linux-imx

/*

 *  linux/drivers/clocksource/arm_arch_timer.c

 *

 *  Copyright (C) 2011 ARM Ltd.

 *  All Rights Reserved

 *

 * 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.

 */

​

#define pr_fmt(fmt) "arm_arch_timer: " fmt

​

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/device.h>

#include <linux/smp.h>

#include <linux/cpu.h>

#include <linux/cpu_pm.h>

#include <linux/clockchips.h>

#include <linux/clocksource.h>

#include <linux/interrupt.h>

#include <linux/of_irq.h>

#include <linux/of_address.h>

#include <linux/io.h>

#include <linux/slab.h>

#include <linux/sched/clock.h>

#include <linux/sched_clock.h>

#include <linux/acpi.h>

​

#include <asm/arch_timer.h>

#include <asm/virt.h>

​

#include <clocksource/arm_arch_timer.h>

​

#undef pr_fmt

#define pr_fmt(fmt) "arch_timer: " fmt

​

#define CNTTIDR     0x08

#define CNTTIDR_VIRT(n) (BIT(1) << ((n) * 4))

​

#define CNTACR(n)   (0x40 + ((n) * 4))

#define CNTACR_RPCT BIT(0)

#define CNTACR_RVCT BIT(1)

#define CNTACR_RFRQ BIT(2)

#define CNTACR_RVOFF    BIT(3)

#define CNTACR_RWVT BIT(4)

#define CNTACR_RWPT BIT(5)

​

#define CNTVCT_LO   0x08

#define CNTVCT_HI   0x0c

#define CNTFRQ      0x10

#define CNTP_TVAL   0x28

#define CNTP_CTL    0x2c

#define CNTV_TVAL   0x38

#define CNTV_CTL    0x3c

​

static unsigned arch_timers_present __initdata;

​

static void __iomem *arch_counter_base;

​

struct arch_timer {

    void __iomem *base;