Loopback configurations for SCC, FCC in MPC8247

[srideep.devireddy at wipro.com]

 Hi all,

I am using MPC8247. I am using FCC0, FCC1, SCC3 and SCC4 in Ethernet mode. I want to enable local loopback in FCC and SCC. I tried in the following combinations of registers for SCC

   case ETH_LOOPBK_ENBL:
        printk("%s, ETH_LOOPBK_ENBL\n",__FUNCTION__);
                                                                                                                            

        /* ENABLE the LOOP back by setting the 24th and 25th bits
         * as 0 and 1 in GSMRL */
        cep->sccp->scc_gsmrl |= SCC_GSMRL_DIAG_LOOP;
        cpm2_immr->im_cpmux.cmx_scr &= ~CMX_CLK_MASK;
        cpm2_immr->im_cpmux.cmx_scr |= CMX_LPCLK_ROUTE;
        //cep->sccp->scc_gsmrh |= (SCC_GSMRH_CDS | SCC_GSMRH_CTSS);
                                                                                                                            

        /* Configure PSMR for enabling- Promiscuos mode, simultaneous Tx, Rx
         * and Full duplex mode */
        //cep->sccp->scc_psmr |= (SCC_PSMR_PRO | SCC_PSMR_LPB | SCC_PSMR_FDE);
        cep->sccp->scc_psmr |= (SCC_PSMR_PRO | SCC_PSMR_FDE);
        return 0;
                                                                                                                            

      case ETH_LOOPBK_DSBL:
        printk("%s, ETH_LOOPBK_DSBL\n",__FUNCTION__);
        /* Disable the LOOP back and revert back to normal operation by
         * setting the 24th and 25th bits as 0 and 0 in GSMRL */
        cep->sccp->scc_gsmrl &= ~SCC_GSMRL_DIAG_LOOP;
        cpm2_immr->im_cpmux.cmx_scr &= ~CMX_CLK_MASK;
        cpm2_immr->im_cpmux.cmx_scr |= CMX_CLK_ROUTE;

   //cep->sccp->scc_gsmrh &= ~(SCC_GSMRH_CDS | SCC_GSMRH_CTSS);
                                                                                                                            

        /* Revert PSMR settings */
//      cep->sccp->scc_psmr &= ~(SCC_PSMR_PRO | SCC_PSMR_LPB | SCC_PSMR_FDE);
        cep->sccp->scc_psmr &= ~(SCC_PSMR_PRO | SCC_PSMR_FDE);
        return 0;

Following combinations for FCC

       case ETH_LOOPBK_ENBL:
        /* Enable loop back by setting the diag bits in GFMR. Promiscus mode is
         * enabled by setting the FPSMR bit */
        cep->fccp->fcc_gfmr  |= FCC_GFMR_DIAG_LE;
        cep->fccp->fcc_fpsmr |= (FCC_PSMR_PRO | FCC_PSMR_FDE | FCC_PSMR_LPB);
        printk("%s[FCC %2d]: Local Loopback Enabled  [GFMR - 0x%08x, FPSMR - 0x%08x]\n", dev->name, cep->fip->fc_fccnum, cep->fccp->fcc_gfmr, cep->fccp->fcc_fpsmr);

        return 0;
                                                                                                                            

      case ETH_LOOPBK_DSBL:
        /* Disable loopback and promiscus mode */
        cep->fccp->fcc_gfmr  &= ~FCC_GFMR_DIAG_ALE;
        cep->fccp->fcc_fpsmr &= ~(FCC_PSMR_PRO | FCC_PSMR_FDE | FCC_PSMR_LPB);
        printk("%s[FCC %2d]: Local Loopback Disabled [GFMR - 0x%08x, FPSMR - 0x%08x]\n", dev->name, cep->fip->fc_fccnum, cep->fccp->fcc_gfmr, cep->fccp->fcc_fpsmr);

        return 0;



With the above cases the loopback is not enabling. Can any one suggest me the register configurations for eabling loopback in FCC and SCC.

Thanks in advance

srideep




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