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 #include <linux/types.h>
21 #include <asm/virtconvert.h>
22 #include <asm/string.h>
23 #include <asm/mb-regs.h>
24 #include <linux/delay.h>
25
26 /*
27 * swap functions are sometimes needed to interface little-endian hardware
28 */
29
_swapw(unsigned short v)30 static inline unsigned short _swapw(unsigned short v)
31 {
32 return ((v << 8) | (v >> 8));
33 }
34
_swapl(unsigned long v)35 static inline unsigned long _swapl(unsigned long v)
36 {
37 return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
38 }
39
40 //#define __iormb() asm volatile("membar")
41 //#define __iowmb() asm volatile("membar")
42
43 #define __raw_readb __builtin_read8
44 #define __raw_readw __builtin_read16
45 #define __raw_readl __builtin_read32
46
47 #define __raw_writeb(datum, addr) __builtin_write8(addr, datum)
48 #define __raw_writew(datum, addr) __builtin_write16(addr, datum)
49 #define __raw_writel(datum, addr) __builtin_write32(addr, datum)
50
io_outsb(unsigned int addr,const void * buf,int len)51 static inline void io_outsb(unsigned int addr, const void *buf, int len)
52 {
53 unsigned long __ioaddr = (unsigned long) addr;
54 const uint8_t *bp = buf;
55
56 while (len--)
57 __builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
58 }
59
io_outsw(unsigned int addr,const void * buf,int len)60 static inline void io_outsw(unsigned int addr, const void *buf, int len)
61 {
62 unsigned long __ioaddr = (unsigned long) addr;
63 const uint16_t *bp = buf;
64
65 while (len--)
66 __builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
67 }
68
69 extern void __outsl_ns(unsigned int addr, const void *buf, int len);
70 extern void __outsl_sw(unsigned int addr, const void *buf, int len);
__outsl(unsigned int addr,const void * buf,int len,int swap)71 static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
72 {
73 unsigned long __ioaddr = (unsigned long) addr;
74
75 if (!swap)
76 __outsl_ns(__ioaddr, buf, len);
77 else
78 __outsl_sw(__ioaddr, buf, len);
79 }
80
io_insb(unsigned long addr,void * buf,int len)81 static inline void io_insb(unsigned long addr, void *buf, int len)
82 {
83 uint8_t *bp = buf;
84
85 while (len--)
86 *bp++ = __builtin_read8((volatile void __iomem *) addr);
87 }
88
io_insw(unsigned long addr,void * buf,int len)89 static inline void io_insw(unsigned long addr, void *buf, int len)
90 {
91 uint16_t *bp = buf;
92
93 while (len--)
94 *bp++ = __builtin_read16((volatile void __iomem *) addr);
95 }
96
97 extern void __insl_ns(unsigned long addr, void *buf, int len);
98 extern void __insl_sw(unsigned long addr, void *buf, int len);
__insl(unsigned long addr,void * buf,int len,int swap)99 static inline void __insl(unsigned long addr, void *buf, int len, int swap)
100 {
101 if (!swap)
102 __insl_ns(addr, buf, len);
103 else
104 __insl_sw(addr, buf, len);
105 }
106
107 #define mmiowb() mb()
108
109 /*
110 * make the short names macros so specific devices
111 * can override them as required
112 */
113
memset_io(volatile void __iomem * addr,unsigned char val,int count)114 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
115 {
116 memset((void __force *) addr, val, count);
117 }
118
memcpy_fromio(void * dst,const volatile void __iomem * src,int count)119 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
120 {
121 memcpy(dst, (void __force *) src, count);
122 }
123
memcpy_toio(volatile void __iomem * dst,const void * src,int count)124 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
125 {
126 memcpy((void __force *) dst, src, count);
127 }
128
inb(unsigned long addr)129 static inline uint8_t inb(unsigned long addr)
130 {
131 return __builtin_read8((void __iomem *)addr);
132 }
133
inw(unsigned long addr)134 static inline uint16_t inw(unsigned long addr)
135 {
136 uint16_t ret = __builtin_read16((void __iomem *)addr);
137
138 if (__is_PCI_IO(addr))
139 ret = _swapw(ret);
140
141 return ret;
142 }
143
inl(unsigned long addr)144 static inline uint32_t inl(unsigned long addr)
145 {
146 uint32_t ret = __builtin_read32((void __iomem *)addr);
147
148 if (__is_PCI_IO(addr))
149 ret = _swapl(ret);
150
151 return ret;
152 }
153
outb(uint8_t datum,unsigned long addr)154 static inline void outb(uint8_t datum, unsigned long addr)
155 {
156 __builtin_write8((void __iomem *)addr, datum);
157 }
158
outw(uint16_t datum,unsigned long addr)159 static inline void outw(uint16_t datum, unsigned long addr)
160 {
161 if (__is_PCI_IO(addr))
162 datum = _swapw(datum);
163 __builtin_write16((void __iomem *)addr, datum);
164 }
165
outl(uint32_t datum,unsigned long addr)166 static inline void outl(uint32_t datum, unsigned long addr)
167 {
168 if (__is_PCI_IO(addr))
169 datum = _swapl(datum);
170 __builtin_write32((void __iomem *)addr, datum);
171 }
172
173 #define inb_p(addr) inb(addr)
174 #define inw_p(addr) inw(addr)
175 #define inl_p(addr) inl(addr)
176 #define outb_p(x,addr) outb(x,addr)
177 #define outw_p(x,addr) outw(x,addr)
178 #define outl_p(x,addr) outl(x,addr)
179
180 #define outsb(a,b,l) io_outsb(a,b,l)
181 #define outsw(a,b,l) io_outsw(a,b,l)
182 #define outsl(a,b,l) __outsl(a,b,l,0)
183
184 #define insb(a,b,l) io_insb(a,b,l)
185 #define insw(a,b,l) io_insw(a,b,l)
186 #define insl(a,b,l) __insl(a,b,l,0)
187
188 #define IO_SPACE_LIMIT 0xffffffff
189
readb(const volatile void __iomem * addr)190 static inline uint8_t readb(const volatile void __iomem *addr)
191 {
192 return __builtin_read8((__force void volatile __iomem *) addr);
193 }
194
readw(const volatile void __iomem * addr)195 static inline uint16_t readw(const volatile void __iomem *addr)
196 {
197 uint16_t ret = __builtin_read16((__force void volatile __iomem *)addr);
198
199 if (__is_PCI_MEM(addr))
200 ret = _swapw(ret);
201 return ret;
202 }
203
readl(const volatile void __iomem * addr)204 static inline uint32_t readl(const volatile void __iomem *addr)
205 {
206 uint32_t ret = __builtin_read32((__force void volatile __iomem *)addr);
207
208 if (__is_PCI_MEM(addr))
209 ret = _swapl(ret);
210
211 return ret;
212 }
213
214 #define readb_relaxed readb
215 #define readw_relaxed readw
216 #define readl_relaxed readl
217
writeb(uint8_t datum,volatile void __iomem * addr)218 static inline void writeb(uint8_t datum, volatile void __iomem *addr)
219 {
220 __builtin_write8(addr, datum);
221 if (__is_PCI_MEM(addr))
222 __flush_PCI_writes();
223 }
224
writew(uint16_t datum,volatile void __iomem * addr)225 static inline void writew(uint16_t datum, volatile void __iomem *addr)
226 {
227 if (__is_PCI_MEM(addr))
228 datum = _swapw(datum);
229
230 __builtin_write16(addr, datum);
231 if (__is_PCI_MEM(addr))
232 __flush_PCI_writes();
233 }
234
writel(uint32_t datum,volatile void __iomem * addr)235 static inline void writel(uint32_t datum, volatile void __iomem *addr)
236 {
237 if (__is_PCI_MEM(addr))
238 datum = _swapl(datum);
239
240 __builtin_write32(addr, datum);
241 if (__is_PCI_MEM(addr))
242 __flush_PCI_writes();
243 }
244
245
246 /* Values for nocacheflag and cmode */
247 #define IOMAP_FULL_CACHING 0
248 #define IOMAP_NOCACHE_SER 1
249 #define IOMAP_NOCACHE_NONSER 2
250 #define IOMAP_WRITETHROUGH 3
251
252 extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
253
ioremap(unsigned long physaddr,unsigned long size)254 static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
255 {
256 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
257 }
258
ioremap_nocache(unsigned long physaddr,unsigned long size)259 static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
260 {
261 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
262 }
263
ioremap_writethrough(unsigned long physaddr,unsigned long size)264 static inline void __iomem *ioremap_writethrough(unsigned long physaddr, unsigned long size)
265 {
266 return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
267 }
268
ioremap_fullcache(unsigned long physaddr,unsigned long size)269 static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
270 {
271 return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
272 }
273
274 #define ioremap_wc ioremap_nocache
275
276 extern void iounmap(void volatile __iomem *addr);
277
ioport_map(unsigned long port,unsigned int nr)278 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
279 {
280 return (void __iomem *) port;
281 }
282
ioport_unmap(void __iomem * p)283 static inline void ioport_unmap(void __iomem *p)
284 {
285 }
286
flush_write_buffers(void)287 static inline void flush_write_buffers(void)
288 {
289 __asm__ __volatile__ ("membar" : : :"memory");
290 }
291
292 /*
293 * do appropriate I/O accesses for token type
294 */
ioread8(void __iomem * p)295 static inline unsigned int ioread8(void __iomem *p)
296 {
297 return __builtin_read8(p);
298 }
299
ioread16(void __iomem * p)300 static inline unsigned int ioread16(void __iomem *p)
301 {
302 uint16_t ret = __builtin_read16(p);
303 if (__is_PCI_addr(p))
304 ret = _swapw(ret);
305 return ret;
306 }
307
ioread32(void __iomem * p)308 static inline unsigned int ioread32(void __iomem *p)
309 {
310 uint32_t ret = __builtin_read32(p);
311 if (__is_PCI_addr(p))
312 ret = _swapl(ret);
313 return ret;
314 }
315
iowrite8(u8 val,void __iomem * p)316 static inline void iowrite8(u8 val, void __iomem *p)
317 {
318 __builtin_write8(p, val);
319 if (__is_PCI_MEM(p))
320 __flush_PCI_writes();
321 }
322
iowrite16(u16 val,void __iomem * p)323 static inline void iowrite16(u16 val, void __iomem *p)
324 {
325 if (__is_PCI_addr(p))
326 val = _swapw(val);
327 __builtin_write16(p, val);
328 if (__is_PCI_MEM(p))
329 __flush_PCI_writes();
330 }
331
iowrite32(u32 val,void __iomem * p)332 static inline void iowrite32(u32 val, void __iomem *p)
333 {
334 if (__is_PCI_addr(p))
335 val = _swapl(val);
336 __builtin_write32(p, val);
337 if (__is_PCI_MEM(p))
338 __flush_PCI_writes();
339 }
340
ioread8_rep(void __iomem * p,void * dst,unsigned long count)341 static inline void ioread8_rep(void __iomem *p, void *dst, unsigned long count)
342 {
343 io_insb((unsigned long) p, dst, count);
344 }
345
ioread16_rep(void __iomem * p,void * dst,unsigned long count)346 static inline void ioread16_rep(void __iomem *p, void *dst, unsigned long count)
347 {
348 io_insw((unsigned long) p, dst, count);
349 }
350
ioread32_rep(void __iomem * p,void * dst,unsigned long count)351 static inline void ioread32_rep(void __iomem *p, void *dst, unsigned long count)
352 {
353 __insl_ns((unsigned long) p, dst, count);
354 }
355
iowrite8_rep(void __iomem * p,const void * src,unsigned long count)356 static inline void iowrite8_rep(void __iomem *p, const void *src, unsigned long count)
357 {
358 io_outsb((unsigned long) p, src, count);
359 }
360
iowrite16_rep(void __iomem * p,const void * src,unsigned long count)361 static inline void iowrite16_rep(void __iomem *p, const void *src, unsigned long count)
362 {
363 io_outsw((unsigned long) p, src, count);
364 }
365
iowrite32_rep(void __iomem * p,const void * src,unsigned long count)366 static inline void iowrite32_rep(void __iomem *p, const void *src, unsigned long count)
367 {
368 __outsl_ns((unsigned long) p, src, count);
369 }
370
371 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
372 struct pci_dev;
373 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
pci_iounmap(struct pci_dev * dev,void __iomem * p)374 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
375 {
376 }
377
378
379 /*
380 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
381 * access
382 */
383 #define xlate_dev_mem_ptr(p) __va(p)
384
385 /*
386 * Convert a virtual cached pointer to an uncached pointer
387 */
388 #define xlate_dev_kmem_ptr(p) p
389
390 #endif /* __KERNEL__ */
391
392 #endif /* _ASM_IO_H */
393