From: ryan@bluewatersys.com (Ryan Mallon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash
Date: Tue, 18 Jan 2011 10:35:16 +1300 [thread overview]
Message-ID: <4D34B614.3000909@bluewatersys.com> (raw)
In-Reply-To: <1295248809-30334-2-git-send-email-hong.xu@atmel.com>
On 01/17/2011 08:20 PM, Hong Xu wrote:
> Some SAM9 chips have the ability to perform DMA between CPU and SMC controller.
> This patch adds DMA support for SAM9RL, SAM9G45, SSAM9G46,AM9M10, SAM9M11.
>
> Signed-off-by: Hong Xu <hong.xu@atmel.com>
> ---
One more comment:
> + if (cpu_has_dma() && use_dma) {
> + dma_cap_mask_t mask;
> +
> + dma_cap_zero(mask);
> + dma_cap_set(DMA_MEMCPY, mask);
> + host->dma_chan = dma_request_channel(mask, 0, NULL);
> +
> + if (!host->dma_chan) {
> + dev_err(host->dev, "Failed to request DMA channel\n");
> + host->dma_ready = 0;
Because host is kzalloc'ed above, you do not need to set host->dma_ready
to zero here.
~Ryan
--
Bluewater Systems Ltd - ARM Technology Solution Centre
Ryan Mallon 5 Amuri Park, 404 Barbadoes St
ryan at bluewatersys.com PO Box 13 889, Christchurch 8013
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next prev parent reply other threads:[~2011-01-17 21:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <hong.xu@atmel.com>
2011-01-18 6:36 ` [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash Hong Xu
2011-01-21 11:23 ` Artem Bityutskiy
2011-07-08 15:36 ` Ryan Mallon
2011-07-08 16:43 ` Hong Xu
2011-01-17 20:15 ` Ryan Mallon
2011-01-17 22:42 ` Ryan Mallon
2011-01-18 1:43 ` Xu, Hong
2011-01-18 2:44 ` Ryan Mallon
2011-01-17 21:35 ` Ryan Mallon [this message]
2011-07-08 17:32 ` Hong Xu
2011-01-18 3:08 ` Ryan Mallon
2011-01-18 6:17 ` 答复: " Xu, Hong
2011-01-18 3:02 Hong Xu
-- strict thread matches above, loose matches on Subject: below --
2011-01-14 9:34 Hong Xu
2011-01-14 10:00 ` Jamie Iles
2011-01-14 11:43 ` Peter Korsgaard
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