aboutsummaryrefslogtreecommitdiff
path: root/post/drivers/rtc.c
blob: c603f0e6728c9b5922235a2b460b4bb9bfd95c5f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

#include <common.h>

/*
 * RTC test
 *
 * The Real Time Clock (RTC) operation is verified by this test.
 * The following features are verified:
 *   o) RTC Power Fault
 *	This is verified by analyzing the rtc_get() return status.
 *   o) Time uniformity
 *      This is verified by reading RTC in polling within
 *      a short period of time.
 *   o) Passing month boundaries
 *      This is checked by setting RTC to a second before
 *      a month boundary and reading it after its passing the
 *      boundary. The test is performed for both leap- and
 *      nonleap-years.
 */

#include <post.h>
#include <rtc.h>

#if CONFIG_POST & CONFIG_SYS_POST_RTC

static int rtc_post_skip (ulong * diff)
{
	struct rtc_time tm1;
	struct rtc_time tm2;
	ulong start1;
	ulong start2;

	rtc_get (&tm1);
	start1 = get_timer (0);

	while (1) {
		rtc_get (&tm2);
		start2 = get_timer (0);
		if (tm1.tm_sec != tm2.tm_sec)
			break;
		if (start2 - start1 > 1500)
			break;
	}

	if (tm1.tm_sec != tm2.tm_sec) {
		*diff = start2 - start1;

		return 0;
	} else {
		return -1;
	}
}

static void rtc_post_restore (struct rtc_time *tm, unsigned int sec)
{
	time_t t = rtc_mktime(tm) + sec;
	struct rtc_time ntm;

	rtc_to_tm(t, &ntm);

	rtc_set (&ntm);
}

int rtc_post_test (int flags)
{
	ulong diff;
	unsigned int i;
	struct rtc_time svtm;
	static unsigned int daysnl[] =
			{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
	static unsigned int daysl[] =
			{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
	unsigned int ynl = 1999;
	unsigned int yl = 2000;
	unsigned int skipped = 0;
	int reliable;

	/* Time reliability */
	reliable = rtc_get (&svtm);

	/* Time uniformity */
	if (rtc_post_skip (&diff) != 0) {
		post_log ("Timeout while waiting for a new second !\n");

		return -1;
	}

	for (i = 0; i < 5; i++) {
		if (rtc_post_skip (&diff) != 0) {
			post_log ("Timeout while waiting for a new second !\n");

			return -1;
		}

		if (diff < 950 || diff > 1050) {
			post_log ("Invalid second duration !\n");

			return -1;
		}
	}

	/* Passing month boundaries */

	if (rtc_post_skip (&diff) != 0) {
		post_log ("Timeout while waiting for a new second !\n");

		return -1;
	}
	rtc_get (&svtm);

	for (i = 0; i < 12; i++) {
		time_t t;
		struct rtc_time tm;

		tm.tm_year = ynl;
		tm.tm_mon = i + 1;
		tm.tm_mday = daysnl[i];
		tm.tm_hour = 23;
		tm.tm_min = 59;
		tm.tm_sec = 59;
		t = rtc_mktime(&tm);
		rtc_to_tm(t, &tm);
		rtc_set (&tm);

		skipped++;
		if (rtc_post_skip (&diff) != 0) {
			rtc_post_restore (&svtm, skipped);
			post_log ("Timeout while waiting for a new second !\n");

			return -1;
		}

		rtc_get (&tm);
		if (tm.tm_mon == i + 1) {
			rtc_post_restore (&svtm, skipped);
			post_log ("Month %d boundary is not passed !\n", i + 1);

			return -1;
		}
	}

	for (i = 0; i < 12; i++) {
		time_t t;
		struct rtc_time tm;

		tm.tm_year = yl;
		tm.tm_mon = i + 1;
		tm.tm_mday = daysl[i];
		tm.tm_hour = 23;
		tm.tm_min = 59;
		tm.tm_sec = 59;
		t = rtc_mktime(&tm);

		rtc_to_tm(t, &tm);
		rtc_set (&tm);

		skipped++;
		if (rtc_post_skip (&diff) != 0) {
			rtc_post_restore (&svtm, skipped);
			post_log ("Timeout while waiting for a new second !\n");

			return -1;
		}

		rtc_get (&tm);
		if (tm.tm_mon == i + 1) {
			rtc_post_restore (&svtm, skipped);
			post_log ("Month %d boundary is not passed !\n", i + 1);

			return -1;
		}
	}
	rtc_post_restore (&svtm, skipped);

	/* If come here, then RTC operates correcty, check the correctness
	 * of the time it reports.
	 */
	if (reliable < 0) {
		post_log ("RTC Time is not reliable! Power fault? \n");

		return -1;
	}

	return 0;
}

#endif /* CONFIG_POST & CONFIG_SYS_POST_RTC */