I see a problem with atmel_read_buf16 & atmel_write_buf16 functions.
As they are calling __raw_readsw & __raw_writesw respectively, which 
would cause panic in cases of 16 bit unaligned buffers.
However, the buf passed to these functions is of type u8* from 
atmel_read_buf & atmel_write_buf functions.

[Venu] 
> -	/* if no DMA operation possible, use PIO */
> -	memcpy_fromio(buf, chip->IO_ADDR_R, len);
> +	if (host->board->bus_width_16)
> +		atmel_read_buf16(mtd, buf, len);

> +	else
> +		atmel_read_buf8(mtd, buf, len);
>  }
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