1 // SPDX-License-Identifier: GPL-2.0
32 static struct kona_bcm_timers timers;  variable
37  * We use the peripheral timers for system tick, the cpu global timer for
65 	 * Read 64-bit free running counter  in kona_timer_get_counter()
66 	 * 1. Read hi-word  in kona_timer_get_counter()
67 	 * 2. Read low-word  in kona_timer_get_counter()
68 	 * 3. Read hi-word again  in kona_timer_get_counter()
70 	 *      if new hi-word is not equal to previously read hi-word, then  in kona_timer_get_counter()
73 	 *      if new hi-word is equal to previously read hi-word then stop.  in kona_timer_get_counter()
81 	} while (--loop_limit);  in kona_timer_get_counter()
85 		return -ETIMEDOUT;  in kona_timer_get_counter()
96 	 * so, here we reload the next event value and re-enable  in kona_timer_set_next_event()
100 	 * timer-interrupt->set_next_event. CPU local timers, when  in kona_timer_set_next_event()
108 	ret = kona_timer_get_counter(timers.tmr_regs, &msw, &lsw);  in kona_timer_set_next_event()
113 	writel(lsw + clc, timers.tmr_regs + KONA_GPTIMER_STCM0_OFFSET);  in kona_timer_set_next_event()
116 	reg = readl(timers.tmr_regs + KONA_GPTIMER_STCS_OFFSET);  in kona_timer_set_next_event()
118 	writel(reg, timers.tmr_regs + KONA_GPTIMER_STCS_OFFSET);  in kona_timer_set_next_event()
125 	kona_timer_disable_and_clear(timers.tmr_regs);  in kona_timer_shutdown()
148 	kona_timer_disable_and_clear(timers.tmr_regs);  in kona_timer_interrupt()
149 	evt->event_handler(evt);  in kona_timer_interrupt()
163 	} else if (!of_property_read_u32(node, "clock-frequency", &freq)) {  in kona_timer_init()
166 		pr_err("Kona Timer v1 unable to determine clock-frequency\n");  in kona_timer_init()
167 		return -EINVAL;  in kona_timer_init()
171 	timers.tmr_irq = irq_of_parse_and_map(node, 0);  in kona_timer_init()
174 	timers.tmr_regs = of_iomap(node, 0);  in kona_timer_init()
176 	kona_timer_disable_and_clear(timers.tmr_regs);  in kona_timer_init()
179 	if (request_irq(timers.tmr_irq, kona_timer_interrupt, IRQF_TIMER,  in kona_timer_init()
187 TIMER_OF_DECLARE(brcm_kona, "brcm,kona-timer", kona_timer_init);
189  * bcm,kona-timer is deprecated by brcm,kona-timer
192 TIMER_OF_DECLARE(bcm_kona, "bcm,kona-timer", kona_timer_init);