Messages in this thread | | | Date | Wed, 6 Feb 2013 09:59:39 +0100 | Subject | Re: [PATCH] drivers/block/xsysace - replace in(out)_8/in(out)_be16/in(out)_le16 with generic iowrite(read)8/16(be) | From | Geert Uytterhoeven <> |
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On Wed, Feb 6, 2013 at 12:03 AM, Arnd Bergmann <arnd@arndb.de> wrote: > On Tuesday 05 February 2013, Michal Simek wrote: >> I want to be sure about this. I have parsed this again with closer look and >> seems to me that ioread32 is equal to readl and iowrite32 to writel. >> Arnd: Am I right? > > Correct. On all the architectures you care about (most importantly, not > x86), readl and ioread32 are defined to have the same semantics. There > are a few exceptions where ioread32 provides a wrapper for PCI > PIO accesses that are not memory mapped, making ioread32 slightly > slower than readl, but for all practical purposes you don't have > to worry about it ;-)
PCI PIO? Do you mean "PCI I/O space"? That's different, and accessed through inb() and friends, right?
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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