Date: Sun, 26 Sep 2004 13:47:20 +0100 From: n0g0013 <ttz@cobbled.net> To: freebsd-isdn@freebsd.org Subject: driver for usr 3409 pci ta Message-ID: <20040926124720.GA39113@eyore.cobbled.net>
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hello again. started work on this driver but, as this is my
first ever attempt at writing a device driver i'm struggling.
my basic problem is a general understanding of PCI
architecture and operation. i've read the handbook
documentation and some other refs i dug up on the web.
unfortunately they appear to have a basic understanding of
hardware (and PCI) as a requisite.
so, here's the question. since this thing is a TA i figure all
i need is some pretty simple IO to the card. but i can't find
any references to using memory mapped or direct IO. i remember
a lot of IO used to be byte pairs, one in, one out and an IRQ
channel for control but a little scared to start dumping data
into memory mapped resource space or IO channels as it's been
a long time since i even looked at this stuff.
also, are there standard PCI register information or are these
completely card specific? these are accessed with the PCIR_BAR
macros, right? so PCIR_BAR(1) will get me PCI register one . .
. but i don't understand the relationship of these macros to the
resource id for the bus_*_resource calls.
i guess what i need is a base line reference (pci interest
group will sell me specs i don't need) or a very simple PCI
driver that illustrates the above.
going to continue hacking in the mean time. thanks for any
help you can offer.
P.S: here is the output from pciconf -lv
none2@pci0:11:0: class=0x028000 card=0x340916ec \
chip=0x66921050 rev=0x01 hdr=0x00
vendor = 'Winbond Electronics Corp.'
device = 'W6692/92A/92CF PCI BusISDN S/T-Controller'
class = network
P.P.S: if this is a TA then i don't expect the iwic driver \
will work. + the subdevice id's don't match any in the \
source
--
t
t
z
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