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/*
* Copyright 1996 The Australian National University.
* Copyright 1996 Fujitsu Laboratories Limited
*
* This software may be distributed under the terms of the Gnu
* Public License version 2 or later
*/
/* routines to control the AP1000 timer chip */
#include <linux/time.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/malloc.h>
#include <asm/ap1000/apservice.h>
#include <asm/ap1000/apreg.h>
#include <asm/irq.h>
#define INIT_TIM1 (781250/HZ)
#define INIT_TIM0 (781250/(10*HZ))
static unsigned long last_freerun;
unsigned ap_freerun(void)
{
return *((volatile unsigned long *)(MC_FREERUN + 4));
}
void ap_clear_clock_irq(void)
{
MC_OUT(MC_INTR, AP_CLR_INTR_REQ << MC_INTR_ITIM1_SH);
last_freerun = *((unsigned long *)(MC_FREERUN + 4));
tnet_check_completion();
#if 1
if ((((unsigned)jiffies) % (HZ/4)) == 0) {
msc_timer();
ap_xor_led(1);
bif_timer();
ap_dbg_flush();
#if 0
bif_led_status();
#endif
}
#endif
}
void ap_gettimeofday(struct timeval *xt)
{
unsigned long d;
unsigned v;
unsigned long new_freerun;
/* this is in 80ns units - we only use the low 32 bits
as 5mins is plenty for this stuff */
d = new_freerun = *((unsigned long *)(MC_FREERUN + 4));
if (d < last_freerun) {
/* wraparound */
d += ((~0) - last_freerun);
} else {
d -= last_freerun;
}
/* convert to microseconds */
v = ((d&0xffffff)*10)/125;
/* only want microseconds/HZ */
v = v%(1000000/HZ);
xt->tv_usec += v;
last_freerun = new_freerun;
}
static void profile_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
if (prof_buffer && current->pid) {
extern int _stext;
unsigned long ip = instruction_pointer(regs);
ip -= (unsigned long) &_stext;
ip >>= prof_shift;
if (ip < prof_len)
prof_buffer[ip]++;
}
MC_OUT(MC_INTR,AP_CLR_INTR_REQ << MC_INTR_ITIM0_SH);
}
void ap_profile_init(void)
{
if (prof_shift) {
printk("Initialising profiling with prof_shift=%d\n",(int)prof_shift);
MC_OUT(MC_INTR,AP_CLR_INTR_REQ << MC_INTR_ITIM0_SH);
MC_OUT(MC_INTR,AP_CLR_INTR_MASK << MC_INTR_ITIM0_SH);
}
}
void ap_init_timers(void)
{
extern void timer_interrupt(int irq, void *dev_id, struct pt_regs * regs);
unsigned flags;
printk("Initialising ap1000 timer\n");
save_flags(flags); cli();
request_irq(APTIM1_IRQ,
timer_interrupt,
(SA_INTERRUPT | SA_STATIC_ALLOC),
"timer", NULL);
request_irq(APTIM0_IRQ,
profile_interrupt,
(SA_INTERRUPT | SA_STATIC_ALLOC),
"profile", NULL);
ap_clear_clock_irq();
MC_OUT(MC_ITIMER0,INIT_TIM0);
MC_OUT(MC_ITIMER1,INIT_TIM1);
MC_OUT(MC_INTR,AP_CLR_INTR_REQ << MC_INTR_ITIM1_SH);
MC_OUT(MC_INTR,AP_CLR_INTR_MASK << MC_INTR_ITIM1_SH);
MC_OUT(MC_INTR,AP_SET_INTR_MASK << MC_INTR_ITIM0_SH);
restore_flags(flags);
}
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