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1 | /* | |
2 | * ioport.h Definitions of routines for detecting, reserving and | |
3 | * allocating system resources. | |
4 | * | |
5 | * Authors: Linus Torvalds | |
6 | */ | |
7 | ||
8 | #ifndef _LINUX_IOPORT_H | |
9 | #define _LINUX_IOPORT_H | |
10 | ||
11 | #ifndef __ASSEMBLY__ | |
12 | #include <linux/compiler.h> | |
13 | #include <linux/types.h> | |
14 | /* | |
15 | * Resources are tree-like, allowing | |
16 | * nesting etc.. | |
17 | */ | |
18 | struct resource { | |
19 | resource_size_t start; | |
20 | resource_size_t end; | |
21 | const char *name; | |
22 | unsigned long flags; | |
23 | unsigned long desc; | |
24 | struct resource *parent, *sibling, *child; | |
25 | }; | |
26 | ||
27 | /* | |
28 | * IO resources have these defined flags. | |
29 | */ | |
30 | #define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */ | |
31 | ||
32 | #define IORESOURCE_TYPE_BITS 0x00001f00 /* Resource type */ | |
33 | #define IORESOURCE_IO 0x00000100 /* PCI/ISA I/O ports */ | |
34 | #define IORESOURCE_MEM 0x00000200 | |
35 | #define IORESOURCE_REG 0x00000300 /* Register offsets */ | |
36 | #define IORESOURCE_IRQ 0x00000400 | |
37 | #define IORESOURCE_DMA 0x00000800 | |
38 | #define IORESOURCE_BUS 0x00001000 | |
39 | ||
40 | #define IORESOURCE_PREFETCH 0x00002000 /* No side effects */ | |
41 | #define IORESOURCE_READONLY 0x00004000 | |
42 | #define IORESOURCE_CACHEABLE 0x00008000 | |
43 | #define IORESOURCE_RANGELENGTH 0x00010000 | |
44 | #define IORESOURCE_SHADOWABLE 0x00020000 | |
45 | ||
46 | #define IORESOURCE_SIZEALIGN 0x00040000 /* size indicates alignment */ | |
47 | #define IORESOURCE_STARTALIGN 0x00080000 /* start field is alignment */ | |
48 | ||
49 | #define IORESOURCE_MEM_64 0x00100000 | |
50 | #define IORESOURCE_WINDOW 0x00200000 /* forwarded by bridge */ | |
51 | #define IORESOURCE_MUXED 0x00400000 /* Resource is software muxed */ | |
52 | ||
53 | #define IORESOURCE_EXT_TYPE_BITS 0x01000000 /* Resource extended types */ | |
54 | #define IORESOURCE_SYSRAM 0x01000000 /* System RAM (modifier) */ | |
55 | ||
56 | #define IORESOURCE_EXCLUSIVE 0x08000000 /* Userland may not map this resource */ | |
57 | ||
58 | #define IORESOURCE_DISABLED 0x10000000 | |
59 | #define IORESOURCE_UNSET 0x20000000 /* No address assigned yet */ | |
60 | #define IORESOURCE_AUTO 0x40000000 | |
61 | #define IORESOURCE_BUSY 0x80000000 /* Driver has marked this resource busy */ | |
62 | ||
63 | /* I/O resource extended types */ | |
64 | #define IORESOURCE_SYSTEM_RAM (IORESOURCE_MEM|IORESOURCE_SYSRAM) | |
65 | ||
66 | /* PnP IRQ specific bits (IORESOURCE_BITS) */ | |
67 | #define IORESOURCE_IRQ_HIGHEDGE (1<<0) | |
68 | #define IORESOURCE_IRQ_LOWEDGE (1<<1) | |
69 | #define IORESOURCE_IRQ_HIGHLEVEL (1<<2) | |
70 | #define IORESOURCE_IRQ_LOWLEVEL (1<<3) | |
71 | #define IORESOURCE_IRQ_SHAREABLE (1<<4) | |
72 | #define IORESOURCE_IRQ_OPTIONAL (1<<5) | |
73 | ||
74 | /* PnP DMA specific bits (IORESOURCE_BITS) */ | |
75 | #define IORESOURCE_DMA_TYPE_MASK (3<<0) | |
76 | #define IORESOURCE_DMA_8BIT (0<<0) | |
77 | #define IORESOURCE_DMA_8AND16BIT (1<<0) | |
78 | #define IORESOURCE_DMA_16BIT (2<<0) | |
79 | ||
80 | #define IORESOURCE_DMA_MASTER (1<<2) | |
81 | #define IORESOURCE_DMA_BYTE (1<<3) | |
82 | #define IORESOURCE_DMA_WORD (1<<4) | |
83 | ||
84 | #define IORESOURCE_DMA_SPEED_MASK (3<<6) | |
85 | #define IORESOURCE_DMA_COMPATIBLE (0<<6) | |
86 | #define IORESOURCE_DMA_TYPEA (1<<6) | |
87 | #define IORESOURCE_DMA_TYPEB (2<<6) | |
88 | #define IORESOURCE_DMA_TYPEF (3<<6) | |
89 | ||
90 | /* PnP memory I/O specific bits (IORESOURCE_BITS) */ | |
91 | #define IORESOURCE_MEM_WRITEABLE (1<<0) /* dup: IORESOURCE_READONLY */ | |
92 | #define IORESOURCE_MEM_CACHEABLE (1<<1) /* dup: IORESOURCE_CACHEABLE */ | |
93 | #define IORESOURCE_MEM_RANGELENGTH (1<<2) /* dup: IORESOURCE_RANGELENGTH */ | |
94 | #define IORESOURCE_MEM_TYPE_MASK (3<<3) | |
95 | #define IORESOURCE_MEM_8BIT (0<<3) | |
96 | #define IORESOURCE_MEM_16BIT (1<<3) | |
97 | #define IORESOURCE_MEM_8AND16BIT (2<<3) | |
98 | #define IORESOURCE_MEM_32BIT (3<<3) | |
99 | #define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */ | |
100 | #define IORESOURCE_MEM_EXPANSIONROM (1<<6) | |
101 | ||
102 | /* PnP I/O specific bits (IORESOURCE_BITS) */ | |
103 | #define IORESOURCE_IO_16BIT_ADDR (1<<0) | |
104 | #define IORESOURCE_IO_FIXED (1<<1) | |
105 | #define IORESOURCE_IO_SPARSE (1<<2) | |
106 | ||
107 | /* PCI ROM control bits (IORESOURCE_BITS) */ | |
108 | #define IORESOURCE_ROM_ENABLE (1<<0) /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */ | |
109 | #define IORESOURCE_ROM_SHADOW (1<<1) /* Use RAM image, not ROM BAR */ | |
110 | ||
111 | /* PCI control bits. Shares IORESOURCE_BITS with above PCI ROM. */ | |
112 | #define IORESOURCE_PCI_FIXED (1<<4) /* Do not move resource */ | |
113 | ||
114 | /* | |
115 | * I/O Resource Descriptors | |
116 | * | |
117 | * Descriptors are used by walk_iomem_res_desc() and region_intersects() | |
118 | * for searching a specific resource range in the iomem table. Assign | |
119 | * a new descriptor when a resource range supports the search interfaces. | |
120 | * Otherwise, resource.desc must be set to IORES_DESC_NONE (0). | |
121 | */ | |
122 | enum { | |
123 | IORES_DESC_NONE = 0, | |
124 | IORES_DESC_CRASH_KERNEL = 1, | |
125 | IORES_DESC_ACPI_TABLES = 2, | |
126 | IORES_DESC_ACPI_NV_STORAGE = 3, | |
127 | IORES_DESC_PERSISTENT_MEMORY = 4, | |
128 | IORES_DESC_PERSISTENT_MEMORY_LEGACY = 5, | |
129 | }; | |
130 | ||
131 | /* helpers to define resources */ | |
132 | #define DEFINE_RES_NAMED(_start, _size, _name, _flags) \ | |
133 | { \ | |
134 | .start = (_start), \ | |
135 | .end = (_start) + (_size) - 1, \ | |
136 | .name = (_name), \ | |
137 | .flags = (_flags), \ | |
138 | .desc = IORES_DESC_NONE, \ | |
139 | } | |
140 | ||
141 | #define DEFINE_RES_IO_NAMED(_start, _size, _name) \ | |
142 | DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO) | |
143 | #define DEFINE_RES_IO(_start, _size) \ | |
144 | DEFINE_RES_IO_NAMED((_start), (_size), NULL) | |
145 | ||
146 | #define DEFINE_RES_MEM_NAMED(_start, _size, _name) \ | |
147 | DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM) | |
148 | #define DEFINE_RES_MEM(_start, _size) \ | |
149 | DEFINE_RES_MEM_NAMED((_start), (_size), NULL) | |
150 | ||
151 | #define DEFINE_RES_IRQ_NAMED(_irq, _name) \ | |
152 | DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ) | |
153 | #define DEFINE_RES_IRQ(_irq) \ | |
154 | DEFINE_RES_IRQ_NAMED((_irq), NULL) | |
155 | ||
156 | #define DEFINE_RES_DMA_NAMED(_dma, _name) \ | |
157 | DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA) | |
158 | #define DEFINE_RES_DMA(_dma) \ | |
159 | DEFINE_RES_DMA_NAMED((_dma), NULL) | |
160 | ||
161 | /* PC/ISA/whatever - the normal PC address spaces: IO and memory */ | |
162 | extern struct resource ioport_resource; | |
163 | extern struct resource iomem_resource; | |
164 | ||
165 | extern struct resource *request_resource_conflict(struct resource *root, struct resource *new); | |
166 | extern int request_resource(struct resource *root, struct resource *new); | |
167 | extern int release_resource(struct resource *new); | |
168 | void release_child_resources(struct resource *new); | |
169 | extern void reserve_region_with_split(struct resource *root, | |
170 | resource_size_t start, resource_size_t end, | |
171 | const char *name); | |
172 | extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new); | |
173 | extern int insert_resource(struct resource *parent, struct resource *new); | |
174 | extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new); | |
175 | extern int remove_resource(struct resource *old); | |
176 | extern void arch_remove_reservations(struct resource *avail); | |
177 | extern int allocate_resource(struct resource *root, struct resource *new, | |
178 | resource_size_t size, resource_size_t min, | |
179 | resource_size_t max, resource_size_t align, | |
180 | resource_size_t (*alignf)(void *, | |
181 | const struct resource *, | |
182 | resource_size_t, | |
183 | resource_size_t), | |
184 | void *alignf_data); | |
185 | struct resource *lookup_resource(struct resource *root, resource_size_t start); | |
186 | int adjust_resource(struct resource *res, resource_size_t start, | |
187 | resource_size_t size); | |
188 | resource_size_t resource_alignment(struct resource *res); | |
189 | static inline resource_size_t resource_size(const struct resource *res) | |
190 | { | |
191 | return res->end - res->start + 1; | |
192 | } | |
193 | static inline unsigned long resource_type(const struct resource *res) | |
194 | { | |
195 | return res->flags & IORESOURCE_TYPE_BITS; | |
196 | } | |
197 | static inline unsigned long resource_ext_type(const struct resource *res) | |
198 | { | |
199 | return res->flags & IORESOURCE_EXT_TYPE_BITS; | |
200 | } | |
201 | /* True iff r1 completely contains r2 */ | |
202 | static inline bool resource_contains(struct resource *r1, struct resource *r2) | |
203 | { | |
204 | if (resource_type(r1) != resource_type(r2)) | |
205 | return false; | |
206 | if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET) | |
207 | return false; | |
208 | return r1->start <= r2->start && r1->end >= r2->end; | |
209 | } | |
210 | ||
211 | ||
212 | /* Convenience shorthand with allocation */ | |
213 | #define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0) | |
214 | #define request_muxed_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED) | |
215 | #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl) | |
216 | #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0) | |
217 | #define request_mem_region_exclusive(start,n,name) \ | |
218 | __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE) | |
219 | #define rename_region(region, newname) do { (region)->name = (newname); } while (0) | |
220 | ||
221 | extern struct resource * __request_region(struct resource *, | |
222 | resource_size_t start, | |
223 | resource_size_t n, | |
224 | const char *name, int flags); | |
225 | ||
226 | /* Compatibility cruft */ | |
227 | #define release_region(start,n) __release_region(&ioport_resource, (start), (n)) | |
228 | #define release_mem_region(start,n) __release_region(&iomem_resource, (start), (n)) | |
229 | ||
230 | extern void __release_region(struct resource *, resource_size_t, | |
231 | resource_size_t); | |
232 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
233 | extern int release_mem_region_adjustable(struct resource *, resource_size_t, | |
234 | resource_size_t); | |
235 | #endif | |
236 | ||
237 | /* Wrappers for managed devices */ | |
238 | struct device; | |
239 | ||
240 | extern int devm_request_resource(struct device *dev, struct resource *root, | |
241 | struct resource *new); | |
242 | extern void devm_release_resource(struct device *dev, struct resource *new); | |
243 | ||
244 | #define devm_request_region(dev,start,n,name) \ | |
245 | __devm_request_region(dev, &ioport_resource, (start), (n), (name)) | |
246 | #define devm_request_mem_region(dev,start,n,name) \ | |
247 | __devm_request_region(dev, &iomem_resource, (start), (n), (name)) | |
248 | ||
249 | extern struct resource * __devm_request_region(struct device *dev, | |
250 | struct resource *parent, resource_size_t start, | |
251 | resource_size_t n, const char *name); | |
252 | ||
253 | #define devm_release_region(dev, start, n) \ | |
254 | __devm_release_region(dev, &ioport_resource, (start), (n)) | |
255 | #define devm_release_mem_region(dev, start, n) \ | |
256 | __devm_release_region(dev, &iomem_resource, (start), (n)) | |
257 | ||
258 | extern void __devm_release_region(struct device *dev, struct resource *parent, | |
259 | resource_size_t start, resource_size_t n); | |
260 | extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size); | |
261 | extern int iomem_is_exclusive(u64 addr); | |
262 | ||
263 | extern int | |
264 | walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, | |
265 | void *arg, int (*func)(unsigned long, unsigned long, void *)); | |
266 | extern int | |
267 | walk_system_ram_res(u64 start, u64 end, void *arg, | |
268 | int (*func)(u64, u64, void *)); | |
269 | extern int | |
270 | walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end, | |
271 | void *arg, int (*func)(u64, u64, void *)); | |
272 | ||
273 | /* True if any part of r1 overlaps r2 */ | |
274 | static inline bool resource_overlaps(struct resource *r1, struct resource *r2) | |
275 | { | |
276 | return (r1->start <= r2->end && r1->end >= r2->start); | |
277 | } | |
278 | ||
279 | ||
280 | #endif /* __ASSEMBLY__ */ | |
281 | #endif /* _LINUX_IOPORT_H */ |