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(struct ata_port * ap, void __iomem * reg,
10                             u32 mask, u32 val, unsigned long interval,
11                             unsigned long timeout);
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ARGUMENTS

14       ap
15           ATA port to wait register for, can be NULL
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17       reg
18           IO-mapped register
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20       mask
21           Mask to apply to read register value
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23       val
24           Wait condition
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26       interval
27           polling interval in milliseconds
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29       timeout
30           timeout in milliseconds
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DESCRIPTION

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

43       Kernel thread context (may sleep)
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RETURNS

46       The final register value.
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AUTHOR

49       Jeff Garzik
50           Author.
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53Kernel Hackers Manual 3.10         June 2019              ATA_WAIT_REGISTER(9)
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