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To: j mckitrick <jcm@FreeBSD-uk.eu.org>
Subject: Re: softc with resource sharing 
Cc: Alexander Langer <alex@big.endian.de>,
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In-reply-to: Your message of "Thu, 24 May 2001 12:23:35 BST."
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References: <20010524122335.A87551@dogma.freebsd-uk.eu.org>  <20010524033453.A57329@dogma.freebsd-uk.eu.org> <20010524113815.C981@zerogravity.kawo2.rwth-aachen.d> 
Date: Thu, 24 May 2001 20:12:26 -0600
From: Warner Losh <imp@village.org>
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In message <20010524122335.A87551@dogma.freebsd-uk.eu.org> j mckitrick writes:
: Well, all of the resources have already been allocated when the ppc device
: has been attached.  The hardware port and interrupt have already been
: reserved and stored in the softc data structure for ppc.  All devices
: attached to ppc, like ppbus, are currently calling macros that call
: hardcoded inb/outb calls in sys/isa/ppcreg.h.  I am trying to figure out if
: i should rewrite the macros to use the correct bus_space calls, or store the
: info lower down, with each device's softc where it is more accessible.  At
: this point, all access to the parallel port IO registers is passed to the
: ppc device, and i am wondering if this should change and be handled be each
: device instead.

You should likely rewrite the macros to either call a method in the
parent device (eg ppbus_read_1()).  The alternative would be to
allocate the resource shared many times and manage it like that.

Warner

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