/* $NetBSD: mcclock_pnpbus.c,v 1.11 2023/12/20 15:29:06 thorpej Exp $ */
/*-
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Tim Rightnour
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* PNPBus driver for the mc146818 compatible time-of-day clock found on all
* IBM Prep machines. This one is only discernable from the motorola clock
* part by the interface portion of the residual data. (or by the small vendor
* item chip id)
* NOTE: The IBM machines actually have either a dallas 1385 or a dallas 1585
* chip. This driver should probably be replaced by something that does that
* one day.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mcclock_pnpbus.c,v 1.11 2023/12/20 15:29:06 thorpej Exp $");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/bus.h>
#include <machine/intr.h>
#include <machine/isa_machdep.h>
#include <machine/residual.h>
#include <machine/chpidpnp.h>
/* XXX */
#include <machine/pio.h>
#include <dev/clock_subr.h>
#include <dev/ic/mc146818reg.h>
#include <dev/ic/mc146818var.h>
#include <dev/ic/ds1687reg.h>
#include <dev/isa/isavar.h>
#include <prep/pnpbus/pnpbusvar.h>
static int mcclock_pnpbus_probe(device_t, cfdata_t, void *);
static void mcclock_pnpbus_attach(device_t, device_t, void *);
extern struct cfdriver mcclock_cd;
CFATTACH_DECL_NEW(mcclock_pnpbus, sizeof(struct mc146818_softc),
mcclock_pnpbus_probe, mcclock_pnpbus_attach, NULL, NULL);
void mcclock_pnpbus_write(struct mc146818_softc *, u_int, u_int);
u_int mcclock_pnpbus_read(struct mc146818_softc *, u_int);
void ds1585_reboot(void);
int have_ds1585 = 0;
#define MCCLOCK_STD_DEV 0
static int
mcclock_pnpbus_probe(device_t parent, cfdata_t cf, void *aux)
{
struct pnpbus_dev_attach_args *pna = aux;
int ret = 0;
if (strcmp(pna->pna_devid, "PNP0B00") == 0 &&
pna->subtype == RealTimeClock && pna->chipid == DallasRTC)
ret = 1;
if (strcmp(pna->pna_devid, "PNP0B00") == 0 &&
pna->subtype == RealTimeClock && pna->chipid == Dallas1585)
ret = 1;
if (ret)
pnpbus_scan(pna, pna->pna_ppc_dev);
return ret;
}
static void
mcclock_pnpbus_attach(device_t parent, device_t self, void *aux)
{
struct mc146818_softc *sc = device_private(self);
struct pnpbus_dev_attach_args *pna = aux;
sc->sc_dev = self;
sc->sc_bst = pna->pna_iot;
if (pnpbus_io_map(&pna->pna_res, 0, &sc->sc_bst, &sc->sc_bsh)) {
/* XXX should we panic instead? */
aprint_error(": couldn't map clock I/O space\n");
return;
}
if (pna->chipid == Dallas1585)
have_ds1585 = 1;
sc->sc_year0 = 1900;
sc->sc_mcread = mcclock_pnpbus_read;
sc->sc_mcwrite = mcclock_pnpbus_write;
sc->sc_flag = MC146818_BCD;
mc146818_attach(sc);
aprint_normal("\n");
(*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR);
}
void
ds1585_reboot(void)
{
struct mc146818_softc *sc;
int i, j;
if (!have_ds1585)
return;
sc = device_lookup_private(&mcclock_cd, MCCLOCK_STD_DEV);
/* monitors b0: 05,03,01 b1: 49, WIE=1 */
(*sc->sc_mcwrite)(sc, DS1687_ASEC, 0);
/* If we are nearing 59 minutes on the hour, the math is too complex
* to compute out when to reboot, so we just wait for the clock to
* flip back over to zero, then set the alarm time.
*/
i = (*sc->sc_mcread)(sc, DS1687_MIN);
if (i == 0x58) {
(*sc->sc_mcwrite)(sc, DS1687_AMIN, 0x59);
(*sc->sc_mcwrite)(sc, DS1687_ASEC, 0x59);
i = 0x59;
} else {
while (i == 0x59) {
delay(100);
i = (*sc->sc_mcread)(sc, DS1687_MIN);
}
i += 2;
if ((i & 0x0f) > 8)
i = (i & 0xf0) + 0x10;
(*sc->sc_mcwrite)(sc, DS1687_AMIN, i);
}
i = (*sc->sc_mcread)(sc, DS1687_HOUR);
(*sc->sc_mcwrite)(sc, DS1687_AHOUR, i);
j = (*sc->sc_mcread)(sc, DS1687_DOM); /* get date */
i = (*sc->sc_mcread)(sc, DS1687_CONTROLA);
i |= DS1687_BANK1; /* set DV0 on */
(*sc->sc_mcwrite)(sc, DS1687_CONTROLA, i);
/* write today into wakeup */
(*sc->sc_mcwrite)(sc, DS1687_BANK1_ADATE, j);
i = (*sc->sc_mcread)(sc, 0x4b); /* bank1 reg B */
i |= 0x82; /* WIE + ABE */
(*sc->sc_mcwrite)(sc, 0x4b, i);
i = (*sc->sc_mcread)(sc, 0x4b);
/* XXX power control bit on 7024/7025 */
outb(PREP_BUS_SPACE_IO + 0x856, 1);
for (;;);
}
void
mcclock_pnpbus_write(struct mc146818_softc *sc, u_int reg, u_int datum)
{
bus_space_tag_t iot;
bus_space_handle_t ioh;
iot = sc->sc_bst;
ioh = sc->sc_bsh;
bus_space_write_1(iot, ioh, 0, reg);
bus_space_write_1(iot, ioh, 1, datum);
}
u_int
mcclock_pnpbus_read(struct mc146818_softc *sc, u_int reg)
{
bus_space_tag_t iot;
bus_space_handle_t ioh;
u_int datum;
iot = sc->sc_bst;
ioh = sc->sc_bsh;
bus_space_write_1(iot, ioh, 0, reg);
datum = bus_space_read_1(iot, ioh, 1);
return (datum);
}
