delay: collect {m, n, u}delay declarations to include/linux/delay.h
Currently, mdelay() and udelay() are declared in include/common.h,
while ndelay() in include/linux/compat.h. It would be nice to
collect them into include/linux/delay.h like Linux.
While we are here, fix the ndelay() implementation; I used the
DIV_ROUND_UP() instead of (x)/1000 because it must wait *longer*
than the given period of time.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 533983f..a43e4d6 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -15,8 +15,6 @@
extern struct p_current *current;
-#define ndelay(x) udelay((x) < 1000 ? 1 : (x)/1000)
-
#define dev_dbg(dev, fmt, args...) \
debug(fmt, ##args)
#define dev_vdbg(dev, fmt, args...) \
diff --git a/include/linux/delay.h b/include/linux/delay.h
new file mode 100644
index 0000000..3dcd435
--- /dev/null
+++ b/include/linux/delay.h
@@ -0,0 +1,24 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _LINUX_DELAY_H
+#define _LINUX_DELAY_H
+
+#include <linux/kernel.h>
+
+void __udelay(unsigned long usec);
+void udelay(unsigned long usec);
+
+static inline void mdelay(unsigned long msec)
+{
+ while (msec--)
+ udelay(1000);
+}
+
+static inline void ndelay(unsigned long nsec)
+{
+ udelay(DIV_ROUND_UP(nsec, 1000));
+}
+
+#endif /* defined(_LINUX_DELAY_H) */