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 <linux/types.h>
16
17 #ifdef CONFIG_GENERIC_IOMAP
18 #include <asm-generic/iomap.h>
19 #endif
20
21 #include <asm-generic/pci_iomap.h>
22
23 #ifndef mmiowb
24 #define mmiowb() do {} while (0)
25 #endif
26
27 /*****************************************************************************/
28 /*
29 * readX/writeX() are used to access memory mapped devices. On some
30 * architectures the memory mapped IO stuff needs to be accessed
31 * differently. On the simple architectures, we just read/write the
32 * memory location directly.
33 */
34 #ifndef __raw_readb
__raw_readb(const volatile void __iomem * addr)35 static inline u8 __raw_readb(const volatile void __iomem *addr)
36 {
37 return *(const volatile u8 __force *) addr;
38 }
39 #endif
40
41 #ifndef __raw_readw
__raw_readw(const volatile void __iomem * addr)42 static inline u16 __raw_readw(const volatile void __iomem *addr)
43 {
44 return *(const volatile u16 __force *) addr;
45 }
46 #endif
47
48 #ifndef __raw_readl
__raw_readl(const volatile void __iomem * addr)49 static inline u32 __raw_readl(const volatile void __iomem *addr)
50 {
51 return *(const volatile u32 __force *) addr;
52 }
53 #endif
54
55 #define readb __raw_readb
56
57 #define readw readw
readw(const volatile void __iomem * addr)58 static inline u16 readw(const volatile void __iomem *addr)
59 {
60 return __le16_to_cpu(__raw_readw(addr));
61 }
62
63 #define readl readl
readl(const volatile void __iomem * addr)64 static inline u32 readl(const volatile void __iomem *addr)
65 {
66 return __le32_to_cpu(__raw_readl(addr));
67 }
68
69 #ifndef __raw_writeb
__raw_writeb(u8 b,volatile void __iomem * addr)70 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
71 {
72 *(volatile u8 __force *) addr = b;
73 }
74 #endif
75
76 #ifndef __raw_writew
__raw_writew(u16 b,volatile void __iomem * addr)77 static inline void __raw_writew(u16 b, volatile void __iomem *addr)
78 {
79 *(volatile u16 __force *) addr = b;
80 }
81 #endif
82
83 #ifndef __raw_writel
__raw_writel(u32 b,volatile void __iomem * addr)84 static inline void __raw_writel(u32 b, volatile void __iomem *addr)
85 {
86 *(volatile u32 __force *) addr = b;
87 }
88 #endif
89
90 #define writeb __raw_writeb
91 #define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
92 #define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
93
94 #ifdef CONFIG_64BIT
95 #ifndef __raw_readq
__raw_readq(const volatile void __iomem * addr)96 static inline u64 __raw_readq(const volatile void __iomem *addr)
97 {
98 return *(const volatile u64 __force *) addr;
99 }
100 #endif
101
102 #define readq readq
readq(const volatile void __iomem * addr)103 static inline u64 readq(const volatile void __iomem *addr)
104 {
105 return __le64_to_cpu(__raw_readq(addr));
106 }
107
108 #ifndef __raw_writeq
__raw_writeq(u64 b,volatile void __iomem * addr)109 static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
110 {
111 *(volatile u64 __force *) addr = b;
112 }
113 #endif
114
115 #define writeq(b, addr) __raw_writeq(__cpu_to_le64(b), addr)
116 #endif /* CONFIG_64BIT */
117
118 #ifndef PCI_IOBASE
119 #define PCI_IOBASE ((void __iomem *) 0)
120 #endif
121
122 /*****************************************************************************/
123 /*
124 * traditional input/output functions
125 */
126
inb(unsigned long addr)127 static inline u8 inb(unsigned long addr)
128 {
129 return readb(addr + PCI_IOBASE);
130 }
131
inw(unsigned long addr)132 static inline u16 inw(unsigned long addr)
133 {
134 return readw(addr + PCI_IOBASE);
135 }
136
inl(unsigned long addr)137 static inline u32 inl(unsigned long addr)
138 {
139 return readl(addr + PCI_IOBASE);
140 }
141
outb(u8 b,unsigned long addr)142 static inline void outb(u8 b, unsigned long addr)
143 {
144 writeb(b, addr + PCI_IOBASE);
145 }
146
outw(u16 b,unsigned long addr)147 static inline void outw(u16 b, unsigned long addr)
148 {
149 writew(b, addr + PCI_IOBASE);
150 }
151
outl(u32 b,unsigned long addr)152 static inline void outl(u32 b, unsigned long addr)
153 {
154 writel(b, addr + PCI_IOBASE);
155 }
156
157 #define inb_p(addr) inb(addr)
158 #define inw_p(addr) inw(addr)
159 #define inl_p(addr) inl(addr)
160 #define outb_p(x, addr) outb((x), (addr))
161 #define outw_p(x, addr) outw((x), (addr))
162 #define outl_p(x, addr) outl((x), (addr))
163
164 #ifndef insb
insb(unsigned long addr,void * buffer,int count)165 static inline void insb(unsigned long addr, void *buffer, int count)
166 {
167 if (count) {
168 u8 *buf = buffer;
169 do {
170 u8 x = __raw_readb(addr + PCI_IOBASE);
171 *buf++ = x;
172 } while (--count);
173 }
174 }
175 #endif
176
177 #ifndef insw
insw(unsigned long addr,void * buffer,int count)178 static inline void insw(unsigned long addr, void *buffer, int count)
179 {
180 if (count) {
181 u16 *buf = buffer;
182 do {
183 u16 x = __raw_readw(addr + PCI_IOBASE);
184 *buf++ = x;
185 } while (--count);
186 }
187 }
188 #endif
189
190 #ifndef insl
insl(unsigned long addr,void * buffer,int count)191 static inline void insl(unsigned long addr, void *buffer, int count)
192 {
193 if (count) {
194 u32 *buf = buffer;
195 do {
196 u32 x = __raw_readl(addr + PCI_IOBASE);
197 *buf++ = x;
198 } while (--count);
199 }
200 }
201 #endif
202
203 #ifndef outsb
outsb(unsigned long addr,const void * buffer,int count)204 static inline void outsb(unsigned long addr, const void *buffer, int count)
205 {
206 if (count) {
207 const u8 *buf = buffer;
208 do {
209 __raw_writeb(*buf++, addr + PCI_IOBASE);
210 } while (--count);
211 }
212 }
213 #endif
214
215 #ifndef outsw
outsw(unsigned long addr,const void * buffer,int count)216 static inline void outsw(unsigned long addr, const void *buffer, int count)
217 {
218 if (count) {
219 const u16 *buf = buffer;
220 do {
221 __raw_writew(*buf++, addr + PCI_IOBASE);
222 } while (--count);
223 }
224 }
225 #endif
226
227 #ifndef outsl
outsl(unsigned long addr,const void * buffer,int count)228 static inline void outsl(unsigned long addr, const void *buffer, int count)
229 {
230 if (count) {
231 const u32 *buf = buffer;
232 do {
233 __raw_writel(*buf++, addr + PCI_IOBASE);
234 } while (--count);
235 }
236 }
237 #endif
238
239 #ifndef CONFIG_GENERIC_IOMAP
240 #define ioread8(addr) readb(addr)
241 #define ioread16(addr) readw(addr)
242 #define ioread16be(addr) __be16_to_cpu(__raw_readw(addr))
243 #define ioread32(addr) readl(addr)
244 #define ioread32be(addr) __be32_to_cpu(__raw_readl(addr))
245
246 #define iowrite8(v, addr) writeb((v), (addr))
247 #define iowrite16(v, addr) writew((v), (addr))
248 #define iowrite16be(v, addr) __raw_writew(__cpu_to_be16(v), addr)
249 #define iowrite32(v, addr) writel((v), (addr))
250 #define iowrite32be(v, addr) __raw_writel(__cpu_to_be32(v), addr)
251
252 #define ioread8_rep(p, dst, count) \
253 insb((unsigned long) (p), (dst), (count))
254 #define ioread16_rep(p, dst, count) \
255 insw((unsigned long) (p), (dst), (count))
256 #define ioread32_rep(p, dst, count) \
257 insl((unsigned long) (p), (dst), (count))
258
259 #define iowrite8_rep(p, src, count) \
260 outsb((unsigned long) (p), (src), (count))
261 #define iowrite16_rep(p, src, count) \
262 outsw((unsigned long) (p), (src), (count))
263 #define iowrite32_rep(p, src, count) \
264 outsl((unsigned long) (p), (src), (count))
265 #endif /* CONFIG_GENERIC_IOMAP */
266
267 #ifndef IO_SPACE_LIMIT
268 #define IO_SPACE_LIMIT 0xffff
269 #endif
270
271 #ifdef __KERNEL__
272
273 #include <linux/vmalloc.h>
274 #define __io_virt(x) ((void __force *) (x))
275
276 #ifndef CONFIG_GENERIC_IOMAP
277 struct pci_dev;
278 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
279
280 #ifndef pci_iounmap
pci_iounmap(struct pci_dev * dev,void __iomem * p)281 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
282 {
283 }
284 #endif
285 #endif /* CONFIG_GENERIC_IOMAP */
286
287 /*
288 * Change virtual addresses to physical addresses and vv.
289 * These are pretty trivial
290 */
291 #ifndef virt_to_phys
virt_to_phys(volatile void * address)292 static inline unsigned long virt_to_phys(volatile void *address)
293 {
294 return __pa((unsigned long)address);
295 }
296
phys_to_virt(unsigned long address)297 static inline void *phys_to_virt(unsigned long address)
298 {
299 return __va(address);
300 }
301 #endif
302
303 /*
304 * Change "struct page" to physical address.
305 *
306 * This implementation is for the no-MMU case only... if you have an MMU
307 * you'll need to provide your own definitions.
308 */
309 #ifndef CONFIG_MMU
ioremap(phys_addr_t offset,unsigned long size)310 static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
311 {
312 return (void __iomem*) (unsigned long)offset;
313 }
314
315 #define __ioremap(offset, size, flags) ioremap(offset, size)
316
317 #ifndef ioremap_nocache
318 #define ioremap_nocache ioremap
319 #endif
320
321 #ifndef ioremap_wc
322 #define ioremap_wc ioremap_nocache
323 #endif
324
iounmap(void __iomem * addr)325 static inline void iounmap(void __iomem *addr)
326 {
327 }
328 #endif /* CONFIG_MMU */
329
330 #ifdef CONFIG_HAS_IOPORT_MAP
331 #ifndef CONFIG_GENERIC_IOMAP
ioport_map(unsigned long port,unsigned int nr)332 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
333 {
334 return PCI_IOBASE + (port & IO_SPACE_LIMIT);
335 }
336
ioport_unmap(void __iomem * p)337 static inline void ioport_unmap(void __iomem *p)
338 {
339 }
340 #else /* CONFIG_GENERIC_IOMAP */
341 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
342 extern void ioport_unmap(void __iomem *p);
343 #endif /* CONFIG_GENERIC_IOMAP */
344 #endif /* CONFIG_HAS_IOPORT_MAP */
345
346 #ifndef xlate_dev_kmem_ptr
347 #define xlate_dev_kmem_ptr(p) p
348 #endif
349 #ifndef xlate_dev_mem_ptr
350 #define xlate_dev_mem_ptr(p) __va(p)
351 #endif
352
353 #ifdef CONFIG_VIRT_TO_BUS
354 #ifndef virt_to_bus
virt_to_bus(volatile void * address)355 static inline unsigned long virt_to_bus(volatile void *address)
356 {
357 return ((unsigned long) address);
358 }
359
bus_to_virt(unsigned long address)360 static inline void *bus_to_virt(unsigned long address)
361 {
362 return (void *) address;
363 }
364 #endif
365 #endif
366
367 #ifndef memset_io
368 #define memset_io(a, b, c) memset(__io_virt(a), (b), (c))
369 #endif
370
371 #ifndef memcpy_fromio
372 #define memcpy_fromio(a, b, c) memcpy((a), __io_virt(b), (c))
373 #endif
374 #ifndef memcpy_toio
375 #define memcpy_toio(a, b, c) memcpy(__io_virt(a), (b), (c))
376 #endif
377
378 #endif /* __KERNEL__ */
379
380 #endif /* __ASM_GENERIC_IO_H */
381