LXR linux/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 */
  18struct resource {
  19        resource_size_t start;
  20        resource_size_t end;
  21        const char *name;
  22        unsigned long flags;
  23        struct resource *parent, *sibling, *child;
  24};
  25
  26/*
  27 * IO resources have these defined flags.
  28 */
  29#define IORESOURCE_BITS         0x000000ff      /* Bus-specific bits */
  30
  31#define IORESOURCE_TYPE_BITS    0x00001f00      /* Resource type */
  32#define IORESOURCE_IO           0x00000100      /* PCI/ISA I/O ports */
  33#define IORESOURCE_MEM          0x00000200
  34#define IORESOURCE_REG          0x00000300      /* Register offsets */
  35#define IORESOURCE_IRQ          0x00000400
  36#define IORESOURCE_DMA          0x00000800
  37#define IORESOURCE_BUS          0x00001000
  38
  39#define IORESOURCE_PREFETCH     0x00002000      /* No side effects */
  40#define IORESOURCE_READONLY     0x00004000
  41#define IORESOURCE_CACHEABLE    0x00008000
  42#define IORESOURCE_RANGELENGTH  0x00010000
  43#define IORESOURCE_SHADOWABLE   0x00020000
  44
  45#define IORESOURCE_SIZEALIGN    0x00040000      /* size indicates alignment */
  46#define IORESOURCE_STARTALIGN   0x00080000      /* start field is alignment */
  47
  48#define IORESOURCE_MEM_64       0x00100000
  49#define IORESOURCE_WINDOW       0x00200000      /* forwarded by bridge */
  50#define IORESOURCE_MUXED        0x00400000      /* Resource is software muxed */
  51
  52#define IORESOURCE_EXCLUSIVE    0x08000000      /* Userland may not map this resource */
  53#define IORESOURCE_DISABLED     0x10000000
  54#define IORESOURCE_UNSET        0x20000000      /* No address assigned yet */
  55#define IORESOURCE_AUTO         0x40000000
  56#define IORESOURCE_BUSY         0x80000000      /* Driver has marked this resource busy */
  57
  58/* PnP IRQ specific bits (IORESOURCE_BITS) */
  59#define IORESOURCE_IRQ_HIGHEDGE         (1<<0)
  60#define IORESOURCE_IRQ_LOWEDGE          (1<<1)
  61#define IORESOURCE_IRQ_HIGHLEVEL        (1<<2)
  62#define IORESOURCE_IRQ_LOWLEVEL         (1<<3)
  63#define IORESOURCE_IRQ_SHAREABLE        (1<<4)
  64#define IORESOURCE_IRQ_OPTIONAL         (1<<5)
  65
  66/* PnP DMA specific bits (IORESOURCE_BITS) */
  67#define IORESOURCE_DMA_TYPE_MASK        (3<<0)
  68#define IORESOURCE_DMA_8BIT             (0<<0)
  69#define IORESOURCE_DMA_8AND16BIT        (1<<0)
  70#define IORESOURCE_DMA_16BIT            (2<<0)
  71
  72#define IORESOURCE_DMA_MASTER           (1<<2)
  73#define IORESOURCE_DMA_BYTE             (1<<3)
  74#define IORESOURCE_DMA_WORD             (1<<4)
  75
  76#define IORESOURCE_DMA_SPEED_MASK       (3<<6)
  77#define IORESOURCE_DMA_COMPATIBLE       (0<<6)
  78#define IORESOURCE_DMA_TYPEA            (1<<6)
  79#define IORESOURCE_DMA_TYPEB            (2<<6)
  80#define IORESOURCE_DMA_TYPEF            (3<<6)
  81
  82/* PnP memory I/O specific bits (IORESOURCE_BITS) */
  83#define IORESOURCE_MEM_WRITEABLE        (1<<0)  /* dup: IORESOURCE_READONLY */
  84#define IORESOURCE_MEM_CACHEABLE        (1<<1)  /* dup: IORESOURCE_CACHEABLE */
  85#define IORESOURCE_MEM_RANGELENGTH      (1<<2)  /* dup: IORESOURCE_RANGELENGTH */
  86#define IORESOURCE_MEM_TYPE_MASK        (3<<3)
  87#define IORESOURCE_MEM_8BIT             (0<<3)
  88#define IORESOURCE_MEM_16BIT            (1<<3)
  89#define IORESOURCE_MEM_8AND16BIT        (2<<3)
  90#define IORESOURCE_MEM_32BIT            (3<<3)
  91#define IORESOURCE_MEM_SHADOWABLE       (1<<5)  /* dup: IORESOURCE_SHADOWABLE */
  92#define IORESOURCE_MEM_EXPANSIONROM     (1<<6)
  93
  94/* PnP I/O specific bits (IORESOURCE_BITS) */
  95#define IORESOURCE_IO_16BIT_ADDR        (1<<0)
  96#define IORESOURCE_IO_FIXED             (1<<1)
  97#define IORESOURCE_IO_SPARSE            (1<<2)
  98
  99/* PCI ROM control bits (IORESOURCE_BITS) */
 100#define IORESOURCE_ROM_ENABLE           (1<<0)  /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
 101#define IORESOURCE_ROM_SHADOW           (1<<1)  /* ROM is copy at C000:0 */
 102#define IORESOURCE_ROM_COPY             (1<<2)  /* ROM is alloc'd copy, resource field overlaid */
 103#define IORESOURCE_ROM_BIOS_COPY        (1<<3)  /* ROM is BIOS copy, resource field overlaid */
 104
 105/* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
 106#define IORESOURCE_PCI_FIXED            (1<<4)  /* Do not move resource */
 107
 108
 109/* helpers to define resources */
 110#define DEFINE_RES_NAMED(_start, _size, _name, _flags)                  \
 111        {                                                               \
 112                .start = (_start),                                      \
 113                .end = (_start) + (_size) - 1,                          \
 114                .name = (_name),                                        \
 115                .flags = (_flags),                                      \
 116        }
 117
 118#define DEFINE_RES_IO_NAMED(_start, _size, _name)                       \
 119        DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
 120#define DEFINE_RES_IO(_start, _size)                                    \
 121        DEFINE_RES_IO_NAMED((_start), (_size), NULL)
 122
 123#define DEFINE_RES_MEM_NAMED(_start, _size, _name)                      \
 124        DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
 125#define DEFINE_RES_MEM(_start, _size)                                   \
 126        DEFINE_RES_MEM_NAMED((_start), (_size), NULL)
 127
 128#define DEFINE_RES_IRQ_NAMED(_irq, _name)                               \
 129        DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
 130#define DEFINE_RES_IRQ(_irq)                                            \
 131        DEFINE_RES_IRQ_NAMED((_irq), NULL)
 132
 133#define DEFINE_RES_DMA_NAMED(_dma, _name)                               \
 134        DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
 135#define DEFINE_RES_DMA(_dma)                                            \
 136        DEFINE_RES_DMA_NAMED((_dma), NULL)
 137
 138/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
 139extern struct resource ioport_resource;
 140extern struct resource iomem_resource;
 141
 142extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
 143extern int request_resource(struct resource *root, struct resource *new);
 144extern int release_resource(struct resource *new);
 145void release_child_resources(struct resource *new);
 146extern void reserve_region_with_split(struct resource *root,
 147                             resource_size_t start, resource_size_t end,
 148                             const char *name);
 149extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new);
 150extern int insert_resource(struct resource *parent, struct resource *new);
 151extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
 152extern void arch_remove_reservations(struct resource *avail);
 153extern int allocate_resource(struct resource *root, struct resource *new,
 154                             resource_size_t size, resource_size_t min,
 155                             resource_size_t max, resource_size_t align,
 156                             resource_size_t (*alignf)(void *,
 157                                                       const struct resource *,
 158                                                       resource_size_t,
 159                                                       resource_size_t),
 160                             void *alignf_data);
 161struct resource *lookup_resource(struct resource *root, resource_size_t start);
 162int adjust_resource(struct resource *res, resource_size_t start,
 163                    resource_size_t size);
 164resource_size_t resource_alignment(struct resource *res);
 165static inline resource_size_t resource_size(const struct resource *res)
 166{
 167        return res->end - res->start + 1;
 168}
 169static inline unsigned long resource_type(const struct resource *res)
 170{
 171        return res->flags & IORESOURCE_TYPE_BITS;
 172}
 173/* True iff r1 completely contains r2 */
 174static inline bool resource_contains(struct resource *r1, struct resource *r2)
 175{
 176        if (resource_type(r1) != resource_type(r2))
 177                return false;
 178        if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
 179                return false;
 180        return r1->start <= r2->start && r1->end >= r2->end;
 181}
 182
 183
 184/* Convenience shorthand with allocation */
 185#define request_region(start,n,name)            __request_region(&ioport_resource, (start), (n), (name), 0)
 186#define request_muxed_region(start,n,name)      __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
 187#define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
 188#define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
 189#define request_mem_region_exclusive(start,n,name) \
 190        __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
 191#define rename_region(region, newname) do { (region)->name = (newname); } while (0)
 192
 193extern struct resource * __request_region(struct resource *,
 194                                        resource_size_t start,
 195                                        resource_size_t n,
 196                                        const char *name, int flags);
 197
 198/* Compatibility cruft */
 199#define release_region(start,n) __release_region(&ioport_resource, (start), (n))
 200#define release_mem_region(start,n)     __release_region(&iomem_resource, (start), (n))
 201
 202extern void __release_region(struct resource *, resource_size_t,
 203                                resource_size_t);
 204#ifdef CONFIG_MEMORY_HOTREMOVE
 205extern int release_mem_region_adjustable(struct resource *, resource_size_t,
 206                                resource_size_t);
 207#endif
 208
 209/* Wrappers for managed devices */
 210struct device;
 211
 212extern int devm_request_resource(struct device *dev, struct resource *root,
 213                                 struct resource *new);
 214extern void devm_release_resource(struct device *dev, struct resource *new);
 215
 216#define devm_request_region(dev,start,n,name) \
 217        __devm_request_region(dev, &ioport_resource, (start), (n), (name))
 218#define devm_request_mem_region(dev,start,n,name) \
 219        __devm_request_region(dev, &iomem_resource, (start), (n), (name))
 220
 221extern struct resource * __devm_request_region(struct device *dev,
 222                                struct resource *parent, resource_size_t start,
 223                                resource_size_t n, const char *name);
 224
 225#define devm_release_region(dev, start, n) \
 226        __devm_release_region(dev, &ioport_resource, (start), (n))
 227#define devm_release_mem_region(dev, start, n) \
 228        __devm_release_region(dev, &iomem_resource, (start), (n))
 229
 230extern void __devm_release_region(struct device *dev, struct resource *parent,
 231                                  resource_size_t start, resource_size_t n);
 232extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
 233extern int iomem_is_exclusive(u64 addr);
 234
 235extern int
 236walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 237                void *arg, int (*func)(unsigned long, unsigned long, void *));
 238extern int
 239walk_system_ram_res(u64 start, u64 end, void *arg,
 240                    int (*func)(u64, u64, void *));
 241extern int
 242walk_iomem_res(char *name, unsigned long flags, u64 start, u64 end, void *arg,
 243               int (*func)(u64, u64, void *));
 244
 245/* True if any part of r1 overlaps r2 */
 246static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
 247{
 248       return (r1->start <= r2->end && r1->end >= r2->start);
 249}
 250
 251
 252#endif /* __ASSEMBLY__ */
 253#endif  /* _LINUX_IOPORT_H */
 254