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      1 /*	$NetBSD: mainbus.c,v 1.9 2025/10/19 20:52:09 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tim Rightnour
      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 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: mainbus.c,v 1.9 2025/10/19 20:52:09 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/extent.h>
     37 #include <sys/systm.h>
     38 #include <sys/device.h>
     39 #include <sys/bus.h>
     40 
     41 #include <machine/autoconf.h>
     42 #include <powerpc/pio.h>
     43 
     44 #include "mca.h"
     45 
     46 #if NMCA > 0
     47 #include <dev/mca/mcavar.h>
     48 #endif
     49 
     50 int	mainbus_match(device_t, cfdata_t, void *);
     51 void	mainbus_attach(device_t, device_t, void *);
     52 
     53 CFATTACH_DECL_NEW(mainbus, 0,
     54     mainbus_match, mainbus_attach, NULL, NULL);
     55 
     56 int	mainbus_print(void *, const char *);
     57 
     58 union mainbus_attach_args {
     59 	const char *mba_busname;		/* first elem of all */
     60 #if NMCA > 0
     61 	struct mcabus_attach_args mba_mba;
     62 #endif
     63 };
     64 
     65 /* There can be only one. */
     66 int mainbus_found = 0;
     67 
     68 /*
     69  * Probe for the mainbus; always succeeds.
     70  */
     71 int
     72 mainbus_match(device_t parent, cfdata_t match, void *aux)
     73 {
     74 
     75 	if (mainbus_found)
     76 		return 0;
     77 	return 1;
     78 }
     79 
     80 /*
     81  * Attach the mainbus.
     82  */
     83 void
     84 mainbus_attach(device_t parent, device_t self, void *aux)
     85 {
     86 	union mainbus_attach_args mba;
     87 	struct confargs ca;
     88 #if DEBUG
     89 	int slot;
     90 #endif
     91 	mainbus_found = 1;
     92 
     93 	aprint_normal("\n");
     94 
     95 	ca.ca_name = "cpu";
     96 	ca.ca_node = 0;
     97 	config_found(self, &ca, mainbus_print,
     98 	    CFARGS(.iattr = "mainbus"));
     99 
    100 #if DEBUG
    101 	printf("scanning MCA bus\n");
    102 	for (slot=0; slot < 16; slot++) {
    103 		printf("slot %d == %x%x\n", slot,
    104 		    inb(0xc0400100 + 1 + (slot<<16)),
    105 		    inb(0xc0400100 + 0 + (slot<<16)));
    106 	}
    107 	printf("done\n");
    108 
    109 	printf(" CFG reg (1)= %x\n", inl(0xc0010080));
    110 	printf(" TCE reg (1)= %x\n", inl(0xc001009c));
    111 #endif
    112 
    113 	mba.mba_mba.mba_iot = &rs6000_iocc0_io_space_tag;
    114 	mba.mba_mba.mba_memt = &rs6000_iocc0_io_space_tag; /* XXX ??? */
    115 	mba.mba_mba.mba_dmat = NULL; /*&mca_bus_dma_tag;*/
    116 	mba.mba_mba.mba_mc = NULL;
    117 	mba.mba_mba.mba_bus = 0;
    118 	mcabus_attach(self, &mba.mba_mba);
    119 }
    120 
    121 int
    122 mainbus_print(void *aux, const char *pnp)
    123 {
    124 	union mainbus_attach_args *mba = aux;
    125 
    126 	if (pnp)
    127 		aprint_normal("%s at %s", mba->mba_busname, pnp);
    128 
    129 	return (UNCONF);
    130 }
    131