linux-kernel - Re: [PATCH] m68knommu: get rid of __do_IRQ and add support for using gpio irqs.

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Date:	Mon, 11 Jan 2010 13:48:59 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	Steven King <sfking@...dc.com>
CC:	uClinux development list <uclinux-dev@...inux.org>,
	linux-m68k <linux-m68k@...ts.linux-m68k.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] m68knommu: get rid of __do_IRQ and add support for using
 gpio irqs.


Hi Steven,

Steven King wrote:
> Since we now have generic irq support for m68knommu and as __do_IRQ is
> supposed to go away real soon now, I added config GENERIC_HARDIRQS_NO__DO_IRQ
> to m68knommu/Kconfig.  Unfortunately, that produced an unbootable kernel --
> looking at the code for generic_handle_irq in linux/irq.h, the NO__DO_IRQ
> version unconditionally calls desc->handle_irq, which suggests that an irq's
> handle_irq isnt getting initialized in the early boot and indeed, adding an
> initialization of handle_irq in init_IRQ produced a working system.
> 
> I'm not entirely satisfied with that solution as it ignores why we are getting
> an irq when no handler has been setup for it, but in any case, using
> set_irq_chip_and_handler in init_IRQ to initialize all the handlers is the
> right thing to do (or atleast, its what all the other arches do) (and I didnt
> feel like digging out the BDM pod to figure out where the mystery irq is
> coming from).
> 
> Then the real reason I was digging into the irq code is to add support for
> using gpio irqs on the gpios of the parts that support that.  The following
> patch is against 
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu.git for-next
> 
> only the intc-2 gpio irqs have been tested on real hardware.
> 
> ------------------------------
> 
> Get rid of __do_IRQ; use set_irq_chip_and_handler to initialize irqs.  Add
> support for using gpio irqs and setting the edge on external irqs generally.
> 
> Signed-off-by: Steven King <sfking@...dc.com>

Applied to the for-linus and for-next branches of the m68knommu git
tree.

Thanks
Greg



> --
> 
>  arch/m68k/include/asm/m520xsim.h             |    3 +
>  arch/m68k/include/asm/m523xsim.h             |    3 +
>  arch/m68k/include/asm/m5249sim.h             |    4 +-
>  arch/m68k/include/asm/m527xsim.h             |    3 +
>  arch/m68knommu/Kconfig                       |    4 ++
>  arch/m68knommu/platform/5272/intc.c          |   39 +++++++++++---
>  arch/m68knommu/platform/68328/ints.c         |    8 +--
>  arch/m68knommu/platform/68360/ints.c         |    8 +--
>  arch/m68knommu/platform/coldfire/intc-2.c    |   76 ++++++++++++++++++++++++--
>  arch/m68knommu/platform/coldfire/intc-simr.c |   68 ++++++++++++++++++++++--
>  arch/m68knommu/platform/coldfire/intc.c      |   59 +++++++++++++++++++--
>  11 files changed, 239 insertions(+), 36 deletions(-)
> 

-- 
------------------------------------------------------------------------
Greg Ungerer  --  Principal Engineer        EMAIL:     gerg@...pgear.com
SnapGear Group, McAfee                      PHONE:       +61 7 3435 2888
8 Gardner Close                             FAX:         +61 7 3217 5323
Milton, QLD, 4064, Australia                WEB: http://www.SnapGear.com
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