xref: /openbmc/linux/include/asm-generic/io.h (revision 565d76cb)
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 (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 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 #ifndef mmiowb
23 #define mmiowb() do {} while (0)
24 #endif
25 
26 /*****************************************************************************/
27 /*
28  * readX/writeX() are used to access memory mapped devices. On some
29  * architectures the memory mapped IO stuff needs to be accessed
30  * differently. On the simple architectures, we just read/write the
31  * memory location directly.
32  */
33 #ifndef __raw_readb
34 static inline u8 __raw_readb(const volatile void __iomem *addr)
35 {
36 	return *(const volatile u8 __force *) addr;
37 }
38 #endif
39 
40 #ifndef __raw_readw
41 static inline u16 __raw_readw(const volatile void __iomem *addr)
42 {
43 	return *(const volatile u16 __force *) addr;
44 }
45 #endif
46 
47 #ifndef __raw_readl
48 static inline u32 __raw_readl(const volatile void __iomem *addr)
49 {
50 	return *(const volatile u32 __force *) addr;
51 }
52 #endif
53 
54 #define readb __raw_readb
55 #define readw(addr) __le16_to_cpu(__raw_readw(addr))
56 #define readl(addr) __le32_to_cpu(__raw_readl(addr))
57 
58 #ifndef __raw_writeb
59 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
60 {
61 	*(volatile u8 __force *) addr = b;
62 }
63 #endif
64 
65 #ifndef __raw_writew
66 static inline void __raw_writew(u16 b, volatile void __iomem *addr)
67 {
68 	*(volatile u16 __force *) addr = b;
69 }
70 #endif
71 
72 #ifndef __raw_writel
73 static inline void __raw_writel(u32 b, volatile void __iomem *addr)
74 {
75 	*(volatile u32 __force *) addr = b;
76 }
77 #endif
78 
79 #define writeb __raw_writeb
80 #define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
81 #define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
82 
83 #ifdef CONFIG_64BIT
84 static inline u64 __raw_readq(const volatile void __iomem *addr)
85 {
86 	return *(const volatile u64 __force *) addr;
87 }
88 #define readq(addr) __le64_to_cpu(__raw_readq(addr))
89 
90 static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
91 {
92 	*(volatile u64 __force *) addr = b;
93 }
94 #define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr)
95 #endif
96 
97 #ifndef PCI_IOBASE
98 #define PCI_IOBASE ((void __iomem *) 0)
99 #endif
100 
101 /*****************************************************************************/
102 /*
103  * traditional input/output functions
104  */
105 
106 static inline u8 inb(unsigned long addr)
107 {
108 	return readb(addr + PCI_IOBASE);
109 }
110 
111 static inline u16 inw(unsigned long addr)
112 {
113 	return readw(addr + PCI_IOBASE);
114 }
115 
116 static inline u32 inl(unsigned long addr)
117 {
118 	return readl(addr + PCI_IOBASE);
119 }
120 
121 static inline void outb(u8 b, unsigned long addr)
122 {
123 	writeb(b, addr + PCI_IOBASE);
124 }
125 
126 static inline void outw(u16 b, unsigned long addr)
127 {
128 	writew(b, addr + PCI_IOBASE);
129 }
130 
131 static inline void outl(u32 b, unsigned long addr)
132 {
133 	writel(b, addr + PCI_IOBASE);
134 }
135 
136 #define inb_p(addr)	inb(addr)
137 #define inw_p(addr)	inw(addr)
138 #define inl_p(addr)	inl(addr)
139 #define outb_p(x, addr)	outb((x), (addr))
140 #define outw_p(x, addr)	outw((x), (addr))
141 #define outl_p(x, addr)	outl((x), (addr))
142 
143 #ifndef insb
144 static inline void insb(unsigned long addr, void *buffer, int count)
145 {
146 	if (count) {
147 		u8 *buf = buffer;
148 		do {
149 			u8 x = inb(addr);
150 			*buf++ = x;
151 		} while (--count);
152 	}
153 }
154 #endif
155 
156 #ifndef insw
157 static inline void insw(unsigned long addr, void *buffer, int count)
158 {
159 	if (count) {
160 		u16 *buf = buffer;
161 		do {
162 			u16 x = inw(addr);
163 			*buf++ = x;
164 		} while (--count);
165 	}
166 }
167 #endif
168 
169 #ifndef insl
170 static inline void insl(unsigned long addr, void *buffer, int count)
171 {
172 	if (count) {
173 		u32 *buf = buffer;
174 		do {
175 			u32 x = inl(addr);
176 			*buf++ = x;
177 		} while (--count);
178 	}
179 }
180 #endif
181 
182 #ifndef outsb
183 static inline void outsb(unsigned long addr, const void *buffer, int count)
184 {
185 	if (count) {
186 		const u8 *buf = buffer;
187 		do {
188 			outb(*buf++, addr);
189 		} while (--count);
190 	}
191 }
192 #endif
193 
194 #ifndef outsw
195 static inline void outsw(unsigned long addr, const void *buffer, int count)
196 {
197 	if (count) {
198 		const u16 *buf = buffer;
199 		do {
200 			outw(*buf++, addr);
201 		} while (--count);
202 	}
203 }
204 #endif
205 
206 #ifndef outsl
207 static inline void outsl(unsigned long addr, const void *buffer, int count)
208 {
209 	if (count) {
210 		const u32 *buf = buffer;
211 		do {
212 			outl(*buf++, addr);
213 		} while (--count);
214 	}
215 }
216 #endif
217 
218 static inline void readsl(const void __iomem *addr, void *buf, int len)
219 {
220 	insl(addr - PCI_IOBASE, buf, len);
221 }
222 
223 static inline void readsw(const void __iomem *addr, void *buf, int len)
224 {
225 	insw(addr - PCI_IOBASE, buf, len);
226 }
227 
228 static inline void readsb(const void __iomem *addr, void *buf, int len)
229 {
230 	insb(addr - PCI_IOBASE, buf, len);
231 }
232 
233 static inline void writesl(const void __iomem *addr, const void *buf, int len)
234 {
235 	outsl(addr - PCI_IOBASE, buf, len);
236 }
237 
238 static inline void writesw(const void __iomem *addr, const void *buf, int len)
239 {
240 	outsw(addr - PCI_IOBASE, buf, len);
241 }
242 
243 static inline void writesb(const void __iomem *addr, const void *buf, int len)
244 {
245 	outsb(addr - PCI_IOBASE, buf, len);
246 }
247 
248 #ifndef CONFIG_GENERIC_IOMAP
249 #define ioread8(addr)		readb(addr)
250 #define ioread16(addr)		readw(addr)
251 #define ioread16be(addr)	be16_to_cpu(ioread16(addr))
252 #define ioread32(addr)		readl(addr)
253 #define ioread32be(addr)	be32_to_cpu(ioread32(addr))
254 
255 #define iowrite8(v, addr)	writeb((v), (addr))
256 #define iowrite16(v, addr)	writew((v), (addr))
257 #define iowrite16be(v, addr)	iowrite16(be16_to_cpu(v), (addr))
258 #define iowrite32(v, addr)	writel((v), (addr))
259 #define iowrite32be(v, addr)	iowrite32(be32_to_cpu(v), (addr))
260 
261 #define ioread8_rep(p, dst, count) \
262 	insb((unsigned long) (p), (dst), (count))
263 #define ioread16_rep(p, dst, count) \
264 	insw((unsigned long) (p), (dst), (count))
265 #define ioread32_rep(p, dst, count) \
266 	insl((unsigned long) (p), (dst), (count))
267 
268 #define iowrite8_rep(p, src, count) \
269 	outsb((unsigned long) (p), (src), (count))
270 #define iowrite16_rep(p, src, count) \
271 	outsw((unsigned long) (p), (src), (count))
272 #define iowrite32_rep(p, src, count) \
273 	outsl((unsigned long) (p), (src), (count))
274 #endif /* CONFIG_GENERIC_IOMAP */
275 
276 #ifndef IO_SPACE_LIMIT
277 #define IO_SPACE_LIMIT 0xffff
278 #endif
279 
280 #ifdef __KERNEL__
281 
282 #include <linux/vmalloc.h>
283 #define __io_virt(x) ((void __force *) (x))
284 
285 #ifndef CONFIG_GENERIC_IOMAP
286 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
287 struct pci_dev;
288 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
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 static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
312 {
313 	return (void __iomem*) (unsigned long)offset;
314 }
315 
316 #define __ioremap(offset, size, flags)	ioremap(offset, size)
317 
318 #ifndef ioremap_nocache
319 #define ioremap_nocache ioremap
320 #endif
321 
322 #ifndef ioremap_wc
323 #define ioremap_wc ioremap_nocache
324 #endif
325 
326 static inline void iounmap(void *addr)
327 {
328 }
329 
330 #ifndef CONFIG_GENERIC_IOMAP
331 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
332 {
333 	return (void __iomem *) port;
334 }
335 
336 static inline void ioport_unmap(void __iomem *p)
337 {
338 }
339 #else /* CONFIG_GENERIC_IOMAP */
340 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
341 extern void ioport_unmap(void __iomem *p);
342 #endif /* CONFIG_GENERIC_IOMAP */
343 
344 #define xlate_dev_kmem_ptr(p)	p
345 #define xlate_dev_mem_ptr(p)	((void *) (p))
346 
347 #ifndef virt_to_bus
348 static inline unsigned long virt_to_bus(volatile void *address)
349 {
350 	return ((unsigned long) address);
351 }
352 
353 static inline void *bus_to_virt(unsigned long address)
354 {
355 	return (void *) address;
356 }
357 #endif
358 
359 #define memset_io(a, b, c)	memset(__io_virt(a), (b), (c))
360 #define memcpy_fromio(a, b, c)	memcpy((a), __io_virt(b), (c))
361 #define memcpy_toio(a, b, c)	memcpy(__io_virt(a), (b), (c))
362 
363 #endif /* __KERNEL__ */
364 
365 #endif /* __ASM_GENERIC_IO_H */
366