NAND driver

[RadhaKumar Pulyala]

I have faced situation similar to yours.

What I did was to start afresh instead of tweaking the generic nand
interface driver. I would suggest you to look at the OneNAND interface
driver. That will have a lot of similarities to an interface written for
a controller.

Hope that helps.

Regards,
RK

-----Original Message-----
From: linux-mtd-bounces at lists.infradead.org
[mailto:linux-mtd-bounces at lists.infradead.org] On Behalf Of Mark
Underwood
Sent: Tuesday, February 26, 2008 2:34 PM
To: linux-mtd at lists.infradead.org
Subject: Re: NAND driver


--- Mark Underwood <basicmark at yahoo.com> wrote:

> I'm writing a NAND driver for an ASIC. The NAND controller has been
designed to handle page read
> &
> writes with little SW intervention using interrupts or DMA, so I plan
to implement the
> write_page_raw & read_page_raw functions.
> However, looking through nand_base.c it looks like not all NAND access
go through these
> functions
> so to start with I have implemented the cmd_ctrl function & supplied
the IO_ADDR_R & IO_ADDR_W
> address with the thinking that these would be a fall back when the
access doesn't go through the
> raw functions.
> Unfortunately it seems the single write functionality of the
controller is broken. The page 
> read
> & write functionality only allow me to work in 512byte blocks so I
can't write OOB that way. Can
> you confirm that there are cases where OOB is written separately and
if so do you have any
> suggestions for getting around this problem?
> 
> Many thanks,
> 
> Mark
> 

I forgot to say that I'm working on a 2.6.21.1 kernel.

After some pondering I managed to implement the single write
functionality by abusing the command
fifo and playing with GPIO pins.

Looking through nand_base.c I notice that although I can pass in
*_page_raw operations in the
nand_chip structure they are not used in the *_page_swecc functions but
instead they call the
internal *_page_raw functions directly. I propose just to replace the
direct calls with indirect
ones (via the function pointers in the nand_chip structure). Does this
proposal sound OK?

Mark

> 
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