include/asm-generic/iomap.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __GENERIC_IO_H
   3 #define __GENERIC_IO_H
   4
   5 #include <linux/linkage.h>
   6 #include <asm/byteorder.h>
   7
   8 /*
   9  * These are the "generic" interfaces for doing new-style
  10  * memory-mapped or PIO accesses. Architectures may do
  11  * their own arch-optimized versions, these just act as
  12  * wrappers around the old-style IO register access functions:
  13  * read[bwl]/write[bwl]/in[bwl]/out[bwl]
  14  *
  15  * Don't include this directly, include it from <asm/io.h>.
  16  */
  17
  18 /*
  19  * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
  20  * access or a MMIO access, these functions don't care. The info is
  21  * encoded in the hardware mapping set up by the mapping functions
  22  * (or the cookie itself, depending on implementation and hw).
  23  *
  24  * The generic routines just encode the PIO/MMIO as part of the
  25  * cookie, and coldly assume that the MMIO IO mappings are not
  26  * in the low address range. Architectures for which this is not
  27  * true can't use this generic implementation.
  28  */
  29 extern unsigned int ioread8(void __iomem *);
  30 extern unsigned int ioread16(void __iomem *);
  31 extern unsigned int ioread16be(void __iomem *);
  32 extern unsigned int ioread32(void __iomem *);
  33 extern unsigned int ioread32be(void __iomem *);
  34 #ifdef CONFIG_64BIT
  35 extern u64 ioread64(void __iomem *);
  36 extern u64 ioread64be(void __iomem *);
  37 #endif
  38
  39 extern void iowrite8(u8, void __iomem *);
  40 extern void iowrite16(u16, void __iomem *);
  41 extern void iowrite16be(u16, void __iomem *);
  42 extern void iowrite32(u32, void __iomem *);
  43 extern void iowrite32be(u32, void __iomem *);
  44 #ifdef CONFIG_64BIT
  45 extern void iowrite64(u64, void __iomem *);
  46 extern void iowrite64be(u64, void __iomem *);
  47 #endif
  48
  49 /*
  50  * "string" versions of the above. Note that they
  51  * use native byte ordering for the accesses (on
  52  * the assumption that IO and memory agree on a
  53  * byte order, and CPU byteorder is irrelevant).
  54  *
  55  * They do _not_ update the port address. If you
  56  * want MMIO that copies stuff laid out in MMIO
  57  * memory across multiple ports, use "memcpy_toio()"
  58  * and friends.
  59  */
  60 extern void ioread8_rep(void __iomem *port, void *buf, unsigned long count);
  61 extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count);
  62 extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count);
  63
  64 extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
  65 extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
  66 extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);
  67
  68 #ifdef CONFIG_HAS_IOPORT_MAP
  69 /* Create a virtual mapping cookie for an IO port range */
  70 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
  71 extern void ioport_unmap(void __iomem *);
  72 #endif
  73
  74 #ifndef ARCH_HAS_IOREMAP_WC
  75 #define ioremap_wc ioremap_nocache
  76 #endif
  77
  78 #ifndef ARCH_HAS_IOREMAP_WT
  79 #define ioremap_wt ioremap_nocache
  80 #endif
  81
  82 #ifdef CONFIG_PCI
  83 /* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */
  84 struct pci_dev;
  85 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
  86 #elif defined(CONFIG_GENERIC_IOMAP)
  87 struct pci_dev;
  88 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
  89 { }
  90 #endif
  91
  92 #include <asm-generic/pci_iomap.h>
  93
  94 #endif