diff options
Diffstat (limited to 'drivers/net/ethernet/freescale/fec_ptp.c')
| -rw-r--r-- | drivers/net/ethernet/freescale/fec_ptp.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c index 4cffda363a14..a4eb6edb850a 100644 --- a/drivers/net/ethernet/freescale/fec_ptp.c +++ b/drivers/net/ethernet/freescale/fec_ptp.c @@ -764,6 +764,56 @@ void fec_ptp_init(struct platform_device *pdev, int irq_idx) schedule_delayed_work(&fep->time_keep, HZ); } +void fec_ptp_save_state(struct fec_enet_private *fep) +{ + unsigned long flags; + u32 atime_inc_corr; + + spin_lock_irqsave(&fep->tmreg_lock, flags); + + fep->ptp_saved_state.pps_enable = fep->pps_enable; + + fep->ptp_saved_state.ns_phc = timecounter_read(&fep->tc); + fep->ptp_saved_state.ns_sys = ktime_get_ns(); + + fep->ptp_saved_state.at_corr = readl(fep->hwp + FEC_ATIME_CORR); + atime_inc_corr = readl(fep->hwp + FEC_ATIME_INC) & FEC_T_INC_CORR_MASK; + fep->ptp_saved_state.at_inc_corr = (u8)(atime_inc_corr >> FEC_T_INC_CORR_OFFSET); + + spin_unlock_irqrestore(&fep->tmreg_lock, flags); +} + +/* Restore PTP functionality after a reset */ +void fec_ptp_restore_state(struct fec_enet_private *fep) +{ + u32 atime_inc = readl(fep->hwp + FEC_ATIME_INC) & FEC_T_INC_MASK; + unsigned long flags; + u32 counter; + u64 ns; + + spin_lock_irqsave(&fep->tmreg_lock, flags); + + /* Reset turned it off, so adjust our status flag */ + fep->pps_enable = 0; + + writel(fep->ptp_saved_state.at_corr, fep->hwp + FEC_ATIME_CORR); + atime_inc |= ((u32)fep->ptp_saved_state.at_inc_corr) << FEC_T_INC_CORR_OFFSET; + writel(atime_inc, fep->hwp + FEC_ATIME_INC); + + ns = ktime_get_ns() - fep->ptp_saved_state.ns_sys + fep->ptp_saved_state.ns_phc; + counter = ns & fep->cc.mask; + writel(counter, fep->hwp + FEC_ATIME); + timecounter_init(&fep->tc, &fep->cc, ns); + + spin_unlock_irqrestore(&fep->tmreg_lock, flags); + + /* Restart PPS if needed */ + if (fep->ptp_saved_state.pps_enable) { + /* Re-enable PPS */ + fec_ptp_enable_pps(fep, 1); + } +} + void fec_ptp_stop(struct platform_device *pdev) { struct net_device *ndev = platform_get_drvdata(pdev); |