1 /* $NetBSD: pl030_rtc.c,v 1.5 2002/10/02 05:10:33 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2001 ARM Ltd 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 * 3. The name of the company may not be used to endorse or promote 16 * products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* Include header files */ 33 34 #include <sys/types.h> 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/time.h> 39 #include <sys/device.h> 40 41 #include <arm/cpufunc.h> 42 #include <machine/intr.h> 43 #include <evbarm/ifpga/ifpgavar.h> 44 #include <evbarm/ifpga/ifpgamem.h> 45 #include <evbarm/ifpga/ifpgareg.h> 46 47 #define PL030_RTC_SIZE 0x14 48 49 struct plrtc_softc { 50 struct device sc_dev; 51 bus_space_tag_t sc_iot; 52 bus_space_handle_t sc_ioh; 53 }; 54 55 static int plrtc_probe (struct device *, struct cfdata *, void *); 56 static void plrtc_attach (struct device *, struct device *, void *); 57 58 CFATTACH_DECL(plrtc, sizeof(struct plrtc_softc), 59 plrtc_probe, plrtc_attach, NULL, NULL); 60 61 /* Remember our handle, since it isn't passed in by inittodr and 62 resettodr. */ 63 static struct plrtc_softc *plrtc_sc; 64 65 static int timeset = 0; 66 67 static int 68 plrtc_probe(struct device *parent, struct cfdata *cf, void *aux) 69 { 70 return 1; 71 } 72 73 static void 74 plrtc_attach(struct device *parent, struct device *self, void *aux) 75 { 76 struct ifpga_attach_args *ifa = aux; 77 struct plrtc_softc *sc = (struct plrtc_softc *)self; 78 79 sc->sc_iot = ifa->ifa_iot; 80 if (bus_space_map(ifa->ifa_iot, ifa->ifa_addr, PL030_RTC_SIZE, 0, 81 &sc->sc_ioh)) { 82 printf("%s: unable to map device\n", sc->sc_dev.dv_xname); 83 return; 84 } 85 86 plrtc_sc = sc; 87 88 printf("\n"); 89 } 90 91 void 92 inittodr(time_t base) 93 { 94 time_t rtc_time; 95 struct plrtc_softc *sc = plrtc_sc; 96 97 if (sc == NULL) 98 panic("RTC not attached"); 99 100 /* Default to the suggested time, but replace that with one from the 101 RTC if it seems more sensible. */ 102 rtc_time = bus_space_read_4(sc->sc_iot, sc->sc_ioh, IFPGA_RTC_DR); 103 104 time.tv_usec = 0; 105 time.tv_sec = rtc_time; 106 107 timeset = 1; 108 109 if (base > rtc_time) { 110 printf("inittodr: rtc value suspect, ignoring it.\n"); 111 time.tv_usec = 0; 112 time.tv_sec = base; 113 return; 114 } 115 } 116 117 void 118 resettodr() 119 { 120 struct plrtc_softc *sc = plrtc_sc; 121 122 /* The time hasn't been set yet, so avoid writing a dubious value 123 to the RTC. */ 124 if (!timeset) 125 return; 126 127 bus_space_write_4(sc->sc_iot, sc->sc_ioh, IFPGA_RTC_LR, time.tv_sec); 128 } 129