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 #ifndef __s390x__
  32                  "      lra     %0,0(%1)\n"
  33 #else /* __s390x__ */
  34                  "      lrag    %0,0(%1)\n"
  35 #endif /* __s390x__ */
  36                  "      jz      0f\n"
  37                  "      la      %0,0\n"
  38                  "0:"
  39                  : "=a" (real_address) : "a" (address) : "cc");
  40         return real_address;
  41 }
  42
  43 static inline void * phys_to_virt(unsigned long address)
  44 {
  45         return __io_virt(address);
  46 }
  47
  48 extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
  49
  50 static inline void * ioremap (unsigned long offset, unsigned long size)
  51 {
  52         return __ioremap(offset, size, 0);
  53 }
  54
  55 /*
  56  * This one maps high address device memory and turns off caching for that area.
  57  * it's useful if some control registers are in such an area and write combining
  58  * or read caching is not desirable:
  59  */
  60 static inline void * ioremap_nocache (unsigned long offset, unsigned long size)
  61 {
  62         return __ioremap(offset, size, 0);
  63 }
  64
  65 extern void iounmap(void *addr);
  66
  67 /*
  68  * IO bus memory addresses are also 1:1 with the physical address
  69  */
  70 #define virt_to_bus virt_to_phys
  71 #define bus_to_virt phys_to_virt
  72
  73 /*
  74  * readX/writeX() are used to access memory mapped devices. On some
  75  * architectures the memory mapped IO stuff needs to be accessed
  76  * differently.
  77  */
  78
  79 #define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
  80 #define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
  81 #define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
  82 #define readq(addr) (*(volatile unsigned long long *) __io_virt(addr))
  83
  84 #define readb_relaxed(addr) readb(addr)
  85 #define readw_relaxed(addr) readw(addr)
  86 #define readl_relaxed(addr) readl(addr)
  87 #define readq_relaxed(addr) readq(addr)
  88 #define __raw_readb readb
  89 #define __raw_readw readw
  90 #define __raw_readl readl
  91 #define __raw_readq readq
  92
  93 #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
  94 #define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
  95 #define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
  96 #define writeq(b,addr) (*(volatile unsigned long long *) __io_virt(addr) = (b))
  97 #define __raw_writeb writeb
  98 #define __raw_writew writew
  99 #define __raw_writel writel
 100 #define __raw_writeq writeq
 101
 102 #define memset_io(a,b,c)        memset(__io_virt(a),(b),(c))
 103 #define memcpy_fromio(a,b,c)    memcpy((a),__io_virt(b),(c))
 104 #define memcpy_toio(a,b,c)      memcpy(__io_virt(a),(b),(c))
 105
 106 #define inb_p(addr) readb(addr)
 107 #define inb(addr) readb(addr)
 108
 109 #define outb(x,addr) ((void) writeb(x,addr))
 110 #define outb_p(x,addr) outb(x,addr)
 111
 112 #define mmiowb()        do { } while (0)
 113
 114 /*
 115  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 116  * access
 117  */
 118 #define xlate_dev_mem_ptr(p)    __va(p)
 119
 120 /*
 121  * Convert a virtual cached pointer to an uncached pointer
 122  */
 123 #define xlate_dev_kmem_ptr(p)   p
 124
 125 #endif /* __KERNEL__ */
 126
 127 #endif