Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-2.6] / drivers / ide / ide-acpi.c
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 #include <linux/dmi.h>
20
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
30 struct taskfile_array {
31         u8      tfa[REGS_PER_GTF];      /* regs. 0x1f1 - 0x1f7 */
32 };
33
34 struct GTM_buffer {
35         u32     PIO_speed0;
36         u32     DMA_speed0;
37         u32     PIO_speed1;
38         u32     DMA_speed1;
39         u32     GTM_flags;
40 };
41
42 struct ide_acpi_drive_link {
43         ide_drive_t     *drive;
44         acpi_handle      obj_handle;
45         u8               idbuff[512];
46 };
47
48 struct 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
65 extern int ide_noacpi;
66 extern int ide_noacpitfs;
67 extern int ide_noacpionboot;
68
69 static bool ide_noacpi_psx;
70 static 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
77 static 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         },
88
89         { }     /* terminate list */
90 };
91
92 static 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
102 /**
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  */
112 static 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;
160 err:
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  */
173 static 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  */
213 static 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  */
253 static 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;
363 out:
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  */
374 static 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));
386
387         /* convert gtf to IDE Taskfile */
388         memcpy(&args.tf_array[7], &gtf->tfa, 7);
389         args.tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_OUT_DEVICE;
390
391         if (ide_noacpitfs) {
392                 DEBPRINT("_GTF execution disabled\n");
393                 return err;
394         }
395
396         err = ide_no_data_taskfile(drive, &args);
397         if (err)
398                 printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n",
399                        __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  */
413 static 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
452 out:
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  */
468 int 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 }
498 EXPORT_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  */
507 void 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
561                         "%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);
565                 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 }
584 EXPORT_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  */
596 void 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 }
638 EXPORT_SYMBOL_GPL(ide_acpi_push_timing);
639
640 /**
641  * 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  */
648 void ide_acpi_set_state(ide_hwif_t *hwif, int on)
649 {
650         int unit;
651
652         if (ide_noacpi || ide_noacpi_psx)
653                 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 }
678
679 /**
680  * 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  */
690 void 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
697         ide_acpi_blacklist();
698
699         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
749         /* ACPI _PS0 before _STM */
750         ide_acpi_set_state(hwif, 1);
751         /*
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 }
766 EXPORT_SYMBOL_GPL(ide_acpi_init);