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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/03/02 12:30:39 UTC
[GitHub] [incubator-nuttx] gustavonihei opened a new pull request #5668: xtensa/esp32s3: Add support for Tickless kernel using Systimer
gustavonihei opened a new pull request #5668:
URL: https://github.com/apache/incubator-nuttx/pull/5668
## Summary
This PR intends to add support for Tickless operation of the NuttX kernel using the Systimer component.
## Impact
Extended OS support for `esp32s3-devkit` platform.
## Testing
Tested using `esp32s3-devkit:tickless`.
Boot into NSH and successful execution of `ostest`.
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[GitHub] [incubator-nuttx] pkarashchenko commented on a change in pull request #5668: xtensa/esp32s3: Add support for Tickless kernel using Systimer
Posted by GitBox <gi...@apache.org>.
pkarashchenko commented on a change in pull request #5668:
URL: https://github.com/apache/incubator-nuttx/pull/5668#discussion_r817666273
##########
File path: arch/xtensa/src/esp32s3/esp32s3_tickless.c
##########
@@ -0,0 +1,484 @@
+/****************************************************************************
+ * arch/xtensa/src/esp32s3/esp32s3_tickless.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Tickless OS Support.
+ *
+ * When CONFIG_SCHED_TICKLESS is enabled, all support for timer interrupts
+ * is suppressed and the platform specific code is expected to provide the
+ * following custom functions.
+ *
+ * void up_timer_initialize(void): Initializes the timer facilities.
+ * Called early in the initialization sequence (by up_initialize()).
+ * int up_timer_gettime(struct timespec *ts): Returns the current
+ * time from the platform specific time source.
+ * int up_timer_cancel(void): Cancels the interval timer.
+ * int up_timer_start(const struct timespec *ts): Start (or re-starts)
+ * the interval timer.
+ *
+ * The RTOS will provide the following interfaces for use by the platform-
+ * specific interval timer implementation:
+ *
+ * void sched_timer_expiration(void): Called by the platform-specific
+ * logic when the interval timer expires.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <time.h>
+#include <assert.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <nuttx/clock.h>
+#include <arch/board/board.h>
+#include <arch/irq.h>
+
+#include "xtensa.h"
+#include "chip.h"
+#include "esp32s3_irq.h"
+#include "hardware/esp32s3_systimer.h"
+#include "hardware/esp32s3_system.h"
+#include "hardware/esp32s3_soc.h"
+
+#ifdef CONFIG_SCHED_TICKLESS
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define ESP32S3_SYSTIMER_TICKS_PER_SEC (16 * 1000 * 1000)
+
+#define CTICK_PER_SEC (ESP32S3_SYSTIMER_TICKS_PER_SEC)
+#define CTICK_PER_USEC (CTICK_PER_SEC / USEC_PER_SEC)
+
+#define SEC_2_CTICK(s) ((s) * CTICK_PER_SEC)
+#define USEC_2_CTICK(us) ((us) * CTICK_PER_USEC)
+#define NSEC_2_CTICK(nsec) (((nsec) * CTICK_PER_USEC) / NSEC_PER_USEC)
+
+#define CTICK_2_SEC(tick) ((tick) / CTICK_PER_SEC)
+#define CTICK_2_USEC(tick) ((tick) / CTICK_PER_USEC)
+#define CTICK_2_NSEC(tick) ((tick) * 1000 / CTICK_PER_USEC)
+
+#define CPU_TICKS_MAX (UINT32_MAX / 4 * 3)
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static inline uint64_t up_tmr_getcounter(void);
+static inline uint64_t up_tmr_getalarmvalue(void);
+static void IRAM_ATTR up_tmr_setcounter(uint64_t ticks);
+static int IRAM_ATTR up_timer_expire(int irq, void *context, void *arg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static bool g_timer_started; /* Whether an interval timer is being started */
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_tmr_getcounter
+ *
+ * Description:
+ * Return the total ticks of system since power-on.
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * Total system ticks.
+ *
+ ****************************************************************************/
+
+static inline uint64_t up_tmr_getcounter(void)
Review comment:
Thank you
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[GitHub] [incubator-nuttx] pkarashchenko commented on a change in pull request #5668: xtensa/esp32s3: Add support for Tickless kernel using Systimer
Posted by GitBox <gi...@apache.org>.
pkarashchenko commented on a change in pull request #5668:
URL: https://github.com/apache/incubator-nuttx/pull/5668#discussion_r817661244
##########
File path: arch/xtensa/src/esp32s3/esp32s3_tickless.c
##########
@@ -0,0 +1,484 @@
+/****************************************************************************
+ * arch/xtensa/src/esp32s3/esp32s3_tickless.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Tickless OS Support.
+ *
+ * When CONFIG_SCHED_TICKLESS is enabled, all support for timer interrupts
+ * is suppressed and the platform specific code is expected to provide the
+ * following custom functions.
+ *
+ * void up_timer_initialize(void): Initializes the timer facilities.
+ * Called early in the initialization sequence (by up_initialize()).
+ * int up_timer_gettime(struct timespec *ts): Returns the current
+ * time from the platform specific time source.
+ * int up_timer_cancel(void): Cancels the interval timer.
+ * int up_timer_start(const struct timespec *ts): Start (or re-starts)
+ * the interval timer.
+ *
+ * The RTOS will provide the following interfaces for use by the platform-
+ * specific interval timer implementation:
+ *
+ * void sched_timer_expiration(void): Called by the platform-specific
+ * logic when the interval timer expires.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <time.h>
+#include <assert.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <nuttx/clock.h>
+#include <arch/board/board.h>
+#include <arch/irq.h>
+
+#include "xtensa.h"
+#include "chip.h"
+#include "esp32s3_irq.h"
+#include "hardware/esp32s3_systimer.h"
+#include "hardware/esp32s3_system.h"
+#include "hardware/esp32s3_soc.h"
+
+#ifdef CONFIG_SCHED_TICKLESS
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define ESP32S3_SYSTIMER_TICKS_PER_SEC (16 * 1000 * 1000)
+
+#define CTICK_PER_SEC (ESP32S3_SYSTIMER_TICKS_PER_SEC)
+#define CTICK_PER_USEC (CTICK_PER_SEC / USEC_PER_SEC)
+
+#define SEC_2_CTICK(s) ((s) * CTICK_PER_SEC)
+#define USEC_2_CTICK(us) ((us) * CTICK_PER_USEC)
+#define NSEC_2_CTICK(nsec) (((nsec) * CTICK_PER_USEC) / NSEC_PER_USEC)
+
+#define CTICK_2_SEC(tick) ((tick) / CTICK_PER_SEC)
+#define CTICK_2_USEC(tick) ((tick) / CTICK_PER_USEC)
+#define CTICK_2_NSEC(tick) ((tick) * 1000 / CTICK_PER_USEC)
+
+#define CPU_TICKS_MAX (UINT32_MAX / 4 * 3)
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static inline uint64_t up_tmr_getcounter(void);
+static inline uint64_t up_tmr_getalarmvalue(void);
+static void IRAM_ATTR up_tmr_setcounter(uint64_t ticks);
+static int IRAM_ATTR up_timer_expire(int irq, void *context, void *arg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static bool g_timer_started; /* Whether an interval timer is being started */
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_tmr_getcounter
+ *
+ * Description:
+ * Return the total ticks of system since power-on.
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * Total system ticks.
+ *
+ ****************************************************************************/
+
+static inline uint64_t up_tmr_getcounter(void)
Review comment:
why do you use `up_` notation for local functions?
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[GitHub] [incubator-nuttx] pkarashchenko merged pull request #5668: xtensa/esp32s3: Add support for Tickless kernel using Systimer
Posted by GitBox <gi...@apache.org>.
pkarashchenko merged pull request #5668:
URL: https://github.com/apache/incubator-nuttx/pull/5668
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[GitHub] [incubator-nuttx] gustavonihei commented on a change in pull request #5668: xtensa/esp32s3: Add support for Tickless kernel using Systimer
Posted by GitBox <gi...@apache.org>.
gustavonihei commented on a change in pull request #5668:
URL: https://github.com/apache/incubator-nuttx/pull/5668#discussion_r817665684
##########
File path: arch/xtensa/src/esp32s3/esp32s3_tickless.c
##########
@@ -0,0 +1,484 @@
+/****************************************************************************
+ * arch/xtensa/src/esp32s3/esp32s3_tickless.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Tickless OS Support.
+ *
+ * When CONFIG_SCHED_TICKLESS is enabled, all support for timer interrupts
+ * is suppressed and the platform specific code is expected to provide the
+ * following custom functions.
+ *
+ * void up_timer_initialize(void): Initializes the timer facilities.
+ * Called early in the initialization sequence (by up_initialize()).
+ * int up_timer_gettime(struct timespec *ts): Returns the current
+ * time from the platform specific time source.
+ * int up_timer_cancel(void): Cancels the interval timer.
+ * int up_timer_start(const struct timespec *ts): Start (or re-starts)
+ * the interval timer.
+ *
+ * The RTOS will provide the following interfaces for use by the platform-
+ * specific interval timer implementation:
+ *
+ * void sched_timer_expiration(void): Called by the platform-specific
+ * logic when the interval timer expires.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <time.h>
+#include <assert.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <nuttx/clock.h>
+#include <arch/board/board.h>
+#include <arch/irq.h>
+
+#include "xtensa.h"
+#include "chip.h"
+#include "esp32s3_irq.h"
+#include "hardware/esp32s3_systimer.h"
+#include "hardware/esp32s3_system.h"
+#include "hardware/esp32s3_soc.h"
+
+#ifdef CONFIG_SCHED_TICKLESS
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define ESP32S3_SYSTIMER_TICKS_PER_SEC (16 * 1000 * 1000)
+
+#define CTICK_PER_SEC (ESP32S3_SYSTIMER_TICKS_PER_SEC)
+#define CTICK_PER_USEC (CTICK_PER_SEC / USEC_PER_SEC)
+
+#define SEC_2_CTICK(s) ((s) * CTICK_PER_SEC)
+#define USEC_2_CTICK(us) ((us) * CTICK_PER_USEC)
+#define NSEC_2_CTICK(nsec) (((nsec) * CTICK_PER_USEC) / NSEC_PER_USEC)
+
+#define CTICK_2_SEC(tick) ((tick) / CTICK_PER_SEC)
+#define CTICK_2_USEC(tick) ((tick) / CTICK_PER_USEC)
+#define CTICK_2_NSEC(tick) ((tick) * 1000 / CTICK_PER_USEC)
+
+#define CPU_TICKS_MAX (UINT32_MAX / 4 * 3)
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static inline uint64_t up_tmr_getcounter(void);
+static inline uint64_t up_tmr_getalarmvalue(void);
+static void IRAM_ATTR up_tmr_setcounter(uint64_t ticks);
+static int IRAM_ATTR up_timer_expire(int irq, void *context, void *arg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static bool g_timer_started; /* Whether an interval timer is being started */
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_tmr_getcounter
+ *
+ * Description:
+ * Return the total ticks of system since power-on.
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * Total system ticks.
+ *
+ ****************************************************************************/
+
+static inline uint64_t up_tmr_getcounter(void)
Review comment:
Interesting question. This driver is a port from another ESP32 chip, the `up_` prefix didn't caught my attention before.
It seems pointless for these internal functions to be prefixed with `up_`. I will rename them.
Thanks.
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[GitHub] [incubator-nuttx] gustavonihei commented on a change in pull request #5668: xtensa/esp32s3: Add support for Tickless kernel using Systimer
Posted by GitBox <gi...@apache.org>.
gustavonihei commented on a change in pull request #5668:
URL: https://github.com/apache/incubator-nuttx/pull/5668#discussion_r817671140
##########
File path: arch/xtensa/src/esp32s3/esp32s3_tickless.c
##########
@@ -0,0 +1,484 @@
+/****************************************************************************
+ * arch/xtensa/src/esp32s3/esp32s3_tickless.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Tickless OS Support.
+ *
+ * When CONFIG_SCHED_TICKLESS is enabled, all support for timer interrupts
+ * is suppressed and the platform specific code is expected to provide the
+ * following custom functions.
+ *
+ * void up_timer_initialize(void): Initializes the timer facilities.
+ * Called early in the initialization sequence (by up_initialize()).
+ * int up_timer_gettime(struct timespec *ts): Returns the current
+ * time from the platform specific time source.
+ * int up_timer_cancel(void): Cancels the interval timer.
+ * int up_timer_start(const struct timespec *ts): Start (or re-starts)
+ * the interval timer.
+ *
+ * The RTOS will provide the following interfaces for use by the platform-
+ * specific interval timer implementation:
+ *
+ * void sched_timer_expiration(void): Called by the platform-specific
+ * logic when the interval timer expires.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <time.h>
+#include <assert.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <nuttx/clock.h>
+#include <arch/board/board.h>
+#include <arch/irq.h>
+
+#include "xtensa.h"
+#include "chip.h"
+#include "esp32s3_irq.h"
+#include "hardware/esp32s3_systimer.h"
+#include "hardware/esp32s3_system.h"
+#include "hardware/esp32s3_soc.h"
+
+#ifdef CONFIG_SCHED_TICKLESS
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define ESP32S3_SYSTIMER_TICKS_PER_SEC (16 * 1000 * 1000)
+
+#define CTICK_PER_SEC (ESP32S3_SYSTIMER_TICKS_PER_SEC)
+#define CTICK_PER_USEC (CTICK_PER_SEC / USEC_PER_SEC)
+
+#define SEC_2_CTICK(s) ((s) * CTICK_PER_SEC)
+#define USEC_2_CTICK(us) ((us) * CTICK_PER_USEC)
+#define NSEC_2_CTICK(nsec) (((nsec) * CTICK_PER_USEC) / NSEC_PER_USEC)
+
+#define CTICK_2_SEC(tick) ((tick) / CTICK_PER_SEC)
+#define CTICK_2_USEC(tick) ((tick) / CTICK_PER_USEC)
+#define CTICK_2_NSEC(tick) ((tick) * 1000 / CTICK_PER_USEC)
+
+#define CPU_TICKS_MAX (UINT32_MAX / 4 * 3)
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static inline uint64_t up_tmr_getcounter(void);
+static inline uint64_t up_tmr_getalarmvalue(void);
+static void IRAM_ATTR up_tmr_setcounter(uint64_t ticks);
+static int IRAM_ATTR up_timer_expire(int irq, void *context, void *arg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static bool g_timer_started; /* Whether an interval timer is being started */
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_tmr_getcounter
+ *
+ * Description:
+ * Return the total ticks of system since power-on.
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * Total system ticks.
+ *
+ ****************************************************************************/
+
+static inline uint64_t up_tmr_getcounter(void)
Review comment:
Done, renamed the private `up_tmr_` prefixed functions to `tickless_`.
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[GitHub] [incubator-nuttx] gustavonihei commented on a change in pull request #5668: xtensa/esp32s3: Add support for Tickless kernel using Systimer
Posted by GitBox <gi...@apache.org>.
gustavonihei commented on a change in pull request #5668:
URL: https://github.com/apache/incubator-nuttx/pull/5668#discussion_r817671140
##########
File path: arch/xtensa/src/esp32s3/esp32s3_tickless.c
##########
@@ -0,0 +1,484 @@
+/****************************************************************************
+ * arch/xtensa/src/esp32s3/esp32s3_tickless.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Tickless OS Support.
+ *
+ * When CONFIG_SCHED_TICKLESS is enabled, all support for timer interrupts
+ * is suppressed and the platform specific code is expected to provide the
+ * following custom functions.
+ *
+ * void up_timer_initialize(void): Initializes the timer facilities.
+ * Called early in the initialization sequence (by up_initialize()).
+ * int up_timer_gettime(struct timespec *ts): Returns the current
+ * time from the platform specific time source.
+ * int up_timer_cancel(void): Cancels the interval timer.
+ * int up_timer_start(const struct timespec *ts): Start (or re-starts)
+ * the interval timer.
+ *
+ * The RTOS will provide the following interfaces for use by the platform-
+ * specific interval timer implementation:
+ *
+ * void sched_timer_expiration(void): Called by the platform-specific
+ * logic when the interval timer expires.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <time.h>
+#include <assert.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <nuttx/clock.h>
+#include <arch/board/board.h>
+#include <arch/irq.h>
+
+#include "xtensa.h"
+#include "chip.h"
+#include "esp32s3_irq.h"
+#include "hardware/esp32s3_systimer.h"
+#include "hardware/esp32s3_system.h"
+#include "hardware/esp32s3_soc.h"
+
+#ifdef CONFIG_SCHED_TICKLESS
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define ESP32S3_SYSTIMER_TICKS_PER_SEC (16 * 1000 * 1000)
+
+#define CTICK_PER_SEC (ESP32S3_SYSTIMER_TICKS_PER_SEC)
+#define CTICK_PER_USEC (CTICK_PER_SEC / USEC_PER_SEC)
+
+#define SEC_2_CTICK(s) ((s) * CTICK_PER_SEC)
+#define USEC_2_CTICK(us) ((us) * CTICK_PER_USEC)
+#define NSEC_2_CTICK(nsec) (((nsec) * CTICK_PER_USEC) / NSEC_PER_USEC)
+
+#define CTICK_2_SEC(tick) ((tick) / CTICK_PER_SEC)
+#define CTICK_2_USEC(tick) ((tick) / CTICK_PER_USEC)
+#define CTICK_2_NSEC(tick) ((tick) * 1000 / CTICK_PER_USEC)
+
+#define CPU_TICKS_MAX (UINT32_MAX / 4 * 3)
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static inline uint64_t up_tmr_getcounter(void);
+static inline uint64_t up_tmr_getalarmvalue(void);
+static void IRAM_ATTR up_tmr_setcounter(uint64_t ticks);
+static int IRAM_ATTR up_timer_expire(int irq, void *context, void *arg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static bool g_timer_started; /* Whether an interval timer is being started */
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_tmr_getcounter
+ *
+ * Description:
+ * Return the total ticks of system since power-on.
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * Total system ticks.
+ *
+ ****************************************************************************/
+
+static inline uint64_t up_tmr_getcounter(void)
Review comment:
Done, renamed the private `up_` prefixed functions to `tickless_`.
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