[PATCH 1/6] mci: use struct cid

[Alexander Shiyan]

Hello.

> Linux has a struct mmc_cid where the CID data is parsed into whereas
> in barebox we call the UNSTUFF_BITS macro whenever we need a field
> from the CID data. Do it like Linux and parse the CID data into the
> same struct. While at it convert the UNSTUFF_BITS macro into a
> unstuff_bits static inline function.
...
> diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
> index 7ec2643b8d..34ea775813 100644
> --- a/drivers/mci/mci-core.c
> +++ b/drivers/mci/mci-core.c
> @@ -26,19 +26,19 @@
>
>  #define MAX_BUFFER_NUMBER 0xffffffff
>
> -#define UNSTUFF_BITS(resp,start,size)                                  \
> -       ({                                                              \
> -               const int __size = size;                                \
> -               const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
> -               const int __off = 3 - ((start) / 32);                   \
> -               const int __shft = (start) & 31;                        \
> -               u32 __res;                                              \
> -                                                                       \
> -               __res = resp[__off] >> __shft;                          \
> -               if (__size + __shft > 32)                               \
> -                       __res |= resp[__off-1] << ((32 - __shft) % 32); \
> -               __res & __mask;                                         \
> -       })
> +static inline u32 unstuff_bits(const u32 *resp, int start, int size)
> +{
> +       const int __size = size;
> +       const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1;
> +       const int __off = 3 - (start / 32);
> +       const int __shft = start & 31;
> +       u32 __res = resp[__off] >> __shft;
> +
> +       if (__size + __shft > 32)
> +               __res |= resp[__off - 1] << ((32 - __shft) % 32);
> +
> +       return __res & __mask;
> +}

For board specific code where the eMMC ID is used as a unique identifier,
it would be useful to have this function in the header.