ata_wait_register — wait until register value changes
u32 ata_wait_register ( | void __iomem * | reg, |
u32 | mask, | |
u32 | val, | |
unsigned long | interval_msec, | |
unsigned long | timeout_msec) ; |
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
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.