WhyCan Forum(哇酷开发者社区)

/*
 * Wait up to 1s for value to be set in given part of reg.
 */
void mctl_await_completion(u32 *reg, u32 mask, u32 val)
{
        unsigned long tmo = timer_get_us() + 1000000;

        while ((readl(reg) & mask) != val) {
                if (timer_get_us() > tmo)
                        panic("Timeout initialising DRAM\n");
        }
}