ata_wait_register

Langue: en

Autres versions - même langue

Version: June 2009 (debian - 07/07/09)

Section: 9 (Appels noyau Linux)

Sommaire

NAME

ata_wait_register - wait until register value changes

SYNOPSIS

u32 ata_wait_register(void __iomem * reg, u32 mask, u32 val, unsigned long interval_msec, unsigned long timeout_msec);

ARGUMENTS

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

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.