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#include <linux/bits.h>
  16/*
  17 * Resources are tree-like, allowing
  18 * nesting etc..
  19 */
  20struct 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
 107/* PnP I/O specific bits (IORESOURCE_BITS) */
 108#define IORESOURCE_IO_16BIT_ADDR        (1<<0)
 109#define IORESOURCE_IO_FIXED             (1<<1)
 110#define IORESOURCE_IO_SPARSE            (1<<2)
 111
 112/* PCI ROM control bits (IORESOURCE_BITS) */
 113#define IORESOURCE_ROM_ENABLE           (1<<0)  /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
 114#define IORESOURCE_ROM_SHADOW           (1<<1)  /* Use RAM image, not ROM BAR */
 115
 116/* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
 117#define IORESOURCE_PCI_FIXED            (1<<4)  /* Do not move resource */
 118#define IORESOURCE_PCI_EA_BEI           (1<<5)  /* BAR Equivalent Indicator */
 119
 120/*
 121 * I/O Resource Descriptors
 122 *
 123 * Descriptors are used by walk_iomem_res_desc() and region_intersects()
 124 * for searching a specific resource range in the iomem table.  Assign
 125 * a new descriptor when a resource range supports the search interfaces.
 126 * Otherwise, resource.desc must be set to IORES_DESC_NONE (0).
 127 */
 128enum {
 129        IORES_DESC_NONE                         = 0,
 130        IORES_DESC_CRASH_KERNEL                 = 1,
 131        IORES_DESC_ACPI_TABLES                  = 2,
 132        IORES_DESC_ACPI_NV_STORAGE              = 3,
 133        IORES_DESC_PERSISTENT_MEMORY            = 4,
 134        IORES_DESC_PERSISTENT_MEMORY_LEGACY     = 5,
 135        IORES_DESC_DEVICE_PRIVATE_MEMORY        = 6,
 136        IORES_DESC_RESERVED                     = 7,
 137};
 138
 139/*
 140 * Flags controlling ioremap() behavior.
 141 */
 142enum {
 143        IORES_MAP_SYSTEM_RAM            = BIT(0),
 144        IORES_MAP_ENCRYPTED             = BIT(1),
 145};
 146
 147/* helpers to define resources */
 148#define DEFINE_RES_NAMED(_start, _size, _name, _flags)                  \
 149        {                                                               \
 150                .start = (_start),                                      \
 151                .end = (_start) + (_size) - 1,                          \
 152                .name = (_name),                                        \
 153                .flags = (_flags),                                      \
 154                .desc = IORES_DESC_NONE,                                \
 155        }
 156
 157#define DEFINE_RES_IO_NAMED(_start, _size, _name)                       \
 158        DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
 159#define DEFINE_RES_IO(_start, _size)                                    \
 160        DEFINE_RES_IO_NAMED((_start), (_size), NULL)
 161
 162#define DEFINE_RES_MEM_NAMED(_start, _size, _name)                      \
 163        DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
 164#define DEFINE_RES_MEM(_start, _size)                                   \
 165        DEFINE_RES_MEM_NAMED((_start), (_size), NULL)
 166
 167#define DEFINE_RES_IRQ_NAMED(_irq, _name)                               \
 168        DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
 169#define DEFINE_RES_IRQ(_irq)                                            \
 170        DEFINE_RES_IRQ_NAMED((_irq), NULL)
 171
 172#define DEFINE_RES_DMA_NAMED(_dma, _name)                               \
 173        DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
 174#define DEFINE_RES_DMA(_dma)                                            \
 175        DEFINE_RES_DMA_NAMED((_dma), NULL)
 176
 177/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
 178extern struct resource ioport_resource;
 179extern struct resource iomem_resource;
 180
 181extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
 182extern int request_resource(struct resource *root, struct resource *new);
 183extern int release_resource(struct resource *new);
 184void release_child_resources(struct resource *new);
 185extern void reserve_region_with_split(struct resource *root,
 186                             resource_size_t start, resource_size_t end,
 187                             const char *name);
 188extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new);
 189extern int insert_resource(struct resource *parent, struct resource *new);
 190extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
 191extern int remove_resource(struct resource *old);
 192extern void arch_remove_reservations(struct resource *avail);
 193extern int allocate_resource(struct resource *root, struct resource *new,
 194                             resource_size_t size, resource_size_t min,
 195                             resource_size_t max, resource_size_t align,
 196                             resource_size_t (*alignf)(void *,
 197                                                       const struct resource *,
 198                                                       resource_size_t,
 199                                                       resource_size_t),
 200                             void *alignf_data);
 201struct resource *lookup_resource(struct resource *root, resource_size_t start);
 202int adjust_resource(struct resource *res, resource_size_t start,
 203                    resource_size_t size);
 204resource_size_t resource_alignment(struct resource *res);
 205static inline resource_size_t resource_size(const struct resource *res)
 206{
 207        return res->end - res->start + 1;
 208}
 209static inline unsigned long resource_type(const struct resource *res)
 210{
 211        return res->flags & IORESOURCE_TYPE_BITS;
 212}
 213static inline unsigned long resource_ext_type(const struct resource *res)
 214{
 215        return res->flags & IORESOURCE_EXT_TYPE_BITS;
 216}
 217/* True iff r1 completely contains r2 */
 218static inline bool resource_contains(struct resource *r1, struct resource *r2)
 219{
 220        if (resource_type(r1) != resource_type(r2))
 221                return false;
 222        if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
 223                return false;
 224        return r1->start <= r2->start && r1->end >= r2->end;
 225}
 226
 227
 228/* Convenience shorthand with allocation */
 229#define request_region(start,n,name)            __request_region(&ioport_resource, (start), (n), (name), 0)
 230#define request_muxed_region(start,n,name)      __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
 231#define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
 232#define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
 233#define request_mem_region_exclusive(start,n,name) \
 234        __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
 235#define rename_region(region, newname) do { (region)->name = (newname); } while (0)
 236
 237extern struct resource * __request_region(struct resource *,
 238                                        resource_size_t start,
 239                                        resource_size_t n,
 240                                        const char *name, int flags);
 241
 242/* Compatibility cruft */
 243#define release_region(start,n) __release_region(&ioport_resource, (start), (n))
 244#define release_mem_region(start,n)     __release_region(&iomem_resource, (start), (n))
 245
 246extern void __release_region(struct resource *, resource_size_t,
 247                                resource_size_t);
 248#ifdef CONFIG_MEMORY_HOTREMOVE
 249extern int release_mem_region_adjustable(struct resource *, resource_size_t,
 250                                resource_size_t);
 251#endif
 252
 253/* Wrappers for managed devices */
 254struct device;
 255
 256extern int devm_request_resource(struct device *dev, struct resource *root,
 257                                 struct resource *new);
 258extern void devm_release_resource(struct device *dev, struct resource *new);
 259
 260#define devm_request_region(dev,start,n,name) \
 261        __devm_request_region(dev, &ioport_resource, (start), (n), (name))
 262#define devm_request_mem_region(dev,start,n,name) \
 263        __devm_request_region(dev, &iomem_resource, (start), (n), (name))
 264
 265extern struct resource * __devm_request_region(struct device *dev,
 266                                struct resource *parent, resource_size_t start,
 267                                resource_size_t n, const char *name);
 268
 269#define devm_release_region(dev, start, n) \
 270        __devm_release_region(dev, &ioport_resource, (start), (n))
 271#define devm_release_mem_region(dev, start, n) \
 272        __devm_release_region(dev, &iomem_resource, (start), (n))
 273
 274extern void __devm_release_region(struct device *dev, struct resource *parent,
 275                                  resource_size_t start, resource_size_t n);
 276extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
 277extern bool iomem_is_exclusive(u64 addr);
 278
 279extern int
 280walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 281                void *arg, int (*func)(unsigned long, unsigned long, void *));
 282extern int
 283walk_mem_res(u64 start, u64 end, void *arg,
 284             int (*func)(struct resource *, void *));
 285extern int
 286walk_system_ram_res(u64 start, u64 end, void *arg,
 287                    int (*func)(struct resource *, void *));
 288extern int
 289walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
 290                    void *arg, int (*func)(struct resource *, void *));
 291
 292/* True if any part of r1 overlaps r2 */
 293static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
 294{
 295       return (r1->start <= r2->end && r1->end >= r2->start);
 296}
 297
 298struct resource *devm_request_free_mem_region(struct device *dev,
 299                struct resource *base, unsigned long size);
 300
 301#endif /* __ASSEMBLY__ */
 302#endif  /* _LINUX_IOPORT_H */
 303
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