TI中文支持网1、请问DSP C6657 PCIE能做 PHY loopback回环测试吗？2、是不是可以这样理解这个回环测试可以DSP单端进行pcie回路测试？不需要PCie连接接口？
3、是否能提供PHY loopback回环测试示例代码？
Andy Yin1：
可以做loopback，参考下面链接中STK中的PCIE 例程。
http://www.deyisupport.com/question_answer/dsp_arm/c6000_multicore/f/53/t/47664.aspx?pi2132219853=2
lixiaosheng lixiaosheng：
回复 Andy Yin1:
按PCIE手册的步骤，到最后检测链接状态始终是0x1B，我将代码发出来麻烦找找原因，代码是在示例程序基础上增加PHY loopback:
主程序中PCIe初始段：
…………
TSCL = 1; uint16_t lock=0;
pcieRet_e retVal; pcieIbTransCfg_t ibCfg; pcieBarCfg_t barCfg; Pcie_Handle handle = NULL; void *pcieBase; uint32_t i; printfInfoLevel level; level = PRINT_DEBUG;
print_infos(PRINT_SYS_INFO,"**********************************************\n"); print_infos (PRINT_SYS_INFO,"* PCIe Test Start *\n");
if(PcieModeGbl == pcie_RC_MODE) print_infos (PRINT_SYS_INFO,"* RC mode *\n"); else print_infos (PRINT_SYS_INFO,"* EP mode *\n");
print_infos (PRINT_SYS_INFO,"**********************************************\n\n");
print_infos (PRINT_SYS_INFO,"Version #: 0x%08x; string %s =%x\n", Pcie_getVersion(), Pcie_getVersionStr(),(int)level);
if((retVal = Pcie_init(&pcieInitCfg)) != pcie_RET_OK) { System_printf ("LLD device configuration failed (%d)\n", (int)retVal); exit(1); } /* Initialize application buffers */ pcieInitAppBuf();
if ((retVal = Pcie_open(0, &handle)) != pcie_RET_OK) { System_printf ("Open failed (%d)\n", (int)retVal); exit(1); } pcie_getDeviceId(handle); /*1、 Configure SERDES*/ if ((retVal = pcieSerdesCfg()) != pcie_RET_OK) { print_infos (PRINT_ERROR,"PCIe Serdes config failed (%d)\n", (int)retVal); exit(1); }
/*3、 Set the PCIe mode*/ if ((retVal = Pcie_setInterfaceMode(handle,PcieModeGbl)) != pcie_RET_OK) { print_infos (PRINT_ERROR,"Set PCIe Mode failed (%d)\n", (int)retVal); exit(1); }
/*2、 Power up PCIe Module */ if ((retVal = pciePowerCfg()) != pcie_RET_OK) { print_infos (PRINT_ERROR,"PCIe Power Up failed (%d)\n", (int)retVal); exit(1); }
System_printf ("PCIe Power Up.\n");
/*5、 Wait until the PCIe SERDES PLL locks */ while (!lock) { CSL_BootCfgGetPCIEPLLLock(&lock); }
System_printf ("PLL configured.\n"); /*6、CMD_STATUS[LTSSM_EN]=0 禁止链路训练 link training 复位过来自动清除*/ //7、Program the configuration registers in the PCIESS to desired values. if(PcieModeGbl == pcie_RC_MODE) { /* Configure application registers for Root Complex*/ if ((retVal = pcieCfgRC(handle)) != pcie_RET_OK) { System_printf ("Failed to configure PCIe in RC mode (%d)\n", (int)retVal); exit(1); }
/* Configure Address Translation */
barCfg.location = pcie_LOCATION_LOCAL; barCfg.mode = pcie_RC_MODE; barCfg.base = PCIE_IB_LO_ADDR_M; barCfg.prefetch = pcie_BAR_NON_PREF; barCfg.type = pcie_BAR_TYPE32; barCfg.memSpace = pcie_BAR_MEM_MEM; barCfg.idx = PCIE_BAR_IDX_M;
if ((retVal = Pcie_cfgBar(handle, &barCfg)) != pcie_RET_OK) { System_printf ("Failed to configure BAR (%d)\n", (int)retVal); exit(1); }
ibCfg.ibBar = PCIE_BAR_IDX_M; /* Match BAR that was configured above*/ ibCfg.ibStartAddrLo = PCIE_IB_LO_ADDR_M; ibCfg.ibStartAddrHi = PCIE_IB_HI_ADDR_M; ibCfg.ibOffsetAddr = (uint32_t)pcieConvert_CoreLocal2GlobalAddr ((uint32_t)dstBuf.buf); ibCfg.region = PCIE_IB_REGION_M;
if ((retVal = pcieIbTransCfg(handle, &ibCfg)) != pcie_RET_OK) { System_printf ("Failed to configure Inbound Translation (%d)\n", (int)retVal); exit(1); }else { System_printf ("Successfully configured Inbound Translation!\n"); }
if ((retVal = pcieObTransCfg (handle, PCIE_OB_LO_ADDR_M, PCIE_OB_HI_ADDR_M, PCIE_OB_REGION_M)) != pcie_RET_OK) { System_printf ("Failed to configure Outbound Address Translation (%d)\n", (int)retVal); exit(1); } else { System_printf ("Successfully configured Outbound Translation!\n"); }
}else { /* Configure application registers for End Point*/ if ((retVal = pcieCfgEP(handle)) != pcie_RET_OK) { System_printf ("Failed to configure PCIe in EP mode (%d)\n", (int)retVal); exit(1); }
/* Configure Address Translation */
barCfg.location = pcie_LOCATION_LOCAL; barCfg.mode = pcie_EP_MODE; barCfg.base = PCIE_IB_LO_ADDR_S; barCfg.prefetch = pcie_BAR_NON_PREF; barCfg.type = pcie_BAR_TYPE32; barCfg.memSpace = pcie_BAR_MEM_MEM; barCfg.idx = PCIE_BAR_IDX_S;
if ((retVal = Pcie_cfgBar(handle, &barCfg)) != pcie_RET_OK) { System_printf ("Failed to configure BAR!\n"); exit(1); }
ibCfg.ibBar = PCIE_BAR_IDX_S; /* Match BAR that was configured above*/ ibCfg.ibStartAddrLo = PCIE_IB_LO_ADDR_S; ibCfg.ibStartAddrHi = PCIE_IB_HI_ADDR_S; ibCfg.ibOffsetAddr = (uint32_t)pcieConvert_CoreLocal2GlobalAddr ((uint32_t)dstBuf.buf); ibCfg.region = PCIE_IB_REGION_S;
if ((retVal = pcieIbTransCfg(handle, &ibCfg)) != pcie_RET_OK) { System_printf ("Failed to configure Inbound Translation ret=%d!\n", (int)retVal); exit(1); }else { System_printf ("Successfully configured Inbound Translation!\n"); }
if ((retVal = pcieObTransCfg (handle, PCIE_OB_LO_ADDR_S, PCIE_OB_HI_ADDR_S, PCIE_OB_REGION_S)) != pcie_RET_OK) { System_printf ("Failed to configure Outbound Address Translation ret=%d!\n", (int)retVal); exit(1); }else { System_printf ("Successfully configured Outbound Translation!\n"); } }
//loopback、TX、RX loopback允许 if((retVal = pcie_cfgLoopBack(handle)) != pcie_RET_OK) { print_infos (PRINT_ERROR,"Set loopback failed (%d)\n",retVal); exit(1); }
System_printf ("Starting link training…\n"); /*8、Enable link training*/ if ((retVal = pcieLtssmCtrl(handle, TRUE)) != pcie_RET_OK) { System_printf ("Failed to Enable Link Training ret=%d!\n", (int)retVal); exit(1); }
//强制链接从POLL_ACTIVE状态开始 if((retVal = pcie_forceLink(handle)) != pcie_RET_OK) { System_printf ("Failed to force Link Training ret=%d!\n", (int)retVal); exit(1); }/* //pcie_LTSSM_LPBK_ACTIVE 查询POLL_ACTIVE状态 if((retVal = pcie_IsThisState(handle,pcie_LTSSM_LPBK_ACTIVE)) != pcie_RET_OK) { printf_debug(PRINT_DEBUG,"Set force link failed!\n"); exit(1); }*/
/* if((retVal=IsDllActvie(handle)) != pcie_RET_OK) { printf_debug(PRINT_DEBUG,"Data Link Layer Active failed!\n"); exit(1); }*/ /*9、 Wait for link to be up */ pcieWaitLinkUp(handle); //pcie_LTSSM_L0=0x11 ———————–>一直在这这个地方链接状态一直是0x1B System_printf ("Link is up.\n");
………….
//PHY loopback配置
static pcieRet_e pcie_cfgLoopBack(Pcie_Handle handle){ pcieRet_e retVal;
pcieRegisters_t setRegs; pcieRegisters_t getRegs;
pcieSerdesCfg0Reg_t serdesCfg0; pcieSerdesCfg1Reg_t serdesCfg1;
memset (&setRegs, 0, sizeof(setRegs)); memset (&getRegs, 0, sizeof(getRegs)); memset (&serdesCfg0, 0, sizeof(serdesCfg0)); memset (&serdesCfg1, 0, sizeof(serdesCfg1));
pcieLnkCtrlReg_t linkCtr;
memset(&linkCtr,0,sizeof(pcieLnkCtrlReg_t));
getRegs.lnkCtrl = &linkCtr; if ((retVal = Pcie_readRegs (handle, pcie_LOCATION_LOCAL, &getRegs)) != pcie_RET_OK) { printf_debug(PRINT_DEBUG,"Read loopback failed!\n"); return retVal; }
linkCtr.lpbkEn = 1; setRegs.lnkCtrl = &linkCtr; if((retVal = Pcie_writeRegs(handle,pcie_LOCATION_LOCAL, &setRegs)) != pcie_RET_OK) { printf_debug(PRINT_DEBUG,"Set loopback failed!\n"); return retVal; }
memset (&setRegs, 0, sizeof(setRegs)); memset (&getRegs, 0, sizeof(getRegs)); getRegs.serdesCfg0 = &serdesCfg0; // getRegs.serdesCfg1 = &serdesCfg1; if ((retVal = Pcie_readRegs (handle, pcie_LOCATION_LOCAL, &getRegs)) != pcie_RET_OK) { System_printf ("Read SerdesCfg register failed!\n"); return retVal; } serdesCfg0.txLoopback = 0x2; serdesCfg0.rxLoopback = 0x3; serdesCfg0.rxLos = 0; serdesCfg1.txLoopback = 0x2; serdesCfg1.rxLoopback = 0x3; serdesCfg1.rxLos = 0;
setRegs.serdesCfg0 = &serdesCfg0; //setRegs.serdesCfg1 = &serdesCfg1;
if ((retVal = Pcie_writeRegs (handle, pcie_LOCATION_LOCAL, &setRegs)) != pcie_RET_OK) { System_printf ("SET SerdesCfg PHYLOOPBACK failed!\n"); return retVal; }
return pcie_RET_OK;
｝
//force link
static inline pcieRet_e pcie_forceLink(Pcie_Handle handle){ pcieRet_e retVal;
pcieRegisters_t setRegs; pcieRegisters_t getRegs;
pciePlForceLinkReg_t plForceLink;
memset (&setRegs, 0, sizeof(setRegs)); memset (&getRegs, 0, sizeof(getRegs)); memset (&plForceLink, 0, sizeof(plForceLink));
getRegs.plForceLink = &plForceLink;
if ((retVal = Pcie_readRegs (handle, pcie_LOCATION_LOCAL, &getRegs)) != pcie_RET_OK) { System_printf ("Read plForceLink register failed!\n"); return retVal; } plForceLink.lnkState = 0x2; plForceLink.forceLink = 0x1;
setRegs.plForceLink = &plForceLink;
if ((retVal = Pcie_writeRegs (handle, pcie_LOCATION_LOCAL, &setRegs)) != pcie_RET_OK) { System_printf ("SET plForceLink failed!\n"); return retVal; }
return pcie_RET_OK;}
