linux-imx

/*

 * RTC driver code specific to PKUnity SoC and UniCore ISA

 *

 *  Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>

 *  Copyright (C) 2001-2010 Guan Xuetao

 *

 * 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.

 */

​

#include <linux/module.h>

#include <linux/fs.h>

#include <linux/string.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/interrupt.h>

#include <linux/rtc.h>

#include <linux/bcd.h>

#include <linux/clk.h>

#include <linux/log2.h>

#include <linux/slab.h>

#include <linux/uaccess.h>

#include <linux/io.h>

​

#include <asm/irq.h>

#include <mach/hardware.h>

​

static struct resource *puv3_rtc_mem;

​

static int puv3_rtc_alarmno = IRQ_RTCAlarm;

static int puv3_rtc_tickno  = IRQ_RTC;

​

static DEFINE_SPINLOCK(puv3_rtc_pie_lock);

​

/* IRQ Handlers */

static irqreturn_t puv3_rtc_alarmirq(int irq, void *id)

{

    struct rtc_device *rdev = id;

​

    writel(readl(RTC_RTSR) | RTC_RTSR_AL, RTC_RTSR);

    rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);

    return IRQ_HANDLED;

}

​

static irqreturn_t puv3_rtc_tickirq(int irq, void *id)

{

    struct rtc_device *rdev = id;

​

    writel(readl(RTC_RTSR) | RTC_RTSR_HZ, RTC_RTSR);

    rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);

    return IRQ_HANDLED;

}

​

/* Update control registers */

static void puv3_rtc_setaie(struct device *dev, int to)

{

    unsigned int tmp;

​

    dev_dbg(dev, "%s: aie=%d\n", __func__, to);

​

    tmp = readl(RTC_RTSR) & ~RTC_RTSR_ALE;

​

    if (to)

        tmp |= RTC_RTSR_ALE;

​

    writel(tmp, RTC_RTSR);

}

​

static int puv3_rtc_setpie(struct device *dev, int enabled)

{

    unsigned int tmp;

​

    dev_dbg(dev, "%s: pie=%d\n", __func__, enabled);

​

    spin_lock_irq(&puv3_rtc_pie_lock);

    tmp = readl(RTC_RTSR) & ~RTC_RTSR_HZE;

​

    if (enabled)

        tmp |= RTC_RTSR_HZE;

​

    writel(tmp, RTC_RTSR);

    spin_unlock_irq(&puv3_rtc_pie_lock);

​

    return 0;

}

​

/* Time read/write */

static int puv3_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)

{

    rtc_time_to_tm(readl(RTC_RCNR), rtc_tm);

​