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/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id: pps.c,v 1.19 1999/05/31 11:25:00 phk Exp $
*
* This driver implements a draft-mogul-pps-api-02.txt PPS source.
*
* The input pin is pin#10
* The echo output pin is pin#14
*
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/timepps.h>
#include <sys/malloc.h>
#include <dev/ppbus/ppbconf.h>
#include "pps.h"
#define PPS_NAME "pps" /* our official name */
struct pps_data {
int pps_open;
struct ppb_device pps_dev;
struct pps_state pps;
};
static int npps;
/*
* Make ourselves visible as a ppbus driver
*/
static struct ppb_device *ppsprobe(struct ppb_data *ppb);
static int ppsattach(struct ppb_device *dev);
static void ppsintr(struct ppb_device *ppd);
static struct ppb_driver ppsdriver = {
ppsprobe, ppsattach, PPS_NAME
};
DATA_SET(ppbdriver_set, ppsdriver);
static d_open_t ppsopen;
static d_close_t ppsclose;
static d_ioctl_t ppsioctl;
#define CDEV_MAJOR 89
static struct cdevsw pps_cdevsw = {
/* open */ ppsopen,
/* close */ ppsclose,
/* read */ noread,
/* write */ nowrite,
/* ioctl */ ppsioctl,
/* stop */ nostop,
/* reset */ noreset,
/* devtotty */ nodevtotty,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ PPS_NAME,
/* parms */ noparms,
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
/* maxio */ 0,
/* bmaj */ -1
};
static struct ppb_device *
ppsprobe(struct ppb_data *ppb)
{
struct pps_data *sc;
static int once;
dev_t dev;
if (!once++)
cdevsw_add(&pps_cdevsw);
sc = (struct pps_data *) malloc(sizeof(struct pps_data),
M_TEMP, M_NOWAIT);
if (!sc) {
printf(PPS_NAME ": cannot malloc!\n");
return (0);
}
bzero(sc, sizeof(struct pps_data));
dev = make_dev(&pps_cdevsw, npps,
UID_ROOT, GID_WHEEL, 0644, PPS_NAME "%d", npps);
dev->si_drv1 = sc;
sc->pps_dev.id_unit = npps++;
sc->pps_dev.ppb = ppb;
sc->pps_dev.name = ppsdriver.name;
sc->pps_dev.bintr = ppsintr;
sc->pps_dev.drv1 = sc;
sc->pps.ppscap = PPS_CAPTUREASSERT | PPS_ECHOASSERT;
pps_init(&sc->pps);
return (&sc->pps_dev);
}
static int
ppsattach(struct ppb_device *dev)
{
/*
* Report ourselves
*/
printf(PPS_NAME "%d: <Pulse per second Timing Interface> on ppbus %d\n",
dev->id_unit, dev->ppb->ppb_link->adapter_unit);
return (1);
}
static int
ppsopen(dev_t dev, int flags, int fmt, struct proc *p)
{
struct pps_data *sc;
u_int unit = minor(dev);
if ((unit >= npps))
return (ENXIO);
sc = dev->si_drv1;
if (!sc->pps_open) {
if (ppb_request_bus(&sc->pps_dev, PPB_WAIT|PPB_INTR))
return (EINTR);
ppb_wctr(&sc->pps_dev, 0);
ppb_wctr(&sc->pps_dev, IRQENABLE);
sc->pps_open = 1;
}
return(0);
}
static int
ppsclose(dev_t dev, int flags, int fmt, struct proc *p)
{
struct pps_data *sc = dev->si_drv1;
sc->pps.ppsparam.mode = 0; /* PHK ??? */
ppb_wdtr(&sc->pps_dev, 0);
ppb_wctr(&sc->pps_dev, 0);
ppb_release_bus(&sc->pps_dev);
sc->pps_open = 0;
return(0);
}
static void
ppsintr(struct ppb_device *ppd)
{
struct pps_data *sc = ppd->drv1;
struct timecounter *tc;
unsigned count;
tc = timecounter;
count = timecounter->tc_get_timecount(tc);
if (!(ppb_rstr(&sc->pps_dev) & nACK))
return;
if (sc->pps.ppsparam.mode & PPS_ECHOASSERT)
ppb_wctr(&sc->pps_dev, IRQENABLE | AUTOFEED);
pps_event(&sc->pps, tc, count, PPS_CAPTUREASSERT);
if (sc->pps.ppsparam.mode & PPS_ECHOASSERT)
ppb_wctr(&sc->pps_dev, IRQENABLE);
}
static int
ppsioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
struct pps_data *sc = dev->si_drv1;
return (pps_ioctl(cmd, data, &sc->pps));
}
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