xref: /openbmc/u-boot/include/linux/ioport.h (revision 8a452c2c)
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);
resource_size(const struct resource * res)129 static inline resource_size_t resource_size(const struct resource *res)
130 {
131 	return res->end - res->start + 1;
132 }
resource_type(const struct resource * res)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 
check_region(resource_size_t s,resource_size_t n)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 */
193