ATA_WAIT_REGISTER
Section: libata Library (9)
Updated: February 2011
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NAME
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)
RETURNS
The final register value.
AUTHOR
Jeff Garzik
-
Author.
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