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  */
  18 struct 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 struct 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 */
 110 extern struct resource ioport_resource;
 111 extern struct resource iomem_resource;
 112
 113 extern int request_resource(struct resource *root, struct resource *new);
 114 extern int release_resource(struct resource *new);
 115 extern void reserve_region_with_split(struct resource *root,
 116                              resource_size_t start, resource_size_t end,
 117                              const char *name);
 118 extern int insert_resource(struct resource *parent, struct resource *new);
 119 extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
 120 extern 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);
 126 int adjust_resource(struct resource *res, resource_size_t start,
 127                     resource_size_t size);
 128 resource_size_t resource_alignment(struct resource *res);
 129 static inline resource_size_t resource_size(const struct resource *res)
 130 {
 131         return res->end - res->start + 1;
 132 }
 133 static inline unsigned long resource_type(const 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
 146 extern 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
 156 extern int __check_region(struct resource *, resource_size_t, resource_size_t);
 157 extern void __release_region(struct resource *, resource_size_t,
 158                                 resource_size_t);
 159
 160 static 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 */
 167 struct 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
 173 extern 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
 182 extern void __devm_release_region(struct device *dev, struct resource *parent,
 183                                   resource_size_t start, resource_size_t n);
 184 extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
 185 extern int iomem_is_exclusive(u64 addr);
 186
 187 extern int
 188 walk_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 */