229 lines
6.6 KiB
C
229 lines
6.6 KiB
C
/* $NetBSD: mkclock_isa.c,v 1.9 2005/12/11 12:18:20 christos Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2002 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Klaus J. Klein.
|
|
*
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Mostek MK48T18 time-of-day chip attachment to ISA bus, using two
|
|
* 8-bit ports for address selection and one 8-bit port for data.
|
|
*/
|
|
|
|
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
|
|
__KERNEL_RCSID(0, "$NetBSD: mkclock_isa.c,v 1.9 2005/12/11 12:18:20 christos Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/device.h>
|
|
|
|
#include <machine/bus.h>
|
|
|
|
#include <dev/clock_subr.h>
|
|
#include <dev/ic/mk48txxreg.h>
|
|
#include <dev/ic/mk48txxvar.h>
|
|
|
|
#include <dev/isa/isavar.h>
|
|
|
|
|
|
/* Offsets of registers into ISA I/O space */
|
|
#define MKCLOCK_STB0 0 /* Address low */
|
|
#define MKCLOCK_STB1 1 /* Address high */
|
|
#define MKCLOCK_DATA 3 /* Data port */
|
|
|
|
#define MKCLOCK_NPORTS (MKCLOCK_DATA - MKCLOCK_STB0 + 1)
|
|
|
|
|
|
/* Autoconfiguration interface */
|
|
int mkclock_isa_match(struct device *, struct cfdata *, void *);
|
|
void mkclock_isa_attach(struct device *, struct device *, void *);
|
|
|
|
CFATTACH_DECL(mkclock_isa, sizeof (struct mk48txx_softc),
|
|
mkclock_isa_match, mkclock_isa_attach, NULL, NULL);
|
|
|
|
|
|
/* mk48txx interface */
|
|
uint8_t mkclock_isa_nvrd(struct mk48txx_softc *, int);
|
|
void mkclock_isa_nvwr(struct mk48txx_softc *, int, uint8_t);
|
|
|
|
|
|
int
|
|
mkclock_isa_match(struct device *parent, struct cfdata *match, void *aux)
|
|
{
|
|
struct isa_attach_args *ia = aux;
|
|
struct mk48txx_softc mk48txx, *sc;
|
|
uint8_t csr, ocsr;
|
|
unsigned int t1, t2;
|
|
int found;
|
|
|
|
found = 0;
|
|
|
|
if (ia->ia_nio < 1 ||
|
|
(ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
|
|
ia->ia_io[0].ir_addr != 0x74))
|
|
return (0);
|
|
|
|
if (ia->ia_niomem > 0 &&
|
|
(ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM))
|
|
return (0);
|
|
|
|
if (ia->ia_nirq > 0 &&
|
|
(ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ))
|
|
return (0);
|
|
|
|
if (ia->ia_ndrq > 0 &&
|
|
(ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ))
|
|
return (0);
|
|
|
|
/*
|
|
* Map I/O space, then try to determine if it's really there.
|
|
*/
|
|
sc = &mk48txx;
|
|
sc->sc_bst = ia->ia_iot;
|
|
if (bus_space_map(sc->sc_bst, 0x74, MKCLOCK_NPORTS, 0, &sc->sc_bsh))
|
|
return (0);
|
|
|
|
/* Supposedly no control bits are set after POST; check for this. */
|
|
ocsr = mkclock_isa_nvrd(sc, MK48T18_CLKOFF + MK48TXX_ICSR);
|
|
if (ocsr != 0)
|
|
goto unmap;
|
|
|
|
/* Set clock data to read mode, prohibiting updates from clock. */
|
|
csr = ocsr | MK48TXX_CSR_READ;
|
|
mkclock_isa_nvwr(sc, MK48T18_CLKOFF + MK48TXX_ICSR, csr);
|
|
/* Compare. */
|
|
if (mkclock_isa_nvrd(sc, MK48T18_CLKOFF + MK48TXX_ICSR) != csr)
|
|
goto restore;
|
|
|
|
/* Read from the seconds counter. */
|
|
t1 = FROMBCD(mkclock_isa_nvrd(sc, MK48T18_CLKOFF + MK48TXX_ISEC));
|
|
if (t1 > 59)
|
|
goto restore;
|
|
|
|
/* Make it tick again, wait, then look again. */
|
|
mkclock_isa_nvwr(sc, MK48T18_CLKOFF + MK48TXX_ICSR, ocsr);
|
|
DELAY(1100000);
|
|
mkclock_isa_nvwr(sc, MK48T18_CLKOFF + MK48TXX_ICSR, csr);
|
|
t2 = FROMBCD(mkclock_isa_nvrd(sc, MK48T18_CLKOFF + MK48TXX_ISEC));
|
|
if (t2 > 59)
|
|
goto restore;
|
|
|
|
/* If [1,2) seconds have passed since, call it a clock. */
|
|
if ((t1 + 1) % 60 == t2 || (t1 + 2) % 60 == t2)
|
|
found = 1;
|
|
|
|
restore:
|
|
mkclock_isa_nvwr(sc, MK48T18_CLKOFF + MK48TXX_ICSR, ocsr);
|
|
unmap:
|
|
bus_space_unmap(sc->sc_bst, sc->sc_bsh, MKCLOCK_NPORTS);
|
|
|
|
if (found) {
|
|
ia->ia_nio = 1;
|
|
ia->ia_io[0].ir_addr = 0x74;
|
|
ia->ia_io[0].ir_size = MKCLOCK_NPORTS;
|
|
|
|
ia->ia_niomem = 0;
|
|
ia->ia_nirq = 0;
|
|
ia->ia_ndrq = 0;
|
|
}
|
|
|
|
return (found);
|
|
}
|
|
|
|
void
|
|
mkclock_isa_attach(struct device *parent, struct device *self, void *aux)
|
|
{
|
|
struct isa_attach_args *ia = aux;
|
|
struct mk48txx_softc *sc = (void *)self;
|
|
|
|
/* Map I/O space. */
|
|
sc->sc_bst = ia->ia_iot;
|
|
if (bus_space_map(sc->sc_bst, ia->ia_io[0].ir_addr,
|
|
ia->ia_io[0].ir_size, 0, &sc->sc_bsh))
|
|
panic("mkclock_isa_attach: couldn't map clock I/O space");
|
|
|
|
/* Attach to MI mk48txx driver. */
|
|
sc->sc_model = "mk48t18";
|
|
sc->sc_year0 = 1968;
|
|
sc->sc_nvrd = mkclock_isa_nvrd;
|
|
sc->sc_nvwr = mkclock_isa_nvwr;
|
|
|
|
mk48txx_attach(sc);
|
|
|
|
printf(" Timekeeper NVRAM/RTC\n");
|
|
|
|
todr_attach(&sc->sc_handle);
|
|
}
|
|
|
|
/*
|
|
* Bus access methods for MI mk48txx driver.
|
|
*/
|
|
uint8_t
|
|
mkclock_isa_nvrd(struct mk48txx_softc *sc, int off)
|
|
{
|
|
bus_space_tag_t iot;
|
|
bus_space_handle_t ioh;
|
|
uint8_t datum;
|
|
int s;
|
|
|
|
iot = sc->sc_bst;
|
|
ioh = sc->sc_bsh;
|
|
|
|
s = splclock();
|
|
bus_space_write_1(iot, ioh, MKCLOCK_STB0, off & 0xff);
|
|
bus_space_write_1(iot, ioh, MKCLOCK_STB1, off >> 8);
|
|
datum = bus_space_read_1(iot, ioh, MKCLOCK_DATA);
|
|
splx(s);
|
|
|
|
return (datum);
|
|
}
|
|
|
|
void
|
|
mkclock_isa_nvwr(struct mk48txx_softc *sc, int off, uint8_t datum)
|
|
{
|
|
bus_space_tag_t iot;
|
|
bus_space_handle_t ioh;
|
|
int s;
|
|
|
|
iot = sc->sc_bst;
|
|
ioh = sc->sc_bsh;
|
|
|
|
s = splclock();
|
|
bus_space_write_1(iot, ioh, MKCLOCK_STB0, off & 0xff);
|
|
bus_space_write_1(iot, ioh, MKCLOCK_STB1, off >> 8);
|
|
bus_space_write_1(iot, ioh, MKCLOCK_DATA, datum);
|
|
splx(s);
|
|
}
|