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/rh_kabi.h>
  16#include <linux/bits.h>
  17
  18/*
  19 * Resources are tree-like, allowing
  20 * nesting etc..
  21 */
  22struct resource {
  23        resource_size_t start;
  24        resource_size_t end;
  25        const char *name;
  26        unsigned long flags;
  27        unsigned long desc;
  28        struct resource *parent, *sibling, *child;
  29        RH_KABI_RESERVE(1)
  30        RH_KABI_RESERVE(2)
  31        RH_KABI_RESERVE(3)
  32        RH_KABI_RESERVE(4)
  33};
  34
  35/*
  36 * IO resources have these defined flags.
  37 *
  38 * PCI devices expose these flags to userspace in the "resource" sysfs file,
  39 * so don't move them.
  40 */
  41#define IORESOURCE_BITS         0x000000ff      /* Bus-specific bits */
  42
  43#define IORESOURCE_TYPE_BITS    0x00001f00      /* Resource type */
  44#define IORESOURCE_IO           0x00000100      /* PCI/ISA I/O ports */
  45#define IORESOURCE_MEM          0x00000200
  46#define IORESOURCE_REG          0x00000300      /* Register offsets */
  47#define IORESOURCE_IRQ          0x00000400
  48#define IORESOURCE_DMA          0x00000800
  49#define IORESOURCE_BUS          0x00001000
  50
  51#define IORESOURCE_PREFETCH     0x00002000      /* No side effects */
  52#define IORESOURCE_READONLY     0x00004000
  53#define IORESOURCE_CACHEABLE    0x00008000
  54#define IORESOURCE_RANGELENGTH  0x00010000
  55#define IORESOURCE_SHADOWABLE   0x00020000
  56
  57#define IORESOURCE_SIZEALIGN    0x00040000      /* size indicates alignment */
  58#define IORESOURCE_STARTALIGN   0x00080000      /* start field is alignment */
  59
  60#define IORESOURCE_MEM_64       0x00100000
  61#define IORESOURCE_WINDOW       0x00200000      /* forwarded by bridge */
  62#define IORESOURCE_MUXED        0x00400000      /* Resource is software muxed */
  63
  64#define IORESOURCE_EXT_TYPE_BITS 0x01000000     /* Resource extended types */
  65#define IORESOURCE_SYSRAM       0x01000000      /* System RAM (modifier) */
  66
  67#define IORESOURCE_EXCLUSIVE    0x08000000      /* Userland may not map this resource */
  68
  69#define IORESOURCE_DISABLED     0x10000000
  70#define IORESOURCE_UNSET        0x20000000      /* No address assigned yet */
  71#define IORESOURCE_AUTO         0x40000000
  72#define IORESOURCE_BUSY         0x80000000      /* Driver has marked this resource busy */
  73
  74/* I/O resource extended types */
  75#define IORESOURCE_SYSTEM_RAM           (IORESOURCE_MEM|IORESOURCE_SYSRAM)
  76
  77/* PnP IRQ specific bits (IORESOURCE_BITS) */
  78#define IORESOURCE_IRQ_HIGHEDGE         (1<<0)
  79#define IORESOURCE_IRQ_LOWEDGE          (1<<1)
  80#define IORESOURCE_IRQ_HIGHLEVEL        (1<<2)
  81#define IORESOURCE_IRQ_LOWLEVEL         (1<<3)
  82#define IORESOURCE_IRQ_SHAREABLE        (1<<4)
  83#define IORESOURCE_IRQ_OPTIONAL         (1<<5)
  84
  85/* PnP DMA specific bits (IORESOURCE_BITS) */
  86#define IORESOURCE_DMA_TYPE_MASK        (3<<0)
  87#define IORESOURCE_DMA_8BIT             (0<<0)
  88#define IORESOURCE_DMA_8AND16BIT        (1<<0)
  89#define IORESOURCE_DMA_16BIT            (2<<0)
  90
  91#define IORESOURCE_DMA_MASTER           (1<<2)
  92#define IORESOURCE_DMA_BYTE             (1<<3)
  93#define IORESOURCE_DMA_WORD             (1<<4)
  94
  95#define IORESOURCE_DMA_SPEED_MASK       (3<<6)
  96#define IORESOURCE_DMA_COMPATIBLE       (0<<6)
  97#define IORESOURCE_DMA_TYPEA            (1<<6)
  98#define IORESOURCE_DMA_TYPEB            (2<<6)
  99#define IORESOURCE_DMA_TYPEF            (3<<6)
 100
 101/* PnP memory I/O specific bits (IORESOURCE_BITS) */
 102#define IORESOURCE_MEM_WRITEABLE        (1<<0)  /* dup: IORESOURCE_READONLY */
 103#define IORESOURCE_MEM_CACHEABLE        (1<<1)  /* dup: IORESOURCE_CACHEABLE */
 104#define IORESOURCE_MEM_RANGELENGTH      (1<<2)  /* dup: IORESOURCE_RANGELENGTH */
 105#define IORESOURCE_MEM_TYPE_MASK        (3<<3)
 106#define IORESOURCE_MEM_8BIT             (0<<3)
 107#define IORESOURCE_MEM_16BIT            (1<<3)
 108#define IORESOURCE_MEM_8AND16BIT        (2<<3)
 109#define IORESOURCE_MEM_32BIT            (3<<3)
 110#define IORESOURCE_MEM_SHADOWABLE       (1<<5)  /* dup: IORESOURCE_SHADOWABLE */
 111#define IORESOURCE_MEM_EXPANSIONROM     (1<<6)
 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 */
 134enum {
 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_DEVICE_PUBLIC_MEMORY         = 7,
 143        IORES_DESC_RESERVED                     = 8,
 144};
 145
 146/*
 147 * Flags controlling ioremap() behavior.
 148 */
 149enum {
 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 */
 185extern struct resource ioport_resource;
 186extern struct resource iomem_resource;
 187
 188extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
 189extern int request_resource(struct resource *root, struct resource *new);
 190extern int release_resource(struct resource *new);
 191void release_child_resources(struct resource *new);
 192extern void reserve_region_with_split(struct resource *root,
 193                             resource_size_t start, resource_size_t end,
 194                             const char *name);
 195extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new);
 196extern int insert_resource(struct resource *parent, struct resource *new);
 197extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
 198extern int remove_resource(struct resource *old);
 199extern void arch_remove_reservations(struct resource *avail);
 200extern 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);
 208struct resource *lookup_resource(struct resource *root, resource_size_t start);
 209int adjust_resource(struct resource *res, resource_size_t start,
 210                    resource_size_t size);
 211resource_size_t resource_alignment(struct resource *res);
 212static inline resource_size_t resource_size(const struct resource *res)
 213{
 214        return res->end - res->start + 1;
 215}
 216static inline unsigned long resource_type(const struct resource *res)
 217{
 218        return res->flags & IORESOURCE_TYPE_BITS;
 219}
 220static 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 */
 225static 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
 235/* Convenience shorthand with allocation */
 236#define request_region(start,n,name)            __request_region(&ioport_resource, (start), (n), (name), 0)
 237#define request_muxed_region(start,n,name)      __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
 238#define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
 239#define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
 240#define request_mem_region_exclusive(start,n,name) \
 241        __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
 242#define rename_region(region, newname) do { (region)->name = (newname); } while (0)
 243
 244extern struct resource * __request_region(struct resource *,
 245                                        resource_size_t start,
 246                                        resource_size_t n,
 247                                        const char *name, int flags);
 248
 249/* Compatibility cruft */
 250#define release_region(start,n) __release_region(&ioport_resource, (start), (n))
 251#define release_mem_region(start,n)     __release_region(&iomem_resource, (start), (n))
 252
 253extern void __release_region(struct resource *, resource_size_t,
 254                                resource_size_t);
 255#ifdef CONFIG_MEMORY_HOTREMOVE
 256extern int release_mem_region_adjustable(struct resource *, resource_size_t,
 257                                resource_size_t);
 258#endif
 259
 260/* Wrappers for managed devices */
 261struct device;
 262
 263extern int devm_request_resource(struct device *dev, struct resource *root,
 264                                 struct resource *new);
 265extern void devm_release_resource(struct device *dev, struct resource *new);
 266
 267#define devm_request_region(dev,start,n,name) \
 268        __devm_request_region(dev, &ioport_resource, (start), (n), (name))
 269#define devm_request_mem_region(dev,start,n,name) \
 270        __devm_request_region(dev, &iomem_resource, (start), (n), (name))
 271
 272extern struct resource * __devm_request_region(struct device *dev,
 273                                struct resource *parent, resource_size_t start,
 274                                resource_size_t n, const char *name);
 275
 276#define devm_release_region(dev, start, n) \
 277        __devm_release_region(dev, &ioport_resource, (start), (n))
 278#define devm_release_mem_region(dev, start, n) \
 279        __devm_release_region(dev, &iomem_resource, (start), (n))
 280
 281extern void __devm_release_region(struct device *dev, struct resource *parent,
 282                                  resource_size_t start, resource_size_t n);
 283extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
 284extern bool iomem_is_exclusive(u64 addr);
 285
 286extern int
 287walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 288                void *arg, int (*func)(unsigned long, unsigned long, void *));
 289extern int
 290walk_mem_res(u64 start, u64 end, void *arg,
 291             int (*func)(struct resource *, void *));
 292extern int
 293walk_system_ram_res(u64 start, u64 end, void *arg,
 294                    int (*func)(struct resource *, void *));
 295extern int
 296walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
 297                    void *arg, int (*func)(struct resource *, void *));
 298
 299/* True if any part of r1 overlaps r2 */
 300static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
 301{
 302       return (r1->start <= r2->end && r1->end >= r2->start);
 303}
 304
 305
 306#endif /* __ASSEMBLY__ */
 307#endif  /* _LINUX_IOPORT_H */
 308
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