183 lines
3.9 KiB
C
183 lines
3.9 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $Id: pps.c,v 1.15 1999/03/13 16:22:18 phk Exp $
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*
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* This driver implements a draft-mogul-pps-api-02.txt PPS source.
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*
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* The input pin is pin#10
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* The echo output pin is pin#14
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*
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*/
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#include "opt_devfs.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/timepps.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif
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#include <sys/malloc.h>
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#include <dev/ppbus/ppbconf.h>
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#include "pps.h"
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#define PPS_NAME "lppps" /* our official name */
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static struct pps_data {
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int pps_unit;
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int pps_open;
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struct ppb_device pps_dev;
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struct pps_state pps;
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} *softc[NPPS];
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static int npps;
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/*
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* Make ourselves visible as a ppbus driver
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*/
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static struct ppb_device *ppsprobe(struct ppb_data *ppb);
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static int ppsattach(struct ppb_device *dev);
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static void ppsintr(int unit);
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static void pps_drvinit(void *unused);
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static struct ppb_driver ppsdriver = {
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ppsprobe, ppsattach, PPS_NAME
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};
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DATA_SET(ppbdriver_set, ppsdriver);
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static d_open_t ppsopen;
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static d_close_t ppsclose;
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static d_ioctl_t ppsioctl;
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#define CDEV_MAJOR 89
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static struct cdevsw pps_cdevsw =
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{ ppsopen, ppsclose, noread, nowrite,
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ppsioctl, nullstop, nullreset, nodevtotty,
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seltrue, nommap, nostrat, PPS_NAME,
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NULL, -1 };
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static struct ppb_device *
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ppsprobe(struct ppb_data *ppb)
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{
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struct pps_data *sc;
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sc = (struct pps_data *) malloc(sizeof(struct pps_data),
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M_TEMP, M_NOWAIT);
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if (!sc) {
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printf(PPS_NAME ": cannot malloc!\n");
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return (0);
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}
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bzero(sc, sizeof(struct pps_data));
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softc[npps] = sc;
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sc->pps_unit = npps++;
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sc->pps_dev.id_unit = sc->pps_unit;
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sc->pps_dev.ppb = ppb;
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sc->pps_dev.name = ppsdriver.name;
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sc->pps_dev.intr = ppsintr;
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sc->pps.ppscap = PPS_CAPTUREASSERT | PPS_ECHOASSERT;
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pps_init(&sc->pps);
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return (&sc->pps_dev);
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}
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static int
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ppsattach(struct ppb_device *dev)
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{
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dev_t devt;
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/*
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* Report ourselves
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*/
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printf(PPS_NAME "%d: <Pulse per second Timing Interface> on ppbus %d\n",
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dev->id_unit, dev->ppb->ppb_link->adapter_unit);
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#ifdef DEVFS
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devfs_add_devswf(&pps_cdevsw,
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dev->id_unit, DV_CHR,
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UID_ROOT, GID_WHEEL, 0600, PPS_NAME "%d", dev->id_unit);
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#endif
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devt = makedev(CDEV_MAJOR, 0);
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cdevsw_add(&devt, &pps_cdevsw, NULL);
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return (1);
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}
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static int
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ppsopen(dev_t dev, int flags, int fmt, struct proc *p)
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{
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struct pps_data *sc;
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u_int unit = minor(dev);
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if ((unit >= npps))
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return (ENXIO);
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sc = softc[unit];
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if (!sc->pps_open) {
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if (ppb_request_bus(&sc->pps_dev, PPB_WAIT|PPB_INTR))
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return (EINTR);
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ppb_wctr(&sc->pps_dev, 0);
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ppb_wctr(&sc->pps_dev, IRQENABLE);
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sc->pps_open = 1;
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}
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return(0);
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}
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static int
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ppsclose(dev_t dev, int flags, int fmt, struct proc *p)
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{
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struct pps_data *sc = softc[minor(dev)];
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sc->pps.ppsparam.mode = 0; /* PHK ??? */
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ppb_wdtr(&sc->pps_dev, 0);
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ppb_wctr(&sc->pps_dev, 0);
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ppb_release_bus(&sc->pps_dev);
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sc->pps_open = 0;
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return(0);
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}
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static void
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ppsintr(int unit)
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{
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struct pps_data *sc = softc[unit];
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struct timecounter *tc;
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unsigned count;
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tc = timecounter;
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count = timecounter->tc_get_timecount(tc);
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if (!(ppb_rstr(&sc->pps_dev) & nACK))
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return;
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if (sc->pps.ppsparam.mode & PPS_ECHOASSERT)
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ppb_wctr(&sc->pps_dev, IRQENABLE | AUTOFEED);
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pps_event(&sc->pps, tc, count, PPS_CAPTUREASSERT);
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if (sc->pps.ppsparam.mode & PPS_ECHOASSERT)
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ppb_wctr(&sc->pps_dev, IRQENABLE);
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}
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static int
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ppsioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
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{
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struct pps_data *sc = softc[minor(dev)];
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return (pps_ioctl(cmd, data, &sc->pps));
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}
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