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