1ATA_WAIT_REGISTER(9)            libata Library            ATA_WAIT_REGISTER(9)
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NAME

6       ata_wait_register - wait until register value changes
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SYNOPSIS

9       u32 ata_wait_register(void __iomem * reg, u32 mask, u32 val,
10                             unsigned long interval, unsigned long timeout);
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ARGUMENTS

13       reg
14           IO-mapped register
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16       mask
17           Mask to apply to read register value
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19       val
20           Wait condition
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22       interval
23           polling interval in milliseconds
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25       timeout
26           timeout in milliseconds
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DESCRIPTION

29       Waiting for some bits of register to change is a common operation for
30       ATA controllers. This function reads 32bit LE IO-mapped register reg
31       and tests for the following condition.
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33       (*reg & mask) != val
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35       If the condition is met, it returns; otherwise, the process is repeated
36       after interval_msec until timeout.
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LOCKING

39       Kernel thread context (may sleep)
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RETURNS

42       The final register value.
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AUTHOR

45       Jeff Garzik
46           Author.
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49Kernel Hackers Manual 2.6.       November 2011            ATA_WAIT_REGISTER(9)
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