// SPDX-License-Identifier: GPL-2.0+/* * RDA8810PL SoC timer driver * * Copyright RDA Microelectronics Company Limited * Copyright (c) 2017 Andreas Färber * Copyright (c) 2018 Manivannan Sadhasivam * * RDA8810PL has two independent timers: OSTIMER (56 bit) and HWTIMER (64 bit). * Each timer provides optional interrupt support. In this driver, OSTIMER is * used for clockevents and HWTIMER is used for clocksource. */ #include <linux/init.h>#include <linux/interrupt.h> #include "timer-of.h" #define RDA_OSTIMER_LOADVAL_L	0x000#define RDA_OSTIMER_CTRL	0x004#define RDA_HWTIMER_LOCKVAL_L	0x024#define RDA_HWTIMER_LOCKVAL_H	0x028#define RDA_TIMER_IRQ_MASK_SET	0x02c#define RDA_TIMER_IRQ_MASK_CLR	0x030#define RDA_TIMER_IRQ_CLR	0x034 #define RDA_OSTIMER_CTRL_ENABLE		BIT(24)#define RDA_OSTIMER_CTRL_REPEAT		BIT(28)#define RDA_OSTIMER_CTRL_LOAD		BIT(30) #define RDA_TIMER_IRQ_MASK_OSTIMER	BIT(0) #define RDA_TIMER_IRQ_CLR_OSTIMER	BIT(0) static int rda_ostimer_start(void __iomem *base, bool periodic, u64 cycles){	u32 ctrl, load_l; 	load_l = (u32)cycles;	ctrl = ((cycles >> 32) & 0xffffff);	ctrl |= RDA_OSTIMER_CTRL_LOAD | RDA_OSTIMER_CTRL_ENABLE;	if (periodic)		ctrl |= RDA_OSTIMER_CTRL_REPEAT; 	/* Enable ostimer interrupt first */	writel_relaxed(RDA_TIMER_IRQ_MASK_OSTIMER,		       base + RDA_TIMER_IRQ_MASK_SET); 	/* Write low 32 bits first, high 24 bits are with ctrl */	writel_relaxed(load_l, base + RDA_OSTIMER_LOADVAL_L);	writel_relaxed(ctrl, base + RDA_OSTIMER_CTRL); 	return 0;} static int rda_ostimer_stop(void __iomem *base){	/* Disable ostimer interrupt first */	writel_relaxed(RDA_TIMER_IRQ_MASK_OSTIMER,		       base + RDA_TIMER_IRQ_MASK_CLR); 	writel_relaxed(0, base + RDA_OSTIMER_CTRL); 	return 0;} static int rda_ostimer_set_state_shutdown(struct clock_event_device *evt){	struct timer_of *to = to_timer_of(evt); 	rda_ostimer_stop(timer_of_base(to)); 	return 0;} static int rda_ostimer_set_state_oneshot(struct clock_event_device *evt){	struct timer_of *to = to_timer_of(evt); 	rda_ostimer_stop(timer_of_base(to)); 	return 0;} static int rda_ostimer_set_state_periodic(struct clock_event_device *evt){	struct timer_of *to = to_timer_of(evt);	unsigned long cycles_per_jiffy; 	rda_ostimer_stop(timer_of_base(to)); 	cycles_per_jiffy = ((unsigned long long)NSEC_PER_SEC / HZ *			     evt->mult) >> evt->shift;	rda_ostimer_start(timer_of_base(to), true, cycles_per_jiffy); 	return 0;} static int rda_ostimer_tick_resume(struct clock_event_device *evt){	return 0;} static int rda_ostimer_set_next_event(unsigned long evt,				      struct clock_event_device *ev){	struct timer_of *to = to_timer_of(ev); 	rda_ostimer_start(timer_of_base(to), false, evt); 	return 0;} static irqreturn_t rda_ostimer_interrupt(int irq, void *dev_id){	struct clock_event_device *evt = dev_id;	struct timer_of *to = to_timer_of(evt); 	/* clear timer int */	writel_relaxed(RDA_TIMER_IRQ_CLR_OSTIMER,		       timer_of_base(to) + RDA_TIMER_IRQ_CLR); 	if (evt->event_handler)		evt->event_handler(evt); 	return IRQ_HANDLED;} static struct timer_of rda_ostimer_of = {	.flags = TIMER_OF_IRQ | TIMER_OF_BASE, 	.clkevt = {		.name = "rda-ostimer",		.rating = 250,		.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |			    CLOCK_EVT_FEAT_DYNIRQ,		.set_state_shutdown = rda_ostimer_set_state_shutdown,		.set_state_oneshot = rda_ostimer_set_state_oneshot,		.set_state_periodic = rda_ostimer_set_state_periodic,		.tick_resume = rda_ostimer_tick_resume,		.set_next_event	= rda_ostimer_set_next_event,	}, 	.of_base = {		.name = "rda-timer",		.index = 0,	}, 	.of_irq = {		.name = "ostimer",		.handler = rda_ostimer_interrupt,		.flags = IRQF_TIMER,	},}; static u64 rda_hwtimer_read(struct clocksource *cs){	void __iomem *base = timer_of_base(&rda_ostimer_of);	u32 lo, hi; 	/* Always read low 32 bits first */	do {		lo = readl_relaxed(base + RDA_HWTIMER_LOCKVAL_L);		hi = readl_relaxed(base + RDA_HWTIMER_LOCKVAL_H);	} while (hi != readl_relaxed(base + RDA_HWTIMER_LOCKVAL_H)); 	return ((u64)hi << 32) | lo;} static struct clocksource rda_hwtimer_clocksource = {	.name           = "rda-timer",	.rating         = 400,	.read           = rda_hwtimer_read,	.mask           = CLOCKSOURCE_MASK(64),	.flags          = CLOCK_SOURCE_IS_CONTINUOUS,}; static int __init rda_timer_init(struct device_node *np){	unsigned long rate = 2000000;	int ret; 	ret = timer_of_init(np, &rda_ostimer_of);	if (ret)		return ret; 	clocksource_register_hz(&rda_hwtimer_clocksource, rate); 	clockevents_config_and_register(&rda_ostimer_of.clkevt, rate,					0x2, UINT_MAX); 	return 0;} TIMER_OF_DECLARE(rda8810pl, "rda,8810pl-timer", rda_timer_init);