Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=48c87a4483d9146d9f23198163d6ee621535702d
Commit:     48c87a4483d9146d9f23198163d6ee621535702d
Parent:     a474de0a02ee9093af96414a30f69d433201d002
Author:     Jesper Nilsson <[EMAIL PROTECTED]>
AuthorDate: Fri Jan 25 17:31:38 2008 +0100
Committer:  Jesper Nilsson <[EMAIL PROTECTED]>
CommitDate: Fri Feb 8 11:06:35 2008 +0100

    CRIS v32: Add precise delay loops for ETRAX FS and ARTPEC-3.
    
    Implements cris_delay10ns.
---
 arch/cris/arch-v32/lib/delay.c |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/arch/cris/arch-v32/lib/delay.c b/arch/cris/arch-v32/lib/delay.c
new file mode 100644
index 0000000..39f1ac9
--- /dev/null
+++ b/arch/cris/arch-v32/lib/delay.c
@@ -0,0 +1,28 @@
+/*
+ * Precise Delay Loops for ETRAX FS
+ *
+ * Copyright (C) 2006 Axis Communications AB.
+ *
+ */
+
+#include <hwregs/reg_map.h>
+#include <hwregs/reg_rdwr.h>
+#include <hwregs/timer_defs.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+
+/*
+ * On ETRAX FS, we can check the free-running read-only 100MHz timer
+ * getting 32-bit 10ns precision, theoretically good for 42.94967295
+ * seconds.  Unsigned arithmetic and careful expression handles
+ * wrapping.
+ */
+
+void cris_delay10ns(u32 n10ns)
+{
+       u32 t0 = REG_RD(timer, regi_timer0, r_time);
+       while (REG_RD(timer, regi_timer0, r_time) - t0 < n10ns)
+               ;
+}
+EXPORT_SYMBOL(cris_delay10ns);
-
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