include/asm-generic/iomap.h

   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  */
  28 extern unsigned int ioread8(void __iomem *);
  29 extern unsigned int ioread16(void __iomem *);
  30 extern unsigned int ioread16be(void __iomem *);
  31 extern unsigned int ioread32(void __iomem *);
  32 extern unsigned int ioread32be(void __iomem *);
  33 #ifdef CONFIG_64BIT
  34 extern u64 ioread64(void __iomem *);
  35 extern u64 ioread64be(void __iomem *);
  36 #endif
  37
  38 extern void iowrite8(u8, void __iomem *);
  39 extern void iowrite16(u16, void __iomem *);
  40 extern void iowrite16be(u16, void __iomem *);
  41 extern void iowrite32(u32, void __iomem *);
  42 extern void iowrite32be(u32, void __iomem *);
  43 #ifdef CONFIG_64BIT
  44 extern void iowrite64(u64, void __iomem *);
  45 extern void iowrite64be(u64, void __iomem *);
  46 #endif
  47
  48 /*
  49  * "string" versions of the above. Note that they
  50  * use native byte ordering for the accesses (on
  51  * the assumption that IO and memory agree on a
  52  * byte order, and CPU byteorder is irrelevant).
  53  *
  54  * They do _not_ update the port address. If you
  55  * want MMIO that copies stuff laid out in MMIO
  56  * memory across multiple ports, use "memcpy_toio()"
  57  * and friends.
  58  */
  59 extern void ioread8_rep(void __iomem *port, void *buf, unsigned long count);
  60 extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count);
  61 extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count);
  62
  63 extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
  64 extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
  65 extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);
  66
  67 #ifdef CONFIG_HAS_IOPORT_MAP
  68 /* Create a virtual mapping cookie for an IO port range */
  69 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
  70 extern void ioport_unmap(void __iomem *);
  71 #endif
  72
  73 #ifndef ARCH_HAS_IOREMAP_WC
  74 #define ioremap_wc ioremap_nocache
  75 #endif
  76
  77 #ifndef ARCH_HAS_IOREMAP_WT
  78 #define ioremap_wt ioremap_nocache
  79 #endif
  80
  81 #ifdef CONFIG_PCI
  82 /* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */
  83 struct pci_dev;
  84 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
  85 #elif defined(CONFIG_GENERIC_IOMAP)
  86 struct pci_dev;
  87 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
  88 { }
  89 #endif
  90
  91 #include <asm-generic/pci_iomap.h>
  92
  93 #endif