linux-imx

/*

 * Copyright (C) 2016-17 Synopsys, Inc. (www.synopsys.com)

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

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

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

​

/* ARC700 has two 32bit independent prog Timers: TIMER0 and TIMER1, Each can be

 * programmed to go from @count to @limit and optionally interrupt.

 * We've designated TIMER0 for clockevents and TIMER1 for clocksource

 *

 * ARCv2 based HS38 cores have RTC (in-core) and GFRC (inside ARConnect/MCIP)

 * which are suitable for UP and SMP based clocksources respectively

 */

​

#include <linux/interrupt.h>

#include <linux/clk.h>

#include <linux/clk-provider.h>

#include <linux/clocksource.h>

#include <linux/clockchips.h>

#include <linux/cpu.h>

#include <linux/of.h>

#include <linux/of_irq.h>

#include <linux/sched_clock.h>

​

#include <soc/arc/timers.h>

#include <soc/arc/mcip.h>

​

​

static unsigned long arc_timer_freq;

​

static int noinline arc_get_timer_clk(struct device_node *node)

{

    struct clk *clk;

    int ret;

​

    clk = of_clk_get(node, 0);

    if (IS_ERR(clk)) {

        pr_err("timer missing clk\n");

        return PTR_ERR(clk);

    }

​

    ret = clk_prepare_enable(clk);

    if (ret) {

        pr_err("Couldn't enable parent clk\n");

        return ret;

    }

​

    arc_timer_freq = clk_get_rate(clk);

​

    return 0;

}

​

/********** Clock Source Device *********/

​

#ifdef CONFIG_ARC_TIMERS_64BIT

​

static u64 arc_read_gfrc(struct clocksource *cs)

{

    unsigned long flags;

    u32 l, h;