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Linux kernel mirror (for testing)
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linux
1/* io.h: FRV I/O operations
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * This gets interesting when talking to the PCI bus - the CPU is in big endian
12 * mode, the PCI bus is little endian and the hardware in the middle can do
13 * byte swapping
14 */
15#ifndef _ASM_IO_H
16#define _ASM_IO_H
17
18#ifdef __KERNEL__
19
20#include <linux/config.h>
21#include <asm/virtconvert.h>
22#include <asm/string.h>
23#include <asm/mb-regs.h>
24#include <linux/delay.h>
25
26/*
27 * swap functions are sometimes needed to interface little-endian hardware
28 */
29
30static inline unsigned short _swapw(unsigned short v)
31{
32 return ((v << 8) | (v >> 8));
33}
34
35static inline unsigned long _swapl(unsigned long v)
36{
37 return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
38}
39
40//#define __iormb() asm volatile("membar")
41//#define __iowmb() asm volatile("membar")
42
43#define __raw_readb(addr) __builtin_read8((void *) (addr))
44#define __raw_readw(addr) __builtin_read16((void *) (addr))
45#define __raw_readl(addr) __builtin_read32((void *) (addr))
46
47#define __raw_writeb(datum, addr) __builtin_write8((void *) (addr), datum)
48#define __raw_writew(datum, addr) __builtin_write16((void *) (addr), datum)
49#define __raw_writel(datum, addr) __builtin_write32((void *) (addr), datum)
50
51static inline void io_outsb(unsigned int addr, const void *buf, int len)
52{
53 unsigned long __ioaddr = (unsigned long) addr;
54 const uint8_t *bp = buf;
55
56 while (len--)
57 __builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
58}
59
60static inline void io_outsw(unsigned int addr, const void *buf, int len)
61{
62 unsigned long __ioaddr = (unsigned long) addr;
63 const uint16_t *bp = buf;
64
65 while (len--)
66 __builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
67}
68
69extern void __outsl_ns(unsigned int addr, const void *buf, int len);
70extern void __outsl_sw(unsigned int addr, const void *buf, int len);
71static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
72{
73 unsigned long __ioaddr = (unsigned long) addr;
74
75 if (!swap)
76 __outsl_ns(__ioaddr, buf, len);
77 else
78 __outsl_sw(__ioaddr, buf, len);
79}
80
81static inline void io_insb(unsigned long addr, void *buf, int len)
82{
83 uint8_t *bp = buf;
84
85 while (len--)
86 *bp++ = __builtin_read8((volatile void __iomem *) addr);
87}
88
89static inline void io_insw(unsigned long addr, void *buf, int len)
90{
91 uint16_t *bp = buf;
92
93 while (len--)
94 *bp++ = __builtin_read16((volatile void __iomem *) addr);
95}
96
97extern void __insl_ns(unsigned long addr, void *buf, int len);
98extern void __insl_sw(unsigned long addr, void *buf, int len);
99static inline void __insl(unsigned long addr, void *buf, int len, int swap)
100{
101 if (!swap)
102 __insl_ns(addr, buf, len);
103 else
104 __insl_sw(addr, buf, len);
105}
106
107/*
108 * make the short names macros so specific devices
109 * can override them as required
110 */
111
112static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
113{
114 memset((void __force *) addr, val, count);
115}
116
117static inline void memcpy_fromio(void *dst, volatile void __iomem *src, int count)
118{
119 memcpy(dst, (void __force *) src, count);
120}
121
122static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
123{
124 memcpy((void __force *) dst, src, count);
125}
126
127static inline uint8_t inb(unsigned long addr)
128{
129 return __builtin_read8((void *)addr);
130}
131
132static inline uint16_t inw(unsigned long addr)
133{
134 uint16_t ret = __builtin_read16((void *)addr);
135
136 if (__is_PCI_IO(addr))
137 ret = _swapw(ret);
138
139 return ret;
140}
141
142static inline uint32_t inl(unsigned long addr)
143{
144 uint32_t ret = __builtin_read32((void *)addr);
145
146 if (__is_PCI_IO(addr))
147 ret = _swapl(ret);
148
149 return ret;
150}
151
152static inline void outb(uint8_t datum, unsigned long addr)
153{
154 __builtin_write8((void *)addr, datum);
155}
156
157static inline void outw(uint16_t datum, unsigned long addr)
158{
159 if (__is_PCI_IO(addr))
160 datum = _swapw(datum);
161 __builtin_write16((void *)addr, datum);
162}
163
164static inline void outl(uint32_t datum, unsigned long addr)
165{
166 if (__is_PCI_IO(addr))
167 datum = _swapl(datum);
168 __builtin_write32((void *)addr, datum);
169}
170
171#define inb_p(addr) inb(addr)
172#define inw_p(addr) inw(addr)
173#define inl_p(addr) inl(addr)
174#define outb_p(x,addr) outb(x,addr)
175#define outw_p(x,addr) outw(x,addr)
176#define outl_p(x,addr) outl(x,addr)
177
178#define outsb(a,b,l) io_outsb(a,b,l)
179#define outsw(a,b,l) io_outsw(a,b,l)
180#define outsl(a,b,l) __outsl(a,b,l,0)
181
182#define insb(a,b,l) io_insb(a,b,l)
183#define insw(a,b,l) io_insw(a,b,l)
184#define insl(a,b,l) __insl(a,b,l,0)
185
186#define IO_SPACE_LIMIT 0xffffffff
187
188static inline uint8_t readb(const volatile void __iomem *addr)
189{
190 return __builtin_read8((volatile uint8_t __force *) addr);
191}
192
193static inline uint16_t readw(const volatile void __iomem *addr)
194{
195 uint16_t ret = __builtin_read16((volatile uint16_t __force *)addr);
196
197 if (__is_PCI_MEM(addr))
198 ret = _swapw(ret);
199 return ret;
200}
201
202static inline uint32_t readl(const volatile void __iomem *addr)
203{
204 uint32_t ret = __builtin_read32((volatile uint32_t __force *)addr);
205
206 if (__is_PCI_MEM(addr))
207 ret = _swapl(ret);
208
209 return ret;
210}
211
212static inline void writeb(uint8_t datum, volatile void __iomem *addr)
213{
214 __builtin_write8((volatile uint8_t __force *) addr, datum);
215 if (__is_PCI_MEM(addr))
216 __flush_PCI_writes();
217}
218
219static inline void writew(uint16_t datum, volatile void __iomem *addr)
220{
221 if (__is_PCI_MEM(addr))
222 datum = _swapw(datum);
223
224 __builtin_write16((volatile uint16_t __force *) addr, datum);
225 if (__is_PCI_MEM(addr))
226 __flush_PCI_writes();
227}
228
229static inline void writel(uint32_t datum, volatile void __iomem *addr)
230{
231 if (__is_PCI_MEM(addr))
232 datum = _swapl(datum);
233
234 __builtin_write32((volatile uint32_t __force *) addr, datum);
235 if (__is_PCI_MEM(addr))
236 __flush_PCI_writes();
237}
238
239
240/* Values for nocacheflag and cmode */
241#define IOMAP_FULL_CACHING 0
242#define IOMAP_NOCACHE_SER 1
243#define IOMAP_NOCACHE_NONSER 2
244#define IOMAP_WRITETHROUGH 3
245
246extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
247extern void __iounmap(void __iomem *addr, unsigned long size);
248
249static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
250{
251 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
252}
253
254static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
255{
256 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
257}
258
259static inline void __iomem *ioremap_writethrough(unsigned long physaddr, unsigned long size)
260{
261 return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
262}
263
264static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
265{
266 return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
267}
268
269extern void iounmap(void __iomem *addr);
270
271static inline void flush_write_buffers(void)
272{
273 __asm__ __volatile__ ("membar" : : :"memory");
274}
275
276
277/*
278 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
279 * access
280 */
281#define xlate_dev_mem_ptr(p) __va(p)
282
283/*
284 * Convert a virtual cached pointer to an uncached pointer
285 */
286#define xlate_dev_kmem_ptr(p) p
287
288#endif /* __KERNEL__ */
289
290#endif /* _ASM_IO_H */