Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
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__
15#include <linux/config.h>
16#include <asm/byteorder.h>
17
18#include <linux/types.h>
19#include <asm/fixmap.h>
20
21#define _IO_BASE 0
22
23
24/*
25 * swap functions to change byte order from little-endian to big-endian and
26 * vice versa.
27 */
28
29static inline unsigned short _swapw (unsigned short v)
30{
31 return (v << 8) | (v >> 8);
32}
33
34static inline unsigned int _swapl (unsigned int v)
35{
36 return (v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24);
37}
38
39/*
40 * Change virtual addresses to physical addresses and vv.
41 * These are trivial on the 1:1 Linux/Xtensa mapping
42 */
43
44static inline unsigned long virt_to_phys(volatile void * address)
45{
46 return PHYSADDR((unsigned long)address);
47}
48
49static inline void * phys_to_virt(unsigned long address)
50{
51 return (void*) CACHED_ADDR(address);
52}
53
54/*
55 * IO bus memory addresses are also 1:1 with the physical address
56 */
57
58static inline unsigned long virt_to_bus(volatile void * address)
59{
60 return PHYSADDR((unsigned long)address);
61}
62
63static inline void * bus_to_virt (unsigned long address)
64{
65 return (void *) CACHED_ADDR(address);
66}
67
68/*
69 * Change "struct page" to physical address.
70 */
71
72static inline void *ioremap(unsigned long offset, unsigned long size)
73{
74 return (void *) CACHED_ADDR_IO(offset);
75}
76
77static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
78{
79 return (void *) BYPASS_ADDR_IO(offset);
80}
81
82static inline void iounmap(void *addr)
83{
84}
85
86/*
87 * Generic I/O
88 */
89
90#define readb(addr) \
91 ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
92#define readw(addr) \
93 ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
94#define readl(addr) \
95 ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
96#define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
97#define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
98#define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
99
100static inline __u8 __raw_readb(const volatile void __iomem *addr)
101{
102 return *(__force volatile __u8 *)(addr);
103}
104static inline __u16 __raw_readw(const volatile void __iomem *addr)
105{
106 return *(__force volatile __u16 *)(addr);
107}
108static inline __u32 __raw_readl(const volatile void __iomem *addr)
109{
110 return *(__force volatile __u32 *)(addr);
111}
112static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
113{
114 *(__force volatile __u8 *)(addr) = b;
115}
116static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
117{
118 *(__force volatile __u16 *)(addr) = b;
119}
120static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
121{
122 *(__force volatile __u32 *)(addr) = b;
123}
124
125
126
127
128/* These are the definitions for the x86 IO instructions
129 * inb/inw/inl/outb/outw/outl, the "string" versions
130 * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
131 * inb_p/inw_p/...
132 * The macros don't do byte-swapping.
133 */
134
135#define inb(port) readb((u8 *)((port)+_IO_BASE))
136#define outb(val, port) writeb((val),(u8 *)((unsigned long)(port)+_IO_BASE))
137#define inw(port) readw((u16 *)((port)+_IO_BASE))
138#define outw(val, port) writew((val),(u16 *)((unsigned long)(port)+_IO_BASE))
139#define inl(port) readl((u32 *)((port)+_IO_BASE))
140#define outl(val, port) writel((val),(u32 *)((unsigned long)(port)))
141
142#define inb_p(port) inb((port))
143#define outb_p(val, port) outb((val), (port))
144#define inw_p(port) inw((port))
145#define outw_p(val, port) outw((val), (port))
146#define inl_p(port) inl((port))
147#define outl_p(val, port) outl((val), (port))
148
149extern void insb (unsigned long port, void *dst, unsigned long count);
150extern void insw (unsigned long port, void *dst, unsigned long count);
151extern void insl (unsigned long port, void *dst, unsigned long count);
152extern void outsb (unsigned long port, const void *src, unsigned long count);
153extern void outsw (unsigned long port, const void *src, unsigned long count);
154extern void outsl (unsigned long port, const void *src, unsigned long count);
155
156#define IO_SPACE_LIMIT ~0
157
158#define memset_io(a,b,c) memset((void *)(a),(b),(c))
159#define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
160#define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
161
162/* At this point the Xtensa doesn't provide byte swap instructions */
163
164#ifdef __XTENSA_EB__
165# define in_8(addr) (*(u8*)(addr))
166# define in_le16(addr) _swapw(*(u16*)(addr))
167# define in_le32(addr) _swapl(*(u32*)(addr))
168# define out_8(b, addr) *(u8*)(addr) = (b)
169# define out_le16(b, addr) *(u16*)(addr) = _swapw(b)
170# define out_le32(b, addr) *(u32*)(addr) = _swapl(b)
171#elif defined(__XTENSA_EL__)
172# define in_8(addr) (*(u8*)(addr))
173# define in_le16(addr) (*(u16*)(addr))
174# define in_le32(addr) (*(u32*)(addr))
175# define out_8(b, addr) *(u8*)(addr) = (b)
176# define out_le16(b, addr) *(u16*)(addr) = (b)
177# define out_le32(b, addr) *(u32*)(addr) = (b)
178#else
179# error processor byte order undefined!
180#endif
181
182
183/*
184 * * Convert a physical pointer to a virtual kernel pointer for /dev/mem
185 * * access
186 * */
187#define xlate_dev_mem_ptr(p) __va(p)
188
189/*
190 * * Convert a virtual cached pointer to an uncached pointer
191 * */
192#define xlate_dev_kmem_ptr(p) p
193
194
195#endif /* __KERNEL__ */
196
197#endif /* _XTENSA_IO_H */