pci设备(网卡)初始化代码分析.htm

Drew对于BSP的相关配置的一些经验和总结。压缩文件里包含了3个HTML文件:BSP配置文件及生成下载、VxWorks BSP和启动过程、PCI设备(网卡)初始化代码分析。希望对大家有所帮助。

      BusDevFunc = (busNum &lt;&lt; 16) | (Device &lt;&lt; 11);</p> 
      <p><strong>//如果Device存在<br> 
      </strong>if (pciConfigIn(BusDevFunc, PCI_CFG_VENDOR_ID,2) != 0xFFFF) <br> 
      {<br> 
      #ifdef PCIDEBUG<br> 
      printf(&quot;* * * * * * * * * * * * * * * * *\n&quot;);<br> 
      printf(&quot;Device %d is present\n&quot;,Device);<br> 
      #endif<br> 
      switch( pciConfigIn(BusDevFunc, PCI_CFG_SUBCLASS, 2) )<br> 
      {<br> 
      <br> 
      case 0x0604:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <strong>/* PCI-PCI  
      Bridge */</strong><br> 
      break;<br> 
      <br> 
      default:<br> 
      pciDumpDevice(BusDevFunc);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <strong>//打印  
      Vendor ID, Device ID</strong></p> 
    </blockquote> 
  </blockquote> 
</blockquote> 
 
<blockquote> 
  <p><strong>//调用pciConfigDevice(BusDevFunc, 6)对PCI设备进行设置<br> 
  </strong></p> 
  <blockquote> 
    <blockquote> 
      <p>pciConfigDevice(BusDevFunc, 6);<br> 
      }<br> 
      }<br> 
      else<br> 
      {<br> 
      #ifdef PCIDEBUG<br> 
      printf(&quot;Device %d not present\n&quot;,Device);<br> 
      #endif<br> 
      }<br> 
      }<br> 
      }</p> 
    </blockquote> 
  </blockquote> 
</blockquote> 
 
<p><strong>//pciConfigDevice - 为PCI设备配置内存和I/O方式</strong></p> 
 
<blockquote> 
  <blockquote> 
    <blockquote> 
      <p>void pciConfigDevice(int BusDevFunc,int NumBaseAddr)<br> 
      {<br> 
      int AddrSlot;<br> 
      int i;<br> 
      unsigned long AddrDesc;<br> 
      unsigned long AddrProg;<br> 
      unsigned long Min_Gnt_Val;<br> 
      </p> 
      <p><strong>// NumBaseAddr = 6<br> 
      </strong>for (AddrSlot = 0; AddrSlot &lt; NumBaseAddr; AddrSlot++)<br> 
      {</p> 
      <p><strong>// PCI_CFG_BASE_ADDRESS_0 = 0x10 将0xFFFFFFFF写入 &nbsp;  
      PCI_CFG_BASE_ADDRESS_0 + (4*AddrSlot)<br> 
      </strong>pciConfigOut(BusDevFunc, PCI_CFG_BASE_ADDRESS_0 + (4*AddrSlot),<br> 
      0xFFFFFFFF, 4);</p> 
      <p><strong>// 从PCI_CFG_BASE_ADDRESS_0 + (4*AddrSlot)读出数据<br> 
      </strong>AddrDesc = pciConfigIn(BusDevFunc,<br> 
      PCI_CFG_BASE_ADDRESS_0 + (4*AddrSlot),<br> 
      4);<br> 
      </p> 
      <p><strong>// 如果数据是0,没有PCI设备,继续循环搜索<br> 
      </strong>if (AddrDesc == 0) /* unimplemented, stop looking */<br> 
      continue;<br> 
      <br> 
      #ifdef PCIDEBUG<br> 
      printf(&quot;Read Base Addr Reg %d = 0x%08x\n&quot;,AddrSlot,AddrDesc);<br> 
      #endif<br> 
      <strong>/* 如果AddrDesc的位0是0,表示是Mem方式 */</strong><br> 
      if ((AddrDesc &amp; 1) == 0) <br> 
      {<br> 
      AddrDesc &amp;= 0xFFFFFFF0;<br> 
      <br> 
      for (i = 0; (AddrDesc &amp; 1) != 1; i++)&nbsp;&nbsp;&nbsp; <strong>//查询Mem的大小</strong><br> 
      AddrDesc = AddrDesc &gt;&gt; 1;<br> 
      <br> 
      AddrDesc = 1 &lt;&lt; i;<br> 
      <br> 
      if ((unsigned long)AddrDesc &lt; 4096)<br> 
      AddrDesc = 4096;<br> 
      #ifdef PCIDEBUG<br> 
      printf(&quot; PCI Memory space = 0x%x bytes \n&quot;,AddrDesc);<br> 
      #endif<br> 
      for (AddrProg = PCI_MEMORY_START;<br> 
      AddrProg &lt; LowestMemAddr;<br> 
      AddrProg += AddrDesc);<br> 
      <br> 
      pciConfigOut(BusDevFunc, PCI_CFG_BASE_ADDRESS_0 + (4*AddrSlot),<br> 
      AddrProg, 4);<br> 
      LowestMemAddr = AddrProg + AddrDesc;<br> 
      }<br> 
      else&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <strong>/*  
      I/O 方式*/</strong><br> 
      {<br> 
      AddrDesc &amp;= 0xFFFFFFFC;<br> 
      <br> 
      for (i = 0; (AddrDesc &amp; 1) != 1; i++)&nbsp;&nbsp;&nbsp;&nbsp; <strong>//查询I/O空间的大小</strong><br> 
      AddrDesc = AddrDesc &gt;&gt; 1;<br> 
      <br> 
      AddrDesc = 1 &lt;&lt; i;<br> 
      #ifdef PCIDEBUG<br> 
      printf(&quot; PCI I/O space = 0x%x bytes \n&quot;,AddrDesc);<br> 
      #endif<br> 
      for (AddrProg = PCI_IO_REGION_1_START;<br> 
      AddrProg &lt; LowestIOAddr;<br> 
      AddrProg += AddrDesc);<br> 
      <br> 
      pciConfigOut(BusDevFunc, PCI_CFG_BASE_ADDRESS_0 + (4*AddrSlot),<br> 
      AddrProg, 4);<br> 
      LowestIOAddr = AddrProg + AddrDesc;<br> 
      }<br> 
      <br> 
      }<br> 
      <br> 
      <br> 
      /*<br> 
      * Read Min_Gnt(0x3eh) register value and write it to<br> 
      * the Latency Timer(0xdh) register<br> 
      */<br> 
      Min_Gnt_Val = 0x80;<br> 
      pciConfigOut(BusDevFunc, PCI_CFG_LATENCY_TIMER, Min_Gnt_Val, 1);<br> 
      <br> 
      }</p> 
    </blockquote> 
  </blockquote> 
</blockquote> 
 
<p><font color="#0000FF"><strong><big><big>2.PCI网卡驱动调用过程</big></big></strong></font></p> 
 
<blockquote> 
  <p><big><strong>sysNet.c用于初始化系统的网络</strong></big></p> 
  <p><big><strong>文件sysNet.c中void sysNetHwInit(void)定义了,这里以AMD PCI网卡97x为例:</strong></big></p> 
  <blockquote> 
    <p>#ifdef INCLUDE_PCI_NETWORK<br> 
    &nbsp;&nbsp;&nbsp; unsigned char sysEnetAddr [6]; <strong>/* 网卡的 MAC 地址 */</strong><br> 
    &nbsp;&nbsp;&nbsp; char sys97xLoadString[100];&nbsp;&nbsp;&nbsp; <strong>/*  
    需要为初始化加载的字符串 */</strong><br> 
    #endif</p> 
    <p>#ifdef INCLUDE_PCI_NETWORK<br> 
    &nbsp;&nbsp;&nbsp;&nbsp; STATUS sysIn97xEndBldLoadStr()&nbsp;&nbsp;&nbsp; <strong>//  
    生成网络初始化的字符串</strong><br> 
    </p> 
  </blockquote> 
  <p><strong>函数sysIn97xEndBldLoadStr()调用pciFindDevice()</strong></p> 
  <blockquote> 
    <blockquote> 
      <p>STATUS pciFindDevice&nbsp; <strong>//用Vendor ID和Device ID查找PCI网卡</strong><br> 
      (<br> 
      int VendorID,<br> 
      int DeviceID,<br> 
      int index,<br> 
      int *busDevFunc<br> 
      )<br> 
      {<br> 
      int Device;<br> 
      int tmpBusDevFunc;<br> 
      int tmpIndex;<br> 
      int busNum;<br> 
      <br> 
      tmpIndex = 0;<br> 
      for (busNum = MaxBusNum; busNum &gt;= 0; busNum--)&nbsp;&nbsp;&nbsp; <strong>//查讯Slot</strong><br> 
      {<br> 
      for (Device = 0; Device &lt;= WALNUT_NUM_PCI_SLOTS; Device++)<br> 
      {<br> 
      tmpBusDevFunc = (busNum &lt;&lt; 16) | (Device &lt;&lt; 11);</p> 
    </blockquote> 
    <p><strong>// 如果指定寄存器中Vendor ID和Device ID正确,赋值给*busDevFunc,返回</strong></p> 
    <blockquote> 
      <p>if (pciConfigIn(tmpBusDevFunc, PCI_CFG_VENDOR_ID, 2) == VendorID<br> 
      &amp;&amp; pciConfigIn(tmpBusDevFunc, PCI_CFG_DEVICE_ID, 2) == DeviceID)<br> 
      {<br> 
      if (tmpIndex == index)<br> 
      {<br> 
      *busDevFunc = tmpBusDevFunc;<br> 
      return (OK);<br> 
      }<br> 
      else /* have a match, but not correct index */<br> 
      {<br> 
      tmpIndex++;<br> 
      }<br> 
      } } }<br> 
      return (ERROR); }<br> 
      </p> 
    </blockquote> 
  </blockquote> 
</blockquote> 
 
<p><strong>&nbsp;&nbsp; sysln97xEndBldLoadStr(..)查找PCI以太网卡,得到PCI网卡的基地址,根据PCI插槽Slot选择正确的中断向量,读网卡的MAC地址,然后调用ln97xEndLoad</strong></p> 
 
<blockquote> 
  <blockquote> 
    <blockquote> 
      <p>STATUS sysln97xEndBldLoadStr ( void )<br> 
      {<br> 
      int i;<br> 
      int intvec;<br> 
      int intlvl;<br> 
      ULONG pciMemAddr;<br> 
      unsigned int busDevFunc;</p> 
    </blockquote> 
  </blockquote> 
  <p><br> 
  <strong>/*<br> 
  * 在PCI总线上查找设置第一个AMD设备.<br> 
  * 如果发现存在,函数pciFindDevice 为busDevFunc赋值<br> 
  */</strong></p> 
  <blockquote> 
    <blockquote> 
      <p>if (pciFindDevice(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_79C97X, 0, &amp;busDevFunc))<br> 
      return(ERROR);<br> 
      <br> 
      <strong>/*<br> 
      * 97x的基地址 1 包含PCI存储空间的基地址.<br> 
      */<br> 
      </strong>pciMemAddr = pciConfigIn(busDevFunc, PCI_CFG_BASE_ADDRESS_1, 4);<br> 
      pciMemAddr &amp;= 0xFFFFFFF0;<br> 
      <br> 
      /*<br> 
      * 设置PCI定时器反应时间为50 Set latency timer to 50.<br> 
      */<br> 
      pciConfigOut(busDevFunc, PCI_LATENCY_TIMER, 50, 1);<br> 
      <br> 
      <strong>/*<br> 
      * 每个PCI插槽连接到中断控制器的管脚不一样,中断取决于网卡插在哪一个PCI插槽上.<br> 
      */<br> 
      </strong>switch ((busDevFunc &amp; 0x0000F800) &gt;&gt; 11) /* Strip off just the device  
      */<br> 
      {<br> 
      case 1 : intvec = INT_VEC_PCI_SLOT3; <strong>/* 插槽 3 */</strong><br> 
      intlvl = INT_LVL_PCI_SLOT3;<br> 
      break;<br> 
      case 2 : intvec = INT_VEC_PCI_SLOT2; <strong>/* 插槽 2 */</strong><br> 
      intlvl = INT_LVL_PCI_SLOT2;<br> 
      break;<br> 
      case 3 : intvec = INT_VEC_PCI_SLOT1; <strong>/* 插槽 1 */</strong><br> 
      intlvl = INT_LVL_PCI_SLOT1;<br> 
      break;<br> 
      case 4 : intvec = INT_VEC_PCI_SLOT0; <strong>/* 插槽 0 */</strong><br> 
      intlvl = INT_LVL_PCI_SLOT0;<br> 
      break;<br> 
      default : return(ERROR); /* Not possible, error */<br> 
      <br> 
      }<br> 
      <br> 
      /*<br> 
      * 使能PCI Mem cycles 和 总线 Master 操作<br> 
      */<br> 
      pciConfigOut(busDevFunc, PCI_CFG_COMMAND,<br> 
      PCI_CMD_MEM_ENABLE | PCI_CMD_MASTER_ENABLE, 2);<br> 
      <br> 
      <strong>/*<br> 
      * 得到网卡的MAC地址<br> 
      */</strong><br> 
      for (i=0; i&lt;6; i++)<br> 
      sysEnetAddr[i] = sysInByte(pciMemAddr+APROM01+i);<br> 
      <br> 
      <strong>/*<br> 
      * 生成初始化字符串,如一下形式:<br> 
      *<br> 
      </strong>*  
      &lt;devMemAddr&gt;:&lt;devIoAddr&gt;:&lt;pciMemBase&gt;:&lt;vecNum&gt;:&lt;intLvl&gt;:&lt;memAdrs&gt;:<br> 
      * &lt;memSize&gt;:&lt;memWidth&gt;:&lt;csr3b&gt;:&lt;offset&gt;:&lt;flags&gt;<br> 
      *<br> 
      <strong>* 这个字符串将在函数muxEndLoad()中加载<br> 
      </strong>*/<br> 
      <br> 
      sprintf(sys97xLoadString, &quot;0x%x:0x%x:0:%d:%d:0x%x:0:0x%x:0:0:0&quot;,<br> 
      (unsigned int)pciMemAddr, NONE, intvec, intlvl,<br> 
      NONE,NONE);<br> 
      <br> 
      return(OK);<br> 
      <br> 
      }<br> 
      </p> 
      <p>　</p> 
    </blockquote> 
  </blockquote> 
</blockquote> 
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