LCOV - code coverage report
Current view: top level - include/linux - ioport.h (source / functions) Hit Total Coverage
Test: gcov_data_raspi2_real_modules_combined.info Lines: 3 8 37.5 %
Date: 2020-09-30 20:25:40 Functions: 0 1 0.0 %
Branches: 0 14 0.0 %

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : /*
       3                 :            :  * ioport.h     Definitions of routines for detecting, reserving and
       4                 :            :  *              allocating system resources.
       5                 :            :  *
       6                 :            :  * Authors:     Linus Torvalds
       7                 :            :  */
       8                 :            : 
       9                 :            : #ifndef _LINUX_IOPORT_H
      10                 :            : #define _LINUX_IOPORT_H
      11                 :            : 
      12                 :            : #ifndef __ASSEMBLY__
      13                 :            : #include <linux/compiler.h>
      14                 :            : #include <linux/types.h>
      15                 :            : #include <linux/bits.h>
      16                 :            : /*
      17                 :            :  * Resources are tree-like, allowing
      18                 :            :  * nesting etc..
      19                 :            :  */
      20                 :            : struct resource {
      21                 :            :         resource_size_t start;
      22                 :            :         resource_size_t end;
      23                 :            :         const char *name;
      24                 :            :         unsigned long flags;
      25                 :            :         unsigned long desc;
      26                 :            :         struct resource *parent, *sibling, *child;
      27                 :            : };
      28                 :            : 
      29                 :            : /*
      30                 :            :  * IO resources have these defined flags.
      31                 :            :  *
      32                 :            :  * PCI devices expose these flags to userspace in the "resource" sysfs file,
      33                 :            :  * so don't move them.
      34                 :            :  */
      35                 :            : #define IORESOURCE_BITS         0x000000ff      /* Bus-specific bits */
      36                 :            : 
      37                 :            : #define IORESOURCE_TYPE_BITS    0x00001f00      /* Resource type */
      38                 :            : #define IORESOURCE_IO           0x00000100      /* PCI/ISA I/O ports */
      39                 :            : #define IORESOURCE_MEM          0x00000200
      40                 :            : #define IORESOURCE_REG          0x00000300      /* Register offsets */
      41                 :            : #define IORESOURCE_IRQ          0x00000400
      42                 :            : #define IORESOURCE_DMA          0x00000800
      43                 :            : #define IORESOURCE_BUS          0x00001000
      44                 :            : 
      45                 :            : #define IORESOURCE_PREFETCH     0x00002000      /* No side effects */
      46                 :            : #define IORESOURCE_READONLY     0x00004000
      47                 :            : #define IORESOURCE_CACHEABLE    0x00008000
      48                 :            : #define IORESOURCE_RANGELENGTH  0x00010000
      49                 :            : #define IORESOURCE_SHADOWABLE   0x00020000
      50                 :            : 
      51                 :            : #define IORESOURCE_SIZEALIGN    0x00040000      /* size indicates alignment */
      52                 :            : #define IORESOURCE_STARTALIGN   0x00080000      /* start field is alignment */
      53                 :            : 
      54                 :            : #define IORESOURCE_MEM_64       0x00100000
      55                 :            : #define IORESOURCE_WINDOW       0x00200000      /* forwarded by bridge */
      56                 :            : #define IORESOURCE_MUXED        0x00400000      /* Resource is software muxed */
      57                 :            : 
      58                 :            : #define IORESOURCE_EXT_TYPE_BITS 0x01000000     /* Resource extended types */
      59                 :            : #define IORESOURCE_SYSRAM       0x01000000      /* System RAM (modifier) */
      60                 :            : 
      61                 :            : #define IORESOURCE_EXCLUSIVE    0x08000000      /* Userland may not map this resource */
      62                 :            : 
      63                 :            : #define IORESOURCE_DISABLED     0x10000000
      64                 :            : #define IORESOURCE_UNSET        0x20000000      /* No address assigned yet */
      65                 :            : #define IORESOURCE_AUTO         0x40000000
      66                 :            : #define IORESOURCE_BUSY         0x80000000      /* Driver has marked this resource busy */
      67                 :            : 
      68                 :            : /* I/O resource extended types */
      69                 :            : #define IORESOURCE_SYSTEM_RAM           (IORESOURCE_MEM|IORESOURCE_SYSRAM)
      70                 :            : 
      71                 :            : /* PnP IRQ specific bits (IORESOURCE_BITS) */
      72                 :            : #define IORESOURCE_IRQ_HIGHEDGE         (1<<0)
      73                 :            : #define IORESOURCE_IRQ_LOWEDGE          (1<<1)
      74                 :            : #define IORESOURCE_IRQ_HIGHLEVEL        (1<<2)
      75                 :            : #define IORESOURCE_IRQ_LOWLEVEL         (1<<3)
      76                 :            : #define IORESOURCE_IRQ_SHAREABLE        (1<<4)
      77                 :            : #define IORESOURCE_IRQ_OPTIONAL         (1<<5)
      78                 :            : 
      79                 :            : /* PnP DMA specific bits (IORESOURCE_BITS) */
      80                 :            : #define IORESOURCE_DMA_TYPE_MASK        (3<<0)
      81                 :            : #define IORESOURCE_DMA_8BIT             (0<<0)
      82                 :            : #define IORESOURCE_DMA_8AND16BIT        (1<<0)
      83                 :            : #define IORESOURCE_DMA_16BIT            (2<<0)
      84                 :            : 
      85                 :            : #define IORESOURCE_DMA_MASTER           (1<<2)
      86                 :            : #define IORESOURCE_DMA_BYTE             (1<<3)
      87                 :            : #define IORESOURCE_DMA_WORD             (1<<4)
      88                 :            : 
      89                 :            : #define IORESOURCE_DMA_SPEED_MASK       (3<<6)
      90                 :            : #define IORESOURCE_DMA_COMPATIBLE       (0<<6)
      91                 :            : #define IORESOURCE_DMA_TYPEA            (1<<6)
      92                 :            : #define IORESOURCE_DMA_TYPEB            (2<<6)
      93                 :            : #define IORESOURCE_DMA_TYPEF            (3<<6)
      94                 :            : 
      95                 :            : /* PnP memory I/O specific bits (IORESOURCE_BITS) */
      96                 :            : #define IORESOURCE_MEM_WRITEABLE        (1<<0)    /* dup: IORESOURCE_READONLY */
      97                 :            : #define IORESOURCE_MEM_CACHEABLE        (1<<1)    /* dup: IORESOURCE_CACHEABLE */
      98                 :            : #define IORESOURCE_MEM_RANGELENGTH      (1<<2)    /* dup: IORESOURCE_RANGELENGTH */
      99                 :            : #define IORESOURCE_MEM_TYPE_MASK        (3<<3)
     100                 :            : #define IORESOURCE_MEM_8BIT             (0<<3)
     101                 :            : #define IORESOURCE_MEM_16BIT            (1<<3)
     102                 :            : #define IORESOURCE_MEM_8AND16BIT        (2<<3)
     103                 :            : #define IORESOURCE_MEM_32BIT            (3<<3)
     104                 :            : #define IORESOURCE_MEM_SHADOWABLE       (1<<5)    /* dup: IORESOURCE_SHADOWABLE */
     105                 :            : #define IORESOURCE_MEM_EXPANSIONROM     (1<<6)
     106                 :            : 
     107                 :            : /* PnP I/O specific bits (IORESOURCE_BITS) */
     108                 :            : #define IORESOURCE_IO_16BIT_ADDR        (1<<0)
     109                 :            : #define IORESOURCE_IO_FIXED             (1<<1)
     110                 :            : #define IORESOURCE_IO_SPARSE            (1<<2)
     111                 :            : 
     112                 :            : /* PCI ROM control bits (IORESOURCE_BITS) */
     113                 :            : #define IORESOURCE_ROM_ENABLE           (1<<0)    /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
     114                 :            : #define IORESOURCE_ROM_SHADOW           (1<<1)    /* Use RAM image, not ROM BAR */
     115                 :            : 
     116                 :            : /* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
     117                 :            : #define IORESOURCE_PCI_FIXED            (1<<4)    /* Do not move resource */
     118                 :            : #define IORESOURCE_PCI_EA_BEI           (1<<5)    /* BAR Equivalent Indicator */
     119                 :            : 
     120                 :            : /*
     121                 :            :  * I/O Resource Descriptors
     122                 :            :  *
     123                 :            :  * Descriptors are used by walk_iomem_res_desc() and region_intersects()
     124                 :            :  * for searching a specific resource range in the iomem table.  Assign
     125                 :            :  * a new descriptor when a resource range supports the search interfaces.
     126                 :            :  * Otherwise, resource.desc must be set to IORES_DESC_NONE (0).
     127                 :            :  */
     128                 :            : enum {
     129                 :            :         IORES_DESC_NONE                         = 0,
     130                 :            :         IORES_DESC_CRASH_KERNEL                 = 1,
     131                 :            :         IORES_DESC_ACPI_TABLES                  = 2,
     132                 :            :         IORES_DESC_ACPI_NV_STORAGE              = 3,
     133                 :            :         IORES_DESC_PERSISTENT_MEMORY            = 4,
     134                 :            :         IORES_DESC_PERSISTENT_MEMORY_LEGACY     = 5,
     135                 :            :         IORES_DESC_DEVICE_PRIVATE_MEMORY        = 6,
     136                 :            :         IORES_DESC_RESERVED                     = 7,
     137                 :            : };
     138                 :            : 
     139                 :            : /*
     140                 :            :  * Flags controlling ioremap() behavior.
     141                 :            :  */
     142                 :            : enum {
     143                 :            :         IORES_MAP_SYSTEM_RAM            = BIT(0),
     144                 :            :         IORES_MAP_ENCRYPTED             = BIT(1),
     145                 :            : };
     146                 :            : 
     147                 :            : /* helpers to define resources */
     148                 :            : #define DEFINE_RES_NAMED(_start, _size, _name, _flags)                  \
     149                 :            :         {                                                               \
     150                 :            :                 .start = (_start),                                      \
     151                 :            :                 .end = (_start) + (_size) - 1,                          \
     152                 :            :                 .name = (_name),                                        \
     153                 :            :                 .flags = (_flags),                                      \
     154                 :            :                 .desc = IORES_DESC_NONE,                                \
     155                 :            :         }
     156                 :            : 
     157                 :            : #define DEFINE_RES_IO_NAMED(_start, _size, _name)                       \
     158                 :            :         DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
     159                 :            : #define DEFINE_RES_IO(_start, _size)                                    \
     160                 :            :         DEFINE_RES_IO_NAMED((_start), (_size), NULL)
     161                 :            : 
     162                 :            : #define DEFINE_RES_MEM_NAMED(_start, _size, _name)                      \
     163                 :            :         DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
     164                 :            : #define DEFINE_RES_MEM(_start, _size)                                   \
     165                 :            :         DEFINE_RES_MEM_NAMED((_start), (_size), NULL)
     166                 :            : 
     167                 :            : #define DEFINE_RES_IRQ_NAMED(_irq, _name)                               \
     168                 :            :         DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
     169                 :            : #define DEFINE_RES_IRQ(_irq)                                            \
     170                 :            :         DEFINE_RES_IRQ_NAMED((_irq), NULL)
     171                 :            : 
     172                 :            : #define DEFINE_RES_DMA_NAMED(_dma, _name)                               \
     173                 :            :         DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
     174                 :            : #define DEFINE_RES_DMA(_dma)                                            \
     175                 :            :         DEFINE_RES_DMA_NAMED((_dma), NULL)
     176                 :            : 
     177                 :            : /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
     178                 :            : extern struct resource ioport_resource;
     179                 :            : extern struct resource iomem_resource;
     180                 :            : 
     181                 :            : extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
     182                 :            : extern int request_resource(struct resource *root, struct resource *new);
     183                 :            : extern int release_resource(struct resource *new);
     184                 :            : void release_child_resources(struct resource *new);
     185                 :            : extern void reserve_region_with_split(struct resource *root,
     186                 :            :                              resource_size_t start, resource_size_t end,
     187                 :            :                              const char *name);
     188                 :            : extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new);
     189                 :            : extern int insert_resource(struct resource *parent, struct resource *new);
     190                 :            : extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);
     191                 :            : extern int remove_resource(struct resource *old);
     192                 :            : extern void arch_remove_reservations(struct resource *avail);
     193                 :            : extern int allocate_resource(struct resource *root, struct resource *new,
     194                 :            :                              resource_size_t size, resource_size_t min,
     195                 :            :                              resource_size_t max, resource_size_t align,
     196                 :            :                              resource_size_t (*alignf)(void *,
     197                 :            :                                                        const struct resource *,
     198                 :            :                                                        resource_size_t,
     199                 :            :                                                        resource_size_t),
     200                 :            :                              void *alignf_data);
     201                 :            : struct resource *lookup_resource(struct resource *root, resource_size_t start);
     202                 :            : int adjust_resource(struct resource *res, resource_size_t start,
     203                 :            :                     resource_size_t size);
     204                 :            : resource_size_t resource_alignment(struct resource *res);
     205                 :            : static inline resource_size_t resource_size(const struct resource *res)
     206                 :            : {
     207                 :       4347 :         return res->end - res->start + 1;
     208                 :            : }
     209                 :            : static inline unsigned long resource_type(const struct resource *res)
     210                 :            : {
     211                 :      11385 :         return res->flags & IORESOURCE_TYPE_BITS;
     212                 :            : }
     213                 :            : static inline unsigned long resource_ext_type(const struct resource *res)
     214                 :            : {
     215                 :       4140 :         return res->flags & IORESOURCE_EXT_TYPE_BITS;
     216                 :            : }
     217                 :            : /* True iff r1 completely contains r2 */
     218                 :          0 : static inline bool resource_contains(struct resource *r1, struct resource *r2)
     219                 :            : {
     220         [ #  # ]:          0 :         if (resource_type(r1) != resource_type(r2))
     221                 :            :                 return false;
     222   [ #  #  #  # ]:          0 :         if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
     223                 :            :                 return false;
     224   [ #  #  #  # ]:          0 :         return r1->start <= r2->start && r1->end >= r2->end;
     225                 :            : }
     226                 :            : 
     227                 :            : 
     228                 :            : /* Convenience shorthand with allocation */
     229                 :            : #define request_region(start,n,name)            __request_region(&ioport_resource, (start), (n), (name), 0)
     230                 :            : #define request_muxed_region(start,n,name)      __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
     231                 :            : #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
     232                 :            : #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
     233                 :            : #define request_mem_region_exclusive(start,n,name) \
     234                 :            :         __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
     235                 :            : #define rename_region(region, newname) do { (region)->name = (newname); } while (0)
     236                 :            : 
     237                 :            : extern struct resource * __request_region(struct resource *,
     238                 :            :                                         resource_size_t start,
     239                 :            :                                         resource_size_t n,
     240                 :            :                                         const char *name, int flags);
     241                 :            : 
     242                 :            : /* Compatibility cruft */
     243                 :            : #define release_region(start,n) __release_region(&ioport_resource, (start), (n))
     244                 :            : #define release_mem_region(start,n)     __release_region(&iomem_resource, (start), (n))
     245                 :            : 
     246                 :            : extern void __release_region(struct resource *, resource_size_t,
     247                 :            :                                 resource_size_t);
     248                 :            : #ifdef CONFIG_MEMORY_HOTREMOVE
     249                 :            : extern int release_mem_region_adjustable(struct resource *, resource_size_t,
     250                 :            :                                 resource_size_t);
     251                 :            : #endif
     252                 :            : 
     253                 :            : /* Wrappers for managed devices */
     254                 :            : struct device;
     255                 :            : 
     256                 :            : extern int devm_request_resource(struct device *dev, struct resource *root,
     257                 :            :                                  struct resource *new);
     258                 :            : extern void devm_release_resource(struct device *dev, struct resource *new);
     259                 :            : 
     260                 :            : #define devm_request_region(dev,start,n,name) \
     261                 :            :         __devm_request_region(dev, &ioport_resource, (start), (n), (name))
     262                 :            : #define devm_request_mem_region(dev,start,n,name) \
     263                 :            :         __devm_request_region(dev, &iomem_resource, (start), (n), (name))
     264                 :            : 
     265                 :            : extern struct resource * __devm_request_region(struct device *dev,
     266                 :            :                                 struct resource *parent, resource_size_t start,
     267                 :            :                                 resource_size_t n, const char *name);
     268                 :            : 
     269                 :            : #define devm_release_region(dev, start, n) \
     270                 :            :         __devm_release_region(dev, &ioport_resource, (start), (n))
     271                 :            : #define devm_release_mem_region(dev, start, n) \
     272                 :            :         __devm_release_region(dev, &iomem_resource, (start), (n))
     273                 :            : 
     274                 :            : extern void __devm_release_region(struct device *dev, struct resource *parent,
     275                 :            :                                   resource_size_t start, resource_size_t n);
     276                 :            : extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
     277                 :            : extern bool iomem_is_exclusive(u64 addr);
     278                 :            : 
     279                 :            : extern int
     280                 :            : walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
     281                 :            :                 void *arg, int (*func)(unsigned long, unsigned long, void *));
     282                 :            : extern int
     283                 :            : walk_mem_res(u64 start, u64 end, void *arg,
     284                 :            :              int (*func)(struct resource *, void *));
     285                 :            : extern int
     286                 :            : walk_system_ram_res(u64 start, u64 end, void *arg,
     287                 :            :                     int (*func)(struct resource *, void *));
     288                 :            : extern int
     289                 :            : walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
     290                 :            :                     void *arg, int (*func)(struct resource *, void *));
     291                 :            : 
     292                 :            : /* True if any part of r1 overlaps r2 */
     293                 :            : static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
     294                 :            : {
     295   [ #  #  #  # ]:          0 :        return (r1->start <= r2->end && r1->end >= r2->start);
     296                 :            : }
     297                 :            : 
     298                 :            : struct resource *devm_request_free_mem_region(struct device *dev,
     299                 :            :                 struct resource *base, unsigned long size);
     300                 :            : struct resource *request_free_mem_region(struct resource *base,
     301                 :            :                 unsigned long size, const char *name);
     302                 :            : 
     303                 :            : #ifdef CONFIG_IO_STRICT_DEVMEM
     304                 :            : void revoke_devmem(struct resource *res);
     305                 :            : #else
     306                 :            : static inline void revoke_devmem(struct resource *res) { };
     307                 :            : #endif
     308                 :            : 
     309                 :            : #endif /* __ASSEMBLY__ */
     310                 :            : #endif  /* _LINUX_IOPORT_H */

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