amdpm.c revision 1.39
1/*	$OpenBSD: amdpm.c,v 1.39 2023/02/04 19:19:37 cheloha Exp $	*/
2
3/*
4 * Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19/*-
20 * Copyright (c) 2002 The NetBSD Foundation, Inc.
21 * All rights reserved.
22 *
23 * This code is derived from software contributed to The NetBSD Foundation
24 * by Enami Tsugutomo.
25 *
26 * Redistribution and use in source and binary forms, with or without
27 * modification, are permitted provided that the following conditions
28 * are met:
29 * 1. Redistributions of source code must retain the above copyright
30 *    notice, this list of conditions and the following disclaimer.
31 * 2. Redistributions in binary form must reproduce the above copyright
32 *    notice, this list of conditions and the following disclaimer in the
33 *    documentation and/or other materials provided with the distribution.
34 *
35 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
36 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
37 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
38 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
39 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
40 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
41 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
42 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
43 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
44 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
45 * POSSIBILITY OF SUCH DAMAGE.
46 */
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/device.h>
51#include <sys/kernel.h>
52#include <sys/rwlock.h>
53#include <sys/timeout.h>
54#include <sys/timetc.h>
55
56#include <machine/bus.h>
57
58#include <dev/pci/pcivar.h>
59#include <dev/pci/pcireg.h>
60#include <dev/pci/pcidevs.h>
61
62#include <dev/i2c/i2cvar.h>
63
64#ifdef AMDPM_DEBUG
65#define DPRINTF(x...) printf(x)
66#else
67#define DPRINTF(x...)
68#endif
69
70#define AMDPM_SMBUS_DELAY	100
71#define AMDPM_SMBUS_TIMEOUT	1
72
73u_int amdpm_get_timecount(struct timecounter *tc);
74
75#ifndef AMDPM_FREQUENCY
76#define AMDPM_FREQUENCY 3579545
77#endif
78
79static struct timecounter amdpm_timecounter = {
80	.tc_get_timecount = amdpm_get_timecount,
81	.tc_counter_mask = 0xffffff,
82	.tc_frequency = AMDPM_FREQUENCY,
83	.tc_name = "AMDPM",
84	.tc_quality = 1000,
85	.tc_priv = NULL,
86	.tc_user = 0,
87};
88
89#define	AMDPM_CONFREG	0x40
90
91/* 0x40: General Configuration 1 Register */
92#define	AMDPM_RNGEN	0x00000080	/* random number generator enable */
93#define	AMDPM_STOPTMR	0x00000040	/* stop free-running timer */
94
95/* 0x41: General Configuration 2 Register */
96#define	AMDPM_PMIOEN	0x00008000	/* system management IO space enable */
97#define	AMDPM_TMRRST	0x00004000	/* reset free-running timer */
98#define	AMDPM_TMR32	0x00000800	/* extended (32 bit) timer enable */
99
100/* 0x42: SCI Interrupt Configuration Register */
101/* 0x43: Previous Power State Register */
102
103#define	AMDPM_PMPTR	0x58		/* PMxx System Management IO space
104					   Pointer */
105#define NFPM_PMPTR	0x14		/* nForce System Management IO space
106					   POinter */
107#define	AMDPM_PMBASE(x)	((x) & 0xff00)	/* PMxx base address */
108#define	AMDPM_PMSIZE	256		/* PMxx space size */
109
110/* Registers in PMxx space */
111#define	AMDPM_TMR	0x08		/* 24/32 bit timer register */
112
113#define	AMDPM_RNGDATA	0xf0		/* 32 bit random data register */
114#define	AMDPM_RNGSTAT	0xf4		/* RNG status register */
115#define	AMDPM_RNGDONE	0x00000001	/* Random number generation complete */
116
117#define AMDPM_SMB_REGS  0xe0		/* offset of SMB register space */
118#define AMDPM_SMB_SIZE  0xf		/* size of SMB register space */
119#define AMDPM_SMBSTAT	0x0		/* SMBus status */
120#define AMDPM_SMBSTAT_ABRT	(1 << 0)	/* transfer abort */
121#define AMDPM_SMBSTAT_COL	(1 << 1)	/* collision */
122#define AMDPM_SMBSTAT_PRERR	(1 << 2)	/* protocol error */
123#define AMDPM_SMBSTAT_HBSY	(1 << 3)	/* host controller busy */
124#define AMDPM_SMBSTAT_CYC	(1 << 4)	/* cycle complete */
125#define AMDPM_SMBSTAT_TO	(1 << 5)	/* timeout */
126#define AMDPM_SMBSTAT_SNP	(1 << 8)	/* snoop address match */
127#define AMDPM_SMBSTAT_SLV	(1 << 9)	/* slave address match */
128#define AMDPM_SMBSTAT_SMBA	(1 << 10)	/* SMBALERT# asserted */
129#define AMDPM_SMBSTAT_BSY	(1 << 11)	/* bus busy */
130#define AMDPM_SMBSTAT_BITS	"\020\001ABRT\002COL\003PRERR\004HBSY\005CYC\006TO\011SNP\012SLV\013SMBA\014BSY"
131#define AMDPM_SMBCTL	0x2		/* SMBus control */
132#define AMDPM_SMBCTL_CMD_QUICK	0		/* QUICK command */
133#define AMDPM_SMBCTL_CMD_BYTE	1		/* BYTE command */
134#define AMDPM_SMBCTL_CMD_BDATA	2		/* BYTE DATA command */
135#define AMDPM_SMBCTL_CMD_WDATA	3		/* WORD DATA command */
136#define AMDPM_SMBCTL_CMD_PCALL	4		/* PROCESS CALL command */
137#define AMDPM_SMBCTL_CMD_BLOCK	5		/* BLOCK command */
138#define AMDPM_SMBCTL_START	(1 << 3)	/* start transfer */
139#define AMDPM_SMBCTL_CYCEN	(1 << 4)	/* intr on cycle complete */
140#define AMDPM_SMBCTL_ABORT	(1 << 5)	/* abort transfer */
141#define AMDPM_SMBCTL_SNPEN	(1 << 8)	/* intr on snoop addr match */
142#define AMDPM_SMBCTL_SLVEN	(1 << 9)	/* intr on slave addr match */
143#define AMDPM_SMBCTL_SMBAEN	(1 << 10)	/* intr on SMBALERT# */
144#define AMDPM_SMBADDR	0x4		/* SMBus address */
145#define AMDPM_SMBADDR_READ	(1 << 0)	/* read direction */
146#define AMDPM_SMBADDR_ADDR(x)	(((x) & 0x7f) << 1) /* 7-bit address */
147#define AMDPM_SMBDATA	0x6		/* SMBus data */
148#define AMDPM_SMBCMD	0x8		/* SMBus command */
149
150
151struct amdpm_softc {
152	struct device sc_dev;
153
154	pci_chipset_tag_t sc_pc;
155	pcitag_t sc_tag;
156
157	bus_space_tag_t sc_iot;
158	bus_space_handle_t sc_ioh;		/* PMxx space */
159	bus_space_handle_t sc_i2c_ioh;		/* I2C space */
160	int sc_poll;
161
162	struct timeout sc_rnd_ch;
163
164	struct i2c_controller sc_i2c_tag;
165	struct rwlock sc_i2c_lock;
166	struct {
167		i2c_op_t op;
168		void *buf;
169		size_t len;
170		int flags;
171		volatile int error;
172	} sc_i2c_xfer;
173};
174
175int	amdpm_match(struct device *, void *, void *);
176void	amdpm_attach(struct device *, struct device *, void *);
177int	amdpm_activate(struct device *, int);
178void	amdpm_rnd_callout(void *);
179
180int	amdpm_i2c_acquire_bus(void *, int);
181void	amdpm_i2c_release_bus(void *, int);
182int	amdpm_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t,
183	    void *, size_t, int);
184
185int	amdpm_intr(void *);
186
187const struct cfattach amdpm_ca = {
188	sizeof(struct amdpm_softc), amdpm_match, amdpm_attach,
189	NULL, amdpm_activate
190};
191
192struct cfdriver amdpm_cd = {
193	NULL, "amdpm", DV_DULL
194};
195
196const struct pci_matchid amdpm_ids[] = {
197	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_PBC756_PMC },
198	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_766_PMC },
199	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_PBC768_PMC },
200	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_8111_PMC },
201	{ PCI_VENDOR_NVIDIA, PCI_PRODUCT_NVIDIA_NFORCE_SMB }
202};
203
204int
205amdpm_match(struct device *parent, void *match, void *aux)
206{
207	return (pci_matchbyid(aux, amdpm_ids,
208	    sizeof(amdpm_ids) / sizeof(amdpm_ids[0])));
209}
210
211void
212amdpm_attach(struct device *parent, struct device *self, void *aux)
213{
214	struct amdpm_softc *sc = (struct amdpm_softc *) self;
215	struct pci_attach_args *pa = aux;
216	struct i2cbus_attach_args iba;
217	pcireg_t cfg_reg, reg;
218	int i;
219
220	sc->sc_pc = pa->pa_pc;
221	sc->sc_tag = pa->pa_tag;
222	sc->sc_iot = pa->pa_iot;
223	sc->sc_poll = 1; /* XXX */
224
225
226	if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD)  {
227		cfg_reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
228		if ((cfg_reg & AMDPM_PMIOEN) == 0) {
229			printf(": PMxx space isn't enabled\n");
230			return;
231		}
232
233		reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR);
234		if (AMDPM_PMBASE(reg) == 0 ||
235		    bus_space_map(sc->sc_iot, AMDPM_PMBASE(reg), AMDPM_PMSIZE,
236		    0, &sc->sc_ioh)) {
237			printf("\n");
238			return;
239		}
240		if (bus_space_subregion(sc->sc_iot, sc->sc_ioh, AMDPM_SMB_REGS,
241		    AMDPM_SMB_SIZE, &sc->sc_i2c_ioh)) {
242			printf(": failed to map I2C subregion\n");
243			return;
244		}
245
246		if ((cfg_reg & AMDPM_TMRRST) == 0 &&
247		    (cfg_reg & AMDPM_STOPTMR) == 0 &&
248		    (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC768_PMC ||
249		    PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_8111_PMC)) {
250			printf(": %d-bit timer at %lluHz",
251			    (cfg_reg & AMDPM_TMR32) ? 32 : 24,
252			    amdpm_timecounter.tc_frequency);
253
254			amdpm_timecounter.tc_priv = sc;
255			if (cfg_reg & AMDPM_TMR32)
256				amdpm_timecounter.tc_counter_mask = 0xffffffffu;
257			tc_init(&amdpm_timecounter);
258		}
259		if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC768_PMC ||
260		    PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_8111_PMC) {
261			if ((cfg_reg & AMDPM_RNGEN) ==0) {
262				pci_conf_write(pa->pa_pc, pa->pa_tag,
263				    AMDPM_CONFREG, cfg_reg | AMDPM_RNGEN);
264				cfg_reg = pci_conf_read(pa->pa_pc, pa->pa_tag,
265				    AMDPM_CONFREG);
266			}
267			if (cfg_reg & AMDPM_RNGEN) {
268			/* Check to see if we can read data from the RNG. */
269				(void) bus_space_read_4(sc->sc_iot, sc->sc_ioh,
270				    AMDPM_RNGDATA);
271				for (i = 1000; i--; ) {
272					if (bus_space_read_1(sc->sc_iot,
273					    sc->sc_ioh, AMDPM_RNGSTAT) &
274					    AMDPM_RNGDONE)
275						break;
276					DELAY(10);
277				}
278				if (bus_space_read_1(sc->sc_iot, sc->sc_ioh,
279				    AMDPM_RNGSTAT) & AMDPM_RNGDONE) {
280					printf(": rng active");
281					timeout_set(&sc->sc_rnd_ch,
282					    amdpm_rnd_callout, sc);
283					amdpm_rnd_callout(sc);
284				}
285			}
286		}
287	} else if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NVIDIA) {
288		reg = pci_conf_read(pa->pa_pc, pa->pa_tag, NFPM_PMPTR);
289		if (AMDPM_PMBASE(reg) == 0 ||
290		    bus_space_map(sc->sc_iot, AMDPM_PMBASE(reg), AMDPM_SMB_SIZE, 0,
291		    &sc->sc_i2c_ioh)) {
292			printf(": failed to map I2C subregion\n");
293			return;
294		}
295	}
296	printf("\n");
297
298	/* Attach I2C bus */
299	rw_init(&sc->sc_i2c_lock, "iiclk");
300	sc->sc_i2c_tag.ic_cookie = sc;
301	sc->sc_i2c_tag.ic_acquire_bus = amdpm_i2c_acquire_bus;
302	sc->sc_i2c_tag.ic_release_bus = amdpm_i2c_release_bus;
303	sc->sc_i2c_tag.ic_exec = amdpm_i2c_exec;
304
305	bzero(&iba, sizeof(iba));
306	iba.iba_name = "iic";
307	iba.iba_tag = &sc->sc_i2c_tag;
308	config_found(self, &iba, iicbus_print);
309}
310
311int
312amdpm_activate(struct device *self, int act)
313{
314	struct amdpm_softc *sc = (struct amdpm_softc *)self;
315	int rv = 0;
316
317	switch (act) {
318	case DVACT_RESUME:
319		if (timeout_initialized(&sc->sc_rnd_ch)) {
320			pcireg_t cfg_reg;
321
322			/* Restart the AMD PBC768_PMC/8111_PMC RNG */
323			cfg_reg = pci_conf_read(sc->sc_pc, sc->sc_tag,
324			    AMDPM_CONFREG);
325			pci_conf_write(sc->sc_pc, sc->sc_tag,
326			    AMDPM_CONFREG, cfg_reg | AMDPM_RNGEN);
327
328		}
329		rv = config_activate_children(self, act);
330		break;
331	default:
332		rv = config_activate_children(self, act);
333		break;
334	}
335	return (rv);
336}
337
338void
339amdpm_rnd_callout(void *v)
340{
341	struct amdpm_softc *sc = v;
342	u_int32_t reg;
343
344	if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) &
345	    AMDPM_RNGDONE) != 0) {
346		reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGDATA);
347		enqueue_randomness(reg);
348	}
349	timeout_add(&sc->sc_rnd_ch, 1);
350}
351
352u_int
353amdpm_get_timecount(struct timecounter *tc)
354{
355	struct amdpm_softc *sc = tc->tc_priv;
356	u_int u2;
357#if 0
358	u_int u1, u3;
359#endif
360
361	u2 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_TMR);
362#if 0
363	u3 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_TMR);
364	do {
365		u1 = u2;
366		u2 = u3;
367		u3 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_TMR);
368	} while (u1 > u2 || u2 > u3);
369#endif
370	return (u2);
371}
372
373int
374amdpm_i2c_acquire_bus(void *cookie, int flags)
375{
376	struct amdpm_softc *sc = cookie;
377
378	if (cold || sc->sc_poll || (flags & I2C_F_POLL))
379		return (0);
380
381	return (rw_enter(&sc->sc_i2c_lock, RW_WRITE | RW_INTR));
382}
383
384void
385amdpm_i2c_release_bus(void *cookie, int flags)
386{
387	struct amdpm_softc *sc = cookie;
388
389	if (cold || sc->sc_poll || (flags & I2C_F_POLL))
390		return;
391
392	rw_exit(&sc->sc_i2c_lock);
393}
394
395int
396amdpm_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr,
397    const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags)
398{
399	struct amdpm_softc *sc = cookie;
400	u_int8_t *b;
401	u_int16_t st, ctl, data;
402	int retries;
403
404	DPRINTF("%s: exec: op %d, addr 0x%02x, cmdlen %d, len %d, "
405	    "flags 0x%02x\n", sc->sc_dev.dv_xname, op, addr, cmdlen,
406	    len, flags);
407
408	/* Wait for bus to be idle */
409	for (retries = 100; retries > 0; retries--) {
410		st = bus_space_read_2(sc->sc_iot, sc->sc_i2c_ioh, AMDPM_SMBSTAT);
411		if (!(st & AMDPM_SMBSTAT_BSY))
412			break;
413		DELAY(AMDPM_SMBUS_DELAY);
414	}
415	DPRINTF("%s: exec: st 0x%b\n", sc->sc_dev.dv_xname, st,
416	    AMDPM_SMBSTAT_BITS);
417	if (st & AMDPM_SMBSTAT_BSY)
418		return (1);
419
420	if (cold || sc->sc_poll)
421		flags |= I2C_F_POLL;
422
423	if (!I2C_OP_STOP_P(op) || cmdlen > 1 || len > 2)
424		return (1);
425
426	/* Setup transfer */
427	sc->sc_i2c_xfer.op = op;
428	sc->sc_i2c_xfer.buf = buf;
429	sc->sc_i2c_xfer.len = len;
430	sc->sc_i2c_xfer.flags = flags;
431	sc->sc_i2c_xfer.error = 0;
432
433	/* Set slave address and transfer direction */
434	bus_space_write_2(sc->sc_iot, sc->sc_i2c_ioh, AMDPM_SMBADDR,
435	    AMDPM_SMBADDR_ADDR(addr) |
436	    (I2C_OP_READ_P(op) ? AMDPM_SMBADDR_READ : 0));
437
438	b = (void *)cmdbuf;
439	if (cmdlen > 0)
440		/* Set command byte */
441		bus_space_write_1(sc->sc_iot, sc->sc_i2c_ioh, AMDPM_SMBCMD, b[0]);
442
443	if (I2C_OP_WRITE_P(op)) {
444		/* Write data */
445		data = 0;
446		b = buf;
447		if (len > 0)
448			data = b[0];
449		if (len > 1)
450			data |= ((u_int16_t)b[1] << 8);
451		if (len > 0)
452			bus_space_write_2(sc->sc_iot, sc->sc_i2c_ioh,
453			    AMDPM_SMBDATA, data);
454	}
455
456	/* Set SMBus command */
457	if (len == 0)
458		ctl = AMDPM_SMBCTL_CMD_BYTE;
459	else if (len == 1)
460		ctl = AMDPM_SMBCTL_CMD_BDATA;
461	else if (len == 2)
462		ctl = AMDPM_SMBCTL_CMD_WDATA;
463	else
464		panic("%s: unexpected len %zd", __func__, len);
465
466	if ((flags & I2C_F_POLL) == 0)
467		ctl |= AMDPM_SMBCTL_CYCEN;
468
469	/* Start transaction */
470	ctl |= AMDPM_SMBCTL_START;
471	bus_space_write_2(sc->sc_iot, sc->sc_i2c_ioh, AMDPM_SMBCTL, ctl);
472
473	if (flags & I2C_F_POLL) {
474		/* Poll for completion */
475		DELAY(AMDPM_SMBUS_DELAY);
476		for (retries = 1000; retries > 0; retries--) {
477			st = bus_space_read_2(sc->sc_iot, sc->sc_i2c_ioh,
478			    AMDPM_SMBSTAT);
479			if ((st & AMDPM_SMBSTAT_HBSY) == 0)
480				break;
481			DELAY(AMDPM_SMBUS_DELAY);
482		}
483		if (st & AMDPM_SMBSTAT_HBSY)
484			goto timeout;
485		amdpm_intr(sc);
486	} else {
487		/* Wait for interrupt */
488		if (tsleep_nsec(sc, PRIBIO, "amdpm",
489		    SEC_TO_NSEC(AMDPM_SMBUS_TIMEOUT)))
490			goto timeout;
491	}
492
493	if (sc->sc_i2c_xfer.error)
494		return (1);
495
496	return (0);
497
498timeout:
499	/*
500	 * Transfer timeout. Kill the transaction and clear status bits.
501	 */
502	printf("%s: exec: op %d, addr 0x%02x, cmdlen %zu, len %zu, "
503	    "flags 0x%02x: timeout, status 0x%b\n",
504	    sc->sc_dev.dv_xname, op, addr, cmdlen, len, flags,
505	    st, AMDPM_SMBSTAT_BITS);
506	bus_space_write_2(sc->sc_iot, sc->sc_i2c_ioh, AMDPM_SMBCTL,
507	    AMDPM_SMBCTL_ABORT);
508	DELAY(AMDPM_SMBUS_DELAY);
509	st = bus_space_read_2(sc->sc_iot, sc->sc_i2c_ioh, AMDPM_SMBSTAT);
510	if ((st & AMDPM_SMBSTAT_ABRT) == 0)
511		printf("%s: abort failed, status 0x%b\n",
512		    sc->sc_dev.dv_xname, st, AMDPM_SMBSTAT_BITS);
513	bus_space_write_2(sc->sc_iot, sc->sc_i2c_ioh, AMDPM_SMBSTAT, st);
514	return (1);
515}
516
517int
518amdpm_intr(void *arg)
519{
520	struct amdpm_softc *sc = arg;
521	u_int16_t st, data;
522	u_int8_t *b;
523	size_t len;
524
525	/* Read status */
526	st = bus_space_read_2(sc->sc_iot, sc->sc_i2c_ioh, AMDPM_SMBSTAT);
527	if ((st & AMDPM_SMBSTAT_HBSY) != 0 || (st & (AMDPM_SMBSTAT_ABRT |
528	    AMDPM_SMBSTAT_COL | AMDPM_SMBSTAT_PRERR | AMDPM_SMBSTAT_CYC |
529	    AMDPM_SMBSTAT_TO | AMDPM_SMBSTAT_SNP | AMDPM_SMBSTAT_SLV |
530	    AMDPM_SMBSTAT_SMBA)) == 0)
531		/* Interrupt was not for us */
532		return (0);
533
534	DPRINTF("%s: intr: st 0x%b\n", sc->sc_dev.dv_xname, st,
535	    AMDPM_SMBSTAT_BITS);
536
537	/* Clear status bits */
538	bus_space_write_2(sc->sc_iot, sc->sc_i2c_ioh, AMDPM_SMBSTAT, st);
539
540	/* Check for errors */
541	if (st & (AMDPM_SMBSTAT_COL | AMDPM_SMBSTAT_PRERR |
542	    AMDPM_SMBSTAT_TO)) {
543		sc->sc_i2c_xfer.error = 1;
544		goto done;
545	}
546
547	if (st & AMDPM_SMBSTAT_CYC) {
548		if (I2C_OP_WRITE_P(sc->sc_i2c_xfer.op))
549			goto done;
550
551		/* Read data */
552		b = sc->sc_i2c_xfer.buf;
553		len = sc->sc_i2c_xfer.len;
554		if (len > 0) {
555			data = bus_space_read_2(sc->sc_iot, sc->sc_i2c_ioh,
556			    AMDPM_SMBDATA);
557			b[0] = data & 0xff;
558		}
559		if (len > 1)
560			b[1] = (data >> 8) & 0xff;
561	}
562
563done:
564	if ((sc->sc_i2c_xfer.flags & I2C_F_POLL) == 0)
565		wakeup(sc);
566	return (1);
567}
568