'\" t
.\"     Title: ata_wait_register
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: March 2017
.\"    Manual: libata Library
.\"    Source: Kernel Hackers Manual 4.10.7
.\"  Language: English
.\"
.TH "ATA_WAIT_REGISTER" "9" "March 2017" "Kernel Hackers Manual 4\&.10\&" "libata Library"
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.SH "NAME"
ata_wait_register \- wait until register value changes
.SH "SYNOPSIS"
.HP \w'u32\ ata_wait_register('u
.BI "u32 ata_wait_register(struct\ ata_port\ *\ " "ap" ", void\ __iomem\ *\ " "reg" ", u32\ " "mask" ", u32\ " "val" ", unsigned\ long\ " "interval" ", unsigned\ long\ " "timeout" ");"
.SH "ARGUMENTS"
.PP
\fIap\fR
.RS 4
ATA port to wait register for, can be NULL
.RE
.PP
\fIreg\fR
.RS 4
IO\-mapped register
.RE
.PP
\fImask\fR
.RS 4
Mask to apply to read register value
.RE
.PP
\fIval\fR
.RS 4
Wait condition
.RE
.PP
\fIinterval\fR
.RS 4
polling interval in milliseconds
.RE
.PP
\fItimeout\fR
.RS 4
timeout in milliseconds
.RE
.SH "DESCRIPTION"
.PP
Waiting for some bits of register to change is a common operation for ATA controllers\&. This function reads 32bit LE IO\-mapped register
\fIreg\fR
and tests for the following condition\&.
.PP
(*\fIreg\fR
& mask) != val
.PP
If the condition is met, it returns; otherwise, the process is repeated after
\fIinterval_msec\fR
until timeout\&.
.PP
LOCKING: Kernel thread context (may sleep)
.SH "RETURN"
.PP
The final register value\&.
.SH "AUTHOR"
.PP
\fBJeff Garzik\fR
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br