1 /* SPDX-License-Identifier: GPL-2.0 */
3 * ioport.h Definitions of routines for detecting, reserving and
4 * allocating system resources.
6 * Authors: Linus Torvalds
9 #ifndef _LINUX_IOPORT_H
10 #define _LINUX_IOPORT_H
13 #include <linux/bits.h>
14 #include <linux/compiler.h>
15 #include <linux/minmax.h>
16 #include <linux/types.h>
18 * Resources are tree-like, allowing
22 resource_size_t start
;
27 struct resource
*parent
, *sibling
, *child
;
31 * IO resources have these defined flags.
33 * PCI devices expose these flags to userspace in the "resource" sysfs file,
36 #define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */
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
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
52 #define IORESOURCE_SIZEALIGN 0x00040000 /* size indicates alignment */
53 #define IORESOURCE_STARTALIGN 0x00080000 /* start field is alignment */
55 #define IORESOURCE_MEM_64 0x00100000
56 #define IORESOURCE_WINDOW 0x00200000 /* forwarded by bridge */
57 #define IORESOURCE_MUXED 0x00400000 /* Resource is software muxed */
59 #define IORESOURCE_EXT_TYPE_BITS 0x01000000 /* Resource extended types */
60 #define IORESOURCE_SYSRAM 0x01000000 /* System RAM (modifier) */
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. */
66 #define IORESOURCE_EXCLUSIVE 0x08000000 /* Userland may not map this resource */
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 */
73 /* I/O resource extended types */
74 #define IORESOURCE_SYSTEM_RAM (IORESOURCE_MEM|IORESOURCE_SYSRAM)
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)
84 /* PnP DMA specific bits (IORESOURCE_BITS) */
85 #define IORESOURCE_DMA_TYPE_MASK (3<<0)
86 #define IORESOURCE_DMA_8BIT (0<<0)
87 #define IORESOURCE_DMA_8AND16BIT (1<<0)
88 #define IORESOURCE_DMA_16BIT (2<<0)
90 #define IORESOURCE_DMA_MASTER (1<<2)
91 #define IORESOURCE_DMA_BYTE (1<<3)
92 #define IORESOURCE_DMA_WORD (1<<4)
94 #define IORESOURCE_DMA_SPEED_MASK (3<<6)
95 #define IORESOURCE_DMA_COMPATIBLE (0<<6)
96 #define IORESOURCE_DMA_TYPEA (1<<6)
97 #define IORESOURCE_DMA_TYPEB (2<<6)
98 #define IORESOURCE_DMA_TYPEF (3<<6)
100 /* PnP memory I/O specific bits (IORESOURCE_BITS) */
101 #define IORESOURCE_MEM_WRITEABLE (1<<0) /* dup: IORESOURCE_READONLY */
102 #define IORESOURCE_MEM_CACHEABLE (1<<1) /* dup: IORESOURCE_CACHEABLE */
103 #define IORESOURCE_MEM_RANGELENGTH (1<<2) /* dup: IORESOURCE_RANGELENGTH */
104 #define IORESOURCE_MEM_TYPE_MASK (3<<3)
105 #define IORESOURCE_MEM_8BIT (0<<3)
106 #define IORESOURCE_MEM_16BIT (1<<3)
107 #define IORESOURCE_MEM_8AND16BIT (2<<3)
108 #define IORESOURCE_MEM_32BIT (3<<3)
109 #define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */
110 #define IORESOURCE_MEM_EXPANSIONROM (1<<6)
111 #define IORESOURCE_MEM_NONPOSTED (1<<7)
113 /* PnP I/O specific bits (IORESOURCE_BITS) */
114 #define IORESOURCE_IO_16BIT_ADDR (1<<0)
115 #define IORESOURCE_IO_FIXED (1<<1)
116 #define IORESOURCE_IO_SPARSE (1<<2)
118 /* PCI ROM control bits (IORESOURCE_BITS) */
119 #define IORESOURCE_ROM_ENABLE (1<<0) /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
120 #define IORESOURCE_ROM_SHADOW (1<<1) /* Use RAM image, not ROM BAR */
122 /* PCI control bits. Shares IORESOURCE_BITS with above PCI ROM. */
123 #define IORESOURCE_PCI_FIXED (1<<4) /* Do not move resource */
124 #define IORESOURCE_PCI_EA_BEI (1<<5) /* BAR Equivalent Indicator */
127 * I/O Resource Descriptors
129 * Descriptors are used by walk_iomem_res_desc() and region_intersects()
130 * for searching a specific resource range in the iomem table. Assign
131 * a new descriptor when a resource range supports the search interfaces.
132 * Otherwise, resource.desc must be set to IORES_DESC_NONE (0).
136 IORES_DESC_CRASH_KERNEL
= 1,
137 IORES_DESC_ACPI_TABLES
= 2,
138 IORES_DESC_ACPI_NV_STORAGE
= 3,
139 IORES_DESC_PERSISTENT_MEMORY
= 4,
140 IORES_DESC_PERSISTENT_MEMORY_LEGACY
= 5,
141 IORES_DESC_DEVICE_PRIVATE_MEMORY
= 6,
142 IORES_DESC_RESERVED
= 7,
143 IORES_DESC_SOFT_RESERVED
= 8,
147 * Flags controlling ioremap() behavior.
150 IORES_MAP_SYSTEM_RAM
= BIT(0),
151 IORES_MAP_ENCRYPTED
= BIT(1),
154 /* helpers to define resources */
155 #define DEFINE_RES_NAMED(_start, _size, _name, _flags) \
158 .end = (_start) + (_size) - 1, \
161 .desc = IORES_DESC_NONE, \
164 #define DEFINE_RES_IO_NAMED(_start, _size, _name) \
165 DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
166 #define DEFINE_RES_IO(_start, _size) \
167 DEFINE_RES_IO_NAMED((_start), (_size), NULL)
169 #define DEFINE_RES_MEM_NAMED(_start, _size, _name) \
170 DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
171 #define DEFINE_RES_MEM(_start, _size) \
172 DEFINE_RES_MEM_NAMED((_start), (_size), NULL)
174 #define DEFINE_RES_IRQ_NAMED(_irq, _name) \
175 DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
176 #define DEFINE_RES_IRQ(_irq) \
177 DEFINE_RES_IRQ_NAMED((_irq), NULL)
179 #define DEFINE_RES_DMA_NAMED(_dma, _name) \
180 DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
181 #define DEFINE_RES_DMA(_dma) \
182 DEFINE_RES_DMA_NAMED((_dma), NULL)
184 /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
185 extern struct resource ioport_resource
;
186 extern struct resource iomem_resource
;
188 extern struct resource
*request_resource_conflict(struct resource
*root
, struct resource
*new);
189 extern int request_resource(struct resource
*root
, struct resource
*new);
190 extern int release_resource(struct resource
*new);
191 void release_child_resources(struct resource
*new);
192 extern void reserve_region_with_split(struct resource
*root
,
193 resource_size_t start
, resource_size_t end
,
195 extern struct resource
*insert_resource_conflict(struct resource
*parent
, struct resource
*new);
196 extern int insert_resource(struct resource
*parent
, struct resource
*new);
197 extern void insert_resource_expand_to_fit(struct resource
*root
, struct resource
*new);
198 extern int remove_resource(struct resource
*old
);
199 extern void arch_remove_reservations(struct resource
*avail
);
200 extern int allocate_resource(struct resource
*root
, struct resource
*new,
201 resource_size_t size
, resource_size_t min
,
202 resource_size_t max
, resource_size_t align
,
203 resource_size_t (*alignf
)(void *,
204 const struct resource
*,
208 struct resource
*lookup_resource(struct resource
*root
, resource_size_t start
);
209 int adjust_resource(struct resource
*res
, resource_size_t start
,
210 resource_size_t size
);
211 resource_size_t
resource_alignment(struct resource
*res
);
212 static inline resource_size_t
resource_size(const struct resource
*res
)
214 return res
->end
- res
->start
+ 1;
216 static inline unsigned long resource_type(const struct resource
*res
)
218 return res
->flags
& IORESOURCE_TYPE_BITS
;
220 static inline unsigned long resource_ext_type(const struct resource
*res
)
222 return res
->flags
& IORESOURCE_EXT_TYPE_BITS
;
224 /* True iff r1 completely contains r2 */
225 static inline bool resource_contains(struct resource
*r1
, struct resource
*r2
)
227 if (resource_type(r1
) != resource_type(r2
))
229 if (r1
->flags
& IORESOURCE_UNSET
|| r2
->flags
& IORESOURCE_UNSET
)
231 return r1
->start
<= r2
->start
&& r1
->end
>= r2
->end
;
234 /* True if any part of r1 overlaps r2 */
235 static inline bool resource_overlaps(struct resource
*r1
, struct resource
*r2
)
237 return r1
->start
<= r2
->end
&& r1
->end
>= r2
->start
;
241 resource_intersection(struct resource
*r1
, struct resource
*r2
, struct resource
*r
)
243 if (!resource_overlaps(r1
, r2
))
245 r
->start
= max(r1
->start
, r2
->start
);
246 r
->end
= min(r1
->end
, r2
->end
);
251 resource_union(struct resource
*r1
, struct resource
*r2
, struct resource
*r
)
253 if (!resource_overlaps(r1
, r2
))
255 r
->start
= min(r1
->start
, r2
->start
);
256 r
->end
= max(r1
->end
, r2
->end
);
260 /* Convenience shorthand with allocation */
261 #define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0)
262 #define request_muxed_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
263 #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
264 #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
265 #define request_mem_region_exclusive(start,n,name) \
266 __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
267 #define rename_region(region, newname) do { (region)->name = (newname); } while (0)
269 extern struct resource
* __request_region(struct resource
*,
270 resource_size_t start
,
272 const char *name
, int flags
);
274 /* Compatibility cruft */
275 #define release_region(start,n) __release_region(&ioport_resource, (start), (n))
276 #define release_mem_region(start,n) __release_region(&iomem_resource, (start), (n))
278 extern void __release_region(struct resource
*, resource_size_t
,
280 #ifdef CONFIG_MEMORY_HOTREMOVE
281 extern void release_mem_region_adjustable(resource_size_t
, resource_size_t
);
283 #ifdef CONFIG_MEMORY_HOTPLUG
284 extern void merge_system_ram_resource(struct resource
*res
);
287 /* Wrappers for managed devices */
290 extern int devm_request_resource(struct device
*dev
, struct resource
*root
,
291 struct resource
*new);
292 extern void devm_release_resource(struct device
*dev
, struct resource
*new);
294 #define devm_request_region(dev,start,n,name) \
295 __devm_request_region(dev, &ioport_resource, (start), (n), (name))
296 #define devm_request_mem_region(dev,start,n,name) \
297 __devm_request_region(dev, &iomem_resource, (start), (n), (name))
299 extern struct resource
* __devm_request_region(struct device
*dev
,
300 struct resource
*parent
, resource_size_t start
,
301 resource_size_t n
, const char *name
);
303 #define devm_release_region(dev, start, n) \
304 __devm_release_region(dev, &ioport_resource, (start), (n))
305 #define devm_release_mem_region(dev, start, n) \
306 __devm_release_region(dev, &iomem_resource, (start), (n))
308 extern void __devm_release_region(struct device
*dev
, struct resource
*parent
,
309 resource_size_t start
, resource_size_t n
);
310 extern int iomem_map_sanity_check(resource_size_t addr
, unsigned long size
);
311 extern bool iomem_is_exclusive(u64 addr
);
314 walk_system_ram_range(unsigned long start_pfn
, unsigned long nr_pages
,
315 void *arg
, int (*func
)(unsigned long, unsigned long, void *));
317 walk_mem_res(u64 start
, u64 end
, void *arg
,
318 int (*func
)(struct resource
*, void *));
320 walk_system_ram_res(u64 start
, u64 end
, void *arg
,
321 int (*func
)(struct resource
*, void *));
323 walk_iomem_res_desc(unsigned long desc
, unsigned long flags
, u64 start
, u64 end
,
324 void *arg
, int (*func
)(struct resource
*, void *));
326 struct resource
*devm_request_free_mem_region(struct device
*dev
,
327 struct resource
*base
, unsigned long size
);
328 struct resource
*request_free_mem_region(struct resource
*base
,
329 unsigned long size
, const char *name
);
331 static inline void irqresource_disabled(struct resource
*res
, u32 irq
)
335 res
->flags
|= IORESOURCE_IRQ
| IORESOURCE_DISABLED
| IORESOURCE_UNSET
;
338 extern struct address_space
*iomem_get_mapping(void);
340 #endif /* __ASSEMBLY__ */
341 #endif /* _LINUX_IOPORT_H */