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
  26struct resource_list {
  27        struct resource_list *next;
  28        struct resource *res;
  29        struct pci_dev *dev;
  30};
  31
  32/*
  33 * IO resources have these defined flags.
  34 */
  35#define IORESOURCE_BITS         0x000000ff      /* Bus-specific bits */
  36
  37#define IORESOURCE_TYPE_BITS    0x00000f00      /* Resource type */
  38#define IORESOURCE_IO           0x00000100
  39#define IORESOURCE_MEM          0x00000200
  40#define IORESOURCE_IRQ          0x00000400
  41#define IORESOURCE_DMA          0x00000800
  42
  43#define IORESOURCE_PREFETCH     0x00001000      /* No side effects */
  44#define IORESOURCE_READONLY     0x00002000
  45#define IORESOURCE_CACHEABLE    0x00004000
  46#define IORESOURCE_RANGELENGTH  0x00008000
  47#define IORESOURCE_SHADOWABLE   0x00010000
  48
  49#define IORESOURCE_SIZEALIGN    0x00020000      /* size indicates alignment */
  50#define IORESOURCE_STARTALIGN   0x00040000      /* start field is alignment */
  51
  52#define IORESOURCE_MEM_64       0x00100000
  53
  54#define IORESOURCE_EXCLUSIVE    0x08000000      /* Userland may not map this resource */
  55#define IORESOURCE_DISABLED     0x10000000
  56#define IORESOURCE_UNSET        0x20000000
  57#define IORESOURCE_AUTO         0x40000000
  58#define IORESOURCE_BUSY         0x80000000      /* Driver has marked this resource busy */
  59
  60/* PnP IRQ specific bits (IORESOURCE_BITS) */
  61#define IORESOURCE_IRQ_HIGHEDGE         (1<<0)
  62#define IORESOURCE_IRQ_LOWEDGE          (1<<1)
  63#define IORESOURCE_IRQ_HIGHLEVEL        (1<<2)
  64#define IORESOURCE_IRQ_LOWLEVEL         (1<<3)
  65#define IORESOURCE_IRQ_SHAREABLE        (1<<4)
  66#define IORESOURCE_IRQ_OPTIONAL         (1<<5)
  67
  68/* PnP DMA specific bits (IORESOURCE_BITS) */
  69#define IORESOURCE_DMA_TYPE_MASK        (3<<0)
  70#define IORESOURCE_DMA_8BIT             (0<<0)
  71#define IORESOURCE_DMA_8AND16BIT        (1<<0)
  72#define IORESOURCE_DMA_16BIT            (2<<0)
  73
  74#define IORESOURCE_DMA_MASTER           (1<<2)
  75#define IORESOURCE_DMA_BYTE             (1<<3)
  76#define IORESOURCE_DMA_WORD             (1<<4)
  77
  78#define IORESOURCE_DMA_SPEED_MASK       (3<<6)
  79#define IORESOURCE_DMA_COMPATIBLE       (0<<6)
  80#define IORESOURCE_DMA_TYPEA            (1<<6)
  81#define IORESOURCE_DMA_TYPEB            (2<<6)
  82#define IORESOURCE_DMA_TYPEF            (3<<6)
  83
  84/* PnP memory I/O specific bits (IORESOURCE_BITS) */
  85#define IORESOURCE_MEM_WRITEABLE        (1<<0)  /* dup: IORESOURCE_READONLY */
  86#define IORESOURCE_MEM_CACHEABLE        (1<<1)  /* dup: IORESOURCE_CACHEABLE */
  87#define IORESOURCE_MEM_RANGELENGTH      (1<<2)  /* dup: IORESOURCE_RANGELENGTH */
  88#define IORESOURCE_MEM_TYPE_MASK        (3<<3)
  89#define IORESOURCE_MEM_8BIT             (0<<3)
  90#define IORESOURCE_MEM_16BIT            (1<<3)
  91#define IORESOURCE_MEM_8AND16BIT        (2<<3)
  92#define IORESOURCE_MEM_32BIT            (3<<3)
  93#define IORESOURCE_MEM_SHADOWABLE       (1<<5)  /* dup: IORESOURCE_SHADOWABLE */
  94#define IORESOURCE_MEM_EXPANSIONROM     (1<<6)
  95
  96/* PnP I/O specific bits (IORESOURCE_BITS) */
  97#define IORESOURCE_IO_16BIT_ADDR        (1<<0)
  98#define IORESOURCE_IO_FIXED             (1<<1)
  99
 100/* PCI ROM control bits (IORESOURCE_BITS) */
 101#define IORESOURCE_ROM_ENABLE           (1<<0)  /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
 102#define IORESOURCE_ROM_SHADOW           (1<<1)  /* ROM is copy at C000:0 */
 103#define IORESOURCE_ROM_COPY             (1<<2)  /* ROM is alloc'd copy, resource field overlaid */
 104#define IORESOURCE_ROM_BIOS_COPY        (1<<3)  /* ROM is BIOS copy, resource field overlaid */
 105
 106/* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
 107#define IORESOURCE_PCI_FIXED            (1<<4)  /* Do not move resource */
 108
 109/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
 110extern struct resource ioport_resource;
 111extern struct resource iomem_resource;
 112
 113extern int request_resource(struct resource *root, struct resource *new);
 114extern int release_resource(struct resource *new);
 115extern void reserve_region_with_split(struct resource *root,
 116                             resource_size_t start, resource_size_t end,
 117                             const char *name);
 118extern int insert_resource(struct resource *parent, struct resource *new);
 119extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
 120extern int allocate_resource(struct resource *root, struct resource *new,
 121                             resource_size_t size, resource_size_t min,
 122                             resource_size_t max, resource_size_t align,
 123                             void (*alignf)(void *, struct resource *,
 124                                            resource_size_t, resource_size_t),
 125                             void *alignf_data);
 126int adjust_resource(struct resource *res, resource_size_t start,
 127                    resource_size_t size);
 128resource_size_t resource_alignment(struct resource *res);
 129static inline resource_size_t resource_size(struct resource *res)
 130{
 131        return res->end - res->start + 1;
 132}
 133static inline unsigned long resource_type(struct resource *res)
 134{
 135        return res->flags & IORESOURCE_TYPE_BITS;
 136}
 137
 138/* Convenience shorthand with allocation */
 139#define request_region(start,n,name)    __request_region(&ioport_resource, (start), (n), (name), 0)
 140#define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
 141#define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
 142#define request_mem_region_exclusive(start,n,name) \
 143        __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
 144#define rename_region(region, newname) do { (region)->name = (newname); } while (0)
 145
 146extern struct resource * __request_region(struct resource *,
 147                                        resource_size_t start,
 148                                        resource_size_t n,
 149                                        const char *name, int flags);
 150
 151/* Compatibility cruft */
 152#define release_region(start,n) __release_region(&ioport_resource, (start), (n))
 153#define check_mem_region(start,n)       __check_region(&iomem_resource, (start), (n))
 154#define release_mem_region(start,n)     __release_region(&iomem_resource, (start), (n))
 155
 156extern int __check_region(struct resource *, resource_size_t, resource_size_t);
 157extern void __release_region(struct resource *, resource_size_t,
 158                                resource_size_t);
 159
 160static inline int __deprecated check_region(resource_size_t s,
 161                                                resource_size_t n)
 162{
 163        return __check_region(&ioport_resource, s, n);
 164}
 165
 166/* Wrappers for managed devices */
 167struct device;
 168#define devm_request_region(dev,start,n,name) \
 169        __devm_request_region(dev, &ioport_resource, (start), (n), (name))
 170#define devm_request_mem_region(dev,start,n,name) \
 171        __devm_request_region(dev, &iomem_resource, (start), (n), (name))
 172
 173extern struct resource * __devm_request_region(struct device *dev,
 174                                struct resource *parent, resource_size_t start,
 175                                resource_size_t n, const char *name);
 176
 177#define devm_release_region(dev, start, n) \
 178        __devm_release_region(dev, &ioport_resource, (start), (n))
 179#define devm_release_mem_region(dev, start, n) \
 180        __devm_release_region(dev, &iomem_resource, (start), (n))
 181
 182extern void __devm_release_region(struct device *dev, struct resource *parent,
 183                                  resource_size_t start, resource_size_t n);
 184extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
 185extern int iomem_is_exclusive(u64 addr);
 186
 187extern int
 188walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 189                void *arg, int (*func)(unsigned long, unsigned long, void *));
 190
 191#endif /* __ASSEMBLY__ */
 192#endif  /* _LINUX_IOPORT_H */
 193