ATA_WAIT_REGISTER(9) libata Library ATA_WAIT_REGISTER(9)
NAME
ata_wait_register - wait until register value changes
SYNOPSIS
u32 ata_wait_register(void __iomem * reg, u32 mask, u32 val, unsigned long interval, unsigned long timeout);
ARGUMENTS
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.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 ATA_WAIT_REGISTER(9)
