1. 21 11月, 2012 1 次提交
  2. 16 11月, 2012 1 次提交
    • T
      net: mvneta: driver for Marvell Armada 370/XP network unit · c5aff182
      Thomas Petazzoni 提交于
      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@marvell.com>, and then reviewed and cleaned up by Thomas
      Petazzoni <thomas.petazzoni@free-electrons.com>.
      Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
      Acked-by: NDavid S. Miller <davem@davemloft.net>
      c5aff182