linux-kernel - Re: [RFC] mmc: msm_sdcc: Use SPS BAM as DMA engine

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Date:	Wed, 23 Mar 2011 06:05:35 -0700
From:	Daniel Walker <dwalker@...o99.com>
To:	Subhash Jadavani <subhashj@...eaurora.org>
Cc:	cjb@...top.org, linux-mmc@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, davidb@...eaurora.org,
	bryanh@...eaurora.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] mmc: msm_sdcc: Use SPS BAM as DMA engine

On Fri, 2011-03-18 at 18:54 +0530, Subhash Jadavani wrote:
> On recent MSMs, ADM (Data Mover) HW is not present
> which means existing SDCC driver can perform data
> transfer in PIO (peripheral IO) mode only.
> But PIO mode requires lot of CPU attention which
> would mean consuming extra CPU MIPS.
> 
> As a replacement on these recent MSMs, there is
> a new DMA HW engine named SPS-BAM (as part of
> Smart Peripheral System of MSM) is added for
> data movement between SDCC core and system memory.
> 
> This patch has done changes in existing MSM SDCC
> driver for using SPS-BAM as DMA engine.

1300+ lines of code might warrant more of a description .. In the
subject you say "DMA engine" but does this use drivers/dma/dmaengine.c ?

> Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
> ---
>  drivers/mmc/host/Kconfig        |   10 +
>  drivers/mmc/host/Makefile       |    1 +
>  drivers/mmc/host/msm_sdcc.c     |  929 +++++++++++++++++++++++++++++++++++++--
>  drivers/mmc/host/msm_sdcc.h     |   47 ++
>  drivers/mmc/host/msm_sdcc_dml.c |  303 +++++++++++++
>  drivers/mmc/host/msm_sdcc_dml.h |  120 +++++
>  6 files changed, 1374 insertions(+), 36 deletions(-)
>  create mode 100644 drivers/mmc/host/msm_sdcc_dml.c
>  create mode 100644 drivers/mmc/host/msm_sdcc_dml.h

I'd do at least two patches. One that adds msm_sdcc_dml.[ch] and one
that modifies msm_sdcc.[ch] and the Kconfig and Makefile.

Daniel

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