From: "Bob White" <bwhite@perigee.com>
To: linuxppc-embedded@lists.linuxppc.org
Subject: DPRAM driver on 440gp
Date: Thu, 06 May 2004 11:35:31 -0400 [thread overview]
Message-ID: <409A2303.2640.2967B3DD@localhost> (raw)
I've got a basic read/write driver working (thanks to O'reilly ldd2) on
the dpram on the peripheral bus.
I remap the physical addresses using "io_base = ioremap64(...)" in the
driver open call and then the user read and write functions can access
the dpram just fine.
I'd like the user to be able to access the dpram using a pointer, but I
am having trouble figuring out the mmap examples.
Given that the physical address has already been mapped, via
ioremap64(), do I need remap_page_range()? Does anyone have any ideas
on what the mmap file_op for this driver would look like? Do I even
need mmap() or should I just use an ioctl to return the pointer I've
already got to the user?
Bob
--
Robert B. White Perigee, A Division of Sensis Corp
Software Design Engr 316 Commerce Blvd.
TEL: 315.453.7842x29 Liverpool, NY 13088
FAX: 315.453.7917 www.Perigee.com
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next reply other threads:[~2004-05-06 15:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-06 15:35 Bob White [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-05-11 9:15 DPRAM driver on 440gp Fillod Stephane
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