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_IO           0x00000100      /* Resource type */
  38#define IORESOURCE_MEM          0x00000200
  39#define IORESOURCE_IRQ          0x00000400
  40#define IORESOURCE_DMA          0x00000800
  41
  42#define IORESOURCE_PREFETCH     0x00001000      /* No side effects */
  43#define IORESOURCE_READONLY     0x00002000
  44#define IORESOURCE_CACHEABLE    0x00004000
  45#define IORESOURCE_RANGELENGTH  0x00008000
  46#define IORESOURCE_SHADOWABLE   0x00010000
  47
  48#define IORESOURCE_SIZEALIGN    0x00020000      /* size indicates alignment */
  49#define IORESOURCE_STARTALIGN   0x00040000      /* start field is alignment */
  50
  51#define IORESOURCE_DISABLED     0x10000000
  52#define IORESOURCE_UNSET        0x20000000
  53#define IORESOURCE_AUTO         0x40000000
  54#define IORESOURCE_BUSY         0x80000000      /* Driver has marked this resource busy */
  55
  56/* PnP IRQ specific bits (IORESOURCE_BITS) */
  57#define IORESOURCE_IRQ_HIGHEDGE         (1<<0)
  58#define IORESOURCE_IRQ_LOWEDGE          (1<<1)
  59#define IORESOURCE_IRQ_HIGHLEVEL        (1<<2)
  60#define IORESOURCE_IRQ_LOWLEVEL         (1<<3)
  61#define IORESOURCE_IRQ_SHAREABLE        (1<<4)
  62
  63/* PnP DMA specific bits (IORESOURCE_BITS) */
  64#define IORESOURCE_DMA_TYPE_MASK        (3<<0)
  65#define IORESOURCE_DMA_8BIT             (0<<0)
  66#define IORESOURCE_DMA_8AND16BIT        (1<<0)
  67#define IORESOURCE_DMA_16BIT            (2<<0)
  68
  69#define IORESOURCE_DMA_MASTER           (1<<2)
  70#define IORESOURCE_DMA_BYTE             (1<<3)
  71#define IORESOURCE_DMA_WORD             (1<<4)
  72
  73#define IORESOURCE_DMA_SPEED_MASK       (3<<6)
  74#define IORESOURCE_DMA_COMPATIBLE       (0<<6)
  75#define IORESOURCE_DMA_TYPEA            (1<<6)
  76#define IORESOURCE_DMA_TYPEB            (2<<6)
  77#define IORESOURCE_DMA_TYPEF            (3<<6)
  78
  79/* PnP memory I/O specific bits (IORESOURCE_BITS) */
  80#define IORESOURCE_MEM_WRITEABLE        (1<<0)  /* dup: IORESOURCE_READONLY */
  81#define IORESOURCE_MEM_CACHEABLE        (1<<1)  /* dup: IORESOURCE_CACHEABLE */
  82#define IORESOURCE_MEM_RANGELENGTH      (1<<2)  /* dup: IORESOURCE_RANGELENGTH */
  83#define IORESOURCE_MEM_TYPE_MASK        (3<<3)
  84#define IORESOURCE_MEM_8BIT             (0<<3)
  85#define IORESOURCE_MEM_16BIT            (1<<3)
  86#define IORESOURCE_MEM_8AND16BIT        (2<<3)
  87#define IORESOURCE_MEM_32BIT            (3<<3)
  88#define IORESOURCE_MEM_SHADOWABLE       (1<<5)  /* dup: IORESOURCE_SHADOWABLE */
  89#define IORESOURCE_MEM_EXPANSIONROM     (1<<6)
  90
  91/* PCI ROM control bits (IORESOURCE_BITS) */
  92#define IORESOURCE_ROM_ENABLE           (1<<0)  /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
  93#define IORESOURCE_ROM_SHADOW           (1<<1)  /* ROM is copy at C000:0 */
  94#define IORESOURCE_ROM_COPY             (1<<2)  /* ROM is alloc'd copy, resource field overlaid */
  95#define IORESOURCE_ROM_BIOS_COPY        (1<<3)  /* ROM is BIOS copy, resource field overlaid */
  96
  97/* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
  98#define IORESOURCE_PCI_FIXED            (1<<4)  /* Do not move resource */
  99
 100/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
 101extern struct resource ioport_resource;
 102extern struct resource iomem_resource;
 103
 104extern int request_resource(struct resource *root, struct resource *new);
 105extern int release_resource(struct resource *new);
 106extern int insert_resource(struct resource *parent, struct resource *new);
 107extern int allocate_resource(struct resource *root, struct resource *new,
 108                             resource_size_t size, resource_size_t min,
 109                             resource_size_t max, resource_size_t align,
 110                             void (*alignf)(void *, struct resource *,
 111                                            resource_size_t, resource_size_t),
 112                             void *alignf_data);
 113int adjust_resource(struct resource *res, resource_size_t start,
 114                    resource_size_t size);
 115resource_size_t resource_alignment(struct resource *res);
 116
 117/* Convenience shorthand with allocation */
 118#define request_region(start,n,name)    __request_region(&ioport_resource, (start), (n), (name))
 119#define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name))
 120#define rename_region(region, newname) do { (region)->name = (newname); } while (0)
 121
 122extern struct resource * __request_region(struct resource *,
 123                                        resource_size_t start,
 124                                        resource_size_t n, const char *name);
 125
 126/* Compatibility cruft */
 127#define release_region(start,n) __release_region(&ioport_resource, (start), (n))
 128#define check_mem_region(start,n)       __check_region(&iomem_resource, (start), (n))
 129#define release_mem_region(start,n)     __release_region(&iomem_resource, (start), (n))
 130
 131extern int __check_region(struct resource *, resource_size_t, resource_size_t);
 132extern void __release_region(struct resource *, resource_size_t,
 133                                resource_size_t);
 134
 135static inline int __deprecated check_region(resource_size_t s,
 136                                                resource_size_t n)
 137{
 138        return __check_region(&ioport_resource, s, n);
 139}
 140
 141/* Wrappers for managed devices */
 142struct device;
 143#define devm_request_region(dev,start,n,name) \
 144        __devm_request_region(dev, &ioport_resource, (start), (n), (name))
 145#define devm_request_mem_region(dev,start,n,name) \
 146        __devm_request_region(dev, &iomem_resource, (start), (n), (name))
 147
 148extern struct resource * __devm_request_region(struct device *dev,
 149                                struct resource *parent, resource_size_t start,
 150                                resource_size_t n, const char *name);
 151
 152#define devm_release_region(start,n) \
 153        __devm_release_region(dev, &ioport_resource, (start), (n))
 154#define devm_release_mem_region(start,n) \
 155        __devm_release_region(dev, &iomem_resource, (start), (n))
 156
 157extern void __devm_release_region(struct device *dev, struct resource *parent,
 158                                  resource_size_t start, resource_size_t n);
 159
 160#endif /* __ASSEMBLY__ */
 161#endif  /* _LINUX_IOPORT_H */
 162