From: marius.cristea@xxxxxxxxxxxxx
> Sent: 27 September 2024 09:36
>
> The PAC194X, IIO driver, is using some unaligned 56 bit registers.
> Provide some helper accessors in preparation for the new driver.
Someone please shoot the hardware engineer ;-)
Do separate unaligned access of the first 4 bytes and last four bytes.
It can't matter if the middle byte is accessed twice.
Or, for reads read 8 bytes from 'p & ~1ul' and then fixup
the value.
David
>
> Signed-off-by: Marius Cristea <marius.cristea@xxxxxxxxxxxxx>
> ---
> include/asm-generic/unaligned.h | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
> index a84c64e5f11e..d171a9f2377a 100644
> --- a/include/asm-generic/unaligned.h
> +++ b/include/asm-generic/unaligned.h
> @@ -152,4 +152,31 @@ static inline u64 get_unaligned_be48(const void *p)
> return __get_unaligned_be48(p);
> }
>
> +static inline void __put_unaligned_be56(const u64 val, u8 *p)
> +{
> + *p++ = (val >> 48) & 0xff;
> + *p++ = (val >> 40) & 0xff;
> + *p++ = (val >> 32) & 0xff;
> + *p++ = (val >> 24) & 0xff;
> + *p++ = (val >> 16) & 0xff;
> + *p++ = (val >> 8) & 0xff;
> + *p++ = val & 0xff;
> +}
> +
> +static inline void put_unaligned_be56(const u64 val, void *p)
> +{
> + __put_unaligned_be56(val, p);
> +}
> +
> +static inline u64 __get_unaligned_be56(const u8 *p)
> +{
> + return (u64)p[0] << 48 | (u64)p[1] << 40 | (u64)p[2] << 32 |
> + (u64)p[3] << 24 | p[4] << 16 | p[5] << 8 | p[6];
> +}
> +
> +static inline u64 get_unaligned_be56(const void *p)
> +{
> + return __get_unaligned_be56(p);
> +}
> +
> #endif /* __ASM_GENERIC_UNALIGNED_H */
>
> base-commit: b82c1d235a30622177ce10dcb94dfd691a49922f
> --
> 2.43.0
>
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
