linux-imx

/* Copyright (c) 2014, The Linux Foundation. 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 and

 * only 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/clk.h>

#include <linux/delay.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/watchdog.h>

#include <linux/of_device.h>

​

enum wdt_reg {

    WDT_RST,

    WDT_EN,

    WDT_STS,

    WDT_BARK_TIME,

    WDT_BITE_TIME,

};

​

static const u32 reg_offset_data_apcs_tmr[] = {

    [WDT_RST] = 0x38,

    [WDT_EN] = 0x40,

    [WDT_STS] = 0x44,

    [WDT_BARK_TIME] = 0x4C,

    [WDT_BITE_TIME] = 0x5C,

};

​

static const u32 reg_offset_data_kpss[] = {

    [WDT_RST] = 0x4,

    [WDT_EN] = 0x8,

    [WDT_STS] = 0xC,

    [WDT_BARK_TIME] = 0x10,

    [WDT_BITE_TIME] = 0x14,

};

​

struct qcom_wdt {

    struct watchdog_device  wdd;

    struct clk      *clk;

    unsigned long       rate;

    void __iomem        *base;

    const u32       *layout;

};

​

static void __iomem *wdt_addr(struct qcom_wdt *wdt, enum wdt_reg reg)

{

    return wdt->base + wdt->layout[reg];

}

​

static inline

struct qcom_wdt *to_qcom_wdt(struct watchdog_device *wdd)

{

    return container_of(wdd, struct qcom_wdt, wdd);

}

​

static int qcom_wdt_start(struct watchdog_device *wdd)

{

    struct qcom_wdt *wdt = to_qcom_wdt(wdd);

​

    writel(0, wdt_addr(wdt, WDT_EN));

    writel(1, wdt_addr(wdt, WDT_RST));

    writel(wdd->timeout * wdt->rate, wdt_addr(wdt, WDT_BARK_TIME));

    writel(wdd->timeout * wdt->rate, wdt_addr(wdt, WDT_BITE_TIME));

    writel(1, wdt_addr(wdt, WDT_EN));

    return 0;

}

​

static int qcom_wdt_stop(struct watchdog_device *wdd)

{

    struct qcom_wdt *wdt = to_qcom_wdt(wdd);

​

    writel(0, wdt_addr(wdt, WDT_EN));

    return 0;

}

​

static int qcom_wdt_ping(struct watchdog_device *wdd)

{

    struct qcom_wdt *wdt = to_qcom_wdt(wdd);

​

    writel(1, wdt_addr(wdt, WDT_RST));

    return 0;

}