Commit c697ffba authored by Greg Ungerer's avatar Greg Ungerer Committed by Christoph Hellwig

[PATCH] create common timer code for m68knommu/ColdFire processors

This patch creates common timer setup and handling code for the m68knommu
ColdFire CPU sub-architecture. All 6 ColdFire CPU varients contain the
same hardware timers. Currently each sub-arch has its own timer code.
This reduces a lot of code duplication.
parent 04091338
/***************************************************************************/
/*
* linux/arch/m68knommu/platform/5307/timers.c
*
* Copyright (C) 1999-2003, Greg Ungerer (gerg@snapgear.com)
*/
/***************************************************************************/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/param.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/coldfire.h>
#include <asm/mcftimer.h>
#include <asm/mcfsim.h>
/***************************************************************************/
/*
* Default the timer and vector to use for ColdFire. Some ColdFire
* CPU's and some boards may want different. Their sub-architecture
* startup code (in config.c) can change these if they want.
*/
unsigned int mcf_timervector = 29;
unsigned int mcf_profilevector = 31;
unsigned int mcf_timerlevel = 5;
static volatile struct mcftimer *mcf_timerp;
/***************************************************************************/
void coldfire_tick(void)
{
/* Reset the ColdFire timer */
mcf_timerp->ter = MCFTIMER_TER_CAP | MCFTIMER_TER_REF;
}
void coldfire_timer_init(void (*handler)(int, void *, struct pt_regs *))
{
/* Set up an internal TIMER as poll clock */
mcf_timerp = (volatile struct mcftimer *) (MCF_MBAR + MCFTIMER_BASE1);
mcf_timerp->tmr = MCFTIMER_TMR_DISABLE;
mcf_timerp->trr = (unsigned short) ((MCF_BUSCLK / 16) / HZ);
mcf_timerp->tmr = MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE;
request_irq(mcf_timervector, handler, SA_INTERRUPT, "timer", NULL);
mcf_settimericr(1, mcf_timerlevel);
#ifdef CONFIG_HIGHPROFILE
coldfire_profile_init();
#endif
}
/***************************************************************************/
unsigned long coldfire_timer_offset(void)
{
unsigned long trr, tcn;
/* Get the values as longs for accurate calculation. */
tcn = mcf_timerp->tcn;
trr = mcf_timerp->trr;
return((tcn * (1000000 / HZ)) / trr);
}
/***************************************************************************/
#ifdef CONFIG_HIGHPROFILE
/***************************************************************************/
/*
* Choose a reasonably fast profile timer. Make it an odd value to
* try and get good coverage of kernal operations.
*/
#define PROFILEHZ 1013
static volatile struct mcftimer *mcf_proftp;
/*
* Use the other timer to provide high accuracy profiling info.
*/
void coldfire_profile_tick(int irq, void *dummy, struct pt_regs *regs)
{
/* Reset ColdFire timer2 */
mcf_proftp->ter = MCFTIMER_TER_CAP | MCFTIMER_TER_REF;
if (!user_mode(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]++;
}
}
}
void coldfire_profile_init(void)
{
printk("PROFILE: lodging TIMER2 @ %dHz as profile timer\n", PROFILEHZ);
/* Set up TIMER 2 as high speed profile clock */
mcf_proftp = (volatile struct mcftimer *) (MCF_MBAR + MCFTIMER_BASE2);
mcf_proftp->tmr = MCFTIMER_TMR_DISABLE;
mcf_proftp->trr = (unsigned short) ((MCF_CLK / 16) / PROFILEHZ);
mcf_proftp->tmr = MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE;
request_irq(mcf_profilevector, coldfire_profile_tick,
(SA_INTERRUPT | IRQ_FLG_FAST), "profile timer", NULL);
mcf_settimericr(2, 7);
}
/***************************************************************************/
#endif /* CONFIG_HIGHPROFILE */
/***************************************************************************/
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