2 * ioport.h Definitions of routines for detecting, reserving and
3 * allocating system resources.
5 * Authors: Linus Torvalds
8 #ifndef _LINUX_IOPORT_H
9 #define _LINUX_IOPORT_H
12 #include <linux/compiler.h>
13 #include <linux/types.h>
15 * Resources are tree-like, allowing
19 resource_size_t start;
23 struct resource *parent, *sibling, *child;
26 struct resource_list {
27 struct resource_list *next;
33 * IO resources have these defined flags.
35 #define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */
37 #define IORESOURCE_IO 0x00000100 /* Resource type */
38 #define IORESOURCE_MEM 0x00000200
39 #define IORESOURCE_IRQ 0x00000400
40 #define IORESOURCE_DMA 0x00000800
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
48 #define IORESOURCE_SIZEALIGN 0x00020000 /* size indicates alignment */
49 #define IORESOURCE_STARTALIGN 0x00040000 /* start field is alignment */
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 */
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 #define IORESOURCE_IRQ_OPTIONAL (1<<5)
64 /* PnP DMA specific bits (IORESOURCE_BITS) */
65 #define IORESOURCE_DMA_TYPE_MASK (3<<0)
66 #define IORESOURCE_DMA_8BIT (0<<0)
67 #define IORESOURCE_DMA_8AND16BIT (1<<0)
68 #define IORESOURCE_DMA_16BIT (2<<0)
70 #define IORESOURCE_DMA_MASTER (1<<2)
71 #define IORESOURCE_DMA_BYTE (1<<3)
72 #define IORESOURCE_DMA_WORD (1<<4)
74 #define IORESOURCE_DMA_SPEED_MASK (3<<6)
75 #define IORESOURCE_DMA_COMPATIBLE (0<<6)
76 #define IORESOURCE_DMA_TYPEA (1<<6)
77 #define IORESOURCE_DMA_TYPEB (2<<6)
78 #define IORESOURCE_DMA_TYPEF (3<<6)
80 /* PnP memory I/O specific bits (IORESOURCE_BITS) */
81 #define IORESOURCE_MEM_WRITEABLE (1<<0) /* dup: IORESOURCE_READONLY */
82 #define IORESOURCE_MEM_CACHEABLE (1<<1) /* dup: IORESOURCE_CACHEABLE */
83 #define IORESOURCE_MEM_RANGELENGTH (1<<2) /* dup: IORESOURCE_RANGELENGTH */
84 #define IORESOURCE_MEM_TYPE_MASK (3<<3)
85 #define IORESOURCE_MEM_8BIT (0<<3)
86 #define IORESOURCE_MEM_16BIT (1<<3)
87 #define IORESOURCE_MEM_8AND16BIT (2<<3)
88 #define IORESOURCE_MEM_32BIT (3<<3)
89 #define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */
90 #define IORESOURCE_MEM_EXPANSIONROM (1<<6)
92 /* PnP I/O specific bits (IORESOURCE_BITS) */
93 #define IORESOURCE_IO_16BIT_ADDR (1<<0)
94 #define IORESOURCE_IO_FIXED (1<<1)
96 /* PCI ROM control bits (IORESOURCE_BITS) */
97 #define IORESOURCE_ROM_ENABLE (1<<0) /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
98 #define IORESOURCE_ROM_SHADOW (1<<1) /* ROM is copy at C000:0 */
99 #define IORESOURCE_ROM_COPY (1<<2) /* ROM is alloc'd copy, resource field overlaid */
100 #define IORESOURCE_ROM_BIOS_COPY (1<<3) /* ROM is BIOS copy, resource field overlaid */
102 /* PCI control bits. Shares IORESOURCE_BITS with above PCI ROM. */
103 #define IORESOURCE_PCI_FIXED (1<<4) /* Do not move resource */
105 /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
106 extern struct resource ioport_resource;
107 extern struct resource iomem_resource;
109 extern int request_resource(struct resource *root, struct resource *new);
110 extern int release_resource(struct resource *new);
111 extern int insert_resource(struct resource *parent, struct resource *new);
112 extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
113 extern int allocate_resource(struct resource *root, struct resource *new,
114 resource_size_t size, resource_size_t min,
115 resource_size_t max, resource_size_t align,
116 void (*alignf)(void *, struct resource *,
117 resource_size_t, resource_size_t),
119 int adjust_resource(struct resource *res, resource_size_t start,
120 resource_size_t size);
121 resource_size_t resource_alignment(struct resource *res);
122 static inline resource_size_t resource_size(struct resource *res)
124 return res->end - res->start + 1;
127 /* Convenience shorthand with allocation */
128 #define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name))
129 #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name))
130 #define rename_region(region, newname) do { (region)->name = (newname); } while (0)
132 extern struct resource * __request_region(struct resource *,
133 resource_size_t start,
134 resource_size_t n, const char *name);
136 /* Compatibility cruft */
137 #define release_region(start,n) __release_region(&ioport_resource, (start), (n))
138 #define check_mem_region(start,n) __check_region(&iomem_resource, (start), (n))
139 #define release_mem_region(start,n) __release_region(&iomem_resource, (start), (n))
141 extern int __check_region(struct resource *, resource_size_t, resource_size_t);
142 extern void __release_region(struct resource *, resource_size_t,
145 static inline int __deprecated check_region(resource_size_t s,
148 return __check_region(&ioport_resource, s, n);
151 /* Wrappers for managed devices */
153 #define devm_request_region(dev,start,n,name) \
154 __devm_request_region(dev, &ioport_resource, (start), (n), (name))
155 #define devm_request_mem_region(dev,start,n,name) \
156 __devm_request_region(dev, &iomem_resource, (start), (n), (name))
158 extern struct resource * __devm_request_region(struct device *dev,
159 struct resource *parent, resource_size_t start,
160 resource_size_t n, const char *name);
162 #define devm_release_region(start,n) \
163 __devm_release_region(dev, &ioport_resource, (start), (n))
164 #define devm_release_mem_region(start,n) \
165 __devm_release_region(dev, &iomem_resource, (start), (n))
167 extern void __devm_release_region(struct device *dev, struct resource *parent,
168 resource_size_t start, resource_size_t n);
170 #endif /* __ASSEMBLY__ */
171 #endif /* _LINUX_IOPORT_H */