netdev - Re: [PATCH 02/12] fs_enet: Add MPC5121 FEC support.

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Date:	Wed, 06 May 2009 15:41:38 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Wolfgang Denk <wd@...x.de>
CC:	linuxppc-dev@...abs.org, Piotr Ziecik <kosmo@...ihalf.com>,
	John Rigby <jrigby@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 02/12] fs_enet: Add MPC5121 FEC support.

Wolfgang Denk wrote:
> +/*
> + *	Define the buffer descriptor structure.
> + */
> +typedef struct bufdesc {
> +	ushort	cbd_sc;			/* Control and status info */
> +	ushort	cbd_datlen;		/* Data length */
> +	uint	cbd_bufaddr;		/* Buffer address */
> +} cbd_t;
> +
> +/*
> + *	The following definitions courtesy of commproc.h, which where
> + *	Copyright (c) 1997 Dan Malek (dmalek@....net).
> + */
> +#define BD_SC_WRAP		((ushort)0x2000)
> +
> +/*
> + * Buffer descriptor control/status used by Ethernet receive.
> + */
> +#define BD_ENET_RX_EMPTY	((ushort)0x8000)
> +#define BD_ENET_RX_WRAP		((ushort)0x2000)
> +#define BD_ENET_RX_INTR		((ushort)0x1000)
> +#define BD_ENET_RX_LAST		((ushort)0x0800)
> +#define BD_ENET_RX_FIRST	((ushort)0x0400)
> +#define BD_ENET_RX_MISS		((ushort)0x0100)
> +#define BD_ENET_RX_LG		((ushort)0x0020)
> +#define BD_ENET_RX_NO		((ushort)0x0010)
> +#define BD_ENET_RX_SH		((ushort)0x0008)
> +#define BD_ENET_RX_CR		((ushort)0x0004)
> +#define BD_ENET_RX_OV		((ushort)0x0002)
> +#define BD_ENET_RX_CL		((ushort)0x0001)
> +#define BD_ENET_RX_STATS	((ushort)0x013f)	/* All status bits */
> +
> +/*
> + * Buffer descriptor control/status used by Ethernet transmit.
> + */
> +#define BD_ENET_TX_READY	((ushort)0x8000)
> +#define BD_ENET_TX_PAD		((ushort)0x4000)
> +#define BD_ENET_TX_WRAP		((ushort)0x2000)
> +#define BD_ENET_TX_INTR		((ushort)0x1000)
> +#define BD_ENET_TX_LAST		((ushort)0x0800)
> +#define BD_ENET_TX_TC		((ushort)0x0400)
> +#define BD_ENET_TX_DEF		((ushort)0x0200)
> +#define BD_ENET_TX_HB		((ushort)0x0100)
> +#define BD_ENET_TX_LC		((ushort)0x0080)
> +#define BD_ENET_TX_RL		((ushort)0x0040)
> +#define BD_ENET_TX_UN		((ushort)0x0002)
> +#define BD_ENET_TX_CSL		((ushort)0x0001)
> +#define BD_ENET_TX_STATS	((ushort)0x03ff)	/* All status bits */

All of the above is duplicative (with even the same names) of stuff in 
asm/cpm.h.  Beyond just the duplication, what happens if both CPM2 and 
512x are enabled in the same kernel?

-Scott
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