// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (c) 2017, Linaro Ltd.  All rights reserved. * * Author: Daniel Lezcano <daniel.lezcano@linaro.org> */#include <linux/clk.h>#include <linux/interrupt.h>#include <linux/of.h>#include <linux/of_address.h>#include <linux/of_irq.h>#include <linux/slab.h> #include "timer-of.h" /** * timer_of_irq_exit - Release the interrupt * @of_irq: an of_timer_irq structure pointer * * Free the irq resource */static __init void timer_of_irq_exit(struct of_timer_irq *of_irq){	struct timer_of *to = container_of(of_irq, struct timer_of, of_irq); 	struct clock_event_device *clkevt = &to->clkevt; 	of_irq->percpu ? free_percpu_irq(of_irq->irq, clkevt) :		free_irq(of_irq->irq, clkevt);} /** * timer_of_irq_init - Request the interrupt * @np: a device tree node pointer * @of_irq: an of_timer_irq structure pointer * * Get the interrupt number from the DT from its definition and * request it. The interrupt is gotten by falling back the following way: * * - Get interrupt number by name * - Get interrupt number by index * * When the interrupt is per CPU, 'request_percpu_irq()' is called, * otherwise 'request_irq()' is used. * * Returns 0 on success, < 0 otherwise */static __init int timer_of_irq_init(struct device_node *np,				    struct of_timer_irq *of_irq){	int ret;	struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);	struct clock_event_device *clkevt = &to->clkevt; 	if (of_irq->name) {		of_irq->irq = ret = of_irq_get_byname(np, of_irq->name);		if (ret < 0) {			pr_err("Failed to get interrupt %s for %s\n",			       of_irq->name, np->full_name);			return ret;		}	} else	{		of_irq->irq = irq_of_parse_and_map(np, of_irq->index);	}	if (!of_irq->irq) {		pr_err("Failed to map interrupt for %pOF\n", np);		return -EINVAL;	} 	ret = of_irq->percpu ?		request_percpu_irq(of_irq->irq, of_irq->handler,				   np->full_name, clkevt) :		request_irq(of_irq->irq, of_irq->handler,			    of_irq->flags ? of_irq->flags : IRQF_TIMER,			    np->full_name, clkevt);	if (ret) {		pr_err("Failed to request irq %d for %pOF\n", of_irq->irq, np);		return ret;	} 	clkevt->irq = of_irq->irq; 	return 0;} /** * timer_of_clk_exit - Release the clock resources * @of_clk: a of_timer_clk structure pointer * * Disables and releases the refcount on the clk */static __init void timer_of_clk_exit(struct of_timer_clk *of_clk){	of_clk->rate = 0;	clk_disable_unprepare(of_clk->clk);	clk_put(of_clk->clk);} /** * timer_of_clk_init - Initialize the clock resources * @np: a device tree node pointer * @of_clk: a of_timer_clk structure pointer * * Get the clock by name or by index, enable it and get the rate * * Returns 0 on success, < 0 otherwise */static __init int timer_of_clk_init(struct device_node *np,				    struct of_timer_clk *of_clk){	int ret; 	of_clk->clk = of_clk->name ? of_clk_get_by_name(np, of_clk->name) :		of_clk_get(np, of_clk->index);	if (IS_ERR(of_clk->clk)) {		pr_err("Failed to get clock for %pOF\n", np);		return PTR_ERR(of_clk->clk);	} 	ret = clk_prepare_enable(of_clk->clk);	if (ret) {		pr_err("Failed for enable clock for %pOF\n", np);		goto out_clk_put;	} 	of_clk->rate = clk_get_rate(of_clk->clk);	if (!of_clk->rate) {		ret = -EINVAL;		pr_err("Failed to get clock rate for %pOF\n", np);		goto out_clk_disable;	} 	of_clk->period = DIV_ROUND_UP(of_clk->rate, HZ);out:	return ret; out_clk_disable:	clk_disable_unprepare(of_clk->clk);out_clk_put:	clk_put(of_clk->clk); 	goto out;} static __init void timer_of_base_exit(struct of_timer_base *of_base){	iounmap(of_base->base);} static __init int timer_of_base_init(struct device_node *np,				     struct of_timer_base *of_base){	of_base->base = of_base->name ?		of_io_request_and_map(np, of_base->index, of_base->name) :		of_iomap(np, of_base->index);	if (IS_ERR(of_base->base)) {		pr_err("Failed to iomap (%s)\n", of_base->name);		return PTR_ERR(of_base->base);	} 	return 0;} int __init timer_of_init(struct device_node *np, struct timer_of *to){	int ret = -EINVAL;	int flags = 0; 	if (to->flags & TIMER_OF_BASE) {		ret = timer_of_base_init(np, &to->of_base);		if (ret)			goto out_fail;		flags |= TIMER_OF_BASE;	} 	if (to->flags & TIMER_OF_CLOCK) {		ret = timer_of_clk_init(np, &to->of_clk);		if (ret)			goto out_fail;		flags |= TIMER_OF_CLOCK;	} 	if (to->flags & TIMER_OF_IRQ) {		ret = timer_of_irq_init(np, &to->of_irq);		if (ret)			goto out_fail;		flags |= TIMER_OF_IRQ;	} 	if (!to->clkevt.name)		to->clkevt.name = np->name; 	to->np = np; 	return ret; out_fail:	if (flags & TIMER_OF_IRQ)		timer_of_irq_exit(&to->of_irq); 	if (flags & TIMER_OF_CLOCK)		timer_of_clk_exit(&to->of_clk); 	if (flags & TIMER_OF_BASE)		timer_of_base_exit(&to->of_base);	return ret;} /** * timer_of_cleanup - release timer_of ressources * @to: timer_of structure * * Release the ressources that has been used in timer_of_init(). * This function should be called in init error cases */void __init timer_of_cleanup(struct timer_of *to){	if (to->flags & TIMER_OF_IRQ)		timer_of_irq_exit(&to->of_irq); 	if (to->flags & TIMER_OF_CLOCK)		timer_of_clk_exit(&to->of_clk); 	if (to->flags & TIMER_OF_BASE)		timer_of_base_exit(&to->of_base);}