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Annotation of sys/dev/pci/pwdog.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: pwdog.c,v 1.6 2006/12/17 15:56:23 mbalmer Exp $ */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2006 Marc Balmer <mbalmer@openbsd.org>
        !             5:  *
        !             6:  * Permission to use, copy, modify, and distribute this software for any
        !             7:  * purpose with or without fee is hereby granted, provided that the above
        !             8:  * copyright notice and this permission notice appear in all copies.
        !             9:  *
        !            10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !            11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            14:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            15:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            16:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            17:  */
        !            18:
        !            19: #include <sys/types.h>
        !            20: #include <sys/param.h>
        !            21: #include <sys/device.h>
        !            22: #include <sys/kernel.h>
        !            23: #include <sys/proc.h>
        !            24: #include <sys/systm.h>
        !            25:
        !            26: #include <machine/bus.h>
        !            27:
        !            28: #include <dev/pci/pcivar.h>
        !            29: #include <dev/pci/pcireg.h>
        !            30: #include <dev/pci/pcidevs.h>
        !            31:
        !            32: struct pwdog_softc {
        !            33:        struct device           pwdog_dev;
        !            34:        bus_space_tag_t         iot;
        !            35:        bus_space_handle_t      ioh;
        !            36: };
        !            37:
        !            38: /* registers */
        !            39: #define PWDOG_ACTIVATE 0
        !            40: #define PWDOG_DISABLE  1
        !            41:
        !            42: int pwdog_probe(struct device *, void *, void *);
        !            43: void pwdog_attach(struct device *, struct device *, void *);
        !            44: int pwdog_set_timeout(void *, int);
        !            45:
        !            46: struct cfattach pwdog_ca = {
        !            47:        sizeof(struct pwdog_softc), pwdog_probe, pwdog_attach
        !            48: };
        !            49:
        !            50: struct cfdriver pwdog_cd = {
        !            51:        NULL, "pwdog", DV_DULL
        !            52: };
        !            53:
        !            54: const struct pci_matchid pwdog_devices[] = {
        !            55:        { PCI_VENDOR_QUANCOM, PCI_PRODUCT_QUANCOM_PWDOG1 }
        !            56: };
        !            57:
        !            58: int
        !            59: pwdog_probe(struct device *parent, void *match, void *aux)
        !            60: {
        !            61:        return pci_matchbyid((struct pci_attach_args *)aux, pwdog_devices,
        !            62:            sizeof(pwdog_devices) / sizeof(pwdog_devices[0]));
        !            63: }
        !            64:
        !            65: void
        !            66: pwdog_attach(struct device *parent, struct device *self, void *aux)
        !            67: {
        !            68:        struct pwdog_softc *pwdog = (struct pwdog_softc *)self;
        !            69:        struct pci_attach_args *const pa = (struct pci_attach_args *)aux;
        !            70:        pcireg_t memtype;
        !            71:        bus_size_t iosize;
        !            72:
        !            73:        memtype = pci_mapreg_type(pa->pa_pc, pa->pa_tag, PCI_MAPREG_START);
        !            74:        if (pci_mapreg_map(pa, PCI_MAPREG_START, memtype, 0, &pwdog->iot,
        !            75:            &pwdog->ioh, NULL, &iosize, 0)) {
        !            76:                printf("\n%s: PCI %s region not found\n",
        !            77:                    pwdog->pwdog_dev.dv_xname,
        !            78:                    memtype == PCI_MAPREG_TYPE_IO ? "I/O" : "memory");
        !            79:                return;
        !            80:        }
        !            81:        printf("\n");
        !            82:        bus_space_write_1(pwdog->iot, pwdog->ioh, PWDOG_DISABLE, 0);
        !            83:        wdog_register(pwdog, pwdog_set_timeout);
        !            84: }
        !            85:
        !            86: int
        !            87: pwdog_set_timeout(void *self, int seconds)
        !            88: {
        !            89:        struct pwdog_softc *pwdog = (struct pwdog_softc *)self;
        !            90:        int s;
        !            91:
        !            92:        s = splclock();
        !            93:        if (seconds)
        !            94:                bus_space_write_1(pwdog->iot, pwdog->ioh, PWDOG_ACTIVATE, 0);
        !            95:        else
        !            96:                bus_space_write_1(pwdog->iot, pwdog->ioh, PWDOG_DISABLE, 0);
        !            97:        splx(s);
        !            98:        return seconds;
        !            99: }