linux-imx

/*

 * Spreadtrum watchdog driver

 * Copyright (C) 2017 Spreadtrum - http://www.spreadtrum.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.

 *

 * 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.

 */

​

#include <linux/bitops.h>

#include <linux/clk.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/watchdog.h>

​

#define SPRD_WDT_LOAD_LOW       0x0

#define SPRD_WDT_LOAD_HIGH      0x4

#define SPRD_WDT_CTRL           0x8

#define SPRD_WDT_INT_CLR        0xc

#define SPRD_WDT_INT_RAW        0x10

#define SPRD_WDT_INT_MSK        0x14

#define SPRD_WDT_CNT_LOW        0x18

#define SPRD_WDT_CNT_HIGH       0x1c

#define SPRD_WDT_LOCK           0x20

#define SPRD_WDT_IRQ_LOAD_LOW       0x2c

#define SPRD_WDT_IRQ_LOAD_HIGH      0x30

​

/* WDT_CTRL */

#define SPRD_WDT_INT_EN_BIT     BIT(0)

#define SPRD_WDT_CNT_EN_BIT     BIT(1)

#define SPRD_WDT_NEW_VER_EN     BIT(2)

#define SPRD_WDT_RST_EN_BIT     BIT(3)

​

/* WDT_INT_CLR */

#define SPRD_WDT_INT_CLEAR_BIT      BIT(0)

#define SPRD_WDT_RST_CLEAR_BIT      BIT(3)

​

/* WDT_INT_RAW */

#define SPRD_WDT_INT_RAW_BIT        BIT(0)

#define SPRD_WDT_RST_RAW_BIT        BIT(3)

#define SPRD_WDT_LD_BUSY_BIT        BIT(4)

​

/* 1s equal to 32768 counter steps */

#define SPRD_WDT_CNT_STEP       32768

​

#define SPRD_WDT_UNLOCK_KEY     0xe551

#define SPRD_WDT_MIN_TIMEOUT        3

#define SPRD_WDT_MAX_TIMEOUT        60

​

#define SPRD_WDT_CNT_HIGH_SHIFT     16

#define SPRD_WDT_LOW_VALUE_MASK     GENMASK(15, 0)