Re: [PATCH v2] PL330: Add PL330 DMA controller driver
From: Marc Zyngier
Date: Thu Mar 25 2010 - 01:44:40 EST
On Thu, 25 Mar 2010 12:17:15 +0900
Joonyoung Shim <jy0922.shim@xxxxxxxxxxx> wrote:
> +/* instruction set functions */
> +static inline int pl330_dmaaddh(u8 *desc_pool_virt, u16 imm, bool ra)
> +{
> + u8 opcode = DMAADDH | (ra << 1);
> +
> + writeb(opcode, desc_pool_virt++);
desc_pool_virt is a virtual address (from dma_alloc_coherent). In such
case, write[bwl] seems to be the wrong interface. I suggest the
following code:
*desc_pool_virt++ = opcode;
> + writew(imm, desc_pool_virt);
Does anything ensure that this won't generate an unaligned access?
> + return 3;
> +}
M.
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