linux-imx

/*

 * An rtc driver for the Dallas DS1553

 *

 * 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.

 */

​

#include <linux/bcd.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/gfp.h>

#include <linux/delay.h>

#include <linux/jiffies.h>

#include <linux/interrupt.h>

#include <linux/rtc.h>

#include <linux/platform_device.h>

#include <linux/io.h>

#include <linux/module.h>

​

#define RTC_REG_SIZE        0x2000

#define RTC_OFFSET      0x1ff0

​

#define RTC_FLAGS       (RTC_OFFSET + 0)

#define RTC_SECONDS_ALARM   (RTC_OFFSET + 2)

#define RTC_MINUTES_ALARM   (RTC_OFFSET + 3)

#define RTC_HOURS_ALARM     (RTC_OFFSET + 4)

#define RTC_DATE_ALARM      (RTC_OFFSET + 5)

#define RTC_INTERRUPTS      (RTC_OFFSET + 6)

#define RTC_WATCHDOG        (RTC_OFFSET + 7)

#define RTC_CONTROL     (RTC_OFFSET + 8)

#define RTC_CENTURY     (RTC_OFFSET + 8)

#define RTC_SECONDS     (RTC_OFFSET + 9)

#define RTC_MINUTES     (RTC_OFFSET + 10)

#define RTC_HOURS       (RTC_OFFSET + 11)

#define RTC_DAY         (RTC_OFFSET + 12)

#define RTC_DATE        (RTC_OFFSET + 13)

#define RTC_MONTH       (RTC_OFFSET + 14)

#define RTC_YEAR        (RTC_OFFSET + 15)

​

#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 Flags register */

#define RTC_FLAGS_AF        0x40

#define RTC_FLAGS_BLF       0x10

​

/* Bits in the Interrupts register */

#define RTC_INTS_AE     0x80

​

struct rtc_plat_data {

    struct rtc_device *rtc;

    void __iomem *ioaddr;

    unsigned long last_jiffies;

    int irq;

    unsigned int irqen;

    int alrm_sec;

    int alrm_min;

    int alrm_hour;

    int alrm_mday;

    spinlock_t lock;

};

​

static int ds1553_rtc_set_time(struct device *dev, struct rtc_time *tm)

{

    struct rtc_plat_data *pdata = dev_get_drvdata(dev);

    void __iomem *ioaddr = pdata->ioaddr;

    u8 century;

​

    century = bin2bcd((tm->tm_year + 1900) / 100);

​

    writeb(RTC_WRITE, pdata->ioaddr + RTC_CONTROL);

​

    writeb(bin2bcd(tm->tm_year % 100), ioaddr + RTC_YEAR);

    writeb(bin2bcd(tm->tm_mon + 1), ioaddr + RTC_MONTH);

    writeb(bin2bcd(tm->tm_wday) & RTC_DAY_MASK, ioaddr + RTC_DAY);

    writeb(bin2bcd(tm->tm_mday), ioaddr + RTC_DATE);

    writeb(bin2bcd(tm->tm_hour), ioaddr + RTC_HOURS);

    writeb(bin2bcd(tm->tm_min), ioaddr + RTC_MINUTES);

    writeb(bin2bcd(tm->tm_sec) & RTC_SECONDS_MASK, ioaddr + RTC_SECONDS);

​

    /* RTC_CENTURY and RTC_CONTROL share same register */