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 /*
  49  * Change "struct page" to physical address.
  50  */
  51 #define page_to_phys(page)      ((page - mem_map) << PAGE_SHIFT)
  52
  53 extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
  54
  55 static inline void * ioremap (unsigned long offset, unsigned long size)
  56 {
  57         return __ioremap(offset, size, 0);
  58 }
  59
  60 /*
  61  * This one maps high address device memory and turns off caching for that area.
  62  * it's useful if some control registers are in such an area and write combining
  63  * or read caching is not desirable:
  64  */
  65 static inline void * ioremap_nocache (unsigned long offset, unsigned long size)
  66 {
  67         return __ioremap(offset, size, 0);
  68 }
  69
  70 extern void iounmap(void *addr);
  71
  72 /*
  73  * IO bus memory addresses are also 1:1 with the physical address
  74  */
  75 #define virt_to_bus virt_to_phys
  76 #define bus_to_virt phys_to_virt
  77
  78 /*
  79  * readX/writeX() are used to access memory mapped devices. On some
  80  * architectures the memory mapped IO stuff needs to be accessed
  81  * differently.
  82  */
  83
  84 #define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
  85 #define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
  86 #define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
  87 #define readq(addr) (*(volatile unsigned long long *) __io_virt(addr))
  88
  89 #define readb_relaxed(addr) readb(addr)
  90 #define readw_relaxed(addr) readw(addr)
  91 #define readl_relaxed(addr) readl(addr)
  92 #define readq_relaxed(addr) readq(addr)
  93 #define __raw_readb readb
  94 #define __raw_readw readw
  95 #define __raw_readl readl
  96 #define __raw_readq readq
  97
  98 #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
  99 #define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
 100 #define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
 101 #define writeq(b,addr) (*(volatile unsigned long long *) __io_virt(addr) = (b))
 102 #define __raw_writeb writeb
 103 #define __raw_writew writew
 104 #define __raw_writel writel
 105 #define __raw_writeq writeq
 106
 107 #define memset_io(a,b,c)        memset(__io_virt(a),(b),(c))
 108 #define memcpy_fromio(a,b,c)    memcpy((a),__io_virt(b),(c))
 109 #define memcpy_toio(a,b,c)      memcpy(__io_virt(a),(b),(c))
 110
 111 #define inb_p(addr) readb(addr)
 112 #define inb(addr) readb(addr)
 113
 114 #define outb(x,addr) ((void) writeb(x,addr))
 115 #define outb_p(x,addr) outb(x,addr)
 116
 117 #define mmiowb()        do { } while (0)
 118
 119 /*
 120  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 121  * access
 122  */
 123 #define xlate_dev_mem_ptr(p)    __va(p)
 124
 125 /*
 126  * Convert a virtual cached pointer to an uncached pointer
 127  */
 128 #define xlate_dev_kmem_ptr(p)   p
 129
 130 #endif /* __KERNEL__ */
 131
 132 #endif