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      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