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Peng" > > The NETC Timer is capable of recording the timestamp on receipt of an > external pulse on a GPIO pin. It supports two such external triggers. > The recorded value is saved in a 16 entry FIFO accessed by > TMR_ETTSa_H/L. An interrupt can be generated when the trigger occurs, > when the FIFO reaches a threshold, and if the FIFO overflows. > Nit: when the FIFO reaches a threshold or overflows. Reviewed-by: Frank Li > Signed-off-by: F.S. Peng > Signed-off-by: Wei Fang > > --- > v3 changes: > 1. Rebase this patch and use priv->tmr_emask instead of reading > TMR_EMASK register > 2. Rename related macros > 3. Remove the switch statement from netc_timer_enable_extts() and > netc_timer_handle_etts_event() > --- > drivers/ptp/ptp_netc.c | 85 ++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 85 insertions(+) > > diff --git a/drivers/ptp/ptp_netc.c b/drivers/ptp/ptp_netc.c > index aa88767f8355..45d60ad46b68 100644 > --- a/drivers/ptp/ptp_netc.c > +++ b/drivers/ptp/ptp_netc.c > @@ -18,6 +18,7 @@ > #define NETC_TMR_CTRL 0x0080 > #define TMR_CTRL_CK_SEL GENMASK(1, 0) > #define TMR_CTRL_TE BIT(2) > +#define TMR_ETEP(i) BIT(8 + (i)) > #define TMR_COMP_MODE BIT(15) > #define TMR_CTRL_TCLK_PERIOD GENMASK(25, 16) > #define TMR_CTRL_FS BIT(28) > @@ -26,12 +27,22 @@ > #define TMR_TEVNET_PPEN(i) BIT(7 - (i)) > #define TMR_TEVENT_PPEN_ALL GENMASK(7, 5) > #define TMR_TEVENT_ALMEN(i) BIT(16 + (i)) > +#define TMR_TEVENT_ETS_THREN(i) BIT(20 + (i)) > +#define TMR_TEVENT_ETSEN(i) BIT(24 + (i)) > +#define TMR_TEVENT_ETS_OVEN(i) BIT(28 + (i)) > +#define TMR_TEVENT_ETS(i) (TMR_TEVENT_ETS_THREN(i) | \ > + TMR_TEVENT_ETSEN(i) | \ > + TMR_TEVENT_ETS_OVEN(i)) > > #define NETC_TMR_TEMASK 0x0088 > +#define NETC_TMR_STAT 0x0094 > +#define TMR_STAT_ETS_VLD(i) BIT(24 + (i)) > + > #define NETC_TMR_CNT_L 0x0098 > #define NETC_TMR_CNT_H 0x009c > #define NETC_TMR_ADD 0x00a0 > #define NETC_TMR_PRSC 0x00a8 > +#define NETC_TMR_ECTRL 0x00ac > #define NETC_TMR_OFF_L 0x00b0 > #define NETC_TMR_OFF_H 0x00b4 > > @@ -49,6 +60,9 @@ > #define FIPER_CTRL_PW(i) (GENMASK(4, 0) << (i) * 8) > #define FIPER_CTRL_SET_PW(i, v) (((v) & GENMASK(4, 0)) << 8 * (i)) > > +/* i = 0, 1, i indicates the index of TMR_ETTS */ > +#define NETC_TMR_ETTS_L(i) (0x00e0 + (i) * 8) > +#define NETC_TMR_ETTS_H(i) (0x00e4 + (i) * 8) > #define NETC_TMR_CUR_TIME_L 0x00f0 > #define NETC_TMR_CUR_TIME_H 0x00f4 > > @@ -65,6 +79,7 @@ > #define NETC_TMR_DEFAULT_FIPER GENMASK(31, 0) > #define NETC_TMR_FIPER_MAX_PW GENMASK(4, 0) > #define NETC_TMR_ALARM_NUM 2 > +#define NETC_TMR_DEFAULT_ETTF_THR 7 > > /* 1588 timer reference clock source select */ > #define NETC_TMR_CCM_TIMER1 0 /* enet_timer1_clk_root, from CCM */ > @@ -475,6 +490,64 @@ static int net_timer_enable_perout(struct netc_timer *priv, > return err; > } > > +static void netc_timer_handle_etts_event(struct netc_timer *priv, int index, > + bool update_event) > +{ > + struct ptp_clock_event event; > + u32 etts_l = 0, etts_h = 0; > + > + while (netc_timer_rd(priv, NETC_TMR_STAT) & TMR_STAT_ETS_VLD(index)) { > + etts_l = netc_timer_rd(priv, NETC_TMR_ETTS_L(index)); > + etts_h = netc_timer_rd(priv, NETC_TMR_ETTS_H(index)); > + } > + > + /* Invalid time stamp */ > + if (!etts_l && !etts_h) > + return; > + > + if (update_event) { > + event.type = PTP_CLOCK_EXTTS; > + event.index = index; > + event.timestamp = (u64)etts_h << 32; > + event.timestamp |= etts_l; > + ptp_clock_event(priv->clock, &event); > + } > +} > + > +static int netc_timer_enable_extts(struct netc_timer *priv, > + struct ptp_clock_request *rq, int on) > +{ > + int index = rq->extts.index; > + unsigned long flags; > + u32 tmr_ctrl; > + > + /* Reject requests to enable time stamping on both edges */ > + if ((rq->extts.flags & PTP_EXTTS_EDGES) == PTP_EXTTS_EDGES) > + return -EOPNOTSUPP; > + > + spin_lock_irqsave(&priv->lock, flags); > + > + netc_timer_handle_etts_event(priv, rq->extts.index, false); > + if (on) { > + tmr_ctrl = netc_timer_rd(priv, NETC_TMR_CTRL); > + if (rq->extts.flags & PTP_FALLING_EDGE) > + tmr_ctrl |= TMR_ETEP(index); > + else > + tmr_ctrl &= ~TMR_ETEP(index); > + > + netc_timer_wr(priv, NETC_TMR_CTRL, tmr_ctrl); > + priv->tmr_emask |= TMR_TEVENT_ETS(index); > + } else { > + priv->tmr_emask &= ~TMR_TEVENT_ETS(index); > + } > + > + netc_timer_wr(priv, NETC_TMR_TEMASK, priv->tmr_emask); > + > + spin_unlock_irqrestore(&priv->lock, flags); > + > + return 0; > +} > + > static void netc_timer_disable_fiper(struct netc_timer *priv) > { > u32 fiper_ctrl = netc_timer_rd(priv, NETC_TMR_FIPER_CTRL); > @@ -528,6 +601,8 @@ static int netc_timer_enable(struct ptp_clock_info *ptp, > return netc_timer_enable_pps(priv, rq, on); > case PTP_CLK_REQ_PEROUT: > return net_timer_enable_perout(priv, rq, on); > + case PTP_CLK_REQ_EXTTS: > + return netc_timer_enable_extts(priv, rq, on); > default: > return -EOPNOTSUPP; > } > @@ -655,6 +730,9 @@ static const struct ptp_clock_info netc_timer_ptp_caps = { > .n_alarm = 2, > .pps = 1, > .n_per_out = 3, > + .n_ext_ts = 2, > + .supported_extts_flags = PTP_RISING_EDGE | PTP_FALLING_EDGE | > + PTP_STRICT_FLAGS, > .adjfine = netc_timer_adjfine, > .adjtime = netc_timer_adjtime, > .gettimex64 = netc_timer_gettimex64, > @@ -687,6 +765,7 @@ static void netc_timer_init(struct netc_timer *priv) > fiper_ctrl &= ~FIPER_CTRL_PG(i); > } > netc_timer_wr(priv, NETC_TMR_FIPER_CTRL, fiper_ctrl); > + netc_timer_wr(priv, NETC_TMR_ECTRL, NETC_TMR_DEFAULT_ETTF_THR); > > ktime_get_real_ts64(&now); > ns = timespec64_to_ns(&now); > @@ -820,6 +899,12 @@ static irqreturn_t netc_timer_isr(int irq, void *data) > ptp_clock_event(priv->clock, &event); > } > > + if (tmr_event & TMR_TEVENT_ETS(0)) > + netc_timer_handle_etts_event(priv, 0, true); > + > + if (tmr_event & TMR_TEVENT_ETS(1)) > + netc_timer_handle_etts_event(priv, 1, true); > + > spin_unlock(&priv->lock); > > return IRQ_HANDLED; > -- > 2.34.1 >