3  * SPDX-License-Identifier: Apache-2.0
9 #include <zephyr/drivers/timer/system_timer.h>
10 #include <zephyr/dt-bindings/interrupt-controller/ite-intc.h>
17 LOG_MODULE_REGISTER(timer, LOG_LEVEL_ERR);
19 #define COUNT_1US (EC_FREQ / USEC_PER_SEC - 1)
22 	     "ITE RTOS timer HW frequency is fixed at 32768Hz");
24 /* Event timer configurations */
28 /* Event timer max count is 512 sec (base on clock source 32768Hz) */
31 /* Busy wait low timer configurations */
36 /* Busy wait high timer configurations */
40 /* Busy wait high timer max count is 71.58min (base on clock source 1MHz) */
44 const int32_t z_sys_timer_irq_for_test = DT_IRQ_BY_IDX(DT_NODELABEL(timer), 5, irq);
49  * One shot timer configurations
63  * One system (kernel) tick is as how much HW timer counts
65  * NOTE: Event and free run timer individually select the same clock source
72 /* Event timer max count is as how much system (kernel) tick */
110 	 * so disabled one shot timer interrupt.  in timer_5ms_one_shot_isr()
116  * This timer is used to wake up chip from sleep mode to complete
124 	/* Initialize interrupt handler of one shot timer */  in timer_5ms_one_shot()
128 	/* Set rising edge triggered of one shot timer */  in timer_5ms_one_shot()
131 	/* Clear interrupt status of one shot timer */  in timer_5ms_one_shot()
134 	/* Set clock source of one shot timer */  in timer_5ms_one_shot()
135 	timer2_reg->ET2PSR = EXT_PSR_32P768K;  in timer_5ms_one_shot()
138 	 * Set count of one shot timer,  in timer_5ms_one_shot()
139 	 * and after write ET2CNTLLR timer will start  in timer_5ms_one_shot()
142 	timer2_reg->ET2CNTLH2R = (uint8_t)((hw_cnt >> 16) & 0xff);  in timer_5ms_one_shot()
143 	timer2_reg->ET2CNTLHR = (uint8_t)((hw_cnt >> 8) & 0xff);  in timer_5ms_one_shot()
144 	timer2_reg->ET2CNTLLR = (uint8_t)(hw_cnt & 0xff);  in timer_5ms_one_shot()
160 	usec_to_wait--;  in arch_busy_wait()
163 		if ((IT8XXX2_EXT_CNTOX(BUSY_WAIT_H_TIMER) - start) >= usec_to_wait) {  in arch_busy_wait()
172 	/* Enable and re-start event timer */  in evt_timer_enable()
181 	/* Disable event timer */  in evt_timer_isr()
183 	/* W/C event timer interrupt status */  in evt_timer_isr()
191 		uint32_t dticks = (~(IT8XXX2_EXT_CNTOX(FREE_RUN_TIMER)) -  in evt_timer_isr()
199 		/* enable event timer */  in evt_timer_isr()
214 	 * TODO: to increment 32-bit "top half" here for software 64-bit  in free_run_timer_overflow_isr()
215 	 * timer emulation.  in free_run_timer_overflow_isr()
226 		/* Always return for non-tickless kernel system */  in sys_clock_set_timeout()
233 	/* Disable event timer */  in sys_clock_set_timeout()
239 		 * 1.CONFIG_SYSTEM_CLOCK_SLOPPY_IDLE = y (no future timer interrupts  in sys_clock_set_timeout()
256 		 * in the future. So set event timer count to 1 HW tick.  in sys_clock_set_timeout()
265 			dcycles = next_cycs - now;  in sys_clock_set_timeout()
270 	/* Set event timer 24-bit count */  in sys_clock_set_timeout()
273 	/* W/C event timer interrupt status */  in sys_clock_set_timeout()
276 	/* enable event timer */  in sys_clock_set_timeout()
287 		/* Always return 0 for non-tickless kernel system */  in sys_clock_elapsed()
297 	uint32_t dticks = (~(IT8XXX2_EXT_CNTOX(FREE_RUN_TIMER)) -  in sys_clock_elapsed()
311 	 * NOTE: Timer is counting down from 0xffffffff. In not combined  in sys_clock_cycle_get_32()
346 			LOG_ERR("Timer %d clock source error !", ext_timer);  in timer_init()
347 			return -1;  in timer_init()
352 		LOG_ERR("Timer %d count shouldn't be 0 !", ext_timer);  in timer_init()
353 		return -1;  in timer_init()
357 		/* Enable and re-start external timer x */  in timer_init()
360 		/* Disable external timer x */  in timer_init()
364 	/* Set rising edge triggered of external timer x */  in timer_init()
367 	/* Clear interrupt status of external timer x */  in timer_init()
370 	/* Set clock source of external timer x */  in timer_init()
373 	/* Set count of external timer x */  in timer_init()
376 	/* Disable external timer x */  in timer_init()
379 		/* Enable and re-start external timer x */  in timer_init()
398 	/* Enable 32-bit free run timer overflow interrupt */  in sys_clock_driver_init()
401 	/* Set 32-bit timer4 for free run*/  in sys_clock_driver_init()
407 		LOG_ERR("Init free run timer failed");  in sys_clock_driver_init()
411 	/* Set 24-bit timer3 for timeout event */  in sys_clock_driver_init()
419 		/* Start a event timer in one system tick */  in sys_clock_driver_init()
427 		LOG_ERR("Init event timer failed");  in sys_clock_driver_init()
435 		/* Set 32-bit timer6 to count-- every 1us */  in sys_clock_driver_init()
441 			LOG_ERR("Init busy wait high timer failed");  in sys_clock_driver_init()
446 		 * Set 24-bit timer5 to overflow every 1us  in sys_clock_driver_init()
449 		 *       and timer5 will automatically re-start counting down  in sys_clock_driver_init()
459 			LOG_ERR("Init busy wait low timer failed");  in sys_clock_driver_init()