linux-imx

/*

 * DS1286 Real Time Clock interface for Linux

 *

 * Copyright (C) 1998, 1999, 2000 Ralf Baechle

 * Copyright (C) 2008 Thomas Bogendoerfer

 *

 * Based on code written by Paul Gortmaker.

 *

 * 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.

 */

​

#include <linux/module.h>

#include <linux/rtc.h>

#include <linux/platform_device.h>

#include <linux/bcd.h>

#include <linux/rtc/ds1286.h>

#include <linux/io.h>

#include <linux/slab.h>

​

struct ds1286_priv {

    struct rtc_device *rtc;

    u32 __iomem *rtcregs;

    spinlock_t lock;

};

​

static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg)

{

    return __raw_readl(&priv->rtcregs[reg]) & 0xff;

}

​

static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg)

{

    __raw_writel(data, &priv->rtcregs[reg]);

}

​

​

static int ds1286_alarm_irq_enable(struct device *dev, unsigned int enabled)

{

    struct ds1286_priv *priv = dev_get_drvdata(dev);

    unsigned long flags;

    unsigned char val;

​

    /* Allow or mask alarm interrupts */

    spin_lock_irqsave(&priv->lock, flags);

    val = ds1286_rtc_read(priv, RTC_CMD);

    if (enabled)

        val &=  ~RTC_TDM;

    else

        val |=  RTC_TDM;

    ds1286_rtc_write(priv, val, RTC_CMD);

    spin_unlock_irqrestore(&priv->lock, flags);

​

    return 0;

}

​

#ifdef CONFIG_RTC_INTF_DEV

​

static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)

{

    struct ds1286_priv *priv = dev_get_drvdata(dev);