Akira Iguchi wrote:
Dear everyone,
This is the patchset (based on 2.6.20-rc4) to add low-level I/O calls
which access the taskfile registers. The idea comes from drivers/ide
IN*/OUT* calls.
As you know, these calls are unnecessary for most libata drivers.
But the Celleb PATA driver needs them to use the libata common code.
And using these calls, it is possible to remove similar code
about PIO/MMIO access.
Sorry, but NAK.
libata intentionally provides higher level hooks than just I/O accessors.
A low level I/O hook approach makes it difficult to take into account
platform-specific details like mmiowb(), especially on embedded platforms.
The high level hook approach also enables greater efficiency. For
example, an embedded platform could do
__raw_writeb(datum, mmio_address + ATA_REG_FOO);
__raw_writeb(datum, mmio_address + ATA_REG_BAR);
eieio();
to optimize an entire taskfile-read or taskfile-write operation.
Jeff
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