On Sunday, June 22, 2014 at 01:58:08 PM, Corentin LABBE wrote:
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+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation version 2 of the License

The license text seems incomplete.
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I will replace it with a simplier line "Licensed under the GPL-2."

I'd suggest you to use the SPDX license identifiers then, but that's not 
something the kernel crowd agreed upon yet IIRC.Therefore , just make the text 
complete please.

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+	src_addr = kmap(sg_page(in_sg)) + in_sg->offset;
+	if (src_addr == NULL) {
+		dev_err(ss->dev, "KMAP error for src SG\n");
+		return -1;
+	}

Why can't you just use dma_map_sg() or somesuch ?

I do not see why I will use a DMA function in a driver without DMA support.
Perhaps I do not know some tricks.
Can I use writel/readl on address gived by DMA API ?

Oh, ok, good question -- dear list, shall one use sg_page()+kmap or sg_virt()?

btw. I just noticed you're just feeding the hardware FIFO in a loop with data in 
the scatterlists, do I understand it correctly ? The driver will consume quite a 
lot of CPU time to do that, can you not implement DMA here ?

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Best regards,
Marek Vasut