Re: [patch 4/5] Add tsi108/9 On Chip Ethernet device driver support

[Jeff Garzik <jeff@garzik.org>]

akpm@osdl.org wrote:
> From: Zang Roy-r61911 <tie-fei.zang@freescale.com>
> 
> Add tsi108/9 on chip Ethernet controller driver support.
> 
> The driver code collects the feedback of previous posting form the mailing
> list and gives the update.
> 
> MPC7448HPC2 platform in arch/powerpc uses tsi108 bridge.
> 
> The following is a brief description of the Ethernet controller:
> 
> The Tsi108/9 Ethernet Controller connects Switch Fabric to two independent
> Gigabit Ethernet ports,E0 and E1.  It uses a single Management interface to
> manage the two physical connection devices (PHYs).  Each Ethernet port has
> its own statistics monitor that tracks and reports key interface
> statistics.  Each port supports a 256-entry hash table for address
> filtering.  In addition, each port is bridged to the Switch Fabric through
> a 2-Kbyte transmit FIFO and a 4-Kbyte Receive FIFO.
> 
> Each Ethernet port also has a pair of internal Ethernet DMA channels to
> support the transmit and receive data flows.  The Ethernet DMA channels use
> descriptors set up in memory, the memory map of the device, and access via
> the Switch Fabric.  The Ethernet Controller’s DMA arbiter handles
> arbitration for the Switch Fabric.  The Controller also has a register bus
> interface for register accesses and status monitor control.
> 
> The PMD (Physical Media Device) interface operates in MII, GMII, or TBI
> modes.  The MII mode is used for connecting with 10 or 100 Mbit/s PMDs. 
> The GMII and TBI modes are used to connect with Gigabit PMDs.  Internal
> data flows to and from the Ethernet Controller through the Switch Fabric. 
> Each
> 
> Ethernet port uses its transmit and receive DMA channels to manage data
> flows through buffer descriptors that are predefined by the system (the
> descriptors can exist anywhere in the system memory map).  These
> descriptors are data structures that point to buffers filled with data
> ready to transmit over Ethernet, or they point to empty buffers ready to
> receive data from Ethernet.
> 
> Signed-off-by: Alexandre Bounine <Alexandre.Bounine@tundra.com>
> Signed-off-by: Roy Zang	<tie-fei.zang@freescale.com>
> Signed-off-by: Andrew Morton <akpm@osdl.org>

applied