74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/*
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* linux/include/asm-arm/arch-l7200/time.h
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*
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* Copyright (C) 2000 Rob Scott (rscott@mtrob.fdns.net)
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* Steve Hill (sjhill@cotw.com)
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*
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* Changelog:
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* 01-02-2000 RS Created l7200 version, derived from rpc code
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* 05-03-2000 SJH Complete rewrite
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*/
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#ifndef _ASM_ARCH_TIME_H
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#define _ASM_ARCH_TIME_H
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#include <asm/arch/irqs.h>
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/*
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* RTC base register address
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*/
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#define RTC_BASE (IO_BASE_2 + 0x2000)
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/*
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* RTC registers
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*/
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#define RTC_RTCDR (*(volatile unsigned char *) (RTC_BASE + 0x000))
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#define RTC_RTCMR (*(volatile unsigned char *) (RTC_BASE + 0x004))
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#define RTC_RTCS (*(volatile unsigned char *) (RTC_BASE + 0x008))
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#define RTC_RTCC (*(volatile unsigned char *) (RTC_BASE + 0x008))
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#define RTC_RTCDV (*(volatile unsigned char *) (RTC_BASE + 0x00c))
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#define RTC_RTCCR (*(volatile unsigned char *) (RTC_BASE + 0x010))
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/*
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* RTCCR register values
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*/
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#define RTC_RATE_32 0x00 /* 32 Hz tick */
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#define RTC_RATE_64 0x10 /* 64 Hz tick */
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#define RTC_RATE_128 0x20 /* 128 Hz tick */
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#define RTC_RATE_256 0x30 /* 256 Hz tick */
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#define RTC_EN_ALARM 0x01 /* Enable alarm */
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#define RTC_EN_TIC 0x04 /* Enable counter */
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#define RTC_EN_STWDOG 0x08 /* Enable watchdog */
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/*
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* Handler for RTC timer interrupt
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*/
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static irqreturn_t
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timer_interrupt(int irq, void *dev_id)
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{
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struct pt_regs *regs = get_irq_regs();
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do_timer(1);
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#ifndef CONFIG_SMP
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update_process_times(user_mode(regs));
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#endif
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do_profile(regs);
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RTC_RTCC = 0; /* Clear interrupt */
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return IRQ_HANDLED;
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}
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/*
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* Set up RTC timer interrupt, and return the current time in seconds.
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*/
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void __init time_init(void)
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{
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RTC_RTCC = 0; /* Clear interrupt */
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timer_irq.handler = timer_interrupt;
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setup_irq(IRQ_RTC_TICK, &timer_irq);
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RTC_RTCCR = RTC_RATE_128 | RTC_EN_TIC; /* Set rate and enable timer */
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}
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#endif
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