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 * $FreeBSD$ 10 * 11 * This driver implements a draft-mogul-pps-api-02.txt PPS source. 12 * 13 * The input pin is pin#10 14 * The echo output pin is pin#14 15 * 16 */ 17 18 #include <sys/param.h> 19 #include <sys/kernel.h> 20 #include <sys/systm.h> 21 #include <sys/module.h> 22 #include <sys/bus.h> 23 #include <sys/conf.h> 24 #include <sys/timepps.h> 25 #include <machine/bus.h> 26 #include <machine/resource.h> 27 #include <sys/rman.h> 28 29 #include <dev/ppbus/ppbconf.h> 30 #include "ppbus_if.h" 31 #include <dev/ppbus/ppbio.h> 32 33 #define PPS_NAME "pps" /* our official name */ 34 35 #define PRVERBOSE(arg...) if (bootverbose) printf(##arg); 36 37 struct pps_data { 38 struct ppb_device pps_dev; 39 struct pps_state pps[9]; 40 dev_t devs[9]; 41 device_t ppsdev; 42 device_t ppbus; 43 int busy; 44 struct callout_handle timeout; 45 int lastdata; 46 47 struct resource *intr_resource; /* interrupt resource */ 48 void *intr_cookie; /* interrupt registration cookie */ 49 }; 50 51 static void ppsintr(void *arg); 52 static void ppshcpoll(void *arg); 53 54 #define DEVTOSOFTC(dev) \ 55 ((struct pps_data *)device_get_softc(dev)) 56 57 static devclass_t pps_devclass; 58 59 static d_open_t ppsopen; 60 static d_close_t ppsclose; 61 static d_ioctl_t ppsioctl; 62 63 #define CDEV_MAJOR 89 64 static struct cdevsw pps_cdevsw = { 65 /* open */ ppsopen, 66 /* close */ ppsclose, 67 /* read */ noread, 68 /* write */ nowrite, 69 /* ioctl */ ppsioctl, 70 /* poll */ nopoll, 71 /* mmap */ nommap, 72 /* strategy */ nostrategy, 73 /* name */ PPS_NAME, 74 /* maj */ CDEV_MAJOR, 75 /* dump */ nodump, 76 /* psize */ nopsize, 77 /* flags */ 0, 78 }; 79 80 static void 81 ppsidentify(driver_t *driver, device_t parent) 82 { 83 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 int irq, zero = 0; 112 dev_t d; 113 int unit, i; 114 115 bzero(sc, sizeof(struct pps_data)); /* XXX doesn't newbus do this? */ 116 117 /* retrieve the ppbus irq */ 118 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 119 120 if (irq > 0) { 121 /* declare our interrupt handler */ 122 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 123 &zero, irq, irq, 1, RF_SHAREABLE); 124 } 125 /* interrupts seem mandatory */ 126 if (sc->intr_resource == NULL) 127 return (ENXIO); 128 129 sc->ppsdev = dev; 130 sc->ppbus = ppbus; 131 unit = device_get_unit(ppbus); 132 d = make_dev(&pps_cdevsw, unit, 133 UID_ROOT, GID_WHEEL, 0644, PPS_NAME "%d", unit); 134 sc->devs[0] = d; 135 sc->pps[0].ppscap = PPS_CAPTUREASSERT | PPS_ECHOASSERT; 136 d->si_drv1 = sc; 137 d->si_drv2 = (void*)0; 138 pps_init(&sc->pps[0]); 139 140 if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) 141 return (0); 142 143 do { 144 i = ppb_set_mode(sc->ppbus, PPB_EPP); 145 PRVERBOSE("EPP: %d %d\n", i, PPB_IN_EPP_MODE(sc->ppbus)); 146 if (i == -1) 147 break; 148 i = 0; 149 ppb_wctr(ppbus, i); 150 if (ppstry(ppbus, 0x00, 0x00)) 151 break; 152 if (ppstry(ppbus, 0x55, 0x55)) 153 break; 154 if (ppstry(ppbus, 0xaa, 0xaa)) 155 break; 156 if (ppstry(ppbus, 0xff, 0xff)) 157 break; 158 159 i = IRQENABLE | PCD | STROBE | nINIT | SELECTIN; 160 ppb_wctr(ppbus, i); 161 PRVERBOSE("CTR = %02x (%02x)\n", ppb_rctr(ppbus), i); 162 if (ppstry(ppbus, 0x00, 0x00)) 163 break; 164 if (ppstry(ppbus, 0x55, 0x00)) 165 break; 166 if (ppstry(ppbus, 0xaa, 0x00)) 167 break; 168 if (ppstry(ppbus, 0xff, 0x00)) 169 break; 170 171 i = IRQENABLE | PCD | nINIT | SELECTIN; 172 ppb_wctr(ppbus, i); 173 PRVERBOSE("CTR = %02x (%02x)\n", ppb_rctr(ppbus), i); 174 ppstry(ppbus, 0x00, 0xff); 175 ppstry(ppbus, 0x55, 0xff); 176 ppstry(ppbus, 0xaa, 0xff); 177 ppstry(ppbus, 0xff, 0xff); 178 179 for (i = 1; i < 9; i++) { 180 d = make_dev(&pps_cdevsw, unit + 0x10000 * i, 181 UID_ROOT, GID_WHEEL, 0644, PPS_NAME "%db%d", unit, i - 1); 182 sc->devs[i] = d; 183 sc->pps[i].ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 184 d->si_drv1 = sc; 185 d->si_drv2 = (void*)i; 186 pps_init(&sc->pps[i]); 187 } 188 } while (0); 189 i = ppb_set_mode(sc->ppbus, PPB_COMPATIBLE); 190 ppb_release_bus(ppbus, dev); 191 192 return (0); 193 } 194 195 static int 196 ppsopen(dev_t dev, int flags, int fmt, struct thread *td) 197 { 198 struct pps_data *sc = dev->si_drv1; 199 int subdev = (int)dev->si_drv2; 200 int error, i; 201 202 if (!sc->busy) { 203 device_t ppsdev = sc->ppsdev; 204 device_t ppbus = sc->ppbus; 205 206 if (ppb_request_bus(ppbus, ppsdev, PPB_WAIT|PPB_INTR)) 207 return (EINTR); 208 209 /* attach the interrupt handler */ 210 if ((error = BUS_SETUP_INTR(ppbus, ppsdev, sc->intr_resource, 211 INTR_TYPE_TTY, ppsintr, ppsdev, 212 &sc->intr_cookie))) { 213 ppb_release_bus(ppbus, ppsdev); 214 return (error); 215 } 216 217 i = ppb_set_mode(sc->ppbus, PPB_PS2); 218 PRVERBOSE("EPP: %d %d\n", i, PPB_IN_EPP_MODE(sc->ppbus)); 219 220 i = IRQENABLE | PCD | nINIT | SELECTIN; 221 ppb_wctr(ppbus, i); 222 } 223 if (subdev > 0 && !(sc->busy & ~1)) { 224 sc->timeout = timeout(ppshcpoll, sc, 1); 225 sc->lastdata = ppb_rdtr(sc->ppbus); 226 } 227 sc->busy |= (1 << subdev); 228 return(0); 229 } 230 231 static int 232 ppsclose(dev_t dev, int flags, int fmt, struct thread *td) 233 { 234 struct pps_data *sc = dev->si_drv1; 235 int subdev = (int)dev->si_drv2; 236 237 sc->pps[subdev].ppsparam.mode = 0; /* PHK ??? */ 238 sc->busy &= ~(1 << subdev); 239 if (subdev > 0 && !(sc->busy & ~1)) 240 untimeout(ppshcpoll, sc, sc->timeout); 241 if (!sc->busy) { 242 device_t ppsdev = sc->ppsdev; 243 device_t ppbus = sc->ppbus; 244 245 ppb_wdtr(ppbus, 0); 246 ppb_wctr(ppbus, 0); 247 248 /* Note: the interrupt handler is automatically detached */ 249 ppb_set_mode(ppbus, PPB_COMPATIBLE); 250 ppb_release_bus(ppbus, ppsdev); 251 } 252 return(0); 253 } 254 255 static void 256 ppshcpoll(void *arg) 257 { 258 struct pps_data *sc = arg; 259 int i, j, k, l; 260 261 if (!(sc->busy & ~1)) 262 return; 263 sc->timeout = timeout(ppshcpoll, sc, 1); 264 i = ppb_rdtr(sc->ppbus); 265 if (i == sc->lastdata) 266 return; 267 l = sc->lastdata ^ i; 268 k = 1; 269 for (j = 1; j < 9; j ++) { 270 if (l & k) { 271 pps_capture(&sc->pps[j]); 272 pps_event(&sc->pps[j], 273 i & k ? PPS_CAPTUREASSERT : PPS_CAPTURECLEAR); 274 } 275 k += k; 276 } 277 sc->lastdata = i; 278 } 279 280 static void 281 ppsintr(void *arg) 282 { 283 device_t ppsdev = (device_t)arg; 284 struct pps_data *sc = DEVTOSOFTC(ppsdev); 285 device_t ppbus = sc->ppbus; 286 287 pps_capture(&sc->pps[0]); 288 if (!(ppb_rstr(ppbus) & nACK)) 289 return; 290 if (sc->pps[0].ppsparam.mode & PPS_ECHOASSERT) 291 ppb_wctr(ppbus, IRQENABLE | AUTOFEED); 292 pps_event(&sc->pps[0], PPS_CAPTUREASSERT); 293 if (sc->pps[0].ppsparam.mode & PPS_ECHOASSERT) 294 ppb_wctr(ppbus, IRQENABLE); 295 } 296 297 static int 298 ppsioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) 299 { 300 struct pps_data *sc = dev->si_drv1; 301 int subdev = (int)dev->si_drv2; 302 303 return (pps_ioctl(cmd, data, &sc->pps[subdev])); 304 } 305 306 static device_method_t pps_methods[] = { 307 /* device interface */ 308 DEVMETHOD(device_identify, ppsidentify), 309 DEVMETHOD(device_probe, ppsprobe), 310 DEVMETHOD(device_attach, ppsattach), 311 312 { 0, 0 } 313 }; 314 315 static driver_t pps_driver = { 316 PPS_NAME, 317 pps_methods, 318 sizeof(struct pps_data), 319 }; 320 DRIVER_MODULE(pps, ppbus, pps_driver, pps_devclass, 0, 0); 321