2 * include/asm-s390/io.h
5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
8 * Derived from "include/asm-i386/io.h"
16 #include <linux/vmalloc.h>
19 #define IO_SPACE_LIMIT 0xffffffff
21 #define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x)))
22 #define __io_phys(x) ((unsigned long)(x) & ~PAGE_OFFSET)
24 * Change virtual addresses to physical addresses and vv.
25 * These are pretty trivial
27 extern inline unsigned long virt_to_phys(volatile void * address)
29 unsigned long real_address;
30 __asm__ (" lra %0,0(%1)\n"
34 : "=a" (real_address) : "a" (address) : "cc" );
38 extern inline void * phys_to_virt(unsigned long address)
40 return __io_virt(address);
44 * Change "struct page" to physical address.
46 #define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
48 extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
50 extern inline void * ioremap (unsigned long offset, unsigned long size)
52 return __ioremap(offset, size, 0);
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:
60 extern inline void * ioremap_nocache (unsigned long offset, unsigned long size)
62 return __ioremap(offset, size, 0);
65 extern void iounmap(void *addr);
68 * IO bus memory addresses are also 1:1 with the physical address
70 #define virt_to_bus virt_to_phys
71 #define bus_to_virt phys_to_virt
74 * readX/writeX() are used to access memory mapped devices. On some
75 * architectures the memory mapped IO stuff needs to be accessed
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))
83 #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
84 #define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
85 #define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
87 #define memset_io(a,b,c) memset(__io_virt(a),(b),(c))
88 #define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c))
89 #define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c))
91 #define inb_p(addr) readb(addr)
92 #define inb(addr) readb(addr)
94 #define outb(x,addr) ((void) writeb(x,addr))
95 #define outb_p(x,addr) outb(x,addr)
97 #endif /* __KERNEL__ */