第3天网卡触摸屏dm9000驱动分析

该资料归属国嵌（简称“国嵌”）所有,并保留。非经国嵌同意(录本手册部分或全部，违者追 CS8900A驱动（国嵌00d3H10BASE-T，并使能设备RXCFG控制CS8900接收到特定数据报后会接收中断。CS8900会产生一个接收中断。BUSCT可控制的I/O接口的一些操作。设置初始值ISQ是网卡的中断状态寄存器，内部映射接收中断状态然后将数据通过PORT0写入。系统工作时，应首先对网卡进行初始化，即写寄存TXCMD，并将发送数据长度写入TXLENG，然后将数据依次写入PORT0口，网卡将数据组织为链路层类型并添加填充位和CRC校验送到网络。模块static init{structnet_local*lp;intret=0;dev_cs89x0.irq=irq;dev_cs89x0.base_addr=io;dev_cs89x0.init=cs89x0_probe;NETCARD_IO_EXTENT,"cs8900a");if(register_netdev(&dev_cs89x0)!=}static initcs89x0_probe1(structnet_device*dev,int{/*getthechiptyperev_type=readreg(dev,PRODUCT_ID_ADD);lp->chip_type=rev_type&~REVISON_BITS;lp->chip_revision=((rev_type&REVISON_BITS)>>8)+if(lp->chip_type!={ ":wrongdevicedriver!\n");ret=-ENODEV;goto}dev->dev_addr[0]=0x00;dev->dev_addr[1]=0x00;dev->dev_addr[2]=0xc0;dev->dev_addr[3]=0xff;dev->dev_addr[4]=0xee;dev->dev_addr[5]=0x08;set_mac_address(dev,dev-dev->irq=IRQ_LAN;printk(",IRQ%d",dev->irq);dev- =dev- = =net_timeout;dev->watchdog_timeo=3*HZ;dev->hard_start_xmit=net_send_packet; =net_get_stats;dev->set_multicast_list=set_multicast_list; =set_mac_address;/*Fillinthefieldsofthedevicestructurewithethernetvalues.}staticintnet_send_packet(structsk_buff*skb,structnet_device{/*initiateatransmitsequencewriteword(dev,TX_LEN_PORT,skb->len);/*Testtoseeifthechiphasallocatedmemoryforthepacket*/if((readreg(dev,PP_BusST)&READY_FOR_TX_NOW)==0){spin_unlock_irq(&lp-DPRINTK(1,"cs89x0:Txbuffernot return1;}/*Writethecontentsofthepacketwriteblock(dev,skb->data,skb-return}中staticvoidnet_interrupt(intirq,void*dev_id,structpt_regs*{while((status=readword(dev,{switch(status&{case/*Gotapacket(s).*/caselp- /*Informupperlayers.*/}接staticvoidnet_rx(structnet_device*dev)status=inw(ioaddr+RX_FRAME_PORT);if((status&RX_OK)==0){count_rx_errors(status,}length=inw(ioaddr+/*Mallocupnewbuffer.skb=dev_alloc_skb(length+if(skb==NULL)lp-}skb_reserve(skb, mac头是14个字节，一开始保留两个字节，正是为了保证ip头skb->len=length;skb->dev=dev;readblock(dev,skb->data,skb-skb-}该资料归属国嵌（简称“国嵌”）所有,并保留。非经国嵌同意(录本手册部分或全部，违者追 DM9000驱动程序分static init{ CARDNAME,DRV_VERSION);return}staticstructtform_driverdm9000_driver=.driver= =.owner= = .suspend= =static dm9000_probe(structtform_device{structdm9000_t_data*pdata=pdev->dev.tform_data;structboard_info*db; /*Pointaboardinformationstructure*/structnet_device*ndev;constunsignedchar*mac_src;intret=0;intiosize;inti;u32/*Initnetworkdevicendev=alloc_etherdev(sizeof(structif(!ndev)dev_err(&pdev->dev,"couldnotallocatereturn-} &pdev-dev_dbg(&pdev->dev,/*setupboardinfostructure*/db=netdev_priv(ndev);memset(db,0,sizeof(*db));db->dev=&pdev->dev;db->ndev=ndev;INIT_DELAYED_WORK(&db- db->addr_res=tform_get_resource(pdev,IORESOURCE_MEM,db->data_res=tform_get_resource(pdev,IORESOURCE_MEM, =tform_get_resource(pdev,IORESOURCE_IRQ,if(db->addr_res==NULL||db->data_res==NULL||db->irq_res==NULL){ret=-ENOENT;goto}iosize=res_size(db- pdev-if(db->addr_req==NULL)dev_err(db->dev,"cannotclaimaddressregarea\n");ret=-EIO;goto}if(db->io_addr==NULL)dev_err(db->dev,"failedtoioremapaddressreg\n");ret=-EINVAL;goto}iosize=res_size(db-db->data_req=request_mem_region(db->data_res->start,iosize,if(db->data_req==NULL)dev_err(db->dev,"cannotclaimdataregret=-goto}db->io_data=ioremap(db->data_res->start,if(db->io_data==NULL)dev_err(db->dev,"failedtoioremapdatareg\n");ret=-EINVAL;goto}/*fillinparametersfornet-devstructure*/ndev->base_addr=(unsignedlong)db->io_addr;ndev->irq=db->irq_res->start;/*ensureatleastwehaveadefaultsetofIOroutines*/dm9000_set_io(db,iosize);/*checktoseeifanythingisbeingover-riddenif(pdata!=NULL)/*checktoseeifthedriverwantstoover-ride*defaultIOwidthdm9000_set_io(db,1);dm9000_set_io(db,2);dm9000_set_io(db,4);/*checktoseeifthereareanyIO*over-ridesif(pdata->inblk!=db->inblk=pdata-if(pdata->outblk!=db->outblk=pdata-if(pdata->dumpblk!=db->dumpblk=pdata-db->flags=pdata-}#ifdefCONFIG_DM9000_/*trymultipletimes,DM9000sometimesgetsthereadwrong*/for(i=0;i<8;i++){id_val=ior(db,id_val|=(u32)ior(db,DM9000_VIDH)<<8;id_val|=(u32)ior(db,DM9000_PIDL)<<16;id_val|=(u32)ior(db,DM9000_PIDH)<<24;if(id_val==DM9000_ID)dev_err(db->dev,"readwrongid0x%08x\n",}if(id_val!=DM9000_ID)dev_err(db->dev,"wrongid:0x%08x\n",id_val);ret=-ENODEV;goto}/*IdentifywhattypeofDM9000weareworkingonid_val=ior(db,dev_dbg(db->dev,"dm9000revision0x%02x\n",switch(id_val)casedb->type=casedb->type=TYPE_DM9000B;dev_dbg(db->dev,"ID%02x=>defaultingtoDM9000E\n",db->type=}/*fromthispointweassumethatwehavefoundaDM9000/*driversystemfunction*/ndev- = =&dm9000_start_xmit; =&dm9000_timeout;ndev->watchdog_timeo=msecs_to_jiffies(watchdog); =&dm9000_stop; =&dm9000_ethtool_ops; =&dm9000_ioctl;#ifdef =NETIF_MSG_LINK; =0x1f;db->mii.reg_num_mask=0x1f; =0; =0;db- = =dm9000_phy_read;db- =mac_src=/*tryreadingthenodeaddressfromtheattachedEEPROMfor(i=0;i<6;i+=dm9000_read_eeprom(db,i/2,ndev-if(!is_valid_ether_addr(ndev->dev_addr)&&pdata!={mac_src="tformmemcpy(ndev->dev_addr,pdata->dev_addr,}if(!is_valid_ether_addr(ndev->dev_addr))/*tryreadingfrommacmac_src="chip";for(i=0;i<6;i++)ndev->dev_addr[i]=ior(db,} (!is_valid_ether_addr(ndev-dev_warn(db- Please"setusingifconfig\n",ndev-tform_set_drvdata(pdev,ret=if(ret==printk(KERN_INFO"%s:dm9000%cat%p,%pIRQ%dMAC:%pM(%s)\n",ndev->name,dm9000_type_to_char(db->type),db->io_addr,db->io_data,ndev->irq,ndev->dev_addr,returndev_err(db->dev,"notfound(%d).\n",dm9000_release_board(pdev,return}staticintdm9000_open(structnet_device{board_info_t*db= ifdev_dbg(db->dev,"enabling%s\n",dev-/*IfthereisnoIRQtypespecified,defaulttosomething*maywork, ltheuserthatthisisaproblemif(irqflags== irqflags|= dev->name,dev))return-/*InitializeDM9000board*//*Initdrivervariable*/ t=0;mii_check_media(&db->mii,netif_msg_link(db),1);return}staticintdm9000_start_xmit(structsk_buff*skb,struct{unsignedlongboard_info_t*db=dm9000_dbg(db,3, if(db-> t>1)return1;spin_lock_irqsave(&db- /*MovedatatoDM9000TXRAM*/writeb(DM9000_MWCMD,db->io_addr);(db->outblk)(db->io_data,skb->data,skb->len);dev->stats.tx_bytes+=skb->len;db- /*TXcontrol:Firstpacketimmedia ysend,secondpacketqueue*/if(db-> t==1){/*SetTXlengthtoDM9000*/iow(db,DM9000_TXPLL,skb->len);iow(db,DM9000_TXPLH,skb->len>>/*IssueTXpollingcommandiow(db,DM9000_TCR,TCR_TXREQ); complete*/dev->trans_start= /*savethetimestamp}else/*Secondpacketdb->queue_pkt_len=skb->len;}spin_unlock_irqrestore(&db- thisSKB*/return}staticirqreturn_tdm9000_interrupt(intirq,void{structnet_device*dev=dev_id;board_info_t*db=netdev_priv(dev);intint_status;unsignedlongflags;u8reg_save;dm9000_dbg(db,3,"entering /*Arealinterruptcoming/*holdersofdb->lockmustalwaysblockIRQs*/spin_lock_irqsave(&db->lock,flags);/*Savepreviousregisteraddress*/reg_save=readb(db->io_addr);/*Disableallinterruptsiow(db,DM9000_IMR,/*GotDM9000interruptstatusint_status=ior(db,DM9000_ISR);/*GotISRiow(db,DM9000_ISR,int_status);/*ClearISRstatusifdev_dbg(db->dev,"interruptstatus%02x\n",/*Receivedthecomingpacket*/if(int_status&ISR_PRS)/*TrnasmitInterruptcheck*/if(int_status&ISR_PTS)dm9000_tx_done(dev,if(db->type!=TYPE_DM9000E)if(int_status&ISR_LNKCHNG)/*firealink-changerequest*/schedule_delayed_work(&db->phy_poll,1);}}/*Re-enableinterruptmask*/iow(db,DM9000_IMR,db->imr_all);/*Restorepreviousregisteraddresswriteb(reg_save,db-spin_unlock_irqrestore(&db- return}staticdm9000_rx(structnet_device{board_info_t*db=netdev_priv(dev);structdm9000_rxhdrrxhdr;structsk_buff*skb;u8rxbyte,*rdptr;boolGoodPacket;intRxLen;/*Checkpacketreadyornot*/do{ior(db, /*Dummyread/*Getmostupdateddata*/rxbyte=readb(db->io_data);/*Statuscheck:thisbytemustbe0or1*/if(rxbyte>DM9000_PKT_RDY){dev_warn(db->dev,"statuscheckfail:%d\n",rxbyte);iow(db,DM9000_RCR,0x00);/*StopDevice*/iow(db,DM9000_ISR,IMR_PAR);/*StopINTrequest}if(rxbyte!=DM9000_PKT_RDY)/*Apacketreadynow &Getstatus/length*/GoodPacket=true;writeb(DM9000_MRCMD,db->io_a