347 lines
8.0 KiB
C
347 lines
8.0 KiB
C
/*-
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* SPDX-License-Identifier: Beerware
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*
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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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*
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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 <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/module.h>
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#include <sys/sx.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/timepps.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/rman.h>
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#include <dev/ppbus/ppbconf.h>
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#include "ppbus_if.h"
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#include <dev/ppbus/ppbio.h>
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#define PPS_NAME "pps" /* our official name */
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#define PRVERBOSE(fmt, arg...) if (bootverbose) printf(fmt, ##arg);
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struct pps_data {
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struct ppb_device pps_dev;
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struct pps_state pps[9];
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struct cdev *devs[9];
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device_t ppsdev;
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device_t ppbus;
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int busy;
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struct callout timeout;
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int lastdata;
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struct sx lock;
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struct resource *intr_resource; /* interrupt resource */
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void *intr_cookie; /* interrupt registration cookie */
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};
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static void ppsintr(void *arg);
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static void ppshcpoll(void *arg);
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#define DEVTOSOFTC(dev) \
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((struct pps_data *)device_get_softc(dev))
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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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static struct cdevsw pps_cdevsw = {
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.d_version = D_VERSION,
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.d_open = ppsopen,
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.d_close = ppsclose,
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.d_ioctl = ppsioctl,
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.d_name = PPS_NAME,
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};
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static void
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ppsidentify(driver_t *driver, device_t parent)
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{
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device_t dev;
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dev = device_find_child(parent, PPS_NAME, -1);
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if (!dev)
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BUS_ADD_CHILD(parent, 0, PPS_NAME, -1);
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}
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static int
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ppstry(device_t ppbus, int send, int expect)
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{
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int i;
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ppb_wdtr(ppbus, send);
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i = ppb_rdtr(ppbus);
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PRVERBOSE("S: %02x E: %02x G: %02x\n", send, expect, i);
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return (i != expect);
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}
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static int
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ppsprobe(device_t ppsdev)
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{
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device_set_desc(ppsdev, "Pulse per second Timing Interface");
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return (0);
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}
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static int
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ppsattach(device_t dev)
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{
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struct pps_data *sc = DEVTOSOFTC(dev);
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device_t ppbus = device_get_parent(dev);
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struct cdev *d;
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int error, i, unit, rid = 0;
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/* declare our interrupt handler */
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sc->intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
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RF_SHAREABLE);
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/* interrupts seem mandatory */
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if (sc->intr_resource == NULL) {
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device_printf(dev, "Unable to allocate interrupt resource\n");
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return (ENXIO);
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}
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error = bus_setup_intr(dev, sc->intr_resource,
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INTR_TYPE_TTY | INTR_MPSAFE, NULL, ppsintr,
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sc, &sc->intr_cookie);
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if (error) {
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bus_release_resource(dev, SYS_RES_IRQ, 0, sc->intr_resource);
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device_printf(dev, "Unable to register interrupt handler\n");
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return (error);
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}
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sx_init(&sc->lock, "pps");
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ppb_init_callout(ppbus, &sc->timeout, 0);
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sc->ppsdev = dev;
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sc->ppbus = ppbus;
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unit = device_get_unit(ppbus);
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d = make_dev(&pps_cdevsw, unit,
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UID_ROOT, GID_WHEEL, 0600, PPS_NAME "%d", unit);
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sc->devs[0] = d;
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sc->pps[0].ppscap = PPS_CAPTUREASSERT | PPS_ECHOASSERT;
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sc->pps[0].driver_abi = PPS_ABI_VERSION;
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sc->pps[0].driver_mtx = ppb_get_lock(ppbus);
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d->si_drv1 = sc;
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d->si_drv2 = (void*)0;
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pps_init_abi(&sc->pps[0]);
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ppb_lock(ppbus);
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if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) {
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ppb_unlock(ppbus);
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return (0);
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}
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do {
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i = ppb_set_mode(sc->ppbus, PPB_EPP);
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PRVERBOSE("EPP: %d %d\n", i, PPB_IN_EPP_MODE(sc->ppbus));
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if (i == -1)
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break;
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i = 0;
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ppb_wctr(ppbus, i);
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if (ppstry(ppbus, 0x00, 0x00))
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break;
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if (ppstry(ppbus, 0x55, 0x55))
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break;
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if (ppstry(ppbus, 0xaa, 0xaa))
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break;
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if (ppstry(ppbus, 0xff, 0xff))
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break;
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i = IRQENABLE | PCD | STROBE | nINIT | SELECTIN;
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ppb_wctr(ppbus, i);
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PRVERBOSE("CTR = %02x (%02x)\n", ppb_rctr(ppbus), i);
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if (ppstry(ppbus, 0x00, 0x00))
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break;
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if (ppstry(ppbus, 0x55, 0x00))
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break;
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if (ppstry(ppbus, 0xaa, 0x00))
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break;
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if (ppstry(ppbus, 0xff, 0x00))
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break;
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i = IRQENABLE | PCD | nINIT | SELECTIN;
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ppb_wctr(ppbus, i);
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PRVERBOSE("CTR = %02x (%02x)\n", ppb_rctr(ppbus), i);
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ppstry(ppbus, 0x00, 0xff);
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ppstry(ppbus, 0x55, 0xff);
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ppstry(ppbus, 0xaa, 0xff);
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ppstry(ppbus, 0xff, 0xff);
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ppb_unlock(ppbus);
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for (i = 1; i < 9; i++) {
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d = make_dev(&pps_cdevsw, unit + 0x10000 * i,
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UID_ROOT, GID_WHEEL, 0600, PPS_NAME "%db%d", unit, i - 1);
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sc->devs[i] = d;
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sc->pps[i].ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR;
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sc->pps[i].driver_abi = PPS_ABI_VERSION;
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sc->pps[i].driver_mtx = ppb_get_lock(ppbus);
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d->si_drv1 = sc;
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d->si_drv2 = (void *)(intptr_t)i;
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pps_init_abi(&sc->pps[i]);
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}
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ppb_lock(ppbus);
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} while (0);
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i = ppb_set_mode(sc->ppbus, PPB_COMPATIBLE);
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ppb_release_bus(ppbus, dev);
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ppb_unlock(ppbus);
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return (0);
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}
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static int
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ppsopen(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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struct pps_data *sc = dev->si_drv1;
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device_t ppbus = sc->ppbus;
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int subdev = (intptr_t)dev->si_drv2;
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int i;
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/*
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* The sx lock is here solely to serialize open()'s to close
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* the race of concurrent open()'s when pps(4) doesn't own the
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* ppbus.
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*/
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sx_xlock(&sc->lock);
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ppb_lock(ppbus);
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if (!sc->busy) {
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device_t ppsdev = sc->ppsdev;
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if (ppb_request_bus(ppbus, ppsdev, PPB_WAIT|PPB_INTR)) {
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ppb_unlock(ppbus);
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sx_xunlock(&sc->lock);
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return (EINTR);
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}
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i = ppb_set_mode(sc->ppbus, PPB_PS2);
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PRVERBOSE("EPP: %d %d\n", i, PPB_IN_EPP_MODE(sc->ppbus));
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i = IRQENABLE | PCD | nINIT | SELECTIN;
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ppb_wctr(ppbus, i);
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}
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if (subdev > 0 && !(sc->busy & ~1)) {
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/* XXX: Timeout of 1? hz/100 instead perhaps? */
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callout_reset(&sc->timeout, 1, ppshcpoll, sc);
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sc->lastdata = ppb_rdtr(sc->ppbus);
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}
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sc->busy |= (1 << subdev);
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ppb_unlock(ppbus);
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sx_xunlock(&sc->lock);
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return(0);
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}
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static int
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ppsclose(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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struct pps_data *sc = dev->si_drv1;
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int subdev = (intptr_t)dev->si_drv2;
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sx_xlock(&sc->lock);
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sc->pps[subdev].ppsparam.mode = 0; /* PHK ??? */
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ppb_lock(sc->ppbus);
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sc->busy &= ~(1 << subdev);
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if (subdev > 0 && !(sc->busy & ~1))
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callout_stop(&sc->timeout);
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if (!sc->busy) {
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device_t ppsdev = sc->ppsdev;
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device_t ppbus = sc->ppbus;
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ppb_wdtr(ppbus, 0);
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ppb_wctr(ppbus, 0);
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ppb_set_mode(ppbus, PPB_COMPATIBLE);
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ppb_release_bus(ppbus, ppsdev);
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}
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ppb_unlock(sc->ppbus);
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sx_xunlock(&sc->lock);
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return(0);
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}
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static void
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ppshcpoll(void *arg)
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{
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struct pps_data *sc = arg;
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int i, j, k, l;
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KASSERT(sc->busy & ~1, ("pps polling w/o opened devices"));
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i = ppb_rdtr(sc->ppbus);
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if (i == sc->lastdata)
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return;
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l = sc->lastdata ^ i;
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k = 1;
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for (j = 1; j < 9; j ++) {
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if (l & k) {
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pps_capture(&sc->pps[j]);
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pps_event(&sc->pps[j],
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i & k ? PPS_CAPTUREASSERT : PPS_CAPTURECLEAR);
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}
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k += k;
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}
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sc->lastdata = i;
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callout_reset(&sc->timeout, 1, ppshcpoll, sc);
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}
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static void
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ppsintr(void *arg)
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{
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struct pps_data *sc = (struct pps_data *)arg;
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ppb_assert_locked(sc->ppbus);
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pps_capture(&sc->pps[0]);
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if (!(ppb_rstr(sc->ppbus) & nACK))
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return;
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if (sc->pps[0].ppsparam.mode & PPS_ECHOASSERT)
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ppb_wctr(sc->ppbus, IRQENABLE | AUTOFEED);
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pps_event(&sc->pps[0], PPS_CAPTUREASSERT);
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if (sc->pps[0].ppsparam.mode & PPS_ECHOASSERT)
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ppb_wctr(sc->ppbus, IRQENABLE);
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}
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static int
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ppsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
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{
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struct pps_data *sc = dev->si_drv1;
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int subdev = (intptr_t)dev->si_drv2;
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int err;
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ppb_lock(sc->ppbus);
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err = pps_ioctl(cmd, data, &sc->pps[subdev]);
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ppb_unlock(sc->ppbus);
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return (err);
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}
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static device_method_t pps_methods[] = {
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/* device interface */
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DEVMETHOD(device_identify, ppsidentify),
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DEVMETHOD(device_probe, ppsprobe),
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DEVMETHOD(device_attach, ppsattach),
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{ 0, 0 }
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};
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static driver_t pps_driver = {
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PPS_NAME,
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pps_methods,
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sizeof(struct pps_data),
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};
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DRIVER_MODULE(pps, ppbus, pps_driver, 0, 0);
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MODULE_DEPEND(pps, ppbus, 1, 1, 1);
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