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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