exrtc.c revision 1.3
1/* $OpenBSD: exrtc.c,v 1.3 2019/08/29 11:51:48 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 31extern todr_chip_handle_t todr_handle; 32 33#define RTCCTRL 0x40 34#define RTCCTRL_RTCEN (1 << 0) 35 36#define RTCSEC 0x70 37#define RTCMIN 0x74 38#define RTCHOUR 0x78 39#define RTCDAY 0x7c 40#define RTCMON 0x84 41#define RTCYEAR 0x88 42 43#define HREAD4(sc, reg) \ 44 (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))) 45#define HWRITE4(sc, reg, val) \ 46 bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val)) 47 48struct exrtc_softc { 49 struct device sc_dev; 50 bus_space_tag_t sc_iot; 51 bus_space_handle_t sc_ioh; 52 struct todr_chip_handle sc_todr; 53}; 54 55int exrtc_match(struct device *, void *, void *); 56void exrtc_attach(struct device *, struct device *, void *); 57 58struct cfattach exrtc_ca = { 59 sizeof(struct exrtc_softc), exrtc_match, exrtc_attach 60}; 61 62struct cfdriver exrtc_cd = { 63 NULL, "exrtc", DV_DULL 64}; 65 66int exrtc_gettime(todr_chip_handle_t, struct timeval *); 67int exrtc_settime(todr_chip_handle_t, struct timeval *); 68 69int 70exrtc_match(struct device *parent, void *match, void *aux) 71{ 72 struct fdt_attach_args *faa = aux; 73 74 return OF_is_compatible(faa->fa_node, "samsung,s3c6410-rtc"); 75} 76 77void 78exrtc_attach(struct device *parent, struct device *self, void *aux) 79{ 80 struct exrtc_softc *sc = (struct exrtc_softc *)self; 81 struct fdt_attach_args *faa = aux; 82 83 sc->sc_iot = faa->fa_iot; 84 85 if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr, 86 faa->fa_reg[0].size, 0, &sc->sc_ioh)) 87 panic("%s: bus_space_map failed!", __func__); 88 89 printf("\n"); 90 91 sc->sc_todr.cookie = sc; 92 sc->sc_todr.todr_gettime = exrtc_gettime; 93 sc->sc_todr.todr_settime = exrtc_settime; 94 todr_handle = &sc->sc_todr; 95} 96 97int 98exrtc_gettime(todr_chip_handle_t handle, struct timeval *tv) 99{ 100 struct exrtc_softc *sc = handle->cookie; 101 struct clock_ymdhms dt; 102 int retried = 0; 103 104retry: 105 dt.dt_sec = FROMBCD(HREAD4(sc, RTCSEC)); 106 dt.dt_min = FROMBCD(HREAD4(sc, RTCMIN)); 107 dt.dt_hour = FROMBCD(HREAD4(sc, RTCHOUR)); 108 dt.dt_day = FROMBCD(HREAD4(sc, RTCDAY)); 109 dt.dt_mon = FROMBCD(HREAD4(sc, RTCMON)); 110 dt.dt_year = FROMBCD(HREAD4(sc, RTCYEAR)) + 1900; 111 112 /* If the second counter rolled over, retry. */ 113 if (dt.dt_sec > FROMBCD(HREAD4(sc, RTCSEC)) && !retried) { 114 retried = 1; 115 goto retry; 116 } 117 118 if (dt.dt_sec > 59 || dt.dt_min > 59 || dt.dt_hour > 23 || 119 dt.dt_day > 31 || dt.dt_day == 0 || 120 dt.dt_mon > 12 || dt.dt_mon == 0 || 121 dt.dt_year < POSIX_BASE_YEAR) 122 return 1; 123 124 tv->tv_sec = clock_ymdhms_to_secs(&dt); 125 tv->tv_usec = 0; 126 return 0; 127} 128 129int 130exrtc_settime(todr_chip_handle_t handle, struct timeval *tv) 131{ 132 struct exrtc_softc *sc = handle->cookie; 133 struct clock_ymdhms dt; 134 uint32_t val; 135 136 clock_secs_to_ymdhms(tv->tv_sec, &dt); 137 138 HWRITE4(sc, RTCSEC, TOBCD(dt.dt_sec)); 139 HWRITE4(sc, RTCMIN, TOBCD(dt.dt_min)); 140 HWRITE4(sc, RTCHOUR, TOBCD(dt.dt_hour)); 141 HWRITE4(sc, RTCDAY, TOBCD(dt.dt_day)); 142 HWRITE4(sc, RTCMON, TOBCD(dt.dt_mon)); 143 HWRITE4(sc, RTCYEAR, TOBCD(dt.dt_year - 1900)); 144 145 val = HREAD4(sc, RTCCTRL); 146 HWRITE4(sc, RTCCTRL, val | RTCCTRL_RTCEN); 147 148 return 0; 149} 150