xref: /openbmc/linux/include/linux/rtc/m48t59.h (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)
1 *d2912cb1SThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-only */
2 2e774c7cSMark Zhan /*
3 2e774c7cSMark Zhan  * include/linux/rtc/m48t59.h
4 2e774c7cSMark Zhan  *
5 2e774c7cSMark Zhan  * Definitions for the platform data of m48t59 RTC chip driver.
6 2e774c7cSMark Zhan  *
7 2e774c7cSMark Zhan  * Copyright (c) 2007 Wind River Systems, Inc.
8 2e774c7cSMark Zhan  *
9 2e774c7cSMark Zhan  * Mark Zhan <rongkai.zhan@windriver.com>
10 2e774c7cSMark Zhan  */
11 2e774c7cSMark Zhan 
12 2e774c7cSMark Zhan #ifndef _LINUX_RTC_M48T59_H_
13 2e774c7cSMark Zhan #define _LINUX_RTC_M48T59_H_
14 2e774c7cSMark Zhan 
15 2e774c7cSMark Zhan /*
16 2e774c7cSMark Zhan  * M48T59 Register Offset
17 2e774c7cSMark Zhan  */
18 94fe7424SKrzysztof Helt #define M48T59_YEAR		0xf
19 94fe7424SKrzysztof Helt #define M48T59_MONTH		0xe
20 94fe7424SKrzysztof Helt #define M48T59_MDAY		0xd	/* Day of Month */
21 94fe7424SKrzysztof Helt #define M48T59_WDAY		0xc	/* Day of Week */
22 2e774c7cSMark Zhan #define M48T59_WDAY_CB			0x20	/* Century Bit */
23 2e774c7cSMark Zhan #define M48T59_WDAY_CEB			0x10	/* Century Enable Bit */
24 94fe7424SKrzysztof Helt #define M48T59_HOUR		0xb
25 94fe7424SKrzysztof Helt #define M48T59_MIN		0xa
26 94fe7424SKrzysztof Helt #define M48T59_SEC		0x9
27 94fe7424SKrzysztof Helt #define M48T59_CNTL		0x8
28 2e774c7cSMark Zhan #define M48T59_CNTL_READ		0x40
29 2e774c7cSMark Zhan #define M48T59_CNTL_WRITE		0x80
30 94fe7424SKrzysztof Helt #define M48T59_WATCHDOG		0x7
31 94fe7424SKrzysztof Helt #define M48T59_INTR		0x6
32 2e774c7cSMark Zhan #define M48T59_INTR_AFE			0x80	/* Alarm Interrupt Enable */
33 2e774c7cSMark Zhan #define M48T59_INTR_ABE			0x20
34 94fe7424SKrzysztof Helt #define M48T59_ALARM_DATE	0x5
35 94fe7424SKrzysztof Helt #define M48T59_ALARM_HOUR	0x4
36 94fe7424SKrzysztof Helt #define M48T59_ALARM_MIN	0x3
37 94fe7424SKrzysztof Helt #define M48T59_ALARM_SEC	0x2
38 94fe7424SKrzysztof Helt #define M48T59_UNUSED		0x1
39 94fe7424SKrzysztof Helt #define M48T59_FLAGS		0x0
40 2e774c7cSMark Zhan #define M48T59_FLAGS_WDT		0x80	/* watchdog timer expired */
41 2e774c7cSMark Zhan #define M48T59_FLAGS_AF			0x40	/* alarm */
42 2e774c7cSMark Zhan #define M48T59_FLAGS_BF			0x10	/* low battery */
43 2e774c7cSMark Zhan 
44 94fe7424SKrzysztof Helt #define M48T59RTC_TYPE_M48T59	0 /* to keep compatibility */
45 94fe7424SKrzysztof Helt #define M48T59RTC_TYPE_M48T02	1
46 94fe7424SKrzysztof Helt #define M48T59RTC_TYPE_M48T08	2
47 2e774c7cSMark Zhan 
48 2e774c7cSMark Zhan struct m48t59_plat_data {
49 94fe7424SKrzysztof Helt 	/* The method to access M48T59 registers */
50 2e774c7cSMark Zhan 	void (*write_byte)(struct device *dev, u32 ofs, u8 val);
51 2e774c7cSMark Zhan 	unsigned char (*read_byte)(struct device *dev, u32 ofs);
52 94fe7424SKrzysztof Helt 
53 94fe7424SKrzysztof Helt 	int type; /* RTC model */
54 94fe7424SKrzysztof Helt 
55 64151ad5SKrzysztof Helt 	/* ioaddr mapped externally */
56 64151ad5SKrzysztof Helt 	void __iomem *ioaddr;
57 94fe7424SKrzysztof Helt 	/* offset to RTC registers, automatically set according to the type */
58 94fe7424SKrzysztof Helt 	unsigned int offset;
59 2e774c7cSMark Zhan };
60 2e774c7cSMark Zhan 
61 2e774c7cSMark Zhan #endif /* _LINUX_RTC_M48T59_H_ */
62