106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
|
/***************************************************************************/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 <asm/setup.h>
|
||
|
|
#include <asm/system.h>
|
||
|
|
#include <asm/pgtable.h>
|
||
|
|
#include <asm/irq.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
|
||
|
|
|
||
|
|
/***************************************************************************/
|
||
|
|
|
||
|
|
void m68328_timer_init(irqreturn_t (*timer_routine) (int, void *, struct pt_regs *))
|
||
|
|
{
|
||
|
|
/* disable timer 1 */
|
||
|
|
TCTL = 0;
|
||
|
|
|
||
|
|
/* set ISR */
|
||
|
|
if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL))
|
||
|
|
panic("Unable to attach timer interrupt\n");
|
||
|
|
|
||
|
|
/* 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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/***************************************************************************/
|
||
|
|
|
||
|
|
void m68328_timer_tick(void)
|
||
|
|
{
|
||
|
|
/* Reset Timer1 */
|
||
|
|
TSTAT &= 0;
|
||
|
|
}
|
||
|
|
/***************************************************************************/
|
||
|
|
|
||
|
|
unsigned long m68328_timer_gettimeoffset(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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/***************************************************************************/
|