From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [RFC v1 01/16] lib: devres: don't enclose pcim_*() functions in CONFIG_HAS_IOPORT
Date: Tue, 11 Dec 2012 22:20:03 +0000 [thread overview]
Message-ID: <201212112220.04597.arnd@arndb.de> (raw)
In-Reply-To: <20121211172916.2668a5be@pyramind.ukuu.org.uk>
On Tuesday 11 December 2012, Alan Cox wrote:
> The "no I/O space" case really applies to things like the S/390 mainframe
> which simply have no such concept on the system or the devices. In the
> ARM case the bus has an I/O space and the bridge glues the processors
> simpler model to the bridge model.
While we are getting slightly offtopic, s390 is actually gaining PCI support
now: https://patchwork.kernel.org/patch/1740231/ For all I can tell, they
would theoretically support an I/O space, but none of the supported
add-on cards use it, so the kernel implementation doesn't need to bother.
One architecture that never has an I/O space is the arch/um, but that is
special in a lot of ways, e.g. since it also never has MMIO.
On ARM, we have platforms that fall into four categories:
1. Full PCI or PCMCIA or ISA support with directly mapped I/O space
2. No PCI or PCMCIA or ISA support, and consequently no I/O space
3. PCI support but no I/O space because of limitations or bugs in
the PCI hardware implementation.
4. ISA-style I/O space that is not offsettable (CONFIG_NO_IOPORT)
but still has inb/outb accessors.
For cases 2 and 3, we can undefine the __io() macro, which leads to
intentional build errors someone tries to build code that uses the
inb/outb accessors. One missing piece that I have been working on
in the past and been meaning to pick up again is a patch set to
globally rename CONFIG_NO_IOPORT to the more appropriate
CONFIG_NO_IOPORT_MAP, and introduce a new CONFIG_NO_IOPORT that
signifies whether inb/outb are supported or not, rather than whether
you can access the I/O ports through ioport_map() and ioread/iowrite.
Arnd
next prev parent reply other threads:[~2012-12-11 22:20 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-07 22:04 [RFC v1] PCIe support for the Armada 370 and Armada XP SoCs Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 01/16] lib: devres: don't enclose pcim_*() functions in CONFIG_HAS_IOPORT Thomas Petazzoni
2012-12-11 10:43 ` Arnd Bergmann
2012-12-11 16:03 ` Thomas Petazzoni
2012-12-11 16:15 ` Arnd Bergmann
2012-12-11 16:23 ` Russell King - ARM Linux
2012-12-11 16:38 ` Thomas Petazzoni
2012-12-11 16:50 ` Russell King - ARM Linux
2012-12-11 17:29 ` Alan Cox
2012-12-11 22:20 ` Arnd Bergmann [this message]
2012-12-11 22:34 ` Arnd Bergmann
2012-12-11 16:30 ` Thomas Petazzoni
2012-12-11 16:46 ` Russell King - ARM Linux
2012-12-11 17:32 ` Alan Cox
2012-12-11 22:28 ` Arnd Bergmann
2012-12-11 16:55 ` Russell King - ARM Linux
2012-12-11 16:26 ` Russell King - ARM Linux
2012-12-11 17:16 ` Alan Cox
2012-12-11 17:34 ` Russell King - ARM Linux
2012-12-11 17:45 ` Alan Cox
2012-12-11 17:51 ` Russell King - ARM Linux
2012-12-07 22:04 ` [RFC v1 02/16] clk: mvebu: create parent-child relation for PCIe clocks on Armada 370 Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 03/16] arm: plat-orion: introduce WIN_CTRL_ENABLE in address mapping code Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 04/16] arm: plat-orion: refactor the orion_disable_wins() function Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 05/16] arm: plat-orion: introduce orion_{alloc, free}_cpu_win() functions Thomas Petazzoni
2012-12-08 11:53 ` [RFC v1 05/16] arm: plat-orion: introduce orion_{alloc,free}_cpu_win() functions Andrew Lunn
2012-12-08 12:15 ` Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 06/16] arm: mvebu: add functions to alloc/free PCIe decoding windows Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 07/16] arm: plat-orion: make common PCIe code usable on mvebu Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 08/16] arm: mvebu: the core PCIe driver Thomas Petazzoni
2012-12-10 8:28 ` Andrew Lunn
2012-12-10 8:45 ` Thomas Petazzoni
2012-12-10 19:08 ` Jason Gunthorpe
2012-12-11 10:56 ` Arnd Bergmann
2012-12-12 15:58 ` Thomas Petazzoni
2012-12-12 21:51 ` Jason Gunthorpe
2012-12-13 14:58 ` Arnd Bergmann
2012-12-13 17:40 ` Jason Gunthorpe
2012-12-13 19:09 ` Thomas Petazzoni
2012-12-14 19:34 ` Rob Herring
2012-12-13 12:19 ` Arnd Bergmann
2012-12-13 17:54 ` Jason Gunthorpe
2012-12-13 19:12 ` Thomas Petazzoni
2012-12-13 21:46 ` Arnd Bergmann
2012-12-13 22:27 ` Jason Gunthorpe
2012-12-07 22:04 ` [RFC v1 09/16] arm: mvebu: PCIe support is now available on mvebu Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 10/16] arm: mvebu: add PCIe Device Tree informations for Armada 370 Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 11/16] arm: mvebu: add PCIe Device Tree informations for Armada XP Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 12/16] arm: mvebu: PCIe Device Tree informations for OpenBlocks AX3-4 Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 13/16] arm: mvebu: PCIe Device Tree informations for Armada XP DB Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 14/16] arm: mvebu: PCIe Device Tree informations for Armada 370 Mirabox Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 15/16] arm: mvebu: PCIe Device Tree informations for Armada 370 DB Thomas Petazzoni
2012-12-07 22:04 ` [RFC v1 16/16] arm: mvebu: update defconfig with PCI and USB support Thomas Petazzoni
2012-12-07 23:33 ` [RFC v1] PCIe support for the Armada 370 and Armada XP SoCs Jason Gunthorpe
2012-12-10 17:52 ` Stephen Warren
2012-12-10 18:05 ` Thomas Petazzoni
2012-12-10 18:16 ` Stephen Warren
2012-12-10 18:59 ` Thomas Petazzoni
2012-12-10 19:07 ` Jason Gunthorpe
2012-12-10 20:08 ` Stephen Warren
2012-12-10 18:44 ` Jason Gunthorpe
2012-12-10 19:03 ` Thomas Petazzoni
2012-12-10 19:18 ` Jason Gunthorpe
2012-12-12 16:04 ` Thomas Petazzoni
2012-12-12 20:09 ` Jason Gunthorpe
2012-12-16 13:02 ` Thierry Reding
2012-12-11 7:52 ` Thierry Reding
2012-12-11 21:21 ` Stephen Warren
2012-12-12 20:34 ` Thierry Reding
2012-12-12 22:30 ` Stephen Warren
2012-12-13 7:03 ` Thierry Reding
2012-12-13 8:04 ` Jason Gunthorpe
2012-12-13 8:23 ` Thierry Reding
2012-12-13 18:12 ` Stephen Warren
2012-12-13 20:42 ` Thierry Reding
2012-12-13 20:47 ` Jason Gunthorpe
2012-12-13 21:16 ` Thierry Reding
2012-12-14 10:05 ` Thierry Reding
2012-12-14 15:10 ` Thierry Reding
2012-12-14 17:27 ` Jason Gunthorpe
2012-12-16 12:33 ` Thierry Reding
2012-12-17 18:29 ` Jason Gunthorpe
2012-12-17 19:41 ` Thierry Reding
2012-12-18 2:10 ` Stephen Warren
2012-12-18 2:51 ` Jason Gunthorpe
2012-12-18 17:03 ` Stephen Warren
2012-12-20 15:32 ` Thierry Reding
2012-12-21 13:38 ` Jay Agarwal
2012-12-21 14:03 ` Thierry Reding
2012-12-22 14:50 ` Thomas Petazzoni
2012-12-28 21:06 ` Thierry Reding
2012-12-28 21:16 ` Thomas Petazzoni
2012-12-28 23:49 ` Stephen Warren
2012-12-29 8:09 ` Thomas Petazzoni
2012-12-31 16:40 ` Stephen Warren
2012-12-29 9:33 ` Thierry Reding
2012-12-31 16:44 ` Stephen Warren
2013-01-02 20:09 ` Jason Gunthorpe
2013-01-03 14:20 ` Thierry Reding
2012-12-28 23:51 ` Stephen Warren
2012-12-18 7:32 ` Thierry Reding
2013-01-03 14:39 ` Thierry Reding
2013-01-03 15:00 ` Bjorn Helgaas
2013-01-03 15:11 ` Thierry Reding
2013-01-03 15:09 ` Thomas Petazzoni
2013-01-03 15:56 ` Arnd Bergmann
2013-01-03 16:01 ` Thierry Reding
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