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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. > > Signed-off-by: F.S. Peng > Signed-off-by: Wei Fang Reviewed-by: Frank Li > --- > drivers/ptp/ptp_netc.c | 118 +++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 118 insertions(+) > > diff --git a/drivers/ptp/ptp_netc.c b/drivers/ptp/ptp_netc.c > index 289cdd50ae3d..c2fc6351db5b 100644 > --- a/drivers/ptp/ptp_netc.c > +++ b/drivers/ptp/ptp_netc.c > @@ -18,6 +18,8 @@ > #define NETC_TMR_CTRL 0x0080 > #define TMR_CTRL_CK_SEL GENMASK(1, 0) > #define TMR_CTRL_TE BIT(2) > +#define TMR_ETEP1 BIT(8) > +#define TMR_ETEP2 BIT(9) > #define TMR_COMP_MODE BIT(15) > #define TMR_CTRL_TCLK_PERIOD GENMASK(25, 16) > #define TMR_CTRL_FS BIT(28) > @@ -28,12 +30,26 @@ > #define TMR_TEVENT_PPEN_ALL GENMASK(7, 5) > #define TMR_TEVENT_ALM1EN BIT(16) > #define TMR_TEVENT_ALM2EN BIT(17) > +#define TMR_TEVENT_ETS1_THREN BIT(20) > +#define TMR_TEVENT_ETS2_THREN BIT(21) > +#define TMR_TEVENT_ETS1EN BIT(24) > +#define TMR_TEVENT_ETS2EN BIT(25) > +#define TMR_TEVENT_ETS1_OVEN BIT(28) > +#define TMR_TEVENT_ETS2_OVEN BIT(29) > +#define TMR_TEVENT_ETS1 (TMR_TEVENT_ETS1_THREN | \ > + TMR_TEVENT_ETS1EN | TMR_TEVENT_ETS1_OVEN) > +#define TMR_TEVENT_ETS2 (TMR_TEVENT_ETS2_THREN | \ > + TMR_TEVENT_ETS2EN | TMR_TEVENT_ETS2_OVEN) > > #define NETC_TMR_TEMASK 0x0088 > +#define NETC_TMR_STAT 0x0094 > +#define TMR_STAT_ETS1_VLD BIT(24) > +#define TMR_STAT_ETS2_VLD BIT(25) > #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 > > @@ -51,6 +67,10 @@ > #define FIPER_CTRL_PW(i) (GENMASK(4, 0) << (i) * 8) > #define FIPER_CTRL_SET_PW(i, v) (((v) & GENMASK(4, 0)) << 8 * (i)) > > +#define NETC_TMR_ETTS1_L 0x00e0 > +#define NETC_TMR_ETTS1_H 0x00e4 > +#define NETC_TMR_ETTS2_L 0x00e8 > +#define NETC_TMR_ETTS2_H 0x00ec > #define NETC_TMR_CUR_TIME_L 0x00f0 > #define NETC_TMR_CUR_TIME_H 0x00f4 > > @@ -67,6 +87,7 @@ > #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 */ > @@ -450,6 +471,91 @@ 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) > +{ > + u32 regoff_l, regoff_h, etts_l, etts_h, ets_vld; > + struct ptp_clock_event event; > + > + switch (index) { > + case 0: > + ets_vld = TMR_STAT_ETS1_VLD; > + regoff_l = NETC_TMR_ETTS1_L; > + regoff_h = NETC_TMR_ETTS1_H; > + break; > + case 1: > + ets_vld = TMR_STAT_ETS2_VLD; > + regoff_l = NETC_TMR_ETTS2_L; > + regoff_h = NETC_TMR_ETTS2_H; > + break; > + default: > + return; > + } > + > + if (!(netc_timer_rd(priv, NETC_TMR_STAT) & ets_vld)) > + return; > + > + do { > + etts_l = netc_timer_rd(priv, regoff_l); > + etts_h = netc_timer_rd(priv, regoff_h); > + } while (netc_timer_rd(priv, NETC_TMR_STAT) & ets_vld); > + > + 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) > +{ > + u32 ets_emask, tmr_emask, tmr_ctrl, ettp_bit; > + unsigned long flags; > + > + /* Reject requests to enable time stamping on both edges */ > + if ((rq->extts.flags & PTP_EXTTS_EDGES) == PTP_EXTTS_EDGES) > + return -EOPNOTSUPP; > + > + switch (rq->extts.index) { > + case 0: > + ettp_bit = TMR_ETEP1; > + ets_emask = TMR_TEVENT_ETS1; > + break; > + case 1: > + ettp_bit = TMR_ETEP2; > + ets_emask = TMR_TEVENT_ETS2; > + break; > + default: > + return -EINVAL; > + } > + > + spin_lock_irqsave(&priv->lock, flags); > + > + netc_timer_handle_etts_event(priv, rq->extts.index, false); > + tmr_emask = netc_timer_rd(priv, NETC_TMR_TEMASK); > + if (on) { > + tmr_ctrl = netc_timer_rd(priv, NETC_TMR_CTRL); > + if (rq->extts.flags & PTP_FALLING_EDGE) > + tmr_ctrl |= ettp_bit; > + else > + tmr_ctrl &= ~ettp_bit; > + > + netc_timer_wr(priv, NETC_TMR_CTRL, tmr_ctrl); > + tmr_emask |= ets_emask; > + } else { > + tmr_emask &= ~ets_emask; > + } > + > + netc_timer_wr(priv, NETC_TMR_TEMASK, 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); > @@ -505,6 +611,8 @@ 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; > } > @@ -638,6 +746,9 @@ static const struct ptp_clock_info netc_timer_ptp_caps = { > .n_pins = 0, > .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, > @@ -670,6 +781,7 @@ 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); > @@ -822,6 +934,12 @@ static irqreturn_t netc_timer_isr(int irq, void *data) > ptp_clock_event(priv->clock, &event); > } > > + if (tmr_event & TMR_TEVENT_ETS1) > + netc_timer_handle_etts_event(priv, 0, true); > + > + if (tmr_event & TMR_TEVENT_ETS2) > + netc_timer_handle_etts_event(priv, 1, true); > + > /* Clear interrupts status */ > netc_timer_wr(priv, NETC_TMR_TEVENT, tmr_event); > > -- > 2.34.1 >