bus device driver

[Norbert Koch]

John Baldwin schrieb:
> On Monday 13 July 2009 10:05:15 am Norbert Koch wrote:
>   
>> Hello.
>>
>> I just started to write a device
>> driver for a multi-function pci card.
>> This card replaces a number of
>> independant isa hardware devices.
>> This pci card contains memory, i/o
>> and interrupt sources.
>> I want my device driver to
>> serve as a bus driver between
>> the pci driver and the specific
>> device drivers.
>>
>> Do I need more than the following (see below)?
>> Do I have to do any bookkeeping for allocated resources?
>>     
>
> How do the child devices receive resources?  Do they suballocate regions from 
> BARs in the PCI device or is your device a subtractive bridge that will 
> forward requests for ISA ranges and your devices all use ISA ranges?
>
>   
I am not quite sure that I understand what you mean. What is the difference?
My old device drivers were isa based. We had all our resources in the 
15-16M isa hole.
So I want to change them to just allocate resources from the pci bus 
through the bus device driver.
I thought it would be sufficient to just forward *_alloc_resource calls 
directly to the pci driver.
Clearly, my drivers will have to know that they are just forwarded 
through to pci
and have to know what sub-resources to allocate.




-- 
Dipl.-Ing. Norbert Koch
Entwicklung Prozessregler
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