bus device driver

[Norbert Koch]

> From a hardware perspective, how do your devices know which addresses to 
> decode?  Do they consume subranges of BARs or are they assigned fixed 
> addresses somehow?  Do they have programmable decoders of some sort 
> themselves?  If you wish to have the PCI bus assign you resources then that 
> implies that your PCI device has a BAR and that you want to request resources 
> for that BAR and then hand out subranges of that to your children.  If that 
> is the case, then you will need to allocate the resources for the BAR for the 
> PCI device from the PCI bus.  Then your bus driver for the PCI device will 
> need to suballoc from that BAR to your children devices.
>
>   
My device decodes one ram address range (16MB) and gives me
one interrupt line.
As my sub-devices operate on partial address areas my idea was to
let them all call bus_alloc_resource() with the same rid parameter (= 
BAR selector)
and different offsets. So the bookkeeping should be done by the pci 
driver, right?