sh: clockevent/clocksource/hrtimers/nohz TMU support.
authorPaul Mundt <lethal@linux-sh.org>
Wed, 9 May 2007 08:33:24 +0000 (17:33 +0900)
committerPaul Mundt <lethal@linux-sh.org>
Wed, 9 May 2007 08:33:24 +0000 (17:33 +0900)
This adds basic support for clockevents and clocksources,
presently only implemented for TMU-based systems (which
are the majority of SH-3 and SH-4 systems).

The old NO_IDLE_HZ implementation is also dropped completely,
the only users of this were on TMU-based systems anyways.

More work needs to be done to generalize the TMU handling,
in that the current implementation is rather tied to the
notion of TMU0 and TMU1 utilization.

Additionally, as more SH timers switch over to this scheme,
we'll be able to gut most of the remaining system timer
infrastructure that existed before.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
arch/sh/Kconfig
arch/sh/kernel/process.c
arch/sh/kernel/time.c
arch/sh/kernel/timers/timer-tmu.c
include/asm-sh/timer.h

index d74eb120a9c6b2255deb2812e8069b635f9b9a32..038179ecf6a904dd03fe65f9ab1d0654d4e2427a 100644 (file)
@@ -52,6 +52,9 @@ config GENERIC_IOMAP
 config GENERIC_TIME
        def_bool n
 
+config GENERIC_CLOCKEVENTS
+       def_bool n
+
 config SYS_SUPPORTS_APM_EMULATION
        bool
 
@@ -436,11 +439,11 @@ endmenu
 
 menu "Timer and clock configuration"
 
-if !GENERIC_TIME
-
 config SH_TMU
        bool "TMU timer support"
        depends on CPU_SH3 || CPU_SH4
+       select GENERIC_TIME
+       select GENERIC_CLOCKEVENTS
        default y
        help
          This enables the use of the TMU as the system timer.
@@ -459,8 +462,6 @@ config SH_MTU2
        help
          This enables the use of the MTU2 as the system timer.
 
-endif
-
 config SH_TIMER_IRQ
        int
        default "28" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785
@@ -468,24 +469,6 @@ config SH_TIMER_IRQ
        default "140" if CPU_SUBTYPE_SH7206
        default "16"
 
-config NO_IDLE_HZ
-       bool "Dynamic tick timer"
-       help
-         Select this option if you want to disable continuous timer ticks
-         and have them programmed to occur as required. This option saves
-         power as the system can remain in idle state for longer.
-
-         By default dynamic tick is disabled during the boot, and can be
-         manually enabled with:
-
-           echo 1 > /sys/devices/system/timer/timer0/dyn_tick
-
-         Alternatively, if you want dynamic tick automatically enabled
-         during boot, pass "dyntick=enable" via the kernel command string.
-
-         Please note that dynamic tick may affect the accuracy of
-         timekeeping on some platforms depending on the implementation.
-
 config SH_PCLK_FREQ
        int "Peripheral clock frequency (in Hz)"
        default "27000000" if CPU_SUBTYPE_SH73180 || CPU_SUBTYPE_SH7343
@@ -509,6 +492,8 @@ config SH_CLK_MD
        help
          MD2 - MD0 pin setting.
 
+source "kernel/time/Kconfig"
+
 endmenu
 
 menu "CPU Frequency scaling"
index d755589ba8b1491ee9ddaab76902525109386b61..6b4f5748d0be682a2b6334ca7d6f5ccc406be271 100644 (file)
@@ -16,6 +16,7 @@
 #include <linux/kallsyms.h>
 #include <linux/kexec.h>
 #include <linux/kdebug.h>
+#include <linux/tick.h>
 #include <asm/uaccess.h>
 #include <asm/mmu_context.h>
 #include <asm/pgalloc.h>
@@ -60,8 +61,10 @@ void cpu_idle(void)
                if (!idle)
                        idle = default_idle;
 
+               tick_nohz_stop_sched_tick();
                while (!need_resched())
                        idle();
+               tick_nohz_restart_sched_tick();
 
                preempt_enable_no_resched();
                schedule();
index d47e775962e955054f8e0296f4f3a5fdd65377e5..a3a67d151e520285b08c7fd58cc93d618e079fe6 100644 (file)
@@ -3,7 +3,7 @@
  *
  *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
  *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
- *  Copyright (C) 2002 - 2006  Paul Mundt
+ *  Copyright (C) 2002 - 2007  Paul Mundt
  *  Copyright (C) 2002  M. R. Brown  <mrbrown@linux-sh.org>
  *
  *  Some code taken from i386 version.
@@ -15,6 +15,7 @@
 #include <linux/profile.h>
 #include <linux/timex.h>
 #include <linux/sched.h>
+#include <linux/clockchips.h>
 #include <asm/clock.h>
 #include <asm/rtc.h>
 #include <asm/timer.h>
@@ -38,6 +39,14 @@ static int null_rtc_set_time(const time_t secs)
        return 0;
 }
 
+/*
+ * Null high precision timer functions for systems lacking one.
+ */
+static cycle_t null_hpt_read(void)
+{
+       return 0;
+}
+
 void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time;
 int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time;
 
@@ -101,6 +110,7 @@ int do_settimeofday(struct timespec *tv)
 EXPORT_SYMBOL(do_settimeofday);
 #endif /* !CONFIG_GENERIC_TIME */
 
+#ifndef CONFIG_GENERIC_CLOCKEVENTS
 /* last time the RTC clock got updated */
 static long last_rtc_update;
 
@@ -138,6 +148,7 @@ void handle_timer_tick(void)
                        last_rtc_update = xtime.tv_sec - 600;
        }
 }
+#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
 
 #ifdef CONFIG_PM
 int timer_suspend(struct sys_device *dev, pm_message_t state)
@@ -168,136 +179,58 @@ static struct sysdev_class timer_sysclass = {
        .resume  = timer_resume,
 };
 
-#ifdef CONFIG_NO_IDLE_HZ
-static int timer_dyn_tick_enable(void)
+static int __init timer_init_sysfs(void)
 {
-       struct dyn_tick_timer *dyn_tick = sys_timer->dyn_tick;
-       unsigned long flags;
-       int ret = -ENODEV;
-
-       if (dyn_tick) {
-               spin_lock_irqsave(&dyn_tick->lock, flags);
-               ret = 0;
-               if (!(dyn_tick->state & DYN_TICK_ENABLED)) {
-                       ret = dyn_tick->enable();
-
-                       if (ret == 0)
-                               dyn_tick->state |= DYN_TICK_ENABLED;
-               }
-               spin_unlock_irqrestore(&dyn_tick->lock, flags);
-       }
+       int ret = sysdev_class_register(&timer_sysclass);
+       if (ret != 0)
+               return ret;
 
-       return ret;
+       sys_timer->dev.cls = &timer_sysclass;
+       return sysdev_register(&sys_timer->dev);
 }
+device_initcall(timer_init_sysfs);
 
-static int timer_dyn_tick_disable(void)
-{
-       struct dyn_tick_timer *dyn_tick = sys_timer->dyn_tick;
-       unsigned long flags;
-       int ret = -ENODEV;
-
-       if (dyn_tick) {
-               spin_lock_irqsave(&dyn_tick->lock, flags);
-               ret = 0;
-               if (dyn_tick->state & DYN_TICK_ENABLED) {
-                       ret = dyn_tick->disable();
-
-                       if (ret == 0)
-                               dyn_tick->state &= ~DYN_TICK_ENABLED;
-               }
-               spin_unlock_irqrestore(&dyn_tick->lock, flags);
-       }
-
-       return ret;
-}
+void (*board_time_init)(void);
 
 /*
- * Reprogram the system timer for at least the calculated time interval.
- * This function should be called from the idle thread with IRQs disabled,
- * immediately before sleeping.
+ * Shamelessly based on the MIPS and Sparc64 work.
  */
-void timer_dyn_reprogram(void)
-{
-       struct dyn_tick_timer *dyn_tick = sys_timer->dyn_tick;
-       unsigned long next, seq, flags;
-
-       if (!dyn_tick)
-               return;
-
-       spin_lock_irqsave(&dyn_tick->lock, flags);
-       if (dyn_tick->state & DYN_TICK_ENABLED) {
-               next = next_timer_interrupt();
-               do {
-                       seq = read_seqbegin(&xtime_lock);
-                       dyn_tick->reprogram(next - jiffies);
-               } while (read_seqretry(&xtime_lock, seq));
-       }
-       spin_unlock_irqrestore(&dyn_tick->lock, flags);
-}
+static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
+unsigned long sh_hpt_frequency = 0;
+
+#define NSEC_PER_CYC_SHIFT     10
+
+struct clocksource clocksource_sh = {
+       .name           = "SuperH",
+       .rating         = 200,
+       .mask           = CLOCKSOURCE_MASK(32),
+       .read           = null_hpt_read,
+       .shift          = 16,
+       .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
+};
 
-static ssize_t timer_show_dyn_tick(struct sys_device *dev, char *buf)
+static void __init init_sh_clocksource(void)
 {
-       return sprintf(buf, "%i\n",
-                      (sys_timer->dyn_tick->state & DYN_TICK_ENABLED) >> 1);
-}
+       if (!sh_hpt_frequency || clocksource_sh.read == null_hpt_read)
+               return;
 
-static ssize_t timer_set_dyn_tick(struct sys_device *dev, const char *buf,
-                                 size_t count)
-{
-       unsigned int enable = simple_strtoul(buf, NULL, 2);
+       clocksource_sh.mult = clocksource_hz2mult(sh_hpt_frequency,
+                                                 clocksource_sh.shift);
 
-       if (enable)
-               timer_dyn_tick_enable();
-       else
-               timer_dyn_tick_disable();
+       timer_ticks_per_nsec_quotient =
+               clocksource_hz2mult(sh_hpt_frequency, NSEC_PER_CYC_SHIFT);
 
-       return count;
+       clocksource_register(&clocksource_sh);
 }
-static SYSDEV_ATTR(dyn_tick, 0644, timer_show_dyn_tick, timer_set_dyn_tick);
 
-/*
- * dyntick=enable|disable
- */
-static char dyntick_str[4] __initdata = "";
-
-static int __init dyntick_setup(char *str)
+#ifdef CONFIG_GENERIC_TIME
+unsigned long long sched_clock(void)
 {
-       if (str)
-               strlcpy(dyntick_str, str, sizeof(dyntick_str));
-       return 1;
+       unsigned long long ticks = clocksource_sh.read();
+       return (ticks * timer_ticks_per_nsec_quotient) >> NSEC_PER_CYC_SHIFT;
 }
-
-__setup("dyntick=", dyntick_setup);
-#endif
-
-static int __init timer_init_sysfs(void)
-{
-       int ret = sysdev_class_register(&timer_sysclass);
-       if (ret != 0)
-               return ret;
-
-       sys_timer->dev.cls = &timer_sysclass;
-       ret = sysdev_register(&sys_timer->dev);
-
-#ifdef CONFIG_NO_IDLE_HZ
-       if (ret == 0 && sys_timer->dyn_tick) {
-               ret = sysdev_create_file(&sys_timer->dev, &attr_dyn_tick);
-
-               /*
-                * Turn on dynamic tick after calibrate delay
-                * for correct bogomips
-                */
-               if (ret == 0 && dyntick_str[0] == 'e')
-                       ret = timer_dyn_tick_enable();
-       }
 #endif
 
-       return ret;
-}
-device_initcall(timer_init_sysfs);
-
-void (*board_time_init)(void);
-
 void __init time_init(void)
 {
        if (board_time_init)
@@ -316,10 +249,15 @@ void __init time_init(void)
        sys_timer = get_sys_timer();
        printk(KERN_INFO "Using %s for system timer\n", sys_timer->name);
 
-#ifdef CONFIG_NO_IDLE_HZ
-       if (sys_timer->dyn_tick)
-               spin_lock_init(&sys_timer->dyn_tick->lock);
-#endif
+       if (sys_timer->ops->read)
+               clocksource_sh.read = sys_timer->ops->read;
+
+       init_sh_clocksource();
+
+       if (sh_hpt_frequency)
+               printk("Using %lu.%03lu MHz high precision timer.\n",
+                      ((sh_hpt_frequency + 500) / 1000) / 1000,
+                      ((sh_hpt_frequency + 500) / 1000) % 1000);
 
 #if defined(CONFIG_SH_KGDB)
        /*
index d9e3151c891e9cd197aaa87e4f6efe2d7f81e73c..2d997e2a5b6cc6a0961810c8b02beb49df44efac 100644 (file)
@@ -1,7 +1,7 @@
 /*
  * arch/sh/kernel/timers/timer-tmu.c - TMU Timer Support
  *
- *  Copyright (C) 2005  Paul Mundt
+ *  Copyright (C) 2005 - 2007  Paul Mundt
  *
  * TMU handling code hacked out of arch/sh/kernel/time.c
  *
@@ -18,6 +18,7 @@
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/seqlock.h>
+#include <linux/clockchips.h>
 #include <asm/timer.h>
 #include <asm/rtc.h>
 #include <asm/io.h>
 #include <asm/clock.h>
 
 #define TMU_TOCR_INIT  0x00
-#define TMU0_TCR_INIT  0x0020
-#define TMU_TSTR_INIT  1
+#define TMU_TCR_INIT   0x0020
 
-#define TMU0_TCR_CALIB 0x0000
+static int tmu_timer_start(void)
+{
+       ctrl_outb(ctrl_inb(TMU_TSTR) | 0x3, TMU_TSTR);
+       return 0;
+}
 
-static unsigned long tmu_timer_get_offset(void)
+static void tmu0_timer_set_interval(unsigned long interval, unsigned int reload)
 {
-       int count;
-       static int count_p = 0x7fffffff;    /* for the first call after boot */
-       static unsigned long jiffies_p = 0;
+       ctrl_outl(interval, TMU0_TCNT);
 
        /*
-        * cache volatile jiffies temporarily; we have IRQs turned off.
+        * TCNT reloads from TCOR on underflow, clear it if we don't
+        * intend to auto-reload
         */
-       unsigned long jiffies_t;
+       if (reload)
+               ctrl_outl(interval, TMU0_TCOR);
+       else
+               ctrl_outl(0, TMU0_TCOR);
 
-       /* timer count may underflow right here */
-       count = ctrl_inl(TMU0_TCNT);    /* read the latched count */
+       tmu_timer_start();
+}
 
-       jiffies_t = jiffies;
+static int tmu_timer_stop(void)
+{
+       ctrl_outb(ctrl_inb(TMU_TSTR) & ~0x3, TMU_TSTR);
+       return 0;
+}
 
-       /*
-        * avoiding timer inconsistencies (they are rare, but they happen)...
-        * there is one kind of problem that must be avoided here:
-        *  1. the timer counter underflows
-        */
+static cycle_t tmu_timer_read(void)
+{
+       return ~ctrl_inl(TMU1_TCNT);
+}
+
+static int tmu_set_next_event(unsigned long cycles,
+                             struct clock_event_device *evt)
+{
+       tmu0_timer_set_interval(cycles, 1);
+       return 0;
+}
 
-       if (jiffies_t == jiffies_p) {
-               if (count > count_p) {
-                       /* the nutcase */
-                       if (ctrl_inw(TMU0_TCR) & 0x100) { /* Check UNF bit */
-                               count -= LATCH;
-                       } else {
-                               printk("%s (): hardware timer problem?\n",
-                                      __FUNCTION__);
-                       }
-               }
-       } else
-               jiffies_p = jiffies_t;
-
-       count_p = count;
-
-       count = ((LATCH-1) - count) * TICK_SIZE;
-       count = (count + LATCH/2) / LATCH;
-
-       return count;
+static void tmu_set_mode(enum clock_event_mode mode,
+                        struct clock_event_device *evt)
+{
+       switch (mode) {
+       case CLOCK_EVT_MODE_PERIODIC:
+               ctrl_outl(ctrl_inl(TMU0_TCNT), TMU0_TCOR);
+               break;
+       case CLOCK_EVT_MODE_ONESHOT:
+               ctrl_outl(0, TMU0_TCOR);
+               break;
+       case CLOCK_EVT_MODE_UNUSED:
+       case CLOCK_EVT_MODE_SHUTDOWN:
+               break;
+       }
 }
 
+static struct clock_event_device tmu0_clockevent = {
+       .name           = "tmu0",
+       .shift          = 32,
+       .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+       .set_mode       = tmu_set_mode,
+       .set_next_event = tmu_set_next_event,
+};
+
 static irqreturn_t tmu_timer_interrupt(int irq, void *dummy)
 {
+       struct clock_event_device *evt = &tmu0_clockevent;
        unsigned long timer_status;
 
        /* Clear UNF bit */
@@ -82,72 +102,76 @@ static irqreturn_t tmu_timer_interrupt(int irq, void *dummy)
        timer_status &= ~0x100;
        ctrl_outw(timer_status, TMU0_TCR);
 
-       /*
-        * Here we are in the timer irq handler. We just have irqs locally
-        * disabled but we don't know if the timer_bh is running on the other
-        * CPU. We need to avoid to SMP race with it. NOTE: we don' t need
-        * the irq version of write_lock because as just said we have irq
-        * locally disabled. -arca
-        */
-       write_seqlock(&xtime_lock);
-       handle_timer_tick();
-       write_sequnlock(&xtime_lock);
+       evt->event_handler(evt);
 
        return IRQ_HANDLED;
 }
 
-static struct irqaction tmu_irq = {
-       .name           = "timer",
+static struct irqaction tmu0_irq = {
+       .name           = "periodic timer",
        .handler        = tmu_timer_interrupt,
        .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
        .mask           = CPU_MASK_NONE,
 };
 
-static void tmu_clk_init(struct clk *clk)
+static void tmu0_clk_init(struct clk *clk)
 {
-       u8 divisor = TMU0_TCR_INIT & 0x7;
-       ctrl_outw(TMU0_TCR_INIT, TMU0_TCR);
+       u8 divisor = TMU_TCR_INIT & 0x7;
+       ctrl_outw(TMU_TCR_INIT, TMU0_TCR);
        clk->rate = clk->parent->rate / (4 << (divisor << 1));
 }
 
-static void tmu_clk_recalc(struct clk *clk)
+static void tmu0_clk_recalc(struct clk *clk)
 {
        u8 divisor = ctrl_inw(TMU0_TCR) & 0x7;
        clk->rate = clk->parent->rate / (4 << (divisor << 1));
 }
 
-static struct clk_ops tmu_clk_ops = {
-       .init           = tmu_clk_init,
-       .recalc         = tmu_clk_recalc,
+static struct clk_ops tmu0_clk_ops = {
+       .init           = tmu0_clk_init,
+       .recalc         = tmu0_clk_recalc,
 };
 
 static struct clk tmu0_clk = {
        .name           = "tmu0_clk",
-       .ops            = &tmu_clk_ops,
+       .ops            = &tmu0_clk_ops,
 };
 
-static int tmu_timer_start(void)
+static void tmu1_clk_init(struct clk *clk)
 {
-       ctrl_outb(TMU_TSTR_INIT, TMU_TSTR);
-       return 0;
+       u8 divisor = TMU_TCR_INIT & 0x7;
+       ctrl_outw(divisor, TMU1_TCR);
+       clk->rate = clk->parent->rate / (4 << (divisor << 1));
 }
 
-static int tmu_timer_stop(void)
+static void tmu1_clk_recalc(struct clk *clk)
 {
-       ctrl_outb(0, TMU_TSTR);
-       return 0;
+       u8 divisor = ctrl_inw(TMU1_TCR) & 0x7;
+       clk->rate = clk->parent->rate / (4 << (divisor << 1));
 }
 
+static struct clk_ops tmu1_clk_ops = {
+       .init           = tmu1_clk_init,
+       .recalc         = tmu1_clk_recalc,
+};
+
+static struct clk tmu1_clk = {
+       .name           = "tmu1_clk",
+       .ops            = &tmu1_clk_ops,
+};
+
 static int tmu_timer_init(void)
 {
        unsigned long interval;
+       unsigned long frequency;
 
-       setup_irq(CONFIG_SH_TIMER_IRQ, &tmu_irq);
+       setup_irq(CONFIG_SH_TIMER_IRQ, &tmu0_irq);
 
        tmu0_clk.parent = clk_get(NULL, "module_clk");
+       tmu1_clk.parent = clk_get(NULL, "module_clk");
 
-       /* Start TMU0 */
        tmu_timer_stop();
+
 #if !defined(CONFIG_CPU_SUBTYPE_SH7300) && \
     !defined(CONFIG_CPU_SUBTYPE_SH7760) && \
     !defined(CONFIG_CPU_SUBTYPE_SH7785)
@@ -155,15 +179,29 @@ static int tmu_timer_init(void)
 #endif
 
        clk_register(&tmu0_clk);
+       clk_register(&tmu1_clk);
        clk_enable(&tmu0_clk);
+       clk_enable(&tmu1_clk);
 
-       interval = (clk_get_rate(&tmu0_clk) + HZ / 2) / HZ;
-       printk(KERN_INFO "Interval = %ld\n", interval);
+       frequency = clk_get_rate(&tmu0_clk);
+       interval = (frequency + HZ / 2) / HZ;
 
-       ctrl_outl(interval, TMU0_TCOR);
-       ctrl_outl(interval, TMU0_TCNT);
+       sh_hpt_frequency = clk_get_rate(&tmu1_clk);
+       ctrl_outl(~0, TMU1_TCNT);
+       ctrl_outl(~0, TMU1_TCOR);
 
-       tmu_timer_start();
+       tmu0_timer_set_interval(interval, 1);
+
+       tmu0_clockevent.mult = div_sc(frequency, NSEC_PER_SEC,
+                                     tmu0_clockevent.shift);
+       tmu0_clockevent.max_delta_ns =
+                       clockevent_delta2ns(-1, &tmu0_clockevent);
+       tmu0_clockevent.min_delta_ns =
+                       clockevent_delta2ns(1, &tmu0_clockevent);
+
+       tmu0_clockevent.cpumask = cpumask_of_cpu(0);
+
+       clockevents_register_device(&tmu0_clockevent);
 
        return 0;
 }
@@ -172,9 +210,7 @@ struct sys_timer_ops tmu_timer_ops = {
        .init           = tmu_timer_init,
        .start          = tmu_timer_start,
        .stop           = tmu_timer_stop,
-#ifndef CONFIG_GENERIC_TIME
-       .get_offset     = tmu_timer_get_offset,
-#endif
+       .read           = tmu_timer_read,
 };
 
 struct sys_timer tmu_timer = {
index 17b5e76a4c3131471599b52bb3aea12ce78aad43..701ba84c7049305dd1e763efe671bfbf15ed9439 100644 (file)
@@ -2,12 +2,14 @@
 #define __ASM_SH_TIMER_H
 
 #include <linux/sysdev.h>
+#include <linux/clocksource.h>
 #include <asm/cpu/timer.h>
 
 struct sys_timer_ops {
        int (*init)(void);
        int (*start)(void);
        int (*stop)(void);
+       cycle_t (*read)(void);
 #ifndef CONFIG_GENERIC_TIME
        unsigned long (*get_offset)(void);
 #endif
@@ -18,29 +20,8 @@ struct sys_timer {
 
        struct sys_device       dev;
        struct sys_timer_ops    *ops;
-
-#ifdef CONFIG_NO_IDLE_HZ
-       struct dyn_tick_timer   *dyn_tick;
-#endif
 };
 
-#ifdef CONFIG_NO_IDLE_HZ
-#define DYN_TICK_ENABLED       (1 << 1)
-
-struct dyn_tick_timer {
-       spinlock_t      lock;
-       unsigned int    state;                  /* Current state */
-       int             (*enable)(void);        /* Enables dynamic tick */
-       int             (*disable)(void);       /* Disables dynamic tick */
-       void            (*reprogram)(unsigned long); /* Reprograms the timer */
-       int             (*handler)(int, void *);
-};
-
-void timer_dyn_reprogram(void);
-#else
-#define timer_dyn_reprogram()  do { } while (0)
-#endif
-
 #define TICK_SIZE (tick_nsec / 1000)
 
 extern struct sys_timer tmu_timer, cmt_timer, mtu2_timer;
@@ -58,5 +39,7 @@ struct sys_timer *get_sys_timer(void);
 
 /* arch/sh/kernel/time.c */
 void handle_timer_tick(void);
+extern unsigned long sh_hpt_frequency;
+extern struct clocksource clocksource_sh;
 
 #endif /* __ASM_SH_TIMER_H */