Re: [PATCH v2] powerpc: add setmaskedbits macros

On Aug 16, 2007, at 10:18 AM, Timur Tabi wrote:

Kumar Gala wrote:

quoted

Can you post a driver that uses this.  I'm interested in seeing  
what the readability is really like using these macros.

I do not yet have any drivers ready, but I can give you an example:

	setmaskedbits_be32(&uccp->gumr_l,
		UCC_SLOW_GUMR_L_MODE_QMC | UCC_SLOW_GUMR_L_TDCR_1 |
		UCC_SLOW_GUMR_L_RDCR_16,
                UCC_SLOW_GUMR_L_MODE_MASK |  
UCC_SLOW_GUMR_L_TDCR_MASK |
		UCC_SLOW_GUMR_L_RDCR_MASK);

	setmaskedbits_be32(&uccp->gumr_h,
		UCC_SLOW_GUMR_H_SUART | UCC_SLOW_GUMR_H_TRX |
		UCC_SLOW_GUMR_H_TTX, UCC_SLOW_GUMR_H_RFW);

Can you also show what the UCC_SLOW* values look like.

The alternative to using a macro like this is to do this:

	reg = in_be32(p);
	reg &= ~some-mask-bits;
	reg |= some-other-bits;
	out_be32(p, reg);

-- 
Timur Tabi
Linux Kernel Developer @ Freescale