cardbus/pci question

cardbus/pci question

[Alexander Sirotkin]

I could not find any information on this in the archives, so I thought I 
might ask it here.

Theoretically, it should be possible to write cardbus driver as a 
regular PCI driver. It will
not support hotplug, of course, but if one can assume that the hardware 
is plugged in by the
time the driver is loaded, it should work. One issue does bother me a 
little bit - cardbus is
connected to the PCI bus through a bridge. The question is - do I have 
to configure that bridge
from my driver (to get memory mappings and interrupts), because 
obviously the OS won't
do it for me when I'm not registered as cardbus driver.

Thanks.

In your answer, please CC me since I'm not subscribed to the list.

-- 
Alexander Sirotkin
SW Engineer

Texas Instruments
Broadband Communications Israel (BCIL)
Tel:  +972-9-9706587
________________________________________________________________________
"Those who do not understand Unix are condemned to reinvent it, poorly."
      -- Henry Spencer 

Re: cardbus/pci question

[Russell King]

On Tue, Jul 06, 2004 at 03:29:37PM +0300, Alexander Sirotkin wrote:
> I could not find any information on this in the archives, so I thought I 
> might ask it here.
> 
> Theoretically, it should be possible to write cardbus driver as a 
> regular PCI driver.

In Linux, a cardbus driver is exactly the same as a regular PCI driver.
There is no difference.  You get all the resources (device BARs) and
interrupts from the pci device structure, just like a regular PCI
driver.

There's no need to fiddle with the cardbus bridge at all.  In fact,
we'll scream at you if you attempt to do that because its a violation
of the system layering.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core