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Message-ID: <OS3PR01MB659319B48D522B615D21E35FBAC19@OS3PR01MB6593.jpnprd01.prod.outlook.com>
Date: Mon, 16 Jan 2023 16:21:55 +0000
From: Min Li <min.li.xe@...esas.com>
To: "richardcochran@...il.com" <richardcochran@...il.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net 1/2] ptp: idt82p33: Add PTP_CLK_REQ_EXTTS support
Any progress for this review? Thanks
> -----Original Message-----
> From: Min Li <min.li.xe@...esas.com>
> Sent: November 23, 2022 2:52 PM
> To: richardcochran@...il.com
> Cc: linux-kernel@...r.kernel.org; netdev@...r.kernel.org; Min Li
> <min.li.xe@...esas.com>
> Subject: [PATCH net 1/2] ptp: idt82p33: Add PTP_CLK_REQ_EXTTS support
>
> 82P33 family of chips can trigger TOD read/write by external signal from
> one of the IN12/13/14 pins, which are set user space programs by calling
> PTP_PIN_SETFUNC through ptp_ioctl
>
> Signed-off-by: Min Li <min.li.xe@...esas.com>
> ---
> drivers/ptp/ptp_idt82p33.c | 683
> +++++++++++++++++++++++++++++++++----
> drivers/ptp/ptp_idt82p33.h | 20 +-
> 2 files changed, 640 insertions(+), 63 deletions(-)
>
> diff --git a/drivers/ptp/ptp_idt82p33.c b/drivers/ptp/ptp_idt82p33.c index
> 97c1be44e323..aece499c26d4 100644
> --- a/drivers/ptp/ptp_idt82p33.c
> +++ b/drivers/ptp/ptp_idt82p33.c
> @@ -27,6 +27,8 @@ MODULE_VERSION("1.0"); MODULE_LICENSE("GPL");
> MODULE_FIRMWARE(FW_FILENAME);
>
> +#define EXTTS_PERIOD_MS (95)
> +
> /* Module Parameters */
> static u32 phase_snap_threshold = SNAP_THRESHOLD_NS;
> module_param(phase_snap_threshold, uint, 0); @@ -36,6 +38,8 @@
> MODULE_PARM_DESC(phase_snap_threshold,
> static char *firmware;
> module_param(firmware, charp, 0);
>
> +static struct ptp_pin_desc pin_config[MAX_PHC_PLL][MAX_TRIG_CLK];
> +
> static inline int idt82p33_read(struct idt82p33 *idt82p33, u16 regaddr,
> u8 *buf, u16 count)
> {
> @@ -121,24 +125,270 @@ static int idt82p33_dpll_set_mode(struct
> idt82p33_channel *channel,
> return 0;
> }
>
> -static int _idt82p33_gettime(struct idt82p33_channel *channel,
> - struct timespec64 *ts)
> +static int idt82p33_set_tod_trigger(struct idt82p33_channel *channel,
> + u8 trigger, bool write)
> +{
> + struct idt82p33 *idt82p33 = channel->idt82p33;
> + int err;
> + u8 cfg;
> +
> + if (trigger > WR_TRIG_SEL_MAX)
> + return -EINVAL;
> +
> + err = idt82p33_read(idt82p33, channel->dpll_tod_trigger,
> + &cfg, sizeof(cfg));
> +
> + if (err)
> + return err;
> +
> + if (write == true)
> + trigger = (trigger << WRITE_TRIGGER_SHIFT) |
> + (cfg & READ_TRIGGER_MASK);
> + else
> + trigger = (trigger << READ_TRIGGER_SHIFT) |
> + (cfg & WRITE_TRIGGER_MASK);
> +
> + return idt82p33_write(idt82p33, channel->dpll_tod_trigger,
> + &trigger, sizeof(trigger));
> +}
> +
> +static int idt82p33_get_extts(struct idt82p33_channel *channel,
> + struct timespec64 *ts)
> +{
> + struct idt82p33 *idt82p33 = channel->idt82p33;
> + u8 buf[TOD_BYTE_COUNT];
> + int err;
> +
> + err = idt82p33_read(idt82p33, channel->dpll_tod_sts, buf,
> +sizeof(buf));
> +
> + if (err)
> + return err;
> +
> + /* Since trigger is not self clearing itself, we have to poll tod_sts */
> + if (memcmp(buf, channel->extts_tod_sts, TOD_BYTE_COUNT) == 0)
> + return -EAGAIN;
> +
> + memcpy(channel->extts_tod_sts, buf, TOD_BYTE_COUNT);
> +
> + idt82p33_byte_array_to_timespec(ts, buf);
> +
> + if (channel->discard_next_extts) {
> + channel->discard_next_extts = false;
> + return -EAGAIN;
> + }
> +
> + return 0;
> +}
> +
> +static int map_ref_to_tod_trig_sel(int ref, u8 *trigger) {
> + int err = 0;
> +
> + switch (ref) {
> + case 0:
> + *trigger = HW_TOD_TRIG_SEL_IN12;
> + break;
> + case 1:
> + *trigger = HW_TOD_TRIG_SEL_IN13;
> + break;
> + case 2:
> + *trigger = HW_TOD_TRIG_SEL_IN14;
> + break;
> + default:
> + err = -EINVAL;
> + }
> +
> + return err;
> +}
> +
> +static bool is_one_shot(u8 mask)
> +{
> + /* Treat single bit PLL masks as continuous trigger */
> + if ((mask == 1) || (mask == 2))
> + return false;
> + else
> + return true;
> +}
> +
> +static int arm_tod_read_with_trigger(struct idt82p33_channel *channel,
> +u8 trigger)
> {
> struct idt82p33 *idt82p33 = channel->idt82p33;
> u8 buf[TOD_BYTE_COUNT];
> + int err;
> +
> + /* Remember the current tod_sts before setting the trigger */
> + err = idt82p33_read(idt82p33, channel->dpll_tod_sts, buf,
> +sizeof(buf));
> +
> + if (err)
> + return err;
> +
> + memcpy(channel->extts_tod_sts, buf, TOD_BYTE_COUNT);
> +
> + err = idt82p33_set_tod_trigger(channel, trigger, false);
> +
> + if (err)
> + dev_err(idt82p33->dev, "%s: err = %d", __func__, err);
> +
> + return err;
> +}
> +
> +static int idt82p33_extts_enable(struct idt82p33_channel *channel,
> + struct ptp_clock_request *rq, int on) {
> + u8 index = rq->extts.index;
> + struct idt82p33 *idt82p33;
> + u8 mask = 1 << index;
> + int err = 0;
> + u8 old_mask;
> u8 trigger;
> + int ref;
> +
> + idt82p33 = channel->idt82p33;
> + old_mask = idt82p33->extts_mask;
> +
> + /* Reject requests with unsupported flags */
> + if (rq->extts.flags & ~(PTP_ENABLE_FEATURE |
> + PTP_RISING_EDGE |
> + PTP_FALLING_EDGE |
> + PTP_STRICT_FLAGS))
> + return -EOPNOTSUPP;
> +
> + /* Reject requests to enable time stamping on falling edge */
> + if ((rq->extts.flags & PTP_ENABLE_FEATURE) &&
> + (rq->extts.flags & PTP_FALLING_EDGE))
> + return -EOPNOTSUPP;
> +
> + if (index >= MAX_PHC_PLL)
> + return -EINVAL;
> +
> + if (on) {
> + /* Return if it was already enabled */
> + if (idt82p33->extts_mask & mask)
> + return 0;
> +
> + /* Use the pin configured for the channel */
> + ref = ptp_find_pin(channel->ptp_clock, PTP_PF_EXTTS,
> channel->plln);
> +
> + if (ref < 0) {
> + dev_err(idt82p33->dev, "%s: No valid pin found for
> Pll%d!\n",
> + __func__, channel->plln);
> + return -EBUSY;
> + }
> +
> + err = map_ref_to_tod_trig_sel(ref, &trigger);
> +
> + if (err) {
> + dev_err(idt82p33->dev,
> + "%s: Unsupported ref %d!\n", __func__, ref);
> + return err;
> + }
> +
> + err = arm_tod_read_with_trigger(&idt82p33-
> >channel[index], trigger);
> +
> + if (err == 0) {
> + idt82p33->extts_mask |= mask;
> + idt82p33->channel[index].tod_trigger = trigger;
> + idt82p33->event_channel[index] = channel;
> + idt82p33->extts_single_shot =
> is_one_shot(idt82p33->extts_mask);
> +
> + if (old_mask)
> + return 0;
> +
> + schedule_delayed_work(&idt82p33->extts_work,
> +
> msecs_to_jiffies(EXTTS_PERIOD_MS));
> + }
> + } else {
> + idt82p33->extts_mask &= ~mask;
> + idt82p33->extts_single_shot = is_one_shot(idt82p33-
> >extts_mask);
> +
> + if (idt82p33->extts_mask == 0)
> + cancel_delayed_work(&idt82p33->extts_work);
> + }
> +
> + return err;
> +}
> +
> +static int idt82p33_extts_check_channel(struct idt82p33 *idt82p33, u8
> +todn) {
> + struct idt82p33_channel *event_channel;
> + struct ptp_clock_event event;
> + struct timespec64 ts;
> + int err;
> +
> + err = idt82p33_get_extts(&idt82p33->channel[todn], &ts);
> + if (err == 0) {
> + event_channel = idt82p33->event_channel[todn];
> + event.type = PTP_CLOCK_EXTTS;
> + event.index = todn;
> + event.timestamp = timespec64_to_ns(&ts);
> + ptp_clock_event(event_channel->ptp_clock,
> + &event);
> + }
> + return err;
> +}
> +
> +static u8 idt82p33_extts_enable_mask(struct idt82p33_channel *channel,
> + u8 extts_mask, bool enable)
> +{
> + struct idt82p33 *idt82p33 = channel->idt82p33;
> + u8 trigger = channel->tod_trigger;
> + u8 mask;
> int err;
> + int i;
> +
> + if (extts_mask == 0)
> + return 0;
> +
> + if (enable == false)
> + cancel_delayed_work_sync(&idt82p33->extts_work);
> +
> + for (i = 0; i < MAX_PHC_PLL; i++) {
> + mask = 1 << i;
> +
> + if ((extts_mask & mask) == 0)
> + continue;
> +
> + if (enable) {
> + err = arm_tod_read_with_trigger(&idt82p33-
> >channel[i], trigger);
> + if (err)
> + dev_err(idt82p33->dev,
> + "%s: Arm ToD read trigger failed, err
> = %d",
> + __func__, err);
> + } else {
> + err = idt82p33_extts_check_channel(idt82p33, i);
> + if (err == 0 && idt82p33->extts_single_shot)
> + /* trigger happened so we won't re-enable it
> */
> + extts_mask &= ~mask;
> + }
> + }
>
> - trigger = TOD_TRIGGER(HW_TOD_WR_TRIG_SEL_MSB_TOD_CNFG,
> - HW_TOD_RD_TRIG_SEL_LSB_TOD_STS);
> + if (enable)
> + schedule_delayed_work(&idt82p33->extts_work,
> + msecs_to_jiffies(EXTTS_PERIOD_MS));
>
> + return extts_mask;
> +}
> +
> +static int _idt82p33_gettime(struct idt82p33_channel *channel,
> + struct timespec64 *ts)
> +{
> + struct idt82p33 *idt82p33 = channel->idt82p33;
> + u8 old_mask = idt82p33->extts_mask;
> + u8 buf[TOD_BYTE_COUNT];
> + u8 new_mask = 0;
> + int err;
>
> - err = idt82p33_write(idt82p33, channel->dpll_tod_trigger,
> - &trigger, sizeof(trigger));
> + /* Disable extts */
> + if (old_mask)
> + new_mask = idt82p33_extts_enable_mask(channel,
> old_mask, false);
>
> + err = idt82p33_set_tod_trigger(channel,
> HW_TOD_RD_TRIG_SEL_LSB_TOD_STS,
> + false);
> if (err)
> return err;
>
> + channel->discard_next_extts = true;
> +
> if (idt82p33->calculate_overhead_flag)
> idt82p33->start_time = ktime_get_raw();
>
> @@ -147,6 +397,10 @@ static int _idt82p33_gettime(struct
> idt82p33_channel *channel,
> if (err)
> return err;
>
> + /* Re-enable extts */
> + if (new_mask)
> + idt82p33_extts_enable_mask(channel, new_mask, true);
> +
> idt82p33_byte_array_to_timespec(ts, buf);
>
> return 0;
> @@ -165,19 +419,16 @@ static int _idt82p33_settime(struct
> idt82p33_channel *channel,
> struct timespec64 local_ts = *ts;
> char buf[TOD_BYTE_COUNT];
> s64 dynamic_overhead_ns;
> - unsigned char trigger;
> int err;
> u8 i;
>
> - trigger = TOD_TRIGGER(HW_TOD_WR_TRIG_SEL_MSB_TOD_CNFG,
> - HW_TOD_RD_TRIG_SEL_LSB_TOD_STS);
> -
> - err = idt82p33_write(idt82p33, channel->dpll_tod_trigger,
> - &trigger, sizeof(trigger));
> -
> + err = idt82p33_set_tod_trigger(channel,
> HW_TOD_WR_TRIG_SEL_MSB_TOD_CNFG,
> + true);
> if (err)
> return err;
>
> + channel->discard_next_extts = true;
> +
> if (idt82p33->calculate_overhead_flag) {
> dynamic_overhead_ns = ktime_to_ns(ktime_get_raw())
> - ktime_to_ns(idt82p33->start_time);
> @@ -202,7 +453,8 @@ static int _idt82p33_settime(struct
> idt82p33_channel *channel,
> return err;
> }
>
> -static int _idt82p33_adjtime(struct idt82p33_channel *channel, s64
> delta_ns)
> +static int _idt82p33_adjtime_immediate(struct idt82p33_channel
> *channel,
> + s64 delta_ns)
> {
> struct idt82p33 *idt82p33 = channel->idt82p33;
> struct timespec64 ts;
> @@ -226,6 +478,60 @@ static int _idt82p33_adjtime(struct
> idt82p33_channel *channel, s64 delta_ns)
> return err;
> }
>
> +static int _idt82p33_adjtime_internal_triggered(struct idt82p33_channel
> *channel,
> + s64 delta_ns)
> +{
> + struct idt82p33 *idt82p33 = channel->idt82p33;
> + char buf[TOD_BYTE_COUNT];
> + struct timespec64 ts;
> + const u8 delay_ns = 32;
> + s32 remainder;
> + s64 ns;
> + int err;
> +
> + err = _idt82p33_gettime(channel, &ts);
> +
> + if (err)
> + return err;
> +
> + if (ts.tv_nsec > (NSEC_PER_SEC - 5 * NSEC_PER_MSEC)) {
> + /* Too close to miss next trigger, so skip it */
> + mdelay(6);
> + ns = (ts.tv_sec + 2) * NSEC_PER_SEC + delta_ns + delay_ns;
> + } else
> + ns = (ts.tv_sec + 1) * NSEC_PER_SEC + delta_ns + delay_ns;
> +
> + ts = ns_to_timespec64(ns);
> + idt82p33_timespec_to_byte_array(&ts, buf);
> +
> + /*
> + * Store the new time value.
> + */
> + err = idt82p33_write(idt82p33, channel->dpll_tod_cnfg, buf,
> sizeof(buf));
> + if (err)
> + return err;
> +
> + /* Schedule to implement the workaround in one second */
> + (void)div_s64_rem(delta_ns, NSEC_PER_SEC, &remainder);
> + if (remainder != 0)
> + schedule_delayed_work(&channel->adjtime_work, HZ);
> +
> + return idt82p33_set_tod_trigger(channel,
> HW_TOD_TRIG_SEL_TOD_PPS,
> +true); }
> +
> +static void idt82p33_adjtime_workaround(struct work_struct *work) {
> + struct idt82p33_channel *channel = container_of(work,
> + struct
> idt82p33_channel,
> + adjtime_work.work);
> + struct idt82p33 *idt82p33 = channel->idt82p33;
> +
> + mutex_lock(idt82p33->lock);
> + /* Workaround for TOD-to-output alignment issue */
> + _idt82p33_adjtime_internal_triggered(channel, 0);
> + mutex_unlock(idt82p33->lock);
> +}
> +
> static int _idt82p33_adjfine(struct idt82p33_channel *channel, long
> scaled_ppm) {
> struct idt82p33 *idt82p33 = channel->idt82p33; @@ -233,25
> +539,22 @@ static int _idt82p33_adjfine(struct idt82p33_channel
> *channel, long scaled_ppm)
> int err, i;
> s64 fcw;
>
> - if (scaled_ppm == channel->current_freq_ppb)
> - return 0;
> -
> /*
> - * Frequency Control Word unit is: 1.68 * 10^-10 ppm
> + * Frequency Control Word unit is: 1.6861512 * 10^-10 ppm
> *
> * adjfreq:
> - * ppb * 10^9
> - * FCW = ----------
> - * 168
> + * ppb * 10^14
> + * FCW = -----------
> + * 16861512
> *
> * adjfine:
> - * scaled_ppm * 5^12
> - * FCW = -------------
> - * 168 * 2^4
> + * scaled_ppm * 5^12 * 10^5
> + * FCW = ------------------------
> + * 16861512 * 2^4
> */
>
> - fcw = scaled_ppm * 244140625ULL;
> - fcw = div_s64(fcw, 2688);
> + fcw = scaled_ppm * 762939453125ULL;
> + fcw = div_s64(fcw, 8430756LL);
>
> for (i = 0; i < 5; i++) {
> buf[i] = fcw & 0xff;
> @@ -266,26 +569,84 @@ static int _idt82p33_adjfine(struct
> idt82p33_channel *channel, long scaled_ppm)
> err = idt82p33_write(idt82p33, channel->dpll_freq_cnfg,
> buf, sizeof(buf));
>
> - if (err == 0)
> - channel->current_freq_ppb = scaled_ppm;
> -
> return err;
> }
>
> +/* ppb = scaled_ppm * 125 / 2^13 */
> +static s32 idt82p33_ddco_scaled_ppm(long current_ppm, s32 ddco_ppb) {
> + s64 scaled_ppm = div_s64(((s64)ddco_ppb << 13), 125);
> + s64 max_scaled_ppm = div_s64(((s64)DCO_MAX_PPB << 13), 125);
> +
> + current_ppm += scaled_ppm;
> +
> + if (current_ppm > max_scaled_ppm)
> + current_ppm = max_scaled_ppm;
> + else if (current_ppm < -max_scaled_ppm)
> + current_ppm = -max_scaled_ppm;
> +
> + return (s32)current_ppm;
> +}
> +
> +static int idt82p33_stop_ddco(struct idt82p33_channel *channel) {
> + int err;
> +
> + err = _idt82p33_adjfine(channel, channel->current_freq);
> + if (err)
> + return err;
> +
> + channel->ddco = false;
> +
> + return 0;
> +}
> +
> +static int idt82p33_start_ddco(struct idt82p33_channel *channel, s32
> +delta_ns) {
> + s32 current_ppm = channel->current_freq;
> + u32 duration_ms = MSEC_PER_SEC;
> + s32 ppb;
> + int err;
> +
> + /* If the ToD correction is less than 5 nanoseconds, then skip it.
> + * The error introduced by the ToD adjustment procedure would be
> bigger
> + * than the required ToD correction
> + */
> + if (abs(delta_ns) < DDCO_THRESHOLD_NS)
> + return 0;
> +
> + /* For most cases, keep ddco duration 1 second */
> + ppb = delta_ns;
> + while (abs(ppb) > DCO_MAX_PPB) {
> + duration_ms *= 2;
> + ppb /= 2;
> + }
> +
> + err = _idt82p33_adjfine(channel,
> + idt82p33_ddco_scaled_ppm(current_ppm,
> ppb));
> + if (err)
> + return err;
> +
> + /* schedule the worker to cancel ddco */
> + ptp_schedule_worker(channel->ptp_clock,
> + msecs_to_jiffies(duration_ms) - 1);
> + channel->ddco = true;
> +
> + return 0;
> +}
> +
> static int idt82p33_measure_one_byte_write_overhead(
> struct idt82p33_channel *channel, s64 *overhead_ns) {
> struct idt82p33 *idt82p33 = channel->idt82p33;
> ktime_t start, stop;
> + u8 trigger = 0;
> s64 total_ns;
> - u8 trigger;
> int err;
> u8 i;
>
> total_ns = 0;
> *overhead_ns = 0;
> - trigger = TOD_TRIGGER(HW_TOD_WR_TRIG_SEL_MSB_TOD_CNFG,
> - HW_TOD_RD_TRIG_SEL_LSB_TOD_STS);
>
> for (i = 0; i < MAX_MEASURMENT_COUNT; i++) {
>
> @@ -307,8 +668,41 @@ static int
> idt82p33_measure_one_byte_write_overhead(
> return err;
> }
>
> +static int idt82p33_measure_one_byte_read_overhead(
> + struct idt82p33_channel *channel, s64 *overhead_ns) {
> + struct idt82p33 *idt82p33 = channel->idt82p33;
> + ktime_t start, stop;
> + u8 trigger = 0;
> + s64 total_ns;
> + int err;
> + u8 i;
> +
> + total_ns = 0;
> + *overhead_ns = 0;
> +
> + for (i = 0; i < MAX_MEASURMENT_COUNT; i++) {
> +
> + start = ktime_get_raw();
> +
> + err = idt82p33_read(idt82p33, channel->dpll_tod_trigger,
> + &trigger, sizeof(trigger));
> +
> + stop = ktime_get_raw();
> +
> + if (err)
> + return err;
> +
> + total_ns += ktime_to_ns(stop) - ktime_to_ns(start);
> + }
> +
> + *overhead_ns = div_s64(total_ns, MAX_MEASURMENT_COUNT);
> +
> + return err;
> +}
> +
> static int idt82p33_measure_tod_write_9_byte_overhead(
> - struct idt82p33_channel *channel)
> + struct idt82p33_channel *channel)
> {
> struct idt82p33 *idt82p33 = channel->idt82p33;
> u8 buf[TOD_BYTE_COUNT];
> @@ -368,7 +762,7 @@ static int
> idt82p33_measure_settime_gettime_gap_overhead(
>
> static int idt82p33_measure_tod_write_overhead(struct idt82p33_channel
> *channel) {
> - s64 trailing_overhead_ns, one_byte_write_ns, gap_ns;
> + s64 trailing_overhead_ns, one_byte_write_ns, gap_ns,
> one_byte_read_ns;
> struct idt82p33 *idt82p33 = channel->idt82p33;
> int err;
>
> @@ -388,12 +782,19 @@ static int
> idt82p33_measure_tod_write_overhead(struct idt82p33_channel
> *channel)
> if (err)
> return err;
>
> + err = idt82p33_measure_one_byte_read_overhead(channel,
> + &one_byte_read_ns);
> +
> + if (err)
> + return err;
> +
> err = idt82p33_measure_tod_write_9_byte_overhead(channel);
>
> if (err)
> return err;
>
> - trailing_overhead_ns = gap_ns - (2 * one_byte_write_ns);
> + trailing_overhead_ns = gap_ns - 2 * one_byte_write_ns
> + - one_byte_read_ns;
>
> idt82p33->tod_write_overhead_ns -= trailing_overhead_ns;
>
> @@ -462,6 +863,20 @@ static int idt82p33_sync_tod(struct
> idt82p33_channel *channel, bool enable)
> &sync_cnfg, sizeof(sync_cnfg)); }
>
> +static long idt82p33_work_handler(struct ptp_clock_info *ptp) {
> + struct idt82p33_channel *channel =
> + container_of(ptp, struct idt82p33_channel, caps);
> + struct idt82p33 *idt82p33 = channel->idt82p33;
> +
> + mutex_lock(idt82p33->lock);
> + (void)idt82p33_stop_ddco(channel);
> + mutex_unlock(idt82p33->lock);
> +
> + /* Return a negative value here to not reschedule */
> + return -1;
> +}
> +
> static int idt82p33_output_enable(struct idt82p33_channel *channel,
> bool enable, unsigned int outn)
> {
> @@ -524,6 +939,10 @@ static int idt82p33_enable_tod(struct
> idt82p33_channel *channel)
> struct timespec64 ts = {0, 0};
> int err;
>
> + /* STEELAI-366 - Temporary workaround for ts2phc compatibility */
> + if (0)
> + err = idt82p33_output_mask_enable(channel, false);
> +
> err = idt82p33_measure_tod_write_overhead(channel);
>
> if (err) {
> @@ -546,14 +965,15 @@ static void
> idt82p33_ptp_clock_unregister_all(struct idt82p33 *idt82p33)
> u8 i;
>
> for (i = 0; i < MAX_PHC_PLL; i++) {
> -
> channel = &idt82p33->channel[i];
> -
> + cancel_delayed_work_sync(&channel->adjtime_work);
> if (channel->ptp_clock)
> ptp_clock_unregister(channel->ptp_clock);
> }
> }
>
> +
> +
> static int idt82p33_enable(struct ptp_clock_info *ptp,
> struct ptp_clock_request *rq, int on) { @@ -564,7
> +984,8 @@ static int idt82p33_enable(struct ptp_clock_info *ptp,
>
> mutex_lock(idt82p33->lock);
>
> - if (rq->type == PTP_CLK_REQ_PEROUT) {
> + switch (rq->type) {
> + case PTP_CLK_REQ_PEROUT:
> if (!on)
> err = idt82p33_perout_enable(channel, false,
> &rq->perout);
> @@ -575,6 +996,12 @@ static int idt82p33_enable(struct ptp_clock_info
> *ptp,
> else
> err = idt82p33_perout_enable(channel, true,
> &rq->perout);
> + break;
> + case PTP_CLK_REQ_EXTTS:
> + err = idt82p33_extts_enable(channel, rq, on);
> + break;
> + default:
> + break;
> }
>
> mutex_unlock(idt82p33->lock);
> @@ -634,13 +1061,22 @@ static int idt82p33_adjfine(struct
> ptp_clock_info *ptp, long scaled_ppm)
> struct idt82p33 *idt82p33 = channel->idt82p33;
> int err;
>
> + if (channel->ddco == true)
> + return 0;
> +
> + if (scaled_ppm == channel->current_freq)
> + return 0;
> +
> mutex_lock(idt82p33->lock);
> err = _idt82p33_adjfine(channel, scaled_ppm);
> +
> + if (err == 0)
> + channel->current_freq = scaled_ppm;
> mutex_unlock(idt82p33->lock);
> +
> if (err)
> dev_err(idt82p33->dev,
> "Failed in %s with err %d!\n", __func__, err);
> -
> return err;
> }
>
> @@ -651,14 +1087,21 @@ static int idt82p33_adjtime(struct
> ptp_clock_info *ptp, s64 delta_ns)
> struct idt82p33 *idt82p33 = channel->idt82p33;
> int err;
>
> + if (channel->ddco == true)
> + return -EBUSY;
> +
> mutex_lock(idt82p33->lock);
>
> if (abs(delta_ns) < phase_snap_threshold) {
> + err = idt82p33_start_ddco(channel, delta_ns);
> mutex_unlock(idt82p33->lock);
> - return 0;
> + return err;
> }
>
> - err = _idt82p33_adjtime(channel, delta_ns);
> + /* Use more accurate internal 1pps triggered write first */
> + err = _idt82p33_adjtime_internal_triggered(channel, delta_ns);
> + if (err && delta_ns > IMMEDIATE_SNAP_THRESHOLD_NS)
> + err = _idt82p33_adjtime_immediate(channel, delta_ns);
>
> mutex_unlock(idt82p33->lock);
>
> @@ -703,8 +1146,10 @@ static int idt82p33_settime(struct ptp_clock_info
> *ptp,
> return err;
> }
>
> -static int idt82p33_channel_init(struct idt82p33_channel *channel, int
> index)
> +static int idt82p33_channel_init(struct idt82p33 *idt82p33, u32 index)
> {
> + struct idt82p33_channel *channel = &idt82p33->channel[index];
> +
> switch (index) {
> case 0:
> channel->dpll_tod_cnfg = DPLL1_TOD_CNFG; @@ -730,22
> +1175,60 @@ static int idt82p33_channel_init(struct idt82p33_channel
> *channel, int index)
> return -EINVAL;
> }
>
> - channel->current_freq_ppb = 0;
> + channel->plln = index;
> + channel->current_freq = 0;
> + channel->idt82p33 = idt82p33;
> + INIT_DELAYED_WORK(&channel->adjtime_work,
> +idt82p33_adjtime_workaround);
> +
> + return 0;
> +}
>
> +static int idt82p33_verify_pin(struct ptp_clock_info *ptp, unsigned int pin,
> + enum ptp_pin_function func, unsigned int chan)
> {
> + switch (func) {
> + case PTP_PF_NONE:
> + case PTP_PF_EXTTS:
> + break;
> + case PTP_PF_PEROUT:
> + case PTP_PF_PHYSYNC:
> + return -1;
> + }
> return 0;
> }
>
> -static void idt82p33_caps_init(struct ptp_clock_info *caps)
> +static void idt82p33_caps_init(u32 index, struct ptp_clock_info *caps,
> + struct ptp_pin_desc *pin_cfg, u8 max_pins)
> {
> + struct ptp_pin_desc *ppd;
> + int i;
> +
> caps->owner = THIS_MODULE;
> caps->max_adj = DCO_MAX_PPB;
> - caps->n_per_out = 11;
> - caps->adjphase = idt82p33_adjwritephase;
> + caps->n_per_out = MAX_PER_OUT;
> + caps->n_ext_ts = MAX_PHC_PLL,
> + caps->n_pins = max_pins,
> + caps->adjphase = idt82p33_adjwritephase,
> caps->adjfine = idt82p33_adjfine;
> caps->adjtime = idt82p33_adjtime;
> caps->gettime64 = idt82p33_gettime;
> caps->settime64 = idt82p33_settime;
> caps->enable = idt82p33_enable;
> + caps->verify = idt82p33_verify_pin;
> + caps->do_aux_work = idt82p33_work_handler;
> +
> + snprintf(caps->name, sizeof(caps->name), "IDT 82P33 PLL%u",
> index);
> +
> + caps->pin_config = pin_cfg;
> +
> + for (i = 0; i < max_pins; ++i) {
> + ppd = &pin_cfg[i];
> +
> + ppd->index = i;
> + ppd->func = PTP_PF_NONE;
> + ppd->chan = index;
> + snprintf(ppd->name, sizeof(ppd->name), "in%d", 12 + i);
> + }
> }
>
> static int idt82p33_enable_channel(struct idt82p33 *idt82p33, u32 index)
> @@ -758,7 +1241,7 @@ static int idt82p33_enable_channel(struct
> idt82p33 *idt82p33, u32 index)
>
> channel = &idt82p33->channel[index];
>
> - err = idt82p33_channel_init(channel, index);
> + err = idt82p33_channel_init(idt82p33, index);
> if (err) {
> dev_err(idt82p33->dev,
> "Channel_init failed in %s with err %d!\n", @@ -
> 766,11 +1249,8 @@ static int idt82p33_enable_channel(struct idt82p33
> *idt82p33, u32 index)
> return err;
> }
>
> - channel->idt82p33 = idt82p33;
> -
> - idt82p33_caps_init(&channel->caps);
> - snprintf(channel->caps.name, sizeof(channel->caps.name),
> - "IDT 82P33 PLL%u", index);
> + idt82p33_caps_init(index, &channel->caps,
> + pin_config[index], MAX_TRIG_CLK);
>
> channel->ptp_clock = ptp_clock_register(&channel->caps, NULL);
>
> @@ -805,17 +1285,46 @@ static int idt82p33_enable_channel(struct
> idt82p33 *idt82p33, u32 index)
> return 0;
> }
>
> +static int idt82p33_reset(struct idt82p33 *idt82p33, bool cold) {
> + int err;
> + u8 cfg = SOFT_RESET_EN;
> +
> + if (cold == true)
> + goto cold_reset;
> +
> + err = idt82p33_read(idt82p33, REG_SOFT_RESET, &cfg, sizeof(cfg));
> + if (err) {
> + dev_err(idt82p33->dev,
> + "Soft reset failed with err %d!\n", err);
> + return err;
> + }
> +
> + cfg |= SOFT_RESET_EN;
> +
> +cold_reset:
> + err = idt82p33_write(idt82p33, REG_SOFT_RESET, &cfg, sizeof(cfg));
> + if (err)
> + dev_err(idt82p33->dev,
> + "Cold reset failed with err %d!\n", err);
> + return err;
> +}
> +
> static int idt82p33_load_firmware(struct idt82p33 *idt82p33) {
> + char fname[128] = FW_FILENAME;
> const struct firmware *fw;
> struct idt82p33_fwrc *rec;
> u8 loaddr, page, val;
> int err;
> s32 len;
>
> - dev_dbg(idt82p33->dev, "requesting firmware '%s'\n",
> FW_FILENAME);
> + if (firmware) /* module parameter */
> + snprintf(fname, sizeof(fname), "%s", firmware);
> +
> + dev_info(idt82p33->dev, "requesting firmware '%s'\n", fname);
>
> - err = request_firmware(&fw, FW_FILENAME, idt82p33->dev);
> + err = request_firmware(&fw, fname, idt82p33->dev);
>
> if (err) {
> dev_err(idt82p33->dev,
> @@ -863,6 +1372,46 @@ static int idt82p33_load_firmware(struct
> idt82p33 *idt82p33)
> return err;
> }
>
> +static void idt82p33_extts_check(struct work_struct *work) {
> + struct idt82p33 *idt82p33 = container_of(work, struct idt82p33,
> + extts_work.work);
> + struct idt82p33_channel *channel;
> + int err;
> + u8 mask;
> + int i;
> +
> + if (idt82p33->extts_mask == 0)
> + return;
> +
> + mutex_lock(idt82p33->lock);
> +
> + for (i = 0; i < MAX_PHC_PLL; i++) {
> + mask = 1 << i;
> +
> + if ((idt82p33->extts_mask & mask) == 0)
> + continue;
> +
> + err = idt82p33_extts_check_channel(idt82p33, i);
> +
> + if (err == 0) {
> + /* trigger clears itself, so clear the mask */
> + if (idt82p33->extts_single_shot) {
> + idt82p33->extts_mask &= ~mask;
> + } else {
> + /* Re-arm */
> + channel = &idt82p33->channel[i];
> + arm_tod_read_with_trigger(channel,
> channel->tod_trigger);
> + }
> + }
> + }
> +
> + if (idt82p33->extts_mask)
> + schedule_delayed_work(&idt82p33->extts_work,
> + msecs_to_jiffies(EXTTS_PERIOD_MS));
> +
> + mutex_unlock(idt82p33->lock);
> +}
>
> static int idt82p33_probe(struct platform_device *pdev) { @@ -885,25
> +1434,33 @@ static int idt82p33_probe(struct platform_device *pdev)
> idt82p33->pll_mask = DEFAULT_PLL_MASK;
> idt82p33->channel[0].output_mask =
> DEFAULT_OUTPUT_MASK_PLL0;
> idt82p33->channel[1].output_mask =
> DEFAULT_OUTPUT_MASK_PLL1;
> + idt82p33->extts_mask = 0;
> + INIT_DELAYED_WORK(&idt82p33->extts_work,
> idt82p33_extts_check);
>
> mutex_lock(idt82p33->lock);
>
> - err = idt82p33_load_firmware(idt82p33);
> + /* cold reset before loading firmware */
> + idt82p33_reset(idt82p33, true);
>
> + err = idt82p33_load_firmware(idt82p33);
> if (err)
> dev_warn(idt82p33->dev,
> "loading firmware failed with %d\n", err);
>
> + /* soft reset after loading firmware */
> + idt82p33_reset(idt82p33, false);
> +
> if (idt82p33->pll_mask) {
> for (i = 0; i < MAX_PHC_PLL; i++) {
> - if (idt82p33->pll_mask & (1 << i)) {
> + if (idt82p33->pll_mask & (1 << i))
> err = idt82p33_enable_channel(idt82p33, i);
> - if (err) {
> - dev_err(idt82p33->dev,
> - "Failed in %s with err %d!\n",
> - __func__, err);
> - break;
> - }
> + else
> + err = idt82p33_channel_init(idt82p33, i);
> + if (err) {
> + dev_err(idt82p33->dev,
> + "Failed in %s with err %d!\n",
> + __func__, err);
> + break;
> }
> }
> } else {
> @@ -928,6 +1485,8 @@ static int idt82p33_remove(struct
> platform_device *pdev) {
> struct idt82p33 *idt82p33 = platform_get_drvdata(pdev);
>
> + cancel_delayed_work_sync(&idt82p33->extts_work);
> +
> idt82p33_ptp_clock_unregister_all(idt82p33);
>
> return 0;
> diff --git a/drivers/ptp/ptp_idt82p33.h b/drivers/ptp/ptp_idt82p33.h index
> 0ea1c35c0f9f..cddebf05a5b9 100644
> --- a/drivers/ptp/ptp_idt82p33.h
> +++ b/drivers/ptp/ptp_idt82p33.h
> @@ -13,6 +13,8 @@
>
> #define FW_FILENAME "idt82p33xxx.bin"
> #define MAX_PHC_PLL (2)
> +#define MAX_TRIG_CLK (3)
> +#define MAX_PER_OUT (11)
> #define TOD_BYTE_COUNT (10)
> #define DCO_MAX_PPB (92000)
> #define MAX_MEASURMENT_COUNT (5)
> @@ -60,8 +62,18 @@ struct idt82p33_channel {
> struct ptp_clock *ptp_clock;
> struct idt82p33 *idt82p33;
> enum pll_mode pll_mode;
> - s32 current_freq_ppb;
> + /* Workaround for TOD-to-output alignment issue */
> + struct delayed_work adjtime_work;
> + s32 current_freq;
> + /* double dco mode */
> + bool ddco;
> u8 output_mask;
> + /* last input trigger for extts */
> + u8 tod_trigger;
> + bool discard_next_extts;
> + u8 plln;
> + /* remember last tod_sts for extts */
> + u8 extts_tod_sts[TOD_BYTE_COUNT];
> u16 dpll_tod_cnfg;
> u16 dpll_tod_trigger;
> u16 dpll_tod_sts;
> @@ -76,6 +88,12 @@ struct idt82p33 {
> struct idt82p33_channel channel[MAX_PHC_PLL];
> struct device *dev;
> u8 pll_mask;
> + /* Polls for external time stamps */
> + u8 extts_mask;
> + bool extts_single_shot;
> + struct delayed_work extts_work;
> + /* Remember the ptp channel to report extts */
> + struct idt82p33_channel *event_channel[MAX_PHC_PLL];
> /* Mutex to protect operations from being interrupted */
> struct mutex *lock;
> struct regmap *regmap;
> --
> 2.37.3
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