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authorMarc Zyngier <Marc.Zyngier@arm.com>2011-12-15 11:19:23 (GMT)
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-12-18 23:00:26 (GMT)
commit2f0778afac79bd8d226225556858a636931eeabc (patch)
treee00cea674f3d6cc8c5584aa5b75239f11f6d229d /arch/arm/mach-sa1100
parent3bdc3484e8f2b1b219ad0397d81ce4601fbaf76d (diff)
downloadlinux-fsl-qoriq-2f0778afac79bd8d226225556858a636931eeabc.tar.xz
ARM: 7205/2: sched_clock: allow sched_clock to be selected at runtime
sched_clock() is yet another blocker on the road to the single image. This patch implements an idea by Russell King: http://www.spinics.net/lists/linux-omap/msg49561.html Instead of asking the platform to implement both sched_clock() itself and the rollover callback, simply register a read() function, and let the ARM code care about sched_clock() itself, the conversion to ns and the rollover. sched_clock() uses this read() function as an indirection to the platform code. If the platform doesn't provide a read(), the code falls back to the jiffy counter (just like the default sched_clock). This allow some simplifications and possibly some footprint gain when multiple platforms are compiled in. Among the drawbacks, the removal of the *_fixed_sched_clock optimization which could negatively impact some platforms (sa1100, tegra, versatile and omap). Tested on 11MPCore, OMAP4 and Tegra. Cc: Imre Kaloz <kaloz@openwrt.org> Cc: Eric Miao <eric.y.miao@gmail.com> Cc: Colin Cross <ccross@android.com> Cc: Erik Gilling <konkers@android.com> Cc: Olof Johansson <olof@lixom.net> Cc: Sascha Hauer <kernel@pengutronix.de> Cc: Alessandro Rubini <rubini@unipv.it> Cc: STEricsson <STEricsson_nomadik_linux@list.st.com> Cc: Lennert Buytenhek <kernel@wantstofly.org> Cc: Ben Dooks <ben-linux@fluff.org> Tested-by: Jamie Iles <jamie@jamieiles.com> Tested-by: Tony Lindgren <tony@atomide.com> Tested-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Krzysztof Halasa <khc@pm.waw.pl> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-sa1100')
-rw-r--r--arch/arm/mach-sa1100/time.c28
1 files changed, 3 insertions, 25 deletions
diff --git a/arch/arm/mach-sa1100/time.c b/arch/arm/mach-sa1100/time.c
index fa66024..1ee6d4c 100644
--- a/arch/arm/mach-sa1100/time.c
+++ b/arch/arm/mach-sa1100/time.c
@@ -12,7 +12,6 @@
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
-#include <linux/sched.h> /* just for sched_clock() - funny that */
#include <linux/timex.h>
#include <linux/clockchips.h>
@@ -20,29 +19,9 @@
#include <asm/sched_clock.h>
#include <mach/hardware.h>
-/*
- * This is the SA11x0 sched_clock implementation.
- */
-static DEFINE_CLOCK_DATA(cd);
-
-/*
- * Constants generated by clocks_calc_mult_shift(m, s, 3.6864MHz,
- * NSEC_PER_SEC, 60).
- * This gives a resolution of about 271ns and a wrap period of about 19min.
- */
-#define SC_MULT 2275555556u
-#define SC_SHIFT 23
-
-unsigned long long notrace sched_clock(void)
-{
- u32 cyc = OSCR;
- return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, SC_MULT, SC_SHIFT);
-}
-
-static void notrace sa1100_update_sched_clock(void)
+static u32 notrace sa100_read_sched_clock(void)
{
- u32 cyc = OSCR;
- update_sched_clock(&cd, cyc, (u32)~0);
+ return OSCR;
}
#define MIN_OSCR_DELTA 2
@@ -109,8 +88,7 @@ static void __init sa1100_timer_init(void)
OIER = 0;
OSSR = OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3;
- init_fixed_sched_clock(&cd, sa1100_update_sched_clock, 32,
- 3686400, SC_MULT, SC_SHIFT);
+ setup_sched_clock(sa1100_read_sched_clock, 32, 3686400);
clockevents_calc_mult_shift(&ckevt_sa1100_osmr0, 3686400, 4);
ckevt_sa1100_osmr0.max_delta_ns =