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pl031.c revision 1.1.8.2
      1  1.1.8.2  jdolecek /* $NetBSD: pl031.c,v 1.1.8.2 2017/12/03 11:37:03 jdolecek Exp $ */
      2  1.1.8.2  jdolecek 
      3  1.1.8.2  jdolecek /*-
      4  1.1.8.2  jdolecek  * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca>
      5  1.1.8.2  jdolecek  * All rights reserved.
      6  1.1.8.2  jdolecek  *
      7  1.1.8.2  jdolecek  * Redistribution and use in source and binary forms, with or without
      8  1.1.8.2  jdolecek  * modification, are permitted provided that the following conditions
      9  1.1.8.2  jdolecek  * are met:
     10  1.1.8.2  jdolecek  * 1. Redistributions of source code must retain the above copyright
     11  1.1.8.2  jdolecek  *    notice, this list of conditions and the following disclaimer.
     12  1.1.8.2  jdolecek  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1.8.2  jdolecek  *    notice, this list of conditions and the following disclaimer in the
     14  1.1.8.2  jdolecek  *    documentation and/or other materials provided with the distribution.
     15  1.1.8.2  jdolecek  *
     16  1.1.8.2  jdolecek  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  1.1.8.2  jdolecek  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  1.1.8.2  jdolecek  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  1.1.8.2  jdolecek  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  1.1.8.2  jdolecek  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  1.1.8.2  jdolecek  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  1.1.8.2  jdolecek  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  1.1.8.2  jdolecek  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  1.1.8.2  jdolecek  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  1.1.8.2  jdolecek  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  1.1.8.2  jdolecek  * SUCH DAMAGE.
     27  1.1.8.2  jdolecek  */
     28  1.1.8.2  jdolecek 
     29  1.1.8.2  jdolecek #include <sys/cdefs.h>
     30  1.1.8.2  jdolecek __KERNEL_RCSID(0, "$NetBSD: pl031.c,v 1.1.8.2 2017/12/03 11:37:03 jdolecek Exp $");
     31  1.1.8.2  jdolecek 
     32  1.1.8.2  jdolecek #include <sys/param.h>
     33  1.1.8.2  jdolecek #include <sys/systm.h>
     34  1.1.8.2  jdolecek #include <sys/device.h>
     35  1.1.8.2  jdolecek #include <sys/kmem.h>
     36  1.1.8.2  jdolecek #include <sys/bus.h>
     37  1.1.8.2  jdolecek 
     38  1.1.8.2  jdolecek #include <dev/clock_subr.h>
     39  1.1.8.2  jdolecek 
     40  1.1.8.2  jdolecek #include <dev/ic/pl031var.h>
     41  1.1.8.2  jdolecek 
     42  1.1.8.2  jdolecek #define	RTCDR	0x000
     43  1.1.8.2  jdolecek #define	RTCLR	0x008
     44  1.1.8.2  jdolecek #define	RTCCR	0x00c
     45  1.1.8.2  jdolecek #define	 RTCCR_START	__BIT(0)
     46  1.1.8.2  jdolecek 
     47  1.1.8.2  jdolecek #define	RTC_READ(sc, reg)			\
     48  1.1.8.2  jdolecek 	bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
     49  1.1.8.2  jdolecek #define	RTC_WRITE(sc, reg, val)		\
     50  1.1.8.2  jdolecek 	bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
     51  1.1.8.2  jdolecek 
     52  1.1.8.2  jdolecek static int
     53  1.1.8.2  jdolecek plrtc_gettime(todr_chip_handle_t tch, struct timeval *tv)
     54  1.1.8.2  jdolecek {
     55  1.1.8.2  jdolecek 	struct plrtc_softc * const sc = tch->cookie;
     56  1.1.8.2  jdolecek 
     57  1.1.8.2  jdolecek 	tv->tv_sec = RTC_READ(sc, RTCDR);
     58  1.1.8.2  jdolecek 	tv->tv_usec = 0;
     59  1.1.8.2  jdolecek 
     60  1.1.8.2  jdolecek 	return 0;
     61  1.1.8.2  jdolecek }
     62  1.1.8.2  jdolecek 
     63  1.1.8.2  jdolecek static int
     64  1.1.8.2  jdolecek plrtc_settime(todr_chip_handle_t tch, struct timeval *tv)
     65  1.1.8.2  jdolecek {
     66  1.1.8.2  jdolecek 	struct plrtc_softc * const sc = tch->cookie;
     67  1.1.8.2  jdolecek 
     68  1.1.8.2  jdolecek 	RTC_WRITE(sc, RTCLR, tv->tv_sec);
     69  1.1.8.2  jdolecek 
     70  1.1.8.2  jdolecek 	return 0;
     71  1.1.8.2  jdolecek }
     72  1.1.8.2  jdolecek 
     73  1.1.8.2  jdolecek void
     74  1.1.8.2  jdolecek plrtc_attach(struct plrtc_softc *sc)
     75  1.1.8.2  jdolecek {
     76  1.1.8.2  jdolecek 	aprint_naive("\n");
     77  1.1.8.2  jdolecek 	aprint_normal(": RTC\n");
     78  1.1.8.2  jdolecek 
     79  1.1.8.2  jdolecek 	sc->sc_todr.todr_gettime = plrtc_gettime;
     80  1.1.8.2  jdolecek 	sc->sc_todr.todr_settime = plrtc_settime;
     81  1.1.8.2  jdolecek 	sc->sc_todr.cookie = sc;
     82  1.1.8.2  jdolecek 
     83  1.1.8.2  jdolecek 	RTC_WRITE(sc, RTCCR, RTCCR_START);
     84  1.1.8.2  jdolecek }
     85