[PATCH] MTD: atmel_nand: Add DMA support to access Nandflash
From: Ryan Mallon <hidden>
Date: 2011-01-17 21:35:13
Also in:
lkml
Possibly related (same subject, not in this thread)
- 2011-01-21 · Re: [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash · Artem Bityutskiy <dedekind1@gmail.com>
- 2011-01-18 · Re: [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash · Ryan Mallon <hidden>
- 2011-01-18 · [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash · Hong Xu <hidden>
- 2011-01-18 · Re: [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash · Ryan Mallon <hidden>
- 2011-01-18 · [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash · Hong Xu <hidden>
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 <redacted> ---
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 http://www.bluewatersys.com New Zealand Phone: +64 3 3779127 Freecall: Australia 1800 148 751 Fax: +64 3 3779135 USA 1800 261 2934