Point watchdog timer", 10 },
150 { DEVICEID_CPT22, "Intel Cougar Point watchdog timer", 10 },
151 { DEVICEID_CPT23, "Intel Cougar Point watchdog timer", 10 },
152 { DEVICEID_CPT23, "Intel Cougar Point watchdog timer", 10 },
153 { DEVICEID_CPT25, "Intel Cougar Point watchdog timer", 10 },
154 { DEVICEID_CPT26, "Intel Cougar Point watchdog timer", 10 },
155 { DEVICEID_CPT27, "Intel Cougar Point watchdog timer", 10 },
156 { DEVICEID_CPT28, "Intel Cougar Point watchdog timer", 10 },
157 { DEVICEID_CPT29, "Intel Cougar Point watchdog timer", 10 },
158 { DEVICEID_CPT30, "Intel Cougar Point watchdog timer", 10 },
159 { DEVICEID_CPT31, "Intel Cougar Point watchdog timer", 10 },
160 { DEVICEID_PATSBURG_LPC1, "Intel Patsburg watchdog timer", 10 },
161 { DEVICEID_PATSBURG_LPC2, "Intel Patsburg watchdog timer", 10 },
162 { DEVICEID_PPT0, "Intel Panther Point watchdog timer", 10 },
163 { DEVICEID_PPT1, "Intel Panther Point watchdog timer", 10 },
164 { DEVICEID_PPT2, "Intel Panther Point watchdog timer", 10 },
165 { DEVICEID_PPT3, "Intel Panther Point watchdog timer", 10 },
166 { DEVICEID_PPT4, "Intel Panther Point watchdog timer", 10 },
167 { DEVICEID_PPT5, "Intel Panther Point watchdog timer", 10 },
168 { DEVICEID_PPT6, "Intel Panther Point watchdog timer", 10 },
169 { DEVICEID_PPT7, "Intel Panther Point watchdog timer", 10 },
170 { DEVICEID_PPT8, "Intel Panther Point watchdog timer", 10 },
171 { DEVICEID_PPT9, "Intel Panther Point watchdog timer", 10 },
172 { DEVICEID_PPT10, "Intel Panther Point watchdog timer", 10 },
173 { DEVICEID_PPT11, "Intel Panther Point watchdog timer", 10 },
174 { DEVICEID_PPT12, "Intel Panther Point watchdog timer", 10 },
175 { DEVICEID_PPT13, "Intel Panther Point watchdog timer", 10 },
176 { DEVICEID_PPT14, "Intel Panther Point watchdog timer", 10 },
177 { DEVICEID_PPT15, "Intel Panther Point watchdog timer", 10 },
178 { DEVICEID_PPT16, "Intel Panther Point watchdog timer", 10 },
179 { DEVICEID_PPT17, "Intel Panther Point watchdog timer", 10 },
180 { DEVICEID_PPT18, "Intel Panther Point watchdog timer", 10 },
181 { DEVICEID_PPT19, "Intel Panther Point watchdog timer", 10 },
182 { DEVICEID_PPT20, "Intel Panther Point watchdog timer", 10 },
183 { DEVICEID_PPT21, "Intel Panther Point watchdog timer", 10 },
184 { DEVICEID_PPT22, "Intel Panther Point watchdog timer", 10 },
185 { DEVICEID_PPT23, "Intel Panther Point watchdog timer", 10 },
186 { DEVICEID_PPT24, "Intel Panther Point watchdog timer", 10 },
187 { DEVICEID_PPT25, "Intel Panther Point watchdog timer", 10 },
188 { DEVICEID_PPT26, "Intel Panther Point watchdog timer", 10 },
189 { DEVICEID_PPT27, "Intel Panther Point watchdog timer", 10 },
190 { DEVICEID_PPT28, "Intel Panther Point watchdog timer", 10 },
191 { DEVICEID_PPT29, "Intel Panther Point watchdog timer", 10 },
192 { DEVICEID_PPT30, "Intel Panther Point watchdog timer", 10 },
193 { DEVICEID_PPT31, "Intel Panther Point watchdog timer", 10 },
194 { DEVICEID_WCPT2, "Intel Wildcat Point watchdog timer", 10 },
195 { DEVICEID_WCPT4, "Intel Wildcat Point watchdog timer", 10 },
196 { DEVICEID_WCPT6, "Intel Wildcat Point watchdog timer", 10 },
197 { DEVICEID_DH89XXCC_LPC, "Intel DH89xxCC watchdog timer", 10 },
198 { DEVICEID_COLETOCRK_LPC, "Intel Coleto Creek watchdog timer", 10 },
199 { 0, NULL, 0 },
200 };
201
202 static devclass_t ichwd_devclass;
203
204 #define ichwd_read_tco_1(sc, off) \
205 bus_read_1((sc)->tco_res, (off))
206 #define ichwd_read_tco_2(sc, off) \
207 bus_read_2((sc)->tco_res, (off))
208 #define ichwd_read_tco_4(sc, off) \
209 bus_read_4((sc)->tco_res, (off))
210 #define ichwd_read_smi_4(sc, off) \
211 bus_read_4((sc)->smi_res, (off))
212 #define ichwd_read_gcs_4(sc, off) \
213 bus_read_4((sc)->gcs_res, (off))
214
215 #define ichwd_write_tco_1(sc, off, val) \
216 bus_write_1((sc)->tco_res, (off), (val))
217 #define ichwd_write_tco_2(sc, off, val) \
218 bus_write_2((sc)->tco_res, (off), (val))
219 #define ichwd_write_tco_4(sc, off, val) \
220 bus_write_4((sc)->tco_res, (off), (val))
221 #define ichwd_write_smi_4(sc, off, val) \
222 bus_write_4((sc)->smi_res, (off), (val))
223 #define ichwd_write_gcs_4(sc, off, val) \
224 bus_write_4((sc)->gcs_res, (off), (val))
225
226 #define ichwd_verbose_printf(dev, ...) \
227 do { \
228 if (bootverbose) \
229 device_printf(dev, __VA_ARGS__);\
230 } while (0)
231
232 /*
233 * Disable the watchdog timeout SMI handler.
234 *
235 * Apparently, some BIOSes install handlers that reset or disable the
236 * watchdog timer instead of resetting the system, so we disable the SMI
237 * (by clearing the SMI_TCO_EN bit of the SMI_EN register) to prevent this
238 * from happening.
239 */
240 static __inline void
241 ichwd_smi_disable(struct ichwd_softc *sc)
242 {
243 ichwd_write_smi_4(sc, SMI_EN, ichwd_read_smi_4(sc, SMI_EN) & ~SMI_TCO_EN);
244 }
245
246 /*
247 * Enable the watchdog timeout SMI handler. See above for details.
248 */
249 static __inline void
250 ichwd_smi_enable(struct ichwd_softc *sc)
251 {
252 ichwd_write_smi_4(sc, SMI_EN, ichwd_read_smi_4(sc, SMI_EN) | SMI_TCO_EN);
253 }
254
255 /*
256 * Check if the watchdog SMI triggering is enabled.
257 */
258 static __inline int
259 ichwd_smi_is_enabled(struct ichwd_softc *sc)
260 {
261 return ((ichwd_read_smi_4(sc, SMI_EN) & SMI_TCO_EN) != 0);
262 }
263
264 /*
265 * Reset the watchdog status bits.
266 */
267 static __inline void
268 ichwd_sts_reset(struct ichwd_softc *sc)
269 {
270 /*
271 * The watchdog status bits are set to 1 by the hardware to
272 * indicate various conditions. They can be cleared by software
273 * by writing a 1, not a 0.
274 */
275 ichwd_write_tco_2(sc, TCO1_STS, TCO_TIMEOUT);
276 /*
277 * According to Intel's docs, clearing SECOND_TO_STS and BOOT_STS must
278 * be done in two separate operations.
279 */
280 ichwd_write_tco_2(sc, TCO2_STS, TCO_SECOND_TO_STS);
281 ichwd_write_tco_2(sc, TCO2_STS, TCO_BOOT_STS);
282 }
283
284 /*
285 * Enable the watchdog timer by clearing the TCO_TMR_HALT bit in the
286 * TCO1_CNT register. This is complicated by the need to preserve bit 9
287 * of that same register, and the requirement that all other bits must be
288 * written back as zero.
289 */
290 static __inline void
291 ichwd_tmr_enable(struct ichwd_softc *sc)
292 {
293 uint16_t cnt;
294
295 cnt = ichwd_read_tco_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE;
296 ichwd_write_tco_2(sc, TCO1_CNT, cnt & ~TCO_TMR_HALT);
297 sc->active = 1;
298 ichwd_verbose_printf(sc->device, "timer enabled\n");
299 }
300
301 /*
302 * Disable the watchdog timer. See above for details.
303 */
304 static __inline void
305 ichwd_tmr_disable(struct ichwd_softc *sc)
306 {
307 uint16_t cnt;
308
309 cnt = ichwd_read_tco_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE;
310 ichwd_write_tco_2(sc, TCO1_CNT, cnt | TCO_TMR_HALT);
311 sc->active = 0;
312 ichwd_verbose_printf(sc->device, "timer disabled\n");
313 }
314
315 /*
316 * Reload the watchdog timer: writing anything to any of the lower five
317 * bits of the TCO_RLD register reloads the timer from the last value
318 * written to TCO_TMR.
319 */
320 static __inline void
321 ichwd_tmr_reload(struct ichwd_softc *sc)
322 {
323 if (sc->ich_version <= 5)
324 ichwd_write_tco_1(sc, TCO_RLD, 1);
325 else
326 ichwd_write_tco_2(sc, TCO_RLD, 1);
327
328 ichwd_verbose_printf(sc->device, "timer reloaded\n");
329 }
330
331 /*
332 * Set the initial timeout value. Note that this must always be followed
333 * by a reload.
334 */
335 static __inline void
336 ichwd_tmr_set(struct ichwd_softc *sc, unsigned int timeout)
337 {
338
339 if (timeout < TCO_RLD_TMR_MIN)
340 timeout = TCO_RLD_TMR_MIN;
341
342 if (sc->ich_version <= 5) {
343 uint8_t tmr_val8 = ichwd_read_tco_1(sc, TCO_TMR1);
344
345 tmr_val8 &= (~TCO_RLD1_TMR_MAX & 0xff);
346 if (timeout > TCO_RLD1_TMR_MAX)
347 timeout = TCO_RLD1_TMR_MAX;
348 tmr_val8 |= timeout;
349 ichwd_write_tco_1(sc, TCO_TMR1, tmr_val8);
350 } else {
351 uint16_t tmr_val16 = ichwd_read_tco_2(sc, TCO_TMR2);
352
353 tmr_val16 &= (~TCO_RLD2_TMR_MAX & 0xffff);
354 if (timeout > TCO_RLD2_TMR_MAX)
355 timeout = TCO_RLD2_TMR_MAX;
356 tmr_val16 |= timeout;
357 ichwd_write_tco_2(sc, TCO_TMR2, tmr_val16);
358 }
359
360 sc->timeout = timeout;
361
362 ichwd_verbose_printf(sc->device, "timeout set to %u ticks\n", timeout);
363 }
364
365 static __inline int
366 ichwd_clear_noreboot(struct ichwd_softc *sc)
367 {
368 uint32_t status;
369 int rc = 0;
370
371 /* try to clear the NO_REBOOT bit */
372 if (sc->ich_version <= 5) {
373 status = pci_read_config(sc->ich, ICH_GEN_STA, 1);
374 status &= ~ICH_GEN_STA_NO_REBOOT;
375 pci_write_config(sc->ich, ICH_GEN_STA, status, 1);
376 status = pci_read_config(sc->ich, ICH_GEN_STA, 1);
377 if (status & ICH_GEN_STA_NO_REBOOT)
378 rc = EIO;
379 } else {
380 status = ichwd_read_gcs_4(sc, 0);
381 status &= ~ICH_GCS_NO_REBOOT;
382 ichwd_write_gcs_4(sc, 0, status);
383 status = ichwd_read_gcs_4(sc, 0);
384 if (status & ICH_GCS_NO_REBOOT)
385 rc = EIO;
386 }
387
388 if (rc)
389 device_printf(sc->device,
390 "ICH WDT present but disabled in BIOS or hardware\n");
391
392 return (rc);
393 }
394
395 /*
396 * Watchdog event handler - called by the framework to enable or disable
397 * the watchdog or change the initial timeout value.
398 */
399 static void
400 ichwd_event(void *arg, unsigned int cmd, int *error)
401 {
402 struct ichwd_softc *sc = arg;
403 unsigned int timeout;
404
405 /* convert from power-of-two-ns to WDT ticks */
406 cmd &= WD_INTERVAL;
407 timeout = ((uint64_t)1 << cmd) / ICHWD_TICK;
408 if (cmd) {
409 if (!sc->active)
410 ichwd_tmr_enable(sc);
411 if (timeout != sc->timeout)
412 ichwd_tmr_set(sc, timeout);
413 ichwd_tmr_reload(sc);
414 *error = 0;
415 } else {
416 if (sc->active)
417 ichwd_tmr_disable(sc);
418 }
419 }
420
421 static device_t
422 ichwd_find_ich_lpc_bridge(struct ichwd_device **id_p)
423 {
424 struct ichwd_device *id;
425 device_t ich = NULL;
426
427 /* look for an ICH LPC interface bridge */
428 for (id = ichwd_devices; id->desc != NULL; ++id)
429 if ((ich = pci_find_device(VENDORID_INTEL, id->device)) != NULL)
430 break;
431
432 if (ich == NULL)
433 return (NULL);
434
435 ichwd_verbose_printf(ich, "found ICH%d or equivalent chipset: %s\n",
436 id->version, id->desc);
437
438 if (id_p)
439 *id_p = id;
440
441 return (ich);
442 }
443
444 /*
445 * Look for an ICH LPC interface bridge. If one is found, register an
446 * ichwd device. There can be only one.
447 */
448 static void
449 ichwd_identify(driver_t *driver, device_t parent)
450 {
451 struct ichwd_device *id_p;
452 device_t ich = NULL;
453 device_t dev;
454 uint32_t rcba;
455 int rc;
456
457 ich = ichwd_find_ich_lpc_bridge(&id_p);
458 if (ich == NULL)
459 return;
460
461 /* good, add child to bus */
462 if ((dev = device_find_child(parent, driver->name, 0)) == NULL)
463 dev = BUS_ADD_CHILD(parent, 0, driver->name, 0);
464
465 if (dev == NULL)
466 return;
467
468 device_set_desc_copy(dev, id_p->desc);
469
470 if (id_p->version >= 6) {
471 /* get RCBA (root complex base address) */
472 rcba = pci_read_config(ich, ICH_RCBA, 4);
473 rc = bus_set_resource(ich, SYS_RES_MEMORY, 0,
474 (rcba & 0xffffc000) + ICH_GCS_OFFSET, ICH_GCS_SIZE);
475 if (rc)
476 ichwd_verbose_printf(dev,
477 "Can not set memory resource for RCBA\n");
478 }
479 }
480
481 static int
482 ichwd_probe(device_t dev)
483 {
484
485 /* Do not claim some ISA PnP device by accident. */
486 if (isa_get_logicalid(dev) != 0)
487 return (ENXIO);
488 return (0);
489 }
490
491 static int
492 ichwd_attach(device_t dev)
493 {
494 struct ichwd_softc *sc;
495 struct ichwd_device *id_p;
496 device_t ich;
497 unsigned int pmbase = 0;
498
499 sc = device_get_softc(dev);
500 sc->device = dev;
501
502 ich = ichwd_find_ich_lpc_bridge(&id_p);
503 if (ich == NULL) {
504 device_printf(sc->device, "Can not find ICH device.\n");
505 goto fail;
506 }
507 sc->ich = ich;
508 sc->ich_version = id_p->version;
509
510 /* get ACPI base address */
511 pmbase = pci_read_config(ich, ICH_PMBASE, 2) & ICH_PMBASE_MASK;
512 if (pmbase == 0) {
513 device_printf(dev, "ICH PMBASE register is empty\n");
514 goto fail;
515 }
516
517 /* allocate I/O register space */
518 sc->smi_rid = 0;
519 sc->smi_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->smi_rid,
520 pmbase + SMI_BASE, pmbase + SMI_BASE + SMI_LEN - 1, SMI_LEN,
521 RF_ACTIVE | RF_SHAREABLE);
522 if (sc->smi_res == NULL) {
523 device_printf(dev, "unable to reserve SMI registers\n");
524 goto fail;
525 }
526
527 sc->tco_rid = 1;
528 sc->tco_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->tco_rid,
529 pmbase + TCO_BASE, pmbase + TCO_BASE + TCO_LEN - 1, TCO_LEN,
530 RF_ACTIVE | RF_SHAREABLE);
531 if (sc->tco_res == NULL) {
532 device_printf(dev, "unable to reserve TCO registers\n");
533 goto fail;
534 }
535
536 sc->gcs_rid = 0;
537 if (sc->ich_version >= 6) {
538 sc->gcs_res = bus_alloc_resource_any(ich, SYS_RES_MEMORY,
539 &sc->gcs_rid, RF_ACTIVE|RF_SHAREABLE);
540 if (sc->gcs_res == NULL) {
541 device_printf(dev, "unable to reserve GCS registers\n");
542 goto fail;
543 }
544 }
545
546 if (ichwd_clear_noreboot(sc) != 0)
547 goto fail;
548
549 ichwd_verbose_printf(dev, "%s (ICH%d or equivalent)\n",
550 device_get_desc(dev), sc->ich_version);
551
552 /*
553 * Determine if we are coming up after a watchdog-induced reset. Some
554 * BIOSes may clear this bit at bootup, preventing us from reporting
555 * this case on such systems. We clear this bit in ichwd_sts_reset().
556 */
557 if ((ichwd_read_tco_2(sc, TCO2_STS) & TCO_SECOND_TO_STS) != 0)
558 device_printf(dev,
559 "resuming after hardware watchdog timeout\n");
560
561 /* reset the watchdog status registers */
562 ichwd_sts_reset(sc);
563
564 /* make sure the WDT starts out inactive */
565 ichwd_tmr_disable(sc);
566
567 /* register the watchdog event handler */
568 sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, ichwd_event, sc, 0);
569
570 /* disable the SMI handler */
571 sc->smi_enabled = ichwd_smi_is_enabled(sc);
572 ichwd_smi_disable(sc);
573
574 return (0);
575 fail:
576 sc = device_get_softc(dev);
577 if (sc->tco_res != NULL)
578 bus_release_resource(dev, SYS_RES_IOPORT,
579 sc->tco_rid, sc->tco_res);
580 if (sc->smi_res != NULL)
581 bus_release_resource(dev, SYS_RES_IOPORT,
582 sc->smi_rid, sc->smi_res);
583 if (sc->gcs_res != NULL)
584 bus_release_resource(ich, SYS_RES_MEMORY,
585 sc->gcs_rid, sc->gcs_res);
586
587 return (ENXIO);
588 }
589
590 static int
591 ichwd_detach(device_t dev)
592 {
593 struct ichwd_softc *sc;
594 device_t ich = NULL;
595
596 sc = device_get_softc(dev);
597
598 /* halt the watchdog timer */
599 if (sc->active)
600 ichwd_tmr_disable(sc);
601
602 /* enable the SMI handler */
603 if (sc->smi_enabled != 0)
604 ichwd_smi_enable(sc);
605
606 /* deregister event handler */
607 if (sc->ev_tag != NULL)
608 EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag);
609 sc->ev_tag = NULL;
610
611 /* reset the watchdog status registers */
612 ichwd_sts_reset(sc);
613
614 /* deallocate I/O register space */
615 bus_release_resource(dev, SYS_RES_IOPORT, sc->tco_rid, sc->tco_res);
616 bus_release_resource(dev, SYS_RES_IOPORT, sc->smi_rid, sc->smi_res);
617
618 /* deallocate memory resource */
619 ich = ichwd_find_ich_lpc_bridge(NULL);
620 if (sc->gcs_res && ich)
621 bus_release_resource(ich, SYS_RES_MEMORY, sc->gcs_rid, sc->gcs_res);
622
623 return (0);
624 }
625
626 static device_method_t ichwd_methods[] = {
627 DEVMETHOD(device_identify, ichwd_identify),
628 DEVMETHOD(device_probe, ichwd_probe),
629 DEVMETHOD(device_attach, ichwd_attach),
630 DEVMETHOD(device_detach, ichwd_detach),
631 DEVMETHOD(device_shutdown, ichwd_detach),
632 {0,0}
633 };
634
635 static driver_t ichwd_driver = {
636 "ichwd",
637 ichwd_methods,
638 sizeof(struct ichwd_softc),
639 };
640
641 DRIVER_MODULE(ichwd, isa, ichwd_driver, ichwd_devclass, NULL, NULL);
Cache object: 45fe6882a42c7c8d1542f43f43bf7770
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