drivers/ata/libata-acpi.c

   1 /*
   2  * libata-acpi.c
   3  * Provides ACPI support for PATA/SATA.
   4  *
   5  * Copyright (C) 2006 Intel Corp.
   6  * Copyright (C) 2006 Randy Dunlap
   7  */
   8
   9 #include <linux/ata.h>
  10 #include <linux/delay.h>
  11 #include <linux/device.h>
  12 #include <linux/errno.h>
  13 #include <linux/kernel.h>
  14 #include <linux/acpi.h>
  15 #include <linux/libata.h>
  16 #include <linux/pci.h>
  17 #include "libata.h"
  18
  19 #include <acpi/acpi_bus.h>
  20 #include <acpi/acnames.h>
  21 #include <acpi/acnamesp.h>
  22 #include <acpi/acparser.h>
  23 #include <acpi/acexcep.h>
  24 #include <acpi/acmacros.h>
  25 #include <acpi/actypes.h>
  26
  27 #define SATA_ROOT_PORT(x)       (((x) >> 16) & 0xffff)
  28 #define SATA_PORT_NUMBER(x)     ((x) & 0xffff)  /* or NO_PORT_MULT */
  29 #define NO_PORT_MULT            0xffff
  30 #define SATA_ADR_RSVD           0xffffffff
  31
  32 #define REGS_PER_GTF            7
  33 struct taskfile_array {
  34         u8      tfa[REGS_PER_GTF];      /* regs. 0x1f1 - 0x1f7 */
  35 };
  36
  37 /*
  38  *      Helper - belongs in the PCI layer somewhere eventually
  39  */
  40 static int is_pci_dev(struct device *dev)
  41 {
  42         return (dev->bus == &pci_bus_type);
  43 }
  44
  45 /**
  46  * sata_get_dev_handle - finds acpi_handle and PCI device.function
  47  * @dev: device to locate
  48  * @handle: returned acpi_handle for @dev
  49  * @pcidevfn: return PCI device.func for @dev
  50  *
  51  * This function is somewhat SATA-specific.  Or at least the
  52  * PATA & SATA versions of this function are different,
  53  * so it's not entirely generic code.
  54  *
  55  * Returns 0 on success, <0 on error.
  56  */
  57 static int sata_get_dev_handle(struct device *dev, acpi_handle *handle,
  58                                         acpi_integer *pcidevfn)
  59 {
  60         struct pci_dev  *pci_dev;
  61         acpi_integer    addr;
  62
  63         if (!is_pci_dev(dev))
  64                 return -ENODEV;
  65
  66         pci_dev = to_pci_dev(dev);      /* NOTE: PCI-specific */
  67         /* Please refer to the ACPI spec for the syntax of _ADR. */
  68         addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
  69         *pcidevfn = addr;
  70         *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
  71         if (!*handle)
  72                 return -ENODEV;
  73         return 0;
  74 }
  75
  76 /**
  77  * pata_get_dev_handle - finds acpi_handle and PCI device.function
  78  * @dev: device to locate
  79  * @handle: returned acpi_handle for @dev
  80  * @pcidevfn: return PCI device.func for @dev
  81  *
  82  * The PATA and SATA versions of this function are different.
  83  *
  84  * Returns 0 on success, <0 on error.
  85  */
  86 static int pata_get_dev_handle(struct device *dev, acpi_handle *handle,
  87                                 acpi_integer *pcidevfn)
  88 {
  89         unsigned int bus, devnum, func;
  90         acpi_integer addr;
  91         acpi_handle dev_handle, parent_handle;
  92         struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
  93                                         .pointer = NULL};
  94         acpi_status status;
  95         struct acpi_device_info *dinfo = NULL;
  96         int ret = -ENODEV;
  97         struct pci_dev *pdev;
  98
  99         if (!is_pci_dev(dev))
 100                 return -ENODEV;
 101
 102         pdev = to_pci_dev(dev);
 103
 104         bus = pdev->bus->number;
 105         devnum = PCI_SLOT(pdev->devfn);
 106         func = PCI_FUNC(pdev->devfn);
 107
 108         dev_handle = DEVICE_ACPI_HANDLE(dev);
 109         parent_handle = DEVICE_ACPI_HANDLE(dev->parent);
 110
 111         status = acpi_get_object_info(parent_handle, &buffer);
 112         if (ACPI_FAILURE(status))
 113                 goto err;
 114
 115         dinfo = buffer.pointer;
 116         if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
 117             dinfo->address == bus) {
 118                 /* ACPI spec for _ADR for PCI bus: */
 119                 addr = (acpi_integer)(devnum << 16 | func);
 120                 *pcidevfn = addr;
 121                 *handle = dev_handle;
 122         } else {
 123                 goto err;
 124         }
 125
 126         if (!*handle)
 127                 goto err;
 128         ret = 0;
 129 err:
 130         kfree(dinfo);
 131         return ret;
 132 }
 133
 134 struct walk_info {              /* can be trimmed some */
 135         struct device   *dev;
 136         struct acpi_device *adev;
 137         acpi_handle     handle;
 138         acpi_integer    pcidevfn;
 139         unsigned int    drivenum;
 140         acpi_handle     obj_handle;
 141         struct ata_port *ataport;
 142         struct ata_device *atadev;
 143         u32             sata_adr;
 144         int             status;
 145         char            basepath[ACPI_PATHNAME_MAX];
 146         int             basepath_len;
 147 };
 148
 149 static acpi_status get_devices(acpi_handle handle,
 150                                 u32 level, void *context, void **return_value)
 151 {
 152         acpi_status             status;
 153         struct walk_info        *winfo = context;
 154         struct acpi_buffer      namebuf = {ACPI_ALLOCATE_BUFFER, NULL};
 155         char                    *pathname;
 156         struct acpi_buffer      buffer;
 157         struct acpi_device_info *dinfo;
 158
 159         status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &namebuf);
 160         if (status)
 161                 goto ret;
 162         pathname = namebuf.pointer;
 163
 164         buffer.length = ACPI_ALLOCATE_BUFFER;
 165         buffer.pointer = NULL;
 166         status = acpi_get_object_info(handle, &buffer);
 167         if (ACPI_FAILURE(status))
 168                 goto out2;
 169
 170         dinfo = buffer.pointer;
 171
 172         /* find full device path name for pcidevfn */
 173         if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
 174             dinfo->address == winfo->pcidevfn) {
 175                 if (ata_msg_probe(winfo->ataport))
 176                         ata_dev_printk(winfo->atadev, KERN_DEBUG,
 177                                 ":%s: matches pcidevfn (0x%llx)\n",
 178                                 pathname, winfo->pcidevfn);
 179                 strlcpy(winfo->basepath, pathname,
 180                         sizeof(winfo->basepath));
 181                 winfo->basepath_len = strlen(pathname);
 182                 goto out;
 183         }
 184
 185         /* if basepath is not yet known, ignore this object */
 186         if (!winfo->basepath_len)
 187                 goto out;
 188
 189         /* if this object is in scope of basepath, maybe use it */
 190         if (strncmp(pathname, winfo->basepath,
 191             winfo->basepath_len) == 0) {
 192                 if (!(dinfo->valid & ACPI_VALID_ADR))
 193                         goto out;
 194                 if (ata_msg_probe(winfo->ataport))
 195                         ata_dev_printk(winfo->atadev, KERN_DEBUG,
 196                                 "GOT ONE: (%s) root_port = 0x%llx,"
 197                                 " port_num = 0x%llx\n", pathname,
 198                                 SATA_ROOT_PORT(dinfo->address),
 199                                 SATA_PORT_NUMBER(dinfo->address));
 200                 /* heuristics: */
 201                 if (SATA_PORT_NUMBER(dinfo->address) != NO_PORT_MULT)
 202                         if (ata_msg_probe(winfo->ataport))
 203                                 ata_dev_printk(winfo->atadev,
 204                                         KERN_DEBUG, "warning: don't"
 205                                         " know how to handle SATA port"
 206                                         " multiplier\n");
 207                 if (SATA_ROOT_PORT(dinfo->address) ==
 208                         winfo->ataport->port_no &&
 209                     SATA_PORT_NUMBER(dinfo->address) == NO_PORT_MULT) {
 210                         if (ata_msg_probe(winfo->ataport))
 211                                 ata_dev_printk(winfo->atadev,
 212                                         KERN_DEBUG,
 213                                         "THIS ^^^^^ is the requested"
 214                                         " SATA drive (handle = 0x%p)\n",
 215                                         handle);
 216                         winfo->sata_adr = dinfo->address;
 217                         winfo->obj_handle = handle;
 218                 }
 219         }
 220 out:
 221         kfree(dinfo);
 222 out2:
 223         kfree(pathname);
 224
 225 ret:
 226         return status;
 227 }
 228
 229 /* Get the SATA drive _ADR object. */
 230 static int get_sata_adr(struct device *dev, acpi_handle handle,
 231                         acpi_integer pcidevfn, unsigned int drive,
 232                         struct ata_port *ap,
 233                         struct ata_device *atadev, u32 *dev_adr)
 234 {
 235         acpi_status     status;
 236         struct walk_info *winfo;
 237         int             err = -ENOMEM;
 238
 239         winfo = kzalloc(sizeof(struct walk_info), GFP_KERNEL);
 240         if (!winfo)
 241                 goto out;
 242
 243         winfo->dev = dev;
 244         winfo->atadev = atadev;
 245         winfo->ataport = ap;
 246         if (acpi_bus_get_device(handle, &winfo->adev) < 0)
 247                 if (ata_msg_probe(ap))
 248                         ata_dev_printk(winfo->atadev, KERN_DEBUG,
 249                                 "acpi_bus_get_device failed\n");
 250         winfo->handle = handle;
 251         winfo->pcidevfn = pcidevfn;
 252         winfo->drivenum = drive;
 253
 254         status = acpi_get_devices(NULL, get_devices, winfo, NULL);
 255         if (ACPI_FAILURE(status)) {
 256                 if (ata_msg_probe(ap))
 257                         ata_dev_printk(winfo->atadev, KERN_DEBUG,
 258                                 "%s: acpi_get_devices failed\n",
 259                                 __FUNCTION__);
 260                 err = -ENODEV;
 261         } else {
 262                 *dev_adr = winfo->sata_adr;
 263                 atadev->obj_handle = winfo->obj_handle;
 264                 err = 0;
 265         }
 266         kfree(winfo);
 267 out:
 268         return err;
 269 }
 270
 271 /**
 272  * do_drive_get_GTF - get the drive bootup default taskfile settings
 273  * @ap: the ata_port for the drive
 274  * @ix: target ata_device (drive) index
 275  * @gtf_length: number of bytes of _GTF data returned at @gtf_address
 276  * @gtf_address: buffer containing _GTF taskfile arrays
 277  *
 278  * This applies to both PATA and SATA drives.
 279  *
 280  * The _GTF method has no input parameters.
 281  * It returns a variable number of register set values (registers
 282  * hex 1F1..1F7, taskfiles).
 283  * The <variable number> is not known in advance, so have ACPI-CA
 284  * allocate the buffer as needed and return it, then free it later.
 285  *
 286  * The returned @gtf_length and @gtf_address are only valid if the
 287  * function return value is 0.
 288  */
 289 static int do_drive_get_GTF(struct ata_port *ap, int ix,
 290                         unsigned int *gtf_length, unsigned long *gtf_address,
 291                         unsigned long *obj_loc)
 292 {
 293         acpi_status                     status;
 294         acpi_handle                     dev_handle = NULL;
 295         acpi_handle                     chan_handle, drive_handle;
 296         acpi_integer                    pcidevfn = 0;
 297         u32                             dev_adr;
 298         struct acpi_buffer              output;
 299         union acpi_object               *out_obj;
 300         struct device                   *dev = ap->host->dev;
 301         struct ata_device               *atadev = &ap->device[ix];
 302         int                             err = -ENODEV;
 303
 304         *gtf_length = 0;
 305         *gtf_address = 0UL;
 306         *obj_loc = 0UL;
 307
 308         if (libata_noacpi)
 309                 return 0;
 310
 311         if (ata_msg_probe(ap))
 312                 ata_dev_printk(atadev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
 313                                __FUNCTION__, ap->port_no);
 314
 315         if (!ata_dev_enabled(atadev) || (ap->flags & ATA_FLAG_DISABLED)) {
 316                 if (ata_msg_probe(ap))
 317                         ata_dev_printk(atadev, KERN_DEBUG, "%s: ERR: "
 318                                 "ata_dev_present: %d, PORT_DISABLED: %lu\n",
 319                                 __FUNCTION__, ata_dev_enabled(atadev),
 320                                 ap->flags & ATA_FLAG_DISABLED);
 321                 goto out;
 322         }
 323
 324         /* Don't continue if device has no _ADR method.
 325          * _GTF is intended for known motherboard devices. */
 326         if (!(ap->cbl == ATA_CBL_SATA)) {
 327                 err = pata_get_dev_handle(dev, &dev_handle, &pcidevfn);
 328                 if (err < 0) {
 329                         if (ata_msg_probe(ap))
 330                                 ata_dev_printk(atadev, KERN_DEBUG,
 331                                         "%s: pata_get_dev_handle failed (%d)\n",
 332                                         __FUNCTION__, err);
 333                         goto out;
 334                 }
 335         } else {
 336                 err = sata_get_dev_handle(dev, &dev_handle, &pcidevfn);
 337                 if (err < 0) {
 338                         if (ata_msg_probe(ap))
 339                                 ata_dev_printk(atadev, KERN_DEBUG,
 340                                         "%s: sata_get_dev_handle failed (%d\n",
 341                                         __FUNCTION__, err);
 342                         goto out;
 343                 }
 344         }
 345
 346         /* Get this drive's _ADR info. if not already known. */
 347         if (!atadev->obj_handle) {
 348                 if (!(ap->cbl == ATA_CBL_SATA)) {
 349                         /* get child objects of dev_handle == channel objects,
 350                          * + _their_ children == drive objects */
 351                         /* channel is ap->port_no */
 352                         chan_handle = acpi_get_child(dev_handle,
 353                                                 ap->port_no);
 354                         if (ata_msg_probe(ap))
 355                                 ata_dev_printk(atadev, KERN_DEBUG,
 356                                         "%s: chan adr=%d: chan_handle=0x%p\n",
 357                                         __FUNCTION__, ap->port_no,
 358                                         chan_handle);
 359                         if (!chan_handle) {
 360                                 err = -ENODEV;
 361                                 goto out;
 362                         }
 363                         /* TBD: could also check ACPI object VALID bits */
 364                         drive_handle = acpi_get_child(chan_handle, ix);
 365                         if (!drive_handle) {
 366                                 err = -ENODEV;
 367                                 goto out;
 368                         }
 369                         dev_adr = ix;
 370                         atadev->obj_handle = drive_handle;
 371                 } else {        /* for SATA mode */
 372                         dev_adr = SATA_ADR_RSVD;
 373                         err = get_sata_adr(dev, dev_handle, pcidevfn, 0,
 374                                         ap, atadev, &dev_adr);
 375                 }
 376                 if (err < 0 || dev_adr == SATA_ADR_RSVD ||
 377                     !atadev->obj_handle) {
 378                         if (ata_msg_probe(ap))
 379                                 ata_dev_printk(atadev, KERN_DEBUG,
 380                                         "%s: get_sata/pata_adr failed: "
 381                                         "err=%d, dev_adr=%u, obj_handle=0x%p\n",
 382                                         __FUNCTION__, err, dev_adr,
 383                                         atadev->obj_handle);
 384                         goto out;
 385                 }
 386         }
 387
 388         /* Setting up output buffer */
 389         output.length = ACPI_ALLOCATE_BUFFER;
 390         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 391
 392         /* _GTF has no input parameters */
 393         err = -EIO;
 394         status = acpi_evaluate_object(atadev->obj_handle, "_GTF",
 395                                         NULL, &output);
 396         if (ACPI_FAILURE(status)) {
 397                 if (ata_msg_probe(ap))
 398                         ata_dev_printk(atadev, KERN_DEBUG,
 399                                 "%s: Run _GTF error: status = 0x%x\n",
 400                                 __FUNCTION__, status);
 401                 goto out;
 402         }
 403
 404         if (!output.length || !output.pointer) {
 405                 if (ata_msg_probe(ap))
 406                         ata_dev_printk(atadev, KERN_DEBUG, "%s: Run _GTF: "
 407                                 "length or ptr is NULL (0x%llx, 0x%p)\n",
 408                                 __FUNCTION__,
 409                                 (unsigned long long)output.length,
 410                                 output.pointer);
 411                 kfree(output.pointer);
 412                 goto out;
 413         }
 414
 415         out_obj = output.pointer;
 416         if (out_obj->type != ACPI_TYPE_BUFFER) {
 417                 kfree(output.pointer);
 418                 if (ata_msg_probe(ap))
 419                         ata_dev_printk(atadev, KERN_DEBUG, "%s: Run _GTF: "
 420                                 "error: expected object type of "
 421                                 " ACPI_TYPE_BUFFER, got 0x%x\n",
 422                                 __FUNCTION__, out_obj->type);
 423                 err = -ENOENT;
 424                 goto out;
 425         }
 426
 427         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 428             out_obj->buffer.length % REGS_PER_GTF) {
 429                 if (ata_msg_drv(ap))
 430                         ata_dev_printk(atadev, KERN_ERR,
 431                                 "%s: unexpected GTF length (%d) or addr (0x%p)\n",
 432                                 __FUNCTION__, out_obj->buffer.length,
 433                                 out_obj->buffer.pointer);
 434                 err = -ENOENT;
 435                 goto out;
 436         }
 437
 438         *gtf_length = out_obj->buffer.length;
 439         *gtf_address = (unsigned long)out_obj->buffer.pointer;
 440         *obj_loc = (unsigned long)out_obj;
 441         if (ata_msg_probe(ap))
 442                 ata_dev_printk(atadev, KERN_DEBUG, "%s: returning "
 443                         "gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
 444                         __FUNCTION__, *gtf_length, *gtf_address, *obj_loc);
 445         err = 0;
 446 out:
 447         return err;
 448 }
 449
 450 /**
 451  * taskfile_load_raw - send taskfile registers to host controller
 452  * @ap: Port to which output is sent
 453  * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 454  *
 455  * Outputs ATA taskfile to standard ATA host controller using MMIO
 456  * or PIO as indicated by the ATA_FLAG_MMIO flag.
 457  * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
 458  * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
 459  * hob_lbal, hob_lbam, and hob_lbah.
 460  *
 461  * This function waits for idle (!BUSY and !DRQ) after writing
 462  * registers.  If the control register has a new value, this
 463  * function also waits for idle after writing control and before
 464  * writing the remaining registers.
 465  *
 466  * LOCKING: TBD:
 467  * Inherited from caller.
 468  */
 469 static void taskfile_load_raw(struct ata_port *ap,
 470                                 struct ata_device *atadev,
 471                                 const struct taskfile_array *gtf)
 472 {
 473         struct ata_taskfile tf;
 474         unsigned int err;
 475
 476         if (ata_msg_probe(ap))
 477                 ata_dev_printk(atadev, KERN_DEBUG, "%s: (0x1f1-1f7): hex: "
 478                         "%02x %02x %02x %02x %02x %02x %02x\n",
 479                         __FUNCTION__,
 480                         gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
 481                         gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
 482
 483         if ((gtf->tfa[0] == 0) && (gtf->tfa[1] == 0) && (gtf->tfa[2] == 0)
 484             && (gtf->tfa[3] == 0) && (gtf->tfa[4] == 0) && (gtf->tfa[5] == 0)
 485             && (gtf->tfa[6] == 0))
 486                 return;
 487
 488         ata_tf_init(atadev, &tf);
 489
 490         /* convert gtf to tf */
 491         tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; /* TBD */
 492         tf.protocol = atadev->class == ATA_DEV_ATAPI ?
 493                 ATA_PROT_ATAPI_NODATA : ATA_PROT_NODATA;
 494         tf.feature = gtf->tfa[0];       /* 0x1f1 */
 495         tf.nsect   = gtf->tfa[1];       /* 0x1f2 */
 496         tf.lbal    = gtf->tfa[2];       /* 0x1f3 */
 497         tf.lbam    = gtf->tfa[3];       /* 0x1f4 */
 498         tf.lbah    = gtf->tfa[4];       /* 0x1f5 */
 499         tf.device  = gtf->tfa[5];       /* 0x1f6 */
 500         tf.command = gtf->tfa[6];       /* 0x1f7 */
 501
 502         err = ata_exec_internal(atadev, &tf, NULL, DMA_NONE, NULL, 0);
 503         if (err && ata_msg_probe(ap))
 504                 ata_dev_printk(atadev, KERN_ERR,
 505                         "%s: ata_exec_internal failed: %u\n",
 506                         __FUNCTION__, err);
 507 }
 508
 509 /**
 510  * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 511  * @ap: the ata_port for the drive
 512  * @atadev: target ata_device
 513  * @gtf_length: total number of bytes of _GTF taskfiles
 514  * @gtf_address: location of _GTF taskfile arrays
 515  *
 516  * This applies to both PATA and SATA drives.
 517  *
 518  * Write {gtf_address, length gtf_length} in groups of
 519  * REGS_PER_GTF bytes.
 520  */
 521 static int do_drive_set_taskfiles(struct ata_port *ap,
 522                 struct ata_device *atadev, unsigned int gtf_length,
 523                 unsigned long gtf_address)
 524 {
 525         int                     err = -ENODEV;
 526         int                     gtf_count = gtf_length / REGS_PER_GTF;
 527         int                     ix;
 528         struct taskfile_array   *gtf;
 529
 530         if (ata_msg_probe(ap))
 531                 ata_dev_printk(atadev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
 532                                __FUNCTION__, ap->port_no);
 533
 534         if (libata_noacpi || !(ap->cbl == ATA_CBL_SATA))
 535                 return 0;
 536
 537         if (!ata_dev_enabled(atadev) || (ap->flags & ATA_FLAG_DISABLED))
 538                 goto out;
 539         if (!gtf_count)         /* shouldn't be here */
 540                 goto out;
 541
 542         if (gtf_length % REGS_PER_GTF) {
 543                 if (ata_msg_drv(ap))
 544                         ata_dev_printk(atadev, KERN_ERR,
 545                                 "%s: unexpected GTF length (%d)\n",
 546                                 __FUNCTION__, gtf_length);
 547                 goto out;
 548         }
 549
 550         for (ix = 0; ix < gtf_count; ix++) {
 551                 gtf = (struct taskfile_array *)
 552                         (gtf_address + ix * REGS_PER_GTF);
 553
 554                 /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
 555                 taskfile_load_raw(ap, atadev, gtf);
 556         }
 557
 558         err = 0;
 559 out:
 560         return err;
 561 }
 562
 563 /**
 564  * ata_acpi_exec_tfs - get then write drive taskfile settings
 565  * @ap: the ata_port for the drive
 566  *
 567  * This applies to both PATA and SATA drives.
 568  */
 569 int ata_acpi_exec_tfs(struct ata_port *ap)
 570 {
 571         int             ix;
 572         int             ret =0;
 573         unsigned int    gtf_length;
 574         unsigned long   gtf_address;
 575         unsigned long   obj_loc;
 576
 577         if (libata_noacpi)
 578                 return 0;
 579         /*
 580          * TBD - implement PATA support.  For now,
 581          * we should not run GTF on PATA devices since some
 582          * PATA require execution of GTM/STM before GTF.
 583          */
 584         if (!(ap->cbl == ATA_CBL_SATA))
 585                 return 0;
 586
 587         for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
 588                 if (!ata_dev_enabled(&ap->device[ix]))
 589                         continue;
 590
 591                 ret = do_drive_get_GTF(ap, ix,
 592                                 &gtf_length, &gtf_address, &obj_loc);
 593                 if (ret < 0) {
 594                         if (ata_msg_probe(ap))
 595                                 ata_port_printk(ap, KERN_DEBUG,
 596                                         "%s: get_GTF error (%d)\n",
 597                                         __FUNCTION__, ret);
 598                         break;
 599                 }
 600
 601                 ret = do_drive_set_taskfiles(ap, &ap->device[ix],
 602                                 gtf_length, gtf_address);
 603                 kfree((void *)obj_loc);
 604                 if (ret < 0) {
 605                         if (ata_msg_probe(ap))
 606                                 ata_port_printk(ap, KERN_DEBUG,
 607                                         "%s: set_taskfiles error (%d)\n",
 608                                         __FUNCTION__, ret);
 609                         break;
 610                 }
 611         }
 612
 613         return ret;
 614 }
 615
 616 /**
 617  * ata_acpi_push_id - send Identify data to drive
 618  * @ap: the ata_port for the drive
 619  * @ix: drive index
 620  *
 621  * _SDD ACPI object: for SATA mode only
 622  * Must be after Identify (Packet) Device -- uses its data
 623  * ATM this function never returns a failure.  It is an optional
 624  * method and if it fails for whatever reason, we should still
 625  * just keep going.
 626  */
 627 int ata_acpi_push_id(struct ata_port *ap, unsigned int ix)
 628 {
 629         acpi_handle                     handle;
 630         acpi_integer                    pcidevfn;
 631         int                             err;
 632         struct device                   *dev = ap->host->dev;
 633         struct ata_device               *atadev = &ap->device[ix];
 634         u32                             dev_adr;
 635         acpi_status                     status;
 636         struct acpi_object_list         input;
 637         union acpi_object               in_params[1];
 638
 639         if (libata_noacpi)
 640                 return 0;
 641
 642         if (ata_msg_probe(ap))
 643                 ata_dev_printk(atadev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
 644                                __FUNCTION__, ix, ap->port_no);
 645
 646         /* Don't continue if not a SATA device. */
 647         if (!(ap->cbl == ATA_CBL_SATA)) {
 648                 if (ata_msg_probe(ap))
 649                         ata_dev_printk(atadev, KERN_DEBUG,
 650                                 "%s: Not a SATA device\n", __FUNCTION__);
 651                 goto out;
 652         }
 653
 654         /* Don't continue if device has no _ADR method.
 655          * _SDD is intended for known motherboard devices. */
 656         err = sata_get_dev_handle(dev, &handle, &pcidevfn);
 657         if (err < 0) {
 658                 if (ata_msg_probe(ap))
 659                         ata_dev_printk(atadev, KERN_DEBUG,
 660                                 "%s: sata_get_dev_handle failed (%d\n",
 661                                 __FUNCTION__, err);
 662                 goto out;
 663         }
 664
 665         /* Get this drive's _ADR info, if not already known */
 666         if (!atadev->obj_handle) {
 667                 dev_adr = SATA_ADR_RSVD;
 668                 err = get_sata_adr(dev, handle, pcidevfn, ix, ap, atadev,
 669                                         &dev_adr);
 670                 if (err < 0 || dev_adr == SATA_ADR_RSVD ||
 671                         !atadev->obj_handle) {
 672                         if (ata_msg_probe(ap))
 673                                 ata_dev_printk(atadev, KERN_DEBUG,
 674                                         "%s: get_sata_adr failed: "
 675                                         "err=%d, dev_adr=%u, obj_handle=0x%p\n",
 676                                         __FUNCTION__, err, dev_adr,
 677                                         atadev->obj_handle);
 678                         goto out;
 679                 }
 680         }
 681
 682         /* Give the drive Identify data to the drive via the _SDD method */
 683         /* _SDD: set up input parameters */
 684         input.count = 1;
 685         input.pointer = in_params;
 686         in_params[0].type = ACPI_TYPE_BUFFER;
 687         in_params[0].buffer.length = sizeof(atadev->id[0]) * ATA_ID_WORDS;
 688         in_params[0].buffer.pointer = (u8 *)atadev->id;
 689         /* Output buffer: _SDD has no output */
 690
 691         /* It's OK for _SDD to be missing too. */
 692         swap_buf_le16(atadev->id, ATA_ID_WORDS);
 693         status = acpi_evaluate_object(atadev->obj_handle, "_SDD", &input, NULL);
 694         swap_buf_le16(atadev->id, ATA_ID_WORDS);
 695
 696         err = ACPI_FAILURE(status) ? -EIO : 0;
 697         if (err < 0) {
 698                 if (ata_msg_probe(ap))
 699                         ata_dev_printk(atadev, KERN_DEBUG,
 700                                        "%s _SDD error: status = 0x%x\n",
 701                                        __FUNCTION__, status);
 702         }
 703
 704         /* always return success */
 705 out:
 706         return 0;
 707 }
 708
 709