linux-imx

/*

 * Mediatek SoCs General-Purpose Timer handling.

 *

 * Copyright (C) 2014 Matthias Brugger

 *

 * Matthias Brugger <matthias.bgg@gmail.com>

 *

 * 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.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/clockchips.h>

#include <linux/clocksource.h>

#include <linux/interrupt.h>

#include <linux/irqreturn.h>

#include <linux/sched_clock.h>

#include <linux/slab.h>

#include "timer-of.h"

​

#define TIMER_CLK_EVT           (1)

#define TIMER_CLK_SRC           (2)

​

#define TIMER_SYNC_TICKS        (3)

​

/* gpt */

#define GPT_IRQ_EN_REG          0x00

#define GPT_IRQ_ENABLE(val)     BIT((val) - 1)

#define GPT_IRQ_ACK_REG         0x08

#define GPT_IRQ_ACK(val)        BIT((val) - 1)

​

#define GPT_CTRL_REG(val)       (0x10 * (val))

#define GPT_CTRL_OP(val)        (((val) & 0x3) << 4)

#define GPT_CTRL_OP_ONESHOT     (0)

#define GPT_CTRL_OP_REPEAT      (1)

#define GPT_CTRL_OP_FREERUN     (3)

#define GPT_CTRL_CLEAR          (2)

#define GPT_CTRL_ENABLE         (1)

#define GPT_CTRL_DISABLE        (0)

​

#define GPT_CLK_REG(val)        (0x04 + (0x10 * (val)))

#define GPT_CLK_SRC(val)        (((val) & 0x1) << 4)

#define GPT_CLK_SRC_SYS13M      (0)

#define GPT_CLK_SRC_RTC32K      (1)

#define GPT_CLK_DIV1            (0x0)

#define GPT_CLK_DIV2            (0x1)

​

#define GPT_CNT_REG(val)        (0x08 + (0x10 * (val)))

#define GPT_CMP_REG(val)        (0x0C + (0x10 * (val)))

​

/* system timer */

#define SYST_BASE               (0x40)

​

#define SYST_CON                (SYST_BASE + 0x0)

#define SYST_VAL                (SYST_BASE + 0x4)