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Annotation of sys/arch/sparc/dev/bt445.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: bt445.c,v 1.1 2003/06/17 21:21:31 miod Exp $  */
        !             2: /*
        !             3:  * Copyright (c) 2003, Miodrag Vallat.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  *
        !            14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            15:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            16:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
        !            17:  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
        !            18:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        !            19:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            20:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            21:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
        !            22:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
        !            23:  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            24:  * POSSIBILITY OF SUCH DAMAGE.
        !            25:  */
        !            26:
        !            27: /*
        !            28:  * A skeleton driver for the Brooktree BT445 ``Chameleon'' RAMDAC found
        !            29:  * on the early Tadpole SPARCbook 3 machines.
        !            30:  *
        !            31:  * It will not perform anything by itself, but frame buffer drivers can use
        !            32:  * its softc structure to be able to access the RAMDAC themselves - creating
        !            33:  * a ramdac API for just this specific case of separate attachments is not
        !            34:  * worth doing.
        !            35:  */
        !            36:
        !            37: #include <sys/param.h>
        !            38: #include <sys/systm.h>
        !            39: #include <sys/device.h>
        !            40: #include <sys/conf.h>
        !            41:
        !            42: #include <machine/autoconf.h>
        !            43:
        !            44: #include <sparc/dev/bt445reg.h>
        !            45: #include <sparc/dev/bt445var.h>
        !            46:
        !            47: void   btcham_attach(struct device *, struct device *, void *);
        !            48: int    btcham_match(struct device *, void *, void *);
        !            49:
        !            50: struct cfattach btcham_ca = {
        !            51:        sizeof(struct bt445_softc), btcham_match, btcham_attach
        !            52: };
        !            53:
        !            54: struct cfdriver btcham_cd = {
        !            55:        NULL, "btcham", DV_DULL
        !            56: };
        !            57:
        !            58: /*
        !            59:  * Match a chameleon
        !            60:  */
        !            61: int
        !            62: btcham_match(struct device *parent, void *vcf, void *aux)
        !            63: {
        !            64:        struct confargs *ca = aux;
        !            65:        struct romaux *ra = &ca->ca_ra;
        !            66:
        !            67:        if (strcmp("bt445", ra->ra_name) != 0)
        !            68:                return (0);
        !            69:
        !            70:        return (1);
        !            71: }
        !            72:
        !            73: /*
        !            74:  * Attach a chameleon
        !            75:  */
        !            76: void
        !            77: btcham_attach(struct device *parent, struct device *self, void *args)
        !            78: {
        !            79:        struct confargs *ca = args;
        !            80:        struct bt445_softc *sc = (struct bt445_softc *)self;
        !            81:        int id, rev;
        !            82:
        !            83:        /*
        !            84:         * Map the registers
        !            85:         */
        !            86:        sc->sc_regs = mapiodev(ca->ca_ra.ra_reg, 0, ca->ca_ra.ra_len);
        !            87:
        !            88:        /*
        !            89:         * Report a few values to please the user.
        !            90:         */
        !            91:        sc->sc_regs[BT445_ADDRESS] = BT445_REGISTER_OFFSET(BT445_ID);
        !            92:        id = sc->sc_regs[BT445_REGISTER_INDEX(BT445_ID)];
        !            93:
        !            94:        sc->sc_regs[BT445_ADDRESS] = BT445_REGISTER_OFFSET(BT445_ID);
        !            95:        rev = sc->sc_regs[BT445_REGISTER_INDEX(BT445_ID)];
        !            96:
        !            97:        printf(": id 0x%x, revision 0x%x\n", id, rev);
        !            98: }