dm9000的驱动分析
m9000_init
platform_driver_register( &dm9000_driver);
dm9000_probe
/*获取平台数据*/
struct dm9000_plat_data *pdata = pdev - >dev.platform_data;
/*表示一个网络设备*/
struct net_device *ndev;
/*为网络设备分配空间*/
ndev = alloc_etherdev( sizeof( struct board_info));
/*获取资源*/
db - >addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
db - >data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
db - >irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
/*映射地址端口*/
db - >io_addr = ioremap(db - >addr_res - >start, iosize);
/*映射数据端口*/
db - >io_data = ioremap(db - >data_res - >start, iosize);
/*硬件相关的操作*/
/*1.设置读写操作函数*/
dm9000_set_io(db, 2);
case 2 :
db - >dumpblk = dm9000_dumpblk_16bit;
db - >outblk = dm9000_outblk_16bit;
db - >inblk = dm9000_inblk_16bit;
break;
/*2.复位 */
dm9000_reset(db);
/*3.读dm9000的ID号 */
id_val = ior(db, DM9000_VIDL);
id_val |= (u32)ior(db, DM9000_VIDH) << 8;
id_val |= (u32)ior(db, DM9000_PIDL) << 16;
id_val |= (u32)ior(db, DM9000_PIDH) << 24;
/* 获取芯片型号 */
id_val = ior(db, DM9000_CHIPR);
ether_setup(ndev);
/*设置操作方法*/
ndev - >netdev_ops = &dm9000_netdev_ops;
/*注册网络设备*/
register_netdev(ndev); //register_chrdev
platform_driver_register( &dm9000_driver);
dm9000_probe
/*获取平台数据*/
struct dm9000_plat_data *pdata = pdev - >dev.platform_data;
/*表示一个网络设备*/
struct net_device *ndev;
/*为网络设备分配空间*/
ndev = alloc_etherdev( sizeof( struct board_info));
/*获取资源*/
db - >addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
db - >data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
db - >irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
/*映射地址端口*/
db - >io_addr = ioremap(db - >addr_res - >start, iosize);
/*映射数据端口*/
db - >io_data = ioremap(db - >data_res - >start, iosize);
/*硬件相关的操作*/
/*1.设置读写操作函数*/
dm9000_set_io(db, 2);
case 2 :
db - >dumpblk = dm9000_dumpblk_16bit;
db - >outblk = dm9000_outblk_16bit;
db - >inblk = dm9000_inblk_16bit;
break;
/*2.复位 */
dm9000_reset(db);
/*3.读dm9000的ID号 */
id_val = ior(db, DM9000_VIDL);
id_val |= (u32)ior(db, DM9000_VIDH) << 8;
id_val |= (u32)ior(db, DM9000_PIDL) << 16;
id_val |= (u32)ior(db, DM9000_PIDH) << 24;
/* 获取芯片型号 */
id_val = ior(db, DM9000_CHIPR);
ether_setup(ndev);
/*设置操作方法*/
ndev - >netdev_ops = &dm9000_netdev_ops;
/*注册网络设备*/
register_netdev(ndev); //register_chrdev
cs8900a网卡驱动分析
/*分配一个网络设备*/
struct net_device *dev = alloc_etherdev( sizeof( struct net_local));
dev - >irq = irq;
dev - >base_addr = io;
cs89x0_probe1(dev, io, 1);
/*识别芯片*/
/*操作方法的设置*/
dev - >netdev_ops = &net_ops;
/*注册网络设备*/
register_netdev(dev);
static const struct net_device_ops dm9000_netdev_ops = {
.ndo_open = dm9000_open, //必须的
.ndo_stop = dm9000_stop, //必须的
.ndo_start_xmit = dm9000_start_xmit, //必须的
.ndo_tx_timeout = dm9000_timeout, //必须的
.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
};
struct net_device *dev = alloc_etherdev( sizeof( struct net_local));
dev - >irq = irq;
dev - >base_addr = io;
cs89x0_probe1(dev, io, 1);
/*识别芯片*/
/*操作方法的设置*/
dev - >netdev_ops = &net_ops;
/*注册网络设备*/
register_netdev(dev);
static const struct net_device_ops dm9000_netdev_ops = {
.ndo_open = dm9000_open, //必须的
.ndo_stop = dm9000_stop, //必须的
.ndo_start_xmit = dm9000_start_xmit, //必须的
.ndo_tx_timeout = dm9000_timeout, //必须的
.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
};
网卡驱动的数据接收发送流程?
初始化设备
dm9000_open(
struct net_device
*dev)
{
if (request_irq(dev - >irq, dm9000_interrupt, irqflags, dev - >name, dev))
return -EAGAIN;
/* Initialize DM9000 board */
dm9000_reset(db);
/* RESET device */
writeb(DM9000_NCR, db - >io_addr);
udelay( 200);
writeb(NCR_RST, db - >io_data);
udelay( 200);
/* dm9000的初始化,芯片厂商会支持 */
dm9000_init_dm9000(dev);
/* 启动发送队列 */
netif_start_queue(dev);
}
{
if (request_irq(dev - >irq, dm9000_interrupt, irqflags, dev - >name, dev))
return -EAGAIN;
/* Initialize DM9000 board */
dm9000_reset(db);
/* RESET device */
writeb(DM9000_NCR, db - >io_addr);
udelay( 200);
writeb(NCR_RST, db - >io_data);
udelay( 200);
/* dm9000的初始化,芯片厂商会支持 */
dm9000_init_dm9000(dev);
/* 启动发送队列 */
netif_start_queue(dev);
}
数据接收流程
dm9000_interrupt(
int irq,
void
*dev_id)
/* Save previous register address */
reg_save = readb(db - >io_addr);
/* Disable all interrupts */
iow(db, DM9000_IMR, IMR_PAR);
/* Got DM9000 interrupt status */
int_status = ior(db, DM9000_ISR); /* Got ISR */
iow(db, DM9000_ISR, int_status); /* Clear ISR status */
/* Received the coming packet 读中断*/
if (int_status & ISR_PRS)
dm9000_rx(dev);
ior(db, DM9000_MRCMDX); /* Dummy read 地址不自动增加*/
rxbyte = readb(db - >io_data);
if (rxbyte & DM9000_PKT_ERR) {
dev_warn(db - >dev, "status check fail: %d\n", rxbyte);
iow(db, DM9000_RCR, 0x00); /* Stop Device */
iow(db, DM9000_ISR, IMR_PAR); /* Stop INT request */
return;
}
writeb(DM9000_MRCMD, db - >io_addr); /*地址自动增加的*/
/* 读取状态信息 */
(db - >inblk)(db - >io_data, &rxhdr, sizeof(rxhdr)); //dm9000_inblk_16bit
RxLen = le16_to_cpu(rxhdr.RxLen);
/*数据的状态判断*/
if (rxhdr.RxStatus & (RSR_FOE | RSR_CE | RSR_AE |
RSR_PLE | RSR_RWTO |
RSR_LCS | RSR_RF)) {
struct sk_buff *skb;
skb = dev_alloc_skb(RxLen + 4)) /*分配一个sk_buff数据包*/
skb_reserve(skb, 2); //data指针和tail指针同时下移
rdptr = (u8 *) skb_put(skb, RxLen - 4);
(db - >inblk)(db - >io_data, rdptr, RxLen); //dm9000_inblk_16bit //读真正的有效数据(MAC头,TCP头,IP头,网络数据)
dev - >stats.rx_bytes += RxLen;
/* Pass to upper layer,去掉MAC头 */
skb - >protocol = eth_type_trans(skb, dev);
/* 将数据上报到上层 */
netif_rx(skb);
dev - >stats.rx_packets ++;
/* Save previous register address */
reg_save = readb(db - >io_addr);
/* Disable all interrupts */
iow(db, DM9000_IMR, IMR_PAR);
/* Got DM9000 interrupt status */
int_status = ior(db, DM9000_ISR); /* Got ISR */
iow(db, DM9000_ISR, int_status); /* Clear ISR status */
/* Received the coming packet 读中断*/
if (int_status & ISR_PRS)
dm9000_rx(dev);
ior(db, DM9000_MRCMDX); /* Dummy read 地址不自动增加*/
rxbyte = readb(db - >io_data);
if (rxbyte & DM9000_PKT_ERR) {
dev_warn(db - >dev, "status check fail: %d\n", rxbyte);
iow(db, DM9000_RCR, 0x00); /* Stop Device */
iow(db, DM9000_ISR, IMR_PAR); /* Stop INT request */
return;
}
writeb(DM9000_MRCMD, db - >io_addr); /*地址自动增加的*/
/* 读取状态信息 */
(db - >inblk)(db - >io_data, &rxhdr, sizeof(rxhdr)); //dm9000_inblk_16bit
RxLen = le16_to_cpu(rxhdr.RxLen);
/*数据的状态判断*/
if (rxhdr.RxStatus & (RSR_FOE | RSR_CE | RSR_AE |
RSR_PLE | RSR_RWTO |
RSR_LCS | RSR_RF)) {
struct sk_buff *skb;
skb = dev_alloc_skb(RxLen + 4)) /*分配一个sk_buff数据包*/
skb_reserve(skb, 2); //data指针和tail指针同时下移
rdptr = (u8 *) skb_put(skb, RxLen - 4);
(db - >inblk)(db - >io_data, rdptr, RxLen); //dm9000_inblk_16bit //读真正的有效数据(MAC头,TCP头,IP头,网络数据)
dev - >stats.rx_bytes += RxLen;
/* Pass to upper layer,去掉MAC头 */
skb - >protocol = eth_type_trans(skb, dev);
/* 将数据上报到上层 */
netif_rx(skb);
dev - >stats.rx_packets ++;
数据发送流程
sk_buff
dm9000_start_xmit
/* 将数据写入到DM9000的SRAM中 */
/* Move data to DM9000 TX RAM */
writeb(DM9000_MWCMD, db - >io_addr); //设置为自动增加
//dm9000_outblk_16bit
(db - >outblk)(db - >io_data, skb - >data, skb - >len); //dm9000_outblk_16bit
dev - >stats.tx_bytes += skb - >len;
db - >tx_pkt_cnt ++;
/*设置发送属性*/
dm9000_send_packet( struct net_device *dev,
int ip_summed,
u16 pkt_len)
/*指定数据包的长度*/
iow(dm, DM9000_TXPLL, pkt_len);
iow(dm, DM9000_TXPLH, pkt_len >> 8);
/*启动发送:数据发送完成,产生中断*/
iow(dm, DM9000_TCR, TCR_TXREQ); /* Cleared after TX complete */
netif_stop_queue(dev);
dm9000_interrupt( int irq, void *dev_id)
/* Save previous register address */
reg_save = readb(db - >io_addr); //让他不自动增加
/* 关中断 */
iow(db, DM9000_IMR, IMR_PAR);
/*获取中断状态*/
int_status = ior(db, DM9000_ISR); /* Got ISR */
iow(db, DM9000_ISR, int_status); /* Clear ISR status */
/* Trnasmit Interrupt check,数据发送完成 */
if (int_status & ISR_PTS)
dm9000_tx_done(dev, db);
db - >tx_pkt_cnt --;
dev - >stats.tx_packets ++;
if (db - >tx_pkt_cnt > 0)
dm9000_send_packet(dev, db - >queue_ip_summed,db - >queue_pkt_len);
/*指定数据包的长度*/
iow(dm, DM9000_TXPLL, pkt_len);
iow(dm, DM9000_TXPLH, pkt_len >> 8);
/*启动发送:数据发送完成,产生中断*/
iow(dm, DM9000_TCR, TCR_TXREQ); /* Cleared after TX complete */
netif_wake_queue(dev);
/* Re-enable interrupt mask */
iow(db, DM9000_IMR, db - >imr_all);
/* Restore previous register address */
writeb(reg_save, db - >io_addr); //恢复为自动增加
dm9000_start_xmit
/* 将数据写入到DM9000的SRAM中 */
/* Move data to DM9000 TX RAM */
writeb(DM9000_MWCMD, db - >io_addr); //设置为自动增加
//dm9000_outblk_16bit
(db - >outblk)(db - >io_data, skb - >data, skb - >len); //dm9000_outblk_16bit
dev - >stats.tx_bytes += skb - >len;
db - >tx_pkt_cnt ++;
/*设置发送属性*/
dm9000_send_packet( struct net_device *dev,
int ip_summed,
u16 pkt_len)
/*指定数据包的长度*/
iow(dm, DM9000_TXPLL, pkt_len);
iow(dm, DM9000_TXPLH, pkt_len >> 8);
/*启动发送:数据发送完成,产生中断*/
iow(dm, DM9000_TCR, TCR_TXREQ); /* Cleared after TX complete */
netif_stop_queue(dev);
dm9000_interrupt( int irq, void *dev_id)
/* Save previous register address */
reg_save = readb(db - >io_addr); //让他不自动增加
/* 关中断 */
iow(db, DM9000_IMR, IMR_PAR);
/*获取中断状态*/
int_status = ior(db, DM9000_ISR); /* Got ISR */
iow(db, DM9000_ISR, int_status); /* Clear ISR status */
/* Trnasmit Interrupt check,数据发送完成 */
if (int_status & ISR_PTS)
dm9000_tx_done(dev, db);
db - >tx_pkt_cnt --;
dev - >stats.tx_packets ++;
if (db - >tx_pkt_cnt > 0)
dm9000_send_packet(dev, db - >queue_ip_summed,db - >queue_pkt_len);
/*指定数据包的长度*/
iow(dm, DM9000_TXPLL, pkt_len);
iow(dm, DM9000_TXPLH, pkt_len >> 8);
/*启动发送:数据发送完成,产生中断*/
iow(dm, DM9000_TCR, TCR_TXREQ); /* Cleared after TX complete */
netif_wake_queue(dev);
/* Re-enable interrupt mask */
iow(db, DM9000_IMR, db - >imr_all);
/* Restore previous register address */
writeb(reg_save, db - >io_addr); //恢复为自动增加
怎么写网卡驱动
1.cs89x0.c
1.1 分配一个net_device结构体
alloc_etherdev
1.2 设置
dev
-
>open
= net_open;
dev - >stop = net_close;
dev - >tx_timeout = net_timeout;
dev - >watchdog_timeo = HZ;
dev - >hard_start_xmit = net_send_packet;
dev - >get_stats = net_get_stats;
dev - >set_multicast_list = set_multicast_list;
dev - >set_mac_address = set_mac_address;
dev - >stop = net_close;
dev - >tx_timeout = net_timeout;
dev - >watchdog_timeo = HZ;
dev - >hard_start_xmit = net_send_packet;
dev - >get_stats = net_get_stats;
dev - >set_multicast_list = set_multicast_list;
dev - >set_mac_address = set_mac_address;
1.3 注册
register_netdev
2. DM9000.c
2.1 分配一个net_device结构体
ndev = alloc_etherdev(sizeof (struct board_info));
2.2 设置
ether_setup(ndev);
ndev - >open = &dm9000_open;
ndev - >hard_start_xmit = &dm9000_start_xmit;
ndev - >tx_timeout = &dm9000_timeout;
ndev - >watchdog_timeo = msecs_to_jiffies(watchdog);
ndev - >stop = &dm9000_stop;
ndev - >get_stats = &dm9000_get_stats;
ndev - >set_multicast_list = &dm9000_hash_table;
ndev - >open = &dm9000_open;
ndev - >hard_start_xmit = &dm9000_start_xmit;
ndev - >tx_timeout = &dm9000_timeout;
ndev - >watchdog_timeo = msecs_to_jiffies(watchdog);
ndev - >stop = &dm9000_stop;
ndev - >get_stats = &dm9000_get_stats;
ndev - >set_multicast_list = &dm9000_hash_table;
2.3 注册
ret = register_netdev(ndev);
任何设备的核心都是收发数据
1. 发数据：
上层要发送数据时，构造一个sk_buff，然后调用net_device的hard_start_xmit来发送
2. 收数据：
网卡收到数据后，发生中断
在中断服务程序里：
从硬件上读出数据，然后构造一个sk_buff，上报：
a. 分配一个sk_buff结构体:
dev_alloc_skb
b. 使用硬件上得到数据填充这个结构体
c. 上报：netif_rx
测试方法
1. 编译/安装驱动 farsight_net_1.c
ifconfig fs_net0 up
ifconfig fs_net0 192. 188. 1. 1
ping 192. 188. 1. 1 成功,证明ping自己的话，不经过硬件
ping 192. 188. 1. 2 多次调用fsnet_hard_start_tx
PING 192. 188. 1. 2 ( 192. 188. 1. 2) : 56 data bytes
fsnet_hard_start_tx
fsnet_hard_start_tx
再次ifconfig发现fs_net0的rx/tx都是0
ifconfig fs_net0 192. 188. 1. 1
ping 192. 188. 1. 1 成功,证明ping自己的话，不经过硬件
ping 192. 188. 1. 2 多次调用fsnet_hard_start_tx
PING 192. 188. 1. 2 ( 192. 188. 1. 2) : 56 data bytes
fsnet_hard_start_tx
fsnet_hard_start_tx
再次ifconfig发现fs_net0的rx/tx都是0
2. 编译/安装驱动 farsight_net_2.c: 添加统计信息
3. 编译/安装驱动 farsight_net_3.c: 设MAC地址
ifconfig fs_net0
ifconfig 可以看到MAC地址
4. 编译/安装驱动 farsight_net_4.c: 构造ping的返回包
ifconfig fs_net0 up
ifconfig fs_net0 192.188.1.1
ping 192.188.1.2 成功
怎么移植网卡驱动
网卡基本上都是内存接口(ram-like)
1. 根据原理图确定访问地址, 在驱动里修改相应项
2. 为了能通过这些地址访问网卡，对于2410还要设置memory controller
比如设置位宽、时间参数
3. 根据原理图确定中断号, 在驱动里修改相应项(包括中断号、中断触发方式(高/低有效))
@成鹏致远
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