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_msec,
unsigned long timeout_msec);
ARGUMENTS
- reg
- IO-mapped register
- mask
- Mask to apply to read register value
- val
- Wait condition
- interval_msec
- polling interval in milliseconds
- timeout_msec
- 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.