RE: [parisc-linux] zalon

RE: [parisc-linux] zalon

[mike_clapper]

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I believe Zalon is the chip that drives the f/w scsi on the core io card
in K series and possible others.

Mike

-----Original Message-----
From: gyula_matics@hp.com [mailto:gyula_matics@hp.com]
Sent: Tuesday, February 29, 2000 9:12 AM
To: parisc-linux@thepuffingroup.com
Subject: FW: [parisc-linux] zalon


Hi all,

I'm working on the ncr7xx driver and plan to add support for the
Bluefish GSC SCSI interface. I looked at the Mach kernel and
found that before accessing the c720 it is initializing something
called zalon.

What is that thing? Should one care about it or just blindly do the
same as the Mach kernel does?

Gyula

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Re: [parisc-linux] zalon

[Alex deVries]

mike_clapper@hp.com wrote:
> 
> I believe Zalon is the chip that drives the f/w scsi on the core io card
> in K series and possible others.

Zalon is really just some glue so you can interface some PC-like
controller chips with GSC.  I think it handles interrupts in a parisc
fashion.

We have no docs, and the only reason I know this is that a little birdy
told me.

- Alex


-- 
Alex deVries, Director of Professional Services, The Puffins at
Linuxcare
613.562.2759 tel
alex@linuxcare.com, http://www.linuxcare.com/
Linuxcare, Support for the revolution.

[parisc-linux] zalon

[Gyula Matics]

Hi all,

I'm working on the ncr7xx driver and plan to add support for the
Bluefish GSC SCSI interface. I looked at the Mach kernel and
found that before accessing the c720 it is initializing something
called zalon.

What is that thing? Should one care about it or just blindly do the
same as the Mach kernel does?

Gyula

Re: [parisc-linux] zalon

[Grant Grundler]

"Gyula Matics" wrote:
> Hi all,
> 
> I'm working on the ncr7xx driver and plan to add support for the
> Bluefish GSC SCSI interface. I looked at the Mach kernel and
> found that before accessing the c720 it is initializing something
> called zalon.
> 
> What is that thing?

It's the chip that allows 53c720 signals to mean something to PA-RISC I/O.
The things I'm aware Zalon chip provides:
o IODC bytes: identify the I/O board as zalon  (ie GSC SCSI)
o EIM register:  used to generate PA interrupt transactions based on
  NCR c720 "pulling" it's IRQ line.
o HPA: hard physical address decoding so firmware can assign an MMIO
  address.

BTW, Bluefish is the EISA form factor of the GSC SCSI card.
I'm pretty sure other form factors exist including for K-class
and "built-in".

> Should one care about it

Yes.

> or just blindly do the same as the Mach kernel does?

Probably not exactly. You want to look at how drivers/gsc/dino.c
uses gsc_alloc_irq() and do something very similar in order
to program the EIM register. AFAIK, Once the Zalon EIM register is
programmed, the c720 chip can be pretty much treated like it's
on a PCI bus *using MMIO*.

The MMIO base address is handed to the parisc-linux device driver in
the struct hp_device *. Again, see dino.c for details.

hope this helps,
grant

Grant Grundler
Unix Development Lab
+1.408.447.7253