ATA_WAIT_REGISTER(9) libata Library ATA_WAIT_REGISTER(9)NAMEata_wait_register - wait until register value changes
SYNOPSIS
u32 ata_wait_register(struct ata_port * ap, void __iomem * reg,
u32 mask, u32 val, unsigned long interval,
unsigned long timeout);
ARGUMENTS
ap
ATA port to wait register for, can be NULL
reg
IO-mapped register
mask
Mask to apply to read register value
val
Wait condition
interval
polling interval in milliseconds
timeout
timeout in milliseconds
DESCRIPTION
Waiting for some bits of register to change is a common operation for
ATA controllers. This function reads 32bit LE IO-mapped register reg
and tests for the following condition.
(*reg & mask) != val
If the condition is met, it returns; otherwise, the process is repeated
after interval_msec until timeout.
LOCKING
Kernel thread context (may sleep)
RETURNS
The final register value.
AUTHOR
Jeff Garzik
Author.
COPYRIGHTKernel Hackers Manual 3.8. June 2014 ATA_WAIT_REGISTER(9)