iopoll: Add read_poll_timeout common API
Add read_poll_timeout common API similar to Linux iopoll.
readx_poll_timeout will trigger read_poll_timeout with
proper op. This will help to extend the functionalities
like sleep_us to poll timeout in future.
This change is referenced from Linux from below commit:
commit <5f5323a14cad19323060a8cbf9d96f2280a462dd> ("iopoll:
introduce read_poll_timeout macro")
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
index ab0ae19..51966d8 100644
--- a/include/linux/iopoll.h
+++ b/include/linux/iopoll.h
@@ -11,7 +11,7 @@
#include <time.h>
/**
- * readx_poll_timeout - Periodically poll an address until a condition is met or a timeout occurs
+ * read_poll_timeout - Periodically poll an address until a condition is met or a timeout occurs
* @op: accessor function (takes @addr as its only argument)
* @addr: Address to poll
* @val: Variable to read the value into
@@ -24,7 +24,7 @@
* When available, you'll probably want to use one of the specialized
* macros defined below rather than this macro directly.
*/
-#define readx_poll_timeout(op, addr, val, cond, timeout_us) \
+#define read_poll_timeout(op, addr, val, cond, timeout_us) \
({ \
unsigned long timeout = timer_get_us() + timeout_us; \
for (;;) { \
@@ -39,6 +39,8 @@
(cond) ? 0 : -ETIMEDOUT; \
})
+#define readx_poll_timeout(op, addr, val, cond, timeout_us) \
+ read_poll_timeout(op, addr, val, cond, timeout_us)
#define readb_poll_timeout(addr, val, cond, timeout_us) \
readx_poll_timeout(readb, addr, val, cond, timeout_us)