dsrtc.c revision 1.9
1 /* $NetBSD: dsrtc.c,v 1.9 2006/09/11 19:14:57 gdamore Exp $ */ 2 3 /* 4 * Copyright (c) 1998 Mark Brinicombe. 5 * Copyright (c) 1998 Causality Limited. 6 * All rights reserved. 7 * 8 * Written by Mark Brinicombe, Causality Limited 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Mark Brinicombe 21 * for the NetBSD Project. 22 * 4. The name of the company nor the name of the author may be used to 23 * endorse or promote products derived from this software without specific 24 * prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY CAUASLITY LIMITED ``AS IS'' AND ANY EXPRESS 27 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 28 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 29 * DISCLAIMED. IN NO EVENT SHALL CAUSALITY LIMITED OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: dsrtc.c,v 1.9 2006/09/11 19:14:57 gdamore Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/conf.h> 46 #include <sys/device.h> 47 48 #include <machine/rtc.h> 49 50 #include <arm/footbridge/todclockvar.h> 51 #include <arm/footbridge/isa/ds1687reg.h> 52 53 #include <dev/isa/isavar.h> 54 55 #define NRTC_PORTS 2 56 57 struct dsrtc_softc { 58 struct device sc_dev; 59 bus_space_tag_t sc_iot; 60 bus_space_handle_t sc_ioh; 61 }; 62 63 void dsrtcattach(struct device *parent, struct device *self, void *aux); 64 int dsrtcmatch(struct device *parent, struct cfdata *cf, void *aux); 65 int ds1687_read(struct dsrtc_softc *sc, int addr); 66 void ds1687_write(struct dsrtc_softc *sc, int addr, int data); 67 #if 0 68 int ds1687_ram_read(struct dsrtc_softc *sc, int addr); 69 void ds1687_ram_write(struct dsrtc_softc *sc, int addr, int data); 70 #endif 71 static void ds1687_bank_select(struct dsrtc_softc *, int); 72 static int dsrtc_write(void *, rtc_t *); 73 static int dsrtc_read(void *, rtc_t *); 74 75 int 76 ds1687_read(struct dsrtc_softc *sc, int addr) 77 { 78 79 bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_ADDR_REG, addr); 80 return(bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_DATA_REG)); 81 } 82 83 void 84 ds1687_write(struct dsrtc_softc *sc, int addr, int data) 85 { 86 87 bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_ADDR_REG, addr); 88 bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_DATA_REG, data); 89 } 90 91 static void 92 ds1687_bank_select(struct dsrtc_softc *sc, int bank) 93 { 94 int data; 95 96 data = ds1687_read(sc, RTC_REG_A); 97 data &= ~RTC_REG_A_BANK_MASK; 98 if (bank) 99 data |= RTC_REG_A_BANK1; 100 ds1687_write(sc, RTC_REG_A, data); 101 } 102 103 #if 0 104 /* Nothing uses these yet */ 105 int 106 ds1687_ram_read(struct dsrtc_softc *sc, int addr) 107 { 108 if (addr < RTC_PC_RAM_SIZE) 109 return(ds1687_read(sc, RTC_PC_RAM_START + addr)); 110 111 addr -= RTC_PC_RAM_SIZE; 112 if (addr < RTC_BANK0_RAM_SIZE) 113 return(ds1687_read(sc, RTC_BANK0_RAM_START + addr)); 114 115 addr -= RTC_BANK0_RAM_SIZE; 116 if (addr < RTC_EXT_RAM_SIZE) { 117 int data; 118 119 ds1687_bank_select(sc, 1); 120 ds1687_write(sc, RTC_EXT_RAM_ADDRESS, addr); 121 data = ds1687_read(sc, RTC_EXT_RAM_DATA); 122 ds1687_bank_select(sc, 0); 123 return(data); 124 } 125 return(-1); 126 } 127 128 void 129 ds1687_ram_write(struct dsrtc_softc *sc, int addr, int val) 130 { 131 if (addr < RTC_PC_RAM_SIZE) 132 return(ds1687_write(sc, RTC_PC_RAM_START + addr, val)); 133 134 addr -= RTC_PC_RAM_SIZE; 135 if (addr < RTC_BANK0_RAM_SIZE) 136 return(ds1687_write(sc, RTC_BANK0_RAM_START + addr, val)); 137 138 addr -= RTC_BANK0_RAM_SIZE; 139 if (addr < RTC_EXT_RAM_SIZE) { 140 ds1687_bank_select(sc, 1); 141 ds1687_write(sc, RTC_EXT_RAM_ADDRESS, addr); 142 ds1687_write(sc, RTC_EXT_RAM_DATA, val); 143 ds1687_bank_select(sc, 0); 144 } 145 } 146 #endif 147 148 static int 149 dsrtc_write(void *arg, rtc_t *rtc) 150 { 151 struct dsrtc_softc *sc = arg; 152 153 ds1687_write(sc, RTC_SECONDS, rtc->rtc_sec); 154 ds1687_write(sc, RTC_MINUTES, rtc->rtc_min); 155 ds1687_write(sc, RTC_HOURS, rtc->rtc_hour); 156 ds1687_write(sc, RTC_DAYOFMONTH, rtc->rtc_day); 157 ds1687_write(sc, RTC_MONTH, rtc->rtc_mon); 158 ds1687_write(sc, RTC_YEAR, rtc->rtc_year); 159 ds1687_bank_select(sc, 1); 160 ds1687_write(sc, RTC_CENTURY, rtc->rtc_cen); 161 ds1687_bank_select(sc, 0); 162 return(1); 163 } 164 165 static int 166 dsrtc_read(void *arg, rtc_t *rtc) 167 { 168 struct dsrtc_softc *sc = arg; 169 170 rtc->rtc_micro = 0; 171 rtc->rtc_centi = 0; 172 rtc->rtc_sec = ds1687_read(sc, RTC_SECONDS); 173 rtc->rtc_min = ds1687_read(sc, RTC_MINUTES); 174 rtc->rtc_hour = ds1687_read(sc, RTC_HOURS); 175 rtc->rtc_day = ds1687_read(sc, RTC_DAYOFMONTH); 176 rtc->rtc_mon = ds1687_read(sc, RTC_MONTH); 177 rtc->rtc_year = ds1687_read(sc, RTC_YEAR); 178 ds1687_bank_select(sc, 1); 179 rtc->rtc_cen = ds1687_read(sc, RTC_CENTURY); 180 ds1687_bank_select(sc, 0); 181 182 return(1); 183 } 184 185 /* device and attach structures */ 186 CFATTACH_DECL(ds1687rtc, sizeof(struct dsrtc_softc), 187 dsrtcmatch, dsrtcattach, NULL, NULL); 188 189 /* 190 * dsrtcmatch() 191 * 192 * Validate the IIC address to make sure its an RTC we understand 193 */ 194 195 int 196 dsrtcmatch(struct device *parent, struct cfdata *cf, void *aux) 197 { 198 struct isa_attach_args *ia = aux; 199 200 if (ia->ia_nio < 1 || 201 ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT) 202 return (0); 203 204 ia->ia_nio = 1; 205 ia->ia_io[0].ir_size = NRTC_PORTS; 206 207 ia->ia_niomem = 0; 208 ia->ia_nirq = 0; 209 ia->ia_ndrq = 0; 210 211 return(1); 212 } 213 214 /* 215 * dsrtcattach() 216 * 217 * Attach the rtc device 218 */ 219 220 void 221 dsrtcattach(struct device *parent, struct device *self, void *aux) 222 { 223 struct dsrtc_softc *sc = (struct dsrtc_softc *)self; 224 struct isa_attach_args *ia = aux; 225 struct todclock_attach_args ta; 226 227 sc->sc_iot = ia->ia_iot; 228 if (bus_space_map(sc->sc_iot, ia->ia_io[0].ir_addr, 229 ia->ia_io[0].ir_size, 0, &sc->sc_ioh)) { 230 printf(": cannot map I/O space\n"); 231 return; 232 } 233 234 ds1687_write(sc, RTC_REG_A, RTC_REG_A_DV1); 235 ds1687_write(sc, RTC_REG_B, RTC_REG_B_BINARY | RTC_REG_B_24_HOUR); 236 237 if (!(ds1687_read(sc, RTC_REG_D) & RTC_REG_D_VRT)) 238 printf(": lithium cell is dead, RTC unreliable"); 239 printf("\n"); 240 241 ta.ta_name = "todclock"; 242 ta.ta_rtc_arg = sc; 243 ta.ta_rtc_write = dsrtc_write; 244 ta.ta_rtc_read = dsrtc_read; 245 ta.ta_flags = 0; 246 config_found(self, &ta, NULL); 247 } 248 249 /* End of dsrtc.c */ 250
Indexes created Sun Sep 28 07:09:56 GMT 2025