mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-03 09:37:03 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
139 lines
4.1 KiB
C
139 lines
4.1 KiB
C
/***************************************************************************/
|
|
|
|
/*
|
|
* timers.c -- generic ColdFire hardware timer support.
|
|
*
|
|
* 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;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/***************************************************************************/
|
|
|
|
void coldfire_tick(void)
|
|
{
|
|
/* Reset the ColdFire timer */
|
|
mcf_timerp->ter = MCFTIMER_TER_CAP | MCFTIMER_TER_REF;
|
|
}
|
|
|
|
/***************************************************************************/
|
|
|
|
void coldfire_timer_init(irqreturn_t (*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, offset;
|
|
|
|
/*
|
|
* The change to pointer and de-reference is to force the compiler
|
|
* to read the registers with a single 16bit access. Otherwise it
|
|
* does some crazy 8bit read combining.
|
|
*/
|
|
tcn = *(&mcf_timerp->tcn);
|
|
trr = *(&mcf_timerp->trr);
|
|
offset = (tcn * (1000000 / HZ)) / trr;
|
|
|
|
/* 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
|
|
/***************************************************************************/
|
|
|
|
/*
|
|
* 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 (current->pid)
|
|
profile_tick(CPU_PROFILING, regs);
|
|
}
|
|
|
|
/***************************************************************************/
|
|
|
|
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 */
|
|
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 */
|
|
/***************************************************************************/
|