1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  linux/drivers/clocksource/timer-sp.c
5  *  Copyright (C) 1999 - 2003 ARM Limited
16 #include <linux/irq.h>
24 #include "timer-sp.h"
26 /* Hisilicon 64-bit timer(a variant of ARM SP804) */
67 		clk = clk_get_sys("sp804", name);  in sp804_get_clock_rate()
102 	return ~readl_relaxed(sched_clkevt->value);  in sp804_read()
115 		return -EINVAL;  in sp804_clocksource_and_sched_clock_init()
119 	writel(0, clkevt->ctrl);  in sp804_clocksource_and_sched_clock_init()
120 	writel(0xffffffff, clkevt->load);  in sp804_clocksource_and_sched_clock_init()
121 	writel(0xffffffff, clkevt->value);  in sp804_clocksource_and_sched_clock_init()
122 	if (clkevt->width == 64) {  in sp804_clocksource_and_sched_clock_init()
123 		writel(0xffffffff, clkevt->load_h);  in sp804_clocksource_and_sched_clock_init()
124 		writel(0xffffffff, clkevt->value_h);  in sp804_clocksource_and_sched_clock_init()
127 		clkevt->ctrl);  in sp804_clocksource_and_sched_clock_init()
129 	clocksource_mmio_init(clkevt->value, name,  in sp804_clocksource_and_sched_clock_init()
144  * IRQ handler for the timer
146 static irqreturn_t sp804_timer_interrupt(int irq, void *dev_id)  in sp804_timer_interrupt()  argument
151 	writel(1, common_clkevt->intclr);  in sp804_timer_interrupt()
153 	evt->event_handler(evt);  in sp804_timer_interrupt()
160 	writel(0, common_clkevt->ctrl);  in evt_timer_shutdown()
175 	writel(common_clkevt->reload, common_clkevt->load);  in sp804_set_periodic()
176 	writel(ctrl, common_clkevt->ctrl);  in sp804_set_periodic()
186 	writel(next, common_clkevt->load);  in sp804_set_next_event()
187 	writel(ctrl, common_clkevt->ctrl);  in sp804_set_next_event()
204 static int __init sp804_clockevents_init(void __iomem *base, unsigned int irq,  in sp804_clockevents_init()  argument
212 		return -EINVAL;  in sp804_clockevents_init()
215 	common_clkevt->reload = DIV_ROUND_CLOSEST(rate, HZ);  in sp804_clockevents_init()
216 	evt->name = name;  in sp804_clockevents_init()
217 	evt->irq = irq;  in sp804_clockevents_init()
218 	evt->cpumask = cpu_possible_mask;  in sp804_clockevents_init()
220 	writel(0, common_clkevt->ctrl);  in sp804_clockevents_init()
222 	if (request_irq(irq, sp804_timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL,  in sp804_clockevents_init()
238 		timer_base = base + timer->timer_base[i];  in sp804_clkevt_init()
240 		clkevt->base	= timer_base;  in sp804_clkevt_init()
241 		clkevt->load	= timer_base + timer->load;  in sp804_clkevt_init()
242 		clkevt->load_h	= timer_base + timer->load_h;  in sp804_clkevt_init()
243 		clkevt->value	= timer_base + timer->value;  in sp804_clkevt_init()
244 		clkevt->value_h	= timer_base + timer->value_h;  in sp804_clkevt_init()
245 		clkevt->ctrl	= timer_base + timer->ctrl;  in sp804_clkevt_init()
246 		clkevt->intclr	= timer_base + timer->intclr;  in sp804_clkevt_init()
247 		clkevt->width	= timer->width;  in sp804_clkevt_init()
257 	int irq, ret = -EINVAL;  in sp804_of_init()  local
263 		pr_debug("%pOF: skipping further SP804 timer device\n", np);  in sp804_of_init()
269 		return -ENXIO;  in sp804_of_init()
271 	timer1_base = base + timer->timer_base[0];  in sp804_of_init()
272 	timer2_base = base + timer->timer_base[1];  in sp804_of_init()
275 	writel(0, timer1_base + timer->ctrl);  in sp804_of_init()
276 	writel(0, timer2_base + timer->ctrl);  in sp804_of_init()
282 	/* Get the 2nd clock if the timer has 3 timer clocks */  in sp804_of_init()
293 	irq = irq_of_parse_and_map(np, 0);  in sp804_of_init()
294 	if (irq <= 0)  in sp804_of_init()
299 	of_property_read_u32(np, "arm,sp804-has-irq", &irq_num);  in sp804_of_init()
302 		ret = sp804_clockevents_init(timer2_base, irq, clk2, name);  in sp804_of_init()
312 		ret = sp804_clockevents_init(timer1_base, irq, clk1, name);  in sp804_of_init()
333 TIMER_OF_DECLARE(sp804, "arm,sp804", arm_sp804_of_init);
339 TIMER_OF_DECLARE(hisi_sp804, "hisilicon,sp804", hisi_sp804_of_init);
345 	int irq, ret = -EINVAL;  in integrator_cp_of_init()  local
352 		return -ENXIO;  in integrator_cp_of_init()
375 		irq = irq_of_parse_and_map(np, 0);  in integrator_cp_of_init()
376 		if (irq <= 0)  in integrator_cp_of_init()
379 		ret = sp804_clockevents_init(base, irq, clk, name);  in integrator_cp_of_init()
390 TIMER_OF_DECLARE(intcp, "arm,integrator-cp-timer", integrator_cp_of_init);