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
30static inline unsigned short _swapw(unsigned short v)
31{
32    return ((v << 8) | (v >> 8));
33}
34
35static 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
51static 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
60static 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
69extern void __outsl_ns(unsigned int addr, const void *buf, int len);
70extern void __outsl_sw(unsigned int addr, const void *buf, int len);
71static 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
81static 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
89static 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
97extern void __insl_ns(unsigned long addr, void *buf, int len);
98extern void __insl_sw(unsigned long addr, void *buf, int len);
99static 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
114static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
115{
116	memset((void __force *) addr, val, count);
117}
118
119static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
120{
121	memcpy(dst, (void __force *) src, count);
122}
123
124static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
125{
126	memcpy((void __force *) dst, src, count);
127}
128
129static inline uint8_t inb(unsigned long addr)
130{
131	return __builtin_read8((void __iomem *)addr);
132}
133
134static 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
144static 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
154static inline void outb(uint8_t datum, unsigned long addr)
155{
156	__builtin_write8((void __iomem *)addr, datum);
157}
158
159static 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
166static 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
190static inline uint8_t readb(const volatile void __iomem *addr)
191{
192	return __builtin_read8((__force void volatile __iomem *) addr);
193}
194
195static 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
204static 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
218static 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
225static 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
235static 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
252extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
253
254static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
255{
256	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
257}
258
259static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
260{
261	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
262}
263
264static inline void __iomem *ioremap_writethrough(unsigned long physaddr, unsigned long size)
265{
266	return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
267}
268
269static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
270{
271	return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
272}
273
274extern void iounmap(void volatile __iomem *addr);
275
276static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
277{
278	return (void __iomem *) port;
279}
280
281static inline void ioport_unmap(void __iomem *p)
282{
283}
284
285static inline void flush_write_buffers(void)
286{
287	__asm__ __volatile__ ("membar" : : :"memory");
288}
289
290/*
291 * do appropriate I/O accesses for token type
292 */
293static inline unsigned int ioread8(void __iomem *p)
294{
295	return __builtin_read8(p);
296}
297
298static inline unsigned int ioread16(void __iomem *p)
299{
300	uint16_t ret = __builtin_read16(p);
301	if (__is_PCI_addr(p))
302		ret = _swapw(ret);
303	return ret;
304}
305
306static inline unsigned int ioread32(void __iomem *p)
307{
308	uint32_t ret = __builtin_read32(p);
309	if (__is_PCI_addr(p))
310		ret = _swapl(ret);
311	return ret;
312}
313
314static inline void iowrite8(u8 val, void __iomem *p)
315{
316	__builtin_write8(p, val);
317	if (__is_PCI_MEM(p))
318		__flush_PCI_writes();
319}
320
321static inline void iowrite16(u16 val, void __iomem *p)
322{
323	if (__is_PCI_addr(p))
324		val = _swapw(val);
325	__builtin_write16(p, val);
326	if (__is_PCI_MEM(p))
327		__flush_PCI_writes();
328}
329
330static inline void iowrite32(u32 val, void __iomem *p)
331{
332	if (__is_PCI_addr(p))
333		val = _swapl(val);
334	__builtin_write32(p, val);
335	if (__is_PCI_MEM(p))
336		__flush_PCI_writes();
337}
338
339static inline void ioread8_rep(void __iomem *p, void *dst, unsigned long count)
340{
341	io_insb((unsigned long) p, dst, count);
342}
343
344static inline void ioread16_rep(void __iomem *p, void *dst, unsigned long count)
345{
346	io_insw((unsigned long) p, dst, count);
347}
348
349static inline void ioread32_rep(void __iomem *p, void *dst, unsigned long count)
350{
351	__insl_ns((unsigned long) p, dst, count);
352}
353
354static inline void iowrite8_rep(void __iomem *p, const void *src, unsigned long count)
355{
356	io_outsb((unsigned long) p, src, count);
357}
358
359static inline void iowrite16_rep(void __iomem *p, const void *src, unsigned long count)
360{
361	io_outsw((unsigned long) p, src, count);
362}
363
364static inline void iowrite32_rep(void __iomem *p, const void *src, unsigned long count)
365{
366	__outsl_ns((unsigned long) p, src, count);
367}
368
369/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
370struct pci_dev;
371extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
372static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
373{
374}
375
376
377/*
378 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
379 * access
380 */
381#define xlate_dev_mem_ptr(p)	__va(p)
382
383/*
384 * Convert a virtual cached pointer to an uncached pointer
385 */
386#define xlate_dev_kmem_ptr(p)	p
387
388#endif /* __KERNEL__ */
389
390#endif /* _ASM_IO_H */
391