aboutsummaryrefslogtreecommitdiff
path: root/include/asm-generic/io.h
blob: d1e93284d72a6ebdc4e246732a11e398e6ba5d7f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
/* Generic I/O port emulation, based on MN10300 code
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#ifndef __ASM_GENERIC_IO_H
#define __ASM_GENERIC_IO_H

#include <asm/page.h> /* I/O is all done through memory accesses */
#include <asm/cacheflush.h>
#include <linux/types.h>

#ifdef CONFIG_GENERIC_IOMAP
#include <asm-generic/iomap.h>
#endif

#include <asm-generic/pci_iomap.h>

#ifndef mmiowb
#define mmiowb() do {} while (0)
#endif

/*****************************************************************************/
/*
 * readX/writeX() are used to access memory mapped devices. On some
 * architectures the memory mapped IO stuff needs to be accessed
 * differently. On the simple architectures, we just read/write the
 * memory location directly.
 */
#ifndef __raw_readb
static inline u8 __raw_readb(const volatile void __iomem *addr)
{
	return *(const volatile u8 __force *) addr;
}
#endif

#ifndef __raw_readw
static inline u16 __raw_readw(const volatile void __iomem *addr)
{
	return *(const volatile u16 __force *) addr;
}
#endif

#ifndef __raw_readl
static inline u32 __raw_readl(const volatile void __iomem *addr)
{
	return *(const volatile u32 __force *) addr;
}
#endif

#define readb __raw_readb
#define readw(addr) __le16_to_cpu(__raw_readw(addr))
#define readl(addr) __le32_to_cpu(__raw_readl(addr))

#ifndef __raw_writeb
static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
{
	*(volatile u8 __force *) addr = b;
}
#endif

#ifndef __raw_writew
static inline void __raw_writew(u16 b, volatile void __iomem *addr)
{
	*(volatile u16 __force *) addr = b;
}
#endif

#ifndef __raw_writel
static inline void __raw_writel(u32 b, volatile void __iomem *addr)
{
	*(volatile u32 __force *) addr = b;
}
#endif

#define writeb __raw_writeb
#define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
#define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)

#ifdef CONFIG_64BIT
#ifndef __raw_readq
static inline u64 __raw_readq(const volatile void __iomem *addr)
{
	return *(const volatile u64 __force *) addr;
}
#endif

#define readq(addr) __le64_to_cpu(__raw_readq(addr))

#ifndef __raw_writeq
static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
{
	*(volatile u64 __force *) addr = b;
}
#endif

#define writeq(b, addr) __raw_writeq(__cpu_to_le64(b), addr)
#endif /* CONFIG_64BIT */

#ifndef PCI_IOBASE
#define PCI_IOBASE ((void __iomem *) 0)
#endif

/*****************************************************************************/
/*
 * traditional input/output functions
 */

static inline u8 inb(unsigned long addr)
{
	return readb(addr + PCI_IOBASE);
}

static inline u16 inw(unsigned long addr)
{
	return readw(addr + PCI_IOBASE);
}

static inline u32 inl(unsigned long addr)
{
	return readl(addr + PCI_IOBASE);
}

static inline void outb(u8 b, unsigned long addr)
{
	writeb(b, addr + PCI_IOBASE);
}

static inline void outw(u16 b, unsigned long addr)
{
	writew(b, addr + PCI_IOBASE);
}

static inline void outl(u32 b, unsigned long addr)
{
	writel(b, addr + PCI_IOBASE);
}

#define inb_p(addr)	inb(addr)
#define inw_p(addr)	inw(addr)
#define inl_p(addr)	inl(addr)
#define outb_p(x, addr)	outb((x), (addr))
#define outw_p(x, addr)	outw((x), (addr))
#define outl_p(x, addr)	outl((x), (addr))

#ifndef insb
static inline void insb(unsigned long addr, void *buffer, int count)
{
	if (count) {
		u8 *buf = buffer;
		do {
			u8 x = __raw_readb(addr + PCI_IOBASE);
			*buf++ = x;
		} while (--count);
	}
}
#endif

#ifndef insw
static inline void insw(unsigned long addr, void *buffer, int count)
{
	if (count) {
		u16 *buf = buffer;
		do {
			u16 x = __raw_readw(addr + PCI_IOBASE);
			*buf++ = x;
		} while (--count);
	}
}
#endif

#ifndef insl
static inline void insl(unsigned long addr, void *buffer, int count)
{
	if (count) {
		u32 *buf = buffer;
		do {
			u32 x = __raw_readl(addr + PCI_IOBASE);
			*buf++ = x;
		} while (--count);
	}
}
#endif

#ifndef outsb
static inline void outsb(unsigned long addr, const void *buffer, int count)
{
	if (count) {
		const u8 *buf = buffer;
		do {
			__raw_writeb(*buf++, addr + PCI_IOBASE);
		} while (--count);
	}
}
#endif

#ifndef outsw
static inline void outsw(unsigned long addr, const void *buffer, int count)
{
	if (count) {
		const u16 *buf = buffer;
		do {
			__raw_writew(*buf++, addr + PCI_IOBASE);
		} while (--count);
	}
}
#endif

#ifndef outsl
static inline void outsl(unsigned long addr, const void *buffer, int count)
{
	if (count) {
		const u32 *buf = buffer;
		do {
			__raw_writel(*buf++, addr + PCI_IOBASE);
		} while (--count);
	}
}
#endif

static inline void readsl(const void __iomem *addr, void *buf, int len)
{
	insl(addr - PCI_IOBASE, buf, len);
}

static inline void readsw(const void __iomem *addr, void *buf, int len)
{
	insw(addr - PCI_IOBASE, buf, len);
}

static inline void readsb(const void __iomem *addr, void *buf, int len)
{
	insb(addr - PCI_IOBASE, buf, len);
}

static inline void writesl(const void __iomem *addr, const void *buf, int len)
{
	outsl(addr - PCI_IOBASE, buf, len);
}

static inline void writesw(const void __iomem *addr, const void *buf, int len)
{
	outsw(addr - PCI_IOBASE, buf, len);
}

static inline void writesb(const void __iomem *addr, const void *buf, int len)
{
	outsb(addr - PCI_IOBASE, buf, len);
}

#ifndef CONFIG_GENERIC_IOMAP
#define ioread8(addr)		readb(addr)
#define ioread16(addr)		readw(addr)
#define ioread16be(addr)	be16_to_cpu(ioread16(addr))
#define ioread32(addr)		readl(addr)
#define ioread32be(addr)	be32_to_cpu(ioread32(addr))

#define iowrite8(v, addr)	writeb((v), (addr))
#define iowrite16(v, addr)	writew((v), (addr))
#define iowrite16be(v, addr)	iowrite16(be16_to_cpu(v), (addr))
#define iowrite32(v, addr)	writel((v), (addr))
#define iowrite32be(v, addr)	iowrite32(be32_to_cpu(v), (addr))

#define ioread8_rep(p, dst, count) \
	insb((unsigned long) (p), (dst), (count))
#define ioread16_rep(p, dst, count) \
	insw((unsigned long) (p), (dst), (count))
#define ioread32_rep(p, dst, count) \
	insl((unsigned long) (p), (dst), (count))

#define iowrite8_rep(p, src, count) \
	outsb((unsigned long) (p), (src), (count))
#define iowrite16_rep(p, src, count) \
	outsw((unsigned long) (p), (src), (count))
#define iowrite32_rep(p, src, count) \
	outsl((unsigned long) (p), (src), (count))
#endif /* CONFIG_GENERIC_IOMAP */

#ifndef IO_SPACE_LIMIT
#define IO_SPACE_LIMIT 0xffff
#endif

#ifdef __KERNEL__

#include <linux/vmalloc.h>
#define __io_virt(x) ((void __force *) (x))

#ifndef CONFIG_GENERIC_IOMAP
struct pci_dev;
extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);

#ifndef pci_iounmap
static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
{
}
#endif
#endif /* CONFIG_GENERIC_IOMAP */

/*
 * Change virtual addresses to physical addresses and vv.
 * These are pretty trivial
 */
#ifndef virt_to_phys
static inline unsigned long virt_to_phys(volatile void *address)
{
	return __pa((unsigned long)address);
}

static inline void *phys_to_virt(unsigned long address)
{
	return __va(address);
}
#endif

/*
 * Change "struct page" to physical address.
 *
 * This implementation is for the no-MMU case only... if you have an MMU
 * you'll need to provide your own definitions.
 */
#ifndef CONFIG_MMU
static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
{
	return (void __iomem*) (unsigned long)offset;
}

#define __ioremap(offset, size, flags)	ioremap(offset, size)

#ifndef ioremap_nocache
#define ioremap_nocache ioremap
#endif

#ifndef ioremap_wc
#define ioremap_wc ioremap_nocache
#endif

static inline void iounmap(void __iomem *addr)
{
}
#endif /* CONFIG_MMU */

#ifdef CONFIG_HAS_IOPORT
#ifndef CONFIG_GENERIC_IOMAP
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
	return (void __iomem *) port;
}

static inline void ioport_unmap(void __iomem *p)
{
}
#else /* CONFIG_GENERIC_IOMAP */
extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
extern void ioport_unmap(void __iomem *p);
#endif /* CONFIG_GENERIC_IOMAP */
#endif /* CONFIG_HAS_IOPORT */

#define xlate_dev_kmem_ptr(p)	p
#define xlate_dev_mem_ptr(p)	__va(p)

#ifndef virt_to_bus
static inline unsigned long virt_to_bus(volatile void *address)
{
	return ((unsigned long) address);
}

static inline void *bus_to_virt(unsigned long address)
{
	return (void *) address;
}
#endif

#ifndef memset_io
#define memset_io(a, b, c)	memset(__io_virt(a), (b), (c))
#endif

#ifndef memcpy_fromio
#define memcpy_fromio(a, b, c)	memcpy((a), __io_virt(b), (c))
#endif
#ifndef memcpy_toio
#define memcpy_toio(a, b, c)	memcpy(__io_virt(a), (b), (c))
#endif

#endif /* __KERNEL__ */

#endif /* __ASM_GENERIC_IO_H */