mini6410 定时器中断驱动
io口利用GPE2和GPE4口
定时器用定时器1
-----------------------驱动程序分割线-----------------------
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <mach/hardware.h>
#include <plat/regs-timer.h>
#include <mach/regs-irq.h>
#include <asm/mach/time.h>
#include <linux/clk.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <plat/gpio-cfg.h>
#include <plat/regs-clock.h>
#include <plat/regs-gpio.h>
#include <plat/gpio-bank-e.h>
#include <linux/timer.h>
#include <linux/irq.h>
#define DEVICE_NAME "iopwm"
#define iopwm_irq IRQ_TIMER1
struct cdev *iopwm_cdev;
unsigned int counter=0;
unsigned int pwm[]={110,55};
unsigned long tmp;
static irqreturn_t iopwm_interrupt(int irq , void *dev_id)
{
if(irq !=IRQ_TIMER1){
printk("bad irq % d in timer0 \n", irq);
return -1;
}
// printk("good irq % d in timer0 \n", irq);
counter++;
if(counter ==pwm[0])
{
tmp = readl(S3C64XX_GPEDAT);
tmp |= (0x4);
writel(tmp, S3C64XX_GPEDAT);
}
if(counter ==pwm[1])
{
tmp = readl(S3C64XX_GPEDAT);
tmp |= (0x10);
writel(tmp, S3C64XX_GPEDAT);
}
if(counter ==600)
{
tmp = readl(S3C64XX_GPEDAT);
tmp &= ~(0x14);
writel(tmp, S3C64XX_GPEDAT);
counter=0;
}
return IRQ_RETVAL(IRQ_HANDLED);
}
void iopwm_timerinit(void)
{
unsigned long tcfg0,tcfg1,tcon,cstat;
struct clk *clk_p;
unsigned long pclk,tcnt;
unsigned long freq=20000;
{
unsigned temp;
temp = readl(S3C64XX_GPEPUD);
temp = (temp & ~(0x33U<<4))|(0x22U<<4); //设置GPE2 和GPE4口上拉
writel(temp, S3C64XX_GPEPUD);
temp = readl(S3C64XX_GPECON);
temp = (temp & ~(0x0f0fU<<8))|(0x0101U<<8); //设置GPE2 和GPE4口为输出
writel(temp, S3C64XX_GPECON);
temp = readl(S3C64XX_GPEDAT);
temp |= (0x14);
writel(temp, S3C64XX_GPEDAT);
}
tcon = __raw_readl(S3C_TCON);
tcfg1 = __raw_readl(S3C_TCFG1);
tcfg0 = __raw_readl(S3C_TCFG0);
//prescaler = 50
tcfg0 &= ~S3C_TCFG_PRESCALER0_MASK;
tcfg0 |= (50 - 1);
//mux = 1/16
tcfg1 &= ~S3C_TCFG1_MUX1_MASK;
tcfg1 |= S3C_TCFG1_MUX1_DIV4;
__raw_writel(tcfg1, S3C_TCFG1);
__raw_writel(tcfg0, S3C_TCFG0);
clk_p = clk_get(NULL, "pclk");
pclk = clk_get_rate(clk_p);
tcnt = (pclk/50/16)/freq;
printk("TCNT is %ld\n",tcnt);
__raw_writel(tcnt, S3C_TCNTB(1));
__raw_writel(0, S3C_TCMPB(1));
//定时器1中断使能
cstat = __raw_readl(S3C_TINT_CSTAT);
//cstat &=~S3C_TINT_CSTAT_T0INTEN;
cstat |=0x2;
__raw_writel(cstat,S3C_TINT_CSTAT);
tcon &= ~0xf1<<4;
tcon |= 0xb<<8; //disable deadzone, auto-reload, inv-off, update TCNTB0&TCMPB0, start timer 1
__raw_writel(tcon, S3C_TCON);
tcon &= ~0x2<<8; //clear manual update bit
__raw_writel(tcon, S3C_TCON);
printk("init iopwm success!\n");
}
static int iopwm_open(struct inode *inode,struct file *filp)
{
printk("Register iopwm success!\n");
return 0;
}
static int iopwm_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned int arg)
{
switch (cmd)
{
case 0:
pwm[0]=arg;
break;
case 1:
pwm[1]=arg;
break;
default:
return -EINVAL;
}
return 0;
}
static int iopwm_close(struct inode *inode,struct file *filp)
{
// free_irq(iopwm_irq,NULL);
return 0;
}
static struct file_operations iopwm_fops={
.owner=THIS_MODULE,
.open=iopwm_open,
.ioctl=iopwm_ioctl,
.release=iopwm_close,
};
static struct miscdevice misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &iopwm_fops,
};
static int __init iopwm_init(void)
{
int ret;
ret = misc_register(&misc);
printk (DEVICE_NAME"\tinitialized\n");
iopwm_timerinit();
ret=request_irq(iopwm_irq,iopwm_interrupt,IRQ_TYPE_LEVEL_HIGH, DEVICE_NAME, NULL);
if(ret<0){
printk("Register IOPWM failed!\n");
return ret;
}
printk("Register iopwm success!\n");
return ret;
}
static void __exit iopwm_exit(void)
{
free_irq(iopwm_irq,NULL);
misc_deregister(&misc);
}
module_init(iopwm_init);
module_exit(iopwm_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("gfpeak@gamil.com");
------------------------------------------------------------------应用程序分割线------------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
int main(int argc, char **argv)
{
int pwm;
int pwm_number;
int fd;
if (argc != 3 || sscanf(argv[1], "%d", &pwm_number) != 1 || sscanf(argv[2],"%d", &pwm) != 1)
{
fprintf(stderr, "input error\n");
exit(1);
}
fd = open("/dev/iopwm", 0);
if (fd < 0)
{
perror("open device /dev/iopwm");
exit(1);
}
ioctl(fd, led_number , pwm);
close(fd);
return 0;
}