| /* |
| * Copyright (c) 2021 Vestas Wind Systems A/S |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define DT_DRV_COMPAT nxp_kinetis_lptmr |
| |
| #include <zephyr/device.h> |
| #include <zephyr/drivers/timer/system_timer.h> |
| #include <fsl_lptmr.h> |
| |
| BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) == 1, |
| "No LPTMR instance enabled in devicetree"); |
| |
| /* Prescaler mapping */ |
| #define LPTMR_PRESCALER_2 kLPTMR_Prescale_Glitch_0 |
| #define LPTMR_PRESCALER_4 kLPTMR_Prescale_Glitch_1 |
| #define LPTMR_PRESCALER_8 kLPTMR_Prescale_Glitch_2 |
| #define LPTMR_PRESCALER_16 kLPTMR_Prescale_Glitch_3 |
| #define LPTMR_PRESCALER_32 kLPTMR_Prescale_Glitch_4 |
| #define LPTMR_PRESCALER_64 kLPTMR_Prescale_Glitch_5 |
| #define LPTMR_PRESCALER_128 kLPTMR_Prescale_Glitch_6 |
| #define LPTMR_PRESCALER_256 kLPTMR_Prescale_Glitch_7 |
| #define LPTMR_PRESCALER_512 kLPTMR_Prescale_Glitch_8 |
| #define LPTMR_PRESCALER_1024 kLPTMR_Prescale_Glitch_9 |
| #define LPTMR_PRESCALER_2048 kLPTMR_Prescale_Glitch_10 |
| #define LPTMR_PRESCALER_4096 kLPTMR_Prescale_Glitch_11 |
| #define LPTMR_PRESCALER_8192 kLPTMR_Prescale_Glitch_12 |
| #define LPTMR_PRESCALER_16384 kLPTMR_Prescale_Glitch_13 |
| #define LPTMR_PRESCALER_32768 kLPTMR_Prescale_Glitch_14 |
| #define LPTMR_PRESCALER_65536 kLPTMR_Prescale_Glitch_15 |
| #define TO_LPTMR_PRESCALER(val) _DO_CONCAT(LPTMR_PRESCALER_, val) |
| |
| /* Prescaler clock mapping */ |
| #define TO_LPTMR_CLK_SEL(val) _DO_CONCAT(kLPTMR_PrescalerClock_, val) |
| |
| /* Devicetree properties */ |
| #define LPTMR_BASE ((LPTMR_Type *)(DT_INST_REG_ADDR(0))) |
| #define LPTMR_CLK_SOURCE TO_LPTMR_CLK_SEL(DT_INST_PROP(0, clk_source)); |
| #define LPTMR_PRESCALER TO_LPTMR_PRESCALER(DT_INST_PROP(0, prescaler)); |
| #define LPTMR_BYPASS_PRESCALER DT_INST_PROP(0, prescaler) == 1 |
| #define LPTMR_IRQN DT_INST_IRQN(0) |
| #define LPTMR_IRQ_PRIORITY DT_INST_IRQ(0, priority) |
| |
| /* Timer cycles per tick */ |
| #define CYCLES_PER_TICK ((uint32_t)((uint64_t)sys_clock_hw_cycles_per_sec() \ |
| / (uint64_t)CONFIG_SYS_CLOCK_TICKS_PER_SEC)) |
| |
| /* 32 bit cycle counter */ |
| static volatile uint32_t cycles; |
| |
| void sys_clock_set_timeout(int32_t ticks, bool idle) |
| { |
| ARG_UNUSED(idle); |
| |
| if (idle && (ticks == K_TICKS_FOREVER)) { |
| LPTMR_DisableInterrupts(LPTMR_BASE, kLPTMR_TimerInterruptEnable); |
| } |
| } |
| |
| void sys_clock_idle_exit(void) |
| { |
| if (LPTMR_GetEnabledInterrupts(LPTMR_BASE) != kLPTMR_TimerInterruptEnable) { |
| LPTMR_EnableInterrupts(LPTMR_BASE, kLPTMR_TimerInterruptEnable); |
| } |
| } |
| |
| void sys_clock_disable(void) |
| { |
| LPTMR_DisableInterrupts(LPTMR_BASE, kLPTMR_TimerInterruptEnable); |
| LPTMR_StopTimer(LPTMR_BASE); |
| } |
| |
| uint32_t sys_clock_elapsed(void) |
| { |
| return 0; |
| } |
| |
| uint32_t sys_clock_cycle_get_32(void) |
| { |
| return LPTMR_GetCurrentTimerCount(LPTMR_BASE) + cycles; |
| } |
| |
| static void mcux_lptmr_timer_isr(const void *arg) |
| { |
| ARG_UNUSED(arg); |
| |
| cycles += CYCLES_PER_TICK; |
| |
| sys_clock_announce(1); |
| LPTMR_ClearStatusFlags(LPTMR_BASE, kLPTMR_TimerCompareFlag); |
| } |
| |
| static int sys_clock_driver_init(const struct device *dev) |
| { |
| lptmr_config_t config; |
| |
| ARG_UNUSED(dev); |
| |
| LPTMR_GetDefaultConfig(&config); |
| config.timerMode = kLPTMR_TimerModeTimeCounter; |
| config.enableFreeRunning = false; |
| config.prescalerClockSource = LPTMR_CLK_SOURCE; |
| |
| #if LPTMR_BYPASS_PRESCALER |
| config.bypassPrescaler = true; |
| #else /* LPTMR_BYPASS_PRESCALER */ |
| config.bypassPrescaler = false; |
| config.value = LPTMR_PRESCALER; |
| #endif /* !LPTMR_BYPASS_PRESCALER */ |
| |
| LPTMR_Init(LPTMR_BASE, &config); |
| |
| IRQ_CONNECT(LPTMR_IRQN, LPTMR_IRQ_PRIORITY, mcux_lptmr_timer_isr, NULL, 0); |
| irq_enable(LPTMR_IRQN); |
| |
| LPTMR_EnableInterrupts(LPTMR_BASE, kLPTMR_TimerInterruptEnable); |
| LPTMR_SetTimerPeriod(LPTMR_BASE, CYCLES_PER_TICK); |
| LPTMR_StartTimer(LPTMR_BASE); |
| |
| return 0; |
| } |
| |
| SYS_INIT(sys_clock_driver_init, PRE_KERNEL_2, |
| CONFIG_SYSTEM_CLOCK_INIT_PRIORITY); |