[PATCHSET] libata: implement and use ata_wait_register()

[Tejun Heo <htejun@gmail.com>]

Hello, Jeff.

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 [1]
     + libata reset updates patchset (3 patches) [2]

Thanks.

--
tejun

[1] c2a6585296009379e0f4eff39cdcb108b457ebf2
[2] http://article.gmane.org/gmane.linux.ide/9414