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/timetc.h> 25 #include <sys/timepps.h> 26 #include <machine/bus.h> 27 #include <machine/resource.h> 28 #include <sys/rman.h> 29 30 #include <dev/ppbus/ppbconf.h> 31 #include "ppbus_if.h" 32 #include <dev/ppbus/ppbio.h> 33 34 #define PPS_NAME "pps" /* our official name */ 35 36 struct pps_data { 37 int pps_open; 38 struct ppb_device pps_dev; 39 struct pps_state pps; 40 41 struct resource *intr_resource; /* interrupt resource */ 42 void *intr_cookie; /* interrupt registration cookie */ 43 }; 44 45 static void ppsintr(void *arg); 46 47 #define DEVTOSOFTC(dev) \ 48 ((struct pps_data *)device_get_softc(dev)) 49 #define UNITOSOFTC(unit) \ 50 ((struct pps_data *)devclass_get_softc(pps_devclass, (unit))) 51 #define UNITODEVICE(unit) \ 52 (devclass_get_device(pps_devclass, (unit))) 53 54 static devclass_t pps_devclass; 55 56 static d_open_t ppsopen; 57 static d_close_t ppsclose; 58 static d_ioctl_t ppsioctl; 59 60 #define CDEV_MAJOR 89 61 static struct cdevsw pps_cdevsw = { 62 /* open */ ppsopen, 63 /* close */ ppsclose, 64 /* read */ noread, 65 /* write */ nowrite, 66 /* ioctl */ ppsioctl, 67 /* poll */ nopoll, 68 /* mmap */ nommap, 69 /* strategy */ nostrategy, 70 /* name */ PPS_NAME, 71 /* maj */ CDEV_MAJOR, 72 /* dump */ nodump, 73 /* psize */ nopsize, 74 /* flags */ 0, 75 }; 76 77 static void 78 ppsidentify(driver_t *driver, device_t parent) 79 { 80 81 BUS_ADD_CHILD(parent, 0, PPS_NAME, 0); 82 } 83 84 static int 85 ppsprobe(device_t ppsdev) 86 { 87 struct pps_data *sc; 88 dev_t dev; 89 int unit; 90 91 sc = DEVTOSOFTC(ppsdev); 92 bzero(sc, sizeof(struct pps_data)); 93 94 unit = device_get_unit(ppsdev); 95 dev = make_dev(&pps_cdevsw, unit, 96 UID_ROOT, GID_WHEEL, 0644, PPS_NAME "%d", unit); 97 98 device_set_desc(ppsdev, "Pulse per second Timing Interface"); 99 100 sc->pps.ppscap = PPS_CAPTUREASSERT | PPS_ECHOASSERT; 101 pps_init(&sc->pps); 102 return (0); 103 } 104 105 static int 106 ppsattach(device_t dev) 107 { 108 struct pps_data *sc = DEVTOSOFTC(dev); 109 device_t ppbus = device_get_parent(dev); 110 int irq, zero = 0; 111 112 /* retrieve the ppbus irq */ 113 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 114 115 if (irq > 0) { 116 /* declare our interrupt handler */ 117 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 118 &zero, irq, irq, 1, RF_SHAREABLE); 119 } 120 /* interrupts seem mandatory */ 121 if (sc->intr_resource == 0) 122 return (ENXIO); 123 124 return (0); 125 } 126 127 static int 128 ppsopen(dev_t dev, int flags, int fmt, struct proc *p) 129 { 130 u_int unit = minor(dev); 131 struct pps_data *sc = UNITOSOFTC(unit); 132 device_t ppsdev = UNITODEVICE(unit); 133 device_t ppbus = device_get_parent(ppsdev); 134 int error; 135 136 if (!sc->pps_open) { 137 if (ppb_request_bus(ppbus, ppsdev, PPB_WAIT|PPB_INTR)) 138 return (EINTR); 139 140 /* attach the interrupt handler */ 141 if ((error = BUS_SETUP_INTR(ppbus, ppsdev, sc->intr_resource, 142 INTR_TYPE_TTY, ppsintr, ppsdev, 143 &sc->intr_cookie))) { 144 ppb_release_bus(ppbus, ppsdev); 145 return (error); 146 } 147 148 ppb_wctr(ppbus, 0); 149 ppb_wctr(ppbus, IRQENABLE); 150 sc->pps_open = 1; 151 } 152 153 return(0); 154 } 155 156 static int 157 ppsclose(dev_t dev, int flags, int fmt, struct proc *p) 158 { 159 u_int unit = minor(dev); 160 struct pps_data *sc = UNITOSOFTC(unit); 161 device_t ppsdev = UNITODEVICE(unit); 162 device_t ppbus = device_get_parent(ppsdev); 163 164 sc->pps.ppsparam.mode = 0; /* PHK ??? */ 165 166 ppb_wdtr(ppbus, 0); 167 ppb_wctr(ppbus, 0); 168 169 /* Note: the interrupt handler is automatically detached */ 170 ppb_release_bus(ppbus, ppsdev); 171 sc->pps_open = 0; 172 return(0); 173 } 174 175 static void 176 ppsintr(void *arg) 177 { 178 device_t ppsdev = (device_t)arg; 179 device_t ppbus = device_get_parent(ppsdev); 180 struct pps_data *sc = DEVTOSOFTC(ppsdev); 181 struct timecounter *tc; 182 unsigned count; 183 184 tc = timecounter; 185 count = timecounter->tc_get_timecount(tc); 186 if (!(ppb_rstr(ppbus) & nACK)) 187 return; 188 if (sc->pps.ppsparam.mode & PPS_ECHOASSERT) 189 ppb_wctr(ppbus, IRQENABLE | AUTOFEED); 190 pps_event(&sc->pps, tc, count, PPS_CAPTUREASSERT); 191 if (sc->pps.ppsparam.mode & PPS_ECHOASSERT) 192 ppb_wctr(ppbus, IRQENABLE); 193 } 194 195 static int 196 ppsioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 197 { 198 u_int unit = minor(dev); 199 struct pps_data *sc = UNITOSOFTC(unit); 200 201 return (pps_ioctl(cmd, data, &sc->pps)); 202 } 203 204 static device_method_t pps_methods[] = { 205 /* device interface */ 206 DEVMETHOD(device_identify, ppsidentify), 207 DEVMETHOD(device_probe, ppsprobe), 208 DEVMETHOD(device_attach, ppsattach), 209 210 { 0, 0 } 211 }; 212 213 static driver_t pps_driver = { 214 PPS_NAME, 215 pps_methods, 216 sizeof(struct pps_data), 217 }; 218 DRIVER_MODULE(pps, ppbus, pps_driver, pps_devclass, 0, 0); 219