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adds ndelay function (just like udelay)

PATCH New eran.liberty at gmail.com 2 participants 2 messages Jul 3, 2007

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eran.liberty at gmail.com

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#0 lore raw

PATCH 1/1 adds ndelay function (just like udelay)

Though most cpu's do not support delay of such resolution it is prudent to insert this delay where the hardware specs demands it.

Signed-off-by Eran Liberty <[email protected]>
time.c +10 -1
Index: lib_ppc/time.c
===================================================================
@@ -53,8 +53,17 @@
  */
 void udelay(unsigned long usec)
 {
-	ulong ticks = usec2ticks (usec);
+	ulong ticks = usec2ticks(usec);
 
+	wait_ticks(ticks);
+}
+
+/* ------------------------------------------------------------------------- */
+
+void ndelay (unsigned long nsec)
+{
+	ulong ticks = usec2ticks (1) * nsec / 1000 + 1;
+
 	wait_ticks (ticks);
 }
exports.h +1 -0
Index: include/exports.h
===================================================================
@@ -17,6 +17,7 @@
 void *malloc(size_t);
 void free(void*);
 void udelay(unsigned long);
+void ndelay(unsigned long);
 unsigned long get_timer(unsigned long);
 void vprintf(const char *, va_list);
 void do_reset (void);
common.h +1 -0
Index: include/common.h
===================================================================
@@ -559,6 +559,7 @@
 
 /* lib_$(ARCH)/time.c */
 void	udelay	      (unsigned long);
+void ndelay(unsigned long);
 ulong	usec2ticks    (unsigned long usec);
 ulong	ticks2usec    (unsigned long ticks);
 int	init_timebase (void);
#1 lore raw

PATCH 1/1 adds ndelay function (just like udelay)

Quoted 4 lines · eran.liberty at gmail.com

Though most cpu's do not support delay of such resolution it is prudent to insert this delay where the hardware specs demands it.

Signed-off-by Eran Liberty <[email protected]>

Yeah, okay. Looks pretty benign, but could cause confusion when high resolution delays are not available.

Acked-by Grant Likely <[email protected]>

Cheers,
g.

Signature · 4 lines
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
grant.likely at secretlab.ca
(403) 399-0195