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 /*
  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
  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
  98 /* PCI ROM control bits (IORESOURCE_BITS) */
  99 #define IORESOURCE_ROM_ENABLE           (1<<0)  /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
 100 #define IORESOURCE_ROM_SHADOW           (1<<1)  /* ROM is copy at C000:0 */
 101 #define IORESOURCE_ROM_COPY             (1<<2)  /* ROM is alloc'd copy, resource field overlaid */
 102 #define IORESOURCE_ROM_BIOS_COPY        (1<<3)  /* ROM is BIOS copy, resource field overlaid */
 103
 104 /* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
 105 #define IORESOURCE_PCI_FIXED            (1<<4)  /* Do not move resource */
 106
 107
 108 /* helpers to define resources */
 109 #define DEFINE_RES_NAMED(_start, _size, _name, _flags)                  \
 110         {                                                               \
 111                 .start = (_start),                                      \
 112                 .end = (_start) + (_size) - 1,                          \
 113                 .name = (_name),                                        \
 114                 .flags = (_flags),                                      \
 115         }
 116
 117 #define DEFINE_RES_IO_NAMED(_start, _size, _name)                       \
 118         DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
 119 #define DEFINE_RES_IO(_start, _size)                                    \
 120         DEFINE_RES_IO_NAMED((_start), (_size), NULL)
 121
 122 #define DEFINE_RES_MEM_NAMED(_start, _size, _name)                      \
 123         DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
 124 #define DEFINE_RES_MEM(_start, _size)                                   \
 125         DEFINE_RES_MEM_NAMED((_start), (_size), NULL)
 126
 127 #define DEFINE_RES_IRQ_NAMED(_irq, _name)                               \
 128         DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
 129 #define DEFINE_RES_IRQ(_irq)                                            \
 130         DEFINE_RES_IRQ_NAMED((_irq), NULL)
 131
 132 #define DEFINE_RES_DMA_NAMED(_dma, _name)                               \
 133         DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
 134 #define DEFINE_RES_DMA(_dma)                                            \
 135         DEFINE_RES_DMA_NAMED((_dma), NULL)
 136
 137 /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
 138 extern struct resource ioport_resource;
 139 extern struct resource iomem_resource;
 140
 141 extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
 142 extern int request_resource(struct resource *root, struct resource *new);
 143 extern int release_resource(struct resource *new);
 144 void release_child_resources(struct resource *new);
 145 extern void reserve_region_with_split(struct resource *root,
 146                              resource_size_t start, resource_size_t end,
 147                              const char *name);
 148 extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new);
 149 extern int insert_resource(struct resource *parent, struct resource *new);
 150 extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
 151 extern void arch_remove_reservations(struct resource *avail);
 152 extern int allocate_resource(struct resource *root, struct resource *new,
 153                              resource_size_t size, resource_size_t min,
 154                              resource_size_t max, resource_size_t align,
 155                              resource_size_t (*alignf)(void *,
 156                                                        const struct resource *,
 157                                                        resource_size_t,
 158                                                        resource_size_t),
 159                              void *alignf_data);
 160 struct resource *lookup_resource(struct resource *root, resource_size_t start);
 161 int adjust_resource(struct resource *res, resource_size_t start,
 162                     resource_size_t size);
 163 resource_size_t resource_alignment(struct resource *res);
 164 static inline resource_size_t resource_size(const struct resource *res)
 165 {
 166         return res->end - res->start + 1;
 167 }
 168 static inline unsigned long resource_type(const struct resource *res)
 169 {
 170         return res->flags & IORESOURCE_TYPE_BITS;
 171 }
 172
 173 /* Convenience shorthand with allocation */
 174 #define request_region(start,n,name)            __request_region(&ioport_resource, (start), (n), (name), 0)
 175 #define request_muxed_region(start,n,name)      __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
 176 #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
 177 #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
 178 #define request_mem_region_exclusive(start,n,name) \
 179         __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
 180 #define rename_region(region, newname) do { (region)->name = (newname); } while (0)
 181
 182 extern struct resource * __request_region(struct resource *,
 183                                         resource_size_t start,
 184                                         resource_size_t n,
 185                                         const char *name, int flags);
 186
 187 /* Compatibility cruft */
 188 #define release_region(start,n) __release_region(&ioport_resource, (start), (n))
 189 #define check_mem_region(start,n)       __check_region(&iomem_resource, (start), (n))
 190 #define release_mem_region(start,n)     __release_region(&iomem_resource, (start), (n))
 191
 192 extern int __check_region(struct resource *, resource_size_t, resource_size_t);
 193 extern void __release_region(struct resource *, resource_size_t,
 194                                 resource_size_t);
 195 #ifdef CONFIG_MEMORY_HOTREMOVE
 196 extern int release_mem_region_adjustable(struct resource *, resource_size_t,
 197                                 resource_size_t);
 198 #endif
 199
 200 static inline int __deprecated check_region(resource_size_t s,
 201                                                 resource_size_t n)
 202 {
 203         return __check_region(&ioport_resource, s, n);
 204 }
 205
 206 /* Wrappers for managed devices */
 207 struct device;
 208 #define devm_request_region(dev,start,n,name) \
 209         __devm_request_region(dev, &ioport_resource, (start), (n), (name))
 210 #define devm_request_mem_region(dev,start,n,name) \
 211         __devm_request_region(dev, &iomem_resource, (start), (n), (name))
 212
 213 extern struct resource * __devm_request_region(struct device *dev,
 214                                 struct resource *parent, resource_size_t start,
 215                                 resource_size_t n, const char *name);
 216
 217 #define devm_release_region(dev, start, n) \
 218         __devm_release_region(dev, &ioport_resource, (start), (n))
 219 #define devm_release_mem_region(dev, start, n) \
 220         __devm_release_region(dev, &iomem_resource, (start), (n))
 221
 222 extern void __devm_release_region(struct device *dev, struct resource *parent,
 223                                   resource_size_t start, resource_size_t n);
 224 extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
 225 extern int iomem_is_exclusive(u64 addr);
 226
 227 extern int
 228 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 229                 void *arg, int (*func)(unsigned long, unsigned long, void *));
 230
 231 /* True if any part of r1 overlaps r2 */
 232 static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
 233 {
 234        return (r1->start <= r2->end && r1->end >= r2->start);
 235 }
 236
 237
 238 #endif /* __ASSEMBLY__ */
 239 #endif  /* _LINUX_IOPORT_H */