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/*

 *  linux/arch/arm/mach-clps711x/time.c

 *

 *  Copyright (C) 2001 Deep Blue Solutions Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include <linux/sched.h>

#include <linux/init.h>

#include <asm/hardware.h>

#include <asm/io.h>

#include <asm/hardware/clps7111.h>

extern unsigned long (*gettimeoffset)(void);

/*

 * gettimeoffset() returns time since last timer tick, in usecs.

 *

 * 'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy.

 * 'tick' is usecs per jiffy.

 */

static unsigned long clps711x_gettimeoffset(void)

{

        unsigned long hwticks;

        hwticks = LATCH - (clps_readl(TC2D) & 0xffff);  /* since last underflow */

        return (hwticks * tick) / LATCH;

}

void __init clps711x_setup_timer(void)

{

        unsigned int syscon;

        gettimeoffset = clps711x_gettimeoffset;

        syscon = clps_readl(SYSCON1);

        syscon |= SYSCON1_TC2S | SYSCON1_TC2M;

        clps_writel(syscon, SYSCON1);

        clps_writel(LATCH-1, TC2D); /* 512kHz / 100Hz - 1 */

        xtime.tv_sec = clps_readl(RTCDR);

}