aml_common.c revision 1.2 
1/*	$NetBSD: aml_common.c,v 1.2 2009/01/18 09:46:59 lukem Exp $	*/
2
3/*-
4 * Copyright (c) 1999 Takanori Watanabe
5 * Copyright (c) 1999, 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	Id: aml_common.c,v 1.9 2000/08/09 14:47:43 iwasaki Exp
30 *	$FreeBSD: src/usr.sbin/acpi/amldb/aml/aml_common.c,v 1.6 2000/11/09 06:24:45 iwasaki Exp $
31 */
32#include <sys/cdefs.h>
33__RCSID("$NetBSD: aml_common.c,v 1.2 2009/01/18 09:46:59 lukem Exp $");
34
35#include <sys/param.h>
36
37#ifndef _KERNEL
38#include <assert.h>
39#include <err.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <unistd.h>
44#else /* _KERNEL */
45#include "opt_acpi.h"
46#include <sys/kernel.h>
47#include <sys/sysctl.h>
48#include <sys/systm.h>
49#include <sys/bus.h>
50#include <machine/bus.h>
51#include <dev/acpi/acpireg.h>
52#include <dev/acpi/acpivar.h>
53#ifndef ACPI_NO_OSDFUNC_INLINE
54#include <machine/acpica_osd.h>
55#endif /* !ACPI_NO_OSDFUNC_INLINE */
56#endif /* !_KERNEL */
57
58#include <acpi_common.h>
59#include <aml/aml_common.h>
60#include <aml/aml_env.h>
61#include <aml/aml_evalobj.h>
62#include <aml/aml_name.h>
63#include <aml/aml_obj.h>
64#include <aml/aml_parse.h>
65#include <aml/aml_status.h>
66#include <aml/aml_store.h>
67
68/* for debugging */
69#ifdef AML_DEBUG
70int	aml_debug = 1;
71#else	/* !AML_DEBUG */
72int	aml_debug = 0;
73#endif	/* AML_DEBUG */
74#ifdef _KERNEL
75SYSCTL_INT(_debug, OID_AUTO, aml_debug, CTLFLAG_RW, &aml_debug, 1, "");
76#endif /* _KERNEL */
77
78static void	 aml_print_nameseg(u_int8_t *dp);
79
80static void
81aml_print_nameseg(u_int8_t *dp)
82{
83
84	if (dp[3] != '_') {
85		AML_DEBUGPRINT("%c%c%c%c", dp[0], dp[1], dp[2], dp[3]);
86	} else if (dp[2] != '_') {
87		AML_DEBUGPRINT("%c%c%c_", dp[0], dp[1], dp[2]);
88	} else if (dp[1] != '_') {
89		AML_DEBUGPRINT("%c%c__", dp[0], dp[1]);
90	} else if (dp[0] != '_') {
91		AML_DEBUGPRINT("%c___", dp[0]);
92	}
93}
94
95void
96aml_print_namestring(u_int8_t *dp)
97{
98	int	segcount;
99	int	i;
100
101	if (dp[0] == '\\') {
102		AML_DEBUGPRINT("%c", dp[0]);
103		dp++;
104	} else if (dp[0] == '^') {
105		while (dp[0] == '^') {
106			AML_DEBUGPRINT("%c", dp[0]);
107			dp++;
108		}
109	}
110	if (dp[0] == 0x00) {	/* NullName */
111		/* AML_DEBUGPRINT("<null>"); */
112		dp++;
113	} else if (dp[0] == 0x2e) {	/* DualNamePrefix */
114		aml_print_nameseg(dp + 1);
115		AML_DEBUGPRINT("%c", '.');
116		aml_print_nameseg(dp + 5);
117	} else if (dp[0] == 0x2f) {	/* MultiNamePrefix */
118		segcount = dp[1];
119		for (i = 0, dp += 2; i < segcount; i++, dp += 4) {
120			if (i > 0) {
121				AML_DEBUGPRINT("%c", '.');
122			}
123			aml_print_nameseg(dp);
124		}
125	} else			/* NameSeg */
126		aml_print_nameseg(dp);
127}
128
129int
130aml_print_curname(struct aml_name *name)
131{
132	struct	aml_name *root;
133
134	root = aml_get_rootname();
135	if (name == root) {
136		AML_DEBUGPRINT("\\");
137		return (0);
138	} else {
139		aml_print_curname(name->parent);
140	}
141	aml_print_nameseg((unsigned char *)name->name);
142	AML_DEBUGPRINT(".");
143	return (0);
144}
145
146void
147aml_print_indent(int indent)
148{
149	int	i;
150
151	for (i = 0; i < indent; i++)
152		AML_DEBUGPRINT("    ");
153}
154
155void
156aml_showobject(union aml_object * obj)
157{
158	int	debug;
159	int	i;
160
161	if (obj == NULL) {
162		printf("NO object\n");
163		return;
164	}
165	debug = aml_debug;
166	aml_debug = 1;
167	switch (obj->type) {
168	case aml_t_num:
169		printf("Num:0x%x\n", obj->num.number);
170		break;
171	case aml_t_processor:
172		printf("Processor:No %d,Port 0x%x length 0x%x\n",
173		    obj->proc.id, obj->proc.addr, obj->proc.len);
174		break;
175	case aml_t_mutex:
176		printf("Mutex:Level %d\n", obj->mutex.level);
177		break;
178	case aml_t_powerres:
179		printf("PowerResource:Level %d Order %d\n",
180		    obj->pres.level, obj->pres.order);
181		break;
182	case aml_t_opregion:
183		printf("OprationRegion:Busspace%d, Offset 0x%x Length 0x%x\n",
184		    obj->opregion.space, obj->opregion.offset,
185		    obj->opregion.length);
186		break;
187	case aml_t_field:
188		printf("Fieldelement:flag 0x%x offset 0x%x len 0x%x {",
189		    obj->field.flags, obj->field.bitoffset,
190		    obj->field.bitlen);
191		switch (obj->field.f.ftype) {
192		case f_t_field:
193			aml_print_namestring(obj->field.f.fld.regname);
194			break;
195		case f_t_index:
196			aml_print_namestring(obj->field.f.ifld.indexname);
197			printf(" ");
198			aml_print_namestring(obj->field.f.ifld.dataname);
199			break;
200		case f_t_bank:
201			aml_print_namestring(obj->field.f.bfld.regname);
202			printf(" ");
203			aml_print_namestring(obj->field.f.bfld.bankname);
204			printf("0x%x", obj->field.f.bfld.bankvalue);
205			break;
206		}
207		printf("}\n");
208		break;
209	case aml_t_method:
210		printf("Method: Arg %d From %p To %p\n", obj->meth.argnum,
211		    obj->meth.from, obj->meth.to);
212		break;
213	case aml_t_buffer:
214		printf("Buffer: size:0x%x Data %p\n", obj->buffer.size,
215		    obj->buffer.data);
216		break;
217	case aml_t_device:
218		printf("Device\n");
219		break;
220	case aml_t_bufferfield:
221		printf("Bufferfield:offset 0x%x len 0x%x Origin %p\n",
222		    obj->bfld.bitoffset, obj->bfld.bitlen, obj->bfld.origin);
223		break;
224	case aml_t_string:
225		printf("String:%s\n", obj->str.string);
226		break;
227	case aml_t_package:
228		printf("Package:elements %d \n", obj->package.elements);
229		for (i = 0; i < obj->package.elements; i++) {
230			if (obj->package.objects[i] == NULL) {
231				break;
232			}
233			if (obj->package.objects[i]->type < 0) {
234				continue;
235			}
236			printf("        ");
237			aml_showobject(obj->package.objects[i]);
238		}
239		break;
240	case aml_t_therm:
241		printf("Thermalzone\n");
242		break;
243	case aml_t_event:
244		printf("Event\n");
245		break;
246	case aml_t_ddbhandle:
247		printf("DDBHANDLE\n");
248		break;
249	case aml_t_objref:
250		if (obj->objref.alias == 1) {
251			printf("Alias");
252		} else {
253			printf("Object reference");
254			if (obj->objref.offset >= 0) {
255				printf(" (offset 0x%x)", obj->objref.offset);
256			}
257		}
258		printf(" of ");
259		aml_showobject(obj->objref.ref);
260		break;
261	default:
262		printf("UNK ID=%d\n", obj->type);
263	}
264
265	aml_debug = debug;
266}
267
268void
269aml_showtree(struct aml_name * aname, int lev)
270{
271	int	i;
272	struct	aml_name *ptr;
273	char	name[5];
274
275	for (i = 0; i < lev; i++) {
276		printf("  ");
277	}
278	strncpy(name, aname->name, 4);
279	name[4] = 0;
280	printf("%s  ", name);
281	if (aname->property != NULL) {
282		aml_showobject(aname->property);
283	} else {
284		printf("\n");
285	}
286	for (ptr = aname->child; ptr; ptr = ptr->brother)
287		aml_showtree(ptr, lev + 1);
288}
289
290/*
291 * Common Region I/O Stuff
292 */
293
294static __inline u_int64_t
295aml_adjust_bitmask(u_int32_t flags, u_int32_t bitlen)
296{
297	u_int64_t	bitmask;
298
299	switch (AML_FIELDFLAGS_ACCESSTYPE(flags)) {
300	case AML_FIELDFLAGS_ACCESS_ANYACC:
301		if (bitlen <= 8) {
302			bitmask = 0x000000ff;
303			break;
304		}
305		if (bitlen <= 16) {
306			bitmask = 0x0000ffff;
307			break;
308		}
309		bitmask = 0xffffffff;
310		break;
311	case AML_FIELDFLAGS_ACCESS_BYTEACC:
312		bitmask = 0x000000ff;
313		break;
314	case AML_FIELDFLAGS_ACCESS_WORDACC:
315		bitmask = 0x0000ffff;
316		break;
317	case AML_FIELDFLAGS_ACCESS_DWORDACC:
318	default:
319		bitmask = 0xffffffff;
320		break;
321	}
322
323	switch (bitlen) {
324	case 16:
325		bitmask |= 0x0000ffff;
326		break;
327	case 32:
328		bitmask |= 0xffffffff;
329		break;
330	}
331
332	return (bitmask);
333}
334
335u_int32_t
336aml_adjust_readvalue(u_int32_t flags, u_int32_t bitoffset, u_int32_t bitlen,
337    u_int32_t orgval)
338{
339	u_int32_t	offset, retval;
340	u_int64_t	bitmask;
341
342	offset = bitoffset;	/* XXX bitoffset may change in this function! */
343	bitmask = aml_adjust_bitmask(flags, bitlen);
344	retval = (orgval >> offset) & (~(bitmask << bitlen)) & bitmask;
345
346	return (retval);
347}
348
349u_int32_t
350aml_adjust_updatevalue(u_int32_t flags, u_int32_t bitoffset, u_int32_t bitlen,
351    u_int32_t orgval, u_int32_t value)
352{
353	u_int32_t	offset, retval;
354	u_int64_t	bitmask;
355
356	offset = bitoffset;	/* XXX bitoffset may change in this function! */
357	bitmask = aml_adjust_bitmask(flags, bitlen);
358	retval = orgval;
359	switch (AML_FIELDFLAGS_UPDATERULE(flags)) {
360	case AML_FIELDFLAGS_UPDATE_PRESERVE:
361		retval &= (~(((u_int64_t)1 << bitlen) - 1) << offset) |
362			  (~(bitmask << offset));
363		break;
364	case AML_FIELDFLAGS_UPDATE_WRITEASONES:
365		retval =  (~(((u_int64_t)1 << bitlen) - 1) << offset) |
366			  (~(bitmask << offset));
367		retval &= bitmask;	/* trim the upper bits */
368		break;
369	case AML_FIELDFLAGS_UPDATE_WRITEASZEROS:
370		retval = 0;
371		break;
372	default:
373		printf("illegal update rule: %d\n", flags);
374		return (orgval);
375	}
376
377	retval |= (value << (offset & bitmask));
378	return (retval);
379}
380
381/*
382 * BufferField I/O
383 */
384
385#define AML_BUFFER_INPUT	0
386#define AML_BUFFER_OUTPUT	1
387
388static int	 aml_bufferfield_io(int io, u_int32_t *valuep,
389				    u_int8_t *origin, u_int32_t bitoffset,
390				    u_int32_t bitlen);
391
392static int
393aml_bufferfield_io(int io, u_int32_t *valuep, u_int8_t *origin,
394    u_int32_t bitoffset, u_int32_t bitlen)
395{
396	u_int8_t	val, tmp, masklow, maskhigh;
397	u_int8_t	offsetlow, offsethigh;
398	u_int8_t	*addr;
399	u_int32_t	value, readval;
400	u_int32_t	byteoffset, bytelen, i;
401
402	masklow = maskhigh = 0xff;
403	val = readval = 0;
404	value = *valuep;
405
406	byteoffset = bitoffset / 8;
407	bytelen = bitlen / 8 + ((bitlen % 8) ? 1 : 0);
408	addr = origin + byteoffset;
409
410	/* simple I/O ? */
411	if (bitlen <= 8 || bitlen == 16 || bitlen == 32) {
412		bcopy(addr, &readval, bytelen);
413		AML_DEBUGPRINT("\n\t[bufferfield:0x%x@%p:%d,%d]",
414		    readval, addr, bitoffset % 8, bitlen);
415		switch (io) {
416		case AML_BUFFER_INPUT:
417			value = aml_adjust_readvalue(AML_FIELDFLAGS_ACCESS_BYTEACC,
418			    bitoffset % 8, bitlen, readval);
419			*valuep = value;
420			AML_DEBUGPRINT("\n[read(bufferfield, %p)&mask:0x%x]\n",
421			    addr, value);
422			break;
423		case AML_BUFFER_OUTPUT:
424			value = aml_adjust_updatevalue(AML_FIELDFLAGS_ACCESS_BYTEACC,
425			    bitoffset % 8, bitlen, readval, value);
426			bcopy(&value, addr, bytelen);
427			AML_DEBUGPRINT("->[bufferfield:0x%x@%p:%d,%d]",
428			    value, addr, bitoffset % 8, bitlen);
429			break;
430		}
431		goto out;
432	}
433
434	offsetlow = bitoffset % 8;
435	if (bytelen > 1) {
436		offsethigh = (bitlen - (8 - offsetlow)) % 8;
437	} else {
438		offsethigh = 0;
439	}
440
441	if (offsetlow) {
442		masklow = (~((1 << bitlen) - 1) << offsetlow) | ~(0xff << offsetlow);
443		AML_DEBUGPRINT("\t[offsetlow = 0x%x, masklow = 0x%x, ~masklow = 0x%x]\n",
444		    offsetlow, masklow, ~masklow & 0xff);
445	}
446	if (offsethigh) {
447		maskhigh = 0xff << offsethigh;
448		AML_DEBUGPRINT("\t[offsethigh = 0x%x, maskhigh = 0x%x, ~maskhigh = 0x%x]\n",
449		    offsethigh, maskhigh, ~maskhigh & 0xff);
450	}
451	for (i = bytelen; i > 0; i--, addr++) {
452		val = *addr;
453
454		AML_DEBUGPRINT("\t[bufferfield:0x%02x@%p]", val, addr);
455
456		switch (io) {
457		case AML_BUFFER_INPUT:
458			tmp = val;
459			/* the lowest byte? */
460			if (i == bytelen) {
461				if (offsetlow) {
462					readval = tmp & ~masklow;
463				} else {
464					readval = tmp;
465				}
466			} else {
467				if (i == 1 && offsethigh) {
468					tmp = tmp & ~maskhigh;
469				}
470				readval = (tmp << (8 * (bytelen - i))) | readval;
471			}
472
473			AML_DEBUGPRINT("\n");
474			/* goto to next byte... */
475			if (i > 1) {
476				continue;
477			}
478			/* final adjustment before finishing region access */
479			if (offsetlow) {
480				readval = readval >> offsetlow;
481			}
482			AML_DEBUGPRINT("[read(bufferfield, %p)&mask:0x%x]\n",
483			    addr, readval);
484			*valuep = readval;
485
486			break;
487
488		case AML_BUFFER_OUTPUT:
489			tmp = value & 0xff;
490			/* the lowest byte? */
491			if (i == bytelen) {
492				if (offsetlow) {
493					tmp = (val & masklow) | tmp << offsetlow;
494				}
495				value = value >> (8 - offsetlow);
496			} else {
497				if (i == 1 && offsethigh) {
498					tmp = (val & maskhigh) | tmp;
499				}
500				value = value >> 8;
501			}
502
503			AML_DEBUGPRINT("->[bufferfield:0x%02x@%p]\n",
504			    tmp, addr);
505			*addr = tmp;
506		}
507	}
508out:
509	return (0);
510}
511
512u_int32_t
513aml_bufferfield_read(u_int8_t *origin, u_int32_t bitoffset,
514    u_int32_t bitlen)
515{
516	int	value;
517
518	value = 0;
519	aml_bufferfield_io(AML_BUFFER_INPUT, (u_int32_t *)&value, origin,
520	    bitoffset, bitlen);
521	return (value);
522}
523
524int
525aml_bufferfield_write(u_int32_t value, u_int8_t *origin,
526    u_int32_t bitoffset, u_int32_t bitlen)
527{
528	int	status;
529
530	status = aml_bufferfield_io(AML_BUFFER_OUTPUT, &value,
531	    origin, bitoffset, bitlen);
532	return (status);
533}
534
535int
536aml_region_handle_alloc(struct aml_environ *env, int regtype, u_int32_t flags,
537    u_int32_t baseaddr, u_int32_t bitoffset, u_int32_t bitlen,
538    struct aml_region_handle *h)
539{
540	int	state;
541	struct	aml_name *pci_info;
542
543	state = 0;
544	pci_info = NULL;
545	bzero(h, sizeof(struct aml_region_handle));
546
547	h->env = env;
548	h->regtype = regtype;
549	h->flags = flags;
550	h->baseaddr = baseaddr;
551	h->bitoffset = bitoffset;
552	h->bitlen = bitlen;
553
554	switch (AML_FIELDFLAGS_ACCESSTYPE(flags)) {
555	case AML_FIELDFLAGS_ACCESS_ANYACC:
556		if (bitlen <= 8) {
557			h->unit = 1;
558			break;
559		}
560		if (bitlen <= 16) {
561			h->unit = 2;
562			break;
563		}
564		h->unit = 4;
565		break;
566	case AML_FIELDFLAGS_ACCESS_BYTEACC:
567		h->unit = 1;
568		break;
569	case AML_FIELDFLAGS_ACCESS_WORDACC:
570		h->unit = 2;
571		break;
572	case AML_FIELDFLAGS_ACCESS_DWORDACC:
573		h->unit = 4;
574		break;
575	default:
576		h->unit = 1;
577		break;
578	}
579
580	h->addr = baseaddr + h->unit * ((bitoffset / 8) / h->unit);
581	h->bytelen = baseaddr + ((bitoffset + bitlen) / 8) - h->addr +
582		     ((bitlen % 8) ? 1 : 0);
583
584#ifdef _KERNEL
585	switch (h->regtype) {
586	case AML_REGION_SYSMEM:
587		OsdMapMemory((void *)h->addr, h->bytelen, (void **)&h->vaddr);
588		break;
589
590	case AML_REGION_PCICFG:
591		/* Obtain PCI bus number */
592		pci_info = aml_search_name(env, "_BBN");
593		if (pci_info == NULL || pci_info->property->type != aml_t_num) {
594			AML_DEBUGPRINT("Cannot locate _BBN. Using default 0\n");
595			h->pci_bus = 0;
596		} else {
597			AML_DEBUGPRINT("found _BBN: %d\n",
598			    pci_info->property->num.number);
599			h->pci_bus = pci_info->property->num.number & 0xff;
600		}
601
602		/* Obtain device & function number */
603		pci_info = aml_search_name(env, "_ADR");
604		if (pci_info == NULL || pci_info->property->type != aml_t_num) {
605			printf("Cannot locate: _ADR\n");
606			state = -1;
607			goto out;
608		}
609		h->pci_devfunc = pci_info->property->num.number;
610
611		AML_DEBUGPRINT("[pci%d.%d]", h->pci_bus, h->pci_devfunc);
612		break;
613
614	default:
615		break;
616	}
617
618out:
619#endif	/* _KERNEL */
620	return (state);
621}
622
623void
624aml_region_handle_free(struct aml_region_handle *h)
625{
626#ifdef _KERNEL
627	switch (h->regtype) {
628	case AML_REGION_SYSMEM:
629		OsdUnMapMemory((void *)h->vaddr, h->bytelen);
630		break;
631
632	default:
633		break;
634	}
635#endif	/* _KERNEL */
636}
637
638static int
639aml_region_io_simple(struct aml_environ *env, int io, int regtype,
640    u_int32_t flags, u_int32_t *valuep, u_int32_t baseaddr,
641    u_int32_t bitoffset, u_int32_t bitlen)
642{
643	int		state;
644	u_int32_t	readval, value, offset, bytelen, i;
645	struct		aml_region_handle handle;
646
647	state = aml_region_handle_alloc(env, regtype, flags,
648            baseaddr, bitoffset, bitlen, &handle);
649	if (state == -1) {
650		goto out;
651	}
652
653	readval = 0;
654	offset = bitoffset % (handle.unit * 8);
655	/* limitation of 32 bits alignment */
656	bytelen = (handle.bytelen > 4) ? 4 : handle.bytelen;
657
658	if (io == AML_REGION_INPUT ||
659	    AML_FIELDFLAGS_UPDATERULE(flags) == AML_FIELDFLAGS_UPDATE_PRESERVE) {
660		for (i = 0; i < bytelen; i += handle.unit) {
661			state = aml_region_read_simple(&handle, i, &value);
662			if (state == -1) {
663				goto out;
664			}
665			readval |= (value << (i * 8));
666		}
667		AML_DEBUGPRINT("\t[%d:0x%x@0x%lx:%d,%d]",
668		    regtype, readval, handle.addr, offset, bitlen);
669	}
670
671	switch (io) {
672	case AML_REGION_INPUT:
673		AML_DEBUGPRINT("\n");
674		readval = aml_adjust_readvalue(flags, offset, bitlen, readval);
675		value = readval;
676		value = aml_region_prompt_read(&handle, value);
677		state = aml_region_prompt_update_value(readval, value, &handle);
678		if (state == -1) {
679			goto out;
680		}
681
682		*valuep = value;
683		break;
684	case AML_REGION_OUTPUT:
685		value = *valuep;
686		value = aml_adjust_updatevalue(flags, offset,
687		    bitlen, readval, value);
688		value = aml_region_prompt_write(&handle, value);
689		AML_DEBUGPRINT("\t->[%d:0x%x@0x%lx:%d,%d]\n", regtype, value,
690		    handle.addr, offset, bitlen);
691		for (i = 0; i < bytelen; i += handle.unit) {
692			state = aml_region_write_simple(&handle, i, value);
693			if (state == -1) {
694				goto out;
695			}
696			value = value >> (handle.unit * 8);
697		}
698		break;
699	}
700
701	aml_region_handle_free(&handle);
702out:
703	return (state);
704}
705
706int
707aml_region_io(struct aml_environ *env, int io, int regtype,
708    u_int32_t flags, u_int32_t *valuep, u_int32_t baseaddr,
709    u_int32_t bitoffset, u_int32_t bitlen)
710{
711	u_int32_t	unit, offset;
712	u_int32_t	offadj, bitadj;
713	u_int32_t	value, readval, i;
714	int		state;
715
716	readval = 0;
717	state = 0;
718	unit = 4;	/* limitation of 32 bits alignment */
719	offset = bitoffset % (unit * 8);
720	offadj = 0;
721	bitadj = 0;
722	if (offset + bitlen > unit * 8) {
723		bitadj = bitlen  - (unit * 8 - offset);
724	}
725	for (i = 0; i < offset + bitlen; i += unit * 8) {
726		value = (*valuep) >> offadj;
727		state = aml_region_io_simple(env, io, regtype, flags,
728		    &value, baseaddr, bitoffset + offadj, bitlen - bitadj);
729		if (state == -1) {
730			goto out;
731		}
732		readval |= value << offadj;
733		bitadj = offadj = bitlen - bitadj;
734	}
735	*valuep = readval;
736
737out:
738	return (state);
739}
740