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authorTimur Tabi <timur@freescale.com>2009-05-26 05:21:41 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-06-16 14:15:44 +1000
commit9317726de42a157c377f7fe9110a63260800582f (patch)
tree14641c8adc6a56b289bdef8acc8b2cf18dbf90f7
parent79290e4b692af8a76273bab38e41a3a385dedc7b (diff)
powerpc: Introduce macro spin_event_timeout()
The macro spin_event_timeout() takes a condition and timeout value (in microseconds) as parameters. It spins until either the condition is true or the timeout expires. It returns the result of the condition when the loop was terminated. This primary purpose of this macro is to poll on a hardware register until a status bit changes. The timeout ensures that the loop still terminates if the bit doesn't change as expected. This macro makes it easier for driver developers to perform this kind of operation properly. Signed-off-by: Timur Tabi <timur@freescale.com> Acked-by: Geoff Thorpe <Geoff.Thorpe@freescale.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/include/asm/delay.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/delay.h b/arch/powerpc/include/asm/delay.h
index f9200a65c63..1e2eb41fa05 100644
--- a/arch/powerpc/include/asm/delay.h
+++ b/arch/powerpc/include/asm/delay.h
@@ -2,8 +2,11 @@
#define _ASM_POWERPC_DELAY_H
#ifdef __KERNEL__
+#include <asm/time.h>
+
/*
* Copyright 1996, Paul Mackerras.
+ * Copyright (C) 2009 Freescale Semiconductor, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -30,5 +33,38 @@ extern void udelay(unsigned long usecs);
#define mdelay(n) udelay((n) * 1000)
#endif
+/**
+ * spin_event_timeout - spin until a condition gets true or a timeout elapses
+ * @condition: a C expression to evalate
+ * @timeout: timeout, in microseconds
+ * @delay: the number of microseconds to delay between each evaluation of
+ * @condition
+ *
+ * The process spins until the condition evaluates to true (non-zero) or the
+ * timeout elapses. The return value of this macro is the value of
+ * @condition when the loop terminates. This allows you to determine the cause
+ * of the loop terminates. If the return value is zero, then you know a
+ * timeout has occurred.
+ *
+ * This primary purpose of this macro is to poll on a hardware register
+ * until a status bit changes. The timeout ensures that the loop still
+ * terminates even if the bit never changes. The delay is for devices that
+ * need a delay in between successive reads.
+ *
+ * gcc will optimize out the if-statement if @delay is a constant.
+ */
+#define spin_event_timeout(condition, timeout, delay) \
+({ \
+ typeof(condition) __ret; \
+ unsigned long __loops = tb_ticks_per_usec * timeout; \
+ unsigned long __start = get_tbl(); \
+ while (!(__ret = (condition)) && (tb_ticks_since(__start) <= __loops)) \
+ if (delay) \
+ udelay(delay); \
+ else \
+ cpu_relax(); \
+ __ret; \
+})
+
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_DELAY_H */