1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2000 Sascha Schumann. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY SASCHA SCHUMANN ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 17 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 18 * EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 21 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 22 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 23 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 24 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * 27 */ 28 29 #include <sys/cdefs.h> 30 #include "opt_pcfclock.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/sockio.h> 36 #include <sys/mbuf.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/conf.h> 40 #include <sys/fcntl.h> 41 #include <sys/uio.h> 42 43 #include <machine/bus.h> 44 #include <machine/resource.h> 45 46 #include <dev/ppbus/ppbconf.h> 47 #include <dev/ppbus/ppb_msq.h> 48 #include <dev/ppbus/ppbio.h> 49 50 #include "ppbus_if.h" 51 52 #define PCFCLOCK_NAME "pcfclock" 53 54 struct pcfclock_data { 55 device_t dev; 56 struct cdev *cdev; 57 }; 58 59 static d_open_t pcfclock_open; 60 static d_close_t pcfclock_close; 61 static d_read_t pcfclock_read; 62 63 static struct cdevsw pcfclock_cdevsw = { 64 .d_version = D_VERSION, 65 .d_open = pcfclock_open, 66 .d_close = pcfclock_close, 67 .d_read = pcfclock_read, 68 .d_name = PCFCLOCK_NAME, 69 }; 70 71 #ifndef PCFCLOCK_MAX_RETRIES 72 #define PCFCLOCK_MAX_RETRIES 10 73 #endif 74 75 #define AFC_HI 0 76 #define AFC_LO AUTOFEED 77 78 /* AUTO FEED is used as clock */ 79 #define AUTOFEED_CLOCK(val) \ 80 ctr = (ctr & ~(AUTOFEED)) ^ (val); ppb_wctr(ppbus, ctr) 81 82 /* SLCT is used as clock */ 83 #define CLOCK_OK \ 84 ((ppb_rstr(ppbus) & SELECT) == (i & 1 ? SELECT : 0)) 85 86 /* PE is used as data */ 87 #define BIT_SET (ppb_rstr(ppbus)&PERROR) 88 89 /* the first byte sent as reply must be 00001001b */ 90 #define PCFCLOCK_CORRECT_SYNC(buf) (buf[0] == 9) 91 92 #define NR(buf, off) (buf[off+1]*10+buf[off]) 93 94 /* check for correct input values */ 95 #define PCFCLOCK_CORRECT_FORMAT(buf) (\ 96 NR(buf, 14) <= 99 && \ 97 NR(buf, 12) <= 12 && \ 98 NR(buf, 10) <= 31 && \ 99 NR(buf, 6) <= 23 && \ 100 NR(buf, 4) <= 59 && \ 101 NR(buf, 2) <= 59) 102 103 #define PCFCLOCK_BATTERY_STATUS_LOW(buf) (buf[8] & 4) 104 105 #define PCFCLOCK_CMD_TIME 0 /* send current time */ 106 #define PCFCLOCK_CMD_COPY 7 /* copy received signal to PC */ 107 108 static void 109 pcfclock_identify(driver_t *driver, device_t parent) 110 { 111 112 device_t dev; 113 114 dev = device_find_child(parent, PCFCLOCK_NAME, -1); 115 if (!dev) 116 BUS_ADD_CHILD(parent, 0, PCFCLOCK_NAME, DEVICE_UNIT_ANY); 117 } 118 119 static int 120 pcfclock_probe(device_t dev) 121 { 122 123 device_set_desc(dev, "PCF-1.0"); 124 return (0); 125 } 126 127 static int 128 pcfclock_attach(device_t dev) 129 { 130 struct pcfclock_data *sc = device_get_softc(dev); 131 int unit; 132 133 unit = device_get_unit(dev); 134 135 sc->dev = dev; 136 sc->cdev = make_dev(&pcfclock_cdevsw, unit, 137 UID_ROOT, GID_WHEEL, 0400, PCFCLOCK_NAME "%d", unit); 138 if (sc->cdev == NULL) { 139 device_printf(dev, "Failed to create character device\n"); 140 return (ENXIO); 141 } 142 sc->cdev->si_drv1 = sc; 143 144 return (0); 145 } 146 147 static int 148 pcfclock_open(struct cdev *dev, int flag, int fms, struct thread *td) 149 { 150 struct pcfclock_data *sc = dev->si_drv1; 151 device_t pcfclockdev; 152 device_t ppbus; 153 int res; 154 155 if (!sc) 156 return (ENXIO); 157 pcfclockdev = sc->dev; 158 ppbus = device_get_parent(pcfclockdev); 159 160 ppb_lock(ppbus); 161 res = ppb_request_bus(ppbus, pcfclockdev, 162 (flag & O_NONBLOCK) ? PPB_DONTWAIT : PPB_WAIT); 163 ppb_unlock(ppbus); 164 return (res); 165 } 166 167 static int 168 pcfclock_close(struct cdev *dev, int flags, int fmt, struct thread *td) 169 { 170 struct pcfclock_data *sc = dev->si_drv1; 171 device_t pcfclockdev = sc->dev; 172 device_t ppbus = device_get_parent(pcfclockdev); 173 174 ppb_lock(ppbus); 175 ppb_release_bus(ppbus, pcfclockdev); 176 ppb_unlock(ppbus); 177 178 return (0); 179 } 180 181 static void 182 pcfclock_write_cmd(struct cdev *dev, unsigned char command) 183 { 184 struct pcfclock_data *sc = dev->si_drv1; 185 device_t pcfclockdev = sc->dev; 186 device_t ppbus = device_get_parent(pcfclockdev); 187 unsigned char ctr = 14; 188 char i; 189 190 for (i = 0; i <= 7; i++) { 191 ppb_wdtr(ppbus, i); 192 AUTOFEED_CLOCK(i & 1 ? AFC_HI : AFC_LO); 193 DELAY(3000); 194 } 195 ppb_wdtr(ppbus, command); 196 AUTOFEED_CLOCK(AFC_LO); 197 DELAY(3000); 198 AUTOFEED_CLOCK(AFC_HI); 199 } 200 201 static void 202 pcfclock_display_data(struct cdev *dev, char buf[18]) 203 { 204 struct pcfclock_data *sc = dev->si_drv1; 205 #ifdef PCFCLOCK_VERBOSE 206 int year; 207 208 year = NR(buf, 14); 209 if (year < 70) 210 year += 100; 211 212 device_printf(sc->dev, "%02d.%02d.%4d %02d:%02d:%02d, " 213 "battery status: %s\n", 214 NR(buf, 10), NR(buf, 12), 1900 + year, 215 NR(buf, 6), NR(buf, 4), NR(buf, 2), 216 PCFCLOCK_BATTERY_STATUS_LOW(buf) ? "LOW" : "ok"); 217 #else 218 if (PCFCLOCK_BATTERY_STATUS_LOW(buf)) 219 device_printf(sc->dev, "BATTERY STATUS LOW ON\n"); 220 #endif 221 } 222 223 static int 224 pcfclock_read_data(struct cdev *dev, char *buf, ssize_t bits) 225 { 226 struct pcfclock_data *sc = dev->si_drv1; 227 device_t pcfclockdev = sc->dev; 228 device_t ppbus = device_get_parent(pcfclockdev); 229 int i; 230 char waitfor; 231 int offset; 232 233 /* one byte per four bits */ 234 bzero(buf, ((bits + 3) >> 2) + 1); 235 236 waitfor = 100; 237 for (i = 0; i <= bits; i++) { 238 /* wait for clock, maximum (waitfor*100) usec */ 239 while (!CLOCK_OK && --waitfor > 0) 240 DELAY(100); 241 242 /* timed out? */ 243 if (!waitfor) 244 return (EIO); 245 246 waitfor = 100; /* reload */ 247 248 /* give it some time */ 249 DELAY(500); 250 251 /* calculate offset into buffer */ 252 offset = i >> 2; 253 buf[offset] <<= 1; 254 255 if (BIT_SET) 256 buf[offset] |= 1; 257 } 258 259 return (0); 260 } 261 262 static int 263 pcfclock_read_dev(struct cdev *dev, char *buf, int maxretries) 264 { 265 struct pcfclock_data *sc = dev->si_drv1; 266 device_t pcfclockdev = sc->dev; 267 device_t ppbus = device_get_parent(pcfclockdev); 268 int error = 0; 269 270 ppb_set_mode(ppbus, PPB_COMPATIBLE); 271 272 while (--maxretries > 0) { 273 pcfclock_write_cmd(dev, PCFCLOCK_CMD_TIME); 274 if (pcfclock_read_data(dev, buf, 68)) 275 continue; 276 277 if (!PCFCLOCK_CORRECT_SYNC(buf)) 278 continue; 279 280 if (!PCFCLOCK_CORRECT_FORMAT(buf)) 281 continue; 282 283 break; 284 } 285 286 if (!maxretries) 287 error = EIO; 288 289 return (error); 290 } 291 292 static int 293 pcfclock_read(struct cdev *dev, struct uio *uio, int ioflag) 294 { 295 struct pcfclock_data *sc = dev->si_drv1; 296 device_t ppbus; 297 char buf[18]; 298 int error = 0; 299 300 if (uio->uio_resid < 18) 301 return (ERANGE); 302 303 ppbus = device_get_parent(sc->dev); 304 ppb_lock(ppbus); 305 error = pcfclock_read_dev(dev, buf, PCFCLOCK_MAX_RETRIES); 306 ppb_unlock(ppbus); 307 308 if (error) { 309 device_printf(sc->dev, "no PCF found\n"); 310 } else { 311 pcfclock_display_data(dev, buf); 312 313 uiomove(buf, 18, uio); 314 } 315 316 return (error); 317 } 318 319 static device_method_t pcfclock_methods[] = { 320 /* device interface */ 321 DEVMETHOD(device_identify, pcfclock_identify), 322 DEVMETHOD(device_probe, pcfclock_probe), 323 DEVMETHOD(device_attach, pcfclock_attach), 324 { 0, 0 } 325 }; 326 327 static driver_t pcfclock_driver = { 328 PCFCLOCK_NAME, 329 pcfclock_methods, 330 sizeof(struct pcfclock_data), 331 }; 332 333 DRIVER_MODULE(pcfclock, ppbus, pcfclock_driver, 0, 0); 334