intersil7170.c revision 1.13
1 /* $NetBSD: intersil7170.c,v 1.13 2025/09/07 04:47:01 thorpej Exp $ */ 2 /*- 3 * Copyright (c) 2000 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Paul Kranenburg. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* 32 * Intersil 7170 time-of-day chip subroutines. 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: intersil7170.c,v 1.13 2025/09/07 04:47:01 thorpej Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/malloc.h> 40 #include <sys/systm.h> 41 #include <sys/device.h> 42 #include <sys/errno.h> 43 44 #include <sys/bus.h> 45 #include <dev/clock_subr.h> 46 #include <dev/ic/intersil7170reg.h> 47 #include <dev/ic/intersil7170var.h> 48 49 int intersil7170_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 50 int intersil7170_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 51 52 void 53 intersil7170_attach(struct intersil7170_softc *sc) 54 { 55 todr_chip_handle_t handle; 56 57 aprint_normal(": intersil7170"); 58 59 handle = &sc->sc_handle; 60 61 handle->cookie = sc; 62 handle->todr_gettime_ymdhms = intersil7170_gettime_ymdhms; 63 handle->todr_settime_ymdhms = intersil7170_settime_ymdhms; 64 65 todr_attach(handle); 66 } 67 68 /* 69 * Set up the system's time, given a `reasonable' time value. 70 */ 71 int 72 intersil7170_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt) 73 { 74 struct intersil7170_softc *sc = handle->cookie; 75 bus_space_tag_t bt = sc->sc_bst; 76 bus_space_handle_t bh = sc->sc_bsh; 77 uint8_t cmd; 78 int year; 79 int s; 80 81 /* No interrupts while we're fiddling with the chip */ 82 s = splhigh(); 83 84 /* Enable read (stop time) */ 85 cmd = INTERSIL_COMMAND(INTERSIL_CMD_STOP, INTERSIL_CMD_IENABLE); 86 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd); 87 88 /* The order of reading out the clock elements is important */ 89 (void)bus_space_read_1(bt, bh, INTERSIL_ICSEC); /* not used */ 90 dt->dt_hour = bus_space_read_1(bt, bh, INTERSIL_IHOUR); 91 dt->dt_min = bus_space_read_1(bt, bh, INTERSIL_IMIN); 92 dt->dt_sec = bus_space_read_1(bt, bh, INTERSIL_ISEC); 93 dt->dt_mon = bus_space_read_1(bt, bh, INTERSIL_IMON); 94 dt->dt_day = bus_space_read_1(bt, bh, INTERSIL_IDAY); 95 year = bus_space_read_1(bt, bh, INTERSIL_IYEAR); 96 dt->dt_wday = bus_space_read_1(bt, bh, INTERSIL_IDOW); 97 98 /* Done writing (time wears on) */ 99 cmd = INTERSIL_COMMAND(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE); 100 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd); 101 splx(s); 102 103 year += sc->sc_year0; 104 if (year < POSIX_BASE_YEAR && 105 (sc->sc_flag & INTERSIL7170_NO_CENT_ADJUST) == 0) 106 year += 100; 107 108 dt->dt_year = year; 109 110 return 0; 111 } 112 113 /* 114 * Reset the clock based on the current time. 115 */ 116 int 117 intersil7170_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt) 118 { 119 struct intersil7170_softc *sc = handle->cookie; 120 bus_space_tag_t bt = sc->sc_bst; 121 bus_space_handle_t bh = sc->sc_bsh; 122 uint8_t cmd; 123 int year; 124 int s; 125 126 year = dt->dt_year - sc->sc_year0; 127 if (year > 99 && (sc->sc_flag & INTERSIL7170_NO_CENT_ADJUST) == 0) 128 year -= 100; 129 130 /* No interrupts while we're fiddling with the chip */ 131 s = splhigh(); 132 133 /* Enable write (stop time) */ 134 cmd = INTERSIL_COMMAND(INTERSIL_CMD_STOP, INTERSIL_CMD_IENABLE); 135 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd); 136 137 /* The order of reading writing the clock elements is important */ 138 bus_space_write_1(bt, bh, INTERSIL_ICSEC, 0); 139 bus_space_write_1(bt, bh, INTERSIL_IHOUR, dt->dt_hour); 140 bus_space_write_1(bt, bh, INTERSIL_IMIN, dt->dt_min); 141 bus_space_write_1(bt, bh, INTERSIL_ISEC, dt->dt_sec); 142 bus_space_write_1(bt, bh, INTERSIL_IMON, dt->dt_mon); 143 bus_space_write_1(bt, bh, INTERSIL_IDAY, dt->dt_day); 144 bus_space_write_1(bt, bh, INTERSIL_IYEAR, year); 145 bus_space_write_1(bt, bh, INTERSIL_IDOW, dt->dt_wday); 146 147 /* Done writing (time wears on) */ 148 cmd = INTERSIL_COMMAND(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE); 149 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd); 150 splx(s); 151 152 return 0; 153 } 154
Indexes created Wed Oct 22 13:09:56 GMT 2025