[mirror_ubuntu-zesty-kernel.git] / include / linux / ioport.h

/*
 * ioport.h	Definitions of routines for detecting, reserving and
 *		allocating system resources.
 *
 * Authors:	Linus Torvalds
 */

#ifndef _LINUX_IOPORT_H
#define _LINUX_IOPORT_H

#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <linux/types.h>
/*
 * Resources are tree-like, allowing
 * nesting etc..
 */
struct resource {
	resource_size_t start;
	resource_size_t end;
	const char *name;
	unsigned long flags;
	unsigned long desc;
	struct resource *parent, *sibling, *child;
};

/*
 * IO resources have these defined flags.
 */
#define IORESOURCE_BITS		0x000000ff	/* Bus-specific bits */

#define IORESOURCE_TYPE_BITS	0x00001f00	/* Resource type */
#define IORESOURCE_IO		0x00000100	/* PCI/ISA I/O ports */
#define IORESOURCE_MEM		0x00000200
#define IORESOURCE_REG		0x00000300	/* Register offsets */
#define IORESOURCE_IRQ		0x00000400
#define IORESOURCE_DMA		0x00000800
#define IORESOURCE_BUS		0x00001000

#define IORESOURCE_PREFETCH	0x00002000	/* No side effects */
#define IORESOURCE_READONLY	0x00004000
#define IORESOURCE_CACHEABLE	0x00008000
#define IORESOURCE_RANGELENGTH	0x00010000
#define IORESOURCE_SHADOWABLE	0x00020000

#define IORESOURCE_SIZEALIGN	0x00040000	/* size indicates alignment */
#define IORESOURCE_STARTALIGN	0x00080000	/* start field is alignment */

#define IORESOURCE_MEM_64	0x00100000
#define IORESOURCE_WINDOW	0x00200000	/* forwarded by bridge */
#define IORESOURCE_MUXED	0x00400000	/* Resource is software muxed */

#define IORESOURCE_EXT_TYPE_BITS 0x01000000	/* Resource extended types */
#define IORESOURCE_SYSRAM	0x01000000	/* System RAM (modifier) */

#define IORESOURCE_EXCLUSIVE	0x08000000	/* Userland may not map this resource */

#define IORESOURCE_DISABLED	0x10000000
#define IORESOURCE_UNSET	0x20000000	/* No address assigned yet */
#define IORESOURCE_AUTO		0x40000000
#define IORESOURCE_BUSY		0x80000000	/* Driver has marked this resource busy */

/* I/O resource extended types */
#define IORESOURCE_SYSTEM_RAM		(IORESOURCE_MEM|IORESOURCE_SYSRAM)

/* PnP IRQ specific bits (IORESOURCE_BITS) */
#define IORESOURCE_IRQ_HIGHEDGE		(1<<0)
#define IORESOURCE_IRQ_LOWEDGE		(1<<1)
#define IORESOURCE_IRQ_HIGHLEVEL	(1<<2)
#define IORESOURCE_IRQ_LOWLEVEL		(1<<3)
#define IORESOURCE_IRQ_SHAREABLE	(1<<4)
#define IORESOURCE_IRQ_OPTIONAL 	(1<<5)

/* PnP DMA specific bits (IORESOURCE_BITS) */
#define IORESOURCE_DMA_TYPE_MASK	(3<<0)
#define IORESOURCE_DMA_8BIT		(0<<0)
#define IORESOURCE_DMA_8AND16BIT	(1<<0)
#define IORESOURCE_DMA_16BIT		(2<<0)

#define IORESOURCE_DMA_MASTER		(1<<2)
#define IORESOURCE_DMA_BYTE		(1<<3)
#define IORESOURCE_DMA_WORD		(1<<4)

#define IORESOURCE_DMA_SPEED_MASK	(3<<6)
#define IORESOURCE_DMA_COMPATIBLE	(0<<6)
#define IORESOURCE_DMA_TYPEA		(1<<6)
#define IORESOURCE_DMA_TYPEB		(2<<6)
#define IORESOURCE_DMA_TYPEF		(3<<6)

/* PnP memory I/O specific bits (IORESOURCE_BITS) */
#define IORESOURCE_MEM_WRITEABLE	(1<<0)	/* dup: IORESOURCE_READONLY */
#define IORESOURCE_MEM_CACHEABLE	(1<<1)	/* dup: IORESOURCE_CACHEABLE */
#define IORESOURCE_MEM_RANGELENGTH	(1<<2)	/* dup: IORESOURCE_RANGELENGTH */
#define IORESOURCE_MEM_TYPE_MASK	(3<<3)
#define IORESOURCE_MEM_8BIT		(0<<3)
#define IORESOURCE_MEM_16BIT		(1<<3)
#define IORESOURCE_MEM_8AND16BIT	(2<<3)
#define IORESOURCE_MEM_32BIT		(3<<3)
#define IORESOURCE_MEM_SHADOWABLE	(1<<5)	/* dup: IORESOURCE_SHADOWABLE */
#define IORESOURCE_MEM_EXPANSIONROM	(1<<6)

/* PnP I/O specific bits (IORESOURCE_BITS) */
#define IORESOURCE_IO_16BIT_ADDR	(1<<0)
#define IORESOURCE_IO_FIXED		(1<<1)
#define IORESOURCE_IO_SPARSE		(1<<2)

/* PCI ROM control bits (IORESOURCE_BITS) */
#define IORESOURCE_ROM_ENABLE		(1<<0)	/* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
#define IORESOURCE_ROM_SHADOW		(1<<1)	/* Use RAM image, not ROM BAR */

/* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
#define IORESOURCE_PCI_FIXED		(1<<4)	/* Do not move resource */

/*
 * I/O Resource Descriptors
 *
 * Descriptors are used by walk_iomem_res_desc() and region_intersects()
 * for searching a specific resource range in the iomem table.  Assign
 * a new descriptor when a resource range supports the search interfaces.
 * Otherwise, resource.desc must be set to IORES_DESC_NONE (0).
 */
enum {
	IORES_DESC_NONE				= 0,
	IORES_DESC_CRASH_KERNEL			= 1,
	IORES_DESC_ACPI_TABLES			= 2,
	IORES_DESC_ACPI_NV_STORAGE		= 3,
	IORES_DESC_PERSISTENT_MEMORY		= 4,
	IORES_DESC_PERSISTENT_MEMORY_LEGACY	= 5,
};

/* helpers to define resources */
#define DEFINE_RES_NAMED(_start, _size, _name, _flags)			\
	{								\
		.start = (_start),					\
		.end = (_start) + (_size) - 1,				\
		.name = (_name),					\
		.flags = (_flags),					\
		.desc = IORES_DESC_NONE,				\
	}

#define DEFINE_RES_IO_NAMED(_start, _size, _name)			\
	DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
#define DEFINE_RES_IO(_start, _size)					\
	DEFINE_RES_IO_NAMED((_start), (_size), NULL)

#define DEFINE_RES_MEM_NAMED(_start, _size, _name)			\
	DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
#define DEFINE_RES_MEM(_start, _size)					\
	DEFINE_RES_MEM_NAMED((_start), (_size), NULL)

#define DEFINE_RES_IRQ_NAMED(_irq, _name)				\
	DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
#define DEFINE_RES_IRQ(_irq)						\
	DEFINE_RES_IRQ_NAMED((_irq), NULL)

#define DEFINE_RES_DMA_NAMED(_dma, _name)				\
	DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
#define DEFINE_RES_DMA(_dma)						\
	DEFINE_RES_DMA_NAMED((_dma), NULL)

/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
extern struct resource ioport_resource;
extern struct resource iomem_resource;

extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
extern int request_resource(struct resource *root, struct resource *new);
extern int release_resource(struct resource *new);
void release_child_resources(struct resource *new);
extern void reserve_region_with_split(struct resource *root,
			     resource_size_t start, resource_size_t end,
			     const char *name);
extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new);
extern int insert_resource(struct resource *parent, struct resource *new);
extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
extern int remove_resource(struct resource *old);
extern void arch_remove_reservations(struct resource *avail);
extern int allocate_resource(struct resource *root, struct resource *new,
			     resource_size_t size, resource_size_t min,
			     resource_size_t max, resource_size_t align,
			     resource_size_t (*alignf)(void *,
						       const struct resource *,
						       resource_size_t,
						       resource_size_t),
			     void *alignf_data);
struct resource *lookup_resource(struct resource *root, resource_size_t start);
int adjust_resource(struct resource *res, resource_size_t start,
		    resource_size_t size);
resource_size_t resource_alignment(struct resource *res);
static inline resource_size_t resource_size(const struct resource *res)
{
	return res->end - res->start + 1;
}
static inline unsigned long resource_type(const struct resource *res)
{
	return res->flags & IORESOURCE_TYPE_BITS;
}
static inline unsigned long resource_ext_type(const struct resource *res)
{
	return res->flags & IORESOURCE_EXT_TYPE_BITS;
}
/* True iff r1 completely contains r2 */
static inline bool resource_contains(struct resource *r1, struct resource *r2)
{
	if (resource_type(r1) != resource_type(r2))
		return false;
	if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
		return false;
	return r1->start <= r2->start && r1->end >= r2->end;
}


/* Convenience shorthand with allocation */
#define request_region(start,n,name)		__request_region(&ioport_resource, (start), (n), (name), 0)
#define request_muxed_region(start,n,name)	__request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
#define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
#define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
#define request_mem_region_exclusive(start,n,name) \
	__request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
#define rename_region(region, newname) do { (region)->name = (newname); } while (0)

extern struct resource * __request_region(struct resource *,
					resource_size_t start,
					resource_size_t n,
					const char *name, int flags);

/* Compatibility cruft */
#define release_region(start,n)	__release_region(&ioport_resource, (start), (n))
#define release_mem_region(start,n)	__release_region(&iomem_resource, (start), (n))

extern void __release_region(struct resource *, resource_size_t,
				resource_size_t);
#ifdef CONFIG_MEMORY_HOTREMOVE
extern int release_mem_region_adjustable(struct resource *, resource_size_t,
				resource_size_t);
#endif

/* Wrappers for managed devices */
struct device;

extern int devm_request_resource(struct device *dev, struct resource *root,
				 struct resource *new);
extern void devm_release_resource(struct device *dev, struct resource *new);

#define devm_request_region(dev,start,n,name) \
	__devm_request_region(dev, &ioport_resource, (start), (n), (name))
#define devm_request_mem_region(dev,start,n,name) \
	__devm_request_region(dev, &iomem_resource, (start), (n), (name))

extern struct resource * __devm_request_region(struct device *dev,
				struct resource *parent, resource_size_t start,
				resource_size_t n, const char *name);

#define devm_release_region(dev, start, n) \
	__devm_release_region(dev, &ioport_resource, (start), (n))
#define devm_release_mem_region(dev, start, n) \
	__devm_release_region(dev, &iomem_resource, (start), (n))

extern void __devm_release_region(struct device *dev, struct resource *parent,
				  resource_size_t start, resource_size_t n);
extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
extern int iomem_is_exclusive(u64 addr);

extern int
walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
		void *arg, int (*func)(unsigned long, unsigned long, void *));
extern int
walk_system_ram_res(u64 start, u64 end, void *arg,
		    int (*func)(u64, u64, void *));
extern int
walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
		    void *arg, int (*func)(u64, u64, void *));

/* True if any part of r1 overlaps r2 */
static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
{
       return (r1->start <= r2->end && r1->end >= r2->start);
}


#endif /* __ASSEMBLY__ */
#endif	/* _LINUX_IOPORT_H */
Commit	Line	Data
	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	unsigned long desc;
	24	struct resource parent, sibling, *child;
	25	};
	26
	27	/*
	28	* IO resources have these defined flags.
	29	*/
	30	#define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */
	31
	32	#define IORESOURCE_TYPE_BITS 0x00001f00 /* Resource type */
	33	#define IORESOURCE_IO 0x00000100 /* PCI/ISA I/O ports */
	34	#define IORESOURCE_MEM 0x00000200
	35	#define IORESOURCE_REG 0x00000300 /* Register offsets */
	36	#define IORESOURCE_IRQ 0x00000400
	37	#define IORESOURCE_DMA 0x00000800
	38	#define IORESOURCE_BUS 0x00001000
	39
	40	#define IORESOURCE_PREFETCH 0x00002000 /* No side effects */
	41	#define IORESOURCE_READONLY 0x00004000
	42	#define IORESOURCE_CACHEABLE 0x00008000
	43	#define IORESOURCE_RANGELENGTH 0x00010000
	44	#define IORESOURCE_SHADOWABLE 0x00020000
	45
	46	#define IORESOURCE_SIZEALIGN 0x00040000 /* size indicates alignment */
	47	#define IORESOURCE_STARTALIGN 0x00080000 /* start field is alignment */
	48
	49	#define IORESOURCE_MEM_64 0x00100000
	50	#define IORESOURCE_WINDOW 0x00200000 /* forwarded by bridge */
	51	#define IORESOURCE_MUXED 0x00400000 /* Resource is software muxed */
	52
	53	#define IORESOURCE_EXT_TYPE_BITS 0x01000000 /* Resource extended types */
	54	#define IORESOURCE_SYSRAM 0x01000000 /* System RAM (modifier) */
	55
	56	#define IORESOURCE_EXCLUSIVE 0x08000000 /* Userland may not map this resource */
	57
	58	#define IORESOURCE_DISABLED 0x10000000
	59	#define IORESOURCE_UNSET 0x20000000 /* No address assigned yet */
	60	#define IORESOURCE_AUTO 0x40000000
	61	#define IORESOURCE_BUSY 0x80000000 /* Driver has marked this resource busy */
	62
	63	/* I/O resource extended types */
	64	#define IORESOURCE_SYSTEM_RAM (IORESOURCE_MEM\|IORESOURCE_SYSRAM)
	65
	66	/* PnP IRQ specific bits (IORESOURCE_BITS) */
	67	#define IORESOURCE_IRQ_HIGHEDGE (1<<0)
	68	#define IORESOURCE_IRQ_LOWEDGE (1<<1)
	69	#define IORESOURCE_IRQ_HIGHLEVEL (1<<2)
	70	#define IORESOURCE_IRQ_LOWLEVEL (1<<3)
	71	#define IORESOURCE_IRQ_SHAREABLE (1<<4)
	72	#define IORESOURCE_IRQ_OPTIONAL (1<<5)
	73
	74	/* PnP DMA specific bits (IORESOURCE_BITS) */
	75	#define IORESOURCE_DMA_TYPE_MASK (3<<0)
	76	#define IORESOURCE_DMA_8BIT (0<<0)
	77	#define IORESOURCE_DMA_8AND16BIT (1<<0)
	78	#define IORESOURCE_DMA_16BIT (2<<0)
	79
	80	#define IORESOURCE_DMA_MASTER (1<<2)
	81	#define IORESOURCE_DMA_BYTE (1<<3)
	82	#define IORESOURCE_DMA_WORD (1<<4)
	83
	84	#define IORESOURCE_DMA_SPEED_MASK (3<<6)
	85	#define IORESOURCE_DMA_COMPATIBLE (0<<6)
	86	#define IORESOURCE_DMA_TYPEA (1<<6)
	87	#define IORESOURCE_DMA_TYPEB (2<<6)
	88	#define IORESOURCE_DMA_TYPEF (3<<6)
	89
	90	/* PnP memory I/O specific bits (IORESOURCE_BITS) */
	91	#define IORESOURCE_MEM_WRITEABLE (1<<0) /* dup: IORESOURCE_READONLY */
	92	#define IORESOURCE_MEM_CACHEABLE (1<<1) /* dup: IORESOURCE_CACHEABLE */
	93	#define IORESOURCE_MEM_RANGELENGTH (1<<2) /* dup: IORESOURCE_RANGELENGTH */
	94	#define IORESOURCE_MEM_TYPE_MASK (3<<3)
	95	#define IORESOURCE_MEM_8BIT (0<<3)
	96	#define IORESOURCE_MEM_16BIT (1<<3)
	97	#define IORESOURCE_MEM_8AND16BIT (2<<3)
	98	#define IORESOURCE_MEM_32BIT (3<<3)
	99	#define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */
	100	#define IORESOURCE_MEM_EXPANSIONROM (1<<6)
	101
	102	/* PnP I/O specific bits (IORESOURCE_BITS) */
	103	#define IORESOURCE_IO_16BIT_ADDR (1<<0)
	104	#define IORESOURCE_IO_FIXED (1<<1)
	105	#define IORESOURCE_IO_SPARSE (1<<2)
	106
	107	/* PCI ROM control bits (IORESOURCE_BITS) */
	108	#define IORESOURCE_ROM_ENABLE (1<<0) /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
	109	#define IORESOURCE_ROM_SHADOW (1<<1) /* Use RAM image, not ROM BAR */
	110
	111	/* PCI control bits. Shares IORESOURCE_BITS with above PCI ROM. */
	112	#define IORESOURCE_PCI_FIXED (1<<4) /* Do not move resource */
	113
	114	/*
	115	* I/O Resource Descriptors
	116	*
	117	* Descriptors are used by walk_iomem_res_desc() and region_intersects()
	118	* for searching a specific resource range in the iomem table. Assign
	119	* a new descriptor when a resource range supports the search interfaces.
	120	* Otherwise, resource.desc must be set to IORES_DESC_NONE (0).
	121	*/
	122	enum {
	123	IORES_DESC_NONE = 0,
	124	IORES_DESC_CRASH_KERNEL = 1,
	125	IORES_DESC_ACPI_TABLES = 2,
	126	IORES_DESC_ACPI_NV_STORAGE = 3,
	127	IORES_DESC_PERSISTENT_MEMORY = 4,
	128	IORES_DESC_PERSISTENT_MEMORY_LEGACY = 5,
	129	};
	130
	131	/* helpers to define resources */
	132	#define DEFINE_RES_NAMED(_start, _size, _name, _flags) \
	133	{ \
	134	.start = (_start), \
	135	.end = (_start) + (_size) - 1, \
	136	.name = (_name), \
	137	.flags = (_flags), \
	138	.desc = IORES_DESC_NONE, \
	139	}
	140
	141	#define DEFINE_RES_IO_NAMED(_start, _size, _name) \
	142	DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
	143	#define DEFINE_RES_IO(_start, _size) \
	144	DEFINE_RES_IO_NAMED((_start), (_size), NULL)
	145
	146	#define DEFINE_RES_MEM_NAMED(_start, _size, _name) \
	147	DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
	148	#define DEFINE_RES_MEM(_start, _size) \
	149	DEFINE_RES_MEM_NAMED((_start), (_size), NULL)
	150
	151	#define DEFINE_RES_IRQ_NAMED(_irq, _name) \
	152	DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
	153	#define DEFINE_RES_IRQ(_irq) \
	154	DEFINE_RES_IRQ_NAMED((_irq), NULL)
	155
	156	#define DEFINE_RES_DMA_NAMED(_dma, _name) \
	157	DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
	158	#define DEFINE_RES_DMA(_dma) \
	159	DEFINE_RES_DMA_NAMED((_dma), NULL)
	160
	161	/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
	162	extern struct resource ioport_resource;
	163	extern struct resource iomem_resource;
	164
	165	extern struct resource request_resource_conflict(struct resource root, struct resource *new);
	166	extern int request_resource(struct resource root, struct resource new);
	167	extern int release_resource(struct resource *new);
	168	void release_child_resources(struct resource *new);
	169	extern void reserve_region_with_split(struct resource *root,
	170	resource_size_t start, resource_size_t end,
	171	const char *name);
	172	extern struct resource insert_resource_conflict(struct resource parent, struct resource *new);
	173	extern int insert_resource(struct resource parent, struct resource new);
	174	extern void insert_resource_expand_to_fit(struct resource root, struct resource new);
	175	extern int remove_resource(struct resource *old);
	176	extern void arch_remove_reservations(struct resource *avail);
	177	extern int allocate_resource(struct resource root, struct resource new,
	178	resource_size_t size, resource_size_t min,
	179	resource_size_t max, resource_size_t align,
	180	resource_size_t (alignf)(void ,
	181	const struct resource *,
	182	resource_size_t,
	183	resource_size_t),
	184	void *alignf_data);
	185	struct resource lookup_resource(struct resource root, resource_size_t start);
	186	int adjust_resource(struct resource *res, resource_size_t start,
	187	resource_size_t size);
	188	resource_size_t resource_alignment(struct resource *res);
	189	static inline resource_size_t resource_size(const struct resource *res)
	190	{
	191	return res->end - res->start + 1;
	192	}
	193	static inline unsigned long resource_type(const struct resource *res)
	194	{
	195	return res->flags & IORESOURCE_TYPE_BITS;
	196	}
	197	static inline unsigned long resource_ext_type(const struct resource *res)
	198	{
	199	return res->flags & IORESOURCE_EXT_TYPE_BITS;
	200	}
	201	/* True iff r1 completely contains r2 */
	202	static inline bool resource_contains(struct resource r1, struct resource r2)
	203	{
	204	if (resource_type(r1) != resource_type(r2))
	205	return false;
	206	if (r1->flags & IORESOURCE_UNSET \|\| r2->flags & IORESOURCE_UNSET)
	207	return false;
	208	return r1->start <= r2->start && r1->end >= r2->end;
	209	}
	210
	211
	212	/* Convenience shorthand with allocation */
	213	#define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0)
	214	#define request_muxed_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
	215	#define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
	216	#define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
	217	#define request_mem_region_exclusive(start,n,name) \
	218	__request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
	219	#define rename_region(region, newname) do { (region)->name = (newname); } while (0)
	220
	221	extern struct resource * __request_region(struct resource *,
	222	resource_size_t start,
	223	resource_size_t n,
	224	const char *name, int flags);
	225
	226	/* Compatibility cruft */
	227	#define release_region(start,n) __release_region(&ioport_resource, (start), (n))
	228	#define release_mem_region(start,n) __release_region(&iomem_resource, (start), (n))
	229
	230	extern void __release_region(struct resource *, resource_size_t,
	231	resource_size_t);
	232	#ifdef CONFIG_MEMORY_HOTREMOVE
	233	extern int release_mem_region_adjustable(struct resource *, resource_size_t,
	234	resource_size_t);
	235	#endif
	236
	237	/* Wrappers for managed devices */
	238	struct device;
	239
	240	extern int devm_request_resource(struct device dev, struct resource root,
	241	struct resource *new);
	242	extern void devm_release_resource(struct device dev, struct resource new);
	243
	244	#define devm_request_region(dev,start,n,name) \
	245	__devm_request_region(dev, &ioport_resource, (start), (n), (name))
	246	#define devm_request_mem_region(dev,start,n,name) \
	247	__devm_request_region(dev, &iomem_resource, (start), (n), (name))
	248
	249	extern struct resource * __devm_request_region(struct device *dev,
	250	struct resource *parent, resource_size_t start,
	251	resource_size_t n, const char *name);
	252
	253	#define devm_release_region(dev, start, n) \
	254	__devm_release_region(dev, &ioport_resource, (start), (n))
	255	#define devm_release_mem_region(dev, start, n) \
	256	__devm_release_region(dev, &iomem_resource, (start), (n))
	257
	258	extern void __devm_release_region(struct device dev, struct resource parent,
	259	resource_size_t start, resource_size_t n);
	260	extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
	261	extern int iomem_is_exclusive(u64 addr);
	262
	263	extern int
	264	walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
	265	void arg, int (func)(unsigned long, unsigned long, void *));
	266	extern int
	267	walk_system_ram_res(u64 start, u64 end, void *arg,
	268	int (func)(u64, u64, void ));
	269	extern int
	270	walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
	271	void arg, int (func)(u64, u64, void *));
	272
	273	/* True if any part of r1 overlaps r2 */
	274	static inline bool resource_overlaps(struct resource r1, struct resource r2)
	275	{
	276	return (r1->start <= r2->end && r1->end >= r2->start);
	277	}
	278
	279
	280	#endif /* __ASSEMBLY__ */
	281	#endif /* _LINUX_IOPORT_H */