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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: exfield - AML execution - field_unit read/write
5 *
6 * Copyright (C) 2000 - 2020, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12#include "acdispat.h"
13#include "acinterp.h"
14#include "amlcode.h"
15
16#define _COMPONENT ACPI_EXECUTER
17ACPI_MODULE_NAME("exfield")
18
19/*
20 * This table maps the various Attrib protocols to the byte transfer
21 * length. Used for the generic serial bus.
22 */
23#define ACPI_INVALID_PROTOCOL_ID 0x80
24#define ACPI_MAX_PROTOCOL_ID 0x0F
25static const u8 acpi_protocol_lengths[] = {
26 ACPI_INVALID_PROTOCOL_ID, /* 0 - reserved */
27 ACPI_INVALID_PROTOCOL_ID, /* 1 - reserved */
28 0x00, /* 2 - ATTRIB_QUICK */
29 ACPI_INVALID_PROTOCOL_ID, /* 3 - reserved */
30 0x01, /* 4 - ATTRIB_SEND_RECEIVE */
31 ACPI_INVALID_PROTOCOL_ID, /* 5 - reserved */
32 0x01, /* 6 - ATTRIB_BYTE */
33 ACPI_INVALID_PROTOCOL_ID, /* 7 - reserved */
34 0x02, /* 8 - ATTRIB_WORD */
35 ACPI_INVALID_PROTOCOL_ID, /* 9 - reserved */
36 0xFF, /* A - ATTRIB_BLOCK */
37 0xFF, /* B - ATTRIB_BYTES */
38 0x02, /* C - ATTRIB_PROCESS_CALL */
39 0xFF, /* D - ATTRIB_BLOCK_PROCESS_CALL */
40 0xFF, /* E - ATTRIB_RAW_BYTES */
41 0xFF /* F - ATTRIB_RAW_PROCESS_BYTES */
42};
43
44#define PCC_MASTER_SUBSPACE 3
45
46/*
47 * The following macros determine a given offset is a COMD field.
48 * According to the specification, generic subspaces (types 0-2) contains a
49 * 2-byte COMD field at offset 4 and master subspaces (type 3) contains a 4-byte
50 * COMD field starting at offset 12.
51 */
52#define GENERIC_SUBSPACE_COMMAND(a) (4 == a || a == 5)
53#define MASTER_SUBSPACE_COMMAND(a) (12 <= a && a <= 15)
54
55/*******************************************************************************
56 *
57 * FUNCTION: acpi_ex_get_protocol_buffer_length
58 *
59 * PARAMETERS: protocol_id - The type of the protocol indicated by region
60 * field access attributes
61 * return_length - Where the protocol byte transfer length is
62 * returned
63 *
64 * RETURN: Status and decoded byte transfer length
65 *
66 * DESCRIPTION: This routine returns the length of the generic_serial_bus
67 * protocol bytes
68 *
69 ******************************************************************************/
70
71acpi_status
72acpi_ex_get_protocol_buffer_length(u32 protocol_id, u32 *return_length)
73{
74
75 if ((protocol_id > ACPI_MAX_PROTOCOL_ID) ||
76 (acpi_protocol_lengths[protocol_id] == ACPI_INVALID_PROTOCOL_ID)) {
77 ACPI_ERROR((AE_INFO,
78 "Invalid Field/AccessAs protocol ID: 0x%4.4X",
79 protocol_id));
80
81 return (AE_AML_PROTOCOL);
82 }
83
84 *return_length = acpi_protocol_lengths[protocol_id];
85 return (AE_OK);
86}
87
88/*******************************************************************************
89 *
90 * FUNCTION: acpi_ex_read_data_from_field
91 *
92 * PARAMETERS: walk_state - Current execution state
93 * obj_desc - The named field
94 * ret_buffer_desc - Where the return data object is stored
95 *
96 * RETURN: Status
97 *
98 * DESCRIPTION: Read from a named field. Returns either an Integer or a
99 * Buffer, depending on the size of the field and whether if a
100 * field is created by the create_field() operator.
101 *
102 ******************************************************************************/
103
104acpi_status
105acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
106 union acpi_operand_object *obj_desc,
107 union acpi_operand_object **ret_buffer_desc)
108{
109 acpi_status status;
110 union acpi_operand_object *buffer_desc;
111 void *buffer;
112 u32 buffer_length;
113
114 ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
115
116 /* Parameter validation */
117
118 if (!obj_desc) {
119 return_ACPI_STATUS(AE_AML_NO_OPERAND);
120 }
121 if (!ret_buffer_desc) {
122 return_ACPI_STATUS(AE_BAD_PARAMETER);
123 }
124
125 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
126 /*
127 * If the buffer_field arguments have not been previously evaluated,
128 * evaluate them now and save the results.
129 */
130 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
131 status = acpi_ds_get_buffer_field_arguments(obj_desc);
132 if (ACPI_FAILURE(status)) {
133 return_ACPI_STATUS(status);
134 }
135 }
136 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
137 (obj_desc->field.region_obj->region.space_id ==
138 ACPI_ADR_SPACE_SMBUS
139 || obj_desc->field.region_obj->region.space_id ==
140 ACPI_ADR_SPACE_GSBUS
141 || obj_desc->field.region_obj->region.space_id ==
142 ACPI_ADR_SPACE_IPMI)) {
143
144 /* SMBus, GSBus, IPMI serial */
145
146 status = acpi_ex_read_serial_bus(obj_desc, ret_buffer_desc);
147 return_ACPI_STATUS(status);
148 }
149
150 /*
151 * Allocate a buffer for the contents of the field.
152 *
153 * If the field is larger than the current integer width, create
154 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
155 * the use of arithmetic operators on the returned value if the
156 * field size is equal or smaller than an Integer.
157 *
158 * However, all buffer fields created by create_field operator needs to
159 * remain as a buffer to match other AML interpreter implementations.
160 *
161 * Note: Field.length is in bits.
162 */
163 buffer_length =
164 (acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
165
166 if (buffer_length > acpi_gbl_integer_byte_width ||
167 (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD &&
168 obj_desc->buffer_field.is_create_field)) {
169
170 /* Field is too large for an Integer, create a Buffer instead */
171
172 buffer_desc = acpi_ut_create_buffer_object(buffer_length);
173 if (!buffer_desc) {
174 return_ACPI_STATUS(AE_NO_MEMORY);
175 }
176 buffer = buffer_desc->buffer.pointer;
177 } else {
178 /* Field will fit within an Integer (normal case) */
179
180 buffer_desc = acpi_ut_create_integer_object((u64) 0);
181 if (!buffer_desc) {
182 return_ACPI_STATUS(AE_NO_MEMORY);
183 }
184
185 buffer_length = acpi_gbl_integer_byte_width;
186 buffer = &buffer_desc->integer.value;
187 }
188
189 if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
190 (obj_desc->field.region_obj->region.space_id ==
191 ACPI_ADR_SPACE_GPIO)) {
192
193 /* General Purpose I/O */
194
195 status = acpi_ex_read_gpio(obj_desc, buffer);
196 goto exit;
197 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
198 (obj_desc->field.region_obj->region.space_id ==
199 ACPI_ADR_SPACE_PLATFORM_COMM)) {
200 /*
201 * Reading from a PCC field unit does not require the handler because
202 * it only requires reading from the internal_pcc_buffer.
203 */
204 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
205 "PCC FieldRead bits %u\n",
206 obj_desc->field.bit_length));
207
208 memcpy(buffer,
209 obj_desc->field.region_obj->field.internal_pcc_buffer +
210 obj_desc->field.base_byte_offset,
211 (acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.
212 bit_length));
213
214 *ret_buffer_desc = buffer_desc;
215 return AE_OK;
216 }
217
218 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
219 "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
220 obj_desc, obj_desc->common.type, buffer,
221 buffer_length));
222 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
223 "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
224 obj_desc->common_field.bit_length,
225 obj_desc->common_field.start_field_bit_offset,
226 obj_desc->common_field.base_byte_offset));
227
228 /* Lock entire transaction if requested */
229
230 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
231
232 /* Read from the field */
233
234 status = acpi_ex_extract_from_field(obj_desc, buffer, buffer_length);
235 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
236
237exit:
238 if (ACPI_FAILURE(status)) {
239 acpi_ut_remove_reference(buffer_desc);
240 } else {
241 *ret_buffer_desc = buffer_desc;
242 }
243
244 return_ACPI_STATUS(status);
245}
246
247/*******************************************************************************
248 *
249 * FUNCTION: acpi_ex_write_data_to_field
250 *
251 * PARAMETERS: source_desc - Contains data to write
252 * obj_desc - The named field
253 * result_desc - Where the return value is returned, if any
254 *
255 * RETURN: Status
256 *
257 * DESCRIPTION: Write to a named field
258 *
259 ******************************************************************************/
260
261acpi_status
262acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
263 union acpi_operand_object *obj_desc,
264 union acpi_operand_object **result_desc)
265{
266 acpi_status status;
267 u32 buffer_length;
268 u32 data_length;
269 void *buffer;
270
271 ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
272
273 /* Parameter validation */
274
275 if (!source_desc || !obj_desc) {
276 return_ACPI_STATUS(AE_AML_NO_OPERAND);
277 }
278
279 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
280 /*
281 * If the buffer_field arguments have not been previously evaluated,
282 * evaluate them now and save the results.
283 */
284 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
285 status = acpi_ds_get_buffer_field_arguments(obj_desc);
286 if (ACPI_FAILURE(status)) {
287 return_ACPI_STATUS(status);
288 }
289 }
290 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
291 (obj_desc->field.region_obj->region.space_id ==
292 ACPI_ADR_SPACE_GPIO)) {
293
294 /* General Purpose I/O */
295
296 status = acpi_ex_write_gpio(source_desc, obj_desc, result_desc);
297 return_ACPI_STATUS(status);
298 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
299 (obj_desc->field.region_obj->region.space_id ==
300 ACPI_ADR_SPACE_SMBUS
301 || obj_desc->field.region_obj->region.space_id ==
302 ACPI_ADR_SPACE_GSBUS
303 || obj_desc->field.region_obj->region.space_id ==
304 ACPI_ADR_SPACE_IPMI)) {
305
306 /* SMBus, GSBus, IPMI serial */
307
308 status =
309 acpi_ex_write_serial_bus(source_desc, obj_desc,
310 result_desc);
311 return_ACPI_STATUS(status);
312 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
313 (obj_desc->field.region_obj->region.space_id ==
314 ACPI_ADR_SPACE_PLATFORM_COMM)) {
315 /*
316 * According to the spec a write to the COMD field will invoke the
317 * region handler. Otherwise, write to the pcc_internal buffer. This
318 * implementation will use the offsets specified rather than the name
319 * of the field. This is considered safer because some firmware tools
320 * are known to obfiscate named objects.
321 */
322 data_length =
323 (acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.
324 bit_length);
325 memcpy(obj_desc->field.region_obj->field.internal_pcc_buffer +
326 obj_desc->field.base_byte_offset,
327 source_desc->buffer.pointer, data_length);
328
329 if ((obj_desc->field.region_obj->region.address ==
330 PCC_MASTER_SUBSPACE
331 && MASTER_SUBSPACE_COMMAND(obj_desc->field.
332 base_byte_offset))
333 || GENERIC_SUBSPACE_COMMAND(obj_desc->field.
334 base_byte_offset)) {
335
336 /* Perform the write */
337
338 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
339 "PCC COMD field has been written. Invoking PCC handler now.\n"));
340
341 status =
342 acpi_ex_access_region(obj_desc, 0,
343 (u64 *)obj_desc->field.
344 region_obj->field.
345 internal_pcc_buffer,
346 ACPI_WRITE);
347 return_ACPI_STATUS(status);
348 }
349 return (AE_OK);
350 }
351
352 /* Get a pointer to the data to be written */
353
354 switch (source_desc->common.type) {
355 case ACPI_TYPE_INTEGER:
356
357 buffer = &source_desc->integer.value;
358 buffer_length = sizeof(source_desc->integer.value);
359 break;
360
361 case ACPI_TYPE_BUFFER:
362
363 buffer = source_desc->buffer.pointer;
364 buffer_length = source_desc->buffer.length;
365 break;
366
367 case ACPI_TYPE_STRING:
368
369 buffer = source_desc->string.pointer;
370 buffer_length = source_desc->string.length;
371 break;
372
373 default:
374 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
375 }
376
377 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
378 "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
379 source_desc,
380 acpi_ut_get_type_name(source_desc->common.type),
381 source_desc->common.type, buffer, buffer_length));
382
383 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
384 "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
385 obj_desc,
386 acpi_ut_get_type_name(obj_desc->common.type),
387 obj_desc->common.type,
388 obj_desc->common_field.bit_length,
389 obj_desc->common_field.start_field_bit_offset,
390 obj_desc->common_field.base_byte_offset));
391
392 /* Lock entire transaction if requested */
393
394 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
395
396 /* Write to the field */
397
398 status = acpi_ex_insert_into_field(obj_desc, buffer, buffer_length);
399 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
400 return_ACPI_STATUS(status);
401}
1/******************************************************************************
2 *
3 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2012, 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 "acdispat.h"
47#include "acinterp.h"
48
49#define _COMPONENT ACPI_EXECUTER
50ACPI_MODULE_NAME("exfield")
51
52/*******************************************************************************
53 *
54 * FUNCTION: acpi_ex_read_data_from_field
55 *
56 * PARAMETERS: walk_state - Current execution state
57 * obj_desc - The named field
58 * ret_buffer_desc - Where the return data object is stored
59 *
60 * RETURN: Status
61 *
62 * DESCRIPTION: Read from a named field. Returns either an Integer or a
63 * Buffer, depending on the size of the field.
64 *
65 ******************************************************************************/
66acpi_status
67acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
68 union acpi_operand_object *obj_desc,
69 union acpi_operand_object **ret_buffer_desc)
70{
71 acpi_status status;
72 union acpi_operand_object *buffer_desc;
73 acpi_size length;
74 void *buffer;
75 u32 function;
76
77 ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
78
79 /* Parameter validation */
80
81 if (!obj_desc) {
82 return_ACPI_STATUS(AE_AML_NO_OPERAND);
83 }
84 if (!ret_buffer_desc) {
85 return_ACPI_STATUS(AE_BAD_PARAMETER);
86 }
87
88 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
89 /*
90 * If the buffer_field arguments have not been previously evaluated,
91 * evaluate them now and save the results.
92 */
93 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
94 status = acpi_ds_get_buffer_field_arguments(obj_desc);
95 if (ACPI_FAILURE(status)) {
96 return_ACPI_STATUS(status);
97 }
98 }
99 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
100 (obj_desc->field.region_obj->region.space_id ==
101 ACPI_ADR_SPACE_SMBUS
102 || obj_desc->field.region_obj->region.space_id ==
103 ACPI_ADR_SPACE_GSBUS
104 || obj_desc->field.region_obj->region.space_id ==
105 ACPI_ADR_SPACE_IPMI)) {
106 /*
107 * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
108 * the data and then directly access the region handler.
109 *
110 * Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
111 */
112 if (obj_desc->field.region_obj->region.space_id ==
113 ACPI_ADR_SPACE_SMBUS) {
114 length = ACPI_SMBUS_BUFFER_SIZE;
115 function =
116 ACPI_READ | (obj_desc->field.attribute << 16);
117 } else if (obj_desc->field.region_obj->region.space_id ==
118 ACPI_ADR_SPACE_GSBUS) {
119 length = ACPI_GSBUS_BUFFER_SIZE;
120 function =
121 ACPI_READ | (obj_desc->field.attribute << 16);
122 } else { /* IPMI */
123
124 length = ACPI_IPMI_BUFFER_SIZE;
125 function = ACPI_READ;
126 }
127
128 buffer_desc = acpi_ut_create_buffer_object(length);
129 if (!buffer_desc) {
130 return_ACPI_STATUS(AE_NO_MEMORY);
131 }
132
133 /* Lock entire transaction if requested */
134
135 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
136
137 /* Call the region handler for the read */
138
139 status = acpi_ex_access_region(obj_desc, 0,
140 ACPI_CAST_PTR(u64,
141 buffer_desc->
142 buffer.pointer),
143 function);
144 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
145 goto exit;
146 }
147
148 /*
149 * Allocate a buffer for the contents of the field.
150 *
151 * If the field is larger than the current integer width, create
152 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
153 * the use of arithmetic operators on the returned value if the
154 * field size is equal or smaller than an Integer.
155 *
156 * Note: Field.length is in bits.
157 */
158 length =
159 (acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
160 if (length > acpi_gbl_integer_byte_width) {
161
162 /* Field is too large for an Integer, create a Buffer instead */
163
164 buffer_desc = acpi_ut_create_buffer_object(length);
165 if (!buffer_desc) {
166 return_ACPI_STATUS(AE_NO_MEMORY);
167 }
168 buffer = buffer_desc->buffer.pointer;
169 } else {
170 /* Field will fit within an Integer (normal case) */
171
172 buffer_desc = acpi_ut_create_integer_object((u64) 0);
173 if (!buffer_desc) {
174 return_ACPI_STATUS(AE_NO_MEMORY);
175 }
176
177 length = acpi_gbl_integer_byte_width;
178 buffer = &buffer_desc->integer.value;
179 }
180
181 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
182 "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
183 obj_desc, obj_desc->common.type, buffer,
184 (u32) length));
185 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
186 "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
187 obj_desc->common_field.bit_length,
188 obj_desc->common_field.start_field_bit_offset,
189 obj_desc->common_field.base_byte_offset));
190
191 /* Lock entire transaction if requested */
192
193 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
194
195 /* Read from the field */
196
197 status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
198 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
199
200 exit:
201 if (ACPI_FAILURE(status)) {
202 acpi_ut_remove_reference(buffer_desc);
203 } else {
204 *ret_buffer_desc = buffer_desc;
205 }
206
207 return_ACPI_STATUS(status);
208}
209
210/*******************************************************************************
211 *
212 * FUNCTION: acpi_ex_write_data_to_field
213 *
214 * PARAMETERS: source_desc - Contains data to write
215 * obj_desc - The named field
216 * result_desc - Where the return value is returned, if any
217 *
218 * RETURN: Status
219 *
220 * DESCRIPTION: Write to a named field
221 *
222 ******************************************************************************/
223
224acpi_status
225acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
226 union acpi_operand_object *obj_desc,
227 union acpi_operand_object **result_desc)
228{
229 acpi_status status;
230 u32 length;
231 void *buffer;
232 union acpi_operand_object *buffer_desc;
233 u32 function;
234
235 ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
236
237 /* Parameter validation */
238
239 if (!source_desc || !obj_desc) {
240 return_ACPI_STATUS(AE_AML_NO_OPERAND);
241 }
242
243 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
244 /*
245 * If the buffer_field arguments have not been previously evaluated,
246 * evaluate them now and save the results.
247 */
248 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
249 status = acpi_ds_get_buffer_field_arguments(obj_desc);
250 if (ACPI_FAILURE(status)) {
251 return_ACPI_STATUS(status);
252 }
253 }
254 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
255 (obj_desc->field.region_obj->region.space_id ==
256 ACPI_ADR_SPACE_SMBUS
257 || obj_desc->field.region_obj->region.space_id ==
258 ACPI_ADR_SPACE_GSBUS
259 || obj_desc->field.region_obj->region.space_id ==
260 ACPI_ADR_SPACE_IPMI)) {
261 /*
262 * This is an SMBus, GSBus or IPMI write. We will bypass the entire field
263 * mechanism and handoff the buffer directly to the handler. For
264 * these address spaces, the buffer is bi-directional; on a write,
265 * return data is returned in the same buffer.
266 *
267 * Source must be a buffer of sufficient size:
268 * ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
269 *
270 * Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
271 */
272 if (source_desc->common.type != ACPI_TYPE_BUFFER) {
273 ACPI_ERROR((AE_INFO,
274 "SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s",
275 acpi_ut_get_object_type_name(source_desc)));
276
277 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
278 }
279
280 if (obj_desc->field.region_obj->region.space_id ==
281 ACPI_ADR_SPACE_SMBUS) {
282 length = ACPI_SMBUS_BUFFER_SIZE;
283 function =
284 ACPI_WRITE | (obj_desc->field.attribute << 16);
285 } else if (obj_desc->field.region_obj->region.space_id ==
286 ACPI_ADR_SPACE_GSBUS) {
287 length = ACPI_GSBUS_BUFFER_SIZE;
288 function =
289 ACPI_WRITE | (obj_desc->field.attribute << 16);
290 } else { /* IPMI */
291
292 length = ACPI_IPMI_BUFFER_SIZE;
293 function = ACPI_WRITE;
294 }
295
296 if (source_desc->buffer.length < length) {
297 ACPI_ERROR((AE_INFO,
298 "SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u",
299 length, source_desc->buffer.length));
300
301 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
302 }
303
304 /* Create the bi-directional buffer */
305
306 buffer_desc = acpi_ut_create_buffer_object(length);
307 if (!buffer_desc) {
308 return_ACPI_STATUS(AE_NO_MEMORY);
309 }
310
311 buffer = buffer_desc->buffer.pointer;
312 ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);
313
314 /* Lock entire transaction if requested */
315
316 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
317
318 /*
319 * Perform the write (returns status and perhaps data in the
320 * same buffer)
321 */
322 status = acpi_ex_access_region(obj_desc, 0,
323 (u64 *) buffer, function);
324 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
325
326 *result_desc = buffer_desc;
327 return_ACPI_STATUS(status);
328 }
329
330 /* Get a pointer to the data to be written */
331
332 switch (source_desc->common.type) {
333 case ACPI_TYPE_INTEGER:
334 buffer = &source_desc->integer.value;
335 length = sizeof(source_desc->integer.value);
336 break;
337
338 case ACPI_TYPE_BUFFER:
339 buffer = source_desc->buffer.pointer;
340 length = source_desc->buffer.length;
341 break;
342
343 case ACPI_TYPE_STRING:
344 buffer = source_desc->string.pointer;
345 length = source_desc->string.length;
346 break;
347
348 default:
349 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
350 }
351
352 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
353 "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
354 source_desc,
355 acpi_ut_get_type_name(source_desc->common.type),
356 source_desc->common.type, buffer, length));
357
358 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
359 "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
360 obj_desc,
361 acpi_ut_get_type_name(obj_desc->common.type),
362 obj_desc->common.type,
363 obj_desc->common_field.bit_length,
364 obj_desc->common_field.start_field_bit_offset,
365 obj_desc->common_field.base_byte_offset));
366
367 /* Lock entire transaction if requested */
368
369 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
370
371 /* Write to the field */
372
373 status = acpi_ex_insert_into_field(obj_desc, buffer, length);
374 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
375
376 return_ACPI_STATUS(status);
377}