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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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/config.h>
David Howellsa90a72c2006-01-08 01:01:20 -080021#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <asm/virtconvert.h>
23#include <asm/string.h>
24#include <asm/mb-regs.h>
25#include <linux/delay.h>
26
27/*
28 * swap functions are sometimes needed to interface little-endian hardware
29 */
30
31static inline unsigned short _swapw(unsigned short v)
32{
33 return ((v << 8) | (v >> 8));
34}
35
36static inline unsigned long _swapl(unsigned long v)
37{
38 return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
39}
40
41//#define __iormb() asm volatile("membar")
42//#define __iowmb() asm volatile("membar")
43
44#define __raw_readb(addr) __builtin_read8((void *) (addr))
45#define __raw_readw(addr) __builtin_read16((void *) (addr))
46#define __raw_readl(addr) __builtin_read32((void *) (addr))
47
48#define __raw_writeb(datum, addr) __builtin_write8((void *) (addr), datum)
49#define __raw_writew(datum, addr) __builtin_write16((void *) (addr), datum)
50#define __raw_writel(datum, addr) __builtin_write32((void *) (addr), datum)
51
52static inline void io_outsb(unsigned int addr, const void *buf, int len)
53{
54 unsigned long __ioaddr = (unsigned long) addr;
55 const uint8_t *bp = buf;
56
57 while (len--)
58 __builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
59}
60
61static inline void io_outsw(unsigned int addr, const void *buf, int len)
62{
63 unsigned long __ioaddr = (unsigned long) addr;
64 const uint16_t *bp = buf;
65
66 while (len--)
67 __builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
68}
69
70extern void __outsl_ns(unsigned int addr, const void *buf, int len);
71extern void __outsl_sw(unsigned int addr, const void *buf, int len);
72static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
73{
74 unsigned long __ioaddr = (unsigned long) addr;
75
76 if (!swap)
77 __outsl_ns(__ioaddr, buf, len);
78 else
79 __outsl_sw(__ioaddr, buf, len);
80}
81
82static inline void io_insb(unsigned long addr, void *buf, int len)
83{
84 uint8_t *bp = buf;
85
86 while (len--)
87 *bp++ = __builtin_read8((volatile void __iomem *) addr);
88}
89
90static inline void io_insw(unsigned long addr, void *buf, int len)
91{
92 uint16_t *bp = buf;
93
94 while (len--)
95 *bp++ = __builtin_read16((volatile void __iomem *) addr);
96}
97
98extern void __insl_ns(unsigned long addr, void *buf, int len);
99extern void __insl_sw(unsigned long addr, void *buf, int len);
100static inline void __insl(unsigned long addr, void *buf, int len, int swap)
101{
102 if (!swap)
103 __insl_ns(addr, buf, len);
104 else
105 __insl_sw(addr, buf, len);
106}
107
David Howellsa90a72c2006-01-08 01:01:20 -0800108#define mmiowb() mb()
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110/*
111 * make the short names macros so specific devices
112 * can override them as required
113 */
114
115static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
116{
117 memset((void __force *) addr, val, count);
118}
119
120static inline void memcpy_fromio(void *dst, volatile void __iomem *src, int count)
121{
122 memcpy(dst, (void __force *) src, count);
123}
124
125static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
126{
127 memcpy((void __force *) dst, src, count);
128}
129
130static inline uint8_t inb(unsigned long addr)
131{
132 return __builtin_read8((void *)addr);
133}
134
135static inline uint16_t inw(unsigned long addr)
136{
137 uint16_t ret = __builtin_read16((void *)addr);
138
139 if (__is_PCI_IO(addr))
140 ret = _swapw(ret);
141
142 return ret;
143}
144
145static inline uint32_t inl(unsigned long addr)
146{
147 uint32_t ret = __builtin_read32((void *)addr);
148
149 if (__is_PCI_IO(addr))
150 ret = _swapl(ret);
151
152 return ret;
153}
154
155static inline void outb(uint8_t datum, unsigned long addr)
156{
157 __builtin_write8((void *)addr, datum);
158}
159
160static inline void outw(uint16_t datum, unsigned long addr)
161{
162 if (__is_PCI_IO(addr))
163 datum = _swapw(datum);
164 __builtin_write16((void *)addr, datum);
165}
166
167static inline void outl(uint32_t datum, unsigned long addr)
168{
169 if (__is_PCI_IO(addr))
170 datum = _swapl(datum);
171 __builtin_write32((void *)addr, datum);
172}
173
174#define inb_p(addr) inb(addr)
175#define inw_p(addr) inw(addr)
176#define inl_p(addr) inl(addr)
177#define outb_p(x,addr) outb(x,addr)
178#define outw_p(x,addr) outw(x,addr)
179#define outl_p(x,addr) outl(x,addr)
180
181#define outsb(a,b,l) io_outsb(a,b,l)
182#define outsw(a,b,l) io_outsw(a,b,l)
183#define outsl(a,b,l) __outsl(a,b,l,0)
184
185#define insb(a,b,l) io_insb(a,b,l)
186#define insw(a,b,l) io_insw(a,b,l)
187#define insl(a,b,l) __insl(a,b,l,0)
188
189#define IO_SPACE_LIMIT 0xffffffff
190
191static inline uint8_t readb(const volatile void __iomem *addr)
192{
193 return __builtin_read8((volatile uint8_t __force *) addr);
194}
195
196static inline uint16_t readw(const volatile void __iomem *addr)
197{
198 uint16_t ret = __builtin_read16((volatile uint16_t __force *)addr);
199
200 if (__is_PCI_MEM(addr))
201 ret = _swapw(ret);
202 return ret;
203}
204
205static inline uint32_t readl(const volatile void __iomem *addr)
206{
207 uint32_t ret = __builtin_read32((volatile uint32_t __force *)addr);
208
209 if (__is_PCI_MEM(addr))
210 ret = _swapl(ret);
211
212 return ret;
213}
214
David Howellsa90a72c2006-01-08 01:01:20 -0800215#define readb_relaxed readb
216#define readw_relaxed readw
217#define readl_relaxed readl
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219static inline void writeb(uint8_t datum, volatile void __iomem *addr)
220{
221 __builtin_write8((volatile uint8_t __force *) addr, datum);
222 if (__is_PCI_MEM(addr))
223 __flush_PCI_writes();
224}
225
226static inline void writew(uint16_t datum, volatile void __iomem *addr)
227{
228 if (__is_PCI_MEM(addr))
229 datum = _swapw(datum);
230
231 __builtin_write16((volatile uint16_t __force *) addr, datum);
232 if (__is_PCI_MEM(addr))
233 __flush_PCI_writes();
234}
235
236static inline void writel(uint32_t datum, volatile void __iomem *addr)
237{
238 if (__is_PCI_MEM(addr))
239 datum = _swapl(datum);
240
241 __builtin_write32((volatile uint32_t __force *) addr, datum);
242 if (__is_PCI_MEM(addr))
243 __flush_PCI_writes();
244}
245
246
247/* Values for nocacheflag and cmode */
248#define IOMAP_FULL_CACHING 0
249#define IOMAP_NOCACHE_SER 1
250#define IOMAP_NOCACHE_NONSER 2
251#define IOMAP_WRITETHROUGH 3
252
253extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
254extern void __iounmap(void __iomem *addr, unsigned long size);
255
256static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
257{
258 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
259}
260
261static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
262{
263 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
264}
265
266static inline void __iomem *ioremap_writethrough(unsigned long physaddr, unsigned long size)
267{
268 return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
269}
270
271static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
272{
273 return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
274}
275
276extern void iounmap(void __iomem *addr);
277
David Howellsa90a72c2006-01-08 01:01:20 -0800278static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
279{
280 return (void __iomem *) port;
281}
282
283static inline void ioport_unmap(void __iomem *p)
284{
285}
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287static inline void flush_write_buffers(void)
288{
289 __asm__ __volatile__ ("membar" : : :"memory");
290}
291
David Howellsa90a72c2006-01-08 01:01:20 -0800292/*
293 * do appropriate I/O accesses for token type
294 */
295static inline unsigned int ioread8(void __iomem *p)
296{
297 return __builtin_read8(p);
298}
299
300static 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
308static 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
316static 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
323static 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
332static 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
341static inline void ioread8_rep(void __iomem *p, void *dst, unsigned long count)
342{
343 io_insb((unsigned long) p, dst, count);
344}
345
346static inline void ioread16_rep(void __iomem *p, void *dst, unsigned long count)
347{
348 io_insw((unsigned long) p, dst, count);
349}
350
351static inline void ioread32_rep(void __iomem *p, void *dst, unsigned long count)
352{
353 __insl_ns((unsigned long) p, dst, count);
354}
355
356static inline void iowrite8_rep(void __iomem *p, const void *src, unsigned long count)
357{
358 io_outsb((unsigned long) p, src, count);
359}
360
361static inline void iowrite16_rep(void __iomem *p, const void *src, unsigned long count)
362{
363 io_outsw((unsigned long) p, src, count);
364}
365
366static 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) */
372struct pci_dev;
373extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
374static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
375{
376}
377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
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
David Howellsa90a72c2006-01-08 01:01:20 -0800390/*
391 * Check BIOS signature
392 */
393static inline int check_signature(volatile void __iomem *io_addr,
394 const unsigned char *signature, int length)
395{
396 int retval = 0;
397
398 do {
399 if (readb(io_addr) != *signature)
400 goto out;
401 io_addr++;
402 signature++;
403 length--;
404 } while (length);
405
406 retval = 1;
407out:
408 return retval;
409}
410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411#endif /* __KERNEL__ */
412
413#endif /* _ASM_IO_H */