TI中文支持网大家好，我用的是异步传输，地址数据不共用地址数据，单独读写，我在board_am335xevm.c下面修改了如下信息
static struct pinmux_config gpmc_fpga_pin_mux[] = {
{"gpmc_ad0.gpmc_ad0", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad1.gpmc_ad1", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad2.gpmc_ad2", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad3.gpmc_ad3", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad4.gpmc_ad4", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad5.gpmc_ad5", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad6.gpmc_ad6", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad7.gpmc_ad7", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad8.gpmc_ad8", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad9.gpmc_ad9", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad10.gpmc_ad10", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad11.gpmc_ad11", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad12.gpmc_ad12", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad13.gpmc_ad13", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad14.gpmc_ad14", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad15.gpmc_ad15", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_a1.gpmc_a1", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA},
{"gpmc_a2.gpmc_a2", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA},
{"gpmc_a3.gpmc_a3", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA},
{"gpmc_a4.gpmc_a4", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA},
{"gpmc_a5.gpmc_a5", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA},
{"gpmc_a6.gpmc_a6", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA},
{"gpmc_a7.gpmc_a7", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA},
{"gpmc_a8.gpmc_a8", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA},
{"gpmc_csn1.gpmc_csn1", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_oen_ren.gpmc_oen_ren", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_wen.gpmc_wen", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_clk.gpmc_wait1", OMAP_MUX_MODE2 | AM33XX_PIN_INPUT_PULLUP},
{NULL, 0},
}; //引脚的定义
static void gpmc_fpga_init(void)
{
//struct gpmc_devices_info gpmc_device[2] ={
//{NULL, GPMC_DEVICE_NOR},
//};
//omap_init_gpmc(gpmc_device,sizeof(gpmc_device));
setup_pin_mux(gpmc_fpga_pin_mux);
//omap_init_elm();
}
{gpmc_fpga_init, DEV_ON_BASEBOARD,PROFILE_ALL},
6个寄存器的配置如下
#define STNOR_GPMC_CONFIG1 0x00251000
#define STNOR_GPMC_CONFIG2 0x00080801
#define STNOR_GPMC_CONFIG3 0x00020201
#define STNOR_GPMC_CONFIG4 0x0602c662
#define STNOR_GPMC_CONFIG5 0x01050808
#define STNOR_GPMC_CONFIG6 0x05070142
//#define STNOR_GPMC_CONFIG7 0x00000f50
请问各位在board_am335xevm.c中的static void gpmc_fpga_init(void) 函数里是否应该加上omap_init_gpmc(gpmc_device,sizeof(gpmc_device));和omap_init_elm();
joke ness：
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 0x00000f50static 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);
joke ness：
回复 joke ness:
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
joke ness：
回复 joke ness:
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
joke ness：
回复 Jian Zhou:
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
joke ness：
回复 Jian Zhou:
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？
Jian Zhou：
回复 joke ness:
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
joke ness：
回复 Jian Zhou:
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？
雷工：
回复 Jian Zhou:
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？
Yonghui Chang：
回复 joke ness:
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
