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