ata_wait_register (9) Linux Manual Page
ata_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)
Return
The final register value.
Author
Jeff Garzik
- Author.