From mboxrd@z Thu Jan  1 00:00:00 1970
From: Helge Deller <deller@gmx.de>
Subject: Re: E Class and SCSI (53c700 driver)
Date: Thu, 02 Apr 2015 10:07:53 +0200
Message-ID: <551CF8D9.3020506@gmx.de>
References: <5519CA2B.9060407@gmail.com>
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Cc: linux-parisc <linux-parisc@vger.kernel.org>
To: Dmitry the Zuryanovich <dreadbit@gmail.com>,
	debian-hppa@lists.debian.org,
	James Bottomley <James.Bottomley@HansenPartnership.com>
Return-path: <linux-parisc-owner@vger.kernel.org>
In-Reply-To: <5519CA2B.9060407@gmail.com>
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List-Id: linux-parisc.vger.kernel.org

Hi Dmitry,

I've added the parisc-kernel-devel mailing list too, since I expect
that *if* somebody is able to answer your question, it will probably
be on the parisc-kernel-devel list...

On 31.03.2015 00:11, Dmitry the Zuryanovich wrote:
> As I understand, E class (in my case - E25) has LASI based 53c710
> which is handled by 53c700.c? (and in case of workstations wrapped by
> lasi700 - what's for? Just for detecting it?)
>
> If I know that that's
>
> 5. Sahp Baat Kiuh SCSI at 0xfff74000 [56/52] {4, 0x0, 0x044, 0x00039}
>
> , is there a reason to try to
>
> #modprobe 53c700 clock=25  base=0xfff74000

Looking at drivers/scsi/lasi700.c, it seems the lasi700 driver sets
additional flags like force_le_on_be, chip710, burst_length and so on.
In addition, the IRQs gets connected via drivers/parisc/lasi.c (see lasi_choose_irq()).
I assume you would need at least a "case 0x39" in there.
But James is the expert on the 53c700 driver, so he might know more... ?
  
> [correct my syntax] and may I expect this to work somehow?
>
> What's the problem with  SCSI on E class? Is that a need of some
> driver which calls 53c700.c with correct parameters taken from
> hardware? Can it be just passed to module via parameter or the
> problem is deeper?

It might be deeper.
In  arch/parisc/kernel/hardware.c I see:
         {HPHW_A_DMA, 0x044, 0x00039, 0x80, "Sahp Baat Kiuh SCSI"},
while other SCSI drivers on LASI have HPHW_FIO, e.g.:
	{HPHW_FIO, 0x016, 0x00082, 0x0, "Gecko Core SCSI"},


For reference, here is the full dmesg from Dmitry when he tried to boot his E25
machine with a recent Linux kernel:
ftp://parisc.parisc-linux.org/dmesg/E25.dmesg  (http://pastebin.com/sXqUjVub)

Helge