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/arch/xtensa/include/asm/io.h

https://bitbucket.org/ndreys/linux-sunxi
C++ Header | 207 lines | 133 code | 34 blank | 40 comment | 4 complexity | e0e648abf955731668920a9b62152db2 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * include/asm-xtensa/io.h
  3 *
  4 * This file is subject to the terms and conditions of the GNU General Public
  5 * License.  See the file "COPYING" in the main directory of this archive
  6 * for more details.
  7 *
  8 * Copyright (C) 2001 - 2005 Tensilica Inc.
  9 */
 10
 11#ifndef _XTENSA_IO_H
 12#define _XTENSA_IO_H
 13
 14#ifdef __KERNEL__
 15#include <asm/byteorder.h>
 16#include <asm/page.h>
 17#include <linux/kernel.h>
 18
 19#include <linux/types.h>
 20
 21#define XCHAL_KIO_CACHED_VADDR	0xe0000000
 22#define XCHAL_KIO_BYPASS_VADDR	0xf0000000
 23#define XCHAL_KIO_PADDR		0xf0000000
 24#define XCHAL_KIO_SIZE		0x10000000
 25
 26#define IOADDR(x)		(XCHAL_KIO_BYPASS_VADDR + (x))
 27
 28/*
 29 * swap functions to change byte order from little-endian to big-endian and
 30 * vice versa.
 31 */
 32
 33static inline unsigned short _swapw (unsigned short v)
 34{
 35	return (v << 8) | (v >> 8);
 36}
 37
 38static inline unsigned int _swapl (unsigned int v)
 39{
 40	return (v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24);
 41}
 42
 43/*
 44 * Change virtual addresses to physical addresses and vv.
 45 * These are trivial on the 1:1 Linux/Xtensa mapping
 46 */
 47
 48static inline unsigned long virt_to_phys(volatile void * address)
 49{
 50	return __pa(address);
 51}
 52
 53static inline void * phys_to_virt(unsigned long address)
 54{
 55	return __va(address);
 56}
 57
 58/*
 59 * virt_to_bus and bus_to_virt are deprecated.
 60 */
 61
 62#define virt_to_bus(x)	virt_to_phys(x)
 63#define bus_to_virt(x)	phys_to_virt(x)
 64
 65/*
 66 * Return the virtual (cached) address for the specified bus memory.
 67 * Note that we currently don't support any address outside the KIO segment.
 68 */
 69
 70static inline void *ioremap(unsigned long offset, unsigned long size)
 71{
 72#ifdef CONFIG_MMU
 73	if (offset >= XCHAL_KIO_PADDR
 74	    && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
 75		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
 76	else
 77		BUG();
 78#else
 79	return (void *)offset;
 80#endif
 81}
 82
 83static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
 84{
 85#ifdef CONFIG_MMU
 86	if (offset >= XCHAL_KIO_PADDR
 87	    && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
 88		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
 89	else
 90		BUG();
 91#else
 92	return (void *)offset;
 93#endif
 94}
 95
 96static inline void iounmap(void *addr)
 97{
 98}
 99
100/*
101 * Generic I/O
102 */
103
104#define readb(addr) \
105	({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
106#define readw(addr) \
107	({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
108#define readl(addr) \
109	({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
110#define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
111#define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
112#define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
113
114static inline __u8 __raw_readb(const volatile void __iomem *addr)
115{
116          return *(__force volatile __u8 *)(addr);
117}
118static inline __u16 __raw_readw(const volatile void __iomem *addr)
119{
120          return *(__force volatile __u16 *)(addr);
121}
122static inline __u32 __raw_readl(const volatile void __iomem *addr)
123{
124          return *(__force volatile __u32 *)(addr);
125}
126static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
127{
128          *(__force volatile __u8 *)(addr) = b;
129}
130static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
131{
132          *(__force volatile __u16 *)(addr) = b;
133}
134static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
135{
136          *(__force volatile __u32 *)(addr) = b;
137}
138
139/* These are the definitions for the x86 IO instructions
140 * inb/inw/inl/outb/outw/outl, the "string" versions
141 * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
142 * inb_p/inw_p/...
143 * The macros don't do byte-swapping.
144 */
145
146#define inb(port)		readb((u8 *)((port)))
147#define outb(val, port)		writeb((val),(u8 *)((unsigned long)(port)))
148#define inw(port)		readw((u16 *)((port)))
149#define outw(val, port)		writew((val),(u16 *)((unsigned long)(port)))
150#define inl(port)		readl((u32 *)((port)))
151#define outl(val, port)		writel((val),(u32 *)((unsigned long)(port)))
152
153#define inb_p(port)		inb((port))
154#define outb_p(val, port)	outb((val), (port))
155#define inw_p(port)		inw((port))
156#define outw_p(val, port)	outw((val), (port))
157#define inl_p(port)		inl((port))
158#define outl_p(val, port)	outl((val), (port))
159
160extern void insb (unsigned long port, void *dst, unsigned long count);
161extern void insw (unsigned long port, void *dst, unsigned long count);
162extern void insl (unsigned long port, void *dst, unsigned long count);
163extern void outsb (unsigned long port, const void *src, unsigned long count);
164extern void outsw (unsigned long port, const void *src, unsigned long count);
165extern void outsl (unsigned long port, const void *src, unsigned long count);
166
167#define IO_SPACE_LIMIT ~0
168
169#define memset_io(a,b,c)       memset((void *)(a),(b),(c))
170#define memcpy_fromio(a,b,c)   memcpy((a),(void *)(b),(c))
171#define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
172
173/* At this point the Xtensa doesn't provide byte swap instructions */
174
175#ifdef __XTENSA_EB__
176# define in_8(addr) (*(u8*)(addr))
177# define in_le16(addr) _swapw(*(u16*)(addr))
178# define in_le32(addr) _swapl(*(u32*)(addr))
179# define out_8(b, addr) *(u8*)(addr) = (b)
180# define out_le16(b, addr) *(u16*)(addr) = _swapw(b)
181# define out_le32(b, addr) *(u32*)(addr) = _swapl(b)
182#elif defined(__XTENSA_EL__)
183# define in_8(addr)  (*(u8*)(addr))
184# define in_le16(addr) (*(u16*)(addr))
185# define in_le32(addr) (*(u32*)(addr))
186# define out_8(b, addr) *(u8*)(addr) = (b)
187# define out_le16(b, addr) *(u16*)(addr) = (b)
188# define out_le32(b, addr) *(u32*)(addr) = (b)
189#else
190# error processor byte order undefined!
191#endif
192
193
194/*
195 * Convert a physical pointer to a virtual kernel pointer for /dev/mem access
196 */
197#define xlate_dev_mem_ptr(p)    __va(p)
198
199/*
200 * Convert a virtual cached pointer to an uncached pointer
201 */
202#define xlate_dev_kmem_ptr(p)   p
203
204
205#endif	/* __KERNEL__ */
206
207#endif	/* _XTENSA_IO_H */