Re: midi problem, an isa device on a pci card

[Mathew Kanner]

Hello,
I've recived no responses.  Anyway, the following includes my
own solution to the question, lots of trial and error.  I've found that
isahints was the closest exsting code to what I wanted. 
As always, I would love to hear any comments.

>   How do I create isa devices from a pci device.  Do I search up the
> soundcard tree for the pci bus then search down for the isa bus, then
> create_child(..."mpushim")?

In pci device_attach:
isa=devclass_find("isa");
if( !isa ) {
device_printf(sc->dev,"cmi midi error no devclass for isa\n");
goto err;
}
if (devclass_get_devices(isa, &isalistp, &isacountp) != 0 ) {
device_printf(sc->dev,"cmi midi error fetching isa devices\n");
goto err;
}
if ( isacountp < 1 ) {
device_printf(sc->dev,"cmi midi no isa busses found\n");
goto err;
}
/*
 *  Be stupid and just pick the first isa bus
 */
sc->isadev = isalistp[0];
mpuisa=devclass_find("mpuisa");
if( !mpuisa ) {
device_printf(sc->dev,"cmi: midi driver not found\n");
goto err;
}
i = devclass_find_free_unit(mpuisa,0);
sc->mpudev = BUS_ADD_CHILD(sc->isadev, 1, "mpuisa", i);

[Needs to be done with BUS_ADD_CHILD, I tried with others, m' yo
they just don't work]

>   How do I tell the shim before the probe/attach what io region to look
> at, do I fiddle with ivars (or some internal structure),  do I mess with hints
> via kenv(9) [Is there a kenv(9)? ]

[ Say, p->port=0x300, then following would set it to 0x300-0x302 
  and the same IRQ as the pci device ]

bus_set_resource(sc->mpudev, SYS_RES_IOPORT, 0, p->port, 2);
bus_set_resource(sc->mpudev, SYS_RES_IRQ, 0, rman_get_start(sc->irq), 1);
if( device_probe_and_attach(sc->mpudev) == 0 ) {
device_printf(sc->dev,"added %s/%s\n", 
device_get_nameunit(sc->isadev), 
device_get_nameunit(sc->mpudev) );
   return ;
}


Cheers,
--Mat
-- 
Brain: Are you pondering what I'm pondering?
Pinky: I think so Brain, but the Rockettes, it's mostly girls, isn't it?
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midi problem, an isa device on a pci card

[Mathew Kanner]

Hello,
I've been fiddling with pci drivers in freebsd for a couple of
months and up to now everything has ok, I did a midi driver for es137x
which was relatively easy because the io was done on the pci bus.  I
was very pleased that there were enough resources for a newbie like me
to dive into kernel hacking.
Now I want to do one for the cmi card, but it seems to offer
the midi device on the isa bus, as does a bunch of cards.  I'm sure
they did this to confuse me.  
Linux seems to be happy just inb,outb in their pci driver,
which seems uncool to me.  Also since I can program the mpu to appear
to different locations I think the ISA bus driver can help determine
the best one to use...

Theory of Reality (mostly hand waving, as I've done no code yet)

Drivers:
cmi(pci),   my pci sound, it's on board btw.
mpushim(isa), the mpu401 from the tree but hacked to receive
from the pci soundcard driver

How I think should work:

probe cmi,
attach cmi,
do {
enable mpu401 at port region,
probe attach mpushim
while ( ! mpushim attached )
done

Big question mark:
How do I create isa devices from a pci device.  Do I search up the
soundcard tree for the pci bus then search down for the isa bus, then
create_child(..."mpushim")?
How do I tell the shim before the probe/attach what io region to look
at, do I fiddle with ivars (or some internal structure),  do I mess with hints
via kenv(9) [Is there a kenv(9)? ]

I think that these questions equally apply to joysticks.

Thanks,
--Mat
-- 
Brain: Are you pondering what I'm pondering?
Pinky: I think so, Brain, but if the plural of mouse is mice, wouldn't
the plural of spouse be spice?
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