[Xen-changelog] [xen-unstable] arm: implement udelay()

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Tim Deegan <tim@xxxxxxx>
# Date 1331651452 0
# Node ID cc1225c9690c89fae4622dcaf0fc01ce89546a32
# Parent  5d20d2f6ffed0a49f030f04a8870f1926babbcbf
arm: implement udelay()

Signed-off-by: Tim Deegan <tim@xxxxxxx>
Committed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---


diff -r 5d20d2f6ffed -r cc1225c9690c xen/arch/arm/dummy.S
--- a/xen/arch/arm/dummy.S      Fri Mar 09 16:54:24 2012 +0000
+++ b/xen/arch/arm/dummy.S      Tue Mar 13 15:10:52 2012 +0000
@@ -62,5 +62,4 @@
 DUMMY(hypercall_create_continuation);
 DUMMY(send_timer_event);
 DUMMY(share_xen_page_with_privileged_guests);
-DUMMY(__udelay);
 DUMMY(wallclock_time);
diff -r 5d20d2f6ffed -r cc1225c9690c xen/arch/arm/time.c
--- a/xen/arch/arm/time.c       Fri Mar 09 16:54:24 2012 +0000
+++ b/xen/arch/arm/time.c       Tue Mar 13 15:10:52 2012 +0000
@@ -171,6 +171,16 @@
     request_irq(30, timer_interrupt, 0, "phytimer", NULL);
 }
 
+/* Wait a set number of microseconds */
+void udelay(unsigned long usecs)
+{
+    s_time_t deadline = get_s_time() + 1000 * (s_time_t) usecs;
+    while ( get_s_time() - deadline < 0 )
+        ;
+    dsb();
+    isb();
+}
+
 /*
  * Local variables:
  * mode: C
diff -r 5d20d2f6ffed -r cc1225c9690c xen/include/asm-arm/delay.h
--- a/xen/include/asm-arm/delay.h       Fri Mar 09 16:54:24 2012 +0000
+++ b/xen/include/asm-arm/delay.h       Tue Mar 13 15:10:52 2012 +0000
@@ -1,8 +1,7 @@
 #ifndef _ARM_DELAY_H
 #define _ARM_DELAY_H
 
-extern void __udelay(unsigned long usecs);
-#define udelay(n) __udelay(n)
+extern void udelay(unsigned long usecs);
 
 #endif /* defined(_ARM_DELAY_H) */
 /*

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