1 /* $NetBSD: xbox.c,v 1.6 2001/11/13 06:58:18 lukem 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Sbus expansion box. 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: xbox.c,v 1.6 2001/11/13 06:58:18 lukem Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/malloc.h> 48 #include <sys/systm.h> 49 #include <sys/device.h> 50 51 #include <machine/bus.h> 52 #include <dev/sbus/sbusvar.h> 53 #include <dev/sbus/xboxvar.h> 54 #include <machine/autoconf.h> 55 56 /* 57 * Xbox registers definitions. 58 * 59 * The xbox device can operate in two mode: "opaque" and "transparent". 60 * In opaque mode, all accesses to the xbox address space are directed 61 * to the xbox itself. In transparent mode, all accesses are mapped to 62 * the SBus cards in the expansion box. 63 * 64 * To access the xbox registers in transparent mode, you must write 65 * to the "write0" register. The layout of this register appears to 66 * be as follows: 67 * 68 * bit 31-24: xbox key (identifies device when you cascade them) 69 * bit 23-12: offset of register to access 70 * bit 11-0: value to write 71 * 72 * For instance, to switch to opaque mode: 73 * (*sc->write0_reg) = (sc->sc_key << 24) | XAC_CTL1_OFFSET; 74 * 75 * (note we're not currently using any of this) 76 */ 77 #define WRITE0_OFFSET 0 78 79 #define XAC_ERR_OFFSET 0x2000 80 #define XAC_CTL0_OFFSET 0x10000 81 #define XAC_CTL1_OFFSET 0x11000 82 #define XAC_ELUA_OFFSET 0x12000 83 #define XAC_ELLA_OFFSET 0x13000 84 #define XAC_ELE_OFFSET 0x14000 85 86 #define XBC_ERR_OFFSET 0x42000 87 #define XBC_CTL0_OFFSET 0x50000 88 #define XBC_CTL1_OFFSET 0x51000 89 #define XBC_ELUA_OFFSET 0x52000 90 #define XBC_ELLA_OFFSET 0x53000 91 #define XBC_ELE_OFFSET 0x54000 92 93 #define XBOX_NREG 13 94 95 struct xbox_softc { 96 struct device sc_dev; /* base device */ 97 int sc_key; /* this xbox's unique key */ 98 }; 99 100 /* autoconfiguration driver */ 101 int xbox_match __P((struct device *, struct cfdata *, void *)); 102 void xbox_attach __P((struct device *, struct device *, void *)); 103 int xbox_print __P(( void *, const char *)); 104 105 struct cfattach xbox_ca = { 106 sizeof(struct xbox_softc), xbox_match, xbox_attach 107 }; 108 109 int 110 xbox_print(args, busname) 111 void *args; 112 const char *busname; 113 { 114 struct xbox_attach_args *xa = args; 115 116 if (busname) 117 printf("%s at %s", xa->xa_name, busname); 118 return (UNCONF); 119 } 120 121 int 122 xbox_match(parent, cf, aux) 123 struct device *parent; 124 struct cfdata *cf; 125 void *aux; 126 { 127 struct sbus_attach_args *sa = aux; 128 129 return (strcmp("SUNW,xbox", sa->sa_name) == 0); 130 } 131 132 /* 133 * Attach an Xbox. 134 */ 135 void 136 xbox_attach(parent, self, aux) 137 struct device *parent; 138 struct device *self; 139 void *aux; 140 { 141 struct xbox_softc *sc = (struct xbox_softc *)self; 142 struct sbus_attach_args *sa = aux; 143 int node = sa->sa_node; 144 struct xbox_attach_args xa; 145 char *cp; 146 147 sc->sc_key = PROM_getpropint(node, "write0-key", -1); 148 149 cp = PROM_getpropstring(node, "model"); 150 printf(": model %s", cp); 151 152 cp = PROM_getpropstring(node, "child-present"); 153 if (strcmp(cp, "true") != 0) { 154 printf(": no sbus devices\n"); 155 return; 156 } 157 158 printf("\n"); 159 160 /* 161 * Now pretend to be another Sbus. 162 */ 163 bzero(&xa, sizeof xa); 164 xa.xa_name = "sbus"; 165 xa.xa_node = node; 166 xa.xa_bustag = sa->sa_bustag; 167 xa.xa_dmatag = sa->sa_dmatag; 168 169 (void) config_found(&sc->sc_dev, (void *)&xa, xbox_print); 170 } 171