[U-Boot] [PATCH V3] net: fec_mxc: allow use with cache enabled

[Eric Nelson <eric.nelson@boundarydevices.com>]

On 03/13/2012 07:04 AM, Eric Nelson wrote:
> 	ensure that transmit and receive buffers are cache-line aligned
>          invalidate cache for each packet as received
> 	update receive buffer descriptors one cache line at a time
>          flush cache before transmitting
> 	
> Original patch by Marek:
> 	http://lists.denx.de/pipermail/u-boot/2012-February/117695.html
>
> Signed-off-by: Eric Nelson<eric.nelson@boundarydevices.com>
>
> ---
> V2 addresses some concerns from the ML:
> 	- Use readl()/writel() instead of mapped data structure
> 	  accesses
> 	- Wrong comment style
> 	-&rbd_base[0] == rbd_base
> 	removed 'volatile' from fec_send().
>
 > <snip>
>
> diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
> index 1fdd071..94a3927 100644
> --- a/drivers/net/fec_mxc.c
> +++ b/drivers/net/fec_mxc.c

...

> @@ -631,9 +682,11 @@ static void fec_halt(struct eth_device *dev)
>    * @param[in] length Data count in bytes
>    * @return 0 on success
>    */
> -static int fec_send(struct eth_device *dev, volatile void* packet, int length)
> +static int fec_send(struct eth_device *dev, void *packet, int length)
>   {
>   	unsigned int status;

I made this change to keep checkpatch happy (it doesn't like volatile),
but the declaration of struct eth_device in include/net.h seems to want
the volatile:

	int  (*send) (struct eth_device*, volatile void* packet, int length);

I'd rather have a checkpatch warning than a compiler warning, so I'll fix
this in V4...