1 /* $OpenBSD: exrtc.c,v 1.5 2022/10/17 19:09:46 kettenis Exp $ */ 2 /* 3 * Copyright (c) 2017 Mark Kettenis <kettenis@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/param.h> 19 #include <sys/systm.h> 20 #include <sys/device.h> 21 #include <sys/time.h> 22 23 #include <machine/bus.h> 24 #include <machine/fdt.h> 25 26 #include <dev/ofw/openfirm.h> 27 #include <dev/ofw/fdt.h> 28 29 #include <dev/clock_subr.h> 30 31 #define RTCCTRL 0x40 32 #define RTCCTRL_RTCEN (1 << 0) 33 34 #define RTCSEC 0x70 35 #define RTCMIN 0x74 36 #define RTCHOUR 0x78 37 #define RTCDAY 0x7c 38 #define RTCMON 0x84 39 #define RTCYEAR 0x88 40 41 #define HREAD4(sc, reg) \ 42 (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))) 43 #define HWRITE4(sc, reg, val) \ 44 bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val)) 45 46 struct exrtc_softc { 47 struct device sc_dev; 48 bus_space_tag_t sc_iot; 49 bus_space_handle_t sc_ioh; 50 struct todr_chip_handle sc_todr; 51 }; 52 53 int exrtc_match(struct device *, void *, void *); 54 void exrtc_attach(struct device *, struct device *, void *); 55 56 const struct cfattach exrtc_ca = { 57 sizeof(struct exrtc_softc), exrtc_match, exrtc_attach 58 }; 59 60 struct cfdriver exrtc_cd = { 61 NULL, "exrtc", DV_DULL 62 }; 63 64 int exrtc_gettime(todr_chip_handle_t, struct timeval *); 65 int exrtc_settime(todr_chip_handle_t, struct timeval *); 66 67 int 68 exrtc_match(struct device *parent, void *match, void *aux) 69 { 70 struct fdt_attach_args *faa = aux; 71 72 return OF_is_compatible(faa->fa_node, "samsung,s3c6410-rtc"); 73 } 74 75 void 76 exrtc_attach(struct device *parent, struct device *self, void *aux) 77 { 78 struct exrtc_softc *sc = (struct exrtc_softc *)self; 79 struct fdt_attach_args *faa = aux; 80 81 sc->sc_iot = faa->fa_iot; 82 83 if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr, 84 faa->fa_reg[0].size, 0, &sc->sc_ioh)) 85 panic("%s: bus_space_map failed!", __func__); 86 87 printf("\n"); 88 89 sc->sc_todr.cookie = sc; 90 sc->sc_todr.todr_gettime = exrtc_gettime; 91 sc->sc_todr.todr_settime = exrtc_settime; 92 sc->sc_todr.todr_quality = 0; 93 todr_attach(&sc->sc_todr); 94 } 95 96 int 97 exrtc_gettime(todr_chip_handle_t handle, struct timeval *tv) 98 { 99 struct exrtc_softc *sc = handle->cookie; 100 struct clock_ymdhms dt; 101 int retried = 0; 102 103 retry: 104 dt.dt_sec = FROMBCD(HREAD4(sc, RTCSEC)); 105 dt.dt_min = FROMBCD(HREAD4(sc, RTCMIN)); 106 dt.dt_hour = FROMBCD(HREAD4(sc, RTCHOUR)); 107 dt.dt_day = FROMBCD(HREAD4(sc, RTCDAY)); 108 dt.dt_mon = FROMBCD(HREAD4(sc, RTCMON)); 109 dt.dt_year = FROMBCD(HREAD4(sc, RTCYEAR)) + 1900; 110 111 /* If the second counter rolled over, retry. */ 112 if (dt.dt_sec > FROMBCD(HREAD4(sc, RTCSEC)) && !retried) { 113 retried = 1; 114 goto retry; 115 } 116 117 if (dt.dt_sec > 59 || dt.dt_min > 59 || dt.dt_hour > 23 || 118 dt.dt_day > 31 || dt.dt_day == 0 || 119 dt.dt_mon > 12 || dt.dt_mon == 0 || 120 dt.dt_year < POSIX_BASE_YEAR) 121 return 1; 122 123 tv->tv_sec = clock_ymdhms_to_secs(&dt); 124 tv->tv_usec = 0; 125 return 0; 126 } 127 128 int 129 exrtc_settime(todr_chip_handle_t handle, struct timeval *tv) 130 { 131 struct exrtc_softc *sc = handle->cookie; 132 struct clock_ymdhms dt; 133 uint32_t val; 134 135 clock_secs_to_ymdhms(tv->tv_sec, &dt); 136 137 HWRITE4(sc, RTCSEC, TOBCD(dt.dt_sec)); 138 HWRITE4(sc, RTCMIN, TOBCD(dt.dt_min)); 139 HWRITE4(sc, RTCHOUR, TOBCD(dt.dt_hour)); 140 HWRITE4(sc, RTCDAY, TOBCD(dt.dt_day)); 141 HWRITE4(sc, RTCMON, TOBCD(dt.dt_mon)); 142 HWRITE4(sc, RTCYEAR, TOBCD(dt.dt_year - 1900)); 143 144 val = HREAD4(sc, RTCCTRL); 145 HWRITE4(sc, RTCCTRL, val | RTCCTRL_RTCEN); 146 147 return 0; 148 } 149