diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-12-15 21:50:14 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-12-22 22:44:47 (GMT) |
| commit | 5c21b7ca2c1cca3758a1d357dd57987c96ad1aa0 (patch) | |
| tree | 4b2883e118d67534e139f7508bedb656abb63812 /arch | |
| parent | e3f4c0ab916334e861fc49eeb2673a8c13e978e7 (diff) | |
| download | linux-5c21b7ca2c1cca3758a1d357dd57987c96ad1aa0.tar.xz | |
ARM: u300: convert sched_clock() to use new infrastructure
Convert u300 to use the new sched_clock() infrastructure for extending
32bit counters to full 64-bit nanoseconds.
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm/mach-u300/timer.c | 17 |
2 files changed, 14 insertions, 4 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index ec7b027..d5bd266 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -790,6 +790,7 @@ config ARCH_U300 bool "ST-Ericsson U300 Series" depends on MMU select CPU_ARM926T + select HAVE_SCHED_CLOCK select HAVE_TCM select ARM_AMBA select ARM_VIC diff --git a/arch/arm/mach-u300/timer.c b/arch/arm/mach-u300/timer.c index 6c68fe7..3ec58bd 100644 --- a/arch/arm/mach-u300/timer.c +++ b/arch/arm/mach-u300/timer.c @@ -22,6 +22,7 @@ #include <mach/hardware.h> /* Generic stuff */ +#include <asm/sched_clock.h> #include <asm/mach/map.h> #include <asm/mach/time.h> #include <asm/mach/irq.h> @@ -353,12 +354,18 @@ static struct clocksource clocksource_u300_1mhz = { * this wraps around for now, since it is just a relative time * stamp. (Inspired by OMAP implementation.) */ +static DEFINE_CLOCK_DATA(cd); + unsigned long long notrace sched_clock(void) { - return clocksource_cyc2ns(clocksource_u300_1mhz.read( - &clocksource_u300_1mhz), - clocksource_u300_1mhz.mult, - clocksource_u300_1mhz.shift); + u32 cyc = readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC); + return cyc_to_sched_clock(&cd, cyc, (u32)~0); +} + +static void notrace u300_update_sched_clock(void) +{ + u32 cyc = readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC); + update_sched_clock(&cd, cyc, (u32)~0); } @@ -376,6 +383,8 @@ static void __init u300_timer_init(void) clk_enable(clk); rate = clk_get_rate(clk); + init_sched_clock(&cd, u300_update_sched_clock, 32, rate); + /* * Disable the "OS" and "DD" timers - these are designed for Symbian! * Example usage in cnh1601578 cpu subsystem pd_timer_app.c |