327 lines
9.1 KiB
C
327 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/*
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* Copyright (C) 2021 - 2023 Intel Corporation
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*/
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#include "mvm.h"
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#include "iwl-debug.h"
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#include <linux/timekeeping.h>
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#include <linux/math64.h>
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#define IWL_PTP_GP2_WRAP 0x100000000ULL
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#define IWL_PTP_WRAP_TIME (3600 * HZ)
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/* The scaled_ppm parameter is ppm (parts per million) with a 16-bit fractional
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* part, which means that a value of 1 in one of those fields actually means
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* 2^-16 ppm, and 2^16=65536 is 1 ppm.
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*/
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#define SCALE_FACTOR 65536000000ULL
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#define IWL_PTP_WRAP_THRESHOLD_USEC (5000)
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#define IWL_PTP_GET_CROSS_TS_NUM 5
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static void iwl_mvm_ptp_update_new_read(struct iwl_mvm *mvm, u32 gp2)
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{
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/* If the difference is above the threshold, assume it's a wraparound.
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* Otherwise assume it's an old read and ignore it.
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*/
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if (gp2 < mvm->ptp_data.last_gp2 &&
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mvm->ptp_data.last_gp2 - gp2 < IWL_PTP_WRAP_THRESHOLD_USEC) {
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IWL_DEBUG_INFO(mvm,
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"PTP: ignore old read (gp2=%u, last_gp2=%u)\n",
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gp2, mvm->ptp_data.last_gp2);
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return;
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}
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if (gp2 < mvm->ptp_data.last_gp2) {
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mvm->ptp_data.wrap_counter++;
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IWL_DEBUG_INFO(mvm,
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"PTP: wraparound detected (new counter=%u)\n",
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mvm->ptp_data.wrap_counter);
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}
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mvm->ptp_data.last_gp2 = gp2;
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schedule_delayed_work(&mvm->ptp_data.dwork, IWL_PTP_WRAP_TIME);
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}
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u64 iwl_mvm_ptp_get_adj_time(struct iwl_mvm *mvm, u64 base_time_ns)
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{
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struct ptp_data *data = &mvm->ptp_data;
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u64 last_gp2_ns = mvm->ptp_data.scale_update_gp2 * NSEC_PER_USEC;
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u64 res;
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u64 diff;
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iwl_mvm_ptp_update_new_read(mvm,
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div64_u64(base_time_ns, NSEC_PER_USEC));
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IWL_DEBUG_INFO(mvm, "base_time_ns=%llu, wrap_counter=%u\n",
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(unsigned long long)base_time_ns, data->wrap_counter);
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base_time_ns = base_time_ns +
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(data->wrap_counter * IWL_PTP_GP2_WRAP * NSEC_PER_USEC);
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/* It is possible that a GP2 timestamp was received from fw before the
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* last scale update. Since we don't know how to scale - ignore it.
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*/
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if (base_time_ns < last_gp2_ns) {
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IWL_DEBUG_INFO(mvm, "Time before scale update - ignore\n");
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return 0;
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}
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diff = base_time_ns - last_gp2_ns;
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IWL_DEBUG_INFO(mvm, "diff ns=%llu\n", (unsigned long long)diff);
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diff = mul_u64_u64_div_u64(diff, data->scaled_freq,
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SCALE_FACTOR);
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IWL_DEBUG_INFO(mvm, "scaled diff ns=%llu\n", (unsigned long long)diff);
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res = data->scale_update_adj_time_ns + data->delta + diff;
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IWL_DEBUG_INFO(mvm, "base=%llu delta=%lld adj=%llu\n",
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(unsigned long long)base_time_ns, (long long)data->delta,
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(unsigned long long)res);
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return res;
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}
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static int
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iwl_mvm_get_crosstimestamp_fw(struct iwl_mvm *mvm, u32 *gp2, u64 *sys_time)
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{
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struct iwl_synced_time_cmd synced_time_cmd = {
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.operation = cpu_to_le32(IWL_SYNCED_TIME_OPERATION_READ_BOTH)
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};
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struct iwl_host_cmd cmd = {
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.id = WIDE_ID(DATA_PATH_GROUP, WNM_PLATFORM_PTM_REQUEST_CMD),
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.flags = CMD_WANT_SKB,
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.data[0] = &synced_time_cmd,
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.len[0] = sizeof(synced_time_cmd),
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};
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struct iwl_synced_time_rsp *resp;
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struct iwl_rx_packet *pkt;
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int ret;
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u64 gp2_10ns;
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ret = iwl_mvm_send_cmd(mvm, &cmd);
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if (ret)
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return ret;
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pkt = cmd.resp_pkt;
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if (iwl_rx_packet_payload_len(pkt) != sizeof(*resp)) {
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IWL_ERR(mvm, "PTP: Invalid command response\n");
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iwl_free_resp(&cmd);
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return -EIO;
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}
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resp = (void *)pkt->data;
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gp2_10ns = (u64)le32_to_cpu(resp->gp2_timestamp_hi) << 32 |
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le32_to_cpu(resp->gp2_timestamp_lo);
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*gp2 = div_u64(gp2_10ns, 100);
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*sys_time = (u64)le32_to_cpu(resp->platform_timestamp_hi) << 32 |
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le32_to_cpu(resp->platform_timestamp_lo);
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return ret;
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}
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static void iwl_mvm_phc_get_crosstimestamp_loop(struct iwl_mvm *mvm,
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ktime_t *sys_time, u32 *gp2)
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{
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u64 diff = 0, new_diff;
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u64 tmp_sys_time;
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u32 tmp_gp2;
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int i;
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for (i = 0; i < IWL_PTP_GET_CROSS_TS_NUM; i++) {
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iwl_mvm_get_sync_time(mvm, CLOCK_REALTIME, &tmp_gp2, NULL,
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&tmp_sys_time);
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new_diff = tmp_sys_time - ((u64)tmp_gp2 * NSEC_PER_USEC);
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if (!diff || new_diff < diff) {
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*sys_time = tmp_sys_time;
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*gp2 = tmp_gp2;
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diff = new_diff;
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IWL_DEBUG_INFO(mvm, "PTP: new times: gp2=%u sys=%lld\n",
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*gp2, *sys_time);
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}
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}
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}
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static int
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iwl_mvm_phc_get_crosstimestamp(struct ptp_clock_info *ptp,
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struct system_device_crosststamp *xtstamp)
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{
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struct iwl_mvm *mvm = container_of(ptp, struct iwl_mvm,
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ptp_data.ptp_clock_info);
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int ret = 0;
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/* Raw value read from GP2 register in usec */
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u32 gp2;
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/* GP2 value in ns*/
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s64 gp2_ns;
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/* System (wall) time */
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ktime_t sys_time;
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memset(xtstamp, 0, sizeof(struct system_device_crosststamp));
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if (!mvm->ptp_data.ptp_clock) {
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IWL_ERR(mvm, "No PHC clock registered\n");
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return -ENODEV;
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}
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mutex_lock(&mvm->mutex);
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if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_SYNCED_TIME)) {
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ret = iwl_mvm_get_crosstimestamp_fw(mvm, &gp2, &sys_time);
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if (ret)
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goto out;
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} else {
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iwl_mvm_phc_get_crosstimestamp_loop(mvm, &sys_time, &gp2);
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}
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gp2_ns = iwl_mvm_ptp_get_adj_time(mvm, (u64)gp2 * NSEC_PER_USEC);
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IWL_INFO(mvm, "Got Sync Time: GP2:%u, last_GP2: %u, GP2_ns: %lld, sys_time: %lld\n",
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gp2, mvm->ptp_data.last_gp2, gp2_ns, (s64)sys_time);
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/* System monotonic raw time is not used */
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xtstamp->device = (ktime_t)gp2_ns;
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xtstamp->sys_realtime = sys_time;
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out:
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mutex_unlock(&mvm->mutex);
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return ret;
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}
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static void iwl_mvm_ptp_work(struct work_struct *wk)
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{
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struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm,
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ptp_data.dwork.work);
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u32 gp2;
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mutex_lock(&mvm->mutex);
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gp2 = iwl_mvm_get_systime(mvm);
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iwl_mvm_ptp_update_new_read(mvm, gp2);
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mutex_unlock(&mvm->mutex);
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}
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static int iwl_mvm_ptp_gettime(struct ptp_clock_info *ptp,
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struct timespec64 *ts)
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{
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struct iwl_mvm *mvm = container_of(ptp, struct iwl_mvm,
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ptp_data.ptp_clock_info);
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u64 gp2;
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u64 ns;
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mutex_lock(&mvm->mutex);
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gp2 = iwl_mvm_get_systime(mvm);
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ns = iwl_mvm_ptp_get_adj_time(mvm, gp2 * NSEC_PER_USEC);
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mutex_unlock(&mvm->mutex);
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*ts = ns_to_timespec64(ns);
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return 0;
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}
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static int iwl_mvm_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
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{
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struct iwl_mvm *mvm = container_of(ptp, struct iwl_mvm,
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ptp_data.ptp_clock_info);
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struct ptp_data *data = container_of(ptp, struct ptp_data,
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ptp_clock_info);
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mutex_lock(&mvm->mutex);
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data->delta += delta;
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IWL_DEBUG_INFO(mvm, "delta=%lld, new delta=%lld\n", (long long)delta,
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(long long)data->delta);
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mutex_unlock(&mvm->mutex);
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return 0;
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}
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static int iwl_mvm_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
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{
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struct iwl_mvm *mvm = container_of(ptp, struct iwl_mvm,
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ptp_data.ptp_clock_info);
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struct ptp_data *data = &mvm->ptp_data;
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u32 gp2;
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mutex_lock(&mvm->mutex);
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/* Must call _iwl_mvm_ptp_get_adj_time() before updating
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* data->scale_update_gp2 or data->scaled_freq since
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* scale_update_adj_time_ns should reflect the previous scaled_freq.
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*/
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gp2 = iwl_mvm_get_systime(mvm);
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data->scale_update_adj_time_ns =
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iwl_mvm_ptp_get_adj_time(mvm, gp2 * NSEC_PER_USEC);
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data->scale_update_gp2 = gp2;
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data->wrap_counter = 0;
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data->delta = 0;
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data->scaled_freq = SCALE_FACTOR + scaled_ppm;
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IWL_DEBUG_INFO(mvm, "adjfine: scaled_ppm=%ld new=%llu\n",
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scaled_ppm, (unsigned long long)data->scaled_freq);
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mutex_unlock(&mvm->mutex);
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return 0;
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}
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/* iwl_mvm_ptp_init - initialize PTP for devices which support it.
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* @mvm: internal mvm structure, see &struct iwl_mvm.
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*
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* Performs the required steps for enabling PTP support.
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*/
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void iwl_mvm_ptp_init(struct iwl_mvm *mvm)
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{
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/* Warn if the interface already has a ptp_clock defined */
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if (WARN_ON(mvm->ptp_data.ptp_clock))
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return;
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mvm->ptp_data.ptp_clock_info.owner = THIS_MODULE;
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mvm->ptp_data.ptp_clock_info.max_adj = 0x7fffffff;
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mvm->ptp_data.ptp_clock_info.getcrosststamp =
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iwl_mvm_phc_get_crosstimestamp;
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mvm->ptp_data.ptp_clock_info.adjfine = iwl_mvm_ptp_adjfine;
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mvm->ptp_data.ptp_clock_info.adjtime = iwl_mvm_ptp_adjtime;
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mvm->ptp_data.ptp_clock_info.gettime64 = iwl_mvm_ptp_gettime;
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mvm->ptp_data.scaled_freq = SCALE_FACTOR;
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/* Give a short 'friendly name' to identify the PHC clock */
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snprintf(mvm->ptp_data.ptp_clock_info.name,
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sizeof(mvm->ptp_data.ptp_clock_info.name),
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"%s", "iwlwifi-PTP");
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INIT_DELAYED_WORK(&mvm->ptp_data.dwork, iwl_mvm_ptp_work);
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mvm->ptp_data.ptp_clock =
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ptp_clock_register(&mvm->ptp_data.ptp_clock_info, mvm->dev);
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if (IS_ERR(mvm->ptp_data.ptp_clock)) {
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IWL_ERR(mvm, "Failed to register PHC clock (%ld)\n",
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PTR_ERR(mvm->ptp_data.ptp_clock));
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mvm->ptp_data.ptp_clock = NULL;
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} else if (mvm->ptp_data.ptp_clock) {
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IWL_INFO(mvm, "Registered PHC clock: %s, with index: %d\n",
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mvm->ptp_data.ptp_clock_info.name,
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ptp_clock_index(mvm->ptp_data.ptp_clock));
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}
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}
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/* iwl_mvm_ptp_remove - disable PTP device.
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* @mvm: internal mvm structure, see &struct iwl_mvm.
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*
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* Disable PTP support.
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*/
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void iwl_mvm_ptp_remove(struct iwl_mvm *mvm)
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{
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if (mvm->ptp_data.ptp_clock) {
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IWL_INFO(mvm, "Unregistering PHC clock: %s, with index: %d\n",
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mvm->ptp_data.ptp_clock_info.name,
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ptp_clock_index(mvm->ptp_data.ptp_clock));
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ptp_clock_unregister(mvm->ptp_data.ptp_clock);
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mvm->ptp_data.ptp_clock = NULL;
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memset(&mvm->ptp_data.ptp_clock_info, 0,
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sizeof(mvm->ptp_data.ptp_clock_info));
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mvm->ptp_data.last_gp2 = 0;
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cancel_delayed_work_sync(&mvm->ptp_data.dwork);
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}
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}
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