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      1 /*	$NetBSD: eprtc.c,v 1.9 2025/09/07 21:45:11 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2005 HAMAJIMA Katsuomi. All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: eprtc.c,v 1.9 2025/09/07 21:45:11 thorpej Exp $");
     30 
     31 #include <sys/param.h>
     32 #include <sys/systm.h>
     33 #include <sys/kernel.h>
     34 #include <sys/device.h>
     35 #include <dev/clock_subr.h>
     36 #include <sys/bus.h>
     37 #include <arm/ep93xx/ep93xxvar.h>
     38 #include <arm/ep93xx/epsocvar.h>
     39 #include <arm/ep93xx/eprtcreg.h>
     40 
     41 struct eprtc_softc {
     42 	device_t		sc_dev;
     43 	bus_space_tag_t		sc_iot;
     44 	bus_space_handle_t	sc_ioh;
     45 	struct todr_chip_handle	sc_todr;
     46 };
     47 
     48 static int eprtc_match(device_t, cfdata_t, void *);
     49 static void eprtc_attach(device_t, device_t, void *);
     50 
     51 CFATTACH_DECL_NEW(eprtc, sizeof(struct eprtc_softc),
     52 	      eprtc_match, eprtc_attach, NULL, NULL);
     53 
     54 static int eprtc_gettime(struct todr_chip_handle *, struct timeval *);
     55 static int eprtc_settime(struct todr_chip_handle *, struct timeval *);
     56 
     57 static int
     58 eprtc_match(device_t parent, cfdata_t match, void *aux)
     59 {
     60 	return 1;
     61 }
     62 
     63 static void
     64 eprtc_attach(device_t parent, device_t self, void *aux)
     65 {
     66 	struct eprtc_softc *sc = device_private(self);
     67 	struct epsoc_attach_args *sa = aux;
     68 
     69 	printf("\n");
     70 	sc->sc_dev = self;
     71 	sc->sc_iot = sa->sa_iot;
     72 
     73 	if (bus_space_map(sa->sa_iot, sa->sa_addr,
     74 			  sa->sa_size, 0, &sc->sc_ioh)) {
     75 		printf("%s: Cannot map registers", device_xname(self));
     76 		return;
     77 	}
     78 
     79 	sc->sc_todr.todr_dev = self;
     80 	sc->sc_todr.todr_gettime = eprtc_gettime;
     81 	sc->sc_todr.todr_settime = eprtc_settime;
     82 	todr_attach(&sc->sc_todr);
     83 }
     84 
     85 static int
     86 eprtc_gettime(struct todr_chip_handle *ch, struct timeval *tv)
     87 {
     88 	struct eprtc_softc *sc = device_private(ch->todr_dev);
     89 
     90 	tv->tv_sec = bus_space_read_4(sc->sc_iot, sc->sc_ioh, EP93XX_RTC_Data);
     91 	tv->tv_usec = 0;
     92 	return 0;
     93 }
     94 
     95 static int
     96 eprtc_settime(struct todr_chip_handle *ch, struct timeval *tv)
     97 {
     98 	struct eprtc_softc *sc = device_private(ch->todr_dev);
     99 
    100 	bus_space_write_4(sc->sc_iot, sc->sc_ioh, EP93XX_RTC_Load, tv->tv_sec);
    101 	return 0;
    102 }
    103