blob: 556e5eed34f54af663fd01b7200b1c5310beece3 [file] [log] [blame]
Chris Zankel9a8fd552005-06-23 22:01:26 -07001/*
2 * linux/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__
Chris Zankel9a8fd552005-06-23 22:01:26 -070015#include <asm/byteorder.h>
16
17#include <linux/types.h>
18#include <asm/fixmap.h>
19
20#define _IO_BASE 0
21
22
23/*
24 * swap functions to change byte order from little-endian to big-endian and
25 * vice versa.
26 */
27
28static inline unsigned short _swapw (unsigned short v)
29{
30 return (v << 8) | (v >> 8);
31}
32
33static inline unsigned int _swapl (unsigned int v)
34{
35 return (v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24);
36}
37
38/*
39 * Change virtual addresses to physical addresses and vv.
40 * These are trivial on the 1:1 Linux/Xtensa mapping
41 */
42
Adrian Bunkd99cf712005-09-03 15:57:53 -070043static inline unsigned long virt_to_phys(volatile void * address)
Chris Zankel9a8fd552005-06-23 22:01:26 -070044{
45 return PHYSADDR((unsigned long)address);
46}
47
Adrian Bunkd99cf712005-09-03 15:57:53 -070048static inline void * phys_to_virt(unsigned long address)
Chris Zankel9a8fd552005-06-23 22:01:26 -070049{
50 return (void*) CACHED_ADDR(address);
51}
52
53/*
54 * IO bus memory addresses are also 1:1 with the physical address
55 */
56
Adrian Bunkd99cf712005-09-03 15:57:53 -070057static inline unsigned long virt_to_bus(volatile void * address)
Chris Zankel9a8fd552005-06-23 22:01:26 -070058{
59 return PHYSADDR((unsigned long)address);
60}
61
Adrian Bunkd99cf712005-09-03 15:57:53 -070062static inline void * bus_to_virt (unsigned long address)
Chris Zankel9a8fd552005-06-23 22:01:26 -070063{
64 return (void *) CACHED_ADDR(address);
65}
66
67/*
68 * Change "struct page" to physical address.
69 */
70
Adrian Bunkd99cf712005-09-03 15:57:53 -070071static inline void *ioremap(unsigned long offset, unsigned long size)
Chris Zankel9a8fd552005-06-23 22:01:26 -070072{
73 return (void *) CACHED_ADDR_IO(offset);
74}
75
Adrian Bunkd99cf712005-09-03 15:57:53 -070076static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
Chris Zankel9a8fd552005-06-23 22:01:26 -070077{
78 return (void *) BYPASS_ADDR_IO(offset);
79}
80
Adrian Bunkd99cf712005-09-03 15:57:53 -070081static inline void iounmap(void *addr)
Chris Zankel9a8fd552005-06-23 22:01:26 -070082{
83}
84
85/*
86 * Generic I/O
87 */
88
89#define readb(addr) \
90 ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
91#define readw(addr) \
92 ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
93#define readl(addr) \
94 ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
95#define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
96#define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
97#define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
98
99static inline __u8 __raw_readb(const volatile void __iomem *addr)
100{
101 return *(__force volatile __u8 *)(addr);
102}
103static inline __u16 __raw_readw(const volatile void __iomem *addr)
104{
105 return *(__force volatile __u16 *)(addr);
106}
107static inline __u32 __raw_readl(const volatile void __iomem *addr)
108{
109 return *(__force volatile __u32 *)(addr);
110}
111static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
112{
113 *(__force volatile __u8 *)(addr) = b;
114}
115static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
116{
117 *(__force volatile __u16 *)(addr) = b;
118}
119static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
120{
121 *(__force volatile __u32 *)(addr) = b;
122}
123
124
125
126
127/* These are the definitions for the x86 IO instructions
128 * inb/inw/inl/outb/outw/outl, the "string" versions
129 * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
130 * inb_p/inw_p/...
131 * The macros don't do byte-swapping.
132 */
133
134#define inb(port) readb((u8 *)((port)+_IO_BASE))
135#define outb(val, port) writeb((val),(u8 *)((unsigned long)(port)+_IO_BASE))
136#define inw(port) readw((u16 *)((port)+_IO_BASE))
137#define outw(val, port) writew((val),(u16 *)((unsigned long)(port)+_IO_BASE))
138#define inl(port) readl((u32 *)((port)+_IO_BASE))
139#define outl(val, port) writel((val),(u32 *)((unsigned long)(port)))
140
141#define inb_p(port) inb((port))
142#define outb_p(val, port) outb((val), (port))
143#define inw_p(port) inw((port))
144#define outw_p(val, port) outw((val), (port))
145#define inl_p(port) inl((port))
146#define outl_p(val, port) outl((val), (port))
147
148extern void insb (unsigned long port, void *dst, unsigned long count);
149extern void insw (unsigned long port, void *dst, unsigned long count);
150extern void insl (unsigned long port, void *dst, unsigned long count);
151extern void outsb (unsigned long port, const void *src, unsigned long count);
152extern void outsw (unsigned long port, const void *src, unsigned long count);
153extern void outsl (unsigned long port, const void *src, unsigned long count);
154
155#define IO_SPACE_LIMIT ~0
156
157#define memset_io(a,b,c) memset((void *)(a),(b),(c))
158#define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
159#define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
160
161/* At this point the Xtensa doesn't provide byte swap instructions */
162
163#ifdef __XTENSA_EB__
164# define in_8(addr) (*(u8*)(addr))
165# define in_le16(addr) _swapw(*(u16*)(addr))
166# define in_le32(addr) _swapl(*(u32*)(addr))
167# define out_8(b, addr) *(u8*)(addr) = (b)
168# define out_le16(b, addr) *(u16*)(addr) = _swapw(b)
169# define out_le32(b, addr) *(u32*)(addr) = _swapl(b)
170#elif defined(__XTENSA_EL__)
171# define in_8(addr) (*(u8*)(addr))
172# define in_le16(addr) (*(u16*)(addr))
173# define in_le32(addr) (*(u32*)(addr))
174# define out_8(b, addr) *(u8*)(addr) = (b)
175# define out_le16(b, addr) *(u16*)(addr) = (b)
176# define out_le32(b, addr) *(u32*)(addr) = (b)
177#else
178# error processor byte order undefined!
179#endif
180
181
182/*
183 * * Convert a physical pointer to a virtual kernel pointer for /dev/mem
184 * * access
185 * */
186#define xlate_dev_mem_ptr(p) __va(p)
187
188/*
189 * * Convert a virtual cached pointer to an uncached pointer
190 * */
191#define xlate_dev_kmem_ptr(p) p
192
193
194#endif /* __KERNEL__ */
195
196#endif /* _XTENSA_IO_H */