diff options
| author | Tejun Heo <htejun@gmail.com> | 2006-05-15 20:57:46 +0900 |
|---|---|---|
| committer | Tejun Heo <htejun@gmail.com> | 2006-05-15 20:57:46 +0900 |
| commit | 34bf21704c848fe00c516d1c8f163db08b70b137 (patch) | |
| tree | 8482de3ddf6ff1b02ff9ddfd027d2478c7ecd7ac /include | |
| parent | 838df6284c54447efae956fb9c243d8ba4ab0f47 (diff) | |
| download | linux-34bf21704c848fe00c516d1c8f163db08b70b137.tar.gz | |
[PATCH] libata: implement new SCR handling and port on/offline functions
Implement ata_scr_{valid|read|write|write_flush}() and
ata_port_{online|offline}(). These functions replace
scr_{read|write}() and sata_dev_present().
Major difference between between the new SCR functions and the old
ones is that the new ones have a way to signal error to the caller.
This makes handling SCR-available and SCR-unavailable cases in the
same path easier. Also, it eases later PM implementation where SCR
access can fail due to various reasons.
ata_port_{online|offline}() functions return 1 only when they are
affirmitive of the condition. e.g. if SCR is unaccessible or
presence cannot be determined for other reasons, these functions
return 0. So, ata_port_online() != !ata_port_offline(). This
distinction is useful in many exception handling cases.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/libata.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h index a4b8a419caad2..47b97157995dc 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -536,6 +536,12 @@ extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg); extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)); extern int ata_scsi_release(struct Scsi_Host *host); extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc); +extern int sata_scr_valid(struct ata_port *ap); +extern int sata_scr_read(struct ata_port *ap, int reg, u32 *val); +extern int sata_scr_write(struct ata_port *ap, int reg, u32 val); +extern int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val); +extern int ata_port_online(struct ata_port *ap); +extern int ata_port_offline(struct ata_port *ap); extern int ata_scsi_device_resume(struct scsi_device *); extern int ata_scsi_device_suspend(struct scsi_device *, pm_message_t state); extern int ata_device_resume(struct ata_port *, struct ata_device *); |