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      1 /*	$NetBSD: dma-mapping.h,v 1.10 2021/12/19 12:21:30 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      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 #ifndef _LINUX_DMA_MAPPING_H_
     33 #define _LINUX_DMA_MAPPING_H_
     34 
     35 #include <sys/param.h>
     36 #include <sys/bus.h>
     37 
     38 #include <machine/limits.h>
     39 
     40 #include <linux/types.h>
     41 
     42 enum dma_data_direction {
     43 	DMA_NONE		= 0,
     44 	DMA_TO_DEVICE		= 1,
     45 	DMA_FROM_DEVICE		= 2,
     46 	DMA_BIDIRECTIONAL	= 3,
     47 
     48 	PCI_DMA_NONE		= DMA_NONE,
     49 	PCI_TO_DEVICE		= DMA_TO_DEVICE,
     50 	PCI_FROM_DEVICE		= DMA_FROM_DEVICE,
     51 	PCI_DMA_BIDIRECTIONAL	= DMA_BIDIRECTIONAL,
     52 };
     53 
     54 enum {
     55 	DMA_ATTR_NO_WARN	= __BIT(0),
     56 	DMA_ATTR_SKIP_CPU_SYNC	= __BIT(1),
     57 };
     58 
     59 static inline uintmax_t
     60 DMA_BIT_MASK(unsigned nbits)
     61 {
     62 
     63 	if (nbits == CHAR_BIT*sizeof(uintmax_t))
     64 		return ~(uintmax_t)0;
     65 	return ~(~(uintmax_t)0 << nbits);
     66 }
     67 
     68 static inline bool
     69 dma_addressing_limited(device_t dev)
     70 {
     71 
     72 	return false;
     73 }
     74 
     75 #endif  /* _LINUX_DMA_MAPPING_H_ */
     76