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do things the todr(9) way

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This commit is contained in:
joff 2004-12-27 02:46:22 +00:00
parent 3f09dcaa18
commit 60b9b5a6ef
1 changed files with 80 additions and 5 deletions
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85
sys/arch/arm/ep93xx/epclk.c
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@ -1,4 +1,4 @@
/* $NetBSD: epclk.c,v 1.1 2004/12/22 19:09:29 joff Exp $ */
/* $NetBSD: epclk.c,v 1.2 2004/12/27 02:46:22 joff Exp $ */
/*
* Copyright (c) 2004 Jesse Off
@ -47,7 +47,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: epclk.c,v 1.1 2004/12/22 19:09:29 joff Exp $");
__KERNEL_RCSID(0, "$NetBSD: epclk.c,v 1.2 2004/12/27 02:46:22 joff Exp $");
#include <sys/types.h>
#include <sys/param.h>
@ -64,6 +64,7 @@ __KERNEL_RCSID(0, "$NetBSD: epclk.c,v 1.1 2004/12/22 19:09:29 joff Exp $");
#include <arm/ep93xx/epsocvar.h>
#include <arm/ep93xx/epclkreg.h>
#include <arm/ep93xx/ep93xxvar.h>
#include <dev/clock_subr.h>
static int epclk_match(struct device *, struct cfdata *, void *);
static void epclk_attach(struct device *, struct device *, void *);
@ -296,15 +297,89 @@ delay(unsigned int len)
}
}
todr_chip_handle_t todr_handle;
/*
* todr_attach:
*
* Set the specified time-of-day register as the system real-time clock.
*/
void
resettodr(void)
todr_attach(todr_chip_handle_t todr)
{
if (todr_handle)
panic("todr_attach: rtc already configured");
todr_handle = todr;
}
/*
* inittodr:
*
* Initialize time from the time-of-day register.
*/
#define MINYEAR 2003 /* minimum plausible year */
void
inittodr(time_t base)
{
time_t deltat;
int badbase;
time.tv_sec = base;
time.tv_usec = 0;
if (base < (MINYEAR - 1970) * SECYR) {
printf("WARNING: preposterous time in file system");
/* read the system clock anyway */
base = (MINYEAR - 1970) * SECYR;
badbase = 1;
} else
badbase = 0;
if (todr_handle == NULL ||
todr_gettime(todr_handle, (struct timeval *)&time) != 0 ||
time.tv_sec == 0) {
/*
* Believe the time in the file system for lack of
* anything better, resetting the TODR.
*/
time.tv_sec = base;
time.tv_usec = 0;
if (todr_handle != NULL && !badbase) {
printf("WARNING: preposterous clock chip time\n");
resettodr();
}
goto bad;
}
if (!badbase) {
/*
* See if we tained/lost two or more days; if
* so, assume something is amiss.
*/
deltat = time.tv_sec - base;
if (deltat < 0)
deltat = -deltat;
if (deltat < 2 * SECDAY)
return; /* all is well */
printf("WARNING: clock %s %ld days\n",
time.tv_sec < base ? "lost" : "gained",
(long)deltat / SECDAY);
}
bad:
printf("WARNING: CHECK AND RESET THE DATE!\n");
}
/*
* resettodr:
*
* Reset the time-of-day register with the current time.
*/
void
resettodr(void)
{
if (time.tv_sec == 0)
return;
if (todr_handle != NULL &&
todr_settime(todr_handle, (struct timeval *)&time) != 0)
printf("resettodr: failed to set time\n");
}