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