linux-imx

/*

 * An rtc driver for the Dallas DS1742

 *

 * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>

 *

 * 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.

 *

 * Copyright (C) 2006 Torsten Ertbjerg Rasmussen <tr@newtec.dk>

 *  - nvram size determined from resource

 *  - this ds1742 driver now supports ds1743.

 */

​

#include <linux/bcd.h>

#include <linux/kernel.h>

#include <linux/gfp.h>

#include <linux/delay.h>

#include <linux/jiffies.h>

#include <linux/rtc.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/io.h>

#include <linux/module.h>

​

#define RTC_SIZE        8

​

#define RTC_CONTROL     0

#define RTC_CENTURY     0

#define RTC_SECONDS     1

#define RTC_MINUTES     2

#define RTC_HOURS       3

#define RTC_DAY         4

#define RTC_DATE        5

#define RTC_MONTH       6

#define RTC_YEAR        7

​

#define RTC_CENTURY_MASK    0x3f

#define RTC_SECONDS_MASK    0x7f

#define RTC_DAY_MASK        0x07

​

/* Bits in the Control/Century register */

#define RTC_WRITE       0x80

#define RTC_READ        0x40

​

/* Bits in the Seconds register */

#define RTC_STOP        0x80

​

/* Bits in the Day register */

#define RTC_BATT_FLAG       0x80

​

struct rtc_plat_data {

    void __iomem *ioaddr_nvram;

    void __iomem *ioaddr_rtc;

    unsigned long last_jiffies;

};

​

static int ds1742_rtc_set_time(struct device *dev, struct rtc_time *tm)

{

    struct rtc_plat_data *pdata = dev_get_drvdata(dev);

    void __iomem *ioaddr = pdata->ioaddr_rtc;

    u8 century;