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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / drivers / ide / ide-acpi.c
1 /*
2  * Provides ACPI support for IDE drives.
3  *
4  * Copyright (C) 2005 Intel Corp.
5  * Copyright (C) 2005 Randy Dunlap
6  * Copyright (C) 2006 SUSE Linux Products GmbH
7  * Copyright (C) 2006 Hannes Reinecke
8  */
9
10 #include <linux/ata.h>
11 #include <linux/delay.h>
12 #include <linux/device.h>
13 #include <linux/errno.h>
14 #include <linux/kernel.h>
15 #include <acpi/acpi.h>
16 #include <linux/ide.h>
17 #include <linux/pci.h>
18 #include <linux/dmi.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         acpi_handle      obj_handle;
43         u8               idbuff[512];
44 };
45
46 struct ide_acpi_hwif_link {
47         ide_hwif_t                      *hwif;
48         acpi_handle                      obj_handle;
49         struct GTM_buffer                gtm;
50         struct ide_acpi_drive_link       master;
51         struct ide_acpi_drive_link       slave;
52 };
53
54 #undef DEBUGGING
55 /* note: adds function name and KERN_DEBUG */
56 #ifdef DEBUGGING
57 #define DEBPRINT(fmt, args...)  \
58                 printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
59 #else
60 #define DEBPRINT(fmt, args...)  do {} while (0)
61 #endif  /* DEBUGGING */
62
63 static int ide_noacpi;
64 module_param_named(noacpi, ide_noacpi, bool, 0);
65 MODULE_PARM_DESC(noacpi, "disable IDE ACPI support");
66
67 static int ide_acpigtf;
68 module_param_named(acpigtf, ide_acpigtf, bool, 0);
69 MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support");
70
71 static int ide_acpionboot;
72 module_param_named(acpionboot, ide_acpionboot, bool, 0);
73 MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot");
74
75 static bool ide_noacpi_psx;
76 static int no_acpi_psx(const struct dmi_system_id *id)
77 {
78         ide_noacpi_psx = true;
79         printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident);
80         return 0;
81 }
82
83 static const struct dmi_system_id ide_acpi_dmi_table[] = {
84         /* Bug 9673. */
85         /* We should check if this is because ACPI NVS isn't save/restored. */
86         {
87                 .callback = no_acpi_psx,
88                 .ident    = "HP nx9005",
89                 .matches  = {
90                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."),
91                         DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60")
92                 },
93         },
94
95         { }     /* terminate list */
96 };
97
98 static int ide_acpi_blacklist(void)
99 {
100         static int done;
101         if (done)
102                 return 0;
103         done = 1;
104         dmi_check_system(ide_acpi_dmi_table);
105         return 0;
106 }
107
108 /**
109  * ide_get_dev_handle - finds acpi_handle and PCI device.function
110  * @dev: device to locate
111  * @handle: returned acpi_handle for @dev
112  * @pcidevfn: return PCI device.func for @dev
113  *
114  * Returns the ACPI object handle to the corresponding PCI device.
115  *
116  * Returns 0 on success, <0 on error.
117  */
118 static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
119                                acpi_integer *pcidevfn)
120 {
121         struct pci_dev *pdev = to_pci_dev(dev);
122         unsigned int bus, devnum, func;
123         acpi_integer addr;
124         acpi_handle dev_handle;
125         struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
126                                         .pointer = NULL};
127         acpi_status status;
128         struct acpi_device_info *dinfo = NULL;
129         int ret = -ENODEV;
130
131         bus = pdev->bus->number;
132         devnum = PCI_SLOT(pdev->devfn);
133         func = PCI_FUNC(pdev->devfn);
134         /* ACPI _ADR encoding for PCI bus: */
135         addr = (acpi_integer)(devnum << 16 | func);
136
137         DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func);
138
139         dev_handle = DEVICE_ACPI_HANDLE(dev);
140         if (!dev_handle) {
141                 DEBPRINT("no acpi handle for device\n");
142                 goto err;
143         }
144
145         status = acpi_get_object_info(dev_handle, &buffer);
146         if (ACPI_FAILURE(status)) {
147                 DEBPRINT("get_object_info for device failed\n");
148                 goto err;
149         }
150         dinfo = buffer.pointer;
151         if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
152             dinfo->address == addr) {
153                 *pcidevfn = addr;
154                 *handle = dev_handle;
155         } else {
156                 DEBPRINT("get_object_info for device has wrong "
157                         " address: %llu, should be %u\n",
158                         dinfo ? (unsigned long long)dinfo->address : -1ULL,
159                         (unsigned int)addr);
160                 goto err;
161         }
162
163         DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n",
164                  devnum, func, (unsigned long long)addr, *handle);
165         ret = 0;
166 err:
167         kfree(dinfo);
168         return ret;
169 }
170
171 /**
172  * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif
173  * @hwif: device to locate
174  *
175  * Retrieves the object handle for a given hwif.
176  *
177  * Returns handle on success, 0 on error.
178  */
179 static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif)
180 {
181         struct device           *dev = hwif->gendev.parent;
182         acpi_handle             uninitialized_var(dev_handle);
183         acpi_integer            pcidevfn;
184         acpi_handle             chan_handle;
185         int                     err;
186
187         DEBPRINT("ENTER: device %s\n", hwif->name);
188
189         if (!dev) {
190                 DEBPRINT("no PCI device for %s\n", hwif->name);
191                 return NULL;
192         }
193
194         err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn);
195         if (err < 0) {
196                 DEBPRINT("ide_get_dev_handle failed (%d)\n", err);
197                 return NULL;
198         }
199
200         /* get child objects of dev_handle == channel objects,
201          * + _their_ children == drive objects */
202         /* channel is hwif->channel */
203         chan_handle = acpi_get_child(dev_handle, hwif->channel);
204         DEBPRINT("chan adr=%d: handle=0x%p\n",
205                  hwif->channel, chan_handle);
206
207         return chan_handle;
208 }
209
210 /**
211  * ide_acpi_drive_get_handle - Get ACPI object handle for a given drive
212  * @drive: device to locate
213  *
214  * Retrieves the object handle of a given drive. According to the ACPI
215  * spec the drive is a child of the hwif.
216  *
217  * Returns handle on success, 0 on error.
218  */
219 static acpi_handle ide_acpi_drive_get_handle(ide_drive_t *drive)
220 {
221         ide_hwif_t      *hwif = HWIF(drive);
222         int              port;
223         acpi_handle      drive_handle;
224
225         if (!hwif->acpidata)
226                 return NULL;
227
228         if (!hwif->acpidata->obj_handle)
229                 return NULL;
230
231         port = hwif->channel ? drive->dn - 2: drive->dn;
232
233         DEBPRINT("ENTER: %s at channel#: %d port#: %d\n",
234                  drive->name, hwif->channel, port);
235
236
237         /* TBD: could also check ACPI object VALID bits */
238         drive_handle = acpi_get_child(hwif->acpidata->obj_handle, port);
239         DEBPRINT("drive %s handle 0x%p\n", drive->name, drive_handle);
240
241         return drive_handle;
242 }
243
244 /**
245  * do_drive_get_GTF - get the drive bootup default taskfile settings
246  * @drive: the drive for which the taskfile settings should be retrieved
247  * @gtf_length: number of bytes of _GTF data returned at @gtf_address
248  * @gtf_address: buffer containing _GTF taskfile arrays
249  *
250  * The _GTF method has no input parameters.
251  * It returns a variable number of register set values (registers
252  * hex 1F1..1F7, taskfiles).
253  * The <variable number> is not known in advance, so have ACPI-CA
254  * allocate the buffer as needed and return it, then free it later.
255  *
256  * The returned @gtf_length and @gtf_address are only valid if the
257  * function return value is 0.
258  */
259 static int do_drive_get_GTF(ide_drive_t *drive,
260                      unsigned int *gtf_length, unsigned long *gtf_address,
261                      unsigned long *obj_loc)
262 {
263         acpi_status                     status;
264         struct acpi_buffer              output;
265         union acpi_object               *out_obj;
266         ide_hwif_t                      *hwif = HWIF(drive);
267         struct device                   *dev = hwif->gendev.parent;
268         int                             err = -ENODEV;
269         int                             port;
270
271         *gtf_length = 0;
272         *gtf_address = 0UL;
273         *obj_loc = 0UL;
274
275         if (ide_noacpi)
276                 return 0;
277
278         if (!dev) {
279                 DEBPRINT("no PCI device for %s\n", hwif->name);
280                 goto out;
281         }
282
283         if (!hwif->acpidata) {
284                 DEBPRINT("no ACPI data for %s\n", hwif->name);
285                 goto out;
286         }
287
288         port = hwif->channel ? drive->dn - 2: drive->dn;
289
290         DEBPRINT("ENTER: %s at %s, port#: %d, hard_port#: %d\n",
291                  hwif->name, dev->bus_id, port, hwif->channel);
292
293         if (!drive->present) {
294                 DEBPRINT("%s drive %d:%d not present\n",
295                          hwif->name, hwif->channel, port);
296                 goto out;
297         }
298
299         /* Get this drive's _ADR info. if not already known. */
300         if (!drive->acpidata->obj_handle) {
301                 drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
302                 if (!drive->acpidata->obj_handle) {
303                         DEBPRINT("No ACPI object found for %s\n",
304                                  drive->name);
305                         goto out;
306                 }
307         }
308
309         /* Setting up output buffer */
310         output.length = ACPI_ALLOCATE_BUFFER;
311         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
312
313         /* _GTF has no input parameters */
314         err = -EIO;
315         status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF",
316                                       NULL, &output);
317         if (ACPI_FAILURE(status)) {
318                 printk(KERN_DEBUG
319                        "%s: Run _GTF error: status = 0x%x\n",
320                        __func__, status);
321                 goto out;
322         }
323
324         if (!output.length || !output.pointer) {
325                 DEBPRINT("Run _GTF: "
326                        "length or ptr is NULL (0x%llx, 0x%p)\n",
327                        (unsigned long long)output.length,
328                        output.pointer);
329                 goto out;
330         }
331
332         out_obj = output.pointer;
333         if (out_obj->type != ACPI_TYPE_BUFFER) {
334                 DEBPRINT("Run _GTF: error: "
335                        "expected object type of ACPI_TYPE_BUFFER, "
336                        "got 0x%x\n", out_obj->type);
337                 err = -ENOENT;
338                 kfree(output.pointer);
339                 goto out;
340         }
341
342         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
343             out_obj->buffer.length % REGS_PER_GTF) {
344                 printk(KERN_ERR
345                        "%s: unexpected GTF length (%d) or addr (0x%p)\n",
346                        __func__, out_obj->buffer.length,
347                        out_obj->buffer.pointer);
348                 err = -ENOENT;
349                 kfree(output.pointer);
350                 goto out;
351         }
352
353         *gtf_length = out_obj->buffer.length;
354         *gtf_address = (unsigned long)out_obj->buffer.pointer;
355         *obj_loc = (unsigned long)out_obj;
356         DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
357                  *gtf_length, *gtf_address, *obj_loc);
358         err = 0;
359 out:
360         return err;
361 }
362
363 /**
364  * taskfile_load_raw - send taskfile registers to drive
365  * @drive: drive to which output is sent
366  * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
367  *
368  * Outputs IDE taskfile to the drive.
369  */
370 static int taskfile_load_raw(ide_drive_t *drive,
371                               const struct taskfile_array *gtf)
372 {
373         ide_task_t args;
374         int err = 0;
375
376         DEBPRINT("(0x1f1-1f7): hex: "
377                "%02x %02x %02x %02x %02x %02x %02x\n",
378                gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
379                gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
380
381         memset(&args, 0, sizeof(ide_task_t));
382
383         /* convert gtf to IDE Taskfile */
384         memcpy(&args.tf_array[7], &gtf->tfa, 7);
385         args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
386
387         if (!ide_acpigtf) {
388                 DEBPRINT("_GTF execution disabled\n");
389                 return err;
390         }
391
392         err = ide_no_data_taskfile(drive, &args);
393         if (err)
394                 printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n",
395                        __func__, err);
396
397         return err;
398 }
399
400 /**
401  * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
402  * @drive: the drive to which the taskfile command should be sent
403  * @gtf_length: total number of bytes of _GTF taskfiles
404  * @gtf_address: location of _GTF taskfile arrays
405  *
406  * Write {gtf_address, length gtf_length} in groups of
407  * REGS_PER_GTF bytes.
408  */
409 static int do_drive_set_taskfiles(ide_drive_t *drive,
410                                   unsigned int gtf_length,
411                                   unsigned long gtf_address)
412 {
413         int                     rc = -ENODEV, err;
414         int                     gtf_count = gtf_length / REGS_PER_GTF;
415         int                     ix;
416         struct taskfile_array   *gtf;
417
418         if (ide_noacpi)
419                 return 0;
420
421         DEBPRINT("ENTER: %s, hard_port#: %d\n", drive->name, drive->dn);
422
423         if (!drive->present)
424                 goto out;
425         if (!gtf_count)         /* shouldn't be here */
426                 goto out;
427
428         DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
429                  gtf_length, gtf_length, gtf_count, gtf_address);
430
431         if (gtf_length % REGS_PER_GTF) {
432                 printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
433                        __func__, gtf_length);
434                 goto out;
435         }
436
437         rc = 0;
438         for (ix = 0; ix < gtf_count; ix++) {
439                 gtf = (struct taskfile_array *)
440                         (gtf_address + ix * REGS_PER_GTF);
441
442                 /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
443                 err = taskfile_load_raw(drive, gtf);
444                 if (err)
445                         rc = err;
446         }
447
448 out:
449         return rc;
450 }
451
452 /**
453  * ide_acpi_exec_tfs - get then write drive taskfile settings
454  * @drive: the drive for which the taskfile settings should be
455  *         written.
456  *
457  * According to the ACPI spec this should be called after _STM
458  * has been evaluated for the interface. Some ACPI vendors interpret
459  * that as a hard requirement and modify the taskfile according
460  * to the Identify Drive information passed down with _STM.
461  * So one should really make sure to call this only after _STM has
462  * been executed.
463  */
464 int ide_acpi_exec_tfs(ide_drive_t *drive)
465 {
466         int             ret;
467         unsigned int    gtf_length;
468         unsigned long   gtf_address;
469         unsigned long   obj_loc;
470
471         if (ide_noacpi)
472                 return 0;
473
474         DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
475
476         ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
477         if (ret < 0) {
478                 DEBPRINT("get_GTF error (%d)\n", ret);
479                 return ret;
480         }
481
482         DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);
483
484         ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
485         kfree((void *)obj_loc);
486         if (ret < 0) {
487                 DEBPRINT("set_taskfiles error (%d)\n", ret);
488         }
489
490         DEBPRINT("ret=%d\n", ret);
491
492         return ret;
493 }
494
495 /**
496  * ide_acpi_get_timing - get the channel (controller) timings
497  * @hwif: target IDE interface (channel)
498  *
499  * This function executes the _GTM ACPI method for the target channel.
500  *
501  */
502 void ide_acpi_get_timing(ide_hwif_t *hwif)
503 {
504         acpi_status             status;
505         struct acpi_buffer      output;
506         union acpi_object       *out_obj;
507
508         if (ide_noacpi)
509                 return;
510
511         DEBPRINT("ENTER:\n");
512
513         if (!hwif->acpidata) {
514                 DEBPRINT("no ACPI data for %s\n", hwif->name);
515                 return;
516         }
517
518         /* Setting up output buffer for _GTM */
519         output.length = ACPI_ALLOCATE_BUFFER;
520         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
521
522         /* _GTM has no input parameters */
523         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
524                                       NULL, &output);
525
526         DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
527                  status, output.pointer,
528                  (unsigned long long)output.length);
529
530         if (ACPI_FAILURE(status)) {
531                 DEBPRINT("Run _GTM error: status = 0x%x\n", status);
532                 return;
533         }
534
535         if (!output.length || !output.pointer) {
536                 DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
537                        (unsigned long long)output.length,
538                        output.pointer);
539                 kfree(output.pointer);
540                 return;
541         }
542
543         out_obj = output.pointer;
544         if (out_obj->type != ACPI_TYPE_BUFFER) {
545                 kfree(output.pointer);
546                 DEBPRINT("Run _GTM: error: "
547                        "expected object type of ACPI_TYPE_BUFFER, "
548                        "got 0x%x\n", out_obj->type);
549                 return;
550         }
551
552         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
553             out_obj->buffer.length != sizeof(struct GTM_buffer)) {
554                 kfree(output.pointer);
555                 printk(KERN_ERR
556                         "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
557                         "addr (0x%p)\n",
558                         __func__, out_obj->buffer.length,
559                         sizeof(struct GTM_buffer), out_obj->buffer.pointer);
560                 return;
561         }
562
563         memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
564                sizeof(struct GTM_buffer));
565
566         DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
567                  out_obj->buffer.pointer, out_obj->buffer.length,
568                  sizeof(struct GTM_buffer));
569
570         DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
571                  hwif->acpidata->gtm.PIO_speed0,
572                  hwif->acpidata->gtm.DMA_speed0,
573                  hwif->acpidata->gtm.PIO_speed1,
574                  hwif->acpidata->gtm.DMA_speed1,
575                  hwif->acpidata->gtm.GTM_flags);
576
577         kfree(output.pointer);
578 }
579
580 /**
581  * ide_acpi_push_timing - set the channel (controller) timings
582  * @hwif: target IDE interface (channel)
583  *
584  * This function executes the _STM ACPI method for the target channel.
585  *
586  * _STM requires Identify Drive data, which has to passed as an argument.
587  * Unfortunately hd_driveid is a mangled version which we can't readily
588  * use; hence we'll get the information afresh.
589  */
590 void ide_acpi_push_timing(ide_hwif_t *hwif)
591 {
592         acpi_status             status;
593         struct acpi_object_list input;
594         union acpi_object       in_params[3];
595         struct ide_acpi_drive_link      *master = &hwif->acpidata->master;
596         struct ide_acpi_drive_link      *slave = &hwif->acpidata->slave;
597
598         if (ide_noacpi)
599                 return;
600
601         DEBPRINT("ENTER:\n");
602
603         if (!hwif->acpidata) {
604                 DEBPRINT("no ACPI data for %s\n", hwif->name);
605                 return;
606         }
607
608         /* Give the GTM buffer + drive Identify data to the channel via the
609          * _STM method: */
610         /* setup input parameters buffer for _STM */
611         input.count = 3;
612         input.pointer = in_params;
613         in_params[0].type = ACPI_TYPE_BUFFER;
614         in_params[0].buffer.length = sizeof(struct GTM_buffer);
615         in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
616         in_params[1].type = ACPI_TYPE_BUFFER;
617         in_params[1].buffer.length = sizeof(struct hd_driveid);
618         in_params[1].buffer.pointer = (u8 *)&master->idbuff;
619         in_params[2].type = ACPI_TYPE_BUFFER;
620         in_params[2].buffer.length = sizeof(struct hd_driveid);
621         in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
622         /* Output buffer: _STM has no output */
623
624         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
625                                       &input, NULL);
626
627         if (ACPI_FAILURE(status)) {
628                 DEBPRINT("Run _STM error: status = 0x%x\n", status);
629         }
630         DEBPRINT("_STM status: %d\n", status);
631 }
632
633 /**
634  * ide_acpi_set_state - set the channel power state
635  * @hwif: target IDE interface
636  * @on: state, on/off
637  *
638  * This function executes the _PS0/_PS3 ACPI method to set the power state.
639  * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
640  */
641 void ide_acpi_set_state(ide_hwif_t *hwif, int on)
642 {
643         int unit;
644
645         if (ide_noacpi || ide_noacpi_psx)
646                 return;
647
648         DEBPRINT("ENTER:\n");
649
650         if (!hwif->acpidata) {
651                 DEBPRINT("no ACPI data for %s\n", hwif->name);
652                 return;
653         }
654         /* channel first and then drives for power on and verse versa for power off */
655         if (on)
656                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
657         for (unit = 0; unit < MAX_DRIVES; ++unit) {
658                 ide_drive_t *drive = &hwif->drives[unit];
659
660                 if (!drive->acpidata->obj_handle)
661                         drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
662
663                 if (drive->acpidata->obj_handle && drive->present) {
664                         acpi_bus_set_power(drive->acpidata->obj_handle,
665                                 on? ACPI_STATE_D0: ACPI_STATE_D3);
666                 }
667         }
668         if (!on)
669                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
670 }
671
672 /**
673  * ide_acpi_init - initialize the ACPI link for an IDE interface
674  * @hwif: target IDE interface (channel)
675  *
676  * The ACPI spec is not quite clear when the drive identify buffer
677  * should be obtained. Calling IDENTIFY DEVICE during shutdown
678  * is not the best of ideas as the drive might already being put to
679  * sleep. And obviously we can't call it during resume.
680  * So we get the information during startup; but this means that
681  * any changes during run-time will be lost after resume.
682  */
683 void ide_acpi_init(ide_hwif_t *hwif)
684 {
685         ide_acpi_blacklist();
686
687         hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
688         if (!hwif->acpidata)
689                 return;
690
691         hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
692         if (!hwif->acpidata->obj_handle) {
693                 DEBPRINT("no ACPI object for %s found\n", hwif->name);
694                 kfree(hwif->acpidata);
695                 hwif->acpidata = NULL;
696         }
697 }
698
699 void ide_acpi_port_init_devices(ide_hwif_t *hwif)
700 {
701         ide_drive_t *drive;
702         int i, err;
703
704         if (hwif->acpidata == NULL)
705                 return;
706
707         /*
708          * The ACPI spec mandates that we send information
709          * for both drives, regardless whether they are connected
710          * or not.
711          */
712         hwif->drives[0].acpidata = &hwif->acpidata->master;
713         hwif->drives[1].acpidata = &hwif->acpidata->slave;
714
715         /*
716          * Send IDENTIFY for each drive
717          */
718         for (i = 0; i < MAX_DRIVES; i++) {
719                 drive = &hwif->drives[i];
720
721                 memset(drive->acpidata, 0, sizeof(*drive->acpidata));
722
723                 if (!drive->present)
724                         continue;
725
726                 err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff);
727                 if (err)
728                         DEBPRINT("identify device %s failed (%d)\n",
729                                  drive->name, err);
730         }
731
732         if (!ide_acpionboot) {
733                 DEBPRINT("ACPI methods disabled on boot\n");
734                 return;
735         }
736
737         /* ACPI _PS0 before _STM */
738         ide_acpi_set_state(hwif, 1);
739         /*
740          * ACPI requires us to call _STM on startup
741          */
742         ide_acpi_get_timing(hwif);
743         ide_acpi_push_timing(hwif);
744
745         for (i = 0; i < MAX_DRIVES; i++) {
746                 drive = &hwif->drives[i];
747
748                 if (drive->present)
749                         /* Execute ACPI startup code */
750                         ide_acpi_exec_tfs(drive);
751         }
752 }