[Xen-devel] [PATCH 02 of 10] arm: implement udelay()

[Tim Deegan <tim@xxxxxxx>]

# HG changeset patch
# User Tim Deegan <tim@xxxxxxx>
# Date 1330018799 0
# Node ID ec051056db2b6d37344629e2f01d17240099d5ec
# Parent  4a7c1420913135fbeba361cd9603e748c074cdac
arm: implement udelay()

Signed-off-by: Tim Deegan <tim@xxxxxxx>

diff -r 4a7c14209131 -r ec051056db2b xen/arch/arm/dummy.S
--- a/xen/arch/arm/dummy.S      Thu Feb 23 17:39:59 2012 +0000
+++ b/xen/arch/arm/dummy.S      Thu Feb 23 17:39:59 2012 +0000
@@ -62,5 +62,4 @@ DUMMY(gmfn_to_mfn);
 DUMMY(hypercall_create_continuation);
 DUMMY(send_timer_event);
 DUMMY(share_xen_page_with_privileged_guests);
-DUMMY(__udelay);
 DUMMY(wallclock_time);
diff -r 4a7c14209131 -r ec051056db2b xen/arch/arm/time.c
--- a/xen/arch/arm/time.c       Thu Feb 23 17:39:59 2012 +0000
+++ b/xen/arch/arm/time.c       Thu Feb 23 17:39:59 2012 +0000
@@ -171,6 +171,16 @@ void __cpuinit init_timer_interrupt(void
     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;
+    do {
+        dsb();
+        isb();
+    } while ( get_s_time() - deadline < 0 );
+}
+
 /*
  * Local variables:
  * mode: C
diff -r 4a7c14209131 -r ec051056db2b xen/include/asm-arm/delay.h
--- a/xen/include/asm-arm/delay.h       Thu Feb 23 17:39:59 2012 +0000
+++ b/xen/include/asm-arm/delay.h       Thu Feb 23 17:39:59 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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