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authorJeff Garzik <jgarzik@pobox.com>2005-05-30 15:41:05 -0400
committerJeff Garzik <jgarzik@pobox.com>2005-05-30 15:41:05 -0400
commit780a87f71841932db8dbb0f1eb9daf3a973a6bd6 (patch)
tree443bad8a11c4502785265578e7a424ca3c67326a /drivers/scsi/libata-core.c
parent07dd39b9f62e0532c6922459c3a26d54a07bc231 (diff)
libata: more doc updates
Document recently-added ata_port_operations hooks. Fill several doc stubs in libata-core.c.
Diffstat (limited to 'drivers/scsi/libata-core.c')
-rw-r--r--drivers/scsi/libata-core.c57
1 files changed, 44 insertions, 13 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 63d3f70d06e1..4d707d06a5d1 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1241,10 +1241,14 @@ void ata_port_probe(struct ata_port *ap)
}
/**
- * __sata_phy_reset -
- * @ap:
+ * __sata_phy_reset - Wake/reset a low-level SATA PHY
+ * @ap: SATA port associated with target SATA PHY.
*
- * LOCKING:
+ * This function issues commands to standard SATA Sxxx
+ * PHY registers, to wake up the phy (and device), and
+ * clear any reset condition.
+ *
+ * LOCKING: None. Serialized during ata_bus_probe().
*
*/
void __sata_phy_reset(struct ata_port *ap)
@@ -1289,10 +1293,13 @@ void __sata_phy_reset(struct ata_port *ap)
}
/**
- * __sata_phy_reset -
- * @ap:
+ * sata_phy_reset - Reset SATA bus.
+ * @ap: SATA port associated with target SATA PHY.
*
- * LOCKING:
+ * This function resets the SATA bus, and then probes
+ * the bus for devices.
+ *
+ * LOCKING: None. Serialized during ata_bus_probe().
*
*/
void sata_phy_reset(struct ata_port *ap)
@@ -1304,10 +1311,16 @@ void sata_phy_reset(struct ata_port *ap)
}
/**
- * ata_port_disable -
- * @ap:
+ * ata_port_disable - Disable port.
+ * @ap: Port to be disabled.
*
- * LOCKING:
+ * Modify @ap data structure such that the system
+ * thinks that the entire port is disabled, and should
+ * never attempt to probe or communicate with devices
+ * on this port.
+ *
+ * LOCKING: host_set lock, or some other form of
+ * serialization.
*/
void ata_port_disable(struct ata_port *ap)
@@ -1416,7 +1429,9 @@ static void ata_host_set_dma(struct ata_port *ap, u8 xfer_mode,
* ata_set_mode - Program timings and issue SET FEATURES - XFER
* @ap: port on which timings will be programmed
*
- * LOCKING:
+ * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
+ *
+ * LOCKING: None. Serialized during ata_bus_probe().
*
*/
static void ata_set_mode(struct ata_port *ap)
@@ -1467,7 +1482,10 @@ err_out:
* @tmout_pat: impatience timeout
* @tmout: overall timeout
*
- * LOCKING:
+ * Sleep until ATA Status register bit BSY clears,
+ * or a timeout occurs.
+ *
+ * LOCKING: None.
*
*/
@@ -1556,7 +1574,7 @@ static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
* ata_bus_edd -
* @ap:
*
- * LOCKING:
+ * LOCKING: None. Serialized during ata_bus_probe().
*
*/
@@ -1909,7 +1927,10 @@ static int ata_choose_xfer_mode(struct ata_port *ap,
* @ap: Port associated with device @dev
* @dev: Device to which command will be sent
*
- * LOCKING:
+ * Issue SET FEATURES - XFER MODE command to device @dev
+ * on port @ap.
+ *
+ * LOCKING: None. Serialized during ata_bus_probe().
*/
static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
@@ -1981,7 +2002,11 @@ static void ata_sg_clean(struct ata_queued_cmd *qc)
* ata_fill_sg - Fill PCI IDE PRD table
* @qc: Metadata associated with taskfile to be transferred
*
+ * Fill PCI IDE PRD (scatter-gather) table with segments
+ * associated with the current disk command.
+ *
* LOCKING:
+ * spin_lock_irqsave(host_set lock)
*
*/
static void ata_fill_sg(struct ata_queued_cmd *qc)
@@ -2028,6 +2053,10 @@ static void ata_fill_sg(struct ata_queued_cmd *qc)
* ata_check_atapi_dma - Check whether ATAPI DMA can be supported
* @qc: Metadata associated with taskfile to check
*
+ * Allow low-level driver to filter ATA PACKET commands, returning
+ * a status indicating whether or not it is OK to use DMA for the
+ * supplied PACKET command.
+ *
* LOCKING:
* RETURNS: 0 when ATAPI DMA can be used
* nonzero otherwise
@@ -2046,6 +2075,8 @@ int ata_check_atapi_dma(struct ata_queued_cmd *qc)
* ata_qc_prep - Prepare taskfile for submission
* @qc: Metadata associated with taskfile to be prepared
*
+ * Prepare ATA taskfile for submission.
+ *
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/

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