2019-05-28 10:10:04 -07:00
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// SPDX-License-Identifier: GPL-2.0-only
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2017-06-04 15:18:43 -07:00
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/*
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* Copyright (c) 2017, Linaro Ltd. All rights reserved.
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*
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* Author: Daniel Lezcano <daniel.lezcano@linaro.org>
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*/
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#include <linux/clk.h>
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#include <linux/interrupt.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/slab.h>
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#include "timer-of.h"
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2018-01-08 06:28:45 -07:00
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/**
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* timer_of_irq_exit - Release the interrupt
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* @of_irq: an of_timer_irq structure pointer
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*
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* Free the irq resource
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*/
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2018-01-08 06:28:44 -07:00
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static __init void timer_of_irq_exit(struct of_timer_irq *of_irq)
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2017-06-04 15:18:43 -07:00
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{
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struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);
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struct clock_event_device *clkevt = &to->clkevt;
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2024-08-19 03:03:35 -07:00
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free_irq(of_irq->irq, clkevt);
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2017-06-04 15:18:43 -07:00
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}
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2018-01-08 06:28:45 -07:00
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/**
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* timer_of_irq_init - Request the interrupt
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* @np: a device tree node pointer
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* @of_irq: an of_timer_irq structure pointer
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*
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* Get the interrupt number from the DT from its definition and
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* request it. The interrupt is gotten by falling back the following way:
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*
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* - Get interrupt number by name
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* - Get interrupt number by index
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*
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* Returns 0 on success, < 0 otherwise
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*/
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2018-01-08 06:28:44 -07:00
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static __init int timer_of_irq_init(struct device_node *np,
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struct of_timer_irq *of_irq)
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2017-06-04 15:18:43 -07:00
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{
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int ret;
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struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);
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struct clock_event_device *clkevt = &to->clkevt;
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2017-07-17 11:00:44 -07:00
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if (of_irq->name) {
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of_irq->irq = ret = of_irq_get_byname(np, of_irq->name);
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if (ret < 0) {
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2019-10-16 07:47:44 -07:00
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pr_err("Failed to get interrupt %s for %pOF\n",
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of_irq->name, np);
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2017-07-17 11:00:44 -07:00
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return ret;
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}
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} else {
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of_irq->irq = irq_of_parse_and_map(np, of_irq->index);
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}
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2017-06-04 15:18:43 -07:00
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if (!of_irq->irq) {
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2017-07-18 14:42:53 -07:00
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pr_err("Failed to map interrupt for %pOF\n", np);
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2017-06-04 15:18:43 -07:00
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return -EINVAL;
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}
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2024-08-19 03:03:35 -07:00
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ret = request_irq(of_irq->irq, of_irq->handler,
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of_irq->flags ? of_irq->flags : IRQF_TIMER,
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np->full_name, clkevt);
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2017-06-04 15:18:43 -07:00
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if (ret) {
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2017-07-18 14:42:53 -07:00
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pr_err("Failed to request irq %d for %pOF\n", of_irq->irq, np);
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2017-06-04 15:18:43 -07:00
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return ret;
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}
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clkevt->irq = of_irq->irq;
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return 0;
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}
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2018-01-08 06:28:45 -07:00
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/**
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* timer_of_clk_exit - Release the clock resources
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* @of_clk: a of_timer_clk structure pointer
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*
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* Disables and releases the refcount on the clk
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*/
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2018-01-08 06:28:44 -07:00
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static __init void timer_of_clk_exit(struct of_timer_clk *of_clk)
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2017-06-04 15:18:43 -07:00
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{
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of_clk->rate = 0;
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clk_disable_unprepare(of_clk->clk);
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clk_put(of_clk->clk);
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}
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2018-01-08 06:28:45 -07:00
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/**
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* timer_of_clk_init - Initialize the clock resources
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* @np: a device tree node pointer
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* @of_clk: a of_timer_clk structure pointer
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*
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* Get the clock by name or by index, enable it and get the rate
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*
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* Returns 0 on success, < 0 otherwise
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*/
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2018-01-08 06:28:44 -07:00
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static __init int timer_of_clk_init(struct device_node *np,
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struct of_timer_clk *of_clk)
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2017-06-04 15:18:43 -07:00
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{
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int ret;
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of_clk->clk = of_clk->name ? of_clk_get_by_name(np, of_clk->name) :
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of_clk_get(np, of_clk->index);
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if (IS_ERR(of_clk->clk)) {
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2019-08-21 08:02:40 -07:00
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ret = PTR_ERR(of_clk->clk);
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if (ret != -EPROBE_DEFER)
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pr_err("Failed to get clock for %pOF\n", np);
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goto out;
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2017-06-04 15:18:43 -07:00
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}
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ret = clk_prepare_enable(of_clk->clk);
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if (ret) {
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2017-07-18 14:42:53 -07:00
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pr_err("Failed for enable clock for %pOF\n", np);
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2017-06-04 15:18:43 -07:00
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goto out_clk_put;
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}
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of_clk->rate = clk_get_rate(of_clk->clk);
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if (!of_clk->rate) {
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ret = -EINVAL;
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2017-07-18 14:42:53 -07:00
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pr_err("Failed to get clock rate for %pOF\n", np);
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2017-06-04 15:18:43 -07:00
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goto out_clk_disable;
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}
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of_clk->period = DIV_ROUND_UP(of_clk->rate, HZ);
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out:
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return ret;
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out_clk_disable:
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clk_disable_unprepare(of_clk->clk);
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out_clk_put:
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clk_put(of_clk->clk);
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goto out;
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}
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2018-01-08 06:28:44 -07:00
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static __init void timer_of_base_exit(struct of_timer_base *of_base)
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2017-06-04 15:18:43 -07:00
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{
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iounmap(of_base->base);
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}
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2018-01-08 06:28:44 -07:00
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static __init int timer_of_base_init(struct device_node *np,
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struct of_timer_base *of_base)
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2017-06-04 15:18:43 -07:00
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{
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2018-01-08 06:28:49 -07:00
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of_base->base = of_base->name ?
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of_io_request_and_map(np, of_base->index, of_base->name) :
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of_iomap(np, of_base->index);
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2022-03-07 10:26:56 -07:00
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if (IS_ERR_OR_NULL(of_base->base)) {
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pr_err("Failed to iomap (%s:%s)\n", np->name, of_base->name);
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return of_base->base ? PTR_ERR(of_base->base) : -ENOMEM;
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2017-06-04 15:18:43 -07:00
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}
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return 0;
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}
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int __init timer_of_init(struct device_node *np, struct timer_of *to)
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{
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2017-06-21 14:49:54 -07:00
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int ret = -EINVAL;
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2017-06-04 15:18:43 -07:00
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int flags = 0;
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if (to->flags & TIMER_OF_BASE) {
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2018-01-08 06:28:44 -07:00
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ret = timer_of_base_init(np, &to->of_base);
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2017-06-04 15:18:43 -07:00
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if (ret)
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goto out_fail;
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flags |= TIMER_OF_BASE;
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}
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if (to->flags & TIMER_OF_CLOCK) {
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2018-01-08 06:28:44 -07:00
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ret = timer_of_clk_init(np, &to->of_clk);
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2017-06-04 15:18:43 -07:00
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if (ret)
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goto out_fail;
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flags |= TIMER_OF_CLOCK;
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}
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if (to->flags & TIMER_OF_IRQ) {
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2018-01-08 06:28:44 -07:00
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ret = timer_of_irq_init(np, &to->of_irq);
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2017-06-04 15:18:43 -07:00
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if (ret)
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goto out_fail;
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flags |= TIMER_OF_IRQ;
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}
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if (!to->clkevt.name)
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2019-10-16 07:47:45 -07:00
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to->clkevt.name = np->full_name;
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2018-01-08 06:28:48 -07:00
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to->np = np;
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2017-06-04 15:18:43 -07:00
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return ret;
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out_fail:
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if (flags & TIMER_OF_IRQ)
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2018-01-08 06:28:44 -07:00
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timer_of_irq_exit(&to->of_irq);
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2017-06-04 15:18:43 -07:00
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if (flags & TIMER_OF_CLOCK)
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2018-01-08 06:28:44 -07:00
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timer_of_clk_exit(&to->of_clk);
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2017-06-04 15:18:43 -07:00
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if (flags & TIMER_OF_BASE)
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2018-01-08 06:28:44 -07:00
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timer_of_base_exit(&to->of_base);
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2017-06-21 14:49:54 -07:00
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return ret;
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2017-06-04 15:18:43 -07:00
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}
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2017-10-23 02:58:37 -07:00
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2017-11-14 01:52:38 -07:00
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/**
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2021-03-22 14:39:03 -07:00
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* timer_of_cleanup - release timer_of resources
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2017-11-14 01:52:38 -07:00
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* @to: timer_of structure
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*
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2021-03-22 14:39:03 -07:00
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* Release the resources that has been used in timer_of_init().
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2017-11-14 01:52:38 -07:00
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* This function should be called in init error cases
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*/
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void __init timer_of_cleanup(struct timer_of *to)
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2017-10-23 02:58:37 -07:00
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{
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if (to->flags & TIMER_OF_IRQ)
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2018-01-08 06:28:44 -07:00
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timer_of_irq_exit(&to->of_irq);
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2017-10-23 02:58:37 -07:00
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if (to->flags & TIMER_OF_CLOCK)
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2018-01-08 06:28:44 -07:00
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timer_of_clk_exit(&to->of_clk);
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2017-10-23 02:58:37 -07:00
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if (to->flags & TIMER_OF_BASE)
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2018-01-08 06:28:44 -07:00
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timer_of_base_exit(&to->of_base);
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2017-10-23 02:58:37 -07:00
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}
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