xref: /netbsd-src/sys/dev/isa/itesio_isa.c (revision 404fbe5fb94ca1e054339640cabb2801ce52dd30) 
1 /*	$NetBSD: itesio_isa.c,v 1.17 2008/04/26 19:01:53 xtraeme Exp $ */
2 /*	Derived from $OpenBSD: it.c,v 1.19 2006/04/10 00:57:54 deraadt Exp $	*/
3 
4 /*
5  * Copyright (c) 2006-2007 Juan Romero Pardines <xtraeme@netbsd.org>
6  * Copyright (c) 2003 Julien Bordet <zejames@greyhats.org>
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITD TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITD TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 /*
31  * Driver for the iTE IT87xxF Super I/O. Currently supporting
32  * the Environmental Controller to monitor the sensors and the
33  * Watchdog Timer.
34  */
35 
36 #include <sys/cdefs.h>
37 __KERNEL_RCSID(0, "$NetBSD: itesio_isa.c,v 1.17 2008/04/26 19:01:53 xtraeme Exp $");
38 
39 #include <sys/param.h>
40 #include <sys/kernel.h>
41 #include <sys/device.h>
42 
43 #include <sys/bus.h>
44 
45 #include <dev/isa/isareg.h>
46 #include <dev/isa/isavar.h>
47 
48 #include <dev/sysmon/sysmonvar.h>
49 
50 #include <dev/isa/itesio_isavar.h>
51 
52 #define IT_VOLTSTART_IDX 	3 	/* voltage start index */
53 #define IT_FANSTART_IDX 	12 	/* fan start index */
54 
55 #if defined(ITESIO_DEBUG)
56 #define DPRINTF(x)		do { printf x; } while (0)
57 #else
58 #define DPRINTF(x)
59 #endif
60 
61 /*
62  * IT87-compatible chips can typically measure voltages up to 4.096 V.
63  * To measure higher voltages the input is attenuated with (external)
64  * resistors.  Negative voltages are measured using a reference
65  * voltage.  So we have to convert the sensor values back to real
66  * voltages by applying the appropriate resistor factor.
67  */
68 #define RFACT_NONE	10000
69 #define RFACT(x, y)	(RFACT_NONE * ((x) + (y)) / (y))
70 
71 /* autoconf(9) functions */
72 static int	itesio_isa_match(device_t, cfdata_t, void *);
73 static void	itesio_isa_attach(device_t, device_t, void *);
74 static int	itesio_isa_detach(device_t, int);
75 
76 CFATTACH_DECL_NEW(itesio, sizeof(struct itesio_softc),
77     itesio_isa_match, itesio_isa_attach, itesio_isa_detach, NULL);
78 
79 /* driver functions */
80 static uint8_t	itesio_ecreadreg(struct itesio_softc *, int);
81 static void	itesio_ecwritereg(struct itesio_softc *, int, int);
82 static uint8_t	itesio_readreg(bus_space_tag_t, bus_space_handle_t, int);
83 static void	itesio_writereg(bus_space_tag_t, bus_space_handle_t, int, int);
84 static void	itesio_enter(bus_space_tag_t, bus_space_handle_t);
85 static void	itesio_exit(bus_space_tag_t, bus_space_handle_t);
86 
87 /* sysmon_envsys(9) glue */
88 static void	itesio_setup_sensors(struct itesio_softc *);
89 static void	itesio_refresh_temp(struct itesio_softc *, envsys_data_t *);
90 static void	itesio_refresh_volts(struct itesio_softc *, envsys_data_t *);
91 static void	itesio_refresh_fans(struct itesio_softc *, envsys_data_t *);
92 static void	itesio_refresh(struct sysmon_envsys *, envsys_data_t *);
93 
94 /* sysmon_wdog glue */
95 static int	itesio_wdt_setmode(struct sysmon_wdog *);
96 static int 	itesio_wdt_tickle(struct sysmon_wdog *);
97 
98 /* rfact values for voltage sensors */
99 static const int itesio_vrfact[] = {
100 	RFACT_NONE,	/* VCORE_A	*/
101 	RFACT_NONE,	/* VCORE_B	*/
102 	RFACT_NONE,	/* +3.3V	*/
103 	RFACT(68, 100),	/* +5V 		*/
104 	RFACT(30, 10),	/* +12V 	*/
105 	RFACT(21, 10),	/* -5V 		*/
106 	RFACT(83, 20),	/* -12V 	*/
107 	RFACT(68, 100),	/* STANDBY	*/
108 	RFACT_NONE	/* VBAT		*/
109 };
110 
111 static int
112 itesio_isa_match(device_t parent, cfdata_t match, void *aux)
113 {
114 	struct isa_attach_args *ia = aux;
115 	bus_space_handle_t ioh;
116 	uint16_t cr;
117 
118 	/* Must supply an address */
119 	if (ia->ia_nio < 1)
120 		return 0;
121 
122 	if (ISA_DIRECT_CONFIG(ia))
123 		return 0;
124 
125 	if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
126 		return 0;
127 
128 	if (bus_space_map(ia->ia_iot, ia->ia_io[0].ir_addr, 2, 0, &ioh))
129 		return 0;
130 
131 	itesio_enter(ia->ia_iot, ioh);
132 	cr = (itesio_readreg(ia->ia_iot, ioh, ITESIO_CHIPID1) << 8);
133 	cr |= itesio_readreg(ia->ia_iot, ioh, ITESIO_CHIPID2);
134 	itesio_exit(ia->ia_iot, ioh);
135 	bus_space_unmap(ia->ia_iot, ioh, 2);
136 
137 	switch (cr) {
138 	case ITESIO_ID8705:
139 	case ITESIO_ID8712:
140 	case ITESIO_ID8716:
141 	case ITESIO_ID8718:
142 	case ITESIO_ID8726:
143 		ia->ia_nio = 1;
144 		ia->ia_io[0].ir_size = 2;
145 		ia->ia_niomem = 0;
146 		ia->ia_nirq = 0;
147 		ia->ia_ndrq = 0;
148 		return 1;
149 	default:
150 		return 0;
151 	}
152 }
153 
154 static void
155 itesio_isa_attach(device_t parent, device_t self, void *aux)
156 {
157 	struct itesio_softc *sc = device_private(self);
158 	struct isa_attach_args *ia = aux;
159 	int i;
160 	uint8_t cr;
161 
162 	sc->sc_iot = ia->ia_iot;
163 
164 	if (bus_space_map(sc->sc_iot, ia->ia_io[0].ir_addr, 2, 0,
165 			  &sc->sc_ioh)) {
166 		aprint_error(": can't map i/o space\n");
167 		return;
168 	}
169 
170 	aprint_naive("\n");
171 
172 	/*
173 	 * Enter to the Super I/O MB PNP mode.
174 	 */
175 	itesio_enter(sc->sc_iot, sc->sc_ioh);
176 	/*
177 	 * Get info from the Super I/O Global Configuration Registers:
178 	 * Chip IDs and Device Revision.
179 	 */
180 	sc->sc_chipid = (itesio_readreg(sc->sc_iot, sc->sc_ioh,
181 	    ITESIO_CHIPID1) << 8);
182 	sc->sc_chipid |= itesio_readreg(sc->sc_iot, sc->sc_ioh,
183 	    ITESIO_CHIPID2);
184 	sc->sc_devrev = (itesio_readreg(sc->sc_iot, sc->sc_ioh,
185 	    ITESIO_DEVREV) & 0x0f);
186 	/*
187 	 * Select the EC LDN to get the Base Address.
188 	 */
189 	itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_LDNSEL, ITESIO_EC_LDN);
190 	sc->sc_hwmon_baseaddr =
191 	    (itesio_readreg(sc->sc_iot, sc->sc_ioh, ITESIO_EC_MSB) << 8);
192 	sc->sc_hwmon_baseaddr |= itesio_readreg(sc->sc_iot, sc->sc_ioh,
193 	    ITESIO_EC_LSB);
194 	/*
195 	 * We are done, exit MB PNP mode.
196 	 */
197 	itesio_exit(sc->sc_iot, sc->sc_ioh);
198 
199 	aprint_normal(": iTE IT%4xF Super I/O (rev %d)\n",
200 	    sc->sc_chipid, sc->sc_devrev);
201 	aprint_normal_dev(self, "Hardware Monitor registers at 0x%x\n",
202 	    sc->sc_hwmon_baseaddr);
203 
204 	if (bus_space_map(sc->sc_ec_iot, sc->sc_hwmon_baseaddr, 8, 0,
205 	    &sc->sc_ec_ioh)) {
206 		aprint_error_dev(self, "cannot map hwmon i/o space\n");
207 		goto out2;
208 	}
209 
210 	sc->sc_hwmon_mapped = true;
211 
212 	/* Activate monitoring */
213 	cr = itesio_ecreadreg(sc, ITESIO_EC_CONFIG);
214 	SET(cr, 0x01);
215 	itesio_ecwritereg(sc, ITESIO_EC_CONFIG, cr);
216 
217 #ifdef notyet
218 	/* Enable beep alarms */
219 	cr = itesio_ecreadreg(sc, ITESIO_EC_BEEPEER);
220 	SET(cr, 0x02);	/* Voltage exceeds limit */
221 	SET(cr, 0x04);	/* Temperature exceeds limit */
222 	itesio_ecwritereg(sc, ITESIO_EC_BEEPEER, cr);
223 #endif
224 
225 	/*
226 	 * Initialize and attach sensors.
227 	 */
228 	itesio_setup_sensors(sc);
229 	sc->sc_sme = sysmon_envsys_create();
230 	for (i = 0; i < IT_NUM_SENSORS; i++) {
231 		if (sysmon_envsys_sensor_attach(sc->sc_sme,
232 						&sc->sc_sensor[i])) {
233 			sysmon_envsys_destroy(sc->sc_sme);
234 			goto out;
235 		}
236 	}
237 	/*
238 	 * Hook into the system monitor.
239 	 */
240 	sc->sc_sme->sme_name = device_xname(self);
241 	sc->sc_sme->sme_cookie = sc;
242 	sc->sc_sme->sme_refresh = itesio_refresh;
243 
244 	if ((i = sysmon_envsys_register(sc->sc_sme))) {
245 		aprint_error_dev(self,
246 		    "unable to register with sysmon (%d)\n", i);
247 		sysmon_envsys_destroy(sc->sc_sme);
248 		goto out;
249 	}
250 	sc->sc_hwmon_enabled = true;
251 
252 	if (!pmf_device_register(self, NULL, NULL))
253 		aprint_error_dev(self, "couldn't establish power handler\n");
254 
255 	/* The IT8705 doesn't support the WDT */
256 	if (sc->sc_chipid == ITESIO_ID8705)
257 		goto out2;
258 
259 	/*
260 	 * Initialize the watchdog timer.
261 	 */
262 	sc->sc_smw.smw_name = device_xname(self);
263 	sc->sc_smw.smw_cookie = sc;
264 	sc->sc_smw.smw_setmode = itesio_wdt_setmode;
265 	sc->sc_smw.smw_tickle = itesio_wdt_tickle;
266 	sc->sc_smw.smw_period = 60;
267 
268 	if (sysmon_wdog_register(&sc->sc_smw)) {
269 		aprint_error_dev(self, "unable to register watchdog timer\n");
270 		goto out2;
271 	}
272 	sc->sc_wdt_enabled = true;
273 	aprint_normal_dev(self, "Watchdog Timer present\n");
274 	return;
275 
276 out:
277 	bus_space_unmap(sc->sc_ec_iot, sc->sc_ec_ioh, 8);
278 out2:
279 	bus_space_unmap(sc->sc_iot, sc->sc_ioh, 2);
280 }
281 
282 static int
283 itesio_isa_detach(device_t self, int flags)
284 {
285 	struct itesio_softc *sc = device_private(self);
286 
287 	if (sc->sc_hwmon_enabled)
288 		sysmon_envsys_unregister(sc->sc_sme);
289 	if (sc->sc_hwmon_mapped)
290 		bus_space_unmap(sc->sc_ec_iot, sc->sc_ec_ioh, 8);
291 	if (sc->sc_wdt_enabled) {
292 		sysmon_wdog_unregister(&sc->sc_smw);
293 		bus_space_unmap(sc->sc_iot, sc->sc_ioh, 2);
294 	}
295 
296 	return 0;
297 }
298 
299 /*
300  * Functions to read/write to the Environmental Controller.
301  */
302 static uint8_t
303 itesio_ecreadreg(struct itesio_softc *sc, int reg)
304 {
305 	bus_space_write_1(sc->sc_ec_iot, sc->sc_ec_ioh, ITESIO_EC_ADDR, reg);
306 	return bus_space_read_1(sc->sc_ec_iot, sc->sc_ec_ioh, ITESIO_EC_DATA);
307 }
308 
309 static void
310 itesio_ecwritereg(struct itesio_softc *sc, int reg, int val)
311 {
312 	bus_space_write_1(sc->sc_ec_iot, sc->sc_ec_ioh, ITESIO_EC_ADDR, reg);
313 	bus_space_write_1(sc->sc_ec_iot, sc->sc_ec_ioh, ITESIO_EC_DATA, val);
314 }
315 
316 /*
317  * Functions to enter/exit/read/write to the Super I/O.
318  */
319 static uint8_t
320 itesio_readreg(bus_space_tag_t iot, bus_space_handle_t ioh, int reg)
321 {
322 	bus_space_write_1(iot, ioh, ITESIO_ADDR, reg);
323 	return bus_space_read_1(iot, ioh, ITESIO_DATA);
324 }
325 
326 static void
327 itesio_writereg(bus_space_tag_t iot, bus_space_handle_t ioh, int reg, int val)
328 {
329 	bus_space_write_1(iot, ioh, ITESIO_ADDR, reg);
330 	bus_space_write_1(iot, ioh, ITESIO_DATA, val);
331 }
332 
333 static void
334 itesio_enter(bus_space_tag_t iot, bus_space_handle_t ioh)
335 {
336 	bus_space_write_1(iot, ioh, ITESIO_ADDR, 0x87);
337 	bus_space_write_1(iot, ioh, ITESIO_ADDR, 0x01);
338 	bus_space_write_1(iot, ioh, ITESIO_ADDR, 0x55);
339 	bus_space_write_1(iot, ioh, ITESIO_ADDR, 0x55);
340 }
341 
342 static void
343 itesio_exit(bus_space_tag_t iot, bus_space_handle_t ioh)
344 {
345 	bus_space_write_1(iot, ioh, ITESIO_ADDR, 0x02);
346 	bus_space_write_1(iot, ioh, ITESIO_DATA, 0x02);
347 }
348 
349 
350 #define COPYDESCR(x, y)				\
351 	do {					\
352 		strlcpy((x), (y), sizeof(x));	\
353 	} while (0)
354 /*
355  * sysmon_envsys(9) glue.
356  */
357 static void
358 itesio_setup_sensors(struct itesio_softc *sc)
359 {
360 	int i;
361 
362 	/* temperatures */
363 	for (i = 0; i < IT_VOLTSTART_IDX; i++)
364 		sc->sc_sensor[i].units = ENVSYS_STEMP;
365 
366 	COPYDESCR(sc->sc_sensor[0].desc, "CPU Temp");
367 	COPYDESCR(sc->sc_sensor[1].desc, "System Temp");
368 	COPYDESCR(sc->sc_sensor[2].desc, "Aux Temp");
369 
370 	/* voltages */
371 	for (i = IT_VOLTSTART_IDX; i < IT_FANSTART_IDX; i++) {
372 		sc->sc_sensor[i].units = ENVSYS_SVOLTS_DC;
373 		sc->sc_sensor[i].flags = ENVSYS_FCHANGERFACT;
374 	}
375 
376 	COPYDESCR(sc->sc_sensor[3].desc, "VCORE_A");
377 	COPYDESCR(sc->sc_sensor[4].desc, "VCORE_B");
378 	COPYDESCR(sc->sc_sensor[5].desc, "+3.3V");
379 	COPYDESCR(sc->sc_sensor[6].desc, "+5V");
380 	COPYDESCR(sc->sc_sensor[7].desc, "+12V");
381 	COPYDESCR(sc->sc_sensor[8].desc, "-5V");
382 	COPYDESCR(sc->sc_sensor[9].desc, "-12V");
383 	COPYDESCR(sc->sc_sensor[10].desc, "STANDBY");
384 	COPYDESCR(sc->sc_sensor[11].desc, "VBAT");
385 
386 	/* fans */
387 	for (i = IT_FANSTART_IDX; i < IT_NUM_SENSORS; i++)
388 		sc->sc_sensor[i].units = ENVSYS_SFANRPM;
389 
390 	COPYDESCR(sc->sc_sensor[12].desc, "CPU Fan");
391 	COPYDESCR(sc->sc_sensor[13].desc, "System Fan");
392 	COPYDESCR(sc->sc_sensor[14].desc, "Aux Fan");
393 }
394 #undef COPYDESCR
395 
396 static void
397 itesio_refresh_temp(struct itesio_softc *sc, envsys_data_t *edata)
398 {
399 	int sdata;
400 
401 	sdata = itesio_ecreadreg(sc, ITESIO_EC_SENSORTEMPBASE + edata->sensor);
402 	/* sensor is not connected or reporting invalid data */
403 	if (sdata == 0 || sdata >= 0xfa) {
404 		edata->state = ENVSYS_SINVALID;
405 		return;
406 	}
407 
408 	DPRINTF(("%s: sdata[temp%d] 0x%x\n", __func__, edata->sensor, sdata));
409 	/* Convert temperature to uK */
410 	edata->value_cur = sdata * 1000000 + 273150000;
411 	edata->state = ENVSYS_SVALID;
412 }
413 
414 static void
415 itesio_refresh_volts(struct itesio_softc *sc, envsys_data_t *edata)
416 {
417 	uint8_t vbatcr = 0;
418 	int i, sdata;
419 
420 	i = edata->sensor - IT_VOLTSTART_IDX;
421 
422 	sdata = itesio_ecreadreg(sc, ITESIO_EC_SENSORVOLTBASE + i);
423 	/* not connected */
424 	if (sdata == 0 || sdata == 0xff) {
425 		edata->state = ENVSYS_SINVALID;
426 		return;
427 	}
428 
429 	/*
430 	 * update VBAT voltage reading every time we read it, to get
431 	 * latest value.
432 	 */
433 	if (i == 8) {
434 		vbatcr = itesio_ecreadreg(sc, ITESIO_EC_CONFIG);
435 		SET(vbatcr, ITESIO_EC_UPDATEVBAT);
436 		itesio_ecwritereg(sc, ITESIO_EC_CONFIG, vbatcr);
437 	}
438 
439 	DPRINTF(("%s: sdata[volt%d] 0x%x\n", __func__, i, sdata));
440 
441 	/* voltage returned as (mV << 4) */
442 	edata->value_cur = (sdata << 4);
443 	/* negative values */
444 	if (i == 5 || i == 6)
445 		edata->value_cur -= ITESIO_EC_VREF;
446 	/* rfact is (factor * 10^4) */
447 	edata->value_cur *= itesio_vrfact[i];
448 	if (edata->rfact)
449 		edata->value_cur += edata->rfact;
450 	/* division by 10 gets us back to uVDC */
451 	edata->value_cur /= 10;
452 	if (i == 5 || i == 6)
453 		edata->value_cur += ITESIO_EC_VREF * 1000;
454 
455 	edata->state = ENVSYS_SVALID;
456 }
457 
458 static void
459 itesio_refresh_fans(struct itesio_softc *sc, envsys_data_t *edata)
460 {
461 	uint8_t mode = 0;
462 	uint16_t sdata = 0;
463 	int i, divisor, odivisor, ndivisor;
464 
465 	i = edata->sensor - IT_FANSTART_IDX;
466 	divisor = odivisor = ndivisor = 0;
467 
468 	if (sc->sc_chipid == ITESIO_ID8705 || sc->sc_chipid == ITESIO_ID8712) {
469 		/*
470 		 * Use the Fan Tachometer Divisor Register for
471 		 * IT8705F and IT8712F.
472 		 */
473 		divisor = odivisor = ndivisor =
474 		    itesio_ecreadreg(sc, ITESIO_EC_FAN_TDR);
475 		sdata = itesio_ecreadreg(sc, ITESIO_EC_SENSORFANBASE + i);
476 		if (sdata == 0xff) {
477 			edata->state = ENVSYS_SINVALID;
478 			if (i == 2)
479 				ndivisor |= 0x40;
480 			else {
481 				ndivisor &= ~(7 << (i * 3));
482 				ndivisor |= ((divisor + 1) & 7) << (i * 3);
483 			}
484 		} else {
485 			if (i == 2)
486 				divisor = divisor & 1 ? 3 : 1;
487 
488 			if ((sdata << (divisor & 7)) == 0)
489 				edata->state = ENVSYS_SINVALID;
490 			else {
491 				edata->value_cur =
492 				    1350000 / (sdata << (divisor & 7));
493 				edata->state = ENVSYS_SVALID;
494 			}
495 		}
496 		DPRINTF(("%s: 8bit sdata[fan%d] 0x%x div: 0x%x\n", __func__,
497 		    i, sdata, divisor));
498 		if (ndivisor != odivisor)
499 			itesio_ecwritereg(sc, ITESIO_EC_FAN_TDR, ndivisor);
500 	} else {
501 		mode = itesio_ecreadreg(sc, ITESIO_EC_FAN16_CER);
502 		sdata = itesio_ecreadreg(sc, ITESIO_EC_SENSORFANBASE + i);
503 		if (mode & (1 << i))
504 			sdata += (itesio_ecreadreg(sc,
505 			    ITESIO_EC_SENSORFANEXTBASE + i) << 8);
506 		edata->state = ENVSYS_SVALID;
507 		if (sdata == 0 ||
508 		    sdata == ((mode & (1 << i)) ? 0xffff : 0xff))
509 			edata->state = ENVSYS_SINVALID;
510 		else {
511 			edata->value_cur = 1350000 / 2 / sdata;
512 			edata->state = ENVSYS_SVALID;
513 		}
514 		DPRINTF(("%s: 16bit sdata[fan%d] 0x%x\n", __func__, i, sdata));
515 	}
516 }
517 
518 static void
519 itesio_refresh(struct sysmon_envsys *sme, struct envsys_data *edata)
520 {
521 	struct itesio_softc *sc = sme->sme_cookie;
522 
523 	if (edata->sensor < IT_VOLTSTART_IDX)
524 		itesio_refresh_temp(sc, edata);
525 	else if (edata->sensor >= IT_VOLTSTART_IDX &&
526 	         edata->sensor < IT_FANSTART_IDX)
527 		itesio_refresh_volts(sc, edata);
528 	else
529 		itesio_refresh_fans(sc, edata);
530 }
531 
532 static int
533 itesio_wdt_setmode(struct sysmon_wdog *smw)
534 {
535 	struct itesio_softc *sc = smw->smw_cookie;
536 	int period = smw->smw_period;
537 
538 	/* Enter MB PNP mode and select the WDT LDN */
539 	itesio_enter(sc->sc_iot, sc->sc_ioh);
540 	itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_LDNSEL, ITESIO_WDT_LDN);
541 
542 	if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
543 		/* Disable the watchdog */
544 		itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_WDT_CTL, 0);
545 		itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_WDT_CNF, 0);
546 		itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_WDT_TMO_MSB, 0);
547 		itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_WDT_TMO_LSB, 0);
548 	} else {
549 		/* Enable the watchdog */
550 		if (period > ITESIO_WDT_MAXTIMO || period < 1)
551 			period = smw->smw_period = ITESIO_WDT_MAXTIMO;
552 
553 		period *= 2;
554 
555 		/* set the timeout and start the watchdog */
556 		itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_WDT_TMO_MSB,
557 		    period >> 8);
558 		itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_WDT_TMO_LSB,
559 		    period & 0xff);
560 		itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_WDT_CNF,
561 		    ITESIO_WDT_CNF_SECS | ITESIO_WDT_CNF_KRST |
562 		    ITESIO_WDT_CNF_PWROK);
563 	}
564 	/* we are done, exit MB PNP mode */
565 	itesio_exit(sc->sc_iot, sc->sc_ioh);
566 
567 	return 0;
568 }
569 
570 static int
571 itesio_wdt_tickle(struct sysmon_wdog *smw)
572 {
573 	struct itesio_softc *sc = smw->smw_cookie;
574 	int period = smw->smw_period * 2;
575 
576 	/* refresh timeout value and exit */
577 	itesio_enter(sc->sc_iot, sc->sc_ioh);
578 	itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_LDNSEL, ITESIO_WDT_LDN);
579 	itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_WDT_TMO_MSB,
580 	    period >> 8);
581 	itesio_writereg(sc->sc_iot, sc->sc_ioh, ITESIO_WDT_TMO_LSB,
582 	    period & 0xff);
583 	itesio_exit(sc->sc_iot, sc->sc_ioh);
584 
585 	return 0;
586 }
587