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 42enum 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 54enum { 55 DMA_ATTR_NO_WARN = __BIT(0), 56 DMA_ATTR_SKIP_CPU_SYNC = __BIT(1), 57}; 58 59static inline uintmax_t 60DMA_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 68static inline bool 69dma_addressing_limited(device_t dev) 70{ 71 72 return false; 73} 74 75#endif /* _LINUX_DMA_MAPPING_H_ */ 76