Allocating resources to isab children
Henrik Brix Andersen
brix at FreeBSD.org
Sun Mar 13 16:13:05 UTC 2011
On Mar 12, 2011, at 20:47, Henrik Brix Andersen wrote:
> On Mar 12, 2011, at 19:49, Henrik Brix Andersen wrote:
>> I am writing a driver for the GPIO part of the AMD CS5536 south bridge (isab0), but have encountered a problem with resource allocation.
>> The GPIO address (0x6100-0x61FF) is available through PCI BAR 1 as seen in the output from pciconf(8):
>> isab0 at pci0:0:15:0: class=0x060100 card=0x20901022 chip=0x20901022 rev=0x03 hdr=0x00
>> vendor = 'Advanced Micro Devices (AMD)'
>> device = 'CS5536 [Geode companion] ISA'
>> class = bridge
>> subclass = PCI-ISA
>> bar  = type I/O Port, range 32, base 0x6000, size 8, enabled
>> bar  = type I/O Port, range 32, base 0x6100, size 256, enabled
>> bar  = type I/O Port, range 32, base 0x6200, size 64, enabled
>> bar  = type I/O Port, range 32, base 0x9d00, size 128, enabled
>> bar  = type I/O Port, range 32, base 0x9c00, size 64, enabled
>> However, when I try to allocate the I/O port resource in the minimalistic example below, I always get 0x1100-0x1100, not 0x6100-0x61FF?
>> I have modelled the code after recommendation from John Baldwin in http://lists.freebsd.org/pipermail/freebsd-acpi/2007-August/003964.html but I must be doing something wrong...
> Ahh, I just re-read Johns recommendation and realized that isab does not support proxying resource allocations (yet). I will try adding that functionality and report back.
I have a patch ready for allowing the PCI-ISA bridge to proxy SYS_RES_MEMORY and SYS_RES_IOPORT resource allocations from direct children to the parent PCI bus.
The patch is available from here: http://people.freebsd.org/~brix/src-patches/isa_pci.c.diff
Comments are more than welcome. I am still trying to figure out how to allow children to allocate and setup interrupts through isab; any pointers to what needs to be done in that regard are also very welcome since I'm not having much luck with it so far...
Henrik Brix Andersen <brix at FreeBSD.org>
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 194 bytes
Desc: This is a digitally signed message part
Url : http://lists.freebsd.org/pipermail/freebsd-drivers/attachments/20110313/a7c6b8d5/PGP.pgp
More information about the freebsd-drivers