[PATCHSET 2/9] implement and use ata_wait_register (repost)

[Tejun Heo <htejun@gmail.com>]

Hello, all.

This patchset is repost of implement-and-use-ata_wait_register
patchset.  This patchset is identical to the previous post[1].  This
repost is to manage confusion level.

This patchset implements ata_wait_register() and uses it in ahci and
sata_sil24.  The function is generalized form of ahci_poll_register()
with the following differences.

* Uses ioread32.

* The first read is done before calculating timeout such that
  unflushed io write doesn't affect timeout.  (no flush required
  before calling this function.)

* Test conditions is negated.  As it waits for something to change,
  negated test is more natural/powerful and allows this function to be
  used for wider purpos.

* Returns the last read value of @reg.

This patchset contains five patches.

#01-02	fix & prep sata_sil24 for following changes
#03-05	implement and use ata_wait_register()

This patchset is against.

  upstream (c2a6585296009379e0f4eff39cdcb108b457ebf2)
  + [1] misc-reset-updates patchset (repost)

--
tejun

[1] http://article.gmane.org/gmane.linux.ide/9495