Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/ppbus/pps.c
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1 /*- 2 * ---------------------------------------------------------------------------- 3 * "THE BEER-WARE LICENSE" (Revision 42): 4 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you 5 * can do whatever you want with this stuff. If we meet some day, and you think 6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7 * ---------------------------------------------------------------------------- 8 * 9 * 10 * This driver implements a draft-mogul-pps-api-02.txt PPS source. 11 * 12 * The input pin is pin#10 13 * The echo output pin is pin#14 14 * 15 */ 16 17 #include <sys/cdefs.h> 18 __FBSDID("$FreeBSD$"); 19 20 #include <sys/param.h> 21 #include <sys/lock.h> 22 #include <sys/kernel.h> 23 #include <sys/systm.h> 24 #include <sys/module.h> 25 #include <sys/sx.h> 26 #include <sys/bus.h> 27 #include <sys/conf.h> 28 #include <sys/timepps.h> 29 #include <machine/bus.h> 30 #include <machine/resource.h> 31 #include <sys/rman.h> 32 33 #include <dev/ppbus/ppbconf.h> 34 #include "ppbus_if.h" 35 #include <dev/ppbus/ppbio.h> 36 37 #define PPS_NAME "pps" /* our official name */ 38 39 #define PRVERBOSE(fmt, arg...) if (bootverbose) printf(fmt, ##arg); 40 41 struct pps_data { 42 struct ppb_device pps_dev; 43 struct pps_state pps[9]; 44 struct cdev *devs[9]; 45 device_t ppsdev; 46 device_t ppbus; 47 int busy; 48 struct callout timeout; 49 int lastdata; 50 51 struct sx lock; 52 struct resource *intr_resource; /* interrupt resource */ 53 void *intr_cookie; /* interrupt registration cookie */ 54 }; 55 56 static void ppsintr(void *arg); 57 static void ppshcpoll(void *arg); 58 59 #define DEVTOSOFTC(dev) \ 60 ((struct pps_data *)device_get_softc(dev)) 61 62 static devclass_t pps_devclass; 63 64 static d_open_t ppsopen; 65 static d_close_t ppsclose; 66 static d_ioctl_t ppsioctl; 67 68 static struct cdevsw pps_cdevsw = { 69 .d_version = D_VERSION, 70 .d_open = ppsopen, 71 .d_close = ppsclose, 72 .d_ioctl = ppsioctl, 73 .d_name = PPS_NAME, 74 }; 75 76 static void 77 ppsidentify(driver_t *driver, device_t parent) 78 { 79 80 device_t dev; 81 82 dev = device_find_child(parent, PPS_NAME, -1); 83 if (!dev) 84 BUS_ADD_CHILD(parent, 0, PPS_NAME, -1); 85 } 86 87 static int 88 ppstry(device_t ppbus, int send, int expect) 89 { 90 int i; 91 92 ppb_wdtr(ppbus, send); 93 i = ppb_rdtr(ppbus); 94 PRVERBOSE("S: %02x E: %02x G: %02x\n", send, expect, i); 95 return (i != expect); 96 } 97 98 static int 99 ppsprobe(device_t ppsdev) 100 { 101 device_set_desc(ppsdev, "Pulse per second Timing Interface"); 102 103 return (0); 104 } 105 106 static int 107 ppsattach(device_t dev) 108 { 109 struct pps_data *sc = DEVTOSOFTC(dev); 110 device_t ppbus = device_get_parent(dev); 111 struct cdev *d; 112 int error, i, unit, rid = 0; 113 114 /* declare our interrupt handler */ 115 sc->intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 116 RF_SHAREABLE); 117 118 /* interrupts seem mandatory */ 119 if (sc->intr_resource == NULL) { 120 device_printf(dev, "Unable to allocate interrupt resource\n"); 121 return (ENXIO); 122 } 123 124 error = bus_setup_intr(dev, sc->intr_resource, 125 INTR_TYPE_TTY | INTR_MPSAFE, NULL, ppsintr, 126 sc, &sc->intr_cookie); 127 if (error) { 128 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->intr_resource); 129 device_printf(dev, "Unable to register interrupt handler\n"); 130 return (error); 131 } 132 133 sx_init(&sc->lock, "pps"); 134 ppb_init_callout(ppbus, &sc->timeout, 0); 135 sc->ppsdev = dev; 136 sc->ppbus = ppbus; 137 unit = device_get_unit(ppbus); 138 d = make_dev(&pps_cdevsw, unit, 139 UID_ROOT, GID_WHEEL, 0600, PPS_NAME "%d", unit); 140 sc->devs[0] = d; 141 sc->pps[0].ppscap = PPS_CAPTUREASSERT | PPS_ECHOASSERT; 142 d->si_drv1 = sc; 143 d->si_drv2 = (void*)0; 144 pps_init(&sc->pps[0]); 145 146 ppb_lock(ppbus); 147 if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) { 148 ppb_unlock(ppbus); 149 return (0); 150 } 151 152 do { 153 i = ppb_set_mode(sc->ppbus, PPB_EPP); 154 PRVERBOSE("EPP: %d %d\n", i, PPB_IN_EPP_MODE(sc->ppbus)); 155 if (i == -1) 156 break; 157 i = 0; 158 ppb_wctr(ppbus, i); 159 if (ppstry(ppbus, 0x00, 0x00)) 160 break; 161 if (ppstry(ppbus, 0x55, 0x55)) 162 break; 163 if (ppstry(ppbus, 0xaa, 0xaa)) 164 break; 165 if (ppstry(ppbus, 0xff, 0xff)) 166 break; 167 168 i = IRQENABLE | PCD | STROBE | nINIT | SELECTIN; 169 ppb_wctr(ppbus, i); 170 PRVERBOSE("CTR = %02x (%02x)\n", ppb_rctr(ppbus), i); 171 if (ppstry(ppbus, 0x00, 0x00)) 172 break; 173 if (ppstry(ppbus, 0x55, 0x00)) 174 break; 175 if (ppstry(ppbus, 0xaa, 0x00)) 176 break; 177 if (ppstry(ppbus, 0xff, 0x00)) 178 break; 179 180 i = IRQENABLE | PCD | nINIT | SELECTIN; 181 ppb_wctr(ppbus, i); 182 PRVERBOSE("CTR = %02x (%02x)\n", ppb_rctr(ppbus), i); 183 ppstry(ppbus, 0x00, 0xff); 184 ppstry(ppbus, 0x55, 0xff); 185 ppstry(ppbus, 0xaa, 0xff); 186 ppstry(ppbus, 0xff, 0xff); 187 ppb_unlock(ppbus); 188 189 for (i = 1; i < 9; i++) { 190 d = make_dev(&pps_cdevsw, unit + 0x10000 * i, 191 UID_ROOT, GID_WHEEL, 0600, PPS_NAME "%db%d", unit, i - 1); 192 sc->devs[i] = d; 193 sc->pps[i].ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 194 d->si_drv1 = sc; 195 d->si_drv2 = (void *)(intptr_t)i; 196 pps_init(&sc->pps[i]); 197 } 198 ppb_lock(ppbus); 199 } while (0); 200 i = ppb_set_mode(sc->ppbus, PPB_COMPATIBLE); 201 ppb_release_bus(ppbus, dev); 202 ppb_unlock(ppbus); 203 204 return (0); 205 } 206 207 static int 208 ppsopen(struct cdev *dev, int flags, int fmt, struct thread *td) 209 { 210 struct pps_data *sc = dev->si_drv1; 211 device_t ppbus = sc->ppbus; 212 int subdev = (intptr_t)dev->si_drv2; 213 int i; 214 215 /* 216 * The sx lock is here solely to serialize open()'s to close 217 * the race of concurrent open()'s when pps(4) doesn't own the 218 * ppbus. 219 */ 220 sx_xlock(&sc->lock); 221 ppb_lock(ppbus); 222 if (!sc->busy) { 223 device_t ppsdev = sc->ppsdev; 224 225 if (ppb_request_bus(ppbus, ppsdev, PPB_WAIT|PPB_INTR)) { 226 ppb_unlock(ppbus); 227 sx_xunlock(&sc->lock); 228 return (EINTR); 229 } 230 231 i = ppb_set_mode(sc->ppbus, PPB_PS2); 232 PRVERBOSE("EPP: %d %d\n", i, PPB_IN_EPP_MODE(sc->ppbus)); 233 234 i = IRQENABLE | PCD | nINIT | SELECTIN; 235 ppb_wctr(ppbus, i); 236 } 237 if (subdev > 0 && !(sc->busy & ~1)) { 238 /* XXX: Timeout of 1? hz/100 instead perhaps? */ 239 callout_reset(&sc->timeout, 1, ppshcpoll, sc); 240 sc->lastdata = ppb_rdtr(sc->ppbus); 241 } 242 sc->busy |= (1 << subdev); 243 ppb_unlock(ppbus); 244 sx_xunlock(&sc->lock); 245 return(0); 246 } 247 248 static int 249 ppsclose(struct cdev *dev, int flags, int fmt, struct thread *td) 250 { 251 struct pps_data *sc = dev->si_drv1; 252 int subdev = (intptr_t)dev->si_drv2; 253 254 sx_xlock(&sc->lock); 255 sc->pps[subdev].ppsparam.mode = 0; /* PHK ??? */ 256 ppb_lock(sc->ppbus); 257 sc->busy &= ~(1 << subdev); 258 if (subdev > 0 && !(sc->busy & ~1)) 259 callout_stop(&sc->timeout); 260 if (!sc->busy) { 261 device_t ppsdev = sc->ppsdev; 262 device_t ppbus = sc->ppbus; 263 264 ppb_wdtr(ppbus, 0); 265 ppb_wctr(ppbus, 0); 266 267 ppb_set_mode(ppbus, PPB_COMPATIBLE); 268 ppb_release_bus(ppbus, ppsdev); 269 } 270 ppb_unlock(sc->ppbus); 271 sx_xunlock(&sc->lock); 272 return(0); 273 } 274 275 static void 276 ppshcpoll(void *arg) 277 { 278 struct pps_data *sc = arg; 279 int i, j, k, l; 280 281 KASSERT(sc->busy & ~1, ("pps polling w/o opened devices")); 282 i = ppb_rdtr(sc->ppbus); 283 if (i == sc->lastdata) 284 return; 285 l = sc->lastdata ^ i; 286 k = 1; 287 for (j = 1; j < 9; j ++) { 288 if (l & k) { 289 pps_capture(&sc->pps[j]); 290 pps_event(&sc->pps[j], 291 i & k ? PPS_CAPTUREASSERT : PPS_CAPTURECLEAR); 292 } 293 k += k; 294 } 295 sc->lastdata = i; 296 callout_reset(&sc->timeout, 1, ppshcpoll, sc); 297 } 298 299 static void 300 ppsintr(void *arg) 301 { 302 struct pps_data *sc = (struct pps_data *)arg; 303 304 ppb_assert_locked(sc->ppbus); 305 pps_capture(&sc->pps[0]); 306 if (!(ppb_rstr(sc->ppbus) & nACK)) 307 return; 308 309 if (sc->pps[0].ppsparam.mode & PPS_ECHOASSERT) 310 ppb_wctr(sc->ppbus, IRQENABLE | AUTOFEED); 311 pps_event(&sc->pps[0], PPS_CAPTUREASSERT); 312 if (sc->pps[0].ppsparam.mode & PPS_ECHOASSERT) 313 ppb_wctr(sc->ppbus, IRQENABLE); 314 } 315 316 static int 317 ppsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 318 { 319 struct pps_data *sc = dev->si_drv1; 320 int subdev = (intptr_t)dev->si_drv2; 321 int err; 322 323 ppb_lock(sc->ppbus); 324 err = pps_ioctl(cmd, data, &sc->pps[subdev]); 325 ppb_unlock(sc->ppbus); 326 return (err); 327 } 328 329 static device_method_t pps_methods[] = { 330 /* device interface */ 331 DEVMETHOD(device_identify, ppsidentify), 332 DEVMETHOD(device_probe, ppsprobe), 333 DEVMETHOD(device_attach, ppsattach), 334 335 { 0, 0 } 336 }; 337 338 static driver_t pps_driver = { 339 PPS_NAME, 340 pps_methods, 341 sizeof(struct pps_data), 342 }; 343 DRIVER_MODULE(pps, ppbus, pps_driver, pps_devclass, 0, 0); 344 MODULE_DEPEND(pps, ppbus, 1, 1, 1);
Cache object: 040c0d77ef8c7328d1494ee0f1be6aef
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