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