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); |
regIO-mapped register
maskMask to apply to read register value
valWait condition
interval_msecpolling interval in milliseconds
timeout_msectimeout 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.