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