1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #ifndef _LINUX_IO_MAPPING_H_ 33 #define _LINUX_IO_MAPPING_H_ 34 35 #include <sys/types.h> 36 #include <machine/vm.h> 37 38 #include <linux/types.h> 39 #include <linux/io.h> 40 #include <linux/slab.h> 41 42 struct io_mapping { 43 unsigned long base; 44 unsigned long size; 45 void *mem; 46 vm_memattr_t attr; 47 }; 48 49 static inline struct io_mapping * 50 io_mapping_init_wc(struct io_mapping *mapping, resource_size_t base, 51 unsigned long size) 52 { 53 54 mapping->base = base; 55 mapping->size = size; 56 #ifdef VM_MEMATTR_WRITE_COMBINING 57 mapping->mem = ioremap_wc(base, size); 58 mapping->attr = VM_MEMATTR_WRITE_COMBINING; 59 #else 60 mapping->mem = ioremap_nocache(base, size); 61 mapping->attr = VM_MEMATTR_UNCACHEABLE; 62 #endif 63 return (mapping); 64 } 65 66 static inline struct io_mapping * 67 io_mapping_create_wc(resource_size_t base, unsigned long size) 68 { 69 struct io_mapping *mapping; 70 71 mapping = kmalloc(sizeof(*mapping), GFP_KERNEL); 72 if (mapping == NULL) 73 return (NULL); 74 return (io_mapping_init_wc(mapping, base, size)); 75 } 76 77 static inline void 78 io_mapping_fini(struct io_mapping *mapping) 79 { 80 81 iounmap(mapping->mem); 82 } 83 84 static inline void 85 io_mapping_free(struct io_mapping *mapping) 86 { 87 88 io_mapping_fini(mapping->mem); 89 kfree(mapping); 90 } 91 92 static inline void * 93 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset) 94 { 95 96 return ((char *)mapping->mem + offset); 97 } 98 99 static inline void 100 io_mapping_unmap_atomic(void *vaddr) 101 { 102 } 103 104 static inline void * 105 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset, 106 unsigned long size) 107 { 108 109 return ((char *)mapping->mem + offset); 110 } 111 112 static inline void 113 io_mapping_unmap(void *vaddr) 114 { 115 } 116 117 #endif /* _LINUX_IO_MAPPING_H_ */ 118