[U-Boot] [PATCH 1/5] lib: Add wait_for_bit

[Marek Vasut]

On Tuesday, December 15, 2015 at 01:09:23 AM, Mateusz Kulikowski wrote:
> Add function to poll register waiting for specific bit(s).
> Similar functions are implemented in few drivers - they are almost
> identical and can be generalized.
> Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
> ---

Excellent !

>  include/wait_bit.h | 34 ++++++++++++++++++++++++++++++++++
>  lib/Kconfig        |  4 ++++
>  lib/Makefile       |  1 +
>  lib/wait_bit.c     | 44 ++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 83 insertions(+)
>  create mode 100644 include/wait_bit.h
>  create mode 100644 lib/wait_bit.c

[...]

> +int wait_for_bit(const char *prefix,

const u32 *

> u32 *reg, const u32 mask,

const bool, const unsigned int , const bool ;-)

> bool set,
> +		 unsigned int timeout, bool breakable)

> +{
> +	u32 val;
> +	unsigned long start = get_timer(0);
> +
> +	while (1) {
> +		val = readl(reg);
> +
> +		if (!set)
> +			val = ~val;
> +
> +		if ((val & mask) == mask)
> +			return 0;
> +
> +		if (get_timer(start) > timeout)
> +			break;
> +
> +		if (breakable && ctrlc()) {
> +			puts("Abort\n");
> +			return -EINTR;
> +		}
> +
> +		udelay(1);
> +	}
> +
> +	debug("%s: Timeout (reg=%p mask=%08x wait_set=%i)\n", prefix, reg, mask,
> +	      set);
> +
> +	return -ETIMEDOUT;
> +}

Best regards,
Marek Vasut