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dma-mapping.h revision 1.8 
      1  1.8  riastrad /*	$NetBSD: dma-mapping.h,v 1.8 2021/12/19 09:57:01 riastradh Exp $	*/
      2  1.2  riastrad 
      3  1.2  riastrad /*-
      4  1.2  riastrad  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  1.2  riastrad  * All rights reserved.
      6  1.2  riastrad  *
      7  1.2  riastrad  * This code is derived from software contributed to The NetBSD Foundation
      8  1.2  riastrad  * by Taylor R. Campbell.
      9  1.2  riastrad  *
     10  1.2  riastrad  * Redistribution and use in source and binary forms, with or without
     11  1.2  riastrad  * modification, are permitted provided that the following conditions
     12  1.2  riastrad  * are met:
     13  1.2  riastrad  * 1. Redistributions of source code must retain the above copyright
     14  1.2  riastrad  *    notice, this list of conditions and the following disclaimer.
     15  1.2  riastrad  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.2  riastrad  *    notice, this list of conditions and the following disclaimer in the
     17  1.2  riastrad  *    documentation and/or other materials provided with the distribution.
     18  1.2  riastrad  *
     19  1.2  riastrad  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.2  riastrad  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.2  riastrad  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.2  riastrad  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.2  riastrad  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.2  riastrad  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.2  riastrad  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.2  riastrad  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.2  riastrad  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.2  riastrad  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.2  riastrad  * POSSIBILITY OF SUCH DAMAGE.
     30  1.2  riastrad  */
     31  1.2  riastrad 
     32  1.2  riastrad #ifndef _LINUX_DMA_MAPPING_H_
     33  1.2  riastrad #define _LINUX_DMA_MAPPING_H_
     34  1.2  riastrad 
     35  1.8  riastrad #include <sys/param.h>
     36  1.2  riastrad #include <sys/bus.h>
     37  1.2  riastrad 
     38  1.6  riastrad #include <machine/limits.h>
     39  1.6  riastrad 
     40  1.7  riastrad #include <linux/types.h>
     41  1.2  riastrad 
     42  1.3  riastrad static inline uintmax_t
     43  1.3  riastrad DMA_BIT_MASK(unsigned nbits)
     44  1.3  riastrad {
     45  1.3  riastrad 
     46  1.6  riastrad 	if (nbits == CHAR_BIT*sizeof(uintmax_t))
     47  1.6  riastrad 		return ~(uintmax_t)0;
     48  1.3  riastrad 	return ~(~(uintmax_t)0 << nbits);
     49  1.3  riastrad }
     50  1.3  riastrad 
     51  1.8  riastrad static inline bool
     52  1.8  riastrad dma_addressing_limited(device_t *dev)
     53  1.8  riastrad {
     54  1.8  riastrad 
     55  1.8  riastrad 	return false;
     56  1.8  riastrad }
     57  1.8  riastrad 
     58  1.2  riastrad #endif  /* _LINUX_DMA_MAPPING_H_ */
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