linux-imx

/*

 * ST M48T86 / Dallas DS12887 RTC driver

 * 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.

 *

 * This drivers only supports the clock running in BCD and 24H mode.

 * If it will be ever adapted to binary and 12H mode, care must be taken

 * to not introduce bugs.

 */

​

#include <linux/module.h>

#include <linux/rtc.h>

#include <linux/platform_device.h>

#include <linux/bcd.h>

#include <linux/io.h>

​

#define M48T86_SEC      0x00

#define M48T86_SECALRM      0x01

#define M48T86_MIN      0x02

#define M48T86_MINALRM      0x03

#define M48T86_HOUR     0x04

#define M48T86_HOURALRM     0x05

#define M48T86_DOW      0x06 /* 1 = sunday */

#define M48T86_DOM      0x07

#define M48T86_MONTH        0x08 /* 1 - 12 */

#define M48T86_YEAR     0x09 /* 0 - 99 */

#define M48T86_A        0x0a

#define M48T86_B        0x0b

#define M48T86_B_SET        BIT(7)

#define M48T86_B_DM     BIT(2)

#define M48T86_B_H24        BIT(1)

#define M48T86_C        0x0c

#define M48T86_D        0x0d

#define M48T86_D_VRT        BIT(7)

#define M48T86_NVRAM(x)     (0x0e + (x))

#define M48T86_NVRAM_LEN    114

​

struct m48t86_rtc_info {

    void __iomem *index_reg;

    void __iomem *data_reg;

    struct rtc_device *rtc;

};

​

static unsigned char m48t86_readb(struct device *dev, unsigned long addr)

{

    struct m48t86_rtc_info *info = dev_get_drvdata(dev);

    unsigned char value;

​

    writeb(addr, info->index_reg);

    value = readb(info->data_reg);

​

    return value;

}

​

static void m48t86_writeb(struct device *dev,

              unsigned char value, unsigned long addr)

{

    struct m48t86_rtc_info *info = dev_get_drvdata(dev);