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libata-acpi: implement _GTM/_STM support

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Implement _GTM/_STM support.  acpi_gtm is added to ata_port which
stores _GTM parameters over suspend/resume cycle.  A new hook
ata_acpi_on_suspend() is responsible for storing _GTM parameters
during suspend.  _STM is executed in ata_acpi_on_resume().  With this
change, invoking _GTF is safe on IDE hierarchy and acpi_sata check
before _GTF is removed.

ata_acpi_gtm() and ata_acpi_stm() implementation is taken from Alan
Cox's pata_acpi implementation.  ata_acpi_gtm() is fixed such that the
result parameter is not shifted by sizeof(union acpi_object).

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2007-05-15 03:28:16 +09:00
committed by Jeff Garzik
parent e5fa24dfdb
commit 64578a3de7
4 changed files with 171 additions and 5 deletions
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153
drivers/ata/libata-acpi.c
View File

@ -100,6 +100,108 @@ void ata_acpi_associate(struct ata_host *host)
}
}
/**
* ata_acpi_gtm - execute _GTM
* @ap: target ATA port
* @gtm: out parameter for _GTM result
*
* Evaluate _GTM and store the result in @gtm.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure.
*/
static int ata_acpi_gtm(const struct ata_port *ap, struct ata_acpi_gtm *gtm)
{
struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER };
union acpi_object *out_obj;
acpi_status status;
int rc = 0;
status = acpi_evaluate_object(ap->acpi_handle, "_GTM", NULL, &output);
rc = -ENOENT;
if (status == AE_NOT_FOUND)
goto out_free;
rc = -EINVAL;
if (ACPI_FAILURE(status)) {
ata_port_printk(ap, KERN_ERR,
"ACPI get timing mode failed (AE 0x%x)\n",
status);
goto out_free;
}
out_obj = output.pointer;
if (out_obj->type != ACPI_TYPE_BUFFER) {
ata_port_printk(ap, KERN_WARNING,
"_GTM returned unexpected object type 0x%x\n",
out_obj->type);
goto out_free;
}
if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) {
ata_port_printk(ap, KERN_ERR,
"_GTM returned invalid length %d\n",
out_obj->buffer.length);
goto out_free;
}
memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm));
rc = 0;
out_free:
kfree(output.pointer);
return rc;
}
/**
* ata_acpi_stm - execute _STM
* @ap: target ATA port
* @stm: timing parameter to _STM
*
* Evaluate _STM with timing parameter @stm.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -ENOENT if _STM doesn't exist, -errno on failure.
*/
static int ata_acpi_stm(const struct ata_port *ap, struct ata_acpi_gtm *stm)
{
acpi_status status;
struct acpi_object_list input;
union acpi_object in_params[3];
in_params[0].type = ACPI_TYPE_BUFFER;
in_params[0].buffer.length = sizeof(struct ata_acpi_gtm);
in_params[0].buffer.pointer = (u8 *)stm;
/* Buffers for id may need byteswapping ? */
in_params[1].type = ACPI_TYPE_BUFFER;
in_params[1].buffer.length = 512;
in_params[1].buffer.pointer = (u8 *)ap->device[0].id;
in_params[2].type = ACPI_TYPE_BUFFER;
in_params[2].buffer.length = 512;
in_params[2].buffer.pointer = (u8 *)ap->device[1].id;
input.count = 3;
input.pointer = in_params;
status = acpi_evaluate_object(ap->acpi_handle, "_STM", &input, NULL);
if (status == AE_NOT_FOUND)
return -ENOENT;
if (ACPI_FAILURE(status)) {
ata_port_printk(ap, KERN_ERR,
"ACPI set timing mode failed (status=0x%x)\n", status);
return -EINVAL;
}
return 0;
}
/**
* ata_dev_get_GTF - get the drive bootup default taskfile settings
* @dev: target ATA device
@ -354,6 +456,46 @@ static int ata_acpi_push_id(struct ata_device *dev)
return err;
}
/**
* ata_acpi_on_suspend - ATA ACPI hook called on suspend
* @ap: target ATA port
*
* This function is called when @ap is about to be suspended. All
* devices are already put to sleep but the port_suspend() callback
* hasn't been executed yet. Error return from this function aborts
* suspend.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int ata_acpi_on_suspend(struct ata_port *ap)
{
unsigned long flags;
int rc;
/* proceed iff per-port acpi_handle is valid */
if (!ap->acpi_handle)
return 0;
BUG_ON(ap->flags & ATA_FLAG_ACPI_SATA);
/* store timing parameters */
rc = ata_acpi_gtm(ap, &ap->acpi_gtm);
spin_lock_irqsave(ap->lock, flags);
if (rc == 0)
ap->pflags |= ATA_PFLAG_GTM_VALID;
else
ap->pflags &= ~ATA_PFLAG_GTM_VALID;
spin_unlock_irqrestore(ap->lock, flags);
if (rc == -ENOENT)
rc = 0;
return rc;
}
/**
* ata_acpi_on_resume - ATA ACPI hook called on resume
* @ap: target ATA port
@ -368,6 +510,13 @@ void ata_acpi_on_resume(struct ata_port *ap)
{
int i;
if (ap->acpi_handle && (ap->pflags & ATA_PFLAG_GTM_VALID)) {
BUG_ON(ap->flags & ATA_FLAG_ACPI_SATA);
/* restore timing parameters */
ata_acpi_stm(ap, &ap->acpi_gtm);
}
/* schedule _GTF */
for (i = 0; i < ATA_MAX_DEVICES; i++)
ap->device[i].flags |= ATA_DFLAG_ACPI_PENDING;
@ -394,10 +543,6 @@ int ata_acpi_on_devcfg(struct ata_device *dev)
int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
int rc;
/* XXX: _STM isn't implemented yet, skip if IDE for now */
if (!acpi_sata)
return 0;
if (!dev->acpi_handle)
return 0;