linux-imx

/*

 * An I2C driver for the Epson RX8581 RTC

 *

 * Author: Martyn Welch <martyn.welch@ge.com>

 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.

 *

 * 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.

 *

 * Based on: rtc-pcf8563.c (An I2C driver for the Philips PCF8563 RTC)

 * Copyright 2005-06 Tower Technologies

 */

​

#include <linux/module.h>

#include <linux/i2c.h>

#include <linux/bcd.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/regmap.h>

#include <linux/rtc.h>

#include <linux/log2.h>

​

#define RX8581_REG_SC       0x00 /* Second in BCD */

#define RX8581_REG_MN       0x01 /* Minute in BCD */

#define RX8581_REG_HR       0x02 /* Hour in BCD */

#define RX8581_REG_DW       0x03 /* Day of Week */

#define RX8581_REG_DM       0x04 /* Day of Month in BCD */

#define RX8581_REG_MO       0x05 /* Month in BCD */

#define RX8581_REG_YR       0x06 /* Year in BCD */

#define RX8581_REG_RAM      0x07 /* RAM */

#define RX8581_REG_AMN      0x08 /* Alarm Min in BCD*/

#define RX8581_REG_AHR      0x09 /* Alarm Hour in BCD */

#define RX8581_REG_ADM      0x0A

#define RX8581_REG_ADW      0x0A

#define RX8581_REG_TMR0     0x0B

#define RX8581_REG_TMR1     0x0C

#define RX8581_REG_EXT      0x0D /* Extension Register */

#define RX8581_REG_FLAG     0x0E /* Flag Register */

#define RX8581_REG_CTRL     0x0F /* Control Register */

​

​

/* Flag Register bit definitions */

#define RX8581_FLAG_UF      0x20 /* Update */

#define RX8581_FLAG_TF      0x10 /* Timer */

#define RX8581_FLAG_AF      0x08 /* Alarm */

#define RX8581_FLAG_VLF     0x02 /* Voltage Low */

​

/* Control Register bit definitions */

#define RX8581_CTRL_UIE     0x20 /* Update Interrupt Enable */

#define RX8581_CTRL_TIE     0x10 /* Timer Interrupt Enable */

#define RX8581_CTRL_AIE     0x08 /* Alarm Interrupt Enable */

#define RX8581_CTRL_STOP    0x02 /* STOP bit */

#define RX8581_CTRL_RESET   0x01 /* RESET bit */

​

#define RX8571_USER_RAM     0x10

#define RX8571_NVRAM_SIZE   0x10

​

struct rx8581 {

    struct regmap       *regmap;

    struct rtc_device   *rtc;

};

​