am335x的GPMC驱动问题

驱动是按照网上的一个帖子写的http://bbs.eeworld.com.cn/thread-333652-1-1.html。做了一点修改该，下面是我的驱动

#define STNOR_GPMC_CONFIG1 0x00251000 //002a2000,28601000
#define STNOR_GPMC_CONFIG2 0x00080801//0x00011001
#define STNOR_GPMC_CONFIG3 0x00020201
#define STNOR_GPMC_CONFIG4 0x0602c662//0x08031003
#define STNOR_GPMC_CONFIG5 0x01050808//0x000f1111
#define STNOR_GPMC_CONFIG6 0x05070142//0x0f030080
//#define STNOR_GPMC_CONFIG7 0x00000f50
static const u32 gpmc_nor[7] = {
STNOR_GPMC_CONFIG1,
STNOR_GPMC_CONFIG2,
STNOR_GPMC_CONFIG3,
STNOR_GPMC_CONFIG4,
STNOR_GPMC_CONFIG5,
STNOR_GPMC_CONFIG6,
//STNOR_GPMC_CONFIG7,
0,

};

int fpga_ioctl(struct file *filp,unsigned int cmd,unsigned long arg)
{
ssize_t status;
char write_buff[] = "the gpmc driver is ok!";
switch(cmd)
{
case 0:
if(down_interruptible(&fpga_dev.sem))
return -ERESTARTSYS;
fpga_dev.addr = arg;
printk("\n*********write add = 0x%x\n",fpga_dev.addr);
//up(&fpga_dev.sem);
break;
case 1:
if(down_interruptible(&fpga_dev.sem))
return -ERESTARTSYS;
if(copy_to_user(((char *)arg),write_buff,sizeof(write_buff)+1))
{
status = -EFAULT;
goto read_done_xd;
}
//printk("read_buff_done:%s\n\r",write_buff);
//up(&fpga_dev.sem);
break;
default:
return ENOTTY;
}

read_done_xd:
{
printk("ioctl done!!\n\r");
up(&fpga_dev.sem);
}
return status;

}

static ssize_t fpga_write(struct file *filp, const char __user *buff, size_t count, loff_t *f_pos)
{
ssize_t status;
size_t len = USER_BUFF_SIZE - 1;
int i,tmp;

if (count == 0)
return 0;

if (down_interruptible(&fpga_dev.sem))
return -ERESTARTSYS;

if (len > count)
len = count;

memset(fpga_dev.user_buff, 0, USER_BUFF_SIZE);

if (copy_from_user(fpga_dev.user_buff, buff, len)) {
status = -EFAULT;
goto fpga_write_done;
}

/* do something with the user data */

printk("fpga_write_xd\n");
for (i = 0; i < len; i=i+2) {
tmp = fpga_dev.user_buff[i] | fpga_dev.user_buff[i+1] << 8;
writew(tmp,fpga_base+fpga_dev.addr+fpga_dev.addr); //在指定地址里写入数据16BIT;
}

for (i = 0; i < len; i++) {
printk("0x%x ",fpga_dev.user_buff[i]);
}

printk("\n");

fpga_write_done:
printk("*******before write up sem******\n");

up(&fpga_dev.sem);
printk("*******after write up sem******\n");

return status;
}

static ssize_t fpga_read(struct file *filp, const char __user *buff, size_t count, loff_t *f_pos)
{
size_t status;
size_t len = USER_BUFF_SIZE -1;

if(count == 0)
return 0;
printk("*******before read down sem******\n");
if(down_interruptible( &fpga_dev.sem))
return -ERESTARTSYS;
printk("*******after read down sem******\n");
if(len>count)
len = count;

memset(fpga_dev.user_buff,0,USER_BUFF_SIZE);
printk("*******before readb******\n");
fpga_dev.user_buff[0]= readb(fpga_base+fpga_dev.addr+fpga_dev.addr);
fpga_dev.user_buff[1]= readb(fpga_base+fpga_dev.addr+fpga_dev.addr+1);
printk("fpga_read_xd len= \n");
if(copy_to_user(buff,fpga_dev.user_buff,len))
{
status = -EFAULT;
goto fpga_read_done;
}

fpga_read_done:
printk("fpga_read_done_xd\n");
up(&fpga_dev.sem);

return status;

}

static int fpga_open(struct inode *inode, struct file *filp)
{
int status = 0;

if (down_interruptible(&fpga_dev.sem))
return -ERESTARTSYS;

if (!fpga_dev.user_buff)
{
fpga_dev.user_buff = kmalloc(USER_BUFF_SIZE, GFP_KERNEL);

if (!fpga_dev.user_buff)
{
printk(KERN_ALERT "fpga_open: user_buff alloc failed\n");
status = -ENOMEM;
}
}

up(&fpga_dev.sem);

return status;
}

static const struct file_operations fpga_fops = {
.owner = THIS_MODULE,
.open = fpga_open,
.read = fpga_read,
.write = fpga_write,
.unlocked_ioctl = fpga_ioctl,
};

static int __init fpga_init_cdevice(void)
{
int error;
u32 val;

fpga_dev.devt = MKDEV(251,0);

error = alloc_chrdev_region(&fpga_dev.devt,0,1,"fpga");
if (error)
{
printk(KERN_ALERT "alloc_chrdev_region() failed: %d\n", error);
return error;
}

cdev_init(&fpga_dev.cdev, &fpga_fops);
fpga_dev.cdev.owner = THIS_MODULE;

error = cdev_add(&fpga_dev.cdev, fpga_dev.devt, 1);
if (error)
{
printk(KERN_ALERT "cdev_add() failed: %d\n", error);
unregister_chrdev_region(fpga_dev.devt, 1);
return error;
}

printk("Getting Chip Select\n");

val = gpmc_cs_read_reg(GPMC_CS,GPMC_CS_CONFIG7); //关闭片选
val &= ~GPMC_CONFIG7_CSVALID;
gpmc_cs_write_reg(GPMC_CS,GPMC_CS_CONFIG7,val);

gpmc_cs_configure(GPMC_CS, GPMC_SET_IRQ_STATUS, 0); /*set irq status*/
gpmc_cs_configure(GPMC_CS, GPMC_ENABLE_IRQ, 0); /*disable irqs*/

gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG1, gpmc_nor[0]);
gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG2, gpmc_nor[1]);
gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG3, gpmc_nor[2]);
gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG4, gpmc_nor[3]);
gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG5, gpmc_nor[4]);
gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG6, gpmc_nor[5]);
//gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG7, gpmc_nor[6]);

val = gpmc_cs_read_reg(GPMC_CS, GPMC_CS_CONFIG7);
printk("GPMC_CS_CONFIG7 value 0x%x\n", val);

if (gpmc_cs_request(GPMC_CS, SZ_2K, (unsigned long *)&mem_base) < 0)
{
printk(KERN_ERR "Failed request for GPMC mem for usrp_e\n");
return -1;
}

printk("Got CS2, address = %lx\n", mem_base);

if (!request_mem_region(mem_base, SZ_2K, "mem_fpga"))
{
printk(KERN_ERR "Request_mem_region failed.\n");
gpmc_cs_free(GPMC_CS);
return -1;
}

fpga_base = ioremap(mem_base, SZ_2K);

gpmc_cs_configure(GPMC_CS, GPMC_ENABLE_IRQ, 1);

val = gpmc_cs_read_reg(GPMC_CS,GPMC_CS_CONFIG7);
val |= GPMC_CONFIG7_CSVALID;
gpmc_cs_write_reg(GPMC_CS,GPMC_CS_CONFIG7,val);

return 0;
}

static int __init fpga_init_class(void)
{
struct device *device;

fpga_dev.class = class_create(THIS_MODULE, "fpga");

if (IS_ERR(fpga_dev.class))
{
printk(KERN_ALERT "class_create(fpga) failed\n");
return PTR_ERR(fpga_dev.class);
}

device = device_create(fpga_dev.class, NULL, fpga_dev.devt, NULL, "fpga");

if (IS_ERR(device))
{
class_destroy(fpga_dev.class);
return PTR_ERR(device);
}

return 0;
}

static int __init fpga_init(void)
{
printk(KERN_INFO "fpga_init()\n");

memset(&fpga_dev, 0, sizeof(struct fpga_dev));

sema_init(&fpga_dev.sem, 1);

if (fpga_init_cdevice())
goto init_fail_1;

if (fpga_init_class())
goto init_fail_2;

return 0;

init_fail_2:
cdev_del(&fpga_dev.cdev);
unregister_chrdev_region(fpga_dev.devt, 1);

init_fail_1:

return -1;
}
module_init(fpga_init);

static void __exit fpga_exit(void)
{
printk(KERN_INFO "fpga_exit()\n");

device_destroy(fpga_dev.class, fpga_dev.devt);
class_destroy(fpga_dev.class);

cdev_del(&fpga_dev.cdev);
unregister_chrdev_region(fpga_dev.devt, 1);

release_mem_region(mem_base, SZ_2K);
gpmc_cs_free(GPMC_CS);
iounmap(fpga_base);

if (fpga_dev.user_buff)
kfree(fpga_dev.user_buff);
}
module_exit(fpga_exit);

int fd,i,res;
unsigned char buf[PAGE_SIZE];

unsigned char read_buff[2];

printf("GPMC Test start\n\r");
fd=open(FPGA_DEV,O_RDWR);
if(fd<0)
{
printf("Can't Open %s !!!\n\r",FPGA_DEV);
return -1;
}

for(i=0;i<sizeof(buf);i++)
{
buf[i] = i%256;
}

ioctl(fd,0,0xaa);
//ioctl(fd,1,read_buff);
//printf("%s\n\r",read_buff);

for(i=0;i<100;i++)
{
write(fd,&buf,PAGE_SIZE);
}
//read(fd,&read_buff,2);
//printf(" read from gpmc : 0x%x,0x%x\n\r",read_buff[1],read_buff[0]);

close(fd);
return 0;

这个是测试程序，但是每次都只写入一次10个字节，到下一个循环式就卡死了

在第二fpga_write那里就卡住了。。。

printk("fpga_write_xd\n");
for (i = 0; i < len; i=i+2) {
tmp = fpga_dev.user_buff[i] | fpga_dev.user_buff[i+1] << 8;
writew(tmp,fpga_base+fpga_dev.addr+fpga_dev.addr); //在指定地址里写入数据16BIT;
}

求大家帮忙分析

进一步发现在第二轮写时在写第7第8字节时就卡在了writew。不知道什么原因

谢谢，是config配置的问题，问一下，为什么我每次配置了wait后就传不了数据，就像上面说的一样，数据卡死，取消wait就一切正常

请问如何使用wait信号，是不是只要设置寄存器就可以了，要申请中断号吗？

我们的TRM的7.1.3.3.8.3里面有有关wait信号的使用，应该是不需要中断的，也没看到系统中断list里面有这个中断号。

其实wait这个信号主要还是接NAND或者NOR才用的

有个中断使能寄存器

这里也有关于wait信号中断的说明，所以想问是不是只要设置寄存器就可以，不需要自己写中断处理函数，系统会自己插入时钟？

jian  你好

am335x   能和fpga通信吗？？？    如果能通信., 用什么接口,   用什么方式？  

你好，请问你有没有写相关的博客，刚好做这个方向，一头雾水