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Annotation of sys/arch/sparc/dev/bt445.c, Revision 1.1.1.1

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: }