new file mode 100644
@@ -0,0 +1,321 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (C) 2025 Intel Corporation
+ */
+
+#include "mld.h"
+#include "iwl-debug.h"
+#include "hcmd.h"
+#include "ptp.h"
+#include <linux/timekeeping.h>
+
+/* The scaled_ppm parameter is ppm (parts per million) with a 16-bit fractional
+ * part, which means that a value of 1 in one of those fields actually means
+ * 2^-16 ppm, and 2^16=65536 is 1 ppm.
+ */
+#define PTP_SCALE_FACTOR 65536000000ULL
+
+#define IWL_PTP_GP2_WRAP 0x100000000ULL
+#define IWL_PTP_WRAP_TIME (3600 * HZ)
+#define IWL_PTP_WRAP_THRESHOLD_USEC (5000)
+
+static int iwl_mld_get_systime(struct iwl_mld *mld, u32 *gp2)
+{
+ *gp2 = iwl_read_prph(mld->trans, mld->trans->cfg->gp2_reg_addr);
+
+ if (*gp2 == 0x5a5a5a5a)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void iwl_mld_ptp_update_new_read(struct iwl_mld *mld, u32 gp2)
+{
+ IWL_DEBUG_PTP(mld, "PTP: last_gp2=%u, new gp2 read=%u\n",
+ mld->ptp_data.last_gp2, gp2);
+
+ /* If the difference is above the threshold, assume it's a wraparound.
+ * Otherwise assume it's an old read and ignore it.
+ */
+ if (gp2 < mld->ptp_data.last_gp2) {
+ if (mld->ptp_data.last_gp2 - gp2 <
+ IWL_PTP_WRAP_THRESHOLD_USEC) {
+ IWL_DEBUG_PTP(mld,
+ "PTP: ignore old read (gp2=%u, last_gp2=%u)\n",
+ gp2, mld->ptp_data.last_gp2);
+ return;
+ }
+
+ mld->ptp_data.wrap_counter++;
+ IWL_DEBUG_PTP(mld,
+ "PTP: wraparound detected (new counter=%u)\n",
+ mld->ptp_data.wrap_counter);
+ }
+
+ mld->ptp_data.last_gp2 = gp2;
+ schedule_delayed_work(&mld->ptp_data.dwork, IWL_PTP_WRAP_TIME);
+}
+
+u64 iwl_mld_ptp_get_adj_time(struct iwl_mld *mld, u64 base_time_ns)
+{
+ struct ptp_data *data = &mld->ptp_data;
+ u64 scale_time_gp2_ns = mld->ptp_data.scale_update_gp2 * NSEC_PER_USEC;
+ u64 res;
+ u64 diff;
+ s64 scaled_diff;
+
+ lockdep_assert_held(&data->lock);
+
+ iwl_mld_ptp_update_new_read(mld,
+ div64_u64(base_time_ns, NSEC_PER_USEC));
+
+ base_time_ns = base_time_ns +
+ (data->wrap_counter * IWL_PTP_GP2_WRAP * NSEC_PER_USEC);
+
+ /* It is possible that a GP2 timestamp was received from fw before the
+ * last scale update.
+ */
+ if (base_time_ns < scale_time_gp2_ns) {
+ diff = scale_time_gp2_ns - base_time_ns;
+ scaled_diff = -mul_u64_u64_div_u64(diff,
+ data->scaled_freq,
+ PTP_SCALE_FACTOR);
+ } else {
+ diff = base_time_ns - scale_time_gp2_ns;
+ scaled_diff = mul_u64_u64_div_u64(diff,
+ data->scaled_freq,
+ PTP_SCALE_FACTOR);
+ }
+
+ IWL_DEBUG_PTP(mld, "base_time=%llu diff ns=%llu scaled_diff_ns=%lld\n",
+ (unsigned long long)base_time_ns,
+ (unsigned long long)diff, (long long)scaled_diff);
+
+ res = data->scale_update_adj_time_ns + data->delta + scaled_diff;
+
+ IWL_DEBUG_PTP(mld, "scale_update_ns=%llu delta=%lld adj=%llu\n",
+ (unsigned long long)data->scale_update_adj_time_ns,
+ (long long)data->delta, (unsigned long long)res);
+ return res;
+}
+
+static int iwl_mld_ptp_gettime(struct ptp_clock_info *ptp,
+ struct timespec64 *ts)
+{
+ struct iwl_mld *mld = container_of(ptp, struct iwl_mld,
+ ptp_data.ptp_clock_info);
+ struct ptp_data *data = &mld->ptp_data;
+ u32 gp2;
+ u64 ns;
+
+ if (iwl_mld_get_systime(mld, &gp2)) {
+ IWL_DEBUG_PTP(mld, "PTP: gettime: failed to read systime\n");
+ return -EIO;
+ }
+
+ spin_lock_bh(&data->lock);
+ ns = iwl_mld_ptp_get_adj_time(mld, (u64)gp2 * NSEC_PER_USEC);
+ spin_unlock_bh(&data->lock);
+
+ *ts = ns_to_timespec64(ns);
+ return 0;
+}
+
+static int iwl_mld_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+ struct iwl_mld *mld = container_of(ptp, struct iwl_mld,
+ ptp_data.ptp_clock_info);
+ struct ptp_data *data = &mld->ptp_data;
+
+ spin_lock_bh(&data->lock);
+ data->delta += delta;
+ IWL_DEBUG_PTP(mld, "delta=%lld, new delta=%lld\n", (long long)delta,
+ (long long)data->delta);
+ spin_unlock_bh(&data->lock);
+ return 0;
+}
+
+static int iwl_mld_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
+{
+ struct iwl_mld *mld = container_of(ptp, struct iwl_mld,
+ ptp_data.ptp_clock_info);
+ struct ptp_data *data = &mld->ptp_data;
+ u32 gp2;
+
+ /* Must call iwl_mld_ptp_get_adj_time() before updating
+ * data->scale_update_gp2 or data->scaled_freq since
+ * scale_update_adj_time_ns should reflect the previous scaled_freq.
+ */
+ if (iwl_mld_get_systime(mld, &gp2)) {
+ IWL_DEBUG_PTP(mld, "adjfine: failed to read systime\n");
+ return -EBUSY;
+ }
+
+ spin_lock_bh(&data->lock);
+ data->scale_update_adj_time_ns =
+ iwl_mld_ptp_get_adj_time(mld, gp2 * NSEC_PER_USEC);
+ data->scale_update_gp2 = gp2;
+
+ /* scale_update_adj_time_ns now relects the configured delta, the
+ * wrap_counter and the previous scaled frequency. Thus delta and
+ * wrap_counter should be reset, and the scale frequency is updated
+ * to the new frequency.
+ */
+ data->delta = 0;
+ data->wrap_counter = 0;
+ data->scaled_freq = PTP_SCALE_FACTOR + scaled_ppm;
+ IWL_DEBUG_PTP(mld, "adjfine: scaled_ppm=%ld new=%llu\n",
+ scaled_ppm, (unsigned long long)data->scaled_freq);
+ spin_unlock_bh(&data->lock);
+ return 0;
+}
+
+static void iwl_mld_ptp_work(struct work_struct *wk)
+{
+ struct iwl_mld *mld = container_of(wk, struct iwl_mld,
+ ptp_data.dwork.work);
+ struct ptp_data *data = &mld->ptp_data;
+ u32 gp2;
+
+ spin_lock_bh(&data->lock);
+ if (!iwl_mld_get_systime(mld, &gp2))
+ iwl_mld_ptp_update_new_read(mld, gp2);
+ else
+ IWL_DEBUG_PTP(mld, "PTP work: failed to read GP2\n");
+ spin_unlock_bh(&data->lock);
+}
+
+static int
+iwl_mld_get_crosstimestamp_fw(struct iwl_mld *mld, u32 *gp2, u64 *sys_time)
+{
+ struct iwl_synced_time_cmd synced_time_cmd = {
+ .operation = cpu_to_le32(IWL_SYNCED_TIME_OPERATION_READ_BOTH)
+ };
+ struct iwl_host_cmd cmd = {
+ .id = WIDE_ID(DATA_PATH_GROUP, WNM_PLATFORM_PTM_REQUEST_CMD),
+ .flags = CMD_WANT_SKB,
+ .data[0] = &synced_time_cmd,
+ .len[0] = sizeof(synced_time_cmd),
+ };
+ struct iwl_synced_time_rsp *resp;
+ struct iwl_rx_packet *pkt;
+ int ret;
+ u64 gp2_10ns;
+
+ wiphy_lock(mld->wiphy);
+ ret = iwl_mld_send_cmd(mld, &cmd);
+ wiphy_unlock(mld->wiphy);
+ if (ret)
+ return ret;
+
+ pkt = cmd.resp_pkt;
+
+ if (iwl_rx_packet_payload_len(pkt) != sizeof(*resp)) {
+ IWL_DEBUG_PTP(mld, "PTP: Invalid PTM command response\n");
+ iwl_free_resp(&cmd);
+ return -EIO;
+ }
+
+ resp = (void *)pkt->data;
+
+ gp2_10ns = (u64)le32_to_cpu(resp->gp2_timestamp_hi) << 32 |
+ le32_to_cpu(resp->gp2_timestamp_lo);
+ *gp2 = div_u64(gp2_10ns, 100);
+
+ *sys_time = (u64)le32_to_cpu(resp->platform_timestamp_hi) << 32 |
+ le32_to_cpu(resp->platform_timestamp_lo);
+
+ iwl_free_resp(&cmd);
+ return ret;
+}
+
+static int
+iwl_mld_phc_get_crosstimestamp(struct ptp_clock_info *ptp,
+ struct system_device_crosststamp *xtstamp)
+{
+ struct iwl_mld *mld = container_of(ptp, struct iwl_mld,
+ ptp_data.ptp_clock_info);
+ struct ptp_data *data = &mld->ptp_data;
+ int ret = 0;
+ /* Raw value read from GP2 register in usec */
+ u32 gp2;
+ /* GP2 value in ns*/
+ s64 gp2_ns;
+ /* System (wall) time */
+ ktime_t sys_time;
+
+ memset(xtstamp, 0, sizeof(struct system_device_crosststamp));
+
+ ret = iwl_mld_get_crosstimestamp_fw(mld, &gp2, &sys_time);
+ if (ret) {
+ IWL_DEBUG_PTP(mld,
+ "PTP: fw get_crosstimestamp failed (ret=%d)\n",
+ ret);
+ return ret;
+ }
+
+ spin_lock_bh(&data->lock);
+ gp2_ns = iwl_mld_ptp_get_adj_time(mld, (u64)gp2 * NSEC_PER_USEC);
+ spin_unlock_bh(&data->lock);
+
+ IWL_DEBUG_PTP(mld,
+ "Got Sync Time: GP2:%u, last_GP2: %u, GP2_ns: %lld, sys_time: %lld\n",
+ gp2, mld->ptp_data.last_gp2, gp2_ns, (s64)sys_time);
+
+ /* System monotonic raw time is not used */
+ xtstamp->device = ns_to_ktime(gp2_ns);
+ xtstamp->sys_realtime = sys_time;
+
+ return ret;
+}
+
+void iwl_mld_ptp_init(struct iwl_mld *mld)
+{
+ if (WARN_ON(mld->ptp_data.ptp_clock))
+ return;
+
+ spin_lock_init(&mld->ptp_data.lock);
+ INIT_DELAYED_WORK(&mld->ptp_data.dwork, iwl_mld_ptp_work);
+
+ mld->ptp_data.ptp_clock_info.owner = THIS_MODULE;
+ mld->ptp_data.ptp_clock_info.gettime64 = iwl_mld_ptp_gettime;
+ mld->ptp_data.ptp_clock_info.max_adj = 0x7fffffff;
+ mld->ptp_data.ptp_clock_info.adjtime = iwl_mld_ptp_adjtime;
+ mld->ptp_data.ptp_clock_info.adjfine = iwl_mld_ptp_adjfine;
+ mld->ptp_data.scaled_freq = PTP_SCALE_FACTOR;
+ mld->ptp_data.ptp_clock_info.getcrosststamp =
+ iwl_mld_phc_get_crosstimestamp;
+
+ /* Give a short 'friendly name' to identify the PHC clock */
+ snprintf(mld->ptp_data.ptp_clock_info.name,
+ sizeof(mld->ptp_data.ptp_clock_info.name),
+ "%s", "iwlwifi-PTP");
+
+ mld->ptp_data.ptp_clock =
+ ptp_clock_register(&mld->ptp_data.ptp_clock_info, mld->dev);
+
+ if (IS_ERR_OR_NULL(mld->ptp_data.ptp_clock)) {
+ IWL_ERR(mld, "Failed to register PHC clock (%ld)\n",
+ PTR_ERR(mld->ptp_data.ptp_clock));
+ mld->ptp_data.ptp_clock = NULL;
+ } else {
+ IWL_INFO(mld, "Registered PHC clock: %s, with index: %d\n",
+ mld->ptp_data.ptp_clock_info.name,
+ ptp_clock_index(mld->ptp_data.ptp_clock));
+ }
+}
+
+void iwl_mld_ptp_remove(struct iwl_mld *mld)
+{
+ if (mld->ptp_data.ptp_clock) {
+ IWL_INFO(mld, "Unregistering PHC clock: %s, with index: %d\n",
+ mld->ptp_data.ptp_clock_info.name,
+ ptp_clock_index(mld->ptp_data.ptp_clock));
+
+ ptp_clock_unregister(mld->ptp_data.ptp_clock);
+ mld->ptp_data.ptp_clock = NULL;
+ mld->ptp_data.last_gp2 = 0;
+ mld->ptp_data.wrap_counter = 0;
+ cancel_delayed_work_sync(&mld->ptp_data.dwork);
+ }
+}
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@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/*
+ * Copyright (C) 2025 Intel Corporation
+ */
+#ifndef __iwl_mld_ptp_h__
+#define __iwl_mld_ptp_h__
+
+#include <linux/ptp_clock_kernel.h>
+
+/**
+ * struct ptp_data - PTP hardware clock data
+ *
+ * @ptp_clock: struct ptp_clock pointer returned by the ptp_clock_register()
+ * function.
+ * @ptp_clock_info: struct ptp_clock_info that describes a PTP hardware clock
+ * @lock: protects the time adjustments data
+ * @delta: delta between hardware clock and ptp clock in nanoseconds
+ * @scale_update_gp2: GP2 time when the scale was last updated
+ * @scale_update_adj_time_ns: adjusted time when the scale was last updated,
+ * in nanoseconds
+ * @scaled_freq: clock frequency offset, scaled to 65536000000
+ * @last_gp2: the last GP2 reading from the hardware, used for tracking GP2
+ * wraparounds
+ * @wrap_counter: number of wraparounds since scale_update_adj_time_ns
+ * @dwork: worker scheduled every 1 hour to detect workarounds
+ */
+struct ptp_data {
+ struct ptp_clock *ptp_clock;
+ struct ptp_clock_info ptp_clock_info;
+
+ spinlock_t lock;
+ s64 delta;
+ u32 scale_update_gp2;
+ u64 scale_update_adj_time_ns;
+ u64 scaled_freq;
+ u32 last_gp2;
+ u32 wrap_counter;
+ struct delayed_work dwork;
+};
+
+void iwl_mld_ptp_init(struct iwl_mld *mld);
+void iwl_mld_ptp_remove(struct iwl_mld *mld);
+u64 iwl_mld_ptp_get_adj_time(struct iwl_mld *mld, u64 base_time_ns);
+
+#endif /* __iwl_mld_ptp_h__ */
these fils are implementing p2p clock APIs Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com> --- drivers/net/wireless/intel/iwlwifi/mld/ptp.c | 321 +++++++++++++++++++ drivers/net/wireless/intel/iwlwifi/mld/ptp.h | 45 +++ 2 files changed, 366 insertions(+) create mode 100644 drivers/net/wireless/intel/iwlwifi/mld/ptp.c create mode 100644 drivers/net/wireless/intel/iwlwifi/mld/ptp.h