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Add an initialization function of DS1287A RTC and call it during attach.

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It looks the boot firmware doesn't initialize the control registers
of DS1287A (while it resets NVRAM settings) and RTC oscillator is not
started properly after replacement.

Now my LUNA-II can keep RTC properly even after reboot.
This commit is contained in:
tsutsui 2013-07-19 16:42:30 +00:00
parent cb2ad9b126
commit b0074c5d2c
2 changed files with 28 additions and 3 deletions
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28
sys/arch/luna68k/dev/timekeeper.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: timekeeper.c,v 1.12 2013/01/26 15:44:14 tsutsui Exp $ */
/* $NetBSD: timekeeper.c,v 1.13 2013/07/19 16:42:30 tsutsui Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
@ -31,7 +31,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: timekeeper.c,v 1.12 2013/01/26 15:44:14 tsutsui Exp $");
__KERNEL_RCSID(0, "$NetBSD: timekeeper.c,v 1.13 2013/07/19 16:42:30 tsutsui Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -58,6 +58,7 @@ struct timekeeper_softc {
static int clock_match(device_t, cfdata_t, void *);
static void clock_attach(device_t, device_t, void *);
static void dsclock_init(struct timekeeper_softc *);
CFATTACH_DECL_NEW(clock, sizeof (struct timekeeper_softc),
clock_match, clock_attach, NULL, NULL);
@ -103,6 +104,7 @@ clock_attach(device_t parent, device_t self, void *aux)
sc->sc_todr.todr_gettime_ymdhms = dsclock_get;
sc->sc_todr.todr_settime_ymdhms = dsclock_set;
sc->sc_todr.cookie = sc;
dsclock_init(sc);
aprint_normal(": ds1287a\n");
break;
}
@ -161,6 +163,28 @@ mkclock_set(todr_chip_handle_t tch, struct clock_ymdhms *dt)
return 0;
}
static void
dsclock_init(struct timekeeper_softc *sc)
{
volatile uint8_t *chiptime = (void *)sc->sc_clock;
/*
* It looks the firmware ROM doesn't initialize DS1287 at all
* even after the chip is replaced, so explicitly initialize
* control registers here.
*/
chiptime = (void *)sc->sc_clock;
/* No DSE, 24HR, BINARY */
chiptime[MC_REGB] =
(chiptime[MC_REGB] & ~MC_REGB_DSE) |
(MC_REGB_24HR | MC_REGB_BINARY);
/* make sure to start integrated clock OSC */
chiptime[MC_REGA] =
(chiptime[MC_REGA] & ~MC_REGA_DVMASK) | MC_BASE_32_KHz;
}
/*
* Get the time of day, based on the clock's value and/or the base value.
*/

3
sys/arch/luna68k/dev/timekeeper.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: timekeeper.h,v 1.2 2008/04/28 20:23:26 martin Exp $ */
/* $NetBSD: timekeeper.h,v 1.3 2013/07/19 16:42:30 tsutsui Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
@ -62,6 +62,7 @@
#define MC_REGA_RSMASK 0x0f /* Interrupt rate select mask (see below) */
#define MC_REGA_DVMASK 0x70 /* Divisor select mask (see below) */
#define MC_REGA_UIP 0x80 /* Update in progress; read only. */
#define MC_BASE_32_KHz 0x20 /* 32 KHz crystal (enable OSC on DS1287) */
#define MC_REGB 0xb /* Control register B */
#define MC_REGB_DSE 0x01 /* Daylight Savings Enable */