1 // SPDX-License-Identifier: GPL-2.0
3  * J-Core SoC PIT/clocksource driver
5  * Copyright (C) 2015-2016 Smart Energy Instruments, Inc.
64 	writel(0, pit->base + REG_PITEN);  in jcore_pit_disable()
71 	writel(delta, pit->base + REG_THROT);  in jcore_pit_set()
72 	writel(pit->enable_val, pit->base + REG_PITEN);  in jcore_pit_set()
94 	return jcore_pit_set(pit->periodic_delta, pit);  in jcore_pit_set_state_periodic()
110 	pr_info("Local J-Core PIT init on cpu %u\n", cpu);  in jcore_pit_local_init()
112 	buspd = readl(pit->base + REG_BUSPD);  in jcore_pit_local_init()
114 	pit->periodic_delta = DIV_ROUND_CLOSEST(NSEC_PER_SEC, HZ * buspd);  in jcore_pit_local_init()
116 	clockevents_config_and_register(&pit->ced, freq, 1, ULONG_MAX);  in jcore_pit_local_init()
125 	if (clockevent_state_oneshot(&pit->ced))  in jcore_timer_interrupt()
128 	pit->ced.event_handler(&pit->ced);  in jcore_timer_interrupt()
142 		pr_err("Error: Cannot map base address for J-Core PIT\n");  in jcore_pit_init()
143 		return -ENXIO;  in jcore_pit_init()
148 		pr_err("Error: J-Core PIT has no IRQ\n");  in jcore_pit_init()
149 		return -ENXIO;  in jcore_pit_init()
152 	pr_info("Initializing J-Core PIT at %p IRQ %d\n",  in jcore_pit_init()
168 		return -ENOMEM;  in jcore_pit_init()
180 	 * The J-Core PIT is not hard-wired to a particular IRQ, but  in jcore_pit_init()
189 	 * p is priority, and i is hard irq number.  in jcore_pit_init()
192 	 * any hard irq (trap number) can be programmed via the 8  in jcore_pit_init()
193 	 * iiiiiiii bits, and a priority (0-15) is programmable  in jcore_pit_init()
199 	 * traps 64-127 (the ones actually intended to be used for  in jcore_pit_init()
208 	hwirq = irq_get_irq_data(pit_irq)->hwirq;  in jcore_pit_init()
217 		pit->base = of_iomap(node, cpu);  in jcore_pit_init()
218 		if (!pit->base) {  in jcore_pit_init()
223 		pit->ced.name = "jcore_pit";  in jcore_pit_init()
224 		pit->ced.features = CLOCK_EVT_FEAT_PERIODIC  in jcore_pit_init()
227 		pit->ced.cpumask = cpumask_of(cpu);  in jcore_pit_init()
228 		pit->ced.rating = 400;  in jcore_pit_init()
229 		pit->ced.irq = pit_irq;  in jcore_pit_init()
230 		pit->ced.set_state_shutdown = jcore_pit_set_state_shutdown;  in jcore_pit_init()
231 		pit->ced.set_state_periodic = jcore_pit_set_state_periodic;  in jcore_pit_init()
232 		pit->ced.set_state_oneshot = jcore_pit_set_state_oneshot;  in jcore_pit_init()
233 		pit->ced.set_next_event = jcore_pit_set_next_event;  in jcore_pit_init()
235 		pit->enable_val = enable_val;  in jcore_pit_init()