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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 0xf0000000
22#define XCHAL_KIO_BYPASS_VADDR 0xf8000000
23#define XCHAL_KIO_PADDR 0xf0000000
24#define XCHAL_KIO_SIZE 0x08000000
25
26/*
27 * swap functions to change byte order from little-endian to big-endian and
28 * vice versa.
29 */
30
31static inline unsigned short _swapw (unsigned short v)
32{
33 return (v << 8) | (v >> 8);
34}
35
36static inline unsigned int _swapl (unsigned int v)
37{
38 return (v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24);
39}
40
41/*
42 * Change virtual addresses to physical addresses and vv.
43 * These are trivial on the 1:1 Linux/Xtensa mapping
44 */
45
46static inline unsigned long virt_to_phys(volatile void * address)
47{
48 return __pa(address);
49}
50
51static inline void * phys_to_virt(unsigned long address)
52{
53 return __va(address);
54}
55
56/*
57 * virt_to_bus and bus_to_virt are deprecated.
58 */
59
60#define virt_to_bus(x) virt_to_phys(x)
61#define bus_to_virt(x) phys_to_virt(x)
62
63/*
64 * Return the virtual (cached) address for the specified bus memory.
65 * Note that we currently don't support any address outside the KIO segment.
66 */
67
68static inline void *ioremap(unsigned long offset, unsigned long size)
69{
70 if (offset >= XCHAL_KIO_PADDR
71 && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
72 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
73
74 else
75 BUG();
76}
77
78static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
79{
80 if (offset >= XCHAL_KIO_PADDR
81 && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
82 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
83 else
84 BUG();
85}
86
87static inline void iounmap(void *addr)
88{
89}
90
91/*
92 * Generic I/O
93 */
94
95#define readb(addr) \
96 ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
97#define readw(addr) \
98 ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
99#define readl(addr) \
100 ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
101#define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
102#define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
103#define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
104
105static inline __u8 __raw_readb(const volatile void __iomem *addr)
106{
107 return *(__force volatile __u8 *)(addr);
108}
109static inline __u16 __raw_readw(const volatile void __iomem *addr)
110{
111 return *(__force volatile __u16 *)(addr);
112}
113static inline __u32 __raw_readl(const volatile void __iomem *addr)
114{
115 return *(__force volatile __u32 *)(addr);
116}
117static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
118{
119 *(__force volatile __u8 *)(addr) = b;
120}
121static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
122{
123 *(__force volatile __u16 *)(addr) = b;
124}
125static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
126{
127 *(__force volatile __u32 *)(addr) = b;
128}
129
130/* These are the definitions for the x86 IO instructions
131 * inb/inw/inl/outb/outw/outl, the "string" versions
132 * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
133 * inb_p/inw_p/...
134 * The macros don't do byte-swapping.
135 */
136
137#define inb(port) readb((u8 *)((port)))
138#define outb(val, port) writeb((val),(u8 *)((unsigned long)(port)))
139#define inw(port) readw((u16 *)((port)))
140#define outw(val, port) writew((val),(u16 *)((unsigned long)(port)))
141#define inl(port) readl((u32 *)((port)))
142#define outl(val, port) writel((val),(u32 *)((unsigned long)(port)))
143
144#define inb_p(port) inb((port))
145#define outb_p(val, port) outb((val), (port))
146#define inw_p(port) inw((port))
147#define outw_p(val, port) outw((val), (port))
148#define inl_p(port) inl((port))
149#define outl_p(val, port) outl((val), (port))
150
151extern void insb (unsigned long port, void *dst, unsigned long count);
152extern void insw (unsigned long port, void *dst, unsigned long count);
153extern void insl (unsigned long port, void *dst, unsigned long count);
154extern void outsb (unsigned long port, const void *src, unsigned long count);
155extern void outsw (unsigned long port, const void *src, unsigned long count);
156extern void outsl (unsigned long port, const void *src, unsigned long count);
157
158#define IO_SPACE_LIMIT ~0
159
160#define memset_io(a,b,c) memset((void *)(a),(b),(c))
161#define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
162#define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
163
164/* At this point the Xtensa doesn't provide byte swap instructions */
165
166#ifdef __XTENSA_EB__
167# define in_8(addr) (*(u8*)(addr))
168# define in_le16(addr) _swapw(*(u16*)(addr))
169# define in_le32(addr) _swapl(*(u32*)(addr))
170# define out_8(b, addr) *(u8*)(addr) = (b)
171# define out_le16(b, addr) *(u16*)(addr) = _swapw(b)
172# define out_le32(b, addr) *(u32*)(addr) = _swapl(b)
173#elif defined(__XTENSA_EL__)
174# define in_8(addr) (*(u8*)(addr))
175# define in_le16(addr) (*(u16*)(addr))
176# define in_le32(addr) (*(u32*)(addr))
177# define out_8(b, addr) *(u8*)(addr) = (b)
178# define out_le16(b, addr) *(u16*)(addr) = (b)
179# define out_le32(b, addr) *(u32*)(addr) = (b)
180#else
181# error processor byte order undefined!
182#endif
183
184
185/*
186 * Convert a physical pointer to a virtual kernel pointer for /dev/mem access
187 */
188#define xlate_dev_mem_ptr(p) __va(p)
189
190/*
191 * Convert a virtual cached pointer to an uncached pointer
192 */
193#define xlate_dev_kmem_ptr(p) p
194
195
196#endif /* __KERNEL__ */
197
198#endif /* _XTENSA_IO_H */