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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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13
include/linux/libata.h
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@ -198,6 +198,7 @@ enum {
ATA_PFLAG_FLUSH_PORT_TASK = (1 << 16), /* flush port task */
ATA_PFLAG_SUSPENDED = (1 << 17), /* port is suspended (power) */
ATA_PFLAG_PM_PENDING = (1 << 18), /* PM operation pending */
ATA_PFLAG_GTM_VALID = (1 << 19), /* acpi_gtm data valid */
/* struct ata_queued_cmd flags */
ATA_QCFLAG_ACTIVE = (1 << 0), /* cmd not yet ack'd to scsi lyer */
@ -493,6 +494,17 @@ struct ata_eh_context {
unsigned int did_probe_mask;
};
struct ata_acpi_drive
{
u32 pio;
u32 dma;
} __packed;
struct ata_acpi_gtm {
struct ata_acpi_drive drive[2];
u32 flags;
} __packed;
struct ata_port {
struct Scsi_Host *scsi_host; /* our co-allocated scsi host */
const struct ata_port_operations *ops;
@ -555,6 +567,7 @@ struct ata_port {
#ifdef CONFIG_ATA_ACPI
acpi_handle acpi_handle;
struct ata_acpi_gtm acpi_gtm;
#endif
u8 sector_buf[ATA_SECT_SIZE]; /* owned by EH */
};