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/*
* linux/include/asm-arm/arch-ebsa110/time.h
*
* Copyright (c) 1996,1997,1998 Russell King.
*
* No real time clock on the evalulation board!
*
* Changelog:
* 10-Oct-1996 RMK Created
* 04-Dec-1997 RMK Updated for new arch/arm/kernel/time.c
* 07-Aug-1998 RMK Updated for arch/arm/kernel/leds.c
* 28-Dec-1998 APH Made leds code optional
*/
#include <asm/leds.h>
#define MCLK_47_8
#if defined(MCLK_42_3)
#define PIT1_COUNT 0xecbe
#elif defined(MCLK_47_8)
/*
* This should be 0x10B43, but that doesn't exactly fit.
* We run the timer interrupt at 5ms, and then divide it by
* two in software... This is so that the user processes
* see exactly the same model whichever ARM processor they're
* running on.
*/
#define PIT1_COUNT 0x85A1
#define DIVISOR 2
#endif
static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
*PIT_T1 = (PIT1_COUNT) & 0xff;
*PIT_T1 = (PIT1_COUNT) >> 8;
#ifdef DIVISOR
{
static unsigned int divisor;
if (divisor--)
return;
divisor = DIVISOR - 1;
}
#endif
do_leds();
do_timer(regs);
}
/*
* Set up timer interrupt.
*/
extern __inline__ void setup_timer(void)
{
/*
* Timer 1, mode 0, 16-bit, autoreload
*/
*PIT_CTRL = 0x70;
/*
* Refresh counter clocked at 47.8MHz/7 = 146.4ns
* We want centi-second interrupts
*/
*PIT_T1 = (PIT1_COUNT) & 0xff;
*PIT_T1 = (PIT1_COUNT) >> 8;
timer_irq.handler = timer_interrupt;
setup_arm_irq(IRQ_EBSA110_TIMER0, &timer_irq);
}
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