include/linux/ioport.h

   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
  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)
  89
  90 #define IORESOURCE_DMA_MASTER           (1<<2)
  91 #define IORESOURCE_DMA_BYTE             (1<<3)
  92 #define IORESOURCE_DMA_WORD             (1<<4)
  93
  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)
  99
 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)
 112
 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)
 117
 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 */
 121
 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 */
 125
 126 /*
 127  * I/O Resource Descriptors
 128  *
 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).
 133  */
 134 enum {
 135         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,
 144 };
 145
 146 /*
 147  * Flags controlling ioremap() behavior.
 148  */
 149 enum {
 150         IORES_MAP_SYSTEM_RAM            = BIT(0),
 151         IORES_MAP_ENCRYPTED             = BIT(1),
 152 };
 153
 154 /* helpers to define resources */
 155 #define DEFINE_RES_NAMED(_start, _size, _name, _flags)                  \
 156         {                                                               \
 157                 .start = (_start),                                      \
 158                 .end = (_start) + (_size) - 1,                          \
 159                 .name = (_name),                                        \
 160                 .flags = (_flags),                                      \
 161                 .desc = IORES_DESC_NONE,                                \
 162         }
 163
 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)
 168
 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)
 173
 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)
 178
 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)
 183
 184 /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
 185 extern struct resource ioport_resource;
 186 extern struct resource iomem_resource;
 187
 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,
 194                              const char *name);
 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 *,
 205                                                        resource_size_t,
 206                                                        resource_size_t),
 207                              void *alignf_data);
 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)
 213 {
 214         return res->end - res->start + 1;
 215 }
 216 static inline unsigned long resource_type(const struct resource *res)
 217 {
 218         return res->flags & IORESOURCE_TYPE_BITS;
 219 }
 220 static inline unsigned long resource_ext_type(const struct resource *res)
 221 {
 222         return res->flags & IORESOURCE_EXT_TYPE_BITS;
 223 }
 224 /* True iff r1 completely contains r2 */
 225 static inline bool resource_contains(struct resource *r1, struct resource *r2)
 226 {
 227         if (resource_type(r1) != resource_type(r2))
 228                 return false;
 229         if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
 230                 return false;
 231         return r1->start <= r2->start && r1->end >= r2->end;
 232 }
 233
 234 /* True if any part of r1 overlaps r2 */
 235 static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
 236 {
 237        return r1->start <= r2->end && r1->end >= r2->start;
 238 }
 239
 240 static inline bool
 241 resource_intersection(struct resource *r1, struct resource *r2, struct resource *r)
 242 {
 243         if (!resource_overlaps(r1, r2))
 244                 return false;
 245         r->start = max(r1->start, r2->start);
 246         r->end = min(r1->end, r2->end);
 247         return true;
 248 }
 249
 250 static inline bool
 251 resource_union(struct resource *r1, struct resource *r2, struct resource *r)
 252 {
 253         if (!resource_overlaps(r1, r2))
 254                 return false;
 255         r->start = min(r1->start, r2->start);
 256         r->end = max(r1->end, r2->end);
 257         return true;
 258 }
 259
 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)
 268
 269 extern struct resource * __request_region(struct resource *,
 270                                         resource_size_t start,
 271                                         resource_size_t n,
 272                                         const char *name, int flags);
 273
 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))
 277
 278 extern void __release_region(struct resource *, resource_size_t,
 279                                 resource_size_t);
 280 #ifdef CONFIG_MEMORY_HOTREMOVE
 281 extern void release_mem_region_adjustable(resource_size_t, resource_size_t);
 282 #endif
 283 #ifdef CONFIG_MEMORY_HOTPLUG
 284 extern void merge_system_ram_resource(struct resource *res);
 285 #endif
 286
 287 /* Wrappers for managed devices */
 288 struct device;
 289
 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);
 293
 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))
 298
 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);
 302
 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))
 307
 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);
 312
 313 extern int
 314 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 315                 void *arg, int (*func)(unsigned long, unsigned long, void *));
 316 extern int
 317 walk_mem_res(u64 start, u64 end, void *arg,
 318              int (*func)(struct resource *, void *));
 319 extern int
 320 walk_system_ram_res(u64 start, u64 end, void *arg,
 321                     int (*func)(struct resource *, void *));
 322 extern int
 323 walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
 324                     void *arg, int (*func)(struct resource *, void *));
 325
 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);
 330
 331 static inline void irqresource_disabled(struct resource *res, u32 irq)
 332 {
 333         res->start = irq;
 334         res->end = irq;
 335         res->flags |= IORESOURCE_IRQ | IORESOURCE_DISABLED | IORESOURCE_UNSET;
 336 }
 337
 338 extern struct address_space *iomem_get_mapping(void);
 339
 340 #endif /* __ASSEMBLY__ */
 341 #endif  /* _LINUX_IOPORT_H */