linux-kernel - Re: [PATCH 2/2] net: mv643xx_eth: proper initialization for Kirkwood SoCs

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Date:	Wed, 22 May 2013 14:16:07 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Andrew Lunn <andrew@...n.ch>, Jason Cooper <jason@...edaemon.net>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org, David Miller <davem@...emloft.net>,
	Lennert Buytenhek <buytenh@...tstofly.org>
Subject: Re: [PATCH 2/2] net: mv643xx_eth: proper initialization for Kirkwood
 SoCs

On Wed, May 22, 2013 at 10:04:02PM +0200, Sebastian Hesselbarth wrote:

> Ethernet controllers found on Kirkwood SoCs not only suffer from loosing
> MAC address register contents on clock gating but also some important
> registers are reset to values that would break ethernet. This patch

FWIW, we found that the bootloader has to write to PSC1, the driver
doesn't work with the power on/reset value of the register. So I think
it is safe to assume that all kirkwood bootloaders alter the value.

Our systems write the value 0x00638488 to PSC1.

I looked at patching mv643xx_eth, but ran into the same complexity you
did, it isn't clear what variants of this IP block have the
register/etc.

> +	/* Kirkwood resets some registers on gated clocks. Especially
> +	 * CLK125_BYPASS_EN must be cleared but is not available on
> +	 * all other SoCs/System Controllers using this driver.
> +	 */
> +	if (of_machine_is_compatible("marvell,kirkwood"))
> +		wrlp(mp, PORT_SERIAL_CONTROL1,
> +		     rdlp(mp, PORT_SERIAL_CONTROL1) & ~CLK125_BYPASS_EN);

of_machine_is_compatible seems heavy handed, I would expect this to be
based on the compatible string of the ethernet node itself, not the
machine??

Jason
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