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ARM: dts: sirf: add missed chhifbg node in prima2 and atlas6 dts
[linux-2.6.git] / drivers / acpi / acpica / tbfadt.c
blob9d99f21896935873cd868f68a767f7f074370ec6
1 /******************************************************************************
2 *
3 * Module Name: tbfadt - FADT table utilities
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "actables.h"
47
48 #define _COMPONENT ACPI_TABLES
49 ACPI_MODULE_NAME("tbfadt")
50
51 /* Local prototypes */
52 static void
53 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
54 u8 space_id,
55 u8 byte_width, u64 address, char *register_name);
56
57 static void acpi_tb_convert_fadt(void);
58
59 static void acpi_tb_validate_fadt(void);
60
61 static void acpi_tb_setup_fadt_registers(void);
62
63 /* Table for conversion of FADT to common internal format and FADT validation */
64
65 typedef struct acpi_fadt_info {
66 char *name;
67 u16 address64;
68 u16 address32;
69 u16 length;
70 u8 default_length;
71 u8 type;
72
73 } acpi_fadt_info;
74
75 #define ACPI_FADT_OPTIONAL 0
76 #define ACPI_FADT_REQUIRED 1
77 #define ACPI_FADT_SEPARATE_LENGTH 2
78
79 static struct acpi_fadt_info fadt_info_table[] = {
80 {"Pm1aEventBlock",
81 ACPI_FADT_OFFSET(xpm1a_event_block),
82 ACPI_FADT_OFFSET(pm1a_event_block),
83 ACPI_FADT_OFFSET(pm1_event_length),
84 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
85 ACPI_FADT_REQUIRED},
86
87 {"Pm1bEventBlock",
88 ACPI_FADT_OFFSET(xpm1b_event_block),
89 ACPI_FADT_OFFSET(pm1b_event_block),
90 ACPI_FADT_OFFSET(pm1_event_length),
91 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
92 ACPI_FADT_OPTIONAL},
93
94 {"Pm1aControlBlock",
95 ACPI_FADT_OFFSET(xpm1a_control_block),
96 ACPI_FADT_OFFSET(pm1a_control_block),
97 ACPI_FADT_OFFSET(pm1_control_length),
98 ACPI_PM1_REGISTER_WIDTH,
99 ACPI_FADT_REQUIRED},
100
101 {"Pm1bControlBlock",
102 ACPI_FADT_OFFSET(xpm1b_control_block),
103 ACPI_FADT_OFFSET(pm1b_control_block),
104 ACPI_FADT_OFFSET(pm1_control_length),
105 ACPI_PM1_REGISTER_WIDTH,
106 ACPI_FADT_OPTIONAL},
107
108 {"Pm2ControlBlock",
109 ACPI_FADT_OFFSET(xpm2_control_block),
110 ACPI_FADT_OFFSET(pm2_control_block),
111 ACPI_FADT_OFFSET(pm2_control_length),
112 ACPI_PM2_REGISTER_WIDTH,
113 ACPI_FADT_SEPARATE_LENGTH},
114
115 {"PmTimerBlock",
116 ACPI_FADT_OFFSET(xpm_timer_block),
117 ACPI_FADT_OFFSET(pm_timer_block),
118 ACPI_FADT_OFFSET(pm_timer_length),
119 ACPI_PM_TIMER_WIDTH,
120 ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */
121
122 {"Gpe0Block",
123 ACPI_FADT_OFFSET(xgpe0_block),
124 ACPI_FADT_OFFSET(gpe0_block),
125 ACPI_FADT_OFFSET(gpe0_block_length),
126 0,
127 ACPI_FADT_SEPARATE_LENGTH},
128
129 {"Gpe1Block",
130 ACPI_FADT_OFFSET(xgpe1_block),
131 ACPI_FADT_OFFSET(gpe1_block),
132 ACPI_FADT_OFFSET(gpe1_block_length),
133 0,
134 ACPI_FADT_SEPARATE_LENGTH}
135 };
136
137 #define ACPI_FADT_INFO_ENTRIES \
138 (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
139
140 /* Table used to split Event Blocks into separate status/enable registers */
141
142 typedef struct acpi_fadt_pm_info {
143 struct acpi_generic_address *target;
144 u16 source;
145 u8 register_num;
146
147 } acpi_fadt_pm_info;
148
149 static struct acpi_fadt_pm_info fadt_pm_info_table[] = {
150 {&acpi_gbl_xpm1a_status,
151 ACPI_FADT_OFFSET(xpm1a_event_block),
152 0},
153
154 {&acpi_gbl_xpm1a_enable,
155 ACPI_FADT_OFFSET(xpm1a_event_block),
156 1},
157
158 {&acpi_gbl_xpm1b_status,
159 ACPI_FADT_OFFSET(xpm1b_event_block),
160 0},
161
162 {&acpi_gbl_xpm1b_enable,
163 ACPI_FADT_OFFSET(xpm1b_event_block),
164 1}
165 };
166
167 #define ACPI_FADT_PM_INFO_ENTRIES \
168 (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info))
169
170 /*******************************************************************************
171 *
172 * FUNCTION: acpi_tb_init_generic_address
173 *
174 * PARAMETERS: generic_address - GAS struct to be initialized
175 * space_id - ACPI Space ID for this register
176 * byte_width - Width of this register
177 * address - Address of the register
178 *
179 * RETURN: None
180 *
181 * DESCRIPTION: Initialize a Generic Address Structure (GAS)
182 * See the ACPI specification for a full description and
183 * definition of this structure.
184 *
185 ******************************************************************************/
186
187 static void
188 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
189 u8 space_id,
190 u8 byte_width, u64 address, char *register_name)
191 {
192 u8 bit_width;
193
194 /* Bit width field in the GAS is only one byte long, 255 max */
195
196 bit_width = (u8)(byte_width * 8);
197
198 if (byte_width > 31) { /* (31*8)=248 */
199 ACPI_ERROR((AE_INFO,
200 "%s - 32-bit FADT register is too long (%u bytes, %u bits) "
201 "to convert to GAS struct - 255 bits max, truncating",
202 register_name, byte_width, (byte_width * 8)));
203
204 bit_width = 255;
205 }
206
207 /*
208 * The 64-bit Address field is non-aligned in the byte packed
209 * GAS struct.
210 */
211 ACPI_MOVE_64_TO_64(&generic_address->address, &address);
212
213 /* All other fields are byte-wide */
214
215 generic_address->space_id = space_id;
216 generic_address->bit_width = bit_width;
217 generic_address->bit_offset = 0;
218 generic_address->access_width = 0; /* Access width ANY */
219 }
220
221 /*******************************************************************************
222 *
223 * FUNCTION: acpi_tb_parse_fadt
224 *
225 * PARAMETERS: table_index - Index for the FADT
226 *
227 * RETURN: None
228 *
229 * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
230 * (FADT contains the addresses of the DSDT and FACS)
231 *
232 ******************************************************************************/
233
234 void acpi_tb_parse_fadt(u32 table_index)
235 {
236 u32 length;
237 struct acpi_table_header *table;
238
239 /*
240 * The FADT has multiple versions with different lengths,
241 * and it contains pointers to both the DSDT and FACS tables.
242 *
243 * Get a local copy of the FADT and convert it to a common format
244 * Map entire FADT, assumed to be smaller than one page.
245 */
246 length = acpi_gbl_root_table_list.tables[table_index].length;
247
248 table =
249 acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
250 address, length);
251 if (!table) {
252 return;
253 }
254
255 /*
256 * Validate the FADT checksum before we copy the table. Ignore
257 * checksum error as we want to try to get the DSDT and FACS.
258 */
259 (void)acpi_tb_verify_checksum(table, length);
260
261 /* Create a local copy of the FADT in common ACPI 2.0+ format */
262
263 acpi_tb_create_local_fadt(table, length);
264
265 /* All done with the real FADT, unmap it */
266
267 acpi_os_unmap_memory(table, length);
268
269 /* Obtain the DSDT and FACS tables via their addresses within the FADT */
270
271 acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
272 ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
273
274 /* If Hardware Reduced flag is set, there is no FACS */
275
276 if (!acpi_gbl_reduced_hardware) {
277 acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.
278 Xfacs, ACPI_SIG_FACS,
279 ACPI_TABLE_INDEX_FACS);
280 }
281 }
282
283 /*******************************************************************************
284 *
285 * FUNCTION: acpi_tb_create_local_fadt
286 *
287 * PARAMETERS: table - Pointer to BIOS FADT
288 * length - Length of the table
289 *
290 * RETURN: None
291 *
292 * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
293 * Performs validation on some important FADT fields.
294 *
295 * NOTE: We create a local copy of the FADT regardless of the version.
296 *
297 ******************************************************************************/
298
299 void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
300 {
301 /*
302 * Check if the FADT is larger than the largest table that we expect
303 * (the ACPI 5.0 version). If so, truncate the table, and issue
304 * a warning.
305 */
306 if (length > sizeof(struct acpi_table_fadt)) {
307 ACPI_BIOS_WARNING((AE_INFO,
308 "FADT (revision %u) is longer than ACPI 5.0 version, "
309 "truncating length %u to %u",
310 table->revision, length,
311 (u32)sizeof(struct acpi_table_fadt)));
312 }
313
314 /* Clear the entire local FADT */
315
316 ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
317
318 /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
319
320 ACPI_MEMCPY(&acpi_gbl_FADT, table,
321 ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
322
323 /* Take a copy of the Hardware Reduced flag */
324
325 acpi_gbl_reduced_hardware = FALSE;
326 if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
327 acpi_gbl_reduced_hardware = TRUE;
328 }
329
330 /* Convert the local copy of the FADT to the common internal format */
331
332 acpi_tb_convert_fadt();
333
334 /* Validate FADT values now, before we make any changes */
335
336 acpi_tb_validate_fadt();
337
338 /* Initialize the global ACPI register structures */
339
340 acpi_tb_setup_fadt_registers();
341 }
342
343 /*******************************************************************************
344 *
345 * FUNCTION: acpi_tb_convert_fadt
346 *
347 * PARAMETERS: None, uses acpi_gbl_FADT
348 *
349 * RETURN: None
350 *
351 * DESCRIPTION: Converts all versions of the FADT to a common internal format.
352 * Expand 32-bit addresses to 64-bit as necessary.
353 *
354 * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt),
355 * and must contain a copy of the actual FADT.
356 *
357 * Notes on 64-bit register addresses:
358 *
359 * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
360 * fields of the FADT for all ACPI register addresses.
361 *
362 * The 64-bit "X" fields are optional extensions to the original 32-bit FADT
363 * V1.0 fields. Even if they are present in the FADT, they are optional and
364 * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
365 * 32-bit V1.0 fields if the corresponding X field is zero.
366 *
367 * For ACPI 1.0 FADTs, all 32-bit address fields are expanded to the
368 * corresponding "X" fields in the internal FADT.
369 *
370 * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
371 * to the corresponding 64-bit X fields. For compatibility with other ACPI
372 * implementations, we ignore the 64-bit field if the 32-bit field is valid,
373 * regardless of whether the host OS is 32-bit or 64-bit.
374 *
375 ******************************************************************************/
376
377 static void acpi_tb_convert_fadt(void)
378 {
379 struct acpi_generic_address *address64;
380 u32 address32;
381 u32 i;
382
383 /*
384 * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
385 * Later code will always use the X 64-bit field. Also, check for an
386 * address mismatch between the 32-bit and 64-bit address fields
387 * (FIRMWARE_CTRL/X_FIRMWARE_CTRL, DSDT/X_DSDT) which would indicate
388 * the presence of two FACS or two DSDT tables.
389 */
390 if (!acpi_gbl_FADT.Xfacs) {
391 acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
392 } else if (acpi_gbl_FADT.facs &&
393 (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
394 ACPI_WARNING((AE_INFO,
395 "32/64 FACS address mismatch in FADT - two FACS tables!"));
396 }
397
398 if (!acpi_gbl_FADT.Xdsdt) {
399 acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
400 } else if (acpi_gbl_FADT.dsdt &&
401 (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
402 ACPI_WARNING((AE_INFO,
403 "32/64 DSDT address mismatch in FADT - two DSDT tables!"));
404 }
405
406 /*
407 * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
408 * should be zero are indeed zero. This will workaround BIOSs that
409 * inadvertently place values in these fields.
410 *
411 * The ACPI 1.0 reserved fields that will be zeroed are the bytes located
412 * at offset 45, 55, 95, and the word located at offset 109, 110.
413 *
414 * Note: The FADT revision value is unreliable. Only the length can be
415 * trusted.
416 */
417 if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
418 acpi_gbl_FADT.preferred_profile = 0;
419 acpi_gbl_FADT.pstate_control = 0;
420 acpi_gbl_FADT.cst_control = 0;
421 acpi_gbl_FADT.boot_flags = 0;
422 }
423
424 /* Update the local FADT table header length */
425
426 acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
427
428 /*
429 * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
430 * generic address structures as necessary. Later code will always use
431 * the 64-bit address structures.
432 *
433 * March 2009:
434 * We now always use the 32-bit address if it is valid (non-null). This
435 * is not in accordance with the ACPI specification which states that
436 * the 64-bit address supersedes the 32-bit version, but we do this for
437 * compatibility with other ACPI implementations. Most notably, in the
438 * case where both the 32 and 64 versions are non-null, we use the 32-bit
439 * version. This is the only address that is guaranteed to have been
440 * tested by the BIOS manufacturer.
441 */
442 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
443 address32 = *ACPI_ADD_PTR(u32,
444 &acpi_gbl_FADT,
445 fadt_info_table[i].address32);
446
447 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
448 &acpi_gbl_FADT,
449 fadt_info_table[i].address64);
450
451 /*
452 * If both 32- and 64-bit addresses are valid (non-zero),
453 * they must match.
454 */
455 if (address64->address && address32 &&
456 (address64->address != (u64)address32)) {
457 ACPI_BIOS_ERROR((AE_INFO,
458 "32/64X address mismatch in FADT/%s: "
459 "0x%8.8X/0x%8.8X%8.8X, using 32",
460 fadt_info_table[i].name, address32,
461 ACPI_FORMAT_UINT64(address64->
462 address)));
463 }
464
465 /* Always use 32-bit address if it is valid (non-null) */
466
467 if (address32) {
468 /*
469 * Copy the 32-bit address to the 64-bit GAS structure. The
470 * Space ID is always I/O for 32-bit legacy address fields
471 */
472 acpi_tb_init_generic_address(address64,
473 ACPI_ADR_SPACE_SYSTEM_IO,
474 *ACPI_ADD_PTR(u8,
475 &acpi_gbl_FADT,
476 fadt_info_table
477 [i].length),
478 (u64) address32,
479 fadt_info_table[i].name);
480 }
481 }
482 }
483
484 /*******************************************************************************
485 *
486 * FUNCTION: acpi_tb_validate_fadt
487 *
488 * PARAMETERS: table - Pointer to the FADT to be validated
489 *
490 * RETURN: None
491 *
492 * DESCRIPTION: Validate various important fields within the FADT. If a problem
493 * is found, issue a message, but no status is returned.
494 * Used by both the table manager and the disassembler.
495 *
496 * Possible additional checks:
497 * (acpi_gbl_FADT.pm1_event_length >= 4)
498 * (acpi_gbl_FADT.pm1_control_length >= 2)
499 * (acpi_gbl_FADT.pm_timer_length >= 4)
500 * Gpe block lengths must be multiple of 2
501 *
502 ******************************************************************************/
503
504 static void acpi_tb_validate_fadt(void)
505 {
506 char *name;
507 struct acpi_generic_address *address64;
508 u8 length;
509 u32 i;
510
511 /*
512 * Check for FACS and DSDT address mismatches. An address mismatch between
513 * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
514 * DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables.
515 */
516 if (acpi_gbl_FADT.facs &&
517 (acpi_gbl_FADT.Xfacs != (u64)acpi_gbl_FADT.facs)) {
518 ACPI_BIOS_WARNING((AE_INFO,
519 "32/64X FACS address mismatch in FADT - "
520 "0x%8.8X/0x%8.8X%8.8X, using 32",
521 acpi_gbl_FADT.facs,
522 ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs)));
523
524 acpi_gbl_FADT.Xfacs = (u64)acpi_gbl_FADT.facs;
525 }
526
527 if (acpi_gbl_FADT.dsdt &&
528 (acpi_gbl_FADT.Xdsdt != (u64)acpi_gbl_FADT.dsdt)) {
529 ACPI_BIOS_WARNING((AE_INFO,
530 "32/64X DSDT address mismatch in FADT - "
531 "0x%8.8X/0x%8.8X%8.8X, using 32",
532 acpi_gbl_FADT.dsdt,
533 ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt)));
534
535 acpi_gbl_FADT.Xdsdt = (u64)acpi_gbl_FADT.dsdt;
536 }
537
538 /* If Hardware Reduced flag is set, we are all done */
539
540 if (acpi_gbl_reduced_hardware) {
541 return;
542 }
543
544 /* Examine all of the 64-bit extended address fields (X fields) */
545
546 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
547 /*
548 * Generate pointer to the 64-bit address, get the register
549 * length (width) and the register name
550 */
551 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
552 &acpi_gbl_FADT,
553 fadt_info_table[i].address64);
554 length =
555 *ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
556 fadt_info_table[i].length);
557 name = fadt_info_table[i].name;
558
559 /*
560 * For each extended field, check for length mismatch between the
561 * legacy length field and the corresponding 64-bit X length field.
562 * Note: If the legacy length field is > 0xFF bits, ignore this
563 * check. (GPE registers can be larger than the 64-bit GAS structure
564 * can accomodate, 0xFF bits).
565 */
566 if (address64->address &&
567 (ACPI_MUL_8(length) <= ACPI_UINT8_MAX) &&
568 (address64->bit_width != ACPI_MUL_8(length))) {
569 ACPI_BIOS_WARNING((AE_INFO,
570 "32/64X length mismatch in FADT/%s: %u/%u",
571 name, ACPI_MUL_8(length),
572 address64->bit_width));
573 }
574
575 if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
576 /*
577 * Field is required (Pm1a_event, Pm1a_control).
578 * Both the address and length must be non-zero.
579 */
580 if (!address64->address || !length) {
581 ACPI_BIOS_ERROR((AE_INFO,
582 "Required FADT field %s has zero address and/or length: "
583 "0x%8.8X%8.8X/0x%X",
584 name,
585 ACPI_FORMAT_UINT64(address64->
586 address),
587 length));
588 }
589 } else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
590 /*
591 * Field is optional (Pm2_control, GPE0, GPE1) AND has its own
592 * length field. If present, both the address and length must
593 * be valid.
594 */
595 if ((address64->address && !length) ||
596 (!address64->address && length)) {
597 ACPI_BIOS_WARNING((AE_INFO,
598 "Optional FADT field %s has zero address or length: "
599 "0x%8.8X%8.8X/0x%X",
600 name,
601 ACPI_FORMAT_UINT64
602 (address64->address),
603 length));
604 }
605 }
606 }
607 }
608
609 /*******************************************************************************
610 *
611 * FUNCTION: acpi_tb_setup_fadt_registers
612 *
613 * PARAMETERS: None, uses acpi_gbl_FADT.
614 *
615 * RETURN: None
616 *
617 * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
618 * force FADT register definitions to their default lengths.
619 *
620 ******************************************************************************/
621
622 static void acpi_tb_setup_fadt_registers(void)
623 {
624 struct acpi_generic_address *target64;
625 struct acpi_generic_address *source64;
626 u8 pm1_register_byte_width;
627 u32 i;
628
629 /*
630 * Optionally check all register lengths against the default values and
631 * update them if they are incorrect.
632 */
633 if (acpi_gbl_use_default_register_widths) {
634 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
635 target64 =
636 ACPI_ADD_PTR(struct acpi_generic_address,
637 &acpi_gbl_FADT,
638 fadt_info_table[i].address64);
639
640 /*
641 * If a valid register (Address != 0) and the (default_length > 0)
642 * (Not a GPE register), then check the width against the default.
643 */
644 if ((target64->address) &&
645 (fadt_info_table[i].default_length > 0) &&
646 (fadt_info_table[i].default_length !=
647 target64->bit_width)) {
648 ACPI_BIOS_WARNING((AE_INFO,
649 "Invalid length for FADT/%s: %u, using default %u",
650 fadt_info_table[i].name,
651 target64->bit_width,
652 fadt_info_table[i].
653 default_length));
654
655 /* Incorrect size, set width to the default */
656
657 target64->bit_width =
658 fadt_info_table[i].default_length;
659 }
660 }
661 }
662
663 /*
664 * Get the length of the individual PM1 registers (enable and status).
665 * Each register is defined to be (event block length / 2). Extra divide
666 * by 8 converts bits to bytes.
667 */
668 pm1_register_byte_width = (u8)
669 ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
670
671 /*
672 * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
673 * registers. These addresses do not appear (directly) in the FADT, so it
674 * is useful to pre-calculate them from the PM1 Event Block definitions.
675 *
676 * The PM event blocks are split into two register blocks, first is the
677 * PM Status Register block, followed immediately by the PM Enable
678 * Register block. Each is of length (pm1_event_length/2)
679 *
680 * Note: The PM1A event block is required by the ACPI specification.
681 * However, the PM1B event block is optional and is rarely, if ever,
682 * used.
683 */
684
685 for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
686 source64 =
687 ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
688 fadt_pm_info_table[i].source);
689
690 if (source64->address) {
691 acpi_tb_init_generic_address(fadt_pm_info_table[i].
692 target, source64->space_id,
693 pm1_register_byte_width,
694 source64->address +
695 (fadt_pm_info_table[i].
696 register_num *
697 pm1_register_byte_width),
698 "PmRegisters");
699 }
700 }
701 }
Linus' kernel tree