linux-imx

/*

 * Pistachio clocksource based on general-purpose timers

 *

 * Copyright (C) 2015 Imagination Technologies

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License. See the file "COPYING" in the main directory of this archive

 * for more details.

 */

​

#define pr_fmt(fmt) "%s: " fmt, __func__

​

#include <linux/clk.h>

#include <linux/clocksource.h>

#include <linux/clockchips.h>

#include <linux/delay.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/spinlock.h>

#include <linux/mfd/syscon.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/sched_clock.h>

#include <linux/time.h>

​

/* Top level reg */

#define CR_TIMER_CTRL_CFG       0x00

#define TIMER_ME_GLOBAL         BIT(0)

#define CR_TIMER_REV            0x10

​

/* Timer specific registers */

#define TIMER_CFG           0x20

#define TIMER_ME_LOCAL          BIT(0)

#define TIMER_RELOAD_VALUE      0x24

#define TIMER_CURRENT_VALUE     0x28

#define TIMER_CURRENT_OVERFLOW_VALUE    0x2C

#define TIMER_IRQ_STATUS        0x30

#define TIMER_IRQ_CLEAR         0x34

#define TIMER_IRQ_MASK          0x38

​

#define PERIP_TIMER_CONTROL     0x90

​

/* Timer specific configuration Values */

#define RELOAD_VALUE            0xffffffff

​

struct pistachio_clocksource {

    void __iomem *base;

    raw_spinlock_t lock;

    struct clocksource cs;

};

​

static struct pistachio_clocksource pcs_gpt;

​

#define to_pistachio_clocksource(cs)    \

    container_of(cs, struct pistachio_clocksource, cs)

​

static inline u32 gpt_readl(void __iomem *base, u32 offset, u32 gpt_id)

{

    return readl(base + 0x20 * gpt_id + offset);

}

​