linux-imx

/*

 * A driver for the RTC embedded in the Cirrus Logic EP93XX processors

 * Copyright (c) 2006 Tower Technologies

 *

 * Author: Alessandro Zummo <a.zummo@towertech.it>

 *

 * 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/rtc.h>

#include <linux/platform_device.h>

#include <linux/io.h>

#include <linux/gfp.h>

​

#define EP93XX_RTC_DATA         0x000

#define EP93XX_RTC_MATCH        0x004

#define EP93XX_RTC_STATUS       0x008

#define  EP93XX_RTC_STATUS_INTR      (1<<0)

#define EP93XX_RTC_LOAD         0x00C

#define EP93XX_RTC_CONTROL      0x010

#define  EP93XX_RTC_CONTROL_MIE      (1<<0)

#define EP93XX_RTC_SWCOMP       0x108

#define  EP93XX_RTC_SWCOMP_DEL_MASK  0x001f0000

#define  EP93XX_RTC_SWCOMP_DEL_SHIFT     16

#define  EP93XX_RTC_SWCOMP_INT_MASK  0x0000ffff

#define  EP93XX_RTC_SWCOMP_INT_SHIFT     0

​

/*

 * struct device dev.platform_data is used to store our private data

 * because struct rtc_device does not have a variable to hold it.

 */

struct ep93xx_rtc {

    void __iomem    *mmio_base;

    struct rtc_device *rtc;

};

​

static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,

                unsigned short *delete)

{

    struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);

    unsigned long comp;

​

    comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);

​

    if (preload)

        *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)

                >> EP93XX_RTC_SWCOMP_INT_SHIFT;

​

    if (delete)

        *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)

                >> EP93XX_RTC_SWCOMP_DEL_SHIFT;

​

    return 0;

}

​

static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)

{

    struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);

    unsigned long time;

​