linux-kernel - Re: [RFC] New MMC driver model

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Date:	Tue, 9 Jan 2007 14:25:37 +0000 (UTC)
From:	pierre Tardy <tardyp@...il.com>
To:	linux-kernel@...r.kernel.org
Subject:  Re: [RFC] New MMC driver model

Pierre Ossman <drzeus-list <at> drzeus.cx> writes:

>
> Register functions
> ==================
> 
> I also intend to write a couple of register functions (sdio_read[bwl])
> so that card drivers doesn't have to deal with MMC requests more than
> necessary.

Good idea. Another need may be a sdio_read[bwl]_sync, which will poll for the
end of the cmd52s, instead of waiting for the irq. This polling is faster than
wait_for_completion/irq/tasklet/complete mechanism, which involve several
context switches. 

>  Endianness can also be handled there (SDIO are always LE).
I dont remember sdio spec forcing HW registers to be LE. Function 0 registers
are (BLKSZ for ex), but Function 1-7 register may be BE if the designers found
an advantage to it..




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