Re: Issues to access Compact Flash Card on MPC8360E

[Anton Vorontsov <cbouatmailru@gmail.com>]

On Mon, Aug 02, 2010 at 07:44:22PM +0530, Atul Deshmukh wrote:
> Thanks a lot Anton,
> From the dts entry given below,
> 
> localbus@e0005000 {
>          #address-cells = <2>;
>                #size-cells = <1>;
>                compatible = "fsl,mpc8349e-localbus",
>                             "fsl,pq2pro-localbus";
>                reg = <0xe0005000 0xd8>;
>                ranges = <0x3 0x0 0xf0000000 0x210>;
>                pata@3,0 {
>                        compatible = "fsl,mpc8349emitx-pata",
> "ata-generic";
>                        reg = <0x3 0x0 0x10 0x3 0x20c 0x4>;
>                        reg-shift = <1>;
>                        pio-mode = <6>;
>                        interrupts = <23 0x8>;
>                       interrupt-parent = <&ipic>;
>                };
>        };
> 
> 
> we can conclude that it uses ata-generic SATA/PATA controlelr driver which

How did you come to this conclusion? From the node above it's IMHO
pretty clear that IDE (PATA) is on the localbus.

The driver is drivers/ata/pata_of_platform.c.

> controls PCI-based IDE-controller where we can plug in our CF card...Am I
> right???

Nope, no PCI involved. CF is almost* directly connected to
the localbus.

> But in our design we don't use any controller we directly connects CF card
> to local bus where UPM controls it..

Yes, that's exactly how CF is done on MPC8349EmITX boards.

> Can you please explain how the interface is implemented in MPC8349..

Via localbus + UPM.

* 'almost' is because there are some buffers and inverters, see
  schematics:
  http://www.freescale.com/files/32bit/hardware_tools/schematics/MPC8349EMITXESCH.pdf

-- 
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2