DM9000驱动修改

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硬件平台：FL2440（s3c2440）

内核版本：linux-3.0-rc4

主机平台：centos6.5

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FL2440和DM9000的引脚链接图

1.修改devs.c

vi arch/arm/plat-s3c24xx/devs.c

1.1增加头文件

 45 #if defined(CONFIG_DM9000)||defined(CONFIG_DM9000_MODULE)
 46 #include <linux/dm9000.h>
 47 #endif

1.2增加DM9000平台设备结构

增加如下代码：

static struct resource s3c_dm9000_resource[] = { 
    [0] = { 
    .start = S3C2410_CS4,           /* ADDR2=0，发送地址时使用*/
    .end   = S3C2410_CS4+ 3, 
    .flags = IORESOURCE_MEM   
    }, 
    [1]={ 
    .start = S3C2410_CS4 + 4,      /* ADDR2=1，传输数据时使用*/
    .end   = S3C2410_CS4 + 4 + 3, 
    .flags = IORESOURCE_MEM 
    }, 
    [2] = { 
    .start = IRQ_EINT7, 		   /* 中断为外部7号中断 */
    .end   = IRQ_EINT7,            /* 中断为外部7号中断 */
    .flags = IORESOURCE_IRQ        /* 资源标志为中断资源 */
    }, 
}; 

/* 定义平台数据 */
static struct dm9000_plat_data s3c_device_dm9000_platdata = { 
        .flags= DM9000_PLATF_16BITONLY, 
}; 

/* 定义平台设备 */
struct platform_device s3c_device_dm9000 = { 
    .name= "dm9000",       //设备名，该名称与平台设备驱动中的名称一致
    .id= 0, 
    .num_resources= ARRAY_SIZE(s3c_dm9000_resource), 
    .resource= s3c_dm9000_resource,                       //定义设备的资源
    .dev= { 
            .platform_data = &s3c_device_dm9000_platdata, //定义平台数据
     } 
}; 

//导出函数符号，保存函数地址和名称
EXPORT_SYMBOL(s3c_device_dm9000);

1.3加入内核设备列表中

vi arch/arm/plat-s3c24xx/common-smdk.c

修改内容如下：

204 static struct platform_device __initdata *smdk_devs[] = {
205         &s3c_device_nand,
206         &s3c_device_dm9000, //added
207         &smdk_led4,
208         &smdk_led5,
209         &smdk_led6,
210         &smdk_led7,
211 };

此外，还要在devs.h添加声明

vi arch/arm/plat-samsung/include/plat/devs.h 

添加如下：

142 extern struct platform_device s3c_device_dm9000;

2.修改dm9000.c

vim drivers/net/dm9000.c

2.1添加头文件

#if defined(CONFIG_ARCH_S3C2410)
#include <mach/regs-mem.h>
#endif

2.2设置存储控制器

函数dm9000_probe

1373     dev_dbg(&pdev->dev, "dm9000_probe()
");
1374 
		//added!!
1375 #if defined(CONFIG_ARCH_S3C2410)
1376     *((volatile unsigned int *)S3C2410_BWSCON) = (oldval_bwscon & ~(3<<16)) | S3C2410_BWSCON_DW4_16 | S3C2410_BWSCON     _WS4 | S3C2410_BWSCON_ST4;
1377     *((volatile unsigned int *)S3C2410_BWSCON) = (oldval_bwscon & ~(3<<16)) | S3C2410_BWSCON_DW4_16 ;
1378     *((volatile unsigned int *)S3C2410_BANKCON4) = 0x1f7c;
1379 #endif
1380     

/*********************************************/
1563 #if defined(CONFIG_ARCH_S3C2410)
1564     printk("Now use the default MAC address: 10:23:45:67:89:ab
");
1565     mac_src = "EmbedSky";
1566     ndev->dev_addr[0] = 0x10;
1567     ndev->dev_addr[1] = 0x23;
1568     ndev->dev_addr[2] = 0x45;
1569     ndev->dev_addr[3] = 0x67;
1570     ndev->dev_addr[4] = 0x89;
1571     ndev->dev_addr[5] = 0xab;
1572 #else
1573     mac_src = "eeprom";
1574     /* try reading the node address from the attached EEPROM */
1575     for (i = 0; i < 6; i += 2)
1576         dm9000_read_eeprom(db, i / 2, ndev->dev_addr+i);
1577 
1578     if (!is_valid_ether_addr(ndev->dev_addr) && pdata != NULL) {
1579         mac_src = "platform data";
1580         memcpy(ndev->dev_addr, pdata->dev_addr, 6);
1581     }
1582 
1583     if (!is_valid_ether_addr(ndev->dev_addr)) {
1584         /* try reading from mac */
1585 
1586         mac_src = "chip";
1587         for (i = 0; i < 6; i++)
1588             ndev->dev_addr[i] = ior(db, i+DM9000_PAR);
1589     }
1590 
1591     if (!is_valid_ether_addr(ndev->dev_addr))
1592         dev_warn(db->dev, "%s: Invalid ethernet MAC address. Please "
1593              "set using ifconfig
", ndev->name);
1594 #endif

/*********************************************/
1633 out:
1634     dev_err(db->dev, "not found (%d).
", ret);
1635 
1636 #if defined(CONFIG_ARCH_S3C2410)
1637     *((volatile unsigned int *)S3C2410_BWSCON)   =  oldval_bwscon;
1638     *((volatile unsigned int *)S3C2410_BANKCON4) =  oldval_bankcon4;
1639 #endif
1640 
1641     dm9000_release_board(pdev, db);
1642     free_netdev(ndev);
1643 
1644     return ret;
1645 }

2.3注册中断

在注册中断时，指定触发方式为上升沿触发。

函数dm9000_open()

1172 #if defined (CONFIG_ARCH_S3C2410)
1173     if(request_irq(dev->irq,&dm9000_interrupt,IRQF_SHARED|IRQF_TRIGGER_RISING,dev->name,dev))
1174 #else
1175     if(request_irq(dev->irq,&dm9000_interrupt,IRQF_SHARED,dev->name,dev))
1176 #endif
1177     //if (request_irq(dev->irq, dm9000_interrupt, irqflags, dev->name, dev))
1178         return -EAGAIN;

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参考文献：

http://blog.chinaunix.net/uid-22561766-id-1772768.html
http://blog.csdn.net/geekcome/article/details/6609742#
http://www.cnblogs.com/xilentz/archive/2010/07/12/1775620.html

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