include/linux/ioport.h - kernel/msm-4.19 - Gitiles

 /*
  * 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.
  *
  * PCI devices expose these flags to userspace in the "resource" sysfs file,
  * so don't move them.
  */
 #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 */
 #define IORESOURCE_PCI_EA_BEI		(1<<5)	/* BAR Equivalent Indicator */

 /*
  * 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,
 	IORES_DESC_DEVICE_PRIVATE_MEMORY	= 6,
 	IORES_DESC_DEVICE_PUBLIC_MEMORY		= 7,
 };

 /* 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 */
	/*
	* 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.
	*
	* PCI devices expose these flags to userspace in the "resource" sysfs file,
	* so don't move them.
	*/
	#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 */
	#define IORESOURCE_PCI_EA_BEI (1<<5) /* BAR Equivalent Indicator */

	/*
	* 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,
	IORES_DESC_DEVICE_PRIVATE_MEMORY = 6,
	IORES_DESC_DEVICE_PUBLIC_MEMORY = 7,
	};

	/* 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 */