zynq linux驱动之PL-PS中断【转】

时间：2021-07-20 12:34:39

转自：https://blog.csdn.net/h244259402/article/details/83993524

PC：Windows 10

虚拟机：ubuntu 16.04

vivado：2017.04

的的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卡的胖分区里（这里没有用的PetaLinux生成的根文件系统，用的是debian8）

接下来打开数据表

找到中断号是61

然后先到开板上看一下

cat /proc/interrupts

再看看数据表上

没有问题中断号都对得上

然后再来看看设备树

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

发现这里的中断号跟数据表和/ PROC /中断里面的对不上

仔细观察发现设备树里面的中断号是数据表上的中断号减去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建造编译

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卡的脂肪分区里，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
---------------------
作者：h244259402
来源：CSDN
原文：https://blog.csdn.net/h244259402/article/details/83993524
版权声明：本文为博主原创文章，转载请附上博文链接！

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