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 #define __io_phys(x)            ((unsigned long)(x) & ~PAGE_OFFSET)
  23 /*
  24  * Change virtual addresses to physical addresses and vv.
  25  * These are pretty trivial
  26  */
  27 extern inline unsigned long virt_to_phys(volatile void * address)
  28 {
  29         unsigned long real_address;
  30         __asm__ ("   lra    %0,0(0,%1)\n"
  31                  "   jz     0f\n"
  32                  "   sr     %0,%0\n"
  33                  "0:"
  34                  : "=a" (real_address) : "a" (address) );
  35         return real_address;
  36 }
  37
  38 extern inline void * phys_to_virt(unsigned long address)
  39 {
  40         return __io_virt(address);
  41 }
  42
  43 extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
  44
  45 extern inline void * ioremap (unsigned long offset, unsigned long size)
  46 {
  47         return __ioremap(offset, size, 0);
  48 }
  49
  50 /*
  51  * This one maps high address device memory and turns off caching for that area.
  52  * it's useful if some control registers are in such an area and write combining
  53  * or read caching is not desirable:
  54  */
  55 extern inline void * ioremap_nocache (unsigned long offset, unsigned long size)
  56 {
  57         return __ioremap(offset, size, 0);
  58 }
  59
  60 extern void iounmap(void *addr);
  61
  62 /*
  63  * IO bus memory addresses are also 1:1 with the physical address
  64  */
  65 #define virt_to_bus virt_to_phys
  66 #define bus_to_virt phys_to_virt
  67
  68 /*
  69  * readX/writeX() are used to access memory mapped devices. On some
  70  * architectures the memory mapped IO stuff needs to be accessed
  71  * differently.
  72  */
  73
  74 #define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
  75 #define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
  76 #define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
  77
  78 #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
  79 #define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
  80 #define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
  81
  82 #define memset_io(a,b,c)        memset(__io_virt(a),(b),(c))
  83 #define memcpy_fromio(a,b,c)    memcpy((a),__io_virt(b),(c))
  84 #define memcpy_toio(a,b,c)      memcpy(__io_virt(a),(b),(c))
  85
  86 #define inb_p(addr) readb(addr)
  87 #define inb(addr) readb(addr)
  88
  89 #define outb(x,addr) ((void) writeb(x,addr))
  90 #define outb_p(x,addr) outb(x,addr)
  91
  92 #endif /* __KERNEL__ */
  93
  94 #endif