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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#define ARCH_HAS_IOREMAP_WT
21
22#include <linux/types.h>
23#include <asm/virtconvert.h>
24#include <asm/string.h>
25#include <asm/mb-regs.h>
26#include <asm-generic/pci_iomap.h>
27#include <linux/delay.h>
28
29/*
30 * swap functions are sometimes needed to interface little-endian hardware
31 */
32
33static inline unsigned short _swapw(unsigned short v)
34{
35 return ((v << 8) | (v >> 8));
36}
37
38static inline unsigned long _swapl(unsigned long v)
39{
40 return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
41}
42
43//#define __iormb() asm volatile("membar")
44//#define __iowmb() asm volatile("membar")
45
46static inline u8 __raw_readb(const volatile void __iomem *addr)
47{
48 return __builtin_read8((volatile void __iomem *)addr);
49}
50
51static inline u16 __raw_readw(const volatile void __iomem *addr)
52{
53 return __builtin_read16((volatile void __iomem *)addr);
54}
55
56static inline u32 __raw_readl(const volatile void __iomem *addr)
57{
58 return __builtin_read32((volatile void __iomem *)addr);
59}
60
61#define __raw_writeb(datum, addr) __builtin_write8(addr, datum)
62#define __raw_writew(datum, addr) __builtin_write16(addr, datum)
63#define __raw_writel(datum, addr) __builtin_write32(addr, datum)
64
65static inline void io_outsb(unsigned int addr, const void *buf, int len)
66{
67 unsigned long __ioaddr = (unsigned long) addr;
68 const uint8_t *bp = buf;
69
70 while (len--)
71 __builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
72}
73
74static inline void io_outsw(unsigned int addr, const void *buf, int len)
75{
76 unsigned long __ioaddr = (unsigned long) addr;
77 const uint16_t *bp = buf;
78
79 while (len--)
80 __builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
81}
82
83extern void __outsl_ns(unsigned int addr, const void *buf, int len);
84extern void __outsl_sw(unsigned int addr, const void *buf, int len);
85static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
86{
87 unsigned long __ioaddr = (unsigned long) addr;
88
89 if (!swap)
90 __outsl_ns(__ioaddr, buf, len);
91 else
92 __outsl_sw(__ioaddr, buf, len);
93}
94
95static inline void io_insb(unsigned long addr, void *buf, int len)
96{
97 uint8_t *bp = buf;
98
99 while (len--)
100 *bp++ = __builtin_read8((volatile void __iomem *) addr);
101}
102
103static inline void io_insw(unsigned long addr, void *buf, int len)
104{
105 uint16_t *bp = buf;
106
107 while (len--)
108 *bp++ = __builtin_read16((volatile void __iomem *) addr);
109}
110
111extern void __insl_ns(unsigned long addr, void *buf, int len);
112extern void __insl_sw(unsigned long addr, void *buf, int len);
113static inline void __insl(unsigned long addr, void *buf, int len, int swap)
114{
115 if (!swap)
116 __insl_ns(addr, buf, len);
117 else
118 __insl_sw(addr, buf, len);
119}
120
121#define mmiowb() mb()
122
123/*
124 * make the short names macros so specific devices
125 * can override them as required
126 */
127
128static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
129{
130 memset((void __force *) addr, val, count);
131}
132
133static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
134{
135 memcpy(dst, (void __force *) src, count);
136}
137
138static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
139{
140 memcpy((void __force *) dst, src, count);
141}
142
143static inline uint8_t inb(unsigned long addr)
144{
145 return __builtin_read8((void __iomem *)addr);
146}
147
148static inline uint16_t inw(unsigned long addr)
149{
150 uint16_t ret = __builtin_read16((void __iomem *)addr);
151
152 if (__is_PCI_IO(addr))
153 ret = _swapw(ret);
154
155 return ret;
156}
157
158static inline uint32_t inl(unsigned long addr)
159{
160 uint32_t ret = __builtin_read32((void __iomem *)addr);
161
162 if (__is_PCI_IO(addr))
163 ret = _swapl(ret);
164
165 return ret;
166}
167
168static inline void outb(uint8_t datum, unsigned long addr)
169{
170 __builtin_write8((void __iomem *)addr, datum);
171}
172
173static inline void outw(uint16_t datum, unsigned long addr)
174{
175 if (__is_PCI_IO(addr))
176 datum = _swapw(datum);
177 __builtin_write16((void __iomem *)addr, datum);
178}
179
180static inline void outl(uint32_t datum, unsigned long addr)
181{
182 if (__is_PCI_IO(addr))
183 datum = _swapl(datum);
184 __builtin_write32((void __iomem *)addr, datum);
185}
186
187#define inb_p(addr) inb(addr)
188#define inw_p(addr) inw(addr)
189#define inl_p(addr) inl(addr)
190#define outb_p(x,addr) outb(x,addr)
191#define outw_p(x,addr) outw(x,addr)
192#define outl_p(x,addr) outl(x,addr)
193
194#define outsb(a,b,l) io_outsb(a,b,l)
195#define outsw(a,b,l) io_outsw(a,b,l)
196#define outsl(a,b,l) __outsl(a,b,l,0)
197
198#define insb(a,b,l) io_insb(a,b,l)
199#define insw(a,b,l) io_insw(a,b,l)
200#define insl(a,b,l) __insl(a,b,l,0)
201
202#define IO_SPACE_LIMIT 0xffffffff
203
204static inline uint8_t readb(const volatile void __iomem *addr)
205{
206 return __builtin_read8((__force void volatile __iomem *) addr);
207}
208
209static inline uint16_t readw(const volatile void __iomem *addr)
210{
211 uint16_t ret = __builtin_read16((__force void volatile __iomem *)addr);
212
213 if (__is_PCI_MEM(addr))
214 ret = _swapw(ret);
215 return ret;
216}
217
218static inline uint32_t readl(const volatile void __iomem *addr)
219{
220 uint32_t ret = __builtin_read32((__force void volatile __iomem *)addr);
221
222 if (__is_PCI_MEM(addr))
223 ret = _swapl(ret);
224
225 return ret;
226}
227
228#define readb_relaxed readb
229#define readw_relaxed readw
230#define readl_relaxed readl
231
232static inline void writeb(uint8_t datum, volatile void __iomem *addr)
233{
234 __builtin_write8(addr, datum);
235 if (__is_PCI_MEM(addr))
236 __flush_PCI_writes();
237}
238
239static inline void writew(uint16_t datum, volatile void __iomem *addr)
240{
241 if (__is_PCI_MEM(addr))
242 datum = _swapw(datum);
243
244 __builtin_write16(addr, datum);
245 if (__is_PCI_MEM(addr))
246 __flush_PCI_writes();
247}
248
249static inline void writel(uint32_t datum, volatile void __iomem *addr)
250{
251 if (__is_PCI_MEM(addr))
252 datum = _swapl(datum);
253
254 __builtin_write32(addr, datum);
255 if (__is_PCI_MEM(addr))
256 __flush_PCI_writes();
257}
258
259#define writeb_relaxed writeb
260#define writew_relaxed writew
261#define writel_relaxed writel
262
263/* Values for nocacheflag and cmode */
264#define IOMAP_FULL_CACHING 0
265#define IOMAP_NOCACHE_SER 1
266#define IOMAP_NOCACHE_NONSER 2
267#define IOMAP_WRITETHROUGH 3
268
269extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
270
271static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
272{
273 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
274}
275
276static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
277{
278 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
279}
280
281static inline void __iomem *ioremap_wt(unsigned long physaddr, unsigned long size)
282{
283 return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
284}
285
286static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
287{
288 return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
289}
290
291#define ioremap_wc ioremap_nocache
292#define ioremap_uc ioremap_nocache
293
294extern void iounmap(void volatile __iomem *addr);
295
296static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
297{
298 return (void __iomem *) port;
299}
300
301static inline void ioport_unmap(void __iomem *p)
302{
303}
304
305static inline void flush_write_buffers(void)
306{
307 __asm__ __volatile__ ("membar" : : :"memory");
308}
309
310/*
311 * do appropriate I/O accesses for token type
312 */
313static inline unsigned int ioread8(void __iomem *p)
314{
315 return __builtin_read8(p);
316}
317
318static inline unsigned int ioread16(void __iomem *p)
319{
320 uint16_t ret = __builtin_read16(p);
321 if (__is_PCI_addr(p))
322 ret = _swapw(ret);
323 return ret;
324}
325
326static inline unsigned int ioread32(void __iomem *p)
327{
328 uint32_t ret = __builtin_read32(p);
329 if (__is_PCI_addr(p))
330 ret = _swapl(ret);
331 return ret;
332}
333
334static inline void iowrite8(u8 val, void __iomem *p)
335{
336 __builtin_write8(p, val);
337 if (__is_PCI_MEM(p))
338 __flush_PCI_writes();
339}
340
341static inline void iowrite16(u16 val, void __iomem *p)
342{
343 if (__is_PCI_addr(p))
344 val = _swapw(val);
345 __builtin_write16(p, val);
346 if (__is_PCI_MEM(p))
347 __flush_PCI_writes();
348}
349
350static inline void iowrite32(u32 val, void __iomem *p)
351{
352 if (__is_PCI_addr(p))
353 val = _swapl(val);
354 __builtin_write32(p, val);
355 if (__is_PCI_MEM(p))
356 __flush_PCI_writes();
357}
358
359#define ioread16be(addr) be16_to_cpu(ioread16(addr))
360#define ioread32be(addr) be32_to_cpu(ioread32(addr))
361#define iowrite16be(v, addr) iowrite16(cpu_to_be16(v), (addr))
362#define iowrite32be(v, addr) iowrite32(cpu_to_be32(v), (addr))
363
364static inline void ioread8_rep(void __iomem *p, void *dst, unsigned long count)
365{
366 io_insb((unsigned long) p, dst, count);
367}
368
369static inline void ioread16_rep(void __iomem *p, void *dst, unsigned long count)
370{
371 io_insw((unsigned long) p, dst, count);
372}
373
374static inline void ioread32_rep(void __iomem *p, void *dst, unsigned long count)
375{
376 __insl_ns((unsigned long) p, dst, count);
377}
378
379static inline void iowrite8_rep(void __iomem *p, const void *src, unsigned long count)
380{
381 io_outsb((unsigned long) p, src, count);
382}
383
384static inline void iowrite16_rep(void __iomem *p, const void *src, unsigned long count)
385{
386 io_outsw((unsigned long) p, src, count);
387}
388
389static inline void iowrite32_rep(void __iomem *p, const void *src, unsigned long count)
390{
391 __outsl_ns((unsigned long) p, src, count);
392}
393
394/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
395struct pci_dev;
396static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
397{
398}
399
400
401/*
402 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
403 * access
404 */
405#define xlate_dev_mem_ptr(p) __va(p)
406
407/*
408 * Convert a virtual cached pointer to an uncached pointer
409 */
410#define xlate_dev_kmem_ptr(p) p
411
412#endif /* __KERNEL__ */
413
414#endif /* _ASM_IO_H */