sys/dev/sbus/xbox.c

   1 /*      $NetBSD: xbox.c,v 1.19 2009/05/12 14:43:59 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 1.19 2009/05/12 14:43:59 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(device_t, cfdata_t, void *);
  95 void    xbox_attach(device_t, device_t, 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(device_t parent, cfdata_t 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(device_t parent, device_t self, void *aux)
 124 {
 125         struct xbox_softc *sc = device_private(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(self, (void *)&xa, xbox_print);
 154 }