[PATCH] libertas: sparse fixes
[linux-2.6] / 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 - 2007, 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 SystemMemory 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
139                         /* Valid mapping, delete it */
140
141                         acpi_os_unmap_memory(mem_info->mapped_logical_address,
142                                              mem_info->mapped_length);
143                 }
144
145                 /*
146                  * Don't attempt to map memory beyond the end of the region, and
147                  * constrain the maximum mapping size to something reasonable.
148                  */
149                 window_size = (acpi_size)
150                     ((mem_info->address + mem_info->length) - address);
151
152                 if (window_size > ACPI_SYSMEM_REGION_WINDOW_SIZE) {
153                         window_size = ACPI_SYSMEM_REGION_WINDOW_SIZE;
154                 }
155
156                 /* Create a new mapping starting at the address given */
157
158                 mem_info->mapped_logical_address =
159                     acpi_os_map_memory((acpi_native_uint) address, window_size);
160                 if (!mem_info->mapped_logical_address) {
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(AE_NO_MEMORY);
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 (width %d) R/W %d Address=%8.8X%8.8X\n",
185                           bit_width, function, 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                 case 64:
213                         *value = (acpi_integer) ACPI_GET64(logical_addr_ptr);
214                         break;
215
216                 default:
217                         /* bit_width was already validated */
218                         break;
219                 }
220                 break;
221
222         case ACPI_WRITE:
223
224                 switch (bit_width) {
225                 case 8:
226                         ACPI_SET8(logical_addr_ptr) = (u8) * value;
227                         break;
228
229                 case 16:
230                         ACPI_SET16(logical_addr_ptr) = (u16) * value;
231                         break;
232
233                 case 32:
234                         ACPI_SET32(logical_addr_ptr) = (u32) * value;
235                         break;
236
237                 case 64:
238                         ACPI_SET64(logical_addr_ptr) = (u64) * value;
239                         break;
240
241                 default:
242                         /* bit_width was already validated */
243                         break;
244                 }
245                 break;
246
247         default:
248                 status = AE_BAD_PARAMETER;
249                 break;
250         }
251
252         return_ACPI_STATUS(status);
253 }
254
255 /*******************************************************************************
256  *
257  * FUNCTION:    acpi_ex_system_io_space_handler
258  *
259  * PARAMETERS:  Function            - Read or Write operation
260  *              Address             - Where in the space to read or write
261  *              bit_width           - Field width in bits (8, 16, or 32)
262  *              Value               - Pointer to in or out value
263  *              handler_context     - Pointer to Handler's context
264  *              region_context      - Pointer to context specific to the
265  *                                    accessed region
266  *
267  * RETURN:      Status
268  *
269  * DESCRIPTION: Handler for the System IO address space (Op Region)
270  *
271  ******************************************************************************/
272
273 acpi_status
274 acpi_ex_system_io_space_handler(u32 function,
275                                 acpi_physical_address address,
276                                 u32 bit_width,
277                                 acpi_integer * value,
278                                 void *handler_context, void *region_context)
279 {
280         acpi_status status = AE_OK;
281         u32 value32;
282
283         ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
284
285         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
286                           "System-IO (width %d) R/W %d Address=%8.8X%8.8X\n",
287                           bit_width, function, ACPI_FORMAT_UINT64(address)));
288
289         /* Decode the function parameter */
290
291         switch (function) {
292         case ACPI_READ:
293
294                 status = acpi_os_read_port((acpi_io_address) address,
295                                            &value32, bit_width);
296                 *value = value32;
297                 break;
298
299         case ACPI_WRITE:
300
301                 status = acpi_os_write_port((acpi_io_address) address,
302                                             (u32) * value, bit_width);
303                 break;
304
305         default:
306                 status = AE_BAD_PARAMETER;
307                 break;
308         }
309
310         return_ACPI_STATUS(status);
311 }
312
313 /*******************************************************************************
314  *
315  * FUNCTION:    acpi_ex_pci_config_space_handler
316  *
317  * PARAMETERS:  Function            - Read or Write operation
318  *              Address             - Where in the space to read or write
319  *              bit_width           - Field width in bits (8, 16, or 32)
320  *              Value               - Pointer to in or out value
321  *              handler_context     - Pointer to Handler's context
322  *              region_context      - Pointer to context specific to the
323  *                                    accessed region
324  *
325  * RETURN:      Status
326  *
327  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
328  *
329  ******************************************************************************/
330
331 acpi_status
332 acpi_ex_pci_config_space_handler(u32 function,
333                                  acpi_physical_address address,
334                                  u32 bit_width,
335                                  acpi_integer * value,
336                                  void *handler_context, void *region_context)
337 {
338         acpi_status status = AE_OK;
339         struct acpi_pci_id *pci_id;
340         u16 pci_register;
341
342         ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
343
344         /*
345          *  The arguments to acpi_os(Read|Write)pci_configuration are:
346          *
347          *  pci_segment is the PCI bus segment range 0-31
348          *  pci_bus     is the PCI bus number range 0-255
349          *  pci_device  is the PCI device number range 0-31
350          *  pci_function is the PCI device function number
351          *  pci_register is the Config space register range 0-255 bytes
352          *
353          *  Value - input value for write, output address for read
354          *
355          */
356         pci_id = (struct acpi_pci_id *)region_context;
357         pci_register = (u16) (u32) address;
358
359         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
360                           "Pci-Config %d (%d) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
361                           function, bit_width, pci_id->segment, pci_id->bus,
362                           pci_id->device, pci_id->function, pci_register));
363
364         switch (function) {
365         case ACPI_READ:
366
367                 *value = 0;
368                 status = acpi_os_read_pci_configuration(pci_id, pci_register,
369                                                         value, bit_width);
370                 break;
371
372         case ACPI_WRITE:
373
374                 status = acpi_os_write_pci_configuration(pci_id, pci_register,
375                                                          *value, bit_width);
376                 break;
377
378         default:
379
380                 status = AE_BAD_PARAMETER;
381                 break;
382         }
383
384         return_ACPI_STATUS(status);
385 }
386
387 /*******************************************************************************
388  *
389  * FUNCTION:    acpi_ex_cmos_space_handler
390  *
391  * PARAMETERS:  Function            - Read or Write operation
392  *              Address             - Where in the space to read or write
393  *              bit_width           - Field width in bits (8, 16, or 32)
394  *              Value               - Pointer to in or out value
395  *              handler_context     - Pointer to Handler's context
396  *              region_context      - Pointer to context specific to the
397  *                                    accessed region
398  *
399  * RETURN:      Status
400  *
401  * DESCRIPTION: Handler for the CMOS address space (Op Region)
402  *
403  ******************************************************************************/
404
405 acpi_status
406 acpi_ex_cmos_space_handler(u32 function,
407                            acpi_physical_address address,
408                            u32 bit_width,
409                            acpi_integer * value,
410                            void *handler_context, void *region_context)
411 {
412         acpi_status status = AE_OK;
413
414         ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
415
416         return_ACPI_STATUS(status);
417 }
418
419 /*******************************************************************************
420  *
421  * FUNCTION:    acpi_ex_pci_bar_space_handler
422  *
423  * PARAMETERS:  Function            - Read or Write operation
424  *              Address             - Where in the space to read or write
425  *              bit_width           - Field width in bits (8, 16, or 32)
426  *              Value               - Pointer to in or out value
427  *              handler_context     - Pointer to Handler's context
428  *              region_context      - Pointer to context specific to the
429  *                                    accessed region
430  *
431  * RETURN:      Status
432  *
433  * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
434  *
435  ******************************************************************************/
436
437 acpi_status
438 acpi_ex_pci_bar_space_handler(u32 function,
439                               acpi_physical_address address,
440                               u32 bit_width,
441                               acpi_integer * value,
442                               void *handler_context, void *region_context)
443 {
444         acpi_status status = AE_OK;
445
446         ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
447
448         return_ACPI_STATUS(status);
449 }
450
451 /*******************************************************************************
452  *
453  * FUNCTION:    acpi_ex_data_table_space_handler
454  *
455  * PARAMETERS:  Function            - Read or Write operation
456  *              Address             - Where in the space to read or write
457  *              bit_width           - Field width in bits (8, 16, or 32)
458  *              Value               - Pointer to in or out value
459  *              handler_context     - Pointer to Handler's context
460  *              region_context      - Pointer to context specific to the
461  *                                    accessed region
462  *
463  * RETURN:      Status
464  *
465  * DESCRIPTION: Handler for the Data Table address space (Op Region)
466  *
467  ******************************************************************************/
468
469 acpi_status
470 acpi_ex_data_table_space_handler(u32 function,
471                                  acpi_physical_address address,
472                                  u32 bit_width,
473                                  acpi_integer * value,
474                                  void *handler_context, void *region_context)
475 {
476         ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
477
478         /* Perform the memory read or write */
479
480         switch (function) {
481         case ACPI_READ:
482
483                 ACPI_MEMCPY(ACPI_CAST_PTR(char, value),
484                             ACPI_PHYSADDR_TO_PTR(address),
485                             ACPI_DIV_8(bit_width));
486                 break;
487
488         case ACPI_WRITE:
489         default:
490
491                 return_ACPI_STATUS(AE_SUPPORT);
492         }
493
494         return_ACPI_STATUS(AE_OK);
495 }