Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2008 Keith Packard <keithp@keithp.com> |
| 3 | * |
| 4 | * This file is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of version 2 of the GNU General Public License |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program; if not, write to the Free Software Foundation, |
| 15 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | */ |
| 17 | |
| 18 | #ifndef _LINUX_IO_MAPPING_H |
| 19 | #define _LINUX_IO_MAPPING_H |
| 20 | |
| 21 | #include <linux/types.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | #include <linux/slab.h> |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 23 | #include <asm/io.h> |
| 24 | #include <asm/page.h> |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 25 | |
| 26 | /* |
| 27 | * The io_mapping mechanism provides an abstraction for mapping |
| 28 | * individual pages from an io device to the CPU in an efficient fashion. |
| 29 | * |
| 30 | * See Documentation/io_mapping.txt |
| 31 | */ |
| 32 | |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 33 | #ifdef CONFIG_HAVE_ATOMIC_IOMAP |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 34 | |
Dave Airlie | 31ce4bf | 2010-08-12 11:47:50 +1000 | [diff] [blame] | 35 | #include <asm/iomap.h> |
| 36 | |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 37 | struct io_mapping { |
| 38 | resource_size_t base; |
| 39 | unsigned long size; |
| 40 | pgprot_t prot; |
| 41 | }; |
| 42 | |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 43 | /* |
| 44 | * For small address space machines, mapping large objects |
| 45 | * into the kernel virtual space isn't practical. Where |
| 46 | * available, use fixmap support to dynamically map pages |
| 47 | * of the object at run time. |
| 48 | */ |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 49 | |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 50 | static inline struct io_mapping * |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 51 | io_mapping_create_wc(resource_size_t base, unsigned long size) |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 52 | { |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 53 | struct io_mapping *iomap; |
Venkatesh Pallipadi | 9e36fda0 | 2009-07-10 09:57:35 -0700 | [diff] [blame] | 54 | pgprot_t prot; |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 55 | |
| 56 | iomap = kmalloc(sizeof(*iomap), GFP_KERNEL); |
| 57 | if (!iomap) |
Venkatesh Pallipadi | 9e36fda0 | 2009-07-10 09:57:35 -0700 | [diff] [blame] | 58 | goto out_err; |
| 59 | |
| 60 | if (iomap_create_wc(base, size, &prot)) |
| 61 | goto out_free; |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 62 | |
| 63 | iomap->base = base; |
| 64 | iomap->size = size; |
Venkatesh Pallipadi | 9e36fda0 | 2009-07-10 09:57:35 -0700 | [diff] [blame] | 65 | iomap->prot = prot; |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 66 | return iomap; |
Venkatesh Pallipadi | 9e36fda0 | 2009-07-10 09:57:35 -0700 | [diff] [blame] | 67 | |
| 68 | out_free: |
| 69 | kfree(iomap); |
| 70 | out_err: |
| 71 | return NULL; |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | static inline void |
| 75 | io_mapping_free(struct io_mapping *mapping) |
| 76 | { |
Venkatesh Pallipadi | 9e36fda0 | 2009-07-10 09:57:35 -0700 | [diff] [blame] | 77 | iomap_free(mapping->base, mapping->size); |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 78 | kfree(mapping); |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | /* Atomic map/unmap */ |
Francisco Jerez | 29bc17e | 2010-09-04 22:56:44 +0200 | [diff] [blame] | 82 | static inline void __iomem * |
Chris Wilson | fca3ec0 | 2010-08-04 14:34:24 +0100 | [diff] [blame] | 83 | io_mapping_map_atomic_wc(struct io_mapping *mapping, |
Peter Zijlstra | 3e4d3af | 2010-10-26 14:21:51 -0700 | [diff] [blame] | 84 | unsigned long offset) |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 85 | { |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 86 | resource_size_t phys_addr; |
| 87 | unsigned long pfn; |
| 88 | |
| 89 | BUG_ON(offset >= mapping->size); |
| 90 | phys_addr = mapping->base + offset; |
| 91 | pfn = (unsigned long) (phys_addr >> PAGE_SHIFT); |
Peter Zijlstra | 3e4d3af | 2010-10-26 14:21:51 -0700 | [diff] [blame] | 92 | return iomap_atomic_prot_pfn(pfn, mapping->prot); |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | static inline void |
Peter Zijlstra | 3e4d3af | 2010-10-26 14:21:51 -0700 | [diff] [blame] | 96 | io_mapping_unmap_atomic(void __iomem *vaddr) |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 97 | { |
Peter Zijlstra | 3e4d3af | 2010-10-26 14:21:51 -0700 | [diff] [blame] | 98 | iounmap_atomic(vaddr); |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 99 | } |
| 100 | |
Francisco Jerez | 29bc17e | 2010-09-04 22:56:44 +0200 | [diff] [blame] | 101 | static inline void __iomem * |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 102 | io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) |
| 103 | { |
Pallipadi, Venkatesh | 5ce04e3 | 2009-03-01 08:53:27 -0800 | [diff] [blame] | 104 | resource_size_t phys_addr; |
| 105 | |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 106 | BUG_ON(offset >= mapping->size); |
Pallipadi, Venkatesh | 5ce04e3 | 2009-03-01 08:53:27 -0800 | [diff] [blame] | 107 | phys_addr = mapping->base + offset; |
| 108 | |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 109 | return ioremap_wc(phys_addr, PAGE_SIZE); |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | static inline void |
Francisco Jerez | 29bc17e | 2010-09-04 22:56:44 +0200 | [diff] [blame] | 113 | io_mapping_unmap(void __iomem *vaddr) |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 114 | { |
| 115 | iounmap(vaddr); |
| 116 | } |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 117 | |
| 118 | #else |
| 119 | |
Daniel Vetter | 24dd85f | 2011-09-28 11:57:23 +0200 | [diff] [blame^] | 120 | #include <linux/uaccess.h> |
| 121 | |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 122 | /* this struct isn't actually defined anywhere */ |
| 123 | struct io_mapping; |
| 124 | |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 125 | /* Create the io_mapping object*/ |
| 126 | static inline struct io_mapping * |
Venkatesh Pallipadi | 4ab0d47 | 2009-02-24 17:35:12 -0800 | [diff] [blame] | 127 | io_mapping_create_wc(resource_size_t base, unsigned long size) |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 128 | { |
Francisco Jerez | 29bc17e | 2010-09-04 22:56:44 +0200 | [diff] [blame] | 129 | return (struct io_mapping __force *) ioremap_wc(base, size); |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | static inline void |
| 133 | io_mapping_free(struct io_mapping *mapping) |
| 134 | { |
Francisco Jerez | 29bc17e | 2010-09-04 22:56:44 +0200 | [diff] [blame] | 135 | iounmap((void __force __iomem *) mapping); |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 136 | } |
| 137 | |
| 138 | /* Atomic map/unmap */ |
Francisco Jerez | 29bc17e | 2010-09-04 22:56:44 +0200 | [diff] [blame] | 139 | static inline void __iomem * |
Chris Wilson | fca3ec0 | 2010-08-04 14:34:24 +0100 | [diff] [blame] | 140 | io_mapping_map_atomic_wc(struct io_mapping *mapping, |
Peter Zijlstra | 3e4d3af | 2010-10-26 14:21:51 -0700 | [diff] [blame] | 141 | unsigned long offset) |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 142 | { |
Daniel Vetter | 24dd85f | 2011-09-28 11:57:23 +0200 | [diff] [blame^] | 143 | pagefault_disable(); |
Francisco Jerez | 29bc17e | 2010-09-04 22:56:44 +0200 | [diff] [blame] | 144 | return ((char __force __iomem *) mapping) + offset; |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | static inline void |
Peter Zijlstra | 3e4d3af | 2010-10-26 14:21:51 -0700 | [diff] [blame] | 148 | io_mapping_unmap_atomic(void __iomem *vaddr) |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 149 | { |
Daniel Vetter | 24dd85f | 2011-09-28 11:57:23 +0200 | [diff] [blame^] | 150 | pagefault_enable(); |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | /* Non-atomic map/unmap */ |
Francisco Jerez | 29bc17e | 2010-09-04 22:56:44 +0200 | [diff] [blame] | 154 | static inline void __iomem * |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 155 | io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) |
| 156 | { |
Francisco Jerez | 29bc17e | 2010-09-04 22:56:44 +0200 | [diff] [blame] | 157 | return ((char __force __iomem *) mapping) + offset; |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | static inline void |
Francisco Jerez | 29bc17e | 2010-09-04 22:56:44 +0200 | [diff] [blame] | 161 | io_mapping_unmap(void __iomem *vaddr) |
Keith Packard | e5beae1 | 2008-11-03 18:21:45 +0100 | [diff] [blame] | 162 | { |
| 163 | } |
| 164 | |
| 165 | #endif /* HAVE_ATOMIC_IOMAP */ |
Keith Packard | 9663f2e | 2008-10-30 19:38:18 -0700 | [diff] [blame] | 166 | |
| 167 | #endif /* _LINUX_IO_MAPPING_H */ |