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: src/sys/dev/ppbus/pps.c,v 1.24.2.1 2000/05/24 00:20:57 n_hibma Exp $ 10 * $DragonFly: src/sys/dev/misc/pps/pps.c,v 1.6 2004/01/30 05:42:15 dillon Exp $ 11 * 12 * This driver implements a draft-mogul-pps-api-02.txt PPS source. 13 * 14 * The input pin is pin#10 15 * The echo output pin is pin#14 16 * 17 */ 18 19 #include "use_pps.h" 20 21 #include <sys/param.h> 22 #include <sys/kernel.h> 23 #include <sys/systm.h> 24 #include <sys/module.h> 25 #include <sys/bus.h> 26 #include <sys/conf.h> 27 #include <sys/timepps.h> 28 #include <machine/bus.h> 29 #include <machine/resource.h> 30 #include <sys/rman.h> 31 32 #include <bus/ppbus/ppbconf.h> 33 #include "ppbus_if.h" 34 #include <bus/ppbus/ppbio.h> 35 36 #define PPS_NAME "pps" /* our official name */ 37 38 struct pps_data { 39 int pps_open; 40 struct ppb_device pps_dev; 41 struct pps_state pps; 42 43 struct resource *intr_resource; /* interrupt resource */ 44 void *intr_cookie; /* interrupt registration cookie */ 45 }; 46 47 static void ppsintr(void *arg); 48 49 #define DEVTOSOFTC(dev) \ 50 ((struct pps_data *)device_get_softc(dev)) 51 #define UNITOSOFTC(unit) \ 52 ((struct pps_data *)devclass_get_softc(pps_devclass, (unit))) 53 #define UNITODEVICE(unit) \ 54 (devclass_get_device(pps_devclass, (unit))) 55 56 static devclass_t pps_devclass; 57 58 static d_open_t ppsopen; 59 static d_close_t ppsclose; 60 static d_ioctl_t ppsioctl; 61 62 #define CDEV_MAJOR 89 63 static struct cdevsw pps_cdevsw = { 64 /* name */ PPS_NAME, 65 /* maj */ CDEV_MAJOR, 66 /* flags */ 0, 67 /* port */ NULL, 68 /* autoq */ 0, 69 70 /* open */ ppsopen, 71 /* close */ ppsclose, 72 /* read */ noread, 73 /* write */ nowrite, 74 /* ioctl */ ppsioctl, 75 /* poll */ nopoll, 76 /* mmap */ nommap, 77 /* strategy */ nostrategy, 78 /* dump */ nodump, 79 /* psize */ nopsize 80 }; 81 82 static void 83 ppsidentify(driver_t *driver, device_t parent) 84 { 85 86 BUS_ADD_CHILD(parent, 0, PPS_NAME, 0); 87 } 88 89 static int 90 ppsprobe(device_t ppsdev) 91 { 92 struct pps_data *sc; 93 dev_t dev; 94 int unit; 95 96 sc = DEVTOSOFTC(ppsdev); 97 bzero(sc, sizeof(struct pps_data)); 98 99 unit = device_get_unit(ppsdev); 100 dev = make_dev(&pps_cdevsw, unit, 101 UID_ROOT, GID_WHEEL, 0644, PPS_NAME "%d", unit); 102 103 device_set_desc(ppsdev, "Pulse per second Timing Interface"); 104 105 sc->pps.ppscap = PPS_CAPTUREASSERT | PPS_ECHOASSERT; 106 pps_init(&sc->pps); 107 return (0); 108 } 109 110 static int 111 ppsattach(device_t dev) 112 { 113 struct pps_data *sc = DEVTOSOFTC(dev); 114 device_t ppbus = device_get_parent(dev); 115 int irq, zero = 0; 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 == 0) 127 return (ENXIO); 128 129 return (0); 130 } 131 132 static int 133 ppsopen(dev_t dev, int flags, int fmt, struct thread *td) 134 { 135 u_int unit = minor(dev); 136 struct pps_data *sc = UNITOSOFTC(unit); 137 device_t ppsdev = UNITODEVICE(unit); 138 device_t ppbus = device_get_parent(ppsdev); 139 int error; 140 141 if (!sc->pps_open) { 142 if (ppb_request_bus(ppbus, ppsdev, PPB_WAIT|PPB_INTR)) 143 return (EINTR); 144 145 /* attach the interrupt handler */ 146 if ((error = BUS_SETUP_INTR(ppbus, ppsdev, sc->intr_resource, 147 INTR_TYPE_TTY, ppsintr, ppsdev, 148 &sc->intr_cookie))) { 149 ppb_release_bus(ppbus, ppsdev); 150 return (error); 151 } 152 153 ppb_wctr(ppbus, 0); 154 ppb_wctr(ppbus, IRQENABLE); 155 sc->pps_open = 1; 156 } 157 158 return(0); 159 } 160 161 static int 162 ppsclose(dev_t dev, int flags, int fmt, struct thread *td) 163 { 164 u_int unit = minor(dev); 165 struct pps_data *sc = UNITOSOFTC(unit); 166 device_t ppsdev = UNITODEVICE(unit); 167 device_t ppbus = device_get_parent(ppsdev); 168 169 sc->pps.ppsparam.mode = 0; /* PHK ??? */ 170 171 ppb_wdtr(ppbus, 0); 172 ppb_wctr(ppbus, 0); 173 174 /* Note: the interrupt handler is automatically detached */ 175 ppb_release_bus(ppbus, ppsdev); 176 sc->pps_open = 0; 177 return(0); 178 } 179 180 static void 181 ppsintr(void *arg) 182 { 183 device_t ppsdev = (device_t)arg; 184 device_t ppbus = device_get_parent(ppsdev); 185 struct pps_data *sc = DEVTOSOFTC(ppsdev); 186 sysclock_t count; 187 188 count = cputimer_get_count(); 189 if (!(ppb_rstr(ppbus) & nACK)) 190 return; 191 if (sc->pps.ppsparam.mode & PPS_ECHOASSERT) 192 ppb_wctr(ppbus, IRQENABLE | AUTOFEED); 193 pps_event(&sc->pps, count, PPS_CAPTUREASSERT); 194 if (sc->pps.ppsparam.mode & PPS_ECHOASSERT) 195 ppb_wctr(ppbus, IRQENABLE); 196 } 197 198 static int 199 ppsioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) 200 { 201 u_int unit = minor(dev); 202 struct pps_data *sc = UNITOSOFTC(unit); 203 204 return (pps_ioctl(cmd, data, &sc->pps)); 205 } 206 207 static device_method_t pps_methods[] = { 208 /* device interface */ 209 DEVMETHOD(device_identify, ppsidentify), 210 DEVMETHOD(device_probe, ppsprobe), 211 DEVMETHOD(device_attach, ppsattach), 212 213 { 0, 0 } 214 }; 215 216 static driver_t pps_driver = { 217 PPS_NAME, 218 pps_methods, 219 sizeof(struct pps_data), 220 }; 221 DRIVER_MODULE(pps, ppbus, pps_driver, pps_devclass, 0, 0); 222