diff options
Diffstat (limited to 'roms/u-boot/post/drivers/rtc.c')
| -rw-r--r-- | roms/u-boot/post/drivers/rtc.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/roms/u-boot/post/drivers/rtc.c b/roms/u-boot/post/drivers/rtc.c new file mode 100644 index 000000000..c603f0e67 --- /dev/null +++ b/roms/u-boot/post/drivers/rtc.c @@ -0,0 +1,192 @@ +// 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 */ |