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      1 /*	$NetBSD: mainbus.c,v 1.15 2023/02/04 14:38:09 tsutsui Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      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 1.15 2023/02/04 14:38:09 tsutsui Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/device.h>
     37 #include <sys/systm.h>
     38 
     39 #define _M68K_BUS_DMA_PRIVATE
     40 #include <machine/autoconf.h>
     41 
     42 static int	mainbus_match(device_t, cfdata_t, void *);
     43 static void	mainbus_attach(device_t, device_t, void *);
     44 static int	mainbus_search(device_t, cfdata_t,
     45 			       const int *, void *);
     46 
     47 CFATTACH_DECL_NEW(mainbus, 0,
     48     mainbus_match, mainbus_attach, NULL, NULL);
     49 
     50 struct m68k_bus_dma_tag next68k_bus_dma_tag = {
     51 	NULL,					/* _cookie */
     52 
     53 	0,					/* _boundary */
     54 
     55 	_bus_dmamap_create,			/* _dmamap_create */
     56 	_bus_dmamap_destroy,			/* _dmamap_destroy */
     57 	_bus_dmamap_load_direct,		/* _dmamap_load */
     58 	_bus_dmamap_load_mbuf_direct,		/* _dmamap_load_mbuf */
     59 	_bus_dmamap_load_uio_direct,		/* _dmamap_load_uio */
     60 	_bus_dmamap_load_raw_direct,		/* _dmamap_load_raw */
     61 	_bus_dmamap_unload,			/* _dmamap_unload */
     62 	_bus_dmamap_sync,			/* _dmamap_sync */
     63 
     64 	_bus_dmamem_alloc,			/* _dmamem_alloc */
     65 	_bus_dmamem_free,			/* _dmamem_free */
     66 	_bus_dmamem_map,			/* _dmamem_map */
     67 	_bus_dmamem_unmap,			/* _dmamem_unmap */
     68 	_bus_dmamem_mmap			/* _dmamem_mmap */
     69 };
     70 
     71 static int mainbus_attached = 0;
     72 
     73 static int
     74 mainbus_match(device_t parent, cfdata_t cf, void *aux)
     75 {
     76 
     77 	/* Allow only one instance. */
     78 	if (mainbus_attached)
     79 		return 0;
     80 
     81 	return 1;
     82 }
     83 
     84 static void
     85 mainbus_attach(device_t parent, device_t self, void *aux)
     86 {
     87 	struct mainbus_attach_args mba;
     88 
     89 	printf("\n");
     90 
     91 	mba.mba_dmat = &next68k_bus_dma_tag;
     92 
     93 	/* Search for and attach children. */
     94 	config_search(self, &mba,
     95 	    CFARGS(.search = mainbus_search));
     96 
     97 	mainbus_attached = 1;
     98 }
     99 
    100 static int
    101 mainbus_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
    102 {
    103 
    104 	if (config_probe(parent, cf, aux))
    105 		config_attach(parent, cf, aux, NULL, CFARGS_NONE);
    106 	return 0;
    107 }
    108