From: Shinya Kuribayashi <skuribay@pobox.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] in/out_le32, etc.
Date: Sun, 13 Feb 2011 23:41:29 +0900 [thread overview]
Message-ID: <4D57ED99.4040003@pobox.com> (raw)
In-Reply-To: <201102120323.59395.Aaron.Williams@caviumnetworks.com>
On 02/12/2011 08:23 PM, Aaron Williams wrote:
> There's in_xxx/out_xxx, __raw_readx/__raw_writex and readx/writex. What
> exactly is the difference between all of these? It looks like the in/out was
> added recently and is not present in the mips io.h file.
In the MIPS code, 'mips_io_port_base' makes in_xxx/out_xxx distinct
from readx/writex. And raw operations are never swapped in software.
Check <asm/io.h> for more details.
> For example, on our platform the PCI BAR address space is mapped to different
> 64-bit address spaces depending on the bus number. It would be very helpful if
> different macros were used for different I/O devices. For example, one set of
> macros for accessing PCI BAR address space.
prev parent reply other threads:[~2011-02-13 14:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-12 11:23 [U-Boot] in/out_le32, etc Aaron Williams
2011-02-13 14:41 ` Shinya Kuribayashi [this message]
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