linux-imx

/*

 * Keystone broadcast clock-event

 *

 * Copyright 2013 Texas Instruments, Inc.

 *

 * Author: Ivan Khoronzhuk <ivan.khoronzhuk@ti.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.

 *

 */

​

#include <linux/clk.h>

#include <linux/clockchips.h>

#include <linux/clocksource.h>

#include <linux/interrupt.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

​

#define TIMER_NAME          "timer-keystone"

​

/* Timer register offsets */

#define TIM12               0x10

#define TIM34               0x14

#define PRD12               0x18

#define PRD34               0x1c

#define TCR             0x20

#define TGCR                0x24

#define INTCTLSTAT          0x44

​

/* Timer register bitfields */

#define TCR_ENAMODE_MASK        0xC0

#define TCR_ENAMODE_ONESHOT_MASK    0x40

#define TCR_ENAMODE_PERIODIC_MASK   0x80

​

#define TGCR_TIM_UNRESET_MASK       0x03

#define INTCTLSTAT_ENINT_MASK       0x01

​

/**

 * struct keystone_timer: holds timer's data

 * @base: timer memory base address

 * @hz_period: cycles per HZ period

 * @event_dev: event device based on timer

 */

static struct keystone_timer {

    void __iomem *base;

    unsigned long hz_period;

    struct clock_event_device event_dev;

} timer;

​

static inline u32 keystone_timer_readl(unsigned long rg)

{

    return readl_relaxed(timer.base + rg);

}

​

static inline void keystone_timer_writel(u32 val, unsigned long rg)

{

    writel_relaxed(val, timer.base + rg);

}

​

/**

 * keystone_timer_barrier: write memory barrier