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io.h
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1 /* Generic I/O port emulation, based on MN10300 code
2  *
3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells ([email protected])
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public Licence
8  * as published by the Free Software Foundation; either version
9  * 2 of the Licence, or (at your option) any later version.
10  */
11 #ifndef __ASM_GENERIC_IO_H
12 #define __ASM_GENERIC_IO_H
13 
14 #include <asm/page.h> /* I/O is all done through memory accesses */
15 #include <asm/cacheflush.h>
16 #include <linux/types.h>
17 
18 #ifdef CONFIG_GENERIC_IOMAP
19 #include <asm-generic/iomap.h>
20 #endif
21 
22 #include <asm-generic/pci_iomap.h>
23 
24 #ifndef mmiowb
25 #define mmiowb() do {} while (0)
26 #endif
27 
28 /*****************************************************************************/
29 /*
30  * readX/writeX() are used to access memory mapped devices. On some
31  * architectures the memory mapped IO stuff needs to be accessed
32  * differently. On the simple architectures, we just read/write the
33  * memory location directly.
34  */
35 #ifndef __raw_readb
36 static inline u8 __raw_readb(const volatile void __iomem *addr)
37 {
38  return *(const volatile u8 __force *) addr;
39 }
40 #endif
41 
42 #ifndef __raw_readw
43 static inline u16 __raw_readw(const volatile void __iomem *addr)
44 {
45  return *(const volatile u16 __force *) addr;
46 }
47 #endif
48 
49 #ifndef __raw_readl
50 static inline u32 __raw_readl(const volatile void __iomem *addr)
51 {
52  return *(const volatile u32 __force *) addr;
53 }
54 #endif
55 
56 #define readb __raw_readb
57 #define readw(addr) __le16_to_cpu(__raw_readw(addr))
58 #define readl(addr) __le32_to_cpu(__raw_readl(addr))
59 
60 #ifndef __raw_writeb
61 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
62 {
63  *(volatile u8 __force *) addr = b;
64 }
65 #endif
66 
67 #ifndef __raw_writew
68 static inline void __raw_writew(u16 b, volatile void __iomem *addr)
69 {
70  *(volatile u16 __force *) addr = b;
71 }
72 #endif
73 
74 #ifndef __raw_writel
75 static inline void __raw_writel(u32 b, volatile void __iomem *addr)
76 {
77  *(volatile u32 __force *) addr = b;
78 }
79 #endif
80 
81 #define writeb __raw_writeb
82 #define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
83 #define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
84 
85 #ifdef CONFIG_64BIT
86 static inline u64 __raw_readq(const volatile void __iomem *addr)
87 {
88  return *(const volatile u64 __force *) addr;
89 }
90 #define readq(addr) __le64_to_cpu(__raw_readq(addr))
91 
92 static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
93 {
94  *(volatile u64 __force *) addr = b;
95 }
96 #define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr)
97 #endif
98 
99 #ifndef PCI_IOBASE
100 #define PCI_IOBASE ((void __iomem *) 0)
101 #endif
102 
103 /*****************************************************************************/
104 /*
105  * traditional input/output functions
106  */
107 
108 static inline u8 inb(unsigned long addr)
109 {
110  return readb(addr + PCI_IOBASE);
111 }
112 
113 static inline u16 inw(unsigned long addr)
114 {
115  return readw(addr + PCI_IOBASE);
116 }
117 
118 static inline u32 inl(unsigned long addr)
119 {
120  return readl(addr + PCI_IOBASE);
121 }
122 
123 static inline void outb(u8 b, unsigned long addr)
124 {
125  writeb(b, addr + PCI_IOBASE);
126 }
127 
128 static inline void outw(u16 b, unsigned long addr)
129 {
130  writew(b, addr + PCI_IOBASE);
131 }
132 
133 static inline void outl(u32 b, unsigned long addr)
134 {
135  writel(b, addr + PCI_IOBASE);
136 }
137 
138 #define inb_p(addr) inb(addr)
139 #define inw_p(addr) inw(addr)
140 #define inl_p(addr) inl(addr)
141 #define outb_p(x, addr) outb((x), (addr))
142 #define outw_p(x, addr) outw((x), (addr))
143 #define outl_p(x, addr) outl((x), (addr))
144 
145 #ifndef insb
146 static inline void insb(unsigned long addr, void *buffer, int count)
147 {
148  if (count) {
149  u8 *buf = buffer;
150  do {
151  u8 x = inb(addr);
152  *buf++ = x;
153  } while (--count);
154  }
155 }
156 #endif
157 
158 #ifndef insw
159 static inline void insw(unsigned long addr, void *buffer, int count)
160 {
161  if (count) {
162  u16 *buf = buffer;
163  do {
164  u16 x = inw(addr);
165  *buf++ = x;
166  } while (--count);
167  }
168 }
169 #endif
170 
171 #ifndef insl
172 static inline void insl(unsigned long addr, void *buffer, int count)
173 {
174  if (count) {
175  u32 *buf = buffer;
176  do {
177  u32 x = inl(addr);
178  *buf++ = x;
179  } while (--count);
180  }
181 }
182 #endif
183 
184 #ifndef outsb
185 static inline void outsb(unsigned long addr, const void *buffer, int count)
186 {
187  if (count) {
188  const u8 *buf = buffer;
189  do {
190  outb(*buf++, addr);
191  } while (--count);
192  }
193 }
194 #endif
195 
196 #ifndef outsw
197 static inline void outsw(unsigned long addr, const void *buffer, int count)
198 {
199  if (count) {
200  const u16 *buf = buffer;
201  do {
202  outw(*buf++, addr);
203  } while (--count);
204  }
205 }
206 #endif
207 
208 #ifndef outsl
209 static inline void outsl(unsigned long addr, const void *buffer, int count)
210 {
211  if (count) {
212  const u32 *buf = buffer;
213  do {
214  outl(*buf++, addr);
215  } while (--count);
216  }
217 }
218 #endif
219 
220 static inline void readsl(const void __iomem *addr, void *buf, int len)
221 {
222  insl(addr - PCI_IOBASE, buf, len);
223 }
224 
225 static inline void readsw(const void __iomem *addr, void *buf, int len)
226 {
227  insw(addr - PCI_IOBASE, buf, len);
228 }
229 
230 static inline void readsb(const void __iomem *addr, void *buf, int len)
231 {
232  insb(addr - PCI_IOBASE, buf, len);
233 }
234 
235 static inline void writesl(const void __iomem *addr, const void *buf, int len)
236 {
237  outsl(addr - PCI_IOBASE, buf, len);
238 }
239 
240 static inline void writesw(const void __iomem *addr, const void *buf, int len)
241 {
242  outsw(addr - PCI_IOBASE, buf, len);
243 }
244 
245 static inline void writesb(const void __iomem *addr, const void *buf, int len)
246 {
247  outsb(addr - PCI_IOBASE, buf, len);
248 }
249 
250 #ifndef CONFIG_GENERIC_IOMAP
251 #define ioread8(addr) readb(addr)
252 #define ioread16(addr) readw(addr)
253 #define ioread16be(addr) be16_to_cpu(ioread16(addr))
254 #define ioread32(addr) readl(addr)
255 #define ioread32be(addr) be32_to_cpu(ioread32(addr))
256 
257 #define iowrite8(v, addr) writeb((v), (addr))
258 #define iowrite16(v, addr) writew((v), (addr))
259 #define iowrite16be(v, addr) iowrite16(be16_to_cpu(v), (addr))
260 #define iowrite32(v, addr) writel((v), (addr))
261 #define iowrite32be(v, addr) iowrite32(be32_to_cpu(v), (addr))
262 
263 #define ioread8_rep(p, dst, count) \
264  insb((unsigned long) (p), (dst), (count))
265 #define ioread16_rep(p, dst, count) \
266  insw((unsigned long) (p), (dst), (count))
267 #define ioread32_rep(p, dst, count) \
268  insl((unsigned long) (p), (dst), (count))
269 
270 #define iowrite8_rep(p, src, count) \
271  outsb((unsigned long) (p), (src), (count))
272 #define iowrite16_rep(p, src, count) \
273  outsw((unsigned long) (p), (src), (count))
274 #define iowrite32_rep(p, src, count) \
275  outsl((unsigned long) (p), (src), (count))
276 #endif /* CONFIG_GENERIC_IOMAP */
277 
278 #ifndef IO_SPACE_LIMIT
279 #define IO_SPACE_LIMIT 0xffff
280 #endif
281 
282 #ifdef __KERNEL__
283 
284 #include <linux/vmalloc.h>
285 #define __io_virt(x) ((void __force *) (x))
286 
287 #ifndef CONFIG_GENERIC_IOMAP
288 struct pci_dev;
289 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
290 {
291 }
292 #endif /* CONFIG_GENERIC_IOMAP */
293 
294 /*
295  * Change virtual addresses to physical addresses and vv.
296  * These are pretty trivial
297  */
298 static inline unsigned long virt_to_phys(volatile void *address)
299 {
300  return __pa((unsigned long)address);
301 }
302 
303 static inline void *phys_to_virt(unsigned long address)
304 {
305  return __va(address);
306 }
307 
308 /*
309  * Change "struct page" to physical address.
310  *
311  * This implementation is for the no-MMU case only... if you have an MMU
312  * you'll need to provide your own definitions.
313  */
314 #ifndef CONFIG_MMU
315 static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
316 {
317  return (void __iomem*) (unsigned long)offset;
318 }
319 
320 #define __ioremap(offset, size, flags) ioremap(offset, size)
321 
322 #ifndef ioremap_nocache
323 #define ioremap_nocache ioremap
324 #endif
325 
326 #ifndef ioremap_wc
327 #define ioremap_wc ioremap_nocache
328 #endif
329 
330 static inline void iounmap(void __iomem *addr)
331 {
332 }
333 #endif /* CONFIG_MMU */
334 
335 #ifdef CONFIG_HAS_IOPORT
336 #ifndef CONFIG_GENERIC_IOMAP
337 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
338 {
339  return (void __iomem *) port;
340 }
341 
342 static inline void ioport_unmap(void __iomem *p)
343 {
344 }
345 #else /* CONFIG_GENERIC_IOMAP */
346 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
347 extern void ioport_unmap(void __iomem *p);
348 #endif /* CONFIG_GENERIC_IOMAP */
349 #endif /* CONFIG_HAS_IOPORT */
350 
351 #define xlate_dev_kmem_ptr(p) p
352 #define xlate_dev_mem_ptr(p) __va(p)
353 
354 #ifndef virt_to_bus
355 static inline unsigned long virt_to_bus(volatile void *address)
356 {
357  return ((unsigned long) address);
358 }
359 
360 static inline void *bus_to_virt(unsigned long address)
361 {
362  return (void *) address;
363 }
364 #endif
365 
366 #define memset_io(a, b, c) memset(__io_virt(a), (b), (c))
367 #define memcpy_fromio(a, b, c) memcpy((a), __io_virt(b), (c))
368 #define memcpy_toio(a, b, c) memcpy(__io_virt(a), (b), (c))
369 
370 #endif /* __KERNEL__ */
371 
372 #endif /* __ASM_GENERIC_IO_H */