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From: "Shinji Watanabe" <watashin@mvision.co.jp>
To: <linuxppc-embedded@ozlabs.org>
Subject: How to access MPC8555 DMA register ?
Date: Tue, 6 Feb 2007 17:44:28 +0900	[thread overview]
Message-ID: <003b01c749cb$03998550$1601a8c0@wata> (raw)

Hi, all.

I used MPC8555CDS.

How to access DMA registers of MPC8555 ?

I can't read/write these registers on LINUX.

I called request_mem_region( 0xE0000000, LENGTH, ... ) in my device driver.

When I set LENGTH 0x21100, this function call succeded.

But When I set LENGTH 0x21200, this function call failed.

"e0021100-e002117f : fsl-dma0" is part of /proc/iomem log.

I guess my driver can't access fsl-dma0 area.

But fsl-dma0 area encompassed DMA registers I want to access.

I must find remove simbols like fsl-dma0.
Or I must find how to use modules encompass fsl-dma0.

Counld you give me some help/hint/tips ?

regards,

Shinji

             reply	other threads:[~2007-02-06  9:04 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-06  8:44 Shinji Watanabe [this message]
2007-02-06 16:36 ` How to access MPC8555 DMA register ? Kumar Gala
  -- strict thread matches above, loose matches on Subject: below --
2007-02-15 10:16 Shinji Watanabe

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