Choosing between DELAY(useconds) and pause()

It appears that the pause() function cannot be used in driver functions whi=
ch are invoked early in the boot process. Is there is a kernel api which a =
device driver can use to determine whether to use pause() or DELAY(), for d=
elays which are say greater than 10hz - may be even 1 hz ?

Cheers,
David S.

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