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/**
* @file timer_int.c
*
* @remark Copyright 2002 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
*/
#include <linux/kernel.h>
#include <linux/notifier.h>
#include <linux/smp.h>
#include <linux/oprofile.h>
#include <linux/profile.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/hrtimer.h>
#include <asm/irq_regs.h>
#include <asm/ptrace.h>
/* 2013-01-14 YJChen: Add Begin */
#include <asm/mach/irq.h>
#include <linux/rtc.h>
#include <mach/hardware.h>
/* 2013-01-14 YJChen: Add End */
#include "oprof.h"
static DEFINE_PER_CPU(struct hrtimer, oprofile_hrtimer);
static int ctr_running;
static enum hrtimer_restart oprofile_hrtimer_notify(struct hrtimer *hrtimer)
{
oprofile_add_sample(get_irq_regs(), 0);
hrtimer_forward_now(hrtimer, ns_to_ktime(TICK_NSEC));
return HRTIMER_RESTART;
}
static void __oprofile_hrtimer_start(void *unused)
{
struct hrtimer *hrtimer = &__get_cpu_var(oprofile_hrtimer);
if (!ctr_running)
return;
hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer->function = oprofile_hrtimer_notify;
hrtimer_start(hrtimer, ns_to_ktime(TICK_NSEC),
HRTIMER_MODE_REL_PINNED);
}
static int oprofile_hrtimer_start(void)
{
get_online_cpus();
ctr_running = 1;
on_each_cpu(__oprofile_hrtimer_start, NULL, 1);
put_online_cpus();
return 0;
}
static void __oprofile_hrtimer_stop(int cpu)
{
struct hrtimer *hrtimer = &per_cpu(oprofile_hrtimer, cpu);
if (!ctr_running)
return;
hrtimer_cancel(hrtimer);
}
static void oprofile_hrtimer_stop(void)
{
int cpu;
get_online_cpus();
for_each_online_cpu(cpu)
__oprofile_hrtimer_stop(cpu);
ctr_running = 0;
put_online_cpus();
}
static int __cpuinit oprofile_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
long cpu = (long) hcpu;
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
smp_call_function_single(cpu, __oprofile_hrtimer_start,
NULL, 1);
break;
case CPU_DEAD:
case CPU_DEAD_FROZEN:
__oprofile_hrtimer_stop(cpu);
break;
}
return NOTIFY_OK;
}
static struct notifier_block __refdata oprofile_cpu_notifier = {
.notifier_call = oprofile_cpu_notify,
};
static int oprofile_hrtimer_setup(void)
{
return register_hotcpu_notifier(&oprofile_cpu_notifier);
}
static void oprofile_hrtimer_shutdown(void)
{
unregister_hotcpu_notifier(&oprofile_cpu_notifier);
}
int oprofile_timer_init(struct oprofile_operations *ops)
{
ops->create_files = NULL;
ops->setup = oprofile_hrtimer_setup;
ops->shutdown = oprofile_hrtimer_shutdown;
ops->start = oprofile_hrtimer_start;
ops->stop = oprofile_hrtimer_stop;
ops->cpu_type = "timer";
printk(KERN_INFO "oprofile: using timer interrupt.\n");
return 0;
}
/* 2013-01-14 YJChen: Add Begin */
extern unsigned int wmt_read_oscr(void);
static int timer_notify(struct pt_regs *regs)
{
oprofile_add_sample(regs, 0);
return 0;
}
static irqreturn_t
wmt_timer2_interrupt(int irq, void *dev_id)
{
unsigned int next_match;
int flag = 0;
do {
struct pt_regs *regs;
if (flag == 1)
printk(KERN_INFO "wmt_timer2_interrupt while\n");
flag = 1;
//struct pt_regs *regs = get_irq_regs(); // fix compile warning: ISO C90 forbids mixed declarations and code
regs = get_irq_regs();
timer_notify(regs);
/* Clear match on OS Timer 2 */
OSTS_VAL = OSTS_M2;
next_match = OSM2_VAL = wmt_read_oscr() + TIMER2_LATCH;
} while ((signed long)(next_match - wmt_read_oscr()) <= 10/*0*/);
return IRQ_HANDLED;
}
static int timer2_start(void)
{
unsigned int nCount;
unsigned int i = 0;
/* Use OS Timer 2 as oprofile timer. */
i = request_irq(IRQ_OST2, wmt_timer2_interrupt, IRQF_DISABLED, "timer2", NULL);
if (i != 0) {
printk(KERN_ERR "oprofile: unable to request IRQ%u for timer2\n", IRQ_OST2);
return i;
}
nCount = wmt_read_oscr();
//printk(KERN_INFO "%s Enter nCount=%d\n", __FUNCTION__, nCount);
/* Set initial match */
while (OSTA_VAL & OSTA_MWA2)
;
/* Disable match on timer 2 to cause interrupts. */
OSTI_VAL &= ~OSTI_E2;
OSM2_VAL = nCount + TIMER2_LATCH;
/* Enable match on timer 2 to cause interrupts. */
OSTI_VAL |= OSTI_E2;
/* Let OS Timer free run. */
if ((OSTC_VAL & OSTC_ENABLE) == 0)
OSTC_VAL |= OSTC_ENABLE;
return 0;
}
static void timer2_stop(void)
{
/* Disable match on timer 2 to cause interrupts. */
OSTI_VAL &= ~OSTI_E2;
/* Set initial match */
while (OSTA_VAL & OSTA_MWA2)
;
OSM2_VAL = 0;
free_irq(IRQ_OST2, NULL);
}
int __init oprofile_timer2_init(struct oprofile_operations *ops)
{
int rc;
rc = register_hotcpu_notifier(&oprofile_cpu_notifier);
if (rc)
return rc;
ops->create_files = NULL;
ops->setup = oprofile_hrtimer_setup;
ops->shutdown = oprofile_hrtimer_shutdown;
ops->start = timer2_start;
ops->stop = timer2_stop;
ops->cpu_type = "timer";
printk(KERN_INFO "oprofile: using timer2 interrupt.\n");
return 0;
}
/* 2013-01-14 YJChen: Add End */
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