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. January 2013 ATA_WAIT_REGISTER(9)