MPC5200B - Mapping Micrel Ethernet Controller Chip

[Sri nava kala devi Valteti, TLS-Chennai]

Hi
Thank you for your response.
> Are you *sure* it's mapped at physical address 0xe0000000? (ie. have
>you verified that you can access the device registers via u-boot or a
>debugger?)  

Yes, We have accessed the Micrel chip via U-boot setting (Micrel Chips
Base addres) 0xE0000000 to the CS1 Start address Register.
The LP_CS1 pin is configured to access the chip in U-boot.


LINUX:
We also probed the CS1 signal and found some noise in the signal (but
wasn't any kind of pulse). It might not be the actual Chip Select pulse.
But in U-Boot, we are getting proper Chip Select pulse.

LINUX:
The MBAR is mapped to default 0xF0000000 value. The BAT 2 settings in
the "mpc52xx_set_bat" function, is set to map the 0xf0000000 area. 
Do we need to perform any similar BAT settings or any other settings to
access the IO Device mapped at 0xE0000000 ?


Thanks,
Kala.





-----Original Message-----
From: glikely at secretlab.ca [mailto:glikely at secretlab.ca] On Behalf Of
Grant Likely
Sent: Tuesday, November 13, 2007 9:21 AM
To: Sri nava kala devi Valteti, TLS-Chennai
Cc: linuxppc-embedded at ozlabs.org; Prakash Palanisamy, TLS-Chennai
Subject: Re: MPC5200B - Mapping Micrel Ethernet Controller Chip

On 11/12/07, Sri nava kala devi Valteti, TLS-Chennai
<srinavakalav at hcl.in> wrote:
>
> We are using MPC5200B based custom board. In that we have an external
Micrel's ethernet controller mapped at 0xE0000000.
>
> We have taken Lite5200 code as a reference to port linux to our new
board. We have integrated the ethernet driver given by the vendor
(Micrel).
>
> Unfortunately, we are not able to access the chip mapped at
0xE0000000.

Are you *sure* it's mapped at physical address 0xe0000000? (ie. have
you verified that you can access the device registers via u-boot or a
debugger?)  The chip selects on the 5200 are programmable so you need
to make sure that the chip select wired to the Micrel device is
actually configured for base address 0xe0000000.

There are up to 8 CS pins on the MPC5200B; LP_CS0 through LP_CS7.  See
section 9.7.1 in the MPC5200B user manual for details on how to
configure them.

> We performed the following steps to access the chip:
>
> i) We mapped this address range of the Ethernet Controller Chip in
function "mpc52xx_map_io" as
>
> "io_block_mapping(0xE0000000, 0xE0000000, 0x10000000, _PAGE_IO)"

You don't want to call this.  ioremap is the only function you should
need to call.  But *first*, you must make sure the CS pin is
configured correctly.

Cheers,
g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
grant.likely at secretlab.ca
(403) 399-0195

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