Need Info about IDE driver

[Sachin Rane]

Hi,
 
I am new to  'IDE' Linux driver.
Before writing this mail I tried to get information from internet but
couldn't hit the website which can give developer point of view
information.
 
I am going through the code '
kernel-2.6.16.1-ts.amcc440gx.basic.1/drivers/ide/pci/siimage.c' and user
manual for 'Sil0680' to understand how the IDE driver works.

I have very basic questions:
1. What does mean the value '2' i.e. 'Custom' which has been set for
'hwif->mmio'
 
2. Where I can find details about 'TaskFile'?

  
Regards,
Sachin Rane
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