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 mapping->mem = ioremap_wc(base, size); 57 mapping->attr = VM_MEMATTR_WRITE_COMBINING; 58 return (mapping); 59 } 60 61 static inline struct io_mapping * 62 io_mapping_create_wc(resource_size_t base, unsigned long size) 63 { 64 struct io_mapping *mapping; 65 66 mapping = kmalloc(sizeof(*mapping), GFP_KERNEL); 67 if (mapping == NULL) 68 return (NULL); 69 return (io_mapping_init_wc(mapping, base, size)); 70 } 71 72 static inline void 73 io_mapping_fini(struct io_mapping *mapping) 74 { 75 76 iounmap(mapping->mem); 77 } 78 79 static inline void 80 io_mapping_free(struct io_mapping *mapping) 81 { 82 83 io_mapping_fini(mapping->mem); 84 kfree(mapping); 85 } 86 87 static inline void * 88 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset) 89 { 90 91 return ((char *)mapping->mem + offset); 92 } 93 94 static inline void 95 io_mapping_unmap_atomic(void *vaddr) 96 { 97 } 98 99 static inline void * 100 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset, 101 unsigned long size) 102 { 103 104 return ((char *)mapping->mem + offset); 105 } 106 107 static inline void 108 io_mapping_unmap(void *vaddr) 109 { 110 } 111 112 #endif /* _LINUX_IO_MAPPING_H_ */ 113