time.h
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上传日期:2013-04-10
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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