LCOV - code coverage report
Current view: top level - include/linux - io.h (source / functions) Hit Total Coverage
Test: combined.info Lines: 0 2 0.0 %
Date: 2022-04-01 14:35:51 Functions: 0 0 -
Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0-only */
       2                 :            : /*
       3                 :            :  * Copyright 2006 PathScale, Inc.  All Rights Reserved.
       4                 :            :  */
       5                 :            : 
       6                 :            : #ifndef _LINUX_IO_H
       7                 :            : #define _LINUX_IO_H
       8                 :            : 
       9                 :            : #include <linux/types.h>
      10                 :            : #include <linux/init.h>
      11                 :            : #include <linux/bug.h>
      12                 :            : #include <linux/err.h>
      13                 :            : #include <asm/io.h>
      14                 :            : #include <asm/page.h>
      15                 :            : 
      16                 :            : struct device;
      17                 :            : struct resource;
      18                 :            : 
      19                 :            : __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
      20                 :            : void __ioread32_copy(void *to, const void __iomem *from, size_t count);
      21                 :            : void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
      22                 :            : 
      23                 :            : #ifdef CONFIG_MMU
      24                 :            : int ioremap_page_range(unsigned long addr, unsigned long end,
      25                 :            :                        phys_addr_t phys_addr, pgprot_t prot);
      26                 :            : #else
      27                 :            : static inline int ioremap_page_range(unsigned long addr, unsigned long end,
      28                 :            :                                      phys_addr_t phys_addr, pgprot_t prot)
      29                 :            : {
      30                 :            :         return 0;
      31                 :            : }
      32                 :            : #endif
      33                 :            : 
      34                 :            : #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
      35                 :            : void __init ioremap_huge_init(void);
      36                 :            : int arch_ioremap_p4d_supported(void);
      37                 :            : int arch_ioremap_pud_supported(void);
      38                 :            : int arch_ioremap_pmd_supported(void);
      39                 :            : #else
      40                 :            : static inline void ioremap_huge_init(void) { }
      41                 :            : #endif
      42                 :            : 
      43                 :            : /*
      44                 :            :  * Managed iomap interface
      45                 :            :  */
      46                 :            : #ifdef CONFIG_HAS_IOPORT_MAP
      47                 :            : void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
      48                 :            :                                unsigned int nr);
      49                 :            : void devm_ioport_unmap(struct device *dev, void __iomem *addr);
      50                 :            : #else
      51                 :            : static inline void __iomem *devm_ioport_map(struct device *dev,
      52                 :            :                                              unsigned long port,
      53                 :            :                                              unsigned int nr)
      54                 :            : {
      55                 :            :         return NULL;
      56                 :            : }
      57                 :            : 
      58                 :            : static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
      59                 :            : {
      60                 :            : }
      61                 :            : #endif
      62                 :            : 
      63                 :            : #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
      64                 :            : 
      65                 :            : void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
      66                 :            :                            resource_size_t size);
      67                 :            : void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
      68                 :            :                                    resource_size_t size);
      69                 :            : void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
      70                 :            :                                    resource_size_t size);
      71                 :            : void devm_iounmap(struct device *dev, void __iomem *addr);
      72                 :            : int check_signature(const volatile void __iomem *io_addr,
      73                 :            :                         const unsigned char *signature, int length);
      74                 :            : void devm_ioremap_release(struct device *dev, void *res);
      75                 :            : 
      76                 :            : void *devm_memremap(struct device *dev, resource_size_t offset,
      77                 :            :                 size_t size, unsigned long flags);
      78                 :            : void devm_memunmap(struct device *dev, void *addr);
      79                 :            : 
      80                 :            : void *__devm_memremap_pages(struct device *dev, struct resource *res);
      81                 :            : 
      82                 :            : #ifdef CONFIG_PCI
      83                 :            : /*
      84                 :            :  * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
      85                 :            :  * Posting") mandate non-posted configuration transactions. There is
      86                 :            :  * no ioremap API in the kernel that can guarantee non-posted write
      87                 :            :  * semantics across arches so provide a default implementation for
      88                 :            :  * mapping PCI config space that defaults to ioremap(); arches
      89                 :            :  * should override it if they have memory mapping implementations that
      90                 :            :  * guarantee non-posted writes semantics to make the memory mapping
      91                 :            :  * compliant with the PCI specification.
      92                 :            :  */
      93                 :            : #ifndef pci_remap_cfgspace
      94                 :            : #define pci_remap_cfgspace pci_remap_cfgspace
      95                 :          0 : static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset,
      96                 :            :                                                size_t size)
      97                 :            : {
      98                 :          0 :         return ioremap(offset, size);
      99                 :            : }
     100                 :            : #endif
     101                 :            : #endif
     102                 :            : 
     103                 :            : /*
     104                 :            :  * Some systems do not have legacy ISA devices.
     105                 :            :  * /dev/port is not a valid interface on these systems.
     106                 :            :  * So for those archs, <asm/io.h> should define the following symbol.
     107                 :            :  */
     108                 :            : #ifndef arch_has_dev_port
     109                 :            : #define arch_has_dev_port()     (1)
     110                 :            : #endif
     111                 :            : 
     112                 :            : /*
     113                 :            :  * Some systems (x86 without PAT) have a somewhat reliable way to mark a
     114                 :            :  * physical address range such that uncached mappings will actually
     115                 :            :  * end up write-combining.  This facility should be used in conjunction
     116                 :            :  * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
     117                 :            :  * no effect if the per-page mechanisms are functional.
     118                 :            :  * (On x86 without PAT, these functions manipulate MTRRs.)
     119                 :            :  *
     120                 :            :  * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
     121                 :            :  * to have no effect.
     122                 :            :  */
     123                 :            : #ifndef arch_phys_wc_add
     124                 :            : static inline int __must_check arch_phys_wc_add(unsigned long base,
     125                 :            :                                                 unsigned long size)
     126                 :            : {
     127                 :            :         return 0;  /* It worked (i.e. did nothing). */
     128                 :            : }
     129                 :            : 
     130                 :            : static inline void arch_phys_wc_del(int handle)
     131                 :            : {
     132                 :            : }
     133                 :            : 
     134                 :            : #define arch_phys_wc_add arch_phys_wc_add
     135                 :            : #ifndef arch_phys_wc_index
     136                 :            : static inline int arch_phys_wc_index(int handle)
     137                 :            : {
     138                 :            :         return -1;
     139                 :            : }
     140                 :            : #define arch_phys_wc_index arch_phys_wc_index
     141                 :            : #endif
     142                 :            : #endif
     143                 :            : 
     144                 :            : enum {
     145                 :            :         /* See memremap() kernel-doc for usage description... */
     146                 :            :         MEMREMAP_WB = 1 << 0,
     147                 :            :         MEMREMAP_WT = 1 << 1,
     148                 :            :         MEMREMAP_WC = 1 << 2,
     149                 :            :         MEMREMAP_ENC = 1 << 3,
     150                 :            :         MEMREMAP_DEC = 1 << 4,
     151                 :            : };
     152                 :            : 
     153                 :            : void *memremap(resource_size_t offset, size_t size, unsigned long flags);
     154                 :            : void memunmap(void *addr);
     155                 :            : 
     156                 :            : /*
     157                 :            :  * On x86 PAT systems we have memory tracking that keeps track of
     158                 :            :  * the allowed mappings on memory ranges. This tracking works for
     159                 :            :  * all the in-kernel mapping APIs (ioremap*), but where the user
     160                 :            :  * wishes to map a range from a physical device into user memory
     161                 :            :  * the tracking won't be updated. This API is to be used by
     162                 :            :  * drivers which remap physical device pages into userspace,
     163                 :            :  * and wants to make sure they are mapped WC and not UC.
     164                 :            :  */
     165                 :            : #ifndef arch_io_reserve_memtype_wc
     166                 :            : static inline int arch_io_reserve_memtype_wc(resource_size_t base,
     167                 :            :                                              resource_size_t size)
     168                 :            : {
     169                 :            :         return 0;
     170                 :            : }
     171                 :            : 
     172                 :            : static inline void arch_io_free_memtype_wc(resource_size_t base,
     173                 :            :                                            resource_size_t size)
     174                 :            : {
     175                 :            : }
     176                 :            : #endif
     177                 :            : 
     178                 :            : #endif /* _LINUX_IO_H */

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