Merge branch 'bjorn-initcall-cleanup' into release
[linux-2.6] / drivers / acpi / acpica / exregion.c
1
2 /******************************************************************************
3  *
4  * Module Name: exregion - ACPI default op_region (address space) handlers
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
49 #define _COMPONENT          ACPI_EXECUTER
50 ACPI_MODULE_NAME("exregion")
51
52 /*******************************************************************************
53  *
54  * FUNCTION:    acpi_ex_system_memory_space_handler
55  *
56  * PARAMETERS:  Function            - Read or Write operation
57  *              Address             - Where in the space to read or write
58  *              bit_width           - Field width in bits (8, 16, or 32)
59  *              Value               - Pointer to in or out value
60  *              handler_context     - Pointer to Handler's context
61  *              region_context      - Pointer to context specific to the
62  *                                    accessed region
63  *
64  * RETURN:      Status
65  *
66  * DESCRIPTION: Handler for the System Memory address space (Op Region)
67  *
68  ******************************************************************************/
69 acpi_status
70 acpi_ex_system_memory_space_handler(u32 function,
71                                     acpi_physical_address address,
72                                     u32 bit_width,
73                                     acpi_integer * value,
74                                     void *handler_context, void *region_context)
75 {
76         acpi_status status = AE_OK;
77         void *logical_addr_ptr = NULL;
78         struct acpi_mem_space_context *mem_info = region_context;
79         u32 length;
80         acpi_size window_size;
81 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
82         u32 remainder;
83 #endif
84
85         ACPI_FUNCTION_TRACE(ex_system_memory_space_handler);
86
87         /* Validate and translate the bit width */
88
89         switch (bit_width) {
90         case 8:
91                 length = 1;
92                 break;
93
94         case 16:
95                 length = 2;
96                 break;
97
98         case 32:
99                 length = 4;
100                 break;
101
102         case 64:
103                 length = 8;
104                 break;
105
106         default:
107                 ACPI_ERROR((AE_INFO, "Invalid SystemMemory width %d",
108                             bit_width));
109                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
110         }
111
112 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
113         /*
114          * Hardware does not support non-aligned data transfers, we must verify
115          * the request.
116          */
117         (void)acpi_ut_short_divide((acpi_integer) address, length, NULL,
118                                    &remainder);
119         if (remainder != 0) {
120                 return_ACPI_STATUS(AE_AML_ALIGNMENT);
121         }
122 #endif
123
124         /*
125          * Does the request fit into the cached memory mapping?
126          * Is 1) Address below the current mapping? OR
127          *    2) Address beyond the current mapping?
128          */
129         if ((address < mem_info->mapped_physical_address) ||
130             (((acpi_integer) address + length) > ((acpi_integer)
131                                                   mem_info->
132                                                   mapped_physical_address +
133                                                   mem_info->mapped_length))) {
134                 /*
135                  * The request cannot be resolved by the current memory mapping;
136                  * Delete the existing mapping and create a new one.
137                  */
138                 if (mem_info->mapped_length) {
139
140                         /* Valid mapping, delete it */
141
142                         acpi_os_unmap_memory(mem_info->mapped_logical_address,
143                                              mem_info->mapped_length);
144                 }
145
146                 /*
147                  * Don't attempt to map memory beyond the end of the region, and
148                  * constrain the maximum mapping size to something reasonable.
149                  */
150                 window_size = (acpi_size)
151                     ((mem_info->address + mem_info->length) - address);
152
153                 if (window_size > ACPI_SYSMEM_REGION_WINDOW_SIZE) {
154                         window_size = ACPI_SYSMEM_REGION_WINDOW_SIZE;
155                 }
156
157                 /* Create a new mapping starting at the address given */
158
159                 mem_info->mapped_logical_address =
160                         acpi_os_map_memory((acpi_physical_address) address, window_size);
161                 if (!mem_info->mapped_logical_address) {
162                         ACPI_ERROR((AE_INFO,
163                                     "Could not map memory at %8.8X%8.8X, size %X",
164                                     ACPI_FORMAT_NATIVE_UINT(address),
165                                     (u32) window_size));
166                         mem_info->mapped_length = 0;
167                         return_ACPI_STATUS(AE_NO_MEMORY);
168                 }
169
170                 /* Save the physical address and mapping size */
171
172                 mem_info->mapped_physical_address = address;
173                 mem_info->mapped_length = window_size;
174         }
175
176         /*
177          * Generate a logical pointer corresponding to the address we want to
178          * access
179          */
180         logical_addr_ptr = mem_info->mapped_logical_address +
181             ((acpi_integer) address -
182              (acpi_integer) mem_info->mapped_physical_address);
183
184         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
185                           "System-Memory (width %d) R/W %d Address=%8.8X%8.8X\n",
186                           bit_width, function,
187                           ACPI_FORMAT_NATIVE_UINT(address)));
188
189         /*
190          * Perform the memory read or write
191          *
192          * Note: For machines that do not support non-aligned transfers, the target
193          * address was checked for alignment above.  We do not attempt to break the
194          * transfer up into smaller (byte-size) chunks because the AML specifically
195          * asked for a transfer width that the hardware may require.
196          */
197         switch (function) {
198         case ACPI_READ:
199
200                 *value = 0;
201                 switch (bit_width) {
202                 case 8:
203                         *value = (acpi_integer) ACPI_GET8(logical_addr_ptr);
204                         break;
205
206                 case 16:
207                         *value = (acpi_integer) ACPI_GET16(logical_addr_ptr);
208                         break;
209
210                 case 32:
211                         *value = (acpi_integer) ACPI_GET32(logical_addr_ptr);
212                         break;
213
214                 case 64:
215                         *value = (acpi_integer) ACPI_GET64(logical_addr_ptr);
216                         break;
217
218                 default:
219                         /* bit_width was already validated */
220                         break;
221                 }
222                 break;
223
224         case ACPI_WRITE:
225
226                 switch (bit_width) {
227                 case 8:
228                         ACPI_SET8(logical_addr_ptr) = (u8) * value;
229                         break;
230
231                 case 16:
232                         ACPI_SET16(logical_addr_ptr) = (u16) * value;
233                         break;
234
235                 case 32:
236                         ACPI_SET32(logical_addr_ptr) = (u32) * value;
237                         break;
238
239                 case 64:
240                         ACPI_SET64(logical_addr_ptr) = (u64) * value;
241                         break;
242
243                 default:
244                         /* bit_width was already validated */
245                         break;
246                 }
247                 break;
248
249         default:
250                 status = AE_BAD_PARAMETER;
251                 break;
252         }
253
254         return_ACPI_STATUS(status);
255 }
256
257 /*******************************************************************************
258  *
259  * FUNCTION:    acpi_ex_system_io_space_handler
260  *
261  * PARAMETERS:  Function            - Read or Write operation
262  *              Address             - Where in the space to read or write
263  *              bit_width           - Field width in bits (8, 16, or 32)
264  *              Value               - Pointer to in or out value
265  *              handler_context     - Pointer to Handler's context
266  *              region_context      - Pointer to context specific to the
267  *                                    accessed region
268  *
269  * RETURN:      Status
270  *
271  * DESCRIPTION: Handler for the System IO address space (Op Region)
272  *
273  ******************************************************************************/
274
275 acpi_status
276 acpi_ex_system_io_space_handler(u32 function,
277                                 acpi_physical_address address,
278                                 u32 bit_width,
279                                 acpi_integer * value,
280                                 void *handler_context, void *region_context)
281 {
282         acpi_status status = AE_OK;
283         u32 value32;
284
285         ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
286
287         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
288                           "System-IO (width %d) R/W %d Address=%8.8X%8.8X\n",
289                           bit_width, function,
290                           ACPI_FORMAT_NATIVE_UINT(address)));
291
292         /* Decode the function parameter */
293
294         switch (function) {
295         case ACPI_READ:
296
297                 status = acpi_hw_read_port((acpi_io_address) address,
298                                            &value32, bit_width);
299                 *value = value32;
300                 break;
301
302         case ACPI_WRITE:
303
304                 status = acpi_hw_write_port((acpi_io_address) address,
305                                             (u32) * value, bit_width);
306                 break;
307
308         default:
309                 status = AE_BAD_PARAMETER;
310                 break;
311         }
312
313         return_ACPI_STATUS(status);
314 }
315
316 /*******************************************************************************
317  *
318  * FUNCTION:    acpi_ex_pci_config_space_handler
319  *
320  * PARAMETERS:  Function            - Read or Write operation
321  *              Address             - Where in the space to read or write
322  *              bit_width           - Field width in bits (8, 16, or 32)
323  *              Value               - Pointer to in or out value
324  *              handler_context     - Pointer to Handler's context
325  *              region_context      - Pointer to context specific to the
326  *                                    accessed region
327  *
328  * RETURN:      Status
329  *
330  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
331  *
332  ******************************************************************************/
333
334 acpi_status
335 acpi_ex_pci_config_space_handler(u32 function,
336                                  acpi_physical_address address,
337                                  u32 bit_width,
338                                  acpi_integer * value,
339                                  void *handler_context, void *region_context)
340 {
341         acpi_status status = AE_OK;
342         struct acpi_pci_id *pci_id;
343         u16 pci_register;
344         u32 value32;
345
346         ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
347
348         /*
349          *  The arguments to acpi_os(Read|Write)pci_configuration are:
350          *
351          *  pci_segment is the PCI bus segment range 0-31
352          *  pci_bus     is the PCI bus number range 0-255
353          *  pci_device  is the PCI device number range 0-31
354          *  pci_function is the PCI device function number
355          *  pci_register is the Config space register range 0-255 bytes
356          *
357          *  Value - input value for write, output address for read
358          *
359          */
360         pci_id = (struct acpi_pci_id *)region_context;
361         pci_register = (u16) (u32) address;
362
363         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
364                           "Pci-Config %d (%d) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
365                           function, bit_width, pci_id->segment, pci_id->bus,
366                           pci_id->device, pci_id->function, pci_register));
367
368         switch (function) {
369         case ACPI_READ:
370
371                 status = acpi_os_read_pci_configuration(pci_id, pci_register,
372                                                         &value32, bit_width);
373                 *value = value32;
374                 break;
375
376         case ACPI_WRITE:
377
378                 status = acpi_os_write_pci_configuration(pci_id, pci_register,
379                                                          *value, bit_width);
380                 break;
381
382         default:
383
384                 status = AE_BAD_PARAMETER;
385                 break;
386         }
387
388         return_ACPI_STATUS(status);
389 }
390
391 /*******************************************************************************
392  *
393  * FUNCTION:    acpi_ex_cmos_space_handler
394  *
395  * PARAMETERS:  Function            - Read or Write operation
396  *              Address             - Where in the space to read or write
397  *              bit_width           - Field width in bits (8, 16, or 32)
398  *              Value               - Pointer to in or out value
399  *              handler_context     - Pointer to Handler's context
400  *              region_context      - Pointer to context specific to the
401  *                                    accessed region
402  *
403  * RETURN:      Status
404  *
405  * DESCRIPTION: Handler for the CMOS address space (Op Region)
406  *
407  ******************************************************************************/
408
409 acpi_status
410 acpi_ex_cmos_space_handler(u32 function,
411                            acpi_physical_address address,
412                            u32 bit_width,
413                            acpi_integer * value,
414                            void *handler_context, void *region_context)
415 {
416         acpi_status status = AE_OK;
417
418         ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
419
420         return_ACPI_STATUS(status);
421 }
422
423 /*******************************************************************************
424  *
425  * FUNCTION:    acpi_ex_pci_bar_space_handler
426  *
427  * PARAMETERS:  Function            - Read or Write operation
428  *              Address             - Where in the space to read or write
429  *              bit_width           - Field width in bits (8, 16, or 32)
430  *              Value               - Pointer to in or out value
431  *              handler_context     - Pointer to Handler's context
432  *              region_context      - Pointer to context specific to the
433  *                                    accessed region
434  *
435  * RETURN:      Status
436  *
437  * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
438  *
439  ******************************************************************************/
440
441 acpi_status
442 acpi_ex_pci_bar_space_handler(u32 function,
443                               acpi_physical_address address,
444                               u32 bit_width,
445                               acpi_integer * value,
446                               void *handler_context, void *region_context)
447 {
448         acpi_status status = AE_OK;
449
450         ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
451
452         return_ACPI_STATUS(status);
453 }
454
455 /*******************************************************************************
456  *
457  * FUNCTION:    acpi_ex_data_table_space_handler
458  *
459  * PARAMETERS:  Function            - Read or Write operation
460  *              Address             - Where in the space to read or write
461  *              bit_width           - Field width in bits (8, 16, or 32)
462  *              Value               - Pointer to in or out value
463  *              handler_context     - Pointer to Handler's context
464  *              region_context      - Pointer to context specific to the
465  *                                    accessed region
466  *
467  * RETURN:      Status
468  *
469  * DESCRIPTION: Handler for the Data Table address space (Op Region)
470  *
471  ******************************************************************************/
472
473 acpi_status
474 acpi_ex_data_table_space_handler(u32 function,
475                                  acpi_physical_address address,
476                                  u32 bit_width,
477                                  acpi_integer * value,
478                                  void *handler_context, void *region_context)
479 {
480         ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
481
482         /* Perform the memory read or write */
483
484         switch (function) {
485         case ACPI_READ:
486
487                 ACPI_MEMCPY(ACPI_CAST_PTR(char, value),
488                             ACPI_PHYSADDR_TO_PTR(address),
489                             ACPI_DIV_8(bit_width));
490                 break;
491
492         case ACPI_WRITE:
493         default:
494
495                 return_ACPI_STATUS(AE_SUPPORT);
496         }
497
498         return_ACPI_STATUS(AE_OK);
499 }