| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * 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/bits.h> |
| #include <linux/compiler.h> |
| #include <linux/minmax.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) */ |
| |
| /* IORESOURCE_SYSRAM specific bits. */ |
| #define IORESOURCE_SYSRAM_DRIVER_MANAGED 0x02000000 /* Always detected via a driver. */ |
| #define IORESOURCE_SYSRAM_MERGEABLE 0x04000000 /* Resource can be merged. */ |
| |
| #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_RESERVED = 7, |
| IORES_DESC_SOFT_RESERVED = 8, |
| }; |
| |
| /* |
| * Flags controlling ioremap() behavior. |
| */ |
| enum { |
| IORES_MAP_SYSTEM_RAM = BIT(0), |
| IORES_MAP_ENCRYPTED = BIT(1), |
| }; |
| |
| /* 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; |
| } |
| |
| /* 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; |
| } |
| |
| static inline bool |
| resource_intersection(struct resource *r1, struct resource *r2, struct resource *r) |
| { |
| if (!resource_overlaps(r1, r2)) |
| return false; |
| r->start = max(r1->start, r2->start); |
| r->end = min(r1->end, r2->end); |
| return true; |
| } |
| |
| static inline bool |
| resource_union(struct resource *r1, struct resource *r2, struct resource *r) |
| { |
| if (!resource_overlaps(r1, r2)) |
| return false; |
| r->start = min(r1->start, r2->start); |
| r->end = max(r1->end, r2->end); |
| return true; |
| } |
| |
| /* 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 void release_mem_region_adjustable(resource_size_t, resource_size_t); |
| #endif |
| #ifdef CONFIG_MEMORY_HOTPLUG |
| extern void merge_system_ram_resource(struct resource *res); |
| #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 bool 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_mem_res(u64 start, u64 end, void *arg, |
| int (*func)(struct resource *, void *)); |
| extern int |
| walk_system_ram_res(u64 start, u64 end, void *arg, |
| int (*func)(struct resource *, void *)); |
| extern int |
| walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end, |
| void *arg, int (*func)(struct resource *, void *)); |
| |
| struct resource *devm_request_free_mem_region(struct device *dev, |
| struct resource *base, unsigned long size); |
| struct resource *request_free_mem_region(struct resource *base, |
| unsigned long size, const char *name); |
| |
| static inline void irqresource_disabled(struct resource *res, u32 irq) |
| { |
| res->start = irq; |
| res->end = irq; |
| res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED | IORESOURCE_UNSET; |
| } |
| |
| extern struct address_space *iomem_get_mapping(void); |
| |
| #endif /* __ASSEMBLY__ */ |
| #endif /* _LINUX_IOPORT_H */ |