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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.  */
  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.  
  33. #ifndef ioread32
  34. #define ioread32 ioread32
  35. static inline u32 ioread32(const volatile void __iomem *addr)
  36. {
  37.     return readl(addr);
  38. }
  39. #endif
  40.  
  41. extern unsigned int ioread32be(void __iomem *);
  42.  
  43. extern void iowrite8(u8, void __iomem *);
  44. extern void iowrite16(u16, void __iomem *);
  45. extern void iowrite16be(u16, void __iomem *);
  46. //extern void iowrite32(u32, void __iomem *);
  47. #ifndef iowrite32
  48. //#define iowrite32 iowrite32
  49. static inline void iowrite32(u32 value, volatile void __iomem *addr)
  50. {
  51.     writel(value, addr);
  52. }
  53. #endif
  54.  
  55. extern void iowrite32be(u32, void __iomem *);
  56.  
  57. /*
  58.  * "string" versions of the above. Note that they
  59.  * use native byte ordering for the accesses (on
  60.  * the assumption that IO and memory agree on a
  61.  * byte order, and CPU byteorder is irrelevant).
  62.  *
  63.  * They do _not_ update the port address. If you
  64.  * want MMIO that copies stuff laid out in MMIO
  65.  * memory across multiple ports, use "memcpy_toio()"
  66.  * and friends.
  67.  */
  68. extern void ioread8_rep(void __iomem *port, void *buf, unsigned long count);
  69. extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count);
  70. extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count);
  71.  
  72. extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
  73. extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
  74. extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);
  75.  
  76. #ifdef CONFIG_HAS_IOPORT_MAP
  77. /* Create a virtual mapping cookie for an IO port range */
  78. extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
  79. extern void ioport_unmap(void __iomem *);
  80. #endif
  81.  
  82. #ifndef ARCH_HAS_IOREMAP_WC
  83. #define ioremap_wc ioremap_nocache
  84. #endif
  85.  
  86. #ifndef ARCH_HAS_IOREMAP_WT
  87. #define ioremap_wt ioremap_nocache
  88. #endif
  89.  
  90. #ifdef CONFIG_PCI
  91. /* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */
  92. struct pci_dev;
  93. extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
  94. #elif defined(CONFIG_GENERIC_IOMAP)
  95. struct pci_dev;
  96. static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
  97. { }
  98. #endif
  99.  
  100. #include <asm-generic/pci_iomap.h>
  101.  
  102. #endif
  103.