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/*

 * linux/include/asm-arm/arch-l7200/time.h

 *

 * Copyright (C) 2000 Rob Scott (rscott@mtrob.fdns.net)

 *                    Steve Hill (sjhill@cotw.com)

 *

 * Changelog:

 *   01-02-2000 RS      Created l7200 version, derived from rpc code

 *   05-03-2000 SJH     Complete rewrite

 */

#ifndef _ASM_ARCH_TIME_H

#define _ASM_ARCH_TIME_H

#include <asm/arch/irqs.h>

/*

 * RTC base register address

 */

#define RTC_BASE        (IO_BASE_2 + 0x2000)

/*

 * RTC registers

 */

#define RTC_RTCDR       (*(volatile unsigned char *) (RTC_BASE + 0x000))

#define RTC_RTCMR       (*(volatile unsigned char *) (RTC_BASE + 0x004))

#define RTC_RTCS        (*(volatile unsigned char *) (RTC_BASE + 0x008))

#define RTC_RTCC        (*(volatile unsigned char *) (RTC_BASE + 0x008))

#define RTC_RTCDV       (*(volatile unsigned char *) (RTC_BASE + 0x00c))

#define RTC_RTCCR       (*(volatile unsigned char *) (RTC_BASE + 0x010))

/*

 * RTCCR register values

 */

#define RTC_RATE_32     0x00      /* 32 Hz tick */

#define RTC_RATE_64     0x10      /* 64 Hz tick */

#define RTC_RATE_128    0x20      /* 128 Hz tick */

#define RTC_RATE_256    0x30      /* 256 Hz tick */

#define RTC_EN_ALARM    0x01      /* Enable alarm */

#define RTC_EN_TIC      0x04      /* Enable counter */

#define RTC_EN_STWDOG   0x08      /* Enable watchdog */

/*

 * Handler for RTC timer interrupt

 */

static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)

{

        do_timer(regs);

        do_profile(regs);

        RTC_RTCC = 0;                            /* Clear interrupt */

}

/*

 * Set up RTC timer interrupt, and return the current time in seconds.

 */

static inline void setup_timer(void)

{

        RTC_RTCC = 0;                            /* Clear interrupt */

        timer_irq.handler = timer_interrupt;

        setup_arm_irq(IRQ_RTC_TICK, &timer_irq);

        RTC_RTCCR = RTC_RATE_128 | RTC_EN_TIC;  /* Set rate and enable timer */

}

#endif