1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * ioport.h Definitions of routines for detecting, reserving and
4 * allocating system resources.
5 *
6 * Authors: Linus Torvalds
7 */
8
9 #ifndef _LINUX_IOPORT_H
10 #define _LINUX_IOPORT_H
11
12 #ifndef __ASSEMBLY__
13 #include <linux/bits.h>
14 #include <linux/compiler.h>
15 #include <linux/minmax.h>
16 #include <linux/types.h>
17 /*
18 * Resources are tree-like, allowing
19 * nesting etc..
20 */
21 struct resource {
22 resource_size_t start;
23 resource_size_t end;
24 const char *name;
25 unsigned long flags;
26 unsigned long desc;
27 struct resource *parent, *sibling, *child;
28 };
29
30 /*
31 * IO resources have these defined flags.
32 *
33 * PCI devices expose these flags to userspace in the "resource" sysfs file,
34 * so don't move them.
35 */
36 #define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */
37
38 #define IORESOURCE_TYPE_BITS 0x00001f00 /* Resource type */
39 #define IORESOURCE_IO 0x00000100 /* PCI/ISA I/O ports */
40 #define IORESOURCE_MEM 0x00000200
41 #define IORESOURCE_REG 0x00000300 /* Register offsets */
42 #define IORESOURCE_IRQ 0x00000400
43 #define IORESOURCE_DMA 0x00000800
44 #define IORESOURCE_BUS 0x00001000
45
46 #define IORESOURCE_PREFETCH 0x00002000 /* No side effects */
47 #define IORESOURCE_READONLY 0x00004000
48 #define IORESOURCE_CACHEABLE 0x00008000
49 #define IORESOURCE_RANGELENGTH 0x00010000
50 #define IORESOURCE_SHADOWABLE 0x00020000
51
52 #define IORESOURCE_SIZEALIGN 0x00040000 /* size indicates alignment */
53 #define IORESOURCE_STARTALIGN 0x00080000 /* start field is alignment */
54
55 #define IORESOURCE_MEM_64 0x00100000
56 #define IORESOURCE_WINDOW 0x00200000 /* forwarded by bridge */
57 #define IORESOURCE_MUXED 0x00400000 /* Resource is software muxed */
58
59 #define IORESOURCE_EXT_TYPE_BITS 0x01000000 /* Resource extended types */
60 #define IORESOURCE_SYSRAM 0x01000000 /* System RAM (modifier) */
61
62 /* IORESOURCE_SYSRAM specific bits. */
63 #define IORESOURCE_SYSRAM_DRIVER_MANAGED 0x02000000 /* Always detected via a driver. */
64 #define IORESOURCE_SYSRAM_MERGEABLE 0x04000000 /* Resource can be merged. */
65
66 #define IORESOURCE_EXCLUSIVE 0x08000000 /* Userland may not map this resource */
67
68 #define IORESOURCE_DISABLED 0x10000000
69 #define IORESOURCE_UNSET 0x20000000 /* No address assigned yet */
70 #define IORESOURCE_AUTO 0x40000000
71 #define IORESOURCE_BUSY 0x80000000 /* Driver has marked this resource busy */
72
73 /* I/O resource extended types */
74 #define IORESOURCE_SYSTEM_RAM (IORESOURCE_MEM|IORESOURCE_SYSRAM)
75
76 /* PnP IRQ specific bits (IORESOURCE_BITS) */
77 #define IORESOURCE_IRQ_HIGHEDGE (1<<0)
78 #define IORESOURCE_IRQ_LOWEDGE (1<<1)
79 #define IORESOURCE_IRQ_HIGHLEVEL (1<<2)
80 #define IORESOURCE_IRQ_LOWLEVEL (1<<3)
81 #define IORESOURCE_IRQ_SHAREABLE (1<<4)
82 #define IORESOURCE_IRQ_OPTIONAL (1<<5)
83 #define IORESOURCE_IRQ_WAKECAPABLE (1<<6)
84
85 /* PnP DMA specific bits (IORESOURCE_BITS) */
86 #define IORESOURCE_DMA_TYPE_MASK (3<<0)
87 #define IORESOURCE_DMA_8BIT (0<<0)
88 #define IORESOURCE_DMA_8AND16BIT (1<<0)
89 #define IORESOURCE_DMA_16BIT (2<<0)
90
91 #define IORESOURCE_DMA_MASTER (1<<2)
92 #define IORESOURCE_DMA_BYTE (1<<3)
93 #define IORESOURCE_DMA_WORD (1<<4)
94
95 #define IORESOURCE_DMA_SPEED_MASK (3<<6)
96 #define IORESOURCE_DMA_COMPATIBLE (0<<6)
97 #define IORESOURCE_DMA_TYPEA (1<<6)
98 #define IORESOURCE_DMA_TYPEB (2<<6)
99 #define IORESOURCE_DMA_TYPEF (3<<6)
100
101 /* PnP memory I/O specific bits (IORESOURCE_BITS) */
102 #define IORESOURCE_MEM_WRITEABLE (1<<0) /* dup: IORESOURCE_READONLY */
103 #define IORESOURCE_MEM_CACHEABLE (1<<1) /* dup: IORESOURCE_CACHEABLE */
104 #define IORESOURCE_MEM_RANGELENGTH (1<<2) /* dup: IORESOURCE_RANGELENGTH */
105 #define IORESOURCE_MEM_TYPE_MASK (3<<3)
106 #define IORESOURCE_MEM_8BIT (0<<3)
107 #define IORESOURCE_MEM_16BIT (1<<3)
108 #define IORESOURCE_MEM_8AND16BIT (2<<3)
109 #define IORESOURCE_MEM_32BIT (3<<3)
110 #define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */
111 #define IORESOURCE_MEM_EXPANSIONROM (1<<6)
112 #define IORESOURCE_MEM_NONPOSTED (1<<7)
113
114 /* PnP I/O specific bits (IORESOURCE_BITS) */
115 #define IORESOURCE_IO_16BIT_ADDR (1<<0)
116 #define IORESOURCE_IO_FIXED (1<<1)
117 #define IORESOURCE_IO_SPARSE (1<<2)
118
119 /* PCI ROM control bits (IORESOURCE_BITS) */
120 #define IORESOURCE_ROM_ENABLE (1<<0) /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
121 #define IORESOURCE_ROM_SHADOW (1<<1) /* Use RAM image, not ROM BAR */
122
123 /* PCI control bits. Shares IORESOURCE_BITS with above PCI ROM. */
124 #define IORESOURCE_PCI_FIXED (1<<4) /* Do not move resource */
125 #define IORESOURCE_PCI_EA_BEI (1<<5) /* BAR Equivalent Indicator */
126
127 /*
128 * I/O Resource Descriptors
129 *
130 * Descriptors are used by walk_iomem_res_desc() and region_intersects()
131 * for searching a specific resource range in the iomem table. Assign
132 * a new descriptor when a resource range supports the search interfaces.
133 * Otherwise, resource.desc must be set to IORES_DESC_NONE (0).
134 */
135 enum {
136 IORES_DESC_NONE = 0,
137 IORES_DESC_CRASH_KERNEL = 1,
138 IORES_DESC_ACPI_TABLES = 2,
139 IORES_DESC_ACPI_NV_STORAGE = 3,
140 IORES_DESC_PERSISTENT_MEMORY = 4,
141 IORES_DESC_PERSISTENT_MEMORY_LEGACY = 5,
142 IORES_DESC_DEVICE_PRIVATE_MEMORY = 6,
143 IORES_DESC_RESERVED = 7,
144 IORES_DESC_SOFT_RESERVED = 8,
145 IORES_DESC_CXL = 9,
146 };
147
148 /*
149 * Flags controlling ioremap() behavior.
150 */
151 enum {
152 IORES_MAP_SYSTEM_RAM = BIT(0),
153 IORES_MAP_ENCRYPTED = BIT(1),
154 };
155
156 /* helpers to define resources */
157 #define DEFINE_RES_NAMED(_start, _size, _name, _flags) \
158 (struct resource) { \
159 .start = (_start), \
160 .end = (_start) + (_size) - 1, \
161 .name = (_name), \
162 .flags = (_flags), \
163 .desc = IORES_DESC_NONE, \
164 }
165
166 #define DEFINE_RES_IO_NAMED(_start, _size, _name) \
167 DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
168 #define DEFINE_RES_IO(_start, _size) \
169 DEFINE_RES_IO_NAMED((_start), (_size), NULL)
170
171 #define DEFINE_RES_MEM_NAMED(_start, _size, _name) \
172 DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
173 #define DEFINE_RES_MEM(_start, _size) \
174 DEFINE_RES_MEM_NAMED((_start), (_size), NULL)
175
176 #define DEFINE_RES_REG_NAMED(_start, _size, _name) \
177 DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_REG)
178 #define DEFINE_RES_REG(_start, _size) \
179 DEFINE_RES_REG_NAMED((_start), (_size), NULL)
180
181 #define DEFINE_RES_IRQ_NAMED(_irq, _name) \
182 DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
183 #define DEFINE_RES_IRQ(_irq) \
184 DEFINE_RES_IRQ_NAMED((_irq), NULL)
185
186 #define DEFINE_RES_DMA_NAMED(_dma, _name) \
187 DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
188 #define DEFINE_RES_DMA(_dma) \
189 DEFINE_RES_DMA_NAMED((_dma), NULL)
190
191 /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
192 extern struct resource ioport_resource;
193 extern struct resource iomem_resource;
194
195 extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
196 extern int request_resource(struct resource *root, struct resource *new);
197 extern int release_resource(struct resource *new);
198 void release_child_resources(struct resource *new);
199 extern void reserve_region_with_split(struct resource *root,
200 resource_size_t start, resource_size_t end,
201 const char *name);
202 extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new);
203 extern int insert_resource(struct resource *parent, struct resource *new);
204 extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
205 extern int remove_resource(struct resource *old);
206 extern void arch_remove_reservations(struct resource *avail);
207 extern int allocate_resource(struct resource *root, struct resource *new,
208 resource_size_t size, resource_size_t min,
209 resource_size_t max, resource_size_t align,
210 resource_size_t (*alignf)(void *,
211 const struct resource *,
212 resource_size_t,
213 resource_size_t),
214 void *alignf_data);
215 struct resource *lookup_resource(struct resource *root, resource_size_t start);
216 int adjust_resource(struct resource *res, resource_size_t start,
217 resource_size_t size);
218 resource_size_t resource_alignment(struct resource *res);
resource_size(const struct resource * res)219 static inline resource_size_t resource_size(const struct resource *res)
220 {
221 return res->end - res->start + 1;
222 }
resource_type(const struct resource * res)223 static inline unsigned long resource_type(const struct resource *res)
224 {
225 return res->flags & IORESOURCE_TYPE_BITS;
226 }
resource_ext_type(const struct resource * res)227 static inline unsigned long resource_ext_type(const struct resource *res)
228 {
229 return res->flags & IORESOURCE_EXT_TYPE_BITS;
230 }
231 /* True iff r1 completely contains r2 */
resource_contains(const struct resource * r1,const struct resource * r2)232 static inline bool resource_contains(const struct resource *r1, const struct resource *r2)
233 {
234 if (resource_type(r1) != resource_type(r2))
235 return false;
236 if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
237 return false;
238 return r1->start <= r2->start && r1->end >= r2->end;
239 }
240
241 /* True if any part of r1 overlaps r2 */
resource_overlaps(const struct resource * r1,const struct resource * r2)242 static inline bool resource_overlaps(const struct resource *r1, const struct resource *r2)
243 {
244 return r1->start <= r2->end && r1->end >= r2->start;
245 }
246
resource_intersection(const struct resource * r1,const struct resource * r2,struct resource * r)247 static inline bool resource_intersection(const struct resource *r1, const struct resource *r2,
248 struct resource *r)
249 {
250 if (!resource_overlaps(r1, r2))
251 return false;
252 r->start = max(r1->start, r2->start);
253 r->end = min(r1->end, r2->end);
254 return true;
255 }
256
resource_union(const struct resource * r1,const struct resource * r2,struct resource * r)257 static inline bool resource_union(const struct resource *r1, const struct resource *r2,
258 struct resource *r)
259 {
260 if (!resource_overlaps(r1, r2))
261 return false;
262 r->start = min(r1->start, r2->start);
263 r->end = max(r1->end, r2->end);
264 return true;
265 }
266
267 /* Convenience shorthand with allocation */
268 #define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0)
269 #define request_muxed_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
270 #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
271 #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
272 #define request_mem_region_muxed(start, n, name) \
273 __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_MUXED)
274 #define request_mem_region_exclusive(start,n,name) \
275 __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
276 #define rename_region(region, newname) do { (region)->name = (newname); } while (0)
277
278 extern struct resource * __request_region(struct resource *,
279 resource_size_t start,
280 resource_size_t n,
281 const char *name, int flags);
282
283 /* Compatibility cruft */
284 #define release_region(start,n) __release_region(&ioport_resource, (start), (n))
285 #define release_mem_region(start,n) __release_region(&iomem_resource, (start), (n))
286
287 extern void __release_region(struct resource *, resource_size_t,
288 resource_size_t);
289 #ifdef CONFIG_MEMORY_HOTREMOVE
290 extern void release_mem_region_adjustable(resource_size_t, resource_size_t);
291 #endif
292 #ifdef CONFIG_MEMORY_HOTPLUG
293 extern void merge_system_ram_resource(struct resource *res);
294 #endif
295
296 /* Wrappers for managed devices */
297 struct device;
298
299 extern int devm_request_resource(struct device *dev, struct resource *root,
300 struct resource *new);
301 extern void devm_release_resource(struct device *dev, struct resource *new);
302
303 #define devm_request_region(dev,start,n,name) \
304 __devm_request_region(dev, &ioport_resource, (start), (n), (name))
305 #define devm_request_mem_region(dev,start,n,name) \
306 __devm_request_region(dev, &iomem_resource, (start), (n), (name))
307
308 extern struct resource * __devm_request_region(struct device *dev,
309 struct resource *parent, resource_size_t start,
310 resource_size_t n, const char *name);
311
312 #define devm_release_region(dev, start, n) \
313 __devm_release_region(dev, &ioport_resource, (start), (n))
314 #define devm_release_mem_region(dev, start, n) \
315 __devm_release_region(dev, &iomem_resource, (start), (n))
316
317 extern void __devm_release_region(struct device *dev, struct resource *parent,
318 resource_size_t start, resource_size_t n);
319 extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
320 extern bool iomem_is_exclusive(u64 addr);
321 extern bool resource_is_exclusive(struct resource *resource, u64 addr,
322 resource_size_t size);
323
324 extern int
325 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
326 void *arg, int (*func)(unsigned long, unsigned long, void *));
327 extern int
328 walk_mem_res(u64 start, u64 end, void *arg,
329 int (*func)(struct resource *, void *));
330 extern int
331 walk_system_ram_res(u64 start, u64 end, void *arg,
332 int (*func)(struct resource *, void *));
333 extern int
334 walk_system_ram_res_rev(u64 start, u64 end, void *arg,
335 int (*func)(struct resource *, void *));
336 extern int
337 walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
338 void *arg, int (*func)(struct resource *, void *));
339
340 struct resource *devm_request_free_mem_region(struct device *dev,
341 struct resource *base, unsigned long size);
342 struct resource *request_free_mem_region(struct resource *base,
343 unsigned long size, const char *name);
344 struct resource *alloc_free_mem_region(struct resource *base,
345 unsigned long size, unsigned long align, const char *name);
346
irqresource_disabled(struct resource * res,u32 irq)347 static inline void irqresource_disabled(struct resource *res, u32 irq)
348 {
349 res->start = irq;
350 res->end = irq;
351 res->flags |= IORESOURCE_IRQ | IORESOURCE_DISABLED | IORESOURCE_UNSET;
352 }
353
354 extern struct address_space *iomem_get_mapping(void);
355
356 #endif /* __ASSEMBLY__ */
357 #endif /* _LINUX_IOPORT_H */
358