1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * include/linux/rtc/m48t59.h
4 *
5 * Definitions for the platform data of m48t59 RTC chip driver.
6 *
7 * Copyright (c) 2007 Wind River Systems, Inc.
8 *
9 * Mark Zhan <rongkai.zhan@windriver.com>
10 */
11
12#ifndef _LINUX_RTC_M48T59_H_
13#define _LINUX_RTC_M48T59_H_
14
15/*
16 * M48T59 Register Offset
17 */
18#define M48T59_YEAR 0xf
19#define M48T59_MONTH 0xe
20#define M48T59_MDAY 0xd /* Day of Month */
21#define M48T59_WDAY 0xc /* Day of Week */
22#define M48T59_WDAY_CB 0x20 /* Century Bit */
23#define M48T59_WDAY_CEB 0x10 /* Century Enable Bit */
24#define M48T59_HOUR 0xb
25#define M48T59_MIN 0xa
26#define M48T59_SEC 0x9
27#define M48T59_CNTL 0x8
28#define M48T59_CNTL_READ 0x40
29#define M48T59_CNTL_WRITE 0x80
30#define M48T59_WATCHDOG 0x7
31#define M48T59_INTR 0x6
32#define M48T59_INTR_AFE 0x80 /* Alarm Interrupt Enable */
33#define M48T59_INTR_ABE 0x20
34#define M48T59_ALARM_DATE 0x5
35#define M48T59_ALARM_HOUR 0x4
36#define M48T59_ALARM_MIN 0x3
37#define M48T59_ALARM_SEC 0x2
38#define M48T59_UNUSED 0x1
39#define M48T59_FLAGS 0x0
40#define M48T59_FLAGS_WDT 0x80 /* watchdog timer expired */
41#define M48T59_FLAGS_AF 0x40 /* alarm */
42#define M48T59_FLAGS_BF 0x10 /* low battery */
43
44#define M48T59RTC_TYPE_M48T59 0 /* to keep compatibility */
45#define M48T59RTC_TYPE_M48T02 1
46#define M48T59RTC_TYPE_M48T08 2
47
48struct m48t59_plat_data {
49 /* The method to access M48T59 registers */
50 void (*write_byte)(struct device *dev, u32 ofs, u8 val);
51 unsigned char (*read_byte)(struct device *dev, u32 ofs);
52
53 int type; /* RTC model */
54
55 /* ioaddr mapped externally */
56 void __iomem *ioaddr;
57 /* offset to RTC registers, automatically set according to the type */
58 unsigned int offset;
59};
60
61#endif /* _LINUX_RTC_M48T59_H_ */
62

source code of linux/include/linux/rtc/m48t59.h