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/* $OpenBSD: bt445.c,v 1.2 2008/12/26 15:33:40 miod Exp $ */
/*
* Copyright (c) 2003, Miodrag Vallat.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* A skeleton driver for the Brooktree BT445 ``Chameleon'' RAMDAC found
* on the early Tadpole SPARCbook 3 machines.
*
* It will not perform anything by itself, but frame buffer drivers can use
* its softc structure to be able to access the RAMDAC themselves - creating
* a ramdac API for just this specific case of separate attachments is not
* worth doing.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <machine/autoconf.h>
#include <sparc/dev/bt445reg.h>
#include <sparc/dev/bt445var.h>
void btcham_attach(struct device *, struct device *, void *);
int btcham_match(struct device *, void *, void *);
struct cfattach btcham_ca = {
sizeof(struct bt445_softc), btcham_match, btcham_attach
};
struct cfdriver btcham_cd = {
NULL, "btcham", DV_DULL
};
/*
* Match a chameleon
*/
int
btcham_match(struct device *parent, void *vcf, void *aux)
{
struct confargs *ca = aux;
struct romaux *ra = &ca->ca_ra;
if (strcmp("bt445", ra->ra_name) != 0)
return (0);
return (1);
}
/*
* Attach a chameleon
*/
void
btcham_attach(struct device *parent, struct device *self, void *args)
{
struct confargs *ca = args;
struct bt445_softc *sc = (struct bt445_softc *)self;
int id, rev;
/*
* Map the registers
*/
sc->sc_regs = mapiodev(ca->ca_ra.ra_reg, 0, ca->ca_ra.ra_len);
/*
* Report a few values to please the user.
*/
sc->sc_regs[BT445_ADDRESS] = BT445_REGISTER_OFFSET(BT445_ID);
id = sc->sc_regs[BT445_REGISTER_INDEX(BT445_ID)];
sc->sc_regs[BT445_ADDRESS] = BT445_REGISTER_OFFSET(BT445_REVISION);
rev = sc->sc_regs[BT445_REGISTER_INDEX(BT445_REVISION)];
printf(": id 0x%x, revision 0x%x\n", id, rev);
}
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