原创 linux加载定时器中断模块

/*转：http://www.arm9home.net/read.php?tid-3113-keyword-%B6%A8%CA%B1%C6%F7.html
*/
#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/fs.h>

#include <linux/init.h>

#include <linux/miscdevice.h>

#include <linux/delay.h>

#include <asm/irq.h>

#include <mach/hardware.h>

#include <linux/cdev.h>

#include <linux/mm.h>

#include <linux/interrupt.h>

#include <linux/poll.h>

#include <asm/uaccess.h>

#include <asm/ioctl.h>

#include <mach/regs-gpio.h>

#include <mach/regs-irq.h>

 
#include <plat/regs-timer.h>

#include <asm/io.h>

 
#include <linux/irq.h>

 
#include <linux/platform_device.h>

#define DEVICE_NAME "timer"

 
struct cdev *p_cdev; //éù?÷ò??????ò×?·?éè±??á11ì?μ?????

#define timer_irq IRQ_TIMER0

//#define DEVICE_MAJOR major

//#define DEVICE_MINOR 0  //??éè±?o?ò?°??a0

 
static irqreturn_t timer_interrupt(void)

{

    printk("Timer0 interrupt occured!\n");

    return IRQ_HANDLED;

}

 
static int timer_open(struct inode *inode,struct file *filp)

{

    int ret;

    unsigned long Ftclk,Fpclk=50000000; //s3c2440a+--?+Fpclk+?0MHz

    unsigned int tcfg0,tcfg1,tcon;

 
    tcfg0 = inl(S3C2410_TCFG0);

    tcfg1 = inl(S3C2410_TCFG1);

    tcon = inl(S3C2410_TCON);

 
    outl((tcfg0 &= ~0xff) | 255,S3C2410_TCFG0); //+?++?+++

    outl((tcfg1 &= ~0xf) | 3,S3C2410_TCFG1);   //+?+++++|--?+

    Ftclk=Fpclk/(255+1)/16;  //?++datasheet+?+

    outl(Ftclk,S3C2410_TCNTB(0));  //+++??±|?+

    outl(0,S3C2410_TCMPB(0));  //+++?++?±+++++

 
    outl(tcon | S3C2410_TCON_T0MANUALUPD,S3C2410_TCON); //+++??+++++￡?+?????TCNT|-TCMP

    tcon = inl(S3C2410_TCON) & ~S3C2410_TCON_T0MANUALUPD;

    outl(tcon | (S3C2410_TCON_T0START|S3C2410_TCON_T0RELOAD),S3C2410_TCON);   //+?++++??+|?+￡?+?++++?

 
    ret=request_irq(timer_irq,&timer_interrupt, IRQF_DISABLED, DEVICE_NAME,NULL);

    if(ret<0){

        printk("Register IRQ_TIMER0 failed!\n");

        return ret;

    }

 
}

 
static int timer_close(struct inode *inode,struct file *filp)

{

    free_irq(timer_irq,NULL);

    return 0;

}

 
static struct file_operations timer_fops={

    .owner=THIS_MODULE,

    .open=timer_open,

    .release=timer_close,

};

 
 
 
static struct miscdevice misc = {

    .minor = MISC_DYNAMIC_MINOR,

    .name = DEVICE_NAME,

    .fops = &timer_fops,

};

 
static int __init dev_init(void)

{

    int ret;

 
    ret = misc_register(&misc);

 
    printk (DEVICE_NAME"\tinitialized\n");

 
    return ret;

}

 
static void __exit dev_exit(void)

{

    misc_deregister(&misc);

}

 
MODULE_LICENSE("GPL");

MODULE_AUTHOR("HJW");

module_init(dev_init);

module_exit(dev_exit);


//测试程序
//2aê?3ìDòè???￡o

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/ioctl.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <sys/select.h>

#include <sys/time.h>

#include <errno.h>

 
int main(int argc, char **argv)

{

    int fd;

    fd=open("/dev/timer",0);

    if(fd<0){

        printf("Open /dev/timer failed!\n");

        exit(1);

    }

    else printf("Open device successfully!\n");

    while(1);

    close(fd);

    return 0;

}