From: Will Deacon <will.deacon@arm.com>
Date: Fri, 6 Jul 2012 14:46:45 +0000 (+0100)
Subject: ARM: 7451/1: arch timer: implement read_current_timer and get_cycles
X-Git-Tag: v3.6-rc1~70^2^3~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=923df96b9f31b7d08d8438ff9677326d9537accf;p=pandora-kernel.git

ARM: 7451/1: arch timer: implement read_current_timer and get_cycles

This patch implements read_current_timer using the architected timers
when they are selected via CONFIG_ARM_ARCH_TIMER. If they are detected
not to be usable at runtime, we return -ENXIO to the caller.

Furthermore, if read_current_timer is exported then we can implement
get_cycles in terms of it for use as both an entropy source and for
implementing __udelay and friends.

Tested-by: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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