| commit | 923df96b9f31b7d08d8438ff9677326d9537accf | |
| author | Will Deacon <will.deacon@arm.com> | |
| Fri, 6 Jul 2012 14:46:45 +0000 (6 15:46 +0100) | ||
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | |
| Mon, 9 Jul 2012 16:42:23 +0000 (9 17:42 +0100) | ||
| tree | 3df937a0431a2ae0500ae011f5742a28611490fa | treesnapshot (tar.gz zip) |
| parent | f8f5701bdaf9134b1f90e5044a82c66324d2073f | commitdiff |
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>
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>
| arch/arm/include/asm/arch_timer.h | diffblobblamehistory | |
| arch/arm/include/asm/timex.h | diffblobblamehistory | |
| arch/arm/kernel/arch_timer.c | diffblobblamehistory |