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