linux-imx

/*

 * Actions Semi Owl timer

 *

 * Copyright 2012 Actions Semi Inc.

 * Author: Actions Semi, Inc.

 *

 * Copyright (c) 2017 SUSE Linux GmbH

 * Author: Andreas Färber

 *

 * 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.

 */

​

#include <linux/clk.h>

#include <linux/clockchips.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/irqreturn.h>

#include <linux/sched_clock.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

​

#define OWL_Tx_CTL      0x0

#define OWL_Tx_CMP      0x4

#define OWL_Tx_VAL      0x8

​

#define OWL_Tx_CTL_PD       BIT(0)

#define OWL_Tx_CTL_INTEN    BIT(1)

#define OWL_Tx_CTL_EN       BIT(2)

​

static void __iomem *owl_timer_base;

static void __iomem *owl_clksrc_base;

static void __iomem *owl_clkevt_base;

​

static inline void owl_timer_reset(void __iomem *base)

{

    writel(0, base + OWL_Tx_CTL);

    writel(0, base + OWL_Tx_VAL);

    writel(0, base + OWL_Tx_CMP);

}

​

static inline void owl_timer_set_enabled(void __iomem *base, bool enabled)

{

    u32 ctl = readl(base + OWL_Tx_CTL);

​

    /* PD bit is cleared when set */

    ctl &= ~OWL_Tx_CTL_PD;

​

    if (enabled)

        ctl |= OWL_Tx_CTL_EN;

    else

        ctl &= ~OWL_Tx_CTL_EN;

​

    writel(ctl, base + OWL_Tx_CTL);

}

​

static u64 notrace owl_timer_sched_read(void)

{

    return (u64)readl(owl_clksrc_base + OWL_Tx_VAL);

}

​

static int owl_timer_set_state_shutdown(struct clock_event_device *evt)

{

    owl_timer_set_enabled(owl_clkevt_base, false);

​

    return 0;

}

​

static int owl_timer_set_state_oneshot(struct clock_event_device *evt)

{

    owl_timer_reset(owl_clkevt_base);

​

    return 0;

}

​

static int owl_timer_tick_resume(struct clock_event_device *evt)

{

    return 0;

}

​

static int owl_timer_set_next_event(unsigned long evt,

                    struct clock_event_device *ev)

{

    void __iomem *base = owl_clkevt_base;

​

    owl_timer_set_enabled(base, false);

    writel(OWL_Tx_CTL_INTEN, base + OWL_Tx_CTL);

    writel(0, base + OWL_Tx_VAL);

    writel(evt, base + OWL_Tx_CMP);