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