1 /* $NetBSD: io-mapping.h,v 1.2 2014/03/18 18:20:43 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_IO_MAPPING_H_ 33 #define _LINUX_IO_MAPPING_H_ 34 35 #include <sys/bus.h> 36 #include <sys/kmem.h> 37 #include <sys/systm.h> 38 39 struct io_mapping { 40 bus_space_tag_t diom_bst; 41 bus_addr_t diom_addr; 42 bus_size_t diom_size; 43 int diom_flags; 44 bus_space_handle_t diom_bsh; 45 void *diom_vaddr; 46 }; 47 48 static inline struct io_mapping * 49 bus_space_io_mapping_create_wc(bus_space_tag_t bst, bus_addr_t addr, 50 bus_size_t size) 51 { 52 struct io_mapping *const mapping = kmem_alloc(sizeof(*mapping), 53 KM_SLEEP); 54 mapping->diom_bst = bst; 55 mapping->diom_addr = addr; 56 mapping->diom_size = size; 57 mapping->diom_flags = 0; 58 mapping->diom_flags |= BUS_SPACE_MAP_LINEAR; 59 mapping->diom_flags |= BUS_SPACE_MAP_PREFETCHABLE; 60 mapping->diom_vaddr = NULL; 61 62 bus_space_handle_t bsh; 63 if (bus_space_map(mapping->diom_bst, addr, PAGE_SIZE, 64 mapping->diom_flags, &bsh)) { 65 kmem_free(mapping, sizeof(*mapping)); 66 return NULL; 67 } 68 bus_space_unmap(mapping->diom_bst, bsh, PAGE_SIZE); 69 70 return mapping; 71 } 72 73 static inline void 74 io_mapping_free(struct io_mapping *mapping) 75 { 76 77 KASSERT(mapping->diom_vaddr == NULL); 78 kmem_free(mapping, sizeof(*mapping)); 79 } 80 81 static inline void * 82 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) 83 { 84 85 KASSERT(mapping->diom_vaddr == NULL); 86 KASSERT(ISSET(mapping->diom_flags, BUS_SPACE_MAP_LINEAR)); 87 if (bus_space_map(mapping->diom_bst, (mapping->diom_addr + offset), 88 PAGE_SIZE, mapping->diom_flags, &mapping->diom_bsh)) 89 panic("Unable to make I/O mapping!"); /* XXX */ 90 mapping->diom_vaddr = bus_space_vaddr(mapping->diom_bst, 91 mapping->diom_bsh); 92 93 return mapping->diom_vaddr; 94 } 95 96 static inline void 97 io_mapping_unmap(struct io_mapping *mapping, void *vaddr __unused) 98 { 99 100 KASSERT(mapping->diom_vaddr == vaddr); 101 bus_space_unmap(mapping->diom_bst, mapping->diom_bsh, PAGE_SIZE); 102 mapping->diom_vaddr = NULL; 103 } 104 105 static inline void * 106 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset) 107 { 108 return io_mapping_map_wc(mapping, offset); 109 } 110 111 static inline void 112 io_mapping_unmap_atomic(struct io_mapping *mapping, void *vaddr __unused) 113 { 114 return io_mapping_unmap(mapping, vaddr); 115 } 116 117 #endif /* _LINUX_IO_MAPPING_H_ */ 118