• Tejun Heo's avatar
    libata: clean up SFF init mess · 1626aeb8
    Tejun Heo authored
    The intention of using port_mask in SFF init helpers was to eventually
    support exoctic configurations such as combination of legacy and
    native port on the same controller.  This never became actually
    necessary and the related code always has been subtly broken one way
    or the other.  Now that new init model is in place, there is no reason
    to make common helpers capable of handling all corner cases.  Exotic
    cases can simply dealt within LLDs as necessary.
    
    This patch removes port_mask handling in SFF init helpers.  SFF init
    helpers don't take n_ports argument and interpret it into port_mask
    anymore.  All information is carried via port_info.  n_ports argument
    is dropped and always two ports are allocated.  LLD can tell SFF to
    skip certain port by marking it dummy.  Note that SFF code has been
    treating unuvailable ports this way for a long time until recent
    breakage fix from Linus and is consistent with how other drivers
    handle with unavailable ports.
    
    This fixes 1-port legacy host handling still broken after the recent
    native mode fix and simplifies SFF init logic.  The following changes
    are made...
    
    * ata_pci_init_native_host() and ata_init_legacy_host() both now try
      to initialized whatever they can and mark failed ports dummy.  They
      return 0 if any port is successfully initialized.
    
    * ata_pci_prepare_native_host() and ata_pci_init_one() now doesn't
      take n_ports argument.  All info should be specified via port_info
      array.  Always two ports are allocated.
    
    * ata_pci_init_bmdma() exported to be used by LLDs in exotic cases.
    
    * port_info handling in all LLDs are standardized - all port_info
      arrays are const stack variable named ppi.  Unless the second port
      is different from the first, its port_info is specified as NULL
      (tells libata that it's identical to the last non-NULL port_info).
    
    * pata_hpt37x/hpt3x2n: don't modify static variable directly.  Make an
      on-stack copy instead as ata_piix does.
    
    * pata_uli: It has 4 ports instead of 2.  Don't use
      ata_pci_prepare_native_host().  Allocate the host explicitly and use
      init helpers.  It's simple enough.
    Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
    Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
    1626aeb8
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