linux-imx

/*

 * Integrator/AP timer driver

 * Copyright (C) 2000-2003 Deep Blue Solutions Ltd

 * Copyright (c) 2014, Linaro Limited

 *

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

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

​

#include <linux/clk.h>

#include <linux/clocksource.h>

#include <linux/of_irq.h>

#include <linux/of_address.h>

#include <linux/of_platform.h>

#include <linux/clockchips.h>

#include <linux/interrupt.h>

#include <linux/sched_clock.h>

​

#include "timer-sp.h"

​

static void __iomem * sched_clk_base;

​

static u64 notrace integrator_read_sched_clock(void)

{

    return -readl(sched_clk_base + TIMER_VALUE);

}

​

static int __init integrator_clocksource_init(unsigned long inrate,

                          void __iomem *base)

{

    u32 ctrl = TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC;

    unsigned long rate = inrate;

    int ret;

​

    if (rate >= 1500000) {

        rate /= 16;

        ctrl |= TIMER_CTRL_DIV16;

    }

​

    writel(0xffff, base + TIMER_LOAD);

    writel(ctrl, base + TIMER_CTRL);

​

    ret = clocksource_mmio_init(base + TIMER_VALUE, "timer2",

                    rate, 200, 16, clocksource_mmio_readl_down);

    if (ret)

        return ret;

​

    sched_clk_base = base;

    sched_clock_register(integrator_read_sched_clock, 16, rate);

​

    return 0;

}

​

static unsigned long timer_reload;

static void __iomem * clkevt_base;

​

/*

 * IRQ handler for the timer

 */

static irqreturn_t integrator_timer_interrupt(int irq, void *dev_id)

{

    struct clock_event_device *evt = dev_id;

​

    /* clear the interrupt */

    writel(1, clkevt_base + TIMER_INTCLR);

​

    evt->event_handler(evt);

​

    return IRQ_HANDLED;

}

​

static int clkevt_shutdown(struct clock_event_device *evt)

{

    u32 ctrl = readl(clkevt_base + TIMER_CTRL) & ~TIMER_CTRL_ENABLE;

​

    /* Disable timer */

    writel(ctrl, clkevt_base + TIMER_CTRL);

    return 0;

}

​

static int clkevt_set_oneshot(struct clock_event_device *evt)