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Annotation of sys/arch/sparc64/dev/pmc.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: pmc.c,v 1.1 2007/04/10 19:03:10 kettenis Exp $        */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2007 Mark Kettenis
        !             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: /*
        !            20:  * Driver for watchdog device on Blade 1000, Fire 280R, Fire V480 etc.
        !            21:  */
        !            22:
        !            23: #include <sys/param.h>
        !            24: #include <sys/kernel.h>
        !            25: #include <sys/device.h>
        !            26: #include <sys/malloc.h>
        !            27: #include <sys/systm.h>
        !            28:
        !            29: #include <machine/bus.h>
        !            30: #include <machine/autoconf.h>
        !            31:
        !            32: #include <sparc64/dev/ebusreg.h>
        !            33: #include <sparc64/dev/ebusvar.h>
        !            34:
        !            35: /*
        !            36:  * Register access is indirect, through an address and data port.
        !            37:  */
        !            38:
        !            39: #define        PMC_ADDR        0
        !            40: #define        PMC_DATA        1
        !            41:
        !            42: /* Watchdog time-out register. */
        !            43: #define PMC_WDTO       0x05
        !            44:
        !            45: struct pmc_softc {
        !            46:        struct device           sc_dv;
        !            47:        bus_space_tag_t         sc_iot;
        !            48:        bus_space_handle_t      sc_ioh;
        !            49: };
        !            50:
        !            51: int    pmc_match(struct device *, void *, void *);
        !            52: void   pmc_attach(struct device *, struct device *, void *);
        !            53: int    pmc_wdog_cb(void *, int);
        !            54:
        !            55: struct cfattach pmc_ca = {
        !            56:        sizeof(struct pmc_softc), pmc_match, pmc_attach
        !            57: };
        !            58:
        !            59: struct cfdriver pmc_cd = {
        !            60:        NULL, "pmc", DV_DULL
        !            61: };
        !            62:
        !            63: int
        !            64: pmc_match(struct device *parent, void *cf, void *aux)
        !            65: {
        !            66:        struct ebus_attach_args *ea = aux;
        !            67:
        !            68:        if (strcmp("pmc", ea->ea_name) == 0)
        !            69:                return (1);
        !            70:        return (0);
        !            71: }
        !            72:
        !            73: void
        !            74: pmc_attach(struct device *parent, struct device *self, void *aux)
        !            75: {
        !            76:        struct pmc_softc *sc = (void *)self;
        !            77:        struct ebus_attach_args *ea = aux;
        !            78:
        !            79:        /* Use prom address if available, otherwise map it. */
        !            80:        if (ea->ea_nvaddrs) {
        !            81:                if (bus_space_map(ea->ea_memtag, ea->ea_vaddrs[0], 0,
        !            82:                    BUS_SPACE_MAP_PROMADDRESS, &sc->sc_ioh)) {
        !            83:                        printf(": can't map PROM register space\n");
        !            84:                        return;
        !            85:                }
        !            86:                sc->sc_iot = ea->ea_memtag;
        !            87:        } else if (ebus_bus_map(ea->ea_iotag, 0,
        !            88:            EBUS_PADDR_FROM_REG(&ea->ea_regs[0]),
        !            89:            ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) {
        !            90:                sc->sc_iot = ea->ea_iotag;
        !            91:        } else if (ebus_bus_map(ea->ea_memtag, 0,
        !            92:            EBUS_PADDR_FROM_REG(&ea->ea_regs[0]),
        !            93:            ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) {
        !            94:                sc->sc_iot = ea->ea_memtag;
        !            95:        } else {
        !            96:                printf("%s: can't map register space\n", self->dv_xname);
        !            97:                return;
        !            98:        }
        !            99:
        !           100:        printf("\n");
        !           101:
        !           102:        wdog_register(sc, pmc_wdog_cb);
        !           103: }
        !           104:
        !           105: int
        !           106: pmc_wdog_cb(void *arg, int period)
        !           107: {
        !           108:        struct pmc_softc *sc = arg;
        !           109:        int mins;
        !           110:
        !           111:        mins = (period + 59) / 60;
        !           112:        if (mins > 255)
        !           113:                mins = 255;
        !           114:
        !           115:        bus_space_write_1(sc->sc_iot, sc->sc_ioh, PMC_ADDR, PMC_WDTO);
        !           116:        bus_space_write_1(sc->sc_iot, sc->sc_ioh, PMC_DATA, mins);
        !           117:
        !           118:        return (mins * 60);
        !           119: }