[ECOS] PCI device driver questions
Gary Thomas
gary@mlbassoc.com
Fri Jan 30 23:38:00 GMT 2004
On Fri, 2004-01-30 at 15:21, John Newlin wrote:
> Hello,
>
>
> I'm working on the driver for a PCI device.
>
> There is a region of Bus Address space reserved for mapping PCI I/O and
> PCI memory regions.
>
> Where in the PCI driver does one map a processor physical address to a PCI
> 32/64 bit address.
>
>
> For example: If I have one device on PCI that has 1 4MB memory BAR, how
> would one map that 4MB region into local processor space.
>
> Pointers to some code examples would be great!
This happens automatically when you call cyg_pci_configure_bus. All
devices (and bridges) are discovered and eCos assigns both I/O and
memory areas to them at that time. Later, when you look up a
particular device, the device information will have a copy of the BAR
registers so you can determine how to talk to the device.
This file has an example of the HAL PCI glue, including a call to
configure the PCI space:
hal/arm/xscale/uE250/current/src/uE250_pci.c
To see how one might use a PCI device, look at any of the PCI based
network device drivers. For example:
devs/eth/powerpc/moab/current/include/moab_eth_dp83816.inl
--
Gary Thomas <gary@mlbassoc.com>
MLB Associates
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