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beaglebone black的GPIO的寄存器驱动

2014-12-30 分类：Sitara™ Cortex-A8 和 ARM9 微处理器 阅读(244)

beaglebone black使用的是Angstrom系统，现使用下面的驱动控制GPIO，但编译进内核后，系统启动不了，是什么原因？

#include <linux/init.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include <asm/io.h>




//#define GPIO0 0x44E07000


//#define GPIO1 0x4804C000


//#define GPIO2 0x481AC000


#define GPIO3 0x481AE000


#define GPIO_OE 0x134


//#define GPIO_DATAIN 0x138


#define GPIO_DATAOUT 0x13c


#define GPIO_CLEARDATAOUT 0x190


#define GPIO_SETDATAOUT 0x194


#define GPIO_CTRL 0x130






#define CONTROL_MODULE 0x44E10000


//#define SPIO_CS1 0x960 //gpio0_6


//#define ECAP0_IN 0x964


#define MCASP0_ACLKH 0x990 //gpio3_17


#define MCASP0_FSX 0x994 //gpio3_15






static struct class *leds_class;


static struct device *leds_class_dev;




int majors;




//struct LEDS{


//volatile unsigned long *gpio_oe;


//volatile unsigned long *gpio_datain;


//volatile unsigned long *gpio_dataout;


//volatile unsigned long *gpio_setdataout;


//volatile unsigned long *gpio_cleardataout;


//volatile unsigned long *gpio_ctrl;


//volatile unsigned long *spio_cs1;


//volatile unsigned long *ecap0_in;


 


//}_leds;




struct LEDS{


volatile unsigned long *gpio_oe;


volatile unsigned long *gpio_datain;


volatile unsigned long *gpio_dataout;


volatile unsigned long *gpio_setdataout;


volatile unsigned long *gpio_cleardataout;


volatile unsigned long *gpio_ctrl;


volatile unsigned long *mcasp0_aclkh;


volatile unsigned long *mcasp0_fsx;




}_leds;


struct LEDS *leds = &_leds;




static int led_open(struct inode *inode , struct file *file)


{


 printk("this is open!\n");


 return 0;


}




static int led_close(struct inode *inode , struct file *file)


{


 printk("this is close!\n");


 return 0;


}




static long led_ioctl(struct file *file , unsigned int cmd , 


 unsigned long arg)


{


 printk("cmd is : %d\n" , cmd);




// switch (cmd)


// {


 


// default:


// break;


// }


 return 0; 


}




static ssize_t led_read(struct file *file , char __user *buf , size_t count , loff_t *pos)


{


 printk("count is : %d\n" , count);


 return 0;


}




static ssize_t led_write(struct file *file , const char __user *buf , size_t count , loff_t *pos)


{




 int val;


 copy_from_user(&val,buf,count);


 printk("val is =%d\n",val);


 if (val==1)


 {


 *(leds->gpio_dataout)&=~((0x1<<6)|(0x1<<7));//设置gpio输出高/低电平




 }


 else


 {


 *(leds->gpio_dataout)|=((0x1<<6)|(0x1<<7));




 }




 return 0;


}




static struct file_operations fops = {


 .owner = THIS_MODULE,


 .open = led_open,


 .release = led_close,


 .unlocked_ioctl = led_ioctl,


 .read = led_read,


 .write = led_write,


};






static int __init test_init(void)


{




 majors = register_chrdev(0, "leds_drvS", &fops); // 注册, 告诉内核


 leds_class = class_create(THIS_MODULE, "ledsdrvS"); //自动创建设备节点


 leds_class_dev= device_create(leds_class, NULL, MKDEV(majors, 0), NULL, "ledsS");






 leds->gpio_oe = (volatile unsigned long *)ioremap(GPIO3 + GPIO_OE , sizeof(volatile unsigned long ));


 //leds->gpio_datain = (volatile unsigned long *)ioremap(GPIO3 + GPIO_DATAIN, sizeof(volatile unsigned long ));


 //leds->gpio_dataout = (volatile unsigned long *)ioremap_nocache(GPIO3 + GPIO_DATAOUT, sizeof(volatile unsigned long ));


 leds->gpio_dataout = (volatile unsigned long *)ioremap(GPIO3 + GPIO_DATAOUT, sizeof(volatile unsigned long ));


 leds->gpio_setdataout =( volatile unsigned long *)ioremap(GPIO3 + GPIO_SETDATAOUT, sizeof(volatile unsigned long ));


 leds->gpio_cleardataout = (volatile unsigned long *)ioremap(GPIO3 + GPIO_CLEARDATAOUT , sizeof(volatile unsigned long ));


 leds->gpio_ctrl=(volatile unsigned long *)ioremap(GPIO3+GPIO_CTRL,sizeof(volatile unsigned long ));


 leds->mcasp0_aclkh=(volatile unsigned long *)ioremap(CONTROL_MODULE+MCASP0_ACLKH,sizeof(volatile unsigned long ));


 leds->mcasp0_fsx=(volatile unsigned long *)ioremap(CONTROL_MODULE+MCASP0_FSX,sizeof(volatile unsigned long ));


 printk("insmod the leds module!\n");




 /*


 *配置相关引脚的pin_mux模式；


 *配置相关寄存器；


 *首先是寄存器OE，输出使能；设置0为输出使能；


 *其次是寄存器SETDATAOUT，设置允许输出位；设置1为允许；


 *最后是寄存器DATAOUT，设置输出高低电平；


 */




 *(leds->mcasp0_aclkh)|=(0x7);


 *(leds->mcasp0_fsx)|=(0x7);


 *(leds->gpio_ctrl)&=~(0x1);


 


 


 *(leds->gpio_oe) &= ~((0x1<<6)|(0x1<<7));


 *(leds->gpio_setdataout) |= ((0x1<<6)|(0x1<<7));




// *(leds->gpio_datain) |= ((0x1<<6)|(0x1<<7));


// *(leds->gpio_datain) &= ~((0x1<<6)|(0x1<<7));


 


 *(leds->gpio_dataout) |= ((0x1<<6)|(0x1<<7));


 *(leds->gpio_dataout) &= ~((0x1<<6)|(0x1<<7));




 return 0;


}




static void __exit test_exit(void)


{


 unregister_chrdev(majors, "leds_drvS"); // 卸载


 device_unregister(leds_class_dev);


 class_destroy(leds_class);


// *(leds->gpio_cleardataout) |= 0xffffffff;




 iounmap(leds->gpio_oe);


 //iounmap(leds->gpio_datain);


 iounmap(leds->gpio_dataout);


 iounmap(leds->gpio_setdataout);


 iounmap(leds->gpio_cleardataout);


 iounmap(leds->mcasp0_aclkh);


 iounmap(leds->gpio_ctrl);


 iounmap(leds->mcasp0_fsx);




}




module_init(test_init);


module_exit(test_exit);




MODULE_LICENSE("GPL");


MODULE_AUTHOR("xiaogao");


MODULE_DESCRIPTION("Class test");






Jian Zhou：




用insmode试过么？加载会出问题么？




shanshan wan：




回复 Jian Zhou:


用insmod 时出现Segmentation fault，用dmesg查看，多了以下信息：


[ 96.695288] insmod the leds module!


 [ 96.695310] Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa1ae130


 [ 96.703349] Internal error: : 1028 [#1] SMP THUMB2


 [ 96.708387] Modules linked in: gpio(O+)


 [ 96.712423] CPU: 0 Tainted: G W O (3.8.13 #10)


 [ 96.718200] PC is at test_init+0xbf/0x133 [gpio]


 [ 96.723052] LR is at test_init+0xa2/0x133 [gpio]


 [ 96.727900] pc : [<bf8020c0>] lr : [<bf8020a3>] psr: 60000033


 sp : dcf07e58 ip : 00000021 fp : bf800294


 [ 96.739948] r10: 00000000 r9 : bf802001 r8 : bf8002d0


 [ 96.745441] r7 : 00000001 r6 : 00000000 r5 : bf8003e4 r4 : bf800218


 [ 96.752290] r3 : fa1ae130 r2 : 00000027 r1 : 00000001 r0 : 00000000


 [ 96.759144] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA Thumb Segment user


 [ 96.766815] Control: 50c5387d Table: 9c9e0019 DAC: 00000015


 [ 96.772855] Process insmod (pid: 618, stack limit = 0xdcf06240)


 [ 96.779077] Stack: (0xdcf07e58 to 0xdcf08000)


 [ 96.783648] 7e40: bf8001d2 00000000


 [ 96.792231] 7e60: 00000000 bf800288 dcf07f58 c000868d bf802001 00000000 00000001 bf800288


 [ 96.800819] 7e80: bf800288 dcf07f58 00000000 00000001 bf8002d0 dca77780 00000001 c005b553


 [ 96.809422] 7ea0: bf800294 00007fff c0059379 00000000 fa2000d8 0000001c 0000002c c065eacc


 [ 96.818006] 7ec0: bf8003c4 c0398f80 e09f4530 dcf07eec b6f34cc4 20000033 ffffffff c05c6870


 [ 96.826593] 7ee0: 00180011 c000c1b5 e09f6000 b6f4a000 00000248 00000000 00000000 00000000


 [ 96.835176] 7f00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000


 [ 96.843758] 7f20: 00000000 00000000 00000000 00000000 20000033 00000000 b6f44000 b6f34cc4


 [ 96.852365] 7f40: 00000080 c000c824 dcf06000 00000000 00000000 c005b7d7 e09f0000 000062c8


 [ 96.860959] 7f60: e09f3e78 e09f3cb4 e09f60a8 00000404 00000644 00000000 00000000 00000000


 [ 96.869542] 7f80: 0000002b 0000002c 00000015 00000012 00000010 00000000 00000000 00000000


 [ 96.878123] 7fa0: 000210a0 c000c681 00000000 00000000 b6f44000 000062c8 b6f34cc4 00000002


 [ 96.886708] 7fc0: 00000000 00000000 000210a0 00000080 00021088 000062c8 b6f34cc4 00000000


 [ 96.895295] 7fe0: b6e9a890 bea64b98 b6f2d734 b6e9a8a0 60000010 b6f44000 9fefe821 9fefec21


 [ 96.903914] [<bf8020c0>] (test_init+0xbf/0x133 [gpio]) from [<c000868d>] (do_one_initcall+0x61/0xec)


 [ 96.913527] [<c000868d>] (do_one_initcall+0x61/0xec) from [<c005b553>] (load_module+0x10ff/0x1308)


 [ 96.922931] [<c005b553>] (load_module+0x10ff/0x1308) from [<c005b7d7>] (sys_init_module+0x7b/0x8e)


 [ 96.932342] [<c005b7d7>] (sys_init_module+0x7b/0x8e) from [<c000c681>] (ret_fast_syscall+0x1/0x46)


 [ 96.941749] Code: 0207 601a 6823 695b (681a) f022


 [ 96.946775] ---[ end trace 09c7d93bcbc542ab ]---






Jian Zhou：




回复 shanshan wan:


如果是GPIO控制LED的驱动，可以参考SDK06或者SDK07源代码目录下的\drivers\leds\leds-gpio.c来写，你的驱动感觉上有些问题。




shanshan wan：




回复 Jian Zhou:


当把以下注释掉，insmod接没问题，那要怎样才能操作这些寄存器呢？


//*(leds->mcasp0_aclkh)|=(0x7);


// *(leds->mcasp0_fsx)|=(0x7);


// *(leds->gpio_ctrl)&=~(0x1);


 


 


// *(leds->gpio_oe) &= ~((0x1<<6)|(0x1<<7));


// *(leds->gpio_setdataout) |= ((0x1<<6)|(0x1<<7));




//// *(leds->gpio_datain) |= ((0x1<<6)|(0x1<<7));


//// *(leds->gpio_datain) &= ~((0x1<<6)|(0x1<<7));


 


// *(leds->gpio_dataout) |= ((0x1<<6)|(0x1<<7));


 //*(leds->gpio_dataout) &= ~((0x1<<6)|(0x1<<7));






leo chen：




回复 shanshan wan:


可能是地址操作的问题


gpio的配置，使能，以及赋值，最好用系统自带的函数


gpio_set_value（）；


gpio_request（）；


等等‘


可参考http://bbs.eeworld.com.cn/thread-327156-1-1.html



		

								            

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