libata no-dma pata driver

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Hi,

I am writing a libata-based ide driver for a compact flash interface
based on the ata_generic.c using 2.6.18-rc4-mm1.

The device doesn't support dma, so I need to implement a pio-only
driver. However ata_device_add() makes various calls to dma-related
functions such as ata_bmdma_*, ata_port_start(),
generic_error_handler() etc.

Could you give a bit of advice on what sort of ata_port_info fields
and ata_port_operations to use for no-dma operation? Is it readily
possible in the current implementation, i.e. are there any example
pio-only drivers?

Many thanks,
Bahadir
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