Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/arch/sh/boards/sh03/rtc.c -- CTP/PCI-SH03 on-chip RTC support | |
4 | * | |
5 | * Copyright (C) 2004 Saito.K & Jeanne(ksaito@interface.co.jp) | |
6 | * | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/time.h> | |
4f3a36a7 | 13 | #include <linux/bcd.h> |
1da177e4 | 14 | #include <linux/spinlock.h> |
09e81263 AB |
15 | #include <linux/io.h> |
16 | #include <linux/rtc.h> | |
17 | #include <linux/platform_device.h> | |
1da177e4 LT |
18 | |
19 | #define RTC_BASE 0xb0000000 | |
20 | #define RTC_SEC1 (RTC_BASE + 0) | |
21 | #define RTC_SEC10 (RTC_BASE + 1) | |
22 | #define RTC_MIN1 (RTC_BASE + 2) | |
23 | #define RTC_MIN10 (RTC_BASE + 3) | |
24 | #define RTC_HOU1 (RTC_BASE + 4) | |
25 | #define RTC_HOU10 (RTC_BASE + 5) | |
26 | #define RTC_WEE1 (RTC_BASE + 6) | |
27 | #define RTC_DAY1 (RTC_BASE + 7) | |
28 | #define RTC_DAY10 (RTC_BASE + 8) | |
29 | #define RTC_MON1 (RTC_BASE + 9) | |
30 | #define RTC_MON10 (RTC_BASE + 10) | |
31 | #define RTC_YEA1 (RTC_BASE + 11) | |
32 | #define RTC_YEA10 (RTC_BASE + 12) | |
33 | #define RTC_YEA100 (RTC_BASE + 13) | |
34 | #define RTC_YEA1000 (RTC_BASE + 14) | |
35 | #define RTC_CTL (RTC_BASE + 15) | |
36 | #define RTC_BUSY 1 | |
37 | #define RTC_STOP 2 | |
38 | ||
cd1408f2 | 39 | static DEFINE_SPINLOCK(sh03_rtc_lock); |
1da177e4 | 40 | |
09e81263 | 41 | static int sh03_rtc_gettimeofday(struct device *dev, struct rtc_time *tm) |
1da177e4 LT |
42 | { |
43 | unsigned int year, mon, day, hour, min, sec; | |
1da177e4 | 44 | |
cd1408f2 | 45 | spin_lock(&sh03_rtc_lock); |
1da177e4 | 46 | again: |
1da177e4 | 47 | do { |
9d56dd3b PM |
48 | sec = (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10; |
49 | min = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10; | |
50 | hour = (__raw_readb(RTC_HOU1) & 0xf) + (__raw_readb(RTC_HOU10) & 0xf) * 10; | |
51 | day = (__raw_readb(RTC_DAY1) & 0xf) + (__raw_readb(RTC_DAY10) & 0xf) * 10; | |
52 | mon = (__raw_readb(RTC_MON1) & 0xf) + (__raw_readb(RTC_MON10) & 0xf) * 10; | |
53 | year = (__raw_readb(RTC_YEA1) & 0xf) + (__raw_readb(RTC_YEA10) & 0xf) * 10 | |
54 | + (__raw_readb(RTC_YEA100 ) & 0xf) * 100 | |
55 | + (__raw_readb(RTC_YEA1000) & 0xf) * 1000; | |
56 | } while (sec != (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10); | |
1da177e4 LT |
57 | if (year == 0 || mon < 1 || mon > 12 || day > 31 || day < 1 || |
58 | hour > 23 || min > 59 || sec > 59) { | |
59 | printk(KERN_ERR | |
60 | "SH-03 RTC: invalid value, resetting to 1 Jan 2000\n"); | |
61 | printk("year=%d, mon=%d, day=%d, hour=%d, min=%d, sec=%d\n", | |
62 | year, mon, day, hour, min, sec); | |
63 | ||
9d56dd3b PM |
64 | __raw_writeb(0, RTC_SEC1); __raw_writeb(0, RTC_SEC10); |
65 | __raw_writeb(0, RTC_MIN1); __raw_writeb(0, RTC_MIN10); | |
66 | __raw_writeb(0, RTC_HOU1); __raw_writeb(0, RTC_HOU10); | |
67 | __raw_writeb(6, RTC_WEE1); | |
68 | __raw_writeb(1, RTC_DAY1); __raw_writeb(0, RTC_DAY10); | |
69 | __raw_writeb(1, RTC_MON1); __raw_writeb(0, RTC_MON10); | |
70 | __raw_writeb(0, RTC_YEA1); __raw_writeb(0, RTC_YEA10); | |
71 | __raw_writeb(0, RTC_YEA100); | |
72 | __raw_writeb(2, RTC_YEA1000); | |
73 | __raw_writeb(0, RTC_CTL); | |
1da177e4 LT |
74 | goto again; |
75 | } | |
76 | ||
cd1408f2 | 77 | spin_unlock(&sh03_rtc_lock); |
1da177e4 | 78 | |
09e81263 AB |
79 | tm->tm_sec = sec; |
80 | tm->tm_min = min; | |
81 | tm->tm_hour = hour; | |
82 | tm->tm_mday = day; | |
83 | tm->tm_mon = mon; | |
84 | tm->tm_year = year - 1900; | |
1da177e4 | 85 | |
09e81263 | 86 | return 0; |
1da177e4 LT |
87 | } |
88 | ||
09e81263 | 89 | static int set_rtc_mmss(struct rtc_time *tm) |
1da177e4 LT |
90 | { |
91 | int retval = 0; | |
92 | int real_seconds, real_minutes, cmos_minutes; | |
93 | int i; | |
94 | ||
95 | /* gets recalled with irq locally disabled */ | |
cd1408f2 | 96 | spin_lock(&sh03_rtc_lock); |
1da177e4 | 97 | for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */ |
9d56dd3b | 98 | if (!(__raw_readb(RTC_CTL) & RTC_BUSY)) |
1da177e4 | 99 | break; |
9d56dd3b | 100 | cmos_minutes = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10; |
09e81263 AB |
101 | real_seconds = tm->tm_sec; |
102 | real_minutes = tm->tm_min; | |
1da177e4 LT |
103 | if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1) |
104 | real_minutes += 30; /* correct for half hour time zone */ | |
105 | real_minutes %= 60; | |
106 | ||
107 | if (abs(real_minutes - cmos_minutes) < 30) { | |
9d56dd3b PM |
108 | __raw_writeb(real_seconds % 10, RTC_SEC1); |
109 | __raw_writeb(real_seconds / 10, RTC_SEC10); | |
110 | __raw_writeb(real_minutes % 10, RTC_MIN1); | |
111 | __raw_writeb(real_minutes / 10, RTC_MIN10); | |
1da177e4 | 112 | } else { |
3e5c1240 | 113 | printk_once(KERN_NOTICE |
1da177e4 LT |
114 | "set_rtc_mmss: can't update from %d to %d\n", |
115 | cmos_minutes, real_minutes); | |
09e81263 | 116 | retval = -EINVAL; |
1da177e4 | 117 | } |
cd1408f2 | 118 | spin_unlock(&sh03_rtc_lock); |
1da177e4 LT |
119 | |
120 | return retval; | |
121 | } | |
122 | ||
758e1523 | 123 | static int sh03_rtc_settimeofday(struct device *dev, struct rtc_time *tm) |
1da177e4 | 124 | { |
09e81263 | 125 | return set_rtc_mmss(tm); |
1da177e4 LT |
126 | } |
127 | ||
09e81263 AB |
128 | static const struct rtc_class_ops rtc_generic_ops = { |
129 | .read_time = sh03_rtc_gettimeofday, | |
130 | .set_time = sh03_rtc_settimeofday, | |
131 | }; | |
132 | ||
133 | static int __init sh03_time_init(void) | |
1da177e4 | 134 | { |
09e81263 AB |
135 | struct platform_device *pdev; |
136 | ||
137 | pdev = platform_device_register_data(NULL, "rtc-generic", -1, | |
138 | &rtc_generic_ops, | |
139 | sizeof(rtc_generic_ops)); | |
140 | ||
141 | return PTR_ERR_OR_ZERO(pdev); | |
1da177e4 | 142 | } |
09e81263 | 143 | arch_initcall(sh03_time_init); |