[PATCH] m68knommu: create common timer code for 68x328 processor varients

/***************************************************************************/

/*

 *  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/config.h>

#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;

}

/***************************************************************************/