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
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