From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Bob White" To: linuxppc-embedded@lists.linuxppc.org Date: Thu, 06 May 2004 11:35:31 -0400 MIME-Version: 1.0 Subject: DPRAM driver on 440gp Message-ID: <409A2303.2640.2967B3DD@localhost> Content-type: text/plain; charset=US-ASCII Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: 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 ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/