Date:	Fri, 27 Feb 2009 14:23:19 +0100
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Gary Thomas <gary@...assoc.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Marvell 88E609x switch?

On Fri, Feb 27, 2009 at 06:19:57AM -0700, Gary Thomas wrote:

> >>>>>>>>>>> Is there support for this device anywhere?  In particular,
> >>>>>>>>>>> the M88E6095 switch.
> >>>>>>>>>> Not at the moment, but it should be easy enough to add.  If your
> >>>>>>>>>> board already runs on 2.6.28+, I can whip up some patches for you
> >>>>>>>>>> to try from the docs I have for that part.
> >>>>>>>>> That would be much appreciated, thanks.
> >>>>>>>> I noticed that the 6095/6095F are quite similar to the 6131 as far
> >>>>>>>> as the register set goes.  So something along these lines (hacky
> >>>>>>>> patch, breaks 6131, not for mainline) might just work to detect
> >>>>>>>> single 6095s (cascading DSA chips is something that needs more work,
> >>>>>>>> let's get the single-chip case working first).
> >>>>>>>>
> >>>>>>>> The other thing you'll need to do is create dsa platform devices
> >>>>>>>> for your switch chips, a la how it's done in arch/arm/mach-orion5x/
> >>>>>>>> or arch/arm/mach-kirkwood/ for example -- you need to pass in a struct
> >>>>>>>> device * for your network device, a struct device * for your mii bus,
> >>>>>>>> the switch MII address on the MII bus, and names of the individual
> >>>>>>>> ports (where you'll specify "cpu" for the port on the switch chip that
> >>>>>>>> the CPU is connected to).
> >>>>>>>>
> >>>>>>>> Let me know if this works.
> >>>>>>> Thanks, I'll give it a try.  It will take a little effort
> >>>>>>> to get setup as I have to work within the open firmware
> >>>>>>> structure (that's how all the various components are
> >>>>>>> specified).
> >>>>>> Right, we don't have OF bindings yet.  I guess this would make sense
> >>>>>> to do generically at some point, since there are quite a few PPC
> >>>>>> platforms with DSA switch chips.
> >>>>> Here's what I tried - (patch attached) - a trulyhorrible hack,
> >>>>> but I've not figured out how to get the correct device pointers
> >>>>> from the OF world yet.  The boot log shows that it's trying, but
> >>>>> I don't see the DSA layer (M88E690x driver) doing the MII indirection
> >>>>> that's needed for this device.
> >>>>>
> >>>>> I'm probably not starting it up correctly, but I think I followed
> >>>>> the examples you cited.  Any ideas?
> >>>> "indirection needed for this device" -- does that mean that your
> >>>> switch chip is configured to use the multi-chip addressing mode?
> >>>> (It looks like it, as most of the MII addresses return ffff in
> >>>> their ID registers.)  If yes, you should set ->sw_addr to whatever
> >>>> MII address the chip has been assigned.
> >>> Much better, my switch seems to be found now.
> >>>
> >>>   Distributed Switch Architecture driver version 0.1
> >>>   gfar_mdio_read(cf9db400, 1, 0) = 1811
> >>>   gfar_mdio_write(cf9db400, 1, 0, 9a03) = 0
> >>>   gfar_mdio_read(cf9db400, 1, 0) = 1a03
> >>>   gfar_mdio_read(cf9db400, 1, 1) = 953
> >>>   mv88e6131_probe(cf9db400, 1) = 2387
> >>>   eth0: detected a Marvell 88E6095/88E6095F switch
> >>>      ...
> >>>   root@..._target:~ ls /sys/bus/mdio_bus/devices/
> >>>   24520:01:00  24520:01:02  24520:01:04  24520:01:06
> >>>   24520:01:01  24520:01:03  24520:01:05  24520:01:07
> >>>
> >>> However, the network subsystem still can't locate it.  It may be
> >>> a complication of the OF stuff and how the [gianfar] network
> >>> device knows what PHY to look at.
> >>>
> >>>   starting network interfaces...
> >>>   24520:01 not found
> >>>   eth0: Could not attach to PHY
> >>>
> >>> Also, how do I specify the [implicit] route within the switch
> >>> that connects '24520:01:00' to the CPU port '24520:01:0A' (if
> >>> there was such a thing)?  My boot loader has configured the
> >>> switch for this path - I've not looked through the log to see
> >>> what the DSA layer did.
> >>>
> >>> Thanks for your help
> >> Trying the simple/obvious did not work so well:
> >>   Distributed Switch Architecture driver version 0.1
> >>   mv88e6131_probe(cf9db400, 1) = 2387
> >>   eth0: detected a Marvell 88E6095/88E6095F switch
> >>   dsa slave smi: probed
> >>   lan1.2: 24520:01:00 already attached
> >>   Unable to handle kernel paging request for data at address 0x00000024
> > 
> > What did you do here?
> 
> I just tried to force it by making it probe '24520:01:00'
> instead of '24520:01'
> 
> > Also, can you show me what you're filling the dsa platform data
> > structure with?
> 
> struct dsa_platform_data _switch_data = {
>     .port_names[0]  = "lan1.1",
>     .port_names[1]  = "lan1.2",
>     .port_names[2]  = "lan1.3",
>     .port_names[3]  = "lan1.4",
>     .port_names[4]  = "lan1.5",
>     .port_names[5]  = "lan1.6",
>     .port_names[6]  = "lan1.7",
>     .port_names[7]  = "lan1.8",
>     .port_names[10]  = "cpu",
>     .sw_addr = 1,
> };

Just this should do the trick.  So what's not working -- are the
interfaces not showing up?  Or packet RX/TX isn't working?  Or
something else?
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