📄 程序示例-pci初始化5.htm
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<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="http://drew.nease.net/mypage/example/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
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