drivers: timer: Add support for cc23x0 systim (10c35b8e) · Commits · Wenxi XU / zephyr

drivers/timer/CMakeLists.txt

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		@@ -12,6 +12,7 @@ zephyr_library_sources_ifdef(CONFIG_ARCV2_TIMER arcv2_timer0.c)
		zephyr_library_sources_ifdef(CONFIG_ARM_ARCH_TIMER arm_arch_timer.c)
		zephyr_library_sources_ifdef(CONFIG_INTEL_ADSP_TIMER intel_adsp_timer.c)
		zephyr_library_sources_ifdef(CONFIG_CC13XX_CC26XX_RTC_TIMER cc13xx_cc26xx_rtc_timer.c)
		zephyr_library_sources_ifdef(CONFIG_CC23X0_SYSTIM_TIMER cc23x0_systim_timer.c)
		zephyr_library_sources_ifdef(CONFIG_CH32V00X_SYSTICK wch_systick_ch32v00x.c)
		zephyr_library_sources_ifdef(CONFIG_CORTEX_M_SYSTICK cortex_m_systick.c)
		zephyr_library_sources_ifdef(CONFIG_ESP32_SYS_TIMER esp32_sys_timer.c)

drivers/timer/Kconfig

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		@@ -70,6 +70,7 @@ source "drivers/timer/Kconfig.arcv2"
		source "drivers/timer/Kconfig.arm_arch"
		source "drivers/timer/Kconfig.cavs"
		source "drivers/timer/Kconfig.cc13xx_cc26xx_rtc"
		source "drivers/timer/Kconfig.cc23x0_systim"
		source "drivers/timer/Kconfig.wch_ch32v00x"
		source "drivers/timer/Kconfig.cortex_m_systick"
		source "drivers/timer/Kconfig.esp32"

drivers/timer/Kconfig.cc23x0_systim

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		# Copyright (c) 2024 Texas Instruments Incorporated
		# Copyright (c) 2024 BayLibre, SAS
		#
		# SPDX-License-Identifier: Apache-2.0

		config CC23X0_SYSTIM_TIMER
		bool "TI SimpleLink CC23X0 system clock timer"
		default y
		depends on HAS_CC23X0_SDK
		select TICKLESS_CAPABLE
		help
		This module provides the "system clock driver" interfaces
		for the TI Simplelink CC23X0 devices.

drivers/timer/cc23x0_systim_timer.c

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		/*
		* Copyright (c) 2024 Texas Instruments Incorporated
		* Copyright (c) 2024 BayLibre, SAS
		*
		* SPDX-License-Identifier: Apache-2.0
		*/

		#define DT_DRV_COMPAT ti_cc23x0_systim_timer

		/*
		* TI SimpleLink CC23X0 timer driver based on SYSTIM
		*/

		#include <soc.h>

		#include <zephyr/device.h>
		#include <zephyr/drivers/clock_control.h>
		#include <zephyr/drivers/timer/system_timer.h>
		#include <zephyr/irq.h>
		#include <zephyr/spinlock.h>
		#include <zephyr/sys_clock.h>
		#include <zephyr/sys/util.h>

		#include <inc/hw_types.h>
		#include <inc/hw_memmap.h>
		#include <inc/hw_systim.h>
		#include <inc/hw_evtsvt.h>

		/* Kernel tick period in microseconds (same timebase as systim) */
		#define TICK_PERIOD_MICRO_SEC (1000000 / CONFIG_SYS_CLOCK_TICKS_PER_SEC)

		/*
		* Max number of systim ticks into the future
		*
		* Under the hood, the kernel timer uses the SysTimer whose events trigger
		* immediately if the compare value is less than 2^22 systimer ticks in the past
		* (4.194sec at 1us resolution). Therefore, the max number of SysTimer ticks you
		* can schedule into the future is 2^32 - 2^22 - 1 ticks (~= 4290 sec at 1us
		* resolution).
		*/
		#define SYSTIM_TIMEOUT_MAX 0xFFBFFFFFU

		/* Set systim interrupt to lowest priority */
		#define SYSTIM_ISR_PRIORITY 3U

		/* Keep track of systim counter at previous announcement to the kernel */
		static uint32_t last_systim_count;

		static void systim_isr(const void *arg);
		static int sys_clock_driver_init(void);

		/*
		* Set system clock timeout.
		*/
		void sys_clock_set_timeout(int32_t ticks, bool idle)
		{
		ARG_UNUSED(idle);

		/* If timeout is necessary */
		if (ticks != K_TICKS_FOREVER) {
		/* Get current value as early as possible */
		uint32_t now_tick = HWREG(SYSTIM_BASE + SYSTIM_O_TIME1U);
		uint32_t timeout = ticks * TICK_PERIOD_MICRO_SEC;

		if (timeout > SYSTIM_TIMEOUT_MAX) {
		timeout = SYSTIM_TIMEOUT_MAX;
		}
		/* This should wrap around */
		HWREG(SYSTIM_BASE + SYSTIM_O_CH0CC) = now_tick + timeout;
		}
		}

		uint32_t sys_clock_elapsed(void)
		{
		/* Get current value as early as possible */
		uint32_t current_systim_count = HWREG(SYSTIM_BASE + SYSTIM_O_TIME1U);
		uint32_t elapsed_systim;

		if (current_systim_count >= last_systim_count) {
		elapsed_systim = current_systim_count - last_systim_count;
		} else {
		elapsed_systim = (UINT32_MAX - last_systim_count) + current_systim_count;
		}

		int32_t elapsed_ticks = elapsed_systim / TICK_PERIOD_MICRO_SEC;

		return elapsed_ticks;
		}

		uint32_t sys_clock_cycle_get_32(void)
		{
		return HWREG(SYSTIM_BASE + SYSTIM_O_TIME1U);
		}

		void systim_isr(const void *arg)
		{
		/* Get current value as early as possible */
		uint32_t current_systim_count = HWREG(SYSTIM_BASE + SYSTIM_O_TIME1U);
		uint32_t elapsed_systim;

		if (current_systim_count >= last_systim_count) {
		elapsed_systim = current_systim_count - last_systim_count;
		} else {
		elapsed_systim = (UINT32_MAX - last_systim_count) + current_systim_count;
		}

		int32_t elapsed_ticks = elapsed_systim / TICK_PERIOD_MICRO_SEC;

		sys_clock_announce(elapsed_ticks);

		last_systim_count = current_systim_count;

		/* Do not re-arm systim. Zephyr will do so through sys_clock_set_timeout */
		}

		static int sys_clock_driver_init(void)
		{
		uint32_t now_tick;

		/* Get current value as early as possible */
		now_tick = HWREG(SYSTIM_BASE + SYSTIM_O_TIME1U);
		last_systim_count = now_tick;

		/* Clear any pending interrupts on SysTimer channel 0 */
		HWREG(SYSTIM_BASE + SYSTIM_O_ICLR) = SYSTIM_ICLR_EV0_CLR;

		/*
		* Configure SysTimer channel 0 to compare mode with timer
		* resolution of 1 us.
		*/
		HWREG(SYSTIM_BASE + SYSTIM_O_CH0CFG) = 0;

		/* Make SysTimer halt on CPU debug halt */
		HWREG(SYSTIM_BASE + SYSTIM_O_EMU) = SYSTIM_EMU_HALT_STOP;

		HWREG(EVTSVT_BASE + EVTSVT_O_CPUIRQ16SEL) = EVTSVT_CPUIRQ16SEL_PUBID_SYSTIM0;

		/*
		* Set IMASK for channel 0. IMASK is used by the power driver to know
		* which systimer channels are active.
		*/
		HWREG(SYSTIM_BASE + SYSTIM_O_IMSET) = SYSTIM_IMSET_EV0_SET;

		/* This should wrap around and set a maximum timeout */
		HWREG(SYSTIM_BASE + SYSTIM_O_CH0CC) = now_tick + SYSTIM_TIMEOUT_MAX;

		/* Take configurable interrupt IRQ16 for systimer */
		IRQ_CONNECT(CPUIRQ16_IRQn, SYSTIM_ISR_PRIORITY, systim_isr, 0, 0);
		irq_enable(CPUIRQ16_IRQn);

		return 0;
		}

		SYS_INIT(sys_clock_driver_init, PRE_KERNEL_2, CONFIG_SYSTEM_CLOCK_INIT_PRIORITY);

dts/bindings/timer/ti,cc23x0-timer.yaml

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		# Copyright (c) 2024 Baylibre SAS
		# SPDX-License-Identifier: Apache-2.0

		description: TI SimpleLink CC23x0 Timer Node

		compatible: "ti,cc23x0-systim-timer"

		include: base.yaml

		properties:
		reg:
		required: true

		interrupts:
		required: true

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