sys/ztimer: add periph_ptp backend

sys/include/ztimer/periph_ptp.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C)    2018 Kaspar Schleiser <kaspar@schleiser.de>
+                    2021 Otto-von-Guericke-Universität Magdeburg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License v2.1. See the file LICENSE in the top level directory for more
+ * details.
+ */
+
+/**
+ * @defgroup    sys_ztimer_periph_ptp  ztimer periph/ptp backend
+ * @ingroup     sys_ztimer
+ * @brief       ztimer periph/ptp backend
+ *
+ * This ztimer module implements a ztimer virtual clock on top of periph/ptp.
+ *
+ * @{
+ *
+ * @file
+ * @brief       ztimer periph/ptp backend API
+ *
+ * @author      Jana Eisoldt <jana.eisoldt@ovgu.de>
+ */
+
+#ifndef ZTIMER_PERIPH_PTP_H
+#define ZTIMER_PERIPH_PTP_H
+
+#include "ztimer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief ztimer_periph_ptp structure definition
+ *
+ * The periph/ptp backend has no private fields, thus this is just a typedef
+ * to ztimer_clock_t.
+ */
+typedef ztimer_clock_t ztimer_periph_ptp_t;
+
+/**
+ * @brief   ztimer periph/ptp backend initialization function
+ *
+ * @param[in, out]  clock   ztimer_periph_ptp object to initialize
+ */
+void ztimer_periph_ptp_init(ztimer_periph_ptp_t *clock);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZTIMER_PERIPH_PTP_H */
+/** @} */

sys/ztimer/Kconfig

@@ -28,6 +28,11 @@ config MODULE_ZTIMER_PERIPH_RTT
     select MODULE_PERIPH_RTT
     default y if !MODULE_ZTIMER_PERIPH_TIMER
 
+config MODULE_ZTIMER_PERIPH_PTP
+    bool "PTP peripheral"
+    depends on HAS_PERIPH_PTP_TIMER
+    select MODULE_PERIPH_PTP_TIMER
+
 config MODULE_ZTIMER_PERIPH_TIMER
     bool "Timer peripheral"
     depends on HAS_PERIPH_TIMER

sys/ztimer/Makefile.dep

@@ -70,6 +70,10 @@ ifneq (,$(filter ztimer_periph_rtt,$(USEMODULE)))
   FEATURES_REQUIRED += periph_rtt
 endif
 
+ifneq (,$(filter ztimer_periph_ptp,$(USEMODULE)))
+  FEATURES_REQUIRED += periph_ptp_timer
+endif
+
 ifneq (,$(filter ztimer_convert_frac,$(USEMODULE)))
   USEMODULE += frac
 endif

sys/ztimer/periph_ptp.c

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C)    2018 Kaspar Schleiser <kaspar@schleiser.de>
+                    2021 Otto-von-Guericke-Universität Magdeburg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License v2.1. See the file LICENSE in the top level directory for more
+ * details.
+ */
+
+/**
+ * @ingroup     sys_ztimer_periph_ptp
+ * @{
+ *
+ * @file
+ * @brief       ztimer periph/ptp implementation
+ *
+ * @author      Jana Eisoldt <jana.eisoldt@ovgu.de>
+ *
+ * @}
+ */
+#include "assert.h"
+
+#include "irq.h"
+#include "periph/ptp.h"
+#include "ztimer/periph_ptp.h"
+
+#define ENABLE_DEBUG 0
+#include "debug.h"
+
+static ztimer_clock_t *clock_timer;
+
+void ptp_timer_cb(void)
+{
+    ztimer_handler(clock_timer);
+}
+
+static void _ztimer_periph_ptp_set(ztimer_clock_t *clock, uint32_t val)
+{
+    (void)clock;
+    ptp_timer_set_u64(val);
+}
+
+static uint32_t _ztimer_periph_ptp_now(ztimer_clock_t *clock)
+{
+    (void)clock;
+    return (uint32_t)ptp_clock_read_u64();
+}
+
+static void _ztimer_periph_ptp_cancel(ztimer_clock_t *clock)
+{
+    (void)clock;
+    ptp_timer_clear();
+}
+
+static const ztimer_ops_t _ztimer_periph_ptp_ops = {
+    .set = _ztimer_periph_ptp_set,
+    .now = _ztimer_periph_ptp_now,
+    .cancel = _ztimer_periph_ptp_cancel,
+};
+
+void ztimer_periph_ptp_init(ztimer_periph_ptp_t *clock)
+{
+    clock->ops = &_ztimer_periph_ptp_ops;
+    clock->max_value = UINT32_MAX;
+    clock_timer = clock;
+
+    ztimer_init_extend(clock);
+}