From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 13/15] ARM: make mach/io.h include optional
Date: Wed, 15 Feb 2012 00:57:22 +0000 [thread overview]
Message-ID: <201202150057.23189.arnd@arndb.de> (raw)
In-Reply-To: <20120214234313.GD29765@n2100.arm.linux.org.uk>
On Tuesday 14 February 2012, Russell King - ARM Linux wrote:
> > orion5x maps 2 1MB regions for PCI and PCIE. How would you support 2 io
> > ranges?
>
> That's not the only platform which effectively has two IO ranges. The
> PCMCIA sockets on SA11x0 and probably PXA both have their own separate
> IO region. Arnd's idea for this was to map 32k from one and 32k from
> the other into a single 64k space, and adapt soc_common to cope.
When going through the list today, I found that mv78xx0 in fact has eight
PCIe root complexes with their own I/O spaces.
This could still work with the method I suggested but it would limit
the I/O space per bus to 8kb, which is fairly small, so I'd still consider
using a 1MB space (allowing 16 separte 64 I/O windows) an equally
reasonable option.
> > BTW, I noticed some static mappings at 0xffxxxxxx. Are those even a
> > valid address?
>
> Nothing invalid about them as such, but I have tried to discourage their
> use in case we decide that we want to go for a default 14MB DMA region.
We still have the option to either put the I/O spaces in the vmalloc area
where they typically are now, or (provided it's small enough) put them
into the fixmap area, which is a little under 1MB in total size and
almost entirely unused on ARM today.
Arnd
next prev parent reply other threads:[~2012-02-15 0:57 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-13 21:43 [PATCH 00/15] mach/io.h cleanup and removal Rob Herring
2012-02-13 21:43 ` [PATCH 01/15] usb: ohci-pxa27x: add explicit include of hardware.h Rob Herring
2012-02-13 21:43 ` [PATCH 02/15] ARM: add explicit include of system.h to processor.h Rob Herring
2012-02-13 22:14 ` H Hartley Sweeten
2012-02-13 21:43 ` [PATCH 03/15] ARM: provide runtime hook for ioremap Rob Herring
2012-02-13 22:13 ` H Hartley Sweeten
2012-02-13 22:30 ` Russell King - ARM Linux
2012-02-13 22:48 ` Rob Herring
2012-02-13 21:43 ` [PATCH 04/15] ARM: imx: convert to common runtime ioremap hook Rob Herring
2012-02-16 0:17 ` Shawn Guo
2012-02-13 21:43 ` [PATCH 05/15] ARM: msm: use " Rob Herring
2012-02-13 23:05 ` David Brown
2012-02-13 21:43 ` [PATCH 06/15] ARM: msm: clean-up mach/io.h Rob Herring
2012-02-13 21:43 ` [PATCH 07/15] ARM: at91: " Rob Herring
2012-02-14 9:21 ` Nicolas Ferre
2012-02-14 13:24 ` Rob Herring
2012-02-16 7:43 ` Jean-Christophe PLAGNIOL-VILLARD
2012-02-16 14:08 ` Rob Herring
2012-02-16 14:23 ` Jean-Christophe PLAGNIOL-VILLARD
2012-02-23 17:26 ` Nicolas Ferre
2012-02-27 16:55 ` Rob Herring
2012-02-27 17:27 ` Jean-Christophe PLAGNIOL-VILLARD
2012-02-13 21:43 ` [PATCH 08/15] ARM: davinci: remove unneeded mach/io.h include Rob Herring
2012-02-13 21:43 ` [PATCH 09/15] ARM: orion5x: clean-up mach/io.h Rob Herring
2012-02-13 21:43 ` [PATCH 10/15] ARM: tegra: " Rob Herring
2012-02-13 21:43 ` [PATCH 11/15] ARM: ep93xx: " Rob Herring
2012-02-13 21:52 ` Ryan Mallon
2012-02-13 22:15 ` Rob Herring
2012-02-13 22:16 ` H Hartley Sweeten
2012-02-27 15:17 ` [PATCH] " Rob Herring
2012-02-13 21:43 ` [PATCH 12/15] ARM: clps711x: remove unneeded include of mach/io.h Rob Herring
2012-02-13 21:43 ` [PATCH 13/15] ARM: make mach/io.h include optional Rob Herring
2012-02-13 22:14 ` H Hartley Sweeten
2012-02-13 22:36 ` Russell King - ARM Linux
2012-02-13 22:55 ` Rob Herring
2012-02-14 2:03 ` Arnd Bergmann
2012-02-14 2:54 ` Rob Herring
2012-02-14 8:04 ` Arnd Bergmann
2012-02-14 14:36 ` Rob Herring
2012-02-14 17:16 ` Arnd Bergmann
2012-02-14 17:40 ` Russell King - ARM Linux
2012-02-14 18:12 ` Arnd Bergmann
2012-02-14 23:09 ` Rob Herring
2012-02-14 23:43 ` Russell King - ARM Linux
2012-02-15 0:25 ` Nicolas Pitre
2012-02-15 14:14 ` Rob Herring
2012-02-15 0:57 ` Arnd Bergmann [this message]
2012-02-27 19:31 ` Rob Herring
2012-02-28 16:10 ` Arnd Bergmann
2012-02-27 22:31 ` Rob Herring
2012-02-28 16:32 ` Arnd Bergmann
2012-02-13 23:15 ` H Hartley Sweeten
2012-02-14 1:06 ` Arnd Bergmann
2012-02-14 17:38 ` H Hartley Sweeten
2012-02-14 18:20 ` Arnd Bergmann
2012-02-13 21:43 ` [PATCH 14/15] ARM: remove bunch of now unused mach/io.h files Rob Herring
2012-02-13 22:16 ` H Hartley Sweeten
2012-02-16 0:19 ` Shawn Guo
2012-02-16 18:57 ` Linus Walleij
2012-02-13 21:43 ` [PATCH 15/15] ARM: kill off __mem_pci Rob Herring
2012-02-13 22:22 ` [PATCH 00/15] mach/io.h cleanup and removal Tony Lindgren
2012-02-13 23:56 ` Tony Lindgren
2012-02-14 3:09 ` Rob Herring
2012-02-13 23:41 ` Tony Lindgren
2012-02-14 3:20 ` Rob Herring
2012-02-14 17:24 ` Tony Lindgren
2012-02-14 17:57 ` Arnd Bergmann
2012-02-14 18:28 ` Nicolas Pitre
2012-02-14 19:41 ` Rob Herring
2012-02-14 20:43 ` Tony Lindgren
2012-02-14 21:26 ` Arnd Bergmann
2012-02-14 21:54 ` Rob Herring
2012-02-14 22:38 ` Arnd Bergmann
2012-02-21 22:47 ` Stephen Warren
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