虚拟地址linux驱动,2410并行接口驱动，虚拟地址和实际地址映射问题。

2410并行接口驱动&＃xff0c;虚拟地址和实际地址映射问题。

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使用S3C2410的DATA0~DATA15&＃xff0c;扩展2个并行接口&＃xff0c;原理图如下所示。

通过一个CPLD扩展I/O驱动修改成驱动程序&＃xff0c;编译没有出错&＃xff0c;但是在板子上insmod时出现段错误。

怀疑是使用的物理地址和虚拟地址不对。

#define pEXTERNAL_IO_Addr 0x080000c0

#define EXTERNAL_BaseAddr_IO (*(volatile unsigned char*)(0xd02000c0))

加载模块时出错信息&＃xff1a;

[root&＃64;(none) tmp]# insmod DIGIO2.ko

Using DIGIO2.ko

Unable to handle kernel paging request at virtual address 56000000

pgd &＃61; c2604000

[56000000] *pgd&＃61;00000000

Internal error: Oops: 5 [#1]

Modules linked in: DIGIO ov511 usbvideo usb_storage sd_mod

CPU: 0

PC is at digio_init&＃43;0x50/0xc0 [DIGIO]

LR is at 0x56000004

pc : []    lr : [<56000004>]    Not tainted

sp : c2e55f6c  ip : 56000000  fp : c2e55f84

r10: 00000000  r9 : c2e54000  r8 : c002c5c4

r7 : 00000000  r6 : 56000014  r5 : 56000010  r4 : 00000000

r3 : c0270284  r2 : 0000efff  r1 : 000007fe  r0 : bf03010c

Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  Segment user

Control: C000717F  Table: 32604000  DAC: 00000015

Process insmod (pid: 337, stack limit &＃61; 0xc2e54190)

Stack: (0xc2e55f6c to 0xc2e56000)

5f60:                            c026f44c bf030520 c026f434 c2e55fa4 c2e55f88

5f80: c0055fbc bf032010 00000004 00000000 00000000 00000080 00000000 c2e55fa8

5fa0: c002c440 c0055e20 00000000 00000000 00900080 40015000 00000b79 001cb028

5fc0: 00000004 00000000 00000000 befffd74 001cb018 001cb008 00000000 00000000

5fe0: beffd8c4 beffd8b8 000444e0 40199ac0 60000010 00900080 e586000c e596201c

Backtrace:

[] (digio_init&＃43;0x0/0xc0 [DIGIO]) from [] (sys_init_module&＃43;0)

r6 &＃61; C026F434  r5 &＃61; BF030520  r4 &＃61; C026F44C

[] (sys_init_module&＃43;0x0/0x314) from [] (ret_fast_syscall&＃43;0x)

r7 &＃61; 00000080  r6 &＃61; 00000000  r5 &＃61; 00000000  r4 &＃61; 00000004

Code: aa000002 eb403843 e1a00004 e91ba870 (e59c3000)

Segmentation fault

并行接口原理图.jpg (164.89 KB, 下载次数: 0)

并行接口原理图

2012-11-29 14:57 上传

并行接口原理图

附上驱动程序代码&＃xff1a;

#ifndef __KERNEL__

#define __KERNEL__

#endif

#ifndef MODULE

#define MODULE

#endif

#include//包含可装载模块需要的大量符号和函数的定义

#include#include//定义了LINUX内核的版本&＃xff0c;用于版本检查

#include#include//指定初始化和清除函数

#include//#include

//

//#include//LINUX内核编译时的配置文件&＃xff0c;文件里面指向另一个由make menuconfig自动生成的文件autoconfig.h

#include#include//最重要的头文件之一。该文件包含驱动程序使用的大部分内核API的定义&＃xff0c;包含睡眠函数以及各种变量声明。

#include#include#include#include//#include#include#include//

#define DEVICE_NAME "digio" //设备名

#define DIGIO_MAJOR 232   //主设备号

//unsigned short buffer,dio_value;

#define pEXTERNAL_IO_Addr 0x080000c0

#define EXTERNAL_BaseAddr_IO (*(volatile unsigned char*)(0xd02000c0))

/*

static void dig_io_read()

{

(void *)(digital_in)&＃61;ioremap(0x0800b800,0x2);   //映射74HC574,16位

buffer&＃61;*(volatile unsigned short *)(digital_in); //读数字输入

copy_to_user(buffer,&dio_value,sizeof(dio_value));//数据送入用户空间

}

static void dig_io_write()

{

(void *)(digital_out)&＃61;ioremap(0x10000000,0x2);   //映射74HC574,16位

copy_form_user(&dio_value,buffer,sizeof(dio_value));//数据送入内核空间

*(volatile unsigned short *)&＃61;buffer;        //写数字输出

}

*/

static ssize_t dig_io_read(struct file *filp,char *buf,size_t count,loff_t *f_pos) //读函数

{

unsigned char val;

val&＃61;inb(EXTERNAL_BaseAddr_IO); //读取数据

copy_to_user(buf,&val,1); //数据送入用户空间

return 1;

}

static ssize_t dig_io_write(struct file *filp,const char *buf,size_t count,loff_t *f_pos)

{

unsigned char val;

copy_from_user(&val,buf,1); //数据送入内核空间

outb(val,EXTERNAL_BaseAddr_IO); //写数据

return 1;

}

static struct file_operations digio_fops&＃61;{

owner:THIS_MODULE,

write:dig_io_write,

read:dig_io_read,

};

//static devfs_handle_t devfs_handle;

/*

static int digio_ioctl(struct inode * inode,struct file * file,unsigned int cmd,unsigned long arg)

{

switch(cmd)

{

case 0:dig_io_read();

case 1:dig_io_write();

default:

return -EINVAL;

}

}

static struct file_operations digio_fops&＃61;{

owner:THIS_MODULE,

ioctl:digio_ioctl,

};

*/

static int __init digio_init(void) //设备驱动初始化函数

{

int ret;

int i;

ret&＃61;register_chrdev(DIGIO_MAJOR,DEVICE_NAME,&digio_fops);

if(ret<0)

{

printk(DEVICE_NAME"can&＃39;t regsiter major number");

return ret;

}

// devfs_handle&＃61;devfs_register(NULL,DEVICE_NAME,DEVFS_FL_DEFAULT,DIGIO_MAJOR,S_IFCHR|S_IRUSR|S_IWUSR,&digio_fops,NULL);

// EXTERNAL_BaseAddr_IO&＃61;ioremap(pEXTERNAL_IO_Addr,1);

rGPACON&＃61;rGPACON&0x7effff;

rGPADAT&＃61;rGPADAT&0xefff;

rGPBCON&＃61;rGPBCON&0x3ffffc|0x000001;

rGPBDAT&＃61;rGPBDAT&0x7fe;

printk(DEVICE_NAME"initialized\n");

return 0;

}

static void __exit digio_exit(void) //模块退出函数

{

// iounmap(EXTERNAL_BaseAddr_IO);

// devfs_unregister(devfs_handle);

unregister_chrdev(DIGIO_MAJOR,DEVICE_NAME);

}

module_init(digio_init);

module_exit(digio_exit);

MODULE_LICENSE("GPL");