1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  linux/drivers/clocksource/timer-sp.c
5  *  Copyright (C) 1999 - 2003 ARM Limited
13 #include <linux/irq.h>
21 #include "timer-sp.h"
23 /* Hisilicon 64-bit timer(a variant of ARM SP804) */
66 		clk = clk_get_sys("sp804", name);  in sp804_get_clock_rate()
68 		pr_err("sp804: %s clock not found: %ld\n", name, PTR_ERR(clk));  in sp804_get_clock_rate()
74 		pr_err("sp804: clock failed to prepare: %d\n", err);  in sp804_get_clock_rate()
81 		pr_err("sp804: clock failed to enable: %d\n", err);  in sp804_get_clock_rate()
89 		pr_err("sp804: clock failed to get rate: %ld\n", rate);  in sp804_get_clock_rate()
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
161 static irqreturn_t sp804_timer_interrupt(int irq, void *dev_id)  in sp804_timer_interrupt()  argument
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()
219 int __init sp804_clockevents_init(void __iomem *base, unsigned int irq,  in sp804_clockevents_init()  argument
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()
237 	if (request_irq(irq, sp804_timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL,  in sp804_clockevents_init()
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()
272 	int irq, ret = -EINVAL;  in sp804_of_init()  local
278 		pr_debug("%pOF: skipping further SP804 timer device\n", np);  in sp804_of_init()
284 		return -ENXIO;  in sp804_of_init()
286 	timer1_base = base + timer->timer_base[0];  in sp804_of_init()
287 	timer2_base = base + timer->timer_base[1];  in sp804_of_init()
290 	writel(0, timer1_base + timer->ctrl);  in sp804_of_init()
291 	writel(0, timer2_base + timer->ctrl);  in sp804_of_init()
297 	/* Get the 2nd clock if the timer has 3 timer clocks */  in sp804_of_init()
301 			pr_err("sp804: %pOFn clock not found: %d\n", np,  in sp804_of_init()
308 	irq = irq_of_parse_and_map(np, 0);  in sp804_of_init()
309 	if (irq <= 0)  in sp804_of_init()
314 	of_property_read_u32(np, "arm,sp804-has-irq", &irq_num);  in sp804_of_init()
317 		ret = sp804_clockevents_init(timer2_base, irq, clk2, name);  in sp804_of_init()
327 		ret = sp804_clockevents_init(timer1_base, irq, clk1, name);  in sp804_of_init()
348 TIMER_OF_DECLARE(sp804, "arm,sp804", arm_sp804_of_init);
354 TIMER_OF_DECLARE(hisi_sp804, "hisilicon,sp804", hisi_sp804_of_init);
360 	int irq, ret = -EINVAL;  in integrator_cp_of_init()  local
367 		return -ENXIO;  in integrator_cp_of_init()
390 		irq = irq_of_parse_and_map(np, 0);  in integrator_cp_of_init()
391 		if (irq <= 0)  in integrator_cp_of_init()
394 		ret = sp804_clockevents_init(base, irq, clk, name);  in integrator_cp_of_init()
405 TIMER_OF_DECLARE(intcp, "arm,integrator-cp-timer", integrator_cp_of_init);