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xbox.c revision 1.17 
      1 /*	$NetBSD: xbox.c,v 1.17 2009/03/18 16:00:20 cegger Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Paul Kranenburg.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Sbus expansion box.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: xbox.c,v 1.17 2009/03/18 16:00:20 cegger Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/malloc.h>
     41 #include <sys/systm.h>
     42 #include <sys/device.h>
     43 
     44 #include <sys/bus.h>
     45 #include <dev/sbus/sbusvar.h>
     46 #include <dev/sbus/xboxvar.h>
     47 #include <machine/autoconf.h>
     48 
     49 /*
     50  * Xbox registers definitions.
     51  *
     52  * The xbox device can operate in two mode: "opaque" and "transparent".
     53  * In opaque mode, all accesses to the xbox address space are directed
     54  * to the xbox itself. In transparent mode, all accesses are mapped to
     55  * the SBus cards in the expansion box.
     56  *
     57  * To access the xbox registers in transparent mode, you must write
     58  * to the "write0" register. The layout of this register appears to
     59  * be as follows:
     60  *
     61  *	bit 31-24: xbox key (identifies device when you cascade them)
     62  *	bit 23-12: offset of register to access
     63  *	bit 11-0:  value to write
     64  *
     65  * For instance, to switch to opaque mode:
     66  *	(*sc->write0_reg) = (sc->sc_key << 24) | XAC_CTL1_OFFSET;
     67  *
     68  * (note we're not currently using any of this)
     69  */
     70 #define WRITE0_OFFSET		0
     71 
     72 #define XAC_ERR_OFFSET		0x2000
     73 #define XAC_CTL0_OFFSET		0x10000
     74 #define XAC_CTL1_OFFSET		0x11000
     75 #define XAC_ELUA_OFFSET		0x12000
     76 #define XAC_ELLA_OFFSET		0x13000
     77 #define XAC_ELE_OFFSET		0x14000
     78 
     79 #define XBC_ERR_OFFSET		0x42000
     80 #define XBC_CTL0_OFFSET		0x50000
     81 #define XBC_CTL1_OFFSET		0x51000
     82 #define XBC_ELUA_OFFSET		0x52000
     83 #define XBC_ELLA_OFFSET		0x53000
     84 #define XBC_ELE_OFFSET		0x54000
     85 
     86 #define XBOX_NREG		13
     87 
     88 struct xbox_softc {
     89 	struct device	sc_dev;		/* base device */
     90 	int		sc_key;		/* this xbox's unique key */
     91 };
     92 
     93 /* autoconfiguration driver */
     94 int	xbox_match(struct device *, struct cfdata *, void *);
     95 void	xbox_attach(struct device *, struct device *, void *);
     96 int	xbox_print( void *, const char *);
     97 
     98 CFATTACH_DECL(xbox, sizeof(struct xbox_softc),
     99     xbox_match, xbox_attach, NULL, NULL);
    100 
    101 int
    102 xbox_print(void *args, const char *busname)
    103 {
    104 	struct xbox_attach_args *xa = args;
    105 
    106 	if (busname)
    107 		aprint_normal("%s at %s", xa->xa_name, busname);
    108 	return (UNCONF);
    109 }
    110 
    111 int
    112 xbox_match(struct device *parent, struct cfdata *cf, void *aux)
    113 {
    114 	struct sbus_attach_args *sa = aux;
    115 
    116 	return (strcmp("SUNW,xbox", sa->sa_name) == 0);
    117 }
    118 
    119 /*
    120  * Attach an Xbox.
    121  */
    122 void
    123 xbox_attach(struct device *parent, struct device *self, void *aux)
    124 {
    125 	struct xbox_softc *sc = (struct xbox_softc *)self;
    126 	struct sbus_attach_args *sa = aux;
    127 	int node = sa->sa_node;
    128 	struct xbox_attach_args xa;
    129 	char *cp;
    130 
    131 	sc->sc_key = prom_getpropint(node, "write0-key", -1);
    132 
    133 	cp = prom_getpropstring(node, "model");
    134 	printf(": model %s", cp);
    135 
    136 	cp = prom_getpropstring(node, "child-present");
    137 	if (strcmp(cp, "true") != 0) {
    138 		printf(": no sbus devices\n");
    139 		return;
    140 	}
    141 
    142 	printf("\n");
    143 
    144 	/*
    145 	 * Now pretend to be another Sbus.
    146 	 */
    147 	memset(&xa, 0, sizeof xa);
    148 	xa.xa_name = "sbus";
    149 	xa.xa_node = node;
    150 	xa.xa_bustag = sa->sa_bustag;
    151 	xa.xa_dmatag = sa->sa_dmatag;
    152 
    153 	(void) config_found(&sc->sc_dev, (void *)&xa, xbox_print);
    154 }
    155