From: Krishnanand Prabhu <krishnanand.prabhu@xxxxxxxxx>
Add support to enable/disable PHC clock. The PHC clock includes support
for fetching the cross timestamp i.e. a non-atomic snapshot of the current
time from the hardware (WiFi device) clock and system clock (wall-clock)
simultaneously.
Signed-off-by: Krishnanand Prabhu <krishnanand.prabhu@xxxxxxxxx>
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
Signed-off-by: Gregory Greenman <gregory.greenman@xxxxxxxxx>
---
.../net/wireless/intel/iwlwifi/mvm/Makefile | 1 +
drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 3 +
drivers/net/wireless/intel/iwlwifi/mvm/mvm.h | 15 ++
drivers/net/wireless/intel/iwlwifi/mvm/ops.c | 2 +
drivers/net/wireless/intel/iwlwifi/mvm/ptp.c | 131 ++++++++++++++++++
5 files changed, 152 insertions(+)
create mode 100644 drivers/net/wireless/intel/iwlwifi/mvm/ptp.c
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/Makefile b/drivers/net/wireless/intel/iwlwifi/mvm/Makefile
index b82f79ac5378..943e8de9bc98 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/Makefile
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/Makefile
@@ -8,6 +8,7 @@ iwlmvm-y += tt.o offloading.o tdls.o
iwlmvm-y += ftm-responder.o ftm-initiator.o
iwlmvm-y += rfi.o
iwlmvm-y += mld-key.o mld-mac.o link.o mld-sta.o mld-mac80211.o
+iwlmvm-y += ptp.o
iwlmvm-$(CONFIG_IWLWIFI_DEBUGFS) += debugfs.o debugfs-vif.o
iwlmvm-$(CONFIG_IWLWIFI_LEDS) += led.o
iwlmvm-$(CONFIG_PM) += d3.o
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index fe7dfdcd531b..4079c0d939c1 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -1669,6 +1669,9 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
iwl_mvm_send_recovery_cmd(mvm, ERROR_RECOVERY_UPDATE_DB);
+ if (!mvm->ptp_data.ptp_clock)
+ iwl_mvm_ptp_init(mvm);
+
if (iwl_acpi_get_eckv(mvm->dev, &mvm->ext_clock_valid))
IWL_DEBUG_INFO(mvm, "ECKV table doesn't exist in BIOS\n");
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index 7cc3526e78ce..4d99e76811a3 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -16,6 +16,8 @@
#include <linux/thermal.h>
#endif
+#include <linux/ptp_clock_kernel.h>
+
#include <linux/ktime.h>
#include "iwl-op-mode.h"
@@ -770,6 +772,15 @@ struct iwl_mvm_dqa_txq_info {
enum iwl_mvm_queue_status status;
};
+struct ptp_data {
+ struct ptp_clock *ptp_clock;
+ struct ptp_clock_info ptp_clock_info;
+ /* keeps track of GP2 wrap-around */
+ u32 last_gp2;
+ u32 wrap_counter;
+ struct delayed_work dwork;
+};
+
struct iwl_mvm {
/* for logger access */
struct device *dev;
@@ -1080,6 +1091,8 @@ struct iwl_mvm {
struct list_head resp_pasn_list;
+ struct ptp_data ptp_data;
+
struct {
u8 range_resp;
} cmd_ver;
@@ -2121,6 +2134,8 @@ void iwl_mvm_event_frame_timeout_callback(struct iwl_mvm *mvm,
const struct ieee80211_sta *sta,
u16 tid);
+void iwl_mvm_ptp_init(struct iwl_mvm *mvm);
+void iwl_mvm_ptp_remove(struct iwl_mvm *mvm);
int iwl_mvm_sar_select_profile(struct iwl_mvm *mvm, int prof_a, int prof_b);
int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm);
int iwl_mvm_ppag_send_cmd(struct iwl_mvm *mvm);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 03da4e53de67..e7def1a0f767 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -1435,6 +1435,8 @@ static void iwl_op_mode_mvm_stop(struct iwl_op_mode *op_mode)
kfree(mvm->error_recovery_buf);
mvm->error_recovery_buf = NULL;
+ iwl_mvm_ptp_remove(mvm);
+
iwl_trans_op_mode_leave(mvm->trans);
iwl_phy_db_free(mvm->phy_db);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ptp.c b/drivers/net/wireless/intel/iwlwifi/mvm/ptp.c
new file mode 100644
index 000000000000..f786f5efb497
--- /dev/null
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ptp.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (C) 2021 - 2023 Intel Corporation
+ */
+
+#include "mvm.h"
+#include "iwl-debug.h"
+#include <linux/timekeeping.h>
+
+#define IWL_PTP_GP2_WRAP 0x100000000ULL
+#define IWL_PTP_WRAP_TIME (3600 * HZ)
+
+static void iwl_mvm_ptp_update_new_read(struct iwl_mvm *mvm, u32 gp2)
+{
+ if (gp2 < mvm->ptp_data.last_gp2) {
+ mvm->ptp_data.wrap_counter++;
+ IWL_DEBUG_INFO(mvm,
+ "PTP: wraparound detected (new counter=%u)\n",
+ mvm->ptp_data.wrap_counter);
+ }
+
+ mvm->ptp_data.last_gp2 = gp2;
+ schedule_delayed_work(&mvm->ptp_data.dwork, IWL_PTP_WRAP_TIME);
+}
+
+static int
+iwl_mvm_phc_get_crosstimestamp(struct ptp_clock_info *ptp,
+ struct system_device_crosststamp *xtstamp)
+{
+ struct iwl_mvm *mvm = container_of(ptp, struct iwl_mvm,
+ ptp_data.ptp_clock_info);
+ /* 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));
+
+ if (!mvm->ptp_data.ptp_clock) {
+ IWL_ERR(mvm, "No PHC clock registered\n");
+ return -ENODEV;
+ }
+
+ iwl_mvm_get_sync_time(mvm, CLOCK_REALTIME, &gp2, NULL, &sys_time);
+
+ iwl_mvm_ptp_update_new_read(mvm, gp2);
+
+ gp2_ns = (gp2 + (mvm->ptp_data.wrap_counter * IWL_PTP_GP2_WRAP)) *
+ NSEC_PER_USEC;
+
+ IWL_INFO(mvm, "Got Sync Time: GP2:%u, last_GP2: %u, GP2_ns: %lld, sys_time: %lld\n",
+ gp2, mvm->ptp_data.last_gp2, gp2_ns, (s64)sys_time);
+
+ /* System monotonic raw time is not used */
+ xtstamp->device = (ktime_t)gp2_ns;
+ xtstamp->sys_realtime = sys_time;
+
+ return 0;
+}
+
+static void iwl_mvm_ptp_work(struct work_struct *wk)
+{
+ struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm,
+ ptp_data.dwork.work);
+ u32 gp2;
+
+ mutex_lock(&mvm->mutex);
+ gp2 = iwl_mvm_get_systime(mvm);
+ iwl_mvm_ptp_update_new_read(mvm, gp2);
+ mutex_unlock(&mvm->mutex);
+}
+
+/* iwl_mvm_ptp_init - initialize PTP for devices which support it.
+ * @mvm: internal mvm structure, see &struct iwl_mvm.
+ *
+ * Performs the required steps for enabling PTP support.
+ */
+void iwl_mvm_ptp_init(struct iwl_mvm *mvm)
+{
+ /* Warn if the interface already has a ptp_clock defined */
+ if (WARN_ON(mvm->ptp_data.ptp_clock))
+ return;
+
+ mvm->ptp_data.ptp_clock_info.owner = THIS_MODULE;
+ mvm->ptp_data.ptp_clock_info.max_adj = 0x7fffffff;
+ mvm->ptp_data.ptp_clock_info.getcrosststamp =
+ iwl_mvm_phc_get_crosstimestamp;
+
+ /* Give a short 'friendly name' to identify the PHC clock */
+ snprintf(mvm->ptp_data.ptp_clock_info.name,
+ sizeof(mvm->ptp_data.ptp_clock_info.name),
+ "%s", "iwlwifi-PTP");
+
+ INIT_DELAYED_WORK(&mvm->ptp_data.dwork, iwl_mvm_ptp_work);
+
+ mvm->ptp_data.ptp_clock =
+ ptp_clock_register(&mvm->ptp_data.ptp_clock_info, mvm->dev);
+
+ if (IS_ERR(mvm->ptp_data.ptp_clock)) {
+ IWL_ERR(mvm, "Failed to register PHC clock (%ld)\n",
+ PTR_ERR(mvm->ptp_data.ptp_clock));
+ mvm->ptp_data.ptp_clock = NULL;
+ } else if (mvm->ptp_data.ptp_clock) {
+ IWL_INFO(mvm, "Registered PHC clock: %s, with index: %d\n",
+ mvm->ptp_data.ptp_clock_info.name,
+ ptp_clock_index(mvm->ptp_data.ptp_clock));
+ }
+}
+
+/* iwl_mvm_ptp_remove - disable PTP device.
+ * @mvm: internal mvm structure, see &struct iwl_mvm.
+ *
+ * Disable PTP support.
+ */
+void iwl_mvm_ptp_remove(struct iwl_mvm *mvm)
+{
+ if (mvm->ptp_data.ptp_clock) {
+ IWL_INFO(mvm, "Unregistering PHC clock: %s, with index: %d\n",
+ mvm->ptp_data.ptp_clock_info.name,
+ ptp_clock_index(mvm->ptp_data.ptp_clock));
+
+ ptp_clock_unregister(mvm->ptp_data.ptp_clock);
+ mvm->ptp_data.ptp_clock = NULL;
+ memset(&mvm->ptp_data.ptp_clock_info, 0,
+ sizeof(mvm->ptp_data.ptp_clock_info));
+ mvm->ptp_data.last_gp2 = 0;
+ cancel_delayed_work_sync(&mvm->ptp_data.dwork);
+ }
+}
--
2.38.1
