Hi Peng,
On 9 January 2018 at 04:11, Peng Fan <peng....@nxp.com> wrote:
> Add heler functions for wait mask set/clr.
>
> Signed-off-by: Peng Fan <peng....@nxp.com>
> Cc: Stefano Babic <sba...@denx.de>
> Cc: Fabio Estevam <fabio.este...@nxp.com>
> Cc: Masahiro Yamada <yamada.masah...@socionext.com>
> Cc: Simon Glass <s...@chromium.org>
> ---
> include/linux/delay.h | 4 ++++
> lib/time.c | 30 ++++++++++++++++++++++++++++++
> 2 files changed, 34 insertions(+)
>
> diff --git a/include/linux/delay.h b/include/linux/delay.h
> index 3dcd435d0d..b08fcb8c09 100644
> --- a/include/linux/delay.h
> +++ b/include/linux/delay.h
> @@ -21,4 +21,8 @@ static inline void ndelay(unsigned long nsec)
> udelay(DIV_ROUND_UP(nsec, 1000));
> }
>
> +int wait_mask_set_timeout(void *addr, u32 mask, u32 timeout);
> +
> +int wait_mask_clr_timeout(void *addr, u32 mask, u32 timeout);
> +
> #endif /* defined(_LINUX_DELAY_H) */
> diff --git a/lib/time.c b/lib/time.c
> index aed1a091f2..9701287629 100644
> --- a/lib/time.c
> +++ b/lib/time.c
> @@ -171,3 +171,33 @@ void udelay(unsigned long usec)
> usec -= kv;
> } while(usec);
> }
> +
> +int wait_mask_set_timeout(void *addr, u32 mask, u32 timeout)
> +{
> + unsigned long long end_tick;
> + u32 val;
> +
> + end_tick = usec_to_tick(timeout) + get_ticks();
> + do {
> + val = readl(addr);
> + if ((val & mask) == mask)
> + return 0;
> + } while (end_tick > get_ticks());
> +
> + return -ETIMEDOUT;
> +}
> +
> +int wait_mask_clr_timeout(void *addr, u32 mask, u32 timeout)
Do you think these would be better as wait_mask_timeout() and
wait_zero_timeout()?
> +{
> + unsigned long long end_tick;
> + u32 val;
> +
> + end_tick = usec_to_tick(timeout) + get_ticks();
> + do {
> + val = readl(addr);
> + if (!(val & mask))
> + return 0;
> + } while (end_tick > get_ticks());
> +
> + return -ETIMEDOUT;
> +}
> --
> 2.14.1
>
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