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TOMOYO Linux Cross Reference
Linux/include/linux/ioport.h

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  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);
196 static inline resource_size_t resource_size(const struct resource *res)
197 {
198         return res->end - res->start + 1;
199 }
200 static inline unsigned long resource_type(const struct resource *res)
201 {
202         return res->flags & IORESOURCE_TYPE_BITS;
203 }
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 */
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 */
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 

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