netdev - Re: [PATCH 1/4] net: mvneta: driver for Marvell Armada 370/XP network unit

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Date:	Wed, 31 Oct 2012 12:12:29 +0100
From:	Florian Fainelli <florian@...nwrt.org>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Lennert Buytenhek <kernel@...tstofly.org>,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Lior Amsalem <alior@...vell.com>,
	Maen Suleiman <maen@...vell.com>
Subject: Re: [PATCH 1/4] net: mvneta: driver for Marvell Armada 370/XP network unit

Hello Thomas,

On Friday 26 October 2012 12:03:21 Thomas Petazzoni wrote:
> This patch contains a new network driver for the network unit of the
> ARM Marvell Armada 370 and the Armada XP. Both SoCs use the PJ4B
> processor, a Marvell-developed ARM core that implements the ARMv7
> instruction set.
> 
> Compared to previous ARM Marvell SoCs (Kirkwood, Orion, Discovery),
> the network unit in Armada 370 and Armada XP is highly different. This
> is the reason why this new 'mvneta' driver is needed, while the older
> ARM Marvell SoCs use the 'mv643xx_eth' driver.
> 
> Here is an overview of the most important hardware changes that
> require a new, specific, driver for the network unit of Armada 370/XP:
> 
>  - The new network unit has a completely different design and layout
>    for the RX and TX descriptors. They are now organized as a simple
>    array (each RX and TX queue has base address and size of this
>    array) rather than a linked list as in the old SoCs.
> 
>  - The new network unit has a different RXQ and TXQ management: this
>    management is done using special read/write counter registers,
>    while in the Old SocS, it was done using the Ownership bit in RX
>    and TX descriptors.
> 
>  - The new network unit has different interrupt registers
> 
>  - The new network unit way of cleaning of interrupts is not done by
>    writing to the cause register, but by updating per-queue counters
> 
>  - The new network unit has different GMAC registers (link, speed,
>    duplex configuration) and different WRR registers.
> 
>  - The new network unit has lots of new units like PnC (Parser and
>    Classifier), PMT, BM (Memory Buffer Management), xPON, and more.
> 
> The driver proposed in the current patch only handles the basic
> features. Additional hardware features will progressively be supported
> as needed.
> 
> This code has originally been written by Rami Rosen
> <rosenr@...vell.com>, and then reviewed and cleaned up by Thomas
> Petazzoni <thomas.petazzoni@...e-electrons.com>.

This is looking good from a PHY lib point of view now, thanks for doing this!
-- 
Florian
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