netdev - Re: [net-next-2.6 PATCH 2/3] fs_enet: Add support for MPC512x to fs

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Date:	Thu, 21 Jan 2010 10:33:52 +0100
From:	Anatolij Gustschin <agust@...x.de>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, dzu@...x.de, wd@...x.de, jcrigby@...il.com,
	kosmo@...ihalf.com, linuxppc-dev@...abs.org,
	grant.likely@...retlab.ca
Subject: Re: [net-next-2.6 PATCH 2/3] fs_enet: Add support for MPC512x to
 fs_enet driver

On Thu, 21 Jan 2010 01:22:35 -0800 (PST)
David Miller <davem@...emloft.net> wrote:

> From: Anatolij Gustschin <agust@...x.de>
> Date: Thu, 21 Jan 2010 03:13:18 +0100
> 
> >  struct fec_info {
> > -	fec_t __iomem *fecp;
> > +	void __iomem *fecp;
>  ...
> >  /* write */
> > -#define FW(_fecp, _reg, _v) __fs_out32(&(_fecp)->fec_ ## _reg, (_v))
> > +#define FW(_regp, _reg, _v) __fs_out32((_regp)->fec_ ## _reg, (_v))
>  ...
> > +/* register address macros */
> > +#define fec_reg_addr(_type, _reg) \
> > +	(fep->fec.rtbl->fec_##_reg = (u32 __iomem *)((u32)fep->fec.fecp + \
> > +				(u32)&((__typeof__(_type) *)NULL)->fec_##_reg))
> > +
> > +#define fec_reg_mpc8xx(_reg) \
> > +	fec_reg_addr(struct mpc8xx_fec, _reg)
> > +
> > +#define fec_reg_mpc5121(_reg) \
> > +	fec_reg_addr(struct mpc5121_fec, _reg)
> 
> This is a step backwards in my view.
> 
> If you use the "fec_t __iomem *" type for the register
> pointer, you simply use &p->fecp->XXX to get the I/O
> address of register XXX and that's what you pass to
> the appropriate I/O accessor routines.
> 
> Now you've made it typeless, and then you have to walk
> through all of these contortions to get the offset.
 
OK, i give up

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