am3354 fpga和gpmc驱动的问题

 最近在写一个am3354和FPGA通信的Linux驱动， FPGA是16位，异步，不复用引脚设备，使用的片选2，下面是我的驱动程序，无法实现两者的数据传输，跪求指教！

#include <linux/kernel.h> #include <linux/platform_device.h> #include <linux/gpio.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/delay.h> #include <plat/board.h> #include <plat/gpmc.h> #include <plat/gpmc-smc91x.h> #include <asm/uaccess.h> #include <linux/dma-mapping.h> #include <linux/string.h>

static int major ; static struct class *gpmc_fpga_cls; static struct device *gpmc_fpga_dev; static char __iomem *fpga_access_base; dma_addr_t fpga_phy_base;

#define GPCM_FPGA_CS              2            //FPGA选择通道3 #define FPGA_ACCESS_SIZE          SZ_16M//FPGA通道的大小

static struct gpmc_timings fpga_default_timings = {

 .sync_clk = 0,

 .cs_on = 0,  .cs_rd_off = 89,  .cs_wr_off = 57,

 .adv_on = 3,  .adv_rd_off = 9,  .adv_wr_off = 9,

 .we_on  = 3,  .we_off = 48,    .oe_off = 89,

 .access = 80,  .rd_cycle = 96,  .wr_cycle = 57,

}; static void gpmc_write_reg(int idx, u32 val) {  writel(val, gpmc->io_base + idx); }

static u32 gpmc_read_reg(int idx) {  return readl(gpmc->io_base + idx); }

static int gpmc_fpga_open(struct inode * inode, struct file * file) {  unsigned long val;

 /*申请GPMC通道*/     if(gpmc_cs_request(GPCM_FPGA_CS,FPGA_ACCESS_SIZE,&fpga_phy_base) < 0)     {      printk("fail to gpmc_cs_request!\n");   return -1;     }

 if (!request_mem_region(fpga_phy_base, FPGA_ACCESS_SIZE,     "gpmc_fpga_mem"))

 {   printk("fail to request_mem_region\n");   return -EBUSY;  }

 else   printk("fpga_phy_base = 0x%0x\n",fpga_phy_base);  

 fpga_access_base = ioremap(fpga_phy_base,FPGA_ACCESS_SIZE);  

 if(fpga_access_base == NULL)  {   printk("fail to ioremap!\n");   return -ENOMEM;  }    

gpmc_write_reg(GPMC_IRQENABLE, 0);  

gpmc_write_reg(GPMC_TIMEOUT_CONTROL, 0);  

 /*3,利用内核提供的函数设置时序*/

 gpmc_cs_set_timings(GPCM_FPGA_CS,&fpga_default_timings);    

return 0; }

static ssize_t gpmc_fpga_read(struct file *flle, char __user *ubuf, size_t count, loff_t *ppos)

{  int ret = 0;  

unsigned int temp;

 temp = readl(fpga_access_base + 0x31);  

if(copy_to_user(ubuf,&temp ,count))

  {    ret = -EINVAL;   }

 return ret; }

static ssize_t gpmc_fpga_write(struct file *file, const char __user *ubuf, size_t count, loff_t *ppos)

{  int ret = 0;

 unsigned int temp;

 if(copy_from_user(&temp ,ubuf ,count))   ret = -EINVAL;  else   {    writel(temp,fpga_access_base + 0x31);    *ppos += count;    ret = count;   }

 return ret;

}

static struct file_operations  gpmc_fpga_fops =

{  .open  = gpmc_fpga_open,

 .read  = gpmc_fpga_read,

 .write = gpmc_fpga_write,  

.owner = THIS_MODULE, };

static int gpmc_fpga_init(void)

{  int val;  

printk("gpmc_fpga_init\n");  

major = register_chrdev(0, "gpmc_fpga", &gpmc_fpga_fops);  

gpmc_fpga_cls = class_create(THIS_MODULE, "gpmc_fpga");  

gpmc_fpga_dev = device_create(gpmc_fpga_cls, NULL, MKDEV(major, 0), NULL, "gpmc_fpga_dev"); /* /dev/buttons */

 return 0; }

static void gpmc_fpga_exit(void)

{  iounmap(fpga_access_base);

gpmc_cs_free(GPCM_FPGA_CS);  

device_destroy(gpmc_fpga_cls,MKDEV(major, 0));  

class_destroy(gpmc_fpga_cls);

 unregister_chrdev(major,"gpmc_fpga");    return ; }

module_init(gpmc_fpga_init);

module_exit(gpmc_fpga_exit);

MODULE_LICENSE("GPL");

leo chen：

要说的详细一点嘛

使用的是哪个版本的SDK

如何测试的，测试结果是什么样的