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/***************************************************************************/
/*
* linux/arch/m68knommu/platform/68328/timers.c
*
* Copyright (C) 1993 Hamish Macdonald
* Copyright (C) 1999 D. Jeff Dionne
* Copyright (C) 2001 Georges Menie, Ken Desmet
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
/***************************************************************************/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/machdep.h>
#include <asm/MC68VZ328.h>
/***************************************************************************/
#if defined(CONFIG_DRAGEN2)
/* with a 33.16 MHz clock, this will give usec resolution to the time functions */
#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
#define CLOCK_PRE 7
#define TICKS_PER_JIFFY 41450
#elif defined(CONFIG_XCOPILOT_BUGS)
/*
* The only thing I know is that CLK32 is not available on Xcopilot
* I have little idea about what frequency SYSCLK has on Xcopilot.
* The values for prescaler and compare registers were simply
* taken from the original source
*/
#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
#define CLOCK_PRE 2
#define TICKS_PER_JIFFY 0xd7e4
#else
/* default to using the 32Khz clock */
#define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ
#define CLOCK_PRE 31
#define TICKS_PER_JIFFY 10
#endif
/***************************************************************************/
static irqreturn_t hw_tick(int irq, void *dummy)
{
/* Reset Timer1 */
TSTAT &= 0;
return arch_timer_interrupt(irq, dummy);
}
/***************************************************************************/
static struct irqaction m68328_timer_irq = {
.name = "timer",
.flags = IRQF_DISABLED | IRQF_TIMER,
.handler = hw_tick,
};
void hw_timer_init(void)
{
/* disable timer 1 */
TCTL = 0;
/* set ISR */
setup_irq(TMR_IRQ_NUM, &m68328_timer_irq);
/* Restart mode, Enable int, Set clock source */
TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
TPRER = CLOCK_PRE;
TCMP = TICKS_PER_JIFFY;
/* Enable timer 1 */
TCTL |= TCTL_TEN;
}
/***************************************************************************/
unsigned long hw_timer_offset(void)
{
unsigned long ticks = TCN, offset = 0;
/* check for pending interrupt */
if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM)))
offset = 1000000 / HZ;
ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY;
return ticks + offset;
}
/***************************************************************************/
void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
{
long now = RTCTIME;
*year = *mon = *day = 1;
*hour = (now >> 24) % 24;
*min = (now >> 16) % 60;
*sec = now % 60;
}
/***************************************************************************/
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