Re: 2.6 networking support for Redwood[56]

On Mon, Jun 21, 2004 at 11:12:14PM +0000, Matt Porter wrote:

On Mon, Jun 21, 2004 at 02:39:48PM -0700, Dale Farnsworth wrote:

quoted

I'm adding network support for the IBM Redwood5 and Redwood6 in 2.6.

It looks like the best supported driver for the smc91111 chip
is used by the ARM folks and is found in drivers/net/arm/smc91x.[ch]
This driver recently went into the linux-2.5 tree.

I moved these two files into drivers/net so they are available for
PPC as well as ARM and added some Redwood-specific support.  That
was straightforward.  This driver calls a couple of ARM-specific
functions platform_get_resource() and platform_get_irq().  ARM
implements these functions in arch/arm/common/platform.c.  I
copied arch/arm/common/platform.c into arch/ppc/syslib/platform.c
which works fine, but I don't care for duplicated code.  Maybe a
better approach would be to add these functions to drivers/base/platform.c

How about wrapping each arch-specific call up in something more abstract
and then using OCP to get the PPC info?

roughly...

#ifdef CONFIG_PPC_OCP
TO_SMC_DEV		to_ocp_device()
SMC_GET_BASE_ADDR	dev->def->paddr
...
#else /* ARM */
TO_SMC_DEV		to_platform_device()
SMC_GET_BASE_ADDR	platform_get_resource(dev, IORESOURCE_MEM, 1)
...
#endif

There's only about 4 places in the probe/remove calls to do this.
Add an ocp_add_one_device in your redwood*.c to enable the smc9111
device with the board-specific attributes.

You may have to play a bit with the prove/remove calls since they
want to deal with a resource struct, but it might be worth looking
at.

Sounds like a better approach.  I'll modify the driver to present
either the ARM interface or the PPC_OCP interface.  Muddles the
driver a bit, but should keep both archs happy.

quoted

Comments?  Suggestions on how to go about getting this into linux-2.5?

Send a two part patch, 1/2 (file moves) 2/2 PPC changes to Nicolas
and cc jgarzik

Yes without architectural changes, should be easier to get in.

Thanks,
-Dale

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