Merge branch 'origin'
[pandora-kernel.git] / drivers / acpi / executer / exregion.c
1
2 /******************************************************************************
3  *
4  * Module Name: exregion - ACPI default op_region (address space) handlers
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2006, R. Byron Moore
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 <acpi/acinterp.h>
47
48 #define _COMPONENT          ACPI_EXECUTER
49 ACPI_MODULE_NAME("exregion")
50
51 /*******************************************************************************
52  *
53  * FUNCTION:    acpi_ex_system_memory_space_handler
54  *
55  * PARAMETERS:  Function            - Read or Write operation
56  *              Address             - Where in the space to read or write
57  *              bit_width           - Field width in bits (8, 16, or 32)
58  *              Value               - Pointer to in or out value
59  *              handler_context     - Pointer to Handler's context
60  *              region_context      - Pointer to context specific to the
61  *                                    accessed region
62  *
63  * RETURN:      Status
64  *
65  * DESCRIPTION: Handler for the System Memory address space (Op Region)
66  *
67  ******************************************************************************/
68 acpi_status
69 acpi_ex_system_memory_space_handler(u32 function,
70                                     acpi_physical_address address,
71                                     u32 bit_width,
72                                     acpi_integer * value,
73                                     void *handler_context, void *region_context)
74 {
75         acpi_status status = AE_OK;
76         void *logical_addr_ptr = NULL;
77         struct acpi_mem_space_context *mem_info = region_context;
78         u32 length;
79         acpi_size window_size;
80 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
81         u32 remainder;
82 #endif
83
84         ACPI_FUNCTION_TRACE("ex_system_memory_space_handler");
85
86         /* Validate and translate the bit width */
87
88         switch (bit_width) {
89         case 8:
90                 length = 1;
91                 break;
92
93         case 16:
94                 length = 2;
95                 break;
96
97         case 32:
98                 length = 4;
99                 break;
100
101         case 64:
102                 length = 8;
103                 break;
104
105         default:
106                 ACPI_ERROR((AE_INFO, "Invalid system_memory width %d",
107                             bit_width));
108                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
109         }
110
111 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
112         /*
113          * Hardware does not support non-aligned data transfers, we must verify
114          * the request.
115          */
116         (void)acpi_ut_short_divide((acpi_integer) address, length, NULL,
117                                    &remainder);
118         if (remainder != 0) {
119                 return_ACPI_STATUS(AE_AML_ALIGNMENT);
120         }
121 #endif
122
123         /*
124          * Does the request fit into the cached memory mapping?
125          * Is 1) Address below the current mapping? OR
126          *    2) Address beyond the current mapping?
127          */
128         if ((address < mem_info->mapped_physical_address) ||
129             (((acpi_integer) address + length) > ((acpi_integer)
130                                                   mem_info->
131                                                   mapped_physical_address +
132                                                   mem_info->mapped_length))) {
133                 /*
134                  * The request cannot be resolved by the current memory mapping;
135                  * Delete the existing mapping and create a new one.
136                  */
137                 if (mem_info->mapped_length) {
138                         /* Valid mapping, delete it */
139
140                         acpi_os_unmap_memory(mem_info->mapped_logical_address,
141                                              mem_info->mapped_length);
142                 }
143
144                 /*
145                  * Don't attempt to map memory beyond the end of the region, and
146                  * constrain the maximum mapping size to something reasonable.
147                  */
148                 window_size = (acpi_size)
149                     ((mem_info->address + mem_info->length) - address);
150
151                 if (window_size > ACPI_SYSMEM_REGION_WINDOW_SIZE) {
152                         window_size = ACPI_SYSMEM_REGION_WINDOW_SIZE;
153                 }
154
155                 /* Create a new mapping starting at the address given */
156
157                 status = acpi_os_map_memory(address, window_size,
158                                             (void **)&mem_info->
159                                             mapped_logical_address);
160                 if (ACPI_FAILURE(status)) {
161                         ACPI_ERROR((AE_INFO,
162                                     "Could not map memory at %8.8X%8.8X, size %X",
163                                     ACPI_FORMAT_UINT64(address),
164                                     (u32) window_size));
165                         mem_info->mapped_length = 0;
166                         return_ACPI_STATUS(status);
167                 }
168
169                 /* Save the physical address and mapping size */
170
171                 mem_info->mapped_physical_address = address;
172                 mem_info->mapped_length = window_size;
173         }
174
175         /*
176          * Generate a logical pointer corresponding to the address we want to
177          * access
178          */
179         logical_addr_ptr = mem_info->mapped_logical_address +
180             ((acpi_integer) address -
181              (acpi_integer) mem_info->mapped_physical_address);
182
183         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
184                           "system_memory %d (%d width) Address=%8.8X%8.8X\n",
185                           function, bit_width, ACPI_FORMAT_UINT64(address)));
186
187         /*
188          * Perform the memory read or write
189          *
190          * Note: For machines that do not support non-aligned transfers, the target
191          * address was checked for alignment above.  We do not attempt to break the
192          * transfer up into smaller (byte-size) chunks because the AML specifically
193          * asked for a transfer width that the hardware may require.
194          */
195         switch (function) {
196         case ACPI_READ:
197
198                 *value = 0;
199                 switch (bit_width) {
200                 case 8:
201                         *value = (acpi_integer) ACPI_GET8(logical_addr_ptr);
202                         break;
203
204                 case 16:
205                         *value = (acpi_integer) ACPI_GET16(logical_addr_ptr);
206                         break;
207
208                 case 32:
209                         *value = (acpi_integer) ACPI_GET32(logical_addr_ptr);
210                         break;
211
212 #if ACPI_MACHINE_WIDTH != 16
213                 case 64:
214                         *value = (acpi_integer) ACPI_GET64(logical_addr_ptr);
215                         break;
216 #endif
217                 default:
218                         /* bit_width was already validated */
219                         break;
220                 }
221                 break;
222
223         case ACPI_WRITE:
224
225                 switch (bit_width) {
226                 case 8:
227                         ACPI_SET8(logical_addr_ptr) = (u8) * value;
228                         break;
229
230                 case 16:
231                         ACPI_SET16(logical_addr_ptr) = (u16) * value;
232                         break;
233
234                 case 32:
235                         ACPI_SET32(logical_addr_ptr) = (u32) * value;
236                         break;
237
238 #if ACPI_MACHINE_WIDTH != 16
239                 case 64:
240                         ACPI_SET64(logical_addr_ptr) = (u64) * value;
241                         break;
242 #endif
243
244                 default:
245                         /* bit_width was already validated */
246                         break;
247                 }
248                 break;
249
250         default:
251                 status = AE_BAD_PARAMETER;
252                 break;
253         }
254
255         return_ACPI_STATUS(status);
256 }
257
258 /*******************************************************************************
259  *
260  * FUNCTION:    acpi_ex_system_io_space_handler
261  *
262  * PARAMETERS:  Function            - Read or Write operation
263  *              Address             - Where in the space to read or write
264  *              bit_width           - Field width in bits (8, 16, or 32)
265  *              Value               - Pointer to in or out value
266  *              handler_context     - Pointer to Handler's context
267  *              region_context      - Pointer to context specific to the
268  *                                    accessed region
269  *
270  * RETURN:      Status
271  *
272  * DESCRIPTION: Handler for the System IO address space (Op Region)
273  *
274  ******************************************************************************/
275
276 acpi_status
277 acpi_ex_system_io_space_handler(u32 function,
278                                 acpi_physical_address address,
279                                 u32 bit_width,
280                                 acpi_integer * value,
281                                 void *handler_context, void *region_context)
282 {
283         acpi_status status = AE_OK;
284         u32 value32;
285
286         ACPI_FUNCTION_TRACE("ex_system_io_space_handler");
287
288         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
289                           "system_iO %d (%d width) Address=%8.8X%8.8X\n",
290                           function, bit_width, ACPI_FORMAT_UINT64(address)));
291
292         /* Decode the function parameter */
293
294         switch (function) {
295         case ACPI_READ:
296
297                 status = acpi_os_read_port((acpi_io_address) address,
298                                            &value32, bit_width);
299                 *value = value32;
300                 break;
301
302         case ACPI_WRITE:
303
304                 status = acpi_os_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
345         ACPI_FUNCTION_TRACE("ex_pci_config_space_handler");
346
347         /*
348          *  The arguments to acpi_os(Read|Write)pci_configuration are:
349          *
350          *  pci_segment is the PCI bus segment range 0-31
351          *  pci_bus     is the PCI bus number range 0-255
352          *  pci_device  is the PCI device number range 0-31
353          *  pci_function is the PCI device function number
354          *  pci_register is the Config space register range 0-255 bytes
355          *
356          *  Value - input value for write, output address for read
357          *
358          */
359         pci_id = (struct acpi_pci_id *)region_context;
360         pci_register = (u16) (u32) address;
361
362         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
363                           "pci_config %d (%d) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
364                           function, bit_width, pci_id->segment, pci_id->bus,
365                           pci_id->device, pci_id->function, pci_register));
366
367         switch (function) {
368         case ACPI_READ:
369
370                 *value = 0;
371                 status = acpi_os_read_pci_configuration(pci_id, pci_register,
372                                                         value, bit_width);
373                 break;
374
375         case ACPI_WRITE:
376
377                 status = acpi_os_write_pci_configuration(pci_id, pci_register,
378                                                          *value, bit_width);
379                 break;
380
381         default:
382
383                 status = AE_BAD_PARAMETER;
384                 break;
385         }
386
387         return_ACPI_STATUS(status);
388 }
389
390 /*******************************************************************************
391  *
392  * FUNCTION:    acpi_ex_cmos_space_handler
393  *
394  * PARAMETERS:  Function            - Read or Write operation
395  *              Address             - Where in the space to read or write
396  *              bit_width           - Field width in bits (8, 16, or 32)
397  *              Value               - Pointer to in or out value
398  *              handler_context     - Pointer to Handler's context
399  *              region_context      - Pointer to context specific to the
400  *                                    accessed region
401  *
402  * RETURN:      Status
403  *
404  * DESCRIPTION: Handler for the CMOS address space (Op Region)
405  *
406  ******************************************************************************/
407
408 acpi_status
409 acpi_ex_cmos_space_handler(u32 function,
410                            acpi_physical_address address,
411                            u32 bit_width,
412                            acpi_integer * value,
413                            void *handler_context, void *region_context)
414 {
415         acpi_status status = AE_OK;
416
417         ACPI_FUNCTION_TRACE("ex_cmos_space_handler");
418
419         return_ACPI_STATUS(status);
420 }
421
422 /*******************************************************************************
423  *
424  * FUNCTION:    acpi_ex_pci_bar_space_handler
425  *
426  * PARAMETERS:  Function            - Read or Write operation
427  *              Address             - Where in the space to read or write
428  *              bit_width           - Field width in bits (8, 16, or 32)
429  *              Value               - Pointer to in or out value
430  *              handler_context     - Pointer to Handler's context
431  *              region_context      - Pointer to context specific to the
432  *                                    accessed region
433  *
434  * RETURN:      Status
435  *
436  * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
437  *
438  ******************************************************************************/
439
440 acpi_status
441 acpi_ex_pci_bar_space_handler(u32 function,
442                               acpi_physical_address address,
443                               u32 bit_width,
444                               acpi_integer * value,
445                               void *handler_context, void *region_context)
446 {
447         acpi_status status = AE_OK;
448
449         ACPI_FUNCTION_TRACE("ex_pci_bar_space_handler");
450
451         return_ACPI_STATUS(status);
452 }
453
454 /*******************************************************************************
455  *
456  * FUNCTION:    acpi_ex_data_table_space_handler
457  *
458  * PARAMETERS:  Function            - Read or Write operation
459  *              Address             - Where in the space to read or write
460  *              bit_width           - Field width in bits (8, 16, or 32)
461  *              Value               - Pointer to in or out value
462  *              handler_context     - Pointer to Handler's context
463  *              region_context      - Pointer to context specific to the
464  *                                    accessed region
465  *
466  * RETURN:      Status
467  *
468  * DESCRIPTION: Handler for the Data Table address space (Op Region)
469  *
470  ******************************************************************************/
471
472 acpi_status
473 acpi_ex_data_table_space_handler(u32 function,
474                                  acpi_physical_address address,
475                                  u32 bit_width,
476                                  acpi_integer * value,
477                                  void *handler_context, void *region_context)
478 {
479         acpi_status status = AE_OK;
480         u32 byte_width = ACPI_DIV_8(bit_width);
481         u32 i;
482         char *logical_addr_ptr;
483
484         ACPI_FUNCTION_TRACE("ex_data_table_space_handler");
485
486         logical_addr_ptr = ACPI_PHYSADDR_TO_PTR(address);
487
488         /* Perform the memory read or write */
489
490         switch (function) {
491         case ACPI_READ:
492
493                 for (i = 0; i < byte_width; i++) {
494                         ((char *)value)[i] = logical_addr_ptr[i];
495                 }
496                 break;
497
498         case ACPI_WRITE:
499         default:
500
501                 return_ACPI_STATUS(AE_SUPPORT);
502         }
503
504         return_ACPI_STATUS(status);
505 }