mini2440驱动-dm9000

linux内核：2.6.39

参考文档：http://blog.sina.com.cn/s/blog_63ac1cef0100ute3.html


 1) 添加网卡驱动的平台数据信息，包括：网卡的资源（地址资源、数据资源以及中断号等）、数据位数、网卡名称等。编辑文件arch/arm/plat-s3c24xx/devs.c，具体添加内容如下：
 
在文件开头添加：
38行： #include//在引用头文件处添加dm9000.h头文件，该文件包含S3C2410_CS4等定义 
 
在最后添加：

/* DM9000AEP 10/100 ethernet controller */
#define MACH_MY2440_DM9K_BASE (S3C2410_CS4 + 0x300)

static struct resource my2440_dm9k_resource[] = {
        [0] = {
                .start = MACH_MY2440_DM9K_BASE,
                .end = MACH_MY2440_DM9K_BASE + 3,
                .flags = IORESOURCE_MEM
        },
        [1] = {
                .start = MACH_MY2440_DM9K_BASE + 4,
                .end = MACH_MY2440_DM9K_BASE + 7,
                .flags = IORESOURCE_MEM
        },
        [2] = {
                .start = IRQ_EINT7,
                .end = IRQ_EINT7,
                .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
        }
};

/*
 * * The DM9000 has no eeprom, and it's MAC address is set by
 * * the bootloader before starting the kernel.
 * */
static struct dm9000_plat_data my2440_dm9k_pdata = {
        .flags = (DM9000_PLATF_16BITONLY | DM9000_PLATF_NO_EEPROM),
};

struct platform_device my2440_device_eth = {
        .name = "dm9000",
        .id = -1,
        .num_resources = ARRAY_SIZE(my2440_dm9k_resource),
        .resource = my2440_dm9k_resource,
        .dev = {
                .platform_data = &my2440_dm9k_pdata,
        },
};

EXPORT_SYMBOL(my2440_device_eth);

2) 导出my2440_device_eth变量。编辑arch/arm/plat-samsung/include/plat/devs.h文件，具体添加内容如下：

extern struct platform_device my2440_device_eth;

3) 添加my2440_device_eth到平台设备数组。编辑arch/arm/mach-s3c2440/mach-my2440.c文件，具体添加内容如下：

static struct platform_device *my2440_devices[] __initdata = {
    &s3c_device_ohci,
    &s3c_device_lcd,
    &s3c_device_wdt,
    &s3c_device_i2c0,
    &s3c_device_iis,
//lisi
    &s3c_device_nand,
    &s3c_device_rtc,
    &my2440_device_eth,
};

4)修改/drivers/net/dm9000.c文件。由于在common-smdk.c中设置了dm9000使用的系统资源是CS4，因此需要根据dm9000的芯片手册来设置BWSCON和BANKCON4寄存器。另外由于dm9000网卡中断信号为上升沿，因此需要在网卡注册中断前设置中断信号为上升沿有效。具体修改内容如下：
(1)添加处理s3c2440寄存器头文件，红色为增加部分的代码。

#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/io.h>

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

(2) dm9000_open()函数中添加对中断类型的处理

if (netif_msg_ifup(db))
        dev_dbg(db->dev, "enabling %s\n", dev->name);

    /* If there is no IRQ type specified, default to something that
     * may work, and tell the user that this is a problem */

#ifdef CONFIG_ARCH_S3C2410
    irqflags = IRQF_SHARED | IRQF_TRIGGER_RISING;
#else
    if (irqflags == IRQF_TRIGGER_NONE)
        dev_warn(db->dev, "WARNING: no IRQ resource flags set.\n");

    irqflags |= IRQF_SHARED;
#endif

    if (request_irq(dev->irq, dm9000_interrupt, irqflags, dev->name, dev))
        return -EAGAIN;

（3）dm9000_probe()函数中添加对BWSCON和BANKCON4寄存器的处理，具体的数值请查阅s3c2440A芯片手册

static int __devinit
dm9000_probe(struct platform_device *pdev)
{
    struct dm9000_plat_data *pdata = pdev->dev.platform_data;
    struct board_info *db;    /* Point a board information structure */
    struct net_device *ndev;
    const unsigned char *mac_src;
    int ret = 0;
    int iosize;
    int i;
    u32 id_val;

#if defined(CONFIG_ARCH_S3C2410)
    unsigned int oldval_bwscon;
    unsigned int oldval_bankcon4;
#endif

    /* Init network device */
    ndev = alloc_etherdev(sizeof(struct board_info));
    if (!ndev) {
        dev_err(&pdev->dev, "could not allocate device.\n");
        return -ENOMEM;
    }

    SET_NETDEV_DEV(ndev, &pdev->dev);

#if defined(CONFIG_ARCH_S3C2410)
    oldval_bwscon = *((volatile unsigned int *)S3C2410_BWSCON);
    *((volatile unsigned int *)S3C2410_BWSCON) = (oldval_bwscon & ~(3<<16)) |
        S3C2410_BWSCON_DW4_16 | S3C2410_BWSCON_WS4 | S3C2410_BWSCON_ST4;
    oldval_bankcon4 = *((volatile unsigned int *)S3C2410_BANKCON4);
    *((volatile unsigned int *)S3C2410_BANKCON4) = 0x1f7c;
#endif

    dev_dbg(&pdev->dev, "dm9000_probe()\n");

out:
    dev_err(db->dev, "not found (%d).\n", ret);

#if defined(CONFIG_ARCH_S3C2410)
    *((volatile unsigned int *)S3C2410_BWSCON) = oldval_bwscon;
    *((volatile unsigned int *)S3C2410_BANKCON4) = oldval_bankcon4;
#endif

    dm9000_release_board(pdev, db);
    free_netdev(ndev);

    return ret;

 由于s3c2440不能很好的从eeprom中读取网卡的MAC地址，因此需要在probe函数中手动设置网卡的MAC地址，即：在设置网卡MAC地址出屏蔽掉原来代码，手动添加自己的MAC

#ifdef CONFIG_ARCH_S3C2410
    mac_src = "handy";
    ndev->dev_addr[0] = 0x01;
    ndev->dev_addr[1] = 0x23;
    ndev->dev_addr[2] = 0x45;
    ndev->dev_addr[3] = 0x67;
    ndev->dev_addr[4] = 0x89;
    ndev->dev_addr[5] = 0xab;
#else

    mac_src = "eeprom";

    /* try reading the node address from the attached EEPROM */
    for (i = 0; i < 6; i += 2)
        dm9000_read_eeprom(db, i / 2, ndev->dev_addr+i);

    if (!is_valid_ether_addr(ndev->dev_addr) && pdata != NULL) {
        mac_src = "platform data";
        memcpy(ndev->dev_addr, pdata->dev_addr, 6);
    }

    if (!is_valid_ether_addr(ndev->dev_addr)) {
        /* try reading from mac */

        mac_src = "chip";
        for (i = 0; i < 6; i++)
            ndev->dev_addr[i] = ior(db, i+DM9000_PAR);
    }
#endif

5）编译并配置内核
  [*] Networking support --->
        Networking options --->
              <*> Unix domain sockets
              [*] TCP/IP networking
              [*] IP:kernel level autoconfiguration
              [*] IP:DHCP support
  [*] Devices Drivers --->
         [*] Network device support --->
              [*] Ethernet(10 or 100Mbit) --->
                        <*> DM9000 support

6）DM9000网卡的配置
1.修改文件系统的“/etc/init.d/rcS”,添加如下所示内容：
     ifconfig lo 127.0.0.1  //设置本地回环设备IP地址
     net_set&               //调用网络配置文件
2.在文件系统的/sbin目录下新建一个可执行文件“net_set”，其内容如下：
       #!/bin/sh
       echo Try to bring eth0 interface up ...>/dev/tq2440_serial0
      
       if [ -f /etc/net.conf ];then
              source /etc/net.conf
             
              ifconfig eth0 down
              ifconfig eth0 hw ether $MAC
              echo ifconfig eth0 hw ether $MAC > /dev/tq2440_serial0
              ifconfig eth0 $IPADDR netmask $NETMASK up
              echo ifconfig eth0 $IPADDR netmask $NETMASK up >      
                                                 /dev/tq2440_serial0
              route add default gw $GATEWAY
              echo add default gw $GATEWAY > /dev/tq2440_serial0
       else
              ifconfig eth0 hw ether 10:23:45:67:89:ab
              ifconfig eth0 192.168.1.6 netmask 255.255.255.0 up
              route add default gw 192.128.1.2
              echo ifconfig eth0 hw ether 10:23:45:67:89:ab >
                                                  /dev/tq2440_serial0
              echo ifconfig eth0 192.168.1.6 netmask 255.255.255.0 up>
                                                 /dev/tq2440_serial0
              echo route add default gw 192.128.1.2 >/dev/tq2440_serial0
       fi
 
       echo Done > /dev/tq2440_serial0
 
3.然后在文件系统的/etc目录下新建“net.conf”文件用于存放网络配置信息
       IPADDR=192.168.1.6
       NETMASK=255.255.255.0
       GATEWAY=192.168.1.2
       MAC=10:23:45:67:89:ab
  当要修改网卡的IP地址时，只需要修改“/etc/net.conf”文件的内容后，执行一下net_set命令即可
然后，重新制作根文件系统，烧到开发板。