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#define __io_phys(x) ((unsigned long)(x) & ~PAGE_OFFSET) 23/* 24 * Change virtual addresses to physical addresses and vv. 25 * These are pretty trivial 26 */ 27extern inline unsigned long virt_to_phys(volatile void * address) 28{ 29 unsigned long real_address; 30 __asm__ (" lrag %0,0(%1)\n" 31 " jz 0f\n" 32 " slgr %0,%0\n" 33 "0:" 34 : "=a" (real_address) : "a" (address) : "cc" ); 35 return real_address; 36} 37 38extern inline void * phys_to_virt(unsigned long address) 39{ 40 return __io_virt(address); 41} 42 43extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags); 44 45extern inline void * ioremap (unsigned long offset, unsigned long size) 46{ 47 return __ioremap(offset, size, 0); 48} 49 50/* 51 * This one maps high address device memory and turns off caching for that area. 52 * it's useful if some control registers are in such an area and write combining 53 * or read caching is not desirable: 54 */ 55extern inline void * ioremap_nocache (unsigned long offset, unsigned long size) 56{ 57 return __ioremap(offset, size, 0); 58} 59 60extern void iounmap(void *addr); 61 62/* 63 * IO bus memory addresses are also 1:1 with the physical address 64 */ 65#define virt_to_bus virt_to_phys 66#define bus_to_virt phys_to_virt 67 68/* 69 * readX/writeX() are used to access memory mapped devices. On some 70 * architectures the memory mapped IO stuff needs to be accessed 71 * differently. 72 */ 73 74#define readb(addr) (*(volatile unsigned char *) __io_virt(addr)) 75#define readw(addr) (*(volatile unsigned short *) __io_virt(addr)) 76#define readl(addr) (*(volatile unsigned int *) __io_virt(addr)) 77 78#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b)) 79#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b)) 80#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b)) 81 82#define memset_io(a,b,c) memset(__io_virt(a),(b),(c)) 83#define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c)) 84#define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c)) 85 86#define inb_p(addr) readb(addr) 87#define inb(addr) readb(addr) 88 89#define outb(x,addr) ((void) writeb(x,addr)) 90#define outb_p(x,addr) outb(x,addr) 91 92#endif /* __KERNEL__ */ 93 94#endif 95