text: /*
   * arch/arm/mach-l7200/include/mach/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 <mach/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 irqreturn_t
  timer_interrupt(int irq, void *dev_id)
  {
  	struct pt_regs *regs = get_irq_regs();
  	do_timer(1);
  #ifndef CONFIG_SMP
  	update_process_times(user_mode(regs));
  #endif
  	do_profile(regs);
  	RTC_RTCC = 0;				/* Clear interrupt */
  
  	return IRQ_HANDLED;
  }
  
  /*
   * Set up RTC timer interrupt, and return the current time in seconds.
   */
  void __init time_init(void)
  {
  	RTC_RTCC = 0;				/* Clear interrupt */
  
  	timer_irq.handler = timer_interrupt;
  
  	setup_irq(IRQ_RTC_TICK, &timer_irq);
  
  	RTC_RTCCR = RTC_RATE_128 | RTC_EN_TIC;	/* Set rate and enable timer */
  }
  
  #endif
  