1 /* $NetBSD: xbox.c,v 1.26 2022/09/25 18:03:04 thorpej 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 1.26 2022/09/25 18:03:04 thorpej Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/device.h> 42 43 #include <sys/bus.h> 44 #include <dev/sbus/sbusvar.h> 45 #include <dev/sbus/xboxvar.h> 46 #include <machine/autoconf.h> 47 48 /* 49 * Xbox registers definitions. 50 * 51 * The xbox device can operate in two mode: "opaque" and "transparent". 52 * In opaque mode, all accesses to the xbox address space are directed 53 * to the xbox itself. In transparent mode, all accesses are mapped to 54 * the SBus cards in the expansion box. 55 * 56 * To access the xbox registers in transparent mode, you must write 57 * to the "write0" register. The layout of this register appears to 58 * be as follows: 59 * 60 * bit 31-24: xbox key (identifies device when you cascade them) 61 * bit 23-12: offset of register to access 62 * bit 11-0: value to write 63 * 64 * For instance, to switch to opaque mode: 65 * (*sc->write0_reg) = (sc->sc_key << 24) | XAC_CTL1_OFFSET; 66 * 67 * (note we're not currently using any of this) 68 */ 69 #define WRITE0_OFFSET 0 70 71 #define XAC_ERR_OFFSET 0x2000 72 #define XAC_CTL0_OFFSET 0x10000 73 #define XAC_CTL1_OFFSET 0x11000 74 #define XAC_ELUA_OFFSET 0x12000 75 #define XAC_ELLA_OFFSET 0x13000 76 #define XAC_ELE_OFFSET 0x14000 77 78 #define XBC_ERR_OFFSET 0x42000 79 #define XBC_CTL0_OFFSET 0x50000 80 #define XBC_CTL1_OFFSET 0x51000 81 #define XBC_ELUA_OFFSET 0x52000 82 #define XBC_ELLA_OFFSET 0x53000 83 #define XBC_ELE_OFFSET 0x54000 84 85 #define XBOX_NREG 13 86 87 struct xbox_softc { 88 int sc_key; /* this xbox's unique key */ 89 }; 90 91 /* autoconfiguration driver */ 92 int xbox_match(device_t, cfdata_t, void *); 93 void xbox_attach(device_t, device_t, void *); 94 int xbox_print(void *, const char *); 95 96 CFATTACH_DECL_NEW(xbox, sizeof(struct xbox_softc), 97 xbox_match, xbox_attach, NULL, NULL); 98 99 int 100 xbox_print(void *args, const char *busname) 101 { 102 struct xbox_attach_args *xa = args; 103 104 if (busname) 105 aprint_normal("%s at %s", xa->xa_name, busname); 106 return (UNCONF); 107 } 108 109 int 110 xbox_match(device_t parent, cfdata_t cf, void *aux) 111 { 112 struct sbus_attach_args *sa = aux; 113 114 return (strcmp("SUNW,xbox", sa->sa_name) == 0); 115 } 116 117 /* 118 * Attach an Xbox. 119 */ 120 void 121 xbox_attach(device_t parent, device_t self, void *aux) 122 { 123 struct xbox_softc *sc = device_private(self); 124 struct sbus_attach_args *sa = aux; 125 int node = sa->sa_node; 126 struct xbox_attach_args xa; 127 char *cp; 128 129 sc->sc_key = prom_getpropint(node, "write0-key", -1); 130 131 cp = prom_getpropstring(node, "model"); 132 printf(": model %s", cp); 133 134 cp = prom_getpropstring(node, "child-present"); 135 if (strcmp(cp, "true") != 0) { 136 printf(": no sbus devices\n"); 137 return; 138 } 139 140 printf("\n"); 141 142 /* 143 * Now pretend to be another Sbus. 144 */ 145 memset(&xa, 0, sizeof xa); 146 xa.xa_name = "sbus"; 147 xa.xa_node = node; 148 xa.xa_bustag = sa->sa_bustag; 149 xa.xa_dmatag = sa->sa_dmatag; 150 151 (void) config_found(self, (void *)&xa, xbox_print, 152 CFARGS(.devhandle = device_handle(self))); 153 } 154