Subversion Repositories or1k

/*

 *  include/asm-s390/io.h

 *

 *  S390 version

 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation

 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)

 *

 *  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)))

#define __io_phys(x)            ((unsigned long)(x) & ~PAGE_OFFSET)

/*

 * Change virtual addresses to physical addresses and vv.

 * These are pretty trivial

 */

extern inline unsigned long virt_to_phys(volatile void * address)

{

        unsigned long real_address;

        __asm__ ("   lra    %0,0(%1)\n"

                 "   jz     0f\n"

                 "   sr     %0,%0\n"

                 "0:"

                 : "=a" (real_address) : "a" (address) : "cc" );

        return real_address;

}

extern 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);

extern 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:

 */

extern 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 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 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)

#endif /* __KERNEL__ */

#endif