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/***************************************************************************/
/*
* timers.c -- generic ColdFire hardware timer support.
*
* Copyright (C) 1999-2007, Greg Ungerer (gerg@snapgear.com)
*/
/***************************************************************************/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/coldfire.h>
#include <asm/mcftimer.h>
#include <asm/mcfsim.h>
/***************************************************************************/
/*
* By default use timer1 as the system clock timer.
*/
#define TA(a) (MCF_MBAR + MCFTIMER_BASE1 + (a))
/*
* 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;
/*
* These provide the underlying interrupt vector support.
* Unfortunately it is a little different on each ColdFire.
*/
extern void mcf_settimericr(int timer, int level);
extern int mcf_timerirqpending(int timer);
#if defined(CONFIG_M532x)
#define __raw_readtrr __raw_readl
#define __raw_writetrr __raw_writel
#else
#define __raw_readtrr __raw_readw
#define __raw_writetrr __raw_writew
#endif
/***************************************************************************/
static irqreturn_t hw_tick(int irq, void *dummy)
{
/* Reset the ColdFire timer */
__raw_writeb(MCFTIMER_TER_CAP | MCFTIMER_TER_REF, TA(MCFTIMER_TER));
return arch_timer_interrupt(irq, dummy);
}
/***************************************************************************/
static struct irqaction coldfire_timer_irq = {
.name = "timer",
.flags = IRQF_DISABLED | IRQF_TIMER,
.handler = hw_tick,
};
/***************************************************************************/
static int ticks_per_intr;
void hw_timer_init(void)
{
setup_irq(mcf_timervector, &coldfire_timer_irq);
__raw_writew(MCFTIMER_TMR_DISABLE, TA(MCFTIMER_TMR));
ticks_per_intr = (MCF_BUSCLK / 16) / HZ;
__raw_writetrr(ticks_per_intr - 1, TA(MCFTIMER_TRR));
__raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, TA(MCFTIMER_TMR));
mcf_settimericr(1, mcf_timerlevel);
#ifdef CONFIG_HIGHPROFILE
coldfire_profile_init();
#endif
}
/***************************************************************************/
unsigned long hw_timer_offset(void)
{
unsigned long tcn, offset;
tcn = __raw_readw(TA(MCFTIMER_TCN));
offset = ((tcn + 1) * (1000000 / HZ)) / ticks_per_intr;
/* Check if we just wrapped the counters and maybe missed a tick */
if ((offset < (1000000 / HZ / 2)) && mcf_timerirqpending(1))
offset += 1000000 / HZ;
return offset;
}
/***************************************************************************/
#ifdef CONFIG_HIGHPROFILE
/***************************************************************************/
/*
* By default use timer2 as the profiler clock timer.
*/
#define PA(a) (MCF_MBAR + MCFTIMER_BASE2 + (a))
/*
* Choose a reasonably fast profile timer. Make it an odd value to
* try and get good coverage of kernel operations.
*/
#define PROFILEHZ 1013
/*
* Use the other timer to provide high accuracy profiling info.
*/
irqreturn_t coldfire_profile_tick(int irq, void *dummy)
{
/* Reset ColdFire timer2 */
__raw_writeb(MCFTIMER_TER_CAP | MCFTIMER_TER_REF, PA(MCFTIMER_TER));
if (current->pid)
profile_tick(CPU_PROFILING, regs);
return IRQ_HANDLED;
}
/***************************************************************************/
void coldfire_profile_init(void)
{
printk(KERN_INFO "PROFILE: lodging TIMER2 @ %dHz as profile timer\n", PROFILEHZ);
/* Set up TIMER 2 as high speed profile clock */
__raw_writew(MCFTIMER_TMR_DISABLE, PA(MCFTIMER_TMR));
__raw_writetrr(((MCF_CLK / 16) / PROFILEHZ), PA(MCFTIMER_TRR));
__raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, PA(MCFTIMER_TMR));
request_irq(mcf_profilevector, coldfire_profile_tick,
(IRQF_DISABLED | IRQ_FLG_FAST), "profile timer", NULL);
mcf_settimericr(2, 7);
}
/***************************************************************************/
#endif /* CONFIG_HIGHPROFILE */
/***************************************************************************/
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