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e3a59b4d HR |
1 | /* |
2 | * ide-acpi.c | |
3 | * Provides ACPI support for IDE drives. | |
4 | * | |
5 | * Copyright (C) 2005 Intel Corp. | |
6 | * Copyright (C) 2005 Randy Dunlap | |
7 | * Copyright (C) 2006 SUSE Linux Products GmbH | |
8 | * Copyright (C) 2006 Hannes Reinecke | |
9 | */ | |
10 | ||
11 | #include <linux/ata.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <acpi/acpi.h> | |
17 | #include <linux/ide.h> | |
18 | #include <linux/pci.h> | |
19 | ||
20 | #include <acpi/acpi_bus.h> | |
21 | #include <acpi/acnames.h> | |
22 | #include <acpi/acnamesp.h> | |
23 | #include <acpi/acparser.h> | |
24 | #include <acpi/acexcep.h> | |
25 | #include <acpi/acmacros.h> | |
26 | #include <acpi/actypes.h> | |
27 | ||
28 | #define REGS_PER_GTF 7 | |
29 | struct taskfile_array { | |
30 | u8 tfa[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */ | |
31 | }; | |
32 | ||
33 | struct GTM_buffer { | |
34 | u32 PIO_speed0; | |
35 | u32 DMA_speed0; | |
36 | u32 PIO_speed1; | |
37 | u32 DMA_speed1; | |
38 | u32 GTM_flags; | |
39 | }; | |
40 | ||
41 | struct ide_acpi_drive_link { | |
42 | ide_drive_t *drive; | |
43 | acpi_handle obj_handle; | |
44 | u8 idbuff[512]; | |
45 | }; | |
46 | ||
47 | struct ide_acpi_hwif_link { | |
48 | ide_hwif_t *hwif; | |
49 | acpi_handle obj_handle; | |
50 | struct GTM_buffer gtm; | |
51 | struct ide_acpi_drive_link master; | |
52 | struct ide_acpi_drive_link slave; | |
53 | }; | |
54 | ||
55 | #undef DEBUGGING | |
56 | /* note: adds function name and KERN_DEBUG */ | |
57 | #ifdef DEBUGGING | |
58 | #define DEBPRINT(fmt, args...) \ | |
59 | printk(KERN_DEBUG "%s: " fmt, __FUNCTION__, ## args) | |
60 | #else | |
61 | #define DEBPRINT(fmt, args...) do {} while (0) | |
62 | #endif /* DEBUGGING */ | |
63 | ||
64 | extern int ide_noacpi; | |
65 | extern int ide_noacpitfs; | |
66 | extern int ide_noacpionboot; | |
67 | ||
68 | /** | |
69 | * ide_get_dev_handle - finds acpi_handle and PCI device.function | |
70 | * @dev: device to locate | |
71 | * @handle: returned acpi_handle for @dev | |
72 | * @pcidevfn: return PCI device.func for @dev | |
73 | * | |
74 | * Returns the ACPI object handle to the corresponding PCI device. | |
75 | * | |
76 | * Returns 0 on success, <0 on error. | |
77 | */ | |
78 | static int ide_get_dev_handle(struct device *dev, acpi_handle *handle, | |
79 | acpi_integer *pcidevfn) | |
80 | { | |
81 | struct pci_dev *pdev = to_pci_dev(dev); | |
82 | unsigned int bus, devnum, func; | |
83 | acpi_integer addr; | |
84 | acpi_handle dev_handle; | |
85 | struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER, | |
86 | .pointer = NULL}; | |
87 | acpi_status status; | |
88 | struct acpi_device_info *dinfo = NULL; | |
89 | int ret = -ENODEV; | |
90 | ||
91 | bus = pdev->bus->number; | |
92 | devnum = PCI_SLOT(pdev->devfn); | |
93 | func = PCI_FUNC(pdev->devfn); | |
94 | /* ACPI _ADR encoding for PCI bus: */ | |
95 | addr = (acpi_integer)(devnum << 16 | func); | |
96 | ||
97 | DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func); | |
98 | ||
99 | dev_handle = DEVICE_ACPI_HANDLE(dev); | |
100 | if (!dev_handle) { | |
101 | DEBPRINT("no acpi handle for device\n"); | |
102 | goto err; | |
103 | } | |
104 | ||
105 | status = acpi_get_object_info(dev_handle, &buffer); | |
106 | if (ACPI_FAILURE(status)) { | |
107 | DEBPRINT("get_object_info for device failed\n"); | |
108 | goto err; | |
109 | } | |
110 | dinfo = buffer.pointer; | |
111 | if (dinfo && (dinfo->valid & ACPI_VALID_ADR) && | |
112 | dinfo->address == addr) { | |
113 | *pcidevfn = addr; | |
114 | *handle = dev_handle; | |
115 | } else { | |
116 | DEBPRINT("get_object_info for device has wrong " | |
117 | " address: %llu, should be %u\n", | |
118 | dinfo ? (unsigned long long)dinfo->address : -1ULL, | |
119 | (unsigned int)addr); | |
120 | goto err; | |
121 | } | |
122 | ||
123 | DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n", | |
124 | devnum, func, (unsigned long long)addr, *handle); | |
125 | ret = 0; | |
126 | err: | |
127 | kfree(dinfo); | |
128 | return ret; | |
129 | } | |
130 | ||
131 | /** | |
132 | * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif | |
133 | * @hwif: device to locate | |
134 | * | |
135 | * Retrieves the object handle for a given hwif. | |
136 | * | |
137 | * Returns handle on success, 0 on error. | |
138 | */ | |
139 | static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif) | |
140 | { | |
141 | struct device *dev = hwif->gendev.parent; | |
142 | acpi_handle dev_handle; | |
143 | acpi_integer pcidevfn; | |
144 | acpi_handle chan_handle; | |
145 | int err; | |
146 | ||
147 | DEBPRINT("ENTER: device %s\n", hwif->name); | |
148 | ||
149 | if (!dev) { | |
150 | DEBPRINT("no PCI device for %s\n", hwif->name); | |
151 | return NULL; | |
152 | } | |
153 | ||
154 | err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn); | |
155 | if (err < 0) { | |
156 | DEBPRINT("ide_get_dev_handle failed (%d)\n", err); | |
157 | return NULL; | |
158 | } | |
159 | ||
160 | /* get child objects of dev_handle == channel objects, | |
161 | * + _their_ children == drive objects */ | |
162 | /* channel is hwif->channel */ | |
163 | chan_handle = acpi_get_child(dev_handle, hwif->channel); | |
164 | DEBPRINT("chan adr=%d: handle=0x%p\n", | |
165 | hwif->channel, chan_handle); | |
166 | ||
167 | return chan_handle; | |
168 | } | |
169 | ||
170 | /** | |
171 | * ide_acpi_drive_get_handle - Get ACPI object handle for a given drive | |
172 | * @drive: device to locate | |
173 | * | |
174 | * Retrieves the object handle of a given drive. According to the ACPI | |
175 | * spec the drive is a child of the hwif. | |
176 | * | |
177 | * Returns handle on success, 0 on error. | |
178 | */ | |
179 | static acpi_handle ide_acpi_drive_get_handle(ide_drive_t *drive) | |
180 | { | |
181 | ide_hwif_t *hwif = HWIF(drive); | |
182 | int port; | |
183 | acpi_handle drive_handle; | |
184 | ||
185 | if (!hwif->acpidata) | |
186 | return NULL; | |
187 | ||
188 | if (!hwif->acpidata->obj_handle) | |
189 | return NULL; | |
190 | ||
191 | port = hwif->channel ? drive->dn - 2: drive->dn; | |
192 | ||
193 | DEBPRINT("ENTER: %s at channel#: %d port#: %d\n", | |
194 | drive->name, hwif->channel, port); | |
195 | ||
196 | ||
197 | /* TBD: could also check ACPI object VALID bits */ | |
198 | drive_handle = acpi_get_child(hwif->acpidata->obj_handle, port); | |
199 | DEBPRINT("drive %s handle 0x%p\n", drive->name, drive_handle); | |
200 | ||
201 | return drive_handle; | |
202 | } | |
203 | ||
204 | /** | |
205 | * do_drive_get_GTF - get the drive bootup default taskfile settings | |
206 | * @drive: the drive for which the taskfile settings should be retrieved | |
207 | * @gtf_length: number of bytes of _GTF data returned at @gtf_address | |
208 | * @gtf_address: buffer containing _GTF taskfile arrays | |
209 | * | |
210 | * The _GTF method has no input parameters. | |
211 | * It returns a variable number of register set values (registers | |
212 | * hex 1F1..1F7, taskfiles). | |
213 | * The <variable number> is not known in advance, so have ACPI-CA | |
214 | * allocate the buffer as needed and return it, then free it later. | |
215 | * | |
216 | * The returned @gtf_length and @gtf_address are only valid if the | |
217 | * function return value is 0. | |
218 | */ | |
219 | static int do_drive_get_GTF(ide_drive_t *drive, | |
220 | unsigned int *gtf_length, unsigned long *gtf_address, | |
221 | unsigned long *obj_loc) | |
222 | { | |
223 | acpi_status status; | |
224 | struct acpi_buffer output; | |
225 | union acpi_object *out_obj; | |
226 | ide_hwif_t *hwif = HWIF(drive); | |
227 | struct device *dev = hwif->gendev.parent; | |
228 | int err = -ENODEV; | |
229 | int port; | |
230 | ||
231 | *gtf_length = 0; | |
232 | *gtf_address = 0UL; | |
233 | *obj_loc = 0UL; | |
234 | ||
235 | if (ide_noacpi) | |
236 | return 0; | |
237 | ||
238 | if (!dev) { | |
239 | DEBPRINT("no PCI device for %s\n", hwif->name); | |
240 | goto out; | |
241 | } | |
242 | ||
243 | if (!hwif->acpidata) { | |
244 | DEBPRINT("no ACPI data for %s\n", hwif->name); | |
245 | goto out; | |
246 | } | |
247 | ||
248 | port = hwif->channel ? drive->dn - 2: drive->dn; | |
249 | ||
250 | if (!drive->acpidata) { | |
251 | if (port == 0) { | |
252 | drive->acpidata = &hwif->acpidata->master; | |
253 | hwif->acpidata->master.drive = drive; | |
254 | } else { | |
255 | drive->acpidata = &hwif->acpidata->slave; | |
256 | hwif->acpidata->slave.drive = drive; | |
257 | } | |
258 | } | |
259 | ||
260 | DEBPRINT("ENTER: %s at %s, port#: %d, hard_port#: %d\n", | |
261 | hwif->name, dev->bus_id, port, hwif->channel); | |
262 | ||
263 | if (!drive->present) { | |
264 | DEBPRINT("%s drive %d:%d not present\n", | |
265 | hwif->name, hwif->channel, port); | |
266 | goto out; | |
267 | } | |
268 | ||
269 | /* Get this drive's _ADR info. if not already known. */ | |
270 | if (!drive->acpidata->obj_handle) { | |
271 | drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive); | |
272 | if (!drive->acpidata->obj_handle) { | |
273 | DEBPRINT("No ACPI object found for %s\n", | |
274 | drive->name); | |
275 | goto out; | |
276 | } | |
277 | } | |
278 | ||
279 | /* Setting up output buffer */ | |
280 | output.length = ACPI_ALLOCATE_BUFFER; | |
281 | output.pointer = NULL; /* ACPI-CA sets this; save/free it later */ | |
282 | ||
283 | /* _GTF has no input parameters */ | |
284 | err = -EIO; | |
285 | status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF", | |
286 | NULL, &output); | |
287 | if (ACPI_FAILURE(status)) { | |
288 | printk(KERN_DEBUG | |
289 | "%s: Run _GTF error: status = 0x%x\n", | |
290 | __FUNCTION__, status); | |
291 | goto out; | |
292 | } | |
293 | ||
294 | if (!output.length || !output.pointer) { | |
295 | DEBPRINT("Run _GTF: " | |
296 | "length or ptr is NULL (0x%llx, 0x%p)\n", | |
297 | (unsigned long long)output.length, | |
298 | output.pointer); | |
299 | goto out; | |
300 | } | |
301 | ||
302 | out_obj = output.pointer; | |
303 | if (out_obj->type != ACPI_TYPE_BUFFER) { | |
304 | DEBPRINT("Run _GTF: error: " | |
305 | "expected object type of ACPI_TYPE_BUFFER, " | |
306 | "got 0x%x\n", out_obj->type); | |
307 | err = -ENOENT; | |
308 | kfree(output.pointer); | |
309 | goto out; | |
310 | } | |
311 | ||
312 | if (!out_obj->buffer.length || !out_obj->buffer.pointer || | |
313 | out_obj->buffer.length % REGS_PER_GTF) { | |
314 | printk(KERN_ERR | |
315 | "%s: unexpected GTF length (%d) or addr (0x%p)\n", | |
316 | __FUNCTION__, out_obj->buffer.length, | |
317 | out_obj->buffer.pointer); | |
318 | err = -ENOENT; | |
319 | kfree(output.pointer); | |
320 | goto out; | |
321 | } | |
322 | ||
323 | *gtf_length = out_obj->buffer.length; | |
324 | *gtf_address = (unsigned long)out_obj->buffer.pointer; | |
325 | *obj_loc = (unsigned long)out_obj; | |
326 | DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n", | |
327 | *gtf_length, *gtf_address, *obj_loc); | |
328 | err = 0; | |
329 | out: | |
330 | return err; | |
331 | } | |
332 | ||
333 | /** | |
334 | * taskfile_load_raw - send taskfile registers to drive | |
335 | * @drive: drive to which output is sent | |
336 | * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7) | |
337 | * | |
338 | * Outputs IDE taskfile to the drive. | |
339 | */ | |
340 | static int taskfile_load_raw(ide_drive_t *drive, | |
341 | const struct taskfile_array *gtf) | |
342 | { | |
343 | ide_task_t args; | |
344 | int err = 0; | |
345 | ||
346 | DEBPRINT("(0x1f1-1f7): hex: " | |
347 | "%02x %02x %02x %02x %02x %02x %02x\n", | |
348 | gtf->tfa[0], gtf->tfa[1], gtf->tfa[2], | |
349 | gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]); | |
350 | ||
351 | memset(&args, 0, sizeof(ide_task_t)); | |
352 | args.command_type = IDE_DRIVE_TASK_NO_DATA; | |
353 | args.data_phase = TASKFILE_IN; | |
354 | args.handler = &task_no_data_intr; | |
355 | ||
356 | /* convert gtf to IDE Taskfile */ | |
357 | args.tfRegister[1] = gtf->tfa[0]; /* 0x1f1 */ | |
358 | args.tfRegister[2] = gtf->tfa[1]; /* 0x1f2 */ | |
359 | args.tfRegister[3] = gtf->tfa[2]; /* 0x1f3 */ | |
360 | args.tfRegister[4] = gtf->tfa[3]; /* 0x1f4 */ | |
361 | args.tfRegister[5] = gtf->tfa[4]; /* 0x1f5 */ | |
362 | args.tfRegister[6] = gtf->tfa[5]; /* 0x1f6 */ | |
363 | args.tfRegister[7] = gtf->tfa[6]; /* 0x1f7 */ | |
364 | ||
365 | if (ide_noacpitfs) { | |
366 | DEBPRINT("_GTF execution disabled\n"); | |
367 | return err; | |
368 | } | |
369 | ||
370 | err = ide_raw_taskfile(drive, &args, NULL); | |
371 | if (err) | |
372 | printk(KERN_ERR "%s: ide_raw_taskfile failed: %u\n", | |
373 | __FUNCTION__, err); | |
374 | ||
375 | return err; | |
376 | } | |
377 | ||
378 | /** | |
379 | * do_drive_set_taskfiles - write the drive taskfile settings from _GTF | |
380 | * @drive: the drive to which the taskfile command should be sent | |
381 | * @gtf_length: total number of bytes of _GTF taskfiles | |
382 | * @gtf_address: location of _GTF taskfile arrays | |
383 | * | |
384 | * Write {gtf_address, length gtf_length} in groups of | |
385 | * REGS_PER_GTF bytes. | |
386 | */ | |
387 | static int do_drive_set_taskfiles(ide_drive_t *drive, | |
388 | unsigned int gtf_length, | |
389 | unsigned long gtf_address) | |
390 | { | |
391 | int rc = -ENODEV, err; | |
392 | int gtf_count = gtf_length / REGS_PER_GTF; | |
393 | int ix; | |
394 | struct taskfile_array *gtf; | |
395 | ||
396 | if (ide_noacpi) | |
397 | return 0; | |
398 | ||
399 | DEBPRINT("ENTER: %s, hard_port#: %d\n", drive->name, drive->dn); | |
400 | ||
401 | if (!drive->present) | |
402 | goto out; | |
403 | if (!gtf_count) /* shouldn't be here */ | |
404 | goto out; | |
405 | ||
406 | DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n", | |
407 | gtf_length, gtf_length, gtf_count, gtf_address); | |
408 | ||
409 | if (gtf_length % REGS_PER_GTF) { | |
410 | printk(KERN_ERR "%s: unexpected GTF length (%d)\n", | |
411 | __FUNCTION__, gtf_length); | |
412 | goto out; | |
413 | } | |
414 | ||
415 | rc = 0; | |
416 | for (ix = 0; ix < gtf_count; ix++) { | |
417 | gtf = (struct taskfile_array *) | |
418 | (gtf_address + ix * REGS_PER_GTF); | |
419 | ||
420 | /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */ | |
421 | err = taskfile_load_raw(drive, gtf); | |
422 | if (err) | |
423 | rc = err; | |
424 | } | |
425 | ||
426 | out: | |
427 | return rc; | |
428 | } | |
429 | ||
430 | /** | |
431 | * ide_acpi_exec_tfs - get then write drive taskfile settings | |
432 | * @drive: the drive for which the taskfile settings should be | |
433 | * written. | |
434 | * | |
435 | * According to the ACPI spec this should be called after _STM | |
436 | * has been evaluated for the interface. Some ACPI vendors interpret | |
437 | * that as a hard requirement and modify the taskfile according | |
438 | * to the Identify Drive information passed down with _STM. | |
439 | * So one should really make sure to call this only after _STM has | |
440 | * been executed. | |
441 | */ | |
442 | int ide_acpi_exec_tfs(ide_drive_t *drive) | |
443 | { | |
444 | int ret; | |
445 | unsigned int gtf_length; | |
446 | unsigned long gtf_address; | |
447 | unsigned long obj_loc; | |
448 | ||
449 | if (ide_noacpi) | |
450 | return 0; | |
451 | ||
452 | DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn); | |
453 | ||
454 | ret = do_drive_get_GTF(drive, >f_length, >f_address, &obj_loc); | |
455 | if (ret < 0) { | |
456 | DEBPRINT("get_GTF error (%d)\n", ret); | |
457 | return ret; | |
458 | } | |
459 | ||
460 | DEBPRINT("call set_taskfiles, drive=%s\n", drive->name); | |
461 | ||
462 | ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address); | |
463 | kfree((void *)obj_loc); | |
464 | if (ret < 0) { | |
465 | DEBPRINT("set_taskfiles error (%d)\n", ret); | |
466 | } | |
467 | ||
468 | DEBPRINT("ret=%d\n", ret); | |
469 | ||
470 | return ret; | |
471 | } | |
472 | EXPORT_SYMBOL_GPL(ide_acpi_exec_tfs); | |
473 | ||
474 | /** | |
475 | * ide_acpi_get_timing - get the channel (controller) timings | |
476 | * @hwif: target IDE interface (channel) | |
477 | * | |
478 | * This function executes the _GTM ACPI method for the target channel. | |
479 | * | |
480 | */ | |
481 | void ide_acpi_get_timing(ide_hwif_t *hwif) | |
482 | { | |
483 | acpi_status status; | |
484 | struct acpi_buffer output; | |
485 | union acpi_object *out_obj; | |
486 | ||
487 | if (ide_noacpi) | |
488 | return; | |
489 | ||
490 | DEBPRINT("ENTER:\n"); | |
491 | ||
492 | if (!hwif->acpidata) { | |
493 | DEBPRINT("no ACPI data for %s\n", hwif->name); | |
494 | return; | |
495 | } | |
496 | ||
497 | /* Setting up output buffer for _GTM */ | |
498 | output.length = ACPI_ALLOCATE_BUFFER; | |
499 | output.pointer = NULL; /* ACPI-CA sets this; save/free it later */ | |
500 | ||
501 | /* _GTM has no input parameters */ | |
502 | status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM", | |
503 | NULL, &output); | |
504 | ||
505 | DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n", | |
506 | status, output.pointer, | |
507 | (unsigned long long)output.length); | |
508 | ||
509 | if (ACPI_FAILURE(status)) { | |
510 | DEBPRINT("Run _GTM error: status = 0x%x\n", status); | |
511 | return; | |
512 | } | |
513 | ||
514 | if (!output.length || !output.pointer) { | |
515 | DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n", | |
516 | (unsigned long long)output.length, | |
517 | output.pointer); | |
518 | kfree(output.pointer); | |
519 | return; | |
520 | } | |
521 | ||
522 | out_obj = output.pointer; | |
523 | if (out_obj->type != ACPI_TYPE_BUFFER) { | |
524 | kfree(output.pointer); | |
525 | DEBPRINT("Run _GTM: error: " | |
526 | "expected object type of ACPI_TYPE_BUFFER, " | |
527 | "got 0x%x\n", out_obj->type); | |
528 | return; | |
529 | } | |
530 | ||
531 | if (!out_obj->buffer.length || !out_obj->buffer.pointer || | |
532 | out_obj->buffer.length != sizeof(struct GTM_buffer)) { | |
533 | kfree(output.pointer); | |
534 | printk(KERN_ERR | |
1e8f34f7 AM |
535 | "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or " |
536 | "addr (0x%p)\n", | |
537 | __FUNCTION__, out_obj->buffer.length, | |
538 | sizeof(struct GTM_buffer), out_obj->buffer.pointer); | |
e3a59b4d HR |
539 | return; |
540 | } | |
541 | ||
542 | memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer, | |
543 | sizeof(struct GTM_buffer)); | |
544 | ||
545 | DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n", | |
546 | out_obj->buffer.pointer, out_obj->buffer.length, | |
547 | sizeof(struct GTM_buffer)); | |
548 | ||
549 | DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", | |
550 | hwif->acpidata->gtm.PIO_speed0, | |
551 | hwif->acpidata->gtm.DMA_speed0, | |
552 | hwif->acpidata->gtm.PIO_speed1, | |
553 | hwif->acpidata->gtm.DMA_speed1, | |
554 | hwif->acpidata->gtm.GTM_flags); | |
555 | ||
556 | kfree(output.pointer); | |
557 | } | |
558 | EXPORT_SYMBOL_GPL(ide_acpi_get_timing); | |
559 | ||
560 | /** | |
561 | * ide_acpi_push_timing - set the channel (controller) timings | |
562 | * @hwif: target IDE interface (channel) | |
563 | * | |
564 | * This function executes the _STM ACPI method for the target channel. | |
565 | * | |
566 | * _STM requires Identify Drive data, which has to passed as an argument. | |
567 | * Unfortunately hd_driveid is a mangled version which we can't readily | |
568 | * use; hence we'll get the information afresh. | |
569 | */ | |
570 | void ide_acpi_push_timing(ide_hwif_t *hwif) | |
571 | { | |
572 | acpi_status status; | |
573 | struct acpi_object_list input; | |
574 | union acpi_object in_params[3]; | |
575 | struct ide_acpi_drive_link *master = &hwif->acpidata->master; | |
576 | struct ide_acpi_drive_link *slave = &hwif->acpidata->slave; | |
577 | ||
578 | if (ide_noacpi) | |
579 | return; | |
580 | ||
581 | DEBPRINT("ENTER:\n"); | |
582 | ||
583 | if (!hwif->acpidata) { | |
584 | DEBPRINT("no ACPI data for %s\n", hwif->name); | |
585 | return; | |
586 | } | |
587 | ||
588 | /* Give the GTM buffer + drive Identify data to the channel via the | |
589 | * _STM method: */ | |
590 | /* setup input parameters buffer for _STM */ | |
591 | input.count = 3; | |
592 | input.pointer = in_params; | |
593 | in_params[0].type = ACPI_TYPE_BUFFER; | |
594 | in_params[0].buffer.length = sizeof(struct GTM_buffer); | |
595 | in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm; | |
596 | in_params[1].type = ACPI_TYPE_BUFFER; | |
597 | in_params[1].buffer.length = sizeof(struct hd_driveid); | |
598 | in_params[1].buffer.pointer = (u8 *)&master->idbuff; | |
599 | in_params[2].type = ACPI_TYPE_BUFFER; | |
600 | in_params[2].buffer.length = sizeof(struct hd_driveid); | |
601 | in_params[2].buffer.pointer = (u8 *)&slave->idbuff; | |
602 | /* Output buffer: _STM has no output */ | |
603 | ||
604 | status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM", | |
605 | &input, NULL); | |
606 | ||
607 | if (ACPI_FAILURE(status)) { | |
608 | DEBPRINT("Run _STM error: status = 0x%x\n", status); | |
609 | } | |
610 | DEBPRINT("_STM status: %d\n", status); | |
611 | } | |
612 | EXPORT_SYMBOL_GPL(ide_acpi_push_timing); | |
613 | ||
614 | /** | |
615 | * ide_acpi_init - initialize the ACPI link for an IDE interface | |
616 | * @hwif: target IDE interface (channel) | |
617 | * | |
618 | * The ACPI spec is not quite clear when the drive identify buffer | |
619 | * should be obtained. Calling IDENTIFY DEVICE during shutdown | |
620 | * is not the best of ideas as the drive might already being put to | |
621 | * sleep. And obviously we can't call it during resume. | |
622 | * So we get the information during startup; but this means that | |
623 | * any changes during run-time will be lost after resume. | |
624 | */ | |
625 | void ide_acpi_init(ide_hwif_t *hwif) | |
626 | { | |
627 | int unit; | |
628 | int err; | |
629 | struct ide_acpi_drive_link *master; | |
630 | struct ide_acpi_drive_link *slave; | |
631 | ||
632 | hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL); | |
633 | if (!hwif->acpidata) | |
634 | return; | |
635 | ||
636 | hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif); | |
637 | if (!hwif->acpidata->obj_handle) { | |
638 | DEBPRINT("no ACPI object for %s found\n", hwif->name); | |
639 | kfree(hwif->acpidata); | |
640 | hwif->acpidata = NULL; | |
641 | return; | |
642 | } | |
643 | ||
644 | /* | |
645 | * The ACPI spec mandates that we send information | |
646 | * for both drives, regardless whether they are connected | |
647 | * or not. | |
648 | */ | |
649 | hwif->acpidata->master.drive = &hwif->drives[0]; | |
650 | hwif->drives[0].acpidata = &hwif->acpidata->master; | |
651 | master = &hwif->acpidata->master; | |
652 | ||
653 | hwif->acpidata->slave.drive = &hwif->drives[1]; | |
654 | hwif->drives[1].acpidata = &hwif->acpidata->slave; | |
655 | slave = &hwif->acpidata->slave; | |
656 | ||
657 | ||
658 | /* | |
659 | * Send IDENTIFY for each drive | |
660 | */ | |
661 | if (master->drive->present) { | |
662 | err = taskfile_lib_get_identify(master->drive, master->idbuff); | |
663 | if (err) { | |
664 | DEBPRINT("identify device %s failed (%d)\n", | |
665 | master->drive->name, err); | |
666 | } | |
667 | } | |
668 | ||
669 | if (slave->drive->present) { | |
670 | err = taskfile_lib_get_identify(slave->drive, slave->idbuff); | |
671 | if (err) { | |
672 | DEBPRINT("identify device %s failed (%d)\n", | |
673 | slave->drive->name, err); | |
674 | } | |
675 | } | |
676 | ||
677 | if (ide_noacpionboot) { | |
678 | DEBPRINT("ACPI methods disabled on boot\n"); | |
679 | return; | |
680 | } | |
681 | ||
682 | /* | |
683 | * ACPI requires us to call _STM on startup | |
684 | */ | |
685 | ide_acpi_get_timing(hwif); | |
686 | ide_acpi_push_timing(hwif); | |
687 | ||
688 | for (unit = 0; unit < MAX_DRIVES; ++unit) { | |
689 | ide_drive_t *drive = &hwif->drives[unit]; | |
690 | ||
691 | if (drive->present) { | |
692 | /* Execute ACPI startup code */ | |
693 | ide_acpi_exec_tfs(drive); | |
694 | } | |
695 | } | |
696 | } | |
697 | EXPORT_SYMBOL_GPL(ide_acpi_init); |