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原创作者：南京邮电大学  通信与信息系统专业 研二 魏清

三．网络设备驱动分析

我们先看看dm9000.c驱动的模块加载函数

static struct platform_driver dm9000_driver = {

       .driver     = {

              .name    = "dm9000",  //驱动名

              .owner    = THIS_MODULE,

              .pm  = &dm9000_drv_pm_ops, //电源相关操作

       },

       .probe   = dm9000_probe,  //探测函数

       .remove  = __devexit_p(dm9000_drv_remove),

};

static int __init  dm9000_init(void)

{

#if defined(CONFIG_ARCH_S3C2410)  //调整DM9000所用的位宽寄存器

       unsigned int oldval_bwscon = *(volatile unsigned int *)S3C2410_BWSCON;

       unsigned int oldval_bankcon4 = *(volatile unsigned int *)S3C2410_BANKCON4;

       *((volatile unsigned int *)S3C2410_BWSCON) =

                     (oldval_bwscon & ~(3<<16)) | S3C2410_BWSCON_DW4_16 | S3C2410_BWSCON_WS4 | S3C2410_BWSCON_ST4;

       *((volatile unsigned int *)S3C2410_BANKCON4) = 0x1f7c;

#endif

       printk(KERN_INFO "%s Ethernet Driver, V%s\n", CARDNAME, DRV_VERSION);

       return platform_driver_register(&dm9000_driver); //注册驱动

}

下面我们重点关注下probe