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ide-acpi.c

/*
 * ide-acpi.c
 * Provides ACPI support for IDE drives.
 *
 * Copyright (C) 2005 Intel Corp.
 * Copyright (C) 2005 Randy Dunlap
 * Copyright (C) 2006 SUSE Linux Products GmbH
 * Copyright (C) 2006 Hannes Reinecke
 */

#include <linux/ata.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <acpi/acpi.h>
#include <linux/ide.h>
#include <linux/pci.h>
#include <linux/dmi.h>

#include <acpi/acpi_bus.h>
#include <acpi/acnames.h>
#include <acpi/acnamesp.h>
#include <acpi/acparser.h>
#include <acpi/acexcep.h>
#include <acpi/acmacros.h>
#include <acpi/actypes.h>

#define REGS_PER_GTF          7
struct taskfile_array {
      u8    tfa[REGS_PER_GTF];      /* regs. 0x1f1 - 0x1f7 */
};

struct GTM_buffer {
      u32   PIO_speed0;
      u32   DMA_speed0;
      u32   PIO_speed1;
      u32   DMA_speed1;
      u32   GTM_flags;
};

struct ide_acpi_drive_link {
      ide_drive_t *drive;
      acpi_handle  obj_handle;
      u8           idbuff[512];
};

struct ide_acpi_hwif_link {
      ide_hwif_t              *hwif;
      acpi_handle              obj_handle;
      struct GTM_buffer        gtm;
      struct ide_acpi_drive_link     master;
      struct ide_acpi_drive_link     slave;
};

#undef DEBUGGING
/* note: adds function name and KERN_DEBUG */
#ifdef DEBUGGING
#define DEBPRINT(fmt, args...)      \
            printk(KERN_DEBUG "%s: " fmt, __FUNCTION__, ## args)
#else
#define DEBPRINT(fmt, args...)      do {} while (0)
#endif      /* DEBUGGING */

extern int ide_noacpi;
extern int ide_noacpitfs;
extern int ide_noacpionboot;

static bool ide_noacpi_psx;
static int no_acpi_psx(const struct dmi_system_id *id)
{
      ide_noacpi_psx = true;
      printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident);
      return 0;
}

static const struct dmi_system_id ide_acpi_dmi_table[] = {
      /* Bug 9673. */
      /* We should check if this is because ACPI NVS isn't save/restored. */
      {
            .callback = no_acpi_psx,
            .ident    = "HP nx9005",
            .matches  = {
                  DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."),
                  DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60")
            },
      },

      { }   /* terminate list */
};

static int ide_acpi_blacklist(void)
{
      static int done;
      if (done)
            return 0;
      done = 1;
      dmi_check_system(ide_acpi_dmi_table);
      return 0;
}

/**
 * ide_get_dev_handle - finds acpi_handle and PCI device.function
 * @dev: device to locate
 * @handle: returned acpi_handle for @dev
 * @pcidevfn: return PCI device.func for @dev
 *
 * Returns the ACPI object handle to the corresponding PCI device.
 *
 * Returns 0 on success, <0 on error.
 */
static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
                         acpi_integer *pcidevfn)
{
      struct pci_dev *pdev = to_pci_dev(dev);
      unsigned int bus, devnum, func;
      acpi_integer addr;
      acpi_handle dev_handle;
      struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
                              .pointer = NULL};
      acpi_status status;
      struct acpi_device_info *dinfo = NULL;
      int ret = -ENODEV;

      bus = pdev->bus->number;
      devnum = PCI_SLOT(pdev->devfn);
      func = PCI_FUNC(pdev->devfn);
      /* ACPI _ADR encoding for PCI bus: */
      addr = (acpi_integer)(devnum << 16 | func);

      DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func);

      dev_handle = DEVICE_ACPI_HANDLE(dev);
      if (!dev_handle) {
            DEBPRINT("no acpi handle for device\n");
            goto err;
      }

      status = acpi_get_object_info(dev_handle, &buffer);
      if (ACPI_FAILURE(status)) {
            DEBPRINT("get_object_info for device failed\n");
            goto err;
      }
      dinfo = buffer.pointer;
      if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
          dinfo->address == addr) {
            *pcidevfn = addr;
            *handle = dev_handle;
      } else {
            DEBPRINT("get_object_info for device has wrong "
                  " address: %llu, should be %u\n",
                  dinfo ? (unsigned long long)dinfo->address : -1ULL,
                  (unsigned int)addr);
            goto err;
      }

      DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n",
             devnum, func, (unsigned long long)addr, *handle);
      ret = 0;
err:
      kfree(dinfo);
      return ret;
}

/**
 * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif
 * @hwif: device to locate
 *
 * Retrieves the object handle for a given hwif.
 *
 * Returns handle on success, 0 on error.
 */
static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif)
{
      struct device           *dev = hwif->gendev.parent;
      acpi_handle       dev_handle;
      acpi_integer            pcidevfn;
      acpi_handle       chan_handle;
      int               err;

      DEBPRINT("ENTER: device %s\n", hwif->name);

      if (!dev) {
            DEBPRINT("no PCI device for %s\n", hwif->name);
            return NULL;
      }

      err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn);
      if (err < 0) {
            DEBPRINT("ide_get_dev_handle failed (%d)\n", err);
            return NULL;
      }

      /* get child objects of dev_handle == channel objects,
       * + _their_ children == drive objects */
      /* channel is hwif->channel */
      chan_handle = acpi_get_child(dev_handle, hwif->channel);
      DEBPRINT("chan adr=%d: handle=0x%p\n",
             hwif->channel, chan_handle);

      return chan_handle;
}

/**
 * ide_acpi_drive_get_handle - Get ACPI object handle for a given drive
 * @drive: device to locate
 *
 * Retrieves the object handle of a given drive. According to the ACPI
 * spec the drive is a child of the hwif.
 *
 * Returns handle on success, 0 on error.
 */
static acpi_handle ide_acpi_drive_get_handle(ide_drive_t *drive)
{
      ide_hwif_t  *hwif = HWIF(drive);
      int          port;
      acpi_handle  drive_handle;

      if (!hwif->acpidata)
            return NULL;

      if (!hwif->acpidata->obj_handle)
            return NULL;

      port = hwif->channel ? drive->dn - 2: drive->dn;

      DEBPRINT("ENTER: %s at channel#: %d port#: %d\n",
             drive->name, hwif->channel, port);


      /* TBD: could also check ACPI object VALID bits */
      drive_handle = acpi_get_child(hwif->acpidata->obj_handle, port);
      DEBPRINT("drive %s handle 0x%p\n", drive->name, drive_handle);

      return drive_handle;
}

/**
 * do_drive_get_GTF - get the drive bootup default taskfile settings
 * @drive: the drive for which the taskfile settings should be retrieved
 * @gtf_length: number of bytes of _GTF data returned at @gtf_address
 * @gtf_address: buffer containing _GTF taskfile arrays
 *
 * The _GTF method has no input parameters.
 * It returns a variable number of register set values (registers
 * hex 1F1..1F7, taskfiles).
 * The <variable number> is not known in advance, so have ACPI-CA
 * allocate the buffer as needed and return it, then free it later.
 *
 * The returned @gtf_length and @gtf_address are only valid if the
 * function return value is 0.
 */
static int do_drive_get_GTF(ide_drive_t *drive,
                 unsigned int *gtf_length, unsigned long *gtf_address,
                 unsigned long *obj_loc)
{
      acpi_status             status;
      struct acpi_buffer            output;
      union acpi_object             *out_obj;
      ide_hwif_t              *hwif = HWIF(drive);
      struct device                 *dev = hwif->gendev.parent;
      int                     err = -ENODEV;
      int                     port;

      *gtf_length = 0;
      *gtf_address = 0UL;
      *obj_loc = 0UL;

      if (ide_noacpi)
            return 0;

      if (!dev) {
            DEBPRINT("no PCI device for %s\n", hwif->name);
            goto out;
      }

      if (!hwif->acpidata) {
            DEBPRINT("no ACPI data for %s\n", hwif->name);
            goto out;
      }

      port = hwif->channel ? drive->dn - 2: drive->dn;

      if (!drive->acpidata) {
            if (port == 0) {
                  drive->acpidata = &hwif->acpidata->master;
                  hwif->acpidata->master.drive = drive;
            } else {
                  drive->acpidata = &hwif->acpidata->slave;
                  hwif->acpidata->slave.drive = drive;
            }
      }

      DEBPRINT("ENTER: %s at %s, port#: %d, hard_port#: %d\n",
             hwif->name, dev->bus_id, port, hwif->channel);

      if (!drive->present) {
            DEBPRINT("%s drive %d:%d not present\n",
                   hwif->name, hwif->channel, port);
            goto out;
      }

      /* Get this drive's _ADR info. if not already known. */
      if (!drive->acpidata->obj_handle) {
            drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);
            if (!drive->acpidata->obj_handle) {
                  DEBPRINT("No ACPI object found for %s\n",
                         drive->name);
                  goto out;
            }
      }

      /* Setting up output buffer */
      output.length = ACPI_ALLOCATE_BUFFER;
      output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */

      /* _GTF has no input parameters */
      err = -EIO;
      status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF",
                              NULL, &output);
      if (ACPI_FAILURE(status)) {
            printk(KERN_DEBUG
                   "%s: Run _GTF error: status = 0x%x\n",
                   __FUNCTION__, status);
            goto out;
      }

      if (!output.length || !output.pointer) {
            DEBPRINT("Run _GTF: "
                   "length or ptr is NULL (0x%llx, 0x%p)\n",
                   (unsigned long long)output.length,
                   output.pointer);
            goto out;
      }

      out_obj = output.pointer;
      if (out_obj->type != ACPI_TYPE_BUFFER) {
            DEBPRINT("Run _GTF: error: "
                   "expected object type of ACPI_TYPE_BUFFER, "
                   "got 0x%x\n", out_obj->type);
            err = -ENOENT;
            kfree(output.pointer);
            goto out;
      }

      if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
          out_obj->buffer.length % REGS_PER_GTF) {
            printk(KERN_ERR
                   "%s: unexpected GTF length (%d) or addr (0x%p)\n",
                   __FUNCTION__, out_obj->buffer.length,
                   out_obj->buffer.pointer);
            err = -ENOENT;
            kfree(output.pointer);
            goto out;
      }

      *gtf_length = out_obj->buffer.length;
      *gtf_address = (unsigned long)out_obj->buffer.pointer;
      *obj_loc = (unsigned long)out_obj;
      DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
             *gtf_length, *gtf_address, *obj_loc);
      err = 0;
out:
      return err;
}

/**
 * taskfile_load_raw - send taskfile registers to drive
 * @drive: drive to which output is sent
 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 *
 * Outputs IDE taskfile to the drive.
 */
static int taskfile_load_raw(ide_drive_t *drive,
                        const struct taskfile_array *gtf)
{
      ide_task_t args;
      int err = 0;

      DEBPRINT("(0x1f1-1f7): hex: "
             "%02x %02x %02x %02x %02x %02x %02x\n",
             gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
             gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);

      memset(&args, 0, sizeof(ide_task_t));
      args.command_type = IDE_DRIVE_TASK_NO_DATA;
      args.data_phase   = TASKFILE_NO_DATA;
      args.handler      = &task_no_data_intr;

      /* convert gtf to IDE Taskfile */
      args.tfRegister[1] = gtf->tfa[0];   /* 0x1f1 */
      args.tfRegister[2] = gtf->tfa[1];   /* 0x1f2 */
      args.tfRegister[3] = gtf->tfa[2];   /* 0x1f3 */
      args.tfRegister[4] = gtf->tfa[3];   /* 0x1f4 */
      args.tfRegister[5] = gtf->tfa[4];   /* 0x1f5 */
      args.tfRegister[6] = gtf->tfa[5];   /* 0x1f6 */
      args.tfRegister[7] = gtf->tfa[6];   /* 0x1f7 */

      if (ide_noacpitfs) {
            DEBPRINT("_GTF execution disabled\n");
            return err;
      }

      err = ide_raw_taskfile(drive, &args, NULL);
      if (err)
            printk(KERN_ERR "%s: ide_raw_taskfile failed: %u\n",
                   __FUNCTION__, err);

      return err;
}

/**
 * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 * @drive: the drive to which the taskfile command should be sent
 * @gtf_length: total number of bytes of _GTF taskfiles
 * @gtf_address: location of _GTF taskfile arrays
 *
 * Write {gtf_address, length gtf_length} in groups of
 * REGS_PER_GTF bytes.
 */
static int do_drive_set_taskfiles(ide_drive_t *drive,
                          unsigned int gtf_length,
                          unsigned long gtf_address)
{
      int               rc = -ENODEV, err;
      int               gtf_count = gtf_length / REGS_PER_GTF;
      int               ix;
      struct taskfile_array   *gtf;

      if (ide_noacpi)
            return 0;

      DEBPRINT("ENTER: %s, hard_port#: %d\n", drive->name, drive->dn);

      if (!drive->present)
            goto out;
      if (!gtf_count)         /* shouldn't be here */
            goto out;

      DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
             gtf_length, gtf_length, gtf_count, gtf_address);

      if (gtf_length % REGS_PER_GTF) {
            printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
                   __FUNCTION__, gtf_length);
            goto out;
      }

      rc = 0;
      for (ix = 0; ix < gtf_count; ix++) {
            gtf = (struct taskfile_array *)
                  (gtf_address + ix * REGS_PER_GTF);

            /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
            err = taskfile_load_raw(drive, gtf);
            if (err)
                  rc = err;
      }

out:
      return rc;
}

/**
 * ide_acpi_exec_tfs - get then write drive taskfile settings
 * @drive: the drive for which the taskfile settings should be
 *         written.
 *
 * According to the ACPI spec this should be called after _STM
 * has been evaluated for the interface. Some ACPI vendors interpret
 * that as a hard requirement and modify the taskfile according
 * to the Identify Drive information passed down with _STM.
 * So one should really make sure to call this only after _STM has
 * been executed.
 */
int ide_acpi_exec_tfs(ide_drive_t *drive)
{
      int         ret;
      unsigned int      gtf_length;
      unsigned long     gtf_address;
      unsigned long     obj_loc;

      if (ide_noacpi)
            return 0;

      DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);

      ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
      if (ret < 0) {
            DEBPRINT("get_GTF error (%d)\n", ret);
            return ret;
      }

      DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);

      ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
      kfree((void *)obj_loc);
      if (ret < 0) {
            DEBPRINT("set_taskfiles error (%d)\n", ret);
      }

      DEBPRINT("ret=%d\n", ret);

      return ret;
}
EXPORT_SYMBOL_GPL(ide_acpi_exec_tfs);

/**
 * ide_acpi_get_timing - get the channel (controller) timings
 * @hwif: target IDE interface (channel)
 *
 * This function executes the _GTM ACPI method for the target channel.
 *
 */
void ide_acpi_get_timing(ide_hwif_t *hwif)
{
      acpi_status       status;
      struct acpi_buffer      output;
      union acpi_object       *out_obj;

      if (ide_noacpi)
            return;

      DEBPRINT("ENTER:\n");

      if (!hwif->acpidata) {
            DEBPRINT("no ACPI data for %s\n", hwif->name);
            return;
      }

      /* Setting up output buffer for _GTM */
      output.length = ACPI_ALLOCATE_BUFFER;
      output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */

      /* _GTM has no input parameters */
      status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
                              NULL, &output);

      DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
             status, output.pointer,
             (unsigned long long)output.length);

      if (ACPI_FAILURE(status)) {
            DEBPRINT("Run _GTM error: status = 0x%x\n", status);
            return;
      }

      if (!output.length || !output.pointer) {
            DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
                   (unsigned long long)output.length,
                   output.pointer);
            kfree(output.pointer);
            return;
      }

      out_obj = output.pointer;
      if (out_obj->type != ACPI_TYPE_BUFFER) {
            kfree(output.pointer);
            DEBPRINT("Run _GTM: error: "
                   "expected object type of ACPI_TYPE_BUFFER, "
                   "got 0x%x\n", out_obj->type);
            return;
      }

      if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
          out_obj->buffer.length != sizeof(struct GTM_buffer)) {
            kfree(output.pointer);
            printk(KERN_ERR
                  "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
                  "addr (0x%p)\n",
                  __FUNCTION__, out_obj->buffer.length,
                  sizeof(struct GTM_buffer), out_obj->buffer.pointer);
            return;
      }

      memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
             sizeof(struct GTM_buffer));

      DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
             out_obj->buffer.pointer, out_obj->buffer.length,
             sizeof(struct GTM_buffer));

      DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
             hwif->acpidata->gtm.PIO_speed0,
             hwif->acpidata->gtm.DMA_speed0,
             hwif->acpidata->gtm.PIO_speed1,
             hwif->acpidata->gtm.DMA_speed1,
             hwif->acpidata->gtm.GTM_flags);

      kfree(output.pointer);
}
EXPORT_SYMBOL_GPL(ide_acpi_get_timing);

/**
 * ide_acpi_push_timing - set the channel (controller) timings
 * @hwif: target IDE interface (channel)
 *
 * This function executes the _STM ACPI method for the target channel.
 *
 * _STM requires Identify Drive data, which has to passed as an argument.
 * Unfortunately hd_driveid is a mangled version which we can't readily
 * use; hence we'll get the information afresh.
 */
void ide_acpi_push_timing(ide_hwif_t *hwif)
{
      acpi_status       status;
      struct acpi_object_list input;
      union acpi_object       in_params[3];
      struct ide_acpi_drive_link    *master = &hwif->acpidata->master;
      struct ide_acpi_drive_link    *slave = &hwif->acpidata->slave;

      if (ide_noacpi)
            return;

      DEBPRINT("ENTER:\n");

      if (!hwif->acpidata) {
            DEBPRINT("no ACPI data for %s\n", hwif->name);
            return;
      }

      /* Give the GTM buffer + drive Identify data to the channel via the
       * _STM method: */
      /* setup input parameters buffer for _STM */
      input.count = 3;
      input.pointer = in_params;
      in_params[0].type = ACPI_TYPE_BUFFER;
      in_params[0].buffer.length = sizeof(struct GTM_buffer);
      in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
      in_params[1].type = ACPI_TYPE_BUFFER;
      in_params[1].buffer.length = sizeof(struct hd_driveid);
      in_params[1].buffer.pointer = (u8 *)&master->idbuff;
      in_params[2].type = ACPI_TYPE_BUFFER;
      in_params[2].buffer.length = sizeof(struct hd_driveid);
      in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
      /* Output buffer: _STM has no output */

      status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
                              &input, NULL);

      if (ACPI_FAILURE(status)) {
            DEBPRINT("Run _STM error: status = 0x%x\n", status);
      }
      DEBPRINT("_STM status: %d\n", status);
}
EXPORT_SYMBOL_GPL(ide_acpi_push_timing);

/**
 * ide_acpi_set_state - set the channel power state
 * @hwif: target IDE interface
 * @on: state, on/off
 *
 * This function executes the _PS0/_PS3 ACPI method to set the power state.
 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
 */
void ide_acpi_set_state(ide_hwif_t *hwif, int on)
{
      int unit;

      if (ide_noacpi || ide_noacpi_psx)
            return;

      DEBPRINT("ENTER:\n");

      if (!hwif->acpidata) {
            DEBPRINT("no ACPI data for %s\n", hwif->name);
            return;
      }
      /* channel first and then drives for power on and verse versa for power off */
      if (on)
            acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
      for (unit = 0; unit < MAX_DRIVES; ++unit) {
            ide_drive_t *drive = &hwif->drives[unit];

            if (!drive->acpidata->obj_handle)
                  drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);

            if (drive->acpidata->obj_handle && drive->present) {
                  acpi_bus_set_power(drive->acpidata->obj_handle,
                        on? ACPI_STATE_D0: ACPI_STATE_D3);
            }
      }
      if (!on)
            acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
}

/**
 * ide_acpi_init - initialize the ACPI link for an IDE interface
 * @hwif: target IDE interface (channel)
 *
 * The ACPI spec is not quite clear when the drive identify buffer
 * should be obtained. Calling IDENTIFY DEVICE during shutdown
 * is not the best of ideas as the drive might already being put to
 * sleep. And obviously we can't call it during resume.
 * So we get the information during startup; but this means that
 * any changes during run-time will be lost after resume.
 */
void ide_acpi_init(ide_hwif_t *hwif)
{
      int unit;
      int               err;
      struct ide_acpi_drive_link    *master;
      struct ide_acpi_drive_link    *slave;

      ide_acpi_blacklist();

      hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
      if (!hwif->acpidata)
            return;

      hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
      if (!hwif->acpidata->obj_handle) {
            DEBPRINT("no ACPI object for %s found\n", hwif->name);
            kfree(hwif->acpidata);
            hwif->acpidata = NULL;
            return;
      }

      /*
       * The ACPI spec mandates that we send information
       * for both drives, regardless whether they are connected
       * or not.
       */
      hwif->acpidata->master.drive = &hwif->drives[0];
      hwif->drives[0].acpidata = &hwif->acpidata->master;
      master = &hwif->acpidata->master;

      hwif->acpidata->slave.drive = &hwif->drives[1];
      hwif->drives[1].acpidata = &hwif->acpidata->slave;
      slave = &hwif->acpidata->slave;


      /*
       * Send IDENTIFY for each drive
       */
      if (master->drive->present) {
            err = taskfile_lib_get_identify(master->drive, master->idbuff);
            if (err) {
                  DEBPRINT("identify device %s failed (%d)\n",
                         master->drive->name, err);
            }
      }

      if (slave->drive->present) {
            err = taskfile_lib_get_identify(slave->drive, slave->idbuff);
            if (err) {
                  DEBPRINT("identify device %s failed (%d)\n",
                         slave->drive->name, err);
            }
      }

      if (ide_noacpionboot) {
            DEBPRINT("ACPI methods disabled on boot\n");
            return;
      }

      /* ACPI _PS0 before _STM */
      ide_acpi_set_state(hwif, 1);
      /*
       * ACPI requires us to call _STM on startup
       */
      ide_acpi_get_timing(hwif);
      ide_acpi_push_timing(hwif);

      for (unit = 0; unit < MAX_DRIVES; ++unit) {
            ide_drive_t *drive = &hwif->drives[unit];

            if (drive->present) {
                  /* Execute ACPI startup code */
                  ide_acpi_exec_tfs(drive);
            }
      }
}
EXPORT_SYMBOL_GPL(ide_acpi_init);

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