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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: hwregs - Read/write access functions for the various ACPI | |
4 | * control and status registers. | |
5 | * | |
6 | ******************************************************************************/ | |
7 | ||
8 | /* | |
25f044e6 | 9 | * Copyright (C) 2000 - 2013, Intel Corp. |
1da177e4 LT |
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 | ||
1da177e4 | 45 | #include <acpi/acpi.h> |
e2f7a777 | 46 | #include "accommon.h" |
e2f7a777 | 47 | #include "acevents.h" |
1da177e4 LT |
48 | |
49 | #define _COMPONENT ACPI_HARDWARE | |
4be44fcd | 50 | ACPI_MODULE_NAME("hwregs") |
1da177e4 | 51 | |
33620c54 | 52 | #if (!ACPI_REDUCED_HARDWARE) |
c520abad BM |
53 | /* Local Prototypes */ |
54 | static acpi_status | |
55 | acpi_hw_read_multiple(u32 *value, | |
56 | struct acpi_generic_address *register_a, | |
57 | struct acpi_generic_address *register_b); | |
58 | ||
59 | static acpi_status | |
60 | acpi_hw_write_multiple(u32 value, | |
61 | struct acpi_generic_address *register_a, | |
62 | struct acpi_generic_address *register_b); | |
63 | ||
33620c54 BM |
64 | #endif /* !ACPI_REDUCED_HARDWARE */ |
65 | ||
c6b5774c BM |
66 | /****************************************************************************** |
67 | * | |
68 | * FUNCTION: acpi_hw_validate_register | |
69 | * | |
ba494bee | 70 | * PARAMETERS: reg - GAS register structure |
c6b5774c | 71 | * max_bit_width - Max bit_width supported (32 or 64) |
ba494bee | 72 | * address - Pointer to where the gas->address |
c6b5774c BM |
73 | * is returned |
74 | * | |
75 | * RETURN: Status | |
76 | * | |
77 | * DESCRIPTION: Validate the contents of a GAS register. Checks the GAS | |
78 | * pointer, Address, space_id, bit_width, and bit_offset. | |
79 | * | |
80 | ******************************************************************************/ | |
81 | ||
82 | acpi_status | |
83 | acpi_hw_validate_register(struct acpi_generic_address *reg, | |
84 | u8 max_bit_width, u64 *address) | |
85 | { | |
86 | ||
87 | /* Must have a valid pointer to a GAS structure */ | |
88 | ||
89 | if (!reg) { | |
90 | return (AE_BAD_PARAMETER); | |
91 | } | |
92 | ||
93 | /* | |
94 | * Copy the target address. This handles possible alignment issues. | |
95 | * Address must not be null. A null address also indicates an optional | |
96 | * ACPI register that is not supported, so no error message. | |
97 | */ | |
98 | ACPI_MOVE_64_TO_64(address, ®->address); | |
99 | if (!(*address)) { | |
100 | return (AE_BAD_ADDRESS); | |
101 | } | |
102 | ||
ba494bee | 103 | /* Validate the space_ID */ |
c6b5774c BM |
104 | |
105 | if ((reg->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) && | |
106 | (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO)) { | |
107 | ACPI_ERROR((AE_INFO, | |
108 | "Unsupported address space: 0x%X", reg->space_id)); | |
109 | return (AE_SUPPORT); | |
110 | } | |
111 | ||
112 | /* Validate the bit_width */ | |
113 | ||
114 | if ((reg->bit_width != 8) && | |
115 | (reg->bit_width != 16) && | |
116 | (reg->bit_width != 32) && (reg->bit_width != max_bit_width)) { | |
117 | ACPI_ERROR((AE_INFO, | |
118 | "Unsupported register bit width: 0x%X", | |
119 | reg->bit_width)); | |
120 | return (AE_SUPPORT); | |
121 | } | |
122 | ||
123 | /* Validate the bit_offset. Just a warning for now. */ | |
124 | ||
125 | if (reg->bit_offset != 0) { | |
126 | ACPI_WARNING((AE_INFO, | |
127 | "Unsupported register bit offset: 0x%X", | |
128 | reg->bit_offset)); | |
129 | } | |
130 | ||
131 | return (AE_OK); | |
132 | } | |
133 | ||
134 | /****************************************************************************** | |
135 | * | |
136 | * FUNCTION: acpi_hw_read | |
137 | * | |
ba494bee BM |
138 | * PARAMETERS: value - Where the value is returned |
139 | * reg - GAS register structure | |
c6b5774c BM |
140 | * |
141 | * RETURN: Status | |
142 | * | |
143 | * DESCRIPTION: Read from either memory or IO space. This is a 32-bit max | |
144 | * version of acpi_read, used internally since the overhead of | |
145 | * 64-bit values is not needed. | |
146 | * | |
147 | * LIMITATIONS: <These limitations also apply to acpi_hw_write> | |
148 | * bit_width must be exactly 8, 16, or 32. | |
ba494bee | 149 | * space_ID must be system_memory or system_IO. |
c6b5774c BM |
150 | * bit_offset and access_width are currently ignored, as there has |
151 | * not been a need to implement these. | |
152 | * | |
153 | ******************************************************************************/ | |
154 | ||
155 | acpi_status acpi_hw_read(u32 *value, struct acpi_generic_address *reg) | |
156 | { | |
157 | u64 address; | |
653f4b53 | 158 | u64 value64; |
c6b5774c BM |
159 | acpi_status status; |
160 | ||
161 | ACPI_FUNCTION_NAME(hw_read); | |
162 | ||
163 | /* Validate contents of the GAS register */ | |
164 | ||
165 | status = acpi_hw_validate_register(reg, 32, &address); | |
166 | if (ACPI_FAILURE(status)) { | |
167 | return (status); | |
168 | } | |
169 | ||
170 | /* Initialize entire 32-bit return value to zero */ | |
171 | ||
172 | *value = 0; | |
173 | ||
174 | /* | |
175 | * Two address spaces supported: Memory or IO. PCI_Config is | |
176 | * not supported here because the GAS structure is insufficient | |
177 | */ | |
178 | if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { | |
179 | status = acpi_os_read_memory((acpi_physical_address) | |
653f4b53 BM |
180 | address, &value64, reg->bit_width); |
181 | ||
182 | *value = (u32)value64; | |
c6b5774c BM |
183 | } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ |
184 | ||
185 | status = acpi_hw_read_port((acpi_io_address) | |
186 | address, value, reg->bit_width); | |
187 | } | |
188 | ||
189 | ACPI_DEBUG_PRINT((ACPI_DB_IO, | |
190 | "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n", | |
191 | *value, reg->bit_width, ACPI_FORMAT_UINT64(address), | |
192 | acpi_ut_get_region_name(reg->space_id))); | |
193 | ||
194 | return (status); | |
195 | } | |
196 | ||
197 | /****************************************************************************** | |
198 | * | |
199 | * FUNCTION: acpi_hw_write | |
200 | * | |
ba494bee BM |
201 | * PARAMETERS: value - Value to be written |
202 | * reg - GAS register structure | |
c6b5774c BM |
203 | * |
204 | * RETURN: Status | |
205 | * | |
206 | * DESCRIPTION: Write to either memory or IO space. This is a 32-bit max | |
207 | * version of acpi_write, used internally since the overhead of | |
208 | * 64-bit values is not needed. | |
209 | * | |
210 | ******************************************************************************/ | |
211 | ||
212 | acpi_status acpi_hw_write(u32 value, struct acpi_generic_address *reg) | |
213 | { | |
214 | u64 address; | |
215 | acpi_status status; | |
216 | ||
217 | ACPI_FUNCTION_NAME(hw_write); | |
218 | ||
219 | /* Validate contents of the GAS register */ | |
220 | ||
221 | status = acpi_hw_validate_register(reg, 32, &address); | |
222 | if (ACPI_FAILURE(status)) { | |
223 | return (status); | |
224 | } | |
225 | ||
226 | /* | |
227 | * Two address spaces supported: Memory or IO. PCI_Config is | |
228 | * not supported here because the GAS structure is insufficient | |
229 | */ | |
230 | if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { | |
231 | status = acpi_os_write_memory((acpi_physical_address) | |
653f4b53 BM |
232 | address, (u64)value, |
233 | reg->bit_width); | |
c6b5774c BM |
234 | } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ |
235 | ||
236 | status = acpi_hw_write_port((acpi_io_address) | |
237 | address, value, reg->bit_width); | |
238 | } | |
239 | ||
240 | ACPI_DEBUG_PRINT((ACPI_DB_IO, | |
241 | "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n", | |
242 | value, reg->bit_width, ACPI_FORMAT_UINT64(address), | |
243 | acpi_ut_get_region_name(reg->space_id))); | |
244 | ||
245 | return (status); | |
246 | } | |
247 | ||
33620c54 | 248 | #if (!ACPI_REDUCED_HARDWARE) |
1da177e4 LT |
249 | /******************************************************************************* |
250 | * | |
251 | * FUNCTION: acpi_hw_clear_acpi_status | |
252 | * | |
d8c71b6d | 253 | * PARAMETERS: None |
1da177e4 | 254 | * |
7db5d82d | 255 | * RETURN: Status |
1da177e4 LT |
256 | * |
257 | * DESCRIPTION: Clears all fixed and general purpose status bits | |
1da177e4 LT |
258 | * |
259 | ******************************************************************************/ | |
c520abad | 260 | |
d8c71b6d | 261 | acpi_status acpi_hw_clear_acpi_status(void) |
1da177e4 | 262 | { |
4be44fcd | 263 | acpi_status status; |
4c90ece2 | 264 | acpi_cpu_flags lock_flags = 0; |
1da177e4 | 265 | |
b229cf92 | 266 | ACPI_FUNCTION_TRACE(hw_clear_acpi_status); |
1da177e4 | 267 | |
8eb7b247 | 268 | ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %8.8X%8.8X\n", |
4be44fcd | 269 | ACPI_BITMASK_ALL_FIXED_STATUS, |
8eb7b247 | 270 | ACPI_FORMAT_UINT64(acpi_gbl_xpm1a_status.address))); |
1da177e4 | 271 | |
4c90ece2 | 272 | lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); |
1da177e4 | 273 | |
227243a0 | 274 | /* Clear the fixed events in PM1 A/B */ |
531c633d | 275 | |
d30dc9ab | 276 | status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, |
4be44fcd | 277 | ACPI_BITMASK_ALL_FIXED_STATUS); |
f7f71cfb RM |
278 | |
279 | acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); | |
280 | ||
281 | if (ACPI_FAILURE(status)) | |
282 | goto exit; | |
1da177e4 | 283 | |
1da177e4 LT |
284 | /* Clear the GPE Bits in all GPE registers in all GPE blocks */ |
285 | ||
e97d6bf1 | 286 | status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block, NULL); |
1da177e4 | 287 | |
f7f71cfb | 288 | exit: |
4be44fcd | 289 | return_ACPI_STATUS(status); |
1da177e4 LT |
290 | } |
291 | ||
1da177e4 LT |
292 | /******************************************************************************* |
293 | * | |
33620c54 | 294 | * FUNCTION: acpi_hw_get_bit_register_info |
1da177e4 LT |
295 | * |
296 | * PARAMETERS: register_id - Index of ACPI Register to access | |
297 | * | |
44f6c012 | 298 | * RETURN: The bitmask to be used when accessing the register |
1da177e4 | 299 | * |
44f6c012 | 300 | * DESCRIPTION: Map register_id into a register bitmask. |
1da177e4 LT |
301 | * |
302 | ******************************************************************************/ | |
7db5d82d | 303 | |
4be44fcd | 304 | struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id) |
1da177e4 | 305 | { |
4a90c7e8 | 306 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
307 | |
308 | if (register_id > ACPI_BITREG_MAX) { | |
f6a22b0b | 309 | ACPI_ERROR((AE_INFO, "Invalid BitRegister ID: 0x%X", |
b8e4d893 | 310 | register_id)); |
1da177e4 LT |
311 | return (NULL); |
312 | } | |
313 | ||
314 | return (&acpi_gbl_bit_register_info[register_id]); | |
315 | } | |
316 | ||
32c9ef99 BM |
317 | /****************************************************************************** |
318 | * | |
319 | * FUNCTION: acpi_hw_write_pm1_control | |
320 | * | |
321 | * PARAMETERS: pm1a_control - Value to be written to PM1A control | |
322 | * pm1b_control - Value to be written to PM1B control | |
323 | * | |
324 | * RETURN: Status | |
325 | * | |
326 | * DESCRIPTION: Write the PM1 A/B control registers. These registers are | |
327 | * different than than the PM1 A/B status and enable registers | |
328 | * in that different values can be written to the A/B registers. | |
329 | * Most notably, the SLP_TYP bits can be different, as per the | |
330 | * values returned from the _Sx predefined methods. | |
331 | * | |
332 | ******************************************************************************/ | |
333 | ||
334 | acpi_status acpi_hw_write_pm1_control(u32 pm1a_control, u32 pm1b_control) | |
335 | { | |
336 | acpi_status status; | |
337 | ||
338 | ACPI_FUNCTION_TRACE(hw_write_pm1_control); | |
339 | ||
c6b5774c BM |
340 | status = |
341 | acpi_hw_write(pm1a_control, &acpi_gbl_FADT.xpm1a_control_block); | |
32c9ef99 BM |
342 | if (ACPI_FAILURE(status)) { |
343 | return_ACPI_STATUS(status); | |
344 | } | |
345 | ||
346 | if (acpi_gbl_FADT.xpm1b_control_block.address) { | |
347 | status = | |
c6b5774c BM |
348 | acpi_hw_write(pm1b_control, |
349 | &acpi_gbl_FADT.xpm1b_control_block); | |
32c9ef99 BM |
350 | } |
351 | return_ACPI_STATUS(status); | |
352 | } | |
353 | ||
1da177e4 LT |
354 | /****************************************************************************** |
355 | * | |
356 | * FUNCTION: acpi_hw_register_read | |
357 | * | |
d30dc9ab | 358 | * PARAMETERS: register_id - ACPI Register ID |
44f6c012 | 359 | * return_value - Where the register value is returned |
1da177e4 LT |
360 | * |
361 | * RETURN: Status and the value read. | |
362 | * | |
967440e3 | 363 | * DESCRIPTION: Read from the specified ACPI register |
1da177e4 LT |
364 | * |
365 | ******************************************************************************/ | |
3e8214e5 | 366 | acpi_status acpi_hw_register_read(u32 register_id, u32 *return_value) |
1da177e4 | 367 | { |
c520abad | 368 | u32 value = 0; |
4be44fcd | 369 | acpi_status status; |
1da177e4 | 370 | |
b229cf92 | 371 | ACPI_FUNCTION_TRACE(hw_register_read); |
1da177e4 | 372 | |
1da177e4 | 373 | switch (register_id) { |
c520abad | 374 | case ACPI_REGISTER_PM1_STATUS: /* PM1 A/B: 16-bit access each */ |
1da177e4 | 375 | |
c520abad BM |
376 | status = acpi_hw_read_multiple(&value, |
377 | &acpi_gbl_xpm1a_status, | |
378 | &acpi_gbl_xpm1b_status); | |
1da177e4 LT |
379 | break; |
380 | ||
c520abad | 381 | case ACPI_REGISTER_PM1_ENABLE: /* PM1 A/B: 16-bit access each */ |
1da177e4 | 382 | |
c520abad BM |
383 | status = acpi_hw_read_multiple(&value, |
384 | &acpi_gbl_xpm1a_enable, | |
385 | &acpi_gbl_xpm1b_enable); | |
1da177e4 LT |
386 | break; |
387 | ||
c520abad | 388 | case ACPI_REGISTER_PM1_CONTROL: /* PM1 A/B: 16-bit access each */ |
1da177e4 | 389 | |
c520abad BM |
390 | status = acpi_hw_read_multiple(&value, |
391 | &acpi_gbl_FADT. | |
392 | xpm1a_control_block, | |
393 | &acpi_gbl_FADT. | |
394 | xpm1b_control_block); | |
c3dd25f4 LM |
395 | |
396 | /* | |
397 | * Zero the write-only bits. From the ACPI specification, "Hardware | |
398 | * Write-Only Bits": "Upon reads to registers with write-only bits, | |
399 | * software masks out all write-only bits." | |
400 | */ | |
401 | value &= ~ACPI_PM1_CONTROL_WRITEONLY_BITS; | |
1da177e4 LT |
402 | break; |
403 | ||
4be44fcd | 404 | case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ |
1da177e4 | 405 | |
c6b5774c BM |
406 | status = |
407 | acpi_hw_read(&value, &acpi_gbl_FADT.xpm2_control_block); | |
1da177e4 LT |
408 | break; |
409 | ||
4be44fcd | 410 | case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ |
1da177e4 | 411 | |
c6b5774c | 412 | status = acpi_hw_read(&value, &acpi_gbl_FADT.xpm_timer_block); |
1da177e4 LT |
413 | break; |
414 | ||
4be44fcd | 415 | case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ |
1da177e4 | 416 | |
f3d2e786 | 417 | status = |
7f071903 | 418 | acpi_hw_read_port(acpi_gbl_FADT.smi_command, &value, 8); |
1da177e4 LT |
419 | break; |
420 | ||
421 | default: | |
1d1ea1b7 | 422 | |
f6a22b0b | 423 | ACPI_ERROR((AE_INFO, "Unknown Register ID: 0x%X", register_id)); |
1da177e4 LT |
424 | status = AE_BAD_PARAMETER; |
425 | break; | |
426 | } | |
427 | ||
4be44fcd | 428 | if (ACPI_SUCCESS(status)) { |
c520abad | 429 | *return_value = value; |
1da177e4 LT |
430 | } |
431 | ||
4be44fcd | 432 | return_ACPI_STATUS(status); |
1da177e4 LT |
433 | } |
434 | ||
1da177e4 LT |
435 | /****************************************************************************** |
436 | * | |
437 | * FUNCTION: acpi_hw_register_write | |
438 | * | |
d30dc9ab | 439 | * PARAMETERS: register_id - ACPI Register ID |
ba494bee | 440 | * value - The value to write |
1da177e4 LT |
441 | * |
442 | * RETURN: Status | |
443 | * | |
967440e3 BM |
444 | * DESCRIPTION: Write to the specified ACPI register |
445 | * | |
446 | * NOTE: In accordance with the ACPI specification, this function automatically | |
447 | * preserves the value of the following bits, meaning that these bits cannot be | |
448 | * changed via this interface: | |
449 | * | |
450 | * PM1_CONTROL[0] = SCI_EN | |
451 | * PM1_CONTROL[9] | |
452 | * PM1_STATUS[11] | |
453 | * | |
454 | * ACPI References: | |
455 | * 1) Hardware Ignored Bits: When software writes to a register with ignored | |
456 | * bit fields, it preserves the ignored bit fields | |
457 | * 2) SCI_EN: OSPM always preserves this bit position | |
1da177e4 LT |
458 | * |
459 | ******************************************************************************/ | |
460 | ||
d30dc9ab | 461 | acpi_status acpi_hw_register_write(u32 register_id, u32 value) |
1da177e4 | 462 | { |
4be44fcd | 463 | acpi_status status; |
967440e3 | 464 | u32 read_value; |
1da177e4 | 465 | |
b229cf92 | 466 | ACPI_FUNCTION_TRACE(hw_register_write); |
1da177e4 | 467 | |
1da177e4 | 468 | switch (register_id) { |
c520abad | 469 | case ACPI_REGISTER_PM1_STATUS: /* PM1 A/B: 16-bit access each */ |
8636f8d2 BM |
470 | /* |
471 | * Handle the "ignored" bit in PM1 Status. According to the ACPI | |
472 | * specification, ignored bits are to be preserved when writing. | |
473 | * Normally, this would mean a read/modify/write sequence. However, | |
474 | * preserving a bit in the status register is different. Writing a | |
475 | * one clears the status, and writing a zero preserves the status. | |
476 | * Therefore, we must always write zero to the ignored bit. | |
477 | * | |
478 | * This behavior is clarified in the ACPI 4.0 specification. | |
479 | */ | |
480 | value &= ~ACPI_PM1_STATUS_PRESERVED_BITS; | |
967440e3 | 481 | |
c520abad BM |
482 | status = acpi_hw_write_multiple(value, |
483 | &acpi_gbl_xpm1a_status, | |
484 | &acpi_gbl_xpm1b_status); | |
1da177e4 LT |
485 | break; |
486 | ||
75c8044f | 487 | case ACPI_REGISTER_PM1_ENABLE: /* PM1 A/B: 16-bit access each */ |
1da177e4 | 488 | |
c520abad BM |
489 | status = acpi_hw_write_multiple(value, |
490 | &acpi_gbl_xpm1a_enable, | |
491 | &acpi_gbl_xpm1b_enable); | |
1da177e4 LT |
492 | break; |
493 | ||
c520abad | 494 | case ACPI_REGISTER_PM1_CONTROL: /* PM1 A/B: 16-bit access each */ |
967440e3 BM |
495 | /* |
496 | * Perform a read first to preserve certain bits (per ACPI spec) | |
c520abad | 497 | * Note: This includes SCI_EN, we never want to change this bit |
967440e3 | 498 | */ |
c520abad BM |
499 | status = acpi_hw_read_multiple(&read_value, |
500 | &acpi_gbl_FADT. | |
501 | xpm1a_control_block, | |
502 | &acpi_gbl_FADT. | |
503 | xpm1b_control_block); | |
967440e3 | 504 | if (ACPI_FAILURE(status)) { |
d30dc9ab | 505 | goto exit; |
967440e3 BM |
506 | } |
507 | ||
508 | /* Insert the bits to be preserved */ | |
509 | ||
510 | ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS, | |
511 | read_value); | |
512 | ||
513 | /* Now we can write the data */ | |
514 | ||
c520abad BM |
515 | status = acpi_hw_write_multiple(value, |
516 | &acpi_gbl_FADT. | |
517 | xpm1a_control_block, | |
518 | &acpi_gbl_FADT. | |
519 | xpm1b_control_block); | |
1da177e4 LT |
520 | break; |
521 | ||
4be44fcd | 522 | case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ |
20869dcf BM |
523 | /* |
524 | * For control registers, all reserved bits must be preserved, | |
525 | * as per the ACPI spec. | |
526 | */ | |
527 | status = | |
c6b5774c BM |
528 | acpi_hw_read(&read_value, |
529 | &acpi_gbl_FADT.xpm2_control_block); | |
20869dcf BM |
530 | if (ACPI_FAILURE(status)) { |
531 | goto exit; | |
532 | } | |
533 | ||
534 | /* Insert the bits to be preserved */ | |
535 | ||
536 | ACPI_INSERT_BITS(value, ACPI_PM2_CONTROL_PRESERVED_BITS, | |
537 | read_value); | |
538 | ||
c6b5774c BM |
539 | status = |
540 | acpi_hw_write(value, &acpi_gbl_FADT.xpm2_control_block); | |
1da177e4 LT |
541 | break; |
542 | ||
4be44fcd | 543 | case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ |
1da177e4 | 544 | |
c6b5774c | 545 | status = acpi_hw_write(value, &acpi_gbl_FADT.xpm_timer_block); |
1da177e4 LT |
546 | break; |
547 | ||
4be44fcd | 548 | case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ |
1da177e4 LT |
549 | |
550 | /* SMI_CMD is currently always in IO space */ | |
551 | ||
f3d2e786 | 552 | status = |
7f071903 | 553 | acpi_hw_write_port(acpi_gbl_FADT.smi_command, value, 8); |
1da177e4 LT |
554 | break; |
555 | ||
1da177e4 | 556 | default: |
1d1ea1b7 | 557 | |
f6a22b0b | 558 | ACPI_ERROR((AE_INFO, "Unknown Register ID: 0x%X", register_id)); |
1da177e4 LT |
559 | status = AE_BAD_PARAMETER; |
560 | break; | |
561 | } | |
562 | ||
10622bf8 | 563 | exit: |
4be44fcd | 564 | return_ACPI_STATUS(status); |
1da177e4 | 565 | } |
c520abad BM |
566 | |
567 | /****************************************************************************** | |
568 | * | |
569 | * FUNCTION: acpi_hw_read_multiple | |
570 | * | |
ba494bee | 571 | * PARAMETERS: value - Where the register value is returned |
c520abad BM |
572 | * register_a - First ACPI register (required) |
573 | * register_b - Second ACPI register (optional) | |
574 | * | |
575 | * RETURN: Status | |
576 | * | |
577 | * DESCRIPTION: Read from the specified two-part ACPI register (such as PM1 A/B) | |
578 | * | |
579 | ******************************************************************************/ | |
580 | ||
581 | static acpi_status | |
582 | acpi_hw_read_multiple(u32 *value, | |
583 | struct acpi_generic_address *register_a, | |
584 | struct acpi_generic_address *register_b) | |
585 | { | |
586 | u32 value_a = 0; | |
587 | u32 value_b = 0; | |
588 | acpi_status status; | |
589 | ||
590 | /* The first register is always required */ | |
591 | ||
c6b5774c | 592 | status = acpi_hw_read(&value_a, register_a); |
c520abad BM |
593 | if (ACPI_FAILURE(status)) { |
594 | return (status); | |
595 | } | |
596 | ||
597 | /* Second register is optional */ | |
598 | ||
599 | if (register_b->address) { | |
c6b5774c | 600 | status = acpi_hw_read(&value_b, register_b); |
c520abad BM |
601 | if (ACPI_FAILURE(status)) { |
602 | return (status); | |
603 | } | |
604 | } | |
605 | ||
aefc7f9a BM |
606 | /* |
607 | * OR the two return values together. No shifting or masking is necessary, | |
608 | * because of how the PM1 registers are defined in the ACPI specification: | |
609 | * | |
610 | * "Although the bits can be split between the two register blocks (each | |
611 | * register block has a unique pointer within the FADT), the bit positions | |
612 | * are maintained. The register block with unimplemented bits (that is, | |
613 | * those implemented in the other register block) always returns zeros, | |
614 | * and writes have no side effects" | |
615 | */ | |
616 | *value = (value_a | value_b); | |
c520abad BM |
617 | return (AE_OK); |
618 | } | |
619 | ||
620 | /****************************************************************************** | |
621 | * | |
622 | * FUNCTION: acpi_hw_write_multiple | |
623 | * | |
ba494bee | 624 | * PARAMETERS: value - The value to write |
c520abad BM |
625 | * register_a - First ACPI register (required) |
626 | * register_b - Second ACPI register (optional) | |
627 | * | |
628 | * RETURN: Status | |
629 | * | |
630 | * DESCRIPTION: Write to the specified two-part ACPI register (such as PM1 A/B) | |
631 | * | |
632 | ******************************************************************************/ | |
633 | ||
634 | static acpi_status | |
635 | acpi_hw_write_multiple(u32 value, | |
636 | struct acpi_generic_address *register_a, | |
637 | struct acpi_generic_address *register_b) | |
638 | { | |
639 | acpi_status status; | |
640 | ||
641 | /* The first register is always required */ | |
642 | ||
c6b5774c | 643 | status = acpi_hw_write(value, register_a); |
c520abad BM |
644 | if (ACPI_FAILURE(status)) { |
645 | return (status); | |
646 | } | |
647 | ||
aefc7f9a BM |
648 | /* |
649 | * Second register is optional | |
650 | * | |
651 | * No bit shifting or clearing is necessary, because of how the PM1 | |
652 | * registers are defined in the ACPI specification: | |
653 | * | |
654 | * "Although the bits can be split between the two register blocks (each | |
655 | * register block has a unique pointer within the FADT), the bit positions | |
656 | * are maintained. The register block with unimplemented bits (that is, | |
657 | * those implemented in the other register block) always returns zeros, | |
658 | * and writes have no side effects" | |
659 | */ | |
c520abad | 660 | if (register_b->address) { |
c6b5774c | 661 | status = acpi_hw_write(value, register_b); |
c520abad BM |
662 | } |
663 | ||
664 | return (status); | |
665 | } | |
33620c54 BM |
666 | |
667 | #endif /* !ACPI_REDUCED_HARDWARE */ |