// SPDX-License-Identifier: GPL-2.0-or-later/* *  Cirrus Logic CLPS711X clocksource driver * *  Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru> */ #include <linux/clk.h>#include <linux/clockchips.h>#include <linux/clocksource.h>#include <linux/interrupt.h>#include <linux/io.h>#include <linux/of_address.h>#include <linux/of_irq.h>#include <linux/sched_clock.h>#include <linux/slab.h> enum {	CLPS711X_CLKSRC_CLOCKSOURCE,	CLPS711X_CLKSRC_CLOCKEVENT,}; static void __iomem *tcd; static u64 notrace clps711x_sched_clock_read(void){	return ~readw(tcd);} static void __init clps711x_clksrc_init(struct clk *clock, void __iomem *base){	unsigned long rate = clk_get_rate(clock); 	tcd = base; 	clocksource_mmio_init(tcd, "clps711x-clocksource", rate, 300, 16,			      clocksource_mmio_readw_down); 	sched_clock_register(clps711x_sched_clock_read, 16, rate);} static irqreturn_t clps711x_timer_interrupt(int irq, void *dev_id){	struct clock_event_device *evt = dev_id; 	evt->event_handler(evt); 	return IRQ_HANDLED;} static int __init _clps711x_clkevt_init(struct clk *clock, void __iomem *base,					unsigned int irq){	struct clock_event_device *clkevt;	unsigned long rate; 	clkevt = kzalloc_obj(*clkevt);	if (!clkevt)		return -ENOMEM; 	rate = clk_get_rate(clock); 	/* Set Timer prescaler */	writew(DIV_ROUND_CLOSEST(rate, HZ), base); 	clkevt->name = "clps711x-clockevent";	clkevt->rating = 300;	clkevt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_C3STOP;	clkevt->cpumask = cpumask_of(0);	clockevents_config_and_register(clkevt, HZ, 0, 0); 	return request_irq(irq, clps711x_timer_interrupt, IRQF_TIMER,			   "clps711x-timer", clkevt);} static int __init clps711x_timer_init(struct device_node *np){	unsigned int irq = irq_of_parse_and_map(np, 0);	struct clk *clock = of_clk_get(np, 0);	void __iomem *base = of_iomap(np, 0);	int ret = 0; 	if (!base)		return -ENOMEM;	if (!irq) {		ret = -EINVAL;		goto unmap_io;	}	if (IS_ERR(clock)) {		ret = PTR_ERR(clock);		goto unmap_io;	} 	switch (of_alias_get_id(np, "timer")) {	case CLPS711X_CLKSRC_CLOCKSOURCE:		clps711x_clksrc_init(clock, base);		return 0;	case CLPS711X_CLKSRC_CLOCKEVENT:		ret =  _clps711x_clkevt_init(clock, base, irq);		break;	default:		ret = -EINVAL;		break;	} unmap_io:	iounmap(base);	return ret;}TIMER_OF_DECLARE(clps711x, "cirrus,ep7209-timer", clps711x_timer_init);