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