/**************************************************************************** * arch/arm/src/imxrt/imxrt_timerisr.c * * Copyright (C) 2018 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include "nvic.h" #include "clock/clock.h" #include "up_internal.h" #include "up_arch.h" #include "chip.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #warning REVISIT these clock settings /* Select MCU-specific settings * * The SysTick timer is driven by the output of the Main Clock (main_clk). */ #define IMXRT_SYSTICK_CLOCK BOARD_CPU_FREQUENCY /* The desired timer interrupt frequency is provided by the definition * CLK_TCK (see include/time.h). CLK_TCK defines the desired number of * system clock ticks per second. That value is a user configurable setting * that defaults to 100 (100 ticks per second = 10 MS interval). */ #define SYSTICK_RELOAD ((IMXRT_SYSTICK_CLOCK / CLK_TCK) - 1) /* The size of the reload field is 24 bits. Verify that the reload value * will fit in the reload register. */ #if SYSTICK_RELOAD > 0x00ffffff # error SYSTICK_RELOAD exceeds the range of the RELOAD register #endif /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static int imxrt_timerisr(int irq, uint32_t *regs, void *arg)' #ifdef CONFIG_PM static void up_pm_notify(struct pm_callback_s *cb, int dowmin, enum pm_state_e pmstate); static int up_pm_prepare(struct pm_callback_s *cb, int domain, enum pm_state_e pmstate); #endif /**************************************************************************** * Private Data ****************************************************************************/ #ifdef CONFIG_PM static struct pm_callback_s g_timer_pmcb = { .notify = up_pm_notify, .prepare = up_pm_prepare, }; #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Function: imxrt_timerisr * * Description: * The timer ISR will perform a variety of services for various portions * of the systems. * ****************************************************************************/ static int imxrt_timerisr(int irq, uint32_t *regs, void *arg) { /* Process timer interrupt */ sched_process_timer(); return 0; } /**************************************************************************** * Name: up_pm_notify * * Description: * Notify the driver of new power state. This callback is called after * all drivers have had the opportunity to prepare for the new power state. * * Input Parameters: * * cb - Returned to the driver. The driver version of the callback * structure may include additional, driver-specific state data at * the end of the structure. * * pmstate - Identifies the new PM state * * Returned Value: * None - The driver already agreed to transition to the low power * consumption state when when it returned OK to the prepare() call. * * ****************************************************************************/ #ifdef CONFIG_PM static void up_pm_notify(struct pm_callback_s *cb, int domain, enum pm_state_e pmstate) { switch (pmstate) { case(PM_NORMAL): { /* Logic for PM_NORMAL goes here */ } break; case(PM_IDLE): { /* Logic for PM_IDLE goes here */ } break; case(PM_STANDBY): { /* Logic for PM_STANDBY goes here */ } break; case(PM_SLEEP): { /* Logic for PM_SLEEP goes here */ } break; default: /* Should not get here */ break; } } #endif /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Function: arm_timer_initialize * * Description: * This function is called during start-up to initialize the timer * interrupt. * ****************************************************************************/ void arm_timer_initialize(void) { uint32_t regval; #ifdef CONFIG_PM int ret; #endif /* Configure SysTick to interrupt at the requested rate */ putreg32(SYSTICK_RELOAD, NVIC_SYSTICK_RELOAD); putreg32(0, NVIC_SYSTICK_CURRENT); /* Attach the timer interrupt vector */ (void)irq_attach(IMXRT_IRQ_SYSTICK, (xcpt_t)imxrt_timerisr, NULL); /* Enable SysTick interrupts */ regval = (NVIC_SYSTICK_CTRL_CLKSOURCE | NVIC_SYSTICK_CTRL_TICKINT | NVIC_SYSTICK_CTRL_ENABLE); putreg32(regval, NVIC_SYSTICK_CTRL); #ifdef CONFIG_PM /* Register to receive power management callbacks */ ret = pm_register(&g_timer_pmcb); DEBUGASSERT(ret == OK); UNUSED(ret); #endif /* And enable the timer interrupt */ up_enable_irq(IMXRT_IRQ_SYSTICK); }