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); 195 196 static inline int __deprecated check_region(resource_size_t s, 197 resource_size_t n) 198 { 199 return __check_region(&ioport_resource, s, n); 200 } 201 202 /* Wrappers for managed devices */ 203 struct device; 204 #define devm_request_region(dev,start,n,name) \ 205 __devm_request_region(dev, &ioport_resource, (start), (n), (name)) 206 #define devm_request_mem_region(dev,start,n,name) \ 207 __devm_request_region(dev, &iomem_resource, (start), (n), (name)) 208 209 extern struct resource * __devm_request_region(struct device *dev, 210 struct resource *parent, resource_size_t start, 211 resource_size_t n, const char *name); 212 213 #define devm_release_region(dev, start, n) \ 214 __devm_release_region(dev, &ioport_resource, (start), (n)) 215 #define devm_release_mem_region(dev, start, n) \ 216 __devm_release_region(dev, &iomem_resource, (start), (n)) 217 218 extern void __devm_release_region(struct device *dev, struct resource *parent, 219 resource_size_t start, resource_size_t n); 220 extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size); 221 extern int iomem_is_exclusive(u64 addr); 222 223 extern int 224 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, 225 void *arg, int (*func)(unsigned long, unsigned long, void *)); 226 227 /* True if any part of r1 overlaps r2 */ 228 static inline bool resource_overlaps(struct resource *r1, struct resource *r2) 229 { 230 return (r1->start <= r2->end && r1->end >= r2->start); 231 } 232 233 234 #endif /* __ASSEMBLY__ */ 235 #endif /* _LINUX_IOPORT_H */ 236