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
  34 extern void iowrite8(u8, void __iomem *);
  35 extern void iowrite16(u16, void __iomem *);
  36 extern void iowrite16be(u16, void __iomem *);
  37 extern void iowrite32(u32, void __iomem *);
  38 extern 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  */
  51 extern void ioread8_rep(void __iomem *port, void *buf, unsigned long count);
  52 extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count);
  53 extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count);
  54
  55 extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
  56 extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
  57 extern 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 */
  61 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
  62 extern 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 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
  71 struct pci_dev;
  72 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
  73 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
  74 #else
  75 struct pci_dev;
  76 static inline void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max)
  77 {
  78         return NULL;
  79 }
  80 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
  81 { }
  82 #endif
  83
  84 #endif