void cs8900_recv(struct net_device *dev)
{
volatile u16 status, length;
struct sk_buff *skb;
status = cs8900_read(dev, PP_RxStatus);
length = cs8900_read(dev, PP_RxLength);
if(!(status & RxOK))
{
return;
}
skb = dev_alloc_skb(length + 2);
if(!skb)
{
//printk("alloc skb error!\n");
return;
}
skb_reserve(skb, 2);
skb->dev = dev;
cs8900_frame_read(dev, skb, length);
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
return;
}
irqreturn_t cs8900_interrupt(int irq, void *dev_id)
{
volatile u16 status;
struct net_device *dev = (struct net_device *)dev_id;
while((status = cs8900_read(dev, PP_ISQ)) != 0)
{
switch(RegNum(status))
{
case RxEvent:
cs8900_recv(dev); //接收数据
break;
case TxEvent:
netif_wake_queue(dev);
break;
case BufEvent: //既有接收中断事件，又有发送中断事件
if(((RegContent(status)) & TxUnderrun))
{
netif_wake_queue(dev);
}
break;
}
}
return IRQ_HANDLED;
}
int cs8900_xmit(struct sk_buff *skb, struct net_device *dev)
{
volatile u16 status;
spin_lock_irq(&mylock);
netif_stop_queue(dev);
cs8900_write(dev, PP_TxCMD, TxStart(After5));
cs8900_write(dev, PP_TxLength, skb->len);
status = cs8900_read(dev, PP_BusST);
if((status & TxBidErr))
{
spin_unlock_irq(&mylock);
printk("invalid data length!\n");
return 0;
}
if(!(status & Rdy4TxNOW))
{
spin_unlock_irq(&mylock);
printk("tx buffer is not free!\n");
return 0;
}
cs8900_frame_write(dev, skb);
spin_unlock_irq(&mylock);
dev_kfree_skb(skb);
return 0;
}
/* ----- read byte from I/O range in VICE ----- */
BYTE cs8900io_read(WORD io_address)
{
if (!cs8900io_cannot_use) {
return cs8900_read(io_address);
}
return 0;
}
/* ----- read byte from I/O range in VICE ----- */
static BYTE tfe_read(WORD io_address)
{
if (tfe_as_rr_net) {
/* rr status register is handled by rr cartidge */
if (io_address < 0x02) {
return 0;
}
io_address ^= 0x08;
}
tfe_current_device->io_source_valid = 1;
return cs8900_read(io_address);
}
int cs8900_init(struct net_device *dev)
{
int i;
dev->open = cs8900_open;
dev->stop = cs8900_stop;
dev->hard_start_xmit = cs8900_xmit;
ether_setup(dev);
//协议栈用的MAC地址
dev->dev_addr[0] = 0x08;
dev->dev_addr[1] = 0x00;
dev->dev_addr[2] = 0x3e;
dev->dev_addr[3] = 0x26;
dev->dev_addr[4] = 0x0a;
dev->dev_addr[5] = 0x5b;
dev->if_port = IF_PORT_10BASET; //RJ45
dev->irq = IRQ_EINT9;
dev->base_addr = (unsigned long)ioremap(0x19000000, 16);
//检测是否是cs8900a网卡芯片
if(cs8900_read(dev, PP_ProductID) != 0x630E)
{
printk("this is not a CS8900A chip!\n");
return -1;
}
//cs8900网卡芯片端使用的是INTRQ0管脚连接了s3c2440芯片的EINT9中断管脚
cs8900_write(dev, PP_IntNum, 0);
for(i = 0; i < 6; i += 2)
{
cs8900_write(dev, PP_IA + i,
(dev->dev_addr[i+1]<<8) | dev->dev_addr[i]);
}
return 0;
}
static inline void cs8900_set(struct net_device *dev, u16 regno, u16 value)
{
cs8900_write(dev, regno, cs8900_read(dev, regno) | value);
}
