Convert tegra to use the new sched_clock() infrastructure for extending 32bit counters to full 64-bit nanoseconds. Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> --- arch/arm/Kconfig | 1 + arch/arm/mach-tegra/timer.c | 22 ++++++++++++++++++++-- 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 0e1a966..ec7b027 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -570,6 +570,7 @@ config ARCH_TEGRA select GENERIC_CLOCKEVENTS select GENERIC_GPIO select HAVE_CLK + select HAVE_SCHED_CLOCK select COMMON_CLKDEV select ARCH_HAS_BARRIERS if CACHE_L2X0 select ARCH_HAS_CPUFREQ diff --git a/arch/arm/mach-tegra/timer.c b/arch/arm/mach-tegra/timer.c index c52bd84..b5f86dd 100644 --- a/arch/arm/mach-tegra/timer.c +++ b/arch/arm/mach-tegra/timer.c @@ -26,7 +26,6 @@ #include <linux/clocksource.h> #include <linux/clk.h> #include <linux/io.h> -#include <linux/cnt32_to_63.h> #include <asm/mach/time.h> #include <asm/localtimer.h> @@ -111,9 +110,25 @@ static struct clocksource tegra_clocksource = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; +static DEFINE_CLOCK_DATA(cd); + +/* + * Constants generated by clocks_calc_mult_shift(m, s, 1MHz, NSEC_PER_SEC, 60). + * This gives a resolution of about 1us and a wrap period of about 1h11min. + */ +#define SC_MULT 4194304000u +#define SC_SHIFT 22 + unsigned long long notrace sched_clock(void) { - return cnt32_to_63(timer_readl(TIMERUS_CNTR_1US)) * 1000; + u32 cyc = timer_readl(TIMERUS_CNTR_1US); + return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, SC_MULT, SC_SHIFT); +} + +static void notrace tegra_update_sched_clock(void) +{ + u32 cyc = timer_readl(TIMERUS_CNTR_1US); + update_sched_clock(&cd, cyc, (u32)~0); } static irqreturn_t tegra_timer_interrupt(int irq, void *dev_id) @@ -158,6 +173,9 @@ static void __init tegra_init_timer(void) WARN(1, "Unknown clock rate"); } + init_fixed_sched_clock(&cd, tegra_update_sched_clock, 32, + 1000000, SC_MULT, SC_SHIFT); + if (clocksource_register_hz(&tegra_clocksource, 1000000)) { printk(KERN_ERR "Failed to register clocksource\n"); BUG(); -- 1.6.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html