From: Russell King <rmk@arm.linux.org.uk>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>,
linux-arch@vger.kernel.org
Subject: Re: [RFC PATCH 2/4] pio-mapping: Add ARM support for the PIO mapping API
Date: Mon, 8 Feb 2010 16:54:17 +0000 [thread overview]
Message-ID: <20100208165417.GA29551@flint.arm.linux.org.uk> (raw)
In-Reply-To: <1265645421.4020.119.camel@pc1117.cambridge.arm.com>
On Mon, Feb 08, 2010 at 04:10:21PM +0000, Catalin Marinas wrote:
> The pio_data_direction could be dropped and use the DMA one. We could
> also use pio_kmap_read/pio_kmap_write or similar but we have to triple
> the number of functions, so I prefer the additional argument.
Do we need to do anything for reading a buffer for PIO _out_ to the
device? My understanding is that this has never been a problem.
The only problem I'm aware of is where PIO writes to the kernel
mapping of a lowmem pages; highmem pages need the data flushed out
of the temporary atomic kmap mapping anyway.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:
next prev parent reply other threads:[~2010-02-08 16:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-05 16:31 [RFC PATCH 0/4] PIO drivers and cache coherency Catalin Marinas
2010-02-05 16:31 ` [RFC PATCH 1/4] pio-mapping: Add generic support for PIO mapping API Catalin Marinas
2010-02-05 16:31 ` [RFC PATCH 2/4] pio-mapping: Add ARM support for the " Catalin Marinas
2010-02-05 16:43 ` James Bottomley
2010-02-05 17:20 ` Catalin Marinas
2010-02-05 17:36 ` James Bottomley
2010-02-05 18:02 ` Catalin Marinas
2010-02-08 16:10 ` Catalin Marinas
2010-02-08 16:54 ` Russell King [this message]
2010-02-08 17:20 ` James Bottomley
2010-02-08 17:33 ` Russell King
2010-02-08 19:07 ` James Bottomley
2010-02-08 18:02 ` [RFC PATCH 2/4] pio-mapping: Add ARM support for the PIOmapping API Catalin Marinas
2010-02-08 19:09 ` James Bottomley
2010-02-08 17:14 ` [RFC PATCH 2/4] pio-mapping: Add ARM support for the PIO mapping API James Bottomley
2010-02-09 18:03 ` Catalin Marinas
2010-02-17 9:11 ` Benjamin Herrenschmidt
2010-02-17 20:04 ` Russell King
2010-02-17 20:39 ` Benjamin Herrenschmidt
2010-02-05 16:32 ` [RFC PATCH 3/4] pio-mapping: Use the PIO mapping API in libata-sff.c Catalin Marinas
2010-02-05 16:32 ` [RFC PATCH 4/4] pio-mapping: Use the PIO mapping API in the ISP1760 HCD driver Catalin Marinas
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