📄 pci设备(网卡)初始化代码分析.htm
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><meta name="GENERATOR" content="Microsoft FrontPage 4.0"><title>程序示例-PCI初始化</title></head><body><p>>><big><big><a NAME="returntop"></a></big><a href="http://drew.nease.net/">Drew的主页</a></big>----><big><big><aNAME="returntop"></a></big><a href="http://drew.nease.net/mypage/sourcecode.htm">程序示例</a></big>---->PCI</p><div align="center"><center><table border="1" cellspacing="1" width="754" background="../../images/bg1.gif"bordercolor="#88DEEA" bordercolorlight="#88DEEA" bordercolordark="#88DEEA" height="23"bgcolor="#FFFFFF"> <tr> <td height="1" width="75" align="center"><p align="center"><a href="http://drew.nease.net/"><big>主页</big></a></td> <td height="1" width="75" align="center"><p align="center"><a href="http://drew.nease.net/mypage/VxWorks.htm"><font FACE="System" LANG="ZH-CN">VxWorks</font></a></td> <td height="1" width="75" align="center"><p align="center"><a href="http://drew.nease.net/processor/arm.htm"><font FACE="System" LANG="ZH-CN">ARM</font></a></td> <td height="1" width="75" align="center"><p align="center"><a href="http://drew.nease.net/processor/mpc860.htm"><font FACE="System" LANG="ZH-CN">PowerPC</font></a></td> <td height="1" width="75" align="center"><p align="center"><a href="http://drew.nease.net/mypage/driver.htm"><font FACE="System" LANG="ZH-CN">硬件驱动</font></a></td> <td height="1" width="75" align="center"><p align="center"><a href="http://drew.nease.net/mypage/network.htm"><font FACE="System" LANG="ZH-CN">网络协议</font></a></td> <td height="1" width="75" align="center"><p align="center"><a href="http://drew.nease.net/mypage/sourcecode.htm"><font FACE="System" LANG="ZH-CN">程序示例</font></a></td> <td height="1" width="75" align="center"><a href="http://www.embhelp.com/bbs" target="_blank"><font face="System" color="#8000FF">技术论坛</font></a></td> <td height="1" width="75" align="center"><p align="center"><a href="http://www.embhelp.com/download"><font FACE="System" LANG="ZH-CN">下载</font></a></td> <td height="1" width="75" align="center"><a href="../interest.htm"><font face="System" lang="ZH-CN">个人兴趣</font></a></td> </tr></table></center></div><p align="center"> </p><p align="center"><font color="#0000FF"><big><big><big>PCI设备(网卡)初始化代码分析</big></big></big></font></p><p> </p><p><strong> 这里以PowerPC上的PCI设备为例,介绍PCI设备初始化编程的过程,其他CPU的PCI基本框架是类似的.</strong></p> <p><strong><big> PowerPC的PCI控制器符合PCI2.2标准,以下使我解读的VxWorks系统PCI设备程序代码分析</big></strong></p> <p><big><big><strong>主要执行过程</strong></big></big></p> <p><font color="#0000FF"><strong><big><big>1.初始化PCI设备</big></big></strong></font></p> <p>文件romInit.s中romInit()=======>文件bootInit.c中romStart()========>文件usrConfig.c中的usrInit()======>文件syslib.c中的sysHwInit()</p> <p><strong><big><big>syslib.c</big> </big></strong></p> <p>void <strong>sysHwInit (void)</strong>{ <strong>//用于初始化系统硬件</strong></p> <blockquote> <blockquote> <blockquote> <p>......................</p> <p><strong>//和网络,PCI有关的函数</strong></p> <p>#ifdef INCLUDE_EMAC_NETWORK<br> </p> <p><strong>//初始化媒介访问层MAL(控制EMAC和Buffer Descriptor BD间的数据传输)</strong></p> <p>malReset(); </p> <p>#endif<br> <br> #ifdef INCLUDE_PCI <br> pciInit(); <strong>//初始化PCI</strong><br> #endif<br> <br> #ifdef INCLUDE_NETWORK<br> sysNetHwInit(); <strong>//初始化网络接口</strong><br> #endif</p> <p>}</p> </blockquote> </blockquote> <p> </p> <p><strong>//该函数初始化PCI</strong></p> <p><strong>PCI的地址转换形式: </strong></p> <blockquote> <p><strong>CPU->PCI (master/initiator) 地址转换<br> PCI->CPU (slave/target) 地址转换</strong></p> </blockquote> <p><strong>void pciInit() <br> </strong>{</p> <blockquote> <blockquote> <p>unsigned short temp_short;<br> <br> /*<br> <strong>* 初始化并 disable 所有的 PCI Master regions(三个), <br> </strong> <strong>little endian,直接对寄存器R操作</strong> */<br> <br> sysPciOutLong(PMM0MA, PMM_UNUSED);<br> sysPciOutLong(PMM1MA, PMM_UNUSED);<br> sysPciOutLong(PMM2MA, PMM_UNUSED);</p> <p><strong>/*</strong></p> </blockquote> </blockquote> <blockquote> <p><strong>解释:</strong></p> </blockquote> <blockquote> <blockquote> <p><strong>PMM0MA:地址 0xEE400004, 控制PLB上的映射到PCI存储空间的range0大小和属性. </strong></p> <p><strong>在PLB上共有三个ranges, PMM1MA代表区域rang1, PMM2MA代表区域range2.</strong></p> <p><strong>PMM_UNUSED: 0x00000000 </strong></p> </blockquote> <p><strong>range的定义</strong></p> <blockquote> <p><strong>range: map PLB======>PCI 64-bit</strong></p> <p><strong>PPBridge(PLB和PCI设备间的接口)responds as a target on the PLB bus in servral address ranges.</strong></p> <p><strong>These ranges allow a PLB Master to configure the PPBridge and to cause PPBridge to generate Mem I/O,interrupt acknowledge and special cycles to PCI bus.</strong></p> <p><strong>*/</strong></p> <p><br> /*<br> * Initially disable PCI Target region 2 to start. Region 1 is hardwired<br> * to always be active.<br> */<br> <br> <strong>//PTM2MS:地址 0xEF400038,定义PCI存储空间的大小.这里清零</strong></p> <p>sysPciOutLong(PTM2MS, PTM_UNUSED);</p> </blockquote> </blockquote> <blockquote> <blockquote> <p>/*<br> <strong>* Drive PCI 重新置位. 用于热启动,置位必须保持1ms<br> </strong>*/<br> </p> </blockquote> </blockquote> <blockquote> <p><strong>//解释: 从PCI寄存器PCI_CFG_BRIDGE_OPT2中读出数值</strong></p> </blockquote> <p><strong> 其中 PPC405GP_PCI_BUSDEVFUNC = 0x00000000;</strong></p> <p><strong> PCI_CFG_BRIDGE_OPT2 = 0x60</strong></p> <blockquote> <blockquote> <p>temp_short = pciConfigIn(PPC405GP_PCI_BUSDEVFUNC, PCI_CFG_BRIDGE_OPT2, 2);</p> </blockquote> </blockquote> <blockquote> <p><strong>//把读出的值放回寄存器PCI_CFG_BRIDGE_OPT2中</strong></p> </blockquote> <blockquote> <blockquote> <p>pciConfigOut(PPC405GP_PCI_BUSDEVFUNC, PCI_CFG_BRIDGE_OPT2,<br> temp_short | 0x1000, 2);</p> </blockquote> </blockquote> <blockquote> <blockquote> <p>sysLocalDelay(1); /* <strong>延时1ms</strong> kernel may not be up yet!! */</p> </blockquote> </blockquote> <blockquote> <p><strong>//再放一次</strong></p> </blockquote> <blockquote> <blockquote> <p>pciConfigOut(PPC405GP_PCI_BUSDEVFUNC, PCI_CFG_BRIDGE_OPT2, temp_short, 2);<br> </p> </blockquote> </blockquote> <p><strong>/*<br> * 设置PCI Master(PMM),这是从本地存储地址Local memory address到PCI空间的映射 * CPU->PCI,参见文件 See config.h中的定义,参考 <a href="config.htm">BSP配置文件</a><br> */<br> </strong></p> <blockquote> <blockquote> <p><strong>//说明sysPciOutLong(A,B);放B到A</strong></p> <p><strong>//PMM region 0 </strong></p> <p><strong>//PMM0LA 0xEF400000, PMM0_LOCAL_ADRS 0x80000000</strong></p> <p>sysPciOutLong(PMM0LA, PMM0_LOCAL_ADRS);</p> <p><strong>//PMM0PCILA 0xEF400008, PMM0_PCI_LOW_ADRS 0x80000000</strong></p> <p>sysPciOutLong(PMM0PCILA, PMM0_PCI_LOW_ADRS);</p> <p><strong>//PMM0PCIHA 0xEF40000C, PMM0_PCI_HIGH_ADRS 0x00000000</strong></p> <p>sysPciOutLong(PMM0PCIHA, PMM0_PCI_HIGH_ADRS);</p> <p><strong>//PMM0MA 0xEF400004, </strong></p> <p><strong>//PMM0_PCI_MASK_ATTRIB PMM_MASK_512MB|PMM_ENABLE</strong></p> <p>sysPciOutLong(PMM0MA, PMM0_PCI_MASK_ATTRIB);<br> </p> </blockquote> <blockquote> <p>sysPciOutLong(PMM1LA, PMM1_LOCAL_ADRS); /* PMM region 1 */<br> sysPciOutLong(PMM1PCILA, PMM1_PCI_LOW_ADRS);<br> sysPciOutLong(PMM1PCIHA, PMM1_PCI_HIGH_ADRS);<br> sysPciOutLong(PMM1MA, PMM1_PCI_MASK_ATTRIB);<br> <br> sysPciOutLong(PMM2LA, PMM2_LOCAL_ADRS); /* PMM region 2 */<br> sysPciOutLong(PMM2PCILA, PMM2_PCI_LOW_ADRS);<br> sysPciOutLong(PMM2PCIHA, PMM2_PCI_HIGH_ADRS);<br> sysPciOutLong(PMM2MA, PMM2_PCI_MASK_ATTRIB);<br> </p> </blockquote> </blockquote> </blockquote> <blockquote> <p><br> <strong>/*<br> * 设置 PCI Target (PTM). 这是从PCI的地址到本地地址的映射<br> * 参见文件 config.h中的定义<br> * 如果不是用 region 2, 必须保证它的使能位关闭,region 1硬件连接使能.<br> */<br> </strong></p> </blockquote> <blockquote> <blockquote> <blockquote> <p><strong>//PTM1LA 0xEF400034, PTM1_LOCAL_ADRS 0x00000000</strong></p> <p>sysPciOutLong(PTM1LA, PTM1_LOCAL_ADRS);</p> <p><strong>//PTM1MS 0xEF400030, </strong></p> <p>sysPciOutLong(PTM1MS, PTM1_SIZE_ATTRIB);<br> <br> ...................</p> </blockquote> </blockquote> <p><strong>/*<br> * 写 405GP PCI 设置寄存器.<br> * 使能 405GP,使其成为PCI总线的一个master (PMM).<br> * 使能 405GP 作为一个PCI memory target (PTM).<br> */</strong></p> <blockquote> <blockquote> <p>temp_short = pciConfigIn(PPC405GP_PCI_BUSDEVFUNC, PCI_CFG_COMMAND, 2);<br> temp_short = temp_short | PCI_CMD_MASTER_ENABLE | PCI_CMD_MEM_ENABLE;<br> pciConfigOut(PPC405GP_PCI_BUSDEVFUNC, PCI_CFG_COMMAND, temp_short, 2);<br> <br> ..........................<br> </p> </blockquote> </blockquote> <p><strong>/*<br> * 作为PCI的主机host扫描PCI总线,查找PCI设备. 并为每个设备分配唯一的PCI或I/O地址* 空间<br> */</strong></p> <blockquote> <blockquote> <p>pciScan(0);<br> return;<br> }</p> <p> </p> </blockquote> </blockquote> </blockquote> <p><strong>//pciScan() - 扫描PCI总线,根据PCI ID和 vender ID查找设置现有的PCI设备</strong></p> <blockquote> <blockquote> <blockquote> <p>void pciScan<br> (<br> int busNum <br> )<br> {<br> int Device;<br> int BusDevFunc;</p> </blockquote> </blockquote> <p><br> <br> <strong>/*<br> * 从device 1开始,查找每个Slot,如有PCI设备,分配内存和I/O, 405GP是 device 0.<br> */</strong></p> <blockquote> <blockquote> <p><br> for (Device = 1; Device <= WALNUT_NUM_PCI_SLOTS; Device++)<br> {<br> ⌨️ 快捷键说明
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