zynq linux驱动之PL-PS中断_zynq pl-ps中断驱动

PC：Windows 10

虚拟机：ubuntu 16.04

vivado：2017.04

PetaLinux：2017.04

开发板：黑金AX7010

根文件系统：debian8

-------------------------------------------------- --------------------传说中的分割线------------------------- -------------------------------------------------- ----

 将  zynq linux驱动之传统开发  里的vivado工程另存为interrupt7010

接下来配置一下中断

这里会出现中断的接口

接下来添加一个引脚

连起来

重新生成一下顶层文件

打开顶层文件，加一个非门（因为PS这边貌似只支持上升沿中断和高电平中断）

在约束文件里面添加触发IRQ的引脚（这里用的是KEY4，HDMI座子旁边的那个按键）

执行生成位文件

结束之后将原来的SDK目录删掉

重新导入硬件和位文件之后打开SDK

将该文件夹拷贝到Ubuntu的里

使用的PetaLinux编译fsbl，u-boot的，内核，设备树文件：

过程略.....

用的PetaLinux制作BOOT.BIN文件，将BOOT.BIN，image.ub，system.dtb文件拷贝到SD卡的fat分区里（这里没有用的PetaLinux生成的根文件系统，用的是debian8）

接下来打开datasheet

找到中断号是61

然后先到开板上看一下

cat /proc/interrupts

再看看datasheet上

没有问题,中断号都对得上

然后再回到ubuntu里看看设备树

vim components/plnx_workspace/device-tree/device-tree-generation/zynq-7000.dtsi

发现这里的中断号跟datasheet 和 /proc/interrupt 里面的对不上

仔细观察发现设备树里面的中断号是datasheet的中断号减去32得到的值

接下来仿照这个写一个自己的

vim project-spec/meta-user/recipes-bsp/device-tree/files/system-user.dtsi

/include/ "system-conf.dtsi"
/ {
        amba_pl: amba_pl{
                #address-cells = <1>;
                #size-cells = <1>;
                compatible = "simple-bus";
                ranges;
                irq: irq@0{
                        compatible = "hello,irq";
                        interrupt-parent = <&intc>;
                        interrupts = <0 29 2>;
                };
        };
};
 

执行的petaLinux-build编译

编译完成之后

到开发板上，挂接NFS文件系统，然后把编译好的设备树文件（system.dts）拷贝到开发板SD卡的fat分区里，重启开发板

ls /proc/device-tree/amba_pl/

可以看到设备树节点增加了IRQ @ 0

编写驱动：

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/of.h>
#include <linux/delay.h>
 
#include <linux/dma-mapping.h>
 
#include <linux/pm.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/dma-buf.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/dmaengine.h>
#include <linux/completion.h>
#include <linux/wait.h>
#include <linux/init.h>
 
#include <linux/sched.h>
#include <linux/pagemap.h>
#include <linux/errno.h>	/* error codes */
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
 
#include <linux/moduleparam.h>
#include <linux/miscdevice.h>
#include <linux/ioport.h>
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/pci.h>
 
#include <linux/time.h>
#include <linux/timer.h>
 
 
 
 
//
static char 			devname[16];
static int 				major;
static int             	mijor;
static struct class*	cls;
static void __iomem*	base_address;	
static resource_size_t  remap_size;  
static int	            irq;
static struct device*	dev;           
 
//
 
 
#define DEVICE_NAME "irq_drv"
 
 
static volatile int irq_is_open = 0;
 
static struct fasync_struct *irq_async;
 
 
static int irq_drv_open(struct inode *Inode, struct file *File)
{
	irq_is_open = 1;
	return 0;
}
 
 
int irq_drv_release (struct inode *inode, struct file *file)
{
	irq_is_open = 0;
	return 0;
}
 
 
 
static ssize_t irq_drv_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	return 0;
}
 
static ssize_t irq_drv_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
	return 0;
}
 
static int irq_drv_fasync (int fd, struct file *filp, int on)
{
	return fasync_helper (fd, filp, on, &irq_async);
}
 
 
static struct file_operations irq_fops = {	
	.owner  		= THIS_MODULE,
	.open 			= irq_drv_open,
	.read 			= irq_drv_read, 
	.write 			= irq_drv_write,
	.fasync		 	= irq_drv_fasync,
	.release		= irq_drv_release,
};
 
static irqreturn_t irq_interrupt(int irq, void *dev_id)
{
	printk("irq = %d\n", irq);
	if(irq_is_open)
	{
		kill_fasync (&irq_async, SIGIO, POLL_IN);
	}
	return IRQ_HANDLED;
}
 
static int irq_probe(struct platform_device *pdev)
{
	int					err;
	struct device *tmp_dev;
	memset(devname,0,16);
	strcpy(devname, DEVICE_NAME);
	
	major = register_chrdev(0, devname, &irq_fops);
 
	cls = class_create(THIS_MODULE, devname);
	mijor = 1;
	tmp_dev = device_create(cls, &pdev->dev, MKDEV(major, mijor), NULL, devname);
	if (IS_ERR(tmp_dev)) {
		class_destroy(cls);
		unregister_chrdev(major, devname);
		return 0;
	}
	
	
	irq = platform_get_irq(pdev,0);
	if (irq <= 0)
		return -ENXIO;
 
	dev = &pdev->dev;
 
	err = request_threaded_irq(irq, NULL,
				irq_interrupt,
				IRQF_TRIGGER_RISING | IRQF_ONESHOT,
				devname, NULL);				   
	if (err) {
		printk(KERN_ALERT "irq_probe irq	error=%d\n", err);
 
		goto fail;
	}
	else
	{
		printk("irq = %d\n", irq);
		printk("devname = %s\n", devname);
	}
 
 
	//保存dev
	//platform_set_drvdata(pdev, &xxx);	
 
 
 
	return 0;
 
fail:
	
	free_irq(irq, NULL);
 
	device_destroy(cls, MKDEV(major, mijor));	
	class_destroy(cls);
	unregister_chrdev(major, devname);
 
	return -ENOMEM;
 
}
 
static int irq_remove(struct platform_device *pdev)
{
	device_destroy(cls, MKDEV(major, mijor));	
	class_destroy(cls);
	unregister_chrdev(major, devname);
	
 
	free_irq(irq, NULL);
	printk("irq = %d\n", irq);
 
	return 0;
}
 
static int irq_suspend(struct device *dev)
{
 
	return 0;
}
 
static int irq_resume(struct device *dev)
{
 
	return 0;
}
 
static const struct dev_pm_ops irq_pm_ops = {
	.suspend = irq_suspend,
	.resume  = irq_resume,
};
 
 
//MODULE_DEVICE_TABLE(platform, irq_driver_ids);
 
static const struct of_device_id irq_of_match[] = {
	{.compatible = "hello,irq" },
	{ }
};
MODULE_DEVICE_TABLE(of, irq_of_match);
 
 
static struct platform_driver irq_driver = {
	.probe = irq_probe,
	.remove	= irq_remove,
	.driver = {
		.owner   		= THIS_MODULE,
		.name	 		= "irq@0",
		.pm    			= &irq_pm_ops,
		.of_match_table	= irq_of_match,		
	},
};
 
module_platform_driver(irq_driver);
 
 
MODULE_LICENSE("GPL v2");
 
 

Makefile文件：

export ARCH=arm
 
KERN_DIR = /home/zynq/work/kernel/linux-4.9
 
 
 
all:
        make -C $(KERN_DIR) M=`pwd` modules
 
 
 
clean:
        make -C $(KERN_DIR) M=`pwd` modules clean
        rm -rf modules.order
 
obj-m  += irq_drv.o
 
 

编译驱动

开发板挂接NFS文件系统，加载驱动

然后按一下按键，内核就能打印出IRQ

编写测试程序：

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <poll.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
 
 
int fd;
 
void my_signal_fun(int signum)
{
	printf("irq app printf!\n");
}
 
int main(int argc, char **argv)
{
	unsigned char key_val;
	int ret;
	int Oflags;
 
	signal(SIGIO, my_signal_fun);
	
	fd = open("/dev/irq_drv", O_RDWR);
	if (fd < 0)
	{
		printf("can't open!\n");
	}
 
	fcntl(fd, F_SETOWN, getpid());
	
	Oflags = fcntl(fd, F_GETFL); 
	
	fcntl(fd, F_SETFL, Oflags | FASYNC);
 
 
	while (1)
	{
		sleep(1000);
	}
	
	return 0;
}

编译

arm-linux-gnueabihf-gcc -o irq irq.c

回到开发板运行测试程序

按下按键之后能够看到内核和测试程序的打印信息

 

 

 

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