On Sat, Dec 30, 2017 at 11:12:36AM +0100, Álvaro Fernández Rojas wrote:
> The only difference with the existing wait_for_bit function is the fact that
> wait_for_bit_be expects the register size to be read.
>
> Signed-off-by: Álvaro Fernández Rojas <nolt...@gmail.com>
> ---
> include/wait_bit.h | 69
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 69 insertions(+)
>
> diff --git a/include/wait_bit.h b/include/wait_bit.h
> index 06ad43a122..828fdcda02 100644
> --- a/include/wait_bit.h
> +++ b/include/wait_bit.h
> @@ -69,5 +69,74 @@ static inline int wait_for_bit(const char *prefix, const
> u32 *reg,
> return -ETIMEDOUT;
> }
>
> +/**
> + * wait_for_bit_be() waits for bit set/cleared in BE register
> + *
> + * Function polls register waiting for specific bit(s) change
> + * (either 0->1 or 1->0). It can fail under two conditions:
> + * - Timeout
> + * - User interaction (CTRL-C)
> + * Function succeeds only if all bits of masked register are set/cleared
> + * (depending on set option).
> + *
> + * @param prefix Prefix added to timeout messagge (message visible only
> + * with debug enabled)
> + * @param reg Register that will be read (using read_be())
> + * @param size Size of the register that will be read
> + * @param mask Bit(s) of register that must be active
> + * @param set Selects wait condition (bit set or clear)
> + * @param timeout_ms Timeout (in miliseconds)
> + * @param breakable Enables CTRL-C interruption
> + * @return 0 on success, -EINVAL, -ETIMEDOUT or -EINTR on failure
> + */
> +static inline int wait_for_bit_be(const char *prefix,
> + const u32 *reg, const u8 size,
> + const u32 mask, const bool set,
> + const unsigned int timeout_ms,
> + const bool breakable)
> +{
> + u32 val;
> + unsigned long start = get_timer(0);
> +
> + while (1) {
> + switch(size)
> + {
> + case 8:
> + val = readb_be(reg);
> + break;
> + case 16:
> + val = readw_be(reg);
> + break;
> + case 32:
> + val = readl_be(reg);
> + break;
> + default:
> + debug("%s: invalid size %u\n", prefix, size);
> + return -EINVAL;
> + }
> +
> + if (!set)
> + val = ~val;
> +
> + if ((val & mask) == mask)
> + return 0;
> +
> + if (get_timer(start) > timeout_ms)
> + break;
> +
> + if (breakable && ctrlc()) {
> + puts("Abort\n");
> + return -EINTR;
> + }
> +
> + udelay(1);
> + WATCHDOG_RESET();
> + }
> +
> + debug("%s: Timeout (reg=%p mask=%08x wait_set=%i)\n", prefix, reg, mask,
> + set);
> +
> + return -ETIMEDOUT;
> +}Where is this used? Thanks! -- Tom
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