io-mapping.h revision 1.2.4.2
1 1.2.4.2 rmind /* $NetBSD: io-mapping.h,v 1.2.4.2 2014/05/18 17:46:01 rmind Exp $ */ 2 1.2.4.2 rmind 3 1.2.4.2 rmind /*- 4 1.2.4.2 rmind * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.2.4.2 rmind * All rights reserved. 6 1.2.4.2 rmind * 7 1.2.4.2 rmind * This code is derived from software contributed to The NetBSD Foundation 8 1.2.4.2 rmind * by Taylor R. Campbell. 9 1.2.4.2 rmind * 10 1.2.4.2 rmind * Redistribution and use in source and binary forms, with or without 11 1.2.4.2 rmind * modification, are permitted provided that the following conditions 12 1.2.4.2 rmind * are met: 13 1.2.4.2 rmind * 1. Redistributions of source code must retain the above copyright 14 1.2.4.2 rmind * notice, this list of conditions and the following disclaimer. 15 1.2.4.2 rmind * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.4.2 rmind * notice, this list of conditions and the following disclaimer in the 17 1.2.4.2 rmind * documentation and/or other materials provided with the distribution. 18 1.2.4.2 rmind * 19 1.2.4.2 rmind * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.4.2 rmind * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.4.2 rmind * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.4.2 rmind * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.4.2 rmind * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.4.2 rmind * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.4.2 rmind * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.4.2 rmind * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.4.2 rmind * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.4.2 rmind * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.4.2 rmind * POSSIBILITY OF SUCH DAMAGE. 30 1.2.4.2 rmind */ 31 1.2.4.2 rmind 32 1.2.4.2 rmind #ifndef _LINUX_IO_MAPPING_H_ 33 1.2.4.2 rmind #define _LINUX_IO_MAPPING_H_ 34 1.2.4.2 rmind 35 1.2.4.2 rmind #include <sys/bus.h> 36 1.2.4.2 rmind #include <sys/kmem.h> 37 1.2.4.2 rmind #include <sys/systm.h> 38 1.2.4.2 rmind 39 1.2.4.2 rmind struct io_mapping { 40 1.2.4.2 rmind bus_space_tag_t diom_bst; 41 1.2.4.2 rmind bus_addr_t diom_addr; 42 1.2.4.2 rmind bus_size_t diom_size; 43 1.2.4.2 rmind int diom_flags; 44 1.2.4.2 rmind bus_space_handle_t diom_bsh; 45 1.2.4.2 rmind void *diom_vaddr; 46 1.2.4.2 rmind }; 47 1.2.4.2 rmind 48 1.2.4.2 rmind static inline struct io_mapping * 49 1.2.4.2 rmind bus_space_io_mapping_create_wc(bus_space_tag_t bst, bus_addr_t addr, 50 1.2.4.2 rmind bus_size_t size) 51 1.2.4.2 rmind { 52 1.2.4.2 rmind struct io_mapping *const mapping = kmem_alloc(sizeof(*mapping), 53 1.2.4.2 rmind KM_SLEEP); 54 1.2.4.2 rmind mapping->diom_bst = bst; 55 1.2.4.2 rmind mapping->diom_addr = addr; 56 1.2.4.2 rmind mapping->diom_size = size; 57 1.2.4.2 rmind mapping->diom_flags = 0; 58 1.2.4.2 rmind mapping->diom_flags |= BUS_SPACE_MAP_LINEAR; 59 1.2.4.2 rmind mapping->diom_flags |= BUS_SPACE_MAP_PREFETCHABLE; 60 1.2.4.2 rmind mapping->diom_vaddr = NULL; 61 1.2.4.2 rmind 62 1.2.4.2 rmind bus_space_handle_t bsh; 63 1.2.4.2 rmind if (bus_space_map(mapping->diom_bst, addr, PAGE_SIZE, 64 1.2.4.2 rmind mapping->diom_flags, &bsh)) { 65 1.2.4.2 rmind kmem_free(mapping, sizeof(*mapping)); 66 1.2.4.2 rmind return NULL; 67 1.2.4.2 rmind } 68 1.2.4.2 rmind bus_space_unmap(mapping->diom_bst, bsh, PAGE_SIZE); 69 1.2.4.2 rmind 70 1.2.4.2 rmind return mapping; 71 1.2.4.2 rmind } 72 1.2.4.2 rmind 73 1.2.4.2 rmind static inline void 74 1.2.4.2 rmind io_mapping_free(struct io_mapping *mapping) 75 1.2.4.2 rmind { 76 1.2.4.2 rmind 77 1.2.4.2 rmind KASSERT(mapping->diom_vaddr == NULL); 78 1.2.4.2 rmind kmem_free(mapping, sizeof(*mapping)); 79 1.2.4.2 rmind } 80 1.2.4.2 rmind 81 1.2.4.2 rmind static inline void * 82 1.2.4.2 rmind io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) 83 1.2.4.2 rmind { 84 1.2.4.2 rmind 85 1.2.4.2 rmind KASSERT(mapping->diom_vaddr == NULL); 86 1.2.4.2 rmind KASSERT(ISSET(mapping->diom_flags, BUS_SPACE_MAP_LINEAR)); 87 1.2.4.2 rmind if (bus_space_map(mapping->diom_bst, (mapping->diom_addr + offset), 88 1.2.4.2 rmind PAGE_SIZE, mapping->diom_flags, &mapping->diom_bsh)) 89 1.2.4.2 rmind panic("Unable to make I/O mapping!"); /* XXX */ 90 1.2.4.2 rmind mapping->diom_vaddr = bus_space_vaddr(mapping->diom_bst, 91 1.2.4.2 rmind mapping->diom_bsh); 92 1.2.4.2 rmind 93 1.2.4.2 rmind return mapping->diom_vaddr; 94 1.2.4.2 rmind } 95 1.2.4.2 rmind 96 1.2.4.2 rmind static inline void 97 1.2.4.2 rmind io_mapping_unmap(struct io_mapping *mapping, void *vaddr __unused) 98 1.2.4.2 rmind { 99 1.2.4.2 rmind 100 1.2.4.2 rmind KASSERT(mapping->diom_vaddr == vaddr); 101 1.2.4.2 rmind bus_space_unmap(mapping->diom_bst, mapping->diom_bsh, PAGE_SIZE); 102 1.2.4.2 rmind mapping->diom_vaddr = NULL; 103 1.2.4.2 rmind } 104 1.2.4.2 rmind 105 1.2.4.2 rmind static inline void * 106 1.2.4.2 rmind io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset) 107 1.2.4.2 rmind { 108 1.2.4.2 rmind return io_mapping_map_wc(mapping, offset); 109 1.2.4.2 rmind } 110 1.2.4.2 rmind 111 1.2.4.2 rmind static inline void 112 1.2.4.2 rmind io_mapping_unmap_atomic(struct io_mapping *mapping, void *vaddr __unused) 113 1.2.4.2 rmind { 114 1.2.4.2 rmind return io_mapping_unmap(mapping, vaddr); 115 1.2.4.2 rmind } 116 1.2.4.2 rmind 117 1.2.4.2 rmind #endif /* _LINUX_IO_MAPPING_H_ */ 118
Indexes created Wed Oct 01 18:09:54 GMT 2025