Merge of 'docs' branch from

	rsync://rsync.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev

1 files changed, 58 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index e74f301e9bae..b009f801e7c5 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -467,12 +467,34 @@ static inline u8 ata_chk_status(struct ata_port *ap)
 	return ap->ops->check_status(ap);
 }
 
+
+/**
+ *	ata_pause - Flush writes and pause 400 nanoseconds.
+ *	@ap: Port to wait for.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
 static inline void ata_pause(struct ata_port *ap)
 {
 	ata_altstatus(ap);
 	ndelay(400);
 }
 
+
+/**
+ *	ata_busy_wait - Wait for a port status register
+ *	@ap: Port to wait for.
+ *
+ *	Waits up to max*10 microseconds for the selected bits in the port's
+ *	status register to be cleared.
+ *	Returns final value of status register.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
 static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
 			       unsigned int max)
 {
@@ -487,6 +509,18 @@ static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
 	return status;
 }
 
+
+/**
+ *	ata_wait_idle - Wait for a port to be idle.
+ *	@ap: Port to wait for.
+ *
+ *	Waits up to 10ms for port's BUSY and DRQ signals to clear.
+ *	Returns final value of status register.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
 static inline u8 ata_wait_idle(struct ata_port *ap)
 {
 	u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
@@ -525,6 +559,18 @@ static inline void ata_tf_init(struct ata_port *ap, struct ata_taskfile *tf, uns
 		tf->device = ATA_DEVICE_OBS | ATA_DEV1;
 }
 
+
+/**
+ *	ata_irq_on - Enable interrupts on a port.
+ *	@ap: Port on which interrupts are enabled.
+ *
+ *	Enable interrupts on a legacy IDE device using MMIO or PIO,
+ *	wait for idle, clear any pending interrupts.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
 static inline u8 ata_irq_on(struct ata_port *ap)
 {
 	struct ata_ioports *ioaddr = &ap->ioaddr;
@@ -544,6 +590,18 @@ static inline u8 ata_irq_on(struct ata_port *ap)
 	return tmp;
 }
 
+
+/**
+ *	ata_irq_ack - Acknowledge a device interrupt.
+ *	@ap: Port on which interrupts are enabled.
+ *
+ *	Wait up to 10 ms for legacy IDE device to become idle (BUSY
+ *	or BUSY+DRQ clear).  Obtain dma status and port status from
+ *	device.  Clear the interrupt.  Return port status.
+ *
+ *	LOCKING:
+ */
+
 static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
 {
 	unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;