?? time.h
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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 <linux/config.h>#include <asm/leds.h>#define IRQ_TIMER IRQ_EBSA110_TIMER0#define MCLK_47_8#if defined(MCLK_42_3)#define PIT1_COUNT 0xecbe#elif defined(MCLK_47_8)/* * This should be 0x10AE1, 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 0x8570#define DIVISOR 2#endif extern __inline__ unsigned long gettimeoffset (void){ return 0;}static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs){ *PIT_T1 = (PIT1_COUNT) & 0xff; *PIT_T1 = (PIT1_COUNT) >> 8;#ifdef CONFIG_LEDS { static int count = 50; if (--count == 0) { count = 50; leds_event(led_timer); } }#endif {#ifdef DIVISOR static unsigned int divisor; if (divisor-- == 0) { divisor = DIVISOR - 1;#else {#endif do_timer(regs); } }}static struct irqaction timerirq = { timer_interrupt, 0, 0, "timer", NULL, NULL};/* * Set up timer interrupt, and return the current time in seconds. */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; /* * Default the date to 1 Jan 1970 0:0:0 * You will have to run a time daemon to set the * clock correctly at bootup */ xtime.tv_sec = mktime(1970, 1, 1, 0, 0, 0); setup_arm_irq(IRQ_TIMER, &timerirq);}
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