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 extern inline unsigned long virt_to_phys(volatile void * address)
  28 {
  29         unsigned long real_address;
  30         __asm__ (
  31 #ifndef __s390x__
  32                  "   lra    %0,0(%1)\n"
  33                  "   jz     0f\n"
  34                  "   sr     %0,%0\n"
  35 #else /* __s390x__ */
  36                  "   lrag   %0,0(%1)\n"
  37                  "   jz     0f\n"
  38                  "   slgr   %0,%0\n"
  39 #endif /* __s390x__ */
  40                  "0:"
  41                  : "=a" (real_address) : "a" (address) : "cc" );
  42         return real_address;
  43 }
  44
  45 extern inline void * phys_to_virt(unsigned long address)
  46 {
  47         return __io_virt(address);
  48 }
  49
  50 /*
  51  * Change "struct page" to physical address.
  52  */
  53 #define page_to_phys(page)      ((page - mem_map) << PAGE_SHIFT)
  54
  55 extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
  56
  57 extern inline void * ioremap (unsigned long offset, unsigned long size)
  58 {
  59         return __ioremap(offset, size, 0);
  60 }
  61
  62 /*
  63  * This one maps high address device memory and turns off caching for that area.
  64  * it's useful if some control registers are in such an area and write combining
  65  * or read caching is not desirable:
  66  */
  67 extern inline void * ioremap_nocache (unsigned long offset, unsigned long size)
  68 {
  69         return __ioremap(offset, size, 0);
  70 }
  71
  72 extern void iounmap(void *addr);
  73
  74 /*
  75  * IO bus memory addresses are also 1:1 with the physical address
  76  */
  77 #define virt_to_bus virt_to_phys
  78 #define bus_to_virt phys_to_virt
  79
  80 /*
  81  * readX/writeX() are used to access memory mapped devices. On some
  82  * architectures the memory mapped IO stuff needs to be accessed
  83  * differently.
  84  */
  85
  86 #define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
  87 #define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
  88 #define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
  89
  90 #define readb_relaxed(addr) readb(addr)
  91 #define readw_relaxed(addr) readw(addr)
  92 #define readl_relaxed(addr) readl(addr)
  93
  94 #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
  95 #define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
  96 #define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
  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 #endif /* __KERNEL__ */
 109
 110 #endif