163 lines
4.5 KiB
C
163 lines
4.5 KiB
C
/* $NetBSD: xbox.c,v 1.15 2008/04/28 20:23:57 martin Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Paul Kranenburg.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Sbus expansion box.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: xbox.c,v 1.15 2008/04/28 20:23:57 martin Exp $");
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/bus.h>
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#include <dev/sbus/sbusvar.h>
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#include <dev/sbus/xboxvar.h>
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#include <machine/autoconf.h>
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/*
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* Xbox registers definitions.
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*
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* The xbox device can operate in two mode: "opaque" and "transparent".
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* In opaque mode, all accesses to the xbox address space are directed
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* to the xbox itself. In transparent mode, all accesses are mapped to
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* the SBus cards in the expansion box.
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*
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* To access the xbox registers in transparent mode, you must write
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* to the "write0" register. The layout of this register appears to
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* be as follows:
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*
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* bit 31-24: xbox key (identifies device when you cascade them)
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* bit 23-12: offset of register to access
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* bit 11-0: value to write
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*
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* For instance, to switch to opaque mode:
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* (*sc->write0_reg) = (sc->sc_key << 24) | XAC_CTL1_OFFSET;
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*
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* (note we're not currently using any of this)
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*/
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#define WRITE0_OFFSET 0
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#define XAC_ERR_OFFSET 0x2000
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#define XAC_CTL0_OFFSET 0x10000
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#define XAC_CTL1_OFFSET 0x11000
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#define XAC_ELUA_OFFSET 0x12000
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#define XAC_ELLA_OFFSET 0x13000
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#define XAC_ELE_OFFSET 0x14000
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#define XBC_ERR_OFFSET 0x42000
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#define XBC_CTL0_OFFSET 0x50000
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#define XBC_CTL1_OFFSET 0x51000
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#define XBC_ELUA_OFFSET 0x52000
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#define XBC_ELLA_OFFSET 0x53000
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#define XBC_ELE_OFFSET 0x54000
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#define XBOX_NREG 13
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struct xbox_softc {
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struct device sc_dev; /* base device */
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int sc_key; /* this xbox's unique key */
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};
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/* autoconfiguration driver */
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int xbox_match(struct device *, struct cfdata *, void *);
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void xbox_attach(struct device *, struct device *, void *);
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int xbox_print( void *, const char *);
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CFATTACH_DECL(xbox, sizeof(struct xbox_softc),
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xbox_match, xbox_attach, NULL, NULL);
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int
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xbox_print(args, busname)
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void *args;
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const char *busname;
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{
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struct xbox_attach_args *xa = args;
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if (busname)
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aprint_normal("%s at %s", xa->xa_name, busname);
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return (UNCONF);
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}
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int
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xbox_match(parent, cf, aux)
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struct device *parent;
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struct cfdata *cf;
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void *aux;
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{
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struct sbus_attach_args *sa = aux;
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return (strcmp("SUNW,xbox", sa->sa_name) == 0);
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}
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/*
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* Attach an Xbox.
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*/
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void
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xbox_attach(parent, self, aux)
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struct device *parent;
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struct device *self;
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void *aux;
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{
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struct xbox_softc *sc = (struct xbox_softc *)self;
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struct sbus_attach_args *sa = aux;
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int node = sa->sa_node;
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struct xbox_attach_args xa;
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char *cp;
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sc->sc_key = prom_getpropint(node, "write0-key", -1);
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cp = prom_getpropstring(node, "model");
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printf(": model %s", cp);
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cp = prom_getpropstring(node, "child-present");
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if (strcmp(cp, "true") != 0) {
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printf(": no sbus devices\n");
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return;
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}
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printf("\n");
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/*
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* Now pretend to be another Sbus.
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*/
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bzero(&xa, sizeof xa);
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xa.xa_name = "sbus";
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xa.xa_node = node;
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xa.xa_bustag = sa->sa_bustag;
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xa.xa_dmatag = sa->sa_dmatag;
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(void) config_found(&sc->sc_dev, (void *)&xa, xbox_print);
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}
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