mini2440 spi驱动总结(2)

port_status=readl(GPECON);
 port_status&=~GPE_DEFAULT;
 port_status|=GPE_DEFAULT;
 writel(port_status,GPECON);//GPE control
 
 port_status=0x0;
 port_status=readl(GPEUP);
 port_status&=~(1<<13|1<<12|1<<11);
 writel(port_status,GPEUP);//GPE_UP

port_status=0x0;
 port_status=readl(GPGUP);
 port_status&=~(1<<2|1<<3|1<<6);
 writel(port_status,GPGUP);//GPG_UP
 
 //disable_irq(IRQ_SPI0);
 port_status=readl(SPPRE0);//SPI Baud speed
 port_status=0x31;//PCLK=50MHz SPICLK=PCLK/2/(value+1)=1MHz,对于CC2500最大支持500K，一般采用250K
 writel(port_status,SPPRE0);

port_status=readl(SPCON0);
 port_status=SPI_CON_DEFAULT;
 writel(port_status,SPCON0);//SPI control

 port_status=readl(SPPIN0);
 port_status&=~(0<<0|1<<1|1<<2);
 port_status|=(1<<2|1<<1|0<<0);
 writel(port_status,SPPIN0);//SPI pin setting

port_status=readl(SCRPND);
 port_status|=(1<<22);
 writel(port_status,SCRPND);
 
 port_status=readl(INTPND);
 port_status|=(1<<22);
 writel(port_status,INTPND);

//enable_irq(IRQ_SPI0);
}
//-----------------------------------------------------------------------------------------------------------------
static int spi_open(struct inode *inode,struct file *filp)
{
 filp->private_data=spi_devp;
 mini2440_spi_config();
 //filep->private_data=spi_devp;
 s3c2410_gpio_setpin(S3C2410_GPG(2),0);
 printk("-----------------------------------\n");
 printk("MINI2440 SPI GPG GPE CLK set over\n");
 printk("-----------------------------------\n");
 return 0;
}

static int spi_release(struct inode *inode,struct file *filp)
{
 printk("-----------------------------\n");
 printk("S3C2440-mini2440_spi closed\n");
 printk("------------------------------\n");
 return 0;
}
//-----------------------------------------------------------------------------------------------------------
static ssize_t spi_read(struct file *filp,char __user *buf,size_t count)
{
 //char *spiRxData;
 struct spi_dev *dev=filp->private_data;
 copy_to_user(buf,dev->dataRx,count);
 return 0;
}

static ssize_t spi_write(struct file *filp,char __user *buf,size_t count)
{
 volatile int endSpiTx=0;
 volatile char spiTxData[4];
 //int config;
 int i=0;
 //char str[20];
 //char *txStr,*rxStr;
 //volatile char *spiTxStr,*spiRxStr;
 unsigned char string;
 unsigned int port_status;
 struct spi_dev *dev=filp->private_data;
 //filp->private_data;
 //获得设备结构体的指针
 copy_from_user(dev->dataTx,buf,count);
 for(i=0;i<4;i++)
 {
  spiTxData[i]=dev->dataTx[i];
 }
 printk("receive form user is %s\n",spiTxData);
 while(endSpiTx==0)
 {
  //if(*spiTxData!='\0')
  while(!SPI_TXRX_READY)
   printk("SPI TXRX unready\n"); 
  for(i=0;i<4;i++)
  {
     
   //s3c2410_gpio_setpin(S3C2410_GPG(2),0);//使能从SPI  
  
   writeb(spiTxData[i],SPTDAT0);//=*(spiTxData++);
   string=readb(SPTDAT0);
   printk("transfer char=%c\n",string);
   //while(!SPI_TXRX_READY);
   dev->dataRx[i]=readb(SPRDAT0);
   printk("----------------------------\n");  
   printk("receive char=%c\n",dev->dataRx[i]);
   printk("----------------------------\n");
   //s3c2410_gpio_setpin(S3C2410_GPG(2),1);//解除使能从SPI
   //i++;
  }
  endSpiTx=1;
 }
 port_status=readl(SPCON0);
 port_status|=((0<<5)|(0<<4)|(1<<3)|(1<<2)|(0<<1)|(0<<0));
 writel(port_status,SPCON0);
 return 0;
}
//---------------------------------------------------------------------------------------------------------------
static const struct file_operations spi_fops={
 .owner=THIS_MODULE,
 .open=spi_open,
 .release=spi_release,
 .read=spi_read,
 .write=spi_write,
};
static void spi_interrupt(int irq,void *dev_id,struct pt_regs *reg)
{
 unsigned int port_status;
 unsigned int i=0;
 volatile int endSpiRx=0;