linux-2.6.26下SPI1(4) S3C2440 spi驱动简单测试

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基础请参考：linux-2.6.26下SPI1(3) S3C2440 spi驱动简单测试

说明：

1、GPIO控制使用相关的宏即可，不用wirte read相关函数

2、寄存器读写推荐使用ioread iowrite相关函数，不推荐直接操作指针

3、内核源码需添加SPI相关注册

4、内核配置需添加SPI

static int io_init(void)
{
   unsigned char cmd;
//    struct resource *res;
//    int size;

   //2: 端口功能配置

   // RST1
   s3c2410_gpio_cfgpin(S3C2410_GPG8, S3C2410_GPG8_OUTP);
   s3c2410_gpio_setpin(S3C2410_GPG8, 1);

   // RST2
   s3c2410_gpio_cfgpin(S3C2410_GPA11, S3C2410_GPA11_OUT);
   s3c2410_gpio_setpin(S3C2410_GPA11, 1);

   // CS1
   s3c2410_gpio_cfgpin(S3C2410_GPA1, S3C2410_GPA1_OUT);
   s3c2410_gpio_setpin(S3C2410_GPA1, 1);

   // CS2
   s3c2410_gpio_cfgpin(S3C2440_GPJ12, S3C2440_GPJ12_OUTP);
   s3c2410_gpio_setpin(S3C2440_GPJ12, 1);


   // GPG 5 6 7配置为SPI接口 SPI1
   s3c2410_gpio_cfgpin(S3C2410_GPG5, S3C2410_GPG5_SPIMISO1);
   s3c2410_gpio_cfgpin(S3C2410_GPG6, S3C2410_GPG6_SPIMOSI1);
   s3c2410_gpio_cfgpin(S3C2410_GPG7, S3C2410_GPG7_SPICLK1);

   //    SPPRE1 = 0x10; // PCLK/2/(X+1) 应小于25M PCLK=400M X=0x10 BAUD=11.8M X最小为7
   cmd =0x18;
   iowrite8(cmd,spi_sppre1);// 波特率设置
   mdelay(10);
   cmd=ioread8(spi_sppre1);// 读取错误
   printk(KERN_EMERG "spi_sppre1=%#x readb :%#x \n",(int )spi_sppre1,cmd);

   cmd=ioread8(spi_spcon1);//
   cmd=(0<<6)|(0<<5)|(1<<4)|(1<<3)|(0<<2)|(0<<1)|(0<<0);
   iowrite8((char)cmd,spi_spcon1);//

   cmd=ioread8(spi_sppin1);//
   cmd=(0<<2)|(0<<0);
   iowrite8((char)cmd,spi_sppin1);//

   return 0;

}

int spi_init_test(void)
{
   unsigned char tmp=0;


   spi_spcon1 = (int *)ioremap(0x59000020,1);
   spi_spsta1 = (int *)ioremap(0x59000024,1);
   spi_sppin1 = (int *)ioremap(0x59000028,1);
   spi_sppre1 = (int *)ioremap(0x5900002c,1);
   spi_sptdat1 = (int *)ioremap(0x59000030,1);
   spi_sprdat1 = (int *)ioremap(0x59000034,1);
    printk("Init spi success!\n");

   tmp=0;
   *spi_sppre1=0x18;
   tmp=*spi_sppre1;
   printk("readByte=%#x \n",tmp);

   tmp=0x55;
   iowrite8(tmp,spi_sppre1);
   tmp=0;
   tmp=ioread8(spi_sppre1);
   printk("ioread8=%#x \n",tmp);

   io_init();
   spi_data_test();

   return 0;
}

调试读写寄存器打印正确。SPI读写也成功，读写部分代码就不贴了，比较简单。