blob: b05825dd16d7043d3e578d515433e1ceda0b124f [file] [log] [blame]
* include/asm-s390/io.h
* S390 version
* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky (
* Derived from "include/asm-i386/io.h"
#ifndef _S390_IO_H
#define _S390_IO_H
#ifdef __KERNEL__
#include <linux/vmalloc.h>
#include <asm/page.h>
#define IO_SPACE_LIMIT 0xffffffff
#define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x)))
* Change virtual addresses to physical addresses and vv.
* These are pretty trivial
static inline unsigned long virt_to_phys(volatile void * address)
unsigned long real_address;
__asm__ (
#ifndef __s390x__
" lra %0,0(%1)\n"
" jz 0f\n"
" sr %0,%0\n"
#else /* __s390x__ */
" lrag %0,0(%1)\n"
" jz 0f\n"
" slgr %0,%0\n"
#endif /* __s390x__ */
: "=a" (real_address) : "a" (address) : "cc" );
return real_address;
static inline void * phys_to_virt(unsigned long address)
return __io_virt(address);
* Change "struct page" to physical address.
#define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
static inline void * ioremap (unsigned long offset, unsigned long size)
return __ioremap(offset, size, 0);
* This one maps high address device memory and turns off caching for that area.
* it's useful if some control registers are in such an area and write combining
* or read caching is not desirable:
static inline void * ioremap_nocache (unsigned long offset, unsigned long size)
return __ioremap(offset, size, 0);
extern void iounmap(void *addr);
* IO bus memory addresses are also 1:1 with the physical address
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt
* readX/writeX() are used to access memory mapped devices. On some
* architectures the memory mapped IO stuff needs to be accessed
* differently.
#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
#define readb_relaxed(addr) readb(addr)
#define readw_relaxed(addr) readw(addr)
#define readl_relaxed(addr) readl(addr)
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
#define __raw_writeb writeb
#define __raw_writew writew
#define __raw_writel writel
#define memset_io(a,b,c) memset(__io_virt(a),(b),(c))
#define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c))
#define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c))
#define inb_p(addr) readb(addr)
#define inb(addr) readb(addr)
#define outb(x,addr) ((void) writeb(x,addr))
#define outb_p(x,addr) outb(x,addr)
#define mmiowb()
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
#define xlate_dev_mem_ptr(p) __va(p)
* Convert a virtual cached pointer to an uncached pointer
#define xlate_dev_kmem_ptr(p) p
#endif /* __KERNEL__ */