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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:51:02 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:51:02 -0700
commit32c15bb978c0e6ff65b3012a6af5a14c899005ce (patch)
tree29b40c7dc083a1f0e3fb199963e88bb73c8b6ea7 /arch/mips/kernel/time.c
parent53253383fde9e41bc07ad4d99f1c8b537fef71d6 (diff)
parent42f77542f4a1c104bb6fbba2e18e04e84415a96b (diff)
Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus
* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: [MIPS] time: Move R4000 clockevent device code to separate configurable file [MIPS] time: Delete dead cycles_per_jiffy, mips_timer_ack and null_timer_ack [MIPS] IP32: Retire use of plat_timer_setup. [MIPS] Jazz: Retire use of plat_timer_setup. [MIPS] IP27: Convert to clock_event_device. [MIPS] JMR3927: Convert to clock_event_device. [MIPS] Always do the ARC64_TWIDDLE_PC thing.
Diffstat (limited to 'arch/mips/kernel/time.c')
-rw-r--r--arch/mips/kernel/time.c262
1 files changed, 0 insertions, 262 deletions
diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index e4b5e647b14..ea7cfe766a8 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -72,14 +72,6 @@ int update_persistent_clock(struct timespec now)
return rtc_mips_set_mmss(now.tv_sec);
}
-/* how many counter cycles in a jiffy */
-static unsigned long cycles_per_jiffy __read_mostly;
-
-/*
- * Null timer ack for systems not needing one (e.g. i8254).
- */
-static void null_timer_ack(void) { /* nothing */ }
-
/*
* Null high precision timer functions for systems lacking one.
*/
@@ -89,14 +81,6 @@ static cycle_t null_hpt_read(void)
}
/*
- * Timer ack for an R4k-compatible timer of a known frequency.
- */
-static void c0_timer_ack(void)
-{
- write_c0_compare(read_c0_compare());
-}
-
-/*
* High precision timer functions for a R4k-compatible timer.
*/
static cycle_t c0_hpt_read(void)
@@ -105,7 +89,6 @@ static cycle_t c0_hpt_read(void)
}
int (*mips_timer_state)(void);
-void (*mips_timer_ack)(void);
/*
* local_timer_interrupt() does profiling and process accounting
@@ -135,35 +118,6 @@ int (*perf_irq)(void) = null_perf_irq;
EXPORT_SYMBOL(perf_irq);
/*
- * Timer interrupt
- */
-int cp0_compare_irq;
-
-/*
- * Performance counter IRQ or -1 if shared with timer
- */
-int cp0_perfcount_irq;
-EXPORT_SYMBOL_GPL(cp0_perfcount_irq);
-
-/*
- * Possibly handle a performance counter interrupt.
- * Return true if the timer interrupt should not be checked
- */
-static inline int handle_perf_irq(int r2)
-{
- /*
- * The performance counter overflow interrupt may be shared with the
- * timer interrupt (cp0_perfcount_irq < 0). If it is and a
- * performance counter has overflowed (perf_irq() == IRQ_HANDLED)
- * and we can't reliably determine if a counter interrupt has also
- * happened (!r2) then don't check for a timer interrupt.
- */
- return (cp0_perfcount_irq < 0) &&
- perf_irq() == IRQ_HANDLED &&
- !r2;
-}
-
-/*
* time_init() - it does the following things.
*
* 1) plat_time_init() -
@@ -228,84 +182,6 @@ struct clocksource clocksource_mips = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
-static int mips_next_event(unsigned long delta,
- struct clock_event_device *evt)
-{
- unsigned int cnt;
- int res;
-
-#ifdef CONFIG_MIPS_MT_SMTC
- {
- unsigned long flags, vpflags;
- local_irq_save(flags);
- vpflags = dvpe();
-#endif
- cnt = read_c0_count();
- cnt += delta;
- write_c0_compare(cnt);
- res = ((long)(read_c0_count() - cnt ) > 0) ? -ETIME : 0;
-#ifdef CONFIG_MIPS_MT_SMTC
- evpe(vpflags);
- local_irq_restore(flags);
- }
-#endif
- return res;
-}
-
-static void mips_set_mode(enum clock_event_mode mode,
- struct clock_event_device *evt)
-{
- /* Nothing to do ... */
-}
-
-static DEFINE_PER_CPU(struct clock_event_device, mips_clockevent_device);
-static int cp0_timer_irq_installed;
-
-static irqreturn_t timer_interrupt(int irq, void *dev_id)
-{
- const int r2 = cpu_has_mips_r2;
- struct clock_event_device *cd;
- int cpu = smp_processor_id();
-
- /*
- * Suckage alert:
- * Before R2 of the architecture there was no way to see if a
- * performance counter interrupt was pending, so we have to run
- * the performance counter interrupt handler anyway.
- */
- if (handle_perf_irq(r2))
- goto out;
-
- /*
- * The same applies to performance counter interrupts. But with the
- * above we now know that the reason we got here must be a timer
- * interrupt. Being the paranoiacs we are we check anyway.
- */
- if (!r2 || (read_c0_cause() & (1 << 30))) {
- c0_timer_ack();
-#ifdef CONFIG_MIPS_MT_SMTC
- if (cpu_data[cpu].vpe_id)
- goto out;
- cpu = 0;
-#endif
- cd = &per_cpu(mips_clockevent_device, cpu);
- cd->event_handler(cd);
- }
-
-out:
- return IRQ_HANDLED;
-}
-
-static struct irqaction timer_irqaction = {
- .handler = timer_interrupt,
-#ifdef CONFIG_MIPS_MT_SMTC
- .flags = IRQF_DISABLED,
-#else
- .flags = IRQF_DISABLED | IRQF_PERCPU,
-#endif
- .name = "timer",
-};
-
static void __init init_mips_clocksource(void)
{
u64 temp;
@@ -345,8 +221,6 @@ static void smtc_set_mode(enum clock_event_mode mode,
{
}
-int dummycnt[NR_CPUS];
-
static void mips_broadcast(cpumask_t mask)
{
unsigned int cpu;
@@ -387,113 +261,6 @@ static void setup_smtc_dummy_clockevent_device(void)
}
#endif
-static void mips_event_handler(struct clock_event_device *dev)
-{
-}
-
-/*
- * FIXME: This doesn't hold for the relocated E9000 compare interrupt.
- */
-static int c0_compare_int_pending(void)
-{
- return (read_c0_cause() >> cp0_compare_irq) & 0x100;
-}
-
-static int c0_compare_int_usable(void)
-{
- const unsigned int delta = 0x300000;
- unsigned int cnt;
-
- /*
- * IP7 already pending? Try to clear it by acking the timer.
- */
- if (c0_compare_int_pending()) {
- write_c0_compare(read_c0_compare());
- irq_disable_hazard();
- if (c0_compare_int_pending())
- return 0;
- }
-
- cnt = read_c0_count();
- cnt += delta;
- write_c0_compare(cnt);
-
- while ((long)(read_c0_count() - cnt) <= 0)
- ; /* Wait for expiry */
-
- if (!c0_compare_int_pending())
- return 0;
-
- write_c0_compare(read_c0_compare());
- irq_disable_hazard();
- if (c0_compare_int_pending())
- return 0;
-
- /*
- * Feels like a real count / compare timer.
- */
- return 1;
-}
-
-void __cpuinit mips_clockevent_init(void)
-{
- uint64_t mips_freq = mips_hpt_frequency;
- unsigned int cpu = smp_processor_id();
- struct clock_event_device *cd;
- unsigned int irq = MIPS_CPU_IRQ_BASE + 7;
-
- if (!cpu_has_counter)
- return;
-
-#ifdef CONFIG_MIPS_MT_SMTC
- setup_smtc_dummy_clockevent_device();
-
- /*
- * On SMTC we only register VPE0's compare interrupt as clockevent
- * device.
- */
- if (cpu)
- return;
-#endif
-
- if (!c0_compare_int_usable())
- return;
-
- cd = &per_cpu(mips_clockevent_device, cpu);
-
- cd->name = "MIPS";
- cd->features = CLOCK_EVT_FEAT_ONESHOT;
-
- /* Calculate the min / max delta */
- cd->mult = div_sc((unsigned long) mips_freq, NSEC_PER_SEC, 32);
- cd->shift = 32;
- cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
- cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
-
- cd->rating = 300;
- cd->irq = irq;
-#ifdef CONFIG_MIPS_MT_SMTC
- cd->cpumask = CPU_MASK_ALL;
-#else
- cd->cpumask = cpumask_of_cpu(cpu);
-#endif
- cd->set_next_event = mips_next_event;
- cd->set_mode = mips_set_mode;
- cd->event_handler = mips_event_handler;
-
- clockevents_register_device(cd);
-
- if (!cp0_timer_irq_installed) {
-#ifdef CONFIG_MIPS_MT_SMTC
-#define CPUCTR_IMASKBIT (0x100 << cp0_compare_irq)
- setup_irq_smtc(irq, &timer_irqaction, CPUCTR_IMASKBIT);
-#else
- setup_irq(irq, &timer_irqaction);
-#endif /* CONFIG_MIPS_MT_SMTC */
- cp0_timer_irq_installed = 1;
- }
-}
-
void __init time_init(void)
{
plat_time_init();
@@ -512,14 +279,6 @@ void __init time_init(void)
if (!clocksource_mips.read) {
/* No external high precision timer -- use R4k. */
clocksource_mips.read = c0_hpt_read;
-
- if (!mips_timer_state) {
- /* No external timer interrupt -- use R4k. */
- mips_timer_ack = c0_timer_ack;
- /* Calculate cache parameters. */
- cycles_per_jiffy =
- (mips_hpt_frequency + HZ / 2) / HZ;
- }
}
if (!mips_hpt_frequency)
mips_hpt_frequency = calibrate_hpt();
@@ -528,29 +287,8 @@ void __init time_init(void)
printk("Using %u.%03u MHz high precision timer.\n",
((mips_hpt_frequency + 500) / 1000) / 1000,
((mips_hpt_frequency + 500) / 1000) % 1000);
-
-#ifdef CONFIG_IRQ_CPU
- setup_irq(MIPS_CPU_IRQ_BASE + 7, &timer_irqaction);
-#endif
}
- if (!mips_timer_ack)
- /* No timer interrupt ack (e.g. i8254). */
- mips_timer_ack = null_timer_ack;
-
- /*
- * Call board specific timer interrupt setup.
- *
- * this pointer must be setup in machine setup routine.
- *
- * Even if a machine chooses to use a low-level timer interrupt,
- * it still needs to setup the timer_irqaction.
- * In that case, it might be better to set timer_irqaction.handler
- * to be NULL function so that we are sure the high-level code
- * is not invoked accidentally.
- */
- plat_timer_setup(&timer_irqaction);
-
init_mips_clocksource();
mips_clockevent_init();
}