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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/asm-s390/io.h
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)))
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
;
39 #endif /* __s390x__ */
41 : "=a" (real_address
) : "a" (address
) : "cc" );
45 extern inline void * phys_to_virt(unsigned long address
)
47 return __io_virt(address
);
51 * Change "struct page" to physical address.
53 #define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
55 extern void * __ioremap(unsigned long offset
, unsigned long size
, unsigned long flags
);
57 extern inline void * ioremap (unsigned long offset
, unsigned long size
)
59 return __ioremap(offset
, size
, 0);
63 * This one maps high address device memory and turns off caching for that area.
64 * it's useful if some control registers are in such an area and write combining
65 * or read caching is not desirable:
67 extern inline void * ioremap_nocache (unsigned long offset
, unsigned long size
)
69 return __ioremap(offset
, size
, 0);
72 extern void iounmap(void *addr
);
75 * IO bus memory addresses are also 1:1 with the physical address
77 #define virt_to_bus virt_to_phys
78 #define bus_to_virt phys_to_virt
81 * readX/writeX() are used to access memory mapped devices. On some
82 * architectures the memory mapped IO stuff needs to be accessed
86 #define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
87 #define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
88 #define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
90 #define readb_relaxed(addr) readb(addr)
91 #define readw_relaxed(addr) readw(addr)
92 #define readl_relaxed(addr) readl(addr)
94 #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
95 #define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
96 #define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
98 #define memset_io(a,b,c) memset(__io_virt(a),(b),(c))
99 #define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c))
100 #define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c))
102 #define inb_p(addr) readb(addr)
103 #define inb(addr) readb(addr)
105 #define outb(x,addr) ((void) writeb(x,addr))
106 #define outb_p(x,addr) outb(x,addr)
111 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
114 #define xlate_dev_mem_ptr(p) __va(p)
117 * Convert a virtual cached pointer to an uncached pointer
119 #define xlate_dev_kmem_ptr(p) p
121 #endif /* __KERNEL__ */