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      1 /*	$NetBSD: bus_dma_stub.c,v 1.1 2026/07/07 15:24:51 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2026 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 /*
     33  * Stub implementation of bus_dma() that does nothing, returns errors.
     34  * This is for platforms that don't support DMA, but where providing
     35  * the symbols is still useful.
     36  */
     37 
     38 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     39 __KERNEL_RCSID(0, "$NetBSD: bus_dma_stub.c,v 1.1 2026/07/07 15:24:51 thorpej Exp $");
     40 
     41 #define _M68K_BUS_DMA_PRIVATE
     42 
     43 #include <sys/param.h>
     44 #include <sys/errno.h>
     45 #include <machine/bus.h>
     46 
     47 void	_bus_dma_nullop(void);
     48 int	_bus_dma_enotsup(void);
     49 int	_bus_dma_neg_one(void);
     50 
     51 void
     52 _bus_dma_nullop(void)
     53 {
     54 	return;
     55 }
     56 
     57 int
     58 _bus_dma_enotsup(void)
     59 {
     60 	return ENOTSUP;
     61 }
     62 
     63 int
     64 _bus_dma_neg_one(void)
     65 {
     66 	return -1;
     67 }
     68 
     69 __strong_alias(_bus_dmamap_create,_bus_dma_enotsup);
     70 __strong_alias(_bus_dmamap_destroy,_bus_dma_nullop);
     71 
     72 __strong_alias(_bus_dmamap_load_direct,_bus_dma_enotsup);
     73 __strong_alias(_bus_dmamap_load_mbuf_direct,_bus_dma_enotsup);
     74 __strong_alias(_bus_dmamap_load_uio_direct,_bus_dma_enotsup);
     75 __strong_alias(_bus_dmamap_load_raw_direct,_bus_dma_enotsup);
     76 __strong_alias(_bus_dmamap_unload,_bus_dma_nullop);
     77 
     78 __strong_alias(_bus_dmamap_sync,_bus_dma_nullop);
     79 
     80 __strong_alias(_bus_dmamem_alloc_common,_bus_dma_enotsup);
     81 __strong_alias(_bus_dmamem_alloc,_bus_dma_enotsup);
     82 __strong_alias(_bus_dmamem_free,_bus_dma_enotsup);
     83 __strong_alias(_bus_dmamem_map,_bus_dma_enotsup);
     84 __strong_alias(_bus_dmamem_unmap,_bus_dma_nullop);
     85 __strong_alias(_bus_dmamem_mmap,_bus_dma_neg_one);
     86