Arnd,

2015-11-22 21:02 GMT+01:00 Arnd Bergmann [off-list ref]:

On Sunday 22 November 2015 08:53:53 Marcin Wojtas wrote:

quoted

This commit enables finding appropriate mbus window and obtaining its
target id and attribute for given physical address in two separate
routines, both for IO and DRAM windows. This functionality
is needed for Armada XP/38x Network Controller's Buffer Manager and
PnC configuration.

Signed-off-by: Marcin Wojtas <redacted>

[DRAM window information reference in LKv3.10]
Signed-off-by: Evan Wang <redacted>

It's too long ago to remember all the details, but I thought we
had designed this so the configuration can just be done by
describing it in DT. What am I missing?

And those functions do not break this approach. They just enable
finding and reading the settings of MBUS windows done during initial
configuration. Please remember that mvebu-mbus driver fills the MBUS
windows registers basing on DT, however it just configures access CPU
- DRAM/perfipheral.

In this particular case only physical adresses of buffers are known
and we have to 'open windows' between BM <-> DRAM and NETA <-> BM
internal memory. Hence instead of hardcoding size/target/attribute, we
can take information stored in CPU DRAM/IO windows registers.

Best regards,
Marcin