1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  linux/drivers/clocksource/timer-sp.c
5  *  Copyright (C) 1999 - 2003 ARM Limited
21 #include "timer-sp.h"
23 /* Hisilicon 64-bit timer(a variant of ARM SP804) */
44 	.width		= 32,
55 	.width		= 64,
117 	return ~readl_relaxed(sched_clkevt->value);  in sp804_read()
130 		return -EINVAL;  in sp804_clocksource_and_sched_clock_init()
134 	writel(0, clkevt->ctrl);  in sp804_clocksource_and_sched_clock_init()
135 	writel(0xffffffff, clkevt->load);  in sp804_clocksource_and_sched_clock_init()
136 	writel(0xffffffff, clkevt->value);  in sp804_clocksource_and_sched_clock_init()
137 	if (clkevt->width == 64) {  in sp804_clocksource_and_sched_clock_init()
138 		writel(0xffffffff, clkevt->load_h);  in sp804_clocksource_and_sched_clock_init()
139 		writel(0xffffffff, clkevt->value_h);  in sp804_clocksource_and_sched_clock_init()
142 		clkevt->ctrl);  in sp804_clocksource_and_sched_clock_init()
144 	clocksource_mmio_init(clkevt->value, name,  in sp804_clocksource_and_sched_clock_init()
159  * IRQ handler for the timer
166 	writel(1, common_clkevt->intclr);  in sp804_timer_interrupt()
168 	evt->event_handler(evt);  in sp804_timer_interrupt()
175 	writel(0, common_clkevt->ctrl);  in timer_shutdown()
190 	writel(common_clkevt->reload, common_clkevt->load);  in sp804_set_periodic()
191 	writel(ctrl, common_clkevt->ctrl);  in sp804_set_periodic()
201 	writel(next, common_clkevt->load);  in sp804_set_next_event()
202 	writel(ctrl, common_clkevt->ctrl);  in sp804_set_next_event()
227 		return -EINVAL;  in sp804_clockevents_init()
230 	common_clkevt->reload = DIV_ROUND_CLOSEST(rate, HZ);  in sp804_clockevents_init()
231 	evt->name = name;  in sp804_clockevents_init()
232 	evt->irq = irq;  in sp804_clockevents_init()
233 	evt->cpumask = cpu_possible_mask;  in sp804_clockevents_init()
235 	writel(0, common_clkevt->ctrl);  in sp804_clockevents_init()
238 			"timer", &sp804_clockevent))  in sp804_clockevents_init()
239 		pr_err("%s: request_irq() failed\n", "timer");  in sp804_clockevents_init()
245 static void __init sp804_clkevt_init(struct sp804_timer *timer, void __iomem *base)  in sp804_clkevt_init()  argument
253 		timer_base = base + timer->timer_base[i];  in sp804_clkevt_init()
255 		clkevt->base	= timer_base;  in sp804_clkevt_init()
256 		clkevt->load	= timer_base + timer->load;  in sp804_clkevt_init()
257 		clkevt->load_h	= timer_base + timer->load_h;  in sp804_clkevt_init()
258 		clkevt->value	= timer_base + timer->value;  in sp804_clkevt_init()
259 		clkevt->value_h	= timer_base + timer->value_h;  in sp804_clkevt_init()
260 		clkevt->ctrl	= timer_base + timer->ctrl;  in sp804_clkevt_init()
261 		clkevt->intclr	= timer_base + timer->intclr;  in sp804_clkevt_init()
262 		clkevt->width	= timer->width;  in sp804_clkevt_init()
266 static int __init sp804_of_init(struct device_node *np, struct sp804_timer *timer)  in sp804_of_init()  argument
272 	int irq, ret = -EINVAL;  in sp804_of_init()
279 		return -ENXIO;  in sp804_of_init()
281 	timer1_base = base + timer->timer_base[0];  in sp804_of_init()
282 	timer2_base = base + timer->timer_base[1];  in sp804_of_init()
285 	writel(0, timer1_base + timer->ctrl);  in sp804_of_init()
286 	writel(0, timer2_base + timer->ctrl);  in sp804_of_init()
289 		ret = -EINVAL;  in sp804_of_init()
297 	/* Get the 2nd clock if the timer has 3 timer clocks */  in sp804_of_init()
312 	sp804_clkevt_init(timer, base);  in sp804_of_init()
314 	of_property_read_u32(np, "arm,sp804-has-irq", &irq_num);  in sp804_of_init()
360 	int irq, ret = -EINVAL;  in integrator_cp_of_init()
367 		return -ENXIO;  in integrator_cp_of_init()
376 	/* Ensure timer is disabled */  in integrator_cp_of_init()
405 TIMER_OF_DECLARE(intcp, "arm,integrator-cp-timer", integrator_cp_of_init);