Mini2440 DM9000 驱动分析（二）

在真正的开始分析dm9000 driver的probe之前，首先来看看dm9000 驱动中几个十分重要的结构

1、dm9000_driver

static struct platform_driver dm9000_driver = {

.driver = {

.name    = "dm9000",

.owner = THIS_MODULE,

.pm = &dm9000_drv_pm_ops,

},

.probe   = dm9000_probe,

.remove  = __devexit_p(dm9000_drv_remove),

};

dm9000_driver是platform_driver结构体变量，其中包含了重要的：驱动的名字（用来match）和几个重要操作函数。

2、dm9000_netdev_ops

static const struct net_device_ops dm9000_netdev_ops = {

.ndo_open = dm9000_open,

.ndo_stop = dm9000_stop,

.ndo_start_xmit = dm9000_start_xmit,

.ndo_tx_timeout = dm9000_timeout,

.ndo_set_multicast_list = dm9000_hash_table,

.ndo_do_ioctl = dm9000_ioctl,

.ndo_change_mtu = eth_change_mtu,

.ndo_validate_addr = eth_validate_addr,

.ndo_set_mac_address = eth_mac_addr,

#ifdef CONFIG_NET_POLL_CONTROLLER

.ndo_poll_controller = dm9000_poll_controller,

#endif

};

dm9000_netdev_ops是net_device_ops结构体变量， 其中定义了操作net_device的重要函数，我们在驱动程序中根据需要的操作要填充这些函数。

3、dm9000_ethtool_ops

static const struct ethtool_ops dm9000_ethtool_ops = {

.get_drvinfo = dm9000_get_drvinfo,

.get_settings = dm9000_get_settings,

.set_settings = dm9000_set_settings,

.get_msglevel = dm9000_get_msglevel,

.set_msglevel = dm9000_set_msglevel,

.nway_reset = dm9000_nway_reset,

.get_link = dm9000_get_link,

  .get_eeprom_len = dm9000_get_eeprom_len,

  .get_eeprom = dm9000_get_eeprom,

  .set_eeprom = dm9000_set_eeprom,

.get_rx_csum = dm9000_get_rx_csum,

.set_rx_csum = dm9000_set_rx_csum,

.get_tx_csum = ethtool_op_get_tx_csum,

.set_tx_csum = dm9000_set_tx_csum,

};

dm9000_ethtool_ops是ethtool_ops结构体变量，为了支持ethtool，其中的函数主要是用于查询和设置网卡参数（当然也有的驱动程序可能不支持ethtool）。

4.board_info

/* Structure/enum declaration ------------------------------- */

typedef struct board_info {

void __iomem *io_addr; /* Register I/O base address */

void __iomem *io_data; /* Data I/O address */

u16 irq; /* IRQ */

u16 tx_pkt_cnt;

u16 queue_pkt_len;

u16 queue_start_addr;

u16 queue_ip_summed;

u16 dbug_cnt;

u8 io_mode; /* 0:word, 2:byte */

u8 phy_addr;

u8 imr_all;

unsigned int flags;

unsigned int in_suspend :1;

int debug_level;

enum dm9000_type type;

void (*inblk)(void __iomem *port, void *data, int length);

void (*outblk)(void __iomem *port, void *data, int length);

void (*dumpblk)(void __iomem *port, int length);

struct device *dev;      /* parent device */

struct resource *addr_res;   /* resources found */

struct resource *data_res;

struct resource *addr_req;   /* resources requested */

struct resource *data_req;

struct resource *irq_res;

struct mutex addr_lock; /* phy and eeprom access lock */

struct delayed_work phy_poll;

struct net_device  *ndev;

spinlock_t lock;

struct mii_if_info mii;

u32 msg_enable;

int rx_csum;

int can_csum;

int ip_summed;

} board_info_t;

board_info结构体用来保存芯片相关的一些私有信息。具体在代码中分析。