include/linux/ioport.h

   1 /*
   2  * ioport.h     Definitions of routines for detecting, reserving and
   3  *              allocating system resources.
   4  *
   5  * Authors:     Linus Torvalds
   6  */
   7
   8 #ifndef _LINUX_IOPORT_H
   9 #define _LINUX_IOPORT_H
  10
  11 #ifndef __ASSEMBLY__
  12 #include <linux/compiler.h>
  13 #include <linux/types.h>
  14 /*
  15  * Resources are tree-like, allowing
  16  * nesting etc..
  17  */
  18 struct resource {
  19         resource_size_t start;
  20         resource_size_t end;
  21         const char *name;
  22         unsigned long flags;
  23         unsigned long desc;
  24         struct resource *parent, *sibling, *child;
  25 };
  26
  27 /*
  28  * IO resources have these defined flags.
  29  */
  30 #define IORESOURCE_BITS         0x000000ff      /* Bus-specific bits */
  31
  32 #define IORESOURCE_TYPE_BITS    0x00001f00      /* Resource type */
  33 #define IORESOURCE_IO           0x00000100      /* PCI/ISA I/O ports */
  34 #define IORESOURCE_MEM          0x00000200
  35 #define IORESOURCE_REG          0x00000300      /* Register offsets */
  36 #define IORESOURCE_IRQ          0x00000400
  37 #define IORESOURCE_DMA          0x00000800
  38 #define IORESOURCE_BUS          0x00001000
  39
  40 #define IORESOURCE_PREFETCH     0x00002000      /* No side effects */
  41 #define IORESOURCE_READONLY     0x00004000
  42 #define IORESOURCE_CACHEABLE    0x00008000
  43 #define IORESOURCE_RANGELENGTH  0x00010000
  44 #define IORESOURCE_SHADOWABLE   0x00020000
  45
  46 #define IORESOURCE_SIZEALIGN    0x00040000      /* size indicates alignment */
  47 #define IORESOURCE_STARTALIGN   0x00080000      /* start field is alignment */
  48
  49 #define IORESOURCE_MEM_64       0x00100000
  50 #define IORESOURCE_WINDOW       0x00200000      /* forwarded by bridge */
  51 #define IORESOURCE_MUXED        0x00400000      /* Resource is software muxed */
  52
  53 #define IORESOURCE_EXT_TYPE_BITS 0x01000000     /* Resource extended types */
  54 #define IORESOURCE_SYSRAM       0x01000000      /* System RAM (modifier) */
  55
  56 #define IORESOURCE_EXCLUSIVE    0x08000000      /* Userland may not map this resource */
  57
  58 #define IORESOURCE_DISABLED     0x10000000
  59 #define IORESOURCE_UNSET        0x20000000      /* No address assigned yet */
  60 #define IORESOURCE_AUTO         0x40000000
  61 #define IORESOURCE_BUSY         0x80000000      /* Driver has marked this resource busy */
  62
  63 /* I/O resource extended types */
  64 #define IORESOURCE_SYSTEM_RAM           (IORESOURCE_MEM|IORESOURCE_SYSRAM)
  65
  66 /* PnP IRQ specific bits (IORESOURCE_BITS) */
  67 #define IORESOURCE_IRQ_HIGHEDGE         (1<<0)
  68 #define IORESOURCE_IRQ_LOWEDGE          (1<<1)
  69 #define IORESOURCE_IRQ_HIGHLEVEL        (1<<2)
  70 #define IORESOURCE_IRQ_LOWLEVEL         (1<<3)
  71 #define IORESOURCE_IRQ_SHAREABLE        (1<<4)
  72 #define IORESOURCE_IRQ_OPTIONAL         (1<<5)
  73
  74 /* PnP DMA specific bits (IORESOURCE_BITS) */
  75 #define IORESOURCE_DMA_TYPE_MASK        (3<<0)
  76 #define IORESOURCE_DMA_8BIT             (0<<0)
  77 #define IORESOURCE_DMA_8AND16BIT        (1<<0)
  78 #define IORESOURCE_DMA_16BIT            (2<<0)
  79
  80 #define IORESOURCE_DMA_MASTER           (1<<2)
  81 #define IORESOURCE_DMA_BYTE             (1<<3)
  82 #define IORESOURCE_DMA_WORD             (1<<4)
  83
  84 #define IORESOURCE_DMA_SPEED_MASK       (3<<6)
  85 #define IORESOURCE_DMA_COMPATIBLE       (0<<6)
  86 #define IORESOURCE_DMA_TYPEA            (1<<6)
  87 #define IORESOURCE_DMA_TYPEB            (2<<6)
  88 #define IORESOURCE_DMA_TYPEF            (3<<6)
  89
  90 /* PnP memory I/O specific bits (IORESOURCE_BITS) */
  91 #define IORESOURCE_MEM_WRITEABLE        (1<<0)  /* dup: IORESOURCE_READONLY */
  92 #define IORESOURCE_MEM_CACHEABLE        (1<<1)  /* dup: IORESOURCE_CACHEABLE */
  93 #define IORESOURCE_MEM_RANGELENGTH      (1<<2)  /* dup: IORESOURCE_RANGELENGTH */
  94 #define IORESOURCE_MEM_TYPE_MASK        (3<<3)
  95 #define IORESOURCE_MEM_8BIT             (0<<3)
  96 #define IORESOURCE_MEM_16BIT            (1<<3)
  97 #define IORESOURCE_MEM_8AND16BIT        (2<<3)
  98 #define IORESOURCE_MEM_32BIT            (3<<3)
  99 #define IORESOURCE_MEM_SHADOWABLE       (1<<5)  /* dup: IORESOURCE_SHADOWABLE */
 100 #define IORESOURCE_MEM_EXPANSIONROM     (1<<6)
 101
 102 /* PnP I/O specific bits (IORESOURCE_BITS) */
 103 #define IORESOURCE_IO_16BIT_ADDR        (1<<0)
 104 #define IORESOURCE_IO_FIXED             (1<<1)
 105 #define IORESOURCE_IO_SPARSE            (1<<2)
 106
 107 /* PCI ROM control bits (IORESOURCE_BITS) */
 108 #define IORESOURCE_ROM_ENABLE           (1<<0)  /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
 109 #define IORESOURCE_ROM_SHADOW           (1<<1)  /* Use RAM image, not ROM BAR */
 110
 111 /* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
 112 #define IORESOURCE_PCI_FIXED            (1<<4)  /* Do not move resource */
 113
 114 /*
 115  * I/O Resource Descriptors
 116  *
 117  * Descriptors are used by walk_iomem_res_desc() and region_intersects()
 118  * for searching a specific resource range in the iomem table.  Assign
 119  * a new descriptor when a resource range supports the search interfaces.
 120  * Otherwise, resource.desc must be set to IORES_DESC_NONE (0).
 121  */
 122 enum {
 123         IORES_DESC_NONE                         = 0,
 124         IORES_DESC_CRASH_KERNEL                 = 1,
 125         IORES_DESC_ACPI_TABLES                  = 2,
 126         IORES_DESC_ACPI_NV_STORAGE              = 3,
 127         IORES_DESC_PERSISTENT_MEMORY            = 4,
 128         IORES_DESC_PERSISTENT_MEMORY_LEGACY     = 5,
 129 };
 130
 131 /* helpers to define resources */
 132 #define DEFINE_RES_NAMED(_start, _size, _name, _flags)                  \
 133         {                                                               \
 134                 .start = (_start),                                      \
 135                 .end = (_start) + (_size) - 1,                          \
 136                 .name = (_name),                                        \
 137                 .flags = (_flags),                                      \
 138                 .desc = IORES_DESC_NONE,                                \
 139         }
 140
 141 #define DEFINE_RES_IO_NAMED(_start, _size, _name)                       \
 142         DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
 143 #define DEFINE_RES_IO(_start, _size)                                    \
 144         DEFINE_RES_IO_NAMED((_start), (_size), NULL)
 145
 146 #define DEFINE_RES_MEM_NAMED(_start, _size, _name)                      \
 147         DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
 148 #define DEFINE_RES_MEM(_start, _size)                                   \
 149         DEFINE_RES_MEM_NAMED((_start), (_size), NULL)
 150
 151 #define DEFINE_RES_IRQ_NAMED(_irq, _name)                               \
 152         DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
 153 #define DEFINE_RES_IRQ(_irq)                                            \
 154         DEFINE_RES_IRQ_NAMED((_irq), NULL)
 155
 156 #define DEFINE_RES_DMA_NAMED(_dma, _name)                               \
 157         DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
 158 #define DEFINE_RES_DMA(_dma)                                            \
 159         DEFINE_RES_DMA_NAMED((_dma), NULL)
 160
 161 /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
 162 extern struct resource ioport_resource;
 163 extern struct resource iomem_resource;
 164
 165 extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
 166 extern int request_resource(struct resource *root, struct resource *new);
 167 extern int release_resource(struct resource *new);
 168 void release_child_resources(struct resource *new);
 169 extern void reserve_region_with_split(struct resource *root,
 170                              resource_size_t start, resource_size_t end,
 171                              const char *name);
 172 extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new);
 173 extern int insert_resource(struct resource *parent, struct resource *new);
 174 extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
 175 extern int remove_resource(struct resource *old);
 176 extern void arch_remove_reservations(struct resource *avail);
 177 extern int allocate_resource(struct resource *root, struct resource *new,
 178                              resource_size_t size, resource_size_t min,
 179                              resource_size_t max, resource_size_t align,
 180                              resource_size_t (*alignf)(void *,
 181                                                        const struct resource *,
 182                                                        resource_size_t,
 183                                                        resource_size_t),
 184                              void *alignf_data);
 185 struct resource *lookup_resource(struct resource *root, resource_size_t start);
 186 int adjust_resource(struct resource *res, resource_size_t start,
 187                     resource_size_t size);
 188 resource_size_t resource_alignment(struct resource *res);
 189 static inline resource_size_t resource_size(const struct resource *res)
 190 {
 191         return res->end - res->start + 1;
 192 }
 193 static inline unsigned long resource_type(const struct resource *res)
 194 {
 195         return res->flags & IORESOURCE_TYPE_BITS;
 196 }
 197 static inline unsigned long resource_ext_type(const struct resource *res)
 198 {
 199         return res->flags & IORESOURCE_EXT_TYPE_BITS;
 200 }
 201 /* True iff r1 completely contains r2 */
 202 static inline bool resource_contains(struct resource *r1, struct resource *r2)
 203 {
 204         if (resource_type(r1) != resource_type(r2))
 205                 return false;
 206         if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
 207                 return false;
 208         return r1->start <= r2->start && r1->end >= r2->end;
 209 }
 210
 211
 212 /* Convenience shorthand with allocation */
 213 #define request_region(start,n,name)            __request_region(&ioport_resource, (start), (n), (name), 0)
 214 #define request_muxed_region(start,n,name)      __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
 215 #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
 216 #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
 217 #define request_mem_region_exclusive(start,n,name) \
 218         __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
 219 #define rename_region(region, newname) do { (region)->name = (newname); } while (0)
 220
 221 extern struct resource * __request_region(struct resource *,
 222                                         resource_size_t start,
 223                                         resource_size_t n,
 224                                         const char *name, int flags);
 225
 226 /* Compatibility cruft */
 227 #define release_region(start,n) __release_region(&ioport_resource, (start), (n))
 228 #define release_mem_region(start,n)     __release_region(&iomem_resource, (start), (n))
 229
 230 extern void __release_region(struct resource *, resource_size_t,
 231                                 resource_size_t);
 232 #ifdef CONFIG_MEMORY_HOTREMOVE
 233 extern int release_mem_region_adjustable(struct resource *, resource_size_t,
 234                                 resource_size_t);
 235 #endif
 236
 237 /* Wrappers for managed devices */
 238 struct device;
 239
 240 extern int devm_request_resource(struct device *dev, struct resource *root,
 241                                  struct resource *new);
 242 extern void devm_release_resource(struct device *dev, struct resource *new);
 243
 244 #define devm_request_region(dev,start,n,name) \
 245         __devm_request_region(dev, &ioport_resource, (start), (n), (name))
 246 #define devm_request_mem_region(dev,start,n,name) \
 247         __devm_request_region(dev, &iomem_resource, (start), (n), (name))
 248
 249 extern struct resource * __devm_request_region(struct device *dev,
 250                                 struct resource *parent, resource_size_t start,
 251                                 resource_size_t n, const char *name);
 252
 253 #define devm_release_region(dev, start, n) \
 254         __devm_release_region(dev, &ioport_resource, (start), (n))
 255 #define devm_release_mem_region(dev, start, n) \
 256         __devm_release_region(dev, &iomem_resource, (start), (n))
 257
 258 extern void __devm_release_region(struct device *dev, struct resource *parent,
 259                                   resource_size_t start, resource_size_t n);
 260 extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
 261 extern int iomem_is_exclusive(u64 addr);
 262
 263 extern int
 264 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 265                 void *arg, int (*func)(unsigned long, unsigned long, void *));
 266 extern int
 267 walk_system_ram_res(u64 start, u64 end, void *arg,
 268                     int (*func)(u64, u64, void *));
 269 extern int
 270 walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
 271                     void *arg, int (*func)(u64, u64, void *));
 272
 273 /* True if any part of r1 overlaps r2 */
 274 static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
 275 {
 276        return (r1->start <= r2->end && r1->end >= r2->start);
 277 }
 278
 279
 280 #endif /* __ASSEMBLY__ */
 281 #endif  /* _LINUX_IOPORT_H */