include/asm-s390/io.h

   1 /*
   2  *  include/asm-s390/io.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
   7  *
   8  *  Derived from "include/asm-i386/io.h"
   9  */
  10
  11 #ifndef _S390_IO_H
  12 #define _S390_IO_H
  13
  14 #ifdef __KERNEL__
  15
  16 #include <linux/vmalloc.h>
  17 #include <asm/page.h>
  18
  19 #define IO_SPACE_LIMIT 0xffffffff
  20
  21 #define __io_virt(x)            ((void *)(PAGE_OFFSET | (unsigned long)(x)))
  22
  23 /*
  24  * Change virtual addresses to physical addresses and vv.
  25  * These are pretty trivial
  26  */
  27 static inline unsigned long virt_to_phys(volatile void * address)
  28 {
  29         unsigned long real_address;
  30         asm volatile(
  31                  "      lra     %0,0(%1)\n"
  32                  "      jz      0f\n"
  33                  "      la      %0,0\n"
  34                  "0:"
  35                  : "=a" (real_address) : "a" (address) : "cc");
  36         return real_address;
  37 }
  38
  39 static inline void * phys_to_virt(unsigned long address)
  40 {
  41         return __io_virt(address);
  42 }
  43
  44 extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
  45
  46 static inline void * ioremap (unsigned long offset, unsigned long size)
  47 {
  48         return __ioremap(offset, size, 0);
  49 }
  50
  51 /*
  52  * This one maps high address device memory and turns off caching for that area.
  53  * it's useful if some control registers are in such an area and write combining
  54  * or read caching is not desirable:
  55  */
  56 static inline void * ioremap_nocache (unsigned long offset, unsigned long size)
  57 {
  58         return __ioremap(offset, size, 0);
  59 }
  60
  61 extern void iounmap(void *addr);
  62
  63 /*
  64  * IO bus memory addresses are also 1:1 with the physical address
  65  */
  66 #define virt_to_bus virt_to_phys
  67 #define bus_to_virt phys_to_virt
  68
  69 /*
  70  * readX/writeX() are used to access memory mapped devices. On some
  71  * architectures the memory mapped IO stuff needs to be accessed
  72  * differently.
  73  */
  74
  75 #define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
  76 #define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
  77 #define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
  78 #define readq(addr) (*(volatile unsigned long long *) __io_virt(addr))
  79
  80 #define readb_relaxed(addr) readb(addr)
  81 #define readw_relaxed(addr) readw(addr)
  82 #define readl_relaxed(addr) readl(addr)
  83 #define readq_relaxed(addr) readq(addr)
  84 #define __raw_readb readb
  85 #define __raw_readw readw
  86 #define __raw_readl readl
  87 #define __raw_readq readq
  88
  89 #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
  90 #define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
  91 #define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
  92 #define writeq(b,addr) (*(volatile unsigned long long *) __io_virt(addr) = (b))
  93 #define __raw_writeb writeb
  94 #define __raw_writew writew
  95 #define __raw_writel writel
  96 #define __raw_writeq writeq
  97
  98 #define memset_io(a,b,c)        memset(__io_virt(a),(b),(c))
  99 #define memcpy_fromio(a,b,c)    memcpy((a),__io_virt(b),(c))
 100 #define memcpy_toio(a,b,c)      memcpy(__io_virt(a),(b),(c))
 101
 102 #define inb_p(addr) readb(addr)
 103 #define inb(addr) readb(addr)
 104
 105 #define outb(x,addr) ((void) writeb(x,addr))
 106 #define outb_p(x,addr) outb(x,addr)
 107
 108 #define mmiowb()        do { } while (0)
 109
 110 /*
 111  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 112  * access
 113  */
 114 #define xlate_dev_mem_ptr(p)    __va(p)
 115
 116 /*
 117  * Convert a virtual cached pointer to an uncached pointer
 118  */
 119 #define xlate_dev_kmem_ptr(p)   p
 120
 121 #endif /* __KERNEL__ */
 122
 123 #endif