linux/drivers/clocksource/timer-of.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2017, Linaro Ltd.  All rights reserved.
 *
 * Author: Daniel Lezcano <[email protected]>
 */
#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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

static __init void timer_of_base_exit(struct of_timer_base *of_base)
{ … }

static __init int timer_of_base_init(struct device_node *np,
				     struct of_timer_base *of_base)
{ … }

int __init timer_of_init(struct device_node *np, struct timer_of *to)
{ … }

/**
 * timer_of_cleanup - release timer_of resources
 * @to: timer_of structure
 *
 * Release the resources 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)
{ … }