linux-imx

/*

 * drivers/clocksource/timer-oxnas-rps.c

 *

 * Copyright (C) 2009 Oxford Semiconductor Ltd

 * Copyright (C) 2013 Ma Haijun <mahaijuns@gmail.com>

 * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/init.h>

#include <linux/irq.h>

#include <linux/io.h>

#include <linux/clk.h>

#include <linux/slab.h>

#include <linux/interrupt.h>

#include <linux/of_irq.h>

#include <linux/of_address.h>

#include <linux/clockchips.h>

#include <linux/sched_clock.h>

​

/* TIMER1 used as tick

 * TIMER2 used as clocksource

 */

​

/* Registers definitions */

​

#define TIMER_LOAD_REG      0x0

#define TIMER_CURR_REG      0x4

#define TIMER_CTRL_REG      0x8

#define TIMER_CLRINT_REG    0xC

​

#define TIMER_BITS      24

​

#define TIMER_MAX_VAL       (BIT(TIMER_BITS) - 1)

​

#define TIMER_PERIODIC      BIT(6)

#define TIMER_ENABLE        BIT(7)

​

#define TIMER_DIV1      (0)

#define TIMER_DIV16     (1 << 2)

#define TIMER_DIV256        (2 << 2)

​

#define TIMER1_REG_OFFSET   0

#define TIMER2_REG_OFFSET   0x20

​

/* Clockevent & Clocksource data */

​

struct oxnas_rps_timer {

    struct clock_event_device clkevent;

    void __iomem *clksrc_base;