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