wait: add a function to wait for a register ready by pulling method

The register status is checked by polling its value in request time

Signed-off-by: Rander Wang <rander.wang@linux.intel.com>

Author: RanderWang

src/include/sof/wait.h

@@ -36,6 +36,7 @@
 #include <stdint.h>
 #include <errno.h>
 #include <arch/wait.h>
+#include <sof/io.h>
 #include <sof/debug.h>
 #include <sof/work.h>
 #include <sof/timer.h>
@@ -185,4 +186,27 @@ static inline int poll_for_completion_delay(completion_t *comp, uint64_t us)
 	return 0;
 }
 
+static inline int poll_for_register_delay(uint32_t reg,
+					  uint32_t mask,
+					  uint32_t val, uint64_t us)
+{
+	uint64_t tick = clock_us_to_ticks(CLK_CPU, us);
+	uint32_t tries = DEFAULT_TRY_TIMES;
+	uint64_t delta = tick / tries;
+
+	if (!delta) {
+		delta = us;
+		tries = 1;
+	}
+
+	while ((io_reg_read(reg) & mask) != val) {
+		if (!tries--) {
+			trace_error(TRACE_CLASS_WAIT, "ewt");
+			return -EIO;
+		}
+		wait_delay(delta);
+	}
+	return 0;
+}
+
 #endif