xref: /linux/include/linux/rtc/m48t59.h (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)
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 
48 struct 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