diff options
| -rw-r--r-- | arch/arm/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm/mach-realview/core.c | 10 | ||||
| -rw-r--r-- | arch/arm/mach-versatile/core.c | 10 | ||||
| -rw-r--r-- | arch/arm/plat-versatile/include/plat/sched_clock.h | 6 | ||||
| -rw-r--r-- | arch/arm/plat-versatile/sched-clock.c | 48 |
5 files changed, 54 insertions, 22 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 92e8c0174dd..34311f40d71 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -236,6 +236,7 @@ config ARCH_REALVIEW bool "ARM Ltd. RealView family" select ARM_AMBA select COMMON_CLKDEV + select HAVE_SCHED_CLOCK select ICST select GENERIC_CLOCKEVENTS select ARCH_WANT_OPTIONAL_GPIOLIB @@ -250,6 +251,7 @@ config ARCH_VERSATILE select ARM_AMBA select ARM_VIC select COMMON_CLKDEV + select HAVE_SCHED_CLOCK select ICST select GENERIC_CLOCKEVENTS select ARCH_WANT_OPTIONAL_GPIOLIB diff --git a/arch/arm/mach-realview/core.c b/arch/arm/mach-realview/core.c index 07c08151dfe..3d653e05b75 100644 --- a/arch/arm/mach-realview/core.c +++ b/arch/arm/mach-realview/core.c @@ -52,6 +52,8 @@ #include <mach/irqs.h> #include <plat/timer-sp.h> +#include <plat/sched_clock.h> + #include "core.h" /* used by entry-macro.S and platsmp.c */ @@ -658,6 +660,12 @@ void realview_leds_event(led_event_t ledevt) #endif /* CONFIG_LEDS */ /* + * The sched_clock counter + */ +#define REFCOUNTER (__io_address(REALVIEW_SYS_BASE) + \ + REALVIEW_SYS_24MHz_OFFSET) + +/* * Where is the timer (VA)? */ void __iomem *timer0_va_base; @@ -672,6 +680,8 @@ void __init realview_timer_init(unsigned int timer_irq) { u32 val; + versatile_sched_clock_init(REFCOUNTER, 24000000); + /* * set clock frequency: * REALVIEW_REFCLK is 32KHz diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c index e38acb0f89c..56cdc225742 100644 --- a/arch/arm/mach-versatile/core.c +++ b/arch/arm/mach-versatile/core.c @@ -51,6 +51,8 @@ #include <mach/platform.h> #include <plat/timer-sp.h> +#include <plat/sched_clock.h> + #include "core.h" /* @@ -886,6 +888,12 @@ void __init versatile_init(void) } /* + * The sched_clock counter + */ +#define REFCOUNTER (__io_address(VERSATILE_SYS_BASE) + \ + VERSATILE_SYS_24MHz_OFFSET) + +/* * Where is the timer (VA)? */ #define TIMER0_VA_BASE __io_address(VERSATILE_TIMER0_1_BASE) @@ -900,6 +908,8 @@ static void __init versatile_timer_init(void) { u32 val; + versatile_sched_clock_init(REFCOUNTER, 24000000); + /* * set clock frequency: * VERSATILE_REFCLK is 32KHz diff --git a/arch/arm/plat-versatile/include/plat/sched_clock.h b/arch/arm/plat-versatile/include/plat/sched_clock.h new file mode 100644 index 00000000000..5c3e4fc9fa0 --- /dev/null +++ b/arch/arm/plat-versatile/include/plat/sched_clock.h @@ -0,0 +1,6 @@ +#ifndef ARM_PLAT_SCHED_CLOCK_H +#define ARM_PLAT_SCHED_CLOCK_H + +void versatile_sched_clock_init(void __iomem *, unsigned long); + +#endif diff --git a/arch/arm/plat-versatile/sched-clock.c b/arch/arm/plat-versatile/sched-clock.c index 42efd14ed4b..3d6a4c292ca 100644 --- a/arch/arm/plat-versatile/sched-clock.c +++ b/arch/arm/plat-versatile/sched-clock.c @@ -18,37 +18,41 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ -#include <linux/cnt32_to_63.h> #include <linux/io.h> #include <linux/sched.h> -#include <asm/div64.h> -#include <mach/hardware.h> -#include <mach/platform.h> +#include <asm/sched_clock.h> +#include <plat/sched_clock.h> -#ifdef VERSATILE_SYS_BASE -#define REFCOUNTER (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_24MHz_OFFSET) -#endif - -#ifdef REALVIEW_SYS_BASE -#define REFCOUNTER (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_24MHz_OFFSET) -#endif +static DEFINE_CLOCK_DATA(cd); +static void __iomem *ctr; /* - * This is the Realview and Versatile sched_clock implementation. This - * has a resolution of 41.7ns, and a maximum value of about 35583 days. - * - * The return value is guaranteed to be monotonic in that range as - * long as there is always less than 89 seconds between successive - * calls to this function. + * Constants generated by clocks_calc_mult_shift(m, s, 24MHz, NSEC_PER_SEC, 60). + * This gives a resolution of about 41ns and a wrap period of about 178s. */ +#define SC_MULT 2796202667u +#define SC_SHIFT 26 + unsigned long long notrace sched_clock(void) { - unsigned long long v = cnt32_to_63(readl(REFCOUNTER)); + if (ctr) { + u32 cyc = readl(ctr); + return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, + SC_MULT, SC_SHIFT); + } else + return 0; +} - /* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */ - v *= 125<<1; - do_div(v, 3<<1); +static void notrace versatile_update_sched_clock(void) +{ + u32 cyc = readl(ctr); + update_sched_clock(&cd, cyc, (u32)~0); +} - return v; +void __init versatile_sched_clock_init(void __iomem *reg, unsigned long rate) +{ + ctr = reg; + init_fixed_sched_clock(&cd, versatile_update_sched_clock, + 32, rate, SC_MULT, SC_SHIFT); } |