xref: /openbmc/linux/drivers/acpi/acpica/exprep.c (revision b6dcefde)
1 
2 /******************************************************************************
3  *
4  * Module Name: exprep - ACPI AML (p-code) execution - field prep utilities
5  *
6  *****************************************************************************/
7 
8 /*
9  * Copyright (C) 2000 - 2008, Intel Corp.
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions, and the following disclaimer,
17  *    without modification.
18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19  *    substantially similar to the "NO WARRANTY" disclaimer below
20  *    ("Disclaimer") and any redistribution must be conditioned upon
21  *    including a substantially similar Disclaimer requirement for further
22  *    binary redistribution.
23  * 3. Neither the names of the above-listed copyright holders nor the names
24  *    of any contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * Alternatively, this software may be distributed under the terms of the
28  * GNU General Public License ("GPL") version 2 as published by the Free
29  * Software Foundation.
30  *
31  * NO WARRANTY
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42  * POSSIBILITY OF SUCH DAMAGES.
43  */
44 
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acinterp.h"
48 #include "amlcode.h"
49 #include "acnamesp.h"
50 
51 #define _COMPONENT          ACPI_EXECUTER
52 ACPI_MODULE_NAME("exprep")
53 
54 /* Local prototypes */
55 static u32
56 acpi_ex_decode_field_access(union acpi_operand_object *obj_desc,
57 			    u8 field_flags, u32 * return_byte_alignment);
58 
59 #ifdef ACPI_UNDER_DEVELOPMENT
60 
61 static u32
62 acpi_ex_generate_access(u32 field_bit_offset,
63 			u32 field_bit_length, u32 region_length);
64 
65 /*******************************************************************************
66  *
67  * FUNCTION:    acpi_ex_generate_access
68  *
69  * PARAMETERS:  field_bit_offset    - Start of field within parent region/buffer
70  *              field_bit_length    - Length of field in bits
71  *              region_length       - Length of parent in bytes
72  *
73  * RETURN:      Field granularity (8, 16, 32 or 64) and
74  *              byte_alignment (1, 2, 3, or 4)
75  *
76  * DESCRIPTION: Generate an optimal access width for fields defined with the
77  *              any_acc keyword.
78  *
79  * NOTE: Need to have the region_length in order to check for boundary
80  *       conditions (end-of-region).  However, the region_length is a deferred
81  *       operation.  Therefore, to complete this implementation, the generation
82  *       of this access width must be deferred until the region length has
83  *       been evaluated.
84  *
85  ******************************************************************************/
86 
87 static u32
88 acpi_ex_generate_access(u32 field_bit_offset,
89 			u32 field_bit_length, u32 region_length)
90 {
91 	u32 field_byte_length;
92 	u32 field_byte_offset;
93 	u32 field_byte_end_offset;
94 	u32 access_byte_width;
95 	u32 field_start_offset;
96 	u32 field_end_offset;
97 	u32 minimum_access_width = 0xFFFFFFFF;
98 	u32 minimum_accesses = 0xFFFFFFFF;
99 	u32 accesses;
100 
101 	ACPI_FUNCTION_TRACE(ex_generate_access);
102 
103 	/* Round Field start offset and length to "minimal" byte boundaries */
104 
105 	field_byte_offset = ACPI_DIV_8(ACPI_ROUND_DOWN(field_bit_offset, 8));
106 	field_byte_end_offset = ACPI_DIV_8(ACPI_ROUND_UP(field_bit_length +
107 							 field_bit_offset, 8));
108 	field_byte_length = field_byte_end_offset - field_byte_offset;
109 
110 	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
111 			  "Bit length %d, Bit offset %d\n",
112 			  field_bit_length, field_bit_offset));
113 
114 	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
115 			  "Byte Length %d, Byte Offset %d, End Offset %d\n",
116 			  field_byte_length, field_byte_offset,
117 			  field_byte_end_offset));
118 
119 	/*
120 	 * Iterative search for the maximum access width that is both aligned
121 	 * and does not go beyond the end of the region
122 	 *
123 	 * Start at byte_acc and work upwards to qword_acc max. (1,2,4,8 bytes)
124 	 */
125 	for (access_byte_width = 1; access_byte_width <= 8;
126 	     access_byte_width <<= 1) {
127 		/*
128 		 * 1) Round end offset up to next access boundary and make sure that
129 		 *    this does not go beyond the end of the parent region.
130 		 * 2) When the Access width is greater than the field_byte_length, we
131 		 *    are done. (This does not optimize for the perfectly aligned
132 		 *    case yet).
133 		 */
134 		if (ACPI_ROUND_UP(field_byte_end_offset, access_byte_width) <=
135 		    region_length) {
136 			field_start_offset =
137 			    ACPI_ROUND_DOWN(field_byte_offset,
138 					    access_byte_width) /
139 			    access_byte_width;
140 
141 			field_end_offset =
142 			    ACPI_ROUND_UP((field_byte_length +
143 					   field_byte_offset),
144 					  access_byte_width) /
145 			    access_byte_width;
146 
147 			accesses = field_end_offset - field_start_offset;
148 
149 			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
150 					  "AccessWidth %d end is within region\n",
151 					  access_byte_width));
152 
153 			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
154 					  "Field Start %d, Field End %d -- requires %d accesses\n",
155 					  field_start_offset, field_end_offset,
156 					  accesses));
157 
158 			/* Single access is optimal */
159 
160 			if (accesses <= 1) {
161 				ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
162 						  "Entire field can be accessed with one operation of size %d\n",
163 						  access_byte_width));
164 				return_VALUE(access_byte_width);
165 			}
166 
167 			/*
168 			 * Fits in the region, but requires more than one read/write.
169 			 * try the next wider access on next iteration
170 			 */
171 			if (accesses < minimum_accesses) {
172 				minimum_accesses = accesses;
173 				minimum_access_width = access_byte_width;
174 			}
175 		} else {
176 			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
177 					  "AccessWidth %d end is NOT within region\n",
178 					  access_byte_width));
179 			if (access_byte_width == 1) {
180 				ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
181 						  "Field goes beyond end-of-region!\n"));
182 
183 				/* Field does not fit in the region at all */
184 
185 				return_VALUE(0);
186 			}
187 
188 			/*
189 			 * This width goes beyond the end-of-region, back off to
190 			 * previous access
191 			 */
192 			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
193 					  "Backing off to previous optimal access width of %d\n",
194 					  minimum_access_width));
195 			return_VALUE(minimum_access_width);
196 		}
197 	}
198 
199 	/*
200 	 * Could not read/write field with one operation,
201 	 * just use max access width
202 	 */
203 	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
204 			  "Cannot access field in one operation, using width 8\n"));
205 	return_VALUE(8);
206 }
207 #endif				/* ACPI_UNDER_DEVELOPMENT */
208 
209 /*******************************************************************************
210  *
211  * FUNCTION:    acpi_ex_decode_field_access
212  *
213  * PARAMETERS:  obj_desc            - Field object
214  *              field_flags         - Encoded fieldflags (contains access bits)
215  *              return_byte_alignment - Where the byte alignment is returned
216  *
217  * RETURN:      Field granularity (8, 16, 32 or 64) and
218  *              byte_alignment (1, 2, 3, or 4)
219  *
220  * DESCRIPTION: Decode the access_type bits of a field definition.
221  *
222  ******************************************************************************/
223 
224 static u32
225 acpi_ex_decode_field_access(union acpi_operand_object *obj_desc,
226 			    u8 field_flags, u32 * return_byte_alignment)
227 {
228 	u32 access;
229 	u32 byte_alignment;
230 	u32 bit_length;
231 
232 	ACPI_FUNCTION_TRACE(ex_decode_field_access);
233 
234 	access = (field_flags & AML_FIELD_ACCESS_TYPE_MASK);
235 
236 	switch (access) {
237 	case AML_FIELD_ACCESS_ANY:
238 
239 #ifdef ACPI_UNDER_DEVELOPMENT
240 		byte_alignment =
241 		    acpi_ex_generate_access(obj_desc->common_field.
242 					    start_field_bit_offset,
243 					    obj_desc->common_field.bit_length,
244 					    0xFFFFFFFF
245 					    /* Temp until we pass region_length as parameter */
246 		    );
247 		bit_length = byte_alignment * 8;
248 #endif
249 
250 		byte_alignment = 1;
251 		bit_length = 8;
252 		break;
253 
254 	case AML_FIELD_ACCESS_BYTE:
255 	case AML_FIELD_ACCESS_BUFFER:	/* ACPI 2.0 (SMBus Buffer) */
256 		byte_alignment = 1;
257 		bit_length = 8;
258 		break;
259 
260 	case AML_FIELD_ACCESS_WORD:
261 		byte_alignment = 2;
262 		bit_length = 16;
263 		break;
264 
265 	case AML_FIELD_ACCESS_DWORD:
266 		byte_alignment = 4;
267 		bit_length = 32;
268 		break;
269 
270 	case AML_FIELD_ACCESS_QWORD:	/* ACPI 2.0 */
271 		byte_alignment = 8;
272 		bit_length = 64;
273 		break;
274 
275 	default:
276 		/* Invalid field access type */
277 
278 		ACPI_ERROR((AE_INFO, "Unknown field access type %X", access));
279 		return_UINT32(0);
280 	}
281 
282 	if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
283 		/*
284 		 * buffer_field access can be on any byte boundary, so the
285 		 * byte_alignment is always 1 byte -- regardless of any byte_alignment
286 		 * implied by the field access type.
287 		 */
288 		byte_alignment = 1;
289 	}
290 
291 	*return_byte_alignment = byte_alignment;
292 	return_UINT32(bit_length);
293 }
294 
295 /*******************************************************************************
296  *
297  * FUNCTION:    acpi_ex_prep_common_field_object
298  *
299  * PARAMETERS:  obj_desc            - The field object
300  *              field_flags         - Access, lock_rule, and update_rule.
301  *                                    The format of a field_flag is described
302  *                                    in the ACPI specification
303  *              field_attribute     - Special attributes (not used)
304  *              field_bit_position  - Field start position
305  *              field_bit_length    - Field length in number of bits
306  *
307  * RETURN:      Status
308  *
309  * DESCRIPTION: Initialize the areas of the field object that are common
310  *              to the various types of fields.  Note: This is very "sensitive"
311  *              code because we are solving the general case for field
312  *              alignment.
313  *
314  ******************************************************************************/
315 
316 acpi_status
317 acpi_ex_prep_common_field_object(union acpi_operand_object *obj_desc,
318 				 u8 field_flags,
319 				 u8 field_attribute,
320 				 u32 field_bit_position, u32 field_bit_length)
321 {
322 	u32 access_bit_width;
323 	u32 byte_alignment;
324 	u32 nearest_byte_address;
325 
326 	ACPI_FUNCTION_TRACE(ex_prep_common_field_object);
327 
328 	/*
329 	 * Note: the structure being initialized is the
330 	 * ACPI_COMMON_FIELD_INFO;  No structure fields outside of the common
331 	 * area are initialized by this procedure.
332 	 */
333 	obj_desc->common_field.field_flags = field_flags;
334 	obj_desc->common_field.attribute = field_attribute;
335 	obj_desc->common_field.bit_length = field_bit_length;
336 
337 	/*
338 	 * Decode the access type so we can compute offsets.  The access type gives
339 	 * two pieces of information - the width of each field access and the
340 	 * necessary byte_alignment (address granularity) of the access.
341 	 *
342 	 * For any_acc, the access_bit_width is the largest width that is both
343 	 * necessary and possible in an attempt to access the whole field in one
344 	 * I/O operation.  However, for any_acc, the byte_alignment is always one
345 	 * byte.
346 	 *
347 	 * For all Buffer Fields, the byte_alignment is always one byte.
348 	 *
349 	 * For all other access types (Byte, Word, Dword, Qword), the Bitwidth is
350 	 * the same (equivalent) as the byte_alignment.
351 	 */
352 	access_bit_width = acpi_ex_decode_field_access(obj_desc, field_flags,
353 						       &byte_alignment);
354 	if (!access_bit_width) {
355 		return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
356 	}
357 
358 	/* Setup width (access granularity) fields */
359 
360 	obj_desc->common_field.access_byte_width = (u8)
361 	    ACPI_DIV_8(access_bit_width);	/* 1,  2,  4,  8 */
362 
363 	obj_desc->common_field.access_bit_width = (u8) access_bit_width;
364 
365 	/*
366 	 * base_byte_offset is the address of the start of the field within the
367 	 * region.  It is the byte address of the first *datum* (field-width data
368 	 * unit) of the field. (i.e., the first datum that contains at least the
369 	 * first *bit* of the field.)
370 	 *
371 	 * Note: byte_alignment is always either equal to the access_bit_width or 8
372 	 * (Byte access), and it defines the addressing granularity of the parent
373 	 * region or buffer.
374 	 */
375 	nearest_byte_address =
376 	    ACPI_ROUND_BITS_DOWN_TO_BYTES(field_bit_position);
377 	obj_desc->common_field.base_byte_offset = (u32)
378 	    ACPI_ROUND_DOWN(nearest_byte_address, byte_alignment);
379 
380 	/*
381 	 * start_field_bit_offset is the offset of the first bit of the field within
382 	 * a field datum.
383 	 */
384 	obj_desc->common_field.start_field_bit_offset = (u8)
385 	    (field_bit_position -
386 	     ACPI_MUL_8(obj_desc->common_field.base_byte_offset));
387 
388 	/*
389 	 * Does the entire field fit within a single field access element? (datum)
390 	 * (i.e., without crossing a datum boundary)
391 	 */
392 	if ((obj_desc->common_field.start_field_bit_offset +
393 	     field_bit_length) <= (u16) access_bit_width) {
394 		obj_desc->common.flags |= AOPOBJ_SINGLE_DATUM;
395 	}
396 
397 	return_ACPI_STATUS(AE_OK);
398 }
399 
400 /*******************************************************************************
401  *
402  * FUNCTION:    acpi_ex_prep_field_value
403  *
404  * PARAMETERS:  Info    - Contains all field creation info
405  *
406  * RETURN:      Status
407  *
408  * DESCRIPTION: Construct a union acpi_operand_object of type def_field and
409  *              connect it to the parent Node.
410  *
411  ******************************************************************************/
412 
413 acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info)
414 {
415 	union acpi_operand_object *obj_desc;
416 	union acpi_operand_object *second_desc = NULL;
417 	u32 type;
418 	acpi_status status;
419 
420 	ACPI_FUNCTION_TRACE(ex_prep_field_value);
421 
422 	/* Parameter validation */
423 
424 	if (info->field_type != ACPI_TYPE_LOCAL_INDEX_FIELD) {
425 		if (!info->region_node) {
426 			ACPI_ERROR((AE_INFO, "Null RegionNode"));
427 			return_ACPI_STATUS(AE_AML_NO_OPERAND);
428 		}
429 
430 		type = acpi_ns_get_type(info->region_node);
431 		if (type != ACPI_TYPE_REGION) {
432 			ACPI_ERROR((AE_INFO,
433 				    "Needed Region, found type %X (%s)",
434 				    type, acpi_ut_get_type_name(type)));
435 
436 			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
437 		}
438 	}
439 
440 	/* Allocate a new field object */
441 
442 	obj_desc = acpi_ut_create_internal_object(info->field_type);
443 	if (!obj_desc) {
444 		return_ACPI_STATUS(AE_NO_MEMORY);
445 	}
446 
447 	/* Initialize areas of the object that are common to all fields */
448 
449 	obj_desc->common_field.node = info->field_node;
450 	status = acpi_ex_prep_common_field_object(obj_desc, info->field_flags,
451 						  info->attribute,
452 						  info->field_bit_position,
453 						  info->field_bit_length);
454 	if (ACPI_FAILURE(status)) {
455 		acpi_ut_delete_object_desc(obj_desc);
456 		return_ACPI_STATUS(status);
457 	}
458 
459 	/* Initialize areas of the object that are specific to the field type */
460 
461 	switch (info->field_type) {
462 	case ACPI_TYPE_LOCAL_REGION_FIELD:
463 
464 		obj_desc->field.region_obj =
465 		    acpi_ns_get_attached_object(info->region_node);
466 
467 		/* An additional reference for the container */
468 
469 		acpi_ut_add_reference(obj_desc->field.region_obj);
470 
471 		ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
472 				  "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
473 				  obj_desc->field.start_field_bit_offset,
474 				  obj_desc->field.base_byte_offset,
475 				  obj_desc->field.access_byte_width,
476 				  obj_desc->field.region_obj));
477 		break;
478 
479 	case ACPI_TYPE_LOCAL_BANK_FIELD:
480 
481 		obj_desc->bank_field.value = info->bank_value;
482 		obj_desc->bank_field.region_obj =
483 		    acpi_ns_get_attached_object(info->region_node);
484 		obj_desc->bank_field.bank_obj =
485 		    acpi_ns_get_attached_object(info->register_node);
486 
487 		/* An additional reference for the attached objects */
488 
489 		acpi_ut_add_reference(obj_desc->bank_field.region_obj);
490 		acpi_ut_add_reference(obj_desc->bank_field.bank_obj);
491 
492 		ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
493 				  "Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n",
494 				  obj_desc->bank_field.start_field_bit_offset,
495 				  obj_desc->bank_field.base_byte_offset,
496 				  obj_desc->field.access_byte_width,
497 				  obj_desc->bank_field.region_obj,
498 				  obj_desc->bank_field.bank_obj));
499 
500 		/*
501 		 * Remember location in AML stream of the field unit
502 		 * opcode and operands -- since the bank_value
503 		 * operands must be evaluated.
504 		 */
505 		second_desc = obj_desc->common.next_object;
506 		second_desc->extra.aml_start =
507 		    ACPI_CAST_PTR(union acpi_parse_object,
508 				  info->data_register_node)->named.data;
509 		second_desc->extra.aml_length =
510 		    ACPI_CAST_PTR(union acpi_parse_object,
511 				  info->data_register_node)->named.length;
512 
513 		break;
514 
515 	case ACPI_TYPE_LOCAL_INDEX_FIELD:
516 
517 		/* Get the Index and Data registers */
518 
519 		obj_desc->index_field.index_obj =
520 		    acpi_ns_get_attached_object(info->register_node);
521 		obj_desc->index_field.data_obj =
522 		    acpi_ns_get_attached_object(info->data_register_node);
523 
524 		if (!obj_desc->index_field.data_obj
525 		    || !obj_desc->index_field.index_obj) {
526 			ACPI_ERROR((AE_INFO,
527 				    "Null Index Object during field prep"));
528 			acpi_ut_delete_object_desc(obj_desc);
529 			return_ACPI_STATUS(AE_AML_INTERNAL);
530 		}
531 
532 		/* An additional reference for the attached objects */
533 
534 		acpi_ut_add_reference(obj_desc->index_field.data_obj);
535 		acpi_ut_add_reference(obj_desc->index_field.index_obj);
536 
537 		/*
538 		 * April 2006: Changed to match MS behavior
539 		 *
540 		 * The value written to the Index register is the byte offset of the
541 		 * target field in units of the granularity of the index_field
542 		 *
543 		 * Previously, the value was calculated as an index in terms of the
544 		 * width of the Data register, as below:
545 		 *
546 		 *      obj_desc->index_field.Value = (u32)
547 		 *          (Info->field_bit_position / ACPI_MUL_8 (
548 		 *              obj_desc->Field.access_byte_width));
549 		 *
550 		 * February 2006: Tried value as a byte offset:
551 		 *      obj_desc->index_field.Value = (u32)
552 		 *          ACPI_DIV_8 (Info->field_bit_position);
553 		 */
554 		obj_desc->index_field.value =
555 		    (u32) ACPI_ROUND_DOWN(ACPI_DIV_8(info->field_bit_position),
556 					  obj_desc->index_field.
557 					  access_byte_width);
558 
559 		ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
560 				  "IndexField: BitOff %X, Off %X, Value %X, Gran %X, Index %p, Data %p\n",
561 				  obj_desc->index_field.start_field_bit_offset,
562 				  obj_desc->index_field.base_byte_offset,
563 				  obj_desc->index_field.value,
564 				  obj_desc->field.access_byte_width,
565 				  obj_desc->index_field.index_obj,
566 				  obj_desc->index_field.data_obj));
567 		break;
568 
569 	default:
570 		/* No other types should get here */
571 		break;
572 	}
573 
574 	/*
575 	 * Store the constructed descriptor (obj_desc) into the parent Node,
576 	 * preserving the current type of that named_obj.
577 	 */
578 	status = acpi_ns_attach_object(info->field_node, obj_desc,
579 				       acpi_ns_get_type(info->field_node));
580 
581 	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
582 			  "Set NamedObj %p [%4.4s], ObjDesc %p\n",
583 			  info->field_node,
584 			  acpi_ut_get_node_name(info->field_node), obj_desc));
585 
586 	/* Remove local reference to the object */
587 
588 	acpi_ut_remove_reference(obj_desc);
589 	return_ACPI_STATUS(status);
590 }
591