/arch/mn10300/include/asm/io.h

  1/* MN10300 I/O port emulation and memory-mapped I/O
  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_IO_H
 12#define _ASM_IO_H
 13
 14#include <asm/page.h> /* I/O is all done through memory accesses */
 15#include <asm/cpu-regs.h>
 16#include <asm/cacheflush.h>
 17
 18#define mmiowb() do {} while (0)
 19
 20/*****************************************************************************/
 21/*
 22 * readX/writeX() are used to access memory mapped devices. On some
 23 * architectures the memory mapped IO stuff needs to be accessed
 24 * differently. On the x86 architecture, we just read/write the
 25 * memory location directly.
 26 */
 27static inline u8 readb(const volatile void __iomem *addr)
 28{
 29	return *(const volatile u8 *) addr;
 30}
 31
 32static inline u16 readw(const volatile void __iomem *addr)
 33{
 34	return *(const volatile u16 *) addr;
 35}
 36
 37static inline u32 readl(const volatile void __iomem *addr)
 38{
 39	return *(const volatile u32 *) addr;
 40}
 41
 42#define __raw_readb readb
 43#define __raw_readw readw
 44#define __raw_readl readl
 45
 46#define readb_relaxed readb
 47#define readw_relaxed readw
 48#define readl_relaxed readl
 49
 50static inline void writeb(u8 b, volatile void __iomem *addr)
 51{
 52	*(volatile u8 *) addr = b;
 53}
 54
 55static inline void writew(u16 b, volatile void __iomem *addr)
 56{
 57	*(volatile u16 *) addr = b;
 58}
 59
 60static inline void writel(u32 b, volatile void __iomem *addr)
 61{
 62	*(volatile u32 *) addr = b;
 63}
 64
 65#define __raw_writeb writeb
 66#define __raw_writew writew
 67#define __raw_writel writel
 68
 69/*****************************************************************************/
 70/*
 71 * traditional input/output functions
 72 */
 73static inline u8 inb_local(unsigned long addr)
 74{
 75	return readb((volatile void __iomem *) addr);
 76}
 77
 78static inline void outb_local(u8 b, unsigned long addr)
 79{
 80	return writeb(b, (volatile void __iomem *) addr);
 81}
 82
 83static inline u8 inb(unsigned long addr)
 84{
 85	return readb((volatile void __iomem *) addr);
 86}
 87
 88static inline u16 inw(unsigned long addr)
 89{
 90	return readw((volatile void __iomem *) addr);
 91}
 92
 93static inline u32 inl(unsigned long addr)
 94{
 95	return readl((volatile void __iomem *) addr);
 96}
 97
 98static inline void outb(u8 b, unsigned long addr)
 99{
100	return writeb(b, (volatile void __iomem *) addr);
101}
102
103static inline void outw(u16 b, unsigned long addr)
104{
105	return writew(b, (volatile void __iomem *) addr);
106}
107
108static inline void outl(u32 b, unsigned long addr)
109{
110	return writel(b, (volatile void __iomem *) addr);
111}
112
113#define inb_p(addr)	inb(addr)
114#define inw_p(addr)	inw(addr)
115#define inl_p(addr)	inl(addr)
116#define outb_p(x, addr)	outb((x), (addr))
117#define outw_p(x, addr)	outw((x), (addr))
118#define outl_p(x, addr)	outl((x), (addr))
119
120static inline void insb(unsigned long addr, void *buffer, int count)
121{
122	if (count) {
123		u8 *buf = buffer;
124		do {
125			u8 x = inb(addr);
126			*buf++ = x;
127		} while (--count);
128	}
129}
130
131static inline void insw(unsigned long addr, void *buffer, int count)
132{
133	if (count) {
134		u16 *buf = buffer;
135		do {
136			u16 x = inw(addr);
137			*buf++ = x;
138		} while (--count);
139	}
140}
141
142static inline void insl(unsigned long addr, void *buffer, int count)
143{
144	if (count) {
145		u32 *buf = buffer;
146		do {
147			u32 x = inl(addr);
148			*buf++ = x;
149		} while (--count);
150	}
151}
152
153static inline void outsb(unsigned long addr, const void *buffer, int count)
154{
155	if (count) {
156		const u8 *buf = buffer;
157		do {
158			outb(*buf++, addr);
159		} while (--count);
160	}
161}
162
163static inline void outsw(unsigned long addr, const void *buffer, int count)
164{
165	if (count) {
166		const u16 *buf = buffer;
167		do {
168			outw(*buf++, addr);
169		} while (--count);
170	}
171}
172
173extern void __outsl(unsigned long addr, const void *buffer, int count);
174static inline void outsl(unsigned long addr, const void *buffer, int count)
175{
176	if ((unsigned long) buffer & 0x3)
177		return __outsl(addr, buffer, count);
178
179	if (count) {
180		const u32 *buf = buffer;
181		do {
182			outl(*buf++, addr);
183		} while (--count);
184	}
185}
186
187#define ioread8(addr)		readb(addr)
188#define ioread16(addr)		readw(addr)
189#define ioread32(addr)		readl(addr)
190
191#define iowrite8(v, addr)	writeb((v), (addr))
192#define iowrite16(v, addr)	writew((v), (addr))
193#define iowrite32(v, addr)	writel((v), (addr))
194
195#define ioread8_rep(p, dst, count) \
196	insb((unsigned long) (p), (dst), (count))
197#define ioread16_rep(p, dst, count) \
198	insw((unsigned long) (p), (dst), (count))
199#define ioread32_rep(p, dst, count) \
200	insl((unsigned long) (p), (dst), (count))
201
202#define iowrite8_rep(p, src, count) \
203	outsb((unsigned long) (p), (src), (count))
204#define iowrite16_rep(p, src, count) \
205	outsw((unsigned long) (p), (src), (count))
206#define iowrite32_rep(p, src, count) \
207	outsl((unsigned long) (p), (src), (count))
208
209
210#define IO_SPACE_LIMIT 0xffffffff
211
212#ifdef __KERNEL__
213
214#include <linux/vmalloc.h>
215#define __io_virt(x) ((void *) (x))
216
217/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
218struct pci_dev;
219extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
220static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
221{
222}
223
224/*
225 * Change virtual addresses to physical addresses and vv.
226 * These are pretty trivial
227 */
228static inline unsigned long virt_to_phys(volatile void *address)
229{
230	return __pa(address);
231}
232
233static inline void *phys_to_virt(unsigned long address)
234{
235	return __va(address);
236}
237
238/*
239 * Change "struct page" to physical address.
240 */
241static inline void *__ioremap(unsigned long offset, unsigned long size,
242			      unsigned long flags)
243{
244	return (void *) offset;
245}
246
247static inline void *ioremap(unsigned long offset, unsigned long size)
248{
249	return (void *) offset;
250}
251
252/*
253 * This one maps high address device memory and turns off caching for that
254 * area.  it's useful if some control registers are in such an area and write
255 * combining or read caching is not desirable:
256 */
257static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
258{
259	return (void *) (offset | 0x20000000);
260}
261
262#define ioremap_wc ioremap_nocache
263
264static inline void iounmap(void *addr)
265{
266}
267
268static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
269{
270	return (void __iomem *) port;
271}
272
273static inline void ioport_unmap(void __iomem *p)
274{
275}
276
277#define xlate_dev_kmem_ptr(p)	((void *) (p))
278#define xlate_dev_mem_ptr(p)	((void *) (p))
279
280/*
281 * PCI bus iomem addresses must be in the region 0x80000000-0x9fffffff
282 */
283static inline unsigned long virt_to_bus(volatile void *address)
284{
285	return ((unsigned long) address) & ~0x20000000;
286}
287
288static inline void *bus_to_virt(unsigned long address)
289{
290	return (void *) address;
291}
292
293#define page_to_bus page_to_phys
294
295#define memset_io(a, b, c)	memset(__io_virt(a), (b), (c))
296#define memcpy_fromio(a, b, c)	memcpy((a), __io_virt(b), (c))
297#define memcpy_toio(a, b, c)	memcpy(__io_virt(a), (b), (c))
298
299#endif /* __KERNEL__ */
300
301#endif /* _ASM_IO_H */