1 /* $NetBSD: pl031.c,v 1.1 2017/06/08 21:00:43 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: pl031.c,v 1.1 2017/06/08 21:00:43 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/device.h> 35 #include <sys/kmem.h> 36 #include <sys/bus.h> 37 38 #include <dev/clock_subr.h> 39 40 #include <dev/ic/pl031var.h> 41 42 #define RTCDR 0x000 43 #define RTCLR 0x008 44 #define RTCCR 0x00c 45 #define RTCCR_START __BIT(0) 46 47 #define RTC_READ(sc, reg) \ 48 bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg)) 49 #define RTC_WRITE(sc, reg, val) \ 50 bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val)) 51 52 static int 53 plrtc_gettime(todr_chip_handle_t tch, struct timeval *tv) 54 { 55 struct plrtc_softc * const sc = tch->cookie; 56 57 tv->tv_sec = RTC_READ(sc, RTCDR); 58 tv->tv_usec = 0; 59 60 return 0; 61 } 62 63 static int 64 plrtc_settime(todr_chip_handle_t tch, struct timeval *tv) 65 { 66 struct plrtc_softc * const sc = tch->cookie; 67 68 RTC_WRITE(sc, RTCLR, tv->tv_sec); 69 70 return 0; 71 } 72 73 void 74 plrtc_attach(struct plrtc_softc *sc) 75 { 76 aprint_naive("\n"); 77 aprint_normal(": RTC\n"); 78 79 sc->sc_todr.todr_gettime = plrtc_gettime; 80 sc->sc_todr.todr_settime = plrtc_settime; 81 sc->sc_todr.cookie = sc; 82 83 RTC_WRITE(sc, RTCCR, RTCCR_START); 84 } 85