intersil7170.c revision 1.5.8.1
1 /* $NetBSD: intersil7170.c,v 1.5.8.1 2006/09/14 12:31:30 yamt 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 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the NetBSD 20 * Foundation, Inc. and its contributors. 21 * 4. Neither the name of The NetBSD Foundation nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Intersil 7170 time-of-day chip subroutines. 40 */ 41 42 #include <sys/cdefs.h> 43 __KERNEL_RCSID(0, "$NetBSD: intersil7170.c,v 1.5.8.1 2006/09/14 12:31:30 yamt Exp $"); 44 45 #include <sys/param.h> 46 #include <sys/malloc.h> 47 #include <sys/systm.h> 48 #include <sys/errno.h> 49 50 #include <machine/bus.h> 51 #include <dev/clock_subr.h> 52 #include <dev/ic/intersil7170.h> 53 54 #define intersil_command(run, interrupt) \ 55 (run | interrupt | INTERSIL_CMD_FREQ_32K | INTERSIL_CMD_24HR_MODE | \ 56 INTERSIL_CMD_NORMAL_MODE) 57 58 struct intersil7170_softc { 59 bus_space_tag_t sil_bt; 60 bus_space_handle_t sil_bh; 61 int sil_year0; 62 }; 63 64 int intersil7170_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 65 int intersil7170_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 66 67 int intersil7170_auto_century_adjust = 1; 68 69 todr_chip_handle_t 70 intersil7170_attach(bus_space_tag_t bt, bus_space_handle_t bh, int year0) 71 { 72 todr_chip_handle_t handle; 73 struct intersil7170_softc *sil; 74 int sz; 75 76 printf(": intersil7170"); 77 78 sz = ALIGN(sizeof(struct todr_chip_handle)) + sizeof(struct intersil7170); 79 handle = malloc(sz, M_DEVBUF, M_NOWAIT); 80 sil = (struct intersil7170_softc *)((u_long)handle + 81 ALIGN(sizeof(struct todr_chip_handle))); 82 handle->cookie = sil; 83 handle->todr_gettime = NULL; 84 handle->todr_settime = NULL; 85 handle->todr_setwen = NULL; 86 handle->todr_gettime_ymdhms = intersil7170_gettime_ymdhms; 87 handle->todr_settime_ymdhms = intersil7170_settime_ymdhms; 88 sil->sil_bt = bt; 89 sil->sil_bh = bh; 90 sil->sil_year0 = year0; 91 92 return (handle); 93 } 94 95 /* 96 * Set up the system's time, given a `reasonable' time value. 97 */ 98 int 99 intersil7170_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt) 100 { 101 struct intersil7170_softc *sil = handle->cookie; 102 bus_space_tag_t bt = sil->sil_bt; 103 bus_space_handle_t bh = sil->sil_bh; 104 u_int8_t cmd; 105 int year; 106 int s; 107 108 /* No interrupts while we're fiddling with the chip */ 109 s = splhigh(); 110 111 /* Enable read (stop time) */ 112 cmd = intersil_command(INTERSIL_CMD_STOP, INTERSIL_CMD_IENABLE); 113 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd); 114 115 /* The order of reading out the clock elements is important */ 116 bus_space_read_1(bt, bh, INTERSIL_ICSEC); /* not used */ 117 dt->dt_hour = bus_space_read_1(bt, bh, INTERSIL_IHOUR); 118 dt->dt_min = bus_space_read_1(bt, bh, INTERSIL_IMIN); 119 dt->dt_sec = bus_space_read_1(bt, bh, INTERSIL_ISEC); 120 dt->dt_mon = bus_space_read_1(bt, bh, INTERSIL_IMON); 121 dt->dt_day = bus_space_read_1(bt, bh, INTERSIL_IDAY); 122 year = bus_space_read_1(bt, bh, INTERSIL_IYEAR); 123 dt->dt_wday = bus_space_read_1(bt, bh, INTERSIL_IDOW); 124 125 /* Done writing (time wears on) */ 126 cmd = intersil_command(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE); 127 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd); 128 splx(s); 129 130 year += sil->sil_year0; 131 if (year < 1970 && intersil7170_auto_century_adjust != 0) 132 year += 100; 133 134 dt->dt_year = year; 135 136 return (0); 137 } 138 139 /* 140 * Reset the clock based on the current time. 141 */ 142 int 143 intersil7170_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt) 144 { 145 struct intersil7170_softc *sil = handle->cookie; 146 bus_space_tag_t bt = sil->sil_bt; 147 bus_space_handle_t bh = sil->sil_bh; 148 u_int8_t cmd; 149 int year; 150 int s; 151 152 year = dt->dt_year - sil->sil_year0; 153 if (year > 99 && intersil7170_auto_century_adjust != 0) 154 year -= 100; 155 156 /* No interrupts while we're fiddling with the chip */ 157 s = splhigh(); 158 159 /* Enable write (stop time) */ 160 cmd = intersil_command(INTERSIL_CMD_STOP, INTERSIL_CMD_IENABLE); 161 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd); 162 163 /* The order of reading writing the clock elements is important */ 164 bus_space_write_1(bt, bh, INTERSIL_ICSEC, 0); 165 bus_space_write_1(bt, bh, INTERSIL_IHOUR, dt->dt_hour); 166 bus_space_write_1(bt, bh, INTERSIL_IMIN, dt->dt_min); 167 bus_space_write_1(bt, bh, INTERSIL_ISEC, dt->dt_sec); 168 bus_space_write_1(bt, bh, INTERSIL_IMON, dt->dt_mon); 169 bus_space_write_1(bt, bh, INTERSIL_IDAY, dt->dt_day); 170 bus_space_write_1(bt, bh, INTERSIL_IYEAR, year); 171 bus_space_write_1(bt, bh, INTERSIL_IDOW, dt->dt_wday); 172 173 /* Done writing (time wears on) */ 174 cmd = intersil_command(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE); 175 bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd); 176 splx(s); 177 178 return (0); 179 } 180
Indexes created Wed Oct 22 13:09:56 GMT 2025