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    0x00001f00      /* Resource type */
  38 #define IORESOURCE_IO           0x00000100
  39 #define IORESOURCE_MEM          0x00000200
  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
  56 #define IORESOURCE_EXCLUSIVE    0x08000000      /* Userland may not map this resource */
  57 #define IORESOURCE_DISABLED     0x10000000
  58 #define IORESOURCE_UNSET        0x20000000
  59 #define IORESOURCE_AUTO         0x40000000
  60 #define IORESOURCE_BUSY         0x80000000      /* Driver has marked this resource busy */
  61
  62 /* PnP IRQ specific bits (IORESOURCE_BITS) */
  63 #define IORESOURCE_IRQ_HIGHEDGE         (1<<0)
  64 #define IORESOURCE_IRQ_LOWEDGE          (1<<1)
  65 #define IORESOURCE_IRQ_HIGHLEVEL        (1<<2)
  66 #define IORESOURCE_IRQ_LOWLEVEL         (1<<3)
  67 #define IORESOURCE_IRQ_SHAREABLE        (1<<4)
  68 #define IORESOURCE_IRQ_OPTIONAL         (1<<5)
  69
  70 /* PnP DMA specific bits (IORESOURCE_BITS) */
  71 #define IORESOURCE_DMA_TYPE_MASK        (3<<0)
  72 #define IORESOURCE_DMA_8BIT             (0<<0)
  73 #define IORESOURCE_DMA_8AND16BIT        (1<<0)
  74 #define IORESOURCE_DMA_16BIT            (2<<0)
  75
  76 #define IORESOURCE_DMA_MASTER           (1<<2)
  77 #define IORESOURCE_DMA_BYTE             (1<<3)
  78 #define IORESOURCE_DMA_WORD             (1<<4)
  79
  80 #define IORESOURCE_DMA_SPEED_MASK       (3<<6)
  81 #define IORESOURCE_DMA_COMPATIBLE       (0<<6)
  82 #define IORESOURCE_DMA_TYPEA            (1<<6)
  83 #define IORESOURCE_DMA_TYPEB            (2<<6)
  84 #define IORESOURCE_DMA_TYPEF            (3<<6)
  85
  86 /* PnP memory I/O specific bits (IORESOURCE_BITS) */
  87 #define IORESOURCE_MEM_WRITEABLE        (1<<0)  /* dup: IORESOURCE_READONLY */
  88 #define IORESOURCE_MEM_CACHEABLE        (1<<1)  /* dup: IORESOURCE_CACHEABLE */
  89 #define IORESOURCE_MEM_RANGELENGTH      (1<<2)  /* dup: IORESOURCE_RANGELENGTH */
  90 #define IORESOURCE_MEM_TYPE_MASK        (3<<3)
  91 #define IORESOURCE_MEM_8BIT             (0<<3)
  92 #define IORESOURCE_MEM_16BIT            (1<<3)
  93 #define IORESOURCE_MEM_8AND16BIT        (2<<3)
  94 #define IORESOURCE_MEM_32BIT            (3<<3)
  95 #define IORESOURCE_MEM_SHADOWABLE       (1<<5)  /* dup: IORESOURCE_SHADOWABLE */
  96 #define IORESOURCE_MEM_EXPANSIONROM     (1<<6)
  97
  98 /* PnP I/O specific bits (IORESOURCE_BITS) */
  99 #define IORESOURCE_IO_16BIT_ADDR        (1<<0)
 100 #define IORESOURCE_IO_FIXED             (1<<1)
 101
 102 /* PCI ROM control bits (IORESOURCE_BITS) */
 103 #define IORESOURCE_ROM_ENABLE           (1<<0)  /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
 104 #define IORESOURCE_ROM_SHADOW           (1<<1)  /* ROM is copy at C000:0 */
 105 #define IORESOURCE_ROM_COPY             (1<<2)  /* ROM is alloc'd copy, resource field overlaid */
 106 #define IORESOURCE_ROM_BIOS_COPY        (1<<3)  /* ROM is BIOS copy, resource field overlaid */
 107
 108 /* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
 109 #define IORESOURCE_PCI_FIXED            (1<<4)  /* Do not move resource */
 110
 111 /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
 112 extern struct resource ioport_resource;
 113 extern struct resource iomem_resource;
 114
 115 extern int request_resource(struct resource *root, struct resource *new);
 116 extern int release_resource(struct resource *new);
 117 void release_child_resources(struct resource *new);
 118 extern void reserve_region_with_split(struct resource *root,
 119                              resource_size_t start, resource_size_t end,
 120                              const char *name);
 121 extern int insert_resource(struct resource *parent, struct resource *new);
 122 extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
 123 extern int allocate_resource(struct resource *root, struct resource *new,
 124                              resource_size_t size, resource_size_t min,
 125                              resource_size_t max, resource_size_t align,
 126                              resource_size_t (*alignf)(void *,
 127                                                        const struct resource *,
 128                                                        resource_size_t,
 129                                                        resource_size_t),
 130                              void *alignf_data);
 131 int adjust_resource(struct resource *res, resource_size_t start,
 132                     resource_size_t size);
 133 resource_size_t resource_alignment(struct resource *res);
 134 static inline resource_size_t resource_size(const struct resource *res)
 135 {
 136         return res->end - res->start + 1;
 137 }
 138 static inline unsigned long resource_type(const struct resource *res)
 139 {
 140         return res->flags & IORESOURCE_TYPE_BITS;
 141 }
 142
 143 /* Convenience shorthand with allocation */
 144 #define request_region(start,n,name)    __request_region(&ioport_resource, (start), (n), (name), 0)
 145 #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
 146 #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
 147 #define request_mem_region_exclusive(start,n,name) \
 148         __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
 149 #define rename_region(region, newname) do { (region)->name = (newname); } while (0)
 150
 151 extern struct resource * __request_region(struct resource *,
 152                                         resource_size_t start,
 153                                         resource_size_t n,
 154                                         const char *name, int flags);
 155
 156 /* Compatibility cruft */
 157 #define release_region(start,n) __release_region(&ioport_resource, (start), (n))
 158 #define check_mem_region(start,n)       __check_region(&iomem_resource, (start), (n))
 159 #define release_mem_region(start,n)     __release_region(&iomem_resource, (start), (n))
 160
 161 extern int __check_region(struct resource *, resource_size_t, resource_size_t);
 162 extern void __release_region(struct resource *, resource_size_t,
 163                                 resource_size_t);
 164
 165 static inline int __deprecated check_region(resource_size_t s,
 166                                                 resource_size_t n)
 167 {
 168         return __check_region(&ioport_resource, s, n);
 169 }
 170
 171 /* Wrappers for managed devices */
 172 struct device;
 173 #define devm_request_region(dev,start,n,name) \
 174         __devm_request_region(dev, &ioport_resource, (start), (n), (name))
 175 #define devm_request_mem_region(dev,start,n,name) \
 176         __devm_request_region(dev, &iomem_resource, (start), (n), (name))
 177
 178 extern struct resource * __devm_request_region(struct device *dev,
 179                                 struct resource *parent, resource_size_t start,
 180                                 resource_size_t n, const char *name);
 181
 182 #define devm_release_region(dev, start, n) \
 183         __devm_release_region(dev, &ioport_resource, (start), (n))
 184 #define devm_release_mem_region(dev, start, n) \
 185         __devm_release_region(dev, &iomem_resource, (start), (n))
 186
 187 extern void __devm_release_region(struct device *dev, struct resource *parent,
 188                                   resource_size_t start, resource_size_t n);
 189 extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
 190 extern int iomem_is_exclusive(u64 addr);
 191
 192 extern int
 193 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 194                 void *arg, int (*func)(unsigned long, unsigned long, void *));
 195
 196 #endif /* __ASSEMBLY__ */
 197 #endif  /* _LINUX_IOPORT_H */