blob: e888fc35b27ce55401827d7255d064a7670ff02f [file] [log] [blame]
Hannes Reineckee3a59b42007-02-07 18:19:37 +01001/*
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>
Shaohua Li90494892008-01-10 23:03:42 +010019#include <linux/dmi.h>
Hannes Reineckee3a59b42007-02-07 18:19:37 +010020
21#include <acpi/acpi_bus.h>
22#include <acpi/acnames.h>
23#include <acpi/acnamesp.h>
24#include <acpi/acparser.h>
25#include <acpi/acexcep.h>
26#include <acpi/acmacros.h>
27#include <acpi/actypes.h>
28
29#define REGS_PER_GTF 7
30struct taskfile_array {
31 u8 tfa[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
32};
33
34struct GTM_buffer {
35 u32 PIO_speed0;
36 u32 DMA_speed0;
37 u32 PIO_speed1;
38 u32 DMA_speed1;
39 u32 GTM_flags;
40};
41
42struct ide_acpi_drive_link {
43 ide_drive_t *drive;
44 acpi_handle obj_handle;
45 u8 idbuff[512];
46};
47
48struct ide_acpi_hwif_link {
49 ide_hwif_t *hwif;
50 acpi_handle obj_handle;
51 struct GTM_buffer gtm;
52 struct ide_acpi_drive_link master;
53 struct ide_acpi_drive_link slave;
54};
55
56#undef DEBUGGING
57/* note: adds function name and KERN_DEBUG */
58#ifdef DEBUGGING
59#define DEBPRINT(fmt, args...) \
60 printk(KERN_DEBUG "%s: " fmt, __FUNCTION__, ## args)
61#else
62#define DEBPRINT(fmt, args...) do {} while (0)
63#endif /* DEBUGGING */
64
65extern int ide_noacpi;
66extern int ide_noacpitfs;
67extern int ide_noacpionboot;
68
Shaohua Li90494892008-01-10 23:03:42 +010069static bool ide_noacpi_psx;
70static int no_acpi_psx(const struct dmi_system_id *id)
71{
72 ide_noacpi_psx = true;
73 printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident);
74 return 0;
75}
76
77static const struct dmi_system_id ide_acpi_dmi_table[] = {
78 /* Bug 9673. */
79 /* We should check if this is because ACPI NVS isn't save/restored. */
80 {
81 .callback = no_acpi_psx,
82 .ident = "HP nx9005",
83 .matches = {
84 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."),
85 DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60")
86 },
87 },
Jeff Garzik7c48c562008-01-10 23:59:18 -050088
89 { } /* terminate list */
Shaohua Li90494892008-01-10 23:03:42 +010090};
91
92static int ide_acpi_blacklist(void)
93{
94 static int done;
95 if (done)
96 return 0;
97 done = 1;
98 dmi_check_system(ide_acpi_dmi_table);
99 return 0;
100}
101
Hannes Reineckee3a59b42007-02-07 18:19:37 +0100102/**
103 * ide_get_dev_handle - finds acpi_handle and PCI device.function
104 * @dev: device to locate
105 * @handle: returned acpi_handle for @dev
106 * @pcidevfn: return PCI device.func for @dev
107 *
108 * Returns the ACPI object handle to the corresponding PCI device.
109 *
110 * Returns 0 on success, <0 on error.
111 */
112static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
113 acpi_integer *pcidevfn)
114{
115 struct pci_dev *pdev = to_pci_dev(dev);
116 unsigned int bus, devnum, func;
117 acpi_integer addr;
118 acpi_handle dev_handle;
119 struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
120 .pointer = NULL};
121 acpi_status status;
122 struct acpi_device_info *dinfo = NULL;
123 int ret = -ENODEV;
124
125 bus = pdev->bus->number;
126 devnum = PCI_SLOT(pdev->devfn);
127 func = PCI_FUNC(pdev->devfn);
128 /* ACPI _ADR encoding for PCI bus: */
129 addr = (acpi_integer)(devnum << 16 | func);
130
131 DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func);
132
133 dev_handle = DEVICE_ACPI_HANDLE(dev);
134 if (!dev_handle) {
135 DEBPRINT("no acpi handle for device\n");
136 goto err;
137 }
138
139 status = acpi_get_object_info(dev_handle, &buffer);
140 if (ACPI_FAILURE(status)) {
141 DEBPRINT("get_object_info for device failed\n");
142 goto err;
143 }
144 dinfo = buffer.pointer;
145 if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
146 dinfo->address == addr) {
147 *pcidevfn = addr;
148 *handle = dev_handle;
149 } else {
150 DEBPRINT("get_object_info for device has wrong "
151 " address: %llu, should be %u\n",
152 dinfo ? (unsigned long long)dinfo->address : -1ULL,
153 (unsigned int)addr);
154 goto err;
155 }
156
157 DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n",
158 devnum, func, (unsigned long long)addr, *handle);
159 ret = 0;
160err:
161 kfree(dinfo);
162 return ret;
163}
164
165/**
166 * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif
167 * @hwif: device to locate
168 *
169 * Retrieves the object handle for a given hwif.
170 *
171 * Returns handle on success, 0 on error.
172 */
173static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif)
174{
175 struct device *dev = hwif->gendev.parent;
176 acpi_handle dev_handle;
177 acpi_integer pcidevfn;
178 acpi_handle chan_handle;
179 int err;
180
181 DEBPRINT("ENTER: device %s\n", hwif->name);
182
183 if (!dev) {
184 DEBPRINT("no PCI device for %s\n", hwif->name);
185 return NULL;
186 }
187
188 err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn);
189 if (err < 0) {
190 DEBPRINT("ide_get_dev_handle failed (%d)\n", err);
191 return NULL;
192 }
193
194 /* get child objects of dev_handle == channel objects,
195 * + _their_ children == drive objects */
196 /* channel is hwif->channel */
197 chan_handle = acpi_get_child(dev_handle, hwif->channel);
198 DEBPRINT("chan adr=%d: handle=0x%p\n",
199 hwif->channel, chan_handle);
200
201 return chan_handle;
202}
203
204/**
205 * ide_acpi_drive_get_handle - Get ACPI object handle for a given drive
206 * @drive: device to locate
207 *
208 * Retrieves the object handle of a given drive. According to the ACPI
209 * spec the drive is a child of the hwif.
210 *
211 * Returns handle on success, 0 on error.
212 */
213static acpi_handle ide_acpi_drive_get_handle(ide_drive_t *drive)
214{
215 ide_hwif_t *hwif = HWIF(drive);
216 int port;
217 acpi_handle drive_handle;
218
219 if (!hwif->acpidata)
220 return NULL;
221
222 if (!hwif->acpidata->obj_handle)
223 return NULL;
224
225 port = hwif->channel ? drive->dn - 2: drive->dn;
226
227 DEBPRINT("ENTER: %s at channel#: %d port#: %d\n",
228 drive->name, hwif->channel, port);
229
230
231 /* TBD: could also check ACPI object VALID bits */
232 drive_handle = acpi_get_child(hwif->acpidata->obj_handle, port);
233 DEBPRINT("drive %s handle 0x%p\n", drive->name, drive_handle);
234
235 return drive_handle;
236}
237
238/**
239 * do_drive_get_GTF - get the drive bootup default taskfile settings
240 * @drive: the drive for which the taskfile settings should be retrieved
241 * @gtf_length: number of bytes of _GTF data returned at @gtf_address
242 * @gtf_address: buffer containing _GTF taskfile arrays
243 *
244 * The _GTF method has no input parameters.
245 * It returns a variable number of register set values (registers
246 * hex 1F1..1F7, taskfiles).
247 * The <variable number> is not known in advance, so have ACPI-CA
248 * allocate the buffer as needed and return it, then free it later.
249 *
250 * The returned @gtf_length and @gtf_address are only valid if the
251 * function return value is 0.
252 */
253static int do_drive_get_GTF(ide_drive_t *drive,
254 unsigned int *gtf_length, unsigned long *gtf_address,
255 unsigned long *obj_loc)
256{
257 acpi_status status;
258 struct acpi_buffer output;
259 union acpi_object *out_obj;
260 ide_hwif_t *hwif = HWIF(drive);
261 struct device *dev = hwif->gendev.parent;
262 int err = -ENODEV;
263 int port;
264
265 *gtf_length = 0;
266 *gtf_address = 0UL;
267 *obj_loc = 0UL;
268
269 if (ide_noacpi)
270 return 0;
271
272 if (!dev) {
273 DEBPRINT("no PCI device for %s\n", hwif->name);
274 goto out;
275 }
276
277 if (!hwif->acpidata) {
278 DEBPRINT("no ACPI data for %s\n", hwif->name);
279 goto out;
280 }
281
282 port = hwif->channel ? drive->dn - 2: drive->dn;
283
284 if (!drive->acpidata) {
285 if (port == 0) {
286 drive->acpidata = &hwif->acpidata->master;
287 hwif->acpidata->master.drive = drive;
288 } else {
289 drive->acpidata = &hwif->acpidata->slave;
290 hwif->acpidata->slave.drive = drive;
291 }
292 }
293
294 DEBPRINT("ENTER: %s at %s, port#: %d, hard_port#: %d\n",
295 hwif->name, dev->bus_id, port, hwif->channel);
296
297 if (!drive->present) {
298 DEBPRINT("%s drive %d:%d not present\n",
299 hwif->name, hwif->channel, port);
300 goto out;
301 }
302
303 /* Get this drive's _ADR info. if not already known. */
304 if (!drive->acpidata->obj_handle) {
305 drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
306 if (!drive->acpidata->obj_handle) {
307 DEBPRINT("No ACPI object found for %s\n",
308 drive->name);
309 goto out;
310 }
311 }
312
313 /* Setting up output buffer */
314 output.length = ACPI_ALLOCATE_BUFFER;
315 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
316
317 /* _GTF has no input parameters */
318 err = -EIO;
319 status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF",
320 NULL, &output);
321 if (ACPI_FAILURE(status)) {
322 printk(KERN_DEBUG
323 "%s: Run _GTF error: status = 0x%x\n",
324 __FUNCTION__, status);
325 goto out;
326 }
327
328 if (!output.length || !output.pointer) {
329 DEBPRINT("Run _GTF: "
330 "length or ptr is NULL (0x%llx, 0x%p)\n",
331 (unsigned long long)output.length,
332 output.pointer);
333 goto out;
334 }
335
336 out_obj = output.pointer;
337 if (out_obj->type != ACPI_TYPE_BUFFER) {
338 DEBPRINT("Run _GTF: error: "
339 "expected object type of ACPI_TYPE_BUFFER, "
340 "got 0x%x\n", out_obj->type);
341 err = -ENOENT;
342 kfree(output.pointer);
343 goto out;
344 }
345
346 if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
347 out_obj->buffer.length % REGS_PER_GTF) {
348 printk(KERN_ERR
349 "%s: unexpected GTF length (%d) or addr (0x%p)\n",
350 __FUNCTION__, out_obj->buffer.length,
351 out_obj->buffer.pointer);
352 err = -ENOENT;
353 kfree(output.pointer);
354 goto out;
355 }
356
357 *gtf_length = out_obj->buffer.length;
358 *gtf_address = (unsigned long)out_obj->buffer.pointer;
359 *obj_loc = (unsigned long)out_obj;
360 DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
361 *gtf_length, *gtf_address, *obj_loc);
362 err = 0;
363out:
364 return err;
365}
366
367/**
368 * taskfile_load_raw - send taskfile registers to drive
369 * @drive: drive to which output is sent
370 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
371 *
372 * Outputs IDE taskfile to the drive.
373 */
374static int taskfile_load_raw(ide_drive_t *drive,
375 const struct taskfile_array *gtf)
376{
377 ide_task_t args;
378 int err = 0;
379
380 DEBPRINT("(0x1f1-1f7): hex: "
381 "%02x %02x %02x %02x %02x %02x %02x\n",
382 gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
383 gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
384
385 memset(&args, 0, sizeof(ide_task_t));
Hannes Reineckee3a59b42007-02-07 18:19:37 +0100386
387 /* convert gtf to IDE Taskfile */
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100388 memcpy(&args.tf_array[7], &gtf->tfa, 7);
Bartlomiej Zolnierkiewicz657cc1a2008-01-26 20:13:10 +0100389 args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
Hannes Reineckee3a59b42007-02-07 18:19:37 +0100390
391 if (ide_noacpitfs) {
392 DEBPRINT("_GTF execution disabled\n");
393 return err;
394 }
395
Bartlomiej Zolnierkiewicz9a3c49b2008-01-25 22:17:07 +0100396 err = ide_no_data_taskfile(drive, &args);
Hannes Reineckee3a59b42007-02-07 18:19:37 +0100397 if (err)
Bartlomiej Zolnierkiewicz9a3c49b2008-01-25 22:17:07 +0100398 printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n",
Hannes Reineckee3a59b42007-02-07 18:19:37 +0100399 __FUNCTION__, err);
400
401 return err;
402}
403
404/**
405 * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
406 * @drive: the drive to which the taskfile command should be sent
407 * @gtf_length: total number of bytes of _GTF taskfiles
408 * @gtf_address: location of _GTF taskfile arrays
409 *
410 * Write {gtf_address, length gtf_length} in groups of
411 * REGS_PER_GTF bytes.
412 */
413static int do_drive_set_taskfiles(ide_drive_t *drive,
414 unsigned int gtf_length,
415 unsigned long gtf_address)
416{
417 int rc = -ENODEV, err;
418 int gtf_count = gtf_length / REGS_PER_GTF;
419 int ix;
420 struct taskfile_array *gtf;
421
422 if (ide_noacpi)
423 return 0;
424
425 DEBPRINT("ENTER: %s, hard_port#: %d\n", drive->name, drive->dn);
426
427 if (!drive->present)
428 goto out;
429 if (!gtf_count) /* shouldn't be here */
430 goto out;
431
432 DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
433 gtf_length, gtf_length, gtf_count, gtf_address);
434
435 if (gtf_length % REGS_PER_GTF) {
436 printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
437 __FUNCTION__, gtf_length);
438 goto out;
439 }
440
441 rc = 0;
442 for (ix = 0; ix < gtf_count; ix++) {
443 gtf = (struct taskfile_array *)
444 (gtf_address + ix * REGS_PER_GTF);
445
446 /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
447 err = taskfile_load_raw(drive, gtf);
448 if (err)
449 rc = err;
450 }
451
452out:
453 return rc;
454}
455
456/**
457 * ide_acpi_exec_tfs - get then write drive taskfile settings
458 * @drive: the drive for which the taskfile settings should be
459 * written.
460 *
461 * According to the ACPI spec this should be called after _STM
462 * has been evaluated for the interface. Some ACPI vendors interpret
463 * that as a hard requirement and modify the taskfile according
464 * to the Identify Drive information passed down with _STM.
465 * So one should really make sure to call this only after _STM has
466 * been executed.
467 */
468int ide_acpi_exec_tfs(ide_drive_t *drive)
469{
470 int ret;
471 unsigned int gtf_length;
472 unsigned long gtf_address;
473 unsigned long obj_loc;
474
475 if (ide_noacpi)
476 return 0;
477
478 DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
479
480 ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
481 if (ret < 0) {
482 DEBPRINT("get_GTF error (%d)\n", ret);
483 return ret;
484 }
485
486 DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);
487
488 ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
489 kfree((void *)obj_loc);
490 if (ret < 0) {
491 DEBPRINT("set_taskfiles error (%d)\n", ret);
492 }
493
494 DEBPRINT("ret=%d\n", ret);
495
496 return ret;
497}
498EXPORT_SYMBOL_GPL(ide_acpi_exec_tfs);
499
500/**
501 * ide_acpi_get_timing - get the channel (controller) timings
502 * @hwif: target IDE interface (channel)
503 *
504 * This function executes the _GTM ACPI method for the target channel.
505 *
506 */
507void ide_acpi_get_timing(ide_hwif_t *hwif)
508{
509 acpi_status status;
510 struct acpi_buffer output;
511 union acpi_object *out_obj;
512
513 if (ide_noacpi)
514 return;
515
516 DEBPRINT("ENTER:\n");
517
518 if (!hwif->acpidata) {
519 DEBPRINT("no ACPI data for %s\n", hwif->name);
520 return;
521 }
522
523 /* Setting up output buffer for _GTM */
524 output.length = ACPI_ALLOCATE_BUFFER;
525 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
526
527 /* _GTM has no input parameters */
528 status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
529 NULL, &output);
530
531 DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
532 status, output.pointer,
533 (unsigned long long)output.length);
534
535 if (ACPI_FAILURE(status)) {
536 DEBPRINT("Run _GTM error: status = 0x%x\n", status);
537 return;
538 }
539
540 if (!output.length || !output.pointer) {
541 DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
542 (unsigned long long)output.length,
543 output.pointer);
544 kfree(output.pointer);
545 return;
546 }
547
548 out_obj = output.pointer;
549 if (out_obj->type != ACPI_TYPE_BUFFER) {
550 kfree(output.pointer);
551 DEBPRINT("Run _GTM: error: "
552 "expected object type of ACPI_TYPE_BUFFER, "
553 "got 0x%x\n", out_obj->type);
554 return;
555 }
556
557 if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
558 out_obj->buffer.length != sizeof(struct GTM_buffer)) {
559 kfree(output.pointer);
560 printk(KERN_ERR
Andrew Morton1e8f34f2007-02-07 18:19:42 +0100561 "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
562 "addr (0x%p)\n",
563 __FUNCTION__, out_obj->buffer.length,
564 sizeof(struct GTM_buffer), out_obj->buffer.pointer);
Hannes Reineckee3a59b42007-02-07 18:19:37 +0100565 return;
566 }
567
568 memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
569 sizeof(struct GTM_buffer));
570
571 DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
572 out_obj->buffer.pointer, out_obj->buffer.length,
573 sizeof(struct GTM_buffer));
574
575 DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
576 hwif->acpidata->gtm.PIO_speed0,
577 hwif->acpidata->gtm.DMA_speed0,
578 hwif->acpidata->gtm.PIO_speed1,
579 hwif->acpidata->gtm.DMA_speed1,
580 hwif->acpidata->gtm.GTM_flags);
581
582 kfree(output.pointer);
583}
584EXPORT_SYMBOL_GPL(ide_acpi_get_timing);
585
586/**
587 * ide_acpi_push_timing - set the channel (controller) timings
588 * @hwif: target IDE interface (channel)
589 *
590 * This function executes the _STM ACPI method for the target channel.
591 *
592 * _STM requires Identify Drive data, which has to passed as an argument.
593 * Unfortunately hd_driveid is a mangled version which we can't readily
594 * use; hence we'll get the information afresh.
595 */
596void ide_acpi_push_timing(ide_hwif_t *hwif)
597{
598 acpi_status status;
599 struct acpi_object_list input;
600 union acpi_object in_params[3];
601 struct ide_acpi_drive_link *master = &hwif->acpidata->master;
602 struct ide_acpi_drive_link *slave = &hwif->acpidata->slave;
603
604 if (ide_noacpi)
605 return;
606
607 DEBPRINT("ENTER:\n");
608
609 if (!hwif->acpidata) {
610 DEBPRINT("no ACPI data for %s\n", hwif->name);
611 return;
612 }
613
614 /* Give the GTM buffer + drive Identify data to the channel via the
615 * _STM method: */
616 /* setup input parameters buffer for _STM */
617 input.count = 3;
618 input.pointer = in_params;
619 in_params[0].type = ACPI_TYPE_BUFFER;
620 in_params[0].buffer.length = sizeof(struct GTM_buffer);
621 in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
622 in_params[1].type = ACPI_TYPE_BUFFER;
623 in_params[1].buffer.length = sizeof(struct hd_driveid);
624 in_params[1].buffer.pointer = (u8 *)&master->idbuff;
625 in_params[2].type = ACPI_TYPE_BUFFER;
626 in_params[2].buffer.length = sizeof(struct hd_driveid);
627 in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
628 /* Output buffer: _STM has no output */
629
630 status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
631 &input, NULL);
632
633 if (ACPI_FAILURE(status)) {
634 DEBPRINT("Run _STM error: status = 0x%x\n", status);
635 }
636 DEBPRINT("_STM status: %d\n", status);
637}
638EXPORT_SYMBOL_GPL(ide_acpi_push_timing);
639
640/**
Shaohua Li5e321322007-10-11 23:53:58 +0200641 * ide_acpi_set_state - set the channel power state
642 * @hwif: target IDE interface
643 * @on: state, on/off
644 *
645 * This function executes the _PS0/_PS3 ACPI method to set the power state.
646 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
647 */
648void ide_acpi_set_state(ide_hwif_t *hwif, int on)
649{
650 int unit;
651
Shaohua Li90494892008-01-10 23:03:42 +0100652 if (ide_noacpi || ide_noacpi_psx)
Shaohua Li5e321322007-10-11 23:53:58 +0200653 return;
654
655 DEBPRINT("ENTER:\n");
656
657 if (!hwif->acpidata) {
658 DEBPRINT("no ACPI data for %s\n", hwif->name);
659 return;
660 }
661 /* channel first and then drives for power on and verse versa for power off */
662 if (on)
663 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
664 for (unit = 0; unit < MAX_DRIVES; ++unit) {
665 ide_drive_t *drive = &hwif->drives[unit];
666
667 if (!drive->acpidata->obj_handle)
668 drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
669
670 if (drive->acpidata->obj_handle && drive->present) {
671 acpi_bus_set_power(drive->acpidata->obj_handle,
672 on? ACPI_STATE_D0: ACPI_STATE_D3);
673 }
674 }
675 if (!on)
676 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
677}
Shaohua Li5e321322007-10-11 23:53:58 +0200678
679/**
Hannes Reineckee3a59b42007-02-07 18:19:37 +0100680 * ide_acpi_init - initialize the ACPI link for an IDE interface
681 * @hwif: target IDE interface (channel)
682 *
683 * The ACPI spec is not quite clear when the drive identify buffer
684 * should be obtained. Calling IDENTIFY DEVICE during shutdown
685 * is not the best of ideas as the drive might already being put to
686 * sleep. And obviously we can't call it during resume.
687 * So we get the information during startup; but this means that
688 * any changes during run-time will be lost after resume.
689 */
690void ide_acpi_init(ide_hwif_t *hwif)
691{
692 int unit;
693 int err;
694 struct ide_acpi_drive_link *master;
695 struct ide_acpi_drive_link *slave;
696
Shaohua Li90494892008-01-10 23:03:42 +0100697 ide_acpi_blacklist();
698
Hannes Reineckee3a59b42007-02-07 18:19:37 +0100699 hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
700 if (!hwif->acpidata)
701 return;
702
703 hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
704 if (!hwif->acpidata->obj_handle) {
705 DEBPRINT("no ACPI object for %s found\n", hwif->name);
706 kfree(hwif->acpidata);
707 hwif->acpidata = NULL;
708 return;
709 }
710
711 /*
712 * The ACPI spec mandates that we send information
713 * for both drives, regardless whether they are connected
714 * or not.
715 */
716 hwif->acpidata->master.drive = &hwif->drives[0];
717 hwif->drives[0].acpidata = &hwif->acpidata->master;
718 master = &hwif->acpidata->master;
719
720 hwif->acpidata->slave.drive = &hwif->drives[1];
721 hwif->drives[1].acpidata = &hwif->acpidata->slave;
722 slave = &hwif->acpidata->slave;
723
724
725 /*
726 * Send IDENTIFY for each drive
727 */
728 if (master->drive->present) {
729 err = taskfile_lib_get_identify(master->drive, master->idbuff);
730 if (err) {
731 DEBPRINT("identify device %s failed (%d)\n",
732 master->drive->name, err);
733 }
734 }
735
736 if (slave->drive->present) {
737 err = taskfile_lib_get_identify(slave->drive, slave->idbuff);
738 if (err) {
739 DEBPRINT("identify device %s failed (%d)\n",
740 slave->drive->name, err);
741 }
742 }
743
744 if (ide_noacpionboot) {
745 DEBPRINT("ACPI methods disabled on boot\n");
746 return;
747 }
748
Shaohua Li5e321322007-10-11 23:53:58 +0200749 /* ACPI _PS0 before _STM */
750 ide_acpi_set_state(hwif, 1);
Hannes Reineckee3a59b42007-02-07 18:19:37 +0100751 /*
752 * ACPI requires us to call _STM on startup
753 */
754 ide_acpi_get_timing(hwif);
755 ide_acpi_push_timing(hwif);
756
757 for (unit = 0; unit < MAX_DRIVES; ++unit) {
758 ide_drive_t *drive = &hwif->drives[unit];
759
760 if (drive->present) {
761 /* Execute ACPI startup code */
762 ide_acpi_exec_tfs(drive);
763 }
764 }
765}
766EXPORT_SYMBOL_GPL(ide_acpi_init);