include/asm-generic/iomap.h

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