summaryrefslogtreecommitdiff
path: root/arch/arm/include/asm/delay.h
diff options
context:
space:
mode:
authorJonathan Austin <Jonathan.Austin@arm.com>2012-09-21 21:51:44 +0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-09-27 01:57:52 +0400
commit56942fec06efa0e17df0f4c3b438332c923b9014 (patch)
tree89b604c987b7f6a0eaaa16af7a9d8f45711349a7 /arch/arm/include/asm/delay.h
parenta1b2dde70419ae947fd7c9c8fcad7da005dc600e (diff)
downloadlinux-56942fec06efa0e17df0f4c3b438332c923b9014.tar.xz
ARM: 7538/1: delay: add registration mechanism for delay timer sources
The current timer-based delay loop relies on the architected timer to initiate the switch away from the polling-based implementation. This is unfortunate for platforms without the architected timers but with a suitable delay source (that is, constant frequency, always powered-up and ticking as long as the CPUs are online). This patch introduces a registration mechanism for the delay timer (which provides an unconditional read_current_timer implementation) and updates the architected timer code to use the new interface. Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Jonathan Austin <jonathan.austin@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/delay.h')
-rw-r--r--arch/arm/include/asm/delay.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/include/asm/delay.h b/arch/arm/include/asm/delay.h
index dc6145120de3..ab98fdd083bd 100644
--- a/arch/arm/include/asm/delay.h
+++ b/arch/arm/include/asm/delay.h
@@ -15,6 +15,11 @@
#ifndef __ASSEMBLY__
+struct delay_timer {
+ unsigned long (*read_current_timer)(void);
+ unsigned long freq;
+};
+
extern struct arm_delay_ops {
void (*delay)(unsigned long);
void (*const_udelay)(unsigned long);
@@ -56,6 +61,10 @@ extern void __loop_delay(unsigned long loops);
extern void __loop_udelay(unsigned long usecs);
extern void __loop_const_udelay(unsigned long);
+/* Delay-loop timer registration. */
+#define ARCH_HAS_READ_CURRENT_TIMER
+extern void register_current_timer_delay(const struct delay_timer *timer);
+
#endif /* __ASSEMBLY__ */
#endif /* defined(_ARM_DELAY_H) */