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MN10300: Generic time support

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Implement generic time support for MN10300.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Mark Salter
2010-10-27 17:28:57 +01:00
committed by David Howells
parent 2502c64eeb
commit 730c1fad0e
12 changed files with 411 additions and 125 deletions
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79
arch/mn10300/kernel/time.c
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@@ -17,6 +17,8 @@
#include <linux/smp.h>
#include <linux/profile.h>
#include <linux/cnt32_to_63.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <asm/irq.h>
#include <asm/div64.h>
#include <asm/processor.h>
@@ -27,14 +29,6 @@
static unsigned long mn10300_last_tsc; /* time-stamp counter at last time
* interrupt occurred */
static irqreturn_t timer_interrupt(int irq, void *dev_id);
static struct irqaction timer_irq = {
.handler = timer_interrupt,
.flags = IRQF_DISABLED | IRQF_SHARED | IRQF_TIMER,
.name = "timer",
};
static unsigned long sched_clock_multiplier;
/*
@@ -54,7 +48,7 @@ unsigned long long sched_clock(void)
/* read the TSC value
*/
tsc = 0 - get_cycles(); /* get_cycles() counts down */
tsc = get_cycles();
/* expand to 64-bits.
* - sched_clock() must be called once a minute or better or the
@@ -103,6 +97,7 @@ irqreturn_t local_timer_interrupt(void)
return IRQ_HANDLED;
}
#ifndef CONFIG_GENERIC_TIME
/*
* advance the kernel's time keeping clocks (xtime and jiffies)
* - we use Timer 0 & 1 cascaded as a clock to nudge us the next time
@@ -116,11 +111,11 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
write_seqlock(&xtime_lock);
while (tsc = get_cycles(),
elapse = mn10300_last_tsc - tsc, /* time elapsed since last
elapse = tsc - mn10300_last_tsc, /* time elapsed since last
* tick */
elapse > MN10300_TSC_PER_HZ
) {
mn10300_last_tsc -= MN10300_TSC_PER_HZ;
mn10300_last_tsc += MN10300_TSC_PER_HZ;
/* advance the kernel's time tracking system */
do_timer(1);
@@ -135,6 +130,50 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
return ret;
}
static struct irqaction timer_irq = {
.handler = timer_interrupt,
.flags = IRQF_DISABLED | IRQF_SHARED | IRQF_TIMER,
.name = "timer",
};
#endif /* CONFIG_GENERIC_TIME */
#ifdef CONFIG_CSRC_MN10300
void __init clocksource_set_clock(struct clocksource *cs, unsigned int clock)
{
u64 temp;
u32 shift;
/* Find a shift value */
for (shift = 32; shift > 0; shift--) {
temp = (u64) NSEC_PER_SEC << shift;
do_div(temp, clock);
if ((temp >> 32) == 0)
break;
}
cs->shift = shift;
cs->mult = (u32) temp;
}
#endif
#if CONFIG_CEVT_MN10300
void __cpuinit clockevent_set_clock(struct clock_event_device *cd,
unsigned int clock)
{
u64 temp;
u32 shift;
/* Find a shift value */
for (shift = 32; shift > 0; shift--) {
temp = (u64) clock << shift;
do_div(temp, NSEC_PER_SEC);
if ((temp >> 32) == 0)
break;
}
cd->shift = shift;
cd->mult = (u32) temp;
}
#endif
/*
* initialise the various timers used by the main part of the kernel
*/
@@ -146,21 +185,25 @@ void __init time_init(void)
*/
TMPSCNT |= TMPSCNT_ENABLE;
#ifdef CONFIG_GENERIC_TIME
init_clocksource();
#else
startup_timestamp_counter();
#endif
printk(KERN_INFO
"timestamp counter I/O clock running at %lu.%02lu"
" (calibrated against RTC)\n",
MN10300_TSCCLK / 1000000, (MN10300_TSCCLK / 10000) % 100);
mn10300_last_tsc = TMTSCBC;
mn10300_last_tsc = read_timestamp_counter();
/* use timer 0 & 1 cascaded to tick at as close to HZ as possible */
setup_irq(TMJCIRQ, &timer_irq);
set_intr_level(TMJCIRQ, NUM2GxICR_LEVEL(CONFIG_TIMER_IRQ_LEVEL));
startup_jiffies_counter();
#ifdef CONFIG_GENERIC_CLOCKEVENTS
init_clockevents();
#else
reload_jiffies_counter(MN10300_JC_PER_HZ - 1);
setup_jiffies_interrupt(TMJCIRQ, &timer_irq, CONFIG_TIMER_IRQ_LEVEL);
#endif
#ifdef CONFIG_MN10300_WD_TIMER
/* start the watchdog timer */