linux-kernel - Re: [PATCH 3/4] Extend the DMA-engine API.

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Date:	Tue, 10 Jul 2007 08:46:03 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Zhang Wei <wei.zhang@...escale.com>
Cc:	akpm@...ux-foundation.org, paulus@...ba.org,
	galak@...nel.crashing.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] Extend the DMA-engine API.

On Tue, 10 Jul 2007 17:45:11 +0800 Zhang Wei wrote:

> Add channel wait queue and transfer callback dma_xfer_callback().
> If the DMA controller and driver support interrupt, when the
> transfer is finished, it will wakeup the wait queue
> and call the callback function of the channel.
> 
> Add dma_async_raw_xfer() to API and device_raw_xfer() to struct dma_device
> for RAW physical address DMA transfer, which will be used at transfer
> between I/O address and memory address.
> 
> Signed-off-by: Zhang Wei <wei.zhang@...escale.com>
> ---
>  include/linux/dmaengine.h |   35 +++++++++++++++++++++++++++++++++++
>  1 files changed, 35 insertions(+), 0 deletions(-)

>  /**
> + * dma_async_raw_xfer - transfor data between physical addresses with callback

                           transfer

> + * @chan: DMA channel to be used
> + * @dest: destination address (physical)
> + * @src: source address (physical)
> + * @len: length
> + */
> +static inline dma_cookie_t dma_async_raw_xfer(struct dma_chan *chan,
> +				dma_addr_t dest, dma_addr_t src, size_t len,
> +				dma_xfer_callback cb, void *data)
> +{


---
~Randy
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