Re: [PATCH 2/9] crypto: ux500/hash - Set DMA configuration though dma_slave_config()

From: Linus Walleij
Date: Thu Apr 25 2013 - 07:55:44 EST

Pls include Magnus.p.persson@xxxxxxxxxxxxxx on all these crypto/hash

On Thu, Apr 18, 2013 at 12:26 PM, Lee Jones <lee.jones@xxxxxxxxxx> wrote:

> The DMA controller currently takes configuration information from
> information passed though dma_channel_request(), but it shouldn't.
> Using the API, the DMA channel should only be configured during
> a dma_slave_config() call.
> Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> Cc: David S. Miller <davem@xxxxxxxxxxxxx>
> Cc: Andreas Westin <andreas.westin@xxxxxxxxxxxxxx>
> Cc: linux-crypto@xxxxxxxxxxxxxxx
> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>

> #define HASH_BLOCK_SIZE 64
> +#define HASH_DMA_FIFO 4

This is an address so write 0x0004 here please. Some hex notation atleast.

> /**
> * struct hash_device_data - structure for a hash device.
> - * @base: Pointer to the hardware base address.
> + * @base: Pointer to virtual base address of the hash device.
> + * @phybase: Pointer to physical memory location of the hash device.
> * @list_node: For inclusion in klist.
> * @dev: Pointer to the device dev structure.
> * @ctx_lock: Spinlock for current_ctx.
> @@ -361,6 +363,7 @@ struct hash_req_ctx {
> */
> struct hash_device_data {
> struct hash_register __iomem *base;
> + phys_addr_t phybase;

What you pass to the config function is a dma_addr_t actually.

This is the same thing on the platform, but generally:

phys_addr_t = in the address space as the memory controller sees it.
dma_addr_t = in the address space as the DMA controller sees it.

Often the same. Not always. So use dma_addr_t.

Apart from this a real nice patch!

Linus Walleij
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